drivers/platform/x86/ideapad-laptop.c

   1 /*
   2  *  ideapad_acpi.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
  32 #define IDEAPAD_DEV_CAMERA      0
  33 #define IDEAPAD_DEV_WLAN        1
  34 #define IDEAPAD_DEV_BLUETOOTH   2
  35 #define IDEAPAD_DEV_3G          3
  36 #define IDEAPAD_DEV_KILLSW      4
  37
  38 struct ideapad_private {
  39         acpi_handle handle;
  40         struct rfkill *rfk[5];
  41         struct platform_device *platform_device;
  42 } *ideapad_priv;
  43
  44 static struct {
  45         char *name;
  46         int cfgbit;
  47         int opcode;
  48         int type;
  49 } ideapad_rfk_data[] = {
  50         { "ideapad_camera",     19, 0x1E, NUM_RFKILL_TYPES },
  51         { "ideapad_wlan",       18, 0x15, RFKILL_TYPE_WLAN },
  52         { "ideapad_bluetooth",  16, 0x17, RFKILL_TYPE_BLUETOOTH },
  53         { "ideapad_3g",         17, 0x20, RFKILL_TYPE_WWAN },
  54         { "ideapad_killsw",     0,  0,    RFKILL_TYPE_WLAN }
  55 };
  56
  57 static bool no_bt_rfkill;
  58 module_param(no_bt_rfkill, bool, 0444);
  59 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  60
  61 /*
  62  * ACPI Helpers
  63  */
  64 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  65
  66 static int read_method_int(acpi_handle handle, const char *method, int *val)
  67 {
  68         acpi_status status;
  69         unsigned long long result;
  70
  71         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  72         if (ACPI_FAILURE(status)) {
  73                 *val = -1;
  74                 return -1;
  75         } else {
  76                 *val = result;
  77                 return 0;
  78         }
  79 }
  80
  81 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
  82 {
  83         acpi_status status;
  84         unsigned long long result;
  85         struct acpi_object_list params;
  86         union acpi_object in_obj;
  87
  88         params.count = 1;
  89         params.pointer = &in_obj;
  90         in_obj.type = ACPI_TYPE_INTEGER;
  91         in_obj.integer.value = cmd;
  92
  93         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
  94
  95         if (ACPI_FAILURE(status)) {
  96                 *ret = -1;
  97                 return -1;
  98         } else {
  99                 *ret = result;
 100                 return 0;
 101         }
 102 }
 103
 104 static int method_vpcw(acpi_handle handle, int cmd, int data)
 105 {
 106         struct acpi_object_list params;
 107         union acpi_object in_obj[2];
 108         acpi_status status;
 109
 110         params.count = 2;
 111         params.pointer = in_obj;
 112         in_obj[0].type = ACPI_TYPE_INTEGER;
 113         in_obj[0].integer.value = cmd;
 114         in_obj[1].type = ACPI_TYPE_INTEGER;
 115         in_obj[1].integer.value = data;
 116
 117         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
 118         if (status != AE_OK)
 119                 return -1;
 120         return 0;
 121 }
 122
 123 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
 124 {
 125         int val;
 126         unsigned long int end_jiffies;
 127
 128         if (method_vpcw(handle, 1, cmd))
 129                 return -1;
 130
 131         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 132              time_before(jiffies, end_jiffies);) {
 133                 schedule();
 134                 if (method_vpcr(handle, 1, &val))
 135                         return -1;
 136                 if (val == 0) {
 137                         if (method_vpcr(handle, 0, &val))
 138                                 return -1;
 139                         *data = val;
 140                         return 0;
 141                 }
 142         }
 143         pr_err("timeout in read_ec_cmd\n");
 144         return -1;
 145 }
 146
 147 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 148 {
 149         int val;
 150         unsigned long int end_jiffies;
 151
 152         if (method_vpcw(handle, 0, data))
 153                 return -1;
 154         if (method_vpcw(handle, 1, cmd))
 155                 return -1;
 156
 157         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
 158              time_before(jiffies, end_jiffies);) {
 159                 schedule();
 160                 if (method_vpcr(handle, 1, &val))
 161                         return -1;
 162                 if (val == 0)
 163                         return 0;
 164         }
 165         pr_err("timeout in write_ec_cmd\n");
 166         return -1;
 167 }
 168 /* the above is ACPI helpers */
 169
 170 static ssize_t show_ideapad_cam(struct device *dev,
 171                                 struct device_attribute *attr,
 172                                 char *buf)
 173 {
 174         struct ideapad_private *priv = dev_get_drvdata(dev);
 175         acpi_handle handle = priv->handle;
 176         unsigned long result;
 177
 178         if (read_ec_data(handle, 0x1D, &result))
 179                 return sprintf(buf, "-1\n");
 180         return sprintf(buf, "%lu\n", result);
 181 }
 182
 183 static ssize_t store_ideapad_cam(struct device *dev,
 184                                  struct device_attribute *attr,
 185                                  const char *buf, size_t count)
 186 {
 187         struct ideapad_private *priv = dev_get_drvdata(dev);
 188         acpi_handle handle = priv->handle;
 189         int ret, state;
 190
 191         if (!count)
 192                 return 0;
 193         if (sscanf(buf, "%i", &state) != 1)
 194                 return -EINVAL;
 195         ret = write_ec_cmd(handle, 0x1E, state);
 196         if (ret < 0)
 197                 return ret;
 198         return count;
 199 }
 200
 201 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 202
 203 static int ideapad_rfk_set(void *data, bool blocked)
 204 {
 205         int device = (unsigned long)data;
 206
 207         if (device == IDEAPAD_DEV_KILLSW)
 208                 return -EINVAL;
 209
 210         return write_ec_cmd(ideapad_priv->handle,
 211                             ideapad_rfk_data[device].opcode,
 212                             !blocked);
 213 }
 214
 215 static struct rfkill_ops ideapad_rfk_ops = {
 216         .set_block = ideapad_rfk_set,
 217 };
 218
 219 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 220 {
 221         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 222         acpi_handle handle = priv->handle;
 223         unsigned long hw_blocked;
 224         int i;
 225
 226         if (read_ec_data(handle, 0x23, &hw_blocked))
 227                 return;
 228         hw_blocked = !hw_blocked;
 229
 230         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
 231                 if (priv->rfk[i])
 232                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 233 }
 234
 235 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
 236 {
 237         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 238         int ret;
 239         unsigned long sw_blocked;
 240
 241         if (no_bt_rfkill &&
 242             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
 243                 /* Force to enable bluetooth when no_bt_rfkill=1 */
 244                 write_ec_cmd(ideapad_priv->handle,
 245                              ideapad_rfk_data[dev].opcode, 1);
 246                 return 0;
 247         }
 248
 249         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
 250                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
 251                                       (void *)(long)dev);
 252         if (!priv->rfk[dev])
 253                 return -ENOMEM;
 254
 255         if (read_ec_data(ideapad_priv->handle, ideapad_rfk_data[dev].opcode-1,
 256                          &sw_blocked)) {
 257                 rfkill_init_sw_state(priv->rfk[dev], 0);
 258         } else {
 259                 sw_blocked = !sw_blocked;
 260                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
 261         }
 262
 263         ret = rfkill_register(priv->rfk[dev]);
 264         if (ret) {
 265                 rfkill_destroy(priv->rfk[dev]);
 266                 return ret;
 267         }
 268         return 0;
 269 }
 270
 271 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 272 {
 273         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 274
 275         if (!priv->rfk[dev])
 276                 return;
 277
 278         rfkill_unregister(priv->rfk[dev]);
 279         rfkill_destroy(priv->rfk[dev]);
 280 }
 281
 282 /*
 283  * Platform device
 284  */
 285 static struct attribute *ideapad_attributes[] = {
 286         &dev_attr_camera_power.attr,
 287         NULL
 288 };
 289
 290 static struct attribute_group ideapad_attribute_group = {
 291         .attrs = ideapad_attributes
 292 };
 293
 294 static int __devinit ideapad_platform_init(void)
 295 {
 296         int result;
 297
 298         ideapad_priv->platform_device = platform_device_alloc("ideapad", -1);
 299         if (!ideapad_priv->platform_device)
 300                 return -ENOMEM;
 301         platform_set_drvdata(ideapad_priv->platform_device, ideapad_priv);
 302
 303         result = platform_device_add(ideapad_priv->platform_device);
 304         if (result)
 305                 goto fail_platform_device;
 306
 307         result = sysfs_create_group(&ideapad_priv->platform_device->dev.kobj,
 308                                     &ideapad_attribute_group);
 309         if (result)
 310                 goto fail_sysfs;
 311         return 0;
 312
 313 fail_sysfs:
 314         platform_device_del(ideapad_priv->platform_device);
 315 fail_platform_device:
 316         platform_device_put(ideapad_priv->platform_device);
 317         return result;
 318 }
 319
 320 static void ideapad_platform_exit(void)
 321 {
 322         sysfs_remove_group(&ideapad_priv->platform_device->dev.kobj,
 323                            &ideapad_attribute_group);
 324         platform_device_unregister(ideapad_priv->platform_device);
 325 }
 326 /* the above is platform device */
 327
 328 static const struct acpi_device_id ideapad_device_ids[] = {
 329         { "VPC2004", 0},
 330         { "", 0},
 331 };
 332 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 333
 334 static int ideapad_acpi_add(struct acpi_device *adevice)
 335 {
 336         int ret, i, cfg;
 337         struct ideapad_private *priv;
 338
 339         if (read_method_int(adevice->handle, "_CFG", &cfg))
 340                 return -ENODEV;
 341
 342         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 343         if (!priv)
 344                 return -ENOMEM;
 345         ideapad_priv = priv;
 346         priv->handle = adevice->handle;
 347         dev_set_drvdata(&adevice->dev, priv);
 348
 349         ret = ideapad_platform_init();
 350         if (ret)
 351                 goto platform_failed;
 352
 353         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) {
 354                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
 355                         ideapad_register_rfkill(adevice, i);
 356         }
 357         ideapad_sync_rfk_state(adevice);
 358
 359         return 0;
 360
 361 platform_failed:
 362         kfree(priv);
 363         return ret;
 364 }
 365
 366 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
 367 {
 368         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 369         int i;
 370
 371         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 372                 ideapad_unregister_rfkill(adevice, i);
 373         ideapad_platform_exit();
 374         dev_set_drvdata(&adevice->dev, NULL);
 375         kfree(priv);
 376
 377         return 0;
 378 }
 379
 380 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 381 {
 382         acpi_handle handle = adevice->handle;
 383         unsigned long vpc1, vpc2, vpc_bit;
 384
 385         if (read_ec_data(handle, 0x10, &vpc1))
 386                 return;
 387         if (read_ec_data(handle, 0x1A, &vpc2))
 388                 return;
 389
 390         vpc1 = (vpc2 << 8) | vpc1;
 391         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 392                 if (test_bit(vpc_bit, &vpc1)) {
 393                         if (vpc_bit == 9)
 394                                 ideapad_sync_rfk_state(adevice);
 395                 }
 396         }
 397 }
 398
 399 static struct acpi_driver ideapad_acpi_driver = {
 400         .name = "ideapad_acpi",
 401         .class = "IdeaPad",
 402         .ids = ideapad_device_ids,
 403         .ops.add = ideapad_acpi_add,
 404         .ops.remove = ideapad_acpi_remove,
 405         .ops.notify = ideapad_acpi_notify,
 406         .owner = THIS_MODULE,
 407 };
 408
 409
 410 static int __init ideapad_acpi_module_init(void)
 411 {
 412         acpi_bus_register_driver(&ideapad_acpi_driver);
 413
 414         return 0;
 415 }
 416
 417
 418 static void __exit ideapad_acpi_module_exit(void)
 419 {
 420         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 421
 422 }
 423
 424 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 425 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 426 MODULE_LICENSE("GPL");
 427
 428 module_init(ideapad_acpi_module_init);
 429 module_exit(ideapad_acpi_module_exit);