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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/slab.h>
  33 #include <linux/init.h>
  34 #include <linux/types.h>
  35 #include <linux/acpi.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 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  44 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  45 MODULE_LICENSE("GPL");
  46 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  47
  48 static struct platform_device *tc1100_device;
  49
  50 struct tc1100_data {
  51         u32 wireless;
  52         u32 jogdial;
  53 };
  54
  55 #ifdef CONFIG_PM
  56 static struct tc1100_data suspend_data;
  57 #endif
  58
  59 /* --------------------------------------------------------------------------
  60                                 Device Management
  61    -------------------------------------------------------------------------- */
  62
  63 static int get_state(u32 *out, u8 instance)
  64 {
  65         u32 tmp;
  66         acpi_status status;
  67         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  68         union acpi_object *obj;
  69
  70         if (!out)
  71                 return -EINVAL;
  72
  73         if (instance > 2)
  74                 return -ENODEV;
  75
  76         status = wmi_query_block(GUID, instance, &result);
  77         if (ACPI_FAILURE(status))
  78                 return -ENODEV;
  79
  80         obj = (union acpi_object *) result.pointer;
  81         if (obj && obj->type == ACPI_TYPE_INTEGER) {
  82                 tmp = obj->integer.value;
  83         } else {
  84                 tmp = 0;
  85         }
  86
  87         if (result.length > 0)
  88                 kfree(result.pointer);
  89
  90         switch (instance) {
  91         case TC1100_INSTANCE_WIRELESS:
  92                 *out = (tmp == 3) ? 1 : 0;
  93                 return 0;
  94         case TC1100_INSTANCE_JOGDIAL:
  95                 *out = (tmp == 1) ? 0 : 1;
  96                 return 0;
  97         default:
  98                 return -ENODEV;
  99         }
 100 }
 101
 102 static int set_state(u32 *in, u8 instance)
 103 {
 104         u32 value;
 105         acpi_status status;
 106         struct acpi_buffer input;
 107
 108         if (!in)
 109                 return -EINVAL;
 110
 111         if (instance > 2)
 112                 return -ENODEV;
 113
 114         switch (instance) {
 115         case TC1100_INSTANCE_WIRELESS:
 116                 value = (*in) ? 1 : 2;
 117                 break;
 118         case TC1100_INSTANCE_JOGDIAL:
 119                 value = (*in) ? 0 : 1;
 120                 break;
 121         default:
 122                 return -ENODEV;
 123         }
 124
 125         input.length = sizeof(u32);
 126         input.pointer = &value;
 127
 128         status = wmi_set_block(GUID, instance, &input);
 129         if (ACPI_FAILURE(status))
 130                 return -ENODEV;
 131
 132         return 0;
 133 }
 134
 135 /* --------------------------------------------------------------------------
 136                                 FS Interface (/sys)
 137    -------------------------------------------------------------------------- */
 138
 139 /*
 140  * Read/ write bool sysfs macro
 141  */
 142 #define show_set_bool(value, instance) \
 143 static ssize_t \
 144 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 145         char *buf) \
 146 { \
 147         u32 result; \
 148         acpi_status status = get_state(&result, instance); \
 149         if (ACPI_SUCCESS(status)) \
 150                 return sprintf(buf, "%d\n", result); \
 151         return sprintf(buf, "Read error\n"); \
 152 } \
 153 \
 154 static ssize_t \
 155 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 156         const char *buf, size_t count) \
 157 { \
 158         u32 tmp = simple_strtoul(buf, NULL, 10); \
 159         acpi_status status = set_state(&tmp, instance); \
 160                 if (ACPI_FAILURE(status)) \
 161                         return -EINVAL; \
 162         return count; \
 163 } \
 164 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
 165         show_bool_##value, set_bool_##value);
 166
 167 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 168 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 169
 170 static struct attribute *tc1100_attributes[] = {
 171         &dev_attr_wireless.attr,
 172         &dev_attr_jogdial.attr,
 173         NULL
 174 };
 175
 176 static struct attribute_group tc1100_attribute_group = {
 177         .attrs  = tc1100_attributes,
 178 };
 179
 180 /* --------------------------------------------------------------------------
 181                                 Driver Model
 182    -------------------------------------------------------------------------- */
 183
 184 static int __init tc1100_probe(struct platform_device *device)
 185 {
 186         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
 187 }
 188
 189
 190 static int tc1100_remove(struct platform_device *device)
 191 {
 192         sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
 193
 194         return 0;
 195 }
 196
 197 #ifdef CONFIG_PM
 198 static int tc1100_suspend(struct device *dev)
 199 {
 200         int ret;
 201
 202         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 203         if (ret)
 204                 return ret;
 205
 206         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 207         if (ret)
 208                 return ret;
 209
 210         return 0;
 211 }
 212
 213 static int tc1100_resume(struct device *dev)
 214 {
 215         int ret;
 216
 217         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 218         if (ret)
 219                 return ret;
 220
 221         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 222         if (ret)
 223                 return ret;
 224
 225         return 0;
 226 }
 227
 228 static const struct dev_pm_ops tc1100_pm_ops = {
 229         .suspend        = tc1100_suspend,
 230         .resume         = tc1100_resume,
 231         .freeze         = tc1100_suspend,
 232         .restore        = tc1100_resume,
 233 };
 234 #endif
 235
 236 static struct platform_driver tc1100_driver = {
 237         .driver = {
 238                 .name = "tc1100-wmi",
 239 #ifdef CONFIG_PM
 240                 .pm = &tc1100_pm_ops,
 241 #endif
 242         },
 243         .remove = tc1100_remove,
 244 };
 245
 246 static int __init tc1100_init(void)
 247 {
 248         int error;
 249
 250         if (!wmi_has_guid(GUID))
 251                 return -ENODEV;
 252
 253         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 254         if (!tc1100_device)
 255                 return -ENOMEM;
 256
 257         error = platform_device_add(tc1100_device);
 258         if (error)
 259                 goto err_device_put;
 260
 261         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
 262         if (error)
 263                 goto err_device_del;
 264
 265         pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
 266         return 0;
 267
 268  err_device_del:
 269         platform_device_del(tc1100_device);
 270  err_device_put:
 271         platform_device_put(tc1100_device);
 272         return error;
 273 }
 274
 275 static void __exit tc1100_exit(void)
 276 {
 277         platform_device_unregister(tc1100_device);
 278         platform_driver_unregister(&tc1100_driver);
 279 }
 280
 281 module_init(tc1100_init);
 282 module_exit(tc1100_exit);