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