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_set_block(void *data, bool blocked)
 158 {
 159         unsigned long b = (unsigned long) data;
 160         int query = BIT(b + 8) | ((!!blocked) << b);
 161
 162         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 163 }
 164
 165 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 166         .set_block = hp_wmi_set_block,
 167 };
 168
 169 static bool hp_wmi_wifi_state(void)
 170 {
 171         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 172
 173         if (wireless & 0x100)
 174                 return false;
 175         else
 176                 return true;
 177 }
 178
 179 static bool hp_wmi_bluetooth_state(void)
 180 {
 181         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 182
 183         if (wireless & 0x10000)
 184                 return false;
 185         else
 186                 return true;
 187 }
 188
 189 static bool hp_wmi_wwan_state(void)
 190 {
 191         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 192
 193         if (wireless & 0x1000000)
 194                 return false;
 195         else
 196                 return true;
 197 }
 198
 199 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 200                             char *buf)
 201 {
 202         int value = hp_wmi_display_state();
 203         if (value < 0)
 204                 return -EINVAL;
 205         return sprintf(buf, "%d\n", value);
 206 }
 207
 208 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 209                             char *buf)
 210 {
 211         int value = hp_wmi_hddtemp_state();
 212         if (value < 0)
 213                 return -EINVAL;
 214         return sprintf(buf, "%d\n", value);
 215 }
 216
 217 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 218                         char *buf)
 219 {
 220         int value = hp_wmi_als_state();
 221         if (value < 0)
 222                 return -EINVAL;
 223         return sprintf(buf, "%d\n", value);
 224 }
 225
 226 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 227                          char *buf)
 228 {
 229         int value = hp_wmi_dock_state();
 230         if (value < 0)
 231                 return -EINVAL;
 232         return sprintf(buf, "%d\n", value);
 233 }
 234
 235 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 236                        const char *buf, size_t count)
 237 {
 238         u32 tmp = simple_strtoul(buf, NULL, 10);
 239         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 240         return count;
 241 }
 242
 243 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 244 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 245 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 246 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 247
 248 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 249 {
 250         struct key_entry *key;
 251
 252         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 253                 if (code == key->code)
 254                         return key;
 255
 256         return NULL;
 257 }
 258
 259 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 260 {
 261         struct key_entry *key;
 262
 263         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 264                 if (key->type == KE_KEY && keycode == key->keycode)
 265                         return key;
 266
 267         return NULL;
 268 }
 269
 270 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 271 {
 272         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 273
 274         if (key && key->type == KE_KEY) {
 275                 *keycode = key->keycode;
 276                 return 0;
 277         }
 278
 279         return -EINVAL;
 280 }
 281
 282 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 283 {
 284         struct key_entry *key;
 285         int old_keycode;
 286
 287         if (keycode < 0 || keycode > KEY_MAX)
 288                 return -EINVAL;
 289
 290         key = hp_wmi_get_entry_by_scancode(scancode);
 291         if (key && key->type == KE_KEY) {
 292                 old_keycode = key->keycode;
 293                 key->keycode = keycode;
 294                 set_bit(keycode, dev->keybit);
 295                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 296                         clear_bit(old_keycode, dev->keybit);
 297                 return 0;
 298         }
 299
 300         return -EINVAL;
 301 }
 302
 303 static void hp_wmi_notify(u32 value, void *context)
 304 {
 305         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 306         static struct key_entry *key;
 307         union acpi_object *obj;
 308
 309         wmi_get_event_data(value, &response);
 310
 311         obj = (union acpi_object *)response.pointer;
 312
 313         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 314                 int eventcode = *((u8 *) obj->buffer.pointer);
 315                 if (eventcode == 0x4)
 316                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 317                                                          0);
 318                 key = hp_wmi_get_entry_by_scancode(eventcode);
 319                 if (key) {
 320                         switch (key->type) {
 321                         case KE_KEY:
 322                                 input_report_key(hp_wmi_input_dev,
 323                                                  key->keycode, 1);
 324                                 input_sync(hp_wmi_input_dev);
 325                                 input_report_key(hp_wmi_input_dev,
 326                                                  key->keycode, 0);
 327                                 input_sync(hp_wmi_input_dev);
 328                                 break;
 329                         case KE_SW:
 330                                 input_report_switch(hp_wmi_input_dev,
 331                                                     key->keycode,
 332                                                     hp_wmi_dock_state());
 333                                 input_sync(hp_wmi_input_dev);
 334                                 break;
 335                         }
 336                 } else if (eventcode == 0x5) {
 337                         if (wifi_rfkill)
 338                                 rfkill_set_sw_state(wifi_rfkill,
 339                                                     hp_wmi_wifi_state());
 340                         if (bluetooth_rfkill)
 341                                 rfkill_set_sw_state(bluetooth_rfkill,
 342                                                     hp_wmi_bluetooth_state());
 343                         if (wwan_rfkill)
 344                                 rfkill_set_sw_state(wwan_rfkill,
 345                                                     hp_wmi_wwan_state());
 346                 } else
 347                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 348                                eventcode);
 349         } else
 350                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 351 }
 352
 353 static int __init hp_wmi_input_setup(void)
 354 {
 355         struct key_entry *key;
 356         int err;
 357
 358         hp_wmi_input_dev = input_allocate_device();
 359
 360         hp_wmi_input_dev->name = "HP WMI hotkeys";
 361         hp_wmi_input_dev->phys = "wmi/input0";
 362         hp_wmi_input_dev->id.bustype = BUS_HOST;
 363         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 364         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 365
 366         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 367                 switch (key->type) {
 368                 case KE_KEY:
 369                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 370                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 371                         break;
 372                 case KE_SW:
 373                         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 374                         set_bit(key->keycode, hp_wmi_input_dev->swbit);
 375
 376                         /* Set initial dock state */
 377                         input_report_switch(hp_wmi_input_dev, key->keycode,
 378                                             hp_wmi_dock_state());
 379                         input_sync(hp_wmi_input_dev);
 380                         break;
 381                 }
 382         }
 383
 384         err = input_register_device(hp_wmi_input_dev);
 385
 386         if (err) {
 387                 input_free_device(hp_wmi_input_dev);
 388                 return err;
 389         }
 390
 391         return 0;
 392 }
 393
 394 static void cleanup_sysfs(struct platform_device *device)
 395 {
 396         device_remove_file(&device->dev, &dev_attr_display);
 397         device_remove_file(&device->dev, &dev_attr_hddtemp);
 398         device_remove_file(&device->dev, &dev_attr_als);
 399         device_remove_file(&device->dev, &dev_attr_dock);
 400 }
 401
 402 static int __init hp_wmi_bios_setup(struct platform_device *device)
 403 {
 404         int err;
 405         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 406
 407         err = device_create_file(&device->dev, &dev_attr_display);
 408         if (err)
 409                 goto add_sysfs_error;
 410         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 411         if (err)
 412                 goto add_sysfs_error;
 413         err = device_create_file(&device->dev, &dev_attr_als);
 414         if (err)
 415                 goto add_sysfs_error;
 416         err = device_create_file(&device->dev, &dev_attr_dock);
 417         if (err)
 418                 goto add_sysfs_error;
 419
 420         if (wireless & 0x1) {
 421                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
 422                                            RFKILL_TYPE_WLAN,
 423                                            &hp_wmi_rfkill_ops,
 424                                            (void *) 0);
 425                 err = rfkill_register(wifi_rfkill);
 426                 if (err)
 427                         goto register_wifi_error;
 428         }
 429
 430         if (wireless & 0x2) {
 431                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 432                                                 RFKILL_TYPE_BLUETOOTH,
 433                                                 &hp_wmi_rfkill_ops,
 434                                                 (void *) 1);
 435                 err = rfkill_register(bluetooth_rfkill);
 436                 if (err)
 437                         goto register_bluetooth_error;
 438         }
 439
 440         if (wireless & 0x4) {
 441                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 442                                            RFKILL_TYPE_WWAN,
 443                                            &hp_wmi_rfkill_ops,
 444                                            (void *) 2);
 445                 err = rfkill_register(wwan_rfkill);
 446                 if (err)
 447                         goto register_wwan_err;
 448         }
 449
 450         return 0;
 451 register_wwan_err:
 452         rfkill_destroy(wwan_rfkill);
 453         if (bluetooth_rfkill)
 454                 rfkill_unregister(bluetooth_rfkill);
 455 register_bluetooth_error:
 456         rfkill_destroy(bluetooth_rfkill);
 457         if (wifi_rfkill)
 458                 rfkill_unregister(wifi_rfkill);
 459 register_wifi_error:
 460         rfkill_destroy(wifi_rfkill);
 461 add_sysfs_error:
 462         cleanup_sysfs(device);
 463         return err;
 464 }
 465
 466 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 467 {
 468         cleanup_sysfs(device);
 469
 470         if (wifi_rfkill) {
 471                 rfkill_unregister(wifi_rfkill);
 472                 rfkill_destroy(wifi_rfkill);
 473         }
 474         if (bluetooth_rfkill) {
 475                 rfkill_unregister(bluetooth_rfkill);
 476                 rfkill_destroy(wifi_rfkill);
 477         }
 478         if (wwan_rfkill) {
 479                 rfkill_unregister(wwan_rfkill);
 480                 rfkill_destroy(wwan_rfkill);
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int hp_wmi_resume_handler(struct platform_device *device)
 487 {
 488         struct key_entry *key;
 489
 490         /*
 491          * Docking state may have changed while suspended, so trigger
 492          * an input event for the current state. As this is a switch,
 493          * the input layer will only actually pass it on if the state
 494          * changed.
 495          */
 496         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 497                 switch (key->type) {
 498                 case KE_SW:
 499                         input_report_switch(hp_wmi_input_dev, key->keycode,
 500                                             hp_wmi_dock_state());
 501                         input_sync(hp_wmi_input_dev);
 502                         break;
 503                 }
 504         }
 505
 506         return 0;
 507 }
 508
 509 static int __init hp_wmi_init(void)
 510 {
 511         int err;
 512
 513         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 514                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 515                                                  hp_wmi_notify, NULL);
 516                 if (!err)
 517                         hp_wmi_input_setup();
 518         }
 519
 520         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 521                 err = platform_driver_register(&hp_wmi_driver);
 522                 if (err)
 523                         return 0;
 524                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 525                 if (!hp_wmi_platform_dev) {
 526                         platform_driver_unregister(&hp_wmi_driver);
 527                         return 0;
 528                 }
 529                 platform_device_add(hp_wmi_platform_dev);
 530         }
 531
 532         return 0;
 533 }
 534
 535 static void __exit hp_wmi_exit(void)
 536 {
 537         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 538                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 539                 input_unregister_device(hp_wmi_input_dev);
 540         }
 541         if (hp_wmi_platform_dev) {
 542                 platform_device_del(hp_wmi_platform_dev);
 543                 platform_driver_unregister(&hp_wmi_driver);
 544         }
 545 }
 546
 547 module_init(hp_wmi_init);
 548 module_exit(hp_wmi_exit);