drivers/platform/x86/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/acpi_bus.h>
  34 #include <acpi/acpi_drivers.h>
  35 #include <linux/platform_device.h>
  36
  37 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
  38
  39 #define TC1100_INSTANCE_WIRELESS                1
  40 #define TC1100_INSTANCE_JOGDIAL         2
  41
  42 #define TC1100_LOGPREFIX "tc1100-wmi: "
  43 #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
  44
  45 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  46 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  47 MODULE_LICENSE("GPL");
  48 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  49
  50 static int tc1100_probe(struct platform_device *device);
  51 static int tc1100_remove(struct platform_device *device);
  52 static int tc1100_suspend(struct platform_device *device, pm_message_t state);
  53 static int tc1100_resume(struct platform_device *device);
  54
  55 static struct platform_driver tc1100_driver = {
  56         .driver = {
  57                 .name = "tc1100-wmi",
  58                 .owner = THIS_MODULE,
  59         },
  60         .probe = tc1100_probe,
  61         .remove = tc1100_remove,
  62         .suspend = tc1100_suspend,
  63         .resume = tc1100_resume,
  64 };
  65
  66 static struct platform_device *tc1100_device;
  67
  68 struct tc1100_data {
  69         u32 wireless;
  70         u32 jogdial;
  71 };
  72
  73 static struct tc1100_data suspend_data;
  74
  75 /* --------------------------------------------------------------------------
  76                                 Device Management
  77    -------------------------------------------------------------------------- */
  78
  79 static int get_state(u32 *out, u8 instance)
  80 {
  81         u32 tmp;
  82         acpi_status status;
  83         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  84         union acpi_object *obj;
  85
  86         if (!out)
  87                 return -EINVAL;
  88
  89         if (instance > 2)
  90                 return -ENODEV;
  91
  92         status = wmi_query_block(GUID, instance, &result);
  93         if (ACPI_FAILURE(status))
  94                 return -ENODEV;
  95
  96         obj = (union acpi_object *) result.pointer;
  97         if (obj && obj->type == ACPI_TYPE_INTEGER) {
  98                 tmp = obj->integer.value;
  99         } else {
 100                 tmp = 0;
 101         }
 102
 103         if (result.length > 0 && result.pointer)
 104                 kfree(result.pointer);
 105
 106         switch (instance) {
 107         case TC1100_INSTANCE_WIRELESS:
 108                 *out = (tmp == 3) ? 1 : 0;
 109                 return 0;
 110         case TC1100_INSTANCE_JOGDIAL:
 111                 *out = (tmp == 1) ? 0 : 1;
 112                 return 0;
 113         default:
 114                 return -ENODEV;
 115         }
 116 }
 117
 118 static int set_state(u32 *in, u8 instance)
 119 {
 120         u32 value;
 121         acpi_status status;
 122         struct acpi_buffer input;
 123
 124         if (!in)
 125                 return -EINVAL;
 126
 127         if (instance > 2)
 128                 return -ENODEV;
 129
 130         switch (instance) {
 131         case TC1100_INSTANCE_WIRELESS:
 132                 value = (*in) ? 1 : 2;
 133                 break;
 134         case TC1100_INSTANCE_JOGDIAL:
 135                 value = (*in) ? 0 : 1;
 136                 break;
 137         default:
 138                 return -ENODEV;
 139         }
 140
 141         input.length = sizeof(u32);
 142         input.pointer = &value;
 143
 144         status = wmi_set_block(GUID, instance, &input);
 145         if (ACPI_FAILURE(status))
 146                 return -ENODEV;
 147
 148         return 0;
 149 }
 150
 151 /* --------------------------------------------------------------------------
 152                                 FS Interface (/sys)
 153    -------------------------------------------------------------------------- */
 154
 155 /*
 156  * Read/ write bool sysfs macro
 157  */
 158 #define show_set_bool(value, instance) \
 159 static ssize_t \
 160 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 161         char *buf) \
 162 { \
 163         u32 result; \
 164         acpi_status status = get_state(&result, instance); \
 165         if (ACPI_SUCCESS(status)) \
 166                 return sprintf(buf, "%d\n", result); \
 167         return sprintf(buf, "Read error\n"); \
 168 } \
 169 \
 170 static ssize_t \
 171 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 172         const char *buf, size_t count) \
 173 { \
 174         u32 tmp = simple_strtoul(buf, NULL, 10); \
 175         acpi_status status = set_state(&tmp, instance); \
 176                 if (ACPI_FAILURE(status)) \
 177                         return -EINVAL; \
 178         return count; \
 179 } \
 180 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
 181         show_bool_##value, set_bool_##value);
 182
 183 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 184 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 185
 186 static void remove_fs(void)
 187 {
 188         device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
 189         device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
 190 }
 191
 192 static int add_fs(void)
 193 {
 194         int ret;
 195
 196         ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
 197         if (ret)
 198                 goto add_sysfs_error;
 199
 200         ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
 201         if (ret)
 202                 goto add_sysfs_error;
 203
 204         return ret;
 205
 206 add_sysfs_error:
 207         remove_fs();
 208         return ret;
 209 }
 210
 211 /* --------------------------------------------------------------------------
 212                                 Driver Model
 213    -------------------------------------------------------------------------- */
 214
 215 static int tc1100_probe(struct platform_device *device)
 216 {
 217         int result = 0;
 218
 219         result = add_fs();
 220         return result;
 221 }
 222
 223
 224 static int tc1100_remove(struct platform_device *device)
 225 {
 226         remove_fs();
 227         return 0;
 228 }
 229
 230 static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
 231 {
 232         int ret;
 233
 234         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 235         if (ret)
 236                 return ret;
 237
 238         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 239         if (ret)
 240                 return ret;
 241
 242         return ret;
 243 }
 244
 245 static int tc1100_resume(struct platform_device *dev)
 246 {
 247         int ret;
 248
 249         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 250         if (ret)
 251                 return ret;
 252
 253         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 254         if (ret)
 255                 return ret;
 256
 257         return ret;
 258 }
 259
 260 static int __init tc1100_init(void)
 261 {
 262         int result = 0;
 263
 264         if (!wmi_has_guid(GUID))
 265                 return -ENODEV;
 266
 267         result = platform_driver_register(&tc1100_driver);
 268         if (result)
 269                 return result;
 270
 271         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 272         platform_device_add(tc1100_device);
 273
 274         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
 275
 276         return result;
 277 }
 278
 279 static void __exit tc1100_exit(void)
 280 {
 281         platform_device_del(tc1100_device);
 282         platform_driver_unregister(&tc1100_driver);
 283
 284         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
 285 }
 286
 287 module_init(tc1100_init);
 288 module_exit(tc1100_exit);