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 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 dev_pm_ops hp_wmi_pm_ops = {
  98         .resume  = hp_wmi_resume_handler,
  99         .restore  = hp_wmi_resume_handler,
 100 };
 101
 102 static struct platform_driver hp_wmi_driver = {
 103         .driver = {
 104                 .name = "hp-wmi",
 105                 .owner = THIS_MODULE,
 106                 .pm = &hp_wmi_pm_ops,
 107         },
 108         .probe = hp_wmi_bios_setup,
 109         .remove = hp_wmi_bios_remove,
 110 };
 111
 112 static int hp_wmi_perform_query(int query, int write, int value)
 113 {
 114         struct bios_return bios_return;
 115         acpi_status status;
 116         union acpi_object *obj;
 117         struct bios_args args = {
 118                 .signature = 0x55434553,
 119                 .command = write ? 0x2 : 0x1,
 120                 .commandtype = query,
 121                 .datasize = write ? 0x4 : 0,
 122                 .data = value,
 123         };
 124         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 125         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 126
 127         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 128
 129         obj = output.pointer;
 130
 131         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 132                 return -EINVAL;
 133
 134         bios_return = *((struct bios_return *)obj->buffer.pointer);
 135         if (bios_return.return_code > 0)
 136                 return bios_return.return_code * -1;
 137         else
 138                 return bios_return.value;
 139 }
 140
 141 static int hp_wmi_display_state(void)
 142 {
 143         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 144 }
 145
 146 static int hp_wmi_hddtemp_state(void)
 147 {
 148         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 149 }
 150
 151 static int hp_wmi_als_state(void)
 152 {
 153         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 154 }
 155
 156 static int hp_wmi_dock_state(void)
 157 {
 158         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 159
 160         if (ret < 0)
 161                 return ret;
 162
 163         return ret & 0x1;
 164 }
 165
 166 static int hp_wmi_tablet_state(void)
 167 {
 168         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 169
 170         if (ret < 0)
 171                 return ret;
 172
 173         return (ret & 0x4) ? 1 : 0;
 174 }
 175
 176 static int hp_wmi_set_block(void *data, bool blocked)
 177 {
 178         unsigned long b = (unsigned long) data;
 179         int query = BIT(b + 8) | ((!blocked) << b);
 180
 181         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 182 }
 183
 184 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 185         .set_block = hp_wmi_set_block,
 186 };
 187
 188 static bool hp_wmi_wifi_state(void)
 189 {
 190         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 191
 192         if (wireless & 0x100)
 193                 return false;
 194         else
 195                 return true;
 196 }
 197
 198 static bool hp_wmi_bluetooth_state(void)
 199 {
 200         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 201
 202         if (wireless & 0x10000)
 203                 return false;
 204         else
 205                 return true;
 206 }
 207
 208 static bool hp_wmi_wwan_state(void)
 209 {
 210         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 211
 212         if (wireless & 0x1000000)
 213                 return false;
 214         else
 215                 return true;
 216 }
 217
 218 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 219                             char *buf)
 220 {
 221         int value = hp_wmi_display_state();
 222         if (value < 0)
 223                 return -EINVAL;
 224         return sprintf(buf, "%d\n", value);
 225 }
 226
 227 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 228                             char *buf)
 229 {
 230         int value = hp_wmi_hddtemp_state();
 231         if (value < 0)
 232                 return -EINVAL;
 233         return sprintf(buf, "%d\n", value);
 234 }
 235
 236 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 237                         char *buf)
 238 {
 239         int value = hp_wmi_als_state();
 240         if (value < 0)
 241                 return -EINVAL;
 242         return sprintf(buf, "%d\n", value);
 243 }
 244
 245 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 246                          char *buf)
 247 {
 248         int value = hp_wmi_dock_state();
 249         if (value < 0)
 250                 return -EINVAL;
 251         return sprintf(buf, "%d\n", value);
 252 }
 253
 254 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 255                          char *buf)
 256 {
 257         int value = hp_wmi_tablet_state();
 258         if (value < 0)
 259                 return -EINVAL;
 260         return sprintf(buf, "%d\n", value);
 261 }
 262
 263 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 264                        const char *buf, size_t count)
 265 {
 266         u32 tmp = simple_strtoul(buf, NULL, 10);
 267         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 268         return count;
 269 }
 270
 271 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 272 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 273 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 274 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 275 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 276
 277 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 278 {
 279         struct key_entry *key;
 280
 281         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 282                 if (code == key->code)
 283                         return key;
 284
 285         return NULL;
 286 }
 287
 288 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 289 {
 290         struct key_entry *key;
 291
 292         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 293                 if (key->type == KE_KEY && keycode == key->keycode)
 294                         return key;
 295
 296         return NULL;
 297 }
 298
 299 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 300 {
 301         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 302
 303         if (key && key->type == KE_KEY) {
 304                 *keycode = key->keycode;
 305                 return 0;
 306         }
 307
 308         return -EINVAL;
 309 }
 310
 311 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 312 {
 313         struct key_entry *key;
 314         int old_keycode;
 315
 316         if (keycode < 0 || keycode > KEY_MAX)
 317                 return -EINVAL;
 318
 319         key = hp_wmi_get_entry_by_scancode(scancode);
 320         if (key && key->type == KE_KEY) {
 321                 old_keycode = key->keycode;
 322                 key->keycode = keycode;
 323                 set_bit(keycode, dev->keybit);
 324                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 325                         clear_bit(old_keycode, dev->keybit);
 326                 return 0;
 327         }
 328
 329         return -EINVAL;
 330 }
 331
 332 static void hp_wmi_notify(u32 value, void *context)
 333 {
 334         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 335         static struct key_entry *key;
 336         union acpi_object *obj;
 337         acpi_status status;
 338
 339         status = wmi_get_event_data(value, &response);
 340         if (status != AE_OK) {
 341                 printk(KERN_INFO "hp-wmi: bad event status 0x%x\n", status);
 342                 return;
 343         }
 344
 345         obj = (union acpi_object *)response.pointer;
 346
 347         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 348                 int eventcode = *((u8 *) obj->buffer.pointer);
 349                 if (eventcode == 0x4)
 350                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 351                                                          0);
 352                 key = hp_wmi_get_entry_by_scancode(eventcode);
 353                 if (key) {
 354                         switch (key->type) {
 355                         case KE_KEY:
 356                                 input_report_key(hp_wmi_input_dev,
 357                                                  key->keycode, 1);
 358                                 input_sync(hp_wmi_input_dev);
 359                                 input_report_key(hp_wmi_input_dev,
 360                                                  key->keycode, 0);
 361                                 input_sync(hp_wmi_input_dev);
 362                                 break;
 363                         }
 364                 } else if (eventcode == 0x1) {
 365                         input_report_switch(hp_wmi_input_dev, SW_DOCK,
 366                                             hp_wmi_dock_state());
 367                         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 368                                             hp_wmi_tablet_state());
 369                         input_sync(hp_wmi_input_dev);
 370                 } else if (eventcode == 0x5) {
 371                         if (wifi_rfkill)
 372                                 rfkill_set_sw_state(wifi_rfkill,
 373                                                     hp_wmi_wifi_state());
 374                         if (bluetooth_rfkill)
 375                                 rfkill_set_sw_state(bluetooth_rfkill,
 376                                                     hp_wmi_bluetooth_state());
 377                         if (wwan_rfkill)
 378                                 rfkill_set_sw_state(wwan_rfkill,
 379                                                     hp_wmi_wwan_state());
 380                 } else
 381                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 382                                eventcode);
 383         } else
 384                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 385
 386         kfree(obj);
 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_alloc("hp-wifi", &device->dev,
 463                                            RFKILL_TYPE_WLAN,
 464                                            &hp_wmi_rfkill_ops,
 465                                            (void *) 0);
 466                 err = rfkill_register(wifi_rfkill);
 467                 if (err)
 468                         goto register_wifi_error;
 469         }
 470
 471         if (wireless & 0x2) {
 472                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 473                                                 RFKILL_TYPE_BLUETOOTH,
 474                                                 &hp_wmi_rfkill_ops,
 475                                                 (void *) 1);
 476                 err = rfkill_register(bluetooth_rfkill);
 477                 if (err)
 478                         goto register_bluetooth_error;
 479         }
 480
 481         if (wireless & 0x4) {
 482                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 483                                            RFKILL_TYPE_WWAN,
 484                                            &hp_wmi_rfkill_ops,
 485                                            (void *) 2);
 486                 err = rfkill_register(wwan_rfkill);
 487                 if (err)
 488                         goto register_wwan_err;
 489         }
 490
 491         return 0;
 492 register_wwan_err:
 493         rfkill_destroy(wwan_rfkill);
 494         if (bluetooth_rfkill)
 495                 rfkill_unregister(bluetooth_rfkill);
 496 register_bluetooth_error:
 497         rfkill_destroy(bluetooth_rfkill);
 498         if (wifi_rfkill)
 499                 rfkill_unregister(wifi_rfkill);
 500 register_wifi_error:
 501         rfkill_destroy(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                 rfkill_destroy(wifi_rfkill);
 514         }
 515         if (bluetooth_rfkill) {
 516                 rfkill_unregister(bluetooth_rfkill);
 517                 rfkill_destroy(bluetooth_rfkill);
 518         }
 519         if (wwan_rfkill) {
 520                 rfkill_unregister(wwan_rfkill);
 521                 rfkill_destroy(wwan_rfkill);
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int hp_wmi_resume_handler(struct device *device)
 528 {
 529         /*
 530          * Hardware state may have changed while suspended, so trigger
 531          * input events for the current state. As this is a switch,
 532          * the input layer will only actually pass it on if the state
 533          * changed.
 534          */
 535         if (hp_wmi_input_dev) {
 536                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 537                                     hp_wmi_dock_state());
 538                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 539                                     hp_wmi_tablet_state());
 540                 input_sync(hp_wmi_input_dev);
 541         }
 542
 543         return 0;
 544 }
 545
 546 static int __init hp_wmi_init(void)
 547 {
 548         int err;
 549
 550         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 551                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 552                                                  hp_wmi_notify, NULL);
 553                 if (!err)
 554                         hp_wmi_input_setup();
 555         }
 556
 557         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 558                 err = platform_driver_register(&hp_wmi_driver);
 559                 if (err)
 560                         return 0;
 561                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 562                 if (!hp_wmi_platform_dev) {
 563                         platform_driver_unregister(&hp_wmi_driver);
 564                         return 0;
 565                 }
 566                 platform_device_add(hp_wmi_platform_dev);
 567         }
 568
 569         return 0;
 570 }
 571
 572 static void __exit hp_wmi_exit(void)
 573 {
 574         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 575                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 576                 input_unregister_device(hp_wmi_input_dev);
 577         }
 578         if (hp_wmi_platform_dev) {
 579                 platform_device_del(hp_wmi_platform_dev);
 580                 platform_driver_unregister(&hp_wmi_driver);
 581         }
 582 }
 583
 584 module_init(hp_wmi_init);
 585 module_exit(hp_wmi_exit);