1c8f7a62cSLen Brown /* 2c8f7a62cSLen Brown * dock.c - ACPI dock station driver 3c8f7a62cSLen Brown * 4c8f7a62cSLen Brown * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> 5c8f7a62cSLen Brown * 6c8f7a62cSLen Brown * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7c8f7a62cSLen Brown * 8c8f7a62cSLen Brown * This program is free software; you can redistribute it and/or modify 9c8f7a62cSLen Brown * it under the terms of the GNU General Public License as published by 10c8f7a62cSLen Brown * the Free Software Foundation; either version 2 of the License, or (at 11c8f7a62cSLen Brown * your option) any later version. 12c8f7a62cSLen Brown * 13c8f7a62cSLen Brown * This program is distributed in the hope that it will be useful, but 14c8f7a62cSLen Brown * WITHOUT ANY WARRANTY; without even the implied warranty of 15c8f7a62cSLen Brown * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16c8f7a62cSLen Brown * General Public License for more details. 17c8f7a62cSLen Brown * 18c8f7a62cSLen Brown * You should have received a copy of the GNU General Public License along 19c8f7a62cSLen Brown * with this program; if not, write to the Free Software Foundation, Inc., 20c8f7a62cSLen Brown * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21c8f7a62cSLen Brown * 22c8f7a62cSLen Brown * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23c8f7a62cSLen Brown */ 24c8f7a62cSLen Brown 25c8f7a62cSLen Brown #include <linux/kernel.h> 26c8f7a62cSLen Brown #include <linux/module.h> 275a0e3ad6STejun Heo #include <linux/slab.h> 28c8f7a62cSLen Brown #include <linux/init.h> 29c8f7a62cSLen Brown #include <linux/types.h> 30c8f7a62cSLen Brown #include <linux/notifier.h> 31671adbecSKristen Carlson Accardi #include <linux/platform_device.h> 32914e2637SAl Viro #include <linux/jiffies.h> 3362a6d7fdSRandy Dunlap #include <linux/stddef.h> 34cd73018fSToshi Kani #include <linux/acpi.h> 35c8f7a62cSLen Brown #include <acpi/acpi_bus.h> 36c8f7a62cSLen Brown #include <acpi/acpi_drivers.h> 37c8f7a62cSLen Brown 38a192a958SLen Brown #define PREFIX "ACPI: " 39a192a958SLen Brown 407cda93e0SLen Brown #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" 41c8f7a62cSLen Brown 42f52fd66dSLen Brown ACPI_MODULE_NAME("dock"); 43c8f7a62cSLen Brown MODULE_AUTHOR("Kristen Carlson Accardi"); 447cda93e0SLen Brown MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); 45c8f7a62cSLen Brown MODULE_LICENSE("GPL"); 46c8f7a62cSLen Brown 4790ab5ee9SRusty Russell static bool immediate_undock = 1; 48a0cd35fdSKristen Carlson Accardi module_param(immediate_undock, bool, 0644); 49a0cd35fdSKristen Carlson Accardi MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " 50a0cd35fdSKristen Carlson Accardi "undock immediately when the undock button is pressed, 0 will cause" 51a0cd35fdSKristen Carlson Accardi " the driver to wait for userspace to write the undock sysfs file " 52a0cd35fdSKristen Carlson Accardi " before undocking"); 53a0cd35fdSKristen Carlson Accardi 54c8f7a62cSLen Brown static struct atomic_notifier_head dock_notifier_list; 55c8f7a62cSLen Brown 56a340af14SFrank Seidel static const struct acpi_device_id dock_device_ids[] = { 57a340af14SFrank Seidel {"LNXDOCK", 0}, 58a340af14SFrank Seidel {"", 0}, 59a340af14SFrank Seidel }; 60a340af14SFrank Seidel MODULE_DEVICE_TABLE(acpi, dock_device_ids); 61a340af14SFrank Seidel 62c8f7a62cSLen Brown struct dock_station { 63c8f7a62cSLen Brown acpi_handle handle; 64c8f7a62cSLen Brown unsigned long last_dock_time; 65c8f7a62cSLen Brown u32 flags; 668b0dc866SKristen Carlson Accardi struct mutex hp_lock; 67c8f7a62cSLen Brown struct list_head dependent_devices; 68db350b08SShaohua Li 6950d716e4SAlex Chiang struct list_head sibling; 70db350b08SShaohua Li struct platform_device *dock_device; 71c8f7a62cSLen Brown }; 72db350b08SShaohua Li static LIST_HEAD(dock_stations); 73db350b08SShaohua Li static int dock_station_count; 7421a31013SRafael J. Wysocki static DEFINE_MUTEX(hotplug_lock); 75c8f7a62cSLen Brown 76c8f7a62cSLen Brown struct dock_dependent_device { 77c8f7a62cSLen Brown struct list_head list; 78c8f7a62cSLen Brown acpi_handle handle; 7921a31013SRafael J. Wysocki const struct acpi_dock_ops *hp_ops; 8021a31013SRafael J. Wysocki void *hp_context; 8121a31013SRafael J. Wysocki unsigned int hp_refcount; 8221a31013SRafael J. Wysocki void (*hp_release)(void *); 83c8f7a62cSLen Brown }; 84c8f7a62cSLen Brown 85c8f7a62cSLen Brown #define DOCK_DOCKING 0x00000001 86a0cd35fdSKristen Carlson Accardi #define DOCK_UNDOCKING 0x00000002 87db350b08SShaohua Li #define DOCK_IS_DOCK 0x00000010 88db350b08SShaohua Li #define DOCK_IS_ATA 0x00000020 89db350b08SShaohua Li #define DOCK_IS_BAT 0x00000040 905669021eSKristen Carlson Accardi #define DOCK_EVENT 3 915669021eSKristen Carlson Accardi #define UNDOCK_EVENT 2 92c8f7a62cSLen Brown 93c8f7a62cSLen Brown /***************************************************************************** 94c8f7a62cSLen Brown * Dock Dependent device functions * 95c8f7a62cSLen Brown *****************************************************************************/ 96c8f7a62cSLen Brown /** 97f69cfdd2SAlex Chiang * add_dock_dependent_device - associate a device with the dock station 98f69cfdd2SAlex Chiang * @ds: The dock station 99f69cfdd2SAlex Chiang * @handle: handle of the dependent device 100c8f7a62cSLen Brown * 101f69cfdd2SAlex Chiang * Add the dependent device to the dock's dependent device list. 102c8f7a62cSLen Brown */ 103d423c083SJiang Liu static int __init 104f69cfdd2SAlex Chiang add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) 105c8f7a62cSLen Brown { 106c8f7a62cSLen Brown struct dock_dependent_device *dd; 107c8f7a62cSLen Brown 108c8f7a62cSLen Brown dd = kzalloc(sizeof(*dd), GFP_KERNEL); 109f69cfdd2SAlex Chiang if (!dd) 110f69cfdd2SAlex Chiang return -ENOMEM; 111f69cfdd2SAlex Chiang 112c8f7a62cSLen Brown dd->handle = handle; 113c8f7a62cSLen Brown INIT_LIST_HEAD(&dd->list); 114c8f7a62cSLen Brown list_add_tail(&dd->list, &ds->dependent_devices); 115f69cfdd2SAlex Chiang 116f69cfdd2SAlex Chiang return 0; 117c8f7a62cSLen Brown } 118c8f7a62cSLen Brown 119c8f7a62cSLen Brown /** 12021a31013SRafael J. Wysocki * dock_init_hotplug - Initialize a hotplug device on a docking station. 12121a31013SRafael J. Wysocki * @dd: Dock-dependent device. 12221a31013SRafael J. Wysocki * @ops: Dock operations to attach to the dependent device. 12321a31013SRafael J. Wysocki * @context: Data to pass to the @ops callbacks and @release. 12421a31013SRafael J. Wysocki * @init: Optional initialization routine to run after setting up context. 12521a31013SRafael J. Wysocki * @release: Optional release routine to run on removal. 126c8f7a62cSLen Brown */ 12721a31013SRafael J. Wysocki static int dock_init_hotplug(struct dock_dependent_device *dd, 12821a31013SRafael J. Wysocki const struct acpi_dock_ops *ops, void *context, 12921a31013SRafael J. Wysocki void (*init)(void *), void (*release)(void *)) 130c8f7a62cSLen Brown { 13121a31013SRafael J. Wysocki int ret = 0; 13221a31013SRafael J. Wysocki 13321a31013SRafael J. Wysocki mutex_lock(&hotplug_lock); 13421a31013SRafael J. Wysocki 13521a31013SRafael J. Wysocki if (dd->hp_context) { 13621a31013SRafael J. Wysocki ret = -EEXIST; 13721a31013SRafael J. Wysocki } else { 13821a31013SRafael J. Wysocki dd->hp_refcount = 1; 13921a31013SRafael J. Wysocki dd->hp_ops = ops; 14021a31013SRafael J. Wysocki dd->hp_context = context; 14121a31013SRafael J. Wysocki dd->hp_release = release; 14221a31013SRafael J. Wysocki } 14321a31013SRafael J. Wysocki 14421a31013SRafael J. Wysocki if (!WARN_ON(ret) && init) 14521a31013SRafael J. Wysocki init(context); 14621a31013SRafael J. Wysocki 14721a31013SRafael J. Wysocki mutex_unlock(&hotplug_lock); 14821a31013SRafael J. Wysocki return ret; 149c8f7a62cSLen Brown } 150c8f7a62cSLen Brown 151c8f7a62cSLen Brown /** 15221a31013SRafael J. Wysocki * dock_release_hotplug - Decrement hotplug reference counter of dock device. 15321a31013SRafael J. Wysocki * @dd: Dock-dependent device. 154c8f7a62cSLen Brown * 15521a31013SRafael J. Wysocki * Decrement the reference counter of @dd and if 0, detach its hotplug 15621a31013SRafael J. Wysocki * operations from it, reset its context pointer and run the optional release 15721a31013SRafael J. Wysocki * routine if present. 158c8f7a62cSLen Brown */ 15921a31013SRafael J. Wysocki static void dock_release_hotplug(struct dock_dependent_device *dd) 160c8f7a62cSLen Brown { 16121a31013SRafael J. Wysocki void (*release)(void *) = NULL; 16221a31013SRafael J. Wysocki void *context = NULL; 16321a31013SRafael J. Wysocki 16421a31013SRafael J. Wysocki mutex_lock(&hotplug_lock); 16521a31013SRafael J. Wysocki 16621a31013SRafael J. Wysocki if (dd->hp_context && !--dd->hp_refcount) { 16721a31013SRafael J. Wysocki dd->hp_ops = NULL; 16821a31013SRafael J. Wysocki context = dd->hp_context; 16921a31013SRafael J. Wysocki dd->hp_context = NULL; 17021a31013SRafael J. Wysocki release = dd->hp_release; 17121a31013SRafael J. Wysocki dd->hp_release = NULL; 17221a31013SRafael J. Wysocki } 17321a31013SRafael J. Wysocki 17421a31013SRafael J. Wysocki if (release && context) 17521a31013SRafael J. Wysocki release(context); 17621a31013SRafael J. Wysocki 17721a31013SRafael J. Wysocki mutex_unlock(&hotplug_lock); 17821a31013SRafael J. Wysocki } 17921a31013SRafael J. Wysocki 18021a31013SRafael J. Wysocki static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, 18121a31013SRafael J. Wysocki bool uevent) 18221a31013SRafael J. Wysocki { 18321a31013SRafael J. Wysocki acpi_notify_handler cb = NULL; 18421a31013SRafael J. Wysocki bool run = false; 18521a31013SRafael J. Wysocki 18621a31013SRafael J. Wysocki mutex_lock(&hotplug_lock); 18721a31013SRafael J. Wysocki 18821a31013SRafael J. Wysocki if (dd->hp_context) { 18921a31013SRafael J. Wysocki run = true; 19021a31013SRafael J. Wysocki dd->hp_refcount++; 19121a31013SRafael J. Wysocki if (dd->hp_ops) 19221a31013SRafael J. Wysocki cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler; 19321a31013SRafael J. Wysocki } 19421a31013SRafael J. Wysocki 19521a31013SRafael J. Wysocki mutex_unlock(&hotplug_lock); 19621a31013SRafael J. Wysocki 19721a31013SRafael J. Wysocki if (!run) 19821a31013SRafael J. Wysocki return; 19921a31013SRafael J. Wysocki 20021a31013SRafael J. Wysocki if (cb) 20121a31013SRafael J. Wysocki cb(dd->handle, event, dd->hp_context); 20221a31013SRafael J. Wysocki 20321a31013SRafael J. Wysocki dock_release_hotplug(dd); 204c8f7a62cSLen Brown } 205c8f7a62cSLen Brown 206c8f7a62cSLen Brown /** 207c8f7a62cSLen Brown * find_dock_dependent_device - get a device dependent on this dock 208c8f7a62cSLen Brown * @ds: the dock station 209c8f7a62cSLen Brown * @handle: the acpi_handle of the device we want 210c8f7a62cSLen Brown * 211c8f7a62cSLen Brown * iterate over the dependent device list for this dock. If the 212c8f7a62cSLen Brown * dependent device matches the handle, return. 213c8f7a62cSLen Brown */ 214c8f7a62cSLen Brown static struct dock_dependent_device * 215c8f7a62cSLen Brown find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) 216c8f7a62cSLen Brown { 217c8f7a62cSLen Brown struct dock_dependent_device *dd; 218c8f7a62cSLen Brown 219ed633e70SJiang Liu list_for_each_entry(dd, &ds->dependent_devices, list) 220ed633e70SJiang Liu if (handle == dd->handle) 221c8f7a62cSLen Brown return dd; 222ed633e70SJiang Liu 223c8f7a62cSLen Brown return NULL; 224c8f7a62cSLen Brown } 225c8f7a62cSLen Brown 226c8f7a62cSLen Brown /***************************************************************************** 227c8f7a62cSLen Brown * Dock functions * 228c8f7a62cSLen Brown *****************************************************************************/ 229c8f7a62cSLen Brown /** 230c8f7a62cSLen Brown * is_dock - see if a device is a dock station 231c8f7a62cSLen Brown * @handle: acpi handle of the device 232c8f7a62cSLen Brown * 233c8f7a62cSLen Brown * If an acpi object has a _DCK method, then it is by definition a dock 234c8f7a62cSLen Brown * station, so return true. 235c8f7a62cSLen Brown */ 236c8f7a62cSLen Brown static int is_dock(acpi_handle handle) 237c8f7a62cSLen Brown { 238c8f7a62cSLen Brown acpi_status status; 239c8f7a62cSLen Brown acpi_handle tmp; 240c8f7a62cSLen Brown 241c8f7a62cSLen Brown status = acpi_get_handle(handle, "_DCK", &tmp); 242c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 243c8f7a62cSLen Brown return 0; 244c8f7a62cSLen Brown return 1; 245c8f7a62cSLen Brown } 246c8f7a62cSLen Brown 247d423c083SJiang Liu static int __init is_ejectable(acpi_handle handle) 248db350b08SShaohua Li { 249db350b08SShaohua Li acpi_status status; 250db350b08SShaohua Li acpi_handle tmp; 251db350b08SShaohua Li 252db350b08SShaohua Li status = acpi_get_handle(handle, "_EJ0", &tmp); 253db350b08SShaohua Li if (ACPI_FAILURE(status)) 254db350b08SShaohua Li return 0; 255db350b08SShaohua Li return 1; 256db350b08SShaohua Li } 257db350b08SShaohua Li 258d423c083SJiang Liu static int __init is_ata(acpi_handle handle) 259db350b08SShaohua Li { 260db350b08SShaohua Li acpi_handle tmp; 261db350b08SShaohua Li 262db350b08SShaohua Li if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || 263db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || 264db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || 265db350b08SShaohua Li (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) 266db350b08SShaohua Li return 1; 267db350b08SShaohua Li 268db350b08SShaohua Li return 0; 269db350b08SShaohua Li } 270db350b08SShaohua Li 271d423c083SJiang Liu static int __init is_battery(acpi_handle handle) 272db350b08SShaohua Li { 273db350b08SShaohua Li struct acpi_device_info *info; 274db350b08SShaohua Li int ret = 1; 275db350b08SShaohua Li 27615b8dd53SBob Moore if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) 277db350b08SShaohua Li return 0; 278db350b08SShaohua Li if (!(info->valid & ACPI_VALID_HID)) 279db350b08SShaohua Li ret = 0; 280db350b08SShaohua Li else 28115b8dd53SBob Moore ret = !strcmp("PNP0C0A", info->hardware_id.string); 282db350b08SShaohua Li 28315b8dd53SBob Moore kfree(info); 284db350b08SShaohua Li return ret; 285db350b08SShaohua Li } 286db350b08SShaohua Li 287d423c083SJiang Liu static int __init is_ejectable_bay(acpi_handle handle) 288db350b08SShaohua Li { 289db350b08SShaohua Li acpi_handle phandle; 290747479a3SAlex Chiang 291db350b08SShaohua Li if (!is_ejectable(handle)) 292db350b08SShaohua Li return 0; 293db350b08SShaohua Li if (is_battery(handle) || is_ata(handle)) 294db350b08SShaohua Li return 1; 295db350b08SShaohua Li if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) 296db350b08SShaohua Li return 1; 297db350b08SShaohua Li return 0; 298db350b08SShaohua Li } 299db350b08SShaohua Li 300c8f7a62cSLen Brown /** 301c8f7a62cSLen Brown * is_dock_device - see if a device is on a dock station 302c8f7a62cSLen Brown * @handle: acpi handle of the device 303c8f7a62cSLen Brown * 304c8f7a62cSLen Brown * If this device is either the dock station itself, 305c8f7a62cSLen Brown * or is a device dependent on the dock station, then it 306c8f7a62cSLen Brown * is a dock device 307c8f7a62cSLen Brown */ 308c8f7a62cSLen Brown int is_dock_device(acpi_handle handle) 309c8f7a62cSLen Brown { 310db350b08SShaohua Li struct dock_station *dock_station; 311db350b08SShaohua Li 312db350b08SShaohua Li if (!dock_station_count) 313c8f7a62cSLen Brown return 0; 314c8f7a62cSLen Brown 315db350b08SShaohua Li if (is_dock(handle)) 316c8f7a62cSLen Brown return 1; 317747479a3SAlex Chiang 318747479a3SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) 319db350b08SShaohua Li if (find_dock_dependent_device(dock_station, handle)) 320db350b08SShaohua Li return 1; 321c8f7a62cSLen Brown 322c8f7a62cSLen Brown return 0; 323c8f7a62cSLen Brown } 324c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(is_dock_device); 325c8f7a62cSLen Brown 326c8f7a62cSLen Brown /** 327c8f7a62cSLen Brown * dock_present - see if the dock station is present. 328c8f7a62cSLen Brown * @ds: the dock station 329c8f7a62cSLen Brown * 330c8f7a62cSLen Brown * execute the _STA method. note that present does not 331c8f7a62cSLen Brown * imply that we are docked. 332c8f7a62cSLen Brown */ 333c8f7a62cSLen Brown static int dock_present(struct dock_station *ds) 334c8f7a62cSLen Brown { 33527663c58SMatthew Wilcox unsigned long long sta; 336c8f7a62cSLen Brown acpi_status status; 337c8f7a62cSLen Brown 338c8f7a62cSLen Brown if (ds) { 339c8f7a62cSLen Brown status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); 340c8f7a62cSLen Brown if (ACPI_SUCCESS(status) && sta) 341c8f7a62cSLen Brown return 1; 342c8f7a62cSLen Brown } 343c8f7a62cSLen Brown return 0; 344c8f7a62cSLen Brown } 345c8f7a62cSLen Brown 346c8f7a62cSLen Brown /** 347c8f7a62cSLen Brown * dock_create_acpi_device - add new devices to acpi 348c8f7a62cSLen Brown * @handle - handle of the device to add 349c8f7a62cSLen Brown * 350c8f7a62cSLen Brown * This function will create a new acpi_device for the given 351c8f7a62cSLen Brown * handle if one does not exist already. This should cause 352c8f7a62cSLen Brown * acpi to scan for drivers for the given devices, and call 353c8f7a62cSLen Brown * matching driver's add routine. 354c8f7a62cSLen Brown */ 355472d963bSJiang Liu static void dock_create_acpi_device(acpi_handle handle) 356c8f7a62cSLen Brown { 357747479a3SAlex Chiang struct acpi_device *device; 358c8f7a62cSLen Brown int ret; 359c8f7a62cSLen Brown 360c8f7a62cSLen Brown if (acpi_bus_get_device(handle, &device)) { 361c8f7a62cSLen Brown /* 362c8f7a62cSLen Brown * no device created for this object, 363c8f7a62cSLen Brown * so we should create one. 364c8f7a62cSLen Brown */ 365b8bd759aSRafael J. Wysocki ret = acpi_bus_scan(handle); 366636458deSRafael J. Wysocki if (ret) 367747479a3SAlex Chiang pr_debug("error adding bus, %x\n", -ret); 368c8f7a62cSLen Brown } 369c8f7a62cSLen Brown } 370c8f7a62cSLen Brown 371c8f7a62cSLen Brown /** 372c8f7a62cSLen Brown * dock_remove_acpi_device - remove the acpi_device struct from acpi 373c8f7a62cSLen Brown * @handle - the handle of the device to remove 374c8f7a62cSLen Brown * 375c8f7a62cSLen Brown * Tell acpi to remove the acpi_device. This should cause any loaded 376c8f7a62cSLen Brown * driver to have it's remove routine called. 377c8f7a62cSLen Brown */ 378c8f7a62cSLen Brown static void dock_remove_acpi_device(acpi_handle handle) 379c8f7a62cSLen Brown { 380c8f7a62cSLen Brown struct acpi_device *device; 381c8f7a62cSLen Brown 382bfee26dbSRafael J. Wysocki if (!acpi_bus_get_device(handle, &device)) 383bfee26dbSRafael J. Wysocki acpi_bus_trim(device); 384c8f7a62cSLen Brown } 385c8f7a62cSLen Brown 386c8f7a62cSLen Brown /** 387c8f7a62cSLen Brown * hotplug_dock_devices - insert or remove devices on the dock station 388c8f7a62cSLen Brown * @ds: the dock station 389c8f7a62cSLen Brown * @event: either bus check or eject request 390c8f7a62cSLen Brown * 391c8f7a62cSLen Brown * Some devices on the dock station need to have drivers called 392c8f7a62cSLen Brown * to perform hotplug operations after a dock event has occurred. 393c8f7a62cSLen Brown * Traverse the list of dock devices that have registered a 394c8f7a62cSLen Brown * hotplug handler, and call the handler. 395c8f7a62cSLen Brown */ 396c8f7a62cSLen Brown static void hotplug_dock_devices(struct dock_station *ds, u32 event) 397c8f7a62cSLen Brown { 398c8f7a62cSLen Brown struct dock_dependent_device *dd; 399c8f7a62cSLen Brown 4008b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 401c8f7a62cSLen Brown 402c8f7a62cSLen Brown /* 403c8f7a62cSLen Brown * First call driver specific hotplug functions 404c8f7a62cSLen Brown */ 40521a31013SRafael J. Wysocki list_for_each_entry(dd, &ds->dependent_devices, list) 40621a31013SRafael J. Wysocki dock_hotplug_event(dd, event, false); 407c8f7a62cSLen Brown 408c8f7a62cSLen Brown /* 409c8f7a62cSLen Brown * Now make sure that an acpi_device is created for each 410c8f7a62cSLen Brown * dependent device, or removed if this is an eject request. 411c8f7a62cSLen Brown * This will cause acpi_drivers to be stopped/started if they 412c8f7a62cSLen Brown * exist 413c8f7a62cSLen Brown */ 414c8f7a62cSLen Brown list_for_each_entry(dd, &ds->dependent_devices, list) { 415c8f7a62cSLen Brown if (event == ACPI_NOTIFY_EJECT_REQUEST) 416c8f7a62cSLen Brown dock_remove_acpi_device(dd->handle); 417c8f7a62cSLen Brown else 418c8f7a62cSLen Brown dock_create_acpi_device(dd->handle); 419c8f7a62cSLen Brown } 4208b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 421c8f7a62cSLen Brown } 422c8f7a62cSLen Brown 423c8f7a62cSLen Brown static void dock_event(struct dock_station *ds, u32 event, int num) 424c8f7a62cSLen Brown { 425db350b08SShaohua Li struct device *dev = &ds->dock_device->dev; 42666b56821SHolger Macht char event_string[13]; 42779a8f70bSKristen Carlson Accardi char *envp[] = { event_string, NULL }; 4281253f7aaSShaohua Li struct dock_dependent_device *dd; 42979a8f70bSKristen Carlson Accardi 43079a8f70bSKristen Carlson Accardi if (num == UNDOCK_EVENT) 43166b56821SHolger Macht sprintf(event_string, "EVENT=undock"); 43279a8f70bSKristen Carlson Accardi else 43366b56821SHolger Macht sprintf(event_string, "EVENT=dock"); 43479a8f70bSKristen Carlson Accardi 4355669021eSKristen Carlson Accardi /* 4368ea86e0bSKristen Carlson Accardi * Indicate that the status of the dock station has 4378ea86e0bSKristen Carlson Accardi * changed. 4385669021eSKristen Carlson Accardi */ 4391253f7aaSShaohua Li if (num == DOCK_EVENT) 4401253f7aaSShaohua Li kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 4411253f7aaSShaohua Li 44221a31013SRafael J. Wysocki list_for_each_entry(dd, &ds->dependent_devices, list) 44321a31013SRafael J. Wysocki dock_hotplug_event(dd, event, true); 444747479a3SAlex Chiang 4451253f7aaSShaohua Li if (num != DOCK_EVENT) 44679a8f70bSKristen Carlson Accardi kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 447c8f7a62cSLen Brown } 448c8f7a62cSLen Brown 449c8f7a62cSLen Brown /** 450c8f7a62cSLen Brown * eject_dock - respond to a dock eject request 451c8f7a62cSLen Brown * @ds: the dock station 452c8f7a62cSLen Brown * 453c8f7a62cSLen Brown * This is called after _DCK is called, to execute the dock station's 454c8f7a62cSLen Brown * _EJ0 method. 455c8f7a62cSLen Brown */ 456c8f7a62cSLen Brown static void eject_dock(struct dock_station *ds) 457c8f7a62cSLen Brown { 458c8f7a62cSLen Brown struct acpi_object_list arg_list; 459c8f7a62cSLen Brown union acpi_object arg; 460c8f7a62cSLen Brown acpi_status status; 461c8f7a62cSLen Brown acpi_handle tmp; 462c8f7a62cSLen Brown 463c8f7a62cSLen Brown /* all dock devices should have _EJ0, but check anyway */ 464c8f7a62cSLen Brown status = acpi_get_handle(ds->handle, "_EJ0", &tmp); 465c8f7a62cSLen Brown if (ACPI_FAILURE(status)) { 466c8f7a62cSLen Brown pr_debug("No _EJ0 support for dock device\n"); 467c8f7a62cSLen Brown return; 468c8f7a62cSLen Brown } 469c8f7a62cSLen Brown 470c8f7a62cSLen Brown arg_list.count = 1; 471c8f7a62cSLen Brown arg_list.pointer = &arg; 472c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 473c8f7a62cSLen Brown arg.integer.value = 1; 474c8f7a62cSLen Brown 475747479a3SAlex Chiang status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); 476747479a3SAlex Chiang if (ACPI_FAILURE(status)) 477c8f7a62cSLen Brown pr_debug("Failed to evaluate _EJ0!\n"); 478c8f7a62cSLen Brown } 479c8f7a62cSLen Brown 480c8f7a62cSLen Brown /** 481c8f7a62cSLen Brown * handle_dock - handle a dock event 482c8f7a62cSLen Brown * @ds: the dock station 483c8f7a62cSLen Brown * @dock: to dock, or undock - that is the question 484c8f7a62cSLen Brown * 485c8f7a62cSLen Brown * Execute the _DCK method in response to an acpi event 486c8f7a62cSLen Brown */ 487c8f7a62cSLen Brown static void handle_dock(struct dock_station *ds, int dock) 488c8f7a62cSLen Brown { 489c8f7a62cSLen Brown acpi_status status; 490c8f7a62cSLen Brown struct acpi_object_list arg_list; 491c8f7a62cSLen Brown union acpi_object arg; 492c8f7a62cSLen Brown struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 493c8f7a62cSLen Brown 494cd73018fSToshi Kani acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking"); 495c8f7a62cSLen Brown 496c8f7a62cSLen Brown /* _DCK method has one argument */ 497c8f7a62cSLen Brown arg_list.count = 1; 498c8f7a62cSLen Brown arg_list.pointer = &arg; 499c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 500c8f7a62cSLen Brown arg.integer.value = dock; 501c8f7a62cSLen Brown status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); 502db350b08SShaohua Li if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) 503cd73018fSToshi Kani acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n", 504cd73018fSToshi Kani status); 5050a918a94SThomas Renninger 506c8f7a62cSLen Brown kfree(buffer.pointer); 507c8f7a62cSLen Brown } 508c8f7a62cSLen Brown 509c8f7a62cSLen Brown static inline void dock(struct dock_station *ds) 510c8f7a62cSLen Brown { 511c8f7a62cSLen Brown handle_dock(ds, 1); 512c8f7a62cSLen Brown } 513c8f7a62cSLen Brown 514c8f7a62cSLen Brown static inline void undock(struct dock_station *ds) 515c8f7a62cSLen Brown { 516c8f7a62cSLen Brown handle_dock(ds, 0); 517c8f7a62cSLen Brown } 518c8f7a62cSLen Brown 519c8f7a62cSLen Brown static inline void begin_dock(struct dock_station *ds) 520c8f7a62cSLen Brown { 521c8f7a62cSLen Brown ds->flags |= DOCK_DOCKING; 522c8f7a62cSLen Brown } 523c8f7a62cSLen Brown 524c8f7a62cSLen Brown static inline void complete_dock(struct dock_station *ds) 525c8f7a62cSLen Brown { 526c8f7a62cSLen Brown ds->flags &= ~(DOCK_DOCKING); 527c8f7a62cSLen Brown ds->last_dock_time = jiffies; 528c8f7a62cSLen Brown } 529c8f7a62cSLen Brown 530a0cd35fdSKristen Carlson Accardi static inline void begin_undock(struct dock_station *ds) 531a0cd35fdSKristen Carlson Accardi { 532a0cd35fdSKristen Carlson Accardi ds->flags |= DOCK_UNDOCKING; 533a0cd35fdSKristen Carlson Accardi } 534a0cd35fdSKristen Carlson Accardi 535a0cd35fdSKristen Carlson Accardi static inline void complete_undock(struct dock_station *ds) 536a0cd35fdSKristen Carlson Accardi { 537a0cd35fdSKristen Carlson Accardi ds->flags &= ~(DOCK_UNDOCKING); 538a0cd35fdSKristen Carlson Accardi } 539a0cd35fdSKristen Carlson Accardi 540406f692dSShaohua Li static void dock_lock(struct dock_station *ds, int lock) 541406f692dSShaohua Li { 542406f692dSShaohua Li struct acpi_object_list arg_list; 543406f692dSShaohua Li union acpi_object arg; 544406f692dSShaohua Li acpi_status status; 545406f692dSShaohua Li 546406f692dSShaohua Li arg_list.count = 1; 547406f692dSShaohua Li arg_list.pointer = &arg; 548406f692dSShaohua Li arg.type = ACPI_TYPE_INTEGER; 549406f692dSShaohua Li arg.integer.value = !!lock; 550406f692dSShaohua Li status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); 551406f692dSShaohua Li if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 552406f692dSShaohua Li if (lock) 553cd73018fSToshi Kani acpi_handle_warn(ds->handle, 554cd73018fSToshi Kani "Locking device failed (0x%x)\n", status); 555406f692dSShaohua Li else 556cd73018fSToshi Kani acpi_handle_warn(ds->handle, 557cd73018fSToshi Kani "Unlocking device failed (0x%x)\n", status); 558406f692dSShaohua Li } 559406f692dSShaohua Li } 560406f692dSShaohua Li 561c8f7a62cSLen Brown /** 562c8f7a62cSLen Brown * dock_in_progress - see if we are in the middle of handling a dock event 563c8f7a62cSLen Brown * @ds: the dock station 564c8f7a62cSLen Brown * 565c8f7a62cSLen Brown * Sometimes while docking, false dock events can be sent to the driver 566c8f7a62cSLen Brown * because good connections aren't made or some other reason. Ignore these 567c8f7a62cSLen Brown * if we are in the middle of doing something. 568c8f7a62cSLen Brown */ 569c8f7a62cSLen Brown static int dock_in_progress(struct dock_station *ds) 570c8f7a62cSLen Brown { 571c8f7a62cSLen Brown if ((ds->flags & DOCK_DOCKING) || 572c8f7a62cSLen Brown time_before(jiffies, (ds->last_dock_time + HZ))) 573c8f7a62cSLen Brown return 1; 574c8f7a62cSLen Brown return 0; 575c8f7a62cSLen Brown } 576c8f7a62cSLen Brown 577c8f7a62cSLen Brown /** 578c8f7a62cSLen Brown * register_dock_notifier - add yourself to the dock notifier list 579c8f7a62cSLen Brown * @nb: the callers notifier block 580c8f7a62cSLen Brown * 581c8f7a62cSLen Brown * If a driver wishes to be notified about dock events, they can 582c8f7a62cSLen Brown * use this function to put a notifier block on the dock notifier list. 583c8f7a62cSLen Brown * this notifier call chain will be called after a dock event, but 584c8f7a62cSLen Brown * before hotplugging any new devices. 585c8f7a62cSLen Brown */ 586c8f7a62cSLen Brown int register_dock_notifier(struct notifier_block *nb) 587c8f7a62cSLen Brown { 588db350b08SShaohua Li if (!dock_station_count) 5892548c06bSPrarit Bhargava return -ENODEV; 5902548c06bSPrarit Bhargava 591c8f7a62cSLen Brown return atomic_notifier_chain_register(&dock_notifier_list, nb); 592c8f7a62cSLen Brown } 593c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_dock_notifier); 594c8f7a62cSLen Brown 595c8f7a62cSLen Brown /** 596c8f7a62cSLen Brown * unregister_dock_notifier - remove yourself from the dock notifier list 597c8f7a62cSLen Brown * @nb: the callers notifier block 598c8f7a62cSLen Brown */ 599c8f7a62cSLen Brown void unregister_dock_notifier(struct notifier_block *nb) 600c8f7a62cSLen Brown { 601db350b08SShaohua Li if (!dock_station_count) 6022548c06bSPrarit Bhargava return; 6032548c06bSPrarit Bhargava 604c8f7a62cSLen Brown atomic_notifier_chain_unregister(&dock_notifier_list, nb); 605c8f7a62cSLen Brown } 606c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_dock_notifier); 607c8f7a62cSLen Brown 608c8f7a62cSLen Brown /** 609c8f7a62cSLen Brown * register_hotplug_dock_device - register a hotplug function 610c8f7a62cSLen Brown * @handle: the handle of the device 6111253f7aaSShaohua Li * @ops: handlers to call after docking 612c8f7a62cSLen Brown * @context: device specific data 61321a31013SRafael J. Wysocki * @init: Optional initialization routine to run after registration 61421a31013SRafael J. Wysocki * @release: Optional release routine to run on unregistration 615c8f7a62cSLen Brown * 616c8f7a62cSLen Brown * If a driver would like to perform a hotplug operation after a dock 617c8f7a62cSLen Brown * event, they can register an acpi_notifiy_handler to be called by 618c8f7a62cSLen Brown * the dock driver after _DCK is executed. 619c8f7a62cSLen Brown */ 62021a31013SRafael J. Wysocki int register_hotplug_dock_device(acpi_handle handle, 62121a31013SRafael J. Wysocki const struct acpi_dock_ops *ops, void *context, 62221a31013SRafael J. Wysocki void (*init)(void *), void (*release)(void *)) 623c8f7a62cSLen Brown { 624c8f7a62cSLen Brown struct dock_dependent_device *dd; 625db350b08SShaohua Li struct dock_station *dock_station; 62661b83695SShaohua Li int ret = -EINVAL; 627c8f7a62cSLen Brown 62821a31013SRafael J. Wysocki if (WARN_ON(!context)) 62921a31013SRafael J. Wysocki return -EINVAL; 63021a31013SRafael J. Wysocki 631db350b08SShaohua Li if (!dock_station_count) 632c8f7a62cSLen Brown return -ENODEV; 633c8f7a62cSLen Brown 634c8f7a62cSLen Brown /* 635c8f7a62cSLen Brown * make sure this handle is for a device dependent on the dock, 636c8f7a62cSLen Brown * this would include the dock station itself 637c8f7a62cSLen Brown */ 63850d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 63961b83695SShaohua Li /* 64061b83695SShaohua Li * An ATA bay can be in a dock and itself can be ejected 6413ad2f3fbSDaniel Mack * separately, so there are two 'dock stations' which need the 64261b83695SShaohua Li * ops 64361b83695SShaohua Li */ 644c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 64521a31013SRafael J. Wysocki if (dd && !dock_init_hotplug(dd, ops, context, init, release)) 64661b83695SShaohua Li ret = 0; 647c8f7a62cSLen Brown } 648c8f7a62cSLen Brown 64961b83695SShaohua Li return ret; 650c8f7a62cSLen Brown } 651c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_hotplug_dock_device); 652c8f7a62cSLen Brown 653c8f7a62cSLen Brown /** 654c8f7a62cSLen Brown * unregister_hotplug_dock_device - remove yourself from the hotplug list 655c8f7a62cSLen Brown * @handle: the acpi handle of the device 656c8f7a62cSLen Brown */ 657c8f7a62cSLen Brown void unregister_hotplug_dock_device(acpi_handle handle) 658c8f7a62cSLen Brown { 659c8f7a62cSLen Brown struct dock_dependent_device *dd; 660db350b08SShaohua Li struct dock_station *dock_station; 661c8f7a62cSLen Brown 662db350b08SShaohua Li if (!dock_station_count) 663c8f7a62cSLen Brown return; 664c8f7a62cSLen Brown 66550d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 666c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 667c8f7a62cSLen Brown if (dd) 66821a31013SRafael J. Wysocki dock_release_hotplug(dd); 669c8f7a62cSLen Brown } 670db350b08SShaohua Li } 671c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); 672c8f7a62cSLen Brown 673c8f7a62cSLen Brown /** 674c80fdbe8Sbrandon@ifup.org * handle_eject_request - handle an undock request checking for error conditions 675c80fdbe8Sbrandon@ifup.org * 676c80fdbe8Sbrandon@ifup.org * Check to make sure the dock device is still present, then undock and 677c80fdbe8Sbrandon@ifup.org * hotremove all the devices that may need removing. 678c80fdbe8Sbrandon@ifup.org */ 679c80fdbe8Sbrandon@ifup.org static int handle_eject_request(struct dock_station *ds, u32 event) 680c80fdbe8Sbrandon@ifup.org { 681c80fdbe8Sbrandon@ifup.org if (dock_in_progress(ds)) 682c80fdbe8Sbrandon@ifup.org return -EBUSY; 683c80fdbe8Sbrandon@ifup.org 684c80fdbe8Sbrandon@ifup.org /* 685c80fdbe8Sbrandon@ifup.org * here we need to generate the undock 686c80fdbe8Sbrandon@ifup.org * event prior to actually doing the undock 687c80fdbe8Sbrandon@ifup.org * so that the device struct still exists. 688afd7301dSHolger Macht * Also, even send the dock event if the 689afd7301dSHolger Macht * device is not present anymore 690c80fdbe8Sbrandon@ifup.org */ 691c80fdbe8Sbrandon@ifup.org dock_event(ds, event, UNDOCK_EVENT); 692afd7301dSHolger Macht 693c80fdbe8Sbrandon@ifup.org hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); 694c80fdbe8Sbrandon@ifup.org undock(ds); 695406f692dSShaohua Li dock_lock(ds, 0); 696c80fdbe8Sbrandon@ifup.org eject_dock(ds); 697c80fdbe8Sbrandon@ifup.org if (dock_present(ds)) { 698cd73018fSToshi Kani acpi_handle_err(ds->handle, "Unable to undock!\n"); 699c80fdbe8Sbrandon@ifup.org return -EBUSY; 700c80fdbe8Sbrandon@ifup.org } 701a0cd35fdSKristen Carlson Accardi complete_undock(ds); 702c80fdbe8Sbrandon@ifup.org return 0; 703c80fdbe8Sbrandon@ifup.org } 704c80fdbe8Sbrandon@ifup.org 705c80fdbe8Sbrandon@ifup.org /** 706c8f7a62cSLen Brown * dock_notify - act upon an acpi dock notification 707c8f7a62cSLen Brown * @handle: the dock station handle 708c8f7a62cSLen Brown * @event: the acpi event 709c8f7a62cSLen Brown * @data: our driver data struct 710c8f7a62cSLen Brown * 711c8f7a62cSLen Brown * If we are notified to dock, then check to see if the dock is 712c8f7a62cSLen Brown * present and then dock. Notify all drivers of the dock event, 713c80fdbe8Sbrandon@ifup.org * and then hotplug and devices that may need hotplugging. 714c8f7a62cSLen Brown */ 715c8f7a62cSLen Brown static void dock_notify(acpi_handle handle, u32 event, void *data) 716c8f7a62cSLen Brown { 71750dd0969SJan Engelhardt struct dock_station *ds = data; 7188b59560aSShaohua Li struct acpi_device *tmp; 719db350b08SShaohua Li int surprise_removal = 0; 720c8f7a62cSLen Brown 721db350b08SShaohua Li /* 722db350b08SShaohua Li * According to acpi spec 3.0a, if a DEVICE_CHECK notification 723db350b08SShaohua Li * is sent and _DCK is present, it is assumed to mean an undock 724db350b08SShaohua Li * request. 725db350b08SShaohua Li */ 726db350b08SShaohua Li if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) 727db350b08SShaohua Li event = ACPI_NOTIFY_EJECT_REQUEST; 728db350b08SShaohua Li 729db350b08SShaohua Li /* 730db350b08SShaohua Li * dock station: BUS_CHECK - docked or surprise removal 731db350b08SShaohua Li * DEVICE_CHECK - undocked 732db350b08SShaohua Li * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal 733db350b08SShaohua Li * 734db350b08SShaohua Li * To simplify event handling, dock dependent device handler always 735db350b08SShaohua Li * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and 736db350b08SShaohua Li * ACPI_NOTIFY_EJECT_REQUEST for removal 737db350b08SShaohua Li */ 738c8f7a62cSLen Brown switch (event) { 739c8f7a62cSLen Brown case ACPI_NOTIFY_BUS_CHECK: 740db350b08SShaohua Li case ACPI_NOTIFY_DEVICE_CHECK: 7418b59560aSShaohua Li if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, 7428b59560aSShaohua Li &tmp)) { 743c8f7a62cSLen Brown begin_dock(ds); 744c8f7a62cSLen Brown dock(ds); 745c8f7a62cSLen Brown if (!dock_present(ds)) { 746cd73018fSToshi Kani acpi_handle_err(handle, "Unable to dock!\n"); 7478b59560aSShaohua Li complete_dock(ds); 748c8f7a62cSLen Brown break; 749c8f7a62cSLen Brown } 750c8f7a62cSLen Brown atomic_notifier_call_chain(&dock_notifier_list, 751c8f7a62cSLen Brown event, NULL); 752c8f7a62cSLen Brown hotplug_dock_devices(ds, event); 753c8f7a62cSLen Brown complete_dock(ds); 754c8f7a62cSLen Brown dock_event(ds, event, DOCK_EVENT); 755406f692dSShaohua Li dock_lock(ds, 1); 7563a37898dSLin Ming acpi_update_all_gpes(); 757c8f7a62cSLen Brown break; 758db350b08SShaohua Li } 759db350b08SShaohua Li if (dock_present(ds) || dock_in_progress(ds)) 760db350b08SShaohua Li break; 761db350b08SShaohua Li /* This is a surprise removal */ 762db350b08SShaohua Li surprise_removal = 1; 763db350b08SShaohua Li event = ACPI_NOTIFY_EJECT_REQUEST; 764db350b08SShaohua Li /* Fall back */ 765c8f7a62cSLen Brown case ACPI_NOTIFY_EJECT_REQUEST: 766a0cd35fdSKristen Carlson Accardi begin_undock(ds); 767f730ae18SShaohua Li if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) 768f730ae18SShaohua Li || surprise_removal) 769c80fdbe8Sbrandon@ifup.org handle_eject_request(ds, event); 770a0cd35fdSKristen Carlson Accardi else 771a0cd35fdSKristen Carlson Accardi dock_event(ds, event, UNDOCK_EVENT); 772c8f7a62cSLen Brown break; 773c8f7a62cSLen Brown default: 774cd73018fSToshi Kani acpi_handle_err(handle, "Unknown dock event %d\n", event); 775c8f7a62cSLen Brown } 776c8f7a62cSLen Brown } 777c8f7a62cSLen Brown 77819cd847aSZhang Rui struct dock_data { 77919cd847aSZhang Rui acpi_handle handle; 78019cd847aSZhang Rui unsigned long event; 78119cd847aSZhang Rui struct dock_station *ds; 78219cd847aSZhang Rui }; 78319cd847aSZhang Rui 78419cd847aSZhang Rui static void acpi_dock_deferred_cb(void *context) 78519cd847aSZhang Rui { 786747479a3SAlex Chiang struct dock_data *data = context; 78719cd847aSZhang Rui 7883757b948SRafael J. Wysocki acpi_scan_lock_acquire(); 78919cd847aSZhang Rui dock_notify(data->handle, data->event, data->ds); 7903757b948SRafael J. Wysocki acpi_scan_lock_release(); 79119cd847aSZhang Rui kfree(data); 79219cd847aSZhang Rui } 79319cd847aSZhang Rui 7946bd00a61SShaohua Li static int acpi_dock_notifier_call(struct notifier_block *this, 7956bd00a61SShaohua Li unsigned long event, void *data) 7966bd00a61SShaohua Li { 7976bd00a61SShaohua Li struct dock_station *dock_station; 798747479a3SAlex Chiang acpi_handle handle = data; 7996bd00a61SShaohua Li 8006bd00a61SShaohua Li if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK 8016bd00a61SShaohua Li && event != ACPI_NOTIFY_EJECT_REQUEST) 8026bd00a61SShaohua Li return 0; 8033757b948SRafael J. Wysocki 8043757b948SRafael J. Wysocki acpi_scan_lock_acquire(); 8053757b948SRafael J. Wysocki 80650d716e4SAlex Chiang list_for_each_entry(dock_station, &dock_stations, sibling) { 8076bd00a61SShaohua Li if (dock_station->handle == handle) { 808747479a3SAlex Chiang struct dock_data *dd; 8093757b948SRafael J. Wysocki acpi_status status; 81019cd847aSZhang Rui 811747479a3SAlex Chiang dd = kmalloc(sizeof(*dd), GFP_KERNEL); 812747479a3SAlex Chiang if (!dd) 8133757b948SRafael J. Wysocki break; 8143757b948SRafael J. Wysocki 815747479a3SAlex Chiang dd->handle = handle; 816747479a3SAlex Chiang dd->event = event; 817747479a3SAlex Chiang dd->ds = dock_station; 8183757b948SRafael J. Wysocki status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, 8193757b948SRafael J. Wysocki dd); 8203757b948SRafael J. Wysocki if (ACPI_FAILURE(status)) 8213757b948SRafael J. Wysocki kfree(dd); 8223757b948SRafael J. Wysocki 8233757b948SRafael J. Wysocki break; 8246bd00a61SShaohua Li } 8256bd00a61SShaohua Li } 8263757b948SRafael J. Wysocki 8273757b948SRafael J. Wysocki acpi_scan_lock_release(); 8286bd00a61SShaohua Li return 0; 8296bd00a61SShaohua Li } 8306bd00a61SShaohua Li 8316bd00a61SShaohua Li static struct notifier_block dock_acpi_notifier = { 8326bd00a61SShaohua Li .notifier_call = acpi_dock_notifier_call, 8336bd00a61SShaohua Li }; 8346bd00a61SShaohua Li 835c8f7a62cSLen Brown /** 836c8f7a62cSLen Brown * find_dock_devices - find devices on the dock station 837c8f7a62cSLen Brown * @handle: the handle of the device we are examining 838c8f7a62cSLen Brown * @lvl: unused 839c8f7a62cSLen Brown * @context: the dock station private data 840c8f7a62cSLen Brown * @rv: unused 841c8f7a62cSLen Brown * 842c8f7a62cSLen Brown * This function is called by acpi_walk_namespace. It will 843c8f7a62cSLen Brown * check to see if an object has an _EJD method. If it does, then it 844c8f7a62cSLen Brown * will see if it is dependent on the dock station. 845c8f7a62cSLen Brown */ 846d423c083SJiang Liu static acpi_status __init 847c8f7a62cSLen Brown find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) 848c8f7a62cSLen Brown { 849c8f7a62cSLen Brown acpi_status status; 850fe9a2f77SKristen Carlson Accardi acpi_handle tmp, parent; 85150dd0969SJan Engelhardt struct dock_station *ds = context; 852c8f7a62cSLen Brown 853c8f7a62cSLen Brown status = acpi_bus_get_ejd(handle, &tmp); 854fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) { 855fe9a2f77SKristen Carlson Accardi /* try the parent device as well */ 856fe9a2f77SKristen Carlson Accardi status = acpi_get_parent(handle, &parent); 857c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 858fe9a2f77SKristen Carlson Accardi goto fdd_out; 859fe9a2f77SKristen Carlson Accardi /* see if parent is dependent on dock */ 860fe9a2f77SKristen Carlson Accardi status = acpi_bus_get_ejd(parent, &tmp); 861fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) 862fe9a2f77SKristen Carlson Accardi goto fdd_out; 863fe9a2f77SKristen Carlson Accardi } 864c8f7a62cSLen Brown 865f69cfdd2SAlex Chiang if (tmp == ds->handle) 866f69cfdd2SAlex Chiang add_dock_dependent_device(ds, handle); 867f69cfdd2SAlex Chiang 868fe9a2f77SKristen Carlson Accardi fdd_out: 869c8f7a62cSLen Brown return AE_OK; 870c8f7a62cSLen Brown } 871c8f7a62cSLen Brown 872c80fdbe8Sbrandon@ifup.org /* 873c80fdbe8Sbrandon@ifup.org * show_docked - read method for "docked" file in sysfs 874c80fdbe8Sbrandon@ifup.org */ 875c80fdbe8Sbrandon@ifup.org static ssize_t show_docked(struct device *dev, 876c80fdbe8Sbrandon@ifup.org struct device_attribute *attr, char *buf) 877c80fdbe8Sbrandon@ifup.org { 878fc5a9f88SHolger Macht struct acpi_device *tmp; 879fc5a9f88SHolger Macht 880fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 881c80fdbe8Sbrandon@ifup.org 88202df7349SYasuaki Ishimatsu if (!acpi_bus_get_device(dock_station->handle, &tmp)) 883fc5a9f88SHolger Macht return snprintf(buf, PAGE_SIZE, "1\n"); 884fc5a9f88SHolger Macht return snprintf(buf, PAGE_SIZE, "0\n"); 885c80fdbe8Sbrandon@ifup.org } 886e5685b9dSAdrian Bunk static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); 887c80fdbe8Sbrandon@ifup.org 888c80fdbe8Sbrandon@ifup.org /* 889a0cd35fdSKristen Carlson Accardi * show_flags - read method for flags file in sysfs 890a0cd35fdSKristen Carlson Accardi */ 891a0cd35fdSKristen Carlson Accardi static ssize_t show_flags(struct device *dev, 892a0cd35fdSKristen Carlson Accardi struct device_attribute *attr, char *buf) 893a0cd35fdSKristen Carlson Accardi { 894fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 895a0cd35fdSKristen Carlson Accardi return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); 896a0cd35fdSKristen Carlson Accardi 897a0cd35fdSKristen Carlson Accardi } 898e5685b9dSAdrian Bunk static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); 899a0cd35fdSKristen Carlson Accardi 900a0cd35fdSKristen Carlson Accardi /* 901c80fdbe8Sbrandon@ifup.org * write_undock - write method for "undock" file in sysfs 902c80fdbe8Sbrandon@ifup.org */ 903c80fdbe8Sbrandon@ifup.org static ssize_t write_undock(struct device *dev, struct device_attribute *attr, 904c80fdbe8Sbrandon@ifup.org const char *buf, size_t count) 905c80fdbe8Sbrandon@ifup.org { 906c80fdbe8Sbrandon@ifup.org int ret; 907fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 908c80fdbe8Sbrandon@ifup.org 909c80fdbe8Sbrandon@ifup.org if (!count) 910c80fdbe8Sbrandon@ifup.org return -EINVAL; 911c80fdbe8Sbrandon@ifup.org 9128112006fSRafael J. Wysocki acpi_scan_lock_acquire(); 9139171f834SHolger Macht begin_undock(dock_station); 914c80fdbe8Sbrandon@ifup.org ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); 9158112006fSRafael J. Wysocki acpi_scan_lock_release(); 916c80fdbe8Sbrandon@ifup.org return ret ? ret: count; 917c80fdbe8Sbrandon@ifup.org } 918e5685b9dSAdrian Bunk static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); 919c80fdbe8Sbrandon@ifup.org 920ac122bb6SIlya A. Volynets-Evenbakh /* 921ac122bb6SIlya A. Volynets-Evenbakh * show_dock_uid - read method for "uid" file in sysfs 922ac122bb6SIlya A. Volynets-Evenbakh */ 923ac122bb6SIlya A. Volynets-Evenbakh static ssize_t show_dock_uid(struct device *dev, 924ac122bb6SIlya A. Volynets-Evenbakh struct device_attribute *attr, char *buf) 925ac122bb6SIlya A. Volynets-Evenbakh { 92627663c58SMatthew Wilcox unsigned long long lbuf; 927fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 92838ff4ffcSKristen Carlson Accardi acpi_status status = acpi_evaluate_integer(dock_station->handle, 92938ff4ffcSKristen Carlson Accardi "_UID", NULL, &lbuf); 93038ff4ffcSKristen Carlson Accardi if (ACPI_FAILURE(status)) 931ac122bb6SIlya A. Volynets-Evenbakh return 0; 93238ff4ffcSKristen Carlson Accardi 93327663c58SMatthew Wilcox return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); 934ac122bb6SIlya A. Volynets-Evenbakh } 935e5685b9dSAdrian Bunk static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); 936ac122bb6SIlya A. Volynets-Evenbakh 9378652b00fSShaohua Li static ssize_t show_dock_type(struct device *dev, 9388652b00fSShaohua Li struct device_attribute *attr, char *buf) 9398652b00fSShaohua Li { 940fe06fba2SAlex Chiang struct dock_station *dock_station = dev->platform_data; 9418652b00fSShaohua Li char *type; 9428652b00fSShaohua Li 9438652b00fSShaohua Li if (dock_station->flags & DOCK_IS_DOCK) 9448652b00fSShaohua Li type = "dock_station"; 9458652b00fSShaohua Li else if (dock_station->flags & DOCK_IS_ATA) 9468652b00fSShaohua Li type = "ata_bay"; 9478652b00fSShaohua Li else if (dock_station->flags & DOCK_IS_BAT) 9488652b00fSShaohua Li type = "battery_bay"; 9498652b00fSShaohua Li else 9508652b00fSShaohua Li type = "unknown"; 9518652b00fSShaohua Li 9528652b00fSShaohua Li return snprintf(buf, PAGE_SIZE, "%s\n", type); 9538652b00fSShaohua Li } 9548652b00fSShaohua Li static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); 9558652b00fSShaohua Li 9565f46c2f2SAlex Chiang static struct attribute *dock_attributes[] = { 9575f46c2f2SAlex Chiang &dev_attr_docked.attr, 9585f46c2f2SAlex Chiang &dev_attr_flags.attr, 9595f46c2f2SAlex Chiang &dev_attr_undock.attr, 9605f46c2f2SAlex Chiang &dev_attr_uid.attr, 9615f46c2f2SAlex Chiang &dev_attr_type.attr, 9625f46c2f2SAlex Chiang NULL 9635f46c2f2SAlex Chiang }; 9645f46c2f2SAlex Chiang 9655f46c2f2SAlex Chiang static struct attribute_group dock_attribute_group = { 9665f46c2f2SAlex Chiang .attrs = dock_attributes 9675f46c2f2SAlex Chiang }; 9685f46c2f2SAlex Chiang 969c8f7a62cSLen Brown /** 970c8f7a62cSLen Brown * dock_add - add a new dock station 971c8f7a62cSLen Brown * @handle: the dock station handle 972c8f7a62cSLen Brown * 973c8f7a62cSLen Brown * allocated and initialize a new dock station device. Find all devices 974c8f7a62cSLen Brown * that are on the dock station, and register for dock event notifications. 975c8f7a62cSLen Brown */ 976d38a5edfSUwe Kleine-König static int __init dock_add(acpi_handle handle) 977c8f7a62cSLen Brown { 978fe06fba2SAlex Chiang int ret, id; 979fe06fba2SAlex Chiang struct dock_station ds, *dock_station; 980747479a3SAlex Chiang struct platform_device *dd; 981c8f7a62cSLen Brown 982fe06fba2SAlex Chiang id = dock_station_count; 98349c6fb2eSAlex Chiang memset(&ds, 0, sizeof(ds)); 984747479a3SAlex Chiang dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); 985747479a3SAlex Chiang if (IS_ERR(dd)) 986747479a3SAlex Chiang return PTR_ERR(dd); 9879751cb72SAlex Chiang 988747479a3SAlex Chiang dock_station = dd->dev.platform_data; 989747479a3SAlex Chiang 990c8f7a62cSLen Brown dock_station->handle = handle; 991747479a3SAlex Chiang dock_station->dock_device = dd; 992c8f7a62cSLen Brown dock_station->last_dock_time = jiffies - HZ; 993c8f7a62cSLen Brown 994c8f7a62cSLen Brown mutex_init(&dock_station->hp_lock); 995747479a3SAlex Chiang INIT_LIST_HEAD(&dock_station->sibling); 996747479a3SAlex Chiang INIT_LIST_HEAD(&dock_station->dependent_devices); 997a0cd35fdSKristen Carlson Accardi 9989ef2a9a9SKristen Carlson Accardi /* we want the dock device to send uevents */ 999747479a3SAlex Chiang dev_set_uevent_suppress(&dd->dev, 0); 10009ef2a9a9SKristen Carlson Accardi 1001db350b08SShaohua Li if (is_dock(handle)) 1002db350b08SShaohua Li dock_station->flags |= DOCK_IS_DOCK; 1003db350b08SShaohua Li if (is_ata(handle)) 1004db350b08SShaohua Li dock_station->flags |= DOCK_IS_ATA; 1005db350b08SShaohua Li if (is_battery(handle)) 1006db350b08SShaohua Li dock_station->flags |= DOCK_IS_BAT; 1007db350b08SShaohua Li 1008747479a3SAlex Chiang ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); 10098652b00fSShaohua Li if (ret) 10105f46c2f2SAlex Chiang goto err_unregister; 1011671adbecSKristen Carlson Accardi 1012c8f7a62cSLen Brown /* Find dependent devices */ 1013c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 10142263576cSLin Ming ACPI_UINT32_MAX, find_dock_devices, NULL, 10152263576cSLin Ming dock_station, NULL); 1016c8f7a62cSLen Brown 1017c8f7a62cSLen Brown /* add the dock station as a device dependent on itself */ 1018f69cfdd2SAlex Chiang ret = add_dock_dependent_device(dock_station, handle); 1019f69cfdd2SAlex Chiang if (ret) 10205f46c2f2SAlex Chiang goto err_rmgroup; 1021c8f7a62cSLen Brown 1022db350b08SShaohua Li dock_station_count++; 102350d716e4SAlex Chiang list_add(&dock_station->sibling, &dock_stations); 1024c8f7a62cSLen Brown return 0; 1025c8f7a62cSLen Brown 10265f46c2f2SAlex Chiang err_rmgroup: 1027747479a3SAlex Chiang sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); 10285f46c2f2SAlex Chiang err_unregister: 1029747479a3SAlex Chiang platform_device_unregister(dd); 1030cd73018fSToshi Kani acpi_handle_err(handle, "%s encountered error %d\n", __func__, ret); 1031c8f7a62cSLen Brown return ret; 1032c8f7a62cSLen Brown } 1033c8f7a62cSLen Brown 1034c8f7a62cSLen Brown /** 10358ab0ab25SToshi Kani * find_dock_and_bay - look for dock stations and bays 1036c8f7a62cSLen Brown * @handle: acpi handle of a device 1037c8f7a62cSLen Brown * @lvl: unused 10388ab0ab25SToshi Kani * @context: unused 1039c8f7a62cSLen Brown * @rv: unused 1040c8f7a62cSLen Brown * 10418ab0ab25SToshi Kani * This is called by acpi_walk_namespace to look for dock stations and bays. 1042c8f7a62cSLen Brown */ 1043d38a5edfSUwe Kleine-König static __init acpi_status 10448ab0ab25SToshi Kani find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv) 1045c8f7a62cSLen Brown { 10468ab0ab25SToshi Kani if (is_dock(handle) || is_ejectable_bay(handle)) 10471ee4d61fSZhang Rui dock_add(handle); 1048747479a3SAlex Chiang 10491ee4d61fSZhang Rui return AE_OK; 1050c8f7a62cSLen Brown } 1051c8f7a62cSLen Brown 10522ce65fe8SRafael J. Wysocki void __init acpi_dock_init(void) 1053c8f7a62cSLen Brown { 1054816c2edaSLen Brown if (acpi_disabled) 10552ce65fe8SRafael J. Wysocki return; 1056816c2edaSLen Brown 10578ab0ab25SToshi Kani /* look for dock stations and bays */ 1058c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 10598ab0ab25SToshi Kani ACPI_UINT32_MAX, find_dock_and_bay, NULL, NULL, NULL); 1060c8f7a62cSLen Brown 1061db350b08SShaohua Li if (!dock_station_count) { 1062cd73018fSToshi Kani pr_info(PREFIX "No dock devices found.\n"); 10632ce65fe8SRafael J. Wysocki return; 1064db350b08SShaohua Li } 1065c8f7a62cSLen Brown 1066f22ff552SJiang Liu ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); 10676bd00a61SShaohua Li register_acpi_bus_notifier(&dock_acpi_notifier); 1068cd73018fSToshi Kani pr_info(PREFIX "%s: %d docks/bays found\n", 1069db350b08SShaohua Li ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); 1070c8f7a62cSLen Brown } 1071