4ac2311c00afe9fae55fcf1334522a564fd943e5
[linux-2.6.git] / drivers / platform / x86 / hp-wmi.c
1 /*
2  * HP WMI hotkeys
3  *
4  * Copyright (C) 2008 Red Hat <mjg@redhat.com>
5  *
6  * Portions based on wistron_btns.c:
7  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
8  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
9  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
10  *
11  *  This program is free software; you can redistribute it and/or modify
12  *  it under the terms of the GNU General Public License as published by
13  *  the Free Software Foundation; either version 2 of the License, or
14  *  (at your option) any later version.
15  *
16  *  This program is distributed in the hope that it will be useful,
17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *  GNU General Public License for more details.
20  *
21  *  You should have received a copy of the GNU General Public License
22  *  along with this program; if not, write to the Free Software
23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/input.h>
31 #include <acpi/acpi_drivers.h>
32 #include <linux/platform_device.h>
33 #include <linux/acpi.h>
34 #include <linux/rfkill.h>
35 #include <linux/string.h>
36
37 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
38 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
39 MODULE_LICENSE("GPL");
40
41 MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
42 MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
43
44 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
45 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
46
47 #define HPWMI_DISPLAY_QUERY 0x1
48 #define HPWMI_HDDTEMP_QUERY 0x2
49 #define HPWMI_ALS_QUERY 0x3
50 #define HPWMI_HARDWARE_QUERY 0x4
51 #define HPWMI_WIRELESS_QUERY 0x5
52 #define HPWMI_HOTKEY_QUERY 0xc
53
54 static int __init hp_wmi_bios_setup(struct platform_device *device);
55 static int __exit hp_wmi_bios_remove(struct platform_device *device);
56 static int hp_wmi_resume_handler(struct platform_device *device);
57
58 struct bios_args {
59         u32 signature;
60         u32 command;
61         u32 commandtype;
62         u32 datasize;
63         u32 data;
64 };
65
66 struct bios_return {
67         u32 sigpass;
68         u32 return_code;
69         u32 value;
70 };
71
72 struct key_entry {
73         char type;              /* See KE_* below */
74         u16 code;
75         u16 keycode;
76 };
77
78 enum { KE_KEY, KE_END };
79
80 static struct key_entry hp_wmi_keymap[] = {
81         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
82         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
83         {KE_KEY, 0x20e6, KEY_PROG1},
84         {KE_KEY, 0x2142, KEY_MEDIA},
85         {KE_KEY, 0x213b, KEY_INFO},
86         {KE_KEY, 0x231b, KEY_HELP},
87         {KE_END, 0}
88 };
89
90 static struct input_dev *hp_wmi_input_dev;
91 static struct platform_device *hp_wmi_platform_dev;
92
93 static struct rfkill *wifi_rfkill;
94 static struct rfkill *bluetooth_rfkill;
95 static struct rfkill *wwan_rfkill;
96
97 static struct platform_driver hp_wmi_driver = {
98         .driver = {
99                    .name = "hp-wmi",
100                    .owner = THIS_MODULE,
101         },
102         .probe = hp_wmi_bios_setup,
103         .remove = hp_wmi_bios_remove,
104         .resume = hp_wmi_resume_handler,
105 };
106
107 static int hp_wmi_perform_query(int query, int write, int value)
108 {
109         struct bios_return bios_return;
110         acpi_status status;
111         union acpi_object *obj;
112         struct bios_args args = {
113                 .signature = 0x55434553,
114                 .command = write ? 0x2 : 0x1,
115                 .commandtype = query,
116                 .datasize = write ? 0x4 : 0,
117                 .data = value,
118         };
119         struct acpi_buffer input = { sizeof(struct bios_args), &args };
120         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
121
122         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
123
124         obj = output.pointer;
125
126         if (!obj || obj->type != ACPI_TYPE_BUFFER)
127                 return -EINVAL;
128
129         bios_return = *((struct bios_return *)obj->buffer.pointer);
130         if (bios_return.return_code > 0)
131                 return bios_return.return_code * -1;
132         else
133                 return bios_return.value;
134 }
135
136 static int hp_wmi_display_state(void)
137 {
138         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
139 }
140
141 static int hp_wmi_hddtemp_state(void)
142 {
143         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
144 }
145
146 static int hp_wmi_als_state(void)
147 {
148         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
149 }
150
151 static int hp_wmi_dock_state(void)
152 {
153         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
154
155         if (ret < 0)
156                 return ret;
157
158         return ret & 0x1;
159 }
160
161 static int hp_wmi_tablet_state(void)
162 {
163         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
164
165         if (ret < 0)
166                 return ret;
167
168         return (ret & 0x4) ? 1 : 0;
169 }
170
171 static int hp_wmi_set_block(void *data, bool blocked)
172 {
173         unsigned long b = (unsigned long) data;
174         int query = BIT(b + 8) | ((!!blocked) << b);
175
176         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
177 }
178
179 static const struct rfkill_ops hp_wmi_rfkill_ops = {
180         .set_block = hp_wmi_set_block,
181 };
182
183 static bool hp_wmi_wifi_state(void)
184 {
185         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
186
187         if (wireless & 0x100)
188                 return false;
189         else
190                 return true;
191 }
192
193 static bool hp_wmi_bluetooth_state(void)
194 {
195         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
196
197         if (wireless & 0x10000)
198                 return false;
199         else
200                 return true;
201 }
202
203 static bool hp_wmi_wwan_state(void)
204 {
205         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
206
207         if (wireless & 0x1000000)
208                 return false;
209         else
210                 return true;
211 }
212
213 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
214                             char *buf)
215 {
216         int value = hp_wmi_display_state();
217         if (value < 0)
218                 return -EINVAL;
219         return sprintf(buf, "%d\n", value);
220 }
221
222 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
223                             char *buf)
224 {
225         int value = hp_wmi_hddtemp_state();
226         if (value < 0)
227                 return -EINVAL;
228         return sprintf(buf, "%d\n", value);
229 }
230
231 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
232                         char *buf)
233 {
234         int value = hp_wmi_als_state();
235         if (value < 0)
236                 return -EINVAL;
237         return sprintf(buf, "%d\n", value);
238 }
239
240 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
241                          char *buf)
242 {
243         int value = hp_wmi_dock_state();
244         if (value < 0)
245                 return -EINVAL;
246         return sprintf(buf, "%d\n", value);
247 }
248
249 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
250                          char *buf)
251 {
252         int value = hp_wmi_tablet_state();
253         if (value < 0)
254                 return -EINVAL;
255         return sprintf(buf, "%d\n", value);
256 }
257
258 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
259                        const char *buf, size_t count)
260 {
261         u32 tmp = simple_strtoul(buf, NULL, 10);
262         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
263         return count;
264 }
265
266 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
267 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
268 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
269 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
270 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
271
272 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
273 {
274         struct key_entry *key;
275
276         for (key = hp_wmi_keymap; key->type != KE_END; key++)
277                 if (code == key->code)
278                         return key;
279
280         return NULL;
281 }
282
283 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
284 {
285         struct key_entry *key;
286
287         for (key = hp_wmi_keymap; key->type != KE_END; key++)
288                 if (key->type == KE_KEY && keycode == key->keycode)
289                         return key;
290
291         return NULL;
292 }
293
294 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
295 {
296         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
297
298         if (key && key->type == KE_KEY) {
299                 *keycode = key->keycode;
300                 return 0;
301         }
302
303         return -EINVAL;
304 }
305
306 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
307 {
308         struct key_entry *key;
309         int old_keycode;
310
311         if (keycode < 0 || keycode > KEY_MAX)
312                 return -EINVAL;
313
314         key = hp_wmi_get_entry_by_scancode(scancode);
315         if (key && key->type == KE_KEY) {
316                 old_keycode = key->keycode;
317                 key->keycode = keycode;
318                 set_bit(keycode, dev->keybit);
319                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
320                         clear_bit(old_keycode, dev->keybit);
321                 return 0;
322         }
323
324         return -EINVAL;
325 }
326
327 static void hp_wmi_notify(u32 value, void *context)
328 {
329         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
330         static struct key_entry *key;
331         union acpi_object *obj;
332
333         wmi_get_event_data(value, &response);
334
335         obj = (union acpi_object *)response.pointer;
336
337         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
338                 int eventcode = *((u8 *) obj->buffer.pointer);
339                 if (eventcode == 0x4)
340                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
341                                                          0);
342                 key = hp_wmi_get_entry_by_scancode(eventcode);
343                 if (key) {
344                         switch (key->type) {
345                         case KE_KEY:
346                                 input_report_key(hp_wmi_input_dev,
347                                                  key->keycode, 1);
348                                 input_sync(hp_wmi_input_dev);
349                                 input_report_key(hp_wmi_input_dev,
350                                                  key->keycode, 0);
351                                 input_sync(hp_wmi_input_dev);
352                                 break;
353                         }
354                 } else if (eventcode == 0x1) {
355                         input_report_switch(hp_wmi_input_dev, SW_DOCK,
356                                             hp_wmi_dock_state());
357                         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
358                                             hp_wmi_tablet_state());
359                         input_sync(hp_wmi_input_dev);
360                 } else if (eventcode == 0x5) {
361                         if (wifi_rfkill)
362                                 rfkill_set_sw_state(wifi_rfkill,
363                                                     hp_wmi_wifi_state());
364                         if (bluetooth_rfkill)
365                                 rfkill_set_sw_state(bluetooth_rfkill,
366                                                     hp_wmi_bluetooth_state());
367                         if (wwan_rfkill)
368                                 rfkill_set_sw_state(wwan_rfkill,
369                                                     hp_wmi_wwan_state());
370                 } else
371                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
372                                eventcode);
373         } else
374                 printk(KERN_INFO "HP WMI: Unknown response received\n");
375 }
376
377 static int __init hp_wmi_input_setup(void)
378 {
379         struct key_entry *key;
380         int err;
381
382         hp_wmi_input_dev = input_allocate_device();
383
384         hp_wmi_input_dev->name = "HP WMI hotkeys";
385         hp_wmi_input_dev->phys = "wmi/input0";
386         hp_wmi_input_dev->id.bustype = BUS_HOST;
387         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
388         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
389
390         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
391                 switch (key->type) {
392                 case KE_KEY:
393                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
394                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
395                         break;
396                 }
397         }
398
399         set_bit(EV_SW, hp_wmi_input_dev->evbit);
400         set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
401         set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
402
403         /* Set initial hardware state */
404         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
405         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
406                             hp_wmi_tablet_state());
407         input_sync(hp_wmi_input_dev);
408
409         err = input_register_device(hp_wmi_input_dev);
410
411         if (err) {
412                 input_free_device(hp_wmi_input_dev);
413                 return err;
414         }
415
416         return 0;
417 }
418
419 static void cleanup_sysfs(struct platform_device *device)
420 {
421         device_remove_file(&device->dev, &dev_attr_display);
422         device_remove_file(&device->dev, &dev_attr_hddtemp);
423         device_remove_file(&device->dev, &dev_attr_als);
424         device_remove_file(&device->dev, &dev_attr_dock);
425         device_remove_file(&device->dev, &dev_attr_tablet);
426 }
427
428 static int __init hp_wmi_bios_setup(struct platform_device *device)
429 {
430         int err;
431         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
432
433         err = device_create_file(&device->dev, &dev_attr_display);
434         if (err)
435                 goto add_sysfs_error;
436         err = device_create_file(&device->dev, &dev_attr_hddtemp);
437         if (err)
438                 goto add_sysfs_error;
439         err = device_create_file(&device->dev, &dev_attr_als);
440         if (err)
441                 goto add_sysfs_error;
442         err = device_create_file(&device->dev, &dev_attr_dock);
443         if (err)
444                 goto add_sysfs_error;
445         err = device_create_file(&device->dev, &dev_attr_tablet);
446         if (err)
447                 goto add_sysfs_error;
448
449         if (wireless & 0x1) {
450                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
451                                            RFKILL_TYPE_WLAN,
452                                            &hp_wmi_rfkill_ops,
453                                            (void *) 0);
454                 err = rfkill_register(wifi_rfkill);
455                 if (err)
456                         goto register_wifi_error;
457         }
458
459         if (wireless & 0x2) {
460                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
461                                                 RFKILL_TYPE_BLUETOOTH,
462                                                 &hp_wmi_rfkill_ops,
463                                                 (void *) 1);
464                 err = rfkill_register(bluetooth_rfkill);
465                 if (err)
466                         goto register_bluetooth_error;
467         }
468
469         if (wireless & 0x4) {
470                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
471                                            RFKILL_TYPE_WWAN,
472                                            &hp_wmi_rfkill_ops,
473                                            (void *) 2);
474                 err = rfkill_register(wwan_rfkill);
475                 if (err)
476                         goto register_wwan_err;
477         }
478
479         return 0;
480 register_wwan_err:
481         rfkill_destroy(wwan_rfkill);
482         if (bluetooth_rfkill)
483                 rfkill_unregister(bluetooth_rfkill);
484 register_bluetooth_error:
485         rfkill_destroy(bluetooth_rfkill);
486         if (wifi_rfkill)
487                 rfkill_unregister(wifi_rfkill);
488 register_wifi_error:
489         rfkill_destroy(wifi_rfkill);
490 add_sysfs_error:
491         cleanup_sysfs(device);
492         return err;
493 }
494
495 static int __exit hp_wmi_bios_remove(struct platform_device *device)
496 {
497         cleanup_sysfs(device);
498
499         if (wifi_rfkill) {
500                 rfkill_unregister(wifi_rfkill);
501                 rfkill_destroy(wifi_rfkill);
502         }
503         if (bluetooth_rfkill) {
504                 rfkill_unregister(bluetooth_rfkill);
505                 rfkill_destroy(wifi_rfkill);
506         }
507         if (wwan_rfkill) {
508                 rfkill_unregister(wwan_rfkill);
509                 rfkill_destroy(wwan_rfkill);
510         }
511
512         return 0;
513 }
514
515 static int hp_wmi_resume_handler(struct platform_device *device)
516 {
517         /*
518          * Hardware state may have changed while suspended, so trigger
519          * input events for the current state. As this is a switch,
520          * the input layer will only actually pass it on if the state
521          * changed.
522          */
523
524         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
525         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
526                             hp_wmi_tablet_state());
527         input_sync(hp_wmi_input_dev);
528
529         return 0;
530 }
531
532 static int __init hp_wmi_init(void)
533 {
534         int err;
535
536         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
537                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
538                                                  hp_wmi_notify, NULL);
539                 if (!err)
540                         hp_wmi_input_setup();
541         }
542
543         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
544                 err = platform_driver_register(&hp_wmi_driver);
545                 if (err)
546                         return 0;
547                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
548                 if (!hp_wmi_platform_dev) {
549                         platform_driver_unregister(&hp_wmi_driver);
550                         return 0;
551                 }
552                 platform_device_add(hp_wmi_platform_dev);
553         }
554
555         return 0;
556 }
557
558 static void __exit hp_wmi_exit(void)
559 {
560         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
561                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
562                 input_unregister_device(hp_wmi_input_dev);
563         }
564         if (hp_wmi_platform_dev) {
565                 platform_device_del(hp_wmi_platform_dev);
566                 platform_driver_unregister(&hp_wmi_driver);
567         }
568 }
569
570 module_init(hp_wmi_init);
571 module_exit(hp_wmi_exit);