| 1 | /* |
| 2 | * dock.c - ACPI dock station driver |
| 3 | * |
| 4 | * Copyright (C) 2006, 2014, Intel Corp. |
| 5 | * Author: Kristen Carlson Accardi <kristen.c.accardi@intel.com> |
| 6 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| 7 | * |
| 8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/notifier.h> |
| 29 | #include <linux/platform_device.h> |
| 30 | #include <linux/jiffies.h> |
| 31 | #include <linux/stddef.h> |
| 32 | #include <linux/acpi.h> |
| 33 | |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" |
| 37 | |
| 38 | ACPI_MODULE_NAME("dock"); |
| 39 | MODULE_AUTHOR("Kristen Carlson Accardi"); |
| 40 | MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); |
| 41 | MODULE_LICENSE("GPL"); |
| 42 | |
| 43 | static bool immediate_undock = 1; |
| 44 | module_param(immediate_undock, bool, 0644); |
| 45 | MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " |
| 46 | "undock immediately when the undock button is pressed, 0 will cause" |
| 47 | " the driver to wait for userspace to write the undock sysfs file " |
| 48 | " before undocking"); |
| 49 | |
| 50 | struct dock_station { |
| 51 | acpi_handle handle; |
| 52 | unsigned long last_dock_time; |
| 53 | u32 flags; |
| 54 | struct list_head dependent_devices; |
| 55 | |
| 56 | struct list_head sibling; |
| 57 | struct platform_device *dock_device; |
| 58 | }; |
| 59 | static LIST_HEAD(dock_stations); |
| 60 | static int dock_station_count; |
| 61 | |
| 62 | struct dock_dependent_device { |
| 63 | struct list_head list; |
| 64 | struct acpi_device *adev; |
| 65 | }; |
| 66 | |
| 67 | #define DOCK_DOCKING 0x00000001 |
| 68 | #define DOCK_UNDOCKING 0x00000002 |
| 69 | #define DOCK_IS_DOCK 0x00000010 |
| 70 | #define DOCK_IS_ATA 0x00000020 |
| 71 | #define DOCK_IS_BAT 0x00000040 |
| 72 | #define DOCK_EVENT 3 |
| 73 | #define UNDOCK_EVENT 2 |
| 74 | |
| 75 | enum dock_callback_type { |
| 76 | DOCK_CALL_HANDLER, |
| 77 | DOCK_CALL_FIXUP, |
| 78 | DOCK_CALL_UEVENT, |
| 79 | }; |
| 80 | |
| 81 | /***************************************************************************** |
| 82 | * Dock Dependent device functions * |
| 83 | *****************************************************************************/ |
| 84 | /** |
| 85 | * add_dock_dependent_device - associate a device with the dock station |
| 86 | * @ds: Dock station. |
| 87 | * @adev: Dependent ACPI device object. |
| 88 | * |
| 89 | * Add the dependent device to the dock's dependent device list. |
| 90 | */ |
| 91 | static int add_dock_dependent_device(struct dock_station *ds, |
| 92 | struct acpi_device *adev) |
| 93 | { |
| 94 | struct dock_dependent_device *dd; |
| 95 | |
| 96 | dd = kzalloc(sizeof(*dd), GFP_KERNEL); |
| 97 | if (!dd) |
| 98 | return -ENOMEM; |
| 99 | |
| 100 | dd->adev = adev; |
| 101 | INIT_LIST_HEAD(&dd->list); |
| 102 | list_add_tail(&dd->list, &ds->dependent_devices); |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event, |
| 108 | enum dock_callback_type cb_type) |
| 109 | { |
| 110 | struct acpi_device *adev = dd->adev; |
| 111 | |
| 112 | acpi_lock_hp_context(); |
| 113 | |
| 114 | if (!adev->hp) |
| 115 | goto out; |
| 116 | |
| 117 | if (cb_type == DOCK_CALL_FIXUP) { |
| 118 | void (*fixup)(struct acpi_device *); |
| 119 | |
| 120 | fixup = adev->hp->fixup; |
| 121 | if (fixup) { |
| 122 | acpi_unlock_hp_context(); |
| 123 | fixup(adev); |
| 124 | return; |
| 125 | } |
| 126 | } else if (cb_type == DOCK_CALL_UEVENT) { |
| 127 | void (*uevent)(struct acpi_device *, u32); |
| 128 | |
| 129 | uevent = adev->hp->uevent; |
| 130 | if (uevent) { |
| 131 | acpi_unlock_hp_context(); |
| 132 | uevent(adev, event); |
| 133 | return; |
| 134 | } |
| 135 | } else { |
| 136 | int (*notify)(struct acpi_device *, u32); |
| 137 | |
| 138 | notify = adev->hp->notify; |
| 139 | if (notify) { |
| 140 | acpi_unlock_hp_context(); |
| 141 | notify(adev, event); |
| 142 | return; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | out: |
| 147 | acpi_unlock_hp_context(); |
| 148 | } |
| 149 | |
| 150 | static struct dock_station *find_dock_station(acpi_handle handle) |
| 151 | { |
| 152 | struct dock_station *ds; |
| 153 | |
| 154 | list_for_each_entry(ds, &dock_stations, sibling) |
| 155 | if (ds->handle == handle) |
| 156 | return ds; |
| 157 | |
| 158 | return NULL; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * find_dock_dependent_device - get a device dependent on this dock |
| 163 | * @ds: the dock station |
| 164 | * @adev: ACPI device object to find. |
| 165 | * |
| 166 | * iterate over the dependent device list for this dock. If the |
| 167 | * dependent device matches the handle, return. |
| 168 | */ |
| 169 | static struct dock_dependent_device * |
| 170 | find_dock_dependent_device(struct dock_station *ds, struct acpi_device *adev) |
| 171 | { |
| 172 | struct dock_dependent_device *dd; |
| 173 | |
| 174 | list_for_each_entry(dd, &ds->dependent_devices, list) |
| 175 | if (adev == dd->adev) |
| 176 | return dd; |
| 177 | |
| 178 | return NULL; |
| 179 | } |
| 180 | |
| 181 | void register_dock_dependent_device(struct acpi_device *adev, |
| 182 | acpi_handle dshandle) |
| 183 | { |
| 184 | struct dock_station *ds = find_dock_station(dshandle); |
| 185 | |
| 186 | if (ds && !find_dock_dependent_device(ds, adev)) |
| 187 | add_dock_dependent_device(ds, adev); |
| 188 | } |
| 189 | |
| 190 | /***************************************************************************** |
| 191 | * Dock functions * |
| 192 | *****************************************************************************/ |
| 193 | |
| 194 | /** |
| 195 | * is_dock_device - see if a device is on a dock station |
| 196 | * @adev: ACPI device object to check. |
| 197 | * |
| 198 | * If this device is either the dock station itself, |
| 199 | * or is a device dependent on the dock station, then it |
| 200 | * is a dock device |
| 201 | */ |
| 202 | int is_dock_device(struct acpi_device *adev) |
| 203 | { |
| 204 | struct dock_station *dock_station; |
| 205 | |
| 206 | if (!dock_station_count) |
| 207 | return 0; |
| 208 | |
| 209 | if (acpi_dock_match(adev->handle)) |
| 210 | return 1; |
| 211 | |
| 212 | list_for_each_entry(dock_station, &dock_stations, sibling) |
| 213 | if (find_dock_dependent_device(dock_station, adev)) |
| 214 | return 1; |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | EXPORT_SYMBOL_GPL(is_dock_device); |
| 219 | |
| 220 | /** |
| 221 | * dock_present - see if the dock station is present. |
| 222 | * @ds: the dock station |
| 223 | * |
| 224 | * execute the _STA method. note that present does not |
| 225 | * imply that we are docked. |
| 226 | */ |
| 227 | static int dock_present(struct dock_station *ds) |
| 228 | { |
| 229 | unsigned long long sta; |
| 230 | acpi_status status; |
| 231 | |
| 232 | if (ds) { |
| 233 | status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); |
| 234 | if (ACPI_SUCCESS(status) && sta) |
| 235 | return 1; |
| 236 | } |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * hot_remove_dock_devices - Remove dock station devices. |
| 242 | * @ds: Dock station. |
| 243 | */ |
| 244 | static void hot_remove_dock_devices(struct dock_station *ds) |
| 245 | { |
| 246 | struct dock_dependent_device *dd; |
| 247 | |
| 248 | /* |
| 249 | * Walk the list in reverse order so that devices that have been added |
| 250 | * last are removed first (in case there are some indirect dependencies |
| 251 | * between them). |
| 252 | */ |
| 253 | list_for_each_entry_reverse(dd, &ds->dependent_devices, list) |
| 254 | dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, false); |
| 255 | |
| 256 | list_for_each_entry_reverse(dd, &ds->dependent_devices, list) |
| 257 | acpi_bus_trim(dd->adev); |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * hotplug_dock_devices - Insert devices on a dock station. |
| 262 | * @ds: the dock station |
| 263 | * @event: either bus check or device check request |
| 264 | * |
| 265 | * Some devices on the dock station need to have drivers called |
| 266 | * to perform hotplug operations after a dock event has occurred. |
| 267 | * Traverse the list of dock devices that have registered a |
| 268 | * hotplug handler, and call the handler. |
| 269 | */ |
| 270 | static void hotplug_dock_devices(struct dock_station *ds, u32 event) |
| 271 | { |
| 272 | struct dock_dependent_device *dd; |
| 273 | |
| 274 | /* Call driver specific post-dock fixups. */ |
| 275 | list_for_each_entry(dd, &ds->dependent_devices, list) |
| 276 | dock_hotplug_event(dd, event, DOCK_CALL_FIXUP); |
| 277 | |
| 278 | /* Call driver specific hotplug functions. */ |
| 279 | list_for_each_entry(dd, &ds->dependent_devices, list) |
| 280 | dock_hotplug_event(dd, event, DOCK_CALL_HANDLER); |
| 281 | |
| 282 | /* |
| 283 | * Check if all devices have been enumerated already. If not, run |
| 284 | * acpi_bus_scan() for them and that will cause scan handlers to be |
| 285 | * attached to device objects or acpi_drivers to be stopped/started if |
| 286 | * they are present. |
| 287 | */ |
| 288 | list_for_each_entry(dd, &ds->dependent_devices, list) { |
| 289 | struct acpi_device *adev = dd->adev; |
| 290 | |
| 291 | if (!acpi_device_enumerated(adev)) { |
| 292 | int ret = acpi_bus_scan(adev->handle); |
| 293 | if (ret) |
| 294 | dev_dbg(&adev->dev, "scan error %d\n", -ret); |
| 295 | } |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | static void dock_event(struct dock_station *ds, u32 event, int num) |
| 300 | { |
| 301 | struct device *dev = &ds->dock_device->dev; |
| 302 | char event_string[13]; |
| 303 | char *envp[] = { event_string, NULL }; |
| 304 | struct dock_dependent_device *dd; |
| 305 | |
| 306 | if (num == UNDOCK_EVENT) |
| 307 | sprintf(event_string, "EVENT=undock"); |
| 308 | else |
| 309 | sprintf(event_string, "EVENT=dock"); |
| 310 | |
| 311 | /* |
| 312 | * Indicate that the status of the dock station has |
| 313 | * changed. |
| 314 | */ |
| 315 | if (num == DOCK_EVENT) |
| 316 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
| 317 | |
| 318 | list_for_each_entry(dd, &ds->dependent_devices, list) |
| 319 | dock_hotplug_event(dd, event, DOCK_CALL_UEVENT); |
| 320 | |
| 321 | if (num != DOCK_EVENT) |
| 322 | kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * handle_dock - handle a dock event |
| 327 | * @ds: the dock station |
| 328 | * @dock: to dock, or undock - that is the question |
| 329 | * |
| 330 | * Execute the _DCK method in response to an acpi event |
| 331 | */ |
| 332 | static void handle_dock(struct dock_station *ds, int dock) |
| 333 | { |
| 334 | acpi_status status; |
| 335 | struct acpi_object_list arg_list; |
| 336 | union acpi_object arg; |
| 337 | unsigned long long value; |
| 338 | |
| 339 | acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking"); |
| 340 | |
| 341 | /* _DCK method has one argument */ |
| 342 | arg_list.count = 1; |
| 343 | arg_list.pointer = &arg; |
| 344 | arg.type = ACPI_TYPE_INTEGER; |
| 345 | arg.integer.value = dock; |
| 346 | status = acpi_evaluate_integer(ds->handle, "_DCK", &arg_list, &value); |
| 347 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) |
| 348 | acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n", |
| 349 | status); |
| 350 | } |
| 351 | |
| 352 | static inline void dock(struct dock_station *ds) |
| 353 | { |
| 354 | handle_dock(ds, 1); |
| 355 | } |
| 356 | |
| 357 | static inline void undock(struct dock_station *ds) |
| 358 | { |
| 359 | handle_dock(ds, 0); |
| 360 | } |
| 361 | |
| 362 | static inline void begin_dock(struct dock_station *ds) |
| 363 | { |
| 364 | ds->flags |= DOCK_DOCKING; |
| 365 | } |
| 366 | |
| 367 | static inline void complete_dock(struct dock_station *ds) |
| 368 | { |
| 369 | ds->flags &= ~(DOCK_DOCKING); |
| 370 | ds->last_dock_time = jiffies; |
| 371 | } |
| 372 | |
| 373 | static inline void begin_undock(struct dock_station *ds) |
| 374 | { |
| 375 | ds->flags |= DOCK_UNDOCKING; |
| 376 | } |
| 377 | |
| 378 | static inline void complete_undock(struct dock_station *ds) |
| 379 | { |
| 380 | ds->flags &= ~(DOCK_UNDOCKING); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * dock_in_progress - see if we are in the middle of handling a dock event |
| 385 | * @ds: the dock station |
| 386 | * |
| 387 | * Sometimes while docking, false dock events can be sent to the driver |
| 388 | * because good connections aren't made or some other reason. Ignore these |
| 389 | * if we are in the middle of doing something. |
| 390 | */ |
| 391 | static int dock_in_progress(struct dock_station *ds) |
| 392 | { |
| 393 | if ((ds->flags & DOCK_DOCKING) || |
| 394 | time_before(jiffies, (ds->last_dock_time + HZ))) |
| 395 | return 1; |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * handle_eject_request - handle an undock request checking for error conditions |
| 401 | * |
| 402 | * Check to make sure the dock device is still present, then undock and |
| 403 | * hotremove all the devices that may need removing. |
| 404 | */ |
| 405 | static int handle_eject_request(struct dock_station *ds, u32 event) |
| 406 | { |
| 407 | if (dock_in_progress(ds)) |
| 408 | return -EBUSY; |
| 409 | |
| 410 | /* |
| 411 | * here we need to generate the undock |
| 412 | * event prior to actually doing the undock |
| 413 | * so that the device struct still exists. |
| 414 | * Also, even send the dock event if the |
| 415 | * device is not present anymore |
| 416 | */ |
| 417 | dock_event(ds, event, UNDOCK_EVENT); |
| 418 | |
| 419 | hot_remove_dock_devices(ds); |
| 420 | undock(ds); |
| 421 | acpi_evaluate_lck(ds->handle, 0); |
| 422 | acpi_evaluate_ej0(ds->handle); |
| 423 | if (dock_present(ds)) { |
| 424 | acpi_handle_err(ds->handle, "Unable to undock!\n"); |
| 425 | return -EBUSY; |
| 426 | } |
| 427 | complete_undock(ds); |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /** |
| 432 | * dock_notify - Handle ACPI dock notification. |
| 433 | * @adev: Dock station's ACPI device object. |
| 434 | * @event: Event code. |
| 435 | * |
| 436 | * If we are notified to dock, then check to see if the dock is |
| 437 | * present and then dock. Notify all drivers of the dock event, |
| 438 | * and then hotplug and devices that may need hotplugging. |
| 439 | */ |
| 440 | int dock_notify(struct acpi_device *adev, u32 event) |
| 441 | { |
| 442 | acpi_handle handle = adev->handle; |
| 443 | struct dock_station *ds = find_dock_station(handle); |
| 444 | int surprise_removal = 0; |
| 445 | |
| 446 | if (!ds) |
| 447 | return -ENODEV; |
| 448 | |
| 449 | /* |
| 450 | * According to acpi spec 3.0a, if a DEVICE_CHECK notification |
| 451 | * is sent and _DCK is present, it is assumed to mean an undock |
| 452 | * request. |
| 453 | */ |
| 454 | if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) |
| 455 | event = ACPI_NOTIFY_EJECT_REQUEST; |
| 456 | |
| 457 | /* |
| 458 | * dock station: BUS_CHECK - docked or surprise removal |
| 459 | * DEVICE_CHECK - undocked |
| 460 | * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal |
| 461 | * |
| 462 | * To simplify event handling, dock dependent device handler always |
| 463 | * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and |
| 464 | * ACPI_NOTIFY_EJECT_REQUEST for removal |
| 465 | */ |
| 466 | switch (event) { |
| 467 | case ACPI_NOTIFY_BUS_CHECK: |
| 468 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 469 | if (!dock_in_progress(ds) && !acpi_device_enumerated(adev)) { |
| 470 | begin_dock(ds); |
| 471 | dock(ds); |
| 472 | if (!dock_present(ds)) { |
| 473 | acpi_handle_err(handle, "Unable to dock!\n"); |
| 474 | complete_dock(ds); |
| 475 | break; |
| 476 | } |
| 477 | hotplug_dock_devices(ds, event); |
| 478 | complete_dock(ds); |
| 479 | dock_event(ds, event, DOCK_EVENT); |
| 480 | acpi_evaluate_lck(ds->handle, 1); |
| 481 | acpi_update_all_gpes(); |
| 482 | break; |
| 483 | } |
| 484 | if (dock_present(ds) || dock_in_progress(ds)) |
| 485 | break; |
| 486 | /* This is a surprise removal */ |
| 487 | surprise_removal = 1; |
| 488 | event = ACPI_NOTIFY_EJECT_REQUEST; |
| 489 | /* Fall back */ |
| 490 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 491 | begin_undock(ds); |
| 492 | if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) |
| 493 | || surprise_removal) |
| 494 | handle_eject_request(ds, event); |
| 495 | else |
| 496 | dock_event(ds, event, UNDOCK_EVENT); |
| 497 | break; |
| 498 | } |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * show_docked - read method for "docked" file in sysfs |
| 504 | */ |
| 505 | static ssize_t show_docked(struct device *dev, |
| 506 | struct device_attribute *attr, char *buf) |
| 507 | { |
| 508 | struct dock_station *dock_station = dev->platform_data; |
| 509 | struct acpi_device *adev = NULL; |
| 510 | |
| 511 | acpi_bus_get_device(dock_station->handle, &adev); |
| 512 | return snprintf(buf, PAGE_SIZE, "%u\n", acpi_device_enumerated(adev)); |
| 513 | } |
| 514 | static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); |
| 515 | |
| 516 | /* |
| 517 | * show_flags - read method for flags file in sysfs |
| 518 | */ |
| 519 | static ssize_t show_flags(struct device *dev, |
| 520 | struct device_attribute *attr, char *buf) |
| 521 | { |
| 522 | struct dock_station *dock_station = dev->platform_data; |
| 523 | return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); |
| 524 | |
| 525 | } |
| 526 | static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); |
| 527 | |
| 528 | /* |
| 529 | * write_undock - write method for "undock" file in sysfs |
| 530 | */ |
| 531 | static ssize_t write_undock(struct device *dev, struct device_attribute *attr, |
| 532 | const char *buf, size_t count) |
| 533 | { |
| 534 | int ret; |
| 535 | struct dock_station *dock_station = dev->platform_data; |
| 536 | |
| 537 | if (!count) |
| 538 | return -EINVAL; |
| 539 | |
| 540 | acpi_scan_lock_acquire(); |
| 541 | begin_undock(dock_station); |
| 542 | ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); |
| 543 | acpi_scan_lock_release(); |
| 544 | return ret ? ret: count; |
| 545 | } |
| 546 | static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); |
| 547 | |
| 548 | /* |
| 549 | * show_dock_uid - read method for "uid" file in sysfs |
| 550 | */ |
| 551 | static ssize_t show_dock_uid(struct device *dev, |
| 552 | struct device_attribute *attr, char *buf) |
| 553 | { |
| 554 | unsigned long long lbuf; |
| 555 | struct dock_station *dock_station = dev->platform_data; |
| 556 | acpi_status status = acpi_evaluate_integer(dock_station->handle, |
| 557 | "_UID", NULL, &lbuf); |
| 558 | if (ACPI_FAILURE(status)) |
| 559 | return 0; |
| 560 | |
| 561 | return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); |
| 562 | } |
| 563 | static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); |
| 564 | |
| 565 | static ssize_t show_dock_type(struct device *dev, |
| 566 | struct device_attribute *attr, char *buf) |
| 567 | { |
| 568 | struct dock_station *dock_station = dev->platform_data; |
| 569 | char *type; |
| 570 | |
| 571 | if (dock_station->flags & DOCK_IS_DOCK) |
| 572 | type = "dock_station"; |
| 573 | else if (dock_station->flags & DOCK_IS_ATA) |
| 574 | type = "ata_bay"; |
| 575 | else if (dock_station->flags & DOCK_IS_BAT) |
| 576 | type = "battery_bay"; |
| 577 | else |
| 578 | type = "unknown"; |
| 579 | |
| 580 | return snprintf(buf, PAGE_SIZE, "%s\n", type); |
| 581 | } |
| 582 | static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); |
| 583 | |
| 584 | static struct attribute *dock_attributes[] = { |
| 585 | &dev_attr_docked.attr, |
| 586 | &dev_attr_flags.attr, |
| 587 | &dev_attr_undock.attr, |
| 588 | &dev_attr_uid.attr, |
| 589 | &dev_attr_type.attr, |
| 590 | NULL |
| 591 | }; |
| 592 | |
| 593 | static struct attribute_group dock_attribute_group = { |
| 594 | .attrs = dock_attributes |
| 595 | }; |
| 596 | |
| 597 | /** |
| 598 | * acpi_dock_add - Add a new dock station |
| 599 | * @adev: Dock station ACPI device object. |
| 600 | * |
| 601 | * allocated and initialize a new dock station device. |
| 602 | */ |
| 603 | void acpi_dock_add(struct acpi_device *adev) |
| 604 | { |
| 605 | struct dock_station *dock_station, ds = { NULL, }; |
| 606 | struct platform_device_info pdevinfo; |
| 607 | acpi_handle handle = adev->handle; |
| 608 | struct platform_device *dd; |
| 609 | int ret; |
| 610 | |
| 611 | memset(&pdevinfo, 0, sizeof(pdevinfo)); |
| 612 | pdevinfo.name = "dock"; |
| 613 | pdevinfo.id = dock_station_count; |
| 614 | pdevinfo.fwnode = acpi_fwnode_handle(adev); |
| 615 | pdevinfo.data = &ds; |
| 616 | pdevinfo.size_data = sizeof(ds); |
| 617 | dd = platform_device_register_full(&pdevinfo); |
| 618 | if (IS_ERR(dd)) |
| 619 | return; |
| 620 | |
| 621 | dock_station = dd->dev.platform_data; |
| 622 | |
| 623 | dock_station->handle = handle; |
| 624 | dock_station->dock_device = dd; |
| 625 | dock_station->last_dock_time = jiffies - HZ; |
| 626 | |
| 627 | INIT_LIST_HEAD(&dock_station->sibling); |
| 628 | INIT_LIST_HEAD(&dock_station->dependent_devices); |
| 629 | |
| 630 | /* we want the dock device to send uevents */ |
| 631 | dev_set_uevent_suppress(&dd->dev, 0); |
| 632 | |
| 633 | if (acpi_dock_match(handle)) |
| 634 | dock_station->flags |= DOCK_IS_DOCK; |
| 635 | if (acpi_ata_match(handle)) |
| 636 | dock_station->flags |= DOCK_IS_ATA; |
| 637 | if (acpi_device_is_battery(adev)) |
| 638 | dock_station->flags |= DOCK_IS_BAT; |
| 639 | |
| 640 | ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); |
| 641 | if (ret) |
| 642 | goto err_unregister; |
| 643 | |
| 644 | /* add the dock station as a device dependent on itself */ |
| 645 | ret = add_dock_dependent_device(dock_station, adev); |
| 646 | if (ret) |
| 647 | goto err_rmgroup; |
| 648 | |
| 649 | dock_station_count++; |
| 650 | list_add(&dock_station->sibling, &dock_stations); |
| 651 | adev->flags.is_dock_station = true; |
| 652 | dev_info(&adev->dev, "ACPI dock station (docks/bays count: %d)\n", |
| 653 | dock_station_count); |
| 654 | return; |
| 655 | |
| 656 | err_rmgroup: |
| 657 | sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); |
| 658 | |
| 659 | err_unregister: |
| 660 | platform_device_unregister(dd); |
| 661 | acpi_handle_err(handle, "%s encountered error %d\n", __func__, ret); |
| 662 | } |