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 enum hp_wmi_radio {
  55         HPWMI_WIFI = 0,
  56         HPWMI_BLUETOOTH = 1,
  57         HPWMI_WWAN = 2,
  58 };
  59
  60 static int __init hp_wmi_bios_setup(struct platform_device *device);
  61 static int __exit hp_wmi_bios_remove(struct platform_device *device);
  62 static int hp_wmi_resume_handler(struct device *device);
  63
  64 struct bios_args {
  65         u32 signature;
  66         u32 command;
  67         u32 commandtype;
  68         u32 datasize;
  69         u32 data;
  70 };
  71
  72 struct bios_return {
  73         u32 sigpass;
  74         u32 return_code;
  75         u32 value;
  76 };
  77
  78 struct key_entry {
  79         char type;              /* See KE_* below */
  80         u16 code;
  81         u16 keycode;
  82 };
  83
  84 enum { KE_KEY, KE_END };
  85
  86 static struct key_entry hp_wmi_keymap[] = {
  87         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
  88         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
  89         {KE_KEY, 0x20e6, KEY_PROG1},
  90         {KE_KEY, 0x2142, KEY_MEDIA},
  91         {KE_KEY, 0x213b, KEY_INFO},
  92         {KE_KEY, 0x231b, KEY_HELP},
  93         {KE_END, 0}
  94 };
  95
  96 static struct input_dev *hp_wmi_input_dev;
  97 static struct platform_device *hp_wmi_platform_dev;
  98
  99 static struct rfkill *wifi_rfkill;
 100 static struct rfkill *bluetooth_rfkill;
 101 static struct rfkill *wwan_rfkill;
 102
 103 static const struct dev_pm_ops hp_wmi_pm_ops = {
 104         .resume  = hp_wmi_resume_handler,
 105         .restore  = hp_wmi_resume_handler,
 106 };
 107
 108 static struct platform_driver hp_wmi_driver = {
 109         .driver = {
 110                 .name = "hp-wmi",
 111                 .owner = THIS_MODULE,
 112                 .pm = &hp_wmi_pm_ops,
 113         },
 114         .probe = hp_wmi_bios_setup,
 115         .remove = hp_wmi_bios_remove,
 116 };
 117
 118 static int hp_wmi_perform_query(int query, int write, int value)
 119 {
 120         struct bios_return bios_return;
 121         acpi_status status;
 122         union acpi_object *obj;
 123         struct bios_args args = {
 124                 .signature = 0x55434553,
 125                 .command = write ? 0x2 : 0x1,
 126                 .commandtype = query,
 127                 .datasize = write ? 0x4 : 0,
 128                 .data = value,
 129         };
 130         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 131         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 132
 133         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 134
 135         obj = output.pointer;
 136
 137         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 138                 return -EINVAL;
 139
 140         bios_return = *((struct bios_return *)obj->buffer.pointer);
 141         if (bios_return.return_code > 0)
 142                 return bios_return.return_code * -1;
 143         else
 144                 return bios_return.value;
 145 }
 146
 147 static int hp_wmi_display_state(void)
 148 {
 149         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 150 }
 151
 152 static int hp_wmi_hddtemp_state(void)
 153 {
 154         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 155 }
 156
 157 static int hp_wmi_als_state(void)
 158 {
 159         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 160 }
 161
 162 static int hp_wmi_dock_state(void)
 163 {
 164         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 165
 166         if (ret < 0)
 167                 return ret;
 168
 169         return ret & 0x1;
 170 }
 171
 172 static int hp_wmi_tablet_state(void)
 173 {
 174         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 175
 176         if (ret < 0)
 177                 return ret;
 178
 179         return (ret & 0x4) ? 1 : 0;
 180 }
 181
 182 static int hp_wmi_set_block(void *data, bool blocked)
 183 {
 184         enum hp_wmi_radio r = (enum hp_wmi_radio) data;
 185         int query = BIT(r + 8) | ((!blocked) << r);
 186
 187         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 188 }
 189
 190 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 191         .set_block = hp_wmi_set_block,
 192 };
 193
 194 static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
 195 {
 196         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 197         int mask = 0x200 << (r * 8);
 198
 199         if (wireless & mask)
 200                 return false;
 201         else
 202                 return true;
 203 }
 204
 205 static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
 206 {
 207         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 208         int mask = 0x800 << (r * 8);
 209
 210         if (wireless & mask)
 211                 return false;
 212         else
 213                 return true;
 214 }
 215
 216 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 217                             char *buf)
 218 {
 219         int value = hp_wmi_display_state();
 220         if (value < 0)
 221                 return -EINVAL;
 222         return sprintf(buf, "%d\n", value);
 223 }
 224
 225 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 226                             char *buf)
 227 {
 228         int value = hp_wmi_hddtemp_state();
 229         if (value < 0)
 230                 return -EINVAL;
 231         return sprintf(buf, "%d\n", value);
 232 }
 233
 234 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 235                         char *buf)
 236 {
 237         int value = hp_wmi_als_state();
 238         if (value < 0)
 239                 return -EINVAL;
 240         return sprintf(buf, "%d\n", value);
 241 }
 242
 243 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 244                          char *buf)
 245 {
 246         int value = hp_wmi_dock_state();
 247         if (value < 0)
 248                 return -EINVAL;
 249         return sprintf(buf, "%d\n", value);
 250 }
 251
 252 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 253                          char *buf)
 254 {
 255         int value = hp_wmi_tablet_state();
 256         if (value < 0)
 257                 return -EINVAL;
 258         return sprintf(buf, "%d\n", value);
 259 }
 260
 261 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 262                        const char *buf, size_t count)
 263 {
 264         u32 tmp = simple_strtoul(buf, NULL, 10);
 265         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 266         return count;
 267 }
 268
 269 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 270 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 271 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 272 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 273 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 274
 275 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 276 {
 277         struct key_entry *key;
 278
 279         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 280                 if (code == key->code)
 281                         return key;
 282
 283         return NULL;
 284 }
 285
 286 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 287 {
 288         struct key_entry *key;
 289
 290         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 291                 if (key->type == KE_KEY && keycode == key->keycode)
 292                         return key;
 293
 294         return NULL;
 295 }
 296
 297 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 298 {
 299         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 300
 301         if (key && key->type == KE_KEY) {
 302                 *keycode = key->keycode;
 303                 return 0;
 304         }
 305
 306         return -EINVAL;
 307 }
 308
 309 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 310 {
 311         struct key_entry *key;
 312         int old_keycode;
 313
 314         if (keycode < 0 || keycode > KEY_MAX)
 315                 return -EINVAL;
 316
 317         key = hp_wmi_get_entry_by_scancode(scancode);
 318         if (key && key->type == KE_KEY) {
 319                 old_keycode = key->keycode;
 320                 key->keycode = keycode;
 321                 set_bit(keycode, dev->keybit);
 322                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 323                         clear_bit(old_keycode, dev->keybit);
 324                 return 0;
 325         }
 326
 327         return -EINVAL;
 328 }
 329
 330 static void hp_wmi_notify(u32 value, void *context)
 331 {
 332         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 333         static struct key_entry *key;
 334         union acpi_object *obj;
 335         int eventcode;
 336
 337         wmi_get_event_data(value, &response);
 338
 339         obj = (union acpi_object *)response.pointer;
 340
 341         if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length != 8) {
 342                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 343                 return;
 344         }
 345
 346         eventcode = *((u8 *) obj->buffer.pointer);
 347         if (eventcode == 0x4)
 348                 eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 349                                                 0);
 350         key = hp_wmi_get_entry_by_scancode(eventcode);
 351         if (key) {
 352                 switch (key->type) {
 353                 case KE_KEY:
 354                         input_report_key(hp_wmi_input_dev,
 355                                          key->keycode, 1);
 356                         input_sync(hp_wmi_input_dev);
 357                         input_report_key(hp_wmi_input_dev,
 358                                          key->keycode, 0);
 359                         input_sync(hp_wmi_input_dev);
 360                         break;
 361                 }
 362         } else if (eventcode == 0x1) {
 363                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 364                                     hp_wmi_dock_state());
 365                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 366                                     hp_wmi_tablet_state());
 367                 input_sync(hp_wmi_input_dev);
 368         } else if (eventcode == 0x5) {
 369                 if (wifi_rfkill)
 370                         rfkill_set_states(wifi_rfkill,
 371                                           hp_wmi_get_sw_state(HPWMI_WIFI),
 372                                           hp_wmi_get_hw_state(HPWMI_WIFI));
 373                 if (bluetooth_rfkill)
 374                         rfkill_set_states(bluetooth_rfkill,
 375                                           hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 376                                           hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 377                 if (wwan_rfkill)
 378                         rfkill_set_states(wwan_rfkill,
 379                                           hp_wmi_get_sw_state(HPWMI_WWAN),
 380                                           hp_wmi_get_hw_state(HPWMI_WWAN));
 381         } else
 382                 printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 383                         eventcode);
 384
 385         kfree(obj);
 386 }
 387
 388 static int __init hp_wmi_input_setup(void)
 389 {
 390         struct key_entry *key;
 391         int err;
 392
 393         hp_wmi_input_dev = input_allocate_device();
 394
 395         hp_wmi_input_dev->name = "HP WMI hotkeys";
 396         hp_wmi_input_dev->phys = "wmi/input0";
 397         hp_wmi_input_dev->id.bustype = BUS_HOST;
 398         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 399         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 400
 401         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 402                 switch (key->type) {
 403                 case KE_KEY:
 404                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 405                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 406                         break;
 407                 }
 408         }
 409
 410         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 411         set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
 412         set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
 413
 414         /* Set initial hardware state */
 415         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 416         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 417                             hp_wmi_tablet_state());
 418         input_sync(hp_wmi_input_dev);
 419
 420         err = input_register_device(hp_wmi_input_dev);
 421
 422         if (err) {
 423                 input_free_device(hp_wmi_input_dev);
 424                 return err;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static void cleanup_sysfs(struct platform_device *device)
 431 {
 432         device_remove_file(&device->dev, &dev_attr_display);
 433         device_remove_file(&device->dev, &dev_attr_hddtemp);
 434         device_remove_file(&device->dev, &dev_attr_als);
 435         device_remove_file(&device->dev, &dev_attr_dock);
 436         device_remove_file(&device->dev, &dev_attr_tablet);
 437 }
 438
 439 static int __init hp_wmi_bios_setup(struct platform_device *device)
 440 {
 441         int err;
 442         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 443
 444         err = device_create_file(&device->dev, &dev_attr_display);
 445         if (err)
 446                 goto add_sysfs_error;
 447         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 448         if (err)
 449                 goto add_sysfs_error;
 450         err = device_create_file(&device->dev, &dev_attr_als);
 451         if (err)
 452                 goto add_sysfs_error;
 453         err = device_create_file(&device->dev, &dev_attr_dock);
 454         if (err)
 455                 goto add_sysfs_error;
 456         err = device_create_file(&device->dev, &dev_attr_tablet);
 457         if (err)
 458                 goto add_sysfs_error;
 459
 460         if (wireless & 0x1) {
 461                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
 462                                            RFKILL_TYPE_WLAN,
 463                                            &hp_wmi_rfkill_ops,
 464                                            (void *) HPWMI_WIFI);
 465                 rfkill_init_sw_state(wifi_rfkill,
 466                                      hp_wmi_get_sw_state(HPWMI_WIFI));
 467                 rfkill_set_hw_state(wifi_rfkill,
 468                                     hp_wmi_get_hw_state(HPWMI_WIFI));
 469                 err = rfkill_register(wifi_rfkill);
 470                 if (err)
 471                         goto register_wifi_error;
 472         }
 473
 474         if (wireless & 0x2) {
 475                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 476                                                 RFKILL_TYPE_BLUETOOTH,
 477                                                 &hp_wmi_rfkill_ops,
 478                                                 (void *) HPWMI_BLUETOOTH);
 479                 rfkill_init_sw_state(bluetooth_rfkill,
 480                                      hp_wmi_get_sw_state(HPWMI_BLUETOOTH));
 481                 rfkill_set_hw_state(bluetooth_rfkill,
 482                                     hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 483                 err = rfkill_register(bluetooth_rfkill);
 484                 if (err)
 485                         goto register_bluetooth_error;
 486         }
 487
 488         if (wireless & 0x4) {
 489                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 490                                            RFKILL_TYPE_WWAN,
 491                                            &hp_wmi_rfkill_ops,
 492                                            (void *) HPWMI_WWAN);
 493                 rfkill_init_sw_state(wwan_rfkill,
 494                                      hp_wmi_get_sw_state(HPWMI_WWAN));
 495                 rfkill_set_hw_state(wwan_rfkill,
 496                                     hp_wmi_get_hw_state(HPWMI_WWAN));
 497                 err = rfkill_register(wwan_rfkill);
 498                 if (err)
 499                         goto register_wwan_err;
 500         }
 501
 502         return 0;
 503 register_wwan_err:
 504         rfkill_destroy(wwan_rfkill);
 505         if (bluetooth_rfkill)
 506                 rfkill_unregister(bluetooth_rfkill);
 507 register_bluetooth_error:
 508         rfkill_destroy(bluetooth_rfkill);
 509         if (wifi_rfkill)
 510                 rfkill_unregister(wifi_rfkill);
 511 register_wifi_error:
 512         rfkill_destroy(wifi_rfkill);
 513 add_sysfs_error:
 514         cleanup_sysfs(device);
 515         return err;
 516 }
 517
 518 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 519 {
 520         cleanup_sysfs(device);
 521
 522         if (wifi_rfkill) {
 523                 rfkill_unregister(wifi_rfkill);
 524                 rfkill_destroy(wifi_rfkill);
 525         }
 526         if (bluetooth_rfkill) {
 527                 rfkill_unregister(bluetooth_rfkill);
 528                 rfkill_destroy(bluetooth_rfkill);
 529         }
 530         if (wwan_rfkill) {
 531                 rfkill_unregister(wwan_rfkill);
 532                 rfkill_destroy(wwan_rfkill);
 533         }
 534
 535         return 0;
 536 }
 537
 538 static int hp_wmi_resume_handler(struct device *device)
 539 {
 540         /*
 541          * Hardware state may have changed while suspended, so trigger
 542          * input events for the current state. As this is a switch,
 543          * the input layer will only actually pass it on if the state
 544          * changed.
 545          */
 546         if (hp_wmi_input_dev) {
 547                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 548                                     hp_wmi_dock_state());
 549                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 550                                     hp_wmi_tablet_state());
 551                 input_sync(hp_wmi_input_dev);
 552         }
 553
 554         if (wifi_rfkill)
 555                 rfkill_set_states(wifi_rfkill,
 556                                   hp_wmi_get_sw_state(HPWMI_WIFI),
 557                                   hp_wmi_get_hw_state(HPWMI_WIFI));
 558         if (bluetooth_rfkill)
 559                 rfkill_set_states(bluetooth_rfkill,
 560                                   hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 561                                   hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 562         if (wwan_rfkill)
 563                 rfkill_set_states(wwan_rfkill,
 564                                   hp_wmi_get_sw_state(HPWMI_WWAN),
 565                                   hp_wmi_get_hw_state(HPWMI_WWAN));
 566
 567         return 0;
 568 }
 569
 570 static int __init hp_wmi_init(void)
 571 {
 572         int err;
 573
 574         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 575                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 576                                                  hp_wmi_notify, NULL);
 577                 if (!err)
 578                         hp_wmi_input_setup();
 579         }
 580
 581         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 582                 err = platform_driver_register(&hp_wmi_driver);
 583                 if (err)
 584                         return 0;
 585                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 586                 if (!hp_wmi_platform_dev) {
 587                         platform_driver_unregister(&hp_wmi_driver);
 588                         return 0;
 589                 }
 590                 platform_device_add(hp_wmi_platform_dev);
 591         }
 592
 593         return 0;
 594 }
 595
 596 static void __exit hp_wmi_exit(void)
 597 {
 598         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 599                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 600                 input_unregister_device(hp_wmi_input_dev);
 601         }
 602         if (hp_wmi_platform_dev) {
 603                 platform_device_del(hp_wmi_platform_dev);
 604                 platform_driver_unregister(&hp_wmi_driver);
 605         }
 606 }
 607
 608 module_init(hp_wmi_init);
 609 module_exit(hp_wmi_exit);