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/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_BUFFER &&
  98                 obj->buffer.length == sizeof(u32)) {
  99                 tmp = *((u32 *) obj->buffer.pointer);
 100         } else {
 101                 tmp = 0;
 102         }
 103
 104         if (result.length > 0 && result.pointer)
 105                 kfree(result.pointer);
 106
 107         switch (instance) {
 108         case TC1100_INSTANCE_WIRELESS:
 109                 *out = (tmp == 3) ? 1 : 0;
 110                 return 0;
 111         case TC1100_INSTANCE_JOGDIAL:
 112                 *out = (tmp == 1) ? 1 : 0;
 113                 return 0;
 114         default:
 115                 return -ENODEV;
 116         }
 117 }
 118
 119 static int set_state(u32 *in, u8 instance)
 120 {
 121         u32 value;
 122         acpi_status status;
 123         struct acpi_buffer input;
 124
 125         if (!in)
 126                 return -EINVAL;
 127
 128         if (instance > 2)
 129                 return -ENODEV;
 130
 131         switch (instance) {
 132         case TC1100_INSTANCE_WIRELESS:
 133                 value = (*in) ? 1 : 2;
 134                 break;
 135         case TC1100_INSTANCE_JOGDIAL:
 136                 value = (*in) ? 0 : 1;
 137                 break;
 138         default:
 139                 return -ENODEV;
 140         }
 141
 142         input.length = sizeof(u32);
 143         input.pointer = &value;
 144
 145         status = wmi_set_block(GUID, instance, &input);
 146         if (ACPI_FAILURE(status))
 147                 return -ENODEV;
 148
 149         return 0;
 150 }
 151
 152 /* --------------------------------------------------------------------------
 153                                 FS Interface (/sys)
 154    -------------------------------------------------------------------------- */
 155
 156 /*
 157  * Read/ write bool sysfs macro
 158  */
 159 #define show_set_bool(value, instance) \
 160 static ssize_t \
 161 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 162         char *buf) \
 163 { \
 164         u32 result; \
 165         acpi_status status = get_state(&result, instance); \
 166         if (ACPI_SUCCESS(status)) \
 167                 return sprintf(buf, "%d\n", result); \
 168         return sprintf(buf, "Read error\n"); \
 169 } \
 170 \
 171 static ssize_t \
 172 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 173         const char *buf, size_t count) \
 174 { \
 175         u32 tmp = simple_strtoul(buf, NULL, 10); \
 176         acpi_status status = set_state(&tmp, instance); \
 177                 if (ACPI_FAILURE(status)) \
 178                         return -EINVAL; \
 179         return count; \
 180 } \
 181 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
 182         show_bool_##value, set_bool_##value);
 183
 184 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 185 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 186
 187 static void remove_fs(void)
 188 {
 189         device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
 190         device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
 191 }
 192
 193 static int add_fs(void)
 194 {
 195         int ret;
 196
 197         ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
 198         if (ret)
 199                 goto add_sysfs_error;
 200
 201         ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
 202         if (ret)
 203                 goto add_sysfs_error;
 204
 205         return ret;
 206
 207 add_sysfs_error:
 208         remove_fs();
 209         return ret;
 210 }
 211
 212 /* --------------------------------------------------------------------------
 213                                 Driver Model
 214    -------------------------------------------------------------------------- */
 215
 216 static int tc1100_probe(struct platform_device *device)
 217 {
 218         int result = 0;
 219
 220         result = add_fs();
 221         return result;
 222 }
 223
 224
 225 static int tc1100_remove(struct platform_device *device)
 226 {
 227         remove_fs();
 228         return 0;
 229 }
 230
 231 static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
 232 {
 233         int ret;
 234
 235         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 236         if (ret)
 237                 return ret;
 238
 239         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 240         if (ret)
 241                 return ret;
 242
 243         return ret;
 244 }
 245
 246 static int tc1100_resume(struct platform_device *dev)
 247 {
 248         int ret;
 249
 250         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 251         if (ret)
 252                 return ret;
 253
 254         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 255         if (ret)
 256                 return ret;
 257
 258         return ret;
 259 }
 260
 261 static int __init tc1100_init(void)
 262 {
 263         int result = 0;
 264
 265         if (!wmi_has_guid(GUID))
 266                 return -ENODEV;
 267
 268         result = platform_driver_register(&tc1100_driver);
 269         if (result)
 270                 return result;
 271
 272         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 273         platform_device_add(tc1100_device);
 274
 275         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
 276
 277         return result;
 278 }
 279
 280 static void __exit tc1100_exit(void)
 281 {
 282         platform_device_del(tc1100_device);
 283         platform_driver_unregister(&tc1100_driver);
 284
 285         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
 286 }
 287
 288 module_init(tc1100_init);
 289 module_exit(tc1100_exit);