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_wifi_set(void *data, enum rfkill_state state)
 172 {
 173         if (state)
 174                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
 175         else
 176                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
 177 }
 178
 179 static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
 180 {
 181         if (state)
 182                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
 183         else
 184                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
 185 }
 186
 187 static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
 188 {
 189         if (state)
 190                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
 191         else
 192                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
 193 }
 194
 195 static int hp_wmi_wifi_state(void)
 196 {
 197         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 198
 199         if (wireless & 0x100)
 200                 return RFKILL_STATE_UNBLOCKED;
 201         else
 202                 return RFKILL_STATE_SOFT_BLOCKED;
 203 }
 204
 205 static int hp_wmi_bluetooth_state(void)
 206 {
 207         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 208
 209         if (wireless & 0x10000)
 210                 return RFKILL_STATE_UNBLOCKED;
 211         else
 212                 return RFKILL_STATE_SOFT_BLOCKED;
 213 }
 214
 215 static int hp_wmi_wwan_state(void)
 216 {
 217         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 218
 219         if (wireless & 0x1000000)
 220                 return RFKILL_STATE_UNBLOCKED;
 221         else
 222                 return RFKILL_STATE_SOFT_BLOCKED;
 223 }
 224
 225 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 226                             char *buf)
 227 {
 228         int value = hp_wmi_display_state();
 229         if (value < 0)
 230                 return -EINVAL;
 231         return sprintf(buf, "%d\n", value);
 232 }
 233
 234 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 235                             char *buf)
 236 {
 237         int value = hp_wmi_hddtemp_state();
 238         if (value < 0)
 239                 return -EINVAL;
 240         return sprintf(buf, "%d\n", value);
 241 }
 242
 243 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 244                         char *buf)
 245 {
 246         int value = hp_wmi_als_state();
 247         if (value < 0)
 248                 return -EINVAL;
 249         return sprintf(buf, "%d\n", value);
 250 }
 251
 252 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 253                          char *buf)
 254 {
 255         int value = hp_wmi_dock_state();
 256         if (value < 0)
 257                 return -EINVAL;
 258         return sprintf(buf, "%d\n", value);
 259 }
 260
 261 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 262                          char *buf)
 263 {
 264         int value = hp_wmi_tablet_state();
 265         if (value < 0)
 266                 return -EINVAL;
 267         return sprintf(buf, "%d\n", value);
 268 }
 269
 270 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 271                        const char *buf, size_t count)
 272 {
 273         u32 tmp = simple_strtoul(buf, NULL, 10);
 274         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 275         return count;
 276 }
 277
 278 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 279 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 280 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 281 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 282 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 283
 284 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 285 {
 286         struct key_entry *key;
 287
 288         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 289                 if (code == key->code)
 290                         return key;
 291
 292         return NULL;
 293 }
 294
 295 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 296 {
 297         struct key_entry *key;
 298
 299         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 300                 if (key->type == KE_KEY && keycode == key->keycode)
 301                         return key;
 302
 303         return NULL;
 304 }
 305
 306 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 307 {
 308         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 309
 310         if (key && key->type == KE_KEY) {
 311                 *keycode = key->keycode;
 312                 return 0;
 313         }
 314
 315         return -EINVAL;
 316 }
 317
 318 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 319 {
 320         struct key_entry *key;
 321         int old_keycode;
 322
 323         if (keycode < 0 || keycode > KEY_MAX)
 324                 return -EINVAL;
 325
 326         key = hp_wmi_get_entry_by_scancode(scancode);
 327         if (key && key->type == KE_KEY) {
 328                 old_keycode = key->keycode;
 329                 key->keycode = keycode;
 330                 set_bit(keycode, dev->keybit);
 331                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 332                         clear_bit(old_keycode, dev->keybit);
 333                 return 0;
 334         }
 335
 336         return -EINVAL;
 337 }
 338
 339 static void hp_wmi_notify(u32 value, void *context)
 340 {
 341         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 342         static struct key_entry *key;
 343         union acpi_object *obj;
 344
 345         wmi_get_event_data(value, &response);
 346
 347         obj = (union acpi_object *)response.pointer;
 348
 349         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 350                 int eventcode = *((u8 *) obj->buffer.pointer);
 351                 if (eventcode == 0x4)
 352                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 353                                                          0);
 354                 key = hp_wmi_get_entry_by_scancode(eventcode);
 355                 if (key) {
 356                         switch (key->type) {
 357                         case KE_KEY:
 358                                 input_report_key(hp_wmi_input_dev,
 359                                                  key->keycode, 1);
 360                                 input_sync(hp_wmi_input_dev);
 361                                 input_report_key(hp_wmi_input_dev,
 362                                                  key->keycode, 0);
 363                                 input_sync(hp_wmi_input_dev);
 364                                 break;
 365                         }
 366                 } else if (eventcode == 0x1) {
 367                         input_report_switch(hp_wmi_input_dev, SW_DOCK,
 368                                             hp_wmi_dock_state());
 369                         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 370                                             hp_wmi_tablet_state());
 371                         input_sync(hp_wmi_input_dev);
 372                 } else if (eventcode == 0x5) {
 373                         if (wifi_rfkill)
 374                                 rfkill_force_state(wifi_rfkill,
 375                                                    hp_wmi_wifi_state());
 376                         if (bluetooth_rfkill)
 377                                 rfkill_force_state(bluetooth_rfkill,
 378                                                    hp_wmi_bluetooth_state());
 379                         if (wwan_rfkill)
 380                                 rfkill_force_state(wwan_rfkill,
 381                                                    hp_wmi_wwan_state());
 382                 } else
 383                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 384                                eventcode);
 385         } else
 386                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 387 }
 388
 389 static int __init hp_wmi_input_setup(void)
 390 {
 391         struct key_entry *key;
 392         int err;
 393
 394         hp_wmi_input_dev = input_allocate_device();
 395
 396         hp_wmi_input_dev->name = "HP WMI hotkeys";
 397         hp_wmi_input_dev->phys = "wmi/input0";
 398         hp_wmi_input_dev->id.bustype = BUS_HOST;
 399         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 400         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 401
 402         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 403                 switch (key->type) {
 404                 case KE_KEY:
 405                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 406                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 407                         break;
 408                 }
 409         }
 410
 411         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 412         set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
 413         set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
 414
 415         /* Set initial hardware state */
 416         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 417         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 418                             hp_wmi_tablet_state());
 419         input_sync(hp_wmi_input_dev);
 420
 421         err = input_register_device(hp_wmi_input_dev);
 422
 423         if (err) {
 424                 input_free_device(hp_wmi_input_dev);
 425                 return err;
 426         }
 427
 428         return 0;
 429 }
 430
 431 static void cleanup_sysfs(struct platform_device *device)
 432 {
 433         device_remove_file(&device->dev, &dev_attr_display);
 434         device_remove_file(&device->dev, &dev_attr_hddtemp);
 435         device_remove_file(&device->dev, &dev_attr_als);
 436         device_remove_file(&device->dev, &dev_attr_dock);
 437         device_remove_file(&device->dev, &dev_attr_tablet);
 438 }
 439
 440 static int __init hp_wmi_bios_setup(struct platform_device *device)
 441 {
 442         int err;
 443         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 444
 445         err = device_create_file(&device->dev, &dev_attr_display);
 446         if (err)
 447                 goto add_sysfs_error;
 448         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 449         if (err)
 450                 goto add_sysfs_error;
 451         err = device_create_file(&device->dev, &dev_attr_als);
 452         if (err)
 453                 goto add_sysfs_error;
 454         err = device_create_file(&device->dev, &dev_attr_dock);
 455         if (err)
 456                 goto add_sysfs_error;
 457         err = device_create_file(&device->dev, &dev_attr_tablet);
 458         if (err)
 459                 goto add_sysfs_error;
 460
 461         if (wireless & 0x1) {
 462                 wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
 463                 wifi_rfkill->name = "hp-wifi";
 464                 wifi_rfkill->state = hp_wmi_wifi_state();
 465                 wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
 466                 wifi_rfkill->user_claim_unsupported = 1;
 467                 err = rfkill_register(wifi_rfkill);
 468                 if (err)
 469                         goto add_sysfs_error;
 470         }
 471
 472         if (wireless & 0x2) {
 473                 bluetooth_rfkill = rfkill_allocate(&device->dev,
 474                                                    RFKILL_TYPE_BLUETOOTH);
 475                 bluetooth_rfkill->name = "hp-bluetooth";
 476                 bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 477                 bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
 478                 bluetooth_rfkill->user_claim_unsupported = 1;
 479                 err = rfkill_register(bluetooth_rfkill);
 480                 if (err)
 481                         goto register_bluetooth_error;
 482         }
 483
 484         if (wireless & 0x4) {
 485                 wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WWAN);
 486                 wwan_rfkill->name = "hp-wwan";
 487                 wwan_rfkill->state = hp_wmi_wwan_state();
 488                 wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
 489                 wwan_rfkill->user_claim_unsupported = 1;
 490                 err = rfkill_register(wwan_rfkill);
 491                 if (err)
 492                         goto register_wwan_err;
 493         }
 494
 495         return 0;
 496 register_wwan_err:
 497         if (bluetooth_rfkill)
 498                 rfkill_unregister(bluetooth_rfkill);
 499 register_bluetooth_error:
 500         if (wifi_rfkill)
 501                 rfkill_unregister(wifi_rfkill);
 502 add_sysfs_error:
 503         cleanup_sysfs(device);
 504         return err;
 505 }
 506
 507 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 508 {
 509         cleanup_sysfs(device);
 510
 511         if (wifi_rfkill)
 512                 rfkill_unregister(wifi_rfkill);
 513         if (bluetooth_rfkill)
 514                 rfkill_unregister(bluetooth_rfkill);
 515         if (wwan_rfkill)
 516                 rfkill_unregister(wwan_rfkill);
 517
 518         return 0;
 519 }
 520
 521 static int hp_wmi_resume_handler(struct platform_device *device)
 522 {
 523         /*
 524          * Hardware state may have changed while suspended, so trigger
 525          * input events for the current state. As this is a switch,
 526          * the input layer will only actually pass it on if the state
 527          * changed.
 528          */
 529
 530         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 531         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 532                             hp_wmi_tablet_state());
 533         input_sync(hp_wmi_input_dev);
 534
 535         return 0;
 536 }
 537
 538 static int __init hp_wmi_init(void)
 539 {
 540         int err;
 541
 542         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 543                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 544                                                  hp_wmi_notify, NULL);
 545                 if (!err)
 546                         hp_wmi_input_setup();
 547         }
 548
 549         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 550                 err = platform_driver_register(&hp_wmi_driver);
 551                 if (err)
 552                         return 0;
 553                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 554                 if (!hp_wmi_platform_dev) {
 555                         platform_driver_unregister(&hp_wmi_driver);
 556                         return 0;
 557                 }
 558                 platform_device_add(hp_wmi_platform_dev);
 559         }
 560
 561         return 0;
 562 }
 563
 564 static void __exit hp_wmi_exit(void)
 565 {
 566         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 567                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 568                 input_unregister_device(hp_wmi_input_dev);
 569         }
 570         if (hp_wmi_platform_dev) {
 571                 platform_device_del(hp_wmi_platform_dev);
 572                 platform_driver_unregister(&hp_wmi_driver);
 573         }
 574 }
 575
 576 module_init(hp_wmi_init);
 577 module_exit(hp_wmi_exit);