1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Huawei WMI laptop extras driver
4 *
5 * Copyright (C) 2018 Ayman Bagabas <ayman.bagabas@gmail.com>
6 */
7
8 #include <linux/acpi.h>
9 #include <linux/debugfs.h>
10 #include <linux/delay.h>
11 #include <linux/dmi.h>
12 #include <linux/input.h>
13 #include <linux/input/sparse-keymap.h>
14 #include <linux/leds.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/platform_device.h>
18 #include <linux/power_supply.h>
19 #include <linux/sysfs.h>
20 #include <linux/wmi.h>
21 #include <acpi/battery.h>
22
23 /*
24 * Huawei WMI GUIDs
25 */
26 #define HWMI_METHOD_GUID "ABBC0F5B-8EA1-11D1-A000-C90629100000"
27 #define HWMI_EVENT_GUID "ABBC0F5C-8EA1-11D1-A000-C90629100000"
28
29 /* Legacy GUIDs */
30 #define WMI0_EXPENSIVE_GUID "39142400-C6A3-40fa-BADB-8A2652834100"
31 #define WMI0_EVENT_GUID "59142400-C6A3-40fa-BADB-8A2652834100"
32
33 /* HWMI commands */
34
35 enum {
36 BATTERY_THRESH_GET = 0x00001103, /* \GBTT */
37 BATTERY_THRESH_SET = 0x00001003, /* \SBTT */
38 FN_LOCK_GET = 0x00000604, /* \GFRS */
39 FN_LOCK_SET = 0x00000704, /* \SFRS */
40 MICMUTE_LED_SET = 0x00000b04, /* \SMLS */
41 };
42
43 union hwmi_arg {
44 u64 cmd;
45 u8 args[8];
46 };
47
48 struct quirk_entry {
49 bool battery_reset;
50 bool ec_micmute;
51 bool report_brightness;
52 };
53
54 static struct quirk_entry *quirks;
55
56 struct huawei_wmi_debug {
57 struct dentry *root;
58 u64 arg;
59 };
60
61 struct huawei_wmi {
62 bool battery_available;
63 bool fn_lock_available;
64
65 struct huawei_wmi_debug debug;
66 struct led_classdev cdev;
67 struct device *dev;
68
69 struct mutex wmi_lock;
70 };
71
72 static struct huawei_wmi *huawei_wmi;
73
74 static const struct key_entry huawei_wmi_keymap[] = {
75 { KE_KEY, 0x281, { KEY_BRIGHTNESSDOWN } },
76 { KE_KEY, 0x282, { KEY_BRIGHTNESSUP } },
77 { KE_KEY, 0x284, { KEY_MUTE } },
78 { KE_KEY, 0x285, { KEY_VOLUMEDOWN } },
79 { KE_KEY, 0x286, { KEY_VOLUMEUP } },
80 { KE_KEY, 0x287, { KEY_MICMUTE } },
81 { KE_KEY, 0x289, { KEY_WLAN } },
82 // Huawei |M| key
83 { KE_KEY, 0x28a, { KEY_CONFIG } },
84 // Keyboard backlit
85 { KE_IGNORE, 0x293, { KEY_KBDILLUMTOGGLE } },
86 { KE_IGNORE, 0x294, { KEY_KBDILLUMUP } },
87 { KE_IGNORE, 0x295, { KEY_KBDILLUMUP } },
88 // Ignore Ambient Light Sensoring
89 { KE_KEY, 0x2c1, { KEY_RESERVED } },
90 { KE_END, 0 }
91 };
92
93 static int battery_reset = -1;
94 static int report_brightness = -1;
95
96 module_param(battery_reset, bint, 0444);
97 MODULE_PARM_DESC(battery_reset,
98 "Reset battery charge values to (0-0) before disabling it using (0-100)");
99 module_param(report_brightness, bint, 0444);
100 MODULE_PARM_DESC(report_brightness,
101 "Report brightness keys.");
102
103 /* Quirks */
104
dmi_matched(const struct dmi_system_id * dmi)105 static int __init dmi_matched(const struct dmi_system_id *dmi)
106 {
107 quirks = dmi->driver_data;
108 return 1;
109 }
110
111 static struct quirk_entry quirk_unknown = {
112 };
113
114 static struct quirk_entry quirk_battery_reset = {
115 .battery_reset = true,
116 };
117
118 static struct quirk_entry quirk_matebook_x = {
119 .ec_micmute = true,
120 .report_brightness = true,
121 };
122
123 static const struct dmi_system_id huawei_quirks[] = {
124 {
125 .callback = dmi_matched,
126 .ident = "Huawei MACH-WX9",
127 .matches = {
128 DMI_MATCH(DMI_SYS_VENDOR, "HUAWEI"),
129 DMI_MATCH(DMI_PRODUCT_NAME, "MACH-WX9"),
130 },
131 .driver_data = &quirk_battery_reset
132 },
133 {
134 .callback = dmi_matched,
135 .ident = "Huawei MateBook X",
136 .matches = {
137 DMI_MATCH(DMI_SYS_VENDOR, "HUAWEI"),
138 DMI_MATCH(DMI_PRODUCT_NAME, "HUAWEI MateBook X")
139 },
140 .driver_data = &quirk_matebook_x
141 },
142 { }
143 };
144
145 /* Utils */
146
huawei_wmi_call(struct huawei_wmi * huawei,struct acpi_buffer * in,struct acpi_buffer * out)147 static int huawei_wmi_call(struct huawei_wmi *huawei,
148 struct acpi_buffer *in, struct acpi_buffer *out)
149 {
150 acpi_status status;
151
152 mutex_lock(&huawei->wmi_lock);
153 status = wmi_evaluate_method(HWMI_METHOD_GUID, 0, 1, in, out);
154 mutex_unlock(&huawei->wmi_lock);
155 if (ACPI_FAILURE(status)) {
156 dev_err(huawei->dev, "Failed to evaluate wmi method\n");
157 return -ENODEV;
158 }
159
160 return 0;
161 }
162
163 /* HWMI takes a 64 bit input and returns either a package with 2 buffers, one of
164 * 4 bytes and the other of 256 bytes, or one buffer of size 0x104 (260) bytes.
165 * The first 4 bytes are ignored, we ignore the first 4 bytes buffer if we got a
166 * package, or skip the first 4 if a buffer of 0x104 is used. The first byte of
167 * the remaining 0x100 sized buffer has the return status of every call. In case
168 * the return status is non-zero, we return -ENODEV but still copy the returned
169 * buffer to the given buffer parameter (buf).
170 */
huawei_wmi_cmd(u64 arg,u8 * buf,size_t buflen)171 static int huawei_wmi_cmd(u64 arg, u8 *buf, size_t buflen)
172 {
173 struct huawei_wmi *huawei = huawei_wmi;
174 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
175 struct acpi_buffer in;
176 union acpi_object *obj;
177 size_t len;
178 int err, i;
179
180 in.length = sizeof(arg);
181 in.pointer = &arg;
182
183 /* Some models require calling HWMI twice to execute a command. We evaluate
184 * HWMI and if we get a non-zero return status we evaluate it again.
185 */
186 for (i = 0; i < 2; i++) {
187 err = huawei_wmi_call(huawei, &in, &out);
188 if (err)
189 goto fail_cmd;
190
191 obj = out.pointer;
192 if (!obj) {
193 err = -EIO;
194 goto fail_cmd;
195 }
196
197 switch (obj->type) {
198 /* Models that implement both "legacy" and HWMI tend to return a 0x104
199 * sized buffer instead of a package of 0x4 and 0x100 buffers.
200 */
201 case ACPI_TYPE_BUFFER:
202 if (obj->buffer.length == 0x104) {
203 // Skip the first 4 bytes.
204 obj->buffer.pointer += 4;
205 len = 0x100;
206 } else {
207 dev_err(huawei->dev, "Bad buffer length, got %d\n", obj->buffer.length);
208 err = -EIO;
209 goto fail_cmd;
210 }
211
212 break;
213 /* HWMI returns a package with 2 buffer elements, one of 4 bytes and the
214 * other is 256 bytes.
215 */
216 case ACPI_TYPE_PACKAGE:
217 if (obj->package.count != 2) {
218 dev_err(huawei->dev, "Bad package count, got %d\n", obj->package.count);
219 err = -EIO;
220 goto fail_cmd;
221 }
222
223 obj = &obj->package.elements[1];
224 if (obj->type != ACPI_TYPE_BUFFER) {
225 dev_err(huawei->dev, "Bad package element type, got %d\n", obj->type);
226 err = -EIO;
227 goto fail_cmd;
228 }
229 len = obj->buffer.length;
230
231 break;
232 /* Shouldn't get here! */
233 default:
234 dev_err(huawei->dev, "Unexpected obj type, got: %d\n", obj->type);
235 err = -EIO;
236 goto fail_cmd;
237 }
238
239 if (!*obj->buffer.pointer)
240 break;
241 }
242
243 err = (*obj->buffer.pointer) ? -ENODEV : 0;
244
245 if (buf) {
246 len = min(buflen, len);
247 memcpy(buf, obj->buffer.pointer, len);
248 }
249
250 fail_cmd:
251 kfree(out.pointer);
252 return err;
253 }
254
255 /* LEDs */
256
huawei_wmi_micmute_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)257 static int huawei_wmi_micmute_led_set(struct led_classdev *led_cdev,
258 enum led_brightness brightness)
259 {
260 /* This is a workaround until the "legacy" interface is implemented. */
261 if (quirks && quirks->ec_micmute) {
262 char *acpi_method;
263 acpi_handle handle;
264 acpi_status status;
265 union acpi_object args[3];
266 struct acpi_object_list arg_list = {
267 .pointer = args,
268 .count = ARRAY_SIZE(args),
269 };
270
271 handle = ec_get_handle();
272 if (!handle)
273 return -ENODEV;
274
275 args[0].type = args[1].type = args[2].type = ACPI_TYPE_INTEGER;
276 args[1].integer.value = 0x04;
277
278 if (acpi_has_method(handle, "SPIN")) {
279 acpi_method = "SPIN";
280 args[0].integer.value = 0;
281 args[2].integer.value = brightness ? 1 : 0;
282 } else if (acpi_has_method(handle, "WPIN")) {
283 acpi_method = "WPIN";
284 args[0].integer.value = 1;
285 args[2].integer.value = brightness ? 0 : 1;
286 } else {
287 return -ENODEV;
288 }
289
290 status = acpi_evaluate_object(handle, acpi_method, &arg_list, NULL);
291 if (ACPI_FAILURE(status))
292 return -ENODEV;
293
294 return 0;
295 } else {
296 union hwmi_arg arg;
297
298 arg.cmd = MICMUTE_LED_SET;
299 arg.args[2] = brightness;
300
301 return huawei_wmi_cmd(arg.cmd, NULL, 0);
302 }
303 }
304
huawei_wmi_leds_setup(struct device * dev)305 static void huawei_wmi_leds_setup(struct device *dev)
306 {
307 struct huawei_wmi *huawei = dev_get_drvdata(dev);
308
309 huawei->cdev.name = "platform::micmute";
310 huawei->cdev.max_brightness = 1;
311 huawei->cdev.brightness_set_blocking = &huawei_wmi_micmute_led_set;
312 huawei->cdev.default_trigger = "audio-micmute";
313 huawei->cdev.brightness = ledtrig_audio_get(LED_AUDIO_MICMUTE);
314 huawei->cdev.dev = dev;
315 huawei->cdev.flags = LED_CORE_SUSPENDRESUME;
316
317 devm_led_classdev_register(dev, &huawei->cdev);
318 }
319
320 /* Battery protection */
321
huawei_wmi_battery_get(int * start,int * end)322 static int huawei_wmi_battery_get(int *start, int *end)
323 {
324 u8 ret[0x100];
325 int err, i;
326
327 err = huawei_wmi_cmd(BATTERY_THRESH_GET, ret, sizeof(ret));
328 if (err)
329 return err;
330
331 /* Find the last two non-zero values. Return status is ignored. */
332 i = ARRAY_SIZE(ret) - 1;
333 do {
334 if (start)
335 *start = ret[i-1];
336 if (end)
337 *end = ret[i];
338 } while (i > 2 && !ret[i--]);
339
340 return 0;
341 }
342
huawei_wmi_battery_set(int start,int end)343 static int huawei_wmi_battery_set(int start, int end)
344 {
345 union hwmi_arg arg;
346 int err;
347
348 if (start < 0 || end < 0 || start > 100 || end > 100)
349 return -EINVAL;
350
351 arg.cmd = BATTERY_THRESH_SET;
352 arg.args[2] = start;
353 arg.args[3] = end;
354
355 /* This is an edge case were some models turn battery protection
356 * off without changing their thresholds values. We clear the
357 * values before turning off protection. Sometimes we need a sleep delay to
358 * make sure these values make their way to EC memory.
359 */
360 if (quirks && quirks->battery_reset && start == 0 && end == 100) {
361 err = huawei_wmi_battery_set(0, 0);
362 if (err)
363 return err;
364
365 msleep(1000);
366 }
367
368 err = huawei_wmi_cmd(arg.cmd, NULL, 0);
369
370 return err;
371 }
372
charge_control_start_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)373 static ssize_t charge_control_start_threshold_show(struct device *dev,
374 struct device_attribute *attr,
375 char *buf)
376 {
377 int err, start;
378
379 err = huawei_wmi_battery_get(&start, NULL);
380 if (err)
381 return err;
382
383 return sprintf(buf, "%d\n", start);
384 }
385
charge_control_end_threshold_show(struct device * dev,struct device_attribute * attr,char * buf)386 static ssize_t charge_control_end_threshold_show(struct device *dev,
387 struct device_attribute *attr,
388 char *buf)
389 {
390 int err, end;
391
392 err = huawei_wmi_battery_get(NULL, &end);
393 if (err)
394 return err;
395
396 return sprintf(buf, "%d\n", end);
397 }
398
charge_control_thresholds_show(struct device * dev,struct device_attribute * attr,char * buf)399 static ssize_t charge_control_thresholds_show(struct device *dev,
400 struct device_attribute *attr,
401 char *buf)
402 {
403 int err, start, end;
404
405 err = huawei_wmi_battery_get(&start, &end);
406 if (err)
407 return err;
408
409 return sprintf(buf, "%d %d\n", start, end);
410 }
411
charge_control_start_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)412 static ssize_t charge_control_start_threshold_store(struct device *dev,
413 struct device_attribute *attr,
414 const char *buf, size_t size)
415 {
416 int err, start, end;
417
418 err = huawei_wmi_battery_get(NULL, &end);
419 if (err)
420 return err;
421
422 if (sscanf(buf, "%d", &start) != 1)
423 return -EINVAL;
424
425 err = huawei_wmi_battery_set(start, end);
426 if (err)
427 return err;
428
429 return size;
430 }
431
charge_control_end_threshold_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)432 static ssize_t charge_control_end_threshold_store(struct device *dev,
433 struct device_attribute *attr,
434 const char *buf, size_t size)
435 {
436 int err, start, end;
437
438 err = huawei_wmi_battery_get(&start, NULL);
439 if (err)
440 return err;
441
442 if (sscanf(buf, "%d", &end) != 1)
443 return -EINVAL;
444
445 err = huawei_wmi_battery_set(start, end);
446 if (err)
447 return err;
448
449 return size;
450 }
451
charge_control_thresholds_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)452 static ssize_t charge_control_thresholds_store(struct device *dev,
453 struct device_attribute *attr,
454 const char *buf, size_t size)
455 {
456 int err, start, end;
457
458 if (sscanf(buf, "%d %d", &start, &end) != 2)
459 return -EINVAL;
460
461 err = huawei_wmi_battery_set(start, end);
462 if (err)
463 return err;
464
465 return size;
466 }
467
468 static DEVICE_ATTR_RW(charge_control_start_threshold);
469 static DEVICE_ATTR_RW(charge_control_end_threshold);
470 static DEVICE_ATTR_RW(charge_control_thresholds);
471
huawei_wmi_battery_add(struct power_supply * battery,struct acpi_battery_hook * hook)472 static int huawei_wmi_battery_add(struct power_supply *battery, struct acpi_battery_hook *hook)
473 {
474 int err = 0;
475
476 err = device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold);
477 if (err)
478 return err;
479
480 err = device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold);
481 if (err)
482 device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold);
483
484 return err;
485 }
486
huawei_wmi_battery_remove(struct power_supply * battery,struct acpi_battery_hook * hook)487 static int huawei_wmi_battery_remove(struct power_supply *battery, struct acpi_battery_hook *hook)
488 {
489 device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold);
490 device_remove_file(&battery->dev, &dev_attr_charge_control_end_threshold);
491
492 return 0;
493 }
494
495 static struct acpi_battery_hook huawei_wmi_battery_hook = {
496 .add_battery = huawei_wmi_battery_add,
497 .remove_battery = huawei_wmi_battery_remove,
498 .name = "Huawei Battery Extension"
499 };
500
huawei_wmi_battery_setup(struct device * dev)501 static void huawei_wmi_battery_setup(struct device *dev)
502 {
503 struct huawei_wmi *huawei = dev_get_drvdata(dev);
504
505 huawei->battery_available = true;
506 if (huawei_wmi_battery_get(NULL, NULL)) {
507 huawei->battery_available = false;
508 return;
509 }
510
511 battery_hook_register(&huawei_wmi_battery_hook);
512 device_create_file(dev, &dev_attr_charge_control_thresholds);
513 }
514
huawei_wmi_battery_exit(struct device * dev)515 static void huawei_wmi_battery_exit(struct device *dev)
516 {
517 struct huawei_wmi *huawei = dev_get_drvdata(dev);
518
519 if (huawei->battery_available) {
520 battery_hook_unregister(&huawei_wmi_battery_hook);
521 device_remove_file(dev, &dev_attr_charge_control_thresholds);
522 }
523 }
524
525 /* Fn lock */
526
huawei_wmi_fn_lock_get(int * on)527 static int huawei_wmi_fn_lock_get(int *on)
528 {
529 u8 ret[0x100] = { 0 };
530 int err, i;
531
532 err = huawei_wmi_cmd(FN_LOCK_GET, ret, 0x100);
533 if (err)
534 return err;
535
536 /* Find the first non-zero value. Return status is ignored. */
537 i = 1;
538 do {
539 if (on)
540 *on = ret[i] - 1; // -1 undefined, 0 off, 1 on.
541 } while (i < 0xff && !ret[i++]);
542
543 return 0;
544 }
545
huawei_wmi_fn_lock_set(int on)546 static int huawei_wmi_fn_lock_set(int on)
547 {
548 union hwmi_arg arg;
549
550 arg.cmd = FN_LOCK_SET;
551 arg.args[2] = on + 1; // 0 undefined, 1 off, 2 on.
552
553 return huawei_wmi_cmd(arg.cmd, NULL, 0);
554 }
555
fn_lock_state_show(struct device * dev,struct device_attribute * attr,char * buf)556 static ssize_t fn_lock_state_show(struct device *dev,
557 struct device_attribute *attr,
558 char *buf)
559 {
560 int err, on;
561
562 err = huawei_wmi_fn_lock_get(&on);
563 if (err)
564 return err;
565
566 return sprintf(buf, "%d\n", on);
567 }
568
fn_lock_state_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)569 static ssize_t fn_lock_state_store(struct device *dev,
570 struct device_attribute *attr,
571 const char *buf, size_t size)
572 {
573 int on, err;
574
575 if (kstrtoint(buf, 10, &on) ||
576 on < 0 || on > 1)
577 return -EINVAL;
578
579 err = huawei_wmi_fn_lock_set(on);
580 if (err)
581 return err;
582
583 return size;
584 }
585
586 static DEVICE_ATTR_RW(fn_lock_state);
587
huawei_wmi_fn_lock_setup(struct device * dev)588 static void huawei_wmi_fn_lock_setup(struct device *dev)
589 {
590 struct huawei_wmi *huawei = dev_get_drvdata(dev);
591
592 huawei->fn_lock_available = true;
593 if (huawei_wmi_fn_lock_get(NULL)) {
594 huawei->fn_lock_available = false;
595 return;
596 }
597
598 device_create_file(dev, &dev_attr_fn_lock_state);
599 }
600
huawei_wmi_fn_lock_exit(struct device * dev)601 static void huawei_wmi_fn_lock_exit(struct device *dev)
602 {
603 struct huawei_wmi *huawei = dev_get_drvdata(dev);
604
605 if (huawei->fn_lock_available)
606 device_remove_file(dev, &dev_attr_fn_lock_state);
607 }
608
609 /* debugfs */
610
huawei_wmi_debugfs_call_dump(struct seq_file * m,void * data,union acpi_object * obj)611 static void huawei_wmi_debugfs_call_dump(struct seq_file *m, void *data,
612 union acpi_object *obj)
613 {
614 struct huawei_wmi *huawei = m->private;
615 int i;
616
617 switch (obj->type) {
618 case ACPI_TYPE_INTEGER:
619 seq_printf(m, "0x%llx", obj->integer.value);
620 break;
621 case ACPI_TYPE_STRING:
622 seq_printf(m, "\"%.*s\"", obj->string.length, obj->string.pointer);
623 break;
624 case ACPI_TYPE_BUFFER:
625 seq_puts(m, "{");
626 for (i = 0; i < obj->buffer.length; i++) {
627 seq_printf(m, "0x%02x", obj->buffer.pointer[i]);
628 if (i < obj->buffer.length - 1)
629 seq_puts(m, ",");
630 }
631 seq_puts(m, "}");
632 break;
633 case ACPI_TYPE_PACKAGE:
634 seq_puts(m, "[");
635 for (i = 0; i < obj->package.count; i++) {
636 huawei_wmi_debugfs_call_dump(m, huawei, &obj->package.elements[i]);
637 if (i < obj->package.count - 1)
638 seq_puts(m, ",");
639 }
640 seq_puts(m, "]");
641 break;
642 default:
643 dev_err(huawei->dev, "Unexpected obj type, got %d\n", obj->type);
644 return;
645 }
646 }
647
huawei_wmi_debugfs_call_show(struct seq_file * m,void * data)648 static int huawei_wmi_debugfs_call_show(struct seq_file *m, void *data)
649 {
650 struct huawei_wmi *huawei = m->private;
651 struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
652 struct acpi_buffer in;
653 union acpi_object *obj;
654 int err;
655
656 in.length = sizeof(u64);
657 in.pointer = &huawei->debug.arg;
658
659 err = huawei_wmi_call(huawei, &in, &out);
660 if (err)
661 return err;
662
663 obj = out.pointer;
664 if (!obj) {
665 err = -EIO;
666 goto fail_debugfs_call;
667 }
668
669 huawei_wmi_debugfs_call_dump(m, huawei, obj);
670
671 fail_debugfs_call:
672 kfree(out.pointer);
673 return err;
674 }
675
676 DEFINE_SHOW_ATTRIBUTE(huawei_wmi_debugfs_call);
677
huawei_wmi_debugfs_setup(struct device * dev)678 static void huawei_wmi_debugfs_setup(struct device *dev)
679 {
680 struct huawei_wmi *huawei = dev_get_drvdata(dev);
681
682 huawei->debug.root = debugfs_create_dir("huawei-wmi", NULL);
683
684 debugfs_create_x64("arg", 0644, huawei->debug.root,
685 &huawei->debug.arg);
686 debugfs_create_file("call", 0400,
687 huawei->debug.root, huawei, &huawei_wmi_debugfs_call_fops);
688 }
689
huawei_wmi_debugfs_exit(struct device * dev)690 static void huawei_wmi_debugfs_exit(struct device *dev)
691 {
692 struct huawei_wmi *huawei = dev_get_drvdata(dev);
693
694 debugfs_remove_recursive(huawei->debug.root);
695 }
696
697 /* Input */
698
huawei_wmi_process_key(struct input_dev * idev,int code)699 static void huawei_wmi_process_key(struct input_dev *idev, int code)
700 {
701 const struct key_entry *key;
702
703 /*
704 * WMI0 uses code 0x80 to indicate a hotkey event.
705 * The actual key is fetched from the method WQ00
706 * using WMI0_EXPENSIVE_GUID.
707 */
708 if (code == 0x80) {
709 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
710 union acpi_object *obj;
711 acpi_status status;
712
713 status = wmi_query_block(WMI0_EXPENSIVE_GUID, 0, &response);
714 if (ACPI_FAILURE(status))
715 return;
716
717 obj = (union acpi_object *)response.pointer;
718 if (obj && obj->type == ACPI_TYPE_INTEGER)
719 code = obj->integer.value;
720
721 kfree(response.pointer);
722 }
723
724 key = sparse_keymap_entry_from_scancode(idev, code);
725 if (!key) {
726 dev_info(&idev->dev, "Unknown key pressed, code: 0x%04x\n", code);
727 return;
728 }
729
730 if (quirks && !quirks->report_brightness &&
731 (key->sw.code == KEY_BRIGHTNESSDOWN ||
732 key->sw.code == KEY_BRIGHTNESSUP))
733 return;
734
735 sparse_keymap_report_entry(idev, key, 1, true);
736 }
737
huawei_wmi_input_notify(u32 value,void * context)738 static void huawei_wmi_input_notify(u32 value, void *context)
739 {
740 struct input_dev *idev = (struct input_dev *)context;
741 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
742 union acpi_object *obj;
743 acpi_status status;
744
745 status = wmi_get_event_data(value, &response);
746 if (ACPI_FAILURE(status)) {
747 dev_err(&idev->dev, "Unable to get event data\n");
748 return;
749 }
750
751 obj = (union acpi_object *)response.pointer;
752 if (obj && obj->type == ACPI_TYPE_INTEGER)
753 huawei_wmi_process_key(idev, obj->integer.value);
754 else
755 dev_err(&idev->dev, "Bad response type\n");
756
757 kfree(response.pointer);
758 }
759
huawei_wmi_input_setup(struct device * dev,const char * guid)760 static int huawei_wmi_input_setup(struct device *dev, const char *guid)
761 {
762 struct input_dev *idev;
763 acpi_status status;
764 int err;
765
766 idev = devm_input_allocate_device(dev);
767 if (!idev)
768 return -ENOMEM;
769
770 idev->name = "Huawei WMI hotkeys";
771 idev->phys = "wmi/input0";
772 idev->id.bustype = BUS_HOST;
773 idev->dev.parent = dev;
774
775 err = sparse_keymap_setup(idev, huawei_wmi_keymap, NULL);
776 if (err)
777 return err;
778
779 err = input_register_device(idev);
780 if (err)
781 return err;
782
783 status = wmi_install_notify_handler(guid, huawei_wmi_input_notify, idev);
784 if (ACPI_FAILURE(status))
785 return -EIO;
786
787 return 0;
788 }
789
huawei_wmi_input_exit(struct device * dev,const char * guid)790 static void huawei_wmi_input_exit(struct device *dev, const char *guid)
791 {
792 wmi_remove_notify_handler(guid);
793 }
794
795 /* Huawei driver */
796
797 static const struct wmi_device_id huawei_wmi_events_id_table[] = {
798 { .guid_string = WMI0_EVENT_GUID },
799 { .guid_string = HWMI_EVENT_GUID },
800 { }
801 };
802
huawei_wmi_probe(struct platform_device * pdev)803 static int huawei_wmi_probe(struct platform_device *pdev)
804 {
805 const struct wmi_device_id *guid = huawei_wmi_events_id_table;
806 int err;
807
808 platform_set_drvdata(pdev, huawei_wmi);
809 huawei_wmi->dev = &pdev->dev;
810
811 while (*guid->guid_string) {
812 if (wmi_has_guid(guid->guid_string)) {
813 err = huawei_wmi_input_setup(&pdev->dev, guid->guid_string);
814 if (err) {
815 dev_err(&pdev->dev, "Failed to setup input on %s\n", guid->guid_string);
816 return err;
817 }
818 }
819
820 guid++;
821 }
822
823 if (wmi_has_guid(HWMI_METHOD_GUID)) {
824 mutex_init(&huawei_wmi->wmi_lock);
825
826 huawei_wmi_leds_setup(&pdev->dev);
827 huawei_wmi_fn_lock_setup(&pdev->dev);
828 huawei_wmi_battery_setup(&pdev->dev);
829 huawei_wmi_debugfs_setup(&pdev->dev);
830 }
831
832 return 0;
833 }
834
huawei_wmi_remove(struct platform_device * pdev)835 static void huawei_wmi_remove(struct platform_device *pdev)
836 {
837 const struct wmi_device_id *guid = huawei_wmi_events_id_table;
838
839 while (*guid->guid_string) {
840 if (wmi_has_guid(guid->guid_string))
841 huawei_wmi_input_exit(&pdev->dev, guid->guid_string);
842
843 guid++;
844 }
845
846 if (wmi_has_guid(HWMI_METHOD_GUID)) {
847 huawei_wmi_debugfs_exit(&pdev->dev);
848 huawei_wmi_battery_exit(&pdev->dev);
849 huawei_wmi_fn_lock_exit(&pdev->dev);
850 }
851 }
852
853 static struct platform_driver huawei_wmi_driver = {
854 .driver = {
855 .name = "huawei-wmi",
856 },
857 .probe = huawei_wmi_probe,
858 .remove_new = huawei_wmi_remove,
859 };
860
huawei_wmi_init(void)861 static __init int huawei_wmi_init(void)
862 {
863 struct platform_device *pdev;
864 int err;
865
866 huawei_wmi = kzalloc(sizeof(struct huawei_wmi), GFP_KERNEL);
867 if (!huawei_wmi)
868 return -ENOMEM;
869
870 quirks = &quirk_unknown;
871 dmi_check_system(huawei_quirks);
872 if (battery_reset != -1)
873 quirks->battery_reset = battery_reset;
874 if (report_brightness != -1)
875 quirks->report_brightness = report_brightness;
876
877 err = platform_driver_register(&huawei_wmi_driver);
878 if (err)
879 goto pdrv_err;
880
881 pdev = platform_device_register_simple("huawei-wmi", PLATFORM_DEVID_NONE, NULL, 0);
882 if (IS_ERR(pdev)) {
883 err = PTR_ERR(pdev);
884 goto pdev_err;
885 }
886
887 return 0;
888
889 pdev_err:
890 platform_driver_unregister(&huawei_wmi_driver);
891 pdrv_err:
892 kfree(huawei_wmi);
893 return err;
894 }
895
huawei_wmi_exit(void)896 static __exit void huawei_wmi_exit(void)
897 {
898 struct platform_device *pdev = to_platform_device(huawei_wmi->dev);
899
900 platform_device_unregister(pdev);
901 platform_driver_unregister(&huawei_wmi_driver);
902
903 kfree(huawei_wmi);
904 }
905
906 module_init(huawei_wmi_init);
907 module_exit(huawei_wmi_exit);
908
909 MODULE_ALIAS("wmi:"HWMI_METHOD_GUID);
910 MODULE_DEVICE_TABLE(wmi, huawei_wmi_events_id_table);
911 MODULE_AUTHOR("Ayman Bagabas <ayman.bagabas@gmail.com>");
912 MODULE_DESCRIPTION("Huawei WMI laptop extras driver");
913 MODULE_LICENSE("GPL v2");
914