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