drivers/platform/x86/ideapad-laptop.c

   1 /*
   2  *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
   3  *
   4  *  Copyright © 2010 Intel Corporation
   5  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  *  02110-1301, USA.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <acpi/acpi_bus.h>
  30 #include <acpi/acpi_drivers.h>
  31 #include <linux/rfkill.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/input.h>
  34 #include <linux/input/sparse-keymap.h>
  35 #include <linux/backlight.h>
  36 #include <linux/fb.h>
  37
  38 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  39
  40 #define CFG_BT_BIT      (16)
  41 #define CFG_3G_BIT      (17)
  42 #define CFG_WIFI_BIT    (18)
  43 #define CFG_CAMERA_BIT  (19)
  44
  45 struct ideapad_private {
  46         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  47         struct platform_device *platform_device;
  48         struct input_dev *inputdev;
  49         struct backlight_device *blightdev;
  50         unsigned long cfg;
  51 };
  52
  53 static acpi_handle ideapad_handle;
  54 static bool no_bt_rfkill;
  55 module_param(no_bt_rfkill, bool, 0444);
  56 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  57
  58 /*
  59  * ACPI Helpers
  60  */
  61 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  62
  63 static int read_method_int(acpi_handle handle, const char *method, int *val)
  64 {
  65         acpi_status status;
  66         unsigned long long result;
  67
  68         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  69         if (ACPI_FAILURE(status)) {
  70                 *val = -1;
  71                 return -1;
  72         } else {
  73                 *val = result;
  74                 return 0;
  75         }
  76 }
  77
  78 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
  79 {
  80         acpi_status status;
  81         unsigned long long result;
  82         struct acpi_object_list params;
  83         union acpi_object in_obj;
  84
  85         params.count = 1;
  86         params.pointer = &in_obj;
  87         in_obj.type = ACPI_TYPE_INTEGER;
  88         in_obj.integer.value = cmd;
  89
  90         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
  91
  92         if (ACPI_FAILURE(status)) {
  93                 *ret = -1;
  94                 return -1;
  95         } else {
  96                 *ret = result;
  97                 return 0;
  98         }
  99 }
 100
 101 static int method_vpcw(acpi_handle handle, int cmd, int data)
 102 {
 103         struct acpi_object_list params;
 104         union acpi_object in_obj[2];
 105         acpi_status status;
 106
 107         params.count = 2;
 108         params.pointer = in_obj;
 109         in_obj[0].type = ACPI_TYPE_INTEGER;
 110         in_obj[0].integer.value = cmd;
 111         in_obj[1].type = ACPI_TYPE_INTEGER;
 112         in_obj[1].integer.value = data;
 113
 114         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 115         if (status != AE_OK)
 116                 return -1;
 117         return 0;
 118 }
 119
 120 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 121 {
 122         int val;
 123         unsigned long int end_jiffies;
 124
 125         if (method_vpcw(handle, 1, cmd))
 126                 return -1;
 127
 128         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 129              time_before(jiffies, end_jiffies);) {
 130                 schedule();
 131                 if (method_vpcr(handle, 1, &val))
 132                         return -1;
 133                 if (val == 0) {
 134                         if (method_vpcr(handle, 0, &val))
 135                                 return -1;
 136                         *data = val;
 137                         return 0;
 138                 }
 139         }
 140         pr_err("timeout in read_ec_cmd\n");
 141         return -1;
 142 }
 143
 144 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 145 {
 146         int val;
 147         unsigned long int end_jiffies;
 148
 149         if (method_vpcw(handle, 0, data))
 150                 return -1;
 151         if (method_vpcw(handle, 1, cmd))
 152                 return -1;
 153
 154         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 155              time_before(jiffies, end_jiffies);) {
 156                 schedule();
 157                 if (method_vpcr(handle, 1, &val))
 158                         return -1;
 159                 if (val == 0)
 160                         return 0;
 161         }
 162         pr_err("timeout in write_ec_cmd\n");
 163         return -1;
 164 }
 165
 166 /*
 167  * sysfs
 168  */
 169 static ssize_t show_ideapad_cam(struct device *dev,
 170                                 struct device_attribute *attr,
 171                                 char *buf)
 172 {
 173         unsigned long result;
 174
 175         if (read_ec_data(ideapad_handle, 0x1D, &result))
 176                 return sprintf(buf, "-1\n");
 177         return sprintf(buf, "%lu\n", result);
 178 }
 179
 180 static ssize_t store_ideapad_cam(struct device *dev,
 181                                  struct device_attribute *attr,
 182                                  const char *buf, size_t count)
 183 {
 184         int ret, state;
 185
 186         if (!count)
 187                 return 0;
 188         if (sscanf(buf, "%i", &state) != 1)
 189                 return -EINVAL;
 190         ret = write_ec_cmd(ideapad_handle, 0x1E, state);
 191         if (ret < 0)
 192                 return ret;
 193         return count;
 194 }
 195
 196 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 197
 198 static ssize_t show_ideapad_cfg(struct device *dev,
 199                                 struct device_attribute *attr,
 200                                 char *buf)
 201 {
 202         struct ideapad_private *priv = dev_get_drvdata(dev);
 203
 204         return sprintf(buf, "0x%.8lX\n", priv->cfg);
 205 }
 206
 207 static DEVICE_ATTR(cfg, 0444, show_ideapad_cfg, NULL);
 208
 209 static struct attribute *ideapad_attributes[] = {
 210         &dev_attr_camera_power.attr,
 211         &dev_attr_cfg.attr,
 212         NULL
 213 };
 214
 215 static mode_t ideapad_is_visible(struct kobject *kobj,
 216                                  struct attribute *attr,
 217                                  int idx)
 218 {
 219         struct device *dev = container_of(kobj, struct device, kobj);
 220         struct ideapad_private *priv = dev_get_drvdata(dev);
 221         bool supported;
 222
 223         if (attr == &dev_attr_camera_power.attr)
 224                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
 225         else
 226                 supported = true;
 227
 228         return supported ? attr->mode : 0;
 229 }
 230
 231 static struct attribute_group ideapad_attribute_group = {
 232         .is_visible = ideapad_is_visible,
 233         .attrs = ideapad_attributes
 234 };
 235
 236 /*
 237  * Rfkill
 238  */
 239 struct ideapad_rfk_data {
 240         char *name;
 241         int cfgbit;
 242         int opcode;
 243         int type;
 244 };
 245
 246 const struct ideapad_rfk_data ideapad_rfk_data[] = {
 247         { "ideapad_wlan",      CFG_WIFI_BIT, 0x15, RFKILL_TYPE_WLAN },
 248         { "ideapad_bluetooth", CFG_BT_BIT,   0x17, RFKILL_TYPE_BLUETOOTH },
 249         { "ideapad_3g",        CFG_3G_BIT,   0x20, RFKILL_TYPE_WWAN },
 250 };
 251
 252 static int ideapad_rfk_set(void *data, bool blocked)
 253 {
 254         unsigned long opcode = (unsigned long)data;
 255
 256         return write_ec_cmd(ideapad_handle, opcode, !blocked);
 257 }
 258
 259 static struct rfkill_ops ideapad_rfk_ops = {
 260         .set_block = ideapad_rfk_set,
 261 };
 262
 263 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 264 {
 265         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 266         unsigned long hw_blocked;
 267         int i;
 268
 269         if (read_ec_data(ideapad_handle, 0x23, &hw_blocked))
 270                 return;
 271         hw_blocked = !hw_blocked;
 272
 273         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 274                 if (priv->rfk[i])
 275                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 276 }
 277
 278 static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
 279                                              int dev)
 280 {
 281         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 282         int ret;
 283         unsigned long sw_blocked;
 284
 285         if (no_bt_rfkill &&
 286             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 287                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 288                 write_ec_cmd(ideapad_handle,
 289                              ideapad_rfk_data[dev].opcode, 1);
 290                 return 0;
 291         }
 292
 293         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 294                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 295                                       (void *)(long)dev);
 296         if (!priv->rfk[dev])
 297                 return -ENOMEM;
 298
 299         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
 300                          &sw_blocked)) {
 301                 rfkill_init_sw_state(priv->rfk[dev], 0);
 302         } else {
 303                 sw_blocked = !sw_blocked;
 304                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 305         }
 306
 307         ret = rfkill_register(priv->rfk[dev]);
 308         if (ret) {
 309                 rfkill_destroy(priv->rfk[dev]);
 310                 return ret;
 311         }
 312         return 0;
 313 }
 314
 315 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 316 {
 317         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 318
 319         if (!priv->rfk[dev])
 320                 return;
 321
 322         rfkill_unregister(priv->rfk[dev]);
 323         rfkill_destroy(priv->rfk[dev]);
 324 }
 325
 326 /*
 327  * Platform device
 328  */
 329 static int __devinit ideapad_platform_init(struct ideapad_private *priv)
 330 {
 331         int result;
 332
 333         priv->platform_device = platform_device_alloc("ideapad", -1);
 334         if (!priv->platform_device)
 335                 return -ENOMEM;
 336         platform_set_drvdata(priv->platform_device, priv);
 337
 338         result = platform_device_add(priv->platform_device);
 339         if (result)
 340                 goto fail_platform_device;
 341
 342         result = sysfs_create_group(&priv->platform_device->dev.kobj,
 343                                     &ideapad_attribute_group);
 344         if (result)
 345                 goto fail_sysfs;
 346         return 0;
 347
 348 fail_sysfs:
 349         platform_device_del(priv->platform_device);
 350 fail_platform_device:
 351         platform_device_put(priv->platform_device);
 352         return result;
 353 }
 354
 355 static void ideapad_platform_exit(struct ideapad_private *priv)
 356 {
 357         sysfs_remove_group(&priv->platform_device->dev.kobj,
 358                            &ideapad_attribute_group);
 359         platform_device_unregister(priv->platform_device);
 360 }
 361
 362 /*
 363  * input device
 364  */
 365 static const struct key_entry ideapad_keymap[] = {
 366         { KE_KEY, 0x06, { KEY_SWITCHVIDEOMODE } },
 367         { KE_KEY, 0x0D, { KEY_WLAN } },
 368         { KE_END, 0 },
 369 };
 370
 371 static int __devinit ideapad_input_init(struct ideapad_private *priv)
 372 {
 373         struct input_dev *inputdev;
 374         int error;
 375
 376         inputdev = input_allocate_device();
 377         if (!inputdev) {
 378                 pr_info("Unable to allocate input device\n");
 379                 return -ENOMEM;
 380         }
 381
 382         inputdev->name = "Ideapad extra buttons";
 383         inputdev->phys = "ideapad/input0";
 384         inputdev->id.bustype = BUS_HOST;
 385         inputdev->dev.parent = &priv->platform_device->dev;
 386
 387         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 388         if (error) {
 389                 pr_err("Unable to setup input device keymap\n");
 390                 goto err_free_dev;
 391         }
 392
 393         error = input_register_device(inputdev);
 394         if (error) {
 395                 pr_err("Unable to register input device\n");
 396                 goto err_free_keymap;
 397         }
 398
 399         priv->inputdev = inputdev;
 400         return 0;
 401
 402 err_free_keymap:
 403         sparse_keymap_free(inputdev);
 404 err_free_dev:
 405         input_free_device(inputdev);
 406         return error;
 407 }
 408
 409 static void ideapad_input_exit(struct ideapad_private *priv)
 410 {
 411         sparse_keymap_free(priv->inputdev);
 412         input_unregister_device(priv->inputdev);
 413         priv->inputdev = NULL;
 414 }
 415
 416 static void ideapad_input_report(struct ideapad_private *priv,
 417                                  unsigned long scancode)
 418 {
 419         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 420 }
 421
 422 /*
 423  * backlight
 424  */
 425 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
 426 {
 427         unsigned long now;
 428
 429         if (read_ec_data(ideapad_handle, 0x12, &now))
 430                 return -EIO;
 431         return now;
 432 }
 433
 434 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
 435 {
 436         if (write_ec_cmd(ideapad_handle, 0x13, blightdev->props.brightness))
 437                 return -EIO;
 438         if (write_ec_cmd(ideapad_handle, 0x33,
 439                          blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
 440                 return -EIO;
 441
 442         return 0;
 443 }
 444
 445 static const struct backlight_ops ideapad_backlight_ops = {
 446         .get_brightness = ideapad_backlight_get_brightness,
 447         .update_status = ideapad_backlight_update_status,
 448 };
 449
 450 static int ideapad_backlight_init(struct ideapad_private *priv)
 451 {
 452         struct backlight_device *blightdev;
 453         struct backlight_properties props;
 454         unsigned long max, now, power;
 455
 456         if (read_ec_data(ideapad_handle, 0x11, &max))
 457                 return -EIO;
 458         if (read_ec_data(ideapad_handle, 0x12, &now))
 459                 return -EIO;
 460         if (read_ec_data(ideapad_handle, 0x18, &power))
 461                 return -EIO;
 462
 463         memset(&props, 0, sizeof(struct backlight_properties));
 464         props.max_brightness = max;
 465         props.type = BACKLIGHT_PLATFORM;
 466         blightdev = backlight_device_register("ideapad",
 467                                               &priv->platform_device->dev,
 468                                               priv,
 469                                               &ideapad_backlight_ops,
 470                                               &props);
 471         if (IS_ERR(blightdev)) {
 472                 pr_err("Could not register backlight device\n");
 473                 return PTR_ERR(blightdev);
 474         }
 475
 476         priv->blightdev = blightdev;
 477         blightdev->props.brightness = now;
 478         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 479         backlight_update_status(blightdev);
 480
 481         return 0;
 482 }
 483
 484 static void ideapad_backlight_exit(struct ideapad_private *priv)
 485 {
 486         if (priv->blightdev)
 487                 backlight_device_unregister(priv->blightdev);
 488         priv->blightdev = NULL;
 489 }
 490
 491 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
 492 {
 493         unsigned long power;
 494         struct backlight_device *blightdev = priv->blightdev;
 495
 496         if (read_ec_data(ideapad_handle, 0x18, &power))
 497                 return;
 498         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 499 }
 500
 501 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
 502 {
 503         unsigned long now;
 504
 505         /* if we control brightness via acpi video driver */
 506         if (priv->blightdev == NULL) {
 507                 read_ec_data(ideapad_handle, 0x12, &now);
 508                 return;
 509         }
 510
 511         backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
 512 }
 513
 514 /*
 515  * module init/exit
 516  */
 517 static const struct acpi_device_id ideapad_device_ids[] = {
 518         { "VPC2004", 0},
 519         { "", 0},
 520 };
 521 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 522
 523 static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
 524 {
 525         int ret, i;
 526         unsigned long cfg;
 527         struct ideapad_private *priv;
 528
 529         if (read_method_int(adevice->handle, "_CFG", (int *)&cfg))
 530                 return -ENODEV;
 531
 532         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 533         if (!priv)
 534                 return -ENOMEM;
 535         dev_set_drvdata(&adevice->dev, priv);
 536         ideapad_handle = adevice->handle;
 537         priv->cfg = cfg;
 538
 539         ret = ideapad_platform_init(priv);
 540         if (ret)
 541                 goto platform_failed;
 542
 543         ret = ideapad_input_init(priv);
 544         if (ret)
 545                 goto input_failed;
 546
 547         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
 548                 if (test_bit(ideapad_rfk_data[i].cfgbit, &cfg))
 549                         ideapad_register_rfkill(adevice, i);
 550                 else
 551                         priv->rfk[i] = NULL;
 552         }
 553         ideapad_sync_rfk_state(adevice);
 554
 555         if (!acpi_video_backlight_support()) {
 556                 ret = ideapad_backlight_init(priv);
 557                 if (ret && ret != -ENODEV)
 558                         goto backlight_failed;
 559         }
 560
 561         return 0;
 562
 563 backlight_failed:
 564         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 565                 ideapad_unregister_rfkill(adevice, i);
 566         ideapad_input_exit(priv);
 567 input_failed:
 568         ideapad_platform_exit(priv);
 569 platform_failed:
 570         kfree(priv);
 571         return ret;
 572 }
 573
 574 static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
 575 {
 576         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 577         int i;
 578
 579         ideapad_backlight_exit(priv);
 580         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 581                 ideapad_unregister_rfkill(adevice, i);
 582         ideapad_input_exit(priv);
 583         ideapad_platform_exit(priv);
 584         dev_set_drvdata(&adevice->dev, NULL);
 585         kfree(priv);
 586
 587         return 0;
 588 }
 589
 590 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 591 {
 592         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 593         acpi_handle handle = adevice->handle;
 594         unsigned long vpc1, vpc2, vpc_bit;
 595
 596         if (read_ec_data(handle, 0x10, &vpc1))
 597                 return;
 598         if (read_ec_data(handle, 0x1A, &vpc2))
 599                 return;
 600
 601         vpc1 = (vpc2 << 8) | vpc1;
 602         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 603                 if (test_bit(vpc_bit, &vpc1)) {
 604                         switch (vpc_bit) {
 605                         case 9:
 606                                 ideapad_sync_rfk_state(adevice);
 607                                 break;
 608                         case 4:
 609                                 ideapad_backlight_notify_brightness(priv);
 610                                 break;
 611                         case 2:
 612                                 ideapad_backlight_notify_power(priv);
 613                                 break;
 614                         default:
 615                                 ideapad_input_report(priv, vpc_bit);
 616                         }
 617                 }
 618         }
 619 }
 620
 621 static struct acpi_driver ideapad_acpi_driver = {
 622         .name = "ideapad_acpi",
 623         .class = "IdeaPad",
 624         .ids = ideapad_device_ids,
 625         .ops.add = ideapad_acpi_add,
 626         .ops.remove = ideapad_acpi_remove,
 627         .ops.notify = ideapad_acpi_notify,
 628         .owner = THIS_MODULE,
 629 };
 630
 631 static int __init ideapad_acpi_module_init(void)
 632 {
 633         return acpi_bus_register_driver(&ideapad_acpi_driver);
 634 }
 635
 636 static void __exit ideapad_acpi_module_exit(void)
 637 {
 638         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 639 }
 640
 641 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 642 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 643 MODULE_LICENSE("GPL");
 644
 645 module_init(ideapad_acpi_module_init);
 646 module_exit(ideapad_acpi_module_exit);