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);