drivers/misc/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_DOCK_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
  57 struct bios_args {
  58         u32 signature;
  59         u32 command;
  60         u32 commandtype;
  61         u32 datasize;
  62         u32 data;
  63 };
  64
  65 struct bios_return {
  66         u32 sigpass;
  67         u32 return_code;
  68         u32 value;
  69 };
  70
  71 struct key_entry {
  72         char type;              /* See KE_* below */
  73         u16 code;
  74         u16 keycode;
  75 };
  76
  77 enum { KE_KEY, KE_SW, KE_END };
  78
  79 static struct key_entry hp_wmi_keymap[] = {
  80         {KE_SW, 0x01, SW_DOCK},
  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, 0x231b, KEY_HELP},
  86         {KE_END, 0}
  87 };
  88
  89 static struct input_dev *hp_wmi_input_dev;
  90 static struct platform_device *hp_wmi_platform_dev;
  91
  92 static struct rfkill *wifi_rfkill;
  93 static struct rfkill *bluetooth_rfkill;
  94 static struct rfkill *wwan_rfkill;
  95
  96 static struct platform_driver hp_wmi_driver = {
  97         .driver = {
  98                    .name = "hp-wmi",
  99                    .owner = THIS_MODULE,
 100         },
 101         .probe = hp_wmi_bios_setup,
 102         .remove = hp_wmi_bios_remove,
 103 };
 104
 105 static int hp_wmi_perform_query(int query, int write, int value)
 106 {
 107         struct bios_return bios_return;
 108         acpi_status status;
 109         union acpi_object *obj;
 110         struct bios_args args = {
 111                 .signature = 0x55434553,
 112                 .command = write ? 0x2 : 0x1,
 113                 .commandtype = query,
 114                 .datasize = write ? 0x4 : 0,
 115                 .data = value,
 116         };
 117         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 118         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 119
 120         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 121
 122         obj = output.pointer;
 123
 124         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 125                 return -EINVAL;
 126
 127         bios_return = *((struct bios_return *)obj->buffer.pointer);
 128         if (bios_return.return_code > 0)
 129                 return bios_return.return_code * -1;
 130         else
 131                 return bios_return.value;
 132 }
 133
 134 static int hp_wmi_display_state(void)
 135 {
 136         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 137 }
 138
 139 static int hp_wmi_hddtemp_state(void)
 140 {
 141         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 142 }
 143
 144 static int hp_wmi_als_state(void)
 145 {
 146         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 147 }
 148
 149 static int hp_wmi_dock_state(void)
 150 {
 151         return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
 152 }
 153
 154 static int hp_wmi_wifi_set(void *data, enum rfkill_state state)
 155 {
 156         if (state)
 157                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
 158         else
 159                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
 160 }
 161
 162 static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
 163 {
 164         if (state)
 165                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
 166         else
 167                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
 168 }
 169
 170 static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
 171 {
 172         if (state)
 173                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
 174         else
 175                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
 176 }
 177
 178 static int hp_wmi_wifi_state(void)
 179 {
 180         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 181
 182         if (wireless & 0x100)
 183                 return RFKILL_STATE_UNBLOCKED;
 184         else
 185                 return RFKILL_STATE_SOFT_BLOCKED;
 186 }
 187
 188 static int hp_wmi_bluetooth_state(void)
 189 {
 190         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 191
 192         if (wireless & 0x10000)
 193                 return RFKILL_STATE_UNBLOCKED;
 194         else
 195                 return RFKILL_STATE_SOFT_BLOCKED;
 196 }
 197
 198 static int hp_wmi_wwan_state(void)
 199 {
 200         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 201
 202         if (wireless & 0x1000000)
 203                 return RFKILL_STATE_UNBLOCKED;
 204         else
 205                 return RFKILL_STATE_SOFT_BLOCKED;
 206 }
 207
 208 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 209                             char *buf)
 210 {
 211         int value = hp_wmi_display_state();
 212         if (value < 0)
 213                 return -EINVAL;
 214         return sprintf(buf, "%d\n", value);
 215 }
 216
 217 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 218                             char *buf)
 219 {
 220         int value = hp_wmi_hddtemp_state();
 221         if (value < 0)
 222                 return -EINVAL;
 223         return sprintf(buf, "%d\n", value);
 224 }
 225
 226 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 227                         char *buf)
 228 {
 229         int value = hp_wmi_als_state();
 230         if (value < 0)
 231                 return -EINVAL;
 232         return sprintf(buf, "%d\n", value);
 233 }
 234
 235 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 236                          char *buf)
 237 {
 238         int value = hp_wmi_dock_state();
 239         if (value < 0)
 240                 return -EINVAL;
 241         return sprintf(buf, "%d\n", value);
 242 }
 243
 244 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 245                        const char *buf, size_t count)
 246 {
 247         u32 tmp = simple_strtoul(buf, NULL, 10);
 248         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 249         return count;
 250 }
 251
 252 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 253 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 254 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 255 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 256
 257 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 258 {
 259         struct key_entry *key;
 260
 261         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 262                 if (code == key->code)
 263                         return key;
 264
 265         return NULL;
 266 }
 267
 268 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 269 {
 270         struct key_entry *key;
 271
 272         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 273                 if (key->type == KE_KEY && keycode == key->keycode)
 274                         return key;
 275
 276         return NULL;
 277 }
 278
 279 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 280 {
 281         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 282
 283         if (key && key->type == KE_KEY) {
 284                 *keycode = key->keycode;
 285                 return 0;
 286         }
 287
 288         return -EINVAL;
 289 }
 290
 291 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 292 {
 293         struct key_entry *key;
 294         int old_keycode;
 295
 296         if (keycode < 0 || keycode > KEY_MAX)
 297                 return -EINVAL;
 298
 299         key = hp_wmi_get_entry_by_scancode(scancode);
 300         if (key && key->type == KE_KEY) {
 301                 old_keycode = key->keycode;
 302                 key->keycode = keycode;
 303                 set_bit(keycode, dev->keybit);
 304                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 305                         clear_bit(old_keycode, dev->keybit);
 306                 return 0;
 307         }
 308
 309         return -EINVAL;
 310 }
 311
 312 static void hp_wmi_notify(u32 value, void *context)
 313 {
 314         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 315         static struct key_entry *key;
 316         union acpi_object *obj;
 317
 318         wmi_get_event_data(value, &response);
 319
 320         obj = (union acpi_object *)response.pointer;
 321
 322         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 323                 int eventcode = *((u8 *) obj->buffer.pointer);
 324                 if (eventcode == 0x4)
 325                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 326                                                          0);
 327                 key = hp_wmi_get_entry_by_scancode(eventcode);
 328                 if (key) {
 329                         switch (key->type) {
 330                         case KE_KEY:
 331                                 input_report_key(hp_wmi_input_dev,
 332                                                  key->keycode, 1);
 333                                 input_sync(hp_wmi_input_dev);
 334                                 input_report_key(hp_wmi_input_dev,
 335                                                  key->keycode, 0);
 336                                 input_sync(hp_wmi_input_dev);
 337                                 break;
 338                         case KE_SW:
 339                                 input_report_switch(hp_wmi_input_dev,
 340                                                     key->keycode,
 341                                                     hp_wmi_dock_state());
 342                                 input_sync(hp_wmi_input_dev);
 343                                 break;
 344                         }
 345                 } else if (eventcode == 0x5) {
 346                         if (wifi_rfkill)
 347                                 rfkill_force_state(wifi_rfkill,
 348                                                    hp_wmi_wifi_state());
 349                         if (bluetooth_rfkill)
 350                                 rfkill_force_state(bluetooth_rfkill,
 351                                                    hp_wmi_bluetooth_state());
 352                         if (wwan_rfkill)
 353                                 rfkill_force_state(wwan_rfkill,
 354                                                    hp_wmi_wwan_state());
 355                 } else
 356                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 357                                eventcode);
 358         } else
 359                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 360 }
 361
 362 static int __init hp_wmi_input_setup(void)
 363 {
 364         struct key_entry *key;
 365         int err;
 366
 367         hp_wmi_input_dev = input_allocate_device();
 368
 369         hp_wmi_input_dev->name = "HP WMI hotkeys";
 370         hp_wmi_input_dev->phys = "wmi/input0";
 371         hp_wmi_input_dev->id.bustype = BUS_HOST;
 372         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 373         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 374
 375         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 376                 switch (key->type) {
 377                 case KE_KEY:
 378                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 379                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 380                         break;
 381                 case KE_SW:
 382                         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 383                         set_bit(key->keycode, hp_wmi_input_dev->swbit);
 384                         break;
 385                 }
 386         }
 387
 388         err = input_register_device(hp_wmi_input_dev);
 389
 390         if (err) {
 391                 input_free_device(hp_wmi_input_dev);
 392                 return err;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static void cleanup_sysfs(struct platform_device *device)
 399 {
 400         device_remove_file(&device->dev, &dev_attr_display);
 401         device_remove_file(&device->dev, &dev_attr_hddtemp);
 402         device_remove_file(&device->dev, &dev_attr_als);
 403         device_remove_file(&device->dev, &dev_attr_dock);
 404 }
 405
 406 static int __init hp_wmi_bios_setup(struct platform_device *device)
 407 {
 408         int err;
 409         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 410
 411         err = device_create_file(&device->dev, &dev_attr_display);
 412         if (err)
 413                 goto add_sysfs_error;
 414         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 415         if (err)
 416                 goto add_sysfs_error;
 417         err = device_create_file(&device->dev, &dev_attr_als);
 418         if (err)
 419                 goto add_sysfs_error;
 420         err = device_create_file(&device->dev, &dev_attr_dock);
 421         if (err)
 422                 goto add_sysfs_error;
 423
 424         if (wireless & 0x1) {
 425                 wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
 426                 wifi_rfkill->name = "hp-wifi";
 427                 wifi_rfkill->state = hp_wmi_wifi_state();
 428                 wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
 429                 wifi_rfkill->user_claim_unsupported = 1;
 430                 rfkill_register(wifi_rfkill);
 431         }
 432
 433         if (wireless & 0x2) {
 434                 bluetooth_rfkill = rfkill_allocate(&device->dev,
 435                                                    RFKILL_TYPE_BLUETOOTH);
 436                 bluetooth_rfkill->name = "hp-bluetooth";
 437                 bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 438                 bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
 439                 bluetooth_rfkill->user_claim_unsupported = 1;
 440                 rfkill_register(bluetooth_rfkill);
 441         }
 442
 443         if (wireless & 0x4) {
 444                 wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WWAN);
 445                 wwan_rfkill->name = "hp-wwan";
 446                 wwan_rfkill->state = hp_wmi_wwan_state();
 447                 wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
 448                 wwan_rfkill->user_claim_unsupported = 1;
 449                 rfkill_register(wwan_rfkill);
 450         }
 451
 452         return 0;
 453 add_sysfs_error:
 454         cleanup_sysfs(device);
 455         return err;
 456 }
 457
 458 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 459 {
 460         cleanup_sysfs(device);
 461
 462         if (wifi_rfkill)
 463                 rfkill_unregister(wifi_rfkill);
 464         if (bluetooth_rfkill)
 465                 rfkill_unregister(bluetooth_rfkill);
 466         if (wwan_rfkill)
 467                 rfkill_unregister(wwan_rfkill);
 468
 469         return 0;
 470 }
 471
 472 static int __init hp_wmi_init(void)
 473 {
 474         int err;
 475
 476         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 477                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 478                                                  hp_wmi_notify, NULL);
 479                 if (!err)
 480                         hp_wmi_input_setup();
 481         }
 482
 483         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 484                 err = platform_driver_register(&hp_wmi_driver);
 485                 if (err)
 486                         return 0;
 487                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 488                 if (!hp_wmi_platform_dev) {
 489                         platform_driver_unregister(&hp_wmi_driver);
 490                         return 0;
 491                 }
 492                 platform_device_add(hp_wmi_platform_dev);
 493         }
 494
 495         return 0;
 496 }
 497
 498 static void __exit hp_wmi_exit(void)
 499 {
 500         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 501                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 502                 input_unregister_device(hp_wmi_input_dev);
 503         }
 504         if (hp_wmi_platform_dev) {
 505                 platform_device_del(hp_wmi_platform_dev);
 506                 platform_driver_unregister(&hp_wmi_driver);
 507         }
 508 }
 509
 510 module_init(hp_wmi_init);
 511 module_exit(hp_wmi_exit);