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> 2963967685SGreg Kroah-Hartman #include <linux/sysfs.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include "base.h" 321da177e4SLinus Torvalds #include "power/power.h" 331da177e4SLinus Torvalds 34e52eec13SAndi Kleen #ifdef CONFIG_SYSFS_DEPRECATED 35e52eec13SAndi Kleen #ifdef CONFIG_SYSFS_DEPRECATED_V2 36e52eec13SAndi Kleen long sysfs_deprecated = 1; 37e52eec13SAndi Kleen #else 38e52eec13SAndi Kleen long sysfs_deprecated = 0; 39e52eec13SAndi Kleen #endif 403454bf96SHanjun Guo static int __init sysfs_deprecated_setup(char *arg) 41e52eec13SAndi Kleen { 4234da5e67SJingoo Han return kstrtol(arg, 10, &sysfs_deprecated); 43e52eec13SAndi Kleen } 44e52eec13SAndi Kleen early_param("sysfs.deprecated", sysfs_deprecated_setup); 45e52eec13SAndi Kleen #endif 46e52eec13SAndi Kleen 479ed98953SRafael J. Wysocki /* Device links support. */ 48e2ae9bccSSaravana Kannan static LIST_HEAD(wait_for_suppliers); 49e2ae9bccSSaravana Kannan static DEFINE_MUTEX(wfs_lock); 50fc5a251dSSaravana Kannan static LIST_HEAD(deferred_sync); 51fc5a251dSSaravana Kannan static unsigned int defer_sync_state_count = 1; 529ed98953SRafael J. Wysocki 539ed98953SRafael J. Wysocki #ifdef CONFIG_SRCU 549ed98953SRafael J. Wysocki static DEFINE_MUTEX(device_links_lock); 559ed98953SRafael J. Wysocki DEFINE_STATIC_SRCU(device_links_srcu); 569ed98953SRafael J. Wysocki 579ed98953SRafael J. Wysocki static inline void device_links_write_lock(void) 589ed98953SRafael J. Wysocki { 599ed98953SRafael J. Wysocki mutex_lock(&device_links_lock); 609ed98953SRafael J. Wysocki } 619ed98953SRafael J. Wysocki 629ed98953SRafael J. Wysocki static inline void device_links_write_unlock(void) 639ed98953SRafael J. Wysocki { 649ed98953SRafael J. Wysocki mutex_unlock(&device_links_lock); 659ed98953SRafael J. Wysocki } 669ed98953SRafael J. Wysocki 679ed98953SRafael J. Wysocki int device_links_read_lock(void) 689ed98953SRafael J. Wysocki { 699ed98953SRafael J. Wysocki return srcu_read_lock(&device_links_srcu); 709ed98953SRafael J. Wysocki } 719ed98953SRafael J. Wysocki 729ed98953SRafael J. Wysocki void device_links_read_unlock(int idx) 739ed98953SRafael J. Wysocki { 749ed98953SRafael J. Wysocki srcu_read_unlock(&device_links_srcu, idx); 759ed98953SRafael J. Wysocki } 76c2fa1e1bSJoel Fernandes (Google) 77c2fa1e1bSJoel Fernandes (Google) int device_links_read_lock_held(void) 78c2fa1e1bSJoel Fernandes (Google) { 79c2fa1e1bSJoel Fernandes (Google) return srcu_read_lock_held(&device_links_srcu); 80c2fa1e1bSJoel Fernandes (Google) } 819ed98953SRafael J. Wysocki #else /* !CONFIG_SRCU */ 829ed98953SRafael J. Wysocki static DECLARE_RWSEM(device_links_lock); 839ed98953SRafael J. Wysocki 849ed98953SRafael J. Wysocki static inline void device_links_write_lock(void) 859ed98953SRafael J. Wysocki { 869ed98953SRafael J. Wysocki down_write(&device_links_lock); 879ed98953SRafael J. Wysocki } 889ed98953SRafael J. Wysocki 899ed98953SRafael J. Wysocki static inline void device_links_write_unlock(void) 909ed98953SRafael J. Wysocki { 919ed98953SRafael J. Wysocki up_write(&device_links_lock); 929ed98953SRafael J. Wysocki } 939ed98953SRafael J. Wysocki 949ed98953SRafael J. Wysocki int device_links_read_lock(void) 959ed98953SRafael J. Wysocki { 969ed98953SRafael J. Wysocki down_read(&device_links_lock); 979ed98953SRafael J. Wysocki return 0; 989ed98953SRafael J. Wysocki } 999ed98953SRafael J. Wysocki 1009ed98953SRafael J. Wysocki void device_links_read_unlock(int not_used) 1019ed98953SRafael J. Wysocki { 1029ed98953SRafael J. Wysocki up_read(&device_links_lock); 1039ed98953SRafael J. Wysocki } 104c2fa1e1bSJoel Fernandes (Google) 105c2fa1e1bSJoel Fernandes (Google) #ifdef CONFIG_DEBUG_LOCK_ALLOC 106c2fa1e1bSJoel Fernandes (Google) int device_links_read_lock_held(void) 107c2fa1e1bSJoel Fernandes (Google) { 108c2fa1e1bSJoel Fernandes (Google) return lockdep_is_held(&device_links_lock); 109c2fa1e1bSJoel Fernandes (Google) } 110c2fa1e1bSJoel Fernandes (Google) #endif 1119ed98953SRafael J. Wysocki #endif /* !CONFIG_SRCU */ 1129ed98953SRafael J. Wysocki 1139ed98953SRafael J. Wysocki /** 1149ed98953SRafael J. Wysocki * device_is_dependent - Check if one device depends on another one 1159ed98953SRafael J. Wysocki * @dev: Device to check dependencies for. 1169ed98953SRafael J. Wysocki * @target: Device to check against. 1179ed98953SRafael J. Wysocki * 1189ed98953SRafael J. Wysocki * Check if @target depends on @dev or any device dependent on it (its child or 1199ed98953SRafael J. Wysocki * its consumer etc). Return 1 if that is the case or 0 otherwise. 1209ed98953SRafael J. Wysocki */ 1219ed98953SRafael J. Wysocki static int device_is_dependent(struct device *dev, void *target) 1229ed98953SRafael J. Wysocki { 1239ed98953SRafael J. Wysocki struct device_link *link; 1249ed98953SRafael J. Wysocki int ret; 1259ed98953SRafael J. Wysocki 126e16f4f3eSBenjamin Gaignard if (dev == target) 1279ed98953SRafael J. Wysocki return 1; 1289ed98953SRafael J. Wysocki 1299ed98953SRafael J. Wysocki ret = device_for_each_child(dev, target, device_is_dependent); 1309ed98953SRafael J. Wysocki if (ret) 1319ed98953SRafael J. Wysocki return ret; 1329ed98953SRafael J. Wysocki 1339ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 13405ef983eSSaravana Kannan if (link->flags == (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) 13505ef983eSSaravana Kannan continue; 13605ef983eSSaravana Kannan 137e16f4f3eSBenjamin Gaignard if (link->consumer == target) 1389ed98953SRafael J. Wysocki return 1; 1399ed98953SRafael J. Wysocki 1409ed98953SRafael J. Wysocki ret = device_is_dependent(link->consumer, target); 1419ed98953SRafael J. Wysocki if (ret) 1429ed98953SRafael J. Wysocki break; 1439ed98953SRafael J. Wysocki } 1449ed98953SRafael J. Wysocki return ret; 1459ed98953SRafael J. Wysocki } 1469ed98953SRafael J. Wysocki 147515db266SRafael J. Wysocki static void device_link_init_status(struct device_link *link, 148515db266SRafael J. Wysocki struct device *consumer, 149515db266SRafael J. Wysocki struct device *supplier) 150515db266SRafael J. Wysocki { 151515db266SRafael J. Wysocki switch (supplier->links.status) { 152515db266SRafael J. Wysocki case DL_DEV_PROBING: 153515db266SRafael J. Wysocki switch (consumer->links.status) { 154515db266SRafael J. Wysocki case DL_DEV_PROBING: 155515db266SRafael J. Wysocki /* 156515db266SRafael J. Wysocki * A consumer driver can create a link to a supplier 157515db266SRafael J. Wysocki * that has not completed its probing yet as long as it 158515db266SRafael J. Wysocki * knows that the supplier is already functional (for 159515db266SRafael J. Wysocki * example, it has just acquired some resources from the 160515db266SRafael J. Wysocki * supplier). 161515db266SRafael J. Wysocki */ 162515db266SRafael J. Wysocki link->status = DL_STATE_CONSUMER_PROBE; 163515db266SRafael J. Wysocki break; 164515db266SRafael J. Wysocki default: 165515db266SRafael J. Wysocki link->status = DL_STATE_DORMANT; 166515db266SRafael J. Wysocki break; 167515db266SRafael J. Wysocki } 168515db266SRafael J. Wysocki break; 169515db266SRafael J. Wysocki case DL_DEV_DRIVER_BOUND: 170515db266SRafael J. Wysocki switch (consumer->links.status) { 171515db266SRafael J. Wysocki case DL_DEV_PROBING: 172515db266SRafael J. Wysocki link->status = DL_STATE_CONSUMER_PROBE; 173515db266SRafael J. Wysocki break; 174515db266SRafael J. Wysocki case DL_DEV_DRIVER_BOUND: 175515db266SRafael J. Wysocki link->status = DL_STATE_ACTIVE; 176515db266SRafael J. Wysocki break; 177515db266SRafael J. Wysocki default: 178515db266SRafael J. Wysocki link->status = DL_STATE_AVAILABLE; 179515db266SRafael J. Wysocki break; 180515db266SRafael J. Wysocki } 181515db266SRafael J. Wysocki break; 182515db266SRafael J. Wysocki case DL_DEV_UNBINDING: 183515db266SRafael J. Wysocki link->status = DL_STATE_SUPPLIER_UNBIND; 184515db266SRafael J. Wysocki break; 185515db266SRafael J. Wysocki default: 186515db266SRafael J. Wysocki link->status = DL_STATE_DORMANT; 187515db266SRafael J. Wysocki break; 188515db266SRafael J. Wysocki } 189515db266SRafael J. Wysocki } 190515db266SRafael J. Wysocki 1919ed98953SRafael J. Wysocki static int device_reorder_to_tail(struct device *dev, void *not_used) 1929ed98953SRafael J. Wysocki { 1939ed98953SRafael J. Wysocki struct device_link *link; 1949ed98953SRafael J. Wysocki 1959ed98953SRafael J. Wysocki /* 1969ed98953SRafael J. Wysocki * Devices that have not been registered yet will be put to the ends 1979ed98953SRafael J. Wysocki * of the lists during the registration, so skip them here. 1989ed98953SRafael J. Wysocki */ 1999ed98953SRafael J. Wysocki if (device_is_registered(dev)) 2009ed98953SRafael J. Wysocki devices_kset_move_last(dev); 2019ed98953SRafael J. Wysocki 2029ed98953SRafael J. Wysocki if (device_pm_initialized(dev)) 2039ed98953SRafael J. Wysocki device_pm_move_last(dev); 2049ed98953SRafael J. Wysocki 2059ed98953SRafael J. Wysocki device_for_each_child(dev, NULL, device_reorder_to_tail); 20605ef983eSSaravana Kannan list_for_each_entry(link, &dev->links.consumers, s_node) { 20705ef983eSSaravana Kannan if (link->flags == (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED)) 20805ef983eSSaravana Kannan continue; 2099ed98953SRafael J. Wysocki device_reorder_to_tail(link->consumer, NULL); 21005ef983eSSaravana Kannan } 2119ed98953SRafael J. Wysocki 2129ed98953SRafael J. Wysocki return 0; 2139ed98953SRafael J. Wysocki } 2149ed98953SRafael J. Wysocki 2159ed98953SRafael J. Wysocki /** 216494fd7b7SFeng Kan * device_pm_move_to_tail - Move set of devices to the end of device lists 217494fd7b7SFeng Kan * @dev: Device to move 218494fd7b7SFeng Kan * 219494fd7b7SFeng Kan * This is a device_reorder_to_tail() wrapper taking the requisite locks. 220494fd7b7SFeng Kan * 221494fd7b7SFeng Kan * It moves the @dev along with all of its children and all of its consumers 222494fd7b7SFeng Kan * to the ends of the device_kset and dpm_list, recursively. 223494fd7b7SFeng Kan */ 224494fd7b7SFeng Kan void device_pm_move_to_tail(struct device *dev) 225494fd7b7SFeng Kan { 226494fd7b7SFeng Kan int idx; 227494fd7b7SFeng Kan 228494fd7b7SFeng Kan idx = device_links_read_lock(); 229494fd7b7SFeng Kan device_pm_lock(); 230494fd7b7SFeng Kan device_reorder_to_tail(dev, NULL); 231494fd7b7SFeng Kan device_pm_unlock(); 232494fd7b7SFeng Kan device_links_read_unlock(idx); 233494fd7b7SFeng Kan } 234494fd7b7SFeng Kan 235515db266SRafael J. Wysocki #define DL_MANAGED_LINK_FLAGS (DL_FLAG_AUTOREMOVE_CONSUMER | \ 236515db266SRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER | \ 23705ef983eSSaravana Kannan DL_FLAG_AUTOPROBE_CONSUMER | \ 23805ef983eSSaravana Kannan DL_FLAG_SYNC_STATE_ONLY) 239515db266SRafael J. Wysocki 240fb583c8eSRafael J. Wysocki #define DL_ADD_VALID_FLAGS (DL_MANAGED_LINK_FLAGS | DL_FLAG_STATELESS | \ 241fb583c8eSRafael J. Wysocki DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE) 242fb583c8eSRafael J. Wysocki 243494fd7b7SFeng Kan /** 2449ed98953SRafael J. Wysocki * device_link_add - Create a link between two devices. 2459ed98953SRafael J. Wysocki * @consumer: Consumer end of the link. 2469ed98953SRafael J. Wysocki * @supplier: Supplier end of the link. 2479ed98953SRafael J. Wysocki * @flags: Link flags. 2489ed98953SRafael J. Wysocki * 24921d5c57bSRafael J. Wysocki * The caller is responsible for the proper synchronization of the link creation 25021d5c57bSRafael J. Wysocki * with runtime PM. First, setting the DL_FLAG_PM_RUNTIME flag will cause the 25121d5c57bSRafael J. Wysocki * runtime PM framework to take the link into account. Second, if the 25221d5c57bSRafael J. Wysocki * DL_FLAG_RPM_ACTIVE flag is set in addition to it, the supplier devices will 25321d5c57bSRafael J. Wysocki * be forced into the active metastate and reference-counted upon the creation 25421d5c57bSRafael J. Wysocki * of the link. If DL_FLAG_PM_RUNTIME is not set, DL_FLAG_RPM_ACTIVE will be 25521d5c57bSRafael J. Wysocki * ignored. 25621d5c57bSRafael J. Wysocki * 257515db266SRafael J. Wysocki * If DL_FLAG_STATELESS is set in @flags, the caller of this function is 258515db266SRafael J. Wysocki * expected to release the link returned by it directly with the help of either 259515db266SRafael J. Wysocki * device_link_del() or device_link_remove(). 26072175d4eSRafael J. Wysocki * 26172175d4eSRafael J. Wysocki * If that flag is not set, however, the caller of this function is handing the 26272175d4eSRafael J. Wysocki * management of the link over to the driver core entirely and its return value 26372175d4eSRafael J. Wysocki * can only be used to check whether or not the link is present. In that case, 26472175d4eSRafael J. Wysocki * the DL_FLAG_AUTOREMOVE_CONSUMER and DL_FLAG_AUTOREMOVE_SUPPLIER device link 26572175d4eSRafael J. Wysocki * flags can be used to indicate to the driver core when the link can be safely 26672175d4eSRafael J. Wysocki * deleted. Namely, setting one of them in @flags indicates to the driver core 26772175d4eSRafael J. Wysocki * that the link is not going to be used (by the given caller of this function) 26872175d4eSRafael J. Wysocki * after unbinding the consumer or supplier driver, respectively, from its 26972175d4eSRafael J. Wysocki * device, so the link can be deleted at that point. If none of them is set, 27072175d4eSRafael J. Wysocki * the link will be maintained until one of the devices pointed to by it (either 27172175d4eSRafael J. Wysocki * the consumer or the supplier) is unregistered. 272c8d50986SRafael J. Wysocki * 273e7dd4010SRafael J. Wysocki * Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and 274e7dd4010SRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent 275e7dd4010SRafael J. Wysocki * managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can 276e7dd4010SRafael J. Wysocki * be used to request the driver core to automaticall probe for a consmer 277e7dd4010SRafael J. Wysocki * driver after successfully binding a driver to the supplier device. 278e7dd4010SRafael J. Wysocki * 279515db266SRafael J. Wysocki * The combination of DL_FLAG_STATELESS and one of DL_FLAG_AUTOREMOVE_CONSUMER, 280515db266SRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER, or DL_FLAG_AUTOPROBE_CONSUMER set in @flags at 281515db266SRafael J. Wysocki * the same time is invalid and will cause NULL to be returned upfront. 282515db266SRafael J. Wysocki * However, if a device link between the given @consumer and @supplier pair 283515db266SRafael J. Wysocki * exists already when this function is called for them, the existing link will 284515db266SRafael J. Wysocki * be returned regardless of its current type and status (the link's flags may 285515db266SRafael J. Wysocki * be modified then). The caller of this function is then expected to treat 286515db266SRafael J. Wysocki * the link as though it has just been created, so (in particular) if 287515db266SRafael J. Wysocki * DL_FLAG_STATELESS was passed in @flags, the link needs to be released 288515db266SRafael J. Wysocki * explicitly when not needed any more (as stated above). 2899ed98953SRafael J. Wysocki * 2909ed98953SRafael J. Wysocki * A side effect of the link creation is re-ordering of dpm_list and the 2919ed98953SRafael J. Wysocki * devices_kset list by moving the consumer device and all devices depending 2929ed98953SRafael J. Wysocki * on it to the ends of these lists (that does not happen to devices that have 2939ed98953SRafael J. Wysocki * not been registered when this function is called). 2949ed98953SRafael J. Wysocki * 2959ed98953SRafael J. Wysocki * The supplier device is required to be registered when this function is called 2969ed98953SRafael J. Wysocki * and NULL will be returned if that is not the case. The consumer device need 29764df1148SLukas Wunner * not be registered, however. 2989ed98953SRafael J. Wysocki */ 2999ed98953SRafael J. Wysocki struct device_link *device_link_add(struct device *consumer, 3009ed98953SRafael J. Wysocki struct device *supplier, u32 flags) 3019ed98953SRafael J. Wysocki { 3029ed98953SRafael J. Wysocki struct device_link *link; 3039ed98953SRafael J. Wysocki 304fb583c8eSRafael J. Wysocki if (!consumer || !supplier || flags & ~DL_ADD_VALID_FLAGS || 305515db266SRafael J. Wysocki (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) || 30605ef983eSSaravana Kannan (flags & DL_FLAG_SYNC_STATE_ONLY && 30705ef983eSSaravana Kannan flags != DL_FLAG_SYNC_STATE_ONLY) || 308e7dd4010SRafael J. Wysocki (flags & DL_FLAG_AUTOPROBE_CONSUMER && 309e7dd4010SRafael J. Wysocki flags & (DL_FLAG_AUTOREMOVE_CONSUMER | 310e7dd4010SRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER))) 3119ed98953SRafael J. Wysocki return NULL; 3129ed98953SRafael J. Wysocki 3135db25c9eSRafael J. Wysocki if (flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) { 3145db25c9eSRafael J. Wysocki if (pm_runtime_get_sync(supplier) < 0) { 3155db25c9eSRafael J. Wysocki pm_runtime_put_noidle(supplier); 3165db25c9eSRafael J. Wysocki return NULL; 3175db25c9eSRafael J. Wysocki } 3185db25c9eSRafael J. Wysocki } 3195db25c9eSRafael J. Wysocki 320515db266SRafael J. Wysocki if (!(flags & DL_FLAG_STATELESS)) 321515db266SRafael J. Wysocki flags |= DL_FLAG_MANAGED; 322515db266SRafael J. Wysocki 3239ed98953SRafael J. Wysocki device_links_write_lock(); 3249ed98953SRafael J. Wysocki device_pm_lock(); 3259ed98953SRafael J. Wysocki 3269ed98953SRafael J. Wysocki /* 3279ed98953SRafael J. Wysocki * If the supplier has not been fully registered yet or there is a 32805ef983eSSaravana Kannan * reverse (non-SYNC_STATE_ONLY) dependency between the consumer and 32905ef983eSSaravana Kannan * the supplier already in the graph, return NULL. If the link is a 33005ef983eSSaravana Kannan * SYNC_STATE_ONLY link, we don't check for reverse dependencies 33105ef983eSSaravana Kannan * because it only affects sync_state() callbacks. 3329ed98953SRafael J. Wysocki */ 3339ed98953SRafael J. Wysocki if (!device_pm_initialized(supplier) 33405ef983eSSaravana Kannan || (!(flags & DL_FLAG_SYNC_STATE_ONLY) && 33505ef983eSSaravana Kannan device_is_dependent(consumer, supplier))) { 3369ed98953SRafael J. Wysocki link = NULL; 3379ed98953SRafael J. Wysocki goto out; 3389ed98953SRafael J. Wysocki } 3399ed98953SRafael J. Wysocki 34072175d4eSRafael J. Wysocki /* 34172175d4eSRafael J. Wysocki * DL_FLAG_AUTOREMOVE_SUPPLIER indicates that the link will be needed 34272175d4eSRafael J. Wysocki * longer than for DL_FLAG_AUTOREMOVE_CONSUMER and setting them both 34372175d4eSRafael J. Wysocki * together doesn't make sense, so prefer DL_FLAG_AUTOREMOVE_SUPPLIER. 34472175d4eSRafael J. Wysocki */ 34572175d4eSRafael J. Wysocki if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) 34672175d4eSRafael J. Wysocki flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; 34772175d4eSRafael J. Wysocki 348f265df55SRafael J. Wysocki list_for_each_entry(link, &supplier->links.consumers, s_node) { 349f265df55SRafael J. Wysocki if (link->consumer != consumer) 350f265df55SRafael J. Wysocki continue; 351f265df55SRafael J. Wysocki 352e2f3cd83SRafael J. Wysocki if (flags & DL_FLAG_PM_RUNTIME) { 353e2f3cd83SRafael J. Wysocki if (!(link->flags & DL_FLAG_PM_RUNTIME)) { 3544c06c4e6SRafael J. Wysocki pm_runtime_new_link(consumer); 355e2f3cd83SRafael J. Wysocki link->flags |= DL_FLAG_PM_RUNTIME; 356e2f3cd83SRafael J. Wysocki } 357e2f3cd83SRafael J. Wysocki if (flags & DL_FLAG_RPM_ACTIVE) 35836003d4cSRafael J. Wysocki refcount_inc(&link->rpm_active); 359e2f3cd83SRafael J. Wysocki } 360e2f3cd83SRafael J. Wysocki 36172175d4eSRafael J. Wysocki if (flags & DL_FLAG_STATELESS) { 362ead18c23SLukas Wunner kref_get(&link->kref); 36305ef983eSSaravana Kannan if (link->flags & DL_FLAG_SYNC_STATE_ONLY && 36405ef983eSSaravana Kannan !(link->flags & DL_FLAG_STATELESS)) { 36505ef983eSSaravana Kannan link->flags |= DL_FLAG_STATELESS; 36605ef983eSSaravana Kannan goto reorder; 36705ef983eSSaravana Kannan } else { 3689ed98953SRafael J. Wysocki goto out; 369ead18c23SLukas Wunner } 37005ef983eSSaravana Kannan } 3719ed98953SRafael J. Wysocki 37272175d4eSRafael J. Wysocki /* 37372175d4eSRafael J. Wysocki * If the life time of the link following from the new flags is 37472175d4eSRafael J. Wysocki * longer than indicated by the flags of the existing link, 37572175d4eSRafael J. Wysocki * update the existing link to stay around longer. 37672175d4eSRafael J. Wysocki */ 37772175d4eSRafael J. Wysocki if (flags & DL_FLAG_AUTOREMOVE_SUPPLIER) { 37872175d4eSRafael J. Wysocki if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) { 37972175d4eSRafael J. Wysocki link->flags &= ~DL_FLAG_AUTOREMOVE_CONSUMER; 38072175d4eSRafael J. Wysocki link->flags |= DL_FLAG_AUTOREMOVE_SUPPLIER; 38172175d4eSRafael J. Wysocki } 38272175d4eSRafael J. Wysocki } else if (!(flags & DL_FLAG_AUTOREMOVE_CONSUMER)) { 38372175d4eSRafael J. Wysocki link->flags &= ~(DL_FLAG_AUTOREMOVE_CONSUMER | 38472175d4eSRafael J. Wysocki DL_FLAG_AUTOREMOVE_SUPPLIER); 38572175d4eSRafael J. Wysocki } 386515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) { 387515db266SRafael J. Wysocki kref_get(&link->kref); 388515db266SRafael J. Wysocki link->flags |= DL_FLAG_MANAGED; 389515db266SRafael J. Wysocki device_link_init_status(link, consumer, supplier); 390515db266SRafael J. Wysocki } 39105ef983eSSaravana Kannan if (link->flags & DL_FLAG_SYNC_STATE_ONLY && 39205ef983eSSaravana Kannan !(flags & DL_FLAG_SYNC_STATE_ONLY)) { 39305ef983eSSaravana Kannan link->flags &= ~DL_FLAG_SYNC_STATE_ONLY; 39405ef983eSSaravana Kannan goto reorder; 39505ef983eSSaravana Kannan } 39605ef983eSSaravana Kannan 39772175d4eSRafael J. Wysocki goto out; 39872175d4eSRafael J. Wysocki } 39972175d4eSRafael J. Wysocki 40021d5c57bSRafael J. Wysocki link = kzalloc(sizeof(*link), GFP_KERNEL); 4019ed98953SRafael J. Wysocki if (!link) 4029ed98953SRafael J. Wysocki goto out; 4039ed98953SRafael J. Wysocki 404e2f3cd83SRafael J. Wysocki refcount_set(&link->rpm_active, 1); 405e2f3cd83SRafael J. Wysocki 406baa8809fSRafael J. Wysocki if (flags & DL_FLAG_PM_RUNTIME) { 407e2f3cd83SRafael J. Wysocki if (flags & DL_FLAG_RPM_ACTIVE) 40836003d4cSRafael J. Wysocki refcount_inc(&link->rpm_active); 409e2f3cd83SRafael J. Wysocki 4104c06c4e6SRafael J. Wysocki pm_runtime_new_link(consumer); 41121d5c57bSRafael J. Wysocki } 412e2f3cd83SRafael J. Wysocki 4139ed98953SRafael J. Wysocki get_device(supplier); 4149ed98953SRafael J. Wysocki link->supplier = supplier; 4159ed98953SRafael J. Wysocki INIT_LIST_HEAD(&link->s_node); 4169ed98953SRafael J. Wysocki get_device(consumer); 4179ed98953SRafael J. Wysocki link->consumer = consumer; 4189ed98953SRafael J. Wysocki INIT_LIST_HEAD(&link->c_node); 4199ed98953SRafael J. Wysocki link->flags = flags; 420ead18c23SLukas Wunner kref_init(&link->kref); 4219ed98953SRafael J. Wysocki 42264df1148SLukas Wunner /* Determine the initial link state. */ 423515db266SRafael J. Wysocki if (flags & DL_FLAG_STATELESS) 4249ed98953SRafael J. Wysocki link->status = DL_STATE_NONE; 425515db266SRafael J. Wysocki else 426515db266SRafael J. Wysocki device_link_init_status(link, consumer, supplier); 4279ed98953SRafael J. Wysocki 4289ed98953SRafael J. Wysocki /* 42915cfb094SRafael J. Wysocki * Some callers expect the link creation during consumer driver probe to 43015cfb094SRafael J. Wysocki * resume the supplier even without DL_FLAG_RPM_ACTIVE. 43115cfb094SRafael J. Wysocki */ 43215cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE && 43315cfb094SRafael J. Wysocki flags & DL_FLAG_PM_RUNTIME) 43415cfb094SRafael J. Wysocki pm_runtime_resume(supplier); 43515cfb094SRafael J. Wysocki 43605ef983eSSaravana Kannan if (flags & DL_FLAG_SYNC_STATE_ONLY) { 43705ef983eSSaravana Kannan dev_dbg(consumer, 43805ef983eSSaravana Kannan "Linked as a sync state only consumer to %s\n", 43905ef983eSSaravana Kannan dev_name(supplier)); 44005ef983eSSaravana Kannan goto out; 44105ef983eSSaravana Kannan } 44205ef983eSSaravana Kannan reorder: 44315cfb094SRafael J. Wysocki /* 4449ed98953SRafael J. Wysocki * Move the consumer and all of the devices depending on it to the end 4459ed98953SRafael J. Wysocki * of dpm_list and the devices_kset list. 4469ed98953SRafael J. Wysocki * 4479ed98953SRafael J. Wysocki * It is necessary to hold dpm_list locked throughout all that or else 4489ed98953SRafael J. Wysocki * we may end up suspending with a wrong ordering of it. 4499ed98953SRafael J. Wysocki */ 4509ed98953SRafael J. Wysocki device_reorder_to_tail(consumer, NULL); 4519ed98953SRafael J. Wysocki 4529ed98953SRafael J. Wysocki list_add_tail_rcu(&link->s_node, &supplier->links.consumers); 4539ed98953SRafael J. Wysocki list_add_tail_rcu(&link->c_node, &consumer->links.suppliers); 4549ed98953SRafael J. Wysocki 4558a4b3269SJerome Brunet dev_dbg(consumer, "Linked as a consumer to %s\n", dev_name(supplier)); 4569ed98953SRafael J. Wysocki 4579ed98953SRafael J. Wysocki out: 4589ed98953SRafael J. Wysocki device_pm_unlock(); 4599ed98953SRafael J. Wysocki device_links_write_unlock(); 4605db25c9eSRafael J. Wysocki 461e2f3cd83SRafael J. Wysocki if ((flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) && !link) 4625db25c9eSRafael J. Wysocki pm_runtime_put(supplier); 4635db25c9eSRafael J. Wysocki 4649ed98953SRafael J. Wysocki return link; 4659ed98953SRafael J. Wysocki } 4669ed98953SRafael J. Wysocki EXPORT_SYMBOL_GPL(device_link_add); 4679ed98953SRafael J. Wysocki 468e2ae9bccSSaravana Kannan /** 469e2ae9bccSSaravana Kannan * device_link_wait_for_supplier - Add device to wait_for_suppliers list 470e2ae9bccSSaravana Kannan * @consumer: Consumer device 471e2ae9bccSSaravana Kannan * 472e2ae9bccSSaravana Kannan * Marks the @consumer device as waiting for suppliers to become available by 473e2ae9bccSSaravana Kannan * adding it to the wait_for_suppliers list. The consumer device will never be 474e2ae9bccSSaravana Kannan * probed until it's removed from the wait_for_suppliers list. 475e2ae9bccSSaravana Kannan * 476e2ae9bccSSaravana Kannan * The caller is responsible for adding the links to the supplier devices once 477e2ae9bccSSaravana Kannan * they are available and removing the @consumer device from the 478e2ae9bccSSaravana Kannan * wait_for_suppliers list once links to all the suppliers have been created. 479e2ae9bccSSaravana Kannan * 480e2ae9bccSSaravana Kannan * This function is NOT meant to be called from the probe function of the 481e2ae9bccSSaravana Kannan * consumer but rather from code that creates/adds the consumer device. 482e2ae9bccSSaravana Kannan */ 483bcbbcfd5SSaravana Kannan static void device_link_wait_for_supplier(struct device *consumer, 484bcbbcfd5SSaravana Kannan bool need_for_probe) 485e2ae9bccSSaravana Kannan { 486e2ae9bccSSaravana Kannan mutex_lock(&wfs_lock); 487e2ae9bccSSaravana Kannan list_add_tail(&consumer->links.needs_suppliers, &wait_for_suppliers); 488bcbbcfd5SSaravana Kannan consumer->links.need_for_probe = need_for_probe; 489e2ae9bccSSaravana Kannan mutex_unlock(&wfs_lock); 490e2ae9bccSSaravana Kannan } 491e2ae9bccSSaravana Kannan 492bcbbcfd5SSaravana Kannan static void device_link_wait_for_mandatory_supplier(struct device *consumer) 493bcbbcfd5SSaravana Kannan { 494bcbbcfd5SSaravana Kannan device_link_wait_for_supplier(consumer, true); 495bcbbcfd5SSaravana Kannan } 496bcbbcfd5SSaravana Kannan 497bcbbcfd5SSaravana Kannan static void device_link_wait_for_optional_supplier(struct device *consumer) 498bcbbcfd5SSaravana Kannan { 499bcbbcfd5SSaravana Kannan device_link_wait_for_supplier(consumer, false); 500bcbbcfd5SSaravana Kannan } 501bcbbcfd5SSaravana Kannan 502e2ae9bccSSaravana Kannan /** 503e2ae9bccSSaravana Kannan * device_link_add_missing_supplier_links - Add links from consumer devices to 504e2ae9bccSSaravana Kannan * supplier devices, leaving any 505e2ae9bccSSaravana Kannan * consumer with inactive suppliers on 506e2ae9bccSSaravana Kannan * the wait_for_suppliers list 507e2ae9bccSSaravana Kannan * 508e2ae9bccSSaravana Kannan * Loops through all consumers waiting on suppliers and tries to add all their 509e2ae9bccSSaravana Kannan * supplier links. If that succeeds, the consumer device is removed from 510e2ae9bccSSaravana Kannan * wait_for_suppliers list. Otherwise, they are left in the wait_for_suppliers 511e2ae9bccSSaravana Kannan * list. Devices left on the wait_for_suppliers list will not be probed. 512e2ae9bccSSaravana Kannan * 513e2ae9bccSSaravana Kannan * The fwnode add_links callback is expected to return 0 if it has found and 514e2ae9bccSSaravana Kannan * added all the supplier links for the consumer device. It should return an 515e2ae9bccSSaravana Kannan * error if it isn't able to do so. 516e2ae9bccSSaravana Kannan * 517e2ae9bccSSaravana Kannan * The caller of device_link_wait_for_supplier() is expected to call this once 518e2ae9bccSSaravana Kannan * it's aware of potential suppliers becoming available. 519e2ae9bccSSaravana Kannan */ 520e2ae9bccSSaravana Kannan static void device_link_add_missing_supplier_links(void) 521e2ae9bccSSaravana Kannan { 522e2ae9bccSSaravana Kannan struct device *dev, *tmp; 523e2ae9bccSSaravana Kannan 524e2ae9bccSSaravana Kannan mutex_lock(&wfs_lock); 525e2ae9bccSSaravana Kannan list_for_each_entry_safe(dev, tmp, &wait_for_suppliers, 526e2ae9bccSSaravana Kannan links.needs_suppliers) 527e2ae9bccSSaravana Kannan if (!fwnode_call_int_op(dev->fwnode, add_links, dev)) 528e2ae9bccSSaravana Kannan list_del_init(&dev->links.needs_suppliers); 529e2ae9bccSSaravana Kannan mutex_unlock(&wfs_lock); 530e2ae9bccSSaravana Kannan } 531e2ae9bccSSaravana Kannan 5329ed98953SRafael J. Wysocki static void device_link_free(struct device_link *link) 5339ed98953SRafael J. Wysocki { 534a1fdbfbbSRafael J. Wysocki while (refcount_dec_not_one(&link->rpm_active)) 535a1fdbfbbSRafael J. Wysocki pm_runtime_put(link->supplier); 536a1fdbfbbSRafael J. Wysocki 5379ed98953SRafael J. Wysocki put_device(link->consumer); 5389ed98953SRafael J. Wysocki put_device(link->supplier); 5399ed98953SRafael J. Wysocki kfree(link); 5409ed98953SRafael J. Wysocki } 5419ed98953SRafael J. Wysocki 5429ed98953SRafael J. Wysocki #ifdef CONFIG_SRCU 5439ed98953SRafael J. Wysocki static void __device_link_free_srcu(struct rcu_head *rhead) 5449ed98953SRafael J. Wysocki { 5459ed98953SRafael J. Wysocki device_link_free(container_of(rhead, struct device_link, rcu_head)); 5469ed98953SRafael J. Wysocki } 5479ed98953SRafael J. Wysocki 548ead18c23SLukas Wunner static void __device_link_del(struct kref *kref) 5499ed98953SRafael J. Wysocki { 550ead18c23SLukas Wunner struct device_link *link = container_of(kref, struct device_link, kref); 551ead18c23SLukas Wunner 5528a4b3269SJerome Brunet dev_dbg(link->consumer, "Dropping the link to %s\n", 5539ed98953SRafael J. Wysocki dev_name(link->supplier)); 5549ed98953SRafael J. Wysocki 555baa8809fSRafael J. Wysocki if (link->flags & DL_FLAG_PM_RUNTIME) 556baa8809fSRafael J. Wysocki pm_runtime_drop_link(link->consumer); 557baa8809fSRafael J. Wysocki 5589ed98953SRafael J. Wysocki list_del_rcu(&link->s_node); 5599ed98953SRafael J. Wysocki list_del_rcu(&link->c_node); 5609ed98953SRafael J. Wysocki call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu); 5619ed98953SRafael J. Wysocki } 5629ed98953SRafael J. Wysocki #else /* !CONFIG_SRCU */ 563ead18c23SLukas Wunner static void __device_link_del(struct kref *kref) 5649ed98953SRafael J. Wysocki { 565ead18c23SLukas Wunner struct device_link *link = container_of(kref, struct device_link, kref); 566ead18c23SLukas Wunner 5679ed98953SRafael J. Wysocki dev_info(link->consumer, "Dropping the link to %s\n", 5689ed98953SRafael J. Wysocki dev_name(link->supplier)); 5699ed98953SRafael J. Wysocki 570433986c2SLukas Wunner if (link->flags & DL_FLAG_PM_RUNTIME) 571433986c2SLukas Wunner pm_runtime_drop_link(link->consumer); 572433986c2SLukas Wunner 5739ed98953SRafael J. Wysocki list_del(&link->s_node); 5749ed98953SRafael J. Wysocki list_del(&link->c_node); 5759ed98953SRafael J. Wysocki device_link_free(link); 5769ed98953SRafael J. Wysocki } 5779ed98953SRafael J. Wysocki #endif /* !CONFIG_SRCU */ 5789ed98953SRafael J. Wysocki 57972175d4eSRafael J. Wysocki static void device_link_put_kref(struct device_link *link) 58072175d4eSRafael J. Wysocki { 58172175d4eSRafael J. Wysocki if (link->flags & DL_FLAG_STATELESS) 58272175d4eSRafael J. Wysocki kref_put(&link->kref, __device_link_del); 58372175d4eSRafael J. Wysocki else 58472175d4eSRafael J. Wysocki WARN(1, "Unable to drop a managed device link reference\n"); 58572175d4eSRafael J. Wysocki } 58672175d4eSRafael J. Wysocki 5879ed98953SRafael J. Wysocki /** 58872175d4eSRafael J. Wysocki * device_link_del - Delete a stateless link between two devices. 5899ed98953SRafael J. Wysocki * @link: Device link to delete. 5909ed98953SRafael J. Wysocki * 5919ed98953SRafael J. Wysocki * The caller must ensure proper synchronization of this function with runtime 592ead18c23SLukas Wunner * PM. If the link was added multiple times, it needs to be deleted as often. 593ead18c23SLukas Wunner * Care is required for hotplugged devices: Their links are purged on removal 594ead18c23SLukas Wunner * and calling device_link_del() is then no longer allowed. 5959ed98953SRafael J. Wysocki */ 5969ed98953SRafael J. Wysocki void device_link_del(struct device_link *link) 5979ed98953SRafael J. Wysocki { 5989ed98953SRafael J. Wysocki device_links_write_lock(); 5999ed98953SRafael J. Wysocki device_pm_lock(); 60072175d4eSRafael J. Wysocki device_link_put_kref(link); 6019ed98953SRafael J. Wysocki device_pm_unlock(); 6029ed98953SRafael J. Wysocki device_links_write_unlock(); 6039ed98953SRafael J. Wysocki } 6049ed98953SRafael J. Wysocki EXPORT_SYMBOL_GPL(device_link_del); 6059ed98953SRafael J. Wysocki 606d8842211Spascal paillet /** 60772175d4eSRafael J. Wysocki * device_link_remove - Delete a stateless link between two devices. 608d8842211Spascal paillet * @consumer: Consumer end of the link. 609d8842211Spascal paillet * @supplier: Supplier end of the link. 610d8842211Spascal paillet * 611d8842211Spascal paillet * The caller must ensure proper synchronization of this function with runtime 612d8842211Spascal paillet * PM. 613d8842211Spascal paillet */ 614d8842211Spascal paillet void device_link_remove(void *consumer, struct device *supplier) 615d8842211Spascal paillet { 616d8842211Spascal paillet struct device_link *link; 617d8842211Spascal paillet 618d8842211Spascal paillet if (WARN_ON(consumer == supplier)) 619d8842211Spascal paillet return; 620d8842211Spascal paillet 621d8842211Spascal paillet device_links_write_lock(); 622d8842211Spascal paillet device_pm_lock(); 623d8842211Spascal paillet 624d8842211Spascal paillet list_for_each_entry(link, &supplier->links.consumers, s_node) { 625d8842211Spascal paillet if (link->consumer == consumer) { 62672175d4eSRafael J. Wysocki device_link_put_kref(link); 627d8842211Spascal paillet break; 628d8842211Spascal paillet } 629d8842211Spascal paillet } 630d8842211Spascal paillet 631d8842211Spascal paillet device_pm_unlock(); 632d8842211Spascal paillet device_links_write_unlock(); 633d8842211Spascal paillet } 634d8842211Spascal paillet EXPORT_SYMBOL_GPL(device_link_remove); 635d8842211Spascal paillet 6369ed98953SRafael J. Wysocki static void device_links_missing_supplier(struct device *dev) 6379ed98953SRafael J. Wysocki { 6389ed98953SRafael J. Wysocki struct device_link *link; 6399ed98953SRafael J. Wysocki 6409ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.suppliers, c_node) 6419ed98953SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE) 6429ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 6439ed98953SRafael J. Wysocki } 6449ed98953SRafael J. Wysocki 6459ed98953SRafael J. Wysocki /** 6469ed98953SRafael J. Wysocki * device_links_check_suppliers - Check presence of supplier drivers. 6479ed98953SRafael J. Wysocki * @dev: Consumer device. 6489ed98953SRafael J. Wysocki * 6499ed98953SRafael J. Wysocki * Check links from this device to any suppliers. Walk the list of the device's 6509ed98953SRafael J. Wysocki * links to suppliers and see if all of them are available. If not, simply 6519ed98953SRafael J. Wysocki * return -EPROBE_DEFER. 6529ed98953SRafael J. Wysocki * 6539ed98953SRafael J. Wysocki * We need to guarantee that the supplier will not go away after the check has 6549ed98953SRafael J. Wysocki * been positive here. It only can go away in __device_release_driver() and 6559ed98953SRafael J. Wysocki * that function checks the device's links to consumers. This means we need to 6569ed98953SRafael J. Wysocki * mark the link as "consumer probe in progress" to make the supplier removal 6579ed98953SRafael J. Wysocki * wait for us to complete (or bad things may happen). 6589ed98953SRafael J. Wysocki * 659515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 6609ed98953SRafael J. Wysocki */ 6619ed98953SRafael J. Wysocki int device_links_check_suppliers(struct device *dev) 6629ed98953SRafael J. Wysocki { 6639ed98953SRafael J. Wysocki struct device_link *link; 6649ed98953SRafael J. Wysocki int ret = 0; 6659ed98953SRafael J. Wysocki 666e2ae9bccSSaravana Kannan /* 667e2ae9bccSSaravana Kannan * Device waiting for supplier to become available is not allowed to 668e2ae9bccSSaravana Kannan * probe. 669e2ae9bccSSaravana Kannan */ 670e2ae9bccSSaravana Kannan mutex_lock(&wfs_lock); 671bcbbcfd5SSaravana Kannan if (!list_empty(&dev->links.needs_suppliers) && 672bcbbcfd5SSaravana Kannan dev->links.need_for_probe) { 673e2ae9bccSSaravana Kannan mutex_unlock(&wfs_lock); 674e2ae9bccSSaravana Kannan return -EPROBE_DEFER; 675e2ae9bccSSaravana Kannan } 676e2ae9bccSSaravana Kannan mutex_unlock(&wfs_lock); 677e2ae9bccSSaravana Kannan 6789ed98953SRafael J. Wysocki device_links_write_lock(); 6799ed98953SRafael J. Wysocki 6809ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.suppliers, c_node) { 68105ef983eSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED) || 68205ef983eSSaravana Kannan link->flags & DL_FLAG_SYNC_STATE_ONLY) 6839ed98953SRafael J. Wysocki continue; 6849ed98953SRafael J. Wysocki 6859ed98953SRafael J. Wysocki if (link->status != DL_STATE_AVAILABLE) { 6869ed98953SRafael J. Wysocki device_links_missing_supplier(dev); 6879ed98953SRafael J. Wysocki ret = -EPROBE_DEFER; 6889ed98953SRafael J. Wysocki break; 6899ed98953SRafael J. Wysocki } 6909ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_CONSUMER_PROBE); 6919ed98953SRafael J. Wysocki } 6929ed98953SRafael J. Wysocki dev->links.status = DL_DEV_PROBING; 6939ed98953SRafael J. Wysocki 6949ed98953SRafael J. Wysocki device_links_write_unlock(); 6959ed98953SRafael J. Wysocki return ret; 6969ed98953SRafael J. Wysocki } 6979ed98953SRafael J. Wysocki 698fc5a251dSSaravana Kannan static void __device_links_supplier_sync_state(struct device *dev) 699fc5a251dSSaravana Kannan { 700fc5a251dSSaravana Kannan struct device_link *link; 701fc5a251dSSaravana Kannan 702fc5a251dSSaravana Kannan if (dev->state_synced) 703fc5a251dSSaravana Kannan return; 704fc5a251dSSaravana Kannan 705fc5a251dSSaravana Kannan list_for_each_entry(link, &dev->links.consumers, s_node) { 706fc5a251dSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED)) 707fc5a251dSSaravana Kannan continue; 708fc5a251dSSaravana Kannan if (link->status != DL_STATE_ACTIVE) 709fc5a251dSSaravana Kannan return; 710fc5a251dSSaravana Kannan } 711fc5a251dSSaravana Kannan 712fc5a251dSSaravana Kannan if (dev->bus->sync_state) 713fc5a251dSSaravana Kannan dev->bus->sync_state(dev); 714fc5a251dSSaravana Kannan else if (dev->driver && dev->driver->sync_state) 715fc5a251dSSaravana Kannan dev->driver->sync_state(dev); 716fc5a251dSSaravana Kannan 717fc5a251dSSaravana Kannan dev->state_synced = true; 718fc5a251dSSaravana Kannan } 719fc5a251dSSaravana Kannan 720fc5a251dSSaravana Kannan void device_links_supplier_sync_state_pause(void) 721fc5a251dSSaravana Kannan { 722fc5a251dSSaravana Kannan device_links_write_lock(); 723fc5a251dSSaravana Kannan defer_sync_state_count++; 724fc5a251dSSaravana Kannan device_links_write_unlock(); 725fc5a251dSSaravana Kannan } 726fc5a251dSSaravana Kannan 727fc5a251dSSaravana Kannan void device_links_supplier_sync_state_resume(void) 728fc5a251dSSaravana Kannan { 729fc5a251dSSaravana Kannan struct device *dev, *tmp; 730fc5a251dSSaravana Kannan 731fc5a251dSSaravana Kannan device_links_write_lock(); 732fc5a251dSSaravana Kannan if (!defer_sync_state_count) { 733fc5a251dSSaravana Kannan WARN(true, "Unmatched sync_state pause/resume!"); 734fc5a251dSSaravana Kannan goto out; 735fc5a251dSSaravana Kannan } 736fc5a251dSSaravana Kannan defer_sync_state_count--; 737fc5a251dSSaravana Kannan if (defer_sync_state_count) 738fc5a251dSSaravana Kannan goto out; 739fc5a251dSSaravana Kannan 740fc5a251dSSaravana Kannan list_for_each_entry_safe(dev, tmp, &deferred_sync, links.defer_sync) { 741fc5a251dSSaravana Kannan __device_links_supplier_sync_state(dev); 742fc5a251dSSaravana Kannan list_del_init(&dev->links.defer_sync); 743fc5a251dSSaravana Kannan } 744fc5a251dSSaravana Kannan out: 745fc5a251dSSaravana Kannan device_links_write_unlock(); 746fc5a251dSSaravana Kannan } 747fc5a251dSSaravana Kannan 748fc5a251dSSaravana Kannan static int sync_state_resume_initcall(void) 749fc5a251dSSaravana Kannan { 750fc5a251dSSaravana Kannan device_links_supplier_sync_state_resume(); 751fc5a251dSSaravana Kannan return 0; 752fc5a251dSSaravana Kannan } 753fc5a251dSSaravana Kannan late_initcall(sync_state_resume_initcall); 754fc5a251dSSaravana Kannan 755fc5a251dSSaravana Kannan static void __device_links_supplier_defer_sync(struct device *sup) 756fc5a251dSSaravana Kannan { 757fc5a251dSSaravana Kannan if (list_empty(&sup->links.defer_sync)) 758fc5a251dSSaravana Kannan list_add_tail(&sup->links.defer_sync, &deferred_sync); 759fc5a251dSSaravana Kannan } 760fc5a251dSSaravana Kannan 7619ed98953SRafael J. Wysocki /** 7629ed98953SRafael J. Wysocki * device_links_driver_bound - Update device links after probing its driver. 7639ed98953SRafael J. Wysocki * @dev: Device to update the links for. 7649ed98953SRafael J. Wysocki * 7659ed98953SRafael J. Wysocki * The probe has been successful, so update links from this device to any 7669ed98953SRafael J. Wysocki * consumers by changing their status to "available". 7679ed98953SRafael J. Wysocki * 7689ed98953SRafael J. Wysocki * Also change the status of @dev's links to suppliers to "active". 7699ed98953SRafael J. Wysocki * 770515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 7719ed98953SRafael J. Wysocki */ 7729ed98953SRafael J. Wysocki void device_links_driver_bound(struct device *dev) 7739ed98953SRafael J. Wysocki { 7749ed98953SRafael J. Wysocki struct device_link *link; 7759ed98953SRafael J. Wysocki 776bcbbcfd5SSaravana Kannan /* 777bcbbcfd5SSaravana Kannan * If a device probes successfully, it's expected to have created all 778bcbbcfd5SSaravana Kannan * the device links it needs to or make new device links as it needs 779bcbbcfd5SSaravana Kannan * them. So, it no longer needs to wait on any suppliers. 780bcbbcfd5SSaravana Kannan */ 781bcbbcfd5SSaravana Kannan mutex_lock(&wfs_lock); 782bcbbcfd5SSaravana Kannan list_del_init(&dev->links.needs_suppliers); 783bcbbcfd5SSaravana Kannan mutex_unlock(&wfs_lock); 784bcbbcfd5SSaravana Kannan 7859ed98953SRafael J. Wysocki device_links_write_lock(); 7869ed98953SRafael J. Wysocki 7879ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 788515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 7899ed98953SRafael J. Wysocki continue; 7909ed98953SRafael J. Wysocki 79115cfb094SRafael J. Wysocki /* 79215cfb094SRafael J. Wysocki * Links created during consumer probe may be in the "consumer 79315cfb094SRafael J. Wysocki * probe" state to start with if the supplier is still probing 79415cfb094SRafael J. Wysocki * when they are created and they may become "active" if the 79515cfb094SRafael J. Wysocki * consumer probe returns first. Skip them here. 79615cfb094SRafael J. Wysocki */ 79715cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE || 79815cfb094SRafael J. Wysocki link->status == DL_STATE_ACTIVE) 79915cfb094SRafael J. Wysocki continue; 80015cfb094SRafael J. Wysocki 8019ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_DORMANT); 8029ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 803e7dd4010SRafael J. Wysocki 804e7dd4010SRafael J. Wysocki if (link->flags & DL_FLAG_AUTOPROBE_CONSUMER) 805e7dd4010SRafael J. Wysocki driver_deferred_probe_add(link->consumer); 8069ed98953SRafael J. Wysocki } 8079ed98953SRafael J. Wysocki 8089ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.suppliers, c_node) { 809515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 8109ed98953SRafael J. Wysocki continue; 8119ed98953SRafael J. Wysocki 8129ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_CONSUMER_PROBE); 8139ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_ACTIVE); 814fc5a251dSSaravana Kannan 815fc5a251dSSaravana Kannan if (defer_sync_state_count) 816fc5a251dSSaravana Kannan __device_links_supplier_defer_sync(link->supplier); 817fc5a251dSSaravana Kannan else 818fc5a251dSSaravana Kannan __device_links_supplier_sync_state(link->supplier); 8199ed98953SRafael J. Wysocki } 8209ed98953SRafael J. Wysocki 8219ed98953SRafael J. Wysocki dev->links.status = DL_DEV_DRIVER_BOUND; 8229ed98953SRafael J. Wysocki 8239ed98953SRafael J. Wysocki device_links_write_unlock(); 8249ed98953SRafael J. Wysocki } 8259ed98953SRafael J. Wysocki 826515db266SRafael J. Wysocki static void device_link_drop_managed(struct device_link *link) 827515db266SRafael J. Wysocki { 828515db266SRafael J. Wysocki link->flags &= ~DL_FLAG_MANAGED; 829515db266SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_NONE); 830515db266SRafael J. Wysocki kref_put(&link->kref, __device_link_del); 831515db266SRafael J. Wysocki } 832515db266SRafael J. Wysocki 8339ed98953SRafael J. Wysocki /** 8349ed98953SRafael J. Wysocki * __device_links_no_driver - Update links of a device without a driver. 8359ed98953SRafael J. Wysocki * @dev: Device without a drvier. 8369ed98953SRafael J. Wysocki * 8379ed98953SRafael J. Wysocki * Delete all non-persistent links from this device to any suppliers. 8389ed98953SRafael J. Wysocki * 8399ed98953SRafael J. Wysocki * Persistent links stay around, but their status is changed to "available", 8409ed98953SRafael J. Wysocki * unless they already are in the "supplier unbind in progress" state in which 8419ed98953SRafael J. Wysocki * case they need not be updated. 8429ed98953SRafael J. Wysocki * 843515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 8449ed98953SRafael J. Wysocki */ 8459ed98953SRafael J. Wysocki static void __device_links_no_driver(struct device *dev) 8469ed98953SRafael J. Wysocki { 8479ed98953SRafael J. Wysocki struct device_link *link, *ln; 8489ed98953SRafael J. Wysocki 8499ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { 850515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 8519ed98953SRafael J. Wysocki continue; 8529ed98953SRafael J. Wysocki 853e88728f4SVivek Gautam if (link->flags & DL_FLAG_AUTOREMOVE_CONSUMER) 854515db266SRafael J. Wysocki device_link_drop_managed(link); 85515cfb094SRafael J. Wysocki else if (link->status == DL_STATE_CONSUMER_PROBE || 85615cfb094SRafael J. Wysocki link->status == DL_STATE_ACTIVE) 8579ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_AVAILABLE); 8589ed98953SRafael J. Wysocki } 8599ed98953SRafael J. Wysocki 8609ed98953SRafael J. Wysocki dev->links.status = DL_DEV_NO_DRIVER; 8619ed98953SRafael J. Wysocki } 8629ed98953SRafael J. Wysocki 86315cfb094SRafael J. Wysocki /** 86415cfb094SRafael J. Wysocki * device_links_no_driver - Update links after failing driver probe. 86515cfb094SRafael J. Wysocki * @dev: Device whose driver has just failed to probe. 86615cfb094SRafael J. Wysocki * 86715cfb094SRafael J. Wysocki * Clean up leftover links to consumers for @dev and invoke 86815cfb094SRafael J. Wysocki * %__device_links_no_driver() to update links to suppliers for it as 86915cfb094SRafael J. Wysocki * appropriate. 87015cfb094SRafael J. Wysocki * 871515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 87215cfb094SRafael J. Wysocki */ 8739ed98953SRafael J. Wysocki void device_links_no_driver(struct device *dev) 8749ed98953SRafael J. Wysocki { 87515cfb094SRafael J. Wysocki struct device_link *link; 87615cfb094SRafael J. Wysocki 8779ed98953SRafael J. Wysocki device_links_write_lock(); 87815cfb094SRafael J. Wysocki 87915cfb094SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 880515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 88115cfb094SRafael J. Wysocki continue; 88215cfb094SRafael J. Wysocki 88315cfb094SRafael J. Wysocki /* 88415cfb094SRafael J. Wysocki * The probe has failed, so if the status of the link is 88515cfb094SRafael J. Wysocki * "consumer probe" or "active", it must have been added by 88615cfb094SRafael J. Wysocki * a probing consumer while this device was still probing. 88715cfb094SRafael J. Wysocki * Change its state to "dormant", as it represents a valid 88815cfb094SRafael J. Wysocki * relationship, but it is not functionally meaningful. 88915cfb094SRafael J. Wysocki */ 89015cfb094SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE || 89115cfb094SRafael J. Wysocki link->status == DL_STATE_ACTIVE) 89215cfb094SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_DORMANT); 89315cfb094SRafael J. Wysocki } 89415cfb094SRafael J. Wysocki 8959ed98953SRafael J. Wysocki __device_links_no_driver(dev); 89615cfb094SRafael J. Wysocki 8979ed98953SRafael J. Wysocki device_links_write_unlock(); 8989ed98953SRafael J. Wysocki } 8999ed98953SRafael J. Wysocki 9009ed98953SRafael J. Wysocki /** 9019ed98953SRafael J. Wysocki * device_links_driver_cleanup - Update links after driver removal. 9029ed98953SRafael J. Wysocki * @dev: Device whose driver has just gone away. 9039ed98953SRafael J. Wysocki * 9049ed98953SRafael J. Wysocki * Update links to consumers for @dev by changing their status to "dormant" and 9059ed98953SRafael J. Wysocki * invoke %__device_links_no_driver() to update links to suppliers for it as 9069ed98953SRafael J. Wysocki * appropriate. 9079ed98953SRafael J. Wysocki * 908515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 9099ed98953SRafael J. Wysocki */ 9109ed98953SRafael J. Wysocki void device_links_driver_cleanup(struct device *dev) 9119ed98953SRafael J. Wysocki { 912c8d50986SRafael J. Wysocki struct device_link *link, *ln; 9139ed98953SRafael J. Wysocki 9149ed98953SRafael J. Wysocki device_links_write_lock(); 9159ed98953SRafael J. Wysocki 916c8d50986SRafael J. Wysocki list_for_each_entry_safe(link, ln, &dev->links.consumers, s_node) { 917515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 9189ed98953SRafael J. Wysocki continue; 9199ed98953SRafael J. Wysocki 920e88728f4SVivek Gautam WARN_ON(link->flags & DL_FLAG_AUTOREMOVE_CONSUMER); 9219ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_SUPPLIER_UNBIND); 9221689cac5SVivek Gautam 9231689cac5SVivek Gautam /* 9241689cac5SVivek Gautam * autoremove the links between this @dev and its consumer 9251689cac5SVivek Gautam * devices that are not active, i.e. where the link state 9261689cac5SVivek Gautam * has moved to DL_STATE_SUPPLIER_UNBIND. 9271689cac5SVivek Gautam */ 9281689cac5SVivek Gautam if (link->status == DL_STATE_SUPPLIER_UNBIND && 9291689cac5SVivek Gautam link->flags & DL_FLAG_AUTOREMOVE_SUPPLIER) 930515db266SRafael J. Wysocki device_link_drop_managed(link); 9311689cac5SVivek Gautam 9329ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_DORMANT); 9339ed98953SRafael J. Wysocki } 9349ed98953SRafael J. Wysocki 935fc5a251dSSaravana Kannan list_del_init(&dev->links.defer_sync); 9369ed98953SRafael J. Wysocki __device_links_no_driver(dev); 9379ed98953SRafael J. Wysocki 9389ed98953SRafael J. Wysocki device_links_write_unlock(); 9399ed98953SRafael J. Wysocki } 9409ed98953SRafael J. Wysocki 9419ed98953SRafael J. Wysocki /** 9429ed98953SRafael J. Wysocki * device_links_busy - Check if there are any busy links to consumers. 9439ed98953SRafael J. Wysocki * @dev: Device to check. 9449ed98953SRafael J. Wysocki * 9459ed98953SRafael J. Wysocki * Check each consumer of the device and return 'true' if its link's status 9469ed98953SRafael J. Wysocki * is one of "consumer probe" or "active" (meaning that the given consumer is 9479ed98953SRafael J. Wysocki * probing right now or its driver is present). Otherwise, change the link 9489ed98953SRafael J. Wysocki * state to "supplier unbind" to prevent the consumer from being probed 9499ed98953SRafael J. Wysocki * successfully going forward. 9509ed98953SRafael J. Wysocki * 9519ed98953SRafael J. Wysocki * Return 'false' if there are no probing or active consumers. 9529ed98953SRafael J. Wysocki * 953515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 9549ed98953SRafael J. Wysocki */ 9559ed98953SRafael J. Wysocki bool device_links_busy(struct device *dev) 9569ed98953SRafael J. Wysocki { 9579ed98953SRafael J. Wysocki struct device_link *link; 9589ed98953SRafael J. Wysocki bool ret = false; 9599ed98953SRafael J. Wysocki 9609ed98953SRafael J. Wysocki device_links_write_lock(); 9619ed98953SRafael J. Wysocki 9629ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 963515db266SRafael J. Wysocki if (!(link->flags & DL_FLAG_MANAGED)) 9649ed98953SRafael J. Wysocki continue; 9659ed98953SRafael J. Wysocki 9669ed98953SRafael J. Wysocki if (link->status == DL_STATE_CONSUMER_PROBE 9679ed98953SRafael J. Wysocki || link->status == DL_STATE_ACTIVE) { 9689ed98953SRafael J. Wysocki ret = true; 9699ed98953SRafael J. Wysocki break; 9709ed98953SRafael J. Wysocki } 9719ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); 9729ed98953SRafael J. Wysocki } 9739ed98953SRafael J. Wysocki 9749ed98953SRafael J. Wysocki dev->links.status = DL_DEV_UNBINDING; 9759ed98953SRafael J. Wysocki 9769ed98953SRafael J. Wysocki device_links_write_unlock(); 9779ed98953SRafael J. Wysocki return ret; 9789ed98953SRafael J. Wysocki } 9799ed98953SRafael J. Wysocki 9809ed98953SRafael J. Wysocki /** 9819ed98953SRafael J. Wysocki * device_links_unbind_consumers - Force unbind consumers of the given device. 9829ed98953SRafael J. Wysocki * @dev: Device to unbind the consumers of. 9839ed98953SRafael J. Wysocki * 9849ed98953SRafael J. Wysocki * Walk the list of links to consumers for @dev and if any of them is in the 9859ed98953SRafael J. Wysocki * "consumer probe" state, wait for all device probes in progress to complete 9869ed98953SRafael J. Wysocki * and start over. 9879ed98953SRafael J. Wysocki * 9889ed98953SRafael J. Wysocki * If that's not the case, change the status of the link to "supplier unbind" 9899ed98953SRafael J. Wysocki * and check if the link was in the "active" state. If so, force the consumer 9909ed98953SRafael J. Wysocki * driver to unbind and start over (the consumer will not re-probe as we have 9919ed98953SRafael J. Wysocki * changed the state of the link already). 9929ed98953SRafael J. Wysocki * 993515db266SRafael J. Wysocki * Links without the DL_FLAG_MANAGED flag set are ignored. 9949ed98953SRafael J. Wysocki */ 9959ed98953SRafael J. Wysocki void device_links_unbind_consumers(struct device *dev) 9969ed98953SRafael J. Wysocki { 9979ed98953SRafael J. Wysocki struct device_link *link; 9989ed98953SRafael J. Wysocki 9999ed98953SRafael J. Wysocki start: 10009ed98953SRafael J. Wysocki device_links_write_lock(); 10019ed98953SRafael J. Wysocki 10029ed98953SRafael J. Wysocki list_for_each_entry(link, &dev->links.consumers, s_node) { 10039ed98953SRafael J. Wysocki enum device_link_state status; 10049ed98953SRafael J. Wysocki 100505ef983eSSaravana Kannan if (!(link->flags & DL_FLAG_MANAGED) || 100605ef983eSSaravana Kannan link->flags & DL_FLAG_SYNC_STATE_ONLY) 10079ed98953SRafael J. Wysocki continue; 10089ed98953SRafael J. Wysocki 10099ed98953SRafael J. Wysocki status = link->status; 10109ed98953SRafael J. Wysocki if (status == DL_STATE_CONSUMER_PROBE) { 10119ed98953SRafael J. Wysocki device_links_write_unlock(); 10129ed98953SRafael J. Wysocki 10139ed98953SRafael J. Wysocki wait_for_device_probe(); 10149ed98953SRafael J. Wysocki goto start; 10159ed98953SRafael J. Wysocki } 10169ed98953SRafael J. Wysocki WRITE_ONCE(link->status, DL_STATE_SUPPLIER_UNBIND); 10179ed98953SRafael J. Wysocki if (status == DL_STATE_ACTIVE) { 10189ed98953SRafael J. Wysocki struct device *consumer = link->consumer; 10199ed98953SRafael J. Wysocki 10209ed98953SRafael J. Wysocki get_device(consumer); 10219ed98953SRafael J. Wysocki 10229ed98953SRafael J. Wysocki device_links_write_unlock(); 10239ed98953SRafael J. Wysocki 10249ed98953SRafael J. Wysocki device_release_driver_internal(consumer, NULL, 10259ed98953SRafael J. Wysocki consumer->parent); 10269ed98953SRafael J. Wysocki put_device(consumer); 10279ed98953SRafael J. Wysocki goto start; 10289ed98953SRafael J. Wysocki } 10299ed98953SRafael J. Wysocki } 10309ed98953SRafael J. Wysocki 10319ed98953SRafael J. Wysocki device_links_write_unlock(); 10329ed98953SRafael J. Wysocki } 10339ed98953SRafael J. Wysocki 10349ed98953SRafael J. Wysocki /** 10359ed98953SRafael J. Wysocki * device_links_purge - Delete existing links to other devices. 10369ed98953SRafael J. Wysocki * @dev: Target device. 10379ed98953SRafael J. Wysocki */ 10389ed98953SRafael J. Wysocki static void device_links_purge(struct device *dev) 10399ed98953SRafael J. Wysocki { 10409ed98953SRafael J. Wysocki struct device_link *link, *ln; 10419ed98953SRafael J. Wysocki 1042e2ae9bccSSaravana Kannan mutex_lock(&wfs_lock); 1043e2ae9bccSSaravana Kannan list_del(&dev->links.needs_suppliers); 1044e2ae9bccSSaravana Kannan mutex_unlock(&wfs_lock); 1045e2ae9bccSSaravana Kannan 10469ed98953SRafael J. Wysocki /* 10479ed98953SRafael J. Wysocki * Delete all of the remaining links from this device to any other 10489ed98953SRafael J. Wysocki * devices (either consumers or suppliers). 10499ed98953SRafael J. Wysocki */ 10509ed98953SRafael J. Wysocki device_links_write_lock(); 10519ed98953SRafael J. Wysocki 10529ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) { 10539ed98953SRafael J. Wysocki WARN_ON(link->status == DL_STATE_ACTIVE); 1054ead18c23SLukas Wunner __device_link_del(&link->kref); 10559ed98953SRafael J. Wysocki } 10569ed98953SRafael J. Wysocki 10579ed98953SRafael J. Wysocki list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) { 10589ed98953SRafael J. Wysocki WARN_ON(link->status != DL_STATE_DORMANT && 10599ed98953SRafael J. Wysocki link->status != DL_STATE_NONE); 1060ead18c23SLukas Wunner __device_link_del(&link->kref); 10619ed98953SRafael J. Wysocki } 10629ed98953SRafael J. Wysocki 10639ed98953SRafael J. Wysocki device_links_write_unlock(); 10649ed98953SRafael J. Wysocki } 10659ed98953SRafael J. Wysocki 10669ed98953SRafael J. Wysocki /* Device links support end. */ 10679ed98953SRafael J. Wysocki 10681da177e4SLinus Torvalds int (*platform_notify)(struct device *dev) = NULL; 10691da177e4SLinus Torvalds int (*platform_notify_remove)(struct device *dev) = NULL; 1070e105b8bfSDan Williams static struct kobject *dev_kobj; 1071e105b8bfSDan Williams struct kobject *sysfs_dev_char_kobj; 1072e105b8bfSDan Williams struct kobject *sysfs_dev_block_kobj; 10731da177e4SLinus Torvalds 10745e33bc41SRafael J. Wysocki static DEFINE_MUTEX(device_hotplug_lock); 10755e33bc41SRafael J. Wysocki 10765e33bc41SRafael J. Wysocki void lock_device_hotplug(void) 10775e33bc41SRafael J. Wysocki { 10785e33bc41SRafael J. Wysocki mutex_lock(&device_hotplug_lock); 10795e33bc41SRafael J. Wysocki } 10805e33bc41SRafael J. Wysocki 10815e33bc41SRafael J. Wysocki void unlock_device_hotplug(void) 10825e33bc41SRafael J. Wysocki { 10835e33bc41SRafael J. Wysocki mutex_unlock(&device_hotplug_lock); 10845e33bc41SRafael J. Wysocki } 10855e33bc41SRafael J. Wysocki 10865e33bc41SRafael J. Wysocki int lock_device_hotplug_sysfs(void) 10875e33bc41SRafael J. Wysocki { 10885e33bc41SRafael J. Wysocki if (mutex_trylock(&device_hotplug_lock)) 10895e33bc41SRafael J. Wysocki return 0; 10905e33bc41SRafael J. Wysocki 10915e33bc41SRafael J. Wysocki /* Avoid busy looping (5 ms of sleep should do). */ 10925e33bc41SRafael J. Wysocki msleep(5); 10935e33bc41SRafael J. Wysocki return restart_syscall(); 10945e33bc41SRafael J. Wysocki } 10955e33bc41SRafael J. Wysocki 10964e886c29SGreg Kroah-Hartman #ifdef CONFIG_BLOCK 10974e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 10984e886c29SGreg Kroah-Hartman { 10994e886c29SGreg Kroah-Hartman return !(dev->type == &part_type); 11004e886c29SGreg Kroah-Hartman } 11014e886c29SGreg Kroah-Hartman #else 11024e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 11034e886c29SGreg Kroah-Hartman { 11044e886c29SGreg Kroah-Hartman return 1; 11054e886c29SGreg Kroah-Hartman } 11064e886c29SGreg Kroah-Hartman #endif 11071da177e4SLinus Torvalds 110807de0e86SHeikki Krogerus static int 110907de0e86SHeikki Krogerus device_platform_notify(struct device *dev, enum kobject_action action) 111007de0e86SHeikki Krogerus { 11117847a145SHeikki Krogerus int ret; 11127847a145SHeikki Krogerus 11137847a145SHeikki Krogerus ret = acpi_platform_notify(dev, action); 11147847a145SHeikki Krogerus if (ret) 11157847a145SHeikki Krogerus return ret; 11167847a145SHeikki Krogerus 111759abd836SHeikki Krogerus ret = software_node_notify(dev, action); 111859abd836SHeikki Krogerus if (ret) 111959abd836SHeikki Krogerus return ret; 112059abd836SHeikki Krogerus 112107de0e86SHeikki Krogerus if (platform_notify && action == KOBJ_ADD) 112207de0e86SHeikki Krogerus platform_notify(dev); 112307de0e86SHeikki Krogerus else if (platform_notify_remove && action == KOBJ_REMOVE) 112407de0e86SHeikki Krogerus platform_notify_remove(dev); 112507de0e86SHeikki Krogerus return 0; 112607de0e86SHeikki Krogerus } 112707de0e86SHeikki Krogerus 11283e95637aSAlan Stern /** 11293e95637aSAlan Stern * dev_driver_string - Return a device's driver name, if at all possible 11303e95637aSAlan Stern * @dev: struct device to get the name of 11313e95637aSAlan Stern * 11323e95637aSAlan Stern * Will return the device's driver's name if it is bound to a device. If 11339169c012Syan * the device is not bound to a driver, it will return the name of the bus 11343e95637aSAlan Stern * it is attached to. If it is not attached to a bus either, an empty 11353e95637aSAlan Stern * string will be returned. 11363e95637aSAlan Stern */ 1137bf9ca69fSJean Delvare const char *dev_driver_string(const struct device *dev) 11383e95637aSAlan Stern { 11393589972eSAlan Stern struct device_driver *drv; 11403589972eSAlan Stern 11413589972eSAlan Stern /* dev->driver can change to NULL underneath us because of unbinding, 11423589972eSAlan Stern * so be careful about accessing it. dev->bus and dev->class should 11433589972eSAlan Stern * never change once they are set, so they don't need special care. 11443589972eSAlan Stern */ 11456aa7de05SMark Rutland drv = READ_ONCE(dev->driver); 11463589972eSAlan Stern return drv ? drv->name : 1147a456b702SJean Delvare (dev->bus ? dev->bus->name : 1148a456b702SJean Delvare (dev->class ? dev->class->name : "")); 11493e95637aSAlan Stern } 1150310a922dSMatthew Wilcox EXPORT_SYMBOL(dev_driver_string); 11513e95637aSAlan Stern 11521da177e4SLinus Torvalds #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) 11531da177e4SLinus Torvalds 11544a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, 11554a3ad20cSGreg Kroah-Hartman char *buf) 11561da177e4SLinus Torvalds { 11571da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 1158b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 11594a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds if (dev_attr->show) 116254b6f35cSYani Ioannou ret = dev_attr->show(dev, dev_attr, buf); 1163815d2d50SAndrew Morton if (ret >= (ssize_t)PAGE_SIZE) { 1164a52668c6SSergey Senozhatsky printk("dev_attr_show: %pS returned bad count\n", 1165a52668c6SSergey Senozhatsky dev_attr->show); 1166815d2d50SAndrew Morton } 11671da177e4SLinus Torvalds return ret; 11681da177e4SLinus Torvalds } 11691da177e4SLinus Torvalds 11704a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, 11711da177e4SLinus Torvalds const char *buf, size_t count) 11721da177e4SLinus Torvalds { 11731da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 1174b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 11754a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds if (dev_attr->store) 117854b6f35cSYani Ioannou ret = dev_attr->store(dev, dev_attr, buf, count); 11791da177e4SLinus Torvalds return ret; 11801da177e4SLinus Torvalds } 11811da177e4SLinus Torvalds 118252cf25d0SEmese Revfy static const struct sysfs_ops dev_sysfs_ops = { 11831da177e4SLinus Torvalds .show = dev_attr_show, 11841da177e4SLinus Torvalds .store = dev_attr_store, 11851da177e4SLinus Torvalds }; 11861da177e4SLinus Torvalds 1187ca22e56dSKay Sievers #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) 1188ca22e56dSKay Sievers 1189ca22e56dSKay Sievers ssize_t device_store_ulong(struct device *dev, 1190ca22e56dSKay Sievers struct device_attribute *attr, 1191ca22e56dSKay Sievers const char *buf, size_t size) 1192ca22e56dSKay Sievers { 1193ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 1194f88184bfSKaitao cheng int ret; 1195f88184bfSKaitao cheng unsigned long new; 1196f88184bfSKaitao cheng 1197f88184bfSKaitao cheng ret = kstrtoul(buf, 0, &new); 1198f88184bfSKaitao cheng if (ret) 1199f88184bfSKaitao cheng return ret; 1200ca22e56dSKay Sievers *(unsigned long *)(ea->var) = new; 1201ca22e56dSKay Sievers /* Always return full write size even if we didn't consume all */ 1202ca22e56dSKay Sievers return size; 1203ca22e56dSKay Sievers } 1204ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_store_ulong); 1205ca22e56dSKay Sievers 1206ca22e56dSKay Sievers ssize_t device_show_ulong(struct device *dev, 1207ca22e56dSKay Sievers struct device_attribute *attr, 1208ca22e56dSKay Sievers char *buf) 1209ca22e56dSKay Sievers { 1210ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 1211ca22e56dSKay Sievers return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); 1212ca22e56dSKay Sievers } 1213ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_show_ulong); 1214ca22e56dSKay Sievers 1215ca22e56dSKay Sievers ssize_t device_store_int(struct device *dev, 1216ca22e56dSKay Sievers struct device_attribute *attr, 1217ca22e56dSKay Sievers const char *buf, size_t size) 1218ca22e56dSKay Sievers { 1219ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 1220f88184bfSKaitao cheng int ret; 1221f88184bfSKaitao cheng long new; 1222f88184bfSKaitao cheng 1223f88184bfSKaitao cheng ret = kstrtol(buf, 0, &new); 1224f88184bfSKaitao cheng if (ret) 1225f88184bfSKaitao cheng return ret; 1226f88184bfSKaitao cheng 1227f88184bfSKaitao cheng if (new > INT_MAX || new < INT_MIN) 1228ca22e56dSKay Sievers return -EINVAL; 1229ca22e56dSKay Sievers *(int *)(ea->var) = new; 1230ca22e56dSKay Sievers /* Always return full write size even if we didn't consume all */ 1231ca22e56dSKay Sievers return size; 1232ca22e56dSKay Sievers } 1233ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_store_int); 1234ca22e56dSKay Sievers 1235ca22e56dSKay Sievers ssize_t device_show_int(struct device *dev, 1236ca22e56dSKay Sievers struct device_attribute *attr, 1237ca22e56dSKay Sievers char *buf) 1238ca22e56dSKay Sievers { 1239ca22e56dSKay Sievers struct dev_ext_attribute *ea = to_ext_attr(attr); 1240ca22e56dSKay Sievers 1241ca22e56dSKay Sievers return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); 1242ca22e56dSKay Sievers } 1243ca22e56dSKay Sievers EXPORT_SYMBOL_GPL(device_show_int); 12441da177e4SLinus Torvalds 124591872392SBorislav Petkov ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, 124691872392SBorislav Petkov const char *buf, size_t size) 124791872392SBorislav Petkov { 124891872392SBorislav Petkov struct dev_ext_attribute *ea = to_ext_attr(attr); 124991872392SBorislav Petkov 125091872392SBorislav Petkov if (strtobool(buf, ea->var) < 0) 125191872392SBorislav Petkov return -EINVAL; 125291872392SBorislav Petkov 125391872392SBorislav Petkov return size; 125491872392SBorislav Petkov } 125591872392SBorislav Petkov EXPORT_SYMBOL_GPL(device_store_bool); 125691872392SBorislav Petkov 125791872392SBorislav Petkov ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, 125891872392SBorislav Petkov char *buf) 125991872392SBorislav Petkov { 126091872392SBorislav Petkov struct dev_ext_attribute *ea = to_ext_attr(attr); 126191872392SBorislav Petkov 126291872392SBorislav Petkov return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); 126391872392SBorislav Petkov } 126491872392SBorislav Petkov EXPORT_SYMBOL_GPL(device_show_bool); 126591872392SBorislav Petkov 12661da177e4SLinus Torvalds /** 12671da177e4SLinus Torvalds * device_release - free device structure. 12681da177e4SLinus Torvalds * @kobj: device's kobject. 12691da177e4SLinus Torvalds * 12701da177e4SLinus Torvalds * This is called once the reference count for the object 12711da177e4SLinus Torvalds * reaches 0. We forward the call to the device's release 12721da177e4SLinus Torvalds * method, which should handle actually freeing the structure. 12731da177e4SLinus Torvalds */ 12741da177e4SLinus Torvalds static void device_release(struct kobject *kobj) 12751da177e4SLinus Torvalds { 1276b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 1277fb069a5dSGreg Kroah-Hartman struct device_private *p = dev->p; 12781da177e4SLinus Torvalds 1279a525a3ddSMing Lei /* 1280a525a3ddSMing Lei * Some platform devices are driven without driver attached 1281a525a3ddSMing Lei * and managed resources may have been acquired. Make sure 1282a525a3ddSMing Lei * all resources are released. 1283a525a3ddSMing Lei * 1284a525a3ddSMing Lei * Drivers still can add resources into device after device 1285a525a3ddSMing Lei * is deleted but alive, so release devres here to avoid 1286a525a3ddSMing Lei * possible memory leak. 1287a525a3ddSMing Lei */ 1288a525a3ddSMing Lei devres_release_all(dev); 1289a525a3ddSMing Lei 12901da177e4SLinus Torvalds if (dev->release) 12911da177e4SLinus Torvalds dev->release(dev); 1292f9f852dfSKay Sievers else if (dev->type && dev->type->release) 1293f9f852dfSKay Sievers dev->type->release(dev); 12942620efefSGreg Kroah-Hartman else if (dev->class && dev->class->dev_release) 12952620efefSGreg Kroah-Hartman dev->class->dev_release(dev); 1296f810a5cfSArjan van de Ven else 1297186bddb2SEzequiel Garcia WARN(1, KERN_ERR "Device '%s' does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt.\n", 12981e0b2cf9SKay Sievers dev_name(dev)); 1299fb069a5dSGreg Kroah-Hartman kfree(p); 13001da177e4SLinus Torvalds } 13011da177e4SLinus Torvalds 1302bc451f20SEric W. Biederman static const void *device_namespace(struct kobject *kobj) 1303bc451f20SEric W. Biederman { 1304b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 1305bc451f20SEric W. Biederman const void *ns = NULL; 1306bc451f20SEric W. Biederman 1307bc451f20SEric W. Biederman if (dev->class && dev->class->ns_type) 1308bc451f20SEric W. Biederman ns = dev->class->namespace(dev); 1309bc451f20SEric W. Biederman 1310bc451f20SEric W. Biederman return ns; 1311bc451f20SEric W. Biederman } 1312bc451f20SEric W. Biederman 13139944e894SDmitry Torokhov static void device_get_ownership(struct kobject *kobj, kuid_t *uid, kgid_t *gid) 13149944e894SDmitry Torokhov { 13159944e894SDmitry Torokhov struct device *dev = kobj_to_dev(kobj); 13169944e894SDmitry Torokhov 13179944e894SDmitry Torokhov if (dev->class && dev->class->get_ownership) 13189944e894SDmitry Torokhov dev->class->get_ownership(dev, uid, gid); 13199944e894SDmitry Torokhov } 13209944e894SDmitry Torokhov 13218f4afc41SGreg Kroah-Hartman static struct kobj_type device_ktype = { 13221da177e4SLinus Torvalds .release = device_release, 13231da177e4SLinus Torvalds .sysfs_ops = &dev_sysfs_ops, 1324bc451f20SEric W. Biederman .namespace = device_namespace, 13259944e894SDmitry Torokhov .get_ownership = device_get_ownership, 13261da177e4SLinus Torvalds }; 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds 1329312c004dSKay Sievers static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) 13301da177e4SLinus Torvalds { 13311da177e4SLinus Torvalds struct kobj_type *ktype = get_ktype(kobj); 13321da177e4SLinus Torvalds 13338f4afc41SGreg Kroah-Hartman if (ktype == &device_ktype) { 1334b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 13351da177e4SLinus Torvalds if (dev->bus) 13361da177e4SLinus Torvalds return 1; 133723681e47SGreg Kroah-Hartman if (dev->class) 133823681e47SGreg Kroah-Hartman return 1; 13391da177e4SLinus Torvalds } 13401da177e4SLinus Torvalds return 0; 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds 1343312c004dSKay Sievers static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) 13441da177e4SLinus Torvalds { 1345b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 13461da177e4SLinus Torvalds 134723681e47SGreg Kroah-Hartman if (dev->bus) 13481da177e4SLinus Torvalds return dev->bus->name; 134923681e47SGreg Kroah-Hartman if (dev->class) 135023681e47SGreg Kroah-Hartman return dev->class->name; 135123681e47SGreg Kroah-Hartman return NULL; 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds 13547eff2e7aSKay Sievers static int dev_uevent(struct kset *kset, struct kobject *kobj, 13557eff2e7aSKay Sievers struct kobj_uevent_env *env) 13561da177e4SLinus Torvalds { 1357b0d1f807SLars-Peter Clausen struct device *dev = kobj_to_dev(kobj); 13581da177e4SLinus Torvalds int retval = 0; 13591da177e4SLinus Torvalds 13606fcf53acSKay Sievers /* add device node properties if present */ 136123681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 13626fcf53acSKay Sievers const char *tmp; 13636fcf53acSKay Sievers const char *name; 13642c9ede55SAl Viro umode_t mode = 0; 13654e4098a3SGreg Kroah-Hartman kuid_t uid = GLOBAL_ROOT_UID; 13664e4098a3SGreg Kroah-Hartman kgid_t gid = GLOBAL_ROOT_GID; 13676fcf53acSKay Sievers 13687eff2e7aSKay Sievers add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); 13697eff2e7aSKay Sievers add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); 13703c2670e6SKay Sievers name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); 13716fcf53acSKay Sievers if (name) { 13726fcf53acSKay Sievers add_uevent_var(env, "DEVNAME=%s", name); 1373e454cea2SKay Sievers if (mode) 1374e454cea2SKay Sievers add_uevent_var(env, "DEVMODE=%#o", mode & 0777); 13754e4098a3SGreg Kroah-Hartman if (!uid_eq(uid, GLOBAL_ROOT_UID)) 13764e4098a3SGreg Kroah-Hartman add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); 13774e4098a3SGreg Kroah-Hartman if (!gid_eq(gid, GLOBAL_ROOT_GID)) 13784e4098a3SGreg Kroah-Hartman add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); 13793c2670e6SKay Sievers kfree(tmp); 13806fcf53acSKay Sievers } 138123681e47SGreg Kroah-Hartman } 138223681e47SGreg Kroah-Hartman 1383414264f9SKay Sievers if (dev->type && dev->type->name) 13847eff2e7aSKay Sievers add_uevent_var(env, "DEVTYPE=%s", dev->type->name); 1385414264f9SKay Sievers 1386239378f1SKay Sievers if (dev->driver) 13877eff2e7aSKay Sievers add_uevent_var(env, "DRIVER=%s", dev->driver->name); 1388239378f1SKay Sievers 138907d57a32SGrant Likely /* Add common DT information about the device */ 139007d57a32SGrant Likely of_device_uevent(dev, env); 139107d57a32SGrant Likely 13921da177e4SLinus Torvalds /* have the bus specific function add its stuff */ 13937eff2e7aSKay Sievers if (dev->bus && dev->bus->uevent) { 13947eff2e7aSKay Sievers retval = dev->bus->uevent(dev, env); 1395f9f852dfSKay Sievers if (retval) 13967dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: bus uevent() returned %d\n", 13971e0b2cf9SKay Sievers dev_name(dev), __func__, retval); 13981da177e4SLinus Torvalds } 13991da177e4SLinus Torvalds 14002620efefSGreg Kroah-Hartman /* have the class specific function add its stuff */ 14017eff2e7aSKay Sievers if (dev->class && dev->class->dev_uevent) { 14027eff2e7aSKay Sievers retval = dev->class->dev_uevent(dev, env); 1403f9f852dfSKay Sievers if (retval) 14047dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: class uevent() " 14051e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 14062b3a302aSHarvey Harrison __func__, retval); 14072620efefSGreg Kroah-Hartman } 1408f9f852dfSKay Sievers 1409eef35c2dSStefan Weil /* have the device type specific function add its stuff */ 14107eff2e7aSKay Sievers if (dev->type && dev->type->uevent) { 14117eff2e7aSKay Sievers retval = dev->type->uevent(dev, env); 1412f9f852dfSKay Sievers if (retval) 14137dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: dev_type uevent() " 14141e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 14152b3a302aSHarvey Harrison __func__, retval); 14162620efefSGreg Kroah-Hartman } 14172620efefSGreg Kroah-Hartman 14181da177e4SLinus Torvalds return retval; 14191da177e4SLinus Torvalds } 14201da177e4SLinus Torvalds 14219cd43611SEmese Revfy static const struct kset_uevent_ops device_uevent_ops = { 1422312c004dSKay Sievers .filter = dev_uevent_filter, 1423312c004dSKay Sievers .name = dev_uevent_name, 1424312c004dSKay Sievers .uevent = dev_uevent, 14251da177e4SLinus Torvalds }; 14261da177e4SLinus Torvalds 1427c5e064a6SGreg Kroah-Hartman static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, 142816574dccSKay Sievers char *buf) 142916574dccSKay Sievers { 143016574dccSKay Sievers struct kobject *top_kobj; 143116574dccSKay Sievers struct kset *kset; 14327eff2e7aSKay Sievers struct kobj_uevent_env *env = NULL; 143316574dccSKay Sievers int i; 143416574dccSKay Sievers size_t count = 0; 143516574dccSKay Sievers int retval; 143616574dccSKay Sievers 143716574dccSKay Sievers /* search the kset, the device belongs to */ 143816574dccSKay Sievers top_kobj = &dev->kobj; 14395c5daf65SKay Sievers while (!top_kobj->kset && top_kobj->parent) 144016574dccSKay Sievers top_kobj = top_kobj->parent; 144116574dccSKay Sievers if (!top_kobj->kset) 144216574dccSKay Sievers goto out; 14435c5daf65SKay Sievers 144416574dccSKay Sievers kset = top_kobj->kset; 144516574dccSKay Sievers if (!kset->uevent_ops || !kset->uevent_ops->uevent) 144616574dccSKay Sievers goto out; 144716574dccSKay Sievers 144816574dccSKay Sievers /* respect filter */ 144916574dccSKay Sievers if (kset->uevent_ops && kset->uevent_ops->filter) 145016574dccSKay Sievers if (!kset->uevent_ops->filter(kset, &dev->kobj)) 145116574dccSKay Sievers goto out; 145216574dccSKay Sievers 14537eff2e7aSKay Sievers env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 14547eff2e7aSKay Sievers if (!env) 1455c7308c81SGreg Kroah-Hartman return -ENOMEM; 1456c7308c81SGreg Kroah-Hartman 145716574dccSKay Sievers /* let the kset specific function add its keys */ 14587eff2e7aSKay Sievers retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); 145916574dccSKay Sievers if (retval) 146016574dccSKay Sievers goto out; 146116574dccSKay Sievers 146216574dccSKay Sievers /* copy keys to file */ 14637eff2e7aSKay Sievers for (i = 0; i < env->envp_idx; i++) 14647eff2e7aSKay Sievers count += sprintf(&buf[count], "%s\n", env->envp[i]); 146516574dccSKay Sievers out: 14667eff2e7aSKay Sievers kfree(env); 146716574dccSKay Sievers return count; 146816574dccSKay Sievers } 146916574dccSKay Sievers 1470c5e064a6SGreg Kroah-Hartman static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, 1471a7fd6706SKay Sievers const char *buf, size_t count) 1472a7fd6706SKay Sievers { 1473df44b479SPeter Rajnoha int rc; 1474df44b479SPeter Rajnoha 1475df44b479SPeter Rajnoha rc = kobject_synth_uevent(&dev->kobj, buf, count); 1476df44b479SPeter Rajnoha 1477df44b479SPeter Rajnoha if (rc) { 1478f36776faSPeter Rajnoha dev_err(dev, "uevent: failed to send synthetic uevent\n"); 1479df44b479SPeter Rajnoha return rc; 1480df44b479SPeter Rajnoha } 148160a96a59SKay Sievers 1482a7fd6706SKay Sievers return count; 1483a7fd6706SKay Sievers } 1484c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RW(uevent); 1485a7fd6706SKay Sievers 1486c5e064a6SGreg Kroah-Hartman static ssize_t online_show(struct device *dev, struct device_attribute *attr, 14874f3549d7SRafael J. Wysocki char *buf) 14884f3549d7SRafael J. Wysocki { 14894f3549d7SRafael J. Wysocki bool val; 14904f3549d7SRafael J. Wysocki 14915e33bc41SRafael J. Wysocki device_lock(dev); 14924f3549d7SRafael J. Wysocki val = !dev->offline; 14935e33bc41SRafael J. Wysocki device_unlock(dev); 14944f3549d7SRafael J. Wysocki return sprintf(buf, "%u\n", val); 14954f3549d7SRafael J. Wysocki } 14964f3549d7SRafael J. Wysocki 1497c5e064a6SGreg Kroah-Hartman static ssize_t online_store(struct device *dev, struct device_attribute *attr, 14984f3549d7SRafael J. Wysocki const char *buf, size_t count) 14994f3549d7SRafael J. Wysocki { 15004f3549d7SRafael J. Wysocki bool val; 15014f3549d7SRafael J. Wysocki int ret; 15024f3549d7SRafael J. Wysocki 15034f3549d7SRafael J. Wysocki ret = strtobool(buf, &val); 15044f3549d7SRafael J. Wysocki if (ret < 0) 15054f3549d7SRafael J. Wysocki return ret; 15064f3549d7SRafael J. Wysocki 15075e33bc41SRafael J. Wysocki ret = lock_device_hotplug_sysfs(); 15085e33bc41SRafael J. Wysocki if (ret) 15095e33bc41SRafael J. Wysocki return ret; 15105e33bc41SRafael J. Wysocki 15114f3549d7SRafael J. Wysocki ret = val ? device_online(dev) : device_offline(dev); 15124f3549d7SRafael J. Wysocki unlock_device_hotplug(); 15134f3549d7SRafael J. Wysocki return ret < 0 ? ret : count; 15144f3549d7SRafael J. Wysocki } 1515c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RW(online); 15164f3549d7SRafael J. Wysocki 1517fa6fdb33SGreg Kroah-Hartman int device_add_groups(struct device *dev, const struct attribute_group **groups) 1518621a1672SDmitry Torokhov { 15193e9b2baeSGreg Kroah-Hartman return sysfs_create_groups(&dev->kobj, groups); 1520621a1672SDmitry Torokhov } 1521a7670d42SDmitry Torokhov EXPORT_SYMBOL_GPL(device_add_groups); 1522621a1672SDmitry Torokhov 1523fa6fdb33SGreg Kroah-Hartman void device_remove_groups(struct device *dev, 1524a4dbd674SDavid Brownell const struct attribute_group **groups) 1525621a1672SDmitry Torokhov { 15263e9b2baeSGreg Kroah-Hartman sysfs_remove_groups(&dev->kobj, groups); 1527621a1672SDmitry Torokhov } 1528a7670d42SDmitry Torokhov EXPORT_SYMBOL_GPL(device_remove_groups); 1529de0ff00dSGreg Kroah-Hartman 153057b8ff07SDmitry Torokhov union device_attr_group_devres { 153157b8ff07SDmitry Torokhov const struct attribute_group *group; 153257b8ff07SDmitry Torokhov const struct attribute_group **groups; 153357b8ff07SDmitry Torokhov }; 153457b8ff07SDmitry Torokhov 153557b8ff07SDmitry Torokhov static int devm_attr_group_match(struct device *dev, void *res, void *data) 153657b8ff07SDmitry Torokhov { 153757b8ff07SDmitry Torokhov return ((union device_attr_group_devres *)res)->group == data; 153857b8ff07SDmitry Torokhov } 153957b8ff07SDmitry Torokhov 154057b8ff07SDmitry Torokhov static void devm_attr_group_remove(struct device *dev, void *res) 154157b8ff07SDmitry Torokhov { 154257b8ff07SDmitry Torokhov union device_attr_group_devres *devres = res; 154357b8ff07SDmitry Torokhov const struct attribute_group *group = devres->group; 154457b8ff07SDmitry Torokhov 154557b8ff07SDmitry Torokhov dev_dbg(dev, "%s: removing group %p\n", __func__, group); 154657b8ff07SDmitry Torokhov sysfs_remove_group(&dev->kobj, group); 154757b8ff07SDmitry Torokhov } 154857b8ff07SDmitry Torokhov 154957b8ff07SDmitry Torokhov static void devm_attr_groups_remove(struct device *dev, void *res) 155057b8ff07SDmitry Torokhov { 155157b8ff07SDmitry Torokhov union device_attr_group_devres *devres = res; 155257b8ff07SDmitry Torokhov const struct attribute_group **groups = devres->groups; 155357b8ff07SDmitry Torokhov 155457b8ff07SDmitry Torokhov dev_dbg(dev, "%s: removing groups %p\n", __func__, groups); 155557b8ff07SDmitry Torokhov sysfs_remove_groups(&dev->kobj, groups); 155657b8ff07SDmitry Torokhov } 155757b8ff07SDmitry Torokhov 155857b8ff07SDmitry Torokhov /** 155957b8ff07SDmitry Torokhov * devm_device_add_group - given a device, create a managed attribute group 156057b8ff07SDmitry Torokhov * @dev: The device to create the group for 156157b8ff07SDmitry Torokhov * @grp: The attribute group to create 156257b8ff07SDmitry Torokhov * 156357b8ff07SDmitry Torokhov * This function creates a group for the first time. It will explicitly 156457b8ff07SDmitry Torokhov * warn and error if any of the attribute files being created already exist. 156557b8ff07SDmitry Torokhov * 156657b8ff07SDmitry Torokhov * Returns 0 on success or error code on failure. 156757b8ff07SDmitry Torokhov */ 156857b8ff07SDmitry Torokhov int devm_device_add_group(struct device *dev, const struct attribute_group *grp) 156957b8ff07SDmitry Torokhov { 157057b8ff07SDmitry Torokhov union device_attr_group_devres *devres; 157157b8ff07SDmitry Torokhov int error; 157257b8ff07SDmitry Torokhov 157357b8ff07SDmitry Torokhov devres = devres_alloc(devm_attr_group_remove, 157457b8ff07SDmitry Torokhov sizeof(*devres), GFP_KERNEL); 157557b8ff07SDmitry Torokhov if (!devres) 157657b8ff07SDmitry Torokhov return -ENOMEM; 157757b8ff07SDmitry Torokhov 157857b8ff07SDmitry Torokhov error = sysfs_create_group(&dev->kobj, grp); 157957b8ff07SDmitry Torokhov if (error) { 158057b8ff07SDmitry Torokhov devres_free(devres); 158157b8ff07SDmitry Torokhov return error; 158257b8ff07SDmitry Torokhov } 158357b8ff07SDmitry Torokhov 158457b8ff07SDmitry Torokhov devres->group = grp; 158557b8ff07SDmitry Torokhov devres_add(dev, devres); 158657b8ff07SDmitry Torokhov return 0; 158757b8ff07SDmitry Torokhov } 158857b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_add_group); 158957b8ff07SDmitry Torokhov 159057b8ff07SDmitry Torokhov /** 159157b8ff07SDmitry Torokhov * devm_device_remove_group: remove a managed group from a device 159257b8ff07SDmitry Torokhov * @dev: device to remove the group from 159357b8ff07SDmitry Torokhov * @grp: group to remove 159457b8ff07SDmitry Torokhov * 159557b8ff07SDmitry Torokhov * This function removes a group of attributes from a device. The attributes 159657b8ff07SDmitry Torokhov * previously have to have been created for this group, otherwise it will fail. 159757b8ff07SDmitry Torokhov */ 159857b8ff07SDmitry Torokhov void devm_device_remove_group(struct device *dev, 159957b8ff07SDmitry Torokhov const struct attribute_group *grp) 160057b8ff07SDmitry Torokhov { 160157b8ff07SDmitry Torokhov WARN_ON(devres_release(dev, devm_attr_group_remove, 160257b8ff07SDmitry Torokhov devm_attr_group_match, 160357b8ff07SDmitry Torokhov /* cast away const */ (void *)grp)); 160457b8ff07SDmitry Torokhov } 160557b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_remove_group); 160657b8ff07SDmitry Torokhov 160757b8ff07SDmitry Torokhov /** 160857b8ff07SDmitry Torokhov * devm_device_add_groups - create a bunch of managed attribute groups 160957b8ff07SDmitry Torokhov * @dev: The device to create the group for 161057b8ff07SDmitry Torokhov * @groups: The attribute groups to create, NULL terminated 161157b8ff07SDmitry Torokhov * 161257b8ff07SDmitry Torokhov * This function creates a bunch of managed attribute groups. If an error 161357b8ff07SDmitry Torokhov * occurs when creating a group, all previously created groups will be 161457b8ff07SDmitry Torokhov * removed, unwinding everything back to the original state when this 161557b8ff07SDmitry Torokhov * function was called. It will explicitly warn and error if any of the 161657b8ff07SDmitry Torokhov * attribute files being created already exist. 161757b8ff07SDmitry Torokhov * 161857b8ff07SDmitry Torokhov * Returns 0 on success or error code from sysfs_create_group on failure. 161957b8ff07SDmitry Torokhov */ 162057b8ff07SDmitry Torokhov int devm_device_add_groups(struct device *dev, 162157b8ff07SDmitry Torokhov const struct attribute_group **groups) 162257b8ff07SDmitry Torokhov { 162357b8ff07SDmitry Torokhov union device_attr_group_devres *devres; 162457b8ff07SDmitry Torokhov int error; 162557b8ff07SDmitry Torokhov 162657b8ff07SDmitry Torokhov devres = devres_alloc(devm_attr_groups_remove, 162757b8ff07SDmitry Torokhov sizeof(*devres), GFP_KERNEL); 162857b8ff07SDmitry Torokhov if (!devres) 162957b8ff07SDmitry Torokhov return -ENOMEM; 163057b8ff07SDmitry Torokhov 163157b8ff07SDmitry Torokhov error = sysfs_create_groups(&dev->kobj, groups); 163257b8ff07SDmitry Torokhov if (error) { 163357b8ff07SDmitry Torokhov devres_free(devres); 163457b8ff07SDmitry Torokhov return error; 163557b8ff07SDmitry Torokhov } 163657b8ff07SDmitry Torokhov 163757b8ff07SDmitry Torokhov devres->groups = groups; 163857b8ff07SDmitry Torokhov devres_add(dev, devres); 163957b8ff07SDmitry Torokhov return 0; 164057b8ff07SDmitry Torokhov } 164157b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_add_groups); 164257b8ff07SDmitry Torokhov 164357b8ff07SDmitry Torokhov /** 164457b8ff07SDmitry Torokhov * devm_device_remove_groups - remove a list of managed groups 164557b8ff07SDmitry Torokhov * 164657b8ff07SDmitry Torokhov * @dev: The device for the groups to be removed from 164757b8ff07SDmitry Torokhov * @groups: NULL terminated list of groups to be removed 164857b8ff07SDmitry Torokhov * 164957b8ff07SDmitry Torokhov * If groups is not NULL, remove the specified groups from the device. 165057b8ff07SDmitry Torokhov */ 165157b8ff07SDmitry Torokhov void devm_device_remove_groups(struct device *dev, 165257b8ff07SDmitry Torokhov const struct attribute_group **groups) 165357b8ff07SDmitry Torokhov { 165457b8ff07SDmitry Torokhov WARN_ON(devres_release(dev, devm_attr_groups_remove, 165557b8ff07SDmitry Torokhov devm_attr_group_match, 165657b8ff07SDmitry Torokhov /* cast away const */ (void *)groups)); 165757b8ff07SDmitry Torokhov } 165857b8ff07SDmitry Torokhov EXPORT_SYMBOL_GPL(devm_device_remove_groups); 16591da177e4SLinus Torvalds 16602620efefSGreg Kroah-Hartman static int device_add_attrs(struct device *dev) 16612620efefSGreg Kroah-Hartman { 16622620efefSGreg Kroah-Hartman struct class *class = dev->class; 1663aed65af1SStephen Hemminger const struct device_type *type = dev->type; 1664621a1672SDmitry Torokhov int error; 16652620efefSGreg Kroah-Hartman 1666621a1672SDmitry Torokhov if (class) { 1667d05a6f96SGreg Kroah-Hartman error = device_add_groups(dev, class->dev_groups); 16682620efefSGreg Kroah-Hartman if (error) 1669621a1672SDmitry Torokhov return error; 1670f9f852dfSKay Sievers } 1671f9f852dfSKay Sievers 1672621a1672SDmitry Torokhov if (type) { 1673621a1672SDmitry Torokhov error = device_add_groups(dev, type->groups); 1674f9f852dfSKay Sievers if (error) 1675a6b01dedSGreg Kroah-Hartman goto err_remove_class_groups; 1676f9f852dfSKay Sievers } 1677621a1672SDmitry Torokhov 1678621a1672SDmitry Torokhov error = device_add_groups(dev, dev->groups); 1679f9f852dfSKay Sievers if (error) 1680621a1672SDmitry Torokhov goto err_remove_type_groups; 1681621a1672SDmitry Torokhov 16824f3549d7SRafael J. Wysocki if (device_supports_offline(dev) && !dev->offline_disabled) { 1683c5e064a6SGreg Kroah-Hartman error = device_create_file(dev, &dev_attr_online); 16844f3549d7SRafael J. Wysocki if (error) 1685ecfbf6fdSRafael J. Wysocki goto err_remove_dev_groups; 16864f3549d7SRafael J. Wysocki } 16874f3549d7SRafael J. Wysocki 1688621a1672SDmitry Torokhov return 0; 1689621a1672SDmitry Torokhov 1690ecfbf6fdSRafael J. Wysocki err_remove_dev_groups: 1691ecfbf6fdSRafael J. Wysocki device_remove_groups(dev, dev->groups); 1692621a1672SDmitry Torokhov err_remove_type_groups: 1693621a1672SDmitry Torokhov if (type) 1694621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 1695d05a6f96SGreg Kroah-Hartman err_remove_class_groups: 1696d05a6f96SGreg Kroah-Hartman if (class) 1697d05a6f96SGreg Kroah-Hartman device_remove_groups(dev, class->dev_groups); 1698f9f852dfSKay Sievers 16992620efefSGreg Kroah-Hartman return error; 17002620efefSGreg Kroah-Hartman } 17012620efefSGreg Kroah-Hartman 17022620efefSGreg Kroah-Hartman static void device_remove_attrs(struct device *dev) 17032620efefSGreg Kroah-Hartman { 17042620efefSGreg Kroah-Hartman struct class *class = dev->class; 1705aed65af1SStephen Hemminger const struct device_type *type = dev->type; 17062620efefSGreg Kroah-Hartman 1707c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_online); 1708621a1672SDmitry Torokhov device_remove_groups(dev, dev->groups); 1709f9f852dfSKay Sievers 1710621a1672SDmitry Torokhov if (type) 1711621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 1712621a1672SDmitry Torokhov 1713a6b01dedSGreg Kroah-Hartman if (class) 1714d05a6f96SGreg Kroah-Hartman device_remove_groups(dev, class->dev_groups); 1715c97415a7SStefan Achatz } 17162620efefSGreg Kroah-Hartman 1717c5e064a6SGreg Kroah-Hartman static ssize_t dev_show(struct device *dev, struct device_attribute *attr, 171823681e47SGreg Kroah-Hartman char *buf) 171923681e47SGreg Kroah-Hartman { 172023681e47SGreg Kroah-Hartman return print_dev_t(buf, dev->devt); 172123681e47SGreg Kroah-Hartman } 1722c5e064a6SGreg Kroah-Hartman static DEVICE_ATTR_RO(dev); 1723ad6a1e1cSTejun Heo 1724ca22e56dSKay Sievers /* /sys/devices/ */ 1725881c6cfdSGreg Kroah-Hartman struct kset *devices_kset; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /** 172852cdbdd4SGrygorii Strashko * devices_kset_move_before - Move device in the devices_kset's list. 172952cdbdd4SGrygorii Strashko * @deva: Device to move. 173052cdbdd4SGrygorii Strashko * @devb: Device @deva should come before. 173152cdbdd4SGrygorii Strashko */ 173252cdbdd4SGrygorii Strashko static void devices_kset_move_before(struct device *deva, struct device *devb) 173352cdbdd4SGrygorii Strashko { 173452cdbdd4SGrygorii Strashko if (!devices_kset) 173552cdbdd4SGrygorii Strashko return; 173652cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s before %s\n", 173752cdbdd4SGrygorii Strashko dev_name(deva), dev_name(devb)); 173852cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 173952cdbdd4SGrygorii Strashko list_move_tail(&deva->kobj.entry, &devb->kobj.entry); 174052cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 174152cdbdd4SGrygorii Strashko } 174252cdbdd4SGrygorii Strashko 174352cdbdd4SGrygorii Strashko /** 174452cdbdd4SGrygorii Strashko * devices_kset_move_after - Move device in the devices_kset's list. 174552cdbdd4SGrygorii Strashko * @deva: Device to move 174652cdbdd4SGrygorii Strashko * @devb: Device @deva should come after. 174752cdbdd4SGrygorii Strashko */ 174852cdbdd4SGrygorii Strashko static void devices_kset_move_after(struct device *deva, struct device *devb) 174952cdbdd4SGrygorii Strashko { 175052cdbdd4SGrygorii Strashko if (!devices_kset) 175152cdbdd4SGrygorii Strashko return; 175252cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s after %s\n", 175352cdbdd4SGrygorii Strashko dev_name(deva), dev_name(devb)); 175452cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 175552cdbdd4SGrygorii Strashko list_move(&deva->kobj.entry, &devb->kobj.entry); 175652cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 175752cdbdd4SGrygorii Strashko } 175852cdbdd4SGrygorii Strashko 175952cdbdd4SGrygorii Strashko /** 176052cdbdd4SGrygorii Strashko * devices_kset_move_last - move the device to the end of devices_kset's list. 176152cdbdd4SGrygorii Strashko * @dev: device to move 176252cdbdd4SGrygorii Strashko */ 176352cdbdd4SGrygorii Strashko void devices_kset_move_last(struct device *dev) 176452cdbdd4SGrygorii Strashko { 176552cdbdd4SGrygorii Strashko if (!devices_kset) 176652cdbdd4SGrygorii Strashko return; 176752cdbdd4SGrygorii Strashko pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev)); 176852cdbdd4SGrygorii Strashko spin_lock(&devices_kset->list_lock); 176952cdbdd4SGrygorii Strashko list_move_tail(&dev->kobj.entry, &devices_kset->list); 177052cdbdd4SGrygorii Strashko spin_unlock(&devices_kset->list_lock); 177152cdbdd4SGrygorii Strashko } 177252cdbdd4SGrygorii Strashko 177352cdbdd4SGrygorii Strashko /** 17741da177e4SLinus Torvalds * device_create_file - create sysfs attribute file for device. 17751da177e4SLinus Torvalds * @dev: device. 17761da177e4SLinus Torvalds * @attr: device attribute descriptor. 17771da177e4SLinus Torvalds */ 177826579ab7SPhil Carmody int device_create_file(struct device *dev, 177926579ab7SPhil Carmody const struct device_attribute *attr) 17801da177e4SLinus Torvalds { 17811da177e4SLinus Torvalds int error = 0; 17828f46baaaSFelipe Balbi 17838f46baaaSFelipe Balbi if (dev) { 17848f46baaaSFelipe Balbi WARN(((attr->attr.mode & S_IWUGO) && !attr->store), 178597521978Sdyoung@redhat.com "Attribute %s: write permission without 'store'\n", 178697521978Sdyoung@redhat.com attr->attr.name); 17878f46baaaSFelipe Balbi WARN(((attr->attr.mode & S_IRUGO) && !attr->show), 178897521978Sdyoung@redhat.com "Attribute %s: read permission without 'show'\n", 178997521978Sdyoung@redhat.com attr->attr.name); 17901da177e4SLinus Torvalds error = sysfs_create_file(&dev->kobj, &attr->attr); 17918f46baaaSFelipe Balbi } 17928f46baaaSFelipe Balbi 17931da177e4SLinus Torvalds return error; 17941da177e4SLinus Torvalds } 179586df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_create_file); 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds /** 17981da177e4SLinus Torvalds * device_remove_file - remove sysfs attribute file. 17991da177e4SLinus Torvalds * @dev: device. 18001da177e4SLinus Torvalds * @attr: device attribute descriptor. 18011da177e4SLinus Torvalds */ 180226579ab7SPhil Carmody void device_remove_file(struct device *dev, 180326579ab7SPhil Carmody const struct device_attribute *attr) 18041da177e4SLinus Torvalds { 18050c98b19fSCornelia Huck if (dev) 18061da177e4SLinus Torvalds sysfs_remove_file(&dev->kobj, &attr->attr); 18071da177e4SLinus Torvalds } 180886df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_remove_file); 18091da177e4SLinus Torvalds 18102589f188SGreg Kroah-Hartman /** 18116b0afc2aSTejun Heo * device_remove_file_self - remove sysfs attribute file from its own method. 18126b0afc2aSTejun Heo * @dev: device. 18136b0afc2aSTejun Heo * @attr: device attribute descriptor. 18146b0afc2aSTejun Heo * 18156b0afc2aSTejun Heo * See kernfs_remove_self() for details. 18166b0afc2aSTejun Heo */ 18176b0afc2aSTejun Heo bool device_remove_file_self(struct device *dev, 18186b0afc2aSTejun Heo const struct device_attribute *attr) 18196b0afc2aSTejun Heo { 18206b0afc2aSTejun Heo if (dev) 18216b0afc2aSTejun Heo return sysfs_remove_file_self(&dev->kobj, &attr->attr); 18226b0afc2aSTejun Heo else 18236b0afc2aSTejun Heo return false; 18246b0afc2aSTejun Heo } 18256b0afc2aSTejun Heo EXPORT_SYMBOL_GPL(device_remove_file_self); 18266b0afc2aSTejun Heo 18276b0afc2aSTejun Heo /** 18282589f188SGreg Kroah-Hartman * device_create_bin_file - create sysfs binary attribute file for device. 18292589f188SGreg Kroah-Hartman * @dev: device. 18302589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 18312589f188SGreg Kroah-Hartman */ 183266ecb92bSPhil Carmody int device_create_bin_file(struct device *dev, 183366ecb92bSPhil Carmody const struct bin_attribute *attr) 18342589f188SGreg Kroah-Hartman { 18352589f188SGreg Kroah-Hartman int error = -EINVAL; 18362589f188SGreg Kroah-Hartman if (dev) 18372589f188SGreg Kroah-Hartman error = sysfs_create_bin_file(&dev->kobj, attr); 18382589f188SGreg Kroah-Hartman return error; 18392589f188SGreg Kroah-Hartman } 18402589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_bin_file); 18412589f188SGreg Kroah-Hartman 18422589f188SGreg Kroah-Hartman /** 18432589f188SGreg Kroah-Hartman * device_remove_bin_file - remove sysfs binary attribute file 18442589f188SGreg Kroah-Hartman * @dev: device. 18452589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 18462589f188SGreg Kroah-Hartman */ 184766ecb92bSPhil Carmody void device_remove_bin_file(struct device *dev, 184866ecb92bSPhil Carmody const struct bin_attribute *attr) 18492589f188SGreg Kroah-Hartman { 18502589f188SGreg Kroah-Hartman if (dev) 18512589f188SGreg Kroah-Hartman sysfs_remove_bin_file(&dev->kobj, attr); 18522589f188SGreg Kroah-Hartman } 18532589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_remove_bin_file); 18542589f188SGreg Kroah-Hartman 185534bb61f9SJames Bottomley static void klist_children_get(struct klist_node *n) 185634bb61f9SJames Bottomley { 1857f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 1858f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 185934bb61f9SJames Bottomley 186034bb61f9SJames Bottomley get_device(dev); 186134bb61f9SJames Bottomley } 186234bb61f9SJames Bottomley 186334bb61f9SJames Bottomley static void klist_children_put(struct klist_node *n) 186434bb61f9SJames Bottomley { 1865f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 1866f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 186734bb61f9SJames Bottomley 186834bb61f9SJames Bottomley put_device(dev); 186934bb61f9SJames Bottomley } 187034bb61f9SJames Bottomley 18711da177e4SLinus Torvalds /** 18721da177e4SLinus Torvalds * device_initialize - init device structure. 18731da177e4SLinus Torvalds * @dev: device. 18741da177e4SLinus Torvalds * 18755739411aSCornelia Huck * This prepares the device for use by other layers by initializing 18765739411aSCornelia Huck * its fields. 18771da177e4SLinus Torvalds * It is the first half of device_register(), if called by 18785739411aSCornelia Huck * that function, though it can also be called separately, so one 18795739411aSCornelia Huck * may use @dev's fields. In particular, get_device()/put_device() 18805739411aSCornelia Huck * may be used for reference counting of @dev after calling this 18815739411aSCornelia Huck * function. 18825739411aSCornelia Huck * 1883b10d5efdSAlan Stern * All fields in @dev must be initialized by the caller to 0, except 1884b10d5efdSAlan Stern * for those explicitly set to some other value. The simplest 1885b10d5efdSAlan Stern * approach is to use kzalloc() to allocate the structure containing 1886b10d5efdSAlan Stern * @dev. 1887b10d5efdSAlan Stern * 18885739411aSCornelia Huck * NOTE: Use put_device() to give up your reference instead of freeing 18895739411aSCornelia Huck * @dev directly once you have called this function. 18901da177e4SLinus Torvalds */ 18911da177e4SLinus Torvalds void device_initialize(struct device *dev) 18921da177e4SLinus Torvalds { 1893881c6cfdSGreg Kroah-Hartman dev->kobj.kset = devices_kset; 1894f9cb074bSGreg Kroah-Hartman kobject_init(&dev->kobj, &device_ktype); 18951da177e4SLinus Torvalds INIT_LIST_HEAD(&dev->dma_pools); 18963142788bSThomas Gleixner mutex_init(&dev->mutex); 189787a30e1fSDan Williams #ifdef CONFIG_PROVE_LOCKING 189887a30e1fSDan Williams mutex_init(&dev->lockdep_mutex); 189987a30e1fSDan Williams #endif 19001704f47bSPeter Zijlstra lockdep_set_novalidate_class(&dev->mutex); 19019ac7849eSTejun Heo spin_lock_init(&dev->devres_lock); 19029ac7849eSTejun Heo INIT_LIST_HEAD(&dev->devres_head); 19033b98aeafSAlan Stern device_pm_init(dev); 190487348136SChristoph Hellwig set_dev_node(dev, -1); 19054a7cc831SJiang Liu #ifdef CONFIG_GENERIC_MSI_IRQ 19064a7cc831SJiang Liu INIT_LIST_HEAD(&dev->msi_list); 19074a7cc831SJiang Liu #endif 19089ed98953SRafael J. Wysocki INIT_LIST_HEAD(&dev->links.consumers); 19099ed98953SRafael J. Wysocki INIT_LIST_HEAD(&dev->links.suppliers); 1910e2ae9bccSSaravana Kannan INIT_LIST_HEAD(&dev->links.needs_suppliers); 1911fc5a251dSSaravana Kannan INIT_LIST_HEAD(&dev->links.defer_sync); 19129ed98953SRafael J. Wysocki dev->links.status = DL_DEV_NO_DRIVER; 19131da177e4SLinus Torvalds } 191486df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_initialize); 19151da177e4SLinus Torvalds 1916d73ce004STejun Heo struct kobject *virtual_device_parent(struct device *dev) 1917f0ee61a6SGreg Kroah-Hartman { 1918f0ee61a6SGreg Kroah-Hartman static struct kobject *virtual_dir = NULL; 1919f0ee61a6SGreg Kroah-Hartman 1920f0ee61a6SGreg Kroah-Hartman if (!virtual_dir) 19214ff6abffSGreg Kroah-Hartman virtual_dir = kobject_create_and_add("virtual", 1922881c6cfdSGreg Kroah-Hartman &devices_kset->kobj); 1923f0ee61a6SGreg Kroah-Hartman 192486406245SKay Sievers return virtual_dir; 1925f0ee61a6SGreg Kroah-Hartman } 1926f0ee61a6SGreg Kroah-Hartman 1927bc451f20SEric W. Biederman struct class_dir { 1928bc451f20SEric W. Biederman struct kobject kobj; 1929bc451f20SEric W. Biederman struct class *class; 1930bc451f20SEric W. Biederman }; 1931bc451f20SEric W. Biederman 1932bc451f20SEric W. Biederman #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) 1933bc451f20SEric W. Biederman 1934bc451f20SEric W. Biederman static void class_dir_release(struct kobject *kobj) 1935bc451f20SEric W. Biederman { 1936bc451f20SEric W. Biederman struct class_dir *dir = to_class_dir(kobj); 1937bc451f20SEric W. Biederman kfree(dir); 1938bc451f20SEric W. Biederman } 1939bc451f20SEric W. Biederman 1940bc451f20SEric W. Biederman static const 1941bc451f20SEric W. Biederman struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) 1942bc451f20SEric W. Biederman { 1943bc451f20SEric W. Biederman struct class_dir *dir = to_class_dir(kobj); 1944bc451f20SEric W. Biederman return dir->class->ns_type; 1945bc451f20SEric W. Biederman } 1946bc451f20SEric W. Biederman 1947bc451f20SEric W. Biederman static struct kobj_type class_dir_ktype = { 1948bc451f20SEric W. Biederman .release = class_dir_release, 1949bc451f20SEric W. Biederman .sysfs_ops = &kobj_sysfs_ops, 1950bc451f20SEric W. Biederman .child_ns_type = class_dir_child_ns_type 1951bc451f20SEric W. Biederman }; 1952bc451f20SEric W. Biederman 1953bc451f20SEric W. Biederman static struct kobject * 1954bc451f20SEric W. Biederman class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) 1955bc451f20SEric W. Biederman { 1956bc451f20SEric W. Biederman struct class_dir *dir; 1957bc451f20SEric W. Biederman int retval; 1958bc451f20SEric W. Biederman 1959bc451f20SEric W. Biederman dir = kzalloc(sizeof(*dir), GFP_KERNEL); 1960bc451f20SEric W. Biederman if (!dir) 196184d0c27dSTetsuo Handa return ERR_PTR(-ENOMEM); 1962bc451f20SEric W. Biederman 1963bc451f20SEric W. Biederman dir->class = class; 1964bc451f20SEric W. Biederman kobject_init(&dir->kobj, &class_dir_ktype); 1965bc451f20SEric W. Biederman 19666b6e39a6SKay Sievers dir->kobj.kset = &class->p->glue_dirs; 1967bc451f20SEric W. Biederman 1968bc451f20SEric W. Biederman retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); 1969bc451f20SEric W. Biederman if (retval < 0) { 1970bc451f20SEric W. Biederman kobject_put(&dir->kobj); 197184d0c27dSTetsuo Handa return ERR_PTR(retval); 1972bc451f20SEric W. Biederman } 1973bc451f20SEric W. Biederman return &dir->kobj; 1974bc451f20SEric W. Biederman } 1975bc451f20SEric W. Biederman 1976e4a60d13SYijing Wang static DEFINE_MUTEX(gdp_mutex); 1977bc451f20SEric W. Biederman 1978c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 1979c744aeaeSCornelia Huck struct device *parent) 198040fa5422SGreg Kroah-Hartman { 198186406245SKay Sievers if (dev->class) { 198286406245SKay Sievers struct kobject *kobj = NULL; 198386406245SKay Sievers struct kobject *parent_kobj; 198486406245SKay Sievers struct kobject *k; 198586406245SKay Sievers 1986ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 198739aba963SKay Sievers /* block disks show up in /sys/block */ 1988e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) { 198939aba963SKay Sievers if (parent && parent->class == &block_class) 199039aba963SKay Sievers return &parent->kobj; 19916b6e39a6SKay Sievers return &block_class.p->subsys.kobj; 199239aba963SKay Sievers } 1993ead454feSRandy Dunlap #endif 1994e52eec13SAndi Kleen 199586406245SKay Sievers /* 199686406245SKay Sievers * If we have no parent, we live in "virtual". 19970f4dafc0SKay Sievers * Class-devices with a non class-device as parent, live 19980f4dafc0SKay Sievers * in a "glue" directory to prevent namespace collisions. 199986406245SKay Sievers */ 200086406245SKay Sievers if (parent == NULL) 200186406245SKay Sievers parent_kobj = virtual_device_parent(dev); 200224b1442dSEric W. Biederman else if (parent->class && !dev->class->ns_type) 200386406245SKay Sievers return &parent->kobj; 200486406245SKay Sievers else 200586406245SKay Sievers parent_kobj = &parent->kobj; 200686406245SKay Sievers 200777d3d7c1STejun Heo mutex_lock(&gdp_mutex); 200877d3d7c1STejun Heo 200986406245SKay Sievers /* find our class-directory at the parent and reference it */ 20106b6e39a6SKay Sievers spin_lock(&dev->class->p->glue_dirs.list_lock); 20116b6e39a6SKay Sievers list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) 201286406245SKay Sievers if (k->parent == parent_kobj) { 201386406245SKay Sievers kobj = kobject_get(k); 201486406245SKay Sievers break; 201586406245SKay Sievers } 20166b6e39a6SKay Sievers spin_unlock(&dev->class->p->glue_dirs.list_lock); 201777d3d7c1STejun Heo if (kobj) { 201877d3d7c1STejun Heo mutex_unlock(&gdp_mutex); 201986406245SKay Sievers return kobj; 202077d3d7c1STejun Heo } 202186406245SKay Sievers 202286406245SKay Sievers /* or create a new class-directory at the parent device */ 2023bc451f20SEric W. Biederman k = class_dir_create_and_add(dev->class, parent_kobj); 20240f4dafc0SKay Sievers /* do not emit an uevent for this simple "glue" directory */ 202577d3d7c1STejun Heo mutex_unlock(&gdp_mutex); 202643968d2fSGreg Kroah-Hartman return k; 202786406245SKay Sievers } 202886406245SKay Sievers 2029ca22e56dSKay Sievers /* subsystems can specify a default root directory for their devices */ 2030ca22e56dSKay Sievers if (!parent && dev->bus && dev->bus->dev_root) 2031ca22e56dSKay Sievers return &dev->bus->dev_root->kobj; 2032ca22e56dSKay Sievers 203386406245SKay Sievers if (parent) 2034c744aeaeSCornelia Huck return &parent->kobj; 2035c744aeaeSCornelia Huck return NULL; 2036c744aeaeSCornelia Huck } 2037da231fd5SKay Sievers 2038cebf8fd1SMing Lei static inline bool live_in_glue_dir(struct kobject *kobj, 2039cebf8fd1SMing Lei struct device *dev) 2040cebf8fd1SMing Lei { 2041cebf8fd1SMing Lei if (!kobj || !dev->class || 2042cebf8fd1SMing Lei kobj->kset != &dev->class->p->glue_dirs) 2043cebf8fd1SMing Lei return false; 2044cebf8fd1SMing Lei return true; 2045cebf8fd1SMing Lei } 2046cebf8fd1SMing Lei 2047cebf8fd1SMing Lei static inline struct kobject *get_glue_dir(struct device *dev) 2048cebf8fd1SMing Lei { 2049cebf8fd1SMing Lei return dev->kobj.parent; 2050cebf8fd1SMing Lei } 2051cebf8fd1SMing Lei 2052cebf8fd1SMing Lei /* 2053cebf8fd1SMing Lei * make sure cleaning up dir as the last step, we need to make 2054cebf8fd1SMing Lei * sure .release handler of kobject is run with holding the 2055cebf8fd1SMing Lei * global lock 2056cebf8fd1SMing Lei */ 205763b6971aSCornelia Huck static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) 2058da231fd5SKay Sievers { 2059ac43432cSMuchun Song unsigned int ref; 2060ac43432cSMuchun Song 20610f4dafc0SKay Sievers /* see if we live in a "glue" directory */ 2062cebf8fd1SMing Lei if (!live_in_glue_dir(glue_dir, dev)) 2063da231fd5SKay Sievers return; 2064da231fd5SKay Sievers 2065e4a60d13SYijing Wang mutex_lock(&gdp_mutex); 2066ac43432cSMuchun Song /** 2067ac43432cSMuchun Song * There is a race condition between removing glue directory 2068ac43432cSMuchun Song * and adding a new device under the glue directory. 2069ac43432cSMuchun Song * 2070ac43432cSMuchun Song * CPU1: CPU2: 2071ac43432cSMuchun Song * 2072ac43432cSMuchun Song * device_add() 2073ac43432cSMuchun Song * get_device_parent() 2074ac43432cSMuchun Song * class_dir_create_and_add() 2075ac43432cSMuchun Song * kobject_add_internal() 2076ac43432cSMuchun Song * create_dir() // create glue_dir 2077ac43432cSMuchun Song * 2078ac43432cSMuchun Song * device_add() 2079ac43432cSMuchun Song * get_device_parent() 2080ac43432cSMuchun Song * kobject_get() // get glue_dir 2081ac43432cSMuchun Song * 2082ac43432cSMuchun Song * device_del() 2083ac43432cSMuchun Song * cleanup_glue_dir() 2084ac43432cSMuchun Song * kobject_del(glue_dir) 2085ac43432cSMuchun Song * 2086ac43432cSMuchun Song * kobject_add() 2087ac43432cSMuchun Song * kobject_add_internal() 2088ac43432cSMuchun Song * create_dir() // in glue_dir 2089ac43432cSMuchun Song * sysfs_create_dir_ns() 2090ac43432cSMuchun Song * kernfs_create_dir_ns(sd) 2091ac43432cSMuchun Song * 2092ac43432cSMuchun Song * sysfs_remove_dir() // glue_dir->sd=NULL 2093ac43432cSMuchun Song * sysfs_put() // free glue_dir->sd 2094ac43432cSMuchun Song * 2095ac43432cSMuchun Song * // sd is freed 2096ac43432cSMuchun Song * kernfs_new_node(sd) 2097ac43432cSMuchun Song * kernfs_get(glue_dir) 2098ac43432cSMuchun Song * kernfs_add_one() 2099ac43432cSMuchun Song * kernfs_put() 2100ac43432cSMuchun Song * 2101ac43432cSMuchun Song * Before CPU1 remove last child device under glue dir, if CPU2 add 2102ac43432cSMuchun Song * a new device under glue dir, the glue_dir kobject reference count 2103ac43432cSMuchun Song * will be increase to 2 in kobject_get(k). And CPU2 has been called 2104ac43432cSMuchun Song * kernfs_create_dir_ns(). Meanwhile, CPU1 call sysfs_remove_dir() 2105ac43432cSMuchun Song * and sysfs_put(). This result in glue_dir->sd is freed. 2106ac43432cSMuchun Song * 2107ac43432cSMuchun Song * Then the CPU2 will see a stale "empty" but still potentially used 2108ac43432cSMuchun Song * glue dir around in kernfs_new_node(). 2109ac43432cSMuchun Song * 2110ac43432cSMuchun Song * In order to avoid this happening, we also should make sure that 2111ac43432cSMuchun Song * kernfs_node for glue_dir is released in CPU1 only when refcount 2112ac43432cSMuchun Song * for glue_dir kobj is 1. 2113ac43432cSMuchun Song */ 2114ac43432cSMuchun Song ref = kref_read(&glue_dir->kref); 2115ac43432cSMuchun Song if (!kobject_has_children(glue_dir) && !--ref) 2116726e4109SBenjamin Herrenschmidt kobject_del(glue_dir); 21170f4dafc0SKay Sievers kobject_put(glue_dir); 2118e4a60d13SYijing Wang mutex_unlock(&gdp_mutex); 2119da231fd5SKay Sievers } 212063b6971aSCornelia Huck 21212ee97cafSCornelia Huck static int device_add_class_symlinks(struct device *dev) 21222ee97cafSCornelia Huck { 21235590f319SBenjamin Herrenschmidt struct device_node *of_node = dev_of_node(dev); 21242ee97cafSCornelia Huck int error; 21252ee97cafSCornelia Huck 21265590f319SBenjamin Herrenschmidt if (of_node) { 21270c3c234bSRob Herring error = sysfs_create_link(&dev->kobj, of_node_kobj(of_node), "of_node"); 21285590f319SBenjamin Herrenschmidt if (error) 21295590f319SBenjamin Herrenschmidt dev_warn(dev, "Error %d creating of_node link\n",error); 21305590f319SBenjamin Herrenschmidt /* An error here doesn't warrant bringing down the device */ 21315590f319SBenjamin Herrenschmidt } 21325590f319SBenjamin Herrenschmidt 21332ee97cafSCornelia Huck if (!dev->class) 21342ee97cafSCornelia Huck return 0; 2135da231fd5SKay Sievers 21361fbfee6cSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, 21376b6e39a6SKay Sievers &dev->class->p->subsys.kobj, 21382ee97cafSCornelia Huck "subsystem"); 21392ee97cafSCornelia Huck if (error) 21405590f319SBenjamin Herrenschmidt goto out_devnode; 2141da231fd5SKay Sievers 21424e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) { 21434f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, 21444f01a757SDmitry Torokhov "device"); 21454f01a757SDmitry Torokhov if (error) 214639aba963SKay Sievers goto out_subsys; 21472ee97cafSCornelia Huck } 214839aba963SKay Sievers 2149ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 215039aba963SKay Sievers /* /sys/block has directories and does not need symlinks */ 2151e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) 215239aba963SKay Sievers return 0; 2153ead454feSRandy Dunlap #endif 215439aba963SKay Sievers 215539aba963SKay Sievers /* link in the class directory pointing to the device */ 21566b6e39a6SKay Sievers error = sysfs_create_link(&dev->class->p->subsys.kobj, 215739aba963SKay Sievers &dev->kobj, dev_name(dev)); 215839aba963SKay Sievers if (error) 215939aba963SKay Sievers goto out_device; 216039aba963SKay Sievers 21612ee97cafSCornelia Huck return 0; 21622ee97cafSCornelia Huck 216339aba963SKay Sievers out_device: 216439aba963SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 2165da231fd5SKay Sievers 21662ee97cafSCornelia Huck out_subsys: 21672ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 21685590f319SBenjamin Herrenschmidt out_devnode: 21695590f319SBenjamin Herrenschmidt sysfs_remove_link(&dev->kobj, "of_node"); 21702ee97cafSCornelia Huck return error; 21712ee97cafSCornelia Huck } 21722ee97cafSCornelia Huck 21732ee97cafSCornelia Huck static void device_remove_class_symlinks(struct device *dev) 21742ee97cafSCornelia Huck { 21755590f319SBenjamin Herrenschmidt if (dev_of_node(dev)) 21765590f319SBenjamin Herrenschmidt sysfs_remove_link(&dev->kobj, "of_node"); 21775590f319SBenjamin Herrenschmidt 21782ee97cafSCornelia Huck if (!dev->class) 21792ee97cafSCornelia Huck return; 2180da231fd5SKay Sievers 21814e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) 2182da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 21832ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 2184ead454feSRandy Dunlap #ifdef CONFIG_BLOCK 2185e52eec13SAndi Kleen if (sysfs_deprecated && dev->class == &block_class) 218639aba963SKay Sievers return; 2187ead454feSRandy Dunlap #endif 21886b6e39a6SKay Sievers sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); 21892ee97cafSCornelia Huck } 21902ee97cafSCornelia Huck 21911da177e4SLinus Torvalds /** 2192413c239fSStephen Rothwell * dev_set_name - set a device name 2193413c239fSStephen Rothwell * @dev: device 219446232366SRandy Dunlap * @fmt: format string for the device's name 2195413c239fSStephen Rothwell */ 2196413c239fSStephen Rothwell int dev_set_name(struct device *dev, const char *fmt, ...) 2197413c239fSStephen Rothwell { 2198413c239fSStephen Rothwell va_list vargs; 21991fa5ae85SKay Sievers int err; 2200413c239fSStephen Rothwell 2201413c239fSStephen Rothwell va_start(vargs, fmt); 22021fa5ae85SKay Sievers err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); 2203413c239fSStephen Rothwell va_end(vargs); 22041fa5ae85SKay Sievers return err; 2205413c239fSStephen Rothwell } 2206413c239fSStephen Rothwell EXPORT_SYMBOL_GPL(dev_set_name); 2207413c239fSStephen Rothwell 2208413c239fSStephen Rothwell /** 2209e105b8bfSDan Williams * device_to_dev_kobj - select a /sys/dev/ directory for the device 2210e105b8bfSDan Williams * @dev: device 2211e105b8bfSDan Williams * 2212e105b8bfSDan Williams * By default we select char/ for new entries. Setting class->dev_obj 2213e105b8bfSDan Williams * to NULL prevents an entry from being created. class->dev_kobj must 2214e105b8bfSDan Williams * be set (or cleared) before any devices are registered to the class 2215e105b8bfSDan Williams * otherwise device_create_sys_dev_entry() and 22160d4e293cSPeter Korsgaard * device_remove_sys_dev_entry() will disagree about the presence of 22170d4e293cSPeter Korsgaard * the link. 2218e105b8bfSDan Williams */ 2219e105b8bfSDan Williams static struct kobject *device_to_dev_kobj(struct device *dev) 2220e105b8bfSDan Williams { 2221e105b8bfSDan Williams struct kobject *kobj; 2222e105b8bfSDan Williams 2223e105b8bfSDan Williams if (dev->class) 2224e105b8bfSDan Williams kobj = dev->class->dev_kobj; 2225e105b8bfSDan Williams else 2226e105b8bfSDan Williams kobj = sysfs_dev_char_kobj; 2227e105b8bfSDan Williams 2228e105b8bfSDan Williams return kobj; 2229e105b8bfSDan Williams } 2230e105b8bfSDan Williams 2231e105b8bfSDan Williams static int device_create_sys_dev_entry(struct device *dev) 2232e105b8bfSDan Williams { 2233e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 2234e105b8bfSDan Williams int error = 0; 2235e105b8bfSDan Williams char devt_str[15]; 2236e105b8bfSDan Williams 2237e105b8bfSDan Williams if (kobj) { 2238e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 2239e105b8bfSDan Williams error = sysfs_create_link(kobj, &dev->kobj, devt_str); 2240e105b8bfSDan Williams } 2241e105b8bfSDan Williams 2242e105b8bfSDan Williams return error; 2243e105b8bfSDan Williams } 2244e105b8bfSDan Williams 2245e105b8bfSDan Williams static void device_remove_sys_dev_entry(struct device *dev) 2246e105b8bfSDan Williams { 2247e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 2248e105b8bfSDan Williams char devt_str[15]; 2249e105b8bfSDan Williams 2250e105b8bfSDan Williams if (kobj) { 2251e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 2252e105b8bfSDan Williams sysfs_remove_link(kobj, devt_str); 2253e105b8bfSDan Williams } 2254e105b8bfSDan Williams } 2255e105b8bfSDan Williams 225646d3a037SShaokun Zhang static int device_private_init(struct device *dev) 2257b4028437SGreg Kroah-Hartman { 2258b4028437SGreg Kroah-Hartman dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); 2259b4028437SGreg Kroah-Hartman if (!dev->p) 2260b4028437SGreg Kroah-Hartman return -ENOMEM; 2261b4028437SGreg Kroah-Hartman dev->p->device = dev; 2262b4028437SGreg Kroah-Hartman klist_init(&dev->p->klist_children, klist_children_get, 2263b4028437SGreg Kroah-Hartman klist_children_put); 2264ef8a3fd6SGreg Kroah-Hartman INIT_LIST_HEAD(&dev->p->deferred_probe); 2265b4028437SGreg Kroah-Hartman return 0; 2266b4028437SGreg Kroah-Hartman } 2267b4028437SGreg Kroah-Hartman 2268e105b8bfSDan Williams /** 22691da177e4SLinus Torvalds * device_add - add device to device hierarchy. 22701da177e4SLinus Torvalds * @dev: device. 22711da177e4SLinus Torvalds * 22721da177e4SLinus Torvalds * This is part 2 of device_register(), though may be called 22731da177e4SLinus Torvalds * separately _iff_ device_initialize() has been called separately. 22741da177e4SLinus Torvalds * 22755739411aSCornelia Huck * This adds @dev to the kobject hierarchy via kobject_add(), adds it 22761da177e4SLinus Torvalds * to the global and sibling lists for the device, then 22771da177e4SLinus Torvalds * adds it to the other relevant subsystems of the driver model. 22785739411aSCornelia Huck * 2279b10d5efdSAlan Stern * Do not call this routine or device_register() more than once for 2280b10d5efdSAlan Stern * any device structure. The driver model core is not designed to work 2281b10d5efdSAlan Stern * with devices that get unregistered and then spring back to life. 2282b10d5efdSAlan Stern * (Among other things, it's very hard to guarantee that all references 2283b10d5efdSAlan Stern * to the previous incarnation of @dev have been dropped.) Allocate 2284b10d5efdSAlan Stern * and register a fresh new struct device instead. 2285b10d5efdSAlan Stern * 22865739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 22875739411aSCornelia Huck * if it returned an error! Always use put_device() to give up your 22885739411aSCornelia Huck * reference instead. 2289affada72SBorislav Petkov * 2290affada72SBorislav Petkov * Rule of thumb is: if device_add() succeeds, you should call 2291affada72SBorislav Petkov * device_del() when you want to get rid of it. If device_add() has 2292affada72SBorislav Petkov * *not* succeeded, use *only* put_device() to drop the reference 2293affada72SBorislav Petkov * count. 22941da177e4SLinus Torvalds */ 22951da177e4SLinus Torvalds int device_add(struct device *dev) 22961da177e4SLinus Torvalds { 229735dbf4efSViresh Kumar struct device *parent; 2298ca22e56dSKay Sievers struct kobject *kobj; 2299c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 2300c906a48aSGreg Kroah-Hartman int error = -EINVAL; 2301cebf8fd1SMing Lei struct kobject *glue_dir = NULL; 2302775b64d2SRafael J. Wysocki 23031da177e4SLinus Torvalds dev = get_device(dev); 2304c906a48aSGreg Kroah-Hartman if (!dev) 2305c906a48aSGreg Kroah-Hartman goto done; 2306c906a48aSGreg Kroah-Hartman 2307fb069a5dSGreg Kroah-Hartman if (!dev->p) { 2308b4028437SGreg Kroah-Hartman error = device_private_init(dev); 2309b4028437SGreg Kroah-Hartman if (error) 2310fb069a5dSGreg Kroah-Hartman goto done; 2311fb069a5dSGreg Kroah-Hartman } 2312fb069a5dSGreg Kroah-Hartman 23131fa5ae85SKay Sievers /* 23141fa5ae85SKay Sievers * for statically allocated devices, which should all be converted 23151fa5ae85SKay Sievers * some day, we need to initialize the name. We prevent reading back 23161fa5ae85SKay Sievers * the name, and force the use of dev_name() 23171fa5ae85SKay Sievers */ 23181fa5ae85SKay Sievers if (dev->init_name) { 2319acc0e90fSGreg Kroah-Hartman dev_set_name(dev, "%s", dev->init_name); 23201fa5ae85SKay Sievers dev->init_name = NULL; 23211fa5ae85SKay Sievers } 2322c906a48aSGreg Kroah-Hartman 2323ca22e56dSKay Sievers /* subsystems can specify simple device enumeration */ 2324ca22e56dSKay Sievers if (!dev_name(dev) && dev->bus && dev->bus->dev_name) 2325ca22e56dSKay Sievers dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); 2326ca22e56dSKay Sievers 2327e6309e75SThomas Gleixner if (!dev_name(dev)) { 2328e6309e75SThomas Gleixner error = -EINVAL; 23295c8563d7SKay Sievers goto name_error; 2330e6309e75SThomas Gleixner } 23311da177e4SLinus Torvalds 23321e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 2333c205ef48SGreg Kroah-Hartman 23341da177e4SLinus Torvalds parent = get_device(dev->parent); 2335ca22e56dSKay Sievers kobj = get_device_parent(dev, parent); 233684d0c27dSTetsuo Handa if (IS_ERR(kobj)) { 233784d0c27dSTetsuo Handa error = PTR_ERR(kobj); 233884d0c27dSTetsuo Handa goto parent_error; 233984d0c27dSTetsuo Handa } 2340ca22e56dSKay Sievers if (kobj) 2341ca22e56dSKay Sievers dev->kobj.parent = kobj; 23421da177e4SLinus Torvalds 23430d358f22SYinghai Lu /* use parent numa_node */ 234456f2de81SZhen Lei if (parent && (dev_to_node(dev) == NUMA_NO_NODE)) 23450d358f22SYinghai Lu set_dev_node(dev, dev_to_node(parent)); 23460d358f22SYinghai Lu 23471da177e4SLinus Torvalds /* first, register with generic layer. */ 23488a577ffcSKay Sievers /* we require the name to be set before, and pass NULL */ 23498a577ffcSKay Sievers error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); 2350cebf8fd1SMing Lei if (error) { 2351cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 23521da177e4SLinus Torvalds goto Error; 2353cebf8fd1SMing Lei } 2354a7fd6706SKay Sievers 235537022644SBrian Walsh /* notify platform of device entry */ 235607de0e86SHeikki Krogerus error = device_platform_notify(dev, KOBJ_ADD); 235707de0e86SHeikki Krogerus if (error) 235807de0e86SHeikki Krogerus goto platform_error; 235937022644SBrian Walsh 2360c5e064a6SGreg Kroah-Hartman error = device_create_file(dev, &dev_attr_uevent); 2361a306eea4SCornelia Huck if (error) 2362a306eea4SCornelia Huck goto attrError; 2363a7fd6706SKay Sievers 23642ee97cafSCornelia Huck error = device_add_class_symlinks(dev); 23652ee97cafSCornelia Huck if (error) 23662ee97cafSCornelia Huck goto SymlinkError; 2367dc0afa83SCornelia Huck error = device_add_attrs(dev); 2368dc0afa83SCornelia Huck if (error) 23692620efefSGreg Kroah-Hartman goto AttrsError; 2370dc0afa83SCornelia Huck error = bus_add_device(dev); 2371dc0afa83SCornelia Huck if (error) 23721da177e4SLinus Torvalds goto BusError; 23733b98aeafSAlan Stern error = dpm_sysfs_add(dev); 237457eee3d2SRafael J. Wysocki if (error) 23753b98aeafSAlan Stern goto DPMError; 23763b98aeafSAlan Stern device_pm_add(dev); 2377ec0676eeSAlan Stern 23780cd75047SSergey Klyaus if (MAJOR(dev->devt)) { 23790cd75047SSergey Klyaus error = device_create_file(dev, &dev_attr_dev); 23800cd75047SSergey Klyaus if (error) 23810cd75047SSergey Klyaus goto DevAttrError; 23820cd75047SSergey Klyaus 23830cd75047SSergey Klyaus error = device_create_sys_dev_entry(dev); 23840cd75047SSergey Klyaus if (error) 23850cd75047SSergey Klyaus goto SysEntryError; 23860cd75047SSergey Klyaus 23870cd75047SSergey Klyaus devtmpfs_create_node(dev); 23880cd75047SSergey Klyaus } 23890cd75047SSergey Klyaus 2390ec0676eeSAlan Stern /* Notify clients of device addition. This call must come 2391268863f4Smajianpeng * after dpm_sysfs_add() and before kobject_uevent(). 2392ec0676eeSAlan Stern */ 2393ec0676eeSAlan Stern if (dev->bus) 2394ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 2395ec0676eeSAlan Stern BUS_NOTIFY_ADD_DEVICE, dev); 2396ec0676eeSAlan Stern 239753877d06SKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 2398372a67c0SSaravana Kannan 2399372a67c0SSaravana Kannan if (dev->fwnode && !dev->fwnode->dev) 2400372a67c0SSaravana Kannan dev->fwnode->dev = dev; 2401372a67c0SSaravana Kannan 2402e2ae9bccSSaravana Kannan /* 2403e2ae9bccSSaravana Kannan * Check if any of the other devices (consumers) have been waiting for 2404e2ae9bccSSaravana Kannan * this device (supplier) to be added so that they can create a device 2405e2ae9bccSSaravana Kannan * link to it. 2406e2ae9bccSSaravana Kannan * 2407e2ae9bccSSaravana Kannan * This needs to happen after device_pm_add() because device_link_add() 2408e2ae9bccSSaravana Kannan * requires the supplier be registered before it's called. 2409e2ae9bccSSaravana Kannan * 2410e2ae9bccSSaravana Kannan * But this also needs to happe before bus_probe_device() to make sure 2411e2ae9bccSSaravana Kannan * waiting consumers can link to it before the driver is bound to the 2412e2ae9bccSSaravana Kannan * device and the driver sync_state callback is called for this device. 2413e2ae9bccSSaravana Kannan */ 2414e2ae9bccSSaravana Kannan device_link_add_missing_supplier_links(); 2415e2ae9bccSSaravana Kannan 2416e2ae9bccSSaravana Kannan if (fwnode_has_op(dev->fwnode, add_links) 2417e2ae9bccSSaravana Kannan && fwnode_call_int_op(dev->fwnode, add_links, dev)) 2418bcbbcfd5SSaravana Kannan device_link_wait_for_mandatory_supplier(dev, true); 2419e2ae9bccSSaravana Kannan 24202023c610SAlan Stern bus_probe_device(dev); 24211da177e4SLinus Torvalds if (parent) 2422f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 2423f791b8c8SGreg Kroah-Hartman &parent->p->klist_children); 24241da177e4SLinus Torvalds 24255d9fd169SGreg Kroah-Hartman if (dev->class) { 2426ca22e56dSKay Sievers mutex_lock(&dev->class->p->mutex); 2427c47ed219SGreg Kroah-Hartman /* tie the class to the device */ 2428570d0200SWei Yang klist_add_tail(&dev->p->knode_class, 24296b6e39a6SKay Sievers &dev->class->p->klist_devices); 2430c47ed219SGreg Kroah-Hartman 2431c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is here */ 2432184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 2433ca22e56dSKay Sievers &dev->class->p->interfaces, node) 2434c47ed219SGreg Kroah-Hartman if (class_intf->add_dev) 2435c47ed219SGreg Kroah-Hartman class_intf->add_dev(dev, class_intf); 2436ca22e56dSKay Sievers mutex_unlock(&dev->class->p->mutex); 24375d9fd169SGreg Kroah-Hartman } 2438c906a48aSGreg Kroah-Hartman done: 24391da177e4SLinus Torvalds put_device(dev); 24401da177e4SLinus Torvalds return error; 24410cd75047SSergey Klyaus SysEntryError: 24420cd75047SSergey Klyaus if (MAJOR(dev->devt)) 24430cd75047SSergey Klyaus device_remove_file(dev, &dev_attr_dev); 24440cd75047SSergey Klyaus DevAttrError: 24450cd75047SSergey Klyaus device_pm_remove(dev); 24460cd75047SSergey Klyaus dpm_sysfs_remove(dev); 24473b98aeafSAlan Stern DPMError: 244857eee3d2SRafael J. Wysocki bus_remove_device(dev); 244957eee3d2SRafael J. Wysocki BusError: 24502620efefSGreg Kroah-Hartman device_remove_attrs(dev); 24512620efefSGreg Kroah-Hartman AttrsError: 24522ee97cafSCornelia Huck device_remove_class_symlinks(dev); 24532ee97cafSCornelia Huck SymlinkError: 2454c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_uevent); 245523681e47SGreg Kroah-Hartman attrError: 245607de0e86SHeikki Krogerus device_platform_notify(dev, KOBJ_REMOVE); 245707de0e86SHeikki Krogerus platform_error: 2458312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 2459cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 24601da177e4SLinus Torvalds kobject_del(&dev->kobj); 24611da177e4SLinus Torvalds Error: 2462cebf8fd1SMing Lei cleanup_glue_dir(dev, glue_dir); 246384d0c27dSTetsuo Handa parent_error: 24641da177e4SLinus Torvalds put_device(parent); 24655c8563d7SKay Sievers name_error: 24665c8563d7SKay Sievers kfree(dev->p); 24675c8563d7SKay Sievers dev->p = NULL; 2468c906a48aSGreg Kroah-Hartman goto done; 24691da177e4SLinus Torvalds } 247086df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_add); 24711da177e4SLinus Torvalds 24721da177e4SLinus Torvalds /** 24731da177e4SLinus Torvalds * device_register - register a device with the system. 24741da177e4SLinus Torvalds * @dev: pointer to the device structure 24751da177e4SLinus Torvalds * 24761da177e4SLinus Torvalds * This happens in two clean steps - initialize the device 24771da177e4SLinus Torvalds * and add it to the system. The two steps can be called 24781da177e4SLinus Torvalds * separately, but this is the easiest and most common. 24791da177e4SLinus Torvalds * I.e. you should only call the two helpers separately if 24801da177e4SLinus Torvalds * have a clearly defined need to use and refcount the device 24811da177e4SLinus Torvalds * before it is added to the hierarchy. 24825739411aSCornelia Huck * 2483b10d5efdSAlan Stern * For more information, see the kerneldoc for device_initialize() 2484b10d5efdSAlan Stern * and device_add(). 2485b10d5efdSAlan Stern * 24865739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 24875739411aSCornelia Huck * if it returned an error! Always use put_device() to give up the 24885739411aSCornelia Huck * reference initialized in this function instead. 24891da177e4SLinus Torvalds */ 24901da177e4SLinus Torvalds int device_register(struct device *dev) 24911da177e4SLinus Torvalds { 24921da177e4SLinus Torvalds device_initialize(dev); 24931da177e4SLinus Torvalds return device_add(dev); 24941da177e4SLinus Torvalds } 249586df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_register); 24961da177e4SLinus Torvalds 24971da177e4SLinus Torvalds /** 24981da177e4SLinus Torvalds * get_device - increment reference count for device. 24991da177e4SLinus Torvalds * @dev: device. 25001da177e4SLinus Torvalds * 25011da177e4SLinus Torvalds * This simply forwards the call to kobject_get(), though 25021da177e4SLinus Torvalds * we do take care to provide for the case that we get a NULL 25031da177e4SLinus Torvalds * pointer passed in. 25041da177e4SLinus Torvalds */ 25051da177e4SLinus Torvalds struct device *get_device(struct device *dev) 25061da177e4SLinus Torvalds { 2507b0d1f807SLars-Peter Clausen return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; 25081da177e4SLinus Torvalds } 250986df2687SDavid Graham White EXPORT_SYMBOL_GPL(get_device); 25101da177e4SLinus Torvalds 25111da177e4SLinus Torvalds /** 25121da177e4SLinus Torvalds * put_device - decrement reference count. 25131da177e4SLinus Torvalds * @dev: device in question. 25141da177e4SLinus Torvalds */ 25151da177e4SLinus Torvalds void put_device(struct device *dev) 25161da177e4SLinus Torvalds { 2517edfaa7c3SKay Sievers /* might_sleep(); */ 25181da177e4SLinus Torvalds if (dev) 25191da177e4SLinus Torvalds kobject_put(&dev->kobj); 25201da177e4SLinus Torvalds } 252186df2687SDavid Graham White EXPORT_SYMBOL_GPL(put_device); 25221da177e4SLinus Torvalds 252300289cd8SDan Williams bool kill_device(struct device *dev) 252400289cd8SDan Williams { 252500289cd8SDan Williams /* 252600289cd8SDan Williams * Require the device lock and set the "dead" flag to guarantee that 252700289cd8SDan Williams * the update behavior is consistent with the other bitfields near 252800289cd8SDan Williams * it and that we cannot have an asynchronous probe routine trying 252900289cd8SDan Williams * to run while we are tearing out the bus/class/sysfs from 253000289cd8SDan Williams * underneath the device. 253100289cd8SDan Williams */ 253200289cd8SDan Williams lockdep_assert_held(&dev->mutex); 253300289cd8SDan Williams 253400289cd8SDan Williams if (dev->p->dead) 253500289cd8SDan Williams return false; 253600289cd8SDan Williams dev->p->dead = true; 253700289cd8SDan Williams return true; 253800289cd8SDan Williams } 253900289cd8SDan Williams EXPORT_SYMBOL_GPL(kill_device); 254000289cd8SDan Williams 25411da177e4SLinus Torvalds /** 25421da177e4SLinus Torvalds * device_del - delete device from system. 25431da177e4SLinus Torvalds * @dev: device. 25441da177e4SLinus Torvalds * 25451da177e4SLinus Torvalds * This is the first part of the device unregistration 25461da177e4SLinus Torvalds * sequence. This removes the device from the lists we control 25471da177e4SLinus Torvalds * from here, has it removed from the other driver model 25481da177e4SLinus Torvalds * subsystems it was added to in device_add(), and removes it 25491da177e4SLinus Torvalds * from the kobject hierarchy. 25501da177e4SLinus Torvalds * 25511da177e4SLinus Torvalds * NOTE: this should be called manually _iff_ device_add() was 25521da177e4SLinus Torvalds * also called manually. 25531da177e4SLinus Torvalds */ 25541da177e4SLinus Torvalds void device_del(struct device *dev) 25551da177e4SLinus Torvalds { 25561da177e4SLinus Torvalds struct device *parent = dev->parent; 2557cebf8fd1SMing Lei struct kobject *glue_dir = NULL; 2558c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 25591da177e4SLinus Torvalds 25603451a495SAlexander Duyck device_lock(dev); 256100289cd8SDan Williams kill_device(dev); 25623451a495SAlexander Duyck device_unlock(dev); 25633451a495SAlexander Duyck 2564372a67c0SSaravana Kannan if (dev->fwnode && dev->fwnode->dev == dev) 2565372a67c0SSaravana Kannan dev->fwnode->dev = NULL; 2566372a67c0SSaravana Kannan 2567ec0676eeSAlan Stern /* Notify clients of device removal. This call must come 2568ec0676eeSAlan Stern * before dpm_sysfs_remove(). 2569ec0676eeSAlan Stern */ 2570ec0676eeSAlan Stern if (dev->bus) 2571ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 2572ec0676eeSAlan Stern BUS_NOTIFY_DEL_DEVICE, dev); 25739ed98953SRafael J. Wysocki 25743b98aeafSAlan Stern dpm_sysfs_remove(dev); 25751da177e4SLinus Torvalds if (parent) 2576f791b8c8SGreg Kroah-Hartman klist_del(&dev->p->knode_parent); 2577e105b8bfSDan Williams if (MAJOR(dev->devt)) { 25782b2af54aSKay Sievers devtmpfs_delete_node(dev); 2579e105b8bfSDan Williams device_remove_sys_dev_entry(dev); 2580c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_dev); 2581e105b8bfSDan Williams } 2582b9d9c82bSKay Sievers if (dev->class) { 2583da231fd5SKay Sievers device_remove_class_symlinks(dev); 258499ef3ef8SKay Sievers 2585ca22e56dSKay Sievers mutex_lock(&dev->class->p->mutex); 2586c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is now gone */ 2587184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 2588ca22e56dSKay Sievers &dev->class->p->interfaces, node) 2589c47ed219SGreg Kroah-Hartman if (class_intf->remove_dev) 2590c47ed219SGreg Kroah-Hartman class_intf->remove_dev(dev, class_intf); 2591c47ed219SGreg Kroah-Hartman /* remove the device from the class list */ 2592570d0200SWei Yang klist_del(&dev->p->knode_class); 2593ca22e56dSKay Sievers mutex_unlock(&dev->class->p->mutex); 2594b9d9c82bSKay Sievers } 2595c5e064a6SGreg Kroah-Hartman device_remove_file(dev, &dev_attr_uevent); 25962620efefSGreg Kroah-Hartman device_remove_attrs(dev); 259728953533SBenjamin Herrenschmidt bus_remove_device(dev); 25984b6d1f12SLongX Zhang device_pm_remove(dev); 2599d1c3414cSGrant Likely driver_deferred_probe_del(dev); 260007de0e86SHeikki Krogerus device_platform_notify(dev, KOBJ_REMOVE); 2601478573c9SLukas Wunner device_remove_properties(dev); 26022ec16150SJeffy Chen device_links_purge(dev); 26031da177e4SLinus Torvalds 2604599bad38SJoerg Roedel if (dev->bus) 2605599bad38SJoerg Roedel blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 2606599bad38SJoerg Roedel BUS_NOTIFY_REMOVED_DEVICE, dev); 2607312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 2608cebf8fd1SMing Lei glue_dir = get_glue_dir(dev); 26091da177e4SLinus Torvalds kobject_del(&dev->kobj); 2610cebf8fd1SMing Lei cleanup_glue_dir(dev, glue_dir); 26111da177e4SLinus Torvalds put_device(parent); 26121da177e4SLinus Torvalds } 261386df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_del); 26141da177e4SLinus Torvalds 26151da177e4SLinus Torvalds /** 26161da177e4SLinus Torvalds * device_unregister - unregister device from system. 26171da177e4SLinus Torvalds * @dev: device going away. 26181da177e4SLinus Torvalds * 26191da177e4SLinus Torvalds * We do this in two parts, like we do device_register(). First, 26201da177e4SLinus Torvalds * we remove it from all the subsystems with device_del(), then 26211da177e4SLinus Torvalds * we decrement the reference count via put_device(). If that 26221da177e4SLinus Torvalds * is the final reference count, the device will be cleaned up 26231da177e4SLinus Torvalds * via device_release() above. Otherwise, the structure will 26241da177e4SLinus Torvalds * stick around until the final reference to the device is dropped. 26251da177e4SLinus Torvalds */ 26261da177e4SLinus Torvalds void device_unregister(struct device *dev) 26271da177e4SLinus Torvalds { 26281e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 26291da177e4SLinus Torvalds device_del(dev); 26301da177e4SLinus Torvalds put_device(dev); 26311da177e4SLinus Torvalds } 263286df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_unregister); 26331da177e4SLinus Torvalds 26343d060aebSAndy Shevchenko static struct device *prev_device(struct klist_iter *i) 26353d060aebSAndy Shevchenko { 26363d060aebSAndy Shevchenko struct klist_node *n = klist_prev(i); 26373d060aebSAndy Shevchenko struct device *dev = NULL; 26383d060aebSAndy Shevchenko struct device_private *p; 26393d060aebSAndy Shevchenko 26403d060aebSAndy Shevchenko if (n) { 26413d060aebSAndy Shevchenko p = to_device_private_parent(n); 26423d060aebSAndy Shevchenko dev = p->device; 26433d060aebSAndy Shevchenko } 26443d060aebSAndy Shevchenko return dev; 26453d060aebSAndy Shevchenko } 26463d060aebSAndy Shevchenko 264736239577Smochel@digitalimplant.org static struct device *next_device(struct klist_iter *i) 264836239577Smochel@digitalimplant.org { 264936239577Smochel@digitalimplant.org struct klist_node *n = klist_next(i); 2650f791b8c8SGreg Kroah-Hartman struct device *dev = NULL; 2651f791b8c8SGreg Kroah-Hartman struct device_private *p; 2652f791b8c8SGreg Kroah-Hartman 2653f791b8c8SGreg Kroah-Hartman if (n) { 2654f791b8c8SGreg Kroah-Hartman p = to_device_private_parent(n); 2655f791b8c8SGreg Kroah-Hartman dev = p->device; 2656f791b8c8SGreg Kroah-Hartman } 2657f791b8c8SGreg Kroah-Hartman return dev; 265836239577Smochel@digitalimplant.org } 265936239577Smochel@digitalimplant.org 26601da177e4SLinus Torvalds /** 2661e454cea2SKay Sievers * device_get_devnode - path of device node file 26626fcf53acSKay Sievers * @dev: device 2663e454cea2SKay Sievers * @mode: returned file access mode 26643c2670e6SKay Sievers * @uid: returned file owner 26653c2670e6SKay Sievers * @gid: returned file group 26666fcf53acSKay Sievers * @tmp: possibly allocated string 26676fcf53acSKay Sievers * 26686fcf53acSKay Sievers * Return the relative path of a possible device node. 26696fcf53acSKay Sievers * Non-default names may need to allocate a memory to compose 26706fcf53acSKay Sievers * a name. This memory is returned in tmp and needs to be 26716fcf53acSKay Sievers * freed by the caller. 26726fcf53acSKay Sievers */ 2673e454cea2SKay Sievers const char *device_get_devnode(struct device *dev, 26744e4098a3SGreg Kroah-Hartman umode_t *mode, kuid_t *uid, kgid_t *gid, 26753c2670e6SKay Sievers const char **tmp) 26766fcf53acSKay Sievers { 26776fcf53acSKay Sievers char *s; 26786fcf53acSKay Sievers 26796fcf53acSKay Sievers *tmp = NULL; 26806fcf53acSKay Sievers 26816fcf53acSKay Sievers /* the device type may provide a specific name */ 2682e454cea2SKay Sievers if (dev->type && dev->type->devnode) 26833c2670e6SKay Sievers *tmp = dev->type->devnode(dev, mode, uid, gid); 26846fcf53acSKay Sievers if (*tmp) 26856fcf53acSKay Sievers return *tmp; 26866fcf53acSKay Sievers 26876fcf53acSKay Sievers /* the class may provide a specific name */ 2688e454cea2SKay Sievers if (dev->class && dev->class->devnode) 2689e454cea2SKay Sievers *tmp = dev->class->devnode(dev, mode); 26906fcf53acSKay Sievers if (*tmp) 26916fcf53acSKay Sievers return *tmp; 26926fcf53acSKay Sievers 26936fcf53acSKay Sievers /* return name without allocation, tmp == NULL */ 26946fcf53acSKay Sievers if (strchr(dev_name(dev), '!') == NULL) 26956fcf53acSKay Sievers return dev_name(dev); 26966fcf53acSKay Sievers 26976fcf53acSKay Sievers /* replace '!' in the name with '/' */ 2698a29fd614SRasmus Villemoes s = kstrdup(dev_name(dev), GFP_KERNEL); 2699a29fd614SRasmus Villemoes if (!s) 27006fcf53acSKay Sievers return NULL; 2701a29fd614SRasmus Villemoes strreplace(s, '!', '/'); 2702a29fd614SRasmus Villemoes return *tmp = s; 27036fcf53acSKay Sievers } 27046fcf53acSKay Sievers 27056fcf53acSKay Sievers /** 27061da177e4SLinus Torvalds * device_for_each_child - device child iterator. 2707c41455fbSRandy Dunlap * @parent: parent struct device. 27081da177e4SLinus Torvalds * @fn: function to be called for each device. 2709f8878dcbSRobert P. J. Day * @data: data for the callback. 27101da177e4SLinus Torvalds * 2711c41455fbSRandy Dunlap * Iterate over @parent's child devices, and call @fn for each, 27121da177e4SLinus Torvalds * passing it @data. 27131da177e4SLinus Torvalds * 27141da177e4SLinus Torvalds * We check the return of @fn each time. If it returns anything 27151da177e4SLinus Torvalds * other than 0, we break out and return that value. 27161da177e4SLinus Torvalds */ 271736239577Smochel@digitalimplant.org int device_for_each_child(struct device *parent, void *data, 27184a3ad20cSGreg Kroah-Hartman int (*fn)(struct device *dev, void *data)) 27191da177e4SLinus Torvalds { 272036239577Smochel@digitalimplant.org struct klist_iter i; 27211da177e4SLinus Torvalds struct device *child; 27221da177e4SLinus Torvalds int error = 0; 27231da177e4SLinus Torvalds 2724014c90dbSGreg Kroah-Hartman if (!parent->p) 2725014c90dbSGreg Kroah-Hartman return 0; 2726014c90dbSGreg Kroah-Hartman 2727f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 272893ead7c9SGimcuan Hui while (!error && (child = next_device(&i))) 272936239577Smochel@digitalimplant.org error = fn(child, data); 273036239577Smochel@digitalimplant.org klist_iter_exit(&i); 27311da177e4SLinus Torvalds return error; 27321da177e4SLinus Torvalds } 273386df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_for_each_child); 27341da177e4SLinus Torvalds 27355ab69981SCornelia Huck /** 27363d060aebSAndy Shevchenko * device_for_each_child_reverse - device child iterator in reversed order. 27373d060aebSAndy Shevchenko * @parent: parent struct device. 27383d060aebSAndy Shevchenko * @fn: function to be called for each device. 27393d060aebSAndy Shevchenko * @data: data for the callback. 27403d060aebSAndy Shevchenko * 27413d060aebSAndy Shevchenko * Iterate over @parent's child devices, and call @fn for each, 27423d060aebSAndy Shevchenko * passing it @data. 27433d060aebSAndy Shevchenko * 27443d060aebSAndy Shevchenko * We check the return of @fn each time. If it returns anything 27453d060aebSAndy Shevchenko * other than 0, we break out and return that value. 27463d060aebSAndy Shevchenko */ 27473d060aebSAndy Shevchenko int device_for_each_child_reverse(struct device *parent, void *data, 27483d060aebSAndy Shevchenko int (*fn)(struct device *dev, void *data)) 27493d060aebSAndy Shevchenko { 27503d060aebSAndy Shevchenko struct klist_iter i; 27513d060aebSAndy Shevchenko struct device *child; 27523d060aebSAndy Shevchenko int error = 0; 27533d060aebSAndy Shevchenko 27543d060aebSAndy Shevchenko if (!parent->p) 27553d060aebSAndy Shevchenko return 0; 27563d060aebSAndy Shevchenko 27573d060aebSAndy Shevchenko klist_iter_init(&parent->p->klist_children, &i); 27583d060aebSAndy Shevchenko while ((child = prev_device(&i)) && !error) 27593d060aebSAndy Shevchenko error = fn(child, data); 27603d060aebSAndy Shevchenko klist_iter_exit(&i); 27613d060aebSAndy Shevchenko return error; 27623d060aebSAndy Shevchenko } 27633d060aebSAndy Shevchenko EXPORT_SYMBOL_GPL(device_for_each_child_reverse); 27643d060aebSAndy Shevchenko 27653d060aebSAndy Shevchenko /** 27665ab69981SCornelia Huck * device_find_child - device iterator for locating a particular device. 27675ab69981SCornelia Huck * @parent: parent struct device 27685ab69981SCornelia Huck * @match: Callback function to check device 2769f8878dcbSRobert P. J. Day * @data: Data to pass to match function 27705ab69981SCornelia Huck * 27715ab69981SCornelia Huck * This is similar to the device_for_each_child() function above, but it 27725ab69981SCornelia Huck * returns a reference to a device that is 'found' for later use, as 27735ab69981SCornelia Huck * determined by the @match callback. 27745ab69981SCornelia Huck * 27755ab69981SCornelia Huck * The callback should return 0 if the device doesn't match and non-zero 27765ab69981SCornelia Huck * if it does. If the callback returns non-zero and a reference to the 27775ab69981SCornelia Huck * current device can be obtained, this function will return to the caller 27785ab69981SCornelia Huck * and not iterate over any more devices. 2779a4e2400aSFederico Vaga * 2780a4e2400aSFederico Vaga * NOTE: you will need to drop the reference with put_device() after use. 27815ab69981SCornelia Huck */ 27825ab69981SCornelia Huck struct device *device_find_child(struct device *parent, void *data, 27834a3ad20cSGreg Kroah-Hartman int (*match)(struct device *dev, void *data)) 27845ab69981SCornelia Huck { 27855ab69981SCornelia Huck struct klist_iter i; 27865ab69981SCornelia Huck struct device *child; 27875ab69981SCornelia Huck 27885ab69981SCornelia Huck if (!parent) 27895ab69981SCornelia Huck return NULL; 27905ab69981SCornelia Huck 2791f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 27925ab69981SCornelia Huck while ((child = next_device(&i))) 27935ab69981SCornelia Huck if (match(child, data) && get_device(child)) 27945ab69981SCornelia Huck break; 27955ab69981SCornelia Huck klist_iter_exit(&i); 27965ab69981SCornelia Huck return child; 27975ab69981SCornelia Huck } 279886df2687SDavid Graham White EXPORT_SYMBOL_GPL(device_find_child); 27995ab69981SCornelia Huck 2800dad9bb01SHeikki Krogerus /** 2801dad9bb01SHeikki Krogerus * device_find_child_by_name - device iterator for locating a child device. 2802dad9bb01SHeikki Krogerus * @parent: parent struct device 2803dad9bb01SHeikki Krogerus * @name: name of the child device 2804dad9bb01SHeikki Krogerus * 2805dad9bb01SHeikki Krogerus * This is similar to the device_find_child() function above, but it 2806dad9bb01SHeikki Krogerus * returns a reference to a device that has the name @name. 2807dad9bb01SHeikki Krogerus * 2808dad9bb01SHeikki Krogerus * NOTE: you will need to drop the reference with put_device() after use. 2809dad9bb01SHeikki Krogerus */ 2810dad9bb01SHeikki Krogerus struct device *device_find_child_by_name(struct device *parent, 2811dad9bb01SHeikki Krogerus const char *name) 2812dad9bb01SHeikki Krogerus { 2813dad9bb01SHeikki Krogerus struct klist_iter i; 2814dad9bb01SHeikki Krogerus struct device *child; 2815dad9bb01SHeikki Krogerus 2816dad9bb01SHeikki Krogerus if (!parent) 2817dad9bb01SHeikki Krogerus return NULL; 2818dad9bb01SHeikki Krogerus 2819dad9bb01SHeikki Krogerus klist_iter_init(&parent->p->klist_children, &i); 2820dad9bb01SHeikki Krogerus while ((child = next_device(&i))) 2821dad9bb01SHeikki Krogerus if (!strcmp(dev_name(child), name) && get_device(child)) 2822dad9bb01SHeikki Krogerus break; 2823dad9bb01SHeikki Krogerus klist_iter_exit(&i); 2824dad9bb01SHeikki Krogerus return child; 2825dad9bb01SHeikki Krogerus } 2826dad9bb01SHeikki Krogerus EXPORT_SYMBOL_GPL(device_find_child_by_name); 2827dad9bb01SHeikki Krogerus 28281da177e4SLinus Torvalds int __init devices_init(void) 28291da177e4SLinus Torvalds { 2830881c6cfdSGreg Kroah-Hartman devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); 2831881c6cfdSGreg Kroah-Hartman if (!devices_kset) 2832881c6cfdSGreg Kroah-Hartman return -ENOMEM; 2833e105b8bfSDan Williams dev_kobj = kobject_create_and_add("dev", NULL); 2834e105b8bfSDan Williams if (!dev_kobj) 2835e105b8bfSDan Williams goto dev_kobj_err; 2836e105b8bfSDan Williams sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); 2837e105b8bfSDan Williams if (!sysfs_dev_block_kobj) 2838e105b8bfSDan Williams goto block_kobj_err; 2839e105b8bfSDan Williams sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); 2840e105b8bfSDan Williams if (!sysfs_dev_char_kobj) 2841e105b8bfSDan Williams goto char_kobj_err; 2842e105b8bfSDan Williams 2843881c6cfdSGreg Kroah-Hartman return 0; 2844e105b8bfSDan Williams 2845e105b8bfSDan Williams char_kobj_err: 2846e105b8bfSDan Williams kobject_put(sysfs_dev_block_kobj); 2847e105b8bfSDan Williams block_kobj_err: 2848e105b8bfSDan Williams kobject_put(dev_kobj); 2849e105b8bfSDan Williams dev_kobj_err: 2850e105b8bfSDan Williams kset_unregister(devices_kset); 2851e105b8bfSDan Williams return -ENOMEM; 28521da177e4SLinus Torvalds } 28531da177e4SLinus Torvalds 28544f3549d7SRafael J. Wysocki static int device_check_offline(struct device *dev, void *not_used) 28554f3549d7SRafael J. Wysocki { 28564f3549d7SRafael J. Wysocki int ret; 28574f3549d7SRafael J. Wysocki 28584f3549d7SRafael J. Wysocki ret = device_for_each_child(dev, NULL, device_check_offline); 28594f3549d7SRafael J. Wysocki if (ret) 28604f3549d7SRafael J. Wysocki return ret; 28614f3549d7SRafael J. Wysocki 28624f3549d7SRafael J. Wysocki return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; 28634f3549d7SRafael J. Wysocki } 28644f3549d7SRafael J. Wysocki 28654f3549d7SRafael J. Wysocki /** 28664f3549d7SRafael J. Wysocki * device_offline - Prepare the device for hot-removal. 28674f3549d7SRafael J. Wysocki * @dev: Device to be put offline. 28684f3549d7SRafael J. Wysocki * 28694f3549d7SRafael J. Wysocki * Execute the device bus type's .offline() callback, if present, to prepare 28704f3549d7SRafael J. Wysocki * the device for a subsequent hot-removal. If that succeeds, the device must 28714f3549d7SRafael J. Wysocki * not be used until either it is removed or its bus type's .online() callback 28724f3549d7SRafael J. Wysocki * is executed. 28734f3549d7SRafael J. Wysocki * 28744f3549d7SRafael J. Wysocki * Call under device_hotplug_lock. 28754f3549d7SRafael J. Wysocki */ 28764f3549d7SRafael J. Wysocki int device_offline(struct device *dev) 28774f3549d7SRafael J. Wysocki { 28784f3549d7SRafael J. Wysocki int ret; 28794f3549d7SRafael J. Wysocki 28804f3549d7SRafael J. Wysocki if (dev->offline_disabled) 28814f3549d7SRafael J. Wysocki return -EPERM; 28824f3549d7SRafael J. Wysocki 28834f3549d7SRafael J. Wysocki ret = device_for_each_child(dev, NULL, device_check_offline); 28844f3549d7SRafael J. Wysocki if (ret) 28854f3549d7SRafael J. Wysocki return ret; 28864f3549d7SRafael J. Wysocki 28874f3549d7SRafael J. Wysocki device_lock(dev); 28884f3549d7SRafael J. Wysocki if (device_supports_offline(dev)) { 28894f3549d7SRafael J. Wysocki if (dev->offline) { 28904f3549d7SRafael J. Wysocki ret = 1; 28914f3549d7SRafael J. Wysocki } else { 28924f3549d7SRafael J. Wysocki ret = dev->bus->offline(dev); 28934f3549d7SRafael J. Wysocki if (!ret) { 28944f3549d7SRafael J. Wysocki kobject_uevent(&dev->kobj, KOBJ_OFFLINE); 28954f3549d7SRafael J. Wysocki dev->offline = true; 28964f3549d7SRafael J. Wysocki } 28974f3549d7SRafael J. Wysocki } 28984f3549d7SRafael J. Wysocki } 28994f3549d7SRafael J. Wysocki device_unlock(dev); 29004f3549d7SRafael J. Wysocki 29014f3549d7SRafael J. Wysocki return ret; 29024f3549d7SRafael J. Wysocki } 29034f3549d7SRafael J. Wysocki 29044f3549d7SRafael J. Wysocki /** 29054f3549d7SRafael J. Wysocki * device_online - Put the device back online after successful device_offline(). 29064f3549d7SRafael J. Wysocki * @dev: Device to be put back online. 29074f3549d7SRafael J. Wysocki * 29084f3549d7SRafael J. Wysocki * If device_offline() has been successfully executed for @dev, but the device 29094f3549d7SRafael J. Wysocki * has not been removed subsequently, execute its bus type's .online() callback 29104f3549d7SRafael J. Wysocki * to indicate that the device can be used again. 29114f3549d7SRafael J. Wysocki * 29124f3549d7SRafael J. Wysocki * Call under device_hotplug_lock. 29134f3549d7SRafael J. Wysocki */ 29144f3549d7SRafael J. Wysocki int device_online(struct device *dev) 29154f3549d7SRafael J. Wysocki { 29164f3549d7SRafael J. Wysocki int ret = 0; 29174f3549d7SRafael J. Wysocki 29184f3549d7SRafael J. Wysocki device_lock(dev); 29194f3549d7SRafael J. Wysocki if (device_supports_offline(dev)) { 29204f3549d7SRafael J. Wysocki if (dev->offline) { 29214f3549d7SRafael J. Wysocki ret = dev->bus->online(dev); 29224f3549d7SRafael J. Wysocki if (!ret) { 29234f3549d7SRafael J. Wysocki kobject_uevent(&dev->kobj, KOBJ_ONLINE); 29244f3549d7SRafael J. Wysocki dev->offline = false; 29254f3549d7SRafael J. Wysocki } 29264f3549d7SRafael J. Wysocki } else { 29274f3549d7SRafael J. Wysocki ret = 1; 29284f3549d7SRafael J. Wysocki } 29294f3549d7SRafael J. Wysocki } 29304f3549d7SRafael J. Wysocki device_unlock(dev); 29314f3549d7SRafael J. Wysocki 29324f3549d7SRafael J. Wysocki return ret; 29334f3549d7SRafael J. Wysocki } 29344f3549d7SRafael J. Wysocki 29357f100d15SKarthigan Srinivasan struct root_device { 29360aa0dc41SMark McLoughlin struct device dev; 29370aa0dc41SMark McLoughlin struct module *owner; 29380aa0dc41SMark McLoughlin }; 29390aa0dc41SMark McLoughlin 294093058424SJosh Triplett static inline struct root_device *to_root_device(struct device *d) 2941481e2079SFerenc Wagner { 2942481e2079SFerenc Wagner return container_of(d, struct root_device, dev); 2943481e2079SFerenc Wagner } 29440aa0dc41SMark McLoughlin 29450aa0dc41SMark McLoughlin static void root_device_release(struct device *dev) 29460aa0dc41SMark McLoughlin { 29470aa0dc41SMark McLoughlin kfree(to_root_device(dev)); 29480aa0dc41SMark McLoughlin } 29490aa0dc41SMark McLoughlin 29500aa0dc41SMark McLoughlin /** 29510aa0dc41SMark McLoughlin * __root_device_register - allocate and register a root device 29520aa0dc41SMark McLoughlin * @name: root device name 29530aa0dc41SMark McLoughlin * @owner: owner module of the root device, usually THIS_MODULE 29540aa0dc41SMark McLoughlin * 29550aa0dc41SMark McLoughlin * This function allocates a root device and registers it 29560aa0dc41SMark McLoughlin * using device_register(). In order to free the returned 29570aa0dc41SMark McLoughlin * device, use root_device_unregister(). 29580aa0dc41SMark McLoughlin * 29590aa0dc41SMark McLoughlin * Root devices are dummy devices which allow other devices 29600aa0dc41SMark McLoughlin * to be grouped under /sys/devices. Use this function to 29610aa0dc41SMark McLoughlin * allocate a root device and then use it as the parent of 29620aa0dc41SMark McLoughlin * any device which should appear under /sys/devices/{name} 29630aa0dc41SMark McLoughlin * 29640aa0dc41SMark McLoughlin * The /sys/devices/{name} directory will also contain a 29650aa0dc41SMark McLoughlin * 'module' symlink which points to the @owner directory 29660aa0dc41SMark McLoughlin * in sysfs. 29670aa0dc41SMark McLoughlin * 2968f0eae0edSJani Nikula * Returns &struct device pointer on success, or ERR_PTR() on error. 2969f0eae0edSJani Nikula * 29700aa0dc41SMark McLoughlin * Note: You probably want to use root_device_register(). 29710aa0dc41SMark McLoughlin */ 29720aa0dc41SMark McLoughlin struct device *__root_device_register(const char *name, struct module *owner) 29730aa0dc41SMark McLoughlin { 29740aa0dc41SMark McLoughlin struct root_device *root; 29750aa0dc41SMark McLoughlin int err = -ENOMEM; 29760aa0dc41SMark McLoughlin 29770aa0dc41SMark McLoughlin root = kzalloc(sizeof(struct root_device), GFP_KERNEL); 29780aa0dc41SMark McLoughlin if (!root) 29790aa0dc41SMark McLoughlin return ERR_PTR(err); 29800aa0dc41SMark McLoughlin 2981acc0e90fSGreg Kroah-Hartman err = dev_set_name(&root->dev, "%s", name); 29820aa0dc41SMark McLoughlin if (err) { 29830aa0dc41SMark McLoughlin kfree(root); 29840aa0dc41SMark McLoughlin return ERR_PTR(err); 29850aa0dc41SMark McLoughlin } 29860aa0dc41SMark McLoughlin 29870aa0dc41SMark McLoughlin root->dev.release = root_device_release; 29880aa0dc41SMark McLoughlin 29890aa0dc41SMark McLoughlin err = device_register(&root->dev); 29900aa0dc41SMark McLoughlin if (err) { 29910aa0dc41SMark McLoughlin put_device(&root->dev); 29920aa0dc41SMark McLoughlin return ERR_PTR(err); 29930aa0dc41SMark McLoughlin } 29940aa0dc41SMark McLoughlin 29951d9e882bSChristoph Egger #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ 29960aa0dc41SMark McLoughlin if (owner) { 29970aa0dc41SMark McLoughlin struct module_kobject *mk = &owner->mkobj; 29980aa0dc41SMark McLoughlin 29990aa0dc41SMark McLoughlin err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); 30000aa0dc41SMark McLoughlin if (err) { 30010aa0dc41SMark McLoughlin device_unregister(&root->dev); 30020aa0dc41SMark McLoughlin return ERR_PTR(err); 30030aa0dc41SMark McLoughlin } 30040aa0dc41SMark McLoughlin root->owner = owner; 30050aa0dc41SMark McLoughlin } 30060aa0dc41SMark McLoughlin #endif 30070aa0dc41SMark McLoughlin 30080aa0dc41SMark McLoughlin return &root->dev; 30090aa0dc41SMark McLoughlin } 30100aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(__root_device_register); 30110aa0dc41SMark McLoughlin 30120aa0dc41SMark McLoughlin /** 30130aa0dc41SMark McLoughlin * root_device_unregister - unregister and free a root device 30147cbcf225SRandy Dunlap * @dev: device going away 30150aa0dc41SMark McLoughlin * 30160aa0dc41SMark McLoughlin * This function unregisters and cleans up a device that was created by 30170aa0dc41SMark McLoughlin * root_device_register(). 30180aa0dc41SMark McLoughlin */ 30190aa0dc41SMark McLoughlin void root_device_unregister(struct device *dev) 30200aa0dc41SMark McLoughlin { 30210aa0dc41SMark McLoughlin struct root_device *root = to_root_device(dev); 30220aa0dc41SMark McLoughlin 30230aa0dc41SMark McLoughlin if (root->owner) 30240aa0dc41SMark McLoughlin sysfs_remove_link(&root->dev.kobj, "module"); 30250aa0dc41SMark McLoughlin 30260aa0dc41SMark McLoughlin device_unregister(dev); 30270aa0dc41SMark McLoughlin } 30280aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(root_device_unregister); 30290aa0dc41SMark McLoughlin 303023681e47SGreg Kroah-Hartman 303123681e47SGreg Kroah-Hartman static void device_create_release(struct device *dev) 303223681e47SGreg Kroah-Hartman { 30331e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 303423681e47SGreg Kroah-Hartman kfree(dev); 303523681e47SGreg Kroah-Hartman } 303623681e47SGreg Kroah-Hartman 30376a8b55d7SMathieu Malaterre static __printf(6, 0) struct device * 303839ef3112SGuenter Roeck device_create_groups_vargs(struct class *class, struct device *parent, 303939ef3112SGuenter Roeck dev_t devt, void *drvdata, 304039ef3112SGuenter Roeck const struct attribute_group **groups, 304139ef3112SGuenter Roeck const char *fmt, va_list args) 304239ef3112SGuenter Roeck { 304339ef3112SGuenter Roeck struct device *dev = NULL; 304439ef3112SGuenter Roeck int retval = -ENODEV; 304539ef3112SGuenter Roeck 304639ef3112SGuenter Roeck if (class == NULL || IS_ERR(class)) 304739ef3112SGuenter Roeck goto error; 304839ef3112SGuenter Roeck 304939ef3112SGuenter Roeck dev = kzalloc(sizeof(*dev), GFP_KERNEL); 305039ef3112SGuenter Roeck if (!dev) { 305139ef3112SGuenter Roeck retval = -ENOMEM; 305239ef3112SGuenter Roeck goto error; 305339ef3112SGuenter Roeck } 305439ef3112SGuenter Roeck 3055bbc780f8SDavid Herrmann device_initialize(dev); 305639ef3112SGuenter Roeck dev->devt = devt; 305739ef3112SGuenter Roeck dev->class = class; 305839ef3112SGuenter Roeck dev->parent = parent; 305939ef3112SGuenter Roeck dev->groups = groups; 306039ef3112SGuenter Roeck dev->release = device_create_release; 306139ef3112SGuenter Roeck dev_set_drvdata(dev, drvdata); 306239ef3112SGuenter Roeck 306339ef3112SGuenter Roeck retval = kobject_set_name_vargs(&dev->kobj, fmt, args); 306439ef3112SGuenter Roeck if (retval) 306539ef3112SGuenter Roeck goto error; 306639ef3112SGuenter Roeck 3067bbc780f8SDavid Herrmann retval = device_add(dev); 306839ef3112SGuenter Roeck if (retval) 306939ef3112SGuenter Roeck goto error; 307039ef3112SGuenter Roeck 307139ef3112SGuenter Roeck return dev; 307239ef3112SGuenter Roeck 307339ef3112SGuenter Roeck error: 307439ef3112SGuenter Roeck put_device(dev); 307539ef3112SGuenter Roeck return ERR_PTR(retval); 307639ef3112SGuenter Roeck } 307739ef3112SGuenter Roeck 307823681e47SGreg Kroah-Hartman /** 30798882b394SGreg Kroah-Hartman * device_create_vargs - creates a device and registers it with sysfs 30808882b394SGreg Kroah-Hartman * @class: pointer to the struct class that this device should be registered to 30818882b394SGreg Kroah-Hartman * @parent: pointer to the parent struct device of this new device, if any 30828882b394SGreg Kroah-Hartman * @devt: the dev_t for the char device to be added 30838882b394SGreg Kroah-Hartman * @drvdata: the data to be added to the device for callbacks 30848882b394SGreg Kroah-Hartman * @fmt: string for the device's name 30858882b394SGreg Kroah-Hartman * @args: va_list for the device's name 30868882b394SGreg Kroah-Hartman * 30878882b394SGreg Kroah-Hartman * This function can be used by char device classes. A struct device 30888882b394SGreg Kroah-Hartman * will be created in sysfs, registered to the specified class. 30898882b394SGreg Kroah-Hartman * 30908882b394SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 30918882b394SGreg Kroah-Hartman * the dev_t is not 0,0. 30928882b394SGreg Kroah-Hartman * If a pointer to a parent struct device is passed in, the newly created 30938882b394SGreg Kroah-Hartman * struct device will be a child of that device in sysfs. 30948882b394SGreg Kroah-Hartman * The pointer to the struct device will be returned from the call. 30958882b394SGreg Kroah-Hartman * Any further sysfs files that might be required can be created using this 30968882b394SGreg Kroah-Hartman * pointer. 30978882b394SGreg Kroah-Hartman * 3098f0eae0edSJani Nikula * Returns &struct device pointer on success, or ERR_PTR() on error. 3099f0eae0edSJani Nikula * 31008882b394SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 31018882b394SGreg Kroah-Hartman * been created with a call to class_create(). 31028882b394SGreg Kroah-Hartman */ 31038882b394SGreg Kroah-Hartman struct device *device_create_vargs(struct class *class, struct device *parent, 31048882b394SGreg Kroah-Hartman dev_t devt, void *drvdata, const char *fmt, 31058882b394SGreg Kroah-Hartman va_list args) 31068882b394SGreg Kroah-Hartman { 310739ef3112SGuenter Roeck return device_create_groups_vargs(class, parent, devt, drvdata, NULL, 310839ef3112SGuenter Roeck fmt, args); 31098882b394SGreg Kroah-Hartman } 31108882b394SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_vargs); 31118882b394SGreg Kroah-Hartman 31128882b394SGreg Kroah-Hartman /** 31134e106739SGreg Kroah-Hartman * device_create - creates a device and registers it with sysfs 31148882b394SGreg Kroah-Hartman * @class: pointer to the struct class that this device should be registered to 31158882b394SGreg Kroah-Hartman * @parent: pointer to the parent struct device of this new device, if any 31168882b394SGreg Kroah-Hartman * @devt: the dev_t for the char device to be added 31178882b394SGreg Kroah-Hartman * @drvdata: the data to be added to the device for callbacks 31188882b394SGreg Kroah-Hartman * @fmt: string for the device's name 31198882b394SGreg Kroah-Hartman * 31208882b394SGreg Kroah-Hartman * This function can be used by char device classes. A struct device 31218882b394SGreg Kroah-Hartman * will be created in sysfs, registered to the specified class. 31228882b394SGreg Kroah-Hartman * 31238882b394SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 31248882b394SGreg Kroah-Hartman * the dev_t is not 0,0. 31258882b394SGreg Kroah-Hartman * If a pointer to a parent struct device is passed in, the newly created 31268882b394SGreg Kroah-Hartman * struct device will be a child of that device in sysfs. 31278882b394SGreg Kroah-Hartman * The pointer to the struct device will be returned from the call. 31288882b394SGreg Kroah-Hartman * Any further sysfs files that might be required can be created using this 31298882b394SGreg Kroah-Hartman * pointer. 31308882b394SGreg Kroah-Hartman * 3131f0eae0edSJani Nikula * Returns &struct device pointer on success, or ERR_PTR() on error. 3132f0eae0edSJani Nikula * 31338882b394SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 31348882b394SGreg Kroah-Hartman * been created with a call to class_create(). 31358882b394SGreg Kroah-Hartman */ 31364e106739SGreg Kroah-Hartman struct device *device_create(struct class *class, struct device *parent, 31374e106739SGreg Kroah-Hartman dev_t devt, void *drvdata, const char *fmt, ...) 31388882b394SGreg Kroah-Hartman { 31398882b394SGreg Kroah-Hartman va_list vargs; 31408882b394SGreg Kroah-Hartman struct device *dev; 31418882b394SGreg Kroah-Hartman 31428882b394SGreg Kroah-Hartman va_start(vargs, fmt); 31438882b394SGreg Kroah-Hartman dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); 31448882b394SGreg Kroah-Hartman va_end(vargs); 31458882b394SGreg Kroah-Hartman return dev; 31468882b394SGreg Kroah-Hartman } 31474e106739SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create); 31488882b394SGreg Kroah-Hartman 314939ef3112SGuenter Roeck /** 315039ef3112SGuenter Roeck * device_create_with_groups - creates a device and registers it with sysfs 315139ef3112SGuenter Roeck * @class: pointer to the struct class that this device should be registered to 315239ef3112SGuenter Roeck * @parent: pointer to the parent struct device of this new device, if any 315339ef3112SGuenter Roeck * @devt: the dev_t for the char device to be added 315439ef3112SGuenter Roeck * @drvdata: the data to be added to the device for callbacks 315539ef3112SGuenter Roeck * @groups: NULL-terminated list of attribute groups to be created 315639ef3112SGuenter Roeck * @fmt: string for the device's name 315739ef3112SGuenter Roeck * 315839ef3112SGuenter Roeck * This function can be used by char device classes. A struct device 315939ef3112SGuenter Roeck * will be created in sysfs, registered to the specified class. 316039ef3112SGuenter Roeck * Additional attributes specified in the groups parameter will also 316139ef3112SGuenter Roeck * be created automatically. 316239ef3112SGuenter Roeck * 316339ef3112SGuenter Roeck * A "dev" file will be created, showing the dev_t for the device, if 316439ef3112SGuenter Roeck * the dev_t is not 0,0. 316539ef3112SGuenter Roeck * If a pointer to a parent struct device is passed in, the newly created 316639ef3112SGuenter Roeck * struct device will be a child of that device in sysfs. 316739ef3112SGuenter Roeck * The pointer to the struct device will be returned from the call. 316839ef3112SGuenter Roeck * Any further sysfs files that might be required can be created using this 316939ef3112SGuenter Roeck * pointer. 317039ef3112SGuenter Roeck * 317139ef3112SGuenter Roeck * Returns &struct device pointer on success, or ERR_PTR() on error. 317239ef3112SGuenter Roeck * 317339ef3112SGuenter Roeck * Note: the struct class passed to this function must have previously 317439ef3112SGuenter Roeck * been created with a call to class_create(). 317539ef3112SGuenter Roeck */ 317639ef3112SGuenter Roeck struct device *device_create_with_groups(struct class *class, 317739ef3112SGuenter Roeck struct device *parent, dev_t devt, 317839ef3112SGuenter Roeck void *drvdata, 317939ef3112SGuenter Roeck const struct attribute_group **groups, 318039ef3112SGuenter Roeck const char *fmt, ...) 318139ef3112SGuenter Roeck { 318239ef3112SGuenter Roeck va_list vargs; 318339ef3112SGuenter Roeck struct device *dev; 318439ef3112SGuenter Roeck 318539ef3112SGuenter Roeck va_start(vargs, fmt); 318639ef3112SGuenter Roeck dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, 318739ef3112SGuenter Roeck fmt, vargs); 318839ef3112SGuenter Roeck va_end(vargs); 318939ef3112SGuenter Roeck return dev; 319039ef3112SGuenter Roeck } 319139ef3112SGuenter Roeck EXPORT_SYMBOL_GPL(device_create_with_groups); 319239ef3112SGuenter Roeck 3193775b64d2SRafael J. Wysocki /** 3194775b64d2SRafael J. Wysocki * device_destroy - removes a device that was created with device_create() 3195775b64d2SRafael J. Wysocki * @class: pointer to the struct class that this device was registered with 3196775b64d2SRafael J. Wysocki * @devt: the dev_t of the device that was previously registered 3197775b64d2SRafael J. Wysocki * 3198775b64d2SRafael J. Wysocki * This call unregisters and cleans up a device that was created with a 3199775b64d2SRafael J. Wysocki * call to device_create(). 3200775b64d2SRafael J. Wysocki */ 3201775b64d2SRafael J. Wysocki void device_destroy(struct class *class, dev_t devt) 3202775b64d2SRafael J. Wysocki { 3203775b64d2SRafael J. Wysocki struct device *dev; 3204775b64d2SRafael J. Wysocki 32054495dfddSSuzuki K Poulose dev = class_find_device_by_devt(class, devt); 3206cd35449bSDave Young if (dev) { 3207cd35449bSDave Young put_device(dev); 320823681e47SGreg Kroah-Hartman device_unregister(dev); 320923681e47SGreg Kroah-Hartman } 3210cd35449bSDave Young } 321123681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_destroy); 3212a2de48caSGreg Kroah-Hartman 3213a2de48caSGreg Kroah-Hartman /** 3214a2de48caSGreg Kroah-Hartman * device_rename - renames a device 3215a2de48caSGreg Kroah-Hartman * @dev: the pointer to the struct device to be renamed 3216a2de48caSGreg Kroah-Hartman * @new_name: the new name of the device 3217030c1d2bSEric W. Biederman * 3218030c1d2bSEric W. Biederman * It is the responsibility of the caller to provide mutual 3219030c1d2bSEric W. Biederman * exclusion between two different calls of device_rename 3220030c1d2bSEric W. Biederman * on the same device to ensure that new_name is valid and 3221030c1d2bSEric W. Biederman * won't conflict with other devices. 3222c6c0ac66SMichael Ellerman * 3223a5462516STimur Tabi * Note: Don't call this function. Currently, the networking layer calls this 3224a5462516STimur Tabi * function, but that will change. The following text from Kay Sievers offers 3225a5462516STimur Tabi * some insight: 3226a5462516STimur Tabi * 3227a5462516STimur Tabi * Renaming devices is racy at many levels, symlinks and other stuff are not 3228a5462516STimur Tabi * replaced atomically, and you get a "move" uevent, but it's not easy to 3229a5462516STimur Tabi * connect the event to the old and new device. Device nodes are not renamed at 3230a5462516STimur Tabi * all, there isn't even support for that in the kernel now. 3231a5462516STimur Tabi * 3232a5462516STimur Tabi * In the meantime, during renaming, your target name might be taken by another 3233a5462516STimur Tabi * driver, creating conflicts. Or the old name is taken directly after you 3234a5462516STimur Tabi * renamed it -- then you get events for the same DEVPATH, before you even see 3235a5462516STimur Tabi * the "move" event. It's just a mess, and nothing new should ever rely on 3236a5462516STimur Tabi * kernel device renaming. Besides that, it's not even implemented now for 3237a5462516STimur Tabi * other things than (driver-core wise very simple) network devices. 3238a5462516STimur Tabi * 3239a5462516STimur Tabi * We are currently about to change network renaming in udev to completely 3240a5462516STimur Tabi * disallow renaming of devices in the same namespace as the kernel uses, 3241a5462516STimur Tabi * because we can't solve the problems properly, that arise with swapping names 3242a5462516STimur Tabi * of multiple interfaces without races. Means, renaming of eth[0-9]* will only 3243a5462516STimur Tabi * be allowed to some other name than eth[0-9]*, for the aforementioned 3244a5462516STimur Tabi * reasons. 3245a5462516STimur Tabi * 3246a5462516STimur Tabi * Make up a "real" name in the driver before you register anything, or add 3247a5462516STimur Tabi * some other attributes for userspace to find the device, or use udev to add 3248a5462516STimur Tabi * symlinks -- but never rename kernel devices later, it's a complete mess. We 3249a5462516STimur Tabi * don't even want to get into that and try to implement the missing pieces in 3250a5462516STimur Tabi * the core. We really have other pieces to fix in the driver core mess. :) 3251a2de48caSGreg Kroah-Hartman */ 32526937e8f8SJohannes Berg int device_rename(struct device *dev, const char *new_name) 3253a2de48caSGreg Kroah-Hartman { 32544b30ee58STejun Heo struct kobject *kobj = &dev->kobj; 32552ee97cafSCornelia Huck char *old_device_name = NULL; 3256a2de48caSGreg Kroah-Hartman int error; 3257a2de48caSGreg Kroah-Hartman 3258a2de48caSGreg Kroah-Hartman dev = get_device(dev); 3259a2de48caSGreg Kroah-Hartman if (!dev) 3260a2de48caSGreg Kroah-Hartman return -EINVAL; 3261a2de48caSGreg Kroah-Hartman 326269df7533Sethan.zhao dev_dbg(dev, "renaming to %s\n", new_name); 3263a2de48caSGreg Kroah-Hartman 32641fa5ae85SKay Sievers old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); 32652ee97cafSCornelia Huck if (!old_device_name) { 3266952ab431SJesper Juhl error = -ENOMEM; 32672ee97cafSCornelia Huck goto out; 3268952ab431SJesper Juhl } 3269a2de48caSGreg Kroah-Hartman 3270f349cf34SEric W. Biederman if (dev->class) { 32714b30ee58STejun Heo error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, 32724b30ee58STejun Heo kobj, old_device_name, 32734b30ee58STejun Heo new_name, kobject_namespace(kobj)); 3274f349cf34SEric W. Biederman if (error) 3275f349cf34SEric W. Biederman goto out; 3276f349cf34SEric W. Biederman } 327739aba963SKay Sievers 32784b30ee58STejun Heo error = kobject_rename(kobj, new_name); 32791fa5ae85SKay Sievers if (error) 32802ee97cafSCornelia Huck goto out; 3281a2de48caSGreg Kroah-Hartman 32822ee97cafSCornelia Huck out: 3283a2de48caSGreg Kroah-Hartman put_device(dev); 3284a2de48caSGreg Kroah-Hartman 32852ee97cafSCornelia Huck kfree(old_device_name); 3286a2de48caSGreg Kroah-Hartman 3287a2de48caSGreg Kroah-Hartman return error; 3288a2de48caSGreg Kroah-Hartman } 3289a2807dbcSJohannes Berg EXPORT_SYMBOL_GPL(device_rename); 32908a82472fSCornelia Huck 32918a82472fSCornelia Huck static int device_move_class_links(struct device *dev, 32928a82472fSCornelia Huck struct device *old_parent, 32938a82472fSCornelia Huck struct device *new_parent) 32948a82472fSCornelia Huck { 3295f7f3461dSGreg Kroah-Hartman int error = 0; 32968a82472fSCornelia Huck 3297f7f3461dSGreg Kroah-Hartman if (old_parent) 3298f7f3461dSGreg Kroah-Hartman sysfs_remove_link(&dev->kobj, "device"); 3299f7f3461dSGreg Kroah-Hartman if (new_parent) 3300f7f3461dSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 3301f7f3461dSGreg Kroah-Hartman "device"); 3302f7f3461dSGreg Kroah-Hartman return error; 33038a82472fSCornelia Huck } 33048a82472fSCornelia Huck 33058a82472fSCornelia Huck /** 33068a82472fSCornelia Huck * device_move - moves a device to a new parent 33078a82472fSCornelia Huck * @dev: the pointer to the struct device to be moved 330813509860SWolfram Sang * @new_parent: the new parent of the device (can be NULL) 3309ffa6a705SCornelia Huck * @dpm_order: how to reorder the dpm_list 33108a82472fSCornelia Huck */ 3311ffa6a705SCornelia Huck int device_move(struct device *dev, struct device *new_parent, 3312ffa6a705SCornelia Huck enum dpm_order dpm_order) 33138a82472fSCornelia Huck { 33148a82472fSCornelia Huck int error; 33158a82472fSCornelia Huck struct device *old_parent; 3316c744aeaeSCornelia Huck struct kobject *new_parent_kobj; 33178a82472fSCornelia Huck 33188a82472fSCornelia Huck dev = get_device(dev); 33198a82472fSCornelia Huck if (!dev) 33208a82472fSCornelia Huck return -EINVAL; 33218a82472fSCornelia Huck 3322ffa6a705SCornelia Huck device_pm_lock(); 33238a82472fSCornelia Huck new_parent = get_device(new_parent); 3324c744aeaeSCornelia Huck new_parent_kobj = get_device_parent(dev, new_parent); 332584d0c27dSTetsuo Handa if (IS_ERR(new_parent_kobj)) { 332684d0c27dSTetsuo Handa error = PTR_ERR(new_parent_kobj); 332784d0c27dSTetsuo Handa put_device(new_parent); 332884d0c27dSTetsuo Handa goto out; 332984d0c27dSTetsuo Handa } 333063b6971aSCornelia Huck 33311e0b2cf9SKay Sievers pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), 33321e0b2cf9SKay Sievers __func__, new_parent ? dev_name(new_parent) : "<NULL>"); 3333c744aeaeSCornelia Huck error = kobject_move(&dev->kobj, new_parent_kobj); 33348a82472fSCornelia Huck if (error) { 333563b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 33368a82472fSCornelia Huck put_device(new_parent); 33378a82472fSCornelia Huck goto out; 33388a82472fSCornelia Huck } 33398a82472fSCornelia Huck old_parent = dev->parent; 33408a82472fSCornelia Huck dev->parent = new_parent; 33418a82472fSCornelia Huck if (old_parent) 3342f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 33430d358f22SYinghai Lu if (new_parent) { 3344f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 3345f791b8c8SGreg Kroah-Hartman &new_parent->p->klist_children); 33460d358f22SYinghai Lu set_dev_node(dev, dev_to_node(new_parent)); 33470d358f22SYinghai Lu } 33480d358f22SYinghai Lu 3349bdd4034dSRabin Vincent if (dev->class) { 33508a82472fSCornelia Huck error = device_move_class_links(dev, old_parent, new_parent); 33518a82472fSCornelia Huck if (error) { 33528a82472fSCornelia Huck /* We ignore errors on cleanup since we're hosed anyway... */ 33538a82472fSCornelia Huck device_move_class_links(dev, new_parent, old_parent); 33548a82472fSCornelia Huck if (!kobject_move(&dev->kobj, &old_parent->kobj)) { 3355c744aeaeSCornelia Huck if (new_parent) 3356f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 33570d358f22SYinghai Lu dev->parent = old_parent; 33580d358f22SYinghai Lu if (old_parent) { 3359f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 3360f791b8c8SGreg Kroah-Hartman &old_parent->p->klist_children); 33610d358f22SYinghai Lu set_dev_node(dev, dev_to_node(old_parent)); 33620d358f22SYinghai Lu } 33638a82472fSCornelia Huck } 336463b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 33658a82472fSCornelia Huck put_device(new_parent); 33668a82472fSCornelia Huck goto out; 33678a82472fSCornelia Huck } 3368bdd4034dSRabin Vincent } 3369ffa6a705SCornelia Huck switch (dpm_order) { 3370ffa6a705SCornelia Huck case DPM_ORDER_NONE: 3371ffa6a705SCornelia Huck break; 3372ffa6a705SCornelia Huck case DPM_ORDER_DEV_AFTER_PARENT: 3373ffa6a705SCornelia Huck device_pm_move_after(dev, new_parent); 337452cdbdd4SGrygorii Strashko devices_kset_move_after(dev, new_parent); 3375ffa6a705SCornelia Huck break; 3376ffa6a705SCornelia Huck case DPM_ORDER_PARENT_BEFORE_DEV: 3377ffa6a705SCornelia Huck device_pm_move_before(new_parent, dev); 337852cdbdd4SGrygorii Strashko devices_kset_move_before(new_parent, dev); 3379ffa6a705SCornelia Huck break; 3380ffa6a705SCornelia Huck case DPM_ORDER_DEV_LAST: 3381ffa6a705SCornelia Huck device_pm_move_last(dev); 338252cdbdd4SGrygorii Strashko devices_kset_move_last(dev); 3383ffa6a705SCornelia Huck break; 3384ffa6a705SCornelia Huck } 3385bdd4034dSRabin Vincent 33868a82472fSCornelia Huck put_device(old_parent); 33878a82472fSCornelia Huck out: 3388ffa6a705SCornelia Huck device_pm_unlock(); 33898a82472fSCornelia Huck put_device(dev); 33908a82472fSCornelia Huck return error; 33918a82472fSCornelia Huck } 33928a82472fSCornelia Huck EXPORT_SYMBOL_GPL(device_move); 339337b0c020SGreg Kroah-Hartman 339437b0c020SGreg Kroah-Hartman /** 339537b0c020SGreg Kroah-Hartman * device_shutdown - call ->shutdown() on each device to shutdown. 339637b0c020SGreg Kroah-Hartman */ 339737b0c020SGreg Kroah-Hartman void device_shutdown(void) 339837b0c020SGreg Kroah-Hartman { 3399f123db8eSBenson Leung struct device *dev, *parent; 340037b0c020SGreg Kroah-Hartman 34013297c8fcSPingfan Liu wait_for_device_probe(); 34023297c8fcSPingfan Liu device_block_probing(); 34033297c8fcSPingfan Liu 340465650b35SRafael J. Wysocki cpufreq_suspend(); 340565650b35SRafael J. Wysocki 34066245838fSHugh Daschbach spin_lock(&devices_kset->list_lock); 34076245838fSHugh Daschbach /* 34086245838fSHugh Daschbach * Walk the devices list backward, shutting down each in turn. 34096245838fSHugh Daschbach * Beware that device unplug events may also start pulling 34106245838fSHugh Daschbach * devices offline, even as the system is shutting down. 34116245838fSHugh Daschbach */ 34126245838fSHugh Daschbach while (!list_empty(&devices_kset->list)) { 34136245838fSHugh Daschbach dev = list_entry(devices_kset->list.prev, struct device, 34146245838fSHugh Daschbach kobj.entry); 3415d1c6c030SMing Lei 3416d1c6c030SMing Lei /* 3417d1c6c030SMing Lei * hold reference count of device's parent to 3418d1c6c030SMing Lei * prevent it from being freed because parent's 3419d1c6c030SMing Lei * lock is to be held 3420d1c6c030SMing Lei */ 3421f123db8eSBenson Leung parent = get_device(dev->parent); 34226245838fSHugh Daschbach get_device(dev); 34236245838fSHugh Daschbach /* 34246245838fSHugh Daschbach * Make sure the device is off the kset list, in the 34256245838fSHugh Daschbach * event that dev->*->shutdown() doesn't remove it. 34266245838fSHugh Daschbach */ 34276245838fSHugh Daschbach list_del_init(&dev->kobj.entry); 34286245838fSHugh Daschbach spin_unlock(&devices_kset->list_lock); 3429fe6b91f4SAlan Stern 3430d1c6c030SMing Lei /* hold lock to avoid race with probe/release */ 3431f123db8eSBenson Leung if (parent) 3432f123db8eSBenson Leung device_lock(parent); 3433d1c6c030SMing Lei device_lock(dev); 3434d1c6c030SMing Lei 3435fe6b91f4SAlan Stern /* Don't allow any more runtime suspends */ 3436fe6b91f4SAlan Stern pm_runtime_get_noresume(dev); 3437fe6b91f4SAlan Stern pm_runtime_barrier(dev); 34386245838fSHugh Daschbach 34397521621eSMichal Suchanek if (dev->class && dev->class->shutdown_pre) { 3440f77af151SJosh Zimmerman if (initcall_debug) 34417521621eSMichal Suchanek dev_info(dev, "shutdown_pre\n"); 34427521621eSMichal Suchanek dev->class->shutdown_pre(dev); 34437521621eSMichal Suchanek } 34447521621eSMichal Suchanek if (dev->bus && dev->bus->shutdown) { 34450246c4faSShuoX Liu if (initcall_debug) 34460246c4faSShuoX Liu dev_info(dev, "shutdown\n"); 344737b0c020SGreg Kroah-Hartman dev->bus->shutdown(dev); 344837b0c020SGreg Kroah-Hartman } else if (dev->driver && dev->driver->shutdown) { 34490246c4faSShuoX Liu if (initcall_debug) 34500246c4faSShuoX Liu dev_info(dev, "shutdown\n"); 345137b0c020SGreg Kroah-Hartman dev->driver->shutdown(dev); 345237b0c020SGreg Kroah-Hartman } 3453d1c6c030SMing Lei 3454d1c6c030SMing Lei device_unlock(dev); 3455f123db8eSBenson Leung if (parent) 3456f123db8eSBenson Leung device_unlock(parent); 3457d1c6c030SMing Lei 34586245838fSHugh Daschbach put_device(dev); 3459f123db8eSBenson Leung put_device(parent); 34606245838fSHugh Daschbach 34616245838fSHugh Daschbach spin_lock(&devices_kset->list_lock); 346237b0c020SGreg Kroah-Hartman } 34636245838fSHugh Daschbach spin_unlock(&devices_kset->list_lock); 346437b0c020SGreg Kroah-Hartman } 346599bcf217SJoe Perches 346699bcf217SJoe Perches /* 346799bcf217SJoe Perches * Device logging functions 346899bcf217SJoe Perches */ 346999bcf217SJoe Perches 347099bcf217SJoe Perches #ifdef CONFIG_PRINTK 3471666f355fSJoe Perches static int 3472666f355fSJoe Perches create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) 347399bcf217SJoe Perches { 3474c4e00daaSKay Sievers const char *subsys; 3475798efc60SJoe Perches size_t pos = 0; 347699bcf217SJoe Perches 3477c4e00daaSKay Sievers if (dev->class) 3478c4e00daaSKay Sievers subsys = dev->class->name; 3479c4e00daaSKay Sievers else if (dev->bus) 3480c4e00daaSKay Sievers subsys = dev->bus->name; 3481c4e00daaSKay Sievers else 3482798efc60SJoe Perches return 0; 3483c4e00daaSKay Sievers 3484798efc60SJoe Perches pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); 3485655e5b7cSBen Hutchings if (pos >= hdrlen) 3486655e5b7cSBen Hutchings goto overflow; 3487c4e00daaSKay Sievers 3488c4e00daaSKay Sievers /* 3489c4e00daaSKay Sievers * Add device identifier DEVICE=: 3490c4e00daaSKay Sievers * b12:8 block dev_t 3491c4e00daaSKay Sievers * c127:3 char dev_t 3492c4e00daaSKay Sievers * n8 netdev ifindex 3493c4e00daaSKay Sievers * +sound:card0 subsystem:devname 3494c4e00daaSKay Sievers */ 3495c4e00daaSKay Sievers if (MAJOR(dev->devt)) { 3496c4e00daaSKay Sievers char c; 3497c4e00daaSKay Sievers 3498c4e00daaSKay Sievers if (strcmp(subsys, "block") == 0) 3499c4e00daaSKay Sievers c = 'b'; 3500c4e00daaSKay Sievers else 3501c4e00daaSKay Sievers c = 'c'; 3502798efc60SJoe Perches pos++; 3503798efc60SJoe Perches pos += snprintf(hdr + pos, hdrlen - pos, 3504c4e00daaSKay Sievers "DEVICE=%c%u:%u", 3505c4e00daaSKay Sievers c, MAJOR(dev->devt), MINOR(dev->devt)); 3506c4e00daaSKay Sievers } else if (strcmp(subsys, "net") == 0) { 3507c4e00daaSKay Sievers struct net_device *net = to_net_dev(dev); 3508c4e00daaSKay Sievers 3509798efc60SJoe Perches pos++; 3510798efc60SJoe Perches pos += snprintf(hdr + pos, hdrlen - pos, 3511c4e00daaSKay Sievers "DEVICE=n%u", net->ifindex); 3512c4e00daaSKay Sievers } else { 3513798efc60SJoe Perches pos++; 3514798efc60SJoe Perches pos += snprintf(hdr + pos, hdrlen - pos, 3515c4e00daaSKay Sievers "DEVICE=+%s:%s", subsys, dev_name(dev)); 3516c4e00daaSKay Sievers } 3517af7f2158SJim Cromie 3518655e5b7cSBen Hutchings if (pos >= hdrlen) 3519655e5b7cSBen Hutchings goto overflow; 3520655e5b7cSBen Hutchings 3521798efc60SJoe Perches return pos; 3522655e5b7cSBen Hutchings 3523655e5b7cSBen Hutchings overflow: 3524655e5b7cSBen Hutchings dev_WARN(dev, "device/subsystem name too long"); 3525655e5b7cSBen Hutchings return 0; 352699bcf217SJoe Perches } 3527798efc60SJoe Perches 352805e4e5b8SJoe Perches int dev_vprintk_emit(int level, const struct device *dev, 352905e4e5b8SJoe Perches const char *fmt, va_list args) 353005e4e5b8SJoe Perches { 353105e4e5b8SJoe Perches char hdr[128]; 353205e4e5b8SJoe Perches size_t hdrlen; 353305e4e5b8SJoe Perches 353405e4e5b8SJoe Perches hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); 353505e4e5b8SJoe Perches 353605e4e5b8SJoe Perches return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); 353705e4e5b8SJoe Perches } 353805e4e5b8SJoe Perches EXPORT_SYMBOL(dev_vprintk_emit); 353905e4e5b8SJoe Perches 354005e4e5b8SJoe Perches int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) 354105e4e5b8SJoe Perches { 354205e4e5b8SJoe Perches va_list args; 354305e4e5b8SJoe Perches int r; 354405e4e5b8SJoe Perches 354505e4e5b8SJoe Perches va_start(args, fmt); 354605e4e5b8SJoe Perches 354705e4e5b8SJoe Perches r = dev_vprintk_emit(level, dev, fmt, args); 354805e4e5b8SJoe Perches 354905e4e5b8SJoe Perches va_end(args); 355005e4e5b8SJoe Perches 355105e4e5b8SJoe Perches return r; 355205e4e5b8SJoe Perches } 355305e4e5b8SJoe Perches EXPORT_SYMBOL(dev_printk_emit); 355405e4e5b8SJoe Perches 3555d1f1052cSJoe Perches static void __dev_printk(const char *level, const struct device *dev, 3556798efc60SJoe Perches struct va_format *vaf) 3557798efc60SJoe Perches { 3558d1f1052cSJoe Perches if (dev) 3559d1f1052cSJoe Perches dev_printk_emit(level[1] - '0', dev, "%s %s: %pV", 3560798efc60SJoe Perches dev_driver_string(dev), dev_name(dev), vaf); 3561d1f1052cSJoe Perches else 3562d1f1052cSJoe Perches printk("%s(NULL device *): %pV", level, vaf); 3563798efc60SJoe Perches } 356499bcf217SJoe Perches 3565d1f1052cSJoe Perches void dev_printk(const char *level, const struct device *dev, 356699bcf217SJoe Perches const char *fmt, ...) 356799bcf217SJoe Perches { 356899bcf217SJoe Perches struct va_format vaf; 356999bcf217SJoe Perches va_list args; 357099bcf217SJoe Perches 357199bcf217SJoe Perches va_start(args, fmt); 357299bcf217SJoe Perches 357399bcf217SJoe Perches vaf.fmt = fmt; 357499bcf217SJoe Perches vaf.va = &args; 357599bcf217SJoe Perches 3576d1f1052cSJoe Perches __dev_printk(level, dev, &vaf); 3577798efc60SJoe Perches 357899bcf217SJoe Perches va_end(args); 357999bcf217SJoe Perches } 358099bcf217SJoe Perches EXPORT_SYMBOL(dev_printk); 358199bcf217SJoe Perches 358299bcf217SJoe Perches #define define_dev_printk_level(func, kern_level) \ 3583d1f1052cSJoe Perches void func(const struct device *dev, const char *fmt, ...) \ 358499bcf217SJoe Perches { \ 358599bcf217SJoe Perches struct va_format vaf; \ 358699bcf217SJoe Perches va_list args; \ 358799bcf217SJoe Perches \ 358899bcf217SJoe Perches va_start(args, fmt); \ 358999bcf217SJoe Perches \ 359099bcf217SJoe Perches vaf.fmt = fmt; \ 359199bcf217SJoe Perches vaf.va = &args; \ 359299bcf217SJoe Perches \ 3593d1f1052cSJoe Perches __dev_printk(kern_level, dev, &vaf); \ 3594798efc60SJoe Perches \ 359599bcf217SJoe Perches va_end(args); \ 359699bcf217SJoe Perches } \ 359799bcf217SJoe Perches EXPORT_SYMBOL(func); 359899bcf217SJoe Perches 3599663336eeSJoe Perches define_dev_printk_level(_dev_emerg, KERN_EMERG); 3600663336eeSJoe Perches define_dev_printk_level(_dev_alert, KERN_ALERT); 3601663336eeSJoe Perches define_dev_printk_level(_dev_crit, KERN_CRIT); 3602663336eeSJoe Perches define_dev_printk_level(_dev_err, KERN_ERR); 3603663336eeSJoe Perches define_dev_printk_level(_dev_warn, KERN_WARNING); 3604663336eeSJoe Perches define_dev_printk_level(_dev_notice, KERN_NOTICE); 360599bcf217SJoe Perches define_dev_printk_level(_dev_info, KERN_INFO); 360699bcf217SJoe Perches 360799bcf217SJoe Perches #endif 360897badf87SRafael J. Wysocki 360997badf87SRafael J. Wysocki static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) 361097badf87SRafael J. Wysocki { 361197badf87SRafael J. Wysocki return fwnode && !IS_ERR(fwnode->secondary); 361297badf87SRafael J. Wysocki } 361397badf87SRafael J. Wysocki 361497badf87SRafael J. Wysocki /** 361597badf87SRafael J. Wysocki * set_primary_fwnode - Change the primary firmware node of a given device. 361697badf87SRafael J. Wysocki * @dev: Device to handle. 361797badf87SRafael J. Wysocki * @fwnode: New primary firmware node of the device. 361897badf87SRafael J. Wysocki * 361997badf87SRafael J. Wysocki * Set the device's firmware node pointer to @fwnode, but if a secondary 362097badf87SRafael J. Wysocki * firmware node of the device is present, preserve it. 362197badf87SRafael J. Wysocki */ 362297badf87SRafael J. Wysocki void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) 362397badf87SRafael J. Wysocki { 362497badf87SRafael J. Wysocki if (fwnode) { 362597badf87SRafael J. Wysocki struct fwnode_handle *fn = dev->fwnode; 362697badf87SRafael J. Wysocki 362797badf87SRafael J. Wysocki if (fwnode_is_primary(fn)) 362897badf87SRafael J. Wysocki fn = fn->secondary; 362997badf87SRafael J. Wysocki 363055f89a8aSMika Westerberg if (fn) { 363155f89a8aSMika Westerberg WARN_ON(fwnode->secondary); 363297badf87SRafael J. Wysocki fwnode->secondary = fn; 363355f89a8aSMika Westerberg } 363497badf87SRafael J. Wysocki dev->fwnode = fwnode; 363597badf87SRafael J. Wysocki } else { 363697badf87SRafael J. Wysocki dev->fwnode = fwnode_is_primary(dev->fwnode) ? 363797badf87SRafael J. Wysocki dev->fwnode->secondary : NULL; 363897badf87SRafael J. Wysocki } 363997badf87SRafael J. Wysocki } 364097badf87SRafael J. Wysocki EXPORT_SYMBOL_GPL(set_primary_fwnode); 364197badf87SRafael J. Wysocki 364297badf87SRafael J. Wysocki /** 364397badf87SRafael J. Wysocki * set_secondary_fwnode - Change the secondary firmware node of a given device. 364497badf87SRafael J. Wysocki * @dev: Device to handle. 364597badf87SRafael J. Wysocki * @fwnode: New secondary firmware node of the device. 364697badf87SRafael J. Wysocki * 364797badf87SRafael J. Wysocki * If a primary firmware node of the device is present, set its secondary 364897badf87SRafael J. Wysocki * pointer to @fwnode. Otherwise, set the device's firmware node pointer to 364997badf87SRafael J. Wysocki * @fwnode. 365097badf87SRafael J. Wysocki */ 365197badf87SRafael J. Wysocki void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode) 365297badf87SRafael J. Wysocki { 365397badf87SRafael J. Wysocki if (fwnode) 365497badf87SRafael J. Wysocki fwnode->secondary = ERR_PTR(-ENODEV); 365597badf87SRafael J. Wysocki 365697badf87SRafael J. Wysocki if (fwnode_is_primary(dev->fwnode)) 365797badf87SRafael J. Wysocki dev->fwnode->secondary = fwnode; 365897badf87SRafael J. Wysocki else 365997badf87SRafael J. Wysocki dev->fwnode = fwnode; 366097badf87SRafael J. Wysocki } 36614e75e1d7SJohan Hovold 36624e75e1d7SJohan Hovold /** 36634e75e1d7SJohan Hovold * device_set_of_node_from_dev - reuse device-tree node of another device 36644e75e1d7SJohan Hovold * @dev: device whose device-tree node is being set 36654e75e1d7SJohan Hovold * @dev2: device whose device-tree node is being reused 36664e75e1d7SJohan Hovold * 36674e75e1d7SJohan Hovold * Takes another reference to the new device-tree node after first dropping 36684e75e1d7SJohan Hovold * any reference held to the old node. 36694e75e1d7SJohan Hovold */ 36704e75e1d7SJohan Hovold void device_set_of_node_from_dev(struct device *dev, const struct device *dev2) 36714e75e1d7SJohan Hovold { 36724e75e1d7SJohan Hovold of_node_put(dev->of_node); 36734e75e1d7SJohan Hovold dev->of_node = of_node_get(dev2->of_node); 36744e75e1d7SJohan Hovold dev->of_node_reused = true; 36754e75e1d7SJohan Hovold } 36764e75e1d7SJohan Hovold EXPORT_SYMBOL_GPL(device_set_of_node_from_dev); 367765b66682SSuzuki K Poulose 36786cda08a2SSuzuki K Poulose int device_match_name(struct device *dev, const void *name) 36796cda08a2SSuzuki K Poulose { 36806cda08a2SSuzuki K Poulose return sysfs_streq(dev_name(dev), name); 36816cda08a2SSuzuki K Poulose } 36826cda08a2SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_name); 36836cda08a2SSuzuki K Poulose 368465b66682SSuzuki K Poulose int device_match_of_node(struct device *dev, const void *np) 368565b66682SSuzuki K Poulose { 368665b66682SSuzuki K Poulose return dev->of_node == np; 368765b66682SSuzuki K Poulose } 368865b66682SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_of_node); 368967843bbaSSuzuki K Poulose 369067843bbaSSuzuki K Poulose int device_match_fwnode(struct device *dev, const void *fwnode) 369167843bbaSSuzuki K Poulose { 369267843bbaSSuzuki K Poulose return dev_fwnode(dev) == fwnode; 369367843bbaSSuzuki K Poulose } 369467843bbaSSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_fwnode); 36954495dfddSSuzuki K Poulose 36964495dfddSSuzuki K Poulose int device_match_devt(struct device *dev, const void *pdevt) 36974495dfddSSuzuki K Poulose { 36984495dfddSSuzuki K Poulose return dev->devt == *(dev_t *)pdevt; 36994495dfddSSuzuki K Poulose } 37004495dfddSSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_devt); 370100500147SSuzuki K Poulose 370200500147SSuzuki K Poulose int device_match_acpi_dev(struct device *dev, const void *adev) 370300500147SSuzuki K Poulose { 370400500147SSuzuki K Poulose return ACPI_COMPANION(dev) == adev; 370500500147SSuzuki K Poulose } 370600500147SSuzuki K Poulose EXPORT_SYMBOL(device_match_acpi_dev); 37076bf85ba9SSuzuki K Poulose 37086bf85ba9SSuzuki K Poulose int device_match_any(struct device *dev, const void *unused) 37096bf85ba9SSuzuki K Poulose { 37106bf85ba9SSuzuki K Poulose return 1; 37116bf85ba9SSuzuki K Poulose } 37126bf85ba9SSuzuki K Poulose EXPORT_SYMBOL_GPL(device_match_any); 3713