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