/drivers/platform/x86/dell-wmi.c

http://github.com/mirrors/linux · C · 732 lines · 438 code · 133 blank · 161 comment · 58 complexity · ee798f90bc80cff7f9c23656f582b450 MD5 · raw file

  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Dell WMI hotkeys
  4. *
  5. * Copyright (C) 2008 Red Hat <mjg@redhat.com>
  6. * Copyright (C) 2014-2015 Pali Rohár <pali@kernel.org>
  7. *
  8. * Portions based on wistron_btns.c:
  9. * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
  10. * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
  11. * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
  12. */
  13. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14. #include <linux/kernel.h>
  15. #include <linux/module.h>
  16. #include <linux/init.h>
  17. #include <linux/slab.h>
  18. #include <linux/types.h>
  19. #include <linux/input.h>
  20. #include <linux/input/sparse-keymap.h>
  21. #include <linux/acpi.h>
  22. #include <linux/string.h>
  23. #include <linux/dmi.h>
  24. #include <linux/wmi.h>
  25. #include <acpi/video.h>
  26. #include "dell-smbios.h"
  27. #include "dell-wmi-descriptor.h"
  28. MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
  29. MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
  30. MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
  31. MODULE_LICENSE("GPL");
  32. #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
  33. static bool wmi_requires_smbios_request;
  34. struct dell_wmi_priv {
  35. struct input_dev *input_dev;
  36. u32 interface_version;
  37. };
  38. static int __init dmi_matched(const struct dmi_system_id *dmi)
  39. {
  40. wmi_requires_smbios_request = 1;
  41. return 1;
  42. }
  43. static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = {
  44. {
  45. .callback = dmi_matched,
  46. .ident = "Dell Inspiron M5110",
  47. .matches = {
  48. DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  49. DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
  50. },
  51. },
  52. {
  53. .callback = dmi_matched,
  54. .ident = "Dell Vostro V131",
  55. .matches = {
  56. DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  57. DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
  58. },
  59. },
  60. { }
  61. };
  62. /*
  63. * Keymap for WMI events of type 0x0000
  64. *
  65. * Certain keys are flagged as KE_IGNORE. All of these are either
  66. * notifications (rather than requests for change) or are also sent
  67. * via the keyboard controller so should not be sent again.
  68. */
  69. static const struct key_entry dell_wmi_keymap_type_0000[] = {
  70. { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
  71. /* Key code is followed by brightness level */
  72. { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
  73. { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
  74. /* Battery health status button */
  75. { KE_KEY, 0xe007, { KEY_BATTERY } },
  76. /* Radio devices state change, key code is followed by other values */
  77. { KE_IGNORE, 0xe008, { KEY_RFKILL } },
  78. { KE_KEY, 0xe009, { KEY_EJECTCD } },
  79. /* Key code is followed by: next, active and attached devices */
  80. { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },
  81. /* Key code is followed by keyboard illumination level */
  82. { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },
  83. /* BIOS error detected */
  84. { KE_IGNORE, 0xe00d, { KEY_RESERVED } },
  85. /* Battery was removed or inserted */
  86. { KE_IGNORE, 0xe00e, { KEY_RESERVED } },
  87. /* Wifi Catcher */
  88. { KE_KEY, 0xe011, { KEY_WLAN } },
  89. /* Ambient light sensor toggle */
  90. { KE_IGNORE, 0xe013, { KEY_RESERVED } },
  91. { KE_IGNORE, 0xe020, { KEY_MUTE } },
  92. /* Unknown, defined in ACPI DSDT */
  93. /* { KE_IGNORE, 0xe023, { KEY_RESERVED } }, */
  94. /* Untested, Dell Instant Launch key on Inspiron 7520 */
  95. /* { KE_IGNORE, 0xe024, { KEY_RESERVED } }, */
  96. /* Dell Instant Launch key */
  97. { KE_KEY, 0xe025, { KEY_PROG4 } },
  98. /* Audio panel key */
  99. { KE_IGNORE, 0xe026, { KEY_RESERVED } },
  100. /* LCD Display On/Off Control key */
  101. { KE_KEY, 0xe027, { KEY_DISPLAYTOGGLE } },
  102. /* Untested, Multimedia key on Dell Vostro 3560 */
  103. /* { KE_IGNORE, 0xe028, { KEY_RESERVED } }, */
  104. /* Dell Instant Launch key */
  105. { KE_KEY, 0xe029, { KEY_PROG4 } },
  106. /* Untested, Windows Mobility Center button on Inspiron 7520 */
  107. /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
  108. /* Unknown, defined in ACPI DSDT */
  109. /* { KE_IGNORE, 0xe02b, { KEY_RESERVED } }, */
  110. /* Untested, Dell Audio With Preset Switch button on Inspiron 7520 */
  111. /* { KE_IGNORE, 0xe02c, { KEY_RESERVED } }, */
  112. { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
  113. { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
  114. { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
  115. { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
  116. { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
  117. /* NIC Link is Up */
  118. { KE_IGNORE, 0xe043, { KEY_RESERVED } },
  119. /* NIC Link is Down */
  120. { KE_IGNORE, 0xe044, { KEY_RESERVED } },
  121. /*
  122. * This entry is very suspicious!
  123. * Originally Matthew Garrett created this dell-wmi driver specially for
  124. * "button with a picture of a battery" which has event code 0xe045.
  125. * Later Mario Limonciello from Dell told us that event code 0xe045 is
  126. * reported by Num Lock and should be ignored because key is send also
  127. * by keyboard controller.
  128. * So for now we will ignore this event to prevent potential double
  129. * Num Lock key press.
  130. */
  131. { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
  132. /* Scroll lock and also going to tablet mode on portable devices */
  133. { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
  134. /* Untested, going from tablet mode on portable devices */
  135. /* { KE_IGNORE, 0xe047, { KEY_RESERVED } }, */
  136. /* Dell Support Center key */
  137. { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
  138. { KE_IGNORE, 0xe0f7, { KEY_MUTE } },
  139. { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
  140. { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
  141. };
  142. struct dell_bios_keymap_entry {
  143. u16 scancode;
  144. u16 keycode;
  145. };
  146. struct dell_bios_hotkey_table {
  147. struct dmi_header header;
  148. struct dell_bios_keymap_entry keymap[];
  149. };
  150. struct dell_dmi_results {
  151. int err;
  152. int keymap_size;
  153. struct key_entry *keymap;
  154. };
  155. /* Uninitialized entries here are KEY_RESERVED == 0. */
  156. static const u16 bios_to_linux_keycode[256] = {
  157. [0] = KEY_MEDIA,
  158. [1] = KEY_NEXTSONG,
  159. [2] = KEY_PLAYPAUSE,
  160. [3] = KEY_PREVIOUSSONG,
  161. [4] = KEY_STOPCD,
  162. [5] = KEY_UNKNOWN,
  163. [6] = KEY_UNKNOWN,
  164. [7] = KEY_UNKNOWN,
  165. [8] = KEY_WWW,
  166. [9] = KEY_UNKNOWN,
  167. [10] = KEY_VOLUMEDOWN,
  168. [11] = KEY_MUTE,
  169. [12] = KEY_VOLUMEUP,
  170. [13] = KEY_UNKNOWN,
  171. [14] = KEY_BATTERY,
  172. [15] = KEY_EJECTCD,
  173. [16] = KEY_UNKNOWN,
  174. [17] = KEY_SLEEP,
  175. [18] = KEY_PROG1,
  176. [19] = KEY_BRIGHTNESSDOWN,
  177. [20] = KEY_BRIGHTNESSUP,
  178. [21] = KEY_BRIGHTNESS_AUTO,
  179. [22] = KEY_KBDILLUMTOGGLE,
  180. [23] = KEY_UNKNOWN,
  181. [24] = KEY_SWITCHVIDEOMODE,
  182. [25] = KEY_UNKNOWN,
  183. [26] = KEY_UNKNOWN,
  184. [27] = KEY_SWITCHVIDEOMODE,
  185. [28] = KEY_UNKNOWN,
  186. [29] = KEY_UNKNOWN,
  187. [30] = KEY_PROG2,
  188. [31] = KEY_UNKNOWN,
  189. [32] = KEY_UNKNOWN,
  190. [33] = KEY_UNKNOWN,
  191. [34] = KEY_UNKNOWN,
  192. [35] = KEY_UNKNOWN,
  193. [36] = KEY_UNKNOWN,
  194. [37] = KEY_UNKNOWN,
  195. [38] = KEY_MICMUTE,
  196. [255] = KEY_PROG3,
  197. };
  198. /*
  199. * Keymap for WMI events of type 0x0010
  200. *
  201. * These are applied if the 0xB2 DMI hotkey table is present and doesn't
  202. * override them.
  203. */
  204. static const struct key_entry dell_wmi_keymap_type_0010[] = {
  205. /* Fn-lock switched to function keys */
  206. { KE_IGNORE, 0x0, { KEY_RESERVED } },
  207. /* Fn-lock switched to multimedia keys */
  208. { KE_IGNORE, 0x1, { KEY_RESERVED } },
  209. /* Keyboard backlight change notification */
  210. { KE_IGNORE, 0x3f, { KEY_RESERVED } },
  211. /* Mic mute */
  212. { KE_KEY, 0x150, { KEY_MICMUTE } },
  213. /* Fn-lock */
  214. { KE_IGNORE, 0x151, { KEY_RESERVED } },
  215. /* Change keyboard illumination */
  216. { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } },
  217. /*
  218. * Radio disable (notify only -- there is no model for which the
  219. * WMI event is supposed to trigger an action).
  220. */
  221. { KE_IGNORE, 0x153, { KEY_RFKILL } },
  222. /* RGB keyboard backlight control */
  223. { KE_IGNORE, 0x154, { KEY_RESERVED } },
  224. /*
  225. * Stealth mode toggle. This will "disable all lights and sounds".
  226. * The action is performed by the BIOS and EC; the WMI event is just
  227. * a notification. On the XPS 13 9350, this is Fn+F7, and there's
  228. * a BIOS setting to enable and disable the hotkey.
  229. */
  230. { KE_IGNORE, 0x155, { KEY_RESERVED } },
  231. /* Rugged magnetic dock attach/detach events */
  232. { KE_IGNORE, 0x156, { KEY_RESERVED } },
  233. { KE_IGNORE, 0x157, { KEY_RESERVED } },
  234. /* Rugged programmable (P1/P2/P3 keys) */
  235. { KE_KEY, 0x850, { KEY_PROG1 } },
  236. { KE_KEY, 0x851, { KEY_PROG2 } },
  237. { KE_KEY, 0x852, { KEY_PROG3 } },
  238. /*
  239. * Radio disable (notify only -- there is no model for which the
  240. * WMI event is supposed to trigger an action).
  241. */
  242. { KE_IGNORE, 0xe008, { KEY_RFKILL } },
  243. /* Fn-lock */
  244. { KE_IGNORE, 0xe035, { KEY_RESERVED } },
  245. };
  246. /*
  247. * Keymap for WMI events of type 0x0011
  248. */
  249. static const struct key_entry dell_wmi_keymap_type_0011[] = {
  250. /* Battery unplugged */
  251. { KE_IGNORE, 0xfff0, { KEY_RESERVED } },
  252. /* Battery inserted */
  253. { KE_IGNORE, 0xfff1, { KEY_RESERVED } },
  254. /* Keyboard backlight level changed */
  255. { KE_IGNORE, KBD_LED_OFF_TOKEN, { KEY_RESERVED } },
  256. { KE_IGNORE, KBD_LED_ON_TOKEN, { KEY_RESERVED } },
  257. { KE_IGNORE, KBD_LED_AUTO_TOKEN, { KEY_RESERVED } },
  258. { KE_IGNORE, KBD_LED_AUTO_25_TOKEN, { KEY_RESERVED } },
  259. { KE_IGNORE, KBD_LED_AUTO_50_TOKEN, { KEY_RESERVED } },
  260. { KE_IGNORE, KBD_LED_AUTO_75_TOKEN, { KEY_RESERVED } },
  261. { KE_IGNORE, KBD_LED_AUTO_100_TOKEN, { KEY_RESERVED } },
  262. };
  263. static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
  264. {
  265. struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
  266. const struct key_entry *key;
  267. key = sparse_keymap_entry_from_scancode(priv->input_dev,
  268. (type << 16) | code);
  269. if (!key) {
  270. pr_info("Unknown key with type 0x%04x and code 0x%04x pressed\n",
  271. type, code);
  272. return;
  273. }
  274. pr_debug("Key with type 0x%04x and code 0x%04x pressed\n", type, code);
  275. /* Don't report brightness notifications that will also come via ACPI */
  276. if ((key->keycode == KEY_BRIGHTNESSUP ||
  277. key->keycode == KEY_BRIGHTNESSDOWN) &&
  278. acpi_video_handles_brightness_key_presses())
  279. return;
  280. if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
  281. return;
  282. if (key->keycode == KEY_KBDILLUMTOGGLE)
  283. dell_laptop_call_notifier(
  284. DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED, NULL);
  285. sparse_keymap_report_entry(priv->input_dev, key, 1, true);
  286. }
  287. static void dell_wmi_notify(struct wmi_device *wdev,
  288. union acpi_object *obj)
  289. {
  290. struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
  291. u16 *buffer_entry, *buffer_end;
  292. acpi_size buffer_size;
  293. int len, i;
  294. if (obj->type != ACPI_TYPE_BUFFER) {
  295. pr_warn("bad response type %x\n", obj->type);
  296. return;
  297. }
  298. pr_debug("Received WMI event (%*ph)\n",
  299. obj->buffer.length, obj->buffer.pointer);
  300. buffer_entry = (u16 *)obj->buffer.pointer;
  301. buffer_size = obj->buffer.length/2;
  302. buffer_end = buffer_entry + buffer_size;
  303. /*
  304. * BIOS/ACPI on devices with WMI interface version 0 does not clear
  305. * buffer before filling it. So next time when BIOS/ACPI send WMI event
  306. * which is smaller as previous then it contains garbage in buffer from
  307. * previous event.
  308. *
  309. * BIOS/ACPI on devices with WMI interface version 1 clears buffer and
  310. * sometimes send more events in buffer at one call.
  311. *
  312. * So to prevent reading garbage from buffer we will process only first
  313. * one event on devices with WMI interface version 0.
  314. */
  315. if (priv->interface_version == 0 && buffer_entry < buffer_end)
  316. if (buffer_end > buffer_entry + buffer_entry[0] + 1)
  317. buffer_end = buffer_entry + buffer_entry[0] + 1;
  318. while (buffer_entry < buffer_end) {
  319. len = buffer_entry[0];
  320. if (len == 0)
  321. break;
  322. len++;
  323. if (buffer_entry + len > buffer_end) {
  324. pr_warn("Invalid length of WMI event\n");
  325. break;
  326. }
  327. pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry);
  328. switch (buffer_entry[1]) {
  329. case 0x0000: /* One key pressed or event occurred */
  330. if (len > 2)
  331. dell_wmi_process_key(wdev, 0x0000,
  332. buffer_entry[2]);
  333. /* Other entries could contain additional information */
  334. break;
  335. case 0x0010: /* Sequence of keys pressed */
  336. case 0x0011: /* Sequence of events occurred */
  337. for (i = 2; i < len; ++i)
  338. dell_wmi_process_key(wdev, buffer_entry[1],
  339. buffer_entry[i]);
  340. break;
  341. default: /* Unknown event */
  342. pr_info("Unknown WMI event type 0x%x\n",
  343. (int)buffer_entry[1]);
  344. break;
  345. }
  346. buffer_entry += len;
  347. }
  348. }
  349. static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len)
  350. {
  351. int i;
  352. for (i = 0; i < len; i++)
  353. if (keymap[i].code == scancode)
  354. return true;
  355. return false;
  356. }
  357. static void handle_dmi_entry(const struct dmi_header *dm, void *opaque)
  358. {
  359. struct dell_dmi_results *results = opaque;
  360. struct dell_bios_hotkey_table *table;
  361. int hotkey_num, i, pos = 0;
  362. struct key_entry *keymap;
  363. if (results->err || results->keymap)
  364. return; /* We already found the hotkey table. */
  365. /* The Dell hotkey table is type 0xB2. Scan until we find it. */
  366. if (dm->type != 0xb2)
  367. return;
  368. table = container_of(dm, struct dell_bios_hotkey_table, header);
  369. hotkey_num = (table->header.length -
  370. sizeof(struct dell_bios_hotkey_table)) /
  371. sizeof(struct dell_bios_keymap_entry);
  372. if (hotkey_num < 1) {
  373. /*
  374. * Historically, dell-wmi would ignore a DMI entry of
  375. * fewer than 7 bytes. Sizes between 4 and 8 bytes are
  376. * nonsensical (both the header and all entries are 4
  377. * bytes), so we approximate the old behavior by
  378. * ignoring tables with fewer than one entry.
  379. */
  380. return;
  381. }
  382. keymap = kcalloc(hotkey_num, sizeof(struct key_entry), GFP_KERNEL);
  383. if (!keymap) {
  384. results->err = -ENOMEM;
  385. return;
  386. }
  387. for (i = 0; i < hotkey_num; i++) {
  388. const struct dell_bios_keymap_entry *bios_entry =
  389. &table->keymap[i];
  390. /* Uninitialized entries are 0 aka KEY_RESERVED. */
  391. u16 keycode = (bios_entry->keycode <
  392. ARRAY_SIZE(bios_to_linux_keycode)) ?
  393. bios_to_linux_keycode[bios_entry->keycode] :
  394. KEY_RESERVED;
  395. /*
  396. * Log if we find an entry in the DMI table that we don't
  397. * understand. If this happens, we should figure out what
  398. * the entry means and add it to bios_to_linux_keycode.
  399. */
  400. if (keycode == KEY_RESERVED) {
  401. pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n",
  402. bios_entry->scancode, bios_entry->keycode);
  403. continue;
  404. }
  405. if (keycode == KEY_KBDILLUMTOGGLE)
  406. keymap[pos].type = KE_IGNORE;
  407. else
  408. keymap[pos].type = KE_KEY;
  409. keymap[pos].code = bios_entry->scancode;
  410. keymap[pos].keycode = keycode;
  411. pos++;
  412. }
  413. results->keymap = keymap;
  414. results->keymap_size = pos;
  415. }
  416. static int dell_wmi_input_setup(struct wmi_device *wdev)
  417. {
  418. struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
  419. struct dell_dmi_results dmi_results = {};
  420. struct key_entry *keymap;
  421. int err, i, pos = 0;
  422. priv->input_dev = input_allocate_device();
  423. if (!priv->input_dev)
  424. return -ENOMEM;
  425. priv->input_dev->name = "Dell WMI hotkeys";
  426. priv->input_dev->id.bustype = BUS_HOST;
  427. priv->input_dev->dev.parent = &wdev->dev;
  428. if (dmi_walk(handle_dmi_entry, &dmi_results)) {
  429. /*
  430. * Historically, dell-wmi ignored dmi_walk errors. A failure
  431. * is certainly surprising, but it probably just indicates
  432. * a very old laptop.
  433. */
  434. pr_warn("no DMI; using the old-style hotkey interface\n");
  435. }
  436. if (dmi_results.err) {
  437. err = dmi_results.err;
  438. goto err_free_dev;
  439. }
  440. keymap = kcalloc(dmi_results.keymap_size +
  441. ARRAY_SIZE(dell_wmi_keymap_type_0000) +
  442. ARRAY_SIZE(dell_wmi_keymap_type_0010) +
  443. ARRAY_SIZE(dell_wmi_keymap_type_0011) +
  444. 1,
  445. sizeof(struct key_entry), GFP_KERNEL);
  446. if (!keymap) {
  447. kfree(dmi_results.keymap);
  448. err = -ENOMEM;
  449. goto err_free_dev;
  450. }
  451. /* Append table with events of type 0x0010 which comes from DMI */
  452. for (i = 0; i < dmi_results.keymap_size; i++) {
  453. keymap[pos] = dmi_results.keymap[i];
  454. keymap[pos].code |= (0x0010 << 16);
  455. pos++;
  456. }
  457. kfree(dmi_results.keymap);
  458. /* Append table with extra events of type 0x0010 which are not in DMI */
  459. for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0010); i++) {
  460. const struct key_entry *entry = &dell_wmi_keymap_type_0010[i];
  461. /*
  462. * Check if we've already found this scancode. This takes
  463. * quadratic time, but it doesn't matter unless the list
  464. * of extra keys gets very long.
  465. */
  466. if (dmi_results.keymap_size &&
  467. have_scancode(entry->code | (0x0010 << 16),
  468. keymap, dmi_results.keymap_size)
  469. )
  470. continue;
  471. keymap[pos] = *entry;
  472. keymap[pos].code |= (0x0010 << 16);
  473. pos++;
  474. }
  475. /* Append table with events of type 0x0011 */
  476. for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0011); i++) {
  477. keymap[pos] = dell_wmi_keymap_type_0011[i];
  478. keymap[pos].code |= (0x0011 << 16);
  479. pos++;
  480. }
  481. /*
  482. * Now append also table with "legacy" events of type 0x0000. Some of
  483. * them are reported also on laptops which have scancodes in DMI.
  484. */
  485. for (i = 0; i < ARRAY_SIZE(dell_wmi_keymap_type_0000); i++) {
  486. keymap[pos] = dell_wmi_keymap_type_0000[i];
  487. pos++;
  488. }
  489. keymap[pos].type = KE_END;
  490. err = sparse_keymap_setup(priv->input_dev, keymap, NULL);
  491. /*
  492. * Sparse keymap library makes a copy of keymap so we don't need the
  493. * original one that was allocated.
  494. */
  495. kfree(keymap);
  496. if (err)
  497. goto err_free_dev;
  498. err = input_register_device(priv->input_dev);
  499. if (err)
  500. goto err_free_dev;
  501. return 0;
  502. err_free_dev:
  503. input_free_device(priv->input_dev);
  504. return err;
  505. }
  506. static void dell_wmi_input_destroy(struct wmi_device *wdev)
  507. {
  508. struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
  509. input_unregister_device(priv->input_dev);
  510. }
  511. /*
  512. * According to Dell SMBIOS documentation:
  513. *
  514. * 17 3 Application Program Registration
  515. *
  516. * cbArg1 Application ID 1 = 0x00010000
  517. * cbArg2 Application ID 2
  518. * QUICKSET/DCP = 0x51534554 "QSET"
  519. * ALS Driver = 0x416c7353 "AlsS"
  520. * Latitude ON = 0x4c6f6e52 "LonR"
  521. * cbArg3 Application version or revision number
  522. * cbArg4 0 = Unregister application
  523. * 1 = Register application
  524. * cbRes1 Standard return codes (0, -1, -2)
  525. */
  526. static int dell_wmi_events_set_enabled(bool enable)
  527. {
  528. struct calling_interface_buffer *buffer;
  529. int ret;
  530. buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
  531. if (!buffer)
  532. return -ENOMEM;
  533. buffer->cmd_class = CLASS_INFO;
  534. buffer->cmd_select = SELECT_APP_REGISTRATION;
  535. buffer->input[0] = 0x10000;
  536. buffer->input[1] = 0x51534554;
  537. buffer->input[3] = enable;
  538. ret = dell_smbios_call(buffer);
  539. if (ret == 0)
  540. ret = buffer->output[0];
  541. kfree(buffer);
  542. return dell_smbios_error(ret);
  543. }
  544. static int dell_wmi_probe(struct wmi_device *wdev, const void *context)
  545. {
  546. struct dell_wmi_priv *priv;
  547. int ret;
  548. ret = dell_wmi_get_descriptor_valid();
  549. if (ret)
  550. return ret;
  551. priv = devm_kzalloc(
  552. &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
  553. if (!priv)
  554. return -ENOMEM;
  555. dev_set_drvdata(&wdev->dev, priv);
  556. if (!dell_wmi_get_interface_version(&priv->interface_version))
  557. return -EPROBE_DEFER;
  558. return dell_wmi_input_setup(wdev);
  559. }
  560. static int dell_wmi_remove(struct wmi_device *wdev)
  561. {
  562. dell_wmi_input_destroy(wdev);
  563. return 0;
  564. }
  565. static const struct wmi_device_id dell_wmi_id_table[] = {
  566. { .guid_string = DELL_EVENT_GUID },
  567. { },
  568. };
  569. static struct wmi_driver dell_wmi_driver = {
  570. .driver = {
  571. .name = "dell-wmi",
  572. },
  573. .id_table = dell_wmi_id_table,
  574. .probe = dell_wmi_probe,
  575. .remove = dell_wmi_remove,
  576. .notify = dell_wmi_notify,
  577. };
  578. static int __init dell_wmi_init(void)
  579. {
  580. int err;
  581. dmi_check_system(dell_wmi_smbios_list);
  582. if (wmi_requires_smbios_request) {
  583. err = dell_wmi_events_set_enabled(true);
  584. if (err) {
  585. pr_err("Failed to enable WMI events\n");
  586. return err;
  587. }
  588. }
  589. return wmi_driver_register(&dell_wmi_driver);
  590. }
  591. late_initcall(dell_wmi_init);
  592. static void __exit dell_wmi_exit(void)
  593. {
  594. if (wmi_requires_smbios_request)
  595. dell_wmi_events_set_enabled(false);
  596. wmi_driver_unregister(&dell_wmi_driver);
  597. }
  598. module_exit(dell_wmi_exit);
  599. MODULE_DEVICE_TABLE(wmi, dell_wmi_id_table);