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 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <acpi/acpi_bus.h>
  28 #include <acpi/acpi_drivers.h>
  29 #include <linux/rfkill.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/input.h>
  32 #include <linux/input/sparse-keymap.h>
  33
  34 #define IDEAPAD_RFKILL_DEV_NUM  (3)
  35
  36 struct ideapad_private {
  37         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  38         struct platform_device *platform_device;
  39         struct input_dev *inputdev;
  40 };
  41
  42 static acpi_handle ideapad_handle;
  43 static bool no_bt_rfkill;
  44 module_param(no_bt_rfkill, bool, 0444);
  45 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  46
  47 /*
  48  * ACPI Helpers
  49  */
  50 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  51
  52 static int read_method_int(acpi_handle handle, const char *method, int *val)
  53 {
  54         acpi_status status;
  55         unsigned long long result;
  56
  57         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  58         if (ACPI_FAILURE(status)) {
  59                 *val = -1;
  60                 return -1;
  61         } else {
  62                 *val = result;
  63                 return 0;
  64         }
  65 }
  66
  67 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
  68 {
  69         acpi_status status;
  70         unsigned long long result;
  71         struct acpi_object_list params;
  72         union acpi_object in_obj;
  73
  74         params.count = 1;
  75         params.pointer = &in_obj;
  76         in_obj.type = ACPI_TYPE_INTEGER;
  77         in_obj.integer.value = cmd;
  78
  79         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
  80
  81         if (ACPI_FAILURE(status)) {
  82                 *ret = -1;
  83                 return -1;
  84         } else {
  85                 *ret = result;
  86                 return 0;
  87         }
  88 }
  89
  90 static int method_vpcw(acpi_handle handle, int cmd, int data)
  91 {
  92         struct acpi_object_list params;
  93         union acpi_object in_obj[2];
  94         acpi_status status;
  95
  96         params.count = 2;
  97         params.pointer = in_obj;
  98         in_obj[0].type = ACPI_TYPE_INTEGER;
  99         in_obj[0].integer.value = cmd;
 100         in_obj[1].type = ACPI_TYPE_INTEGER;
 101         in_obj[1].integer.value = data;
 102
 103         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 104         if (status != AE_OK)
 105                 return -1;
 106         return 0;
 107 }
 108
 109 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 110 {
 111         int val;
 112         unsigned long int end_jiffies;
 113
 114         if (method_vpcw(handle, 1, cmd))
 115                 return -1;
 116
 117         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 118              time_before(jiffies, end_jiffies);) {
 119                 schedule();
 120                 if (method_vpcr(handle, 1, &val))
 121                         return -1;
 122                 if (val == 0) {
 123                         if (method_vpcr(handle, 0, &val))
 124                                 return -1;
 125                         *data = val;
 126                         return 0;
 127                 }
 128         }
 129         pr_err("timeout in read_ec_cmd\n");
 130         return -1;
 131 }
 132
 133 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 134 {
 135         int val;
 136         unsigned long int end_jiffies;
 137
 138         if (method_vpcw(handle, 0, data))
 139                 return -1;
 140         if (method_vpcw(handle, 1, cmd))
 141                 return -1;
 142
 143         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 144              time_before(jiffies, end_jiffies);) {
 145                 schedule();
 146                 if (method_vpcr(handle, 1, &val))
 147                         return -1;
 148                 if (val == 0)
 149                         return 0;
 150         }
 151         pr_err("timeout in write_ec_cmd\n");
 152         return -1;
 153 }
 154
 155 /*
 156  * camera power
 157  */
 158 static ssize_t show_ideapad_cam(struct device *dev,
 159                                 struct device_attribute *attr,
 160                                 char *buf)
 161 {
 162         unsigned long result;
 163
 164         if (read_ec_data(ideapad_handle, 0x1D, &result))
 165                 return sprintf(buf, "-1\n");
 166         return sprintf(buf, "%lu\n", result);
 167 }
 168
 169 static ssize_t store_ideapad_cam(struct device *dev,
 170                                  struct device_attribute *attr,
 171                                  const char *buf, size_t count)
 172 {
 173         int ret, state;
 174
 175         if (!count)
 176                 return 0;
 177         if (sscanf(buf, "%i", &state) != 1)
 178                 return -EINVAL;
 179         ret = write_ec_cmd(ideapad_handle, 0x1E, state);
 180         if (ret < 0)
 181                 return ret;
 182         return count;
 183 }
 184
 185 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 186
 187 /*
 188  * Rfkill
 189  */
 190 struct ideapad_rfk_data {
 191         char *name;
 192         int cfgbit;
 193         int opcode;
 194         int type;
 195 };
 196
 197 const struct ideapad_rfk_data ideapad_rfk_data[] = {
 198         { "ideapad_wlan",       18, 0x15, RFKILL_TYPE_WLAN },
 199         { "ideapad_bluetooth",  16, 0x17, RFKILL_TYPE_BLUETOOTH },
 200         { "ideapad_3g",         17, 0x20, RFKILL_TYPE_WWAN },
 201 };
 202
 203 static int ideapad_rfk_set(void *data, bool blocked)
 204 {
 205         unsigned long opcode = (unsigned long)data;
 206
 207         return write_ec_cmd(ideapad_handle, opcode, !blocked);
 208 }
 209
 210 static struct rfkill_ops ideapad_rfk_ops = {
 211         .set_block = ideapad_rfk_set,
 212 };
 213
 214 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 215 {
 216         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 217         unsigned long hw_blocked;
 218         int i;
 219
 220         if (read_ec_data(ideapad_handle, 0x23, &hw_blocked))
 221                 return;
 222         hw_blocked = !hw_blocked;
 223
 224         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 225                 if (priv->rfk[i])
 226                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 227 }
 228
 229 static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
 230                                              int dev)
 231 {
 232         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 233         int ret;
 234         unsigned long sw_blocked;
 235
 236         if (no_bt_rfkill &&
 237             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 238                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 239                 write_ec_cmd(ideapad_handle,
 240                              ideapad_rfk_data[dev].opcode, 1);
 241                 return 0;
 242         }
 243
 244         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 245                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 246                                       (void *)(long)dev);
 247         if (!priv->rfk[dev])
 248                 return -ENOMEM;
 249
 250         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
 251                          &sw_blocked)) {
 252                 rfkill_init_sw_state(priv->rfk[dev], 0);
 253         } else {
 254                 sw_blocked = !sw_blocked;
 255                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 256         }
 257
 258         ret = rfkill_register(priv->rfk[dev]);
 259         if (ret) {
 260                 rfkill_destroy(priv->rfk[dev]);
 261                 return ret;
 262         }
 263         return 0;
 264 }
 265
 266 static void __devexit ideapad_unregister_rfkill(struct acpi_device *adevice,
 267                                                 int dev)
 268 {
 269         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 270
 271         if (!priv->rfk[dev])
 272                 return;
 273
 274         rfkill_unregister(priv->rfk[dev]);
 275         rfkill_destroy(priv->rfk[dev]);
 276 }
 277
 278 /*
 279  * Platform device
 280  */
 281 static struct attribute *ideapad_attributes[] = {
 282         &dev_attr_camera_power.attr,
 283         NULL
 284 };
 285
 286 static struct attribute_group ideapad_attribute_group = {
 287         .attrs = ideapad_attributes
 288 };
 289
 290 static int __devinit ideapad_platform_init(struct ideapad_private *priv)
 291 {
 292         int result;
 293
 294         priv->platform_device = platform_device_alloc("ideapad", -1);
 295         if (!priv->platform_device)
 296                 return -ENOMEM;
 297         platform_set_drvdata(priv->platform_device, priv);
 298
 299         result = platform_device_add(priv->platform_device);
 300         if (result)
 301                 goto fail_platform_device;
 302
 303         result = sysfs_create_group(&priv->platform_device->dev.kobj,
 304                                     &ideapad_attribute_group);
 305         if (result)
 306                 goto fail_sysfs;
 307         return 0;
 308
 309 fail_sysfs:
 310         platform_device_del(priv->platform_device);
 311 fail_platform_device:
 312         platform_device_put(priv->platform_device);
 313         return result;
 314 }
 315
 316 static void ideapad_platform_exit(struct ideapad_private *priv)
 317 {
 318         sysfs_remove_group(&priv->platform_device->dev.kobj,
 319                            &ideapad_attribute_group);
 320         platform_device_unregister(priv->platform_device);
 321 }
 322
 323 /*
 324  * input device
 325  */
 326 static const struct key_entry ideapad_keymap[] = {
 327         { KE_KEY, 0x06, { KEY_SWITCHVIDEOMODE } },
 328         { KE_KEY, 0x0D, { KEY_WLAN } },
 329         { KE_END, 0 },
 330 };
 331
 332 static int __devinit ideapad_input_init(struct ideapad_private *priv)
 333 {
 334         struct input_dev *inputdev;
 335         int error;
 336
 337         inputdev = input_allocate_device();
 338         if (!inputdev) {
 339                 pr_info("Unable to allocate input device\n");
 340                 return -ENOMEM;
 341         }
 342
 343         inputdev->name = "Ideapad extra buttons";
 344         inputdev->phys = "ideapad/input0";
 345         inputdev->id.bustype = BUS_HOST;
 346         inputdev->dev.parent = &priv->platform_device->dev;
 347
 348         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
 349         if (error) {
 350                 pr_err("Unable to setup input device keymap\n");
 351                 goto err_free_dev;
 352         }
 353
 354         error = input_register_device(inputdev);
 355         if (error) {
 356                 pr_err("Unable to register input device\n");
 357                 goto err_free_keymap;
 358         }
 359
 360         priv->inputdev = inputdev;
 361         return 0;
 362
 363 err_free_keymap:
 364         sparse_keymap_free(inputdev);
 365 err_free_dev:
 366         input_free_device(inputdev);
 367         return error;
 368 }
 369
 370 static void __devexit ideapad_input_exit(struct ideapad_private *priv)
 371 {
 372         sparse_keymap_free(priv->inputdev);
 373         input_unregister_device(priv->inputdev);
 374         priv->inputdev = NULL;
 375 }
 376
 377 static void ideapad_input_report(struct ideapad_private *priv,
 378                                  unsigned long scancode)
 379 {
 380         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
 381 }
 382
 383 /*
 384  * module init/exit
 385  */
 386 static const struct acpi_device_id ideapad_device_ids[] = {
 387         { "VPC2004", 0},
 388         { "", 0},
 389 };
 390 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 391
 392 static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
 393 {
 394         int ret, i, cfg;
 395         struct ideapad_private *priv;
 396
 397         if (read_method_int(adevice->handle, "_CFG", &cfg))
 398                 return -ENODEV;
 399
 400         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 401         if (!priv)
 402                 return -ENOMEM;
 403         dev_set_drvdata(&adevice->dev, priv);
 404         ideapad_handle = adevice->handle;
 405
 406         ret = ideapad_platform_init(priv);
 407         if (ret)
 408                 goto platform_failed;
 409
 410         ret = ideapad_input_init(priv);
 411         if (ret)
 412                 goto input_failed;
 413
 414         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
 415                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
 416                         ideapad_register_rfkill(adevice, i);
 417                 else
 418                         priv->rfk[i] = NULL;
 419         }
 420         ideapad_sync_rfk_state(adevice);
 421
 422         return 0;
 423
 424 input_failed:
 425         ideapad_platform_exit(priv);
 426 platform_failed:
 427         kfree(priv);
 428         return ret;
 429 }
 430
 431 static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
 432 {
 433         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 434         int i;
 435
 436         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
 437                 ideapad_unregister_rfkill(adevice, i);
 438         ideapad_input_exit(priv);
 439         ideapad_platform_exit(priv);
 440         dev_set_drvdata(&adevice->dev, NULL);
 441         kfree(priv);
 442
 443         return 0;
 444 }
 445
 446 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 447 {
 448         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 449         acpi_handle handle = adevice->handle;
 450         unsigned long vpc1, vpc2, vpc_bit;
 451
 452         if (read_ec_data(handle, 0x10, &vpc1))
 453                 return;
 454         if (read_ec_data(handle, 0x1A, &vpc2))
 455                 return;
 456
 457         vpc1 = (vpc2 << 8) | vpc1;
 458         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 459                 if (test_bit(vpc_bit, &vpc1)) {
 460                         if (vpc_bit == 9)
 461                                 ideapad_sync_rfk_state(adevice);
 462                         else
 463                                 ideapad_input_report(priv, vpc_bit);
 464                 }
 465         }
 466 }
 467
 468 static struct acpi_driver ideapad_acpi_driver = {
 469         .name = "ideapad_acpi",
 470         .class = "IdeaPad",
 471         .ids = ideapad_device_ids,
 472         .ops.add = ideapad_acpi_add,
 473         .ops.remove = ideapad_acpi_remove,
 474         .ops.notify = ideapad_acpi_notify,
 475         .owner = THIS_MODULE,
 476 };
 477
 478 static int __init ideapad_acpi_module_init(void)
 479 {
 480         return acpi_bus_register_driver(&ideapad_acpi_driver);
 481 }
 482
 483 static void __exit ideapad_acpi_module_exit(void)
 484 {
 485         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 486 }
 487
 488 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 489 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 490 MODULE_LICENSE("GPL");
 491
 492 module_init(ideapad_acpi_module_init);
 493 module_exit(ideapad_acpi_module_exit);