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         struct rfkill *rfk[5];
  39 };
  40
  41 static struct {
  42         char *name;
  43         int type;
  44 } ideapad_rfk_data[] = {
  45         /* camera has no rfkill */
  46         { "ideapad_wlan",       RFKILL_TYPE_WLAN },
  47         { "ideapad_bluetooth",  RFKILL_TYPE_BLUETOOTH },
  48         { "ideapad_3g",         RFKILL_TYPE_WWAN },
  49         { "ideapad_killsw",     RFKILL_TYPE_WLAN }
  50 };
  51
  52 static int ideapad_dev_exists(int device)
  53 {
  54         acpi_status status;
  55         union acpi_object in_param;
  56         struct acpi_object_list input = { 1, &in_param };
  57         struct acpi_buffer output;
  58         union acpi_object out_obj;
  59
  60         output.length = sizeof(out_obj);
  61         output.pointer = &out_obj;
  62
  63         in_param.type = ACPI_TYPE_INTEGER;
  64         in_param.integer.value = device + 1;
  65
  66         status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
  67         if (ACPI_FAILURE(status)) {
  68                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
  69                 return -ENODEV;
  70         }
  71         if (out_obj.type != ACPI_TYPE_INTEGER) {
  72                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
  73                 return -ENODEV;
  74         }
  75         return out_obj.integer.value;
  76 }
  77
  78 static int ideapad_dev_get_state(int device)
  79 {
  80         acpi_status status;
  81         union acpi_object in_param;
  82         struct acpi_object_list input = { 1, &in_param };
  83         struct acpi_buffer output;
  84         union acpi_object out_obj;
  85
  86         output.length = sizeof(out_obj);
  87         output.pointer = &out_obj;
  88
  89         in_param.type = ACPI_TYPE_INTEGER;
  90         in_param.integer.value = device + 1;
  91
  92         status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
  93         if (ACPI_FAILURE(status)) {
  94                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
  95                 return -ENODEV;
  96         }
  97         if (out_obj.type != ACPI_TYPE_INTEGER) {
  98                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
  99                 return -ENODEV;
 100         }
 101         return out_obj.integer.value;
 102 }
 103
 104 static int ideapad_dev_set_state(int device, int state)
 105 {
 106         acpi_status status;
 107         union acpi_object in_params[2];
 108         struct acpi_object_list input = { 2, in_params };
 109
 110         in_params[0].type = ACPI_TYPE_INTEGER;
 111         in_params[0].integer.value = device + 1;
 112         in_params[1].type = ACPI_TYPE_INTEGER;
 113         in_params[1].integer.value = state;
 114
 115         status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
 116         if (ACPI_FAILURE(status)) {
 117                 printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
 118                 return -ENODEV;
 119         }
 120         return 0;
 121 }
 122 static ssize_t show_ideapad_cam(struct device *dev,
 123                                 struct device_attribute *attr,
 124                                 char *buf)
 125 {
 126         int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
 127         if (state < 0)
 128                 return state;
 129
 130         return sprintf(buf, "%d\n", state);
 131 }
 132
 133 static ssize_t store_ideapad_cam(struct device *dev,
 134                                  struct device_attribute *attr,
 135                                  const char *buf, size_t count)
 136 {
 137         int ret, state;
 138
 139         if (!count)
 140                 return 0;
 141         if (sscanf(buf, "%i", &state) != 1)
 142                 return -EINVAL;
 143         ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, !!state);
 144         if (ret < 0)
 145                 return ret;
 146         return count;
 147 }
 148
 149 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 150
 151 static int ideapad_rfk_set(void *data, bool blocked)
 152 {
 153         int device = (unsigned long)data;
 154
 155         if (device == IDEAPAD_DEV_KILLSW)
 156                 return -EINVAL;
 157         return ideapad_dev_set_state(device, !blocked);
 158 }
 159
 160 static struct rfkill_ops ideapad_rfk_ops = {
 161         .set_block = ideapad_rfk_set,
 162 };
 163
 164 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
 165 {
 166         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 167         int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
 168         int i;
 169
 170         rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], hw_blocked);
 171         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 172                 if (priv->rfk[i])
 173                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
 174         if (hw_blocked)
 175                 return;
 176
 177         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 178                 if (priv->rfk[i])
 179                         rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
 180 }
 181
 182 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
 183 {
 184         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 185         int ret;
 186
 187         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
 188                                       ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
 189                                       (void *)(long)dev);
 190         if (!priv->rfk[dev])
 191                 return -ENOMEM;
 192
 193         ret = rfkill_register(priv->rfk[dev]);
 194         if (ret) {
 195                 rfkill_destroy(priv->rfk[dev]);
 196                 return ret;
 197         }
 198         return 0;
 199 }
 200
 201 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
 202 {
 203         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 204
 205         if (!priv->rfk[dev])
 206                 return;
 207
 208         rfkill_unregister(priv->rfk[dev]);
 209         rfkill_destroy(priv->rfk[dev]);
 210 }
 211
 212 static const struct acpi_device_id ideapad_device_ids[] = {
 213         { "VPC2004", 0},
 214         { "", 0},
 215 };
 216 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 217
 218 static int ideapad_acpi_add(struct acpi_device *adevice)
 219 {
 220         int i;
 221         int devs_present[5];
 222         struct ideapad_private *priv;
 223
 224         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 225                 devs_present[i] = ideapad_dev_exists(i);
 226                 if (devs_present[i] < 0)
 227                         return devs_present[i];
 228         }
 229
 230         /* The hardware switch is always present */
 231         devs_present[IDEAPAD_DEV_KILLSW] = 1;
 232
 233         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 234         if (!priv)
 235                 return -ENOMEM;
 236
 237         if (devs_present[IDEAPAD_DEV_CAMERA]) {
 238                 int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
 239                 if (ret) {
 240                         kfree(priv);
 241                         return ret;
 242                 }
 243         }
 244
 245         dev_set_drvdata(&adevice->dev, priv);
 246         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
 247                 if (!devs_present[i])
 248                         continue;
 249
 250                 ideapad_register_rfkill(adevice, i);
 251         }
 252         ideapad_sync_rfk_state(adevice);
 253         return 0;
 254 }
 255
 256 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
 257 {
 258         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
 259         int i;
 260
 261         device_remove_file(&adevice->dev, &dev_attr_camera_power);
 262
 263         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
 264                 ideapad_unregister_rfkill(adevice, i);
 265
 266         dev_set_drvdata(&adevice->dev, NULL);
 267         kfree(priv);
 268         return 0;
 269 }
 270
 271 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
 272 {
 273         ideapad_sync_rfk_state(adevice);
 274 }
 275
 276 static struct acpi_driver ideapad_acpi_driver = {
 277         .name = "ideapad_acpi",
 278         .class = "IdeaPad",
 279         .ids = ideapad_device_ids,
 280         .ops.add = ideapad_acpi_add,
 281         .ops.remove = ideapad_acpi_remove,
 282         .ops.notify = ideapad_acpi_notify,
 283         .owner = THIS_MODULE,
 284 };
 285
 286
 287 static int __init ideapad_acpi_module_init(void)
 288 {
 289         acpi_bus_register_driver(&ideapad_acpi_driver);
 290
 291         return 0;
 292 }
 293
 294
 295 static void __exit ideapad_acpi_module_exit(void)
 296 {
 297         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 298
 299 }
 300
 301 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 302 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 303 MODULE_LICENSE("GPL");
 304
 305 module_init(ideapad_acpi_module_init);
 306 module_exit(ideapad_acpi_module_exit);