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> 27c8f7a62cSLen Brown #include <linux/init.h> 28c8f7a62cSLen Brown #include <linux/types.h> 29c8f7a62cSLen Brown #include <linux/notifier.h> 30671adbecSKristen Carlson Accardi #include <linux/platform_device.h> 31914e2637SAl Viro #include <linux/jiffies.h> 3262a6d7fdSRandy Dunlap #include <linux/stddef.h> 33c8f7a62cSLen Brown #include <acpi/acpi_bus.h> 34c8f7a62cSLen Brown #include <acpi/acpi_drivers.h> 35c8f7a62cSLen Brown 367cda93e0SLen Brown #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" 37c8f7a62cSLen Brown 38f52fd66dSLen Brown ACPI_MODULE_NAME("dock"); 39c8f7a62cSLen Brown MODULE_AUTHOR("Kristen Carlson Accardi"); 407cda93e0SLen Brown MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); 41c8f7a62cSLen Brown MODULE_LICENSE("GPL"); 42c8f7a62cSLen Brown 43a0cd35fdSKristen Carlson Accardi static int immediate_undock = 1; 44a0cd35fdSKristen Carlson Accardi module_param(immediate_undock, bool, 0644); 45a0cd35fdSKristen Carlson Accardi MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " 46a0cd35fdSKristen Carlson Accardi "undock immediately when the undock button is pressed, 0 will cause" 47a0cd35fdSKristen Carlson Accardi " the driver to wait for userspace to write the undock sysfs file " 48a0cd35fdSKristen Carlson Accardi " before undocking"); 49a0cd35fdSKristen Carlson Accardi 50c8f7a62cSLen Brown static struct atomic_notifier_head dock_notifier_list; 510f6f2804SKristen Carlson Accardi static struct platform_device *dock_device; 52671adbecSKristen Carlson Accardi static char dock_device_name[] = "dock"; 53c8f7a62cSLen Brown 54a340af14SFrank Seidel static const struct acpi_device_id dock_device_ids[] = { 55a340af14SFrank Seidel {"LNXDOCK", 0}, 56a340af14SFrank Seidel {"", 0}, 57a340af14SFrank Seidel }; 58a340af14SFrank Seidel MODULE_DEVICE_TABLE(acpi, dock_device_ids); 59a340af14SFrank Seidel 60c8f7a62cSLen Brown struct dock_station { 61c8f7a62cSLen Brown acpi_handle handle; 62c8f7a62cSLen Brown unsigned long last_dock_time; 63c8f7a62cSLen Brown u32 flags; 64c8f7a62cSLen Brown spinlock_t dd_lock; 658b0dc866SKristen Carlson Accardi struct mutex hp_lock; 66c8f7a62cSLen Brown struct list_head dependent_devices; 67c8f7a62cSLen Brown struct list_head hotplug_devices; 68c8f7a62cSLen Brown }; 69c8f7a62cSLen Brown 70c8f7a62cSLen Brown struct dock_dependent_device { 71c8f7a62cSLen Brown struct list_head list; 72c8f7a62cSLen Brown struct list_head hotplug_list; 73c8f7a62cSLen Brown acpi_handle handle; 74c8f7a62cSLen Brown acpi_notify_handler handler; 75c8f7a62cSLen Brown void *context; 76c8f7a62cSLen Brown }; 77c8f7a62cSLen Brown 78c8f7a62cSLen Brown #define DOCK_DOCKING 0x00000001 79a0cd35fdSKristen Carlson Accardi #define DOCK_UNDOCKING 0x00000002 805669021eSKristen Carlson Accardi #define DOCK_EVENT 3 815669021eSKristen Carlson Accardi #define UNDOCK_EVENT 2 82c8f7a62cSLen Brown 83c8f7a62cSLen Brown static struct dock_station *dock_station; 84c8f7a62cSLen Brown 85c8f7a62cSLen Brown /***************************************************************************** 86c8f7a62cSLen Brown * Dock Dependent device functions * 87c8f7a62cSLen Brown *****************************************************************************/ 88c8f7a62cSLen Brown /** 89c8f7a62cSLen Brown * alloc_dock_dependent_device - allocate and init a dependent device 90c8f7a62cSLen Brown * @handle: the acpi_handle of the dependent device 91c8f7a62cSLen Brown * 92c8f7a62cSLen Brown * Allocate memory for a dependent device structure for a device referenced 93c8f7a62cSLen Brown * by the acpi handle 94c8f7a62cSLen Brown */ 95c8f7a62cSLen Brown static struct dock_dependent_device * 96c8f7a62cSLen Brown alloc_dock_dependent_device(acpi_handle handle) 97c8f7a62cSLen Brown { 98c8f7a62cSLen Brown struct dock_dependent_device *dd; 99c8f7a62cSLen Brown 100c8f7a62cSLen Brown dd = kzalloc(sizeof(*dd), GFP_KERNEL); 101c8f7a62cSLen Brown if (dd) { 102c8f7a62cSLen Brown dd->handle = handle; 103c8f7a62cSLen Brown INIT_LIST_HEAD(&dd->list); 104c8f7a62cSLen Brown INIT_LIST_HEAD(&dd->hotplug_list); 105c8f7a62cSLen Brown } 106c8f7a62cSLen Brown return dd; 107c8f7a62cSLen Brown } 108c8f7a62cSLen Brown 109c8f7a62cSLen Brown /** 110c8f7a62cSLen Brown * add_dock_dependent_device - associate a device with the dock station 111c8f7a62cSLen Brown * @ds: The dock station 112c8f7a62cSLen Brown * @dd: The dependent device 113c8f7a62cSLen Brown * 114c8f7a62cSLen Brown * Add the dependent device to the dock's dependent device list. 115c8f7a62cSLen Brown */ 116c8f7a62cSLen Brown static void 117c8f7a62cSLen Brown add_dock_dependent_device(struct dock_station *ds, 118c8f7a62cSLen Brown struct dock_dependent_device *dd) 119c8f7a62cSLen Brown { 120c8f7a62cSLen Brown spin_lock(&ds->dd_lock); 121c8f7a62cSLen Brown list_add_tail(&dd->list, &ds->dependent_devices); 122c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 123c8f7a62cSLen Brown } 124c8f7a62cSLen Brown 125c8f7a62cSLen Brown /** 126c8f7a62cSLen Brown * dock_add_hotplug_device - associate a hotplug handler with the dock station 127c8f7a62cSLen Brown * @ds: The dock station 128c8f7a62cSLen Brown * @dd: The dependent device struct 129c8f7a62cSLen Brown * 130c8f7a62cSLen Brown * Add the dependent device to the dock's hotplug device list 131c8f7a62cSLen Brown */ 132c8f7a62cSLen Brown static void 133c8f7a62cSLen Brown dock_add_hotplug_device(struct dock_station *ds, 134c8f7a62cSLen Brown struct dock_dependent_device *dd) 135c8f7a62cSLen Brown { 1368b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 137c8f7a62cSLen Brown list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); 1388b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 139c8f7a62cSLen Brown } 140c8f7a62cSLen Brown 141c8f7a62cSLen Brown /** 142c8f7a62cSLen Brown * dock_del_hotplug_device - remove a hotplug handler from the dock station 143c8f7a62cSLen Brown * @ds: The dock station 144c8f7a62cSLen Brown * @dd: the dependent device struct 145c8f7a62cSLen Brown * 146c8f7a62cSLen Brown * Delete the dependent device from the dock's hotplug device list 147c8f7a62cSLen Brown */ 148c8f7a62cSLen Brown static void 149c8f7a62cSLen Brown dock_del_hotplug_device(struct dock_station *ds, 150c8f7a62cSLen Brown struct dock_dependent_device *dd) 151c8f7a62cSLen Brown { 1528b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 153c8f7a62cSLen Brown list_del(&dd->hotplug_list); 1548b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 155c8f7a62cSLen Brown } 156c8f7a62cSLen Brown 157c8f7a62cSLen Brown /** 158c8f7a62cSLen Brown * find_dock_dependent_device - get a device dependent on this dock 159c8f7a62cSLen Brown * @ds: the dock station 160c8f7a62cSLen Brown * @handle: the acpi_handle of the device we want 161c8f7a62cSLen Brown * 162c8f7a62cSLen Brown * iterate over the dependent device list for this dock. If the 163c8f7a62cSLen Brown * dependent device matches the handle, return. 164c8f7a62cSLen Brown */ 165c8f7a62cSLen Brown static struct dock_dependent_device * 166c8f7a62cSLen Brown find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) 167c8f7a62cSLen Brown { 168c8f7a62cSLen Brown struct dock_dependent_device *dd; 169c8f7a62cSLen Brown 170c8f7a62cSLen Brown spin_lock(&ds->dd_lock); 171c8f7a62cSLen Brown list_for_each_entry(dd, &ds->dependent_devices, list) { 172c8f7a62cSLen Brown if (handle == dd->handle) { 173c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 174c8f7a62cSLen Brown return dd; 175c8f7a62cSLen Brown } 176c8f7a62cSLen Brown } 177c8f7a62cSLen Brown spin_unlock(&ds->dd_lock); 178c8f7a62cSLen Brown return NULL; 179c8f7a62cSLen Brown } 180c8f7a62cSLen Brown 181c8f7a62cSLen Brown /***************************************************************************** 182c8f7a62cSLen Brown * Dock functions * 183c8f7a62cSLen Brown *****************************************************************************/ 184c8f7a62cSLen Brown /** 185c8f7a62cSLen Brown * is_dock - see if a device is a dock station 186c8f7a62cSLen Brown * @handle: acpi handle of the device 187c8f7a62cSLen Brown * 188c8f7a62cSLen Brown * If an acpi object has a _DCK method, then it is by definition a dock 189c8f7a62cSLen Brown * station, so return true. 190c8f7a62cSLen Brown */ 191c8f7a62cSLen Brown static int is_dock(acpi_handle handle) 192c8f7a62cSLen Brown { 193c8f7a62cSLen Brown acpi_status status; 194c8f7a62cSLen Brown acpi_handle tmp; 195c8f7a62cSLen Brown 196c8f7a62cSLen Brown status = acpi_get_handle(handle, "_DCK", &tmp); 197c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 198c8f7a62cSLen Brown return 0; 199c8f7a62cSLen Brown return 1; 200c8f7a62cSLen Brown } 201c8f7a62cSLen Brown 202c8f7a62cSLen Brown /** 203c8f7a62cSLen Brown * is_dock_device - see if a device is on a dock station 204c8f7a62cSLen Brown * @handle: acpi handle of the device 205c8f7a62cSLen Brown * 206c8f7a62cSLen Brown * If this device is either the dock station itself, 207c8f7a62cSLen Brown * or is a device dependent on the dock station, then it 208c8f7a62cSLen Brown * is a dock device 209c8f7a62cSLen Brown */ 210c8f7a62cSLen Brown int is_dock_device(acpi_handle handle) 211c8f7a62cSLen Brown { 212c8f7a62cSLen Brown if (!dock_station) 213c8f7a62cSLen Brown return 0; 214c8f7a62cSLen Brown 215c8f7a62cSLen Brown if (is_dock(handle) || find_dock_dependent_device(dock_station, handle)) 216c8f7a62cSLen Brown return 1; 217c8f7a62cSLen Brown 218c8f7a62cSLen Brown return 0; 219c8f7a62cSLen Brown } 220c8f7a62cSLen Brown 221c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(is_dock_device); 222c8f7a62cSLen Brown 223c8f7a62cSLen Brown /** 224c8f7a62cSLen Brown * dock_present - see if the dock station is present. 225c8f7a62cSLen Brown * @ds: the dock station 226c8f7a62cSLen Brown * 227c8f7a62cSLen Brown * execute the _STA method. note that present does not 228c8f7a62cSLen Brown * imply that we are docked. 229c8f7a62cSLen Brown */ 230c8f7a62cSLen Brown static int dock_present(struct dock_station *ds) 231c8f7a62cSLen Brown { 232c8f7a62cSLen Brown unsigned long sta; 233c8f7a62cSLen Brown acpi_status status; 234c8f7a62cSLen Brown 235c8f7a62cSLen Brown if (ds) { 236c8f7a62cSLen Brown status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); 237c8f7a62cSLen Brown if (ACPI_SUCCESS(status) && sta) 238c8f7a62cSLen Brown return 1; 239c8f7a62cSLen Brown } 240c8f7a62cSLen Brown return 0; 241c8f7a62cSLen Brown } 242c8f7a62cSLen Brown 243c8f7a62cSLen Brown 244c8f7a62cSLen Brown 245c8f7a62cSLen Brown /** 246c8f7a62cSLen Brown * dock_create_acpi_device - add new devices to acpi 247c8f7a62cSLen Brown * @handle - handle of the device to add 248c8f7a62cSLen Brown * 249c8f7a62cSLen Brown * This function will create a new acpi_device for the given 250c8f7a62cSLen Brown * handle if one does not exist already. This should cause 251c8f7a62cSLen Brown * acpi to scan for drivers for the given devices, and call 252c8f7a62cSLen Brown * matching driver's add routine. 253c8f7a62cSLen Brown * 254c8f7a62cSLen Brown * Returns a pointer to the acpi_device corresponding to the handle. 255c8f7a62cSLen Brown */ 256c8f7a62cSLen Brown static struct acpi_device * dock_create_acpi_device(acpi_handle handle) 257c8f7a62cSLen Brown { 258c8f7a62cSLen Brown struct acpi_device *device = NULL; 259c8f7a62cSLen Brown struct acpi_device *parent_device; 260c8f7a62cSLen Brown acpi_handle parent; 261c8f7a62cSLen Brown int ret; 262c8f7a62cSLen Brown 263c8f7a62cSLen Brown if (acpi_bus_get_device(handle, &device)) { 264c8f7a62cSLen Brown /* 265c8f7a62cSLen Brown * no device created for this object, 266c8f7a62cSLen Brown * so we should create one. 267c8f7a62cSLen Brown */ 268c8f7a62cSLen Brown acpi_get_parent(handle, &parent); 269c8f7a62cSLen Brown if (acpi_bus_get_device(parent, &parent_device)) 270c8f7a62cSLen Brown parent_device = NULL; 271c8f7a62cSLen Brown 272c8f7a62cSLen Brown ret = acpi_bus_add(&device, parent_device, handle, 273c8f7a62cSLen Brown ACPI_BUS_TYPE_DEVICE); 274c8f7a62cSLen Brown if (ret) { 275c8f7a62cSLen Brown pr_debug("error adding bus, %x\n", 276c8f7a62cSLen Brown -ret); 277c8f7a62cSLen Brown return NULL; 278c8f7a62cSLen Brown } 279c8f7a62cSLen Brown } 280c8f7a62cSLen Brown return device; 281c8f7a62cSLen Brown } 282c8f7a62cSLen Brown 283c8f7a62cSLen Brown /** 284c8f7a62cSLen Brown * dock_remove_acpi_device - remove the acpi_device struct from acpi 285c8f7a62cSLen Brown * @handle - the handle of the device to remove 286c8f7a62cSLen Brown * 287c8f7a62cSLen Brown * Tell acpi to remove the acpi_device. This should cause any loaded 288c8f7a62cSLen Brown * driver to have it's remove routine called. 289c8f7a62cSLen Brown */ 290c8f7a62cSLen Brown static void dock_remove_acpi_device(acpi_handle handle) 291c8f7a62cSLen Brown { 292c8f7a62cSLen Brown struct acpi_device *device; 293c8f7a62cSLen Brown int ret; 294c8f7a62cSLen Brown 295c8f7a62cSLen Brown if (!acpi_bus_get_device(handle, &device)) { 296c8f7a62cSLen Brown ret = acpi_bus_trim(device, 1); 297c8f7a62cSLen Brown if (ret) 298c8f7a62cSLen Brown pr_debug("error removing bus, %x\n", -ret); 299c8f7a62cSLen Brown } 300c8f7a62cSLen Brown } 301c8f7a62cSLen Brown 302c8f7a62cSLen Brown 303c8f7a62cSLen Brown /** 304c8f7a62cSLen Brown * hotplug_dock_devices - insert or remove devices on the dock station 305c8f7a62cSLen Brown * @ds: the dock station 306c8f7a62cSLen Brown * @event: either bus check or eject request 307c8f7a62cSLen Brown * 308c8f7a62cSLen Brown * Some devices on the dock station need to have drivers called 309c8f7a62cSLen Brown * to perform hotplug operations after a dock event has occurred. 310c8f7a62cSLen Brown * Traverse the list of dock devices that have registered a 311c8f7a62cSLen Brown * hotplug handler, and call the handler. 312c8f7a62cSLen Brown */ 313c8f7a62cSLen Brown static void hotplug_dock_devices(struct dock_station *ds, u32 event) 314c8f7a62cSLen Brown { 315c8f7a62cSLen Brown struct dock_dependent_device *dd; 316c8f7a62cSLen Brown 3178b0dc866SKristen Carlson Accardi mutex_lock(&ds->hp_lock); 318c8f7a62cSLen Brown 319c8f7a62cSLen Brown /* 320c8f7a62cSLen Brown * First call driver specific hotplug functions 321c8f7a62cSLen Brown */ 322c8f7a62cSLen Brown list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) { 323c8f7a62cSLen Brown if (dd->handler) 324c8f7a62cSLen Brown dd->handler(dd->handle, event, dd->context); 325c8f7a62cSLen Brown } 326c8f7a62cSLen Brown 327c8f7a62cSLen Brown /* 328c8f7a62cSLen Brown * Now make sure that an acpi_device is created for each 329c8f7a62cSLen Brown * dependent device, or removed if this is an eject request. 330c8f7a62cSLen Brown * This will cause acpi_drivers to be stopped/started if they 331c8f7a62cSLen Brown * exist 332c8f7a62cSLen Brown */ 333c8f7a62cSLen Brown list_for_each_entry(dd, &ds->dependent_devices, list) { 334c8f7a62cSLen Brown if (event == ACPI_NOTIFY_EJECT_REQUEST) 335c8f7a62cSLen Brown dock_remove_acpi_device(dd->handle); 336c8f7a62cSLen Brown else 337c8f7a62cSLen Brown dock_create_acpi_device(dd->handle); 338c8f7a62cSLen Brown } 3398b0dc866SKristen Carlson Accardi mutex_unlock(&ds->hp_lock); 340c8f7a62cSLen Brown } 341c8f7a62cSLen Brown 342c8f7a62cSLen Brown static void dock_event(struct dock_station *ds, u32 event, int num) 343c8f7a62cSLen Brown { 3440f6f2804SKristen Carlson Accardi struct device *dev = &dock_device->dev; 34566b56821SHolger Macht char event_string[13]; 34679a8f70bSKristen Carlson Accardi char *envp[] = { event_string, NULL }; 34779a8f70bSKristen Carlson Accardi 34879a8f70bSKristen Carlson Accardi if (num == UNDOCK_EVENT) 34966b56821SHolger Macht sprintf(event_string, "EVENT=undock"); 35079a8f70bSKristen Carlson Accardi else 35166b56821SHolger Macht sprintf(event_string, "EVENT=dock"); 35279a8f70bSKristen Carlson Accardi 3535669021eSKristen Carlson Accardi /* 3548ea86e0bSKristen Carlson Accardi * Indicate that the status of the dock station has 3558ea86e0bSKristen Carlson Accardi * changed. 3565669021eSKristen Carlson Accardi */ 35779a8f70bSKristen Carlson Accardi kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 358c8f7a62cSLen Brown } 359c8f7a62cSLen Brown 360c8f7a62cSLen Brown /** 361c8f7a62cSLen Brown * eject_dock - respond to a dock eject request 362c8f7a62cSLen Brown * @ds: the dock station 363c8f7a62cSLen Brown * 364c8f7a62cSLen Brown * This is called after _DCK is called, to execute the dock station's 365c8f7a62cSLen Brown * _EJ0 method. 366c8f7a62cSLen Brown */ 367c8f7a62cSLen Brown static void eject_dock(struct dock_station *ds) 368c8f7a62cSLen Brown { 369c8f7a62cSLen Brown struct acpi_object_list arg_list; 370c8f7a62cSLen Brown union acpi_object arg; 371c8f7a62cSLen Brown acpi_status status; 372c8f7a62cSLen Brown acpi_handle tmp; 373c8f7a62cSLen Brown 374c8f7a62cSLen Brown /* all dock devices should have _EJ0, but check anyway */ 375c8f7a62cSLen Brown status = acpi_get_handle(ds->handle, "_EJ0", &tmp); 376c8f7a62cSLen Brown if (ACPI_FAILURE(status)) { 377c8f7a62cSLen Brown pr_debug("No _EJ0 support for dock device\n"); 378c8f7a62cSLen Brown return; 379c8f7a62cSLen Brown } 380c8f7a62cSLen Brown 381c8f7a62cSLen Brown arg_list.count = 1; 382c8f7a62cSLen Brown arg_list.pointer = &arg; 383c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 384c8f7a62cSLen Brown arg.integer.value = 1; 385c8f7a62cSLen Brown 386c8f7a62cSLen Brown if (ACPI_FAILURE(acpi_evaluate_object(ds->handle, "_EJ0", 387c8f7a62cSLen Brown &arg_list, NULL))) 388c8f7a62cSLen Brown pr_debug("Failed to evaluate _EJ0!\n"); 389c8f7a62cSLen Brown } 390c8f7a62cSLen Brown 391c8f7a62cSLen Brown /** 392c8f7a62cSLen Brown * handle_dock - handle a dock event 393c8f7a62cSLen Brown * @ds: the dock station 394c8f7a62cSLen Brown * @dock: to dock, or undock - that is the question 395c8f7a62cSLen Brown * 396c8f7a62cSLen Brown * Execute the _DCK method in response to an acpi event 397c8f7a62cSLen Brown */ 398c8f7a62cSLen Brown static void handle_dock(struct dock_station *ds, int dock) 399c8f7a62cSLen Brown { 400c8f7a62cSLen Brown acpi_status status; 401c8f7a62cSLen Brown struct acpi_object_list arg_list; 402c8f7a62cSLen Brown union acpi_object arg; 403c8f7a62cSLen Brown struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 404c8f7a62cSLen Brown struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 405c8f7a62cSLen Brown 406c8f7a62cSLen Brown acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); 407c8f7a62cSLen Brown 4089254bc84SDmitry Torokhov printk(KERN_INFO PREFIX "%s - %s\n", 4099254bc84SDmitry Torokhov (char *)name_buffer.pointer, dock ? "docking" : "undocking"); 410c8f7a62cSLen Brown 411c8f7a62cSLen Brown /* _DCK method has one argument */ 412c8f7a62cSLen Brown arg_list.count = 1; 413c8f7a62cSLen Brown arg_list.pointer = &arg; 414c8f7a62cSLen Brown arg.type = ACPI_TYPE_INTEGER; 415c8f7a62cSLen Brown arg.integer.value = dock; 416c8f7a62cSLen Brown status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); 417c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 4189254bc84SDmitry Torokhov printk(KERN_ERR PREFIX "%s - failed to execute _DCK\n", 4199254bc84SDmitry Torokhov (char *)name_buffer.pointer); 420c8f7a62cSLen Brown kfree(buffer.pointer); 421c8f7a62cSLen Brown kfree(name_buffer.pointer); 422c8f7a62cSLen Brown } 423c8f7a62cSLen Brown 424c8f7a62cSLen Brown static inline void dock(struct dock_station *ds) 425c8f7a62cSLen Brown { 426c8f7a62cSLen Brown handle_dock(ds, 1); 427c8f7a62cSLen Brown } 428c8f7a62cSLen Brown 429c8f7a62cSLen Brown static inline void undock(struct dock_station *ds) 430c8f7a62cSLen Brown { 431c8f7a62cSLen Brown handle_dock(ds, 0); 432c8f7a62cSLen Brown } 433c8f7a62cSLen Brown 434c8f7a62cSLen Brown static inline void begin_dock(struct dock_station *ds) 435c8f7a62cSLen Brown { 436c8f7a62cSLen Brown ds->flags |= DOCK_DOCKING; 437c8f7a62cSLen Brown } 438c8f7a62cSLen Brown 439c8f7a62cSLen Brown static inline void complete_dock(struct dock_station *ds) 440c8f7a62cSLen Brown { 441c8f7a62cSLen Brown ds->flags &= ~(DOCK_DOCKING); 442c8f7a62cSLen Brown ds->last_dock_time = jiffies; 443c8f7a62cSLen Brown } 444c8f7a62cSLen Brown 445a0cd35fdSKristen Carlson Accardi static inline void begin_undock(struct dock_station *ds) 446a0cd35fdSKristen Carlson Accardi { 447a0cd35fdSKristen Carlson Accardi ds->flags |= DOCK_UNDOCKING; 448a0cd35fdSKristen Carlson Accardi } 449a0cd35fdSKristen Carlson Accardi 450a0cd35fdSKristen Carlson Accardi static inline void complete_undock(struct dock_station *ds) 451a0cd35fdSKristen Carlson Accardi { 452a0cd35fdSKristen Carlson Accardi ds->flags &= ~(DOCK_UNDOCKING); 453a0cd35fdSKristen Carlson Accardi } 454a0cd35fdSKristen Carlson Accardi 455c8f7a62cSLen Brown /** 456c8f7a62cSLen Brown * dock_in_progress - see if we are in the middle of handling a dock event 457c8f7a62cSLen Brown * @ds: the dock station 458c8f7a62cSLen Brown * 459c8f7a62cSLen Brown * Sometimes while docking, false dock events can be sent to the driver 460c8f7a62cSLen Brown * because good connections aren't made or some other reason. Ignore these 461c8f7a62cSLen Brown * if we are in the middle of doing something. 462c8f7a62cSLen Brown */ 463c8f7a62cSLen Brown static int dock_in_progress(struct dock_station *ds) 464c8f7a62cSLen Brown { 465c8f7a62cSLen Brown if ((ds->flags & DOCK_DOCKING) || 466c8f7a62cSLen Brown time_before(jiffies, (ds->last_dock_time + HZ))) 467c8f7a62cSLen Brown return 1; 468c8f7a62cSLen Brown return 0; 469c8f7a62cSLen Brown } 470c8f7a62cSLen Brown 471c8f7a62cSLen Brown /** 472c8f7a62cSLen Brown * register_dock_notifier - add yourself to the dock notifier list 473c8f7a62cSLen Brown * @nb: the callers notifier block 474c8f7a62cSLen Brown * 475c8f7a62cSLen Brown * If a driver wishes to be notified about dock events, they can 476c8f7a62cSLen Brown * use this function to put a notifier block on the dock notifier list. 477c8f7a62cSLen Brown * this notifier call chain will be called after a dock event, but 478c8f7a62cSLen Brown * before hotplugging any new devices. 479c8f7a62cSLen Brown */ 480c8f7a62cSLen Brown int register_dock_notifier(struct notifier_block *nb) 481c8f7a62cSLen Brown { 4822548c06bSPrarit Bhargava if (!dock_station) 4832548c06bSPrarit Bhargava return -ENODEV; 4842548c06bSPrarit Bhargava 485c8f7a62cSLen Brown return atomic_notifier_chain_register(&dock_notifier_list, nb); 486c8f7a62cSLen Brown } 487c8f7a62cSLen Brown 488c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_dock_notifier); 489c8f7a62cSLen Brown 490c8f7a62cSLen Brown /** 491c8f7a62cSLen Brown * unregister_dock_notifier - remove yourself from the dock notifier list 492c8f7a62cSLen Brown * @nb: the callers notifier block 493c8f7a62cSLen Brown */ 494c8f7a62cSLen Brown void unregister_dock_notifier(struct notifier_block *nb) 495c8f7a62cSLen Brown { 4962548c06bSPrarit Bhargava if (!dock_station) 4972548c06bSPrarit Bhargava return; 4982548c06bSPrarit Bhargava 499c8f7a62cSLen Brown atomic_notifier_chain_unregister(&dock_notifier_list, nb); 500c8f7a62cSLen Brown } 501c8f7a62cSLen Brown 502c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_dock_notifier); 503c8f7a62cSLen Brown 504c8f7a62cSLen Brown /** 505c8f7a62cSLen Brown * register_hotplug_dock_device - register a hotplug function 506c8f7a62cSLen Brown * @handle: the handle of the device 507c8f7a62cSLen Brown * @handler: the acpi_notifier_handler to call after docking 508c8f7a62cSLen Brown * @context: device specific data 509c8f7a62cSLen Brown * 510c8f7a62cSLen Brown * If a driver would like to perform a hotplug operation after a dock 511c8f7a62cSLen Brown * event, they can register an acpi_notifiy_handler to be called by 512c8f7a62cSLen Brown * the dock driver after _DCK is executed. 513c8f7a62cSLen Brown */ 514c8f7a62cSLen Brown int 515c8f7a62cSLen Brown register_hotplug_dock_device(acpi_handle handle, acpi_notify_handler handler, 516c8f7a62cSLen Brown void *context) 517c8f7a62cSLen Brown { 518c8f7a62cSLen Brown struct dock_dependent_device *dd; 519c8f7a62cSLen Brown 520c8f7a62cSLen Brown if (!dock_station) 521c8f7a62cSLen Brown return -ENODEV; 522c8f7a62cSLen Brown 523c8f7a62cSLen Brown /* 524c8f7a62cSLen Brown * make sure this handle is for a device dependent on the dock, 525c8f7a62cSLen Brown * this would include the dock station itself 526c8f7a62cSLen Brown */ 527c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 528c8f7a62cSLen Brown if (dd) { 529c8f7a62cSLen Brown dd->handler = handler; 530c8f7a62cSLen Brown dd->context = context; 531c8f7a62cSLen Brown dock_add_hotplug_device(dock_station, dd); 532c8f7a62cSLen Brown return 0; 533c8f7a62cSLen Brown } 534c8f7a62cSLen Brown 535c8f7a62cSLen Brown return -EINVAL; 536c8f7a62cSLen Brown } 537c8f7a62cSLen Brown 538c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(register_hotplug_dock_device); 539c8f7a62cSLen Brown 540c8f7a62cSLen Brown /** 541c8f7a62cSLen Brown * unregister_hotplug_dock_device - remove yourself from the hotplug list 542c8f7a62cSLen Brown * @handle: the acpi handle of the device 543c8f7a62cSLen Brown */ 544c8f7a62cSLen Brown void unregister_hotplug_dock_device(acpi_handle handle) 545c8f7a62cSLen Brown { 546c8f7a62cSLen Brown struct dock_dependent_device *dd; 547c8f7a62cSLen Brown 548c8f7a62cSLen Brown if (!dock_station) 549c8f7a62cSLen Brown return; 550c8f7a62cSLen Brown 551c8f7a62cSLen Brown dd = find_dock_dependent_device(dock_station, handle); 552c8f7a62cSLen Brown if (dd) 553c8f7a62cSLen Brown dock_del_hotplug_device(dock_station, dd); 554c8f7a62cSLen Brown } 555c8f7a62cSLen Brown 556c8f7a62cSLen Brown EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); 557c8f7a62cSLen Brown 558c8f7a62cSLen Brown /** 559c80fdbe8Sbrandon@ifup.org * handle_eject_request - handle an undock request checking for error conditions 560c80fdbe8Sbrandon@ifup.org * 561c80fdbe8Sbrandon@ifup.org * Check to make sure the dock device is still present, then undock and 562c80fdbe8Sbrandon@ifup.org * hotremove all the devices that may need removing. 563c80fdbe8Sbrandon@ifup.org */ 564c80fdbe8Sbrandon@ifup.org static int handle_eject_request(struct dock_station *ds, u32 event) 565c80fdbe8Sbrandon@ifup.org { 566c80fdbe8Sbrandon@ifup.org if (dock_in_progress(ds)) 567c80fdbe8Sbrandon@ifup.org return -EBUSY; 568c80fdbe8Sbrandon@ifup.org 569c80fdbe8Sbrandon@ifup.org /* 570c80fdbe8Sbrandon@ifup.org * here we need to generate the undock 571c80fdbe8Sbrandon@ifup.org * event prior to actually doing the undock 572c80fdbe8Sbrandon@ifup.org * so that the device struct still exists. 573afd7301dSHolger Macht * Also, even send the dock event if the 574afd7301dSHolger Macht * device is not present anymore 575c80fdbe8Sbrandon@ifup.org */ 576c80fdbe8Sbrandon@ifup.org dock_event(ds, event, UNDOCK_EVENT); 577afd7301dSHolger Macht 578afd7301dSHolger Macht if (!dock_present(ds)) { 579afd7301dSHolger Macht complete_undock(ds); 580afd7301dSHolger Macht return -ENODEV; 581afd7301dSHolger Macht } 582afd7301dSHolger Macht 583c80fdbe8Sbrandon@ifup.org hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); 584c80fdbe8Sbrandon@ifup.org undock(ds); 585c80fdbe8Sbrandon@ifup.org eject_dock(ds); 586c80fdbe8Sbrandon@ifup.org if (dock_present(ds)) { 587c80fdbe8Sbrandon@ifup.org printk(KERN_ERR PREFIX "Unable to undock!\n"); 588c80fdbe8Sbrandon@ifup.org return -EBUSY; 589c80fdbe8Sbrandon@ifup.org } 590a0cd35fdSKristen Carlson Accardi complete_undock(ds); 591c80fdbe8Sbrandon@ifup.org return 0; 592c80fdbe8Sbrandon@ifup.org } 593c80fdbe8Sbrandon@ifup.org 594c80fdbe8Sbrandon@ifup.org /** 595c8f7a62cSLen Brown * dock_notify - act upon an acpi dock notification 596c8f7a62cSLen Brown * @handle: the dock station handle 597c8f7a62cSLen Brown * @event: the acpi event 598c8f7a62cSLen Brown * @data: our driver data struct 599c8f7a62cSLen Brown * 600c8f7a62cSLen Brown * If we are notified to dock, then check to see if the dock is 601c8f7a62cSLen Brown * present and then dock. Notify all drivers of the dock event, 602c80fdbe8Sbrandon@ifup.org * and then hotplug and devices that may need hotplugging. 603c8f7a62cSLen Brown */ 604c8f7a62cSLen Brown static void dock_notify(acpi_handle handle, u32 event, void *data) 605c8f7a62cSLen Brown { 60650dd0969SJan Engelhardt struct dock_station *ds = data; 6078b59560aSShaohua Li struct acpi_device *tmp; 608c8f7a62cSLen Brown 609c8f7a62cSLen Brown switch (event) { 610c8f7a62cSLen Brown case ACPI_NOTIFY_BUS_CHECK: 6118b59560aSShaohua Li if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, 6128b59560aSShaohua Li &tmp)) { 613c8f7a62cSLen Brown begin_dock(ds); 614c8f7a62cSLen Brown dock(ds); 615c8f7a62cSLen Brown if (!dock_present(ds)) { 616c8f7a62cSLen Brown printk(KERN_ERR PREFIX "Unable to dock!\n"); 6178b59560aSShaohua Li complete_dock(ds); 618c8f7a62cSLen Brown break; 619c8f7a62cSLen Brown } 620c8f7a62cSLen Brown atomic_notifier_call_chain(&dock_notifier_list, 621c8f7a62cSLen Brown event, NULL); 622c8f7a62cSLen Brown hotplug_dock_devices(ds, event); 623c8f7a62cSLen Brown complete_dock(ds); 624c8f7a62cSLen Brown dock_event(ds, event, DOCK_EVENT); 625c8f7a62cSLen Brown } 626c8f7a62cSLen Brown break; 627c8f7a62cSLen Brown case ACPI_NOTIFY_DEVICE_CHECK: 628c8f7a62cSLen Brown /* 629c8f7a62cSLen Brown * According to acpi spec 3.0a, if a DEVICE_CHECK notification 630c8f7a62cSLen Brown * is sent and _DCK is present, it is assumed to mean an 631c8f7a62cSLen Brown * undock request. This notify routine will only be called 632c8f7a62cSLen Brown * for objects defining _DCK, so we will fall through to eject 633c8f7a62cSLen Brown * request here. However, we will pass an eject request through 634c8f7a62cSLen Brown * to the driver who wish to hotplug. 635c8f7a62cSLen Brown */ 636c8f7a62cSLen Brown case ACPI_NOTIFY_EJECT_REQUEST: 637a0cd35fdSKristen Carlson Accardi begin_undock(ds); 638a0cd35fdSKristen Carlson Accardi if (immediate_undock) 639c80fdbe8Sbrandon@ifup.org handle_eject_request(ds, event); 640a0cd35fdSKristen Carlson Accardi else 641a0cd35fdSKristen Carlson Accardi dock_event(ds, event, UNDOCK_EVENT); 642c8f7a62cSLen Brown break; 643c8f7a62cSLen Brown default: 644c8f7a62cSLen Brown printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); 645c8f7a62cSLen Brown } 646c8f7a62cSLen Brown } 647c8f7a62cSLen Brown 648c8f7a62cSLen Brown /** 649c8f7a62cSLen Brown * find_dock_devices - find devices on the dock station 650c8f7a62cSLen Brown * @handle: the handle of the device we are examining 651c8f7a62cSLen Brown * @lvl: unused 652c8f7a62cSLen Brown * @context: the dock station private data 653c8f7a62cSLen Brown * @rv: unused 654c8f7a62cSLen Brown * 655c8f7a62cSLen Brown * This function is called by acpi_walk_namespace. It will 656c8f7a62cSLen Brown * check to see if an object has an _EJD method. If it does, then it 657c8f7a62cSLen Brown * will see if it is dependent on the dock station. 658c8f7a62cSLen Brown */ 659c8f7a62cSLen Brown static acpi_status 660c8f7a62cSLen Brown find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) 661c8f7a62cSLen Brown { 662c8f7a62cSLen Brown acpi_status status; 663fe9a2f77SKristen Carlson Accardi acpi_handle tmp, parent; 66450dd0969SJan Engelhardt struct dock_station *ds = context; 665c8f7a62cSLen Brown struct dock_dependent_device *dd; 666c8f7a62cSLen Brown 667c8f7a62cSLen Brown status = acpi_bus_get_ejd(handle, &tmp); 668fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) { 669fe9a2f77SKristen Carlson Accardi /* try the parent device as well */ 670fe9a2f77SKristen Carlson Accardi status = acpi_get_parent(handle, &parent); 671c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 672fe9a2f77SKristen Carlson Accardi goto fdd_out; 673fe9a2f77SKristen Carlson Accardi /* see if parent is dependent on dock */ 674fe9a2f77SKristen Carlson Accardi status = acpi_bus_get_ejd(parent, &tmp); 675fe9a2f77SKristen Carlson Accardi if (ACPI_FAILURE(status)) 676fe9a2f77SKristen Carlson Accardi goto fdd_out; 677fe9a2f77SKristen Carlson Accardi } 678c8f7a62cSLen Brown 679c8f7a62cSLen Brown if (tmp == ds->handle) { 680c8f7a62cSLen Brown dd = alloc_dock_dependent_device(handle); 681c8f7a62cSLen Brown if (dd) 682c8f7a62cSLen Brown add_dock_dependent_device(ds, dd); 683c8f7a62cSLen Brown } 684fe9a2f77SKristen Carlson Accardi fdd_out: 685c8f7a62cSLen Brown return AE_OK; 686c8f7a62cSLen Brown } 687c8f7a62cSLen Brown 688c80fdbe8Sbrandon@ifup.org /* 689c80fdbe8Sbrandon@ifup.org * show_docked - read method for "docked" file in sysfs 690c80fdbe8Sbrandon@ifup.org */ 691c80fdbe8Sbrandon@ifup.org static ssize_t show_docked(struct device *dev, 692c80fdbe8Sbrandon@ifup.org struct device_attribute *attr, char *buf) 693c80fdbe8Sbrandon@ifup.org { 694c80fdbe8Sbrandon@ifup.org return snprintf(buf, PAGE_SIZE, "%d\n", dock_present(dock_station)); 695c80fdbe8Sbrandon@ifup.org 696c80fdbe8Sbrandon@ifup.org } 697e5685b9dSAdrian Bunk static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); 698c80fdbe8Sbrandon@ifup.org 699c80fdbe8Sbrandon@ifup.org /* 700a0cd35fdSKristen Carlson Accardi * show_flags - read method for flags file in sysfs 701a0cd35fdSKristen Carlson Accardi */ 702a0cd35fdSKristen Carlson Accardi static ssize_t show_flags(struct device *dev, 703a0cd35fdSKristen Carlson Accardi struct device_attribute *attr, char *buf) 704a0cd35fdSKristen Carlson Accardi { 705a0cd35fdSKristen Carlson Accardi return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); 706a0cd35fdSKristen Carlson Accardi 707a0cd35fdSKristen Carlson Accardi } 708e5685b9dSAdrian Bunk static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); 709a0cd35fdSKristen Carlson Accardi 710a0cd35fdSKristen Carlson Accardi /* 711c80fdbe8Sbrandon@ifup.org * write_undock - write method for "undock" file in sysfs 712c80fdbe8Sbrandon@ifup.org */ 713c80fdbe8Sbrandon@ifup.org static ssize_t write_undock(struct device *dev, struct device_attribute *attr, 714c80fdbe8Sbrandon@ifup.org const char *buf, size_t count) 715c80fdbe8Sbrandon@ifup.org { 716c80fdbe8Sbrandon@ifup.org int ret; 717c80fdbe8Sbrandon@ifup.org 718c80fdbe8Sbrandon@ifup.org if (!count) 719c80fdbe8Sbrandon@ifup.org return -EINVAL; 720c80fdbe8Sbrandon@ifup.org 7219171f834SHolger Macht begin_undock(dock_station); 722c80fdbe8Sbrandon@ifup.org ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); 723c80fdbe8Sbrandon@ifup.org return ret ? ret: count; 724c80fdbe8Sbrandon@ifup.org } 725e5685b9dSAdrian Bunk static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); 726c80fdbe8Sbrandon@ifup.org 727ac122bb6SIlya A. Volynets-Evenbakh /* 728ac122bb6SIlya A. Volynets-Evenbakh * show_dock_uid - read method for "uid" file in sysfs 729ac122bb6SIlya A. Volynets-Evenbakh */ 730ac122bb6SIlya A. Volynets-Evenbakh static ssize_t show_dock_uid(struct device *dev, 731ac122bb6SIlya A. Volynets-Evenbakh struct device_attribute *attr, char *buf) 732ac122bb6SIlya A. Volynets-Evenbakh { 733ac122bb6SIlya A. Volynets-Evenbakh unsigned long lbuf; 73438ff4ffcSKristen Carlson Accardi acpi_status status = acpi_evaluate_integer(dock_station->handle, 73538ff4ffcSKristen Carlson Accardi "_UID", NULL, &lbuf); 73638ff4ffcSKristen Carlson Accardi if (ACPI_FAILURE(status)) 737ac122bb6SIlya A. Volynets-Evenbakh return 0; 73838ff4ffcSKristen Carlson Accardi 739ac122bb6SIlya A. Volynets-Evenbakh return snprintf(buf, PAGE_SIZE, "%lx\n", lbuf); 740ac122bb6SIlya A. Volynets-Evenbakh } 741e5685b9dSAdrian Bunk static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); 742ac122bb6SIlya A. Volynets-Evenbakh 743c8f7a62cSLen Brown /** 744c8f7a62cSLen Brown * dock_add - add a new dock station 745c8f7a62cSLen Brown * @handle: the dock station handle 746c8f7a62cSLen Brown * 747c8f7a62cSLen Brown * allocated and initialize a new dock station device. Find all devices 748c8f7a62cSLen Brown * that are on the dock station, and register for dock event notifications. 749c8f7a62cSLen Brown */ 750c8f7a62cSLen Brown static int dock_add(acpi_handle handle) 751c8f7a62cSLen Brown { 752c8f7a62cSLen Brown int ret; 753c8f7a62cSLen Brown acpi_status status; 754c8f7a62cSLen Brown struct dock_dependent_device *dd; 755c8f7a62cSLen Brown 756c8f7a62cSLen Brown /* allocate & initialize the dock_station private data */ 757c8f7a62cSLen Brown dock_station = kzalloc(sizeof(*dock_station), GFP_KERNEL); 758c8f7a62cSLen Brown if (!dock_station) 759c8f7a62cSLen Brown return -ENOMEM; 760c8f7a62cSLen Brown dock_station->handle = handle; 761c8f7a62cSLen Brown dock_station->last_dock_time = jiffies - HZ; 762c8f7a62cSLen Brown INIT_LIST_HEAD(&dock_station->dependent_devices); 763c8f7a62cSLen Brown INIT_LIST_HEAD(&dock_station->hotplug_devices); 764c8f7a62cSLen Brown spin_lock_init(&dock_station->dd_lock); 7658b0dc866SKristen Carlson Accardi mutex_init(&dock_station->hp_lock); 76607a18684SKristen Accardi ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); 767c8f7a62cSLen Brown 768671adbecSKristen Carlson Accardi /* initialize platform device stuff */ 7690f6f2804SKristen Carlson Accardi dock_device = 7700f6f2804SKristen Carlson Accardi platform_device_register_simple(dock_device_name, 0, NULL, 0); 7710f6f2804SKristen Carlson Accardi if (IS_ERR(dock_device)) { 7720f6f2804SKristen Carlson Accardi kfree(dock_station); 7730f6f2804SKristen Carlson Accardi dock_station = NULL; 7740f6f2804SKristen Carlson Accardi return PTR_ERR(dock_device); 7750f6f2804SKristen Carlson Accardi } 776a0cd35fdSKristen Carlson Accardi 7779ef2a9a9SKristen Carlson Accardi /* we want the dock device to send uevents */ 7789ef2a9a9SKristen Carlson Accardi dock_device->dev.uevent_suppress = 0; 7799ef2a9a9SKristen Carlson Accardi 7800f6f2804SKristen Carlson Accardi ret = device_create_file(&dock_device->dev, &dev_attr_docked); 781671adbecSKristen Carlson Accardi if (ret) { 7820f6f2804SKristen Carlson Accardi printk("Error %d adding sysfs file\n", ret); 7830f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 784671adbecSKristen Carlson Accardi kfree(dock_station); 78522fe4c21SChuck Ebbert dock_station = NULL; 786671adbecSKristen Carlson Accardi return ret; 787671adbecSKristen Carlson Accardi } 7880f6f2804SKristen Carlson Accardi ret = device_create_file(&dock_device->dev, &dev_attr_undock); 789c80fdbe8Sbrandon@ifup.org if (ret) { 790c80fdbe8Sbrandon@ifup.org printk("Error %d adding sysfs file\n", ret); 7910f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_docked); 7920f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 793c80fdbe8Sbrandon@ifup.org kfree(dock_station); 79422fe4c21SChuck Ebbert dock_station = NULL; 795c80fdbe8Sbrandon@ifup.org return ret; 796c80fdbe8Sbrandon@ifup.org } 7970f6f2804SKristen Carlson Accardi ret = device_create_file(&dock_device->dev, &dev_attr_uid); 798c80fdbe8Sbrandon@ifup.org if (ret) { 799c80fdbe8Sbrandon@ifup.org printk("Error %d adding sysfs file\n", ret); 8000f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_docked); 8010f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_undock); 8020f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 803ac122bb6SIlya A. Volynets-Evenbakh kfree(dock_station); 80422fe4c21SChuck Ebbert dock_station = NULL; 805ac122bb6SIlya A. Volynets-Evenbakh return ret; 806ac122bb6SIlya A. Volynets-Evenbakh } 807a0cd35fdSKristen Carlson Accardi ret = device_create_file(&dock_device->dev, &dev_attr_flags); 808a0cd35fdSKristen Carlson Accardi if (ret) { 809a0cd35fdSKristen Carlson Accardi printk("Error %d adding sysfs file\n", ret); 810a0cd35fdSKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_docked); 811a0cd35fdSKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_undock); 812a0cd35fdSKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_uid); 813a0cd35fdSKristen Carlson Accardi platform_device_unregister(dock_device); 814a0cd35fdSKristen Carlson Accardi kfree(dock_station); 815a0cd35fdSKristen Carlson Accardi dock_station = NULL; 816a0cd35fdSKristen Carlson Accardi return ret; 817a0cd35fdSKristen Carlson Accardi } 818671adbecSKristen Carlson Accardi 819c8f7a62cSLen Brown /* Find dependent devices */ 820c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 821c8f7a62cSLen Brown ACPI_UINT32_MAX, find_dock_devices, dock_station, 822c8f7a62cSLen Brown NULL); 823c8f7a62cSLen Brown 824c8f7a62cSLen Brown /* add the dock station as a device dependent on itself */ 825c8f7a62cSLen Brown dd = alloc_dock_dependent_device(handle); 826c8f7a62cSLen Brown if (!dd) { 827c8f7a62cSLen Brown kfree(dock_station); 82822fe4c21SChuck Ebbert dock_station = NULL; 829671adbecSKristen Carlson Accardi ret = -ENOMEM; 830671adbecSKristen Carlson Accardi goto dock_add_err_unregister; 831c8f7a62cSLen Brown } 832c8f7a62cSLen Brown add_dock_dependent_device(dock_station, dd); 833c8f7a62cSLen Brown 834c8f7a62cSLen Brown /* register for dock events */ 835c8f7a62cSLen Brown status = acpi_install_notify_handler(dock_station->handle, 836c8f7a62cSLen Brown ACPI_SYSTEM_NOTIFY, 837c8f7a62cSLen Brown dock_notify, dock_station); 838c8f7a62cSLen Brown 839c8f7a62cSLen Brown if (ACPI_FAILURE(status)) { 840c8f7a62cSLen Brown printk(KERN_ERR PREFIX "Error installing notify handler\n"); 841c8f7a62cSLen Brown ret = -ENODEV; 842c8f7a62cSLen Brown goto dock_add_err; 843c8f7a62cSLen Brown } 844c8f7a62cSLen Brown 8457cda93e0SLen Brown printk(KERN_INFO PREFIX "%s\n", ACPI_DOCK_DRIVER_DESCRIPTION); 846c8f7a62cSLen Brown 847c8f7a62cSLen Brown return 0; 848c8f7a62cSLen Brown 849c8f7a62cSLen Brown dock_add_err: 850c8f7a62cSLen Brown kfree(dd); 851671adbecSKristen Carlson Accardi dock_add_err_unregister: 8520f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_docked); 8530f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_undock); 8540f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_uid); 855a0cd35fdSKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_flags); 8560f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 857671adbecSKristen Carlson Accardi kfree(dock_station); 85822fe4c21SChuck Ebbert dock_station = NULL; 859c8f7a62cSLen Brown return ret; 860c8f7a62cSLen Brown } 861c8f7a62cSLen Brown 862c8f7a62cSLen Brown /** 863c8f7a62cSLen Brown * dock_remove - free up resources related to the dock station 864c8f7a62cSLen Brown */ 865c8f7a62cSLen Brown static int dock_remove(void) 866c8f7a62cSLen Brown { 867c8f7a62cSLen Brown struct dock_dependent_device *dd, *tmp; 868c8f7a62cSLen Brown acpi_status status; 869c8f7a62cSLen Brown 870c8f7a62cSLen Brown if (!dock_station) 871c8f7a62cSLen Brown return 0; 872c8f7a62cSLen Brown 873c8f7a62cSLen Brown /* remove dependent devices */ 874c8f7a62cSLen Brown list_for_each_entry_safe(dd, tmp, &dock_station->dependent_devices, 875c8f7a62cSLen Brown list) 876c8f7a62cSLen Brown kfree(dd); 877c8f7a62cSLen Brown 878c8f7a62cSLen Brown /* remove dock notify handler */ 879c8f7a62cSLen Brown status = acpi_remove_notify_handler(dock_station->handle, 880c8f7a62cSLen Brown ACPI_SYSTEM_NOTIFY, 881c8f7a62cSLen Brown dock_notify); 882c8f7a62cSLen Brown if (ACPI_FAILURE(status)) 883c8f7a62cSLen Brown printk(KERN_ERR "Error removing notify handler\n"); 884c8f7a62cSLen Brown 885671adbecSKristen Carlson Accardi /* cleanup sysfs */ 8860f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_docked); 8870f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_undock); 8880f6f2804SKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_uid); 889a0cd35fdSKristen Carlson Accardi device_remove_file(&dock_device->dev, &dev_attr_flags); 8900f6f2804SKristen Carlson Accardi platform_device_unregister(dock_device); 891671adbecSKristen Carlson Accardi 892c8f7a62cSLen Brown /* free dock station memory */ 893c8f7a62cSLen Brown kfree(dock_station); 89422fe4c21SChuck Ebbert dock_station = NULL; 895c8f7a62cSLen Brown return 0; 896c8f7a62cSLen Brown } 897c8f7a62cSLen Brown 898c8f7a62cSLen Brown /** 899c8f7a62cSLen Brown * find_dock - look for a dock station 900c8f7a62cSLen Brown * @handle: acpi handle of a device 901c8f7a62cSLen Brown * @lvl: unused 902c8f7a62cSLen Brown * @context: counter of dock stations found 903c8f7a62cSLen Brown * @rv: unused 904c8f7a62cSLen Brown * 905c8f7a62cSLen Brown * This is called by acpi_walk_namespace to look for dock stations. 906c8f7a62cSLen Brown */ 907c8f7a62cSLen Brown static acpi_status 908c8f7a62cSLen Brown find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) 909c8f7a62cSLen Brown { 91050dd0969SJan Engelhardt int *count = context; 911c8f7a62cSLen Brown acpi_status status = AE_OK; 912c8f7a62cSLen Brown 913c8f7a62cSLen Brown if (is_dock(handle)) { 914c8f7a62cSLen Brown if (dock_add(handle) >= 0) { 915c8f7a62cSLen Brown (*count)++; 916c8f7a62cSLen Brown status = AE_CTRL_TERMINATE; 917c8f7a62cSLen Brown } 918c8f7a62cSLen Brown } 919c8f7a62cSLen Brown return status; 920c8f7a62cSLen Brown } 921c8f7a62cSLen Brown 922c8f7a62cSLen Brown static int __init dock_init(void) 923c8f7a62cSLen Brown { 924c8f7a62cSLen Brown int num = 0; 925c8f7a62cSLen Brown 926c8f7a62cSLen Brown dock_station = NULL; 927c8f7a62cSLen Brown 928816c2edaSLen Brown if (acpi_disabled) 929816c2edaSLen Brown return 0; 930816c2edaSLen Brown 931c8f7a62cSLen Brown /* look for a dock station */ 932c8f7a62cSLen Brown acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 933c8f7a62cSLen Brown ACPI_UINT32_MAX, find_dock, &num, NULL); 934c8f7a62cSLen Brown 935c8f7a62cSLen Brown if (!num) 9362548c06bSPrarit Bhargava printk(KERN_INFO "No dock devices found.\n"); 937c8f7a62cSLen Brown 938c8f7a62cSLen Brown return 0; 939c8f7a62cSLen Brown } 940c8f7a62cSLen Brown 941c8f7a62cSLen Brown static void __exit dock_exit(void) 942c8f7a62cSLen Brown { 943c8f7a62cSLen Brown dock_remove(); 944c8f7a62cSLen Brown } 945c8f7a62cSLen Brown 946c8f7a62cSLen Brown postcore_initcall(dock_init); 947c8f7a62cSLen Brown module_exit(dock_exit); 948