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 static struct rfkill *ideapad_rfkill[5];
  38
  39 static const char *ideapad_rfk_names[] = {
  40         "ideapad_camera", "ideapad_wlan", "ideapad_bluetooth", "ideapad_3g", "ideapad_rfkill"
  41 };
  42 static const int ideapad_rfk_types[] = {
  43         0, RFKILL_TYPE_WLAN, RFKILL_TYPE_BLUETOOTH, RFKILL_TYPE_WWAN, RFKILL_TYPE_WLAN
  44 };
  45
  46 static int ideapad_dev_exists(int device)
  47 {
  48         acpi_status status;
  49         union acpi_object in_param;
  50         struct acpi_object_list input = { 1, &in_param };
  51         struct acpi_buffer output;
  52         union acpi_object out_obj;
  53
  54         output.length = sizeof(out_obj);
  55         output.pointer = &out_obj;
  56
  57         in_param.type = ACPI_TYPE_INTEGER;
  58         in_param.integer.value = device + 1;
  59
  60         status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
  61         if (ACPI_FAILURE(status)) {
  62                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
  63                 return -ENODEV;
  64         }
  65         if (out_obj.type != ACPI_TYPE_INTEGER) {
  66                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
  67                 return -ENODEV;
  68         }
  69         return out_obj.integer.value;
  70 }
  71
  72 static int ideapad_dev_get_state(int device)
  73 {
  74         acpi_status status;
  75         union acpi_object in_param;
  76         struct acpi_object_list input = { 1, &in_param };
  77         struct acpi_buffer output;
  78         union acpi_object out_obj;
  79
  80         output.length = sizeof(out_obj);
  81         output.pointer = &out_obj;
  82
  83         in_param.type = ACPI_TYPE_INTEGER;
  84         in_param.integer.value = device + 1;
  85
  86         status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
  87         if (ACPI_FAILURE(status)) {
  88                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
  89                 return -ENODEV;
  90         }
  91         if (out_obj.type != ACPI_TYPE_INTEGER) {
  92                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
  93                 return -ENODEV;
  94         }
  95         return out_obj.integer.value;
  96 }
  97
  98 static int ideapad_dev_set_state(int device, int state)
  99 {
 100         acpi_status status;
 101         union acpi_object in_params[2];
 102         struct acpi_object_list input = { 2, in_params };
 103
 104         in_params[0].type = ACPI_TYPE_INTEGER;
 105         in_params[0].integer.value = device + 1;
 106         in_params[1].type = ACPI_TYPE_INTEGER;
 107         in_params[1].integer.value = state;
 108
 109         status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
 110         if (ACPI_FAILURE(status)) {
 111                 printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
 112                 return -ENODEV;
 113         }
 114         return 0;
 115 }
 116 static ssize_t show_ideapad_cam(struct device *dev,
 117                                 struct device_attribute *attr,
 118                                 char *buf)
 119 {
 120         int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
 121         if (state < 0)
 122                 return state;
 123
 124         return sprintf(buf, "%d\n", state);
 125 }
 126
 127 static ssize_t store_ideapad_cam(struct device *dev,
 128                                  struct device_attribute *attr,
 129                                  const char *buf, size_t count)
 130 {
 131         int ret, state;
 132
 133         if (!count)
 134                 return 0;
 135         if (sscanf(buf, "%i", &state) != 1)
 136                 return -EINVAL;
 137         ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state);
 138         if (ret < 0)
 139                 return ret;
 140         return count;
 141 }
 142
 143 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
 144
 145 static int ideapad_rfk_set(void *data, bool blocked)
 146 {
 147         int device = (unsigned long)data;
 148
 149         if (device == IDEAPAD_DEV_KILLSW)
 150                 return -EINVAL;
 151         return ideapad_dev_set_state(device, !blocked);
 152 }
 153
 154 static struct rfkill_ops ideapad_rfk_ops = {
 155         .set_block = ideapad_rfk_set,
 156 };
 157
 158 static void ideapad_sync_rfk_state(void)
 159 {
 160         int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
 161         int i;
 162
 163         rfkill_set_hw_state(ideapad_rfkill[IDEAPAD_DEV_KILLSW], hw_blocked);
 164         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 165                 if (ideapad_rfkill[i])
 166                         rfkill_set_hw_state(ideapad_rfkill[i], hw_blocked);
 167         if (hw_blocked)
 168                 return;
 169
 170         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
 171                 if (ideapad_rfkill[i])
 172                         rfkill_set_sw_state(ideapad_rfkill[i], !ideapad_dev_get_state(i));
 173 }
 174
 175 static int ideapad_register_rfkill(struct acpi_device *device, int dev)
 176 {
 177         int ret;
 178
 179         ideapad_rfkill[dev] = rfkill_alloc(ideapad_rfk_names[dev], &device->dev,
 180                                            ideapad_rfk_types[dev], &ideapad_rfk_ops,
 181                                            (void *)(long)dev);
 182         if (!ideapad_rfkill[dev])
 183                 return -ENOMEM;
 184
 185         ret = rfkill_register(ideapad_rfkill[dev]);
 186         if (ret) {
 187                 rfkill_destroy(ideapad_rfkill[dev]);
 188                 return ret;
 189         }
 190         return 0;
 191 }
 192
 193 static void ideapad_unregister_rfkill(int dev)
 194 {
 195         if (!ideapad_rfkill[dev])
 196                 return;
 197
 198         rfkill_unregister(ideapad_rfkill[dev]);
 199         rfkill_destroy(ideapad_rfkill[dev]);
 200 }
 201
 202 static const struct acpi_device_id ideapad_device_ids[] = {
 203         { "VPC2004", 0},
 204         { "", 0},
 205 };
 206 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 207
 208 static int ideapad_acpi_add(struct acpi_device *device)
 209 {
 210         int i;
 211         int devs_present[5];
 212
 213         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 214                 devs_present[i] = ideapad_dev_exists(i);
 215                 if (devs_present[i] < 0)
 216                         return devs_present[i];
 217         }
 218
 219         /* The hardware switch is always present */
 220         devs_present[IDEAPAD_DEV_KILLSW] = 1;
 221
 222         if (devs_present[IDEAPAD_DEV_CAMERA]) {
 223                 int ret = device_create_file(&device->dev, &dev_attr_camera_power);
 224                 if (ret)
 225                         return ret;
 226         }
 227
 228         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
 229                 if (!devs_present[i])
 230                         continue;
 231
 232                 ideapad_register_rfkill(device, i);
 233         }
 234         ideapad_sync_rfk_state();
 235         return 0;
 236 }
 237
 238 static int ideapad_acpi_remove(struct acpi_device *device, int type)
 239 {
 240         int i;
 241         device_remove_file(&device->dev, &dev_attr_camera_power);
 242         for (i = 0; i < 5; i++)
 243                 ideapad_unregister_rfkill(i);
 244         return 0;
 245 }
 246
 247 static void ideapad_acpi_notify(struct acpi_device *device, u32 event)
 248 {
 249         ideapad_sync_rfk_state();
 250 }
 251
 252 static struct acpi_driver ideapad_acpi_driver = {
 253         .name = "ideapad_acpi",
 254         .class = "IdeaPad",
 255         .ids = ideapad_device_ids,
 256         .ops.add = ideapad_acpi_add,
 257         .ops.remove = ideapad_acpi_remove,
 258         .ops.notify = ideapad_acpi_notify,
 259         .owner = THIS_MODULE,
 260 };
 261
 262
 263 static int __init ideapad_acpi_module_init(void)
 264 {
 265         acpi_bus_register_driver(&ideapad_acpi_driver);
 266
 267         return 0;
 268 }
 269
 270
 271 static void __exit ideapad_acpi_module_exit(void)
 272 {
 273         acpi_bus_unregister_driver(&ideapad_acpi_driver);
 274
 275 }
 276
 277 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 278 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
 279 MODULE_LICENSE("GPL");
 280
 281 module_init(ideapad_acpi_module_init);
 282 module_exit(ideapad_acpi_module_exit);