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