Commit | Line | Data |
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0b3f6109 MG |
1 | /* |
2 | * Dell WMI hotkeys | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat <mjg@redhat.com> | |
595773a4 | 5 | * Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.com> |
0b3f6109 MG |
6 | * |
7 | * Portions based on wistron_btns.c: | |
8 | * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz> | |
9 | * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org> | |
10 | * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | */ | |
26 | ||
eb889524 JP |
27 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
28 | ||
0b3f6109 MG |
29 | #include <linux/kernel.h> |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
0b3f6109 MG |
33 | #include <linux/types.h> |
34 | #include <linux/input.h> | |
890a7c8e | 35 | #include <linux/input/sparse-keymap.h> |
0b3f6109 MG |
36 | #include <linux/acpi.h> |
37 | #include <linux/string.h> | |
5ea25597 | 38 | #include <linux/dmi.h> |
18bd7696 | 39 | #include <acpi/video.h> |
e09c4d5b | 40 | #include "dell-smbios.h" |
0b3f6109 MG |
41 | |
42 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); | |
595773a4 | 43 | MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); |
0b3f6109 MG |
44 | MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver"); |
45 | MODULE_LICENSE("GPL"); | |
46 | ||
47 | #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492" | |
595773a4 | 48 | #define DELL_DESCRIPTOR_GUID "8D9DDCBC-A997-11DA-B012-B622A1EF5492" |
0b3f6109 | 49 | |
595773a4 | 50 | static u32 dell_wmi_interface_version; |
e09c4d5b | 51 | static bool wmi_requires_smbios_request; |
0b3f6109 MG |
52 | |
53 | MODULE_ALIAS("wmi:"DELL_EVENT_GUID); | |
595773a4 | 54 | MODULE_ALIAS("wmi:"DELL_DESCRIPTOR_GUID); |
0b3f6109 | 55 | |
e09c4d5b MK |
56 | static int __init dmi_matched(const struct dmi_system_id *dmi) |
57 | { | |
58 | wmi_requires_smbios_request = 1; | |
59 | return 1; | |
60 | } | |
61 | ||
62 | static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = { | |
aaf3a5e7 MK |
63 | { |
64 | .callback = dmi_matched, | |
65 | .ident = "Dell Inspiron M5110", | |
66 | .matches = { | |
67 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
68 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"), | |
69 | }, | |
70 | }, | |
e09c4d5b MK |
71 | { |
72 | .callback = dmi_matched, | |
73 | .ident = "Dell Vostro V131", | |
74 | .matches = { | |
75 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
76 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), | |
77 | }, | |
78 | }, | |
79 | { } | |
80 | }; | |
81 | ||
5cab0098 ML |
82 | /* |
83 | * Certain keys are flagged as KE_IGNORE. All of these are either | |
84 | * notifications (rather than requests for change) or are also sent | |
85 | * via the keyboard controller so should not be sent again. | |
86 | */ | |
0b3f6109 | 87 | |
890a7c8e | 88 | static const struct key_entry dell_wmi_legacy_keymap[] __initconst = { |
f1566f0d SF |
89 | { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } }, |
90 | ||
890a7c8e DT |
91 | { KE_KEY, 0xe045, { KEY_PROG1 } }, |
92 | { KE_KEY, 0xe009, { KEY_EJECTCD } }, | |
5cab0098 ML |
93 | |
94 | /* These also contain the brightness level at offset 6 */ | |
890a7c8e DT |
95 | { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } }, |
96 | { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } }, | |
5cab0098 ML |
97 | |
98 | /* Battery health status button */ | |
890a7c8e | 99 | { KE_KEY, 0xe007, { KEY_BATTERY } }, |
5cab0098 | 100 | |
8f8d75eb GM |
101 | /* Radio devices state change */ |
102 | { KE_IGNORE, 0xe008, { KEY_RFKILL } }, | |
5cab0098 ML |
103 | |
104 | /* The next device is at offset 6, the active devices are at | |
105 | offset 8 and the attached devices at offset 10 */ | |
890a7c8e | 106 | { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } }, |
5cab0098 | 107 | |
890a7c8e | 108 | { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } }, |
5cab0098 ML |
109 | |
110 | /* BIOS error detected */ | |
890a7c8e | 111 | { KE_IGNORE, 0xe00d, { KEY_RESERVED } }, |
5cab0098 ML |
112 | |
113 | /* Wifi Catcher */ | |
890a7c8e | 114 | { KE_KEY, 0xe011, {KEY_PROG2 } }, |
5cab0098 ML |
115 | |
116 | /* Ambient light sensor toggle */ | |
890a7c8e DT |
117 | { KE_IGNORE, 0xe013, { KEY_RESERVED } }, |
118 | ||
119 | { KE_IGNORE, 0xe020, { KEY_MUTE } }, | |
f1566f0d | 120 | |
aaf3a5e7 | 121 | /* Dell Instant Launch key */ |
13f5059a | 122 | { KE_KEY, 0xe025, { KEY_PROG4 } }, |
aaf3a5e7 MK |
123 | { KE_KEY, 0xe029, { KEY_PROG4 } }, |
124 | ||
125 | /* Audio panel key */ | |
f1566f0d SF |
126 | { KE_IGNORE, 0xe026, { KEY_RESERVED } }, |
127 | ||
890a7c8e DT |
128 | { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } }, |
129 | { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } }, | |
130 | { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } }, | |
131 | { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } }, | |
132 | { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } }, | |
133 | { KE_IGNORE, 0xe045, { KEY_NUMLOCK } }, | |
134 | { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } }, | |
f1566f0d SF |
135 | { KE_IGNORE, 0xe0f7, { KEY_MUTE } }, |
136 | { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } }, | |
137 | { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } }, | |
890a7c8e | 138 | { KE_END, 0 } |
0b3f6109 MG |
139 | }; |
140 | ||
5ea25597 RK |
141 | static bool dell_new_hk_type; |
142 | ||
890a7c8e | 143 | struct dell_bios_keymap_entry { |
5ea25597 RK |
144 | u16 scancode; |
145 | u16 keycode; | |
146 | }; | |
147 | ||
890a7c8e | 148 | struct dell_bios_hotkey_table { |
5ea25597 | 149 | struct dmi_header header; |
890a7c8e | 150 | struct dell_bios_keymap_entry keymap[]; |
5ea25597 RK |
151 | |
152 | }; | |
153 | ||
18b6f80f AL |
154 | struct dell_dmi_results { |
155 | int err; | |
156 | struct key_entry *keymap; | |
157 | }; | |
5ea25597 | 158 | |
cbc61f11 | 159 | /* Uninitialized entries here are KEY_RESERVED == 0. */ |
890a7c8e | 160 | static const u16 bios_to_linux_keycode[256] __initconst = { |
394cb778 AL |
161 | [0] = KEY_MEDIA, |
162 | [1] = KEY_NEXTSONG, | |
163 | [2] = KEY_PLAYPAUSE, | |
164 | [3] = KEY_PREVIOUSSONG, | |
165 | [4] = KEY_STOPCD, | |
166 | [5] = KEY_UNKNOWN, | |
167 | [6] = KEY_UNKNOWN, | |
168 | [7] = KEY_UNKNOWN, | |
169 | [8] = KEY_WWW, | |
170 | [9] = KEY_UNKNOWN, | |
171 | [10] = KEY_VOLUMEDOWN, | |
172 | [11] = KEY_MUTE, | |
173 | [12] = KEY_VOLUMEUP, | |
174 | [13] = KEY_UNKNOWN, | |
175 | [14] = KEY_BATTERY, | |
176 | [15] = KEY_EJECTCD, | |
177 | [16] = KEY_UNKNOWN, | |
178 | [17] = KEY_SLEEP, | |
179 | [18] = KEY_PROG1, | |
180 | [19] = KEY_BRIGHTNESSDOWN, | |
181 | [20] = KEY_BRIGHTNESSUP, | |
182 | [21] = KEY_UNKNOWN, | |
183 | [22] = KEY_KBDILLUMTOGGLE, | |
184 | [23] = KEY_UNKNOWN, | |
185 | [24] = KEY_SWITCHVIDEOMODE, | |
186 | [25] = KEY_UNKNOWN, | |
187 | [26] = KEY_UNKNOWN, | |
188 | [27] = KEY_SWITCHVIDEOMODE, | |
189 | [28] = KEY_UNKNOWN, | |
190 | [29] = KEY_UNKNOWN, | |
191 | [30] = KEY_PROG2, | |
192 | [31] = KEY_UNKNOWN, | |
193 | [32] = KEY_UNKNOWN, | |
194 | [33] = KEY_UNKNOWN, | |
195 | [34] = KEY_UNKNOWN, | |
196 | [35] = KEY_UNKNOWN, | |
197 | [36] = KEY_UNKNOWN, | |
198 | [37] = KEY_UNKNOWN, | |
199 | [38] = KEY_MICMUTE, | |
200 | [255] = KEY_PROG3, | |
5ea25597 RK |
201 | }; |
202 | ||
a464afb9 AL |
203 | /* |
204 | * These are applied if the 0xB2 DMI hotkey table is present and doesn't | |
205 | * override them. | |
206 | */ | |
207 | static const struct key_entry dell_wmi_extra_keymap[] __initconst = { | |
208 | /* Fn-lock */ | |
209 | { KE_IGNORE, 0x151, { KEY_RESERVED } }, | |
210 | ||
211 | /* Change keyboard illumination */ | |
212 | { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } }, | |
213 | ||
214 | /* | |
215 | * Radio disable (notify only -- there is no model for which the | |
216 | * WMI event is supposed to trigger an action). | |
217 | */ | |
218 | { KE_IGNORE, 0x153, { KEY_RFKILL } }, | |
219 | ||
220 | /* RGB keyboard backlight control */ | |
221 | { KE_IGNORE, 0x154, { KEY_RESERVED } }, | |
222 | ||
223 | /* Stealth mode toggle */ | |
224 | { KE_IGNORE, 0x155, { KEY_RESERVED } }, | |
225 | }; | |
226 | ||
0b3f6109 MG |
227 | static struct input_dev *dell_wmi_input_dev; |
228 | ||
83fc44c3 PR |
229 | static void dell_wmi_process_key(int reported_key) |
230 | { | |
231 | const struct key_entry *key; | |
232 | ||
233 | key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev, | |
234 | reported_key); | |
235 | if (!key) { | |
cbc61f11 AL |
236 | pr_info("Unknown key with scancode 0x%x pressed\n", |
237 | reported_key); | |
83fc44c3 PR |
238 | return; |
239 | } | |
240 | ||
241 | pr_debug("Key %x pressed\n", reported_key); | |
242 | ||
243 | /* Don't report brightness notifications that will also come via ACPI */ | |
244 | if ((key->keycode == KEY_BRIGHTNESSUP || | |
61679c72 HG |
245 | key->keycode == KEY_BRIGHTNESSDOWN) && |
246 | acpi_video_handles_brightness_key_presses()) | |
83fc44c3 PR |
247 | return; |
248 | ||
13f5059a MK |
249 | if (reported_key == 0xe025 && !wmi_requires_smbios_request) |
250 | return; | |
251 | ||
83fc44c3 PR |
252 | sparse_keymap_report_entry(dell_wmi_input_dev, key, 1, true); |
253 | } | |
254 | ||
0b3f6109 MG |
255 | static void dell_wmi_notify(u32 value, void *context) |
256 | { | |
257 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
0b3f6109 | 258 | union acpi_object *obj; |
fda11e61 | 259 | acpi_status status; |
83fc44c3 PR |
260 | acpi_size buffer_size; |
261 | u16 *buffer_entry, *buffer_end; | |
262 | int len, i; | |
0b3f6109 | 263 | |
fda11e61 LB |
264 | status = wmi_get_event_data(value, &response); |
265 | if (status != AE_OK) { | |
83fc44c3 | 266 | pr_warn("bad event status 0x%x\n", status); |
fda11e61 LB |
267 | return; |
268 | } | |
0b3f6109 MG |
269 | |
270 | obj = (union acpi_object *)response.pointer; | |
83fc44c3 PR |
271 | if (!obj) { |
272 | pr_warn("no response\n"); | |
273 | return; | |
274 | } | |
0b3f6109 | 275 | |
83fc44c3 PR |
276 | if (obj->type != ACPI_TYPE_BUFFER) { |
277 | pr_warn("bad response type %x\n", obj->type); | |
278 | kfree(obj); | |
279 | return; | |
280 | } | |
281 | ||
282 | pr_debug("Received WMI event (%*ph)\n", | |
283 | obj->buffer.length, obj->buffer.pointer); | |
5ea25597 | 284 | |
83fc44c3 PR |
285 | buffer_entry = (u16 *)obj->buffer.pointer; |
286 | buffer_size = obj->buffer.length/2; | |
287 | ||
288 | if (!dell_new_hk_type) { | |
289 | if (buffer_size >= 3 && buffer_entry[1] == 0x0) | |
290 | dell_wmi_process_key(buffer_entry[2]); | |
a666b6ff | 291 | else if (buffer_size >= 2) |
83fc44c3 PR |
292 | dell_wmi_process_key(buffer_entry[1]); |
293 | else | |
a666b6ff | 294 | pr_info("Received unknown WMI event\n"); |
83fc44c3 PR |
295 | kfree(obj); |
296 | return; | |
297 | } | |
298 | ||
299 | buffer_end = buffer_entry + buffer_size; | |
300 | ||
481fe5be PR |
301 | /* |
302 | * BIOS/ACPI on devices with WMI interface version 0 does not clear | |
303 | * buffer before filling it. So next time when BIOS/ACPI send WMI event | |
304 | * which is smaller as previous then it contains garbage in buffer from | |
305 | * previous event. | |
306 | * | |
307 | * BIOS/ACPI on devices with WMI interface version 1 clears buffer and | |
308 | * sometimes send more events in buffer at one call. | |
309 | * | |
310 | * So to prevent reading garbage from buffer we will process only first | |
311 | * one event on devices with WMI interface version 0. | |
312 | */ | |
313 | if (dell_wmi_interface_version == 0 && buffer_entry < buffer_end) | |
314 | if (buffer_end > buffer_entry + buffer_entry[0] + 1) | |
315 | buffer_end = buffer_entry + buffer_entry[0] + 1; | |
316 | ||
83fc44c3 PR |
317 | while (buffer_entry < buffer_end) { |
318 | ||
319 | len = buffer_entry[0]; | |
320 | if (len == 0) | |
321 | break; | |
322 | ||
323 | len++; | |
324 | ||
325 | if (buffer_entry + len > buffer_end) { | |
326 | pr_warn("Invalid length of WMI event\n"); | |
327 | break; | |
a666b6ff | 328 | } |
5ea25597 | 329 | |
83fc44c3 PR |
330 | pr_debug("Process buffer (%*ph)\n", len*2, buffer_entry); |
331 | ||
332 | switch (buffer_entry[1]) { | |
333 | case 0x00: | |
334 | for (i = 2; i < len; ++i) { | |
335 | switch (buffer_entry[i]) { | |
336 | case 0xe043: | |
337 | /* NIC Link is Up */ | |
338 | pr_debug("NIC Link is Up\n"); | |
339 | break; | |
340 | case 0xe044: | |
341 | /* NIC Link is Down */ | |
342 | pr_debug("NIC Link is Down\n"); | |
343 | break; | |
344 | case 0xe045: | |
345 | /* Unknown event but defined in DSDT */ | |
346 | default: | |
347 | /* Unknown event */ | |
348 | pr_info("Unknown WMI event type 0x00: " | |
349 | "0x%x\n", (int)buffer_entry[i]); | |
350 | break; | |
351 | } | |
352 | } | |
353 | break; | |
354 | case 0x10: | |
355 | /* Keys pressed */ | |
356 | for (i = 2; i < len; ++i) | |
357 | dell_wmi_process_key(buffer_entry[i]); | |
358 | break; | |
359 | case 0x11: | |
360 | for (i = 2; i < len; ++i) { | |
361 | switch (buffer_entry[i]) { | |
362 | case 0xfff0: | |
363 | /* Battery unplugged */ | |
364 | pr_debug("Battery unplugged\n"); | |
365 | break; | |
366 | case 0xfff1: | |
367 | /* Battery inserted */ | |
368 | pr_debug("Battery inserted\n"); | |
369 | break; | |
370 | case 0x01e1: | |
371 | case 0x02ea: | |
372 | case 0x02eb: | |
373 | case 0x02ec: | |
374 | case 0x02f6: | |
375 | /* Keyboard backlight level changed */ | |
376 | pr_debug("Keyboard backlight level " | |
377 | "changed\n"); | |
378 | break; | |
379 | default: | |
380 | /* Unknown event */ | |
381 | pr_info("Unknown WMI event type 0x11: " | |
382 | "0x%x\n", (int)buffer_entry[i]); | |
383 | break; | |
384 | } | |
385 | } | |
386 | break; | |
387 | default: | |
388 | /* Unknown event */ | |
389 | pr_info("Unknown WMI event type 0x%x\n", | |
390 | (int)buffer_entry[1]); | |
391 | break; | |
5ea25597 | 392 | } |
83fc44c3 PR |
393 | |
394 | buffer_entry += len; | |
395 | ||
0b3f6109 | 396 | } |
83fc44c3 | 397 | |
3e9b988e | 398 | kfree(obj); |
0b3f6109 MG |
399 | } |
400 | ||
a464afb9 AL |
401 | static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len) |
402 | { | |
403 | int i; | |
404 | ||
405 | for (i = 0; i < len; i++) | |
406 | if (keymap[i].code == scancode) | |
407 | return true; | |
408 | ||
409 | return false; | |
410 | } | |
411 | ||
18b6f80f | 412 | static void __init handle_dmi_entry(const struct dmi_header *dm, |
a464afb9 | 413 | |
18b6f80f | 414 | void *opaque) |
a464afb9 | 415 | |
5ea25597 | 416 | { |
18b6f80f AL |
417 | struct dell_dmi_results *results = opaque; |
418 | struct dell_bios_hotkey_table *table; | |
a464afb9 | 419 | int hotkey_num, i, pos = 0; |
890a7c8e | 420 | struct key_entry *keymap; |
a464afb9 | 421 | int num_bios_keys; |
18b6f80f AL |
422 | |
423 | if (results->err || results->keymap) | |
424 | return; /* We already found the hotkey table. */ | |
425 | ||
b13de701 | 426 | if (dm->type != 0xb2) |
18b6f80f AL |
427 | return; |
428 | ||
429 | table = container_of(dm, struct dell_bios_hotkey_table, header); | |
430 | ||
b13de701 AL |
431 | hotkey_num = (table->header.length - |
432 | sizeof(struct dell_bios_hotkey_table)) / | |
18b6f80f | 433 | sizeof(struct dell_bios_keymap_entry); |
b13de701 AL |
434 | if (hotkey_num < 1) { |
435 | /* | |
436 | * Historically, dell-wmi would ignore a DMI entry of | |
437 | * fewer than 7 bytes. Sizes between 4 and 8 bytes are | |
438 | * nonsensical (both the header and all entries are 4 | |
439 | * bytes), so we approximate the old behavior by | |
440 | * ignoring tables with fewer than one entry. | |
441 | */ | |
442 | return; | |
443 | } | |
5ea25597 | 444 | |
a464afb9 AL |
445 | keymap = kcalloc(hotkey_num + ARRAY_SIZE(dell_wmi_extra_keymap) + 1, |
446 | sizeof(struct key_entry), GFP_KERNEL); | |
18b6f80f AL |
447 | if (!keymap) { |
448 | results->err = -ENOMEM; | |
449 | return; | |
450 | } | |
5ea25597 RK |
451 | |
452 | for (i = 0; i < hotkey_num; i++) { | |
890a7c8e | 453 | const struct dell_bios_keymap_entry *bios_entry = |
18b6f80f | 454 | &table->keymap[i]; |
cbc61f11 AL |
455 | |
456 | /* Uninitialized entries are 0 aka KEY_RESERVED. */ | |
457 | u16 keycode = (bios_entry->keycode < | |
458 | ARRAY_SIZE(bios_to_linux_keycode)) ? | |
459 | bios_to_linux_keycode[bios_entry->keycode] : | |
460 | KEY_RESERVED; | |
461 | ||
462 | /* | |
463 | * Log if we find an entry in the DMI table that we don't | |
464 | * understand. If this happens, we should figure out what | |
465 | * the entry means and add it to bios_to_linux_keycode. | |
466 | */ | |
467 | if (keycode == KEY_RESERVED) { | |
468 | pr_info("firmware scancode 0x%x maps to unrecognized keycode 0x%x\n", | |
469 | bios_entry->scancode, bios_entry->keycode); | |
470 | continue; | |
471 | } | |
8cb8e63b GM |
472 | |
473 | if (keycode == KEY_KBDILLUMTOGGLE) | |
a464afb9 | 474 | keymap[pos].type = KE_IGNORE; |
8cb8e63b | 475 | else |
a464afb9 AL |
476 | keymap[pos].type = KE_KEY; |
477 | keymap[pos].code = bios_entry->scancode; | |
478 | keymap[pos].keycode = keycode; | |
479 | ||
480 | pos++; | |
481 | } | |
482 | ||
483 | num_bios_keys = pos; | |
484 | ||
485 | for (i = 0; i < ARRAY_SIZE(dell_wmi_extra_keymap); i++) { | |
486 | const struct key_entry *entry = &dell_wmi_extra_keymap[i]; | |
487 | ||
488 | /* | |
489 | * Check if we've already found this scancode. This takes | |
490 | * quadratic time, but it doesn't matter unless the list | |
491 | * of extra keys gets very long. | |
492 | */ | |
493 | if (!have_scancode(entry->code, keymap, num_bios_keys)) { | |
494 | keymap[pos] = *entry; | |
495 | pos++; | |
496 | } | |
5ea25597 RK |
497 | } |
498 | ||
a464afb9 | 499 | keymap[pos].type = KE_END; |
5ea25597 | 500 | |
18b6f80f | 501 | results->keymap = keymap; |
5ea25597 RK |
502 | } |
503 | ||
0b3f6109 MG |
504 | static int __init dell_wmi_input_setup(void) |
505 | { | |
18b6f80f | 506 | struct dell_dmi_results dmi_results = {}; |
0b3f6109 MG |
507 | int err; |
508 | ||
509 | dell_wmi_input_dev = input_allocate_device(); | |
0b3f6109 MG |
510 | if (!dell_wmi_input_dev) |
511 | return -ENOMEM; | |
512 | ||
513 | dell_wmi_input_dev->name = "Dell WMI hotkeys"; | |
514 | dell_wmi_input_dev->phys = "wmi/input0"; | |
515 | dell_wmi_input_dev->id.bustype = BUS_HOST; | |
890a7c8e | 516 | |
18b6f80f AL |
517 | if (dmi_walk(handle_dmi_entry, &dmi_results)) { |
518 | /* | |
519 | * Historically, dell-wmi ignored dmi_walk errors. A failure | |
520 | * is certainly surprising, but it probably just indicates | |
521 | * a very old laptop. | |
522 | */ | |
523 | pr_warn("no DMI; using the old-style hotkey interface\n"); | |
524 | } | |
525 | ||
526 | if (dmi_results.err) { | |
527 | err = dmi_results.err; | |
528 | goto err_free_dev; | |
529 | } | |
530 | ||
531 | if (dmi_results.keymap) { | |
532 | dell_new_hk_type = true; | |
0b3f6109 | 533 | |
18b6f80f AL |
534 | err = sparse_keymap_setup(dell_wmi_input_dev, |
535 | dmi_results.keymap, NULL); | |
0b3f6109 | 536 | |
890a7c8e DT |
537 | /* |
538 | * Sparse keymap library makes a copy of keymap so we | |
539 | * don't need the original one that was allocated. | |
540 | */ | |
18b6f80f | 541 | kfree(dmi_results.keymap); |
890a7c8e DT |
542 | } else { |
543 | err = sparse_keymap_setup(dell_wmi_input_dev, | |
544 | dell_wmi_legacy_keymap, NULL); | |
0b3f6109 | 545 | } |
890a7c8e DT |
546 | if (err) |
547 | goto err_free_dev; | |
548 | ||
549 | err = input_register_device(dell_wmi_input_dev); | |
550 | if (err) | |
551 | goto err_free_keymap; | |
0b3f6109 MG |
552 | |
553 | return 0; | |
890a7c8e DT |
554 | |
555 | err_free_keymap: | |
556 | sparse_keymap_free(dell_wmi_input_dev); | |
557 | err_free_dev: | |
558 | input_free_device(dell_wmi_input_dev); | |
559 | return err; | |
560 | } | |
561 | ||
562 | static void dell_wmi_input_destroy(void) | |
563 | { | |
564 | sparse_keymap_free(dell_wmi_input_dev); | |
565 | input_unregister_device(dell_wmi_input_dev); | |
566 | } | |
567 | ||
595773a4 PR |
568 | /* |
569 | * Descriptor buffer is 128 byte long and contains: | |
570 | * | |
571 | * Name Offset Length Value | |
572 | * Vendor Signature 0 4 "DELL" | |
573 | * Object Signature 4 4 " WMI" | |
574 | * WMI Interface Version 8 4 <version> | |
575 | * WMI buffer length 12 4 4096 | |
576 | */ | |
577 | static int __init dell_wmi_check_descriptor_buffer(void) | |
578 | { | |
579 | struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; | |
580 | union acpi_object *obj; | |
581 | acpi_status status; | |
582 | u32 *buffer; | |
583 | ||
584 | status = wmi_query_block(DELL_DESCRIPTOR_GUID, 0, &out); | |
585 | if (ACPI_FAILURE(status)) { | |
586 | pr_err("Cannot read Dell descriptor buffer - %d\n", status); | |
587 | return status; | |
588 | } | |
589 | ||
590 | obj = (union acpi_object *)out.pointer; | |
591 | if (!obj) { | |
592 | pr_err("Dell descriptor buffer is empty\n"); | |
593 | return -EINVAL; | |
594 | } | |
595 | ||
596 | if (obj->type != ACPI_TYPE_BUFFER) { | |
597 | pr_err("Cannot read Dell descriptor buffer\n"); | |
598 | kfree(obj); | |
599 | return -EINVAL; | |
600 | } | |
601 | ||
602 | if (obj->buffer.length != 128) { | |
603 | pr_err("Dell descriptor buffer has invalid length (%d)\n", | |
604 | obj->buffer.length); | |
605 | if (obj->buffer.length < 16) { | |
606 | kfree(obj); | |
607 | return -EINVAL; | |
608 | } | |
609 | } | |
610 | ||
611 | buffer = (u32 *)obj->buffer.pointer; | |
612 | ||
613 | if (buffer[0] != 0x4C4C4544 && buffer[1] != 0x494D5720) | |
614 | pr_warn("Dell descriptor buffer has invalid signature (%*ph)\n", | |
615 | 8, buffer); | |
616 | ||
617 | if (buffer[2] != 0 && buffer[2] != 1) | |
618 | pr_warn("Dell descriptor buffer has unknown version (%d)\n", | |
619 | buffer[2]); | |
620 | ||
621 | if (buffer[3] != 4096) | |
622 | pr_warn("Dell descriptor buffer has invalid buffer length (%d)\n", | |
623 | buffer[3]); | |
624 | ||
625 | dell_wmi_interface_version = buffer[2]; | |
626 | ||
627 | pr_info("Detected Dell WMI interface version %u\n", | |
628 | dell_wmi_interface_version); | |
629 | ||
630 | kfree(obj); | |
631 | return 0; | |
632 | } | |
633 | ||
e09c4d5b MK |
634 | /* |
635 | * According to Dell SMBIOS documentation: | |
636 | * | |
637 | * 17 3 Application Program Registration | |
638 | * | |
639 | * cbArg1 Application ID 1 = 0x00010000 | |
640 | * cbArg2 Application ID 2 | |
641 | * QUICKSET/DCP = 0x51534554 "QSET" | |
642 | * ALS Driver = 0x416c7353 "AlsS" | |
643 | * Latitude ON = 0x4c6f6e52 "LonR" | |
644 | * cbArg3 Application version or revision number | |
645 | * cbArg4 0 = Unregister application | |
646 | * 1 = Register application | |
647 | * cbRes1 Standard return codes (0, -1, -2) | |
648 | */ | |
649 | ||
650 | static int dell_wmi_events_set_enabled(bool enable) | |
651 | { | |
652 | struct calling_interface_buffer *buffer; | |
653 | int ret; | |
654 | ||
655 | buffer = dell_smbios_get_buffer(); | |
656 | buffer->input[0] = 0x10000; | |
657 | buffer->input[1] = 0x51534554; | |
658 | buffer->input[3] = enable; | |
659 | dell_smbios_send_request(17, 3); | |
660 | ret = buffer->output[0]; | |
661 | dell_smbios_release_buffer(); | |
662 | ||
663 | return dell_smbios_error(ret); | |
664 | } | |
665 | ||
0b3f6109 MG |
666 | static int __init dell_wmi_init(void) |
667 | { | |
668 | int err; | |
abb631bf | 669 | acpi_status status; |
0b3f6109 | 670 | |
595773a4 PR |
671 | if (!wmi_has_guid(DELL_EVENT_GUID) || |
672 | !wmi_has_guid(DELL_DESCRIPTOR_GUID)) { | |
673 | pr_warn("Dell WMI GUID were not found\n"); | |
1fdd407f DT |
674 | return -ENODEV; |
675 | } | |
5ea25597 | 676 | |
595773a4 PR |
677 | err = dell_wmi_check_descriptor_buffer(); |
678 | if (err) | |
679 | return err; | |
680 | ||
1fdd407f | 681 | err = dell_wmi_input_setup(); |
890a7c8e | 682 | if (err) |
1fdd407f | 683 | return err; |
5ea25597 | 684 | |
abb631bf | 685 | status = wmi_install_notify_handler(DELL_EVENT_GUID, |
1fdd407f | 686 | dell_wmi_notify, NULL); |
abb631bf | 687 | if (ACPI_FAILURE(status)) { |
890a7c8e | 688 | dell_wmi_input_destroy(); |
eb889524 | 689 | pr_err("Unable to register notify handler - %d\n", status); |
abb631bf | 690 | return -ENODEV; |
1fdd407f | 691 | } |
0b3f6109 | 692 | |
e09c4d5b MK |
693 | dmi_check_system(dell_wmi_smbios_list); |
694 | ||
695 | if (wmi_requires_smbios_request) { | |
696 | err = dell_wmi_events_set_enabled(true); | |
697 | if (err) { | |
698 | pr_err("Failed to enable WMI events\n"); | |
699 | wmi_remove_notify_handler(DELL_EVENT_GUID); | |
700 | dell_wmi_input_destroy(); | |
701 | return err; | |
702 | } | |
703 | } | |
704 | ||
0b3f6109 MG |
705 | return 0; |
706 | } | |
890a7c8e | 707 | module_init(dell_wmi_init); |
0b3f6109 MG |
708 | |
709 | static void __exit dell_wmi_exit(void) | |
710 | { | |
e09c4d5b MK |
711 | if (wmi_requires_smbios_request) |
712 | dell_wmi_events_set_enabled(false); | |
1fdd407f | 713 | wmi_remove_notify_handler(DELL_EVENT_GUID); |
890a7c8e | 714 | dell_wmi_input_destroy(); |
0b3f6109 | 715 | } |
0b3f6109 | 716 | module_exit(dell_wmi_exit); |