1989d42e8SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * drivers/base/core.c - core driver model code (device registration, etc) 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (c) 2002-3 Patrick Mochel 61da177e4SLinus Torvalds * Copyright (c) 2002-3 Open Source Development Labs 764bb5d2cSGreg Kroah-Hartman * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> 864bb5d2cSGreg Kroah-Hartman * Copyright (c) 2006 Novell, Inc. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 117847a145SHeikki Krogerus #include <linux/acpi.h> 1265650b35SRafael J. Wysocki #include <linux/cpufreq.h> 131da177e4SLinus Torvalds #include <linux/device.h> 141da177e4SLinus Torvalds #include <linux/err.h> 1597badf87SRafael J. Wysocki #include <linux/fwnode.h> 161da177e4SLinus Torvalds #include <linux/init.h> 171da177e4SLinus Torvalds #include <linux/module.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/string.h> 2023681e47SGreg Kroah-Hartman #include <linux/kdev_t.h> 21116af378SBenjamin Herrenschmidt #include <linux/notifier.h> 2207d57a32SGrant Likely #include <linux/of.h> 2307d57a32SGrant Likely #include <linux/of_device.h> 24da231fd5SKay Sievers #include <linux/genhd.h> 25f75b1c60SDave Young #include <linux/mutex.h> 26af8db150SPeter Chen #include <linux/pm_runtime.h> 27c4e00daaSKay Sievers #include <linux/netdevice.h> 28174cd4b1SIngo Molnar #include <linux/sched/signal.h> 29b8530017SOliver Neukum #include <linux/sched/mm.h> 3063967685SGreg Kroah-Hartman #include <linux/sysfs.h> 316d4e9a8eSChristoph Hellwig #include <linux/dma-map-ops.h> /* for dma_default_coherent */ 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds #include "base.h" 341da177e4SLinus Torvalds #include "power/power.h" 351da177e4SLinus Torvalds 36e52eec13SAndi Kleen #ifdef CONFIG_SYSFS_DEPRECATED 37e52eec13SAndi Kleen #ifdef CONFIG_SYSFS_DEPRECATED_V2 38e52eec13SAndi Kleen long sysfs_deprecated = 1; 39e52eec13SAndi Kleen #else 40e52eec13SAndi Kleen long sysfs_deprecated = 0; 41e52eec13SAndi Kleen #endif 423454bf96SHanjun Guo static int __init sysfs_deprecated_setup(char *arg) 43e52eec13SAndi Kleen { 4434da5e67SJingoo Han return kstrtol(arg, 10, &sysfs_deprecated); 45e52eec13SAndi Kleen } 46e52eec13SAndi Kleen early_param("sysfs.deprecated", sysfs_deprecated_setup); 47e52eec13SAndi Kleen #endif 48e52eec13SAndi Kleen 499ed98953SRafael J. Wysocki /* Device links support. */ 50fc5a251dSSaravana Kannan static LIST_HEAD(deferred_sync); 51fc5a251dSSaravana Kannan static unsigned int defer_sync_state_count = 1; 527b337cb3SSaravana Kannan static DEFINE_MUTEX(fwnode_link_lock); 5325ac86c6SSaravana Kannan static bool fw_devlink_is_permissive(void); 54d46f3e3eSSaravana Kannan static bool fw_devlink_drv_reg_done; 557b337cb3SSaravana Kannan 567b337cb3SSaravana Kannan /** 577b337cb3SSaravana Kannan * fwnode_link_add - Create a link between two fwnode_handles. 587b337cb3SSaravana Kannan * @con: Consumer end of the link. 597b337cb3SSaravana Kannan * @sup: Supplier end of the link. 607b337cb3SSaravana Kannan * 617b337cb3SSaravana Kannan * Create a fwnode link between fwnode handles @con and @sup. The fwnode link 627b337cb3SSaravana Kannan * represents the detail that the firmware lists @sup fwnode as supplying a 637b337cb3SSaravana Kannan * resource to @con. 647b337cb3SSaravana Kannan * 657b337cb3SSaravana Kannan * The driver core will use the fwnode link to create a device link between the 667b337cb3SSaravana Kannan * two device objects corresponding to @con and @sup when they are created. The 677b337cb3SSaravana Kannan * driver core will automatically delete the fwnode link between @con and @sup 687b337cb3SSaravana Kannan * after doing that. 697b337cb3SSaravana Kannan * 707b337cb3SSaravana Kannan * Attempts to create duplicate links between the same pair of fwnode handles 717b337cb3SSaravana Kannan * are ignored and there is no reference counting. 727b337cb3SSaravana Kannan */ 737b337cb3SSaravana Kannan int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup) 747b337cb3SSaravana Kannan { 757b337cb3SSaravana Kannan struct fwnode_link *link; 767b337cb3SSaravana Kannan int ret = 0; 777b337cb3SSaravana Kannan 787b337cb3SSaravana Kannan mutex_lock(&fwnode_link_lock); 797b337cb3SSaravana Kannan 807b337cb3SSaravana Kannan list_for_each_entry(link, &sup->consumers, s_hook) 817b337cb3SSaravana Kannan if (link->consumer == con) 827b337cb3SSaravana Kannan goto out; 837b337cb3SSaravana Kannan 847b337cb3SSaravana Kannan link = kzalloc(sizeof(*link), GFP_KERNEL); 857b337cb3SSaravana Kannan if (!link) { 867b337cb3SSaravana Kannan ret = -ENOMEM; 877b337cb3SSaravana Kannan goto out; 887b337cb3SSaravana Kannan } 897b337cb3SSaravana Kannan 907b337cb3SSaravana Kannan link->supplier = sup; 917b337cb3SSaravana Kannan INIT_LIST_HEAD(&link->s_hook); 927b337cb3SSaravana Kannan link->consumer = con; 937b337cb3SSaravana Kannan INIT_LIST_HEAD(&link->c_hook); 947b337cb3SSaravana Kannan 957b337cb3SSaravana Kannan list_add(&link->s_hook, &sup->consumers); 967b337cb3SSaravana Kannan list_add(&link->c_hook, &con->suppliers); 977b337cb3SSaravana Kannan out: 987b337cb3SSaravana Kannan mutex_unlock(&fwnode_link_lock); 997b337cb3SSaravana Kannan 1007b337cb3SSaravana Kannan return ret; 1017b337cb3SSaravana Kannan } 1027b337cb3SSaravana Kannan 1037b337cb3SSaravana Kannan /** 1047b337cb3SSaravana Kannan * fwnode_links_purge_suppliers - Delete all supplier links of fwnode_handle. 1057b337cb3SSaravana Kannan * @fwnode: fwnode whose supplier links need to be deleted 1067b337cb3SSaravana Kannan * 1077b337cb3SSaravana Kannan * Deletes all supplier links connecting directly to @fwnode. 1087b337cb3SSaravana Kannan */ 1097b337cb3SSaravana Kannan static void fwnode_links_purge_suppliers(struct fwnode_handle *fwnode) 1107b337cb3SSaravana Kannan { 1117b337cb3SSaravana Kannan struct fwnode_link *link, *tmp; 1127b337cb3SSaravana Kannan 1137b337cb3SSaravana Kannan mutex_lock(&fwnode_link_lock); 1147b337cb3SSaravana Kannan list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) { 1157b337cb3SSaravana Kannan list_del(&link->s_hook); 1167b337cb3SSaravana Kannan list_del(&link->c_hook); 1177b337cb3SSaravana Kannan kfree(link); 1187b337cb3SSaravana Kannan } 1197b337cb3SSaravana Kannan mutex_unlock(&fwnode_link_lock); 1207b337cb3SSaravana Kannan } 1217b337cb3SSaravana Kannan 1227b337cb3SSaravana Kannan /** 1237b337cb3SSaravana Kannan * fwnode_links_purge_consumers - Delete all consumer links of fwnode_handle. 1247b337cb3SSaravana Kannan * @fwnode: fwnode whose consumer links need to be deleted 1257b337cb3SSaravana Kannan * 1267b337cb3SSaravana Kannan * Deletes all consumer links connecting directly to @fwnode. 1277b337cb3SSaravana Kannan */ 1287b337cb3SSaravana Kannan static void fwnode_links_purge_consumers(struct fwnode_handle *fwnode) 1297b337cb3SSaravana Kannan { 1307b337cb3SSaravana Kannan struct fwnode_link *link, *tmp; 1317b337cb3SSaravana Kannan 1327b337cb3SSaravana Kannan mutex_lock(&fwnode_link_lock); 1337b337cb3SSaravana Kannan list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) { 1347b337cb3SSaravana Kannan list_del(&link->s_hook); 1357b337cb3SSaravana Kannan list_del(&link->c_hook); 1367b337cb3SSaravana Kannan kfree(link); 1377b337cb3SSaravana Kannan } 1387b337cb3SSaravana Kannan mutex_unlock(&fwnode_link_lock); 1397b337cb3SSaravana Kannan } 1407b337cb3SSaravana Kannan 1417b337cb3SSaravana Kannan /** 1427b337cb3SSaravana Kannan * fwnode_links_purge - Delete all links connected to a fwnode_handle. 1437b337cb3SSaravana Kannan * @fwnode: fwnode whose links needs to be deleted 1447b337cb3SSaravana Kannan * 1457b337cb3SSaravana Kannan * Deletes all links connecting directly to a fwnode. 1467b337cb3SSaravana Kannan */ 1477b337cb3SSaravana Kannan void fwnode_links_purge(struct fwnode_handle *fwnode) 1487b337cb3SSaravana Kannan { 1497b337cb3SSaravana Kannan fwnode_links_purge_suppliers(fwnode); 1507b337cb3SSaravana Kannan fwnode_links_purge_consumers(fwnode); 1517b337cb3SSaravana Kannan } 1529ed98953SRafael J. Wysocki 15328ec344bSSaravana Kannan void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode) 1549528e0d9SSaravana Kannan { 1559528e0d9SSaravana Kannan struct fwnode_handle *child; 1569528e0d9SSaravana Kannan 1579528e0d9SSaravana Kannan /* Don't purge consumer links of an added child */ 1589528e0d9SSaravana Kannan if (fwnode->dev) 1599528e0d9SSaravana Kannan return; 1609528e0d9SSaravana Kannan 1619528e0d9SSaravana Kannan fwnode->flags |= FWNODE_FLAG_NOT_DEVICE; 1629528e0d9SSaravana Kannan fwnode_links_purge_consumers(fwnode); 1639528e0d9SSaravana Kannan 1649528e0d9SSaravana Kannan fwnode_for_each_available_child_node(fwnode, child) 1659528e0d9SSaravana Kannan fw_devlink_purge_absent_suppliers(child); 1669528e0d9SSaravana Kannan } 16728ec344bSSaravana Kannan EXPORT_SYMBOL_GPL(fw_devlink_purge_absent_suppliers); 1689528e0d9SSaravana Kannan 1699ed98953SRafael J. Wysocki #ifdef CONFIG_SRCU 1709ed98953SRafael J. Wysocki static DEFINE_MUTEX(device_links_lock); 1719ed98953SRafael J. Wysocki DEFINE_STATIC_SRCU(device_links_srcu); 1729ed98953SRafael J. Wysocki 1739ed98953SRafael J. Wysocki static inline void device_links_write_lock(void) 1749ed98953SRafael J. Wysocki { 1759ed98953SRafael J. Wysocki mutex_lock(&device_links_lock); 1769ed98953SRafael J. Wysocki } 1779ed98953SRafael J. Wysocki 1789ed98953SRafael J. Wysocki static inline void device_links_write_unlock(void) 1799ed98953SRafael J. Wysocki { 1809ed98953SRafael J. Wysocki mutex_unlock(&device_links_lock); 1819ed98953SRafael J. Wysocki } 1829ed98953SRafael J. Wysocki 18368464d79SJules Irenge int device_links_read_lock(void) __acquires(&device_links_srcu) 1849ed98953SRafael J. Wysocki { 1859ed98953SRafael J. Wysocki return srcu_read_lock(&device_links_srcu); 1869ed98953SRafael J. Wysocki } 1879ed98953SRafael J. Wysocki 188ab7789c5SJules Irenge void device_links_read_unlock(int idx) __releases(&device_links_srcu) 1899ed98953SRafael J. Wysocki { 1909ed98953SRafael J. Wysocki srcu_read_unlock(&device_links_srcu, idx); 1919ed98953SRafael J. Wysocki } 192c2fa1e1bSJoel Fernandes (Google) 193c2fa1e1bSJoel Fernandes (Google) int device_links_read_lock_held(void) 194c2fa1e1bSJoel Fernandes (Google) { 195c2fa1e1bSJoel Fernandes (Google) return srcu_read_lock_held(&device_links_srcu); 196c2fa1e1bSJoel Fernandes (Google) } 19780dd33cfSRafael J. Wysocki 19880dd33cfSRafael J. Wysocki static void device_link_synchronize_removal(void) 19980dd33cfSRafael J. Wysocki { 20080dd33cfSRafael J. Wysocki synchronize_srcu(&device_links_srcu); 20180dd33cfSRafael J. Wysocki } 2020c871315SRafael J. Wysocki 2030c871315SRafael J. Wysocki static void device_link_remove_from_lists(struct device_link *link) 2040c871315SRafael J. Wysocki { 2050c871315SRafael J. Wysocki list_del_rcu(&link->s_node); 2060c871315SRafael J. Wysocki list_del_rcu(&link->c_node); 2070c871315SRafael J. Wysocki } 2089ed98953SRafael J. Wysocki #else /* !CONFIG_SRCU */ 2099ed98953SRafael J. Wysocki static DECLARE_RWSEM(device_links_lock); 2109ed98953SRafael J. Wysocki 2119ed98953SRafael J. Wysocki static inline void device_links_write_lock(void) 2129ed98953SRafael J. Wysocki { 2139ed98953SRafael J. Wysocki down_write(&device_links_lock); 2149ed98953SRafael J. Wysocki } 2159ed98953SRafael J. Wysocki 2169ed98953SRafael J. Wysocki static inline void device_links_write_unlock(void) 2179ed98953SRafael J. Wysocki { 2189ed98953SRafael J. Wysocki up_write(&device_links_lock); 2199ed98953SRafael J. Wysocki } 2209ed98953SRafael J. Wysocki 2219ed98953SRafael J. Wysocki int device_links_read_lock(void) 2229ed98953SRafael J. Wysocki { 2239ed98953SRafael J. Wysocki down_read(&device_links_lock); 2249ed98953SRafael J. Wysocki return 0; 2259ed98953SRafael J. Wysocki } 2269ed98953SRafael J. Wysocki 2279ed98953SRafael J. Wysocki void device_links_read_unlock(int not_used) 2289ed98953SRafael J. Wysocki { 2299ed98953SRafael J. Wysocki up_read(&device_links_lock); 2309ed98953SRafael J. Wysocki } 231c2fa1e1bSJoel Fernandes (Google) 232c2fa1e1bSJoel Fernandes (Google) #ifdef CONFIG_DEBUG_LOCK_ALLOC 233c2fa1e1bSJoel Fernandes (Google) int device_links_read_lock_held(void) 234c2fa1e1bSJoel Fernandes (Google) { 235c2fa1e1bSJoel Fernandes (Google) return lockdep_is_held(&device_links_lock); 236c2fa1e1bSJoel Fernandes (Google) } 237c2fa1e1bSJoel Fernandes (Google) #endif 23880dd33cfSRafael J. Wysocki 23980dd33cfSRafael J. Wysocki static inline void device_link_synchronize_removal(void) 24080dd33cfSRafael J. Wysocki { 24180dd33cfSRafael J. Wysocki } 2420c871315SRafael J. Wysocki 2430c871315SRafael J. Wysocki static void device_link_remove_from_lists(struct device_link *link) 2440c871315SRafael J. Wysocki { 2450c871315SRafael J. Wysocki list_del(&link->s_node); 2460c871315SRafael J. Wysocki list_del(&link->c_node); 2470c871315SRafael J. Wysocki } 2489ed98953SRafael J. Wysocki #endif /* !CONFIG_SRCU */ 2499ed98953SRafael J. Wysocki 2503d1cf435SRafael J. Wysocki static bool device_is_ancestor(struct device *dev, struct device *target) 2513d1cf435SRafael J. Wysocki { 2523d1cf435SRafael J. Wysocki while (target->parent) { 2533d1cf435SRafael J. Wysocki target = target->parent; 2543d1cf435SRafael J. Wysocki if (dev == target) 2553d1cf435SRafael J. Wysocki return true; 2563d1cf435SRafael J. Wysocki } 2573d1cf435SRafael J. Wysocki return false; 2583d1cf435SRafael J. Wysocki } 2593d1cf435SRafael J. Wysocki 2609ed98953SRafael J. Wysocki /** 2619ed98953SRafael J. Wysocki * device_is_dependent - Check if one device depends on another one 2629ed98953SRafael J. Wysocki * @dev: Device to check dependencies for. 2639ed98953SRafael J. Wysocki * @target: Device to check against. 2649ed98953SRafael J. Wysocki * 2659ed98953SRafael J. Wysocki * Check if @target depends on @dev or any device dependent on it (its child or 2669ed98953SRafael J. Wysocki * its consumer etc). Return 1 if that is the case or 0 otherwise. 2679ed98953SRafael J. Wysocki */ 2687d34ca38SSaravana Kannan int device_is_dependent(struct device *dev, void *target) 2699ed98953SRafael J. Wysocki { 2709ed98953SRafael J. Wysocki struct device_link *link; 2719ed98953SRafael J. Wysocki int ret; 2729ed98953SRafael J. Wysocki 2733d1cf435SRafael J. Wysocki /* 2743d1cf435SRafael J. Wysocki * The "ancestors" check is needed to catch the case when the target 2753d1cf435SRafael J. Wysocki * device has not been completely initialized yet and it is still 2763d1cf435SRafael J. Wysocki * missing from the list of children of its parent device. 2773d1cf435SRafael J. Wysocki */ 2783d1cf435SRafael J. Wysocki if (dev == target || device_is_ancestor(dev, target)) 2799ed98953SRafael J. Wysocki return 1; 2809ed98953SRafael J. Wysocki 2819ed98953SRafael J. Wysocki ret = device_for_each_child(dev, target, device_is_dependent); 2829ed98953SRafael J. Wysocki if (ret) 2839ed98953SRafael J. Wysocki return ret; 2849ed98953SRafael J. Wysocki 2859ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 2864b9bbb29SSaravana Kannan if ((link->flags & ~DL_FLAG_INFERRED) == 2874b9bbb29SSaravana Kannan (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) 28805ef983eSSaravana Kannan continue; 28905ef983eSSaravana Kannan 290e16f4f3eSBenjamin Gaignard if (link->consumer == target) 2919ed98953SRafael J. Wysocki return 1; 2929ed98953SRafael J. Wysocki 2939ed98953SRafael J. Wysocki ret = device_is_dependent(link->consumer, target); 2949ed98953SRafael J. Wysocki if (ret) 2959ed98953SRafael J. Wysocki break; 2969ed98953SRafael J. Wysocki } 2979ed98953SRafael J. Wysocki return ret; 2989ed98953SRafael J. Wysocki } 2999ed98953SRafael J. Wysocki 300515db266SRafael J. Wysocki static void device_link_init_status(struct device_link *link, 301515db266SRafael J. Wysocki struct device *consumer, 302515db266SRafael J. Wysocki struct device *supplier) 303515db266SRafael J. Wysocki { 304515db266SRafael J. Wysocki switch (supplier->links.status) { 305515db266SRafael J. Wysocki case DL_DEV_PROBING: 306515db266SRafael J. Wysocki switch (consumer->links.status) { 307515db266SRafael J. Wysocki case DL_DEV_PROBING: 308515db266SRafael J. Wysocki /* 309515db266SRafael J. Wysocki * A consumer driver can create a link to a supplier 310515db266SRafael J. Wysocki * that has not completed its probing yet as long as it 311515db266SRafael J. Wysocki * knows that the supplier is already functional (for 312515db266SRafael J. Wysocki * example, it has just acquired some resources from the 313515db266SRafael J. Wysocki * supplier). 314515db266SRafael J. Wysocki */ 315515db266SRafael J. Wysocki link->status = DL_STATE_CONSUMER_PROBE; 316515db266SRafael J. Wysocki break; 317515db266SRafael J. Wysocki default: 318515db266SRafael J. Wysocki link->status = DL_STATE_DORMANT; 319515db266SRafael J. Wysocki break; 320515db266SRafael J. Wysocki } 321515db266SRafael J. Wysocki break; 322515db266SRafael J. Wysocki case DL_DEV_DRIVER_BOUND: 323515db266SRafael J. Wysocki switch (consumer->links.status) { 324515db266SRafael J. Wysocki case DL_DEV_PROBING: 325515db266SRafael J. Wysocki link->status = DL_STATE_CONSUMER_PROBE; 326515db266SRafael J. Wysocki break; 327515db266SRafael J. Wysocki case DL_DEV_DRIVER_BOUND: 328515db266SRafael J. Wysocki link->status = DL_STATE_ACTIVE; 329515db266SRafael J. Wysocki break; 330515db266SRafael J. Wysocki default: 331515db266SRafael J. Wysocki link->status = DL_STATE_AVAILABLE; 332515db266SRafael J. Wysocki break; 333515db266SRafael J. Wysocki } 334515db266SRafael J. Wysocki break; 335515db266SRafael J. Wysocki case DL_DEV_UNBINDING: 336515db266SRafael J. Wysocki link->status = DL_STATE_SUPPLIER_UNBIND; 337515db266SRafael J. Wysocki break; 338515db266SRafael J. Wysocki default: 339515db266SRafael J. Wysocki link->status = DL_STATE_DORMANT; 340515db266SRafael J. Wysocki break; 341515db266SRafael J. Wysocki } 342515db266SRafael J. Wysocki } 343515db266SRafael J. Wysocki 3449ed98953SRafael J. Wysocki static int device_reorder_to_tail(struct device *dev, void *not_used) 3459ed98953SRafael J. Wysocki { 3469ed98953SRafael J. Wysocki struct device_link *link; 3479ed98953SRafael J. Wysocki 3489ed98953SRafael J. Wysocki /* 3499ed98953SRafael J. Wysocki * Devices that have not been registered yet will be put to the ends 3509ed98953SRafael J. Wysocki * of the lists during the registration, so skip them here. 3519ed98953SRafael J. Wysocki */ 3529ed98953SRafael J. Wysocki if (device_is_registered(dev)) 3539ed98953SRafael J. Wysocki devices_kset_move_last(dev); 3549ed98953SRafael J. Wysocki 3559ed98953SRafael J. Wysocki if (device_pm_initialized(dev)) 3569ed98953SRafael J. Wysocki device_pm_move_last(dev); 3579ed98953SRafael J. Wysocki 3589ed98953SRafael J. Wysocki device_for_each_child(dev, NULL, device_reorder_to_tail); 35905ef983eSSaravana Kannan list_for_each_entry(link, &dev->links.consumers, s_node) { 3604b9bbb29SSaravana Kannan if ((link->flags & ~DL_FLAG_INFERRED) == 3614b9bbb29SSaravana Kannan (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) 36205ef983eSSaravana Kannan continue; 3639ed98953SRafael J. Wysocki device_reorder_to_tail(link->consumer, NULL); 36405ef983eSSaravana Kannan } 3659ed98953SRafael J. Wysocki 3669ed98953SRafael J. Wysocki return 0; 3679ed98953SRafael J. Wysocki } 3689ed98953SRafael J. Wysocki 3699ed98953SRafael J. Wysocki /** 370494fd7b7SFeng Kan * device_pm_move_to_tail - Move set of devices to the end of device lists 371494fd7b7SFeng Kan * @dev: Device to move 372494fd7b7SFeng Kan * 373494fd7b7SFeng Kan * This is a device_reorder_to_tail() wrapper taking the requisite locks. 374494fd7b7SFeng Kan * 375494fd7b7SFeng Kan * It moves the @dev along with all of its children and all of its consumers 376494fd7b7SFeng Kan * to the ends of the device_kset and dpm_list, recursively. 377494fd7b7SFeng Kan */ 378494fd7b7SFeng Kan void device_pm_move_to_tail(struct device *dev) 379494fd7b7SFeng Kan { 380494fd7b7SFeng Kan int idx; 381494fd7b7SFeng Kan 382494fd7b7SFeng Kan idx = device_links_read_lock(); 383494fd7b7SFeng Kan device_pm_lock(); 384494fd7b7SFeng Kan device_reorder_to_tail(dev, NULL); 385494fd7b7SFeng Kan device_pm_unlock(); 386494fd7b7SFeng Kan device_links_read_unlock(idx); 387494fd7b7SFeng Kan } 388494fd7b7SFeng Kan 389287905e6SSaravana Kannan #define to_devlink(dev) container_of((dev), struct device_link, link_dev) 390287905e6SSaravana Kannan 391287905e6SSaravana Kannan static ssize_t status_show(struct device *dev, 392287905e6SSaravana Kannan struct device_attribute *attr, char *buf) 393287905e6SSaravana Kannan { 394948b3edbSJoe Perches const char *output; 395287905e6SSaravana Kannan 396287905e6SSaravana Kannan switch (to_devlink(dev)->status) { 397287905e6SSaravana Kannan case DL_STATE_NONE: 398948b3edbSJoe Perches output = "not tracked"; 399948b3edbSJoe Perches break; 400287905e6SSaravana Kannan case DL_STATE_DORMANT: 401948b3edbSJoe Perches output = "dormant"; 402948b3edbSJoe Perches break; 403287905e6SSaravana Kannan case DL_STATE_AVAILABLE: 404948b3edbSJoe Perches output = "available"; 405948b3edbSJoe Perches break; 406287905e6SSaravana Kannan case DL_STATE_CONSUMER_PROBE: 407948b3edbSJoe Perches output = "consumer probing"; 408948b3edbSJoe Perches break; 409287905e6SSaravana Kannan case DL_STATE_ACTIVE: 410948b3edbSJoe Perches output = "active"; 411948b3edbSJoe Perches break; 412287905e6SSaravana Kannan case DL_STATE_SUPPLIER_UNBIND: 413948b3edbSJoe Perches output = "supplier unbinding"; 414948b3edbSJoe Perches break; 415287905e6SSaravana Kannan default: 416948b3edbSJoe Perches output = "unknown"; 417948b3edbSJoe Perches break; 418287905e6SSaravana Kannan } 419948b3edbSJoe Perches 420948b3edbSJoe Perches return sysfs_emit(buf, "%s\n", output); 421287905e6SSaravana Kannan } 422287905e6SSaravana Kannan static DEVICE_ATTR_RO(status); 423287905e6SSaravana Kannan 424287905e6SSaravana Kannan static ssize_t auto_remove_on_show(struct device *dev, 425287905e6SSaravana Kannan struct device_attribute *attr, char *buf) 426287905e6SSaravana Kannan { 427287905e6SSaravana Kannan struct device_link *link = to_devlink(dev); 428973c3911SJoe Perches const char *output; 429287905e6SSaravana Kannan 430287905e6SSaravana Kannan if (link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER) 431973c3911SJoe Perches output = "supplier unbind"; 432287905e6SSaravana Kannan else if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) 433973c3911SJoe Perches output = "consumer unbind"; 434287905e6SSaravana Kannan else 435973c3911SJoe Perches output = "never"; 436287905e6SSaravana Kannan 437973c3911SJoe Perches return sysfs_emit(buf, "%s\n", output); 438287905e6SSaravana Kannan } 439287905e6SSaravana Kannan static DEVICE_ATTR_RO(auto_remove_on); 440287905e6SSaravana Kannan 441287905e6SSaravana Kannan static ssize_t runtime_pm_show(struct device *dev, 442287905e6SSaravana Kannan struct device_attribute *attr, char *buf) 443287905e6SSaravana Kannan { 444287905e6SSaravana Kannan struct device_link *link = to_devlink(dev); 445287905e6SSaravana Kannan 446aa838896SJoe Perches return sysfs_emit(buf, "%d\n", !!(link->flags & DL_FLAG_PM_RUNTIME)); 447287905e6SSaravana Kannan } 448287905e6SSaravana Kannan static DEVICE_ATTR_RO(runtime_pm); 449287905e6SSaravana Kannan 450287905e6SSaravana Kannan static ssize_t sync_state_only_show(struct device *dev, 451287905e6SSaravana Kannan struct device_attribute *attr, char *buf) 452287905e6SSaravana Kannan { 453287905e6SSaravana Kannan struct device_link *link = to_devlink(dev); 454287905e6SSaravana Kannan 455aa838896SJoe Perches return sysfs_emit(buf, "%d\n", 456aa838896SJoe Perches !!(link->flags & DL_FLAG_SYNC_STATE_ONLY)); 457287905e6SSaravana Kannan } 458287905e6SSaravana Kannan static DEVICE_ATTR_RO(sync_state_only); 459287905e6SSaravana Kannan 460287905e6SSaravana Kannan static struct attribute *devlink_attrs[] = { 461287905e6SSaravana Kannan &dev_attr_status.attr, 462287905e6SSaravana Kannan &dev_attr_auto_remove_on.attr, 463287905e6SSaravana Kannan &dev_attr_runtime_pm.attr, 464287905e6SSaravana Kannan &dev_attr_sync_state_only.attr, 465287905e6SSaravana Kannan NULL, 466287905e6SSaravana Kannan }; 467287905e6SSaravana Kannan ATTRIBUTE_GROUPS(devlink); 468287905e6SSaravana Kannan 46980dd33cfSRafael J. Wysocki static void device_link_release_fn(struct work_struct *work) 470843e600bSSaravana Kannan { 47180dd33cfSRafael J. Wysocki struct device_link *link = container_of(work, struct device_link, rm_work); 47280dd33cfSRafael J. Wysocki 47380dd33cfSRafael J. Wysocki /* Ensure that all references to the link object have been dropped. */ 47480dd33cfSRafael J. Wysocki device_link_synchronize_removal(); 47580dd33cfSRafael J. Wysocki 476843e600bSSaravana Kannan while (refcount_dec_not_one(&link->rpm_active)) 477843e600bSSaravana Kannan pm_runtime_put(link->supplier); 478843e600bSSaravana Kannan 479843e600bSSaravana Kannan put_device(link->consumer); 480843e600bSSaravana Kannan put_device(link->supplier); 481843e600bSSaravana Kannan kfree(link); 482843e600bSSaravana Kannan } 483843e600bSSaravana Kannan 484287905e6SSaravana Kannan static void devlink_dev_release(struct device *dev) 485287905e6SSaravana Kannan { 486843e600bSSaravana Kannan struct device_link *link = to_devlink(dev); 487843e600bSSaravana Kannan 48880dd33cfSRafael J. Wysocki INIT_WORK(&link->rm_work, device_link_release_fn); 48980dd33cfSRafael J. Wysocki /* 49080dd33cfSRafael J. Wysocki * It may take a while to complete this work because of the SRCU 49180dd33cfSRafael J. Wysocki * synchronization in device_link_release_fn() and if the consumer or 49280dd33cfSRafael J. Wysocki * supplier devices get deleted when it runs, so put it into the "long" 49380dd33cfSRafael J. Wysocki * workqueue. 49480dd33cfSRafael J. Wysocki */ 49580dd33cfSRafael J. Wysocki queue_work(system_long_wq, &link->rm_work); 496287905e6SSaravana Kannan } 497287905e6SSaravana Kannan 498287905e6SSaravana Kannan static struct class devlink_class = { 499287905e6SSaravana Kannan .name = "devlink", 500287905e6SSaravana Kannan .owner = THIS_MODULE, 501287905e6SSaravana Kannan .dev_groups = devlink_groups, 502287905e6SSaravana Kannan .dev_release = devlink_dev_release, 503287905e6SSaravana Kannan }; 504287905e6SSaravana Kannan 505287905e6SSaravana Kannan static int devlink_add_symlinks(struct device *dev, 506287905e6SSaravana Kannan struct class_interface *class_intf) 507287905e6SSaravana Kannan { 508287905e6SSaravana Kannan int ret; 509287905e6SSaravana Kannan size_t len; 510287905e6SSaravana Kannan struct device_link *link = to_devlink(dev); 511287905e6SSaravana Kannan struct device *sup = link->supplier; 512287905e6SSaravana Kannan struct device *con = link->consumer; 513287905e6SSaravana Kannan char *buf; 514287905e6SSaravana Kannan 515e020ff61SSaravana Kannan len = max(strlen(dev_bus_name(sup)) + strlen(dev_name(sup)), 516e020ff61SSaravana Kannan strlen(dev_bus_name(con)) + strlen(dev_name(con))); 517e020ff61SSaravana Kannan len += strlen(":"); 518287905e6SSaravana Kannan len += strlen("supplier:") + 1; 519287905e6SSaravana Kannan buf = kzalloc(len, GFP_KERNEL); 520287905e6SSaravana Kannan if (!buf) 521287905e6SSaravana Kannan return -ENOMEM; 522287905e6SSaravana Kannan 523287905e6SSaravana Kannan ret = sysfs_create_link(&link->link_dev.kobj, &sup->kobj, "supplier"); 524287905e6SSaravana Kannan if (ret) 525287905e6SSaravana Kannan goto out; 526287905e6SSaravana Kannan 527287905e6SSaravana Kannan ret = sysfs_create_link(&link->link_dev.kobj, &con->kobj, "consumer"); 528287905e6SSaravana Kannan if (ret) 529287905e6SSaravana Kannan goto err_con; 530287905e6SSaravana Kannan 531e020ff61SSaravana Kannan snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con)); 532287905e6SSaravana Kannan ret = sysfs_create_link(&sup->kobj, &link->link_dev.kobj, buf); 533287905e6SSaravana Kannan if (ret) 534287905e6SSaravana Kannan goto err_con_dev; 535287905e6SSaravana Kannan 536e020ff61SSaravana Kannan snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup)); 537287905e6SSaravana Kannan ret = sysfs_create_link(&con->kobj, &link->link_dev.kobj, buf); 538287905e6SSaravana Kannan if (ret) 539287905e6SSaravana Kannan goto err_sup_dev; 540287905e6SSaravana Kannan 541287905e6SSaravana Kannan goto out; 542287905e6SSaravana Kannan 543287905e6SSaravana Kannan err_sup_dev: 544e020ff61SSaravana Kannan snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con)); 545287905e6SSaravana Kannan sysfs_remove_link(&sup->kobj, buf); 546287905e6SSaravana Kannan err_con_dev: 547287905e6SSaravana Kannan sysfs_remove_link(&link->link_dev.kobj, "consumer"); 548287905e6SSaravana Kannan err_con: 549287905e6SSaravana Kannan sysfs_remove_link(&link->link_dev.kobj, "supplier"); 550287905e6SSaravana Kannan out: 551287905e6SSaravana Kannan kfree(buf); 552287905e6SSaravana Kannan return ret; 553287905e6SSaravana Kannan } 554287905e6SSaravana Kannan 555287905e6SSaravana Kannan static void devlink_remove_symlinks(struct device *dev, 556287905e6SSaravana Kannan struct class_interface *class_intf) 557287905e6SSaravana Kannan { 558287905e6SSaravana Kannan struct device_link *link = to_devlink(dev); 559287905e6SSaravana Kannan size_t len; 560287905e6SSaravana Kannan struct device *sup = link->supplier; 561287905e6SSaravana Kannan struct device *con = link->consumer; 562287905e6SSaravana Kannan char *buf; 563287905e6SSaravana Kannan 564287905e6SSaravana Kannan sysfs_remove_link(&link->link_dev.kobj, "consumer"); 565287905e6SSaravana Kannan sysfs_remove_link(&link->link_dev.kobj, "supplier"); 566287905e6SSaravana Kannan 567e020ff61SSaravana Kannan len = max(strlen(dev_bus_name(sup)) + strlen(dev_name(sup)), 568e020ff61SSaravana Kannan strlen(dev_bus_name(con)) + strlen(dev_name(con))); 569e020ff61SSaravana Kannan len += strlen(":"); 570287905e6SSaravana Kannan len += strlen("supplier:") + 1; 571287905e6SSaravana Kannan buf = kzalloc(len, GFP_KERNEL); 572287905e6SSaravana Kannan if (!buf) { 573287905e6SSaravana Kannan WARN(1, "Unable to properly free device link symlinks!\n"); 574287905e6SSaravana Kannan return; 575287905e6SSaravana Kannan } 576287905e6SSaravana Kannan 577e020ff61SSaravana Kannan snprintf(buf, len, "supplier:%s:%s", dev_bus_name(sup), dev_name(sup)); 578287905e6SSaravana Kannan sysfs_remove_link(&con->kobj, buf); 579e020ff61SSaravana Kannan snprintf(buf, len, "consumer:%s:%s", dev_bus_name(con), dev_name(con)); 580287905e6SSaravana Kannan sysfs_remove_link(&sup->kobj, buf); 581287905e6SSaravana Kannan kfree(buf); 582287905e6SSaravana Kannan } 583287905e6SSaravana Kannan 584287905e6SSaravana Kannan static struct class_interface devlink_class_intf = { 585287905e6SSaravana Kannan .class = &devlink_class, 586287905e6SSaravana Kannan .add_dev = devlink_add_symlinks, 587287905e6SSaravana Kannan .remove_dev = devlink_remove_symlinks, 588287905e6SSaravana Kannan }; 589287905e6SSaravana Kannan 590287905e6SSaravana Kannan static int __init devlink_class_init(void) 591287905e6SSaravana Kannan { 592287905e6SSaravana Kannan int ret; 593287905e6SSaravana Kannan 594287905e6SSaravana Kannan ret = class_register(&devlink_class); 595287905e6SSaravana Kannan if (ret) 596287905e6SSaravana Kannan return ret; 597287905e6SSaravana Kannan 598287905e6SSaravana Kannan ret = class_interface_register(&devlink_class_intf); 599287905e6SSaravana Kannan if (ret) 600287905e6SSaravana Kannan class_unregister(&devlink_class); 601287905e6SSaravana Kannan 602287905e6SSaravana Kannan return ret; 603287905e6SSaravana Kannan } 604287905e6SSaravana Kannan postcore_initcall(devlink_class_init); 605287905e6SSaravana Kannan 606515db266SRafael J. Wysocki #define DL_MANAGED_LINK_FLAGS (DL_FLAG_AUTOREMOVE_CONSUMER | \ 607515db266SRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER | \ 60805ef983eSSaravana Kannan DL_FLAG_AUTOPROBE_CONSUMER | \ 6094b9bbb29SSaravana Kannan DL_FLAG_SYNC_STATE_ONLY | \ 6104b9bbb29SSaravana Kannan DL_FLAG_INFERRED) 611515db266SRafael J. Wysocki 612fb583c8eSRafael J. Wysocki #define DL_ADD_VALID_FLAGS (DL_MANAGED_LINK_FLAGS | DL_FLAG_STATELESS | \ 613fb583c8eSRafael J. Wysocki DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE) 614fb583c8eSRafael J. Wysocki 615494fd7b7SFeng Kan /** 6169ed98953SRafael J. Wysocki * device_link_add - Create a link between two devices. 6179ed98953SRafael J. Wysocki * @consumer: Consumer end of the link. 6189ed98953SRafael J. Wysocki * @supplier: Supplier end of the link. 6199ed98953SRafael J. Wysocki * @flags: Link flags. 6209ed98953SRafael J. Wysocki * 62121d5c57bSRafael J. Wysocki * The caller is responsible for the proper synchronization of the link creation 62221d5c57bSRafael J. Wysocki * with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the 62321d5c57bSRafael J. Wysocki * runtime PM framework to take the link into account. Second, if the 62421d5c57bSRafael J. Wysocki * DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will 62521d5c57bSRafael J. Wysocki * be forced into the active meta state and reference-counted upon the creation 62621d5c57bSRafael J. Wysocki * of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be 62721d5c57bSRafael J. Wysocki * ignored. 62821d5c57bSRafael J. Wysocki * 629515db266SRafael J. Wysocki * If DL_FLAG_STATELESS is set in @flags, the caller of this function is 630515db266SRafael J. Wysocki * expected to release the link returned by it directly with the help of either 631515db266SRafael J. Wysocki * device_link_del() or device_link_remove(). 63272175d4eSRafael J. Wysocki * 63372175d4eSRafael J. Wysocki * If that flag is not set, however, the caller of this function is handing the 63472175d4eSRafael J. Wysocki * management of the link over to the driver core entirely and its return value 63572175d4eSRafael J. Wysocki * can only be used to check whether or not the link is present. In that case, 63672175d4eSRafael J. Wysocki * the DL_FLAG_AUTOREMOVE_CONSUMER and DL_FLAG_AUTOREMOVE_SUPPLIER device link 63772175d4eSRafael J. Wysocki * flags can be used to indicate to the driver core when the link can be safely 63872175d4eSRafael J. Wysocki * deleted. Namely, setting one of them in @flags indicates to the driver core 63972175d4eSRafael J. Wysocki * that the link is not going to be used (by the given caller of this function) 64072175d4eSRafael J. Wysocki * after unbinding the consumer or supplier driver, respectively, from its 64172175d4eSRafael J. Wysocki * device, so the link can be deleted at that point. If none of them is set, 64272175d4eSRafael J. Wysocki * the link will be maintained until one of the devices pointed to by it (either 64372175d4eSRafael J. Wysocki * the consumer or the supplier) is unregistered. 644c8d50986SRafael J. Wysocki * 645e7dd4010SRafael J. Wysocki * Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and 646e7dd4010SRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent 647e7dd4010SRafael J. Wysocki * managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can 648d475f8eaSThierry Reding * be used to request the driver core to automatically probe for a consumer 649e7dd4010SRafael J. Wysocki * driver after successfully binding a driver to the supplier device. 650e7dd4010SRafael J. Wysocki * 651515db266SRafael J. Wysocki * The combination of DL_FLAG_STATELESS and one of DL_FLAG_AUTOREMOVE_CONSUMER, 652515db266SRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER, or DL_FLAG_AUTOPROBE_CONSUMER set in @flags at 653515db266SRafael J. Wysocki * the same time is invalid and will cause NULL to be returned upfront. 654515db266SRafael J. Wysocki * However, if a device link between the given @consumer and @supplier pair 655515db266SRafael J. Wysocki * exists already when this function is called for them, the existing link will 656515db266SRafael J. Wysocki * be returned regardless of its current type and status (the link's flags may 657515db266SRafael J. Wysocki * be modified then). The caller of this function is then expected to treat 658515db266SRafael J. Wysocki * the link as though it has just been created, so (in particular) if 659515db266SRafael J. Wysocki * DL_FLAG_STATELESS was passed in @flags, the link needs to be released 660515db266SRafael J. Wysocki * explicitly when not needed any more (as stated above). 6619ed98953SRafael J. Wysocki * 6629ed98953SRafael J. Wysocki * A side effect of the link creation is re-ordering of dpm_list and the 6639ed98953SRafael J. Wysocki * devices_kset list by moving the consumer device and all devices depending 6649ed98953SRafael J. Wysocki * on it to the ends of these lists (that does not happen to devices that have 6659ed98953SRafael J. Wysocki * not been registered when this function is called). 6669ed98953SRafael J. Wysocki * 6679ed98953SRafael J. Wysocki * The supplier device is required to be registered when this function is called 6689ed98953SRafael J. Wysocki * and NULL will be returned if that is not the case. The consumer device need 66964df1148SLukas Wunner * not be registered, however. 6709ed98953SRafael J. Wysocki */ 6719ed98953SRafael J. Wysocki struct device_link *device_link_add(struct device *consumer, 6729ed98953SRafael J. Wysocki struct device *supplier, u32 flags) 6739ed98953SRafael J. Wysocki { 6749ed98953SRafael J. Wysocki struct device_link *link; 6759ed98953SRafael J. Wysocki 676fb583c8eSRafael J. Wysocki if (!consumer || !supplier || flags & ~DL_ADD_VALID_FLAGS || 677515db266SRafael J. Wysocki (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) || 67805ef983eSSaravana Kannan (flags & DL_FLAG_SYNC_STATE_ONLY && 6794b9bbb29SSaravana Kannan (flags & ~DL_FLAG_INFERRED) != DL_FLAG_SYNC_STATE_ONLY) || 680e7dd4010SRafael J. Wysocki (flags & DL_FLAG_AUTOPROBE_CONSUMER && 681e7dd4010SRafael J. Wysocki flags & (DL_FLAG_AUTOREMOVE_CONSUMER | 682e7dd4010SRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER))) 6839ed98953SRafael J. Wysocki return NULL; 6849ed98953SRafael J. Wysocki 6855db25c9eSRafael J. Wysocki if (flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) { 6865db25c9eSRafael J. Wysocki if (pm_runtime_get_sync(supplier) < 0) { 6875db25c9eSRafael J. Wysocki pm_runtime_put_noidle(supplier); 6885db25c9eSRafael J. Wysocki return NULL; 6895db25c9eSRafael J. Wysocki } 6905db25c9eSRafael J. Wysocki } 6915db25c9eSRafael J. Wysocki 692515db266SRafael J. Wysocki if (!(flags & DL_FLAG_STATELESS)) 693515db266SRafael J. Wysocki flags |= DL_FLAG_MANAGED; 694515db266SRafael J. Wysocki 6959ed98953SRafael J. Wysocki device_links_write_lock(); 6969ed98953SRafael J. Wysocki device_pm_lock(); 6979ed98953SRafael J. Wysocki 6989ed98953SRafael J. Wysocki /* 6999ed98953SRafael J. Wysocki * If the supplier has not been fully registered yet or there is a 70005ef983eSSaravana Kannan * reverse (non-SYNC_STATE_ONLY) dependency between the consumer and 70105ef983eSSaravana Kannan * the supplier already in the graph, return NULL. If the link is a 70205ef983eSSaravana Kannan * SYNC_STATE_ONLY link, we don't check for reverse dependencies 70305ef983eSSaravana Kannan * because it only affects sync_state() callbacks. 7049ed98953SRafael J. Wysocki */ 7059ed98953SRafael J. Wysocki if (!device_pm_initialized(supplier) 70605ef983eSSaravana Kannan || (!(flags & DL_FLAG_SYNC_STATE_ONLY) && 70705ef983eSSaravana Kannan device_is_dependent(consumer, supplier))) { 7089ed98953SRafael J. Wysocki link = NULL; 7099ed98953SRafael J. Wysocki goto out; 7109ed98953SRafael J. Wysocki } 7119ed98953SRafael J. Wysocki 71272175d4eSRafael J. Wysocki /* 713ac66c5bbSSaravana Kannan * SYNC_STATE_ONLY links are useless once a consumer device has probed. 714ac66c5bbSSaravana Kannan * So, only create it if the consumer hasn't probed yet. 715ac66c5bbSSaravana Kannan */ 716ac66c5bbSSaravana Kannan if (flags & DL_FLAG_SYNC_STATE_ONLY && 717ac66c5bbSSaravana Kannan consumer->links.status != DL_DEV_NO_DRIVER && 718ac66c5bbSSaravana Kannan consumer->links.status != DL_DEV_PROBING) { 719ac66c5bbSSaravana Kannan link = NULL; 720ac66c5bbSSaravana Kannan goto out; 721ac66c5bbSSaravana Kannan } 722ac66c5bbSSaravana Kannan 723ac66c5bbSSaravana Kannan /* 72472175d4eSRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER indicates that the link will be needed 72572175d4eSRafael J. Wysocki * longer than for DL_FLAG_AUTOREMOVE_CONSUMER and setting them both 72672175d4eSRafael J. Wysocki * together doesn't make sense, so prefer DL_FLAG_AUTOREMOVE_SUPPLIER. 72772175d4eSRafael J. Wysocki */ 72872175d4eSRafael J. Wysocki if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) 72972175d4eSRafael J. Wysocki flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; 73072175d4eSRafael J. Wysocki 731f265df55SRafael J. Wysocki list_for_each_entry(link, &supplier->links.consumers, s_node) { 732f265df55SRafael J. Wysocki if (link->consumer != consumer) 733f265df55SRafael J. Wysocki continue; 734f265df55SRafael J. Wysocki 7354b9bbb29SSaravana Kannan if (link->flags & DL_FLAG_INFERRED && 7364b9bbb29SSaravana Kannan !(flags & DL_FLAG_INFERRED)) 7374b9bbb29SSaravana Kannan link->flags &= ~DL_FLAG_INFERRED; 7384b9bbb29SSaravana Kannan 739e2f3cd83SRafael J. Wysocki if (flags & DL_FLAG_PM_RUNTIME) { 740e2f3cd83SRafael J. Wysocki if (!(link->flags & DL_FLAG_PM_RUNTIME)) { 7414c06c4e6SRafael J. Wysocki pm_runtime_new_link(consumer); 742e2f3cd83SRafael J. Wysocki link->flags |= DL_FLAG_PM_RUNTIME; 743e2f3cd83SRafael J. Wysocki } 744e2f3cd83SRafael J. Wysocki if (flags & DL_FLAG_RPM_ACTIVE) 74536003d4cSRafael J. Wysocki refcount_inc(&link->rpm_active); 746e2f3cd83SRafael J. Wysocki } 747e2f3cd83SRafael J. Wysocki 74872175d4eSRafael J. Wysocki if (flags & DL_FLAG_STATELESS) { 749ead18c23SLukas Wunner kref_get(&link->kref); 75021c27f06SSaravana Kannan if (link->flags & DL_FLAG_SYNC_STATE_ONLY && 75144e96049SSaravana Kannan !(link->flags & DL_FLAG_STATELESS)) { 75244e96049SSaravana Kannan link->flags |= DL_FLAG_STATELESS; 75305ef983eSSaravana Kannan goto reorder; 75444e96049SSaravana Kannan } else { 75544e96049SSaravana Kannan link->flags |= DL_FLAG_STATELESS; 7569ed98953SRafael J. Wysocki goto out; 757ead18c23SLukas Wunner } 75844e96049SSaravana Kannan } 7599ed98953SRafael J. Wysocki 76072175d4eSRafael J. Wysocki /* 76172175d4eSRafael J. Wysocki * If the life time of the link following from the new flags is 76272175d4eSRafael J. Wysocki * longer than indicated by the flags of the existing link, 76372175d4eSRafael J. Wysocki * update the existing link to stay around longer. 76472175d4eSRafael J. Wysocki */ 76572175d4eSRafael J. Wysocki if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) { 76672175d4eSRafael J. Wysocki if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) { 76772175d4eSRafael J. Wysocki link->flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; 76872175d4eSRafael J. Wysocki link->flags |= DL_FLAG_AUTOREMOVE_SUPPLIER; 76972175d4eSRafael J. Wysocki } 77072175d4eSRafael J. Wysocki } else if (!(flags & DL_FLAG_AUTOREMOVE_CONSUMER)) { 77172175d4eSRafael J. Wysocki link->flags &= ~(DL_FLAG_AUTOREMOVE_CONSUMER | 77272175d4eSRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER); 77372175d4eSRafael J. Wysocki } 774515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) { 775515db266SRafael J. Wysocki kref_get(&link->kref); 776515db266SRafael J. Wysocki link->flags |= DL_FLAG_MANAGED; 777515db266SRafael J. Wysocki device_link_init_status(link, consumer, supplier); 778515db266SRafael J. Wysocki } 77905ef983eSSaravana Kannan if (link->flags & DL_FLAG_SYNC_STATE_ONLY && 78005ef983eSSaravana Kannan !(flags & DL_FLAG_SYNC_STATE_ONLY)) { 78105ef983eSSaravana Kannan link->flags &= ~DL_FLAG_SYNC_STATE_ONLY; 78205ef983eSSaravana Kannan goto reorder; 78305ef983eSSaravana Kannan } 78405ef983eSSaravana Kannan 78572175d4eSRafael J. Wysocki goto out; 78672175d4eSRafael J. Wysocki } 78772175d4eSRafael J. Wysocki 78821d5c57bSRafael J. Wysocki link = kzalloc(sizeof(*link), GFP_KERNEL); 7899ed98953SRafael J. Wysocki if (!link) 7909ed98953SRafael J. Wysocki goto out; 7919ed98953SRafael J. Wysocki 792e2f3cd83SRafael J. Wysocki refcount_set(&link->rpm_active, 1); 793e2f3cd83SRafael J. Wysocki 7949ed98953SRafael J. Wysocki get_device(supplier); 7959ed98953SRafael J. Wysocki link->supplier = supplier; 7969ed98953SRafael J. Wysocki INIT_LIST_HEAD(&link->s_node); 7979ed98953SRafael J. Wysocki get_device(consumer); 7989ed98953SRafael J. Wysocki link->consumer = consumer; 7999ed98953SRafael J. Wysocki INIT_LIST_HEAD(&link->c_node); 8009ed98953SRafael J. Wysocki link->flags = flags; 801ead18c23SLukas Wunner kref_init(&link->kref); 8029ed98953SRafael J. Wysocki 803287905e6SSaravana Kannan link->link_dev.class = &devlink_class; 804287905e6SSaravana Kannan device_set_pm_not_required(&link->link_dev); 805e020ff61SSaravana Kannan dev_set_name(&link->link_dev, "%s:%s--%s:%s", 806e020ff61SSaravana Kannan dev_bus_name(supplier), dev_name(supplier), 807e020ff61SSaravana Kannan dev_bus_name(consumer), dev_name(consumer)); 808287905e6SSaravana Kannan if (device_register(&link->link_dev)) { 809287905e6SSaravana Kannan put_device(consumer); 810287905e6SSaravana Kannan put_device(supplier); 811287905e6SSaravana Kannan kfree(link); 812287905e6SSaravana Kannan link = NULL; 813287905e6SSaravana Kannan goto out; 814287905e6SSaravana Kannan } 815287905e6SSaravana Kannan 816287905e6SSaravana Kannan if (flags & DL_FLAG_PM_RUNTIME) { 817287905e6SSaravana Kannan if (flags & DL_FLAG_RPM_ACTIVE) 818287905e6SSaravana Kannan refcount_inc(&link->rpm_active); 819287905e6SSaravana Kannan 820287905e6SSaravana Kannan pm_runtime_new_link(consumer); 821287905e6SSaravana Kannan } 822287905e6SSaravana Kannan 82364df1148SLukas Wunner /* Determine the initial link state. */ 824515db266SRafael J. Wysocki if (flags & DL_FLAG_STATELESS) 8259ed98953SRafael J. Wysocki link->status = DL_STATE_NONE; 826515db266SRafael J. Wysocki else 827515db266SRafael J. Wysocki device_link_init_status(link, consumer, supplier); 8289ed98953SRafael J. Wysocki 8299ed98953SRafael J. Wysocki /* 83015cfb094SRafael J. Wysocki * Some callers expect the link creation during consumer driver probe to 83115cfb094SRafael J. Wysocki * resume the supplier even without DL_FLAG_RPM_ACTIVE. 83215cfb094SRafael J. Wysocki */ 83315cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE && 83415cfb094SRafael J. Wysocki flags & DL_FLAG_PM_RUNTIME) 83515cfb094SRafael J. Wysocki pm_runtime_resume(supplier); 83615cfb094SRafael J. Wysocki 83721c27f06SSaravana Kannan list_add_tail_rcu(&link->s_node, &supplier->links.consumers); 83821c27f06SSaravana Kannan list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); 83921c27f06SSaravana Kannan 84005ef983eSSaravana Kannan if (flags & DL_FLAG_SYNC_STATE_ONLY) { 84105ef983eSSaravana Kannan dev_dbg(consumer, 84205ef983eSSaravana Kannan "Linked as a sync state only consumer to %s\n", 84305ef983eSSaravana Kannan dev_name(supplier)); 84405ef983eSSaravana Kannan goto out; 84505ef983eSSaravana Kannan } 84621c27f06SSaravana Kannan 84705ef983eSSaravana Kannan reorder: 84815cfb094SRafael J. Wysocki /* 8499ed98953SRafael J. Wysocki * Move the consumer and all of the devices depending on it to the end 8509ed98953SRafael J. Wysocki * of dpm_list and the devices_kset list. 8519ed98953SRafael J. Wysocki * 8529ed98953SRafael J. Wysocki * It is necessary to hold dpm_list locked throughout all that or else 8539ed98953SRafael J. Wysocki * we may end up suspending with a wrong ordering of it. 8549ed98953SRafael J. Wysocki */ 8559ed98953SRafael J. Wysocki device_reorder_to_tail(consumer, NULL); 8569ed98953SRafael J. Wysocki 8578a4b3269SJerome Brunet dev_dbg(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); 8589ed98953SRafael J. Wysocki 8599ed98953SRafael J. Wysocki out: 8609ed98953SRafael J. Wysocki device_pm_unlock(); 8619ed98953SRafael J. Wysocki device_links_write_unlock(); 8625db25c9eSRafael J. Wysocki 863e2f3cd83SRafael J. Wysocki if ((flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) && !link) 8645db25c9eSRafael J. Wysocki pm_runtime_put(supplier); 8655db25c9eSRafael J. Wysocki 8669ed98953SRafael J. Wysocki return link; 8679ed98953SRafael J. Wysocki } 8689ed98953SRafael J. Wysocki EXPORT_SYMBOL_GPL(device_link_add); 8699ed98953SRafael J. Wysocki 870ead18c23SLukas Wunner static void __device_link_del(struct kref *kref) 8719ed98953SRafael J. Wysocki { 872ead18c23SLukas Wunner struct device_link *link = container_of(kref, struct device_link, kref); 873ead18c23SLukas Wunner 8748a4b3269SJerome Brunet dev_dbg(link->consumer, "Dropping the link to %s\n", 8759ed98953SRafael J. Wysocki dev_name(link->supplier)); 8769ed98953SRafael J. Wysocki 877e0e398e2SRafael J. Wysocki pm_runtime_drop_link(link); 878baa8809fSRafael J. Wysocki 8790c871315SRafael J. Wysocki device_link_remove_from_lists(link); 880843e600bSSaravana Kannan device_unregister(&link->link_dev); 8819ed98953SRafael J. Wysocki } 8829ed98953SRafael J. Wysocki 88372175d4eSRafael J. Wysocki static void device_link_put_kref(struct device_link *link) 88472175d4eSRafael J. Wysocki { 88572175d4eSRafael J. Wysocki if (link->flags & DL_FLAG_STATELESS) 88672175d4eSRafael J. Wysocki kref_put(&link->kref, __device_link_del); 887*bf25967aSAdrian Hunter else if (!device_is_registered(link->consumer)) 888*bf25967aSAdrian Hunter __device_link_del(&link->kref); 88972175d4eSRafael J. Wysocki else 89072175d4eSRafael J. Wysocki WARN(1, "Unable to drop a managed device link reference\n"); 89172175d4eSRafael J. Wysocki } 89272175d4eSRafael J. Wysocki 8939ed98953SRafael J. Wysocki /** 89472175d4eSRafael J. Wysocki * device_link_del - Delete a stateless link between two devices. 8959ed98953SRafael J. Wysocki * @link: Device link to delete. 8969ed98953SRafael J. Wysocki * 8979ed98953SRafael J. Wysocki * The caller must ensure proper synchronization of this function with runtime 898ead18c23SLukas Wunner * PM. If the link was added multiple times, it needs to be deleted as often. 899ead18c23SLukas Wunner * Care is required for hotplugged devices: Their links are purged on removal 900ead18c23SLukas Wunner * and calling device_link_del() is then no longer allowed. 9019ed98953SRafael J. Wysocki */ 9029ed98953SRafael J. Wysocki void device_link_del(struct device_link *link) 9039ed98953SRafael J. Wysocki { 9049ed98953SRafael J. Wysocki device_links_write_lock(); 90572175d4eSRafael J. Wysocki device_link_put_kref(link); 9069ed98953SRafael J. Wysocki device_links_write_unlock(); 9079ed98953SRafael J. Wysocki } 9089ed98953SRafael J. Wysocki EXPORT_SYMBOL_GPL(device_link_del); 9099ed98953SRafael J. Wysocki 910d8842211Spascal paillet /** 91172175d4eSRafael J. Wysocki * device_link_remove - Delete a stateless link between two devices. 912d8842211Spascal paillet * @consumer: Consumer end of the link. 913d8842211Spascal paillet * @supplier: Supplier end of the link. 914d8842211Spascal paillet * 915d8842211Spascal paillet * The caller must ensure proper synchronization of this function with runtime 916d8842211Spascal paillet * PM. 917d8842211Spascal paillet */ 918d8842211Spascal paillet void device_link_remove(void *consumer, struct device *supplier) 919d8842211Spascal paillet { 920d8842211Spascal paillet struct device_link *link; 921d8842211Spascal paillet 922d8842211Spascal paillet if (WARN_ON(consumer == supplier)) 923d8842211Spascal paillet return; 924d8842211Spascal paillet 925d8842211Spascal paillet device_links_write_lock(); 926d8842211Spascal paillet 927d8842211Spascal paillet list_for_each_entry(link, &supplier->links.consumers, s_node) { 928d8842211Spascal paillet if (link->consumer == consumer) { 92972175d4eSRafael J. Wysocki device_link_put_kref(link); 930d8842211Spascal paillet break; 931d8842211Spascal paillet } 932d8842211Spascal paillet } 933d8842211Spascal paillet 934d8842211Spascal paillet device_links_write_unlock(); 935d8842211Spascal paillet } 936d8842211Spascal paillet EXPORT_SYMBOL_GPL(device_link_remove); 937d8842211Spascal paillet 9389ed98953SRafael J. Wysocki static void device_links_missing_supplier(struct device *dev) 9399ed98953SRafael J. Wysocki { 9409ed98953SRafael J. Wysocki struct device_link *link; 9419ed98953SRafael J. Wysocki 9428c3e315dSSaravana Kannan list_for_each_entry(link, &dev->links.suppliers, c_node) { 9438c3e315dSSaravana Kannan if (link->status != DL_STATE_CONSUMER_PROBE) 9448c3e315dSSaravana Kannan continue; 9458c3e315dSSaravana Kannan 9468c3e315dSSaravana Kannan if (link->supplier->links.status == DL_DEV_DRIVER_BOUND) { 9479ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 9488c3e315dSSaravana Kannan } else { 9498c3e315dSSaravana Kannan WARN_ON(!(link->flags & DL_FLAG_SYNC_STATE_ONLY)); 9508c3e315dSSaravana Kannan WRITE_ONCE(link->status, DL_STATE_DORMANT); 9518c3e315dSSaravana Kannan } 9528c3e315dSSaravana Kannan } 9539ed98953SRafael J. Wysocki } 9549ed98953SRafael J. Wysocki 9559ed98953SRafael J. Wysocki /** 9569ed98953SRafael J. Wysocki * device_links_check_suppliers - Check presence of supplier drivers. 9579ed98953SRafael J. Wysocki * @dev: Consumer device. 9589ed98953SRafael J. Wysocki * 9599ed98953SRafael J. Wysocki * Check links from this device to any suppliers. Walk the list of the device's 9609ed98953SRafael J. Wysocki * links to suppliers and see if all of them are available. If not, simply 9619ed98953SRafael J. Wysocki * return -EPROBE_DEFER. 9629ed98953SRafael J. Wysocki * 9639ed98953SRafael J. Wysocki * We need to guarantee that the supplier will not go away after the check has 9649ed98953SRafael J. Wysocki * been positive here. It only can go away in __device_release_driver() and 9659ed98953SRafael J. Wysocki * that function checks the device's links to consumers. This means we need to 9669ed98953SRafael J. Wysocki * mark the link as "consumer probe in progress" to make the supplier removal 9679ed98953SRafael J. Wysocki * wait for us to complete (or bad things may happen). 9689ed98953SRafael J. Wysocki * 969515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 9709ed98953SRafael J. Wysocki */ 9719ed98953SRafael J. Wysocki int device_links_check_suppliers(struct device *dev) 9729ed98953SRafael J. Wysocki { 9739ed98953SRafael J. Wysocki struct device_link *link; 9749ed98953SRafael J. Wysocki int ret = 0; 9759ed98953SRafael J. Wysocki 976e2ae9bccSSaravana Kannan /* 977e2ae9bccSSaravana Kannan * Device waiting for supplier to become available is not allowed to 978e2ae9bccSSaravana Kannan * probe. 979e2ae9bccSSaravana Kannan */ 98025ac86c6SSaravana Kannan mutex_lock(&fwnode_link_lock); 98125ac86c6SSaravana Kannan if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) && 98225ac86c6SSaravana Kannan !fw_devlink_is_permissive()) { 9831f0dfa05SSaravana Kannan dev_dbg(dev, "probe deferral - wait for supplier %pfwP\n", 9841f0dfa05SSaravana Kannan list_first_entry(&dev->fwnode->suppliers, 9851f0dfa05SSaravana Kannan struct fwnode_link, 9861f0dfa05SSaravana Kannan c_hook)->supplier); 98725ac86c6SSaravana Kannan mutex_unlock(&fwnode_link_lock); 988e2ae9bccSSaravana Kannan return -EPROBE_DEFER; 989e2ae9bccSSaravana Kannan } 99025ac86c6SSaravana Kannan mutex_unlock(&fwnode_link_lock); 991e2ae9bccSSaravana Kannan 9929ed98953SRafael J. Wysocki device_links_write_lock(); 9939ed98953SRafael J. Wysocki 9949ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.suppliers, c_node) { 9958c3e315dSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED)) 9969ed98953SRafael J. Wysocki continue; 9979ed98953SRafael J. Wysocki 9988c3e315dSSaravana Kannan if (link->status != DL_STATE_AVAILABLE && 9998c3e315dSSaravana Kannan !(link->flags & DL_FLAG_SYNC_STATE_ONLY)) { 10009ed98953SRafael J. Wysocki device_links_missing_supplier(dev); 10011f0dfa05SSaravana Kannan dev_dbg(dev, "probe deferral - supplier %s not ready\n", 10021f0dfa05SSaravana Kannan dev_name(link->supplier)); 10039ed98953SRafael J. Wysocki ret = -EPROBE_DEFER; 10049ed98953SRafael J. Wysocki break; 10059ed98953SRafael J. Wysocki } 10069ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); 10079ed98953SRafael J. Wysocki } 10089ed98953SRafael J. Wysocki dev->links.status = DL_DEV_PROBING; 10099ed98953SRafael J. Wysocki 10109ed98953SRafael J. Wysocki device_links_write_unlock(); 10119ed98953SRafael J. Wysocki return ret; 10129ed98953SRafael J. Wysocki } 10139ed98953SRafael J. Wysocki 101426e77708SSaravana Kannan /** 101526e77708SSaravana Kannan * __device_links_queue_sync_state - Queue a device for sync_state() callback 101626e77708SSaravana Kannan * @dev: Device to call sync_state() on 101726e77708SSaravana Kannan * @list: List head to queue the @dev on 101826e77708SSaravana Kannan * 101926e77708SSaravana Kannan * Queues a device for a sync_state() callback when the device links write lock 102026e77708SSaravana Kannan * isn't held. This allows the sync_state() execution flow to use device links 102126e77708SSaravana Kannan * APIs. The caller must ensure this function is called with 102226e77708SSaravana Kannan * device_links_write_lock() held. 102326e77708SSaravana Kannan * 102426e77708SSaravana Kannan * This function does a get_device() to make sure the device is not freed while 102526e77708SSaravana Kannan * on this list. 102626e77708SSaravana Kannan * 102726e77708SSaravana Kannan * So the caller must also ensure that device_links_flush_sync_list() is called 102826e77708SSaravana Kannan * as soon as the caller releases device_links_write_lock(). This is necessary 102926e77708SSaravana Kannan * to make sure the sync_state() is called in a timely fashion and the 103026e77708SSaravana Kannan * put_device() is called on this device. 103126e77708SSaravana Kannan */ 103226e77708SSaravana Kannan static void __device_links_queue_sync_state(struct device *dev, 103326e77708SSaravana Kannan struct list_head *list) 1034fc5a251dSSaravana Kannan { 1035fc5a251dSSaravana Kannan struct device_link *link; 1036fc5a251dSSaravana Kannan 103777036165SSaravana Kannan if (!dev_has_sync_state(dev)) 103877036165SSaravana Kannan return; 1039fc5a251dSSaravana Kannan if (dev->state_synced) 1040fc5a251dSSaravana Kannan return; 1041fc5a251dSSaravana Kannan 1042fc5a251dSSaravana Kannan list_for_each_entry(link, &dev->links.consumers, s_node) { 1043fc5a251dSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED)) 1044fc5a251dSSaravana Kannan continue; 1045fc5a251dSSaravana Kannan if (link->status != DL_STATE_ACTIVE) 1046fc5a251dSSaravana Kannan return; 1047fc5a251dSSaravana Kannan } 1048fc5a251dSSaravana Kannan 104926e77708SSaravana Kannan /* 105026e77708SSaravana Kannan * Set the flag here to avoid adding the same device to a list more 105126e77708SSaravana Kannan * than once. This can happen if new consumers get added to the device 105226e77708SSaravana Kannan * and probed before the list is flushed. 105326e77708SSaravana Kannan */ 105426e77708SSaravana Kannan dev->state_synced = true; 105526e77708SSaravana Kannan 10563b052a3eSSaravana Kannan if (WARN_ON(!list_empty(&dev->links.defer_sync))) 105726e77708SSaravana Kannan return; 105826e77708SSaravana Kannan 105926e77708SSaravana Kannan get_device(dev); 10603b052a3eSSaravana Kannan list_add_tail(&dev->links.defer_sync, list); 106126e77708SSaravana Kannan } 106226e77708SSaravana Kannan 106326e77708SSaravana Kannan /** 106426e77708SSaravana Kannan * device_links_flush_sync_list - Call sync_state() on a list of devices 106526e77708SSaravana Kannan * @list: List of devices to call sync_state() on 106621eb93f4SSaravana Kannan * @dont_lock_dev: Device for which lock is already held by the caller 106726e77708SSaravana Kannan * 106826e77708SSaravana Kannan * Calls sync_state() on all the devices that have been queued for it. This 106921eb93f4SSaravana Kannan * function is used in conjunction with __device_links_queue_sync_state(). The 107021eb93f4SSaravana Kannan * @dont_lock_dev parameter is useful when this function is called from a 107121eb93f4SSaravana Kannan * context where a device lock is already held. 107226e77708SSaravana Kannan */ 107321eb93f4SSaravana Kannan static void device_links_flush_sync_list(struct list_head *list, 107421eb93f4SSaravana Kannan struct device *dont_lock_dev) 107526e77708SSaravana Kannan { 107626e77708SSaravana Kannan struct device *dev, *tmp; 107726e77708SSaravana Kannan 10783b052a3eSSaravana Kannan list_for_each_entry_safe(dev, tmp, list, links.defer_sync) { 10793b052a3eSSaravana Kannan list_del_init(&dev->links.defer_sync); 108026e77708SSaravana Kannan 108121eb93f4SSaravana Kannan if (dev != dont_lock_dev) 108226e77708SSaravana Kannan device_lock(dev); 108326e77708SSaravana Kannan 1084fc5a251dSSaravana Kannan if (dev->bus->sync_state) 1085fc5a251dSSaravana Kannan dev->bus->sync_state(dev); 1086fc5a251dSSaravana Kannan else if (dev->driver && dev->driver->sync_state) 1087fc5a251dSSaravana Kannan dev->driver->sync_state(dev); 1088fc5a251dSSaravana Kannan 108921eb93f4SSaravana Kannan if (dev != dont_lock_dev) 109026e77708SSaravana Kannan device_unlock(dev); 109126e77708SSaravana Kannan 109226e77708SSaravana Kannan put_device(dev); 109326e77708SSaravana Kannan } 1094fc5a251dSSaravana Kannan } 1095fc5a251dSSaravana Kannan 1096fc5a251dSSaravana Kannan void device_links_supplier_sync_state_pause(void) 1097fc5a251dSSaravana Kannan { 1098fc5a251dSSaravana Kannan device_links_write_lock(); 1099fc5a251dSSaravana Kannan defer_sync_state_count++; 1100fc5a251dSSaravana Kannan device_links_write_unlock(); 1101fc5a251dSSaravana Kannan } 1102fc5a251dSSaravana Kannan 1103fc5a251dSSaravana Kannan void device_links_supplier_sync_state_resume(void) 1104fc5a251dSSaravana Kannan { 1105fc5a251dSSaravana Kannan struct device *dev, *tmp; 110626e77708SSaravana Kannan LIST_HEAD(sync_list); 1107fc5a251dSSaravana Kannan 1108fc5a251dSSaravana Kannan device_links_write_lock(); 1109fc5a251dSSaravana Kannan if (!defer_sync_state_count) { 1110fc5a251dSSaravana Kannan WARN(true, "Unmatched sync_state pause/resume!"); 1111fc5a251dSSaravana Kannan goto out; 1112fc5a251dSSaravana Kannan } 1113fc5a251dSSaravana Kannan defer_sync_state_count--; 1114fc5a251dSSaravana Kannan if (defer_sync_state_count) 1115fc5a251dSSaravana Kannan goto out; 1116fc5a251dSSaravana Kannan 11173b052a3eSSaravana Kannan list_for_each_entry_safe(dev, tmp, &deferred_sync, links.defer_sync) { 111826e77708SSaravana Kannan /* 111926e77708SSaravana Kannan * Delete from deferred_sync list before queuing it to 11203b052a3eSSaravana Kannan * sync_list because defer_sync is used for both lists. 112126e77708SSaravana Kannan */ 11223b052a3eSSaravana Kannan list_del_init(&dev->links.defer_sync); 112326e77708SSaravana Kannan __device_links_queue_sync_state(dev, &sync_list); 1124fc5a251dSSaravana Kannan } 1125fc5a251dSSaravana Kannan out: 1126fc5a251dSSaravana Kannan device_links_write_unlock(); 112726e77708SSaravana Kannan 112821eb93f4SSaravana Kannan device_links_flush_sync_list(&sync_list, NULL); 1129fc5a251dSSaravana Kannan } 1130fc5a251dSSaravana Kannan 1131fc5a251dSSaravana Kannan static int sync_state_resume_initcall(void) 1132fc5a251dSSaravana Kannan { 1133fc5a251dSSaravana Kannan device_links_supplier_sync_state_resume(); 1134fc5a251dSSaravana Kannan return 0; 1135fc5a251dSSaravana Kannan } 1136fc5a251dSSaravana Kannan late_initcall(sync_state_resume_initcall); 1137fc5a251dSSaravana Kannan 1138fc5a251dSSaravana Kannan static void __device_links_supplier_defer_sync(struct device *sup) 1139fc5a251dSSaravana Kannan { 11403b052a3eSSaravana Kannan if (list_empty(&sup->links.defer_sync) && dev_has_sync_state(sup)) 11413b052a3eSSaravana Kannan list_add_tail(&sup->links.defer_sync, &deferred_sync); 1142fc5a251dSSaravana Kannan } 1143fc5a251dSSaravana Kannan 114421c27f06SSaravana Kannan static void device_link_drop_managed(struct device_link *link) 114521c27f06SSaravana Kannan { 114621c27f06SSaravana Kannan link->flags &= ~DL_FLAG_MANAGED; 114721c27f06SSaravana Kannan WRITE_ONCE(link->status, DL_STATE_NONE); 114821c27f06SSaravana Kannan kref_put(&link->kref, __device_link_del); 114921c27f06SSaravana Kannan } 115021c27f06SSaravana Kannan 1151da6d6475SSaravana Kannan static ssize_t waiting_for_supplier_show(struct device *dev, 1152da6d6475SSaravana Kannan struct device_attribute *attr, 1153da6d6475SSaravana Kannan char *buf) 1154da6d6475SSaravana Kannan { 1155da6d6475SSaravana Kannan bool val; 1156da6d6475SSaravana Kannan 1157da6d6475SSaravana Kannan device_lock(dev); 115825ac86c6SSaravana Kannan val = !list_empty(&dev->fwnode->suppliers); 1159da6d6475SSaravana Kannan device_unlock(dev); 1160aa838896SJoe Perches return sysfs_emit(buf, "%u\n", val); 1161da6d6475SSaravana Kannan } 1162da6d6475SSaravana Kannan static DEVICE_ATTR_RO(waiting_for_supplier); 1163da6d6475SSaravana Kannan 11649ed98953SRafael J. Wysocki /** 1165b6f617dfSSaravana Kannan * device_links_force_bind - Prepares device to be force bound 1166b6f617dfSSaravana Kannan * @dev: Consumer device. 1167b6f617dfSSaravana Kannan * 1168b6f617dfSSaravana Kannan * device_bind_driver() force binds a device to a driver without calling any 1169b6f617dfSSaravana Kannan * driver probe functions. So the consumer really isn't going to wait for any 1170b6f617dfSSaravana Kannan * supplier before it's bound to the driver. We still want the device link 1171b6f617dfSSaravana Kannan * states to be sensible when this happens. 1172b6f617dfSSaravana Kannan * 1173b6f617dfSSaravana Kannan * In preparation for device_bind_driver(), this function goes through each 1174b6f617dfSSaravana Kannan * supplier device links and checks if the supplier is bound. If it is, then 1175b6f617dfSSaravana Kannan * the device link status is set to CONSUMER_PROBE. Otherwise, the device link 1176b6f617dfSSaravana Kannan * is dropped. Links without the DL_FLAG_MANAGED flag set are ignored. 1177b6f617dfSSaravana Kannan */ 1178b6f617dfSSaravana Kannan void device_links_force_bind(struct device *dev) 1179b6f617dfSSaravana Kannan { 1180b6f617dfSSaravana Kannan struct device_link *link, *ln; 1181b6f617dfSSaravana Kannan 1182b6f617dfSSaravana Kannan device_links_write_lock(); 1183b6f617dfSSaravana Kannan 1184b6f617dfSSaravana Kannan list_for_each_entry_safe(link, ln, &dev->links.suppliers, c_node) { 1185b6f617dfSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED)) 1186b6f617dfSSaravana Kannan continue; 1187b6f617dfSSaravana Kannan 1188b6f617dfSSaravana Kannan if (link->status != DL_STATE_AVAILABLE) { 1189b6f617dfSSaravana Kannan device_link_drop_managed(link); 1190b6f617dfSSaravana Kannan continue; 1191b6f617dfSSaravana Kannan } 1192b6f617dfSSaravana Kannan WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); 1193b6f617dfSSaravana Kannan } 1194b6f617dfSSaravana Kannan dev->links.status = DL_DEV_PROBING; 1195b6f617dfSSaravana Kannan 1196b6f617dfSSaravana Kannan device_links_write_unlock(); 1197b6f617dfSSaravana Kannan } 1198b6f617dfSSaravana Kannan 1199b6f617dfSSaravana Kannan /** 12009ed98953SRafael J. Wysocki * device_links_driver_bound - Update device links after probing its driver. 12019ed98953SRafael J. Wysocki * @dev: Device to update the links for. 12029ed98953SRafael J. Wysocki * 12039ed98953SRafael J. Wysocki * The probe has been successful, so update links from this device to any 12049ed98953SRafael J. Wysocki * consumers by changing their status to "available". 12059ed98953SRafael J. Wysocki * 12069ed98953SRafael J. Wysocki * Also change the status of @dev's links to suppliers to "active". 12079ed98953SRafael J. Wysocki * 1208515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 12099ed98953SRafael J. Wysocki */ 12109ed98953SRafael J. Wysocki void device_links_driver_bound(struct device *dev) 12119ed98953SRafael J. Wysocki { 121221c27f06SSaravana Kannan struct device_link *link, *ln; 121326e77708SSaravana Kannan LIST_HEAD(sync_list); 12149ed98953SRafael J. Wysocki 1215bcbbcfd5SSaravana Kannan /* 12169528e0d9SSaravana Kannan * If a device binds successfully, it's expected to have created all 1217bcbbcfd5SSaravana Kannan * the device links it needs to or make new device links as it needs 12189528e0d9SSaravana Kannan * them. So, fw_devlink no longer needs to create device links to any 12199528e0d9SSaravana Kannan * of the device's suppliers. 12209528e0d9SSaravana Kannan * 12219528e0d9SSaravana Kannan * Also, if a child firmware node of this bound device is not added as 12229528e0d9SSaravana Kannan * a device by now, assume it is never going to be added and make sure 12239528e0d9SSaravana Kannan * other devices don't defer probe indefinitely by waiting for such a 12249528e0d9SSaravana Kannan * child device. 1225bcbbcfd5SSaravana Kannan */ 12269528e0d9SSaravana Kannan if (dev->fwnode && dev->fwnode->dev == dev) { 12279528e0d9SSaravana Kannan struct fwnode_handle *child; 1228f9aa4606SSaravana Kannan fwnode_links_purge_suppliers(dev->fwnode); 12299528e0d9SSaravana Kannan fwnode_for_each_available_child_node(dev->fwnode, child) 12309528e0d9SSaravana Kannan fw_devlink_purge_absent_suppliers(child); 12319528e0d9SSaravana Kannan } 1232da6d6475SSaravana Kannan device_remove_file(dev, &dev_attr_waiting_for_supplier); 1233bcbbcfd5SSaravana Kannan 12349ed98953SRafael J. Wysocki device_links_write_lock(); 12359ed98953SRafael J. Wysocki 12369ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 1237515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 12389ed98953SRafael J. Wysocki continue; 12399ed98953SRafael J. Wysocki 124015cfb094SRafael J. Wysocki /* 124115cfb094SRafael J. Wysocki * Links created during consumer probe may be in the "consumer 124215cfb094SRafael J. Wysocki * probe" state to start with if the supplier is still probing 124315cfb094SRafael J. Wysocki * when they are created and they may become "active" if the 124415cfb094SRafael J. Wysocki * consumer probe returns first. Skip them here. 124515cfb094SRafael J. Wysocki */ 124615cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE || 124715cfb094SRafael J. Wysocki link->status == DL_STATE_ACTIVE) 124815cfb094SRafael J. Wysocki continue; 124915cfb094SRafael J. Wysocki 12509ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_DORMANT); 12519ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 1252e7dd4010SRafael J. Wysocki 1253e7dd4010SRafael J. Wysocki if (link->flags & DL_FLAG_AUTOPROBE_CONSUMER) 1254e7dd4010SRafael J. Wysocki driver_deferred_probe_add(link->consumer); 12559ed98953SRafael J. Wysocki } 12569ed98953SRafael J. Wysocki 125721eb93f4SSaravana Kannan if (defer_sync_state_count) 125821eb93f4SSaravana Kannan __device_links_supplier_defer_sync(dev); 125921eb93f4SSaravana Kannan else 126021eb93f4SSaravana Kannan __device_links_queue_sync_state(dev, &sync_list); 126121eb93f4SSaravana Kannan 126221c27f06SSaravana Kannan list_for_each_entry_safe(link, ln, &dev->links.suppliers, c_node) { 126321c27f06SSaravana Kannan struct device *supplier; 126421c27f06SSaravana Kannan 1265515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 12669ed98953SRafael J. Wysocki continue; 12679ed98953SRafael J. Wysocki 126821c27f06SSaravana Kannan supplier = link->supplier; 126921c27f06SSaravana Kannan if (link->flags & DL_FLAG_SYNC_STATE_ONLY) { 127021c27f06SSaravana Kannan /* 127121c27f06SSaravana Kannan * When DL_FLAG_SYNC_STATE_ONLY is set, it means no 127221c27f06SSaravana Kannan * other DL_MANAGED_LINK_FLAGS have been set. So, it's 127321c27f06SSaravana Kannan * save to drop the managed link completely. 127421c27f06SSaravana Kannan */ 127521c27f06SSaravana Kannan device_link_drop_managed(link); 127621c27f06SSaravana Kannan } else { 12779ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); 12789ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_ACTIVE); 127921c27f06SSaravana Kannan } 1280fc5a251dSSaravana Kannan 128121c27f06SSaravana Kannan /* 128221c27f06SSaravana Kannan * This needs to be done even for the deleted 128321c27f06SSaravana Kannan * DL_FLAG_SYNC_STATE_ONLY device link in case it was the last 128421c27f06SSaravana Kannan * device link that was preventing the supplier from getting a 128521c27f06SSaravana Kannan * sync_state() call. 128621c27f06SSaravana Kannan */ 1287fc5a251dSSaravana Kannan if (defer_sync_state_count) 128821c27f06SSaravana Kannan __device_links_supplier_defer_sync(supplier); 1289fc5a251dSSaravana Kannan else 129021c27f06SSaravana Kannan __device_links_queue_sync_state(supplier, &sync_list); 12919ed98953SRafael J. Wysocki } 12929ed98953SRafael J. Wysocki 12939ed98953SRafael J. Wysocki dev->links.status = DL_DEV_DRIVER_BOUND; 12949ed98953SRafael J. Wysocki 12959ed98953SRafael J. Wysocki device_links_write_unlock(); 129626e77708SSaravana Kannan 129721eb93f4SSaravana Kannan device_links_flush_sync_list(&sync_list, dev); 12989ed98953SRafael J. Wysocki } 12999ed98953SRafael J. Wysocki 13009ed98953SRafael J. Wysocki /** 13019ed98953SRafael J. Wysocki * __device_links_no_driver - Update links of a device without a driver. 13029ed98953SRafael J. Wysocki * @dev: Device without a drvier. 13039ed98953SRafael J. Wysocki * 13049ed98953SRafael J. Wysocki * Delete all non-persistent links from this device to any suppliers. 13059ed98953SRafael J. Wysocki * 13069ed98953SRafael J. Wysocki * Persistent links stay around, but their status is changed to "available", 13079ed98953SRafael J. Wysocki * unless they already are in the "supplier unbind in progress" state in which 13089ed98953SRafael J. Wysocki * case they need not be updated. 13099ed98953SRafael J. Wysocki * 1310515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 13119ed98953SRafael J. Wysocki */ 13129ed98953SRafael J. Wysocki static void __device_links_no_driver(struct device *dev) 13139ed98953SRafael J. Wysocki { 13149ed98953SRafael J. Wysocki struct device_link *link, *ln; 13159ed98953SRafael J. Wysocki 13169ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { 1317515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 13189ed98953SRafael J. Wysocki continue; 13199ed98953SRafael J. Wysocki 13208c3e315dSSaravana Kannan if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) { 1321515db266SRafael J. Wysocki device_link_drop_managed(link); 13228c3e315dSSaravana Kannan continue; 13238c3e315dSSaravana Kannan } 13248c3e315dSSaravana Kannan 13258c3e315dSSaravana Kannan if (link->status != DL_STATE_CONSUMER_PROBE && 13268c3e315dSSaravana Kannan link->status != DL_STATE_ACTIVE) 13278c3e315dSSaravana Kannan continue; 13288c3e315dSSaravana Kannan 13298c3e315dSSaravana Kannan if (link->supplier->links.status == DL_DEV_DRIVER_BOUND) { 13309ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 13318c3e315dSSaravana Kannan } else { 13328c3e315dSSaravana Kannan WARN_ON(!(link->flags & DL_FLAG_SYNC_STATE_ONLY)); 13338c3e315dSSaravana Kannan WRITE_ONCE(link->status, DL_STATE_DORMANT); 13348c3e315dSSaravana Kannan } 13359ed98953SRafael J. Wysocki } 13369ed98953SRafael J. Wysocki 13379ed98953SRafael J. Wysocki dev->links.status = DL_DEV_NO_DRIVER; 13389ed98953SRafael J. Wysocki } 13399ed98953SRafael J. Wysocki 134015cfb094SRafael J. Wysocki /** 134115cfb094SRafael J. Wysocki * device_links_no_driver - Update links after failing driver probe. 134215cfb094SRafael J. Wysocki * @dev: Device whose driver has just failed to probe. 134315cfb094SRafael J. Wysocki * 134415cfb094SRafael J. Wysocki * Clean up leftover links to consumers for @dev and invoke 134515cfb094SRafael J. Wysocki * %__device_links_no_driver() to update links to suppliers for it as 134615cfb094SRafael J. Wysocki * appropriate. 134715cfb094SRafael J. Wysocki * 1348515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 134915cfb094SRafael J. Wysocki */ 13509ed98953SRafael J. Wysocki void device_links_no_driver(struct device *dev) 13519ed98953SRafael J. Wysocki { 135215cfb094SRafael J. Wysocki struct device_link *link; 135315cfb094SRafael J. Wysocki 13549ed98953SRafael J. Wysocki device_links_write_lock(); 135515cfb094SRafael J. Wysocki 135615cfb094SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 1357515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 135815cfb094SRafael J. Wysocki continue; 135915cfb094SRafael J. Wysocki 136015cfb094SRafael J. Wysocki /* 136115cfb094SRafael J. Wysocki * The probe has failed, so if the status of the link is 136215cfb094SRafael J. Wysocki * "consumer probe" or "active", it must have been added by 136315cfb094SRafael J. Wysocki * a probing consumer while this device was still probing. 136415cfb094SRafael J. Wysocki * Change its state to "dormant", as it represents a valid 136515cfb094SRafael J. Wysocki * relationship, but it is not functionally meaningful. 136615cfb094SRafael J. Wysocki */ 136715cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE || 136815cfb094SRafael J. Wysocki link->status == DL_STATE_ACTIVE) 136915cfb094SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_DORMANT); 137015cfb094SRafael J. Wysocki } 137115cfb094SRafael J. Wysocki 13729ed98953SRafael J. Wysocki __device_links_no_driver(dev); 137315cfb094SRafael J. Wysocki 13749ed98953SRafael J. Wysocki device_links_write_unlock(); 13759ed98953SRafael J. Wysocki } 13769ed98953SRafael J. Wysocki 13779ed98953SRafael J. Wysocki /** 13789ed98953SRafael J. Wysocki * device_links_driver_cleanup - Update links after driver removal. 13799ed98953SRafael J. Wysocki * @dev: Device whose driver has just gone away. 13809ed98953SRafael J. Wysocki * 13819ed98953SRafael J. Wysocki * Update links to consumers for @dev by changing their status to "dormant" and 13829ed98953SRafael J. Wysocki * invoke %__device_links_no_driver() to update links to suppliers for it as 13839ed98953SRafael J. Wysocki * appropriate. 13849ed98953SRafael J. Wysocki * 1385515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 13869ed98953SRafael J. Wysocki */ 13879ed98953SRafael J. Wysocki void device_links_driver_cleanup(struct device *dev) 13889ed98953SRafael J. Wysocki { 1389c8d50986SRafael J. Wysocki struct device_link *link, *ln; 13909ed98953SRafael J. Wysocki 13919ed98953SRafael J. Wysocki device_links_write_lock(); 13929ed98953SRafael J. Wysocki 1393c8d50986SRafael J. Wysocki list_for_each_entry_safe(link, ln, &dev->links.consumers, s_node) { 1394515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 13959ed98953SRafael J. Wysocki continue; 13969ed98953SRafael J. Wysocki 1397e88728f4SVivek Gautam WARN_ON(link->flags & DL_FLAG_AUTOREMOVE_CONSUMER); 13989ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); 13991689cac5SVivek Gautam 14001689cac5SVivek Gautam /* 14011689cac5SVivek Gautam * autoremove the links between this @dev and its consumer 14021689cac5SVivek Gautam * devices that are not active, i.e. where the link state 14031689cac5SVivek Gautam * has moved to DL_STATE_SUPPLIER_UNBIND. 14041689cac5SVivek Gautam */ 14051689cac5SVivek Gautam if (link->status == DL_STATE_SUPPLIER_UNBIND && 14061689cac5SVivek Gautam link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER) 1407515db266SRafael J. Wysocki device_link_drop_managed(link); 14081689cac5SVivek Gautam 14099ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_DORMANT); 14109ed98953SRafael J. Wysocki } 14119ed98953SRafael J. Wysocki 14123b052a3eSSaravana Kannan list_del_init(&dev->links.defer_sync); 14139ed98953SRafael J. Wysocki __device_links_no_driver(dev); 14149ed98953SRafael J. Wysocki 14159ed98953SRafael J. Wysocki device_links_write_unlock(); 14169ed98953SRafael J. Wysocki } 14179ed98953SRafael J. Wysocki 14189ed98953SRafael J. Wysocki /** 14199ed98953SRafael J. Wysocki * device_links_busy - Check if there are any busy links to consumers. 14209ed98953SRafael J. Wysocki * @dev: Device to check. 14219ed98953SRafael J. Wysocki * 14229ed98953SRafael J. Wysocki * Check each consumer of the device and return 'true' if its link's status 14239ed98953SRafael J. Wysocki * is one of "consumer probe" or "active" (meaning that the given consumer is 14249ed98953SRafael J. Wysocki * probing right now or its driver is present). Otherwise, change the link 14259ed98953SRafael J. Wysocki * state to "supplier unbind" to prevent the consumer from being probed 14269ed98953SRafael J. Wysocki * successfully going forward. 14279ed98953SRafael J. Wysocki * 14289ed98953SRafael J. Wysocki * Return 'false' if there are no probing or active consumers. 14299ed98953SRafael J. Wysocki * 1430515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 14319ed98953SRafael J. Wysocki */ 14329ed98953SRafael J. Wysocki bool device_links_busy(struct device *dev) 14339ed98953SRafael J. Wysocki { 14349ed98953SRafael J. Wysocki struct device_link *link; 14359ed98953SRafael J. Wysocki bool ret = false; 14369ed98953SRafael J. Wysocki 14379ed98953SRafael J. Wysocki device_links_write_lock(); 14389ed98953SRafael J. Wysocki 14399ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 1440515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 14419ed98953SRafael J. Wysocki continue; 14429ed98953SRafael J. Wysocki 14439ed98953SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE 14449ed98953SRafael J. Wysocki || link->status == DL_STATE_ACTIVE) { 14459ed98953SRafael J. Wysocki ret = true; 14469ed98953SRafael J. Wysocki break; 14479ed98953SRafael J. Wysocki } 14489ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); 14499ed98953SRafael J. Wysocki } 14509ed98953SRafael J. Wysocki 14519ed98953SRafael J. Wysocki dev->links.status = DL_DEV_UNBINDING; 14529ed98953SRafael J. Wysocki 14539ed98953SRafael J. Wysocki device_links_write_unlock(); 14549ed98953SRafael J. Wysocki return ret; 14559ed98953SRafael J. Wysocki } 14569ed98953SRafael J. Wysocki 14579ed98953SRafael J. Wysocki /** 14589ed98953SRafael J. Wysocki * device_links_unbind_consumers - Force unbind consumers of the given device. 14599ed98953SRafael J. Wysocki * @dev: Device to unbind the consumers of. 14609ed98953SRafael J. Wysocki * 14619ed98953SRafael J. Wysocki * Walk the list of links to consumers for @dev and if any of them is in the 14629ed98953SRafael J. Wysocki * "consumer probe" state, wait for all device probes in progress to complete 14639ed98953SRafael J. Wysocki * and start over. 14649ed98953SRafael J. Wysocki * 14659ed98953SRafael J. Wysocki * If that's not the case, change the status of the link to "supplier unbind" 14669ed98953SRafael J. Wysocki * and check if the link was in the "active" state. If so, force the consumer 14679ed98953SRafael J. Wysocki * driver to unbind and start over (the consumer will not re-probe as we have 14689ed98953SRafael J. Wysocki * changed the state of the link already). 14699ed98953SRafael J. Wysocki * 1470515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 14719ed98953SRafael J. Wysocki */ 14729ed98953SRafael J. Wysocki void device_links_unbind_consumers(struct device *dev) 14739ed98953SRafael J. Wysocki { 14749ed98953SRafael J. Wysocki struct device_link *link; 14759ed98953SRafael J. Wysocki 14769ed98953SRafael J. Wysocki start: 14779ed98953SRafael J. Wysocki device_links_write_lock(); 14789ed98953SRafael J. Wysocki 14799ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 14809ed98953SRafael J. Wysocki enum device_link_state status; 14819ed98953SRafael J. Wysocki 148205ef983eSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED) || 148305ef983eSSaravana Kannan link->flags & DL_FLAG_SYNC_STATE_ONLY) 14849ed98953SRafael J. Wysocki continue; 14859ed98953SRafael J. Wysocki 14869ed98953SRafael J. Wysocki status = link->status; 14879ed98953SRafael J. Wysocki if (status == DL_STATE_CONSUMER_PROBE) { 14889ed98953SRafael J. Wysocki device_links_write_unlock(); 14899ed98953SRafael J. Wysocki 14909ed98953SRafael J. Wysocki wait_for_device_probe(); 14919ed98953SRafael J. Wysocki goto start; 14929ed98953SRafael J. Wysocki } 14939ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); 14949ed98953SRafael J. Wysocki if (status == DL_STATE_ACTIVE) { 14959ed98953SRafael J. Wysocki struct device *consumer = link->consumer; 14969ed98953SRafael J. Wysocki 14979ed98953SRafael J. Wysocki get_device(consumer); 14989ed98953SRafael J. Wysocki 14999ed98953SRafael J. Wysocki device_links_write_unlock(); 15009ed98953SRafael J. Wysocki 15019ed98953SRafael J. Wysocki device_release_driver_internal(consumer, NULL, 15029ed98953SRafael J. Wysocki consumer->parent); 15039ed98953SRafael J. Wysocki put_device(consumer); 15049ed98953SRafael J. Wysocki goto start; 15059ed98953SRafael J. Wysocki } 15069ed98953SRafael J. Wysocki } 15079ed98953SRafael J. Wysocki 15089ed98953SRafael J. Wysocki device_links_write_unlock(); 15099ed98953SRafael J. Wysocki } 15109ed98953SRafael J. Wysocki 15119ed98953SRafael J. Wysocki /** 15129ed98953SRafael J. Wysocki * device_links_purge - Delete existing links to other devices. 15139ed98953SRafael J. Wysocki * @dev: Target device. 15149ed98953SRafael J. Wysocki */ 15159ed98953SRafael J. Wysocki static void device_links_purge(struct device *dev) 15169ed98953SRafael J. Wysocki { 15179ed98953SRafael J. Wysocki struct device_link *link, *ln; 15189ed98953SRafael J. Wysocki 1519287905e6SSaravana Kannan if (dev->class == &devlink_class) 1520287905e6SSaravana Kannan return; 1521287905e6SSaravana Kannan 15229ed98953SRafael J. Wysocki /* 15239ed98953SRafael J. Wysocki * Delete all of the remaining links from this device to any other 15249ed98953SRafael J. Wysocki * devices (either consumers or suppliers). 15259ed98953SRafael J. Wysocki */ 15269ed98953SRafael J. Wysocki device_links_write_lock(); 15279ed98953SRafael J. Wysocki 15289ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { 15299ed98953SRafael J. Wysocki WARN_ON(link->status == DL_STATE_ACTIVE); 1530ead18c23SLukas Wunner __device_link_del(&link->kref); 15319ed98953SRafael J. Wysocki } 15329ed98953SRafael J. Wysocki 15339ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { 15349ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_DORMANT && 15359ed98953SRafael J. Wysocki link->status != DL_STATE_NONE); 1536ead18c23SLukas Wunner __device_link_del(&link->kref); 15379ed98953SRafael J. Wysocki } 15389ed98953SRafael J. Wysocki 15399ed98953SRafael J. Wysocki device_links_write_unlock(); 15409ed98953SRafael J. Wysocki } 15419ed98953SRafael J. Wysocki 1542b90fb8f6SSaravana Kannan #define FW_DEVLINK_FLAGS_PERMISSIVE (DL_FLAG_INFERRED | \ 1543b90fb8f6SSaravana Kannan DL_FLAG_SYNC_STATE_ONLY) 1544b90fb8f6SSaravana Kannan #define FW_DEVLINK_FLAGS_ON (DL_FLAG_INFERRED | \ 1545b90fb8f6SSaravana Kannan DL_FLAG_AUTOPROBE_CONSUMER) 1546b90fb8f6SSaravana Kannan #define FW_DEVLINK_FLAGS_RPM (FW_DEVLINK_FLAGS_ON | \ 1547b90fb8f6SSaravana Kannan DL_FLAG_PM_RUNTIME) 1548b90fb8f6SSaravana Kannan 1549ea718c69SSaravana Kannan static u32 fw_devlink_flags = FW_DEVLINK_FLAGS_ON; 155042926ac3SSaravana Kannan static int __init fw_devlink_setup(char *arg) 155142926ac3SSaravana Kannan { 155242926ac3SSaravana Kannan if (!arg) 155342926ac3SSaravana Kannan return -EINVAL; 155442926ac3SSaravana Kannan 155542926ac3SSaravana Kannan if (strcmp(arg, "off") == 0) { 155642926ac3SSaravana Kannan fw_devlink_flags = 0; 155742926ac3SSaravana Kannan } else if (strcmp(arg, "permissive") == 0) { 1558b90fb8f6SSaravana Kannan fw_devlink_flags = FW_DEVLINK_FLAGS_PERMISSIVE; 155942926ac3SSaravana Kannan } else if (strcmp(arg, "on") == 0) { 1560b90fb8f6SSaravana Kannan fw_devlink_flags = FW_DEVLINK_FLAGS_ON; 156142926ac3SSaravana Kannan } else if (strcmp(arg, "rpm") == 0) { 1562b90fb8f6SSaravana Kannan fw_devlink_flags = FW_DEVLINK_FLAGS_RPM; 156342926ac3SSaravana Kannan } 156442926ac3SSaravana Kannan return 0; 156542926ac3SSaravana Kannan } 156642926ac3SSaravana Kannan early_param("fw_devlink", fw_devlink_setup); 156742926ac3SSaravana Kannan 156819d0f5f6SSaravana Kannan static bool fw_devlink_strict; 156919d0f5f6SSaravana Kannan static int __init fw_devlink_strict_setup(char *arg) 157019d0f5f6SSaravana Kannan { 157119d0f5f6SSaravana Kannan return strtobool(arg, &fw_devlink_strict); 157219d0f5f6SSaravana Kannan } 157319d0f5f6SSaravana Kannan early_param("fw_devlink.strict", fw_devlink_strict_setup); 157419d0f5f6SSaravana Kannan 157542926ac3SSaravana Kannan u32 fw_devlink_get_flags(void) 157642926ac3SSaravana Kannan { 157742926ac3SSaravana Kannan return fw_devlink_flags; 157842926ac3SSaravana Kannan } 157942926ac3SSaravana Kannan 158042926ac3SSaravana Kannan static bool fw_devlink_is_permissive(void) 158142926ac3SSaravana Kannan { 1582b90fb8f6SSaravana Kannan return fw_devlink_flags == FW_DEVLINK_FLAGS_PERMISSIVE; 158342926ac3SSaravana Kannan } 158442926ac3SSaravana Kannan 158519d0f5f6SSaravana Kannan bool fw_devlink_is_strict(void) 158619d0f5f6SSaravana Kannan { 158719d0f5f6SSaravana Kannan return fw_devlink_strict && !fw_devlink_is_permissive(); 15889ed98953SRafael J. Wysocki } 15899ed98953SRafael J. Wysocki 1590c2c724c8SSaravana Kannan static void fw_devlink_parse_fwnode(struct fwnode_handle *fwnode) 1591c2c724c8SSaravana Kannan { 1592c2c724c8SSaravana Kannan if (fwnode->flags & FWNODE_FLAG_LINKS_ADDED) 1593c2c724c8SSaravana Kannan return; 1594c2c724c8SSaravana Kannan 15952d09e6ebSSaravana Kannan fwnode_call_int_op(fwnode, add_links); 1596c2c724c8SSaravana Kannan fwnode->flags |= FWNODE_FLAG_LINKS_ADDED; 1597c2c724c8SSaravana Kannan } 1598c2c724c8SSaravana Kannan 1599c2c724c8SSaravana Kannan static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode) 1600c2c724c8SSaravana Kannan { 1601c2c724c8SSaravana Kannan struct fwnode_handle *child = NULL; 1602c2c724c8SSaravana Kannan 1603c2c724c8SSaravana Kannan fw_devlink_parse_fwnode(fwnode); 1604c2c724c8SSaravana Kannan 1605c2c724c8SSaravana Kannan while ((child = fwnode_get_next_available_child_node(fwnode, child))) 1606c2c724c8SSaravana Kannan fw_devlink_parse_fwtree(child); 1607c2c724c8SSaravana Kannan } 1608c2c724c8SSaravana Kannan 1609d46f3e3eSSaravana Kannan static void fw_devlink_relax_link(struct device_link *link) 1610d46f3e3eSSaravana Kannan { 1611d46f3e3eSSaravana Kannan if (!(link->flags & DL_FLAG_INFERRED)) 1612d46f3e3eSSaravana Kannan return; 1613d46f3e3eSSaravana Kannan 1614d46f3e3eSSaravana Kannan if (link->flags == (DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE)) 1615d46f3e3eSSaravana Kannan return; 1616d46f3e3eSSaravana Kannan 1617d46f3e3eSSaravana Kannan pm_runtime_drop_link(link); 1618d46f3e3eSSaravana Kannan link->flags = DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE; 1619d46f3e3eSSaravana Kannan dev_dbg(link->consumer, "Relaxing link with %s\n", 1620d46f3e3eSSaravana Kannan dev_name(link->supplier)); 1621d46f3e3eSSaravana Kannan } 1622d46f3e3eSSaravana Kannan 1623d46f3e3eSSaravana Kannan static int fw_devlink_no_driver(struct device *dev, void *data) 1624d46f3e3eSSaravana Kannan { 1625d46f3e3eSSaravana Kannan struct device_link *link = to_devlink(dev); 1626d46f3e3eSSaravana Kannan 1627d46f3e3eSSaravana Kannan if (!link->supplier->can_match) 1628d46f3e3eSSaravana Kannan fw_devlink_relax_link(link); 1629d46f3e3eSSaravana Kannan 1630d46f3e3eSSaravana Kannan return 0; 1631d46f3e3eSSaravana Kannan } 1632d46f3e3eSSaravana Kannan 1633d46f3e3eSSaravana Kannan void fw_devlink_drivers_done(void) 1634d46f3e3eSSaravana Kannan { 1635d46f3e3eSSaravana Kannan fw_devlink_drv_reg_done = true; 1636d46f3e3eSSaravana Kannan device_links_write_lock(); 1637d46f3e3eSSaravana Kannan class_for_each_device(&devlink_class, NULL, NULL, 1638d46f3e3eSSaravana Kannan fw_devlink_no_driver); 1639d46f3e3eSSaravana Kannan device_links_write_unlock(); 1640d46f3e3eSSaravana Kannan } 1641d46f3e3eSSaravana Kannan 1642d46f3e3eSSaravana Kannan static void fw_devlink_unblock_consumers(struct device *dev) 1643d46f3e3eSSaravana Kannan { 1644d46f3e3eSSaravana Kannan struct device_link *link; 1645d46f3e3eSSaravana Kannan 1646d46f3e3eSSaravana Kannan if (!fw_devlink_flags || fw_devlink_is_permissive()) 1647d46f3e3eSSaravana Kannan return; 1648d46f3e3eSSaravana Kannan 1649d46f3e3eSSaravana Kannan device_links_write_lock(); 1650d46f3e3eSSaravana Kannan list_for_each_entry(link, &dev->links.consumers, s_node) 1651d46f3e3eSSaravana Kannan fw_devlink_relax_link(link); 1652d46f3e3eSSaravana Kannan device_links_write_unlock(); 1653d46f3e3eSSaravana Kannan } 1654d46f3e3eSSaravana Kannan 1655f9aa4606SSaravana Kannan /** 1656b0e2fa4fSSaravana Kannan * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links 1657b0e2fa4fSSaravana Kannan * @con: Device to check dependencies for. 1658b0e2fa4fSSaravana Kannan * @sup: Device to check against. 1659b0e2fa4fSSaravana Kannan * 1660b0e2fa4fSSaravana Kannan * Check if @sup depends on @con or any device dependent on it (its child or 1661b0e2fa4fSSaravana Kannan * its consumer etc). When such a cyclic dependency is found, convert all 1662b0e2fa4fSSaravana Kannan * device links created solely by fw_devlink into SYNC_STATE_ONLY device links. 1663b0e2fa4fSSaravana Kannan * This is the equivalent of doing fw_devlink=permissive just between the 1664b0e2fa4fSSaravana Kannan * devices in the cycle. We need to do this because, at this point, fw_devlink 1665b0e2fa4fSSaravana Kannan * can't tell which of these dependencies is not a real dependency. 1666b0e2fa4fSSaravana Kannan * 1667b0e2fa4fSSaravana Kannan * Return 1 if a cycle is found. Otherwise, return 0. 1668b0e2fa4fSSaravana Kannan */ 1669c13b8279Skernel test robot static int fw_devlink_relax_cycle(struct device *con, void *sup) 1670b0e2fa4fSSaravana Kannan { 1671b0e2fa4fSSaravana Kannan struct device_link *link; 1672b0e2fa4fSSaravana Kannan int ret; 1673b0e2fa4fSSaravana Kannan 1674b0e2fa4fSSaravana Kannan if (con == sup) 1675b0e2fa4fSSaravana Kannan return 1; 1676b0e2fa4fSSaravana Kannan 1677b0e2fa4fSSaravana Kannan ret = device_for_each_child(con, sup, fw_devlink_relax_cycle); 1678b0e2fa4fSSaravana Kannan if (ret) 1679b0e2fa4fSSaravana Kannan return ret; 1680b0e2fa4fSSaravana Kannan 1681b0e2fa4fSSaravana Kannan list_for_each_entry(link, &con->links.consumers, s_node) { 1682b0e2fa4fSSaravana Kannan if ((link->flags & ~DL_FLAG_INFERRED) == 1683b0e2fa4fSSaravana Kannan (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) 1684b0e2fa4fSSaravana Kannan continue; 1685b0e2fa4fSSaravana Kannan 1686b0e2fa4fSSaravana Kannan if (!fw_devlink_relax_cycle(link->consumer, sup)) 1687b0e2fa4fSSaravana Kannan continue; 1688b0e2fa4fSSaravana Kannan 1689b0e2fa4fSSaravana Kannan ret = 1; 1690b0e2fa4fSSaravana Kannan 1691d46f3e3eSSaravana Kannan fw_devlink_relax_link(link); 1692b0e2fa4fSSaravana Kannan } 1693b0e2fa4fSSaravana Kannan return ret; 1694b0e2fa4fSSaravana Kannan } 1695b0e2fa4fSSaravana Kannan 1696b0e2fa4fSSaravana Kannan /** 1697f9aa4606SSaravana Kannan * fw_devlink_create_devlink - Create a device link from a consumer to fwnode 169837c52f74SPierre-Louis Bossart * @con: consumer device for the device link 169937c52f74SPierre-Louis Bossart * @sup_handle: fwnode handle of supplier 170037c52f74SPierre-Louis Bossart * @flags: devlink flags 1701f9aa4606SSaravana Kannan * 1702f9aa4606SSaravana Kannan * This function will try to create a device link between the consumer device 1703f9aa4606SSaravana Kannan * @con and the supplier device represented by @sup_handle. 1704f9aa4606SSaravana Kannan * 1705f9aa4606SSaravana Kannan * The supplier has to be provided as a fwnode because incorrect cycles in 1706f9aa4606SSaravana Kannan * fwnode links can sometimes cause the supplier device to never be created. 1707f9aa4606SSaravana Kannan * This function detects such cases and returns an error if it cannot create a 1708f9aa4606SSaravana Kannan * device link from the consumer to a missing supplier. 1709f9aa4606SSaravana Kannan * 1710f9aa4606SSaravana Kannan * Returns, 1711f9aa4606SSaravana Kannan * 0 on successfully creating a device link 1712f9aa4606SSaravana Kannan * -EINVAL if the device link cannot be created as expected 1713f9aa4606SSaravana Kannan * -EAGAIN if the device link cannot be created right now, but it may be 1714f9aa4606SSaravana Kannan * possible to do that in the future 1715f9aa4606SSaravana Kannan */ 1716f9aa4606SSaravana Kannan static int fw_devlink_create_devlink(struct device *con, 1717f9aa4606SSaravana Kannan struct fwnode_handle *sup_handle, u32 flags) 1718f9aa4606SSaravana Kannan { 1719f9aa4606SSaravana Kannan struct device *sup_dev; 1720f9aa4606SSaravana Kannan int ret = 0; 1721f9aa4606SSaravana Kannan 1722f9aa4606SSaravana Kannan sup_dev = get_dev_from_fwnode(sup_handle); 1723f9aa4606SSaravana Kannan if (sup_dev) { 1724f9aa4606SSaravana Kannan /* 172574c782cfSSaravana Kannan * If it's one of those drivers that don't actually bind to 172674c782cfSSaravana Kannan * their device using driver core, then don't wait on this 172774c782cfSSaravana Kannan * supplier device indefinitely. 172874c782cfSSaravana Kannan */ 172974c782cfSSaravana Kannan if (sup_dev->links.status == DL_DEV_NO_DRIVER && 173074c782cfSSaravana Kannan sup_handle->flags & FWNODE_FLAG_INITIALIZED) { 173174c782cfSSaravana Kannan ret = -EINVAL; 173274c782cfSSaravana Kannan goto out; 173374c782cfSSaravana Kannan } 173474c782cfSSaravana Kannan 173574c782cfSSaravana Kannan /* 1736f9aa4606SSaravana Kannan * If this fails, it is due to cycles in device links. Just 1737f9aa4606SSaravana Kannan * give up on this link and treat it as invalid. 1738f9aa4606SSaravana Kannan */ 1739b0e2fa4fSSaravana Kannan if (!device_link_add(con, sup_dev, flags) && 1740b0e2fa4fSSaravana Kannan !(flags & DL_FLAG_SYNC_STATE_ONLY)) { 1741b0e2fa4fSSaravana Kannan dev_info(con, "Fixing up cyclic dependency with %s\n", 1742b0e2fa4fSSaravana Kannan dev_name(sup_dev)); 1743b0e2fa4fSSaravana Kannan device_links_write_lock(); 1744b0e2fa4fSSaravana Kannan fw_devlink_relax_cycle(con, sup_dev); 1745b0e2fa4fSSaravana Kannan device_links_write_unlock(); 1746b0e2fa4fSSaravana Kannan device_link_add(con, sup_dev, 1747b0e2fa4fSSaravana Kannan FW_DEVLINK_FLAGS_PERMISSIVE); 1748f9aa4606SSaravana Kannan ret = -EINVAL; 1749b0e2fa4fSSaravana Kannan } 1750f9aa4606SSaravana Kannan 1751f9aa4606SSaravana Kannan goto out; 1752f9aa4606SSaravana Kannan } 1753f9aa4606SSaravana Kannan 175474c782cfSSaravana Kannan /* Supplier that's already initialized without a struct device. */ 175574c782cfSSaravana Kannan if (sup_handle->flags & FWNODE_FLAG_INITIALIZED) 175674c782cfSSaravana Kannan return -EINVAL; 175774c782cfSSaravana Kannan 1758f9aa4606SSaravana Kannan /* 1759f9aa4606SSaravana Kannan * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports 1760f9aa4606SSaravana Kannan * cycles. So cycle detection isn't necessary and shouldn't be 1761f9aa4606SSaravana Kannan * done. 1762f9aa4606SSaravana Kannan */ 1763f9aa4606SSaravana Kannan if (flags & DL_FLAG_SYNC_STATE_ONLY) 1764f9aa4606SSaravana Kannan return -EAGAIN; 1765f9aa4606SSaravana Kannan 1766f9aa4606SSaravana Kannan /* 1767f9aa4606SSaravana Kannan * If we can't find the supplier device from its fwnode, it might be 1768f9aa4606SSaravana Kannan * due to a cyclic dependency between fwnodes. Some of these cycles can 1769f9aa4606SSaravana Kannan * be broken by applying logic. Check for these types of cycles and 1770f9aa4606SSaravana Kannan * break them so that devices in the cycle probe properly. 1771f9aa4606SSaravana Kannan * 1772f9aa4606SSaravana Kannan * If the supplier's parent is dependent on the consumer, then 1773f9aa4606SSaravana Kannan * the consumer-supplier dependency is a false dependency. So, 1774f9aa4606SSaravana Kannan * treat it as an invalid link. 1775f9aa4606SSaravana Kannan */ 1776f9aa4606SSaravana Kannan sup_dev = fwnode_get_next_parent_dev(sup_handle); 1777f9aa4606SSaravana Kannan if (sup_dev && device_is_dependent(con, sup_dev)) { 1778f9aa4606SSaravana Kannan dev_dbg(con, "Not linking to %pfwP - False link\n", 1779f9aa4606SSaravana Kannan sup_handle); 1780f9aa4606SSaravana Kannan ret = -EINVAL; 1781f9aa4606SSaravana Kannan } else { 1782f9aa4606SSaravana Kannan /* 1783f9aa4606SSaravana Kannan * Can't check for cycles or no cycles. So let's try 1784f9aa4606SSaravana Kannan * again later. 1785f9aa4606SSaravana Kannan */ 1786f9aa4606SSaravana Kannan ret = -EAGAIN; 1787f9aa4606SSaravana Kannan } 1788f9aa4606SSaravana Kannan 1789f9aa4606SSaravana Kannan out: 1790f9aa4606SSaravana Kannan put_device(sup_dev); 1791f9aa4606SSaravana Kannan return ret; 1792f9aa4606SSaravana Kannan } 1793f9aa4606SSaravana Kannan 1794f9aa4606SSaravana Kannan /** 1795f9aa4606SSaravana Kannan * __fw_devlink_link_to_consumers - Create device links to consumers of a device 179637c52f74SPierre-Louis Bossart * @dev: Device that needs to be linked to its consumers 1797f9aa4606SSaravana Kannan * 1798f9aa4606SSaravana Kannan * This function looks at all the consumer fwnodes of @dev and creates device 1799f9aa4606SSaravana Kannan * links between the consumer device and @dev (supplier). 1800f9aa4606SSaravana Kannan * 1801f9aa4606SSaravana Kannan * If the consumer device has not been added yet, then this function creates a 1802f9aa4606SSaravana Kannan * SYNC_STATE_ONLY link between @dev (supplier) and the closest ancestor device 1803f9aa4606SSaravana Kannan * of the consumer fwnode. This is necessary to make sure @dev doesn't get a 1804f9aa4606SSaravana Kannan * sync_state() callback before the real consumer device gets to be added and 1805f9aa4606SSaravana Kannan * then probed. 1806f9aa4606SSaravana Kannan * 1807f9aa4606SSaravana Kannan * Once device links are created from the real consumer to @dev (supplier), the 1808f9aa4606SSaravana Kannan * fwnode links are deleted. 1809f9aa4606SSaravana Kannan */ 1810f9aa4606SSaravana Kannan static void __fw_devlink_link_to_consumers(struct device *dev) 1811f9aa4606SSaravana Kannan { 1812f9aa4606SSaravana Kannan struct fwnode_handle *fwnode = dev->fwnode; 1813f9aa4606SSaravana Kannan struct fwnode_link *link, *tmp; 1814f9aa4606SSaravana Kannan 1815f9aa4606SSaravana Kannan list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) { 1816f9aa4606SSaravana Kannan u32 dl_flags = fw_devlink_get_flags(); 1817f9aa4606SSaravana Kannan struct device *con_dev; 1818f9aa4606SSaravana Kannan bool own_link = true; 1819f9aa4606SSaravana Kannan int ret; 1820f9aa4606SSaravana Kannan 1821f9aa4606SSaravana Kannan con_dev = get_dev_from_fwnode(link->consumer); 1822f9aa4606SSaravana Kannan /* 1823f9aa4606SSaravana Kannan * If consumer device is not available yet, make a "proxy" 1824f9aa4606SSaravana Kannan * SYNC_STATE_ONLY link from the consumer's parent device to 1825f9aa4606SSaravana Kannan * the supplier device. This is necessary to make sure the 1826f9aa4606SSaravana Kannan * supplier doesn't get a sync_state() callback before the real 1827f9aa4606SSaravana Kannan * consumer can create a device link to the supplier. 1828f9aa4606SSaravana Kannan * 1829f9aa4606SSaravana Kannan * This proxy link step is needed to handle the case where the 1830f9aa4606SSaravana Kannan * consumer's parent device is added before the supplier. 1831f9aa4606SSaravana Kannan */ 1832f9aa4606SSaravana Kannan if (!con_dev) { 1833f9aa4606SSaravana Kannan con_dev = fwnode_get_next_parent_dev(link->consumer); 1834f9aa4606SSaravana Kannan /* 1835f9aa4606SSaravana Kannan * However, if the consumer's parent device is also the 1836f9aa4606SSaravana Kannan * parent of the supplier, don't create a 1837f9aa4606SSaravana Kannan * consumer-supplier link from the parent to its child 1838f9aa4606SSaravana Kannan * device. Such a dependency is impossible. 1839f9aa4606SSaravana Kannan */ 1840f9aa4606SSaravana Kannan if (con_dev && 1841f9aa4606SSaravana Kannan fwnode_is_ancestor_of(con_dev->fwnode, fwnode)) { 1842f9aa4606SSaravana Kannan put_device(con_dev); 1843f9aa4606SSaravana Kannan con_dev = NULL; 1844f9aa4606SSaravana Kannan } else { 1845f9aa4606SSaravana Kannan own_link = false; 1846b90fb8f6SSaravana Kannan dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE; 1847f9aa4606SSaravana Kannan } 1848f9aa4606SSaravana Kannan } 1849f9aa4606SSaravana Kannan 1850f9aa4606SSaravana Kannan if (!con_dev) 1851f9aa4606SSaravana Kannan continue; 1852f9aa4606SSaravana Kannan 1853f9aa4606SSaravana Kannan ret = fw_devlink_create_devlink(con_dev, fwnode, dl_flags); 1854f9aa4606SSaravana Kannan put_device(con_dev); 1855f9aa4606SSaravana Kannan if (!own_link || ret == -EAGAIN) 1856f9aa4606SSaravana Kannan continue; 1857f9aa4606SSaravana Kannan 1858f9aa4606SSaravana Kannan list_del(&link->s_hook); 1859f9aa4606SSaravana Kannan list_del(&link->c_hook); 1860f9aa4606SSaravana Kannan kfree(link); 1861f9aa4606SSaravana Kannan } 1862f9aa4606SSaravana Kannan } 1863f9aa4606SSaravana Kannan 1864f9aa4606SSaravana Kannan /** 1865f9aa4606SSaravana Kannan * __fw_devlink_link_to_suppliers - Create device links to suppliers of a device 186637c52f74SPierre-Louis Bossart * @dev: The consumer device that needs to be linked to its suppliers 186737c52f74SPierre-Louis Bossart * @fwnode: Root of the fwnode tree that is used to create device links 1868f9aa4606SSaravana Kannan * 1869f9aa4606SSaravana Kannan * This function looks at all the supplier fwnodes of fwnode tree rooted at 1870f9aa4606SSaravana Kannan * @fwnode and creates device links between @dev (consumer) and all the 1871f9aa4606SSaravana Kannan * supplier devices of the entire fwnode tree at @fwnode. 1872f9aa4606SSaravana Kannan * 1873f9aa4606SSaravana Kannan * The function creates normal (non-SYNC_STATE_ONLY) device links between @dev 1874f9aa4606SSaravana Kannan * and the real suppliers of @dev. Once these device links are created, the 1875f9aa4606SSaravana Kannan * fwnode links are deleted. When such device links are successfully created, 1876f9aa4606SSaravana Kannan * this function is called recursively on those supplier devices. This is 1877f9aa4606SSaravana Kannan * needed to detect and break some invalid cycles in fwnode links. See 1878f9aa4606SSaravana Kannan * fw_devlink_create_devlink() for more details. 1879f9aa4606SSaravana Kannan * 1880f9aa4606SSaravana Kannan * In addition, it also looks at all the suppliers of the entire fwnode tree 1881f9aa4606SSaravana Kannan * because some of the child devices of @dev that have not been added yet 1882f9aa4606SSaravana Kannan * (because @dev hasn't probed) might already have their suppliers added to 1883f9aa4606SSaravana Kannan * driver core. So, this function creates SYNC_STATE_ONLY device links between 1884f9aa4606SSaravana Kannan * @dev (consumer) and these suppliers to make sure they don't execute their 1885f9aa4606SSaravana Kannan * sync_state() callbacks before these child devices have a chance to create 1886f9aa4606SSaravana Kannan * their device links. The fwnode links that correspond to the child devices 1887f9aa4606SSaravana Kannan * aren't delete because they are needed later to create the device links 1888f9aa4606SSaravana Kannan * between the real consumer and supplier devices. 1889f9aa4606SSaravana Kannan */ 1890f9aa4606SSaravana Kannan static void __fw_devlink_link_to_suppliers(struct device *dev, 1891f9aa4606SSaravana Kannan struct fwnode_handle *fwnode) 1892f9aa4606SSaravana Kannan { 1893f9aa4606SSaravana Kannan bool own_link = (dev->fwnode == fwnode); 1894f9aa4606SSaravana Kannan struct fwnode_link *link, *tmp; 1895f9aa4606SSaravana Kannan struct fwnode_handle *child = NULL; 1896f9aa4606SSaravana Kannan u32 dl_flags; 1897f9aa4606SSaravana Kannan 1898f9aa4606SSaravana Kannan if (own_link) 1899f9aa4606SSaravana Kannan dl_flags = fw_devlink_get_flags(); 1900f9aa4606SSaravana Kannan else 1901b90fb8f6SSaravana Kannan dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE; 1902f9aa4606SSaravana Kannan 1903f9aa4606SSaravana Kannan list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) { 1904f9aa4606SSaravana Kannan int ret; 1905f9aa4606SSaravana Kannan struct device *sup_dev; 1906f9aa4606SSaravana Kannan struct fwnode_handle *sup = link->supplier; 1907f9aa4606SSaravana Kannan 1908f9aa4606SSaravana Kannan ret = fw_devlink_create_devlink(dev, sup, dl_flags); 1909f9aa4606SSaravana Kannan if (!own_link || ret == -EAGAIN) 1910f9aa4606SSaravana Kannan continue; 1911f9aa4606SSaravana Kannan 1912f9aa4606SSaravana Kannan list_del(&link->s_hook); 1913f9aa4606SSaravana Kannan list_del(&link->c_hook); 1914f9aa4606SSaravana Kannan kfree(link); 1915f9aa4606SSaravana Kannan 1916f9aa4606SSaravana Kannan /* If no device link was created, nothing more to do. */ 1917f9aa4606SSaravana Kannan if (ret) 1918f9aa4606SSaravana Kannan continue; 1919f9aa4606SSaravana Kannan 1920f9aa4606SSaravana Kannan /* 1921f9aa4606SSaravana Kannan * If a device link was successfully created to a supplier, we 1922f9aa4606SSaravana Kannan * now need to try and link the supplier to all its suppliers. 1923f9aa4606SSaravana Kannan * 1924f9aa4606SSaravana Kannan * This is needed to detect and delete false dependencies in 1925f9aa4606SSaravana Kannan * fwnode links that haven't been converted to a device link 1926f9aa4606SSaravana Kannan * yet. See comments in fw_devlink_create_devlink() for more 1927f9aa4606SSaravana Kannan * details on the false dependency. 1928f9aa4606SSaravana Kannan * 1929f9aa4606SSaravana Kannan * Without deleting these false dependencies, some devices will 1930f9aa4606SSaravana Kannan * never probe because they'll keep waiting for their false 1931f9aa4606SSaravana Kannan * dependency fwnode links to be converted to device links. 1932f9aa4606SSaravana Kannan */ 1933f9aa4606SSaravana Kannan sup_dev = get_dev_from_fwnode(sup); 1934f9aa4606SSaravana Kannan __fw_devlink_link_to_suppliers(sup_dev, sup_dev->fwnode); 1935f9aa4606SSaravana Kannan put_device(sup_dev); 1936f9aa4606SSaravana Kannan } 1937f9aa4606SSaravana Kannan 1938f9aa4606SSaravana Kannan /* 1939f9aa4606SSaravana Kannan * Make "proxy" SYNC_STATE_ONLY device links to represent the needs of 1940f9aa4606SSaravana Kannan * all the descendants. This proxy link step is needed to handle the 1941f9aa4606SSaravana Kannan * case where the supplier is added before the consumer's parent device 1942f9aa4606SSaravana Kannan * (@dev). 1943f9aa4606SSaravana Kannan */ 1944f9aa4606SSaravana Kannan while ((child = fwnode_get_next_available_child_node(fwnode, child))) 1945f9aa4606SSaravana Kannan __fw_devlink_link_to_suppliers(dev, child); 1946f9aa4606SSaravana Kannan } 1947f9aa4606SSaravana Kannan 19485f5377eaSSaravana Kannan static void fw_devlink_link_device(struct device *dev) 19495f5377eaSSaravana Kannan { 1950f9aa4606SSaravana Kannan struct fwnode_handle *fwnode = dev->fwnode; 19515f5377eaSSaravana Kannan 1952f9aa4606SSaravana Kannan if (!fw_devlink_flags) 1953f9aa4606SSaravana Kannan return; 19545f5377eaSSaravana Kannan 1955f9aa4606SSaravana Kannan fw_devlink_parse_fwtree(fwnode); 1956f9aa4606SSaravana Kannan 1957f9aa4606SSaravana Kannan mutex_lock(&fwnode_link_lock); 1958f9aa4606SSaravana Kannan __fw_devlink_link_to_consumers(dev); 1959f9aa4606SSaravana Kannan __fw_devlink_link_to_suppliers(dev, fwnode); 1960f9aa4606SSaravana Kannan mutex_unlock(&fwnode_link_lock); 19615f5377eaSSaravana Kannan } 19625f5377eaSSaravana Kannan 19639ed98953SRafael J. Wysocki /* Device links support end. */ 19649ed98953SRafael J. Wysocki 19651da177e4SLinus Torvalds int (*platform_notify)(struct device *dev) = NULL; 19661da177e4SLinus Torvalds int (*platform_notify_remove)(struct device *dev) = NULL; 1967e105b8bfSDan Williams static struct kobject *dev_kobj; 1968e105b8bfSDan Williams struct kobject *sysfs_dev_char_kobj; 1969e105b8bfSDan Williams struct kobject *sysfs_dev_block_kobj; 19701da177e4SLinus Torvalds 19715e33bc41SRafael J. Wysocki static DEFINE_MUTEX(device_hotplug_lock); 19725e33bc41SRafael J. Wysocki 19735e33bc41SRafael J. Wysocki void lock_device_hotplug(void) 19745e33bc41SRafael J. Wysocki { 19755e33bc41SRafael J. Wysocki mutex_lock(&device_hotplug_lock); 19765e33bc41SRafael J. Wysocki } 19775e33bc41SRafael J. Wysocki 19785e33bc41SRafael J. Wysocki void unlock_device_hotplug(void) 19795e33bc41SRafael J. Wysocki { 19805e33bc41SRafael J. Wysocki mutex_unlock(&device_hotplug_lock); 19815e33bc41SRafael J. Wysocki } 19825e33bc41SRafael J. Wysocki 19835e33bc41SRafael J. Wysocki int lock_device_hotplug_sysfs(void) 19845e33bc41SRafael J. Wysocki { 19855e33bc41SRafael J. Wysocki if (mutex_trylock(&device_hotplug_lock)) 19865e33bc41SRafael J. Wysocki return 0; 19875e33bc41SRafael J. Wysocki 19885e33bc41SRafael J. Wysocki /* Avoid busy looping (5 ms of sleep should do). */ 19895e33bc41SRafael J. Wysocki msleep(5); 19905e33bc41SRafael J. Wysocki return restart_syscall(); 19915e33bc41SRafael J. Wysocki } 19925e33bc41SRafael J. Wysocki 19934e886c29SGreg Kroah-Hartman #ifdef CONFIG_BLOCK 19944e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 19954e886c29SGreg Kroah-Hartman { 19964e886c29SGreg Kroah-Hartman return !(dev->type == &part_type); 19974e886c29SGreg Kroah-Hartman } 19984e886c29SGreg Kroah-Hartman #else 19994e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 20004e886c29SGreg Kroah-Hartman { 20014e886c29SGreg Kroah-Hartman return 1; 20024e886c29SGreg Kroah-Hartman } 20034e886c29SGreg Kroah-Hartman #endif 20041da177e4SLinus Torvalds 200507de0e86SHeikki Krogerus static int 200607de0e86SHeikki Krogerus device_platform_notify(struct device *dev, enum kobject_action action) 200707de0e86SHeikki Krogerus { 20087847a145SHeikki Krogerus int ret; 20097847a145SHeikki Krogerus 20107847a145SHeikki Krogerus ret = acpi_platform_notify(dev, action); 20117847a145SHeikki Krogerus if (ret) 20127847a145SHeikki Krogerus return ret; 20137847a145SHeikki Krogerus 201459abd836SHeikki Krogerus ret = software_node_notify(dev, action); 201559abd836SHeikki Krogerus if (ret) 201659abd836SHeikki Krogerus return ret; 201759abd836SHeikki Krogerus 201807de0e86SHeikki Krogerus if (platform_notify && action == KOBJ_ADD) 201907de0e86SHeikki Krogerus platform_notify(dev); 202007de0e86SHeikki Krogerus else if (platform_notify_remove && action == KOBJ_REMOVE) 202107de0e86SHeikki Krogerus platform_notify_remove(dev); 202207de0e86SHeikki Krogerus return 0; 202307de0e86SHeikki Krogerus } 202407de0e86SHeikki Krogerus 20253e95637aSAlan Stern /** 20263e95637aSAlan Stern * dev_driver_string - Return a device's driver name, if at all possible 20273e95637aSAlan Stern * @dev: struct device to get the name of 20283e95637aSAlan Stern * 20293e95637aSAlan Stern * Will return the device's driver's name if it is bound to a device. If 20309169c012Syan * the device is not bound to a driver, it will return the name of the bus 20313e95637aSAlan Stern * it is attached to. If it is not attached to a bus either, an empty 20323e95637aSAlan Stern * string will be returned. 20333e95637aSAlan Stern */ 2034bf9ca69fSJean Delvare const char *dev_driver_string(const struct device *dev) 20353e95637aSAlan Stern { 20363589972eSAlan Stern struct device_driver *drv; 20373589972eSAlan Stern 20383589972eSAlan Stern /* dev->driver can change to NULL underneath us because of unbinding, 20393589972eSAlan Stern * so be careful about accessing it. dev->bus and dev->class should 20403589972eSAlan Stern * never change once they are set, so they don't need special care. 20413589972eSAlan Stern */ 20426aa7de05SMark Rutland drv = READ_ONCE(dev->driver); 2043e020ff61SSaravana Kannan return drv ? drv->name : dev_bus_name(dev); 20443e95637aSAlan Stern } 2045310a922dSMatthew Wilcox EXPORT_SYMBOL(dev_driver_string); 20463e95637aSAlan Stern 20471da177e4SLinus Torvalds #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) 20481da177e4SLinus Torvalds 20494a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, 20504a3ad20cSGreg Kroah-Hartman char *buf) 20511da177e4SLinus Torvalds { 20521da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 2053b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 20544a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds if (dev_attr->show) 205754b6f35cSYani Ioannou ret = dev_attr->show(dev, dev_attr, buf); 2058815d2d50SAndrew Morton if (ret >= (ssize_t)PAGE_SIZE) { 2059a52668c6SSergey Senozhatsky printk("dev_attr_show: %pS returned bad count\n", 2060a52668c6SSergey Senozhatsky dev_attr->show); 2061815d2d50SAndrew Morton } 20621da177e4SLinus Torvalds return ret; 20631da177e4SLinus Torvalds } 20641da177e4SLinus Torvalds 20654a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, 20661da177e4SLinus Torvalds const char *buf, size_t count) 20671da177e4SLinus Torvalds { 20681da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 2069b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 20704a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 20711da177e4SLinus Torvalds 20721da177e4SLinus Torvalds if (dev_attr->store) 207354b6f35cSYani Ioannou ret = dev_attr->store(dev, dev_attr, buf, count); 20741da177e4SLinus Torvalds return ret; 20751da177e4SLinus Torvalds } 20761da177e4SLinus Torvalds 207752cf25d0SEmese Revfy static const struct sysfs_ops dev_sysfs_ops = { 20781da177e4SLinus Torvalds .show = dev_attr_show, 20791da177e4SLinus Torvalds .store = dev_attr_store, 20801da177e4SLinus Torvalds }; 20811da177e4SLinus Torvalds 2082ca22e56dSKay Sievers #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) 2083ca22e56dSKay Sievers 2084ca22e56dSKay Sievers ssize_t device_store_ulong(struct device *dev, 2085ca22e56dSKay Sievers struct device_attribute *attr, 2086ca22e56dSKay Sievers const char *buf, size_t size) 2087ca22e56dSKay Sievers { 2088ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 2089f88184bfSKaitao cheng int ret; 2090f88184bfSKaitao cheng unsigned long new; 2091f88184bfSKaitao cheng 2092f88184bfSKaitao cheng ret = kstrtoul(buf, 0, &new); 2093f88184bfSKaitao cheng if (ret) 2094f88184bfSKaitao cheng return ret; 2095ca22e56dSKay Sievers *(unsigned long *)(ea->var) = new; 2096ca22e56dSKay Sievers /* Always return full write size even if we didn't consume all */ 2097ca22e56dSKay Sievers return size; 2098ca22e56dSKay Sievers } 2099ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_store_ulong); 2100ca22e56dSKay Sievers 2101ca22e56dSKay Sievers ssize_t device_show_ulong(struct device *dev, 2102ca22e56dSKay Sievers struct device_attribute *attr, 2103ca22e56dSKay Sievers char *buf) 2104ca22e56dSKay Sievers { 2105ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 2106aa838896SJoe Perches return sysfs_emit(buf, "%lx\n", *(unsigned long *)(ea->var)); 2107ca22e56dSKay Sievers } 2108ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_show_ulong); 2109ca22e56dSKay Sievers 2110ca22e56dSKay Sievers ssize_t device_store_int(struct device *dev, 2111ca22e56dSKay Sievers struct device_attribute *attr, 2112ca22e56dSKay Sievers const char *buf, size_t size) 2113ca22e56dSKay Sievers { 2114ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 2115f88184bfSKaitao cheng int ret; 2116f88184bfSKaitao cheng long new; 2117f88184bfSKaitao cheng 2118f88184bfSKaitao cheng ret = kstrtol(buf, 0, &new); 2119f88184bfSKaitao cheng if (ret) 2120f88184bfSKaitao cheng return ret; 2121f88184bfSKaitao cheng 2122f88184bfSKaitao cheng if (new > INT_MAX || new < INT_MIN) 2123ca22e56dSKay Sievers return -EINVAL; 2124ca22e56dSKay Sievers *(int *)(ea->var) = new; 2125ca22e56dSKay Sievers /* Always return full write size even if we didn't consume all */ 2126ca22e56dSKay Sievers return size; 2127ca22e56dSKay Sievers } 2128ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_store_int); 2129ca22e56dSKay Sievers 2130ca22e56dSKay Sievers ssize_t device_show_int(struct device *dev, 2131ca22e56dSKay Sievers struct device_attribute *attr, 2132ca22e56dSKay Sievers char *buf) 2133ca22e56dSKay Sievers { 2134ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 2135ca22e56dSKay Sievers 2136aa838896SJoe Perches return sysfs_emit(buf, "%d\n", *(int *)(ea->var)); 2137ca22e56dSKay Sievers } 2138ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_show_int); 21391da177e4SLinus Torvalds 214091872392SBorislav Petkov ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, 214191872392SBorislav Petkov const char *buf, size_t size) 214291872392SBorislav Petkov { 214391872392SBorislav Petkov struct dev_ext_attribute *ea = to_ext_attr(attr); 214491872392SBorislav Petkov 214591872392SBorislav Petkov if (strtobool(buf, ea->var) < 0) 214691872392SBorislav Petkov return -EINVAL; 214791872392SBorislav Petkov 214891872392SBorislav Petkov return size; 214991872392SBorislav Petkov } 215091872392SBorislav Petkov EXPORT_SYMBOL_GPL(device_store_bool); 215191872392SBorislav Petkov 215291872392SBorislav Petkov ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, 215391872392SBorislav Petkov char *buf) 215491872392SBorislav Petkov { 215591872392SBorislav Petkov struct dev_ext_attribute *ea = to_ext_attr(attr); 215691872392SBorislav Petkov 2157aa838896SJoe Perches return sysfs_emit(buf, "%d\n", *(bool *)(ea->var)); 215891872392SBorislav Petkov } 215991872392SBorislav Petkov EXPORT_SYMBOL_GPL(device_show_bool); 216091872392SBorislav Petkov 21611da177e4SLinus Torvalds /** 21621da177e4SLinus Torvalds * device_release - free device structure. 21631da177e4SLinus Torvalds * @kobj: device's kobject. 21641da177e4SLinus Torvalds * 21651da177e4SLinus Torvalds * This is called once the reference count for the object 21661da177e4SLinus Torvalds * reaches 0. We forward the call to the device's release 21671da177e4SLinus Torvalds * method, which should handle actually freeing the structure. 21681da177e4SLinus Torvalds */ 21691da177e4SLinus Torvalds static void device_release(struct kobject *kobj) 21701da177e4SLinus Torvalds { 2171b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 2172fb069a5dSGreg Kroah-Hartman struct device_private *p = dev->p; 21731da177e4SLinus Torvalds 2174a525a3ddSMing Lei /* 2175a525a3ddSMing Lei * Some platform devices are driven without driver attached 2176a525a3ddSMing Lei * and managed resources may have been acquired. Make sure 2177a525a3ddSMing Lei * all resources are released. 2178a525a3ddSMing Lei * 2179a525a3ddSMing Lei * Drivers still can add resources into device after device 2180a525a3ddSMing Lei * is deleted but alive, so release devres here to avoid 2181a525a3ddSMing Lei * possible memory leak. 2182a525a3ddSMing Lei */ 2183a525a3ddSMing Lei devres_release_all(dev); 2184a525a3ddSMing Lei 2185e0d07278SJim Quinlan kfree(dev->dma_range_map); 2186e0d07278SJim Quinlan 21871da177e4SLinus Torvalds if (dev->release) 21881da177e4SLinus Torvalds dev->release(dev); 2189f9f852dfSKay Sievers else if (dev->type && dev->type->release) 2190f9f852dfSKay Sievers dev->type->release(dev); 21912620efefSGreg Kroah-Hartman else if (dev->class && dev->class->dev_release) 21922620efefSGreg Kroah-Hartman dev->class->dev_release(dev); 2193f810a5cfSArjan van de Ven else 21940c1bc6b8SMauro Carvalho Chehab WARN(1, KERN_ERR "Device '%s' does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.\n", 21951e0b2cf9SKay Sievers dev_name(dev)); 2196fb069a5dSGreg Kroah-Hartman kfree(p); 21971da177e4SLinus Torvalds } 21981da177e4SLinus Torvalds 2199bc451f20SEric W. Biederman static const void *device_namespace(struct kobject *kobj) 2200bc451f20SEric W. Biederman { 2201b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 2202bc451f20SEric W. Biederman const void *ns = NULL; 2203bc451f20SEric W. Biederman 2204bc451f20SEric W. Biederman if (dev->class && dev->class->ns_type) 2205bc451f20SEric W. Biederman ns = dev->class->namespace(dev); 2206bc451f20SEric W. Biederman 2207bc451f20SEric W. Biederman return ns; 2208bc451f20SEric W. Biederman } 2209bc451f20SEric W. Biederman 22109944e894SDmitry Torokhov static void device_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) 22119944e894SDmitry Torokhov { 22129944e894SDmitry Torokhov struct device *dev = kobj_to_dev(kobj); 22139944e894SDmitry Torokhov 22149944e894SDmitry Torokhov if (dev->class && dev->class->get_ownership) 22159944e894SDmitry Torokhov dev->class->get_ownership(dev, uid, gid); 22169944e894SDmitry Torokhov } 22179944e894SDmitry Torokhov 22188f4afc41SGreg Kroah-Hartman static struct kobj_type device_ktype = { 22191da177e4SLinus Torvalds .release = device_release, 22201da177e4SLinus Torvalds .sysfs_ops = &dev_sysfs_ops, 2221bc451f20SEric W. Biederman .namespace = device_namespace, 22229944e894SDmitry Torokhov .get_ownership = device_get_ownership, 22231da177e4SLinus Torvalds }; 22241da177e4SLinus Torvalds 22251da177e4SLinus Torvalds 2226312c004dSKay Sievers static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) 22271da177e4SLinus Torvalds { 22281da177e4SLinus Torvalds struct kobj_type *ktype = get_ktype(kobj); 22291da177e4SLinus Torvalds 22308f4afc41SGreg Kroah-Hartman if (ktype == &device_ktype) { 2231b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 22321da177e4SLinus Torvalds if (dev->bus) 22331da177e4SLinus Torvalds return 1; 223423681e47SGreg Kroah-Hartman if (dev->class) 223523681e47SGreg Kroah-Hartman return 1; 22361da177e4SLinus Torvalds } 22371da177e4SLinus Torvalds return 0; 22381da177e4SLinus Torvalds } 22391da177e4SLinus Torvalds 2240312c004dSKay Sievers static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) 22411da177e4SLinus Torvalds { 2242b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 22431da177e4SLinus Torvalds 224423681e47SGreg Kroah-Hartman if (dev->bus) 22451da177e4SLinus Torvalds return dev->bus->name; 224623681e47SGreg Kroah-Hartman if (dev->class) 224723681e47SGreg Kroah-Hartman return dev->class->name; 224823681e47SGreg Kroah-Hartman return NULL; 22491da177e4SLinus Torvalds } 22501da177e4SLinus Torvalds 22517eff2e7aSKay Sievers static int dev_uevent(struct kset *kset, struct kobject *kobj, 22527eff2e7aSKay Sievers struct kobj_uevent_env *env) 22531da177e4SLinus Torvalds { 2254b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 22551da177e4SLinus Torvalds int retval = 0; 22561da177e4SLinus Torvalds 22576fcf53acSKay Sievers /* add device node properties if present */ 225823681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 22596fcf53acSKay Sievers const char *tmp; 22606fcf53acSKay Sievers const char *name; 22612c9ede55SAl Viro umode_t mode = 0; 22624e4098a3SGreg Kroah-Hartman kuid_t uid = GLOBAL_ROOT_UID; 22634e4098a3SGreg Kroah-Hartman kgid_t gid = GLOBAL_ROOT_GID; 22646fcf53acSKay Sievers 22657eff2e7aSKay Sievers add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); 22667eff2e7aSKay Sievers add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); 22673c2670e6SKay Sievers name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); 22686fcf53acSKay Sievers if (name) { 22696fcf53acSKay Sievers add_uevent_var(env, "DEVNAME=%s", name); 2270e454cea2SKay Sievers if (mode) 2271e454cea2SKay Sievers add_uevent_var(env, "DEVMODE=%#o", mode & 0777); 22724e4098a3SGreg Kroah-Hartman if (!uid_eq(uid, GLOBAL_ROOT_UID)) 22734e4098a3SGreg Kroah-Hartman add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); 22744e4098a3SGreg Kroah-Hartman if (!gid_eq(gid, GLOBAL_ROOT_GID)) 22754e4098a3SGreg Kroah-Hartman add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); 22763c2670e6SKay Sievers kfree(tmp); 22776fcf53acSKay Sievers } 227823681e47SGreg Kroah-Hartman } 227923681e47SGreg Kroah-Hartman 2280414264f9SKay Sievers if (dev->type && dev->type->name) 22817eff2e7aSKay Sievers add_uevent_var(env, "DEVTYPE=%s", dev->type->name); 2282414264f9SKay Sievers 2283239378f1SKay Sievers if (dev->driver) 22847eff2e7aSKay Sievers add_uevent_var(env, "DRIVER=%s", dev->driver->name); 2285239378f1SKay Sievers 228607d57a32SGrant Likely /* Add common DT information about the device */ 228707d57a32SGrant Likely of_device_uevent(dev, env); 228807d57a32SGrant Likely 22891da177e4SLinus Torvalds /* have the bus specific function add its stuff */ 22907eff2e7aSKay Sievers if (dev->bus && dev->bus->uevent) { 22917eff2e7aSKay Sievers retval = dev->bus->uevent(dev, env); 2292f9f852dfSKay Sievers if (retval) 22937dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: bus uevent() returned %d\n", 22941e0b2cf9SKay Sievers dev_name(dev), __func__, retval); 22951da177e4SLinus Torvalds } 22961da177e4SLinus Torvalds 22972620efefSGreg Kroah-Hartman /* have the class specific function add its stuff */ 22987eff2e7aSKay Sievers if (dev->class && dev->class->dev_uevent) { 22997eff2e7aSKay Sievers retval = dev->class->dev_uevent(dev, env); 2300f9f852dfSKay Sievers if (retval) 23017dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: class uevent() " 23021e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 23032b3a302aSHarvey Harrison __func__, retval); 23042620efefSGreg Kroah-Hartman } 2305f9f852dfSKay Sievers 2306eef35c2dSStefan Weil /* have the device type specific function add its stuff */ 23077eff2e7aSKay Sievers if (dev->type && dev->type->uevent) { 23087eff2e7aSKay Sievers retval = dev->type->uevent(dev, env); 2309f9f852dfSKay Sievers if (retval) 23107dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: dev_type uevent() " 23111e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 23122b3a302aSHarvey Harrison __func__, retval); 23132620efefSGreg Kroah-Hartman } 23142620efefSGreg Kroah-Hartman 23151da177e4SLinus Torvalds return retval; 23161da177e4SLinus Torvalds } 23171da177e4SLinus Torvalds 23189cd43611SEmese Revfy static const struct kset_uevent_ops device_uevent_ops = { 2319312c004dSKay Sievers .filter = dev_uevent_filter, 2320312c004dSKay Sievers .name = dev_uevent_name, 2321312c004dSKay Sievers .uevent = dev_uevent, 23221da177e4SLinus Torvalds }; 23231da177e4SLinus Torvalds 2324c5e064a6SGreg Kroah-Hartman static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, 232516574dccSKay Sievers char *buf) 232616574dccSKay Sievers { 232716574dccSKay Sievers struct kobject *top_kobj; 232816574dccSKay Sievers struct kset *kset; 23297eff2e7aSKay Sievers struct kobj_uevent_env *env = NULL; 233016574dccSKay Sievers int i; 2331948b3edbSJoe Perches int len = 0; 233216574dccSKay Sievers int retval; 233316574dccSKay Sievers 233416574dccSKay Sievers /* search the kset, the device belongs to */ 233516574dccSKay Sievers top_kobj = &dev->kobj; 23365c5daf65SKay Sievers while (!top_kobj->kset && top_kobj->parent) 233716574dccSKay Sievers top_kobj = top_kobj->parent; 233816574dccSKay Sievers if (!top_kobj->kset) 233916574dccSKay Sievers goto out; 23405c5daf65SKay Sievers 234116574dccSKay Sievers kset = top_kobj->kset; 234216574dccSKay Sievers if (!kset->uevent_ops || !kset->uevent_ops->uevent) 234316574dccSKay Sievers goto out; 234416574dccSKay Sievers 234516574dccSKay Sievers /* respect filter */ 234616574dccSKay Sievers if (kset->uevent_ops && kset->uevent_ops->filter) 234716574dccSKay Sievers if (!kset->uevent_ops->filter(kset, &dev->kobj)) 234816574dccSKay Sievers goto out; 234916574dccSKay Sievers 23507eff2e7aSKay Sievers env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 23517eff2e7aSKay Sievers if (!env) 2352c7308c81SGreg Kroah-Hartman return -ENOMEM; 2353c7308c81SGreg Kroah-Hartman 235416574dccSKay Sievers /* let the kset specific function add its keys */ 23557eff2e7aSKay Sievers retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); 235616574dccSKay Sievers if (retval) 235716574dccSKay Sievers goto out; 235816574dccSKay Sievers 235916574dccSKay Sievers /* copy keys to file */ 23607eff2e7aSKay Sievers for (i = 0; i < env->envp_idx; i++) 2361948b3edbSJoe Perches len += sysfs_emit_at(buf, len, "%s\n", env->envp[i]); 236216574dccSKay Sievers out: 23637eff2e7aSKay Sievers kfree(env); 2364948b3edbSJoe Perches return len; 236516574dccSKay Sievers } 236616574dccSKay Sievers 2367c5e064a6SGreg Kroah-Hartman static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, 2368a7fd6706SKay Sievers const char *buf, size_t count) 2369a7fd6706SKay Sievers { 2370df44b479SPeter Rajnoha int rc; 2371df44b479SPeter Rajnoha 2372df44b479SPeter Rajnoha rc = kobject_synth_uevent(&dev->kobj, buf, count); 2373df44b479SPeter Rajnoha 2374df44b479SPeter Rajnoha if (rc) { 2375f36776faSPeter Rajnoha dev_err(dev, "uevent: failed to send synthetic uevent\n"); 2376df44b479SPeter Rajnoha return rc; 2377df44b479SPeter Rajnoha } 237860a96a59SKay Sievers 2379a7fd6706SKay Sievers return count; 2380a7fd6706SKay Sievers } 2381c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RW(uevent); 2382a7fd6706SKay Sievers 2383c5e064a6SGreg Kroah-Hartman static ssize_t online_show(struct device *dev, struct device_attribute *attr, 23844f3549d7SRafael J. Wysocki char *buf) 23854f3549d7SRafael J. Wysocki { 23864f3549d7SRafael J. Wysocki bool val; 23874f3549d7SRafael J. Wysocki 23885e33bc41SRafael J. Wysocki device_lock(dev); 23894f3549d7SRafael J. Wysocki val = !dev->offline; 23905e33bc41SRafael J. Wysocki device_unlock(dev); 2391aa838896SJoe Perches return sysfs_emit(buf, "%u\n", val); 23924f3549d7SRafael J. Wysocki } 23934f3549d7SRafael J. Wysocki 2394c5e064a6SGreg Kroah-Hartman static ssize_t online_store(struct device *dev, struct device_attribute *attr, 23954f3549d7SRafael J. Wysocki const char *buf, size_t count) 23964f3549d7SRafael J. Wysocki { 23974f3549d7SRafael J. Wysocki bool val; 23984f3549d7SRafael J. Wysocki int ret; 23994f3549d7SRafael J. Wysocki 24004f3549d7SRafael J. Wysocki ret = strtobool(buf, &val); 24014f3549d7SRafael J. Wysocki if (ret < 0) 24024f3549d7SRafael J. Wysocki return ret; 24034f3549d7SRafael J. Wysocki 24045e33bc41SRafael J. Wysocki ret = lock_device_hotplug_sysfs(); 24055e33bc41SRafael J. Wysocki if (ret) 24065e33bc41SRafael J. Wysocki return ret; 24075e33bc41SRafael J. Wysocki 24084f3549d7SRafael J. Wysocki ret = val ? device_online(dev) : device_offline(dev); 24094f3549d7SRafael J. Wysocki unlock_device_hotplug(); 24104f3549d7SRafael J. Wysocki return ret < 0 ? ret : count; 24114f3549d7SRafael J. Wysocki } 2412c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RW(online); 24134f3549d7SRafael J. Wysocki 241470f400d4SRajat Jain static ssize_t removable_show(struct device *dev, struct device_attribute *attr, 241570f400d4SRajat Jain char *buf) 241670f400d4SRajat Jain { 241770f400d4SRajat Jain const char *loc; 241870f400d4SRajat Jain 241970f400d4SRajat Jain switch (dev->removable) { 242070f400d4SRajat Jain case DEVICE_REMOVABLE: 242170f400d4SRajat Jain loc = "removable"; 242270f400d4SRajat Jain break; 242370f400d4SRajat Jain case DEVICE_FIXED: 242470f400d4SRajat Jain loc = "fixed"; 242570f400d4SRajat Jain break; 242670f400d4SRajat Jain default: 242770f400d4SRajat Jain loc = "unknown"; 242870f400d4SRajat Jain } 242970f400d4SRajat Jain return sysfs_emit(buf, "%s\n", loc); 243070f400d4SRajat Jain } 243170f400d4SRajat Jain static DEVICE_ATTR_RO(removable); 243270f400d4SRajat Jain 2433fa6fdb33SGreg Kroah-Hartman int device_add_groups(struct device *dev, const struct attribute_group **groups) 2434621a1672SDmitry Torokhov { 24353e9b2baeSGreg Kroah-Hartman return sysfs_create_groups(&dev->kobj, groups); 2436621a1672SDmitry Torokhov } 2437a7670d42SDmitry Torokhov EXPORT_SYMBOL_GPL(device_add_groups); 2438621a1672SDmitry Torokhov 2439fa6fdb33SGreg Kroah-Hartman void device_remove_groups(struct device *dev, 2440a4dbd674SDavid Brownell const struct attribute_group **groups) 2441621a1672SDmitry Torokhov { 24423e9b2baeSGreg Kroah-Hartman sysfs_remove_groups(&dev->kobj, groups); 2443621a1672SDmitry Torokhov } 2444a7670d42SDmitry Torokhov EXPORT_SYMBOL_GPL(device_remove_groups); 2445de0ff00dSGreg Kroah-Hartman 244657b8ff07SDmitry Torokhov union device_attr_group_devres { 244757b8ff07SDmitry Torokhov const struct attribute_group *group; 244857b8ff07SDmitry Torokhov const struct attribute_group **groups; 244957b8ff07SDmitry Torokhov }; 245057b8ff07SDmitry Torokhov 245157b8ff07SDmitry Torokhov static int devm_attr_group_match(struct device *dev, void *res, void *data) 245257b8ff07SDmitry Torokhov { 245357b8ff07SDmitry Torokhov return ((union device_attr_group_devres *)res)->group == data; 245457b8ff07SDmitry Torokhov } 245557b8ff07SDmitry Torokhov 245657b8ff07SDmitry Torokhov static void devm_attr_group_remove(struct device *dev, void *res) 245757b8ff07SDmitry Torokhov { 245857b8ff07SDmitry Torokhov union device_attr_group_devres *devres = res; 245957b8ff07SDmitry Torokhov const struct attribute_group *group = devres->group; 246057b8ff07SDmitry Torokhov 246157b8ff07SDmitry Torokhov dev_dbg(dev, "%s: removing group %p\n", __func__, group); 246257b8ff07SDmitry Torokhov sysfs_remove_group(&dev->kobj, group); 246357b8ff07SDmitry Torokhov } 246457b8ff07SDmitry Torokhov 246557b8ff07SDmitry Torokhov static void devm_attr_groups_remove(struct device *dev, void *res) 246657b8ff07SDmitry Torokhov { 246757b8ff07SDmitry Torokhov union device_attr_group_devres *devres = res; 246857b8ff07SDmitry Torokhov const struct attribute_group **groups = devres->groups; 246957b8ff07SDmitry Torokhov 247057b8ff07SDmitry Torokhov dev_dbg(dev, "%s: removing groups %p\n", __func__, groups); 247157b8ff07SDmitry Torokhov sysfs_remove_groups(&dev->kobj, groups); 247257b8ff07SDmitry Torokhov } 247357b8ff07SDmitry Torokhov 247457b8ff07SDmitry Torokhov /** 247557b8ff07SDmitry Torokhov * devm_device_add_group - given a device, create a managed attribute group 247657b8ff07SDmitry Torokhov * @dev: The device to create the group for 247757b8ff07SDmitry Torokhov * @grp: The attribute group to create 247857b8ff07SDmitry Torokhov * 247957b8ff07SDmitry Torokhov * This function creates a group for the first time. It will explicitly 248057b8ff07SDmitry Torokhov * warn and error if any of the attribute files being created already exist. 248157b8ff07SDmitry Torokhov * 248257b8ff07SDmitry Torokhov * Returns 0 on success or error code on failure. 248357b8ff07SDmitry Torokhov */ 248457b8ff07SDmitry Torokhov int devm_device_add_group(struct device *dev, const struct attribute_group *grp) 248557b8ff07SDmitry Torokhov { 248657b8ff07SDmitry Torokhov union device_attr_group_devres *devres; 248757b8ff07SDmitry Torokhov int error; 248857b8ff07SDmitry Torokhov 248957b8ff07SDmitry Torokhov devres = devres_alloc(devm_attr_group_remove, 249057b8ff07SDmitry Torokhov sizeof(*devres), GFP_KERNEL); 249157b8ff07SDmitry Torokhov if (!devres) 249257b8ff07SDmitry Torokhov return -ENOMEM; 249357b8ff07SDmitry Torokhov 249457b8ff07SDmitry Torokhov error = sysfs_create_group(&dev->kobj, grp); 249557b8ff07SDmitry Torokhov if (error) { 249657b8ff07SDmitry Torokhov devres_free(devres); 249757b8ff07SDmitry Torokhov return error; 249857b8ff07SDmitry Torokhov } 249957b8ff07SDmitry Torokhov 250057b8ff07SDmitry Torokhov devres->group = grp; 250157b8ff07SDmitry Torokhov devres_add(dev, devres); 250257b8ff07SDmitry Torokhov return 0; 250357b8ff07SDmitry Torokhov } 250457b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_add_group); 250557b8ff07SDmitry Torokhov 250657b8ff07SDmitry Torokhov /** 250757b8ff07SDmitry Torokhov * devm_device_remove_group: remove a managed group from a device 250857b8ff07SDmitry Torokhov * @dev: device to remove the group from 250957b8ff07SDmitry Torokhov * @grp: group to remove 251057b8ff07SDmitry Torokhov * 251157b8ff07SDmitry Torokhov * This function removes a group of attributes from a device. The attributes 251257b8ff07SDmitry Torokhov * previously have to have been created for this group, otherwise it will fail. 251357b8ff07SDmitry Torokhov */ 251457b8ff07SDmitry Torokhov void devm_device_remove_group(struct device *dev, 251557b8ff07SDmitry Torokhov const struct attribute_group *grp) 251657b8ff07SDmitry Torokhov { 251757b8ff07SDmitry Torokhov WARN_ON(devres_release(dev, devm_attr_group_remove, 251857b8ff07SDmitry Torokhov devm_attr_group_match, 251957b8ff07SDmitry Torokhov /* cast away const */ (void *)grp)); 252057b8ff07SDmitry Torokhov } 252157b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_remove_group); 252257b8ff07SDmitry Torokhov 252357b8ff07SDmitry Torokhov /** 252457b8ff07SDmitry Torokhov * devm_device_add_groups - create a bunch of managed attribute groups 252557b8ff07SDmitry Torokhov * @dev: The device to create the group for 252657b8ff07SDmitry Torokhov * @groups: The attribute groups to create, NULL terminated 252757b8ff07SDmitry Torokhov * 252857b8ff07SDmitry Torokhov * This function creates a bunch of managed attribute groups. If an error 252957b8ff07SDmitry Torokhov * occurs when creating a group, all previously created groups will be 253057b8ff07SDmitry Torokhov * removed, unwinding everything back to the original state when this 253157b8ff07SDmitry Torokhov * function was called. It will explicitly warn and error if any of the 253257b8ff07SDmitry Torokhov * attribute files being created already exist. 253357b8ff07SDmitry Torokhov * 253457b8ff07SDmitry Torokhov * Returns 0 on success or error code from sysfs_create_group on failure. 253557b8ff07SDmitry Torokhov */ 253657b8ff07SDmitry Torokhov int devm_device_add_groups(struct device *dev, 253757b8ff07SDmitry Torokhov const struct attribute_group **groups) 253857b8ff07SDmitry Torokhov { 253957b8ff07SDmitry Torokhov union device_attr_group_devres *devres; 254057b8ff07SDmitry Torokhov int error; 254157b8ff07SDmitry Torokhov 254257b8ff07SDmitry Torokhov devres = devres_alloc(devm_attr_groups_remove, 254357b8ff07SDmitry Torokhov sizeof(*devres), GFP_KERNEL); 254457b8ff07SDmitry Torokhov if (!devres) 254557b8ff07SDmitry Torokhov return -ENOMEM; 254657b8ff07SDmitry Torokhov 254757b8ff07SDmitry Torokhov error = sysfs_create_groups(&dev->kobj, groups); 254857b8ff07SDmitry Torokhov if (error) { 254957b8ff07SDmitry Torokhov devres_free(devres); 255057b8ff07SDmitry Torokhov return error; 255157b8ff07SDmitry Torokhov } 255257b8ff07SDmitry Torokhov 255357b8ff07SDmitry Torokhov devres->groups = groups; 255457b8ff07SDmitry Torokhov devres_add(dev, devres); 255557b8ff07SDmitry Torokhov return 0; 255657b8ff07SDmitry Torokhov } 255757b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_add_groups); 255857b8ff07SDmitry Torokhov 255957b8ff07SDmitry Torokhov /** 256057b8ff07SDmitry Torokhov * devm_device_remove_groups - remove a list of managed groups 256157b8ff07SDmitry Torokhov * 256257b8ff07SDmitry Torokhov * @dev: The device for the groups to be removed from 256357b8ff07SDmitry Torokhov * @groups: NULL terminated list of groups to be removed 256457b8ff07SDmitry Torokhov * 256557b8ff07SDmitry Torokhov * If groups is not NULL, remove the specified groups from the device. 256657b8ff07SDmitry Torokhov */ 256757b8ff07SDmitry Torokhov void devm_device_remove_groups(struct device *dev, 256857b8ff07SDmitry Torokhov const struct attribute_group **groups) 256957b8ff07SDmitry Torokhov { 257057b8ff07SDmitry Torokhov WARN_ON(devres_release(dev, devm_attr_groups_remove, 257157b8ff07SDmitry Torokhov devm_attr_group_match, 257257b8ff07SDmitry Torokhov /* cast away const */ (void *)groups)); 257357b8ff07SDmitry Torokhov } 257457b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_remove_groups); 25751da177e4SLinus Torvalds 25762620efefSGreg Kroah-Hartman static int device_add_attrs(struct device *dev) 25772620efefSGreg Kroah-Hartman { 25782620efefSGreg Kroah-Hartman struct class *class = dev->class; 2579aed65af1SStephen Hemminger const struct device_type *type = dev->type; 2580621a1672SDmitry Torokhov int error; 25812620efefSGreg Kroah-Hartman 2582621a1672SDmitry Torokhov if (class) { 2583d05a6f96SGreg Kroah-Hartman error = device_add_groups(dev, class->dev_groups); 25842620efefSGreg Kroah-Hartman if (error) 2585621a1672SDmitry Torokhov return error; 2586f9f852dfSKay Sievers } 2587f9f852dfSKay Sievers 2588621a1672SDmitry Torokhov if (type) { 2589621a1672SDmitry Torokhov error = device_add_groups(dev, type->groups); 2590f9f852dfSKay Sievers if (error) 2591a6b01dedSGreg Kroah-Hartman goto err_remove_class_groups; 2592f9f852dfSKay Sievers } 2593621a1672SDmitry Torokhov 2594621a1672SDmitry Torokhov error = device_add_groups(dev, dev->groups); 2595f9f852dfSKay Sievers if (error) 2596621a1672SDmitry Torokhov goto err_remove_type_groups; 2597621a1672SDmitry Torokhov 25984f3549d7SRafael J. Wysocki if (device_supports_offline(dev) && !dev->offline_disabled) { 2599c5e064a6SGreg Kroah-Hartman error = device_create_file(dev, &dev_attr_online); 26004f3549d7SRafael J. Wysocki if (error) 2601ecfbf6fdSRafael J. Wysocki goto err_remove_dev_groups; 26024f3549d7SRafael J. Wysocki } 26034f3549d7SRafael J. Wysocki 260425ac86c6SSaravana Kannan if (fw_devlink_flags && !fw_devlink_is_permissive() && dev->fwnode) { 2605da6d6475SSaravana Kannan error = device_create_file(dev, &dev_attr_waiting_for_supplier); 2606da6d6475SSaravana Kannan if (error) 2607da6d6475SSaravana Kannan goto err_remove_dev_online; 2608da6d6475SSaravana Kannan } 2609da6d6475SSaravana Kannan 261070f400d4SRajat Jain if (dev_removable_is_valid(dev)) { 261170f400d4SRajat Jain error = device_create_file(dev, &dev_attr_removable); 261270f400d4SRajat Jain if (error) 261370f400d4SRajat Jain goto err_remove_dev_waiting_for_supplier; 261470f400d4SRajat Jain } 261570f400d4SRajat Jain 2616621a1672SDmitry Torokhov return 0; 2617621a1672SDmitry Torokhov 261870f400d4SRajat Jain err_remove_dev_waiting_for_supplier: 261970f400d4SRajat Jain device_remove_file(dev, &dev_attr_waiting_for_supplier); 2620da6d6475SSaravana Kannan err_remove_dev_online: 2621da6d6475SSaravana Kannan device_remove_file(dev, &dev_attr_online); 2622ecfbf6fdSRafael J. Wysocki err_remove_dev_groups: 2623ecfbf6fdSRafael J. Wysocki device_remove_groups(dev, dev->groups); 2624621a1672SDmitry Torokhov err_remove_type_groups: 2625621a1672SDmitry Torokhov if (type) 2626621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 2627d05a6f96SGreg Kroah-Hartman err_remove_class_groups: 2628d05a6f96SGreg Kroah-Hartman if (class) 2629d05a6f96SGreg Kroah-Hartman device_remove_groups(dev, class->dev_groups); 2630f9f852dfSKay Sievers 26312620efefSGreg Kroah-Hartman return error; 26322620efefSGreg Kroah-Hartman } 26332620efefSGreg Kroah-Hartman 26342620efefSGreg Kroah-Hartman static void device_remove_attrs(struct device *dev) 26352620efefSGreg Kroah-Hartman { 26362620efefSGreg Kroah-Hartman struct class *class = dev->class; 2637aed65af1SStephen Hemminger const struct device_type *type = dev->type; 26382620efefSGreg Kroah-Hartman 263970f400d4SRajat Jain device_remove_file(dev, &dev_attr_removable); 2640da6d6475SSaravana Kannan device_remove_file(dev, &dev_attr_waiting_for_supplier); 2641c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_online); 2642621a1672SDmitry Torokhov device_remove_groups(dev, dev->groups); 2643f9f852dfSKay Sievers 2644621a1672SDmitry Torokhov if (type) 2645621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 2646621a1672SDmitry Torokhov 2647a6b01dedSGreg Kroah-Hartman if (class) 2648d05a6f96SGreg Kroah-Hartman device_remove_groups(dev, class->dev_groups); 2649c97415a7SStefan Achatz } 26502620efefSGreg Kroah-Hartman 2651c5e064a6SGreg Kroah-Hartman static ssize_t dev_show(struct device *dev, struct device_attribute *attr, 265223681e47SGreg Kroah-Hartman char *buf) 265323681e47SGreg Kroah-Hartman { 265423681e47SGreg Kroah-Hartman return print_dev_t(buf, dev->devt); 265523681e47SGreg Kroah-Hartman } 2656c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RO(dev); 2657ad6a1e1cSTejun Heo 2658ca22e56dSKay Sievers /* /sys/devices/ */ 2659881c6cfdSGreg Kroah-Hartman struct kset *devices_kset; 26601da177e4SLinus Torvalds 26611da177e4SLinus Torvalds /** 266252cdbdd4SGrygorii Strashko * devices_kset_move_before - Move device in the devices_kset's list. 266352cdbdd4SGrygorii Strashko * @deva: Device to move. 266452cdbdd4SGrygorii Strashko * @devb: Device @deva should come before. 266552cdbdd4SGrygorii Strashko */ 266652cdbdd4SGrygorii Strashko static void devices_kset_move_before(struct device *deva, struct device *devb) 266752cdbdd4SGrygorii Strashko { 266852cdbdd4SGrygorii Strashko if (!devices_kset) 266952cdbdd4SGrygorii Strashko return; 267052cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s before %s\n", 267152cdbdd4SGrygorii Strashko dev_name(deva), dev_name(devb)); 267252cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 267352cdbdd4SGrygorii Strashko list_move_tail(&deva->kobj.entry, &devb->kobj.entry); 267452cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 267552cdbdd4SGrygorii Strashko } 267652cdbdd4SGrygorii Strashko 267752cdbdd4SGrygorii Strashko /** 267852cdbdd4SGrygorii Strashko * devices_kset_move_after - Move device in the devices_kset's list. 267952cdbdd4SGrygorii Strashko * @deva: Device to move 268052cdbdd4SGrygorii Strashko * @devb: Device @deva should come after. 268152cdbdd4SGrygorii Strashko */ 268252cdbdd4SGrygorii Strashko static void devices_kset_move_after(struct device *deva, struct device *devb) 268352cdbdd4SGrygorii Strashko { 268452cdbdd4SGrygorii Strashko if (!devices_kset) 268552cdbdd4SGrygorii Strashko return; 268652cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s after %s\n", 268752cdbdd4SGrygorii Strashko dev_name(deva), dev_name(devb)); 268852cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 268952cdbdd4SGrygorii Strashko list_move(&deva->kobj.entry, &devb->kobj.entry); 269052cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 269152cdbdd4SGrygorii Strashko } 269252cdbdd4SGrygorii Strashko 269352cdbdd4SGrygorii Strashko /** 269452cdbdd4SGrygorii Strashko * devices_kset_move_last - move the device to the end of devices_kset's list. 269552cdbdd4SGrygorii Strashko * @dev: device to move 269652cdbdd4SGrygorii Strashko */ 269752cdbdd4SGrygorii Strashko void devices_kset_move_last(struct device *dev) 269852cdbdd4SGrygorii Strashko { 269952cdbdd4SGrygorii Strashko if (!devices_kset) 270052cdbdd4SGrygorii Strashko return; 270152cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); 270252cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 270352cdbdd4SGrygorii Strashko list_move_tail(&dev->kobj.entry, &devices_kset->list); 270452cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 270552cdbdd4SGrygorii Strashko } 270652cdbdd4SGrygorii Strashko 270752cdbdd4SGrygorii Strashko /** 27081da177e4SLinus Torvalds * device_create_file - create sysfs attribute file for device. 27091da177e4SLinus Torvalds * @dev: device. 27101da177e4SLinus Torvalds * @attr: device attribute descriptor. 27111da177e4SLinus Torvalds */ 271226579ab7SPhil Carmody int device_create_file(struct device *dev, 271326579ab7SPhil Carmody const struct device_attribute *attr) 27141da177e4SLinus Torvalds { 27151da177e4SLinus Torvalds int error = 0; 27168f46baaaSFelipe Balbi 27178f46baaaSFelipe Balbi if (dev) { 27188f46baaaSFelipe Balbi WARN(((attr->attr.mode & S_IWUGO) && !attr->store), 271997521978Sdyoung@redhat.com "Attribute %s: write permission without 'store'\n", 272097521978Sdyoung@redhat.com attr->attr.name); 27218f46baaaSFelipe Balbi WARN(((attr->attr.mode & S_IRUGO) && !attr->show), 272297521978Sdyoung@redhat.com "Attribute %s: read permission without 'show'\n", 272397521978Sdyoung@redhat.com attr->attr.name); 27241da177e4SLinus Torvalds error = sysfs_create_file(&dev->kobj, &attr->attr); 27258f46baaaSFelipe Balbi } 27268f46baaaSFelipe Balbi 27271da177e4SLinus Torvalds return error; 27281da177e4SLinus Torvalds } 272986df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_create_file); 27301da177e4SLinus Torvalds 27311da177e4SLinus Torvalds /** 27321da177e4SLinus Torvalds * device_remove_file - remove sysfs attribute file. 27331da177e4SLinus Torvalds * @dev: device. 27341da177e4SLinus Torvalds * @attr: device attribute descriptor. 27351da177e4SLinus Torvalds */ 273626579ab7SPhil Carmody void device_remove_file(struct device *dev, 273726579ab7SPhil Carmody const struct device_attribute *attr) 27381da177e4SLinus Torvalds { 27390c98b19fSCornelia Huck if (dev) 27401da177e4SLinus Torvalds sysfs_remove_file(&dev->kobj, &attr->attr); 27411da177e4SLinus Torvalds } 274286df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_remove_file); 27431da177e4SLinus Torvalds 27442589f188SGreg Kroah-Hartman /** 27456b0afc2aSTejun Heo * device_remove_file_self - remove sysfs attribute file from its own method. 27466b0afc2aSTejun Heo * @dev: device. 27476b0afc2aSTejun Heo * @attr: device attribute descriptor. 27486b0afc2aSTejun Heo * 27496b0afc2aSTejun Heo * See kernfs_remove_self() for details. 27506b0afc2aSTejun Heo */ 27516b0afc2aSTejun Heo bool device_remove_file_self(struct device *dev, 27526b0afc2aSTejun Heo const struct device_attribute *attr) 27536b0afc2aSTejun Heo { 27546b0afc2aSTejun Heo if (dev) 27556b0afc2aSTejun Heo return sysfs_remove_file_self(&dev->kobj, &attr->attr); 27566b0afc2aSTejun Heo else 27576b0afc2aSTejun Heo return false; 27586b0afc2aSTejun Heo } 27596b0afc2aSTejun Heo EXPORT_SYMBOL_GPL(device_remove_file_self); 27606b0afc2aSTejun Heo 27616b0afc2aSTejun Heo /** 27622589f188SGreg Kroah-Hartman * device_create_bin_file - create sysfs binary attribute file for device. 27632589f188SGreg Kroah-Hartman * @dev: device. 27642589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 27652589f188SGreg Kroah-Hartman */ 276666ecb92bSPhil Carmody int device_create_bin_file(struct device *dev, 276766ecb92bSPhil Carmody const struct bin_attribute *attr) 27682589f188SGreg Kroah-Hartman { 27692589f188SGreg Kroah-Hartman int error = -EINVAL; 27702589f188SGreg Kroah-Hartman if (dev) 27712589f188SGreg Kroah-Hartman error = sysfs_create_bin_file(&dev->kobj, attr); 27722589f188SGreg Kroah-Hartman return error; 27732589f188SGreg Kroah-Hartman } 27742589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_bin_file); 27752589f188SGreg Kroah-Hartman 27762589f188SGreg Kroah-Hartman /** 27772589f188SGreg Kroah-Hartman * device_remove_bin_file - remove sysfs binary attribute file 27782589f188SGreg Kroah-Hartman * @dev: device. 27792589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 27802589f188SGreg Kroah-Hartman */ 278166ecb92bSPhil Carmody void device_remove_bin_file(struct device *dev, 278266ecb92bSPhil Carmody const struct bin_attribute *attr) 27832589f188SGreg Kroah-Hartman { 27842589f188SGreg Kroah-Hartman if (dev) 27852589f188SGreg Kroah-Hartman sysfs_remove_bin_file(&dev->kobj, attr); 27862589f188SGreg Kroah-Hartman } 27872589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_remove_bin_file); 27882589f188SGreg Kroah-Hartman 278934bb61f9SJames Bottomley static void klist_children_get(struct klist_node *n) 279034bb61f9SJames Bottomley { 2791f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 2792f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 279334bb61f9SJames Bottomley 279434bb61f9SJames Bottomley get_device(dev); 279534bb61f9SJames Bottomley } 279634bb61f9SJames Bottomley 279734bb61f9SJames Bottomley static void klist_children_put(struct klist_node *n) 279834bb61f9SJames Bottomley { 2799f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 2800f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 280134bb61f9SJames Bottomley 280234bb61f9SJames Bottomley put_device(dev); 280334bb61f9SJames Bottomley } 280434bb61f9SJames Bottomley 28051da177e4SLinus Torvalds /** 28061da177e4SLinus Torvalds * device_initialize - init device structure. 28071da177e4SLinus Torvalds * @dev: device. 28081da177e4SLinus Torvalds * 28095739411aSCornelia Huck * This prepares the device for use by other layers by initializing 28105739411aSCornelia Huck * its fields. 28111da177e4SLinus Torvalds * It is the first half of device_register(), if called by 28125739411aSCornelia Huck * that function, though it can also be called separately, so one 28135739411aSCornelia Huck * may use @dev's fields. In particular, get_device()/put_device() 28145739411aSCornelia Huck * may be used for reference counting of @dev after calling this 28155739411aSCornelia Huck * function. 28165739411aSCornelia Huck * 2817b10d5efdSAlan Stern * All fields in @dev must be initialized by the caller to 0, except 2818b10d5efdSAlan Stern * for those explicitly set to some other value. The simplest 2819b10d5efdSAlan Stern * approach is to use kzalloc() to allocate the structure containing 2820b10d5efdSAlan Stern * @dev. 2821b10d5efdSAlan Stern * 28225739411aSCornelia Huck * NOTE: Use put_device() to give up your reference instead of freeing 28235739411aSCornelia Huck * @dev directly once you have called this function. 28241da177e4SLinus Torvalds */ 28251da177e4SLinus Torvalds void device_initialize(struct device *dev) 28261da177e4SLinus Torvalds { 2827881c6cfdSGreg Kroah-Hartman dev->kobj.kset = devices_kset; 2828f9cb074bSGreg Kroah-Hartman kobject_init(&dev->kobj, &device_ktype); 28291da177e4SLinus Torvalds INIT_LIST_HEAD(&dev->dma_pools); 28303142788bSThomas Gleixner mutex_init(&dev->mutex); 283187a30e1fSDan Williams #ifdef CONFIG_PROVE_LOCKING 283287a30e1fSDan Williams mutex_init(&dev->lockdep_mutex); 283387a30e1fSDan Williams #endif 28341704f47bSPeter Zijlstra lockdep_set_novalidate_class(&dev->mutex); 28359ac7849eSTejun Heo spin_lock_init(&dev->devres_lock); 28369ac7849eSTejun Heo INIT_LIST_HEAD(&dev->devres_head); 28373b98aeafSAlan Stern device_pm_init(dev); 283887348136SChristoph Hellwig set_dev_node(dev, -1); 28394a7cc831SJiang Liu #ifdef CONFIG_GENERIC_MSI_IRQ 28404a7cc831SJiang Liu INIT_LIST_HEAD(&dev->msi_list); 28414a7cc831SJiang Liu #endif 28429ed98953SRafael J. Wysocki INIT_LIST_HEAD(&dev->links.consumers); 28439ed98953SRafael J. Wysocki INIT_LIST_HEAD(&dev->links.suppliers); 28443b052a3eSSaravana Kannan INIT_LIST_HEAD(&dev->links.defer_sync); 28459ed98953SRafael J. Wysocki dev->links.status = DL_DEV_NO_DRIVER; 28466d4e9a8eSChristoph Hellwig #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ 28476d4e9a8eSChristoph Hellwig defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ 28486d4e9a8eSChristoph Hellwig defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) 28496d4e9a8eSChristoph Hellwig dev->dma_coherent = dma_default_coherent; 28506d4e9a8eSChristoph Hellwig #endif 28511da177e4SLinus Torvalds } 285286df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_initialize); 28531da177e4SLinus Torvalds 2854d73ce004STejun Heo struct kobject *virtual_device_parent(struct device *dev) 2855f0ee61a6SGreg Kroah-Hartman { 2856f0ee61a6SGreg Kroah-Hartman static struct kobject *virtual_dir = NULL; 2857f0ee61a6SGreg Kroah-Hartman 2858f0ee61a6SGreg Kroah-Hartman if (!virtual_dir) 28594ff6abffSGreg Kroah-Hartman virtual_dir = kobject_create_and_add("virtual", 2860881c6cfdSGreg Kroah-Hartman &devices_kset->kobj); 2861f0ee61a6SGreg Kroah-Hartman 286286406245SKay Sievers return virtual_dir; 2863f0ee61a6SGreg Kroah-Hartman } 2864f0ee61a6SGreg Kroah-Hartman 2865bc451f20SEric W. Biederman struct class_dir { 2866bc451f20SEric W. Biederman struct kobject kobj; 2867bc451f20SEric W. Biederman struct class *class; 2868bc451f20SEric W. Biederman }; 2869bc451f20SEric W. Biederman 2870bc451f20SEric W. Biederman #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) 2871bc451f20SEric W. Biederman 2872bc451f20SEric W. Biederman static void class_dir_release(struct kobject *kobj) 2873bc451f20SEric W. Biederman { 2874bc451f20SEric W. Biederman struct class_dir *dir = to_class_dir(kobj); 2875bc451f20SEric W. Biederman kfree(dir); 2876bc451f20SEric W. Biederman } 2877bc451f20SEric W. Biederman 2878bc451f20SEric W. Biederman static const 2879bc451f20SEric W. Biederman struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) 2880bc451f20SEric W. Biederman { 2881bc451f20SEric W. Biederman struct class_dir *dir = to_class_dir(kobj); 2882bc451f20SEric W. Biederman return dir->class->ns_type; 2883bc451f20SEric W. Biederman } 2884bc451f20SEric W. Biederman 2885bc451f20SEric W. Biederman static struct kobj_type class_dir_ktype = { 2886bc451f20SEric W. Biederman .release = class_dir_release, 2887bc451f20SEric W. Biederman .sysfs_ops = &kobj_sysfs_ops, 2888bc451f20SEric W. Biederman .child_ns_type = class_dir_child_ns_type 2889bc451f20SEric W. Biederman }; 2890bc451f20SEric W. Biederman 2891bc451f20SEric W. Biederman static struct kobject * 2892bc451f20SEric W. Biederman class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) 2893bc451f20SEric W. Biederman { 2894bc451f20SEric W. Biederman struct class_dir *dir; 2895bc451f20SEric W. Biederman int retval; 2896bc451f20SEric W. Biederman 2897bc451f20SEric W. Biederman dir = kzalloc(sizeof(*dir), GFP_KERNEL); 2898bc451f20SEric W. Biederman if (!dir) 289984d0c27dSTetsuo Handa return ERR_PTR(-ENOMEM); 2900bc451f20SEric W. Biederman 2901bc451f20SEric W. Biederman dir->class = class; 2902bc451f20SEric W. Biederman kobject_init(&dir->kobj, &class_dir_ktype); 2903bc451f20SEric W. Biederman 29046b6e39a6SKay Sievers dir->kobj.kset = &class->p->glue_dirs; 2905bc451f20SEric W. Biederman 2906bc451f20SEric W. Biederman retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); 2907bc451f20SEric W. Biederman if (retval < 0) { 2908bc451f20SEric W. Biederman kobject_put(&dir->kobj); 290984d0c27dSTetsuo Handa return ERR_PTR(retval); 2910bc451f20SEric W. Biederman } 2911bc451f20SEric W. Biederman return &dir->kobj; 2912bc451f20SEric W. Biederman } 2913bc451f20SEric W. Biederman 2914e4a60d13SYijing Wang static DEFINE_MUTEX(gdp_mutex); 2915bc451f20SEric W. Biederman 2916c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 2917c744aeaeSCornelia Huck struct device *parent) 291840fa5422SGreg Kroah-Hartman { 291986406245SKay Sievers if (dev->class) { 292086406245SKay Sievers struct kobject *kobj = NULL; 292186406245SKay Sievers struct kobject *parent_kobj; 292286406245SKay Sievers struct kobject *k; 292386406245SKay Sievers 2924ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 292539aba963SKay Sievers /* block disks show up in /sys/block */ 2926e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) { 292739aba963SKay Sievers if (parent && parent->class == &block_class) 292839aba963SKay Sievers return &parent->kobj; 29296b6e39a6SKay Sievers return &block_class.p->subsys.kobj; 293039aba963SKay Sievers } 2931ead454feSRandy Dunlap #endif 2932e52eec13SAndi Kleen 293386406245SKay Sievers /* 293486406245SKay Sievers * If we have no parent, we live in "virtual". 29350f4dafc0SKay Sievers * Class-devices with a non class-device as parent, live 29360f4dafc0SKay Sievers * in a "glue" directory to prevent namespace collisions. 293786406245SKay Sievers */ 293886406245SKay Sievers if (parent == NULL) 293986406245SKay Sievers parent_kobj = virtual_device_parent(dev); 294024b1442dSEric W. Biederman else if (parent->class && !dev->class->ns_type) 294186406245SKay Sievers return &parent->kobj; 294286406245SKay Sievers else 294386406245SKay Sievers parent_kobj = &parent->kobj; 294486406245SKay Sievers 294577d3d7c1STejun Heo mutex_lock(&gdp_mutex); 294677d3d7c1STejun Heo 294786406245SKay Sievers /* find our class-directory at the parent and reference it */ 29486b6e39a6SKay Sievers spin_lock(&dev->class->p->glue_dirs.list_lock); 29496b6e39a6SKay Sievers list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) 295086406245SKay Sievers if (k->parent == parent_kobj) { 295186406245SKay Sievers kobj = kobject_get(k); 295286406245SKay Sievers break; 295386406245SKay Sievers } 29546b6e39a6SKay Sievers spin_unlock(&dev->class->p->glue_dirs.list_lock); 295577d3d7c1STejun Heo if (kobj) { 295677d3d7c1STejun Heo mutex_unlock(&gdp_mutex); 295786406245SKay Sievers return kobj; 295877d3d7c1STejun Heo } 295986406245SKay Sievers 296086406245SKay Sievers /* or create a new class-directory at the parent device */ 2961bc451f20SEric W. Biederman k = class_dir_create_and_add(dev->class, parent_kobj); 29620f4dafc0SKay Sievers /* do not emit an uevent for this simple "glue" directory */ 296377d3d7c1STejun Heo mutex_unlock(&gdp_mutex); 296443968d2fSGreg Kroah-Hartman return k; 296586406245SKay Sievers } 296686406245SKay Sievers 2967ca22e56dSKay Sievers /* subsystems can specify a default root directory for their devices */ 2968ca22e56dSKay Sievers if (!parent && dev->bus && dev->bus->dev_root) 2969ca22e56dSKay Sievers return &dev->bus->dev_root->kobj; 2970ca22e56dSKay Sievers 297186406245SKay Sievers if (parent) 2972c744aeaeSCornelia Huck return &parent->kobj; 2973c744aeaeSCornelia Huck return NULL; 2974c744aeaeSCornelia Huck } 2975da231fd5SKay Sievers 2976cebf8fd1SMing Lei static inline bool live_in_glue_dir(struct kobject *kobj, 2977cebf8fd1SMing Lei struct device *dev) 2978cebf8fd1SMing Lei { 2979cebf8fd1SMing Lei if (!kobj || !dev->class || 2980cebf8fd1SMing Lei kobj->kset != &dev->class->p->glue_dirs) 2981cebf8fd1SMing Lei return false; 2982cebf8fd1SMing Lei return true; 2983cebf8fd1SMing Lei } 2984cebf8fd1SMing Lei 2985cebf8fd1SMing Lei static inline struct kobject *get_glue_dir(struct device *dev) 2986cebf8fd1SMing Lei { 2987cebf8fd1SMing Lei return dev->kobj.parent; 2988cebf8fd1SMing Lei } 2989cebf8fd1SMing Lei 2990cebf8fd1SMing Lei /* 2991cebf8fd1SMing Lei * make sure cleaning up dir as the last step, we need to make 2992cebf8fd1SMing Lei * sure .release handler of kobject is run with holding the 2993cebf8fd1SMing Lei * global lock 2994cebf8fd1SMing Lei */ 299563b6971aSCornelia Huck static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) 2996da231fd5SKay Sievers { 2997ac43432cSMuchun Song unsigned int ref; 2998ac43432cSMuchun Song 29990f4dafc0SKay Sievers /* see if we live in a "glue" directory */ 3000cebf8fd1SMing Lei if (!live_in_glue_dir(glue_dir, dev)) 3001da231fd5SKay Sievers return; 3002da231fd5SKay Sievers 3003e4a60d13SYijing Wang mutex_lock(&gdp_mutex); 3004ac43432cSMuchun Song /** 3005ac43432cSMuchun Song * There is a race condition between removing glue directory 3006ac43432cSMuchun Song * and adding a new device under the glue directory. 3007ac43432cSMuchun Song * 3008ac43432cSMuchun Song * CPU1: CPU2: 3009ac43432cSMuchun Song * 3010ac43432cSMuchun Song * device_add() 3011ac43432cSMuchun Song * get_device_parent() 3012ac43432cSMuchun Song * class_dir_create_and_add() 3013ac43432cSMuchun Song * kobject_add_internal() 3014ac43432cSMuchun Song * create_dir() // create glue_dir 3015ac43432cSMuchun Song * 3016ac43432cSMuchun Song * device_add() 3017ac43432cSMuchun Song * get_device_parent() 3018ac43432cSMuchun Song * kobject_get() // get glue_dir 3019ac43432cSMuchun Song * 3020ac43432cSMuchun Song * device_del() 3021ac43432cSMuchun Song * cleanup_glue_dir() 3022ac43432cSMuchun Song * kobject_del(glue_dir) 3023ac43432cSMuchun Song * 3024ac43432cSMuchun Song * kobject_add() 3025ac43432cSMuchun Song * kobject_add_internal() 3026ac43432cSMuchun Song * create_dir() // in glue_dir 3027ac43432cSMuchun Song * sysfs_create_dir_ns() 3028ac43432cSMuchun Song * kernfs_create_dir_ns(sd) 3029ac43432cSMuchun Song * 3030ac43432cSMuchun Song * sysfs_remove_dir() // glue_dir->sd=NULL 3031ac43432cSMuchun Song * sysfs_put() // free glue_dir->sd 3032ac43432cSMuchun Song * 3033ac43432cSMuchun Song * // sd is freed 3034ac43432cSMuchun Song * kernfs_new_node(sd) 3035ac43432cSMuchun Song * kernfs_get(glue_dir) 3036ac43432cSMuchun Song * kernfs_add_one() 3037ac43432cSMuchun Song * kernfs_put() 3038ac43432cSMuchun Song * 3039ac43432cSMuchun Song * Before CPU1 remove last child device under glue dir, if CPU2 add 3040ac43432cSMuchun Song * a new device under glue dir, the glue_dir kobject reference count 3041ac43432cSMuchun Song * will be increase to 2 in kobject_get(k). And CPU2 has been called 3042ac43432cSMuchun Song * kernfs_create_dir_ns(). Meanwhile, CPU1 call sysfs_remove_dir() 3043ac43432cSMuchun Song * and sysfs_put(). This result in glue_dir->sd is freed. 3044ac43432cSMuchun Song * 3045ac43432cSMuchun Song * Then the CPU2 will see a stale "empty" but still potentially used 3046ac43432cSMuchun Song * glue dir around in kernfs_new_node(). 3047ac43432cSMuchun Song * 3048ac43432cSMuchun Song * In order to avoid this happening, we also should make sure that 3049ac43432cSMuchun Song * kernfs_node for glue_dir is released in CPU1 only when refcount 3050ac43432cSMuchun Song * for glue_dir kobj is 1. 3051ac43432cSMuchun Song */ 3052ac43432cSMuchun Song ref = kref_read(&glue_dir->kref); 3053ac43432cSMuchun Song if (!kobject_has_children(glue_dir) && !--ref) 3054726e4109SBenjamin Herrenschmidt kobject_del(glue_dir); 30550f4dafc0SKay Sievers kobject_put(glue_dir); 3056e4a60d13SYijing Wang mutex_unlock(&gdp_mutex); 3057da231fd5SKay Sievers } 305863b6971aSCornelia Huck 30592ee97cafSCornelia Huck static int device_add_class_symlinks(struct device *dev) 30602ee97cafSCornelia Huck { 30615590f319SBenjamin Herrenschmidt struct device_node *of_node = dev_of_node(dev); 30622ee97cafSCornelia Huck int error; 30632ee97cafSCornelia Huck 30645590f319SBenjamin Herrenschmidt if (of_node) { 30650c3c234bSRob Herring error = sysfs_create_link(&dev->kobj, of_node_kobj(of_node), "of_node"); 30665590f319SBenjamin Herrenschmidt if (error) 30675590f319SBenjamin Herrenschmidt dev_warn(dev, "Error %d creating of_node link\n",error); 30685590f319SBenjamin Herrenschmidt /* An error here doesn't warrant bringing down the device */ 30695590f319SBenjamin Herrenschmidt } 30705590f319SBenjamin Herrenschmidt 30712ee97cafSCornelia Huck if (!dev->class) 30722ee97cafSCornelia Huck return 0; 3073da231fd5SKay Sievers 30741fbfee6cSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, 30756b6e39a6SKay Sievers &dev->class->p->subsys.kobj, 30762ee97cafSCornelia Huck "subsystem"); 30772ee97cafSCornelia Huck if (error) 30785590f319SBenjamin Herrenschmidt goto out_devnode; 3079da231fd5SKay Sievers 30804e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) { 30814f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, 30824f01a757SDmitry Torokhov "device"); 30834f01a757SDmitry Torokhov if (error) 308439aba963SKay Sievers goto out_subsys; 30852ee97cafSCornelia Huck } 308639aba963SKay Sievers 3087ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 308839aba963SKay Sievers /* /sys/block has directories and does not need symlinks */ 3089e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) 309039aba963SKay Sievers return 0; 3091ead454feSRandy Dunlap #endif 309239aba963SKay Sievers 309339aba963SKay Sievers /* link in the class directory pointing to the device */ 30946b6e39a6SKay Sievers error = sysfs_create_link(&dev->class->p->subsys.kobj, 309539aba963SKay Sievers &dev->kobj, dev_name(dev)); 309639aba963SKay Sievers if (error) 309739aba963SKay Sievers goto out_device; 309839aba963SKay Sievers 30992ee97cafSCornelia Huck return 0; 31002ee97cafSCornelia Huck 310139aba963SKay Sievers out_device: 310239aba963SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 3103da231fd5SKay Sievers 31042ee97cafSCornelia Huck out_subsys: 31052ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 31065590f319SBenjamin Herrenschmidt out_devnode: 31075590f319SBenjamin Herrenschmidt sysfs_remove_link(&dev->kobj, "of_node"); 31082ee97cafSCornelia Huck return error; 31092ee97cafSCornelia Huck } 31102ee97cafSCornelia Huck 31112ee97cafSCornelia Huck static void device_remove_class_symlinks(struct device *dev) 31122ee97cafSCornelia Huck { 31135590f319SBenjamin Herrenschmidt if (dev_of_node(dev)) 31145590f319SBenjamin Herrenschmidt sysfs_remove_link(&dev->kobj, "of_node"); 31155590f319SBenjamin Herrenschmidt 31162ee97cafSCornelia Huck if (!dev->class) 31172ee97cafSCornelia Huck return; 3118da231fd5SKay Sievers 31194e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) 3120da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 31212ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 3122ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 3123e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) 312439aba963SKay Sievers return; 3125ead454feSRandy Dunlap #endif 31266b6e39a6SKay Sievers sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); 31272ee97cafSCornelia Huck } 31282ee97cafSCornelia Huck 31291da177e4SLinus Torvalds /** 3130413c239fSStephen Rothwell * dev_set_name - set a device name 3131413c239fSStephen Rothwell * @dev: device 313246232366SRandy Dunlap * @fmt: format string for the device's name 3133413c239fSStephen Rothwell */ 3134413c239fSStephen Rothwell int dev_set_name(struct device *dev, const char *fmt, ...) 3135413c239fSStephen Rothwell { 3136413c239fSStephen Rothwell va_list vargs; 31371fa5ae85SKay Sievers int err; 3138413c239fSStephen Rothwell 3139413c239fSStephen Rothwell va_start(vargs, fmt); 31401fa5ae85SKay Sievers err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); 3141413c239fSStephen Rothwell va_end(vargs); 31421fa5ae85SKay Sievers return err; 3143413c239fSStephen Rothwell } 3144413c239fSStephen Rothwell EXPORT_SYMBOL_GPL(dev_set_name); 3145413c239fSStephen Rothwell 3146413c239fSStephen Rothwell /** 3147e105b8bfSDan Williams * device_to_dev_kobj - select a /sys/dev/ directory for the device 3148e105b8bfSDan Williams * @dev: device 3149e105b8bfSDan Williams * 3150e105b8bfSDan Williams * By default we select char/ for new entries. Setting class->dev_obj 3151e105b8bfSDan Williams * to NULL prevents an entry from being created. class->dev_kobj must 3152e105b8bfSDan Williams * be set (or cleared) before any devices are registered to the class 3153e105b8bfSDan Williams * otherwise device_create_sys_dev_entry() and 31540d4e293cSPeter Korsgaard * device_remove_sys_dev_entry() will disagree about the presence of 31550d4e293cSPeter Korsgaard * the link. 3156e105b8bfSDan Williams */ 3157e105b8bfSDan Williams static struct kobject *device_to_dev_kobj(struct device *dev) 3158e105b8bfSDan Williams { 3159e105b8bfSDan Williams struct kobject *kobj; 3160e105b8bfSDan Williams 3161e105b8bfSDan Williams if (dev->class) 3162e105b8bfSDan Williams kobj = dev->class->dev_kobj; 3163e105b8bfSDan Williams else 3164e105b8bfSDan Williams kobj = sysfs_dev_char_kobj; 3165e105b8bfSDan Williams 3166e105b8bfSDan Williams return kobj; 3167e105b8bfSDan Williams } 3168e105b8bfSDan Williams 3169e105b8bfSDan Williams static int device_create_sys_dev_entry(struct device *dev) 3170e105b8bfSDan Williams { 3171e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 3172e105b8bfSDan Williams int error = 0; 3173e105b8bfSDan Williams char devt_str[15]; 3174e105b8bfSDan Williams 3175e105b8bfSDan Williams if (kobj) { 3176e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 3177e105b8bfSDan Williams error = sysfs_create_link(kobj, &dev->kobj, devt_str); 3178e105b8bfSDan Williams } 3179e105b8bfSDan Williams 3180e105b8bfSDan Williams return error; 3181e105b8bfSDan Williams } 3182e105b8bfSDan Williams 3183e105b8bfSDan Williams static void device_remove_sys_dev_entry(struct device *dev) 3184e105b8bfSDan Williams { 3185e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 3186e105b8bfSDan Williams char devt_str[15]; 3187e105b8bfSDan Williams 3188e105b8bfSDan Williams if (kobj) { 3189e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 3190e105b8bfSDan Williams sysfs_remove_link(kobj, devt_str); 3191e105b8bfSDan Williams } 3192e105b8bfSDan Williams } 3193e105b8bfSDan Williams 319446d3a037SShaokun Zhang static int device_private_init(struct device *dev) 3195b4028437SGreg Kroah-Hartman { 3196b4028437SGreg Kroah-Hartman dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); 3197b4028437SGreg Kroah-Hartman if (!dev->p) 3198b4028437SGreg Kroah-Hartman return -ENOMEM; 3199b4028437SGreg Kroah-Hartman dev->p->device = dev; 3200b4028437SGreg Kroah-Hartman klist_init(&dev->p->klist_children, klist_children_get, 3201b4028437SGreg Kroah-Hartman klist_children_put); 3202ef8a3fd6SGreg Kroah-Hartman INIT_LIST_HEAD(&dev->p->deferred_probe); 3203b4028437SGreg Kroah-Hartman return 0; 3204b4028437SGreg Kroah-Hartman } 3205b4028437SGreg Kroah-Hartman 3206e105b8bfSDan Williams /** 32071da177e4SLinus Torvalds * device_add - add device to device hierarchy. 32081da177e4SLinus Torvalds * @dev: device. 32091da177e4SLinus Torvalds * 32101da177e4SLinus Torvalds * This is part 2 of device_register(), though may be called 32111da177e4SLinus Torvalds * separately _iff_ device_initialize() has been called separately. 32121da177e4SLinus Torvalds * 32135739411aSCornelia Huck * This adds @dev to the kobject hierarchy via kobject_add(), adds it 32141da177e4SLinus Torvalds * to the global and sibling lists for the device, then 32151da177e4SLinus Torvalds * adds it to the other relevant subsystems of the driver model. 32165739411aSCornelia Huck * 3217b10d5efdSAlan Stern * Do not call this routine or device_register() more than once for 3218b10d5efdSAlan Stern * any device structure. The driver model core is not designed to work 3219b10d5efdSAlan Stern * with devices that get unregistered and then spring back to life. 3220b10d5efdSAlan Stern * (Among other things, it's very hard to guarantee that all references 3221b10d5efdSAlan Stern * to the previous incarnation of @dev have been dropped.) Allocate 3222b10d5efdSAlan Stern * and register a fresh new struct device instead. 3223b10d5efdSAlan Stern * 32245739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 32255739411aSCornelia Huck * if it returned an error! Always use put_device() to give up your 32265739411aSCornelia Huck * reference instead. 3227affada72SBorislav Petkov * 3228affada72SBorislav Petkov * Rule of thumb is: if device_add() succeeds, you should call 3229affada72SBorislav Petkov * device_del() when you want to get rid of it. If device_add() has 3230affada72SBorislav Petkov * *not* succeeded, use *only* put_device() to drop the reference 3231affada72SBorislav Petkov * count. 32321da177e4SLinus Torvalds */ 32331da177e4SLinus Torvalds int device_add(struct device *dev) 32341da177e4SLinus Torvalds { 323535dbf4efSViresh Kumar struct device *parent; 3236ca22e56dSKay Sievers struct kobject *kobj; 3237c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 32385f5377eaSSaravana Kannan int error = -EINVAL; 3239cebf8fd1SMing Lei struct kobject *glue_dir = NULL; 3240775b64d2SRafael J. Wysocki 32411da177e4SLinus Torvalds dev = get_device(dev); 3242c906a48aSGreg Kroah-Hartman if (!dev) 3243c906a48aSGreg Kroah-Hartman goto done; 3244c906a48aSGreg Kroah-Hartman 3245fb069a5dSGreg Kroah-Hartman if (!dev->p) { 3246b4028437SGreg Kroah-Hartman error = device_private_init(dev); 3247b4028437SGreg Kroah-Hartman if (error) 3248fb069a5dSGreg Kroah-Hartman goto done; 3249fb069a5dSGreg Kroah-Hartman } 3250fb069a5dSGreg Kroah-Hartman 32511fa5ae85SKay Sievers /* 32521fa5ae85SKay Sievers * for statically allocated devices, which should all be converted 32531fa5ae85SKay Sievers * some day, we need to initialize the name. We prevent reading back 32541fa5ae85SKay Sievers * the name, and force the use of dev_name() 32551fa5ae85SKay Sievers */ 32561fa5ae85SKay Sievers if (dev->init_name) { 3257acc0e90fSGreg Kroah-Hartman dev_set_name(dev, "%s", dev->init_name); 32581fa5ae85SKay Sievers dev->init_name = NULL; 32591fa5ae85SKay Sievers } 3260c906a48aSGreg Kroah-Hartman 3261ca22e56dSKay Sievers /* subsystems can specify simple device enumeration */ 3262ca22e56dSKay Sievers if (!dev_name(dev) && dev->bus && dev->bus->dev_name) 3263ca22e56dSKay Sievers dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); 3264ca22e56dSKay Sievers 3265e6309e75SThomas Gleixner if (!dev_name(dev)) { 3266e6309e75SThomas Gleixner error = -EINVAL; 32675c8563d7SKay Sievers goto name_error; 3268e6309e75SThomas Gleixner } 32691da177e4SLinus Torvalds 32701e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 3271c205ef48SGreg Kroah-Hartman 32721da177e4SLinus Torvalds parent = get_device(dev->parent); 3273ca22e56dSKay Sievers kobj = get_device_parent(dev, parent); 327484d0c27dSTetsuo Handa if (IS_ERR(kobj)) { 327584d0c27dSTetsuo Handa error = PTR_ERR(kobj); 327684d0c27dSTetsuo Handa goto parent_error; 327784d0c27dSTetsuo Handa } 3278ca22e56dSKay Sievers if (kobj) 3279ca22e56dSKay Sievers dev->kobj.parent = kobj; 32801da177e4SLinus Torvalds 32810d358f22SYinghai Lu /* use parent numa_node */ 328256f2de81SZhen Lei if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) 32830d358f22SYinghai Lu set_dev_node(dev, dev_to_node(parent)); 32840d358f22SYinghai Lu 32851da177e4SLinus Torvalds /* first, register with generic layer. */ 32868a577ffcSKay Sievers /* we require the name to be set before, and pass NULL */ 32878a577ffcSKay Sievers error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); 3288cebf8fd1SMing Lei if (error) { 3289cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 32901da177e4SLinus Torvalds goto Error; 3291cebf8fd1SMing Lei } 3292a7fd6706SKay Sievers 329337022644SBrian Walsh /* notify platform of device entry */ 329407de0e86SHeikki Krogerus error = device_platform_notify(dev, KOBJ_ADD); 329507de0e86SHeikki Krogerus if (error) 329607de0e86SHeikki Krogerus goto platform_error; 329737022644SBrian Walsh 3298c5e064a6SGreg Kroah-Hartman error = device_create_file(dev, &dev_attr_uevent); 3299a306eea4SCornelia Huck if (error) 3300a306eea4SCornelia Huck goto attrError; 3301a7fd6706SKay Sievers 33022ee97cafSCornelia Huck error = device_add_class_symlinks(dev); 33032ee97cafSCornelia Huck if (error) 33042ee97cafSCornelia Huck goto SymlinkError; 3305dc0afa83SCornelia Huck error = device_add_attrs(dev); 3306dc0afa83SCornelia Huck if (error) 33072620efefSGreg Kroah-Hartman goto AttrsError; 3308dc0afa83SCornelia Huck error = bus_add_device(dev); 3309dc0afa83SCornelia Huck if (error) 33101da177e4SLinus Torvalds goto BusError; 33113b98aeafSAlan Stern error = dpm_sysfs_add(dev); 331257eee3d2SRafael J. Wysocki if (error) 33133b98aeafSAlan Stern goto DPMError; 33143b98aeafSAlan Stern device_pm_add(dev); 3315ec0676eeSAlan Stern 33160cd75047SSergey Klyaus if (MAJOR(dev->devt)) { 33170cd75047SSergey Klyaus error = device_create_file(dev, &dev_attr_dev); 33180cd75047SSergey Klyaus if (error) 33190cd75047SSergey Klyaus goto DevAttrError; 33200cd75047SSergey Klyaus 33210cd75047SSergey Klyaus error = device_create_sys_dev_entry(dev); 33220cd75047SSergey Klyaus if (error) 33230cd75047SSergey Klyaus goto SysEntryError; 33240cd75047SSergey Klyaus 33250cd75047SSergey Klyaus devtmpfs_create_node(dev); 33260cd75047SSergey Klyaus } 33270cd75047SSergey Klyaus 3328ec0676eeSAlan Stern /* Notify clients of device addition. This call must come 3329268863f4Smajianpeng * after dpm_sysfs_add() and before kobject_uevent(). 3330ec0676eeSAlan Stern */ 3331ec0676eeSAlan Stern if (dev->bus) 3332ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 3333ec0676eeSAlan Stern BUS_NOTIFY_ADD_DEVICE, dev); 3334ec0676eeSAlan Stern 333553877d06SKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 3336372a67c0SSaravana Kannan 3337e2ae9bccSSaravana Kannan /* 3338e2ae9bccSSaravana Kannan * Check if any of the other devices (consumers) have been waiting for 3339e2ae9bccSSaravana Kannan * this device (supplier) to be added so that they can create a device 3340e2ae9bccSSaravana Kannan * link to it. 3341e2ae9bccSSaravana Kannan * 3342e2ae9bccSSaravana Kannan * This needs to happen after device_pm_add() because device_link_add() 3343e2ae9bccSSaravana Kannan * requires the supplier be registered before it's called. 3344e2ae9bccSSaravana Kannan * 33452cd38fd1SSaravana Kannan * But this also needs to happen before bus_probe_device() to make sure 3346e2ae9bccSSaravana Kannan * waiting consumers can link to it before the driver is bound to the 3347e2ae9bccSSaravana Kannan * device and the driver sync_state callback is called for this device. 3348e2ae9bccSSaravana Kannan */ 33492cd38fd1SSaravana Kannan if (dev->fwnode && !dev->fwnode->dev) { 33502cd38fd1SSaravana Kannan dev->fwnode->dev = dev; 33515f5377eaSSaravana Kannan fw_devlink_link_device(dev); 335203324507SSaravana Kannan } 3353e2ae9bccSSaravana Kannan 33542023c610SAlan Stern bus_probe_device(dev); 3355d46f3e3eSSaravana Kannan 3356d46f3e3eSSaravana Kannan /* 3357d46f3e3eSSaravana Kannan * If all driver registration is done and a newly added device doesn't 3358d46f3e3eSSaravana Kannan * match with any driver, don't block its consumers from probing in 3359d46f3e3eSSaravana Kannan * case the consumer device is able to operate without this supplier. 3360d46f3e3eSSaravana Kannan */ 3361d46f3e3eSSaravana Kannan if (dev->fwnode && fw_devlink_drv_reg_done && !dev->can_match) 3362d46f3e3eSSaravana Kannan fw_devlink_unblock_consumers(dev); 3363d46f3e3eSSaravana Kannan 33641da177e4SLinus Torvalds if (parent) 3365f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 3366f791b8c8SGreg Kroah-Hartman &parent->p->klist_children); 33671da177e4SLinus Torvalds 33685d9fd169SGreg Kroah-Hartman if (dev->class) { 3369ca22e56dSKay Sievers mutex_lock(&dev->class->p->mutex); 3370c47ed219SGreg Kroah-Hartman /* tie the class to the device */ 3371570d0200SWei Yang klist_add_tail(&dev->p->knode_class, 33726b6e39a6SKay Sievers &dev->class->p->klist_devices); 3373c47ed219SGreg Kroah-Hartman 3374c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is here */ 3375184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 3376ca22e56dSKay Sievers &dev->class->p->interfaces, node) 3377c47ed219SGreg Kroah-Hartman if (class_intf->add_dev) 3378c47ed219SGreg Kroah-Hartman class_intf->add_dev(dev, class_intf); 3379ca22e56dSKay Sievers mutex_unlock(&dev->class->p->mutex); 33805d9fd169SGreg Kroah-Hartman } 3381c906a48aSGreg Kroah-Hartman done: 33821da177e4SLinus Torvalds put_device(dev); 33831da177e4SLinus Torvalds return error; 33840cd75047SSergey Klyaus SysEntryError: 33850cd75047SSergey Klyaus if (MAJOR(dev->devt)) 33860cd75047SSergey Klyaus device_remove_file(dev, &dev_attr_dev); 33870cd75047SSergey Klyaus DevAttrError: 33880cd75047SSergey Klyaus device_pm_remove(dev); 33890cd75047SSergey Klyaus dpm_sysfs_remove(dev); 33903b98aeafSAlan Stern DPMError: 339157eee3d2SRafael J. Wysocki bus_remove_device(dev); 339257eee3d2SRafael J. Wysocki BusError: 33932620efefSGreg Kroah-Hartman device_remove_attrs(dev); 33942620efefSGreg Kroah-Hartman AttrsError: 33952ee97cafSCornelia Huck device_remove_class_symlinks(dev); 33962ee97cafSCornelia Huck SymlinkError: 3397c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_uevent); 339823681e47SGreg Kroah-Hartman attrError: 339907de0e86SHeikki Krogerus device_platform_notify(dev, KOBJ_REMOVE); 340007de0e86SHeikki Krogerus platform_error: 3401312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 3402cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 34031da177e4SLinus Torvalds kobject_del(&dev->kobj); 34041da177e4SLinus Torvalds Error: 3405cebf8fd1SMing Lei cleanup_glue_dir(dev, glue_dir); 340684d0c27dSTetsuo Handa parent_error: 34071da177e4SLinus Torvalds put_device(parent); 34085c8563d7SKay Sievers name_error: 34095c8563d7SKay Sievers kfree(dev->p); 34105c8563d7SKay Sievers dev->p = NULL; 3411c906a48aSGreg Kroah-Hartman goto done; 34121da177e4SLinus Torvalds } 341386df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_add); 34141da177e4SLinus Torvalds 34151da177e4SLinus Torvalds /** 34161da177e4SLinus Torvalds * device_register - register a device with the system. 34171da177e4SLinus Torvalds * @dev: pointer to the device structure 34181da177e4SLinus Torvalds * 34191da177e4SLinus Torvalds * This happens in two clean steps - initialize the device 34201da177e4SLinus Torvalds * and add it to the system. The two steps can be called 34211da177e4SLinus Torvalds * separately, but this is the easiest and most common. 34221da177e4SLinus Torvalds * I.e. you should only call the two helpers separately if 34231da177e4SLinus Torvalds * have a clearly defined need to use and refcount the device 34241da177e4SLinus Torvalds * before it is added to the hierarchy. 34255739411aSCornelia Huck * 3426b10d5efdSAlan Stern * For more information, see the kerneldoc for device_initialize() 3427b10d5efdSAlan Stern * and device_add(). 3428b10d5efdSAlan Stern * 34295739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 34305739411aSCornelia Huck * if it returned an error! Always use put_device() to give up the 34315739411aSCornelia Huck * reference initialized in this function instead. 34321da177e4SLinus Torvalds */ 34331da177e4SLinus Torvalds int device_register(struct device *dev) 34341da177e4SLinus Torvalds { 34351da177e4SLinus Torvalds device_initialize(dev); 34361da177e4SLinus Torvalds return device_add(dev); 34371da177e4SLinus Torvalds } 343886df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_register); 34391da177e4SLinus Torvalds 34401da177e4SLinus Torvalds /** 34411da177e4SLinus Torvalds * get_device - increment reference count for device. 34421da177e4SLinus Torvalds * @dev: device. 34431da177e4SLinus Torvalds * 34441da177e4SLinus Torvalds * This simply forwards the call to kobject_get(), though 34451da177e4SLinus Torvalds * we do take care to provide for the case that we get a NULL 34461da177e4SLinus Torvalds * pointer passed in. 34471da177e4SLinus Torvalds */ 34481da177e4SLinus Torvalds struct device *get_device(struct device *dev) 34491da177e4SLinus Torvalds { 3450b0d1f807SLars-Peter Clausen return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; 34511da177e4SLinus Torvalds } 345286df2687SDavid Graham White EXPORT_SYMBOL_GPL(get_device); 34531da177e4SLinus Torvalds 34541da177e4SLinus Torvalds /** 34551da177e4SLinus Torvalds * put_device - decrement reference count. 34561da177e4SLinus Torvalds * @dev: device in question. 34571da177e4SLinus Torvalds */ 34581da177e4SLinus Torvalds void put_device(struct device *dev) 34591da177e4SLinus Torvalds { 3460edfaa7c3SKay Sievers /* might_sleep(); */ 34611da177e4SLinus Torvalds if (dev) 34621da177e4SLinus Torvalds kobject_put(&dev->kobj); 34631da177e4SLinus Torvalds } 346486df2687SDavid Graham White EXPORT_SYMBOL_GPL(put_device); 34651da177e4SLinus Torvalds 346600289cd8SDan Williams bool kill_device(struct device *dev) 346700289cd8SDan Williams { 346800289cd8SDan Williams /* 346900289cd8SDan Williams * Require the device lock and set the "dead" flag to guarantee that 347000289cd8SDan Williams * the update behavior is consistent with the other bitfields near 347100289cd8SDan Williams * it and that we cannot have an asynchronous probe routine trying 347200289cd8SDan Williams * to run while we are tearing out the bus/class/sysfs from 347300289cd8SDan Williams * underneath the device. 347400289cd8SDan Williams */ 34758c60a141SJulian Wiedmann device_lock_assert(dev); 347600289cd8SDan Williams 347700289cd8SDan Williams if (dev->p->dead) 347800289cd8SDan Williams return false; 347900289cd8SDan Williams dev->p->dead = true; 348000289cd8SDan Williams return true; 348100289cd8SDan Williams } 348200289cd8SDan Williams EXPORT_SYMBOL_GPL(kill_device); 348300289cd8SDan Williams 34841da177e4SLinus Torvalds /** 34851da177e4SLinus Torvalds * device_del - delete device from system. 34861da177e4SLinus Torvalds * @dev: device. 34871da177e4SLinus Torvalds * 34881da177e4SLinus Torvalds * This is the first part of the device unregistration 34891da177e4SLinus Torvalds * sequence. This removes the device from the lists we control 34901da177e4SLinus Torvalds * from here, has it removed from the other driver model 34911da177e4SLinus Torvalds * subsystems it was added to in device_add(), and removes it 34921da177e4SLinus Torvalds * from the kobject hierarchy. 34931da177e4SLinus Torvalds * 34941da177e4SLinus Torvalds * NOTE: this should be called manually _iff_ device_add() was 34951da177e4SLinus Torvalds * also called manually. 34961da177e4SLinus Torvalds */ 34971da177e4SLinus Torvalds void device_del(struct device *dev) 34981da177e4SLinus Torvalds { 34991da177e4SLinus Torvalds struct device *parent = dev->parent; 3500cebf8fd1SMing Lei struct kobject *glue_dir = NULL; 3501c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 3502b8530017SOliver Neukum unsigned int noio_flag; 35031da177e4SLinus Torvalds 35043451a495SAlexander Duyck device_lock(dev); 350500289cd8SDan Williams kill_device(dev); 35063451a495SAlexander Duyck device_unlock(dev); 35073451a495SAlexander Duyck 3508372a67c0SSaravana Kannan if (dev->fwnode && dev->fwnode->dev == dev) 3509372a67c0SSaravana Kannan dev->fwnode->dev = NULL; 3510372a67c0SSaravana Kannan 3511ec0676eeSAlan Stern /* Notify clients of device removal. This call must come 3512ec0676eeSAlan Stern * before dpm_sysfs_remove(). 3513ec0676eeSAlan Stern */ 3514b8530017SOliver Neukum noio_flag = memalloc_noio_save(); 3515ec0676eeSAlan Stern if (dev->bus) 3516ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 3517ec0676eeSAlan Stern BUS_NOTIFY_DEL_DEVICE, dev); 35189ed98953SRafael J. Wysocki 35193b98aeafSAlan Stern dpm_sysfs_remove(dev); 35201da177e4SLinus Torvalds if (parent) 3521f791b8c8SGreg Kroah-Hartman klist_del(&dev->p->knode_parent); 3522e105b8bfSDan Williams if (MAJOR(dev->devt)) { 35232b2af54aSKay Sievers devtmpfs_delete_node(dev); 3524e105b8bfSDan Williams device_remove_sys_dev_entry(dev); 3525c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_dev); 3526e105b8bfSDan Williams } 3527b9d9c82bSKay Sievers if (dev->class) { 3528da231fd5SKay Sievers device_remove_class_symlinks(dev); 352999ef3ef8SKay Sievers 3530ca22e56dSKay Sievers mutex_lock(&dev->class->p->mutex); 3531c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is now gone */ 3532184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 3533ca22e56dSKay Sievers &dev->class->p->interfaces, node) 3534c47ed219SGreg Kroah-Hartman if (class_intf->remove_dev) 3535c47ed219SGreg Kroah-Hartman class_intf->remove_dev(dev, class_intf); 3536c47ed219SGreg Kroah-Hartman /* remove the device from the class list */ 3537570d0200SWei Yang klist_del(&dev->p->knode_class); 3538ca22e56dSKay Sievers mutex_unlock(&dev->class->p->mutex); 3539b9d9c82bSKay Sievers } 3540c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_uevent); 35412620efefSGreg Kroah-Hartman device_remove_attrs(dev); 354228953533SBenjamin Herrenschmidt bus_remove_device(dev); 35434b6d1f12SLongX Zhang device_pm_remove(dev); 3544d1c3414cSGrant Likely driver_deferred_probe_del(dev); 354507de0e86SHeikki Krogerus device_platform_notify(dev, KOBJ_REMOVE); 3546478573c9SLukas Wunner device_remove_properties(dev); 35472ec16150SJeffy Chen device_links_purge(dev); 35481da177e4SLinus Torvalds 3549599bad38SJoerg Roedel if (dev->bus) 3550599bad38SJoerg Roedel blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 3551599bad38SJoerg Roedel BUS_NOTIFY_REMOVED_DEVICE, dev); 3552312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 3553cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 35541da177e4SLinus Torvalds kobject_del(&dev->kobj); 3555cebf8fd1SMing Lei cleanup_glue_dir(dev, glue_dir); 3556b8530017SOliver Neukum memalloc_noio_restore(noio_flag); 35571da177e4SLinus Torvalds put_device(parent); 35581da177e4SLinus Torvalds } 355986df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_del); 35601da177e4SLinus Torvalds 35611da177e4SLinus Torvalds /** 35621da177e4SLinus Torvalds * device_unregister - unregister device from system. 35631da177e4SLinus Torvalds * @dev: device going away. 35641da177e4SLinus Torvalds * 35651da177e4SLinus Torvalds * We do this in two parts, like we do device_register(). First, 35661da177e4SLinus Torvalds * we remove it from all the subsystems with device_del(), then 35671da177e4SLinus Torvalds * we decrement the reference count via put_device(). If that 35681da177e4SLinus Torvalds * is the final reference count, the device will be cleaned up 35691da177e4SLinus Torvalds * via device_release() above. Otherwise, the structure will 35701da177e4SLinus Torvalds * stick around until the final reference to the device is dropped. 35711da177e4SLinus Torvalds */ 35721da177e4SLinus Torvalds void device_unregister(struct device *dev) 35731da177e4SLinus Torvalds { 35741e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 35751da177e4SLinus Torvalds device_del(dev); 35761da177e4SLinus Torvalds put_device(dev); 35771da177e4SLinus Torvalds } 357886df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_unregister); 35791da177e4SLinus Torvalds 35803d060aebSAndy Shevchenko static struct device *prev_device(struct klist_iter *i) 35813d060aebSAndy Shevchenko { 35823d060aebSAndy Shevchenko struct klist_node *n = klist_prev(i); 35833d060aebSAndy Shevchenko struct device *dev = NULL; 35843d060aebSAndy Shevchenko struct device_private *p; 35853d060aebSAndy Shevchenko 35863d060aebSAndy Shevchenko if (n) { 35873d060aebSAndy Shevchenko p = to_device_private_parent(n); 35883d060aebSAndy Shevchenko dev = p->device; 35893d060aebSAndy Shevchenko } 35903d060aebSAndy Shevchenko return dev; 35913d060aebSAndy Shevchenko } 35923d060aebSAndy Shevchenko 359336239577Smochel@digitalimplant.org static struct device *next_device(struct klist_iter *i) 359436239577Smochel@digitalimplant.org { 359536239577Smochel@digitalimplant.org struct klist_node *n = klist_next(i); 3596f791b8c8SGreg Kroah-Hartman struct device *dev = NULL; 3597f791b8c8SGreg Kroah-Hartman struct device_private *p; 3598f791b8c8SGreg Kroah-Hartman 3599f791b8c8SGreg Kroah-Hartman if (n) { 3600f791b8c8SGreg Kroah-Hartman p = to_device_private_parent(n); 3601f791b8c8SGreg Kroah-Hartman dev = p->device; 3602f791b8c8SGreg Kroah-Hartman } 3603f791b8c8SGreg Kroah-Hartman return dev; 360436239577Smochel@digitalimplant.org } 360536239577Smochel@digitalimplant.org 36061da177e4SLinus Torvalds /** 3607e454cea2SKay Sievers * device_get_devnode - path of device node file 36086fcf53acSKay Sievers * @dev: device 3609e454cea2SKay Sievers * @mode: returned file access mode 36103c2670e6SKay Sievers * @uid: returned file owner 36113c2670e6SKay Sievers * @gid: returned file group 36126fcf53acSKay Sievers * @tmp: possibly allocated string 36136fcf53acSKay Sievers * 36146fcf53acSKay Sievers * Return the relative path of a possible device node. 36156fcf53acSKay Sievers * Non-default names may need to allocate a memory to compose 36166fcf53acSKay Sievers * a name. This memory is returned in tmp and needs to be 36176fcf53acSKay Sievers * freed by the caller. 36186fcf53acSKay Sievers */ 3619e454cea2SKay Sievers const char *device_get_devnode(struct device *dev, 36204e4098a3SGreg Kroah-Hartman umode_t *mode, kuid_t *uid, kgid_t *gid, 36213c2670e6SKay Sievers const char **tmp) 36226fcf53acSKay Sievers { 36236fcf53acSKay Sievers char *s; 36246fcf53acSKay Sievers 36256fcf53acSKay Sievers *tmp = NULL; 36266fcf53acSKay Sievers 36276fcf53acSKay Sievers /* the device type may provide a specific name */ 3628e454cea2SKay Sievers if (dev->type && dev->type->devnode) 36293c2670e6SKay Sievers *tmp = dev->type->devnode(dev, mode, uid, gid); 36306fcf53acSKay Sievers if (*tmp) 36316fcf53acSKay Sievers return *tmp; 36326fcf53acSKay Sievers 36336fcf53acSKay Sievers /* the class may provide a specific name */ 3634e454cea2SKay Sievers if (dev->class && dev->class->devnode) 3635e454cea2SKay Sievers *tmp = dev->class->devnode(dev, mode); 36366fcf53acSKay Sievers if (*tmp) 36376fcf53acSKay Sievers return *tmp; 36386fcf53acSKay Sievers 36396fcf53acSKay Sievers /* return name without allocation, tmp == NULL */ 36406fcf53acSKay Sievers if (strchr(dev_name(dev), '!') == NULL) 36416fcf53acSKay Sievers return dev_name(dev); 36426fcf53acSKay Sievers 36436fcf53acSKay Sievers /* replace '!' in the name with '/' */ 3644a29fd614SRasmus Villemoes s = kstrdup(dev_name(dev), GFP_KERNEL); 3645a29fd614SRasmus Villemoes if (!s) 36466fcf53acSKay Sievers return NULL; 3647a29fd614SRasmus Villemoes strreplace(s, '!', '/'); 3648a29fd614SRasmus Villemoes return *tmp = s; 36496fcf53acSKay Sievers } 36506fcf53acSKay Sievers 36516fcf53acSKay Sievers /** 36521da177e4SLinus Torvalds * device_for_each_child - device child iterator. 3653c41455fbSRandy Dunlap * @parent: parent struct device. 36541da177e4SLinus Torvalds * @fn: function to be called for each device. 3655f8878dcbSRobert P. J. Day * @data: data for the callback. 36561da177e4SLinus Torvalds * 3657c41455fbSRandy Dunlap * Iterate over @parent's child devices, and call @fn for each, 36581da177e4SLinus Torvalds * passing it @data. 36591da177e4SLinus Torvalds * 36601da177e4SLinus Torvalds * We check the return of @fn each time. If it returns anything 36611da177e4SLinus Torvalds * other than 0, we break out and return that value. 36621da177e4SLinus Torvalds */ 366336239577Smochel@digitalimplant.org int device_for_each_child(struct device *parent, void *data, 36644a3ad20cSGreg Kroah-Hartman int (*fn)(struct device *dev, void *data)) 36651da177e4SLinus Torvalds { 366636239577Smochel@digitalimplant.org struct klist_iter i; 36671da177e4SLinus Torvalds struct device *child; 36681da177e4SLinus Torvalds int error = 0; 36691da177e4SLinus Torvalds 3670014c90dbSGreg Kroah-Hartman if (!parent->p) 3671014c90dbSGreg Kroah-Hartman return 0; 3672014c90dbSGreg Kroah-Hartman 3673f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 367493ead7c9SGimcuan Hui while (!error && (child = next_device(&i))) 367536239577Smochel@digitalimplant.org error = fn(child, data); 367636239577Smochel@digitalimplant.org klist_iter_exit(&i); 36771da177e4SLinus Torvalds return error; 36781da177e4SLinus Torvalds } 367986df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_for_each_child); 36801da177e4SLinus Torvalds 36815ab69981SCornelia Huck /** 36823d060aebSAndy Shevchenko * device_for_each_child_reverse - device child iterator in reversed order. 36833d060aebSAndy Shevchenko * @parent: parent struct device. 36843d060aebSAndy Shevchenko * @fn: function to be called for each device. 36853d060aebSAndy Shevchenko * @data: data for the callback. 36863d060aebSAndy Shevchenko * 36873d060aebSAndy Shevchenko * Iterate over @parent's child devices, and call @fn for each, 36883d060aebSAndy Shevchenko * passing it @data. 36893d060aebSAndy Shevchenko * 36903d060aebSAndy Shevchenko * We check the return of @fn each time. If it returns anything 36913d060aebSAndy Shevchenko * other than 0, we break out and return that value. 36923d060aebSAndy Shevchenko */ 36933d060aebSAndy Shevchenko int device_for_each_child_reverse(struct device *parent, void *data, 36943d060aebSAndy Shevchenko int (*fn)(struct device *dev, void *data)) 36953d060aebSAndy Shevchenko { 36963d060aebSAndy Shevchenko struct klist_iter i; 36973d060aebSAndy Shevchenko struct device *child; 36983d060aebSAndy Shevchenko int error = 0; 36993d060aebSAndy Shevchenko 37003d060aebSAndy Shevchenko if (!parent->p) 37013d060aebSAndy Shevchenko return 0; 37023d060aebSAndy Shevchenko 37033d060aebSAndy Shevchenko klist_iter_init(&parent->p->klist_children, &i); 37043d060aebSAndy Shevchenko while ((child = prev_device(&i)) && !error) 37053d060aebSAndy Shevchenko error = fn(child, data); 37063d060aebSAndy Shevchenko klist_iter_exit(&i); 37073d060aebSAndy Shevchenko return error; 37083d060aebSAndy Shevchenko } 37093d060aebSAndy Shevchenko EXPORT_SYMBOL_GPL(device_for_each_child_reverse); 37103d060aebSAndy Shevchenko 37113d060aebSAndy Shevchenko /** 37125ab69981SCornelia Huck * device_find_child - device iterator for locating a particular device. 37135ab69981SCornelia Huck * @parent: parent struct device 37145ab69981SCornelia Huck * @match: Callback function to check device 3715f8878dcbSRobert P. J. Day * @data: Data to pass to match function 37165ab69981SCornelia Huck * 37175ab69981SCornelia Huck * This is similar to the device_for_each_child() function above, but it 37185ab69981SCornelia Huck * returns a reference to a device that is 'found' for later use, as 37195ab69981SCornelia Huck * determined by the @match callback. 37205ab69981SCornelia Huck * 37215ab69981SCornelia Huck * The callback should return 0 if the device doesn't match and non-zero 37225ab69981SCornelia Huck * if it does. If the callback returns non-zero and a reference to the 37235ab69981SCornelia Huck * current device can be obtained, this function will return to the caller 37245ab69981SCornelia Huck * and not iterate over any more devices. 3725a4e2400aSFederico Vaga * 3726a4e2400aSFederico Vaga * NOTE: you will need to drop the reference with put_device() after use. 37275ab69981SCornelia Huck */ 37285ab69981SCornelia Huck struct device *device_find_child(struct device *parent, void *data, 37294a3ad20cSGreg Kroah-Hartman int (*match)(struct device *dev, void *data)) 37305ab69981SCornelia Huck { 37315ab69981SCornelia Huck struct klist_iter i; 37325ab69981SCornelia Huck struct device *child; 37335ab69981SCornelia Huck 37345ab69981SCornelia Huck if (!parent) 37355ab69981SCornelia Huck return NULL; 37365ab69981SCornelia Huck 3737f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 37385ab69981SCornelia Huck while ((child = next_device(&i))) 37395ab69981SCornelia Huck if (match(child, data) && get_device(child)) 37405ab69981SCornelia Huck break; 37415ab69981SCornelia Huck klist_iter_exit(&i); 37425ab69981SCornelia Huck return child; 37435ab69981SCornelia Huck } 374486df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_find_child); 37455ab69981SCornelia Huck 3746dad9bb01SHeikki Krogerus /** 3747dad9bb01SHeikki Krogerus * device_find_child_by_name - device iterator for locating a child device. 3748dad9bb01SHeikki Krogerus * @parent: parent struct device 3749dad9bb01SHeikki Krogerus * @name: name of the child device 3750dad9bb01SHeikki Krogerus * 3751dad9bb01SHeikki Krogerus * This is similar to the device_find_child() function above, but it 3752dad9bb01SHeikki Krogerus * returns a reference to a device that has the name @name. 3753dad9bb01SHeikki Krogerus * 3754dad9bb01SHeikki Krogerus * NOTE: you will need to drop the reference with put_device() after use. 3755dad9bb01SHeikki Krogerus */ 3756dad9bb01SHeikki Krogerus struct device *device_find_child_by_name(struct device *parent, 3757dad9bb01SHeikki Krogerus const char *name) 3758dad9bb01SHeikki Krogerus { 3759dad9bb01SHeikki Krogerus struct klist_iter i; 3760dad9bb01SHeikki Krogerus struct device *child; 3761dad9bb01SHeikki Krogerus 3762dad9bb01SHeikki Krogerus if (!parent) 3763dad9bb01SHeikki Krogerus return NULL; 3764dad9bb01SHeikki Krogerus 3765dad9bb01SHeikki Krogerus klist_iter_init(&parent->p->klist_children, &i); 3766dad9bb01SHeikki Krogerus while ((child = next_device(&i))) 3767c77f520dSDan Williams if (sysfs_streq(dev_name(child), name) && get_device(child)) 3768dad9bb01SHeikki Krogerus break; 3769dad9bb01SHeikki Krogerus klist_iter_exit(&i); 3770dad9bb01SHeikki Krogerus return child; 3771dad9bb01SHeikki Krogerus } 3772dad9bb01SHeikki Krogerus EXPORT_SYMBOL_GPL(device_find_child_by_name); 3773dad9bb01SHeikki Krogerus 37741da177e4SLinus Torvalds int __init devices_init(void) 37751da177e4SLinus Torvalds { 3776881c6cfdSGreg Kroah-Hartman devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); 3777881c6cfdSGreg Kroah-Hartman if (!devices_kset) 3778881c6cfdSGreg Kroah-Hartman return -ENOMEM; 3779e105b8bfSDan Williams dev_kobj = kobject_create_and_add("dev", NULL); 3780e105b8bfSDan Williams if (!dev_kobj) 3781e105b8bfSDan Williams goto dev_kobj_err; 3782e105b8bfSDan Williams sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); 3783e105b8bfSDan Williams if (!sysfs_dev_block_kobj) 3784e105b8bfSDan Williams goto block_kobj_err; 3785e105b8bfSDan Williams sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); 3786e105b8bfSDan Williams if (!sysfs_dev_char_kobj) 3787e105b8bfSDan Williams goto char_kobj_err; 3788e105b8bfSDan Williams 3789881c6cfdSGreg Kroah-Hartman return 0; 3790e105b8bfSDan Williams 3791e105b8bfSDan Williams char_kobj_err: 3792e105b8bfSDan Williams kobject_put(sysfs_dev_block_kobj); 3793e105b8bfSDan Williams block_kobj_err: 3794e105b8bfSDan Williams kobject_put(dev_kobj); 3795e105b8bfSDan Williams dev_kobj_err: 3796e105b8bfSDan Williams kset_unregister(devices_kset); 3797e105b8bfSDan Williams return -ENOMEM; 37981da177e4SLinus Torvalds } 37991da177e4SLinus Torvalds 38004f3549d7SRafael J. Wysocki static int device_check_offline(struct device *dev, void *not_used) 38014f3549d7SRafael J. Wysocki { 38024f3549d7SRafael J. Wysocki int ret; 38034f3549d7SRafael J. Wysocki 38044f3549d7SRafael J. Wysocki ret = device_for_each_child(dev, NULL, device_check_offline); 38054f3549d7SRafael J. Wysocki if (ret) 38064f3549d7SRafael J. Wysocki return ret; 38074f3549d7SRafael J. Wysocki 38084f3549d7SRafael J. Wysocki return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; 38094f3549d7SRafael J. Wysocki } 38104f3549d7SRafael J. Wysocki 38114f3549d7SRafael J. Wysocki /** 38124f3549d7SRafael J. Wysocki * device_offline - Prepare the device for hot-removal. 38134f3549d7SRafael J. Wysocki * @dev: Device to be put offline. 38144f3549d7SRafael J. Wysocki * 38154f3549d7SRafael J. Wysocki * Execute the device bus type's .offline() callback, if present, to prepare 38164f3549d7SRafael J. Wysocki * the device for a subsequent hot-removal. If that succeeds, the device must 38174f3549d7SRafael J. Wysocki * not be used until either it is removed or its bus type's .online() callback 38184f3549d7SRafael J. Wysocki * is executed. 38194f3549d7SRafael J. Wysocki * 38204f3549d7SRafael J. Wysocki * Call under device_hotplug_lock. 38214f3549d7SRafael J. Wysocki */ 38224f3549d7SRafael J. Wysocki int device_offline(struct device *dev) 38234f3549d7SRafael J. Wysocki { 38244f3549d7SRafael J. Wysocki int ret; 38254f3549d7SRafael J. Wysocki 38264f3549d7SRafael J. Wysocki if (dev->offline_disabled) 38274f3549d7SRafael J. Wysocki return -EPERM; 38284f3549d7SRafael J. Wysocki 38294f3549d7SRafael J. Wysocki ret = device_for_each_child(dev, NULL, device_check_offline); 38304f3549d7SRafael J. Wysocki if (ret) 38314f3549d7SRafael J. Wysocki return ret; 38324f3549d7SRafael J. Wysocki 38334f3549d7SRafael J. Wysocki device_lock(dev); 38344f3549d7SRafael J. Wysocki if (device_supports_offline(dev)) { 38354f3549d7SRafael J. Wysocki if (dev->offline) { 38364f3549d7SRafael J. Wysocki ret = 1; 38374f3549d7SRafael J. Wysocki } else { 38384f3549d7SRafael J. Wysocki ret = dev->bus->offline(dev); 38394f3549d7SRafael J. Wysocki if (!ret) { 38404f3549d7SRafael J. Wysocki kobject_uevent(&dev->kobj, KOBJ_OFFLINE); 38414f3549d7SRafael J. Wysocki dev->offline = true; 38424f3549d7SRafael J. Wysocki } 38434f3549d7SRafael J. Wysocki } 38444f3549d7SRafael J. Wysocki } 38454f3549d7SRafael J. Wysocki device_unlock(dev); 38464f3549d7SRafael J. Wysocki 38474f3549d7SRafael J. Wysocki return ret; 38484f3549d7SRafael J. Wysocki } 38494f3549d7SRafael J. Wysocki 38504f3549d7SRafael J. Wysocki /** 38514f3549d7SRafael J. Wysocki * device_online - Put the device back online after successful device_offline(). 38524f3549d7SRafael J. Wysocki * @dev: Device to be put back online. 38534f3549d7SRafael J. Wysocki * 38544f3549d7SRafael J. Wysocki * If device_offline() has been successfully executed for @dev, but the device 38554f3549d7SRafael J. Wysocki * has not been removed subsequently, execute its bus type's .online() callback 38564f3549d7SRafael J. Wysocki * to indicate that the device can be used again. 38574f3549d7SRafael J. Wysocki * 38584f3549d7SRafael J. Wysocki * Call under device_hotplug_lock. 38594f3549d7SRafael J. Wysocki */ 38604f3549d7SRafael J. Wysocki int device_online(struct device *dev) 38614f3549d7SRafael J. Wysocki { 38624f3549d7SRafael J. Wysocki int ret = 0; 38634f3549d7SRafael J. Wysocki 38644f3549d7SRafael J. Wysocki device_lock(dev); 38654f3549d7SRafael J. Wysocki if (device_supports_offline(dev)) { 38664f3549d7SRafael J. Wysocki if (dev->offline) { 38674f3549d7SRafael J. Wysocki ret = dev->bus->online(dev); 38684f3549d7SRafael J. Wysocki if (!ret) { 38694f3549d7SRafael J. Wysocki kobject_uevent(&dev->kobj, KOBJ_ONLINE); 38704f3549d7SRafael J. Wysocki dev->offline = false; 38714f3549d7SRafael J. Wysocki } 38724f3549d7SRafael J. Wysocki } else { 38734f3549d7SRafael J. Wysocki ret = 1; 38744f3549d7SRafael J. Wysocki } 38754f3549d7SRafael J. Wysocki } 38764f3549d7SRafael J. Wysocki device_unlock(dev); 38774f3549d7SRafael J. Wysocki 38784f3549d7SRafael J. Wysocki return ret; 38794f3549d7SRafael J. Wysocki } 38804f3549d7SRafael J. Wysocki 38817f100d15SKarthigan Srinivasan struct root_device { 38820aa0dc41SMark McLoughlin struct device dev; 38830aa0dc41SMark McLoughlin struct module *owner; 38840aa0dc41SMark McLoughlin }; 38850aa0dc41SMark McLoughlin 388693058424SJosh Triplett static inline struct root_device *to_root_device(struct device *d) 3887481e2079SFerenc Wagner { 3888481e2079SFerenc Wagner return container_of(d, struct root_device, dev); 3889481e2079SFerenc Wagner } 38900aa0dc41SMark McLoughlin 38910aa0dc41SMark McLoughlin static void root_device_release(struct device *dev) 38920aa0dc41SMark McLoughlin { 38930aa0dc41SMark McLoughlin kfree(to_root_device(dev)); 38940aa0dc41SMark McLoughlin } 38950aa0dc41SMark McLoughlin 38960aa0dc41SMark McLoughlin /** 38970aa0dc41SMark McLoughlin * __root_device_register - allocate and register a root device 38980aa0dc41SMark McLoughlin * @name: root device name 38990aa0dc41SMark McLoughlin * @owner: owner module of the root device, usually THIS_MODULE 39000aa0dc41SMark McLoughlin * 39010aa0dc41SMark McLoughlin * This function allocates a root device and registers it 39020aa0dc41SMark McLoughlin * using device_register(). In order to free the returned 39030aa0dc41SMark McLoughlin * device, use root_device_unregister(). 39040aa0dc41SMark McLoughlin * 39050aa0dc41SMark McLoughlin * Root devices are dummy devices which allow other devices 39060aa0dc41SMark McLoughlin * to be grouped under /sys/devices. Use this function to 39070aa0dc41SMark McLoughlin * allocate a root device and then use it as the parent of 39080aa0dc41SMark McLoughlin * any device which should appear under /sys/devices/{name} 39090aa0dc41SMark McLoughlin * 39100aa0dc41SMark McLoughlin * The /sys/devices/{name} directory will also contain a 39110aa0dc41SMark McLoughlin * 'module' symlink which points to the @owner directory 39120aa0dc41SMark McLoughlin * in sysfs. 39130aa0dc41SMark McLoughlin * 3914f0eae0edSJani Nikula * Returns &struct device pointer on success, or ERR_PTR() on error. 3915f0eae0edSJani Nikula * 39160aa0dc41SMark McLoughlin * Note: You probably want to use root_device_register(). 39170aa0dc41SMark McLoughlin */ 39180aa0dc41SMark McLoughlin struct device *__root_device_register(const char *name, struct module *owner) 39190aa0dc41SMark McLoughlin { 39200aa0dc41SMark McLoughlin struct root_device *root; 39210aa0dc41SMark McLoughlin int err = -ENOMEM; 39220aa0dc41SMark McLoughlin 39230aa0dc41SMark McLoughlin root = kzalloc(sizeof(struct root_device), GFP_KERNEL); 39240aa0dc41SMark McLoughlin if (!root) 39250aa0dc41SMark McLoughlin return ERR_PTR(err); 39260aa0dc41SMark McLoughlin 3927acc0e90fSGreg Kroah-Hartman err = dev_set_name(&root->dev, "%s", name); 39280aa0dc41SMark McLoughlin if (err) { 39290aa0dc41SMark McLoughlin kfree(root); 39300aa0dc41SMark McLoughlin return ERR_PTR(err); 39310aa0dc41SMark McLoughlin } 39320aa0dc41SMark McLoughlin 39330aa0dc41SMark McLoughlin root->dev.release = root_device_release; 39340aa0dc41SMark McLoughlin 39350aa0dc41SMark McLoughlin err = device_register(&root->dev); 39360aa0dc41SMark McLoughlin if (err) { 39370aa0dc41SMark McLoughlin put_device(&root->dev); 39380aa0dc41SMark McLoughlin return ERR_PTR(err); 39390aa0dc41SMark McLoughlin } 39400aa0dc41SMark McLoughlin 39411d9e882bSChristoph Egger #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ 39420aa0dc41SMark McLoughlin if (owner) { 39430aa0dc41SMark McLoughlin struct module_kobject *mk = &owner->mkobj; 39440aa0dc41SMark McLoughlin 39450aa0dc41SMark McLoughlin err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); 39460aa0dc41SMark McLoughlin if (err) { 39470aa0dc41SMark McLoughlin device_unregister(&root->dev); 39480aa0dc41SMark McLoughlin return ERR_PTR(err); 39490aa0dc41SMark McLoughlin } 39500aa0dc41SMark McLoughlin root->owner = owner; 39510aa0dc41SMark McLoughlin } 39520aa0dc41SMark McLoughlin #endif 39530aa0dc41SMark McLoughlin 39540aa0dc41SMark McLoughlin return &root->dev; 39550aa0dc41SMark McLoughlin } 39560aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(__root_device_register); 39570aa0dc41SMark McLoughlin 39580aa0dc41SMark McLoughlin /** 39590aa0dc41SMark McLoughlin * root_device_unregister - unregister and free a root device 39607cbcf225SRandy Dunlap * @dev: device going away 39610aa0dc41SMark McLoughlin * 39620aa0dc41SMark McLoughlin * This function unregisters and cleans up a device that was created by 39630aa0dc41SMark McLoughlin * root_device_register(). 39640aa0dc41SMark McLoughlin */ 39650aa0dc41SMark McLoughlin void root_device_unregister(struct device *dev) 39660aa0dc41SMark McLoughlin { 39670aa0dc41SMark McLoughlin struct root_device *root = to_root_device(dev); 39680aa0dc41SMark McLoughlin 39690aa0dc41SMark McLoughlin if (root->owner) 39700aa0dc41SMark McLoughlin sysfs_remove_link(&root->dev.kobj, "module"); 39710aa0dc41SMark McLoughlin 39720aa0dc41SMark McLoughlin device_unregister(dev); 39730aa0dc41SMark McLoughlin } 39740aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(root_device_unregister); 39750aa0dc41SMark McLoughlin 397623681e47SGreg Kroah-Hartman 397723681e47SGreg Kroah-Hartman static void device_create_release(struct device *dev) 397823681e47SGreg Kroah-Hartman { 39791e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 398023681e47SGreg Kroah-Hartman kfree(dev); 398123681e47SGreg Kroah-Hartman } 398223681e47SGreg Kroah-Hartman 39836a8b55d7SMathieu Malaterre static __printf(6, 0) struct device * 398439ef3112SGuenter Roeck device_create_groups_vargs(struct class *class, struct device *parent, 398539ef3112SGuenter Roeck dev_t devt, void *drvdata, 398639ef3112SGuenter Roeck const struct attribute_group **groups, 398739ef3112SGuenter Roeck const char *fmt, va_list args) 398839ef3112SGuenter Roeck { 398939ef3112SGuenter Roeck struct device *dev = NULL; 399039ef3112SGuenter Roeck int retval = -ENODEV; 399139ef3112SGuenter Roeck 399239ef3112SGuenter Roeck if (class == NULL || IS_ERR(class)) 399339ef3112SGuenter Roeck goto error; 399439ef3112SGuenter Roeck 399539ef3112SGuenter Roeck dev = kzalloc(sizeof(*dev), GFP_KERNEL); 399639ef3112SGuenter Roeck if (!dev) { 399739ef3112SGuenter Roeck retval = -ENOMEM; 399839ef3112SGuenter Roeck goto error; 399939ef3112SGuenter Roeck } 400039ef3112SGuenter Roeck 4001bbc780f8SDavid Herrmann device_initialize(dev); 400239ef3112SGuenter Roeck dev->devt = devt; 400339ef3112SGuenter Roeck dev->class = class; 400439ef3112SGuenter Roeck dev->parent = parent; 400539ef3112SGuenter Roeck dev->groups = groups; 400639ef3112SGuenter Roeck dev->release = device_create_release; 400739ef3112SGuenter Roeck dev_set_drvdata(dev, drvdata); 400839ef3112SGuenter Roeck 400939ef3112SGuenter Roeck retval = kobject_set_name_vargs(&dev->kobj, fmt, args); 401039ef3112SGuenter Roeck if (retval) 401139ef3112SGuenter Roeck goto error; 401239ef3112SGuenter Roeck 4013bbc780f8SDavid Herrmann retval = device_add(dev); 401439ef3112SGuenter Roeck if (retval) 401539ef3112SGuenter Roeck goto error; 401639ef3112SGuenter Roeck 401739ef3112SGuenter Roeck return dev; 401839ef3112SGuenter Roeck 401939ef3112SGuenter Roeck error: 402039ef3112SGuenter Roeck put_device(dev); 402139ef3112SGuenter Roeck return ERR_PTR(retval); 402239ef3112SGuenter Roeck } 402339ef3112SGuenter Roeck 402423681e47SGreg Kroah-Hartman /** 40254e106739SGreg Kroah-Hartman * device_create - creates a device and registers it with sysfs 40268882b394SGreg Kroah-Hartman * @class: pointer to the struct class that this device should be registered to 40278882b394SGreg Kroah-Hartman * @parent: pointer to the parent struct device of this new device, if any 40288882b394SGreg Kroah-Hartman * @devt: the dev_t for the char device to be added 40298882b394SGreg Kroah-Hartman * @drvdata: the data to be added to the device for callbacks 40308882b394SGreg Kroah-Hartman * @fmt: string for the device's name 40318882b394SGreg Kroah-Hartman * 40328882b394SGreg Kroah-Hartman * This function can be used by char device classes. A struct device 40338882b394SGreg Kroah-Hartman * will be created in sysfs, registered to the specified class. 40348882b394SGreg Kroah-Hartman * 40358882b394SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 40368882b394SGreg Kroah-Hartman * the dev_t is not 0,0. 40378882b394SGreg Kroah-Hartman * If a pointer to a parent struct device is passed in, the newly created 40388882b394SGreg Kroah-Hartman * struct device will be a child of that device in sysfs. 40398882b394SGreg Kroah-Hartman * The pointer to the struct device will be returned from the call. 40408882b394SGreg Kroah-Hartman * Any further sysfs files that might be required can be created using this 40418882b394SGreg Kroah-Hartman * pointer. 40428882b394SGreg Kroah-Hartman * 4043f0eae0edSJani Nikula * Returns &struct device pointer on success, or ERR_PTR() on error. 4044f0eae0edSJani Nikula * 40458882b394SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 40468882b394SGreg Kroah-Hartman * been created with a call to class_create(). 40478882b394SGreg Kroah-Hartman */ 40484e106739SGreg Kroah-Hartman struct device *device_create(struct class *class, struct device *parent, 40494e106739SGreg Kroah-Hartman dev_t devt, void *drvdata, const char *fmt, ...) 40508882b394SGreg Kroah-Hartman { 40518882b394SGreg Kroah-Hartman va_list vargs; 40528882b394SGreg Kroah-Hartman struct device *dev; 40538882b394SGreg Kroah-Hartman 40548882b394SGreg Kroah-Hartman va_start(vargs, fmt); 40554c747466SChristoph Hellwig dev = device_create_groups_vargs(class, parent, devt, drvdata, NULL, 40564c747466SChristoph Hellwig fmt, vargs); 40578882b394SGreg Kroah-Hartman va_end(vargs); 40588882b394SGreg Kroah-Hartman return dev; 40598882b394SGreg Kroah-Hartman } 40604e106739SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create); 40618882b394SGreg Kroah-Hartman 406239ef3112SGuenter Roeck /** 406339ef3112SGuenter Roeck * device_create_with_groups - creates a device and registers it with sysfs 406439ef3112SGuenter Roeck * @class: pointer to the struct class that this device should be registered to 406539ef3112SGuenter Roeck * @parent: pointer to the parent struct device of this new device, if any 406639ef3112SGuenter Roeck * @devt: the dev_t for the char device to be added 406739ef3112SGuenter Roeck * @drvdata: the data to be added to the device for callbacks 406839ef3112SGuenter Roeck * @groups: NULL-terminated list of attribute groups to be created 406939ef3112SGuenter Roeck * @fmt: string for the device's name 407039ef3112SGuenter Roeck * 407139ef3112SGuenter Roeck * This function can be used by char device classes. A struct device 407239ef3112SGuenter Roeck * will be created in sysfs, registered to the specified class. 407339ef3112SGuenter Roeck * Additional attributes specified in the groups parameter will also 407439ef3112SGuenter Roeck * be created automatically. 407539ef3112SGuenter Roeck * 407639ef3112SGuenter Roeck * A "dev" file will be created, showing the dev_t for the device, if 407739ef3112SGuenter Roeck * the dev_t is not 0,0. 407839ef3112SGuenter Roeck * If a pointer to a parent struct device is passed in, the newly created 407939ef3112SGuenter Roeck * struct device will be a child of that device in sysfs. 408039ef3112SGuenter Roeck * The pointer to the struct device will be returned from the call. 408139ef3112SGuenter Roeck * Any further sysfs files that might be required can be created using this 408239ef3112SGuenter Roeck * pointer. 408339ef3112SGuenter Roeck * 408439ef3112SGuenter Roeck * Returns &struct device pointer on success, or ERR_PTR() on error. 408539ef3112SGuenter Roeck * 408639ef3112SGuenter Roeck * Note: the struct class passed to this function must have previously 408739ef3112SGuenter Roeck * been created with a call to class_create(). 408839ef3112SGuenter Roeck */ 408939ef3112SGuenter Roeck struct device *device_create_with_groups(struct class *class, 409039ef3112SGuenter Roeck struct device *parent, dev_t devt, 409139ef3112SGuenter Roeck void *drvdata, 409239ef3112SGuenter Roeck const struct attribute_group **groups, 409339ef3112SGuenter Roeck const char *fmt, ...) 409439ef3112SGuenter Roeck { 409539ef3112SGuenter Roeck va_list vargs; 409639ef3112SGuenter Roeck struct device *dev; 409739ef3112SGuenter Roeck 409839ef3112SGuenter Roeck va_start(vargs, fmt); 409939ef3112SGuenter Roeck dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, 410039ef3112SGuenter Roeck fmt, vargs); 410139ef3112SGuenter Roeck va_end(vargs); 410239ef3112SGuenter Roeck return dev; 410339ef3112SGuenter Roeck } 410439ef3112SGuenter Roeck EXPORT_SYMBOL_GPL(device_create_with_groups); 410539ef3112SGuenter Roeck 4106775b64d2SRafael J. Wysocki /** 4107775b64d2SRafael J. Wysocki * device_destroy - removes a device that was created with device_create() 4108775b64d2SRafael J. Wysocki * @class: pointer to the struct class that this device was registered with 4109775b64d2SRafael J. Wysocki * @devt: the dev_t of the device that was previously registered 4110775b64d2SRafael J. Wysocki * 4111775b64d2SRafael J. Wysocki * This call unregisters and cleans up a device that was created with a 4112775b64d2SRafael J. Wysocki * call to device_create(). 4113775b64d2SRafael J. Wysocki */ 4114775b64d2SRafael J. Wysocki void device_destroy(struct class *class, dev_t devt) 4115775b64d2SRafael J. Wysocki { 4116775b64d2SRafael J. Wysocki struct device *dev; 4117775b64d2SRafael J. Wysocki 41184495dfddSSuzuki K Poulose dev = class_find_device_by_devt(class, devt); 4119cd35449bSDave Young if (dev) { 4120cd35449bSDave Young put_device(dev); 412123681e47SGreg Kroah-Hartman device_unregister(dev); 412223681e47SGreg Kroah-Hartman } 4123cd35449bSDave Young } 412423681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_destroy); 4125a2de48caSGreg Kroah-Hartman 4126a2de48caSGreg Kroah-Hartman /** 4127a2de48caSGreg Kroah-Hartman * device_rename - renames a device 4128a2de48caSGreg Kroah-Hartman * @dev: the pointer to the struct device to be renamed 4129a2de48caSGreg Kroah-Hartman * @new_name: the new name of the device 4130030c1d2bSEric W. Biederman * 4131030c1d2bSEric W. Biederman * It is the responsibility of the caller to provide mutual 4132030c1d2bSEric W. Biederman * exclusion between two different calls of device_rename 4133030c1d2bSEric W. Biederman * on the same device to ensure that new_name is valid and 4134030c1d2bSEric W. Biederman * won't conflict with other devices. 4135c6c0ac66SMichael Ellerman * 4136a5462516STimur Tabi * Note: Don't call this function. Currently, the networking layer calls this 4137a5462516STimur Tabi * function, but that will change. The following text from Kay Sievers offers 4138a5462516STimur Tabi * some insight: 4139a5462516STimur Tabi * 4140a5462516STimur Tabi * Renaming devices is racy at many levels, symlinks and other stuff are not 4141a5462516STimur Tabi * replaced atomically, and you get a "move" uevent, but it's not easy to 4142a5462516STimur Tabi * connect the event to the old and new device. Device nodes are not renamed at 4143a5462516STimur Tabi * all, there isn't even support for that in the kernel now. 4144a5462516STimur Tabi * 4145a5462516STimur Tabi * In the meantime, during renaming, your target name might be taken by another 4146a5462516STimur Tabi * driver, creating conflicts. Or the old name is taken directly after you 4147a5462516STimur Tabi * renamed it -- then you get events for the same DEVPATH, before you even see 4148a5462516STimur Tabi * the "move" event. It's just a mess, and nothing new should ever rely on 4149a5462516STimur Tabi * kernel device renaming. Besides that, it's not even implemented now for 4150a5462516STimur Tabi * other things than (driver-core wise very simple) network devices. 4151a5462516STimur Tabi * 4152a5462516STimur Tabi * We are currently about to change network renaming in udev to completely 4153a5462516STimur Tabi * disallow renaming of devices in the same namespace as the kernel uses, 4154a5462516STimur Tabi * because we can't solve the problems properly, that arise with swapping names 4155a5462516STimur Tabi * of multiple interfaces without races. Means, renaming of eth[0-9]* will only 4156a5462516STimur Tabi * be allowed to some other name than eth[0-9]*, for the aforementioned 4157a5462516STimur Tabi * reasons. 4158a5462516STimur Tabi * 4159a5462516STimur Tabi * Make up a "real" name in the driver before you register anything, or add 4160a5462516STimur Tabi * some other attributes for userspace to find the device, or use udev to add 4161a5462516STimur Tabi * symlinks -- but never rename kernel devices later, it's a complete mess. We 4162a5462516STimur Tabi * don't even want to get into that and try to implement the missing pieces in 4163a5462516STimur Tabi * the core. We really have other pieces to fix in the driver core mess. :) 4164a2de48caSGreg Kroah-Hartman */ 41656937e8f8SJohannes Berg int device_rename(struct device *dev, const char *new_name) 4166a2de48caSGreg Kroah-Hartman { 41674b30ee58STejun Heo struct kobject *kobj = &dev->kobj; 41682ee97cafSCornelia Huck char *old_device_name = NULL; 4169a2de48caSGreg Kroah-Hartman int error; 4170a2de48caSGreg Kroah-Hartman 4171a2de48caSGreg Kroah-Hartman dev = get_device(dev); 4172a2de48caSGreg Kroah-Hartman if (!dev) 4173a2de48caSGreg Kroah-Hartman return -EINVAL; 4174a2de48caSGreg Kroah-Hartman 417569df7533Sethan.zhao dev_dbg(dev, "renaming to %s\n", new_name); 4176a2de48caSGreg Kroah-Hartman 41771fa5ae85SKay Sievers old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); 41782ee97cafSCornelia Huck if (!old_device_name) { 4179952ab431SJesper Juhl error = -ENOMEM; 41802ee97cafSCornelia Huck goto out; 4181952ab431SJesper Juhl } 4182a2de48caSGreg Kroah-Hartman 4183f349cf34SEric W. Biederman if (dev->class) { 41844b30ee58STejun Heo error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, 41854b30ee58STejun Heo kobj, old_device_name, 41864b30ee58STejun Heo new_name, kobject_namespace(kobj)); 4187f349cf34SEric W. Biederman if (error) 4188f349cf34SEric W. Biederman goto out; 4189f349cf34SEric W. Biederman } 419039aba963SKay Sievers 41914b30ee58STejun Heo error = kobject_rename(kobj, new_name); 41921fa5ae85SKay Sievers if (error) 41932ee97cafSCornelia Huck goto out; 4194a2de48caSGreg Kroah-Hartman 41952ee97cafSCornelia Huck out: 4196a2de48caSGreg Kroah-Hartman put_device(dev); 4197a2de48caSGreg Kroah-Hartman 41982ee97cafSCornelia Huck kfree(old_device_name); 4199a2de48caSGreg Kroah-Hartman 4200a2de48caSGreg Kroah-Hartman return error; 4201a2de48caSGreg Kroah-Hartman } 4202a2807dbcSJohannes Berg EXPORT_SYMBOL_GPL(device_rename); 42038a82472fSCornelia Huck 42048a82472fSCornelia Huck static int device_move_class_links(struct device *dev, 42058a82472fSCornelia Huck struct device *old_parent, 42068a82472fSCornelia Huck struct device *new_parent) 42078a82472fSCornelia Huck { 4208f7f3461dSGreg Kroah-Hartman int error = 0; 42098a82472fSCornelia Huck 4210f7f3461dSGreg Kroah-Hartman if (old_parent) 4211f7f3461dSGreg Kroah-Hartman sysfs_remove_link(&dev->kobj, "device"); 4212f7f3461dSGreg Kroah-Hartman if (new_parent) 4213f7f3461dSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 4214f7f3461dSGreg Kroah-Hartman "device"); 4215f7f3461dSGreg Kroah-Hartman return error; 42168a82472fSCornelia Huck } 42178a82472fSCornelia Huck 42188a82472fSCornelia Huck /** 42198a82472fSCornelia Huck * device_move - moves a device to a new parent 42208a82472fSCornelia Huck * @dev: the pointer to the struct device to be moved 422113509860SWolfram Sang * @new_parent: the new parent of the device (can be NULL) 4222ffa6a705SCornelia Huck * @dpm_order: how to reorder the dpm_list 42238a82472fSCornelia Huck */ 4224ffa6a705SCornelia Huck int device_move(struct device *dev, struct device *new_parent, 4225ffa6a705SCornelia Huck enum dpm_order dpm_order) 42268a82472fSCornelia Huck { 42278a82472fSCornelia Huck int error; 42288a82472fSCornelia Huck struct device *old_parent; 4229c744aeaeSCornelia Huck struct kobject *new_parent_kobj; 42308a82472fSCornelia Huck 42318a82472fSCornelia Huck dev = get_device(dev); 42328a82472fSCornelia Huck if (!dev) 42338a82472fSCornelia Huck return -EINVAL; 42348a82472fSCornelia Huck 4235ffa6a705SCornelia Huck device_pm_lock(); 42368a82472fSCornelia Huck new_parent = get_device(new_parent); 4237c744aeaeSCornelia Huck new_parent_kobj = get_device_parent(dev, new_parent); 423884d0c27dSTetsuo Handa if (IS_ERR(new_parent_kobj)) { 423984d0c27dSTetsuo Handa error = PTR_ERR(new_parent_kobj); 424084d0c27dSTetsuo Handa put_device(new_parent); 424184d0c27dSTetsuo Handa goto out; 424284d0c27dSTetsuo Handa } 424363b6971aSCornelia Huck 42441e0b2cf9SKay Sievers pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), 42451e0b2cf9SKay Sievers __func__, new_parent ? dev_name(new_parent) : "<NULL>"); 4246c744aeaeSCornelia Huck error = kobject_move(&dev->kobj, new_parent_kobj); 42478a82472fSCornelia Huck if (error) { 424863b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 42498a82472fSCornelia Huck put_device(new_parent); 42508a82472fSCornelia Huck goto out; 42518a82472fSCornelia Huck } 42528a82472fSCornelia Huck old_parent = dev->parent; 42538a82472fSCornelia Huck dev->parent = new_parent; 42548a82472fSCornelia Huck if (old_parent) 4255f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 42560d358f22SYinghai Lu if (new_parent) { 4257f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 4258f791b8c8SGreg Kroah-Hartman &new_parent->p->klist_children); 42590d358f22SYinghai Lu set_dev_node(dev, dev_to_node(new_parent)); 42600d358f22SYinghai Lu } 42610d358f22SYinghai Lu 4262bdd4034dSRabin Vincent if (dev->class) { 42638a82472fSCornelia Huck error = device_move_class_links(dev, old_parent, new_parent); 42648a82472fSCornelia Huck if (error) { 42658a82472fSCornelia Huck /* We ignore errors on cleanup since we're hosed anyway... */ 42668a82472fSCornelia Huck device_move_class_links(dev, new_parent, old_parent); 42678a82472fSCornelia Huck if (!kobject_move(&dev->kobj, &old_parent->kobj)) { 4268c744aeaeSCornelia Huck if (new_parent) 4269f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 42700d358f22SYinghai Lu dev->parent = old_parent; 42710d358f22SYinghai Lu if (old_parent) { 4272f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 4273f791b8c8SGreg Kroah-Hartman &old_parent->p->klist_children); 42740d358f22SYinghai Lu set_dev_node(dev, dev_to_node(old_parent)); 42750d358f22SYinghai Lu } 42768a82472fSCornelia Huck } 427763b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 42788a82472fSCornelia Huck put_device(new_parent); 42798a82472fSCornelia Huck goto out; 42808a82472fSCornelia Huck } 4281bdd4034dSRabin Vincent } 4282ffa6a705SCornelia Huck switch (dpm_order) { 4283ffa6a705SCornelia Huck case DPM_ORDER_NONE: 4284ffa6a705SCornelia Huck break; 4285ffa6a705SCornelia Huck case DPM_ORDER_DEV_AFTER_PARENT: 4286ffa6a705SCornelia Huck device_pm_move_after(dev, new_parent); 428752cdbdd4SGrygorii Strashko devices_kset_move_after(dev, new_parent); 4288ffa6a705SCornelia Huck break; 4289ffa6a705SCornelia Huck case DPM_ORDER_PARENT_BEFORE_DEV: 4290ffa6a705SCornelia Huck device_pm_move_before(new_parent, dev); 429152cdbdd4SGrygorii Strashko devices_kset_move_before(new_parent, dev); 4292ffa6a705SCornelia Huck break; 4293ffa6a705SCornelia Huck case DPM_ORDER_DEV_LAST: 4294ffa6a705SCornelia Huck device_pm_move_last(dev); 429552cdbdd4SGrygorii Strashko devices_kset_move_last(dev); 4296ffa6a705SCornelia Huck break; 4297ffa6a705SCornelia Huck } 4298bdd4034dSRabin Vincent 42998a82472fSCornelia Huck put_device(old_parent); 43008a82472fSCornelia Huck out: 4301ffa6a705SCornelia Huck device_pm_unlock(); 43028a82472fSCornelia Huck put_device(dev); 43038a82472fSCornelia Huck return error; 43048a82472fSCornelia Huck } 43058a82472fSCornelia Huck EXPORT_SYMBOL_GPL(device_move); 430637b0c020SGreg Kroah-Hartman 4307b8f33e5dSChristian Brauner static int device_attrs_change_owner(struct device *dev, kuid_t kuid, 4308b8f33e5dSChristian Brauner kgid_t kgid) 4309b8f33e5dSChristian Brauner { 4310b8f33e5dSChristian Brauner struct kobject *kobj = &dev->kobj; 4311b8f33e5dSChristian Brauner struct class *class = dev->class; 4312b8f33e5dSChristian Brauner const struct device_type *type = dev->type; 4313b8f33e5dSChristian Brauner int error; 4314b8f33e5dSChristian Brauner 4315b8f33e5dSChristian Brauner if (class) { 4316b8f33e5dSChristian Brauner /* 4317b8f33e5dSChristian Brauner * Change the device groups of the device class for @dev to 4318b8f33e5dSChristian Brauner * @kuid/@kgid. 4319b8f33e5dSChristian Brauner */ 4320b8f33e5dSChristian Brauner error = sysfs_groups_change_owner(kobj, class->dev_groups, kuid, 4321b8f33e5dSChristian Brauner kgid); 4322b8f33e5dSChristian Brauner if (error) 4323b8f33e5dSChristian Brauner return error; 4324b8f33e5dSChristian Brauner } 4325b8f33e5dSChristian Brauner 4326b8f33e5dSChristian Brauner if (type) { 4327b8f33e5dSChristian Brauner /* 4328b8f33e5dSChristian Brauner * Change the device groups of the device type for @dev to 4329b8f33e5dSChristian Brauner * @kuid/@kgid. 4330b8f33e5dSChristian Brauner */ 4331b8f33e5dSChristian Brauner error = sysfs_groups_change_owner(kobj, type->groups, kuid, 4332b8f33e5dSChristian Brauner kgid); 4333b8f33e5dSChristian Brauner if (error) 4334b8f33e5dSChristian Brauner return error; 4335b8f33e5dSChristian Brauner } 4336b8f33e5dSChristian Brauner 4337b8f33e5dSChristian Brauner /* Change the device groups of @dev to @kuid/@kgid. */ 4338b8f33e5dSChristian Brauner error = sysfs_groups_change_owner(kobj, dev->groups, kuid, kgid); 4339b8f33e5dSChristian Brauner if (error) 4340b8f33e5dSChristian Brauner return error; 4341b8f33e5dSChristian Brauner 4342b8f33e5dSChristian Brauner if (device_supports_offline(dev) && !dev->offline_disabled) { 4343b8f33e5dSChristian Brauner /* Change online device attributes of @dev to @kuid/@kgid. */ 4344b8f33e5dSChristian Brauner error = sysfs_file_change_owner(kobj, dev_attr_online.attr.name, 4345b8f33e5dSChristian Brauner kuid, kgid); 4346b8f33e5dSChristian Brauner if (error) 4347b8f33e5dSChristian Brauner return error; 4348b8f33e5dSChristian Brauner } 4349b8f33e5dSChristian Brauner 4350b8f33e5dSChristian Brauner return 0; 4351b8f33e5dSChristian Brauner } 4352b8f33e5dSChristian Brauner 4353b8f33e5dSChristian Brauner /** 4354b8f33e5dSChristian Brauner * device_change_owner - change the owner of an existing device. 4355b8f33e5dSChristian Brauner * @dev: device. 4356b8f33e5dSChristian Brauner * @kuid: new owner's kuid 4357b8f33e5dSChristian Brauner * @kgid: new owner's kgid 4358b8f33e5dSChristian Brauner * 4359b8f33e5dSChristian Brauner * This changes the owner of @dev and its corresponding sysfs entries to 4360b8f33e5dSChristian Brauner * @kuid/@kgid. This function closely mirrors how @dev was added via driver 4361b8f33e5dSChristian Brauner * core. 4362b8f33e5dSChristian Brauner * 4363b8f33e5dSChristian Brauner * Returns 0 on success or error code on failure. 4364b8f33e5dSChristian Brauner */ 4365b8f33e5dSChristian Brauner int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid) 4366b8f33e5dSChristian Brauner { 4367b8f33e5dSChristian Brauner int error; 4368b8f33e5dSChristian Brauner struct kobject *kobj = &dev->kobj; 4369b8f33e5dSChristian Brauner 4370b8f33e5dSChristian Brauner dev = get_device(dev); 4371b8f33e5dSChristian Brauner if (!dev) 4372b8f33e5dSChristian Brauner return -EINVAL; 4373b8f33e5dSChristian Brauner 4374b8f33e5dSChristian Brauner /* 4375b8f33e5dSChristian Brauner * Change the kobject and the default attributes and groups of the 4376b8f33e5dSChristian Brauner * ktype associated with it to @kuid/@kgid. 4377b8f33e5dSChristian Brauner */ 4378b8f33e5dSChristian Brauner error = sysfs_change_owner(kobj, kuid, kgid); 4379b8f33e5dSChristian Brauner if (error) 4380b8f33e5dSChristian Brauner goto out; 4381b8f33e5dSChristian Brauner 4382b8f33e5dSChristian Brauner /* 4383b8f33e5dSChristian Brauner * Change the uevent file for @dev to the new owner. The uevent file 4384b8f33e5dSChristian Brauner * was created in a separate step when @dev got added and we mirror 4385b8f33e5dSChristian Brauner * that step here. 4386b8f33e5dSChristian Brauner */ 4387b8f33e5dSChristian Brauner error = sysfs_file_change_owner(kobj, dev_attr_uevent.attr.name, kuid, 4388b8f33e5dSChristian Brauner kgid); 4389b8f33e5dSChristian Brauner if (error) 4390b8f33e5dSChristian Brauner goto out; 4391b8f33e5dSChristian Brauner 4392b8f33e5dSChristian Brauner /* 4393b8f33e5dSChristian Brauner * Change the device groups, the device groups associated with the 4394b8f33e5dSChristian Brauner * device class, and the groups associated with the device type of @dev 4395b8f33e5dSChristian Brauner * to @kuid/@kgid. 4396b8f33e5dSChristian Brauner */ 4397b8f33e5dSChristian Brauner error = device_attrs_change_owner(dev, kuid, kgid); 4398b8f33e5dSChristian Brauner if (error) 4399b8f33e5dSChristian Brauner goto out; 4400b8f33e5dSChristian Brauner 44013b52fc5dSChristian Brauner error = dpm_sysfs_change_owner(dev, kuid, kgid); 44023b52fc5dSChristian Brauner if (error) 44033b52fc5dSChristian Brauner goto out; 44043b52fc5dSChristian Brauner 4405b8f33e5dSChristian Brauner #ifdef CONFIG_BLOCK 4406b8f33e5dSChristian Brauner if (sysfs_deprecated && dev->class == &block_class) 4407b8f33e5dSChristian Brauner goto out; 4408b8f33e5dSChristian Brauner #endif 4409b8f33e5dSChristian Brauner 4410b8f33e5dSChristian Brauner /* 4411b8f33e5dSChristian Brauner * Change the owner of the symlink located in the class directory of 4412b8f33e5dSChristian Brauner * the device class associated with @dev which points to the actual 4413b8f33e5dSChristian Brauner * directory entry for @dev to @kuid/@kgid. This ensures that the 4414b8f33e5dSChristian Brauner * symlink shows the same permissions as its target. 4415b8f33e5dSChristian Brauner */ 4416b8f33e5dSChristian Brauner error = sysfs_link_change_owner(&dev->class->p->subsys.kobj, &dev->kobj, 4417b8f33e5dSChristian Brauner dev_name(dev), kuid, kgid); 4418b8f33e5dSChristian Brauner if (error) 4419b8f33e5dSChristian Brauner goto out; 4420b8f33e5dSChristian Brauner 4421b8f33e5dSChristian Brauner out: 4422b8f33e5dSChristian Brauner put_device(dev); 4423b8f33e5dSChristian Brauner return error; 4424b8f33e5dSChristian Brauner } 4425b8f33e5dSChristian Brauner EXPORT_SYMBOL_GPL(device_change_owner); 4426b8f33e5dSChristian Brauner 442737b0c020SGreg Kroah-Hartman /** 442837b0c020SGreg Kroah-Hartman * device_shutdown - call ->shutdown() on each device to shutdown. 442937b0c020SGreg Kroah-Hartman */ 443037b0c020SGreg Kroah-Hartman void device_shutdown(void) 443137b0c020SGreg Kroah-Hartman { 4432f123db8eSBenson Leung struct device *dev, *parent; 443337b0c020SGreg Kroah-Hartman 44343297c8fcSPingfan Liu wait_for_device_probe(); 44353297c8fcSPingfan Liu device_block_probing(); 44363297c8fcSPingfan Liu 443765650b35SRafael J. Wysocki cpufreq_suspend(); 443865650b35SRafael J. Wysocki 44396245838fSHugh Daschbach spin_lock(&devices_kset->list_lock); 44406245838fSHugh Daschbach /* 44416245838fSHugh Daschbach * Walk the devices list backward, shutting down each in turn. 44426245838fSHugh Daschbach * Beware that device unplug events may also start pulling 44436245838fSHugh Daschbach * devices offline, even as the system is shutting down. 44446245838fSHugh Daschbach */ 44456245838fSHugh Daschbach while (!list_empty(&devices_kset->list)) { 44466245838fSHugh Daschbach dev = list_entry(devices_kset->list.prev, struct device, 44476245838fSHugh Daschbach kobj.entry); 4448d1c6c030SMing Lei 4449d1c6c030SMing Lei /* 4450d1c6c030SMing Lei * hold reference count of device's parent to 4451d1c6c030SMing Lei * prevent it from being freed because parent's 4452d1c6c030SMing Lei * lock is to be held 4453d1c6c030SMing Lei */ 4454f123db8eSBenson Leung parent = get_device(dev->parent); 44556245838fSHugh Daschbach get_device(dev); 44566245838fSHugh Daschbach /* 44576245838fSHugh Daschbach * Make sure the device is off the kset list, in the 44586245838fSHugh Daschbach * event that dev->*->shutdown() doesn't remove it. 44596245838fSHugh Daschbach */ 44606245838fSHugh Daschbach list_del_init(&dev->kobj.entry); 44616245838fSHugh Daschbach spin_unlock(&devices_kset->list_lock); 4462fe6b91f4SAlan Stern 4463d1c6c030SMing Lei /* hold lock to avoid race with probe/release */ 4464f123db8eSBenson Leung if (parent) 4465f123db8eSBenson Leung device_lock(parent); 4466d1c6c030SMing Lei device_lock(dev); 4467d1c6c030SMing Lei 4468fe6b91f4SAlan Stern /* Don't allow any more runtime suspends */ 4469fe6b91f4SAlan Stern pm_runtime_get_noresume(dev); 4470fe6b91f4SAlan Stern pm_runtime_barrier(dev); 44716245838fSHugh Daschbach 44727521621eSMichal Suchanek if (dev->class && dev->class->shutdown_pre) { 4473f77af151SJosh Zimmerman if (initcall_debug) 44747521621eSMichal Suchanek dev_info(dev, "shutdown_pre\n"); 44757521621eSMichal Suchanek dev->class->shutdown_pre(dev); 44767521621eSMichal Suchanek } 44777521621eSMichal Suchanek if (dev->bus && dev->bus->shutdown) { 44780246c4faSShuoX Liu if (initcall_debug) 44790246c4faSShuoX Liu dev_info(dev, "shutdown\n"); 448037b0c020SGreg Kroah-Hartman dev->bus->shutdown(dev); 448137b0c020SGreg Kroah-Hartman } else if (dev->driver && dev->driver->shutdown) { 44820246c4faSShuoX Liu if (initcall_debug) 44830246c4faSShuoX Liu dev_info(dev, "shutdown\n"); 448437b0c020SGreg Kroah-Hartman dev->driver->shutdown(dev); 448537b0c020SGreg Kroah-Hartman } 4486d1c6c030SMing Lei 4487d1c6c030SMing Lei device_unlock(dev); 4488f123db8eSBenson Leung if (parent) 4489f123db8eSBenson Leung device_unlock(parent); 4490d1c6c030SMing Lei 44916245838fSHugh Daschbach put_device(dev); 4492f123db8eSBenson Leung put_device(parent); 44936245838fSHugh Daschbach 44946245838fSHugh Daschbach spin_lock(&devices_kset->list_lock); 449537b0c020SGreg Kroah-Hartman } 44966245838fSHugh Daschbach spin_unlock(&devices_kset->list_lock); 449737b0c020SGreg Kroah-Hartman } 449899bcf217SJoe Perches 449999bcf217SJoe Perches /* 450099bcf217SJoe Perches * Device logging functions 450199bcf217SJoe Perches */ 450299bcf217SJoe Perches 450399bcf217SJoe Perches #ifdef CONFIG_PRINTK 450474caba7fSJohn Ogness static void 450574caba7fSJohn Ogness set_dev_info(const struct device *dev, struct dev_printk_info *dev_info) 450699bcf217SJoe Perches { 4507c4e00daaSKay Sievers const char *subsys; 450874caba7fSJohn Ogness 450974caba7fSJohn Ogness memset(dev_info, 0, sizeof(*dev_info)); 451099bcf217SJoe Perches 4511c4e00daaSKay Sievers if (dev->class) 4512c4e00daaSKay Sievers subsys = dev->class->name; 4513c4e00daaSKay Sievers else if (dev->bus) 4514c4e00daaSKay Sievers subsys = dev->bus->name; 4515c4e00daaSKay Sievers else 451674caba7fSJohn Ogness return; 4517c4e00daaSKay Sievers 451874caba7fSJohn Ogness strscpy(dev_info->subsystem, subsys, sizeof(dev_info->subsystem)); 4519c4e00daaSKay Sievers 4520c4e00daaSKay Sievers /* 4521c4e00daaSKay Sievers * Add device identifier DEVICE=: 4522c4e00daaSKay Sievers * b12:8 block dev_t 4523c4e00daaSKay Sievers * c127:3 char dev_t 4524c4e00daaSKay Sievers * n8 netdev ifindex 4525c4e00daaSKay Sievers * +sound:card0 subsystem:devname 4526c4e00daaSKay Sievers */ 4527c4e00daaSKay Sievers if (MAJOR(dev->devt)) { 4528c4e00daaSKay Sievers char c; 4529c4e00daaSKay Sievers 4530c4e00daaSKay Sievers if (strcmp(subsys, "block") == 0) 4531c4e00daaSKay Sievers c = 'b'; 4532c4e00daaSKay Sievers else 4533c4e00daaSKay Sievers c = 'c'; 453474caba7fSJohn Ogness 453574caba7fSJohn Ogness snprintf(dev_info->device, sizeof(dev_info->device), 453674caba7fSJohn Ogness "%c%u:%u", c, MAJOR(dev->devt), MINOR(dev->devt)); 4537c4e00daaSKay Sievers } else if (strcmp(subsys, "net") == 0) { 4538c4e00daaSKay Sievers struct net_device *net = to_net_dev(dev); 4539c4e00daaSKay Sievers 454074caba7fSJohn Ogness snprintf(dev_info->device, sizeof(dev_info->device), 454174caba7fSJohn Ogness "n%u", net->ifindex); 4542c4e00daaSKay Sievers } else { 454374caba7fSJohn Ogness snprintf(dev_info->device, sizeof(dev_info->device), 454474caba7fSJohn Ogness "+%s:%s", subsys, dev_name(dev)); 4545c4e00daaSKay Sievers } 454699bcf217SJoe Perches } 4547798efc60SJoe Perches 454805e4e5b8SJoe Perches int dev_vprintk_emit(int level, const struct device *dev, 454905e4e5b8SJoe Perches const char *fmt, va_list args) 455005e4e5b8SJoe Perches { 455174caba7fSJohn Ogness struct dev_printk_info dev_info; 455205e4e5b8SJoe Perches 455374caba7fSJohn Ogness set_dev_info(dev, &dev_info); 455405e4e5b8SJoe Perches 455574caba7fSJohn Ogness return vprintk_emit(0, level, &dev_info, fmt, args); 455605e4e5b8SJoe Perches } 455705e4e5b8SJoe Perches EXPORT_SYMBOL(dev_vprintk_emit); 455805e4e5b8SJoe Perches 455905e4e5b8SJoe Perches int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) 456005e4e5b8SJoe Perches { 456105e4e5b8SJoe Perches va_list args; 456205e4e5b8SJoe Perches int r; 456305e4e5b8SJoe Perches 456405e4e5b8SJoe Perches va_start(args, fmt); 456505e4e5b8SJoe Perches 456605e4e5b8SJoe Perches r = dev_vprintk_emit(level, dev, fmt, args); 456705e4e5b8SJoe Perches 456805e4e5b8SJoe Perches va_end(args); 456905e4e5b8SJoe Perches 457005e4e5b8SJoe Perches return r; 457105e4e5b8SJoe Perches } 457205e4e5b8SJoe Perches EXPORT_SYMBOL(dev_printk_emit); 457305e4e5b8SJoe Perches 4574d1f1052cSJoe Perches static void __dev_printk(const char *level, const struct device *dev, 4575798efc60SJoe Perches struct va_format *vaf) 4576798efc60SJoe Perches { 4577d1f1052cSJoe Perches if (dev) 4578d1f1052cSJoe Perches dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", 4579798efc60SJoe Perches dev_driver_string(dev), dev_name(dev), vaf); 4580d1f1052cSJoe Perches else 4581d1f1052cSJoe Perches printk("%s(NULL device *): %pV", level, vaf); 4582798efc60SJoe Perches } 458399bcf217SJoe Perches 4584d1f1052cSJoe Perches void dev_printk(const char *level, const struct device *dev, 458599bcf217SJoe Perches const char *fmt, ...) 458699bcf217SJoe Perches { 458799bcf217SJoe Perches struct va_format vaf; 458899bcf217SJoe Perches va_list args; 458999bcf217SJoe Perches 459099bcf217SJoe Perches va_start(args, fmt); 459199bcf217SJoe Perches 459299bcf217SJoe Perches vaf.fmt = fmt; 459399bcf217SJoe Perches vaf.va = &args; 459499bcf217SJoe Perches 4595d1f1052cSJoe Perches __dev_printk(level, dev, &vaf); 4596798efc60SJoe Perches 459799bcf217SJoe Perches va_end(args); 459899bcf217SJoe Perches } 459999bcf217SJoe Perches EXPORT_SYMBOL(dev_printk); 460099bcf217SJoe Perches 460199bcf217SJoe Perches #define define_dev_printk_level(func, kern_level) \ 4602d1f1052cSJoe Perches void func(const struct device *dev, const char *fmt, ...) \ 460399bcf217SJoe Perches { \ 460499bcf217SJoe Perches struct va_format vaf; \ 460599bcf217SJoe Perches va_list args; \ 460699bcf217SJoe Perches \ 460799bcf217SJoe Perches va_start(args, fmt); \ 460899bcf217SJoe Perches \ 460999bcf217SJoe Perches vaf.fmt = fmt; \ 461099bcf217SJoe Perches vaf.va = &args; \ 461199bcf217SJoe Perches \ 4612d1f1052cSJoe Perches __dev_printk(kern_level, dev, &vaf); \ 4613798efc60SJoe Perches \ 461499bcf217SJoe Perches va_end(args); \ 461599bcf217SJoe Perches } \ 461699bcf217SJoe Perches EXPORT_SYMBOL(func); 461799bcf217SJoe Perches 4618663336eeSJoe Perches define_dev_printk_level(_dev_emerg, KERN_EMERG); 4619663336eeSJoe Perches define_dev_printk_level(_dev_alert, KERN_ALERT); 4620663336eeSJoe Perches define_dev_printk_level(_dev_crit, KERN_CRIT); 4621663336eeSJoe Perches define_dev_printk_level(_dev_err, KERN_ERR); 4622663336eeSJoe Perches define_dev_printk_level(_dev_warn, KERN_WARNING); 4623663336eeSJoe Perches define_dev_printk_level(_dev_notice, KERN_NOTICE); 462499bcf217SJoe Perches define_dev_printk_level(_dev_info, KERN_INFO); 462599bcf217SJoe Perches 462699bcf217SJoe Perches #endif 462797badf87SRafael J. Wysocki 4628a787e540SAndrzej Hajda /** 4629a787e540SAndrzej Hajda * dev_err_probe - probe error check and log helper 4630a787e540SAndrzej Hajda * @dev: the pointer to the struct device 4631a787e540SAndrzej Hajda * @err: error value to test 4632a787e540SAndrzej Hajda * @fmt: printf-style format string 4633a787e540SAndrzej Hajda * @...: arguments as specified in the format string 4634a787e540SAndrzej Hajda * 4635a787e540SAndrzej Hajda * This helper implements common pattern present in probe functions for error 4636a787e540SAndrzej Hajda * checking: print debug or error message depending if the error value is 4637a787e540SAndrzej Hajda * -EPROBE_DEFER and propagate error upwards. 4638d090b70eSAndrzej Hajda * In case of -EPROBE_DEFER it sets also defer probe reason, which can be 4639d090b70eSAndrzej Hajda * checked later by reading devices_deferred debugfs attribute. 4640074b3aadSMauro Carvalho Chehab * It replaces code sequence:: 4641074b3aadSMauro Carvalho Chehab * 4642a787e540SAndrzej Hajda * if (err != -EPROBE_DEFER) 4643a787e540SAndrzej Hajda * dev_err(dev, ...); 4644a787e540SAndrzej Hajda * else 4645a787e540SAndrzej Hajda * dev_dbg(dev, ...); 4646a787e540SAndrzej Hajda * return err; 4647074b3aadSMauro Carvalho Chehab * 4648074b3aadSMauro Carvalho Chehab * with:: 4649074b3aadSMauro Carvalho Chehab * 4650a787e540SAndrzej Hajda * return dev_err_probe(dev, err, ...); 4651a787e540SAndrzej Hajda * 4652a787e540SAndrzej Hajda * Returns @err. 4653a787e540SAndrzej Hajda * 4654a787e540SAndrzej Hajda */ 4655a787e540SAndrzej Hajda int dev_err_probe(const struct device *dev, int err, const char *fmt, ...) 4656a787e540SAndrzej Hajda { 4657a787e540SAndrzej Hajda struct va_format vaf; 4658a787e540SAndrzej Hajda va_list args; 4659a787e540SAndrzej Hajda 4660a787e540SAndrzej Hajda va_start(args, fmt); 4661a787e540SAndrzej Hajda vaf.fmt = fmt; 4662a787e540SAndrzej Hajda vaf.va = &args; 4663a787e540SAndrzej Hajda 4664d090b70eSAndrzej Hajda if (err != -EPROBE_DEFER) { 4665693a8e93SMichał Mirosław dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf); 4666d090b70eSAndrzej Hajda } else { 4667d090b70eSAndrzej Hajda device_set_deferred_probe_reason(dev, &vaf); 4668693a8e93SMichał Mirosław dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf); 4669d090b70eSAndrzej Hajda } 4670a787e540SAndrzej Hajda 4671a787e540SAndrzej Hajda va_end(args); 4672a787e540SAndrzej Hajda 4673a787e540SAndrzej Hajda return err; 4674a787e540SAndrzej Hajda } 4675a787e540SAndrzej Hajda EXPORT_SYMBOL_GPL(dev_err_probe); 4676a787e540SAndrzej Hajda 467797badf87SRafael J. Wysocki static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) 467897badf87SRafael J. Wysocki { 467997badf87SRafael J. Wysocki return fwnode && !IS_ERR(fwnode->secondary); 468097badf87SRafael J. Wysocki } 468197badf87SRafael J. Wysocki 468297badf87SRafael J. Wysocki /** 468397badf87SRafael J. Wysocki * set_primary_fwnode - Change the primary firmware node of a given device. 468497badf87SRafael J. Wysocki * @dev: Device to handle. 468597badf87SRafael J. Wysocki * @fwnode: New primary firmware node of the device. 468697badf87SRafael J. Wysocki * 468797badf87SRafael J. Wysocki * Set the device's firmware node pointer to @fwnode, but if a secondary 468897badf87SRafael J. Wysocki * firmware node of the device is present, preserve it. 46893f7bddafSBard Liao * 46903f7bddafSBard Liao * Valid fwnode cases are: 46913f7bddafSBard Liao * - primary --> secondary --> -ENODEV 46923f7bddafSBard Liao * - primary --> NULL 46933f7bddafSBard Liao * - secondary --> -ENODEV 46943f7bddafSBard Liao * - NULL 469597badf87SRafael J. Wysocki */ 469697badf87SRafael J. Wysocki void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) 469797badf87SRafael J. Wysocki { 469899aed922SAndy Shevchenko struct device *parent = dev->parent; 469997badf87SRafael J. Wysocki struct fwnode_handle *fn = dev->fwnode; 470097badf87SRafael J. Wysocki 4701c15e1bddSHeikki Krogerus if (fwnode) { 470297badf87SRafael J. Wysocki if (fwnode_is_primary(fn)) 470397badf87SRafael J. Wysocki fn = fn->secondary; 470497badf87SRafael J. Wysocki 470555f89a8aSMika Westerberg if (fn) { 470655f89a8aSMika Westerberg WARN_ON(fwnode->secondary); 470797badf87SRafael J. Wysocki fwnode->secondary = fn; 470855f89a8aSMika Westerberg } 470997badf87SRafael J. Wysocki dev->fwnode = fwnode; 471097badf87SRafael J. Wysocki } else { 4711c15e1bddSHeikki Krogerus if (fwnode_is_primary(fn)) { 4712c15e1bddSHeikki Krogerus dev->fwnode = fn->secondary; 47133f7bddafSBard Liao /* Set fn->secondary = NULL, so fn remains the primary fwnode */ 471499aed922SAndy Shevchenko if (!(parent && fn == parent->fwnode)) 471547f44699SBard Liao fn->secondary = NULL; 4716c15e1bddSHeikki Krogerus } else { 4717c15e1bddSHeikki Krogerus dev->fwnode = NULL; 4718c15e1bddSHeikki Krogerus } 471997badf87SRafael J. Wysocki } 472097badf87SRafael J. Wysocki } 472197badf87SRafael J. Wysocki EXPORT_SYMBOL_GPL(set_primary_fwnode); 472297badf87SRafael J. Wysocki 472397badf87SRafael J. Wysocki /** 472497badf87SRafael J. Wysocki * set_secondary_fwnode - Change the secondary firmware node of a given device. 472597badf87SRafael J. Wysocki * @dev: Device to handle. 472697badf87SRafael J. Wysocki * @fwnode: New secondary firmware node of the device. 472797badf87SRafael J. Wysocki * 472897badf87SRafael J. Wysocki * If a primary firmware node of the device is present, set its secondary 472997badf87SRafael J. Wysocki * pointer to @fwnode. Otherwise, set the device's firmware node pointer to 473097badf87SRafael J. Wysocki * @fwnode. 473197badf87SRafael J. Wysocki */ 473297badf87SRafael J. Wysocki void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) 473397badf87SRafael J. Wysocki { 473497badf87SRafael J. Wysocki if (fwnode) 473597badf87SRafael J. Wysocki fwnode->secondary = ERR_PTR(-ENODEV); 473697badf87SRafael J. Wysocki 473797badf87SRafael J. Wysocki if (fwnode_is_primary(dev->fwnode)) 473897badf87SRafael J. Wysocki dev->fwnode->secondary = fwnode; 473997badf87SRafael J. Wysocki else 474097badf87SRafael J. Wysocki dev->fwnode = fwnode; 474197badf87SRafael J. Wysocki } 474296489ae1SAndy Shevchenko EXPORT_SYMBOL_GPL(set_secondary_fwnode); 47434e75e1d7SJohan Hovold 47444e75e1d7SJohan Hovold /** 47454e75e1d7SJohan Hovold * device_set_of_node_from_dev - reuse device-tree node of another device 47464e75e1d7SJohan Hovold * @dev: device whose device-tree node is being set 47474e75e1d7SJohan Hovold * @dev2: device whose device-tree node is being reused 47484e75e1d7SJohan Hovold * 47494e75e1d7SJohan Hovold * Takes another reference to the new device-tree node after first dropping 47504e75e1d7SJohan Hovold * any reference held to the old node. 47514e75e1d7SJohan Hovold */ 47524e75e1d7SJohan Hovold void device_set_of_node_from_dev(struct device *dev, const struct device *dev2) 47534e75e1d7SJohan Hovold { 47544e75e1d7SJohan Hovold of_node_put(dev->of_node); 47554e75e1d7SJohan Hovold dev->of_node = of_node_get(dev2->of_node); 47564e75e1d7SJohan Hovold dev->of_node_reused = true; 47574e75e1d7SJohan Hovold } 47584e75e1d7SJohan Hovold EXPORT_SYMBOL_GPL(device_set_of_node_from_dev); 475965b66682SSuzuki K Poulose 476043e76d46SIoana Ciornei void device_set_node(struct device *dev, struct fwnode_handle *fwnode) 476143e76d46SIoana Ciornei { 476243e76d46SIoana Ciornei dev->fwnode = fwnode; 476343e76d46SIoana Ciornei dev->of_node = to_of_node(fwnode); 476443e76d46SIoana Ciornei } 476543e76d46SIoana Ciornei EXPORT_SYMBOL_GPL(device_set_node); 476643e76d46SIoana Ciornei 47676cda08a2SSuzuki K Poulose int device_match_name(struct device *dev, const void *name) 47686cda08a2SSuzuki K Poulose { 47696cda08a2SSuzuki K Poulose return sysfs_streq(dev_name(dev), name); 47706cda08a2SSuzuki K Poulose } 47716cda08a2SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_name); 47726cda08a2SSuzuki K Poulose 477365b66682SSuzuki K Poulose int device_match_of_node(struct device *dev, const void *np) 477465b66682SSuzuki K Poulose { 477565b66682SSuzuki K Poulose return dev->of_node == np; 477665b66682SSuzuki K Poulose } 477765b66682SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_of_node); 477867843bbaSSuzuki K Poulose 477967843bbaSSuzuki K Poulose int device_match_fwnode(struct device *dev, const void *fwnode) 478067843bbaSSuzuki K Poulose { 478167843bbaSSuzuki K Poulose return dev_fwnode(dev) == fwnode; 478267843bbaSSuzuki K Poulose } 478367843bbaSSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_fwnode); 47844495dfddSSuzuki K Poulose 47854495dfddSSuzuki K Poulose int device_match_devt(struct device *dev, const void *pdevt) 47864495dfddSSuzuki K Poulose { 47874495dfddSSuzuki K Poulose return dev->devt == *(dev_t *)pdevt; 47884495dfddSSuzuki K Poulose } 47894495dfddSSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_devt); 479000500147SSuzuki K Poulose 479100500147SSuzuki K Poulose int device_match_acpi_dev(struct device *dev, const void *adev) 479200500147SSuzuki K Poulose { 479300500147SSuzuki K Poulose return ACPI_COMPANION(dev) == adev; 479400500147SSuzuki K Poulose } 479500500147SSuzuki K Poulose EXPORT_SYMBOL(device_match_acpi_dev); 47966bf85ba9SSuzuki K Poulose 47976bf85ba9SSuzuki K Poulose int device_match_any(struct device *dev, const void *unused) 47986bf85ba9SSuzuki K Poulose { 47996bf85ba9SSuzuki K Poulose return 1; 48006bf85ba9SSuzuki K Poulose } 48016bf85ba9SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_any); 4802