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_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 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_SW, KE_END };
  79
  80 static struct key_entry hp_wmi_keymap[] = {
  81         {KE_SW, 0x01, SW_DOCK},
  82         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
  83         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
  84         {KE_KEY, 0x20e6, KEY_PROG1},
  85         {KE_KEY, 0x2142, KEY_MEDIA},
  86         {KE_KEY, 0x213b, KEY_INFO},
  87         {KE_KEY, 0x231b, KEY_HELP},
  88         {KE_END, 0}
  89 };
  90
  91 static struct input_dev *hp_wmi_input_dev;
  92 static struct platform_device *hp_wmi_platform_dev;
  93
  94 static struct rfkill *wifi_rfkill;
  95 static struct rfkill *bluetooth_rfkill;
  96 static struct rfkill *wwan_rfkill;
  97
  98 static struct platform_driver hp_wmi_driver = {
  99         .driver = {
 100                    .name = "hp-wmi",
 101                    .owner = THIS_MODULE,
 102         },
 103         .probe = hp_wmi_bios_setup,
 104         .remove = hp_wmi_bios_remove,
 105         .resume = hp_wmi_resume_handler,
 106 };
 107
 108 static int hp_wmi_perform_query(int query, int write, int value)
 109 {
 110         struct bios_return bios_return;
 111         acpi_status status;
 112         union acpi_object *obj;
 113         struct bios_args args = {
 114                 .signature = 0x55434553,
 115                 .command = write ? 0x2 : 0x1,
 116                 .commandtype = query,
 117                 .datasize = write ? 0x4 : 0,
 118                 .data = value,
 119         };
 120         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 121         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 122
 123         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 124
 125         obj = output.pointer;
 126
 127         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 128                 return -EINVAL;
 129
 130         bios_return = *((struct bios_return *)obj->buffer.pointer);
 131         if (bios_return.return_code > 0)
 132                 return bios_return.return_code * -1;
 133         else
 134                 return bios_return.value;
 135 }
 136
 137 static int hp_wmi_display_state(void)
 138 {
 139         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 140 }
 141
 142 static int hp_wmi_hddtemp_state(void)
 143 {
 144         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 145 }
 146
 147 static int hp_wmi_als_state(void)
 148 {
 149         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 150 }
 151
 152 static int hp_wmi_dock_state(void)
 153 {
 154         return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
 155 }
 156
 157 static int hp_wmi_wifi_set(void *data, enum rfkill_state state)
 158 {
 159         if (state)
 160                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
 161         else
 162                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
 163 }
 164
 165 static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
 166 {
 167         if (state)
 168                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
 169         else
 170                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
 171 }
 172
 173 static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
 174 {
 175         if (state)
 176                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
 177         else
 178                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
 179 }
 180
 181 static int hp_wmi_wifi_state(void)
 182 {
 183         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 184
 185         if (wireless & 0x100)
 186                 return RFKILL_STATE_UNBLOCKED;
 187         else
 188                 return RFKILL_STATE_SOFT_BLOCKED;
 189 }
 190
 191 static int hp_wmi_bluetooth_state(void)
 192 {
 193         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 194
 195         if (wireless & 0x10000)
 196                 return RFKILL_STATE_UNBLOCKED;
 197         else
 198                 return RFKILL_STATE_SOFT_BLOCKED;
 199 }
 200
 201 static int hp_wmi_wwan_state(void)
 202 {
 203         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 204
 205         if (wireless & 0x1000000)
 206                 return RFKILL_STATE_UNBLOCKED;
 207         else
 208                 return RFKILL_STATE_SOFT_BLOCKED;
 209 }
 210
 211 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 212                             char *buf)
 213 {
 214         int value = hp_wmi_display_state();
 215         if (value < 0)
 216                 return -EINVAL;
 217         return sprintf(buf, "%d\n", value);
 218 }
 219
 220 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 221                             char *buf)
 222 {
 223         int value = hp_wmi_hddtemp_state();
 224         if (value < 0)
 225                 return -EINVAL;
 226         return sprintf(buf, "%d\n", value);
 227 }
 228
 229 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 230                         char *buf)
 231 {
 232         int value = hp_wmi_als_state();
 233         if (value < 0)
 234                 return -EINVAL;
 235         return sprintf(buf, "%d\n", value);
 236 }
 237
 238 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 239                          char *buf)
 240 {
 241         int value = hp_wmi_dock_state();
 242         if (value < 0)
 243                 return -EINVAL;
 244         return sprintf(buf, "%d\n", value);
 245 }
 246
 247 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 248                        const char *buf, size_t count)
 249 {
 250         u32 tmp = simple_strtoul(buf, NULL, 10);
 251         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 252         return count;
 253 }
 254
 255 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 256 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 257 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 258 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 259
 260 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 261 {
 262         struct key_entry *key;
 263
 264         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 265                 if (code == key->code)
 266                         return key;
 267
 268         return NULL;
 269 }
 270
 271 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 272 {
 273         struct key_entry *key;
 274
 275         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 276                 if (key->type == KE_KEY && keycode == key->keycode)
 277                         return key;
 278
 279         return NULL;
 280 }
 281
 282 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 283 {
 284         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 285
 286         if (key && key->type == KE_KEY) {
 287                 *keycode = key->keycode;
 288                 return 0;
 289         }
 290
 291         return -EINVAL;
 292 }
 293
 294 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 295 {
 296         struct key_entry *key;
 297         int old_keycode;
 298
 299         if (keycode < 0 || keycode > KEY_MAX)
 300                 return -EINVAL;
 301
 302         key = hp_wmi_get_entry_by_scancode(scancode);
 303         if (key && key->type == KE_KEY) {
 304                 old_keycode = key->keycode;
 305                 key->keycode = keycode;
 306                 set_bit(keycode, dev->keybit);
 307                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 308                         clear_bit(old_keycode, dev->keybit);
 309                 return 0;
 310         }
 311
 312         return -EINVAL;
 313 }
 314
 315 static void hp_wmi_notify(u32 value, void *context)
 316 {
 317         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 318         static struct key_entry *key;
 319         union acpi_object *obj;
 320
 321         wmi_get_event_data(value, &response);
 322
 323         obj = (union acpi_object *)response.pointer;
 324
 325         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 326                 int eventcode = *((u8 *) obj->buffer.pointer);
 327                 if (eventcode == 0x4)
 328                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 329                                                          0);
 330                 key = hp_wmi_get_entry_by_scancode(eventcode);
 331                 if (key) {
 332                         switch (key->type) {
 333                         case KE_KEY:
 334                                 input_report_key(hp_wmi_input_dev,
 335                                                  key->keycode, 1);
 336                                 input_sync(hp_wmi_input_dev);
 337                                 input_report_key(hp_wmi_input_dev,
 338                                                  key->keycode, 0);
 339                                 input_sync(hp_wmi_input_dev);
 340                                 break;
 341                         case KE_SW:
 342                                 input_report_switch(hp_wmi_input_dev,
 343                                                     key->keycode,
 344                                                     hp_wmi_dock_state());
 345                                 input_sync(hp_wmi_input_dev);
 346                                 break;
 347                         }
 348                 } else if (eventcode == 0x5) {
 349                         if (wifi_rfkill)
 350                                 rfkill_force_state(wifi_rfkill,
 351                                                    hp_wmi_wifi_state());
 352                         if (bluetooth_rfkill)
 353                                 rfkill_force_state(bluetooth_rfkill,
 354                                                    hp_wmi_bluetooth_state());
 355                         if (wwan_rfkill)
 356                                 rfkill_force_state(wwan_rfkill,
 357                                                    hp_wmi_wwan_state());
 358                 } else
 359                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 360                                eventcode);
 361         } else
 362                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 363 }
 364
 365 static int __init hp_wmi_input_setup(void)
 366 {
 367         struct key_entry *key;
 368         int err;
 369
 370         hp_wmi_input_dev = input_allocate_device();
 371
 372         hp_wmi_input_dev->name = "HP WMI hotkeys";
 373         hp_wmi_input_dev->phys = "wmi/input0";
 374         hp_wmi_input_dev->id.bustype = BUS_HOST;
 375         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 376         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 377
 378         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 379                 switch (key->type) {
 380                 case KE_KEY:
 381                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 382                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 383                         break;
 384                 case KE_SW:
 385                         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 386                         set_bit(key->keycode, hp_wmi_input_dev->swbit);
 387
 388                         /* Set initial dock state */
 389                         input_report_switch(hp_wmi_input_dev, key->keycode,
 390                                             hp_wmi_dock_state());
 391                         input_sync(hp_wmi_input_dev);
 392                         break;
 393                 }
 394         }
 395
 396         err = input_register_device(hp_wmi_input_dev);
 397
 398         if (err) {
 399                 input_free_device(hp_wmi_input_dev);
 400                 return err;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static void cleanup_sysfs(struct platform_device *device)
 407 {
 408         device_remove_file(&device->dev, &dev_attr_display);
 409         device_remove_file(&device->dev, &dev_attr_hddtemp);
 410         device_remove_file(&device->dev, &dev_attr_als);
 411         device_remove_file(&device->dev, &dev_attr_dock);
 412 }
 413
 414 static int __init hp_wmi_bios_setup(struct platform_device *device)
 415 {
 416         int err;
 417         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 418
 419         err = device_create_file(&device->dev, &dev_attr_display);
 420         if (err)
 421                 goto add_sysfs_error;
 422         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 423         if (err)
 424                 goto add_sysfs_error;
 425         err = device_create_file(&device->dev, &dev_attr_als);
 426         if (err)
 427                 goto add_sysfs_error;
 428         err = device_create_file(&device->dev, &dev_attr_dock);
 429         if (err)
 430                 goto add_sysfs_error;
 431
 432         if (wireless & 0x1) {
 433                 wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
 434                 wifi_rfkill->name = "hp-wifi";
 435                 wifi_rfkill->state = hp_wmi_wifi_state();
 436                 wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
 437                 wifi_rfkill->user_claim_unsupported = 1;
 438                 err = rfkill_register(wifi_rfkill);
 439                 if (err)
 440                         goto add_sysfs_error;
 441         }
 442
 443         if (wireless & 0x2) {
 444                 bluetooth_rfkill = rfkill_allocate(&device->dev,
 445                                                    RFKILL_TYPE_BLUETOOTH);
 446                 bluetooth_rfkill->name = "hp-bluetooth";
 447                 bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 448                 bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
 449                 bluetooth_rfkill->user_claim_unsupported = 1;
 450                 err = rfkill_register(bluetooth_rfkill);
 451                 if (err)
 452                         goto register_bluetooth_error;
 453         }
 454
 455         if (wireless & 0x4) {
 456                 wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WWAN);
 457                 wwan_rfkill->name = "hp-wwan";
 458                 wwan_rfkill->state = hp_wmi_wwan_state();
 459                 wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
 460                 wwan_rfkill->user_claim_unsupported = 1;
 461                 err = rfkill_register(wwan_rfkill);
 462                 if (err)
 463                         goto register_wwan_err;
 464         }
 465
 466         return 0;
 467 register_wwan_err:
 468         if (bluetooth_rfkill)
 469                 rfkill_unregister(bluetooth_rfkill);
 470 register_bluetooth_error:
 471         if (wifi_rfkill)
 472                 rfkill_unregister(wifi_rfkill);
 473 add_sysfs_error:
 474         cleanup_sysfs(device);
 475         return err;
 476 }
 477
 478 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 479 {
 480         cleanup_sysfs(device);
 481
 482         if (wifi_rfkill)
 483                 rfkill_unregister(wifi_rfkill);
 484         if (bluetooth_rfkill)
 485                 rfkill_unregister(bluetooth_rfkill);
 486         if (wwan_rfkill)
 487                 rfkill_unregister(wwan_rfkill);
 488
 489         return 0;
 490 }
 491
 492 static int hp_wmi_resume_handler(struct platform_device *device)
 493 {
 494         struct key_entry *key;
 495
 496         /*
 497          * Docking state may have changed while suspended, so trigger
 498          * an input event for the current state. As this is a switch,
 499          * the input layer will only actually pass it on if the state
 500          * changed.
 501          */
 502         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 503                 switch (key->type) {
 504                 case KE_SW:
 505                         input_report_switch(hp_wmi_input_dev, key->keycode,
 506                                             hp_wmi_dock_state());
 507                         input_sync(hp_wmi_input_dev);
 508                         break;
 509                 }
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int __init hp_wmi_init(void)
 516 {
 517         int err;
 518
 519         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 520                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 521                                                  hp_wmi_notify, NULL);
 522                 if (!err)
 523                         hp_wmi_input_setup();
 524         }
 525
 526         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 527                 err = platform_driver_register(&hp_wmi_driver);
 528                 if (err)
 529                         return 0;
 530                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 531                 if (!hp_wmi_platform_dev) {
 532                         platform_driver_unregister(&hp_wmi_driver);
 533                         return 0;
 534                 }
 535                 platform_device_add(hp_wmi_platform_dev);
 536         }
 537
 538         return 0;
 539 }
 540
 541 static void __exit hp_wmi_exit(void)
 542 {
 543         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 544                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 545                 input_unregister_device(hp_wmi_input_dev);
 546         }
 547         if (hp_wmi_platform_dev) {
 548                 platform_device_del(hp_wmi_platform_dev);
 549                 platform_driver_unregister(&hp_wmi_driver);
 550         }
 551 }
 552
 553 module_init(hp_wmi_init);
 554 module_exit(hp_wmi_exit);