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