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 <linux/acpi.h>
  30 #include <linux/rfkill.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/input.h>
  33 #include <linux/input/sparse-keymap.h>
  34 #include <linux/backlight.h>
  35 #include <linux/fb.h>
  36 #include <linux/debugfs.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/i8042.h>
  39 #include <linux/dmi.h>
  40 #include <linux/device.h>
  41 #include <acpi/video.h>
  42
  43 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  44
  45 #define CFG_BT_BIT      (16)
  46 #define CFG_3G_BIT      (17)
  47 #define CFG_WIFI_BIT    (18)
  48 #define CFG_CAMERA_BIT  (19)
  49
  50 #if IS_ENABLED(CONFIG_ACPI_WMI)
  51 static const char *const ideapad_wmi_fnesc_events[] = {
  52         "26CAB2E5-5CF1-46AE-AAC3-4A12B6BA50E6", /* Yoga 3 */
  53         "56322276-8493-4CE8-A783-98C991274F5E", /* Yoga 700 */
  54 };
  55 #endif
  56
  57 enum {
  58         VPCCMD_R_VPC1 = 0x10,
  59         VPCCMD_R_BL_MAX,
  60         VPCCMD_R_BL,
  61         VPCCMD_W_BL,
  62         VPCCMD_R_WIFI,
  63         VPCCMD_W_WIFI,
  64         VPCCMD_R_BT,
  65         VPCCMD_W_BT,
  66         VPCCMD_R_BL_POWER,
  67         VPCCMD_R_NOVO,
  68         VPCCMD_R_VPC2,
  69         VPCCMD_R_TOUCHPAD,
  70         VPCCMD_W_TOUCHPAD,
  71         VPCCMD_R_CAMERA,
  72         VPCCMD_W_CAMERA,
  73         VPCCMD_R_3G,
  74         VPCCMD_W_3G,
  75         VPCCMD_R_ODD, /* 0x21 */
  76         VPCCMD_W_FAN,
  77         VPCCMD_R_RF,
  78         VPCCMD_W_RF,
  79         VPCCMD_R_FAN = 0x2B,
  80         VPCCMD_R_SPECIAL_BUTTONS = 0x31,
  81         VPCCMD_W_BL_POWER = 0x33,
  82 };
  83
  84 struct ideapad_rfk_priv {
  85         int dev;
  86         struct ideapad_private *priv;
  87 };
  88
  89 struct ideapad_private {
  90         struct acpi_device *adev;
  91         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  92         struct ideapad_rfk_priv rfk_priv[IDEAPAD_RFKILL_DEV_NUM];
  93         struct platform_device *platform_device;
  94         struct input_dev *inputdev;
  95         struct backlight_device *blightdev;
  96         struct dentry *debug;
  97         unsigned long cfg;
  98         bool has_hw_rfkill_switch;
  99         const char *fnesc_guid;
 100 };
 101
 102 static bool no_bt_rfkill;
 103 module_param(no_bt_rfkill, bool, 0444);
 104 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
 105
 106 /*
 107  * ACPI Helpers
 108  */
 109 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
 110
 111 static int read_method_int(acpi_handle handle, const char *method, int *val)
 112 {
 113         acpi_status status;
 114         unsigned long long result;
 115
 116         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 117         if (ACPI_FAILURE(status)) {
 118                 *val = -1;
 119                 return -1;
 120         } else {
 121                 *val = result;
 122                 return 0;
 123         }
 124 }
 125
 126 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
 127 {
 128         acpi_status status;
 129         unsigned long long result;
 130         struct acpi_object_list params;
 131         union acpi_object in_obj;
 132
 133         params.count = 1;
 134         params.pointer = &in_obj;
 135         in_obj.type = ACPI_TYPE_INTEGER;
 136         in_obj.integer.value = cmd;
 137
 138         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
 139
 140         if (ACPI_FAILURE(status)) {
 141                 *ret = -1;
 142                 return -1;
 143         } else {
 144                 *ret = result;
 145                 return 0;
 146         }
 147 }
 148
 149 static int method_vpcw(acpi_handle handle, int cmd, int data)
 150 {
 151         struct acpi_object_list params;
 152         union acpi_object in_obj[2];
 153         acpi_status status;
 154
 155         params.count = 2;
 156         params.pointer = in_obj;
 157         in_obj[0].type = ACPI_TYPE_INTEGER;
 158         in_obj[0].integer.value = cmd;
 159         in_obj[1].type = ACPI_TYPE_INTEGER;
 160         in_obj[1].integer.value = data;
 161
 162         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 163         if (status != AE_OK)
 164                 return -1;
 165         return 0;
 166 }
 167
 168 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 169 {
 170         int val;
 171         unsigned long int end_jiffies;
 172
 173         if (method_vpcw(handle, 1, cmd))
 174                 return -1;
 175
 176         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 177              time_before(jiffies, end_jiffies);) {
 178                 schedule();
 179                 if (method_vpcr(handle, 1, &val))
 180                         return -1;
 181                 if (val == 0) {
 182                         if (method_vpcr(handle, 0, &val))
 183                                 return -1;
 184                         *data = val;
 185                         return 0;
 186                 }
 187         }
 188         pr_err("timeout in read_ec_cmd\n");
 189         return -1;
 190 }
 191
 192 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 193 {
 194         int val;
 195         unsigned long int end_jiffies;
 196
 197         if (method_vpcw(handle, 0, data))
 198                 return -1;
 199         if (method_vpcw(handle, 1, cmd))
 200                 return -1;
 201
 202         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 203              time_before(jiffies, end_jiffies);) {
 204                 schedule();
 205                 if (method_vpcr(handle, 1, &val))
 206                         return -1;
 207                 if (val == 0)
 208                         return 0;
 209         }
 210         pr_err("timeout in write_ec_cmd\n");
 211         return -1;
 212 }
 213
 214 /*
 215  * debugfs
 216  */
 217 static int debugfs_status_show(struct seq_file *s, void *data)
 218 {
 219         struct ideapad_private *priv = s->private;
 220         unsigned long value;
 221
 222         if (!priv)
 223                 return -EINVAL;
 224
 225         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value))
 226                 seq_printf(s, "Backlight max:\t%lu\n", value);
 227         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value))
 228                 seq_printf(s, "Backlight now:\t%lu\n", value);
 229         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value))
 230                 seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
 231         seq_printf(s, "=====================\n");
 232
 233         if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value))
 234                 seq_printf(s, "Radio status:\t%s(%lu)\n",
 235                            value ? "On" : "Off", value);
 236         if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value))
 237                 seq_printf(s, "Wifi status:\t%s(%lu)\n",
 238                            value ? "On" : "Off", value);
 239         if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value))
 240                 seq_printf(s, "BT status:\t%s(%lu)\n",
 241                            value ? "On" : "Off", value);
 242         if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value))
 243                 seq_printf(s, "3G status:\t%s(%lu)\n",
 244                            value ? "On" : "Off", value);
 245         seq_printf(s, "=====================\n");
 246
 247         if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value))
 248                 seq_printf(s, "Touchpad status:%s(%lu)\n",
 249                            value ? "On" : "Off", value);
 250         if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))
 251                 seq_printf(s, "Camera status:\t%s(%lu)\n",
 252                            value ? "On" : "Off", value);
 253
 254         return 0;
 255 }
 256
 257 static int debugfs_status_open(struct inode *inode, struct file *file)
 258 {
 259         return single_open(file, debugfs_status_show, inode->i_private);
 260 }
 261
 262 static const struct file_operations debugfs_status_fops = {
 263         .owner = THIS_MODULE,
 264         .open = debugfs_status_open,
 265         .read = seq_read,
 266         .llseek = seq_lseek,
 267         .release = single_release,
 268 };
 269
 270 static int debugfs_cfg_show(struct seq_file *s, void *data)
 271 {
 272         struct ideapad_private *priv = s->private;
 273
 274         if (!priv) {
 275                 seq_printf(s, "cfg: N/A\n");
 276         } else {
 277                 seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
 278                            priv->cfg);
 279                 if (test_bit(CFG_BT_BIT, &priv->cfg))
 280                         seq_printf(s, "Bluetooth ");
 281                 if (test_bit(CFG_3G_BIT, &priv->cfg))
 282                         seq_printf(s, "3G ");
 283                 if (test_bit(CFG_WIFI_BIT, &priv->cfg))
 284                         seq_printf(s, "Wireless ");
 285                 if (test_bit(CFG_CAMERA_BIT, &priv->cfg))
 286                         seq_printf(s, "Camera ");
 287                 seq_printf(s, "\nGraphic: ");
 288                 switch ((priv->cfg)&0x700) {
 289                 case 0x100:
 290                         seq_printf(s, "Intel");
 291                         break;
 292                 case 0x200:
 293                         seq_printf(s, "ATI");
 294                         break;
 295                 case 0x300:
 296                         seq_printf(s, "Nvidia");
 297                         break;
 298                 case 0x400:
 299                         seq_printf(s, "Intel and ATI");
 300                         break;
 301                 case 0x500:
 302                         seq_printf(s, "Intel and Nvidia");
 303                         break;
 304                 }
 305                 seq_printf(s, "\n");
 306         }
 307         return 0;
 308 }
 309
 310 static int debugfs_cfg_open(struct inode *inode, struct file *file)
 311 {
 312         return single_open(file, debugfs_cfg_show, inode->i_private);
 313 }
 314
 315 static const struct file_operations debugfs_cfg_fops = {
 316         .owner = THIS_MODULE,
 317         .open = debugfs_cfg_open,
 318         .read = seq_read,
 319         .llseek = seq_lseek,
 320         .release = single_release,
 321 };
 322
 323 static int ideapad_debugfs_init(struct ideapad_private *priv)
 324 {
 325         struct dentry *node;
 326
 327         priv->debug = debugfs_create_dir("ideapad", NULL);
 328         if (priv->debug == NULL) {
 329                 pr_err("failed to create debugfs directory");
 330                 goto errout;
 331         }
 332
 333         node = debugfs_create_file("cfg", S_IRUGO, priv->debug, priv,
 334                                    &debugfs_cfg_fops);
 335         if (!node) {
 336                 pr_err("failed to create cfg in debugfs");
 337                 goto errout;
 338         }
 339
 340         node = debugfs_create_file("status", S_IRUGO, priv->debug, priv,
 341                                    &debugfs_status_fops);
 342         if (!node) {
 343                 pr_err("failed to create status in debugfs");
 344                 goto errout;
 345         }
 346
 347         return 0;
 348
 349 errout:
 350         return -ENOMEM;
 351 }
 352
 353 static void ideapad_debugfs_exit(struct ideapad_private *priv)
 354 {
 355         debugfs_remove_recursive(priv->debug);
 356         priv->debug = NULL;
 357 }
 358
 359 /*
 360  * sysfs
 361  */
 362 static ssize_t show_ideapad_cam(struct device *dev,
 363                                 struct device_attribute *attr,
 364                                 char *buf)
 365 {
 366         unsigned long result;
 367         struct ideapad_private *priv = dev_get_drvdata(dev);
 368
 369         if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result))
 370                 return sprintf(buf, "-1\n");
 371         return sprintf(buf, "%lu\n", result);
 372 }
 373
 374 static ssize_t store_ideapad_cam(struct device *dev,
 375                                  struct device_attribute *attr,
 376                                  const char *buf, size_t count)
 377 {
 378         int ret, state;
 379         struct ideapad_private *priv = dev_get_drvdata(dev);
 380
 381         if (!count)
 382                 return 0;
 383         if (sscanf(buf, "%i", &state) != 1)
 384                 return -EINVAL;
 385         ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state);
 386         if (ret < 0)
 387                 return -EIO;
 388         return count;
 389 }
 390
 391 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 392
 393 static ssize_t show_ideapad_fan(struct device *dev,
 394                                 struct device_attribute *attr,
 395                                 char *buf)
 396 {
 397         unsigned long result;
 398         struct ideapad_private *priv = dev_get_drvdata(dev);
 399
 400         if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result))
 401                 return sprintf(buf, "-1\n");
 402         return sprintf(buf, "%lu\n", result);
 403 }
 404
 405 static ssize_t store_ideapad_fan(struct device *dev,
 406                                  struct device_attribute *attr,
 407                                  const char *buf, size_t count)
 408 {
 409         int ret, state;
 410         struct ideapad_private *priv = dev_get_drvdata(dev);
 411
 412         if (!count)
 413                 return 0;
 414         if (sscanf(buf, "%i", &state) != 1)
 415                 return -EINVAL;
 416         if (state < 0 || state > 4 || state == 3)
 417                 return -EINVAL;
 418         ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state);
 419         if (ret < 0)
 420                 return -EIO;
 421         return count;
 422 }
 423
 424 static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
 425
 426 static struct attribute *ideapad_attributes[] = {
 427         &dev_attr_camera_power.attr,
 428         &dev_attr_fan_mode.attr,
 429         NULL
 430 };
 431
 432 static umode_t ideapad_is_visible(struct kobject *kobj,
 433                                  struct attribute *attr,
 434                                  int idx)
 435 {
 436         struct device *dev = container_of(kobj, struct device, kobj);
 437         struct ideapad_private *priv = dev_get_drvdata(dev);
 438         bool supported;
 439
 440         if (attr == &dev_attr_camera_power.attr)
 441                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
 442         else if (attr == &dev_attr_fan_mode.attr) {
 443                 unsigned long value;
 444                 supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,
 445                                           &value);
 446         } else
 447                 supported = true;
 448
 449         return supported ? attr->mode : 0;
 450 }
 451
 452 static const struct attribute_group ideapad_attribute_group = {
 453         .is_visible = ideapad_is_visible,
 454         .attrs = ideapad_attributes
 455 };
 456
 457 /*
 458  * Rfkill
 459  */
 460 struct ideapad_rfk_data {
 461         char *name;
 462         int cfgbit;
 463         int opcode;
 464         int type;
 465 };
 466
 467 static const struct ideapad_rfk_data ideapad_rfk_data[] = {
 468         { "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
 469         { "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
 470         { "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
 471 };
 472
 473 static int ideapad_rfk_set(void *data, bool blocked)
 474 {
 475         struct ideapad_rfk_priv *priv = data;
 476         int opcode = ideapad_rfk_data[priv->dev].opcode;
 477
 478         return write_ec_cmd(priv->priv->adev->handle, opcode, !blocked);
 479 }
 480
 481 static struct rfkill_ops ideapad_rfk_ops = {
 482         .set_block = ideapad_rfk_set,
 483 };
 484
 485 static void ideapad_sync_rfk_state(struct ideapad_private *priv)
 486 {
 487         unsigned long hw_blocked = 0;
 488         int i;
 489
 490         if (priv->has_hw_rfkill_switch) {
 491                 if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked))
 492                         return;
 493                 hw_blocked = !hw_blocked;
 494         }
 495
 496         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 497                 if (priv->rfk[i])
 498                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 499 }
 500
 501 static int ideapad_register_rfkill(struct ideapad_private *priv, int dev)
 502 {
 503         int ret;
 504         unsigned long sw_blocked;
 505
 506         if (no_bt_rfkill &&
 507             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 508                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 509                 write_ec_cmd(priv->adev->handle,
 510                              ideapad_rfk_data[dev].opcode, 1);
 511                 return 0;
 512         }
 513         priv->rfk_priv[dev].dev = dev;
 514         priv->rfk_priv[dev].priv = priv;
 515
 516         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name,
 517                                       &priv->platform_device->dev,
 518                                       ideapad_rfk_data[dev].type,
 519                                       &ideapad_rfk_ops,
 520                                       &priv->rfk_priv[dev]);
 521         if (!priv->rfk[dev])
 522                 return -ENOMEM;
 523
 524         if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1,
 525                          &sw_blocked)) {
 526                 rfkill_init_sw_state(priv->rfk[dev], 0);
 527         } else {
 528                 sw_blocked = !sw_blocked;
 529                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 530         }
 531
 532         ret = rfkill_register(priv->rfk[dev]);
 533         if (ret) {
 534                 rfkill_destroy(priv->rfk[dev]);
 535                 return ret;
 536         }
 537         return 0;
 538 }
 539
 540 static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev)
 541 {
 542         if (!priv->rfk[dev])
 543                 return;
 544
 545         rfkill_unregister(priv->rfk[dev]);
 546         rfkill_destroy(priv->rfk[dev]);
 547 }
 548
 549 /*
 550  * Platform device
 551  */
 552 static int ideapad_sysfs_init(struct ideapad_private *priv)
 553 {
 554         return sysfs_create_group(&priv->platform_device->dev.kobj,
 555                                     &ideapad_attribute_group);
 556 }
 557
 558 static void ideapad_sysfs_exit(struct ideapad_private *priv)
 559 {
 560         sysfs_remove_group(&priv->platform_device->dev.kobj,
 561                            &ideapad_attribute_group);
 562 }
 563
 564 /*
 565  * input device
 566  */
 567 static const struct key_entry ideapad_keymap[] = {
 568         { KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
 569         { KE_KEY, 7,  { KEY_CAMERA } },
 570         { KE_KEY, 11, { KEY_F16 } },
 571         { KE_KEY, 13, { KEY_WLAN } },
 572         { KE_KEY, 16, { KEY_PROG1 } },
 573         { KE_KEY, 17, { KEY_PROG2 } },
 574         { KE_KEY, 64, { KEY_PROG3 } },
 575         { KE_KEY, 65, { KEY_PROG4 } },
 576         { KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
 577         { KE_KEY, 67, { KEY_TOUCHPAD_ON } },
 578         { KE_KEY, 128, { KEY_ESC } },
 579
 580         { KE_END, 0 },
 581 };
 582
 583 static int ideapad_input_init(struct ideapad_private *priv)
 584 {
 585         struct input_dev *inputdev;
 586         int error;
 587
 588         inputdev = input_allocate_device();
 589         if (!inputdev)
 590                 return -ENOMEM;
 591
 592         inputdev->name = "Ideapad extra buttons";
 593         inputdev->phys = "ideapad/input0";
 594         inputdev->id.bustype = BUS_HOST;
 595         inputdev->dev.parent = &priv->platform_device->dev;
 596
 597         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 598         if (error) {
 599                 pr_err("Unable to setup input device keymap\n");
 600                 goto err_free_dev;
 601         }
 602
 603         error = input_register_device(inputdev);
 604         if (error) {
 605                 pr_err("Unable to register input device\n");
 606                 goto err_free_keymap;
 607         }
 608
 609         priv->inputdev = inputdev;
 610         return 0;
 611
 612 err_free_keymap:
 613         sparse_keymap_free(inputdev);
 614 err_free_dev:
 615         input_free_device(inputdev);
 616         return error;
 617 }
 618
 619 static void ideapad_input_exit(struct ideapad_private *priv)
 620 {
 621         sparse_keymap_free(priv->inputdev);
 622         input_unregister_device(priv->inputdev);
 623         priv->inputdev = NULL;
 624 }
 625
 626 static void ideapad_input_report(struct ideapad_private *priv,
 627                                  unsigned long scancode)
 628 {
 629         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 630 }
 631
 632 static void ideapad_input_novokey(struct ideapad_private *priv)
 633 {
 634         unsigned long long_pressed;
 635
 636         if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed))
 637                 return;
 638         if (long_pressed)
 639                 ideapad_input_report(priv, 17);
 640         else
 641                 ideapad_input_report(priv, 16);
 642 }
 643
 644 static void ideapad_check_special_buttons(struct ideapad_private *priv)
 645 {
 646         unsigned long bit, value;
 647
 648         read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
 649
 650         for (bit = 0; bit < 16; bit++) {
 651                 if (test_bit(bit, &value)) {
 652                         switch (bit) {
 653                         case 0: /* Z580 */
 654                         case 6: /* Z570 */
 655                                 /* Thermal Management button */
 656                                 ideapad_input_report(priv, 65);
 657                                 break;
 658                         case 1:
 659                                 /* OneKey Theater button */
 660                                 ideapad_input_report(priv, 64);
 661                                 break;
 662                         default:
 663                                 pr_info("Unknown special button: %lu\n", bit);
 664                                 break;
 665                         }
 666                 }
 667         }
 668 }
 669
 670 /*
 671  * backlight
 672  */
 673 static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
 674 {
 675         struct ideapad_private *priv = bl_get_data(blightdev);
 676         unsigned long now;
 677
 678         if (!priv)
 679                 return -EINVAL;
 680
 681         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
 682                 return -EIO;
 683         return now;
 684 }
 685
 686 static int ideapad_backlight_update_status(struct backlight_device *blightdev)
 687 {
 688         struct ideapad_private *priv = bl_get_data(blightdev);
 689
 690         if (!priv)
 691                 return -EINVAL;
 692
 693         if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL,
 694                          blightdev->props.brightness))
 695                 return -EIO;
 696         if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER,
 697                          blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
 698                 return -EIO;
 699
 700         return 0;
 701 }
 702
 703 static const struct backlight_ops ideapad_backlight_ops = {
 704         .get_brightness = ideapad_backlight_get_brightness,
 705         .update_status = ideapad_backlight_update_status,
 706 };
 707
 708 static int ideapad_backlight_init(struct ideapad_private *priv)
 709 {
 710         struct backlight_device *blightdev;
 711         struct backlight_properties props;
 712         unsigned long max, now, power;
 713
 714         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max))
 715                 return -EIO;
 716         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
 717                 return -EIO;
 718         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
 719                 return -EIO;
 720
 721         memset(&props, 0, sizeof(struct backlight_properties));
 722         props.max_brightness = max;
 723         props.type = BACKLIGHT_PLATFORM;
 724         blightdev = backlight_device_register("ideapad",
 725                                               &priv->platform_device->dev,
 726                                               priv,
 727                                               &ideapad_backlight_ops,
 728                                               &props);
 729         if (IS_ERR(blightdev)) {
 730                 pr_err("Could not register backlight device\n");
 731                 return PTR_ERR(blightdev);
 732         }
 733
 734         priv->blightdev = blightdev;
 735         blightdev->props.brightness = now;
 736         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 737         backlight_update_status(blightdev);
 738
 739         return 0;
 740 }
 741
 742 static void ideapad_backlight_exit(struct ideapad_private *priv)
 743 {
 744         backlight_device_unregister(priv->blightdev);
 745         priv->blightdev = NULL;
 746 }
 747
 748 static void ideapad_backlight_notify_power(struct ideapad_private *priv)
 749 {
 750         unsigned long power;
 751         struct backlight_device *blightdev = priv->blightdev;
 752
 753         if (!blightdev)
 754                 return;
 755         if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
 756                 return;
 757         blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 758 }
 759
 760 static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
 761 {
 762         unsigned long now;
 763
 764         /* if we control brightness via acpi video driver */
 765         if (priv->blightdev == NULL) {
 766                 read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now);
 767                 return;
 768         }
 769
 770         backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
 771 }
 772
 773 /*
 774  * module init/exit
 775  */
 776 static void ideapad_sync_touchpad_state(struct ideapad_private *priv)
 777 {
 778         unsigned long value;
 779
 780         /* Without reading from EC touchpad LED doesn't switch state */
 781         if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) {
 782                 /* Some IdeaPads don't really turn off touchpad - they only
 783                  * switch the LED state. We (de)activate KBC AUX port to turn
 784                  * touchpad off and on. We send KEY_TOUCHPAD_OFF and
 785                  * KEY_TOUCHPAD_ON to not to get out of sync with LED */
 786                 unsigned char param;
 787                 i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
 788                               I8042_CMD_AUX_DISABLE);
 789                 ideapad_input_report(priv, value ? 67 : 66);
 790         }
 791 }
 792
 793 static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
 794 {
 795         struct ideapad_private *priv = data;
 796         unsigned long vpc1, vpc2, vpc_bit;
 797
 798         if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
 799                 return;
 800         if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
 801                 return;
 802
 803         vpc1 = (vpc2 << 8) | vpc1;
 804         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 805                 if (test_bit(vpc_bit, &vpc1)) {
 806                         switch (vpc_bit) {
 807                         case 9:
 808                                 ideapad_sync_rfk_state(priv);
 809                                 break;
 810                         case 13:
 811                         case 11:
 812                         case 7:
 813                         case 6:
 814                                 ideapad_input_report(priv, vpc_bit);
 815                                 break;
 816                         case 5:
 817                                 ideapad_sync_touchpad_state(priv);
 818                                 break;
 819                         case 4:
 820                                 ideapad_backlight_notify_brightness(priv);
 821                                 break;
 822                         case 3:
 823                                 ideapad_input_novokey(priv);
 824                                 break;
 825                         case 2:
 826                                 ideapad_backlight_notify_power(priv);
 827                                 break;
 828                         case 0:
 829                                 ideapad_check_special_buttons(priv);
 830                                 break;
 831                         default:
 832                                 pr_info("Unknown event: %lu\n", vpc_bit);
 833                         }
 834                 }
 835         }
 836 }
 837
 838 #if IS_ENABLED(CONFIG_ACPI_WMI)
 839 static void ideapad_wmi_notify(u32 value, void *context)
 840 {
 841         switch (value) {
 842         case 128:
 843                 ideapad_input_report(context, value);
 844                 break;
 845         default:
 846                 pr_info("Unknown WMI event %u\n", value);
 847         }
 848 }
 849 #endif
 850
 851 /*
 852  * Some ideapads don't have a hardware rfkill switch, reading VPCCMD_R_RF
 853  * always results in 0 on these models, causing ideapad_laptop to wrongly
 854  * report all radios as hardware-blocked.
 855  */
 856 static const struct dmi_system_id no_hw_rfkill_list[] = {
 857         {
 858                 .ident = "Lenovo G40-30",
 859                 .matches = {
 860                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 861                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G40-30"),
 862                 },
 863         },
 864         {
 865                 .ident = "Lenovo G50-30",
 866                 .matches = {
 867                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 868                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G50-30"),
 869                 },
 870         },
 871         {
 872                 .ident = "Lenovo ideapad Y700-15ISK",
 873                 .matches = {
 874                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 875                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-15ISK"),
 876                 },
 877         },
 878         {
 879                 .ident = "Lenovo ideapad Y700 Touch-15ISK",
 880                 .matches = {
 881                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 882                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700 Touch-15ISK"),
 883                 },
 884         },
 885         {
 886                 .ident = "Lenovo ideapad Y700-17ISK",
 887                 .matches = {
 888                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 889                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-17ISK"),
 890                 },
 891         },
 892         {
 893                 .ident = "Lenovo Yoga 2 11 / 13 / Pro",
 894                 .matches = {
 895                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 896                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2"),
 897                 },
 898         },
 899         {
 900                 .ident = "Lenovo Yoga 2 11 / 13 / Pro",
 901                 .matches = {
 902                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 903                         DMI_MATCH(DMI_BOARD_NAME, "Yoga2"),
 904                 },
 905         },
 906         {
 907                 .ident = "Lenovo Yoga 3 1170 / 1470",
 908                 .matches = {
 909                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 910                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 3"),
 911                 },
 912         },
 913         {
 914                 .ident = "Lenovo Yoga 3 Pro 1370",
 915                 .matches = {
 916                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 917                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 3"),
 918                 },
 919         },
 920         {
 921                 .ident = "Lenovo Yoga 700",
 922                 .matches = {
 923                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 924                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 700"),
 925                 },
 926         },
 927         {
 928                 .ident = "Lenovo Yoga 900",
 929                 .matches = {
 930                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 931                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 900"),
 932                 },
 933         },
 934         {}
 935 };
 936
 937 static int ideapad_acpi_add(struct platform_device *pdev)
 938 {
 939         int ret, i;
 940         int cfg;
 941         struct ideapad_private *priv;
 942         struct acpi_device *adev;
 943
 944         ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
 945         if (ret)
 946                 return -ENODEV;
 947
 948         if (read_method_int(adev->handle, "_CFG", &cfg))
 949                 return -ENODEV;
 950
 951         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 952         if (!priv)
 953                 return -ENOMEM;
 954
 955         dev_set_drvdata(&pdev->dev, priv);
 956         priv->cfg = cfg;
 957         priv->adev = adev;
 958         priv->platform_device = pdev;
 959         priv->has_hw_rfkill_switch = !dmi_check_system(no_hw_rfkill_list);
 960
 961         ret = ideapad_sysfs_init(priv);
 962         if (ret)
 963                 return ret;
 964
 965         ret = ideapad_debugfs_init(priv);
 966         if (ret)
 967                 goto debugfs_failed;
 968
 969         ret = ideapad_input_init(priv);
 970         if (ret)
 971                 goto input_failed;
 972
 973         /*
 974          * On some models without a hw-switch (the yoga 2 13 at least)
 975          * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.
 976          */
 977         if (!priv->has_hw_rfkill_switch)
 978                 write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);
 979
 980         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 981                 if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
 982                         ideapad_register_rfkill(priv, i);
 983
 984         ideapad_sync_rfk_state(priv);
 985         ideapad_sync_touchpad_state(priv);
 986
 987         if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
 988                 ret = ideapad_backlight_init(priv);
 989                 if (ret && ret != -ENODEV)
 990                         goto backlight_failed;
 991         }
 992         ret = acpi_install_notify_handler(adev->handle,
 993                 ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv);
 994         if (ret)
 995                 goto notification_failed;
 996
 997 #if IS_ENABLED(CONFIG_ACPI_WMI)
 998         for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) {
 999                 ret = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i],
1000                                                  ideapad_wmi_notify, priv);
1001                 if (ret == AE_OK) {
1002                         priv->fnesc_guid = ideapad_wmi_fnesc_events[i];
1003                         break;
1004                 }
1005         }
1006         if (ret != AE_OK && ret != AE_NOT_EXIST)
1007                 goto notification_failed_wmi;
1008 #endif
1009
1010         return 0;
1011 #if IS_ENABLED(CONFIG_ACPI_WMI)
1012 notification_failed_wmi:
1013         acpi_remove_notify_handler(priv->adev->handle,
1014                 ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
1015 #endif
1016 notification_failed:
1017         ideapad_backlight_exit(priv);
1018 backlight_failed:
1019         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
1020                 ideapad_unregister_rfkill(priv, i);
1021         ideapad_input_exit(priv);
1022 input_failed:
1023         ideapad_debugfs_exit(priv);
1024 debugfs_failed:
1025         ideapad_sysfs_exit(priv);
1026         return ret;
1027 }
1028
1029 static int ideapad_acpi_remove(struct platform_device *pdev)
1030 {
1031         struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
1032         int i;
1033
1034 #if IS_ENABLED(CONFIG_ACPI_WMI)
1035         if (priv->fnesc_guid)
1036                 wmi_remove_notify_handler(priv->fnesc_guid);
1037 #endif
1038         acpi_remove_notify_handler(priv->adev->handle,
1039                 ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
1040         ideapad_backlight_exit(priv);
1041         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
1042                 ideapad_unregister_rfkill(priv, i);
1043         ideapad_input_exit(priv);
1044         ideapad_debugfs_exit(priv);
1045         ideapad_sysfs_exit(priv);
1046         dev_set_drvdata(&pdev->dev, NULL);
1047
1048         return 0;
1049 }
1050
1051 #ifdef CONFIG_PM_SLEEP
1052 static int ideapad_acpi_resume(struct device *device)
1053 {
1054         struct ideapad_private *priv;
1055
1056         if (!device)
1057                 return -EINVAL;
1058         priv = dev_get_drvdata(device);
1059
1060         ideapad_sync_rfk_state(priv);
1061         ideapad_sync_touchpad_state(priv);
1062         return 0;
1063 }
1064 #endif
1065 static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
1066
1067 static const struct acpi_device_id ideapad_device_ids[] = {
1068         { "VPC2004", 0},
1069         { "", 0},
1070 };
1071 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
1072
1073 static struct platform_driver ideapad_acpi_driver = {
1074         .probe = ideapad_acpi_add,
1075         .remove = ideapad_acpi_remove,
1076         .driver = {
1077                 .name   = "ideapad_acpi",
1078                 .pm     = &ideapad_pm,
1079                 .acpi_match_table = ACPI_PTR(ideapad_device_ids),
1080         },
1081 };
1082
1083 module_platform_driver(ideapad_acpi_driver);
1084
1085 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1086 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
1087 MODULE_LICENSE("GPL");