drivers/platform/x86/ideapad_acpi.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
  31 #define IDEAPAD_DEV_CAMERA      0
  32 #define IDEAPAD_DEV_WLAN        1
  33 #define IDEAPAD_DEV_BLUETOOTH   2
  34 #define IDEAPAD_DEV_3G          3
  35 #define IDEAPAD_DEV_KILLSW      4
  36
  37 struct ideapad_private {
  38         acpi_handle handle;
  39         struct rfkill *rfk[5];
  40 };
  41
  42 static struct {
  43         char *name;
  44         int cfgbit;
  45         int type;
  46 } ideapad_rfk_data[] = {
  47         { "ideapad_camera",     19, NUM_RFKILL_TYPES },
  48         { "ideapad_wlan",       18, RFKILL_TYPE_WLAN },
  49         { "ideapad_bluetooth",  16, RFKILL_TYPE_BLUETOOTH },
  50         { "ideapad_3g",         17, RFKILL_TYPE_WWAN },
  51         { "ideapad_killsw",     0, RFKILL_TYPE_WLAN }
  52 };
  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 /* the above is ACPI helpers */
 162
 163 static int ideapad_dev_get_state(int device)
 164 {
 165         acpi_status status;
 166         union acpi_object in_param;
 167         struct acpi_object_list input = { 1, &in_param };
 168         struct acpi_buffer output;
 169         union acpi_object out_obj;
 170
 171         output.length = sizeof(out_obj);
 172         output.pointer = &out_obj;
 173
 174         in_param.type = ACPI_TYPE_INTEGER;
 175         in_param.integer.value = device + 1;
 176
 177         status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
 178         if (ACPI_FAILURE(status)) {
 179                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
 180                 return -ENODEV;
 181         }
 182         if (out_obj.type != ACPI_TYPE_INTEGER) {
 183                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
 184                 return -ENODEV;
 185         }
 186         return out_obj.integer.value;
 187 }
 188
 189 static int ideapad_dev_set_state(int device, int state)
 190 {
 191         acpi_status status;
 192         union acpi_object in_params[2];
 193         struct acpi_object_list input = { 2, in_params };
 194
 195         in_params[0].type = ACPI_TYPE_INTEGER;
 196         in_params[0].integer.value = device + 1;
 197         in_params[1].type = ACPI_TYPE_INTEGER;
 198         in_params[1].integer.value = state;
 199
 200         status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
 201         if (ACPI_FAILURE(status)) {
 202                 printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
 203                 return -ENODEV;
 204         }
 205         return 0;
 206 }
 207 static ssize_t show_ideapad_cam(struct device *dev,
 208                                 struct device_attribute *attr,
 209                                 char *buf)
 210 {
 211         struct ideapad_private *priv = dev_get_drvdata(dev);
 212         acpi_handle handle = priv->handle;
 213         unsigned long result;
 214
 215         if (read_ec_data(handle, 0x1D, &result))
 216                 return sprintf(buf, "-1\n");
 217         return sprintf(buf, "%lu\n", result);
 218 }
 219
 220 static ssize_t store_ideapad_cam(struct device *dev,
 221                                  struct device_attribute *attr,
 222                                  const char *buf, size_t count)
 223 {
 224         struct ideapad_private *priv = dev_get_drvdata(dev);
 225         acpi_handle handle = priv->handle;
 226         int ret, state;
 227
 228         if (!count)
 229                 return 0;
 230         if (sscanf(buf, "%i", &state) != 1)
 231                 return -EINVAL;
 232         ret = write_ec_cmd(handle, 0x1E, state);
 233         if (ret < 0)
 234                 return ret;
 235         return count;
 236 }
 237
 238 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 239
 240 static int ideapad_rfk_set(void *data, bool blocked)
 241 {
 242         int device = (unsigned long)data;
 243
 244         if (device == IDEAPAD_DEV_KILLSW)
 245                 return -EINVAL;
 246         return ideapad_dev_set_state(device, !blocked);
 247 }
 248
 249 static struct rfkill_ops ideapad_rfk_ops = {
 250         .set_block = ideapad_rfk_set,
 251 };
 252
 253 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 254 {
 255         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 256         int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
 257         int i;
 258
 259         rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], hw_blocked);
 260         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 261                 if (priv->rfk[i])
 262                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 263         if (hw_blocked)
 264                 return;
 265
 266         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 267                 if (priv->rfk[i])
 268                         rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
 269 }
 270
 271 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
 272 {
 273         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 274         int ret;
 275
 276         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
 277                                       ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
 278                                       (void *)(long)dev);
 279         if (!priv->rfk[dev])
 280                 return -ENOMEM;
 281
 282         ret = rfkill_register(priv->rfk[dev]);
 283         if (ret) {
 284                 rfkill_destroy(priv->rfk[dev]);
 285                 return ret;
 286         }
 287         return 0;
 288 }
 289
 290 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 291 {
 292         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 293
 294         if (!priv->rfk[dev])
 295                 return;
 296
 297         rfkill_unregister(priv->rfk[dev]);
 298         rfkill_destroy(priv->rfk[dev]);
 299 }
 300
 301 static const struct acpi_device_id ideapad_device_ids[] = {
 302         { "VPC2004", 0},
 303         { "", 0},
 304 };
 305 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 306
 307 static int ideapad_acpi_add(struct acpi_device *adevice)
 308 {
 309         int i, cfg;
 310         int devs_present[5];
 311         struct ideapad_private *priv;
 312
 313         if (read_method_int(adevice->handle, "_CFG", &cfg))
 314                 return -ENODEV;
 315
 316         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 317                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
 318                         devs_present[i] = 1;
 319                 else
 320                         devs_present[i] = 0;
 321         }
 322
 323         /* The hardware switch is always present */
 324         devs_present[IDEAPAD_DEV_KILLSW] = 1;
 325
 326         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 327         if (!priv)
 328                 return -ENOMEM;
 329
 330         if (devs_present[IDEAPAD_DEV_CAMERA]) {
 331                 int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
 332                 if (ret) {
 333                         kfree(priv);
 334                         return ret;
 335                 }
 336         }
 337
 338         priv->handle = adevice->handle;
 339         dev_set_drvdata(&adevice->dev, priv);
 340         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
 341                 if (!devs_present[i])
 342                         continue;
 343
 344                 ideapad_register_rfkill(adevice, i);
 345         }
 346         ideapad_sync_rfk_state(adevice);
 347         return 0;
 348 }
 349
 350 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
 351 {
 352         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 353         int i;
 354
 355         device_remove_file(&adevice->dev, &dev_attr_camera_power);
 356
 357         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
 358                 ideapad_unregister_rfkill(adevice, i);
 359
 360         dev_set_drvdata(&adevice->dev, NULL);
 361         kfree(priv);
 362         return 0;
 363 }
 364
 365 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 366 {
 367         acpi_handle handle = adevice->handle;
 368         unsigned long vpc1, vpc2, vpc_bit;
 369
 370         if (read_ec_data(handle, 0x10, &vpc1))
 371                 return;
 372         if (read_ec_data(handle, 0x1A, &vpc2))
 373                 return;
 374
 375         vpc1 = (vpc2 << 8) | vpc1;
 376         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
 377                 if (test_bit(vpc_bit, &vpc1)) {
 378                         if (vpc_bit == 9)
 379                                 ideapad_sync_rfk_state(adevice);
 380                 }
 381         }
 382 }
 383
 384 static struct acpi_driver ideapad_acpi_driver = {
 385         .name = "ideapad_acpi",
 386         .class = "IdeaPad",
 387         .ids = ideapad_device_ids,
 388         .ops.add = ideapad_acpi_add,
 389         .ops.remove = ideapad_acpi_remove,
 390         .ops.notify = ideapad_acpi_notify,
 391         .owner = THIS_MODULE,
 392 };
 393
 394
 395 static int __init ideapad_acpi_module_init(void)
 396 {
 397         acpi_bus_register_driver(&ideapad_acpi_driver);
 398
 399         return 0;
 400 }
 401
 402
 403 static void __exit ideapad_acpi_module_exit(void)
 404 {
 405         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 406
 407 }
 408
 409 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 410 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 411 MODULE_LICENSE("GPL");
 412
 413 module_init(ideapad_acpi_module_init);
 414 module_exit(ideapad_acpi_module_exit);