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
  36 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  37
  38 #define CFG_BT_BIT      (16)
  39 #define CFG_3G_BIT      (17)
  40 #define CFG_WIFI_BIT    (18)
  41 #define CFG_CAMERA_BIT  (19)
  42
  43 struct ideapad_private {
  44         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  45         struct platform_device *platform_device;
  46         struct input_dev *inputdev;
  47         unsigned long cfg;
  48 };
  49
  50 static acpi_handle ideapad_handle;
  51 static bool no_bt_rfkill;
  52 module_param(no_bt_rfkill, bool, 0444);
  53 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  54
  55 /*
  56  * ACPI Helpers
  57  */
  58 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  59
  60 static int read_method_int(acpi_handle handle, const char *method, int *val)
  61 {
  62         acpi_status status;
  63         unsigned long long result;
  64
  65         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  66         if (ACPI_FAILURE(status)) {
  67                 *val = -1;
  68                 return -1;
  69         } else {
  70                 *val = result;
  71                 return 0;
  72         }
  73 }
  74
  75 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
  76 {
  77         acpi_status status;
  78         unsigned long long result;
  79         struct acpi_object_list params;
  80         union acpi_object in_obj;
  81
  82         params.count = 1;
  83         params.pointer = &in_obj;
  84         in_obj.type = ACPI_TYPE_INTEGER;
  85         in_obj.integer.value = cmd;
  86
  87         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
  88
  89         if (ACPI_FAILURE(status)) {
  90                 *ret = -1;
  91                 return -1;
  92         } else {
  93                 *ret = result;
  94                 return 0;
  95         }
  96 }
  97
  98 static int method_vpcw(acpi_handle handle, int cmd, int data)
  99 {
 100         struct acpi_object_list params;
 101         union acpi_object in_obj[2];
 102         acpi_status status;
 103
 104         params.count = 2;
 105         params.pointer = in_obj;
 106         in_obj[0].type = ACPI_TYPE_INTEGER;
 107         in_obj[0].integer.value = cmd;
 108         in_obj[1].type = ACPI_TYPE_INTEGER;
 109         in_obj[1].integer.value = data;
 110
 111         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 112         if (status != AE_OK)
 113                 return -1;
 114         return 0;
 115 }
 116
 117 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 118 {
 119         int val;
 120         unsigned long int end_jiffies;
 121
 122         if (method_vpcw(handle, 1, cmd))
 123                 return -1;
 124
 125         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 126              time_before(jiffies, end_jiffies);) {
 127                 schedule();
 128                 if (method_vpcr(handle, 1, &val))
 129                         return -1;
 130                 if (val == 0) {
 131                         if (method_vpcr(handle, 0, &val))
 132                                 return -1;
 133                         *data = val;
 134                         return 0;
 135                 }
 136         }
 137         pr_err("timeout in read_ec_cmd\n");
 138         return -1;
 139 }
 140
 141 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 142 {
 143         int val;
 144         unsigned long int end_jiffies;
 145
 146         if (method_vpcw(handle, 0, data))
 147                 return -1;
 148         if (method_vpcw(handle, 1, cmd))
 149                 return -1;
 150
 151         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 152              time_before(jiffies, end_jiffies);) {
 153                 schedule();
 154                 if (method_vpcr(handle, 1, &val))
 155                         return -1;
 156                 if (val == 0)
 157                         return 0;
 158         }
 159         pr_err("timeout in write_ec_cmd\n");
 160         return -1;
 161 }
 162
 163 /*
 164  * sysfs
 165  */
 166 static ssize_t show_ideapad_cam(struct device *dev,
 167                                 struct device_attribute *attr,
 168                                 char *buf)
 169 {
 170         unsigned long result;
 171
 172         if (read_ec_data(ideapad_handle, 0x1D, &result))
 173                 return sprintf(buf, "-1\n");
 174         return sprintf(buf, "%lu\n", result);
 175 }
 176
 177 static ssize_t store_ideapad_cam(struct device *dev,
 178                                  struct device_attribute *attr,
 179                                  const char *buf, size_t count)
 180 {
 181         int ret, state;
 182
 183         if (!count)
 184                 return 0;
 185         if (sscanf(buf, "%i", &state) != 1)
 186                 return -EINVAL;
 187         ret = write_ec_cmd(ideapad_handle, 0x1E, state);
 188         if (ret < 0)
 189                 return ret;
 190         return count;
 191 }
 192
 193 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 194
 195 static ssize_t show_ideapad_cfg(struct device *dev,
 196                                 struct device_attribute *attr,
 197                                 char *buf)
 198 {
 199         struct ideapad_private *priv = dev_get_drvdata(dev);
 200
 201         return sprintf(buf, "0x%.8lX\n", priv->cfg);
 202 }
 203
 204 static DEVICE_ATTR(cfg, 0444, show_ideapad_cfg, NULL);
 205
 206 static struct attribute *ideapad_attributes[] = {
 207         &dev_attr_camera_power.attr,
 208         &dev_attr_cfg.attr,
 209         NULL
 210 };
 211
 212 static mode_t ideapad_is_visible(struct kobject *kobj,
 213                                  struct attribute *attr,
 214                                  int idx)
 215 {
 216         struct device *dev = container_of(kobj, struct device, kobj);
 217         struct ideapad_private *priv = dev_get_drvdata(dev);
 218         bool supported;
 219
 220         if (attr == &dev_attr_camera_power.attr)
 221                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
 222         else
 223                 supported = true;
 224
 225         return supported ? attr->mode : 0;
 226 }
 227
 228 static struct attribute_group ideapad_attribute_group = {
 229         .is_visible = ideapad_is_visible,
 230         .attrs = ideapad_attributes
 231 };
 232
 233 /*
 234  * Rfkill
 235  */
 236 struct ideapad_rfk_data {
 237         char *name;
 238         int cfgbit;
 239         int opcode;
 240         int type;
 241 };
 242
 243 const struct ideapad_rfk_data ideapad_rfk_data[] = {
 244         { "ideapad_wlan",      CFG_WIFI_BIT, 0x15, RFKILL_TYPE_WLAN },
 245         { "ideapad_bluetooth", CFG_BT_BIT,   0x17, RFKILL_TYPE_BLUETOOTH },
 246         { "ideapad_3g",        CFG_3G_BIT,   0x20, RFKILL_TYPE_WWAN },
 247 };
 248
 249 static int ideapad_rfk_set(void *data, bool blocked)
 250 {
 251         unsigned long opcode = (unsigned long)data;
 252
 253         return write_ec_cmd(ideapad_handle, opcode, !blocked);
 254 }
 255
 256 static struct rfkill_ops ideapad_rfk_ops = {
 257         .set_block = ideapad_rfk_set,
 258 };
 259
 260 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 261 {
 262         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 263         unsigned long hw_blocked;
 264         int i;
 265
 266         if (read_ec_data(ideapad_handle, 0x23, &hw_blocked))
 267                 return;
 268         hw_blocked = !hw_blocked;
 269
 270         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 271                 if (priv->rfk[i])
 272                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 273 }
 274
 275 static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
 276                                              int dev)
 277 {
 278         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 279         int ret;
 280         unsigned long sw_blocked;
 281
 282         if (no_bt_rfkill &&
 283             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 284                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 285                 write_ec_cmd(ideapad_handle,
 286                              ideapad_rfk_data[dev].opcode, 1);
 287                 return 0;
 288         }
 289
 290         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 291                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 292                                       (void *)(long)dev);
 293         if (!priv->rfk[dev])
 294                 return -ENOMEM;
 295
 296         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
 297                          &sw_blocked)) {
 298                 rfkill_init_sw_state(priv->rfk[dev], 0);
 299         } else {
 300                 sw_blocked = !sw_blocked;
 301                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 302         }
 303
 304         ret = rfkill_register(priv->rfk[dev]);
 305         if (ret) {
 306                 rfkill_destroy(priv->rfk[dev]);
 307                 return ret;
 308         }
 309         return 0;
 310 }
 311
 312 static void __devexit ideapad_unregister_rfkill(struct acpi_device *adevice,
 313                                                 int dev)
 314 {
 315         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 316
 317         if (!priv->rfk[dev])
 318                 return;
 319
 320         rfkill_unregister(priv->rfk[dev]);
 321         rfkill_destroy(priv->rfk[dev]);
 322 }
 323
 324 /*
 325  * Platform device
 326  */
 327 static int __devinit ideapad_platform_init(struct ideapad_private *priv)
 328 {
 329         int result;
 330
 331         priv->platform_device = platform_device_alloc("ideapad", -1);
 332         if (!priv->platform_device)
 333                 return -ENOMEM;
 334         platform_set_drvdata(priv->platform_device, priv);
 335
 336         result = platform_device_add(priv->platform_device);
 337         if (result)
 338                 goto fail_platform_device;
 339
 340         result = sysfs_create_group(&priv->platform_device->dev.kobj,
 341                                     &ideapad_attribute_group);
 342         if (result)
 343                 goto fail_sysfs;
 344         return 0;
 345
 346 fail_sysfs:
 347         platform_device_del(priv->platform_device);
 348 fail_platform_device:
 349         platform_device_put(priv->platform_device);
 350         return result;
 351 }
 352
 353 static void ideapad_platform_exit(struct ideapad_private *priv)
 354 {
 355         sysfs_remove_group(&priv->platform_device->dev.kobj,
 356                            &ideapad_attribute_group);
 357         platform_device_unregister(priv->platform_device);
 358 }
 359
 360 /*
 361  * input device
 362  */
 363 static const struct key_entry ideapad_keymap[] = {
 364         { KE_KEY, 0x06, { KEY_SWITCHVIDEOMODE } },
 365         { KE_KEY, 0x0D, { KEY_WLAN } },
 366         { KE_END, 0 },
 367 };
 368
 369 static int __devinit ideapad_input_init(struct ideapad_private *priv)
 370 {
 371         struct input_dev *inputdev;
 372         int error;
 373
 374         inputdev = input_allocate_device();
 375         if (!inputdev) {
 376                 pr_info("Unable to allocate input device\n");
 377                 return -ENOMEM;
 378         }
 379
 380         inputdev->name = "Ideapad extra buttons";
 381         inputdev->phys = "ideapad/input0";
 382         inputdev->id.bustype = BUS_HOST;
 383         inputdev->dev.parent = &priv->platform_device->dev;
 384
 385         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 386         if (error) {
 387                 pr_err("Unable to setup input device keymap\n");
 388                 goto err_free_dev;
 389         }
 390
 391         error = input_register_device(inputdev);
 392         if (error) {
 393                 pr_err("Unable to register input device\n");
 394                 goto err_free_keymap;
 395         }
 396
 397         priv->inputdev = inputdev;
 398         return 0;
 399
 400 err_free_keymap:
 401         sparse_keymap_free(inputdev);
 402 err_free_dev:
 403         input_free_device(inputdev);
 404         return error;
 405 }
 406
 407 static void __devexit ideapad_input_exit(struct ideapad_private *priv)
 408 {
 409         sparse_keymap_free(priv->inputdev);
 410         input_unregister_device(priv->inputdev);
 411         priv->inputdev = NULL;
 412 }
 413
 414 static void ideapad_input_report(struct ideapad_private *priv,
 415                                  unsigned long scancode)
 416 {
 417         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 418 }
 419
 420 /*
 421  * module init/exit
 422  */
 423 static const struct acpi_device_id ideapad_device_ids[] = {
 424         { "VPC2004", 0},
 425         { "", 0},
 426 };
 427 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 428
 429 static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
 430 {
 431         int ret, i;
 432         unsigned long cfg;
 433         struct ideapad_private *priv;
 434
 435         if (read_method_int(adevice->handle, "_CFG", (int *)&cfg))
 436                 return -ENODEV;
 437
 438         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 439         if (!priv)
 440                 return -ENOMEM;
 441         dev_set_drvdata(&adevice->dev, priv);
 442         ideapad_handle = adevice->handle;
 443         priv->cfg = cfg;
 444
 445         ret = ideapad_platform_init(priv);
 446         if (ret)
 447                 goto platform_failed;
 448
 449         ret = ideapad_input_init(priv);
 450         if (ret)
 451                 goto input_failed;
 452
 453         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
 454                 if (test_bit(ideapad_rfk_data[i].cfgbit, &cfg))
 455                         ideapad_register_rfkill(adevice, i);
 456                 else
 457                         priv->rfk[i] = NULL;
 458         }
 459         ideapad_sync_rfk_state(adevice);
 460
 461         return 0;
 462
 463 input_failed:
 464         ideapad_platform_exit(priv);
 465 platform_failed:
 466         kfree(priv);
 467         return ret;
 468 }
 469
 470 static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
 471 {
 472         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 473         int i;
 474
 475         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 476                 ideapad_unregister_rfkill(adevice, i);
 477         ideapad_input_exit(priv);
 478         ideapad_platform_exit(priv);
 479         dev_set_drvdata(&adevice->dev, NULL);
 480         kfree(priv);
 481
 482         return 0;
 483 }
 484
 485 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 486 {
 487         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 488         acpi_handle handle = adevice->handle;
 489         unsigned long vpc1, vpc2, vpc_bit;
 490
 491         if (read_ec_data(handle, 0x10, &vpc1))
 492                 return;
 493         if (read_ec_data(handle, 0x1A, &vpc2))
 494                 return;
 495
 496         vpc1 = (vpc2 << 8) | vpc1;
 497         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 498                 if (test_bit(vpc_bit, &vpc1)) {
 499                         if (vpc_bit == 9)
 500                                 ideapad_sync_rfk_state(adevice);
 501                         else if (vpc_bit == 4)
 502                                 read_ec_data(handle, 0x12, &vpc2);
 503                         else
 504                                 ideapad_input_report(priv, vpc_bit);
 505                 }
 506         }
 507 }
 508
 509 static struct acpi_driver ideapad_acpi_driver = {
 510         .name = "ideapad_acpi",
 511         .class = "IdeaPad",
 512         .ids = ideapad_device_ids,
 513         .ops.add = ideapad_acpi_add,
 514         .ops.remove = ideapad_acpi_remove,
 515         .ops.notify = ideapad_acpi_notify,
 516         .owner = THIS_MODULE,
 517 };
 518
 519 static int __init ideapad_acpi_module_init(void)
 520 {
 521         return acpi_bus_register_driver(&ideapad_acpi_driver);
 522 }
 523
 524 static void __exit ideapad_acpi_module_exit(void)
 525 {
 526         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 527 }
 528
 529 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 530 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 531 MODULE_LICENSE("GPL");
 532
 533 module_init(ideapad_acpi_module_init);
 534 module_exit(ideapad_acpi_module_exit);