drivers/misc/tc1100-wmi.c

   1 /*
   2  *  HP Compaq TC1100 Tablet WMI Extras Driver
   3  *
   4  *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
   5  *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <acpi/acpi.h>
  33 #include <acpi/actypes.h>
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36 #include <linux/platform_device.h>
  37
  38 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
  39
  40 #define TC1100_INSTANCE_WIRELESS                1
  41 #define TC1100_INSTANCE_JOGDIAL         2
  42
  43 #define TC1100_LOGPREFIX "tc1100-wmi: "
  44 #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
  45
  46 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  47 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  48 MODULE_LICENSE("GPL");
  49 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  50
  51 static int tc1100_probe(struct platform_device *device);
  52 static int tc1100_remove(struct platform_device *device);
  53 static int tc1100_suspend(struct platform_device *device, pm_message_t state);
  54 static int tc1100_resume(struct platform_device *device);
  55
  56 static struct platform_driver tc1100_driver = {
  57         .driver = {
  58                 .name = "tc1100-wmi",
  59                 .owner = THIS_MODULE,
  60         },
  61         .probe = tc1100_probe,
  62         .remove = tc1100_remove,
  63         .suspend = tc1100_suspend,
  64         .resume = tc1100_resume,
  65 };
  66
  67 static struct platform_device *tc1100_device;
  68
  69 struct tc1100_data {
  70         u32 wireless;
  71         u32 jogdial;
  72 };
  73
  74 static struct tc1100_data suspend_data;
  75
  76 /* --------------------------------------------------------------------------
  77                                 Device Management
  78    -------------------------------------------------------------------------- */
  79
  80 static int get_state(u32 *out, u8 instance)
  81 {
  82         u32 tmp;
  83         acpi_status status;
  84         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  85         union acpi_object *obj;
  86
  87         if (!out)
  88                 return -EINVAL;
  89
  90         if (instance > 2)
  91                 return -ENODEV;
  92
  93         status = wmi_query_block(GUID, instance, &result);
  94         if (ACPI_FAILURE(status))
  95                 return -ENODEV;
  96
  97         obj = (union acpi_object *) result.pointer;
  98         if (obj && obj->type == ACPI_TYPE_BUFFER &&
  99                 obj->buffer.length == sizeof(u32)) {
 100                 tmp = *((u32 *) obj->buffer.pointer);
 101         } else {
 102                 tmp = 0;
 103         }
 104
 105         if (result.length > 0 && result.pointer)
 106                 kfree(result.pointer);
 107
 108         switch (instance) {
 109         case TC1100_INSTANCE_WIRELESS:
 110                 *out = (tmp == 3) ? 1 : 0;
 111                 return 0;
 112         case TC1100_INSTANCE_JOGDIAL:
 113                 *out = (tmp == 1) ? 1 : 0;
 114                 return 0;
 115         default:
 116                 return -ENODEV;
 117         }
 118 }
 119
 120 static int set_state(u32 *in, u8 instance)
 121 {
 122         u32 value;
 123         acpi_status status;
 124         struct acpi_buffer input;
 125
 126         if (!in)
 127                 return -EINVAL;
 128
 129         if (instance > 2)
 130                 return -ENODEV;
 131
 132         switch (instance) {
 133         case TC1100_INSTANCE_WIRELESS:
 134                 value = (*in) ? 1 : 2;
 135                 break;
 136         case TC1100_INSTANCE_JOGDIAL:
 137                 value = (*in) ? 0 : 1;
 138                 break;
 139         default:
 140                 return -ENODEV;
 141         }
 142
 143         input.length = sizeof(u32);
 144         input.pointer = &value;
 145
 146         status = wmi_set_block(GUID, instance, &input);
 147         if (ACPI_FAILURE(status))
 148                 return -ENODEV;
 149
 150         return 0;
 151 }
 152
 153 /* --------------------------------------------------------------------------
 154                                 FS Interface (/sys)
 155    -------------------------------------------------------------------------- */
 156
 157 /*
 158  * Read/ write bool sysfs macro
 159  */
 160 #define show_set_bool(value, instance) \
 161 static ssize_t \
 162 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 163         char *buf) \
 164 { \
 165         u32 result; \
 166         acpi_status status = get_state(&result, instance); \
 167         if (ACPI_SUCCESS(status)) \
 168                 return sprintf(buf, "%d\n", result); \
 169         return sprintf(buf, "Read error\n"); \
 170 } \
 171 \
 172 static ssize_t \
 173 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 174         const char *buf, size_t count) \
 175 { \
 176         u32 tmp = simple_strtoul(buf, NULL, 10); \
 177         acpi_status status = set_state(&tmp, instance); \
 178                 if (ACPI_FAILURE(status)) \
 179                         return -EINVAL; \
 180         return count; \
 181 } \
 182 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
 183         show_bool_##value, set_bool_##value);
 184
 185 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 186 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 187
 188 static void remove_fs(void)
 189 {
 190         device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
 191         device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
 192 }
 193
 194 static int add_fs(void)
 195 {
 196         int ret;
 197
 198         ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
 199         if (ret)
 200                 goto add_sysfs_error;
 201
 202         ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
 203         if (ret)
 204                 goto add_sysfs_error;
 205
 206         return ret;
 207
 208 add_sysfs_error:
 209         remove_fs();
 210         return ret;
 211 }
 212
 213 /* --------------------------------------------------------------------------
 214                                 Driver Model
 215    -------------------------------------------------------------------------- */
 216
 217 static int tc1100_probe(struct platform_device *device)
 218 {
 219         int result = 0;
 220
 221         result = add_fs();
 222         return result;
 223 }
 224
 225
 226 static int tc1100_remove(struct platform_device *device)
 227 {
 228         remove_fs();
 229         return 0;
 230 }
 231
 232 static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
 233 {
 234         int ret;
 235
 236         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 237         if (ret)
 238                 return ret;
 239
 240         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 241         if (ret)
 242                 return ret;
 243
 244         return ret;
 245 }
 246
 247 static int tc1100_resume(struct platform_device *dev)
 248 {
 249         int ret;
 250
 251         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 252         if (ret)
 253                 return ret;
 254
 255         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 256         if (ret)
 257                 return ret;
 258
 259         return ret;
 260 }
 261
 262 static int __init tc1100_init(void)
 263 {
 264         int result = 0;
 265
 266         if (!wmi_has_guid(GUID))
 267                 return -ENODEV;
 268
 269         result = platform_driver_register(&tc1100_driver);
 270         if (result)
 271                 return result;
 272
 273         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 274         platform_device_add(tc1100_device);
 275
 276         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
 277
 278         return result;
 279 }
 280
 281 static void __exit tc1100_exit(void)
 282 {
 283         platform_device_del(tc1100_device);
 284         platform_driver_unregister(&tc1100_driver);
 285
 286         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
 287 }
 288
 289 module_init(tc1100_init);
 290 module_exit(tc1100_exit);