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 #include <linux/debugfs.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/i8042.h>
  40
  41 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  42
  43 #define CFG_BT_BIT      (16)
  44 #define CFG_3G_BIT      (17)
  45 #define CFG_WIFI_BIT    (18)
  46 #define CFG_CAMERA_BIT  (19)
  47
  48 enum {
  49         VPCCMD_R_VPC1 = 0x10,
  50         VPCCMD_R_BL_MAX,
  51         VPCCMD_R_BL,
  52         VPCCMD_W_BL,
  53         VPCCMD_R_WIFI,
  54         VPCCMD_W_WIFI,
  55         VPCCMD_R_BT,
  56         VPCCMD_W_BT,
  57         VPCCMD_R_BL_POWER,
  58         VPCCMD_R_NOVO,
  59         VPCCMD_R_VPC2,
  60         VPCCMD_R_TOUCHPAD,
  61         VPCCMD_W_TOUCHPAD,
  62         VPCCMD_R_CAMERA,
  63         VPCCMD_W_CAMERA,
  64         VPCCMD_R_3G,
  65         VPCCMD_W_3G,
  66         VPCCMD_R_ODD, /* 0x21 */
  67         VPCCMD_W_FAN,
  68         VPCCMD_R_RF,
  69         VPCCMD_W_RF,
  70         VPCCMD_R_FAN = 0x2B,
  71         VPCCMD_R_SPECIAL_BUTTONS = 0x31,
  72         VPCCMD_W_BL_POWER = 0x33,
  73 };
  74
  75 struct ideapad_private {
  76         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  77         struct platform_device *platform_device;
  78         struct input_dev *inputdev;
  79         struct backlight_device *blightdev;
  80         struct dentry *debug;
  81         unsigned long cfg;
  82 };
  83
  84 static acpi_handle ideapad_handle;
  85 static struct ideapad_private *ideapad_priv;
  86 static bool no_bt_rfkill;
  87 module_param(no_bt_rfkill, bool, 0444);
  88 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  89
  90 /*
  91  * ACPI Helpers
  92  */
  93 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  94
  95 static int read_method_int(acpi_handle handle, const char *method, int *val)
  96 {
  97         acpi_status status;
  98         unsigned long long result;
  99
 100         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 101         if (ACPI_FAILURE(status)) {
 102                 *val = -1;
 103                 return -1;
 104         } else {
 105                 *val = result;
 106                 return 0;
 107         }
 108 }
 109
 110 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
 111 {
 112         acpi_status status;
 113         unsigned long long result;
 114         struct acpi_object_list params;
 115         union acpi_object in_obj;
 116
 117         params.count = 1;
 118         params.pointer = &in_obj;
 119         in_obj.type = ACPI_TYPE_INTEGER;
 120         in_obj.integer.value = cmd;
 121
 122         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
 123
 124         if (ACPI_FAILURE(status)) {
 125                 *ret = -1;
 126                 return -1;
 127         } else {
 128                 *ret = result;
 129                 return 0;
 130         }
 131 }
 132
 133 static int method_vpcw(acpi_handle handle, int cmd, int data)
 134 {
 135         struct acpi_object_list params;
 136         union acpi_object in_obj[2];
 137         acpi_status status;
 138
 139         params.count = 2;
 140         params.pointer = in_obj;
 141         in_obj[0].type = ACPI_TYPE_INTEGER;
 142         in_obj[0].integer.value = cmd;
 143         in_obj[1].type = ACPI_TYPE_INTEGER;
 144         in_obj[1].integer.value = data;
 145
 146         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 147         if (status != AE_OK)
 148                 return -1;
 149         return 0;
 150 }
 151
 152 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 153 {
 154         int val;
 155         unsigned long int end_jiffies;
 156
 157         if (method_vpcw(handle, 1, cmd))
 158                 return -1;
 159
 160         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 161              time_before(jiffies, end_jiffies);) {
 162                 schedule();
 163                 if (method_vpcr(handle, 1, &val))
 164                         return -1;
 165                 if (val == 0) {
 166                         if (method_vpcr(handle, 0, &val))
 167                                 return -1;
 168                         *data = val;
 169                         return 0;
 170                 }
 171         }
 172         pr_err("timeout in read_ec_cmd\n");
 173         return -1;
 174 }
 175
 176 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 177 {
 178         int val;
 179         unsigned long int end_jiffies;
 180
 181         if (method_vpcw(handle, 0, data))
 182                 return -1;
 183         if (method_vpcw(handle, 1, cmd))
 184                 return -1;
 185
 186         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 187              time_before(jiffies, end_jiffies);) {
 188                 schedule();
 189                 if (method_vpcr(handle, 1, &val))
 190                         return -1;
 191                 if (val == 0)
 192                         return 0;
 193         }
 194         pr_err("timeout in write_ec_cmd\n");
 195         return -1;
 196 }
 197
 198 /*
 199  * debugfs
 200  */
 201 static int debugfs_status_show(struct seq_file *s, void *data)
 202 {
 203         unsigned long value;
 204
 205         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_MAX, &value))
 206                 seq_printf(s, "Backlight max:\t%lu\n", value);
 207         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL, &value))
 208                 seq_printf(s, "Backlight now:\t%lu\n", value);
 209         if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &value))
 210                 seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
 211         seq_printf(s, "=====================\n");
 212
 213         if (!read_ec_data(ideapad_handle, VPCCMD_R_RF, &value))
 214                 seq_printf(s, "Radio status:\t%s(%lu)\n",
 215                            value ? "On" : "Off", value);
 216         if (!read_ec_data(ideapad_handle, VPCCMD_R_WIFI, &value))
 217                 seq_printf(s, "Wifi status:\t%s(%lu)\n",
 218                            value ? "On" : "Off", value);
 219         if (!read_ec_data(ideapad_handle, VPCCMD_R_BT, &value))
 220                 seq_printf(s, "BT status:\t%s(%lu)\n",
 221                            value ? "On" : "Off", value);
 222         if (!read_ec_data(ideapad_handle, VPCCMD_R_3G, &value))
 223                 seq_printf(s, "3G status:\t%s(%lu)\n",
 224                            value ? "On" : "Off", value);
 225         seq_printf(s, "=====================\n");
 226
 227         if (!read_ec_data(ideapad_handle, VPCCMD_R_TOUCHPAD, &value))
 228                 seq_printf(s, "Touchpad status:%s(%lu)\n",
 229                            value ? "On" : "Off", value);
 230         if (!read_ec_data(ideapad_handle, VPCCMD_R_CAMERA, &value))
 231                 seq_printf(s, "Camera status:\t%s(%lu)\n",
 232                            value ? "On" : "Off", value);
 233
 234         return 0;
 235 }
 236
 237 static int debugfs_status_open(struct inode *inode, struct file *file)
 238 {
 239         return single_open(file, debugfs_status_show, NULL);
 240 }
 241
 242 static const struct file_operations debugfs_status_fops = {
 243         .owner = THIS_MODULE,
 244         .open = debugfs_status_open,
 245         .read = seq_read,
 246         .llseek = seq_lseek,
 247         .release = single_release,
 248 };
 249
 250 static int debugfs_cfg_show(struct seq_file *s, void *data)
 251 {
 252         if (!ideapad_priv) {
 253                 seq_printf(s, "cfg: N/A\n");
 254         } else {
 255                 seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
 256                            ideapad_priv->cfg);
 257                 if (test_bit(CFG_BT_BIT, &ideapad_priv->cfg))
 258                         seq_printf(s, "Bluetooth ");
 259                 if (test_bit(CFG_3G_BIT, &ideapad_priv->cfg))
 260                         seq_printf(s, "3G ");
 261                 if (test_bit(CFG_WIFI_BIT, &ideapad_priv->cfg))
 262                         seq_printf(s, "Wireless ");
 263                 if (test_bit(CFG_CAMERA_BIT, &ideapad_priv->cfg))
 264                         seq_printf(s, "Camera ");
 265                 seq_printf(s, "\nGraphic: ");
 266                 switch ((ideapad_priv->cfg)&0x700) {
 267                 case 0x100:
 268                         seq_printf(s, "Intel");
 269                         break;
 270                 case 0x200:
 271                         seq_printf(s, "ATI");
 272                         break;
 273                 case 0x300:
 274                         seq_printf(s, "Nvidia");
 275                         break;
 276                 case 0x400:
 277                         seq_printf(s, "Intel and ATI");
 278                         break;
 279                 case 0x500:
 280                         seq_printf(s, "Intel and Nvidia");
 281                         break;
 282                 }
 283                 seq_printf(s, "\n");
 284         }
 285         return 0;
 286 }
 287
 288 static int debugfs_cfg_open(struct inode *inode, struct file *file)
 289 {
 290         return single_open(file, debugfs_cfg_show, NULL);
 291 }
 292
 293 static const struct file_operations debugfs_cfg_fops = {
 294         .owner = THIS_MODULE,
 295         .open = debugfs_cfg_open,
 296         .read = seq_read,
 297         .llseek = seq_lseek,
 298         .release = single_release,
 299 };
 300
 301 static int ideapad_debugfs_init(struct ideapad_private *priv)
 302 {
 303         struct dentry *node;
 304
 305         priv->debug = debugfs_create_dir("ideapad", NULL);
 306         if (priv->debug == NULL) {
 307                 pr_err("failed to create debugfs directory");
 308                 goto errout;
 309         }
 310
 311         node = debugfs_create_file("cfg", S_IRUGO, priv->debug, NULL,
 312                                    &debugfs_cfg_fops);
 313         if (!node) {
 314                 pr_err("failed to create cfg in debugfs");
 315                 goto errout;
 316         }
 317
 318         node = debugfs_create_file("status", S_IRUGO, priv->debug, NULL,
 319                                    &debugfs_status_fops);
 320         if (!node) {
 321                 pr_err("failed to create status in debugfs");
 322                 goto errout;
 323         }
 324
 325         return 0;
 326
 327 errout:
 328         return -ENOMEM;
 329 }
 330
 331 static void ideapad_debugfs_exit(struct ideapad_private *priv)
 332 {
 333         debugfs_remove_recursive(priv->debug);
 334         priv->debug = NULL;
 335 }
 336
 337 /*
 338  * sysfs
 339  */
 340 static ssize_t show_ideapad_cam(struct device *dev,
 341                                 struct device_attribute *attr,
 342                                 char *buf)
 343 {
 344         unsigned long result;
 345
 346         if (read_ec_data(ideapad_handle, VPCCMD_R_CAMERA, &result))
 347                 return sprintf(buf, "-1\n");
 348         return sprintf(buf, "%lu\n", result);
 349 }
 350
 351 static ssize_t store_ideapad_cam(struct device *dev,
 352                                  struct device_attribute *attr,
 353                                  const char *buf, size_t count)
 354 {
 355         int ret, state;
 356
 357         if (!count)
 358                 return 0;
 359         if (sscanf(buf, "%i", &state) != 1)
 360                 return -EINVAL;
 361         ret = write_ec_cmd(ideapad_handle, VPCCMD_W_CAMERA, state);
 362         if (ret < 0)
 363                 return -EIO;
 364         return count;
 365 }
 366
 367 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 368
 369 static ssize_t show_ideapad_fan(struct device *dev,
 370                                 struct device_attribute *attr,
 371                                 char *buf)
 372 {
 373         unsigned long result;
 374
 375         if (read_ec_data(ideapad_handle, VPCCMD_R_FAN, &result))
 376                 return sprintf(buf, "-1\n");
 377         return sprintf(buf, "%lu\n", result);
 378 }
 379
 380 static ssize_t store_ideapad_fan(struct device *dev,
 381                                  struct device_attribute *attr,
 382                                  const char *buf, size_t count)
 383 {
 384         int ret, state;
 385
 386         if (!count)
 387                 return 0;
 388         if (sscanf(buf, "%i", &state) != 1)
 389                 return -EINVAL;
 390         if (state < 0 || state > 4 || state == 3)
 391                 return -EINVAL;
 392         ret = write_ec_cmd(ideapad_handle, VPCCMD_W_FAN, state);
 393         if (ret < 0)
 394                 return -EIO;
 395         return count;
 396 }
 397
 398 static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
 399
 400 static struct attribute *ideapad_attributes[] = {
 401         &dev_attr_camera_power.attr,
 402         &dev_attr_fan_mode.attr,
 403         NULL
 404 };
 405
 406 static umode_t ideapad_is_visible(struct kobject *kobj,
 407                                  struct attribute *attr,
 408                                  int idx)
 409 {
 410         struct device *dev = container_of(kobj, struct device, kobj);
 411         struct ideapad_private *priv = dev_get_drvdata(dev);
 412         bool supported;
 413
 414         if (attr == &dev_attr_camera_power.attr)
 415                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
 416         else if (attr == &dev_attr_fan_mode.attr) {
 417                 unsigned long value;
 418                 supported = !read_ec_data(ideapad_handle, VPCCMD_R_FAN, &value);
 419         } else
 420                 supported = true;
 421
 422         return supported ? attr->mode : 0;
 423 }
 424
 425 static struct attribute_group ideapad_attribute_group = {
 426         .is_visible = ideapad_is_visible,
 427         .attrs = ideapad_attributes
 428 };
 429
 430 /*
 431  * Rfkill
 432  */
 433 struct ideapad_rfk_data {
 434         char *name;
 435         int cfgbit;
 436         int opcode;
 437         int type;
 438 };
 439
 440 const struct ideapad_rfk_data ideapad_rfk_data[] = {
 441         { "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
 442         { "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
 443         { "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
 444 };
 445
 446 static int ideapad_rfk_set(void *data, bool blocked)
 447 {
 448         unsigned long opcode = (unsigned long)data;
 449
 450         return write_ec_cmd(ideapad_handle, opcode, !blocked);
 451 }
 452
 453 static struct rfkill_ops ideapad_rfk_ops = {
 454         .set_block = ideapad_rfk_set,
 455 };
 456
 457 static void ideapad_sync_rfk_state(struct ideapad_private *priv)
 458 {
 459         unsigned long hw_blocked;
 460         int i;
 461
 462         if (read_ec_data(ideapad_handle, VPCCMD_R_RF, &hw_blocked))
 463                 return;
 464         hw_blocked = !hw_blocked;
 465
 466         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 467                 if (priv->rfk[i])
 468                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 469 }
 470
 471 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
 472 {
 473         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 474         int ret;
 475         unsigned long sw_blocked;
 476
 477         if (no_bt_rfkill &&
 478             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 479                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 480                 write_ec_cmd(ideapad_handle,
 481                              ideapad_rfk_data[dev].opcode, 1);
 482                 return 0;
 483         }
 484
 485         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 486                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 487                                       (void *)(long)dev);
 488         if (!priv->rfk[dev])
 489                 return -ENOMEM;
 490
 491         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
 492                          &sw_blocked)) {
 493                 rfkill_init_sw_state(priv->rfk[dev], 0);
 494         } else {
 495                 sw_blocked = !sw_blocked;
 496                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 497         }
 498
 499         ret = rfkill_register(priv->rfk[dev]);
 500         if (ret) {
 501                 rfkill_destroy(priv->rfk[dev]);
 502                 return ret;
 503         }
 504         return 0;
 505 }
 506
 507 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 508 {
 509         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 510
 511         if (!priv->rfk[dev])
 512                 return;
 513
 514         rfkill_unregister(priv->rfk[dev]);
 515         rfkill_destroy(priv->rfk[dev]);
 516 }
 517
 518 /*
 519  * Platform device
 520  */
 521 static int ideapad_platform_init(struct ideapad_private *priv)
 522 {
 523         int result;
 524
 525         priv->platform_device = platform_device_alloc("ideapad", -1);
 526         if (!priv->platform_device)
 527                 return -ENOMEM;
 528         platform_set_drvdata(priv->platform_device, priv);
 529
 530         result = platform_device_add(priv->platform_device);
 531         if (result)
 532                 goto fail_platform_device;
 533
 534         result = sysfs_create_group(&priv->platform_device->dev.kobj,
 535                                     &ideapad_attribute_group);
 536         if (result)
 537                 goto fail_sysfs;
 538         return 0;
 539
 540 fail_sysfs:
 541         platform_device_del(priv->platform_device);
 542 fail_platform_device:
 543         platform_device_put(priv->platform_device);
 544         return result;
 545 }
 546
 547 static void ideapad_platform_exit(struct ideapad_private *priv)
 548 {
 549         sysfs_remove_group(&priv->platform_device->dev.kobj,
 550                            &ideapad_attribute_group);
 551         platform_device_unregister(priv->platform_device);
 552 }
 553
 554 /*
 555  * input device
 556  */
 557 static const struct key_entry ideapad_keymap[] = {
 558         { KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
 559         { KE_KEY, 7,  { KEY_CAMERA } },
 560         { KE_KEY, 11, { KEY_F16 } },
 561         { KE_KEY, 13, { KEY_WLAN } },
 562         { KE_KEY, 16, { KEY_PROG1 } },
 563         { KE_KEY, 17, { KEY_PROG2 } },
 564         { KE_KEY, 64, { KEY_PROG3 } },
 565         { KE_KEY, 65, { KEY_PROG4 } },
 566         { KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
 567         { KE_KEY, 67, { KEY_TOUCHPAD_ON } },
 568         { KE_END, 0 },
 569 };
 570
 571 static int ideapad_input_init(struct ideapad_private *priv)
 572 {
 573         struct input_dev *inputdev;
 574         int error;
 575
 576         inputdev = input_allocate_device();
 577         if (!inputdev) {
 578                 pr_info("Unable to allocate input device\n");
 579                 return -ENOMEM;
 580         }
 581
 582         inputdev->name = "Ideapad extra buttons";
 583         inputdev->phys = "ideapad/input0";
 584         inputdev->id.bustype = BUS_HOST;
 585         inputdev->dev.parent = &priv->platform_device->dev;
 586
 587         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 588         if (error) {
 589                 pr_err("Unable to setup input device keymap\n");
 590                 goto err_free_dev;
 591         }
 592
 593         error = input_register_device(inputdev);
 594         if (error) {
 595                 pr_err("Unable to register input device\n");
 596                 goto err_free_keymap;
 597         }
 598
 599         priv->inputdev = inputdev;
 600         return 0;
 601
 602 err_free_keymap:
 603         sparse_keymap_free(inputdev);
 604 err_free_dev:
 605         input_free_device(inputdev);
 606         return error;
 607 }
 608
 609 static void ideapad_input_exit(struct ideapad_private *priv)
 610 {
 611         sparse_keymap_free(priv->inputdev);
 612         input_unregister_device(priv->inputdev);
 613         priv->inputdev = NULL;
 614 }
 615
 616 static void ideapad_input_report(struct ideapad_private *priv,
 617                                  unsigned long scancode)
 618 {
 619         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 620 }
 621
 622 static void ideapad_input_novokey(struct ideapad_private *priv)
 623 {
 624         unsigned long long_pressed;
 625
 626         if (read_ec_data(ideapad_handle, VPCCMD_R_NOVO, &long_pressed))
 627                 return;
 628         if (long_pressed)
 629                 ideapad_input_report(priv, 17);
 630         else
 631                 ideapad_input_report(priv, 16);
 632 }
 633
 634 static void ideapad_check_special_buttons(struct ideapad_private *priv)
 635 {
 636         unsigned long bit, value;
 637
 638         read_ec_data(ideapad_handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
 639
 640         for (bit = 0; bit < 16; bit++) {
 641                 if (test_bit(bit, &value)) {
 642                         switch (bit) {
 643                         case 0: /* Z580 */
 644                         case 6: /* Z570 */
 645                                 /* Thermal Management button */
 646                                 ideapad_input_report(priv, 65);
 647                                 break;
 648                         case 1:
 649                                 /* OneKey Theater button */
 650                                 ideapad_input_report(priv, 64);
 651                                 break;
 652                         default:
 653                                 pr_info("Unknown special button: %lu\n", bit);
 654                                 break;
 655                         }
 656                 }
 657         }
 658 }
 659
 660 /*
 661  * backlight
 662  */
 663 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
 664 {
 665         unsigned long now;
 666
 667         if (read_ec_data(ideapad_handle, VPCCMD_R_BL, &now))
 668                 return -EIO;
 669         return now;
 670 }
 671
 672 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
 673 {
 674         if (write_ec_cmd(ideapad_handle, VPCCMD_W_BL,
 675                          blightdev->props.brightness))
 676                 return -EIO;
 677         if (write_ec_cmd(ideapad_handle, VPCCMD_W_BL_POWER,
 678                          blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
 679                 return -EIO;
 680
 681         return 0;
 682 }
 683
 684 static const struct backlight_ops ideapad_backlight_ops = {
 685         .get_brightness = ideapad_backlight_get_brightness,
 686         .update_status = ideapad_backlight_update_status,
 687 };
 688
 689 static int ideapad_backlight_init(struct ideapad_private *priv)
 690 {
 691         struct backlight_device *blightdev;
 692         struct backlight_properties props;
 693         unsigned long max, now, power;
 694
 695         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_MAX, &max))
 696                 return -EIO;
 697         if (read_ec_data(ideapad_handle, VPCCMD_R_BL, &now))
 698                 return -EIO;
 699         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &power))
 700                 return -EIO;
 701
 702         memset(&props, 0, sizeof(struct backlight_properties));
 703         props.max_brightness = max;
 704         props.type = BACKLIGHT_PLATFORM;
 705         blightdev = backlight_device_register("ideapad",
 706                                               &priv->platform_device->dev,
 707                                               priv,
 708                                               &ideapad_backlight_ops,
 709                                               &props);
 710         if (IS_ERR(blightdev)) {
 711                 pr_err("Could not register backlight device\n");
 712                 return PTR_ERR(blightdev);
 713         }
 714
 715         priv->blightdev = blightdev;
 716         blightdev->props.brightness = now;
 717         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 718         backlight_update_status(blightdev);
 719
 720         return 0;
 721 }
 722
 723 static void ideapad_backlight_exit(struct ideapad_private *priv)
 724 {
 725         if (priv->blightdev)
 726                 backlight_device_unregister(priv->blightdev);
 727         priv->blightdev = NULL;
 728 }
 729
 730 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
 731 {
 732         unsigned long power;
 733         struct backlight_device *blightdev = priv->blightdev;
 734
 735         if (!blightdev)
 736                 return;
 737         if (read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &power))
 738                 return;
 739         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 740 }
 741
 742 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
 743 {
 744         unsigned long now;
 745
 746         /* if we control brightness via acpi video driver */
 747         if (priv->blightdev == NULL) {
 748                 read_ec_data(ideapad_handle, VPCCMD_R_BL, &now);
 749                 return;
 750         }
 751
 752         backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
 753 }
 754
 755 /*
 756  * module init/exit
 757  */
 758 static const struct acpi_device_id ideapad_device_ids[] = {
 759         { "VPC2004", 0},
 760         { "", 0},
 761 };
 762 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 763
 764 static void ideapad_sync_touchpad_state(struct acpi_device *adevice)
 765 {
 766         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 767         unsigned long value;
 768
 769         /* Without reading from EC touchpad LED doesn't switch state */
 770         if (!read_ec_data(adevice->handle, VPCCMD_R_TOUCHPAD, &value)) {
 771                 /* Some IdeaPads don't really turn off touchpad - they only
 772                  * switch the LED state. We (de)activate KBC AUX port to turn
 773                  * touchpad off and on. We send KEY_TOUCHPAD_OFF and
 774                  * KEY_TOUCHPAD_ON to not to get out of sync with LED */
 775                 unsigned char param;
 776                 i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
 777                               I8042_CMD_AUX_DISABLE);
 778                 ideapad_input_report(priv, value ? 67 : 66);
 779         }
 780 }
 781
 782 static int ideapad_acpi_add(struct acpi_device *adevice)
 783 {
 784         int ret, i;
 785         int cfg;
 786         struct ideapad_private *priv;
 787
 788         if (read_method_int(adevice->handle, "_CFG", &cfg))
 789                 return -ENODEV;
 790
 791         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 792         if (!priv)
 793                 return -ENOMEM;
 794         dev_set_drvdata(&adevice->dev, priv);
 795         ideapad_priv = priv;
 796         ideapad_handle = adevice->handle;
 797         priv->cfg = cfg;
 798
 799         ret = ideapad_platform_init(priv);
 800         if (ret)
 801                 goto platform_failed;
 802
 803         ret = ideapad_debugfs_init(priv);
 804         if (ret)
 805                 goto debugfs_failed;
 806
 807         ret = ideapad_input_init(priv);
 808         if (ret)
 809                 goto input_failed;
 810
 811         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
 812                 if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
 813                         ideapad_register_rfkill(adevice, i);
 814                 else
 815                         priv->rfk[i] = NULL;
 816         }
 817         ideapad_sync_rfk_state(priv);
 818         ideapad_sync_touchpad_state(adevice);
 819
 820         if (!acpi_video_backlight_support()) {
 821                 ret = ideapad_backlight_init(priv);
 822                 if (ret && ret != -ENODEV)
 823                         goto backlight_failed;
 824         }
 825
 826         return 0;
 827
 828 backlight_failed:
 829         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 830                 ideapad_unregister_rfkill(adevice, i);
 831         ideapad_input_exit(priv);
 832 input_failed:
 833         ideapad_debugfs_exit(priv);
 834 debugfs_failed:
 835         ideapad_platform_exit(priv);
 836 platform_failed:
 837         kfree(priv);
 838         return ret;
 839 }
 840
 841 static int ideapad_acpi_remove(struct acpi_device *adevice)
 842 {
 843         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 844         int i;
 845
 846         ideapad_backlight_exit(priv);
 847         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 848                 ideapad_unregister_rfkill(adevice, i);
 849         ideapad_input_exit(priv);
 850         ideapad_debugfs_exit(priv);
 851         ideapad_platform_exit(priv);
 852         dev_set_drvdata(&adevice->dev, NULL);
 853         kfree(priv);
 854
 855         return 0;
 856 }
 857
 858 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 859 {
 860         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 861         acpi_handle handle = adevice->handle;
 862         unsigned long vpc1, vpc2, vpc_bit;
 863
 864         if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
 865                 return;
 866         if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
 867                 return;
 868
 869         vpc1 = (vpc2 << 8) | vpc1;
 870         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 871                 if (test_bit(vpc_bit, &vpc1)) {
 872                         switch (vpc_bit) {
 873                         case 9:
 874                                 ideapad_sync_rfk_state(priv);
 875                                 break;
 876                         case 13:
 877                         case 11:
 878                         case 7:
 879                         case 6:
 880                                 ideapad_input_report(priv, vpc_bit);
 881                                 break;
 882                         case 5:
 883                                 ideapad_sync_touchpad_state(adevice);
 884                                 break;
 885                         case 4:
 886                                 ideapad_backlight_notify_brightness(priv);
 887                                 break;
 888                         case 3:
 889                                 ideapad_input_novokey(priv);
 890                                 break;
 891                         case 2:
 892                                 ideapad_backlight_notify_power(priv);
 893                                 break;
 894                         case 0:
 895                                 ideapad_check_special_buttons(priv);
 896                                 break;
 897                         default:
 898                                 pr_info("Unknown event: %lu\n", vpc_bit);
 899                         }
 900                 }
 901         }
 902 }
 903
 904 static int ideapad_acpi_resume(struct device *device)
 905 {
 906         ideapad_sync_rfk_state(ideapad_priv);
 907         ideapad_sync_touchpad_state(to_acpi_device(device));
 908         return 0;
 909 }
 910
 911 static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
 912
 913 static struct acpi_driver ideapad_acpi_driver = {
 914         .name = "ideapad_acpi",
 915         .class = "IdeaPad",
 916         .ids = ideapad_device_ids,
 917         .ops.add = ideapad_acpi_add,
 918         .ops.remove = ideapad_acpi_remove,
 919         .ops.notify = ideapad_acpi_notify,
 920         .drv.pm = &ideapad_pm,
 921         .owner = THIS_MODULE,
 922 };
 923 module_acpi_driver(ideapad_acpi_driver);
 924
 925 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 926 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 927 MODULE_LICENSE("GPL");