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/slab.h>
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <acpi/acpi.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 struct platform_device *tc1100_device;
  52
  53 struct tc1100_data {
  54         u32 wireless;
  55         u32 jogdial;
  56 };
  57
  58 static struct tc1100_data suspend_data;
  59
  60 /* --------------------------------------------------------------------------
  61                                 Device Management
  62    -------------------------------------------------------------------------- */
  63
  64 static int get_state(u32 *out, u8 instance)
  65 {
  66         u32 tmp;
  67         acpi_status status;
  68         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  69         union acpi_object *obj;
  70
  71         if (!out)
  72                 return -EINVAL;
  73
  74         if (instance > 2)
  75                 return -ENODEV;
  76
  77         status = wmi_query_block(GUID, instance, &result);
  78         if (ACPI_FAILURE(status))
  79                 return -ENODEV;
  80
  81         obj = (union acpi_object *) result.pointer;
  82         if (obj && obj->type == ACPI_TYPE_INTEGER) {
  83                 tmp = obj->integer.value;
  84         } else {
  85                 tmp = 0;
  86         }
  87
  88         if (result.length > 0 && result.pointer)
  89                 kfree(result.pointer);
  90
  91         switch (instance) {
  92         case TC1100_INSTANCE_WIRELESS:
  93                 *out = (tmp == 3) ? 1 : 0;
  94                 return 0;
  95         case TC1100_INSTANCE_JOGDIAL:
  96                 *out = (tmp == 1) ? 0 : 1;
  97                 return 0;
  98         default:
  99                 return -ENODEV;
 100         }
 101 }
 102
 103 static int set_state(u32 *in, u8 instance)
 104 {
 105         u32 value;
 106         acpi_status status;
 107         struct acpi_buffer input;
 108
 109         if (!in)
 110                 return -EINVAL;
 111
 112         if (instance > 2)
 113                 return -ENODEV;
 114
 115         switch (instance) {
 116         case TC1100_INSTANCE_WIRELESS:
 117                 value = (*in) ? 1 : 2;
 118                 break;
 119         case TC1100_INSTANCE_JOGDIAL:
 120                 value = (*in) ? 0 : 1;
 121                 break;
 122         default:
 123                 return -ENODEV;
 124         }
 125
 126         input.length = sizeof(u32);
 127         input.pointer = &value;
 128
 129         status = wmi_set_block(GUID, instance, &input);
 130         if (ACPI_FAILURE(status))
 131                 return -ENODEV;
 132
 133         return 0;
 134 }
 135
 136 /* --------------------------------------------------------------------------
 137                                 FS Interface (/sys)
 138    -------------------------------------------------------------------------- */
 139
 140 /*
 141  * Read/ write bool sysfs macro
 142  */
 143 #define show_set_bool(value, instance) \
 144 static ssize_t \
 145 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 146         char *buf) \
 147 { \
 148         u32 result; \
 149         acpi_status status = get_state(&result, instance); \
 150         if (ACPI_SUCCESS(status)) \
 151                 return sprintf(buf, "%d\n", result); \
 152         return sprintf(buf, "Read error\n"); \
 153 } \
 154 \
 155 static ssize_t \
 156 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 157         const char *buf, size_t count) \
 158 { \
 159         u32 tmp = simple_strtoul(buf, NULL, 10); \
 160         acpi_status status = set_state(&tmp, instance); \
 161                 if (ACPI_FAILURE(status)) \
 162                         return -EINVAL; \
 163         return count; \
 164 } \
 165 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
 166         show_bool_##value, set_bool_##value);
 167
 168 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 169 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 170
 171 static struct attribute *tc1100_attributes[] = {
 172         &dev_attr_wireless.attr,
 173         &dev_attr_jogdial.attr,
 174         NULL
 175 };
 176
 177 static struct attribute_group tc1100_attribute_group = {
 178         .attrs  = tc1100_attributes,
 179 };
 180
 181 /* --------------------------------------------------------------------------
 182                                 Driver Model
 183    -------------------------------------------------------------------------- */
 184
 185 static int __init tc1100_probe(struct platform_device *device)
 186 {
 187         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
 188 }
 189
 190
 191 static int __devexit tc1100_remove(struct platform_device *device)
 192 {
 193         sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
 194
 195         return 0;
 196 }
 197
 198 #ifdef CONFIG_PM
 199 static int tc1100_suspend(struct device *dev)
 200 {
 201         int ret;
 202
 203         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 204         if (ret)
 205                 return ret;
 206
 207         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 208         if (ret)
 209                 return ret;
 210
 211         return 0;
 212 }
 213
 214 static int tc1100_resume(struct device *dev)
 215 {
 216         int ret;
 217
 218         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 219         if (ret)
 220                 return ret;
 221
 222         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 223         if (ret)
 224                 return ret;
 225
 226         return 0;
 227 }
 228
 229 static const struct dev_pm_ops tc1100_pm_ops = {
 230         .suspend        = tc1100_suspend,
 231         .resume         = tc1100_resume,
 232         .freeze         = tc1100_suspend,
 233         .restore        = tc1100_resume,
 234 };
 235 #endif
 236
 237 static struct platform_driver tc1100_driver = {
 238         .driver = {
 239                 .name = "tc1100-wmi",
 240                 .owner = THIS_MODULE,
 241 #ifdef CONFIG_PM
 242                 .pm = &tc1100_pm_ops,
 243 #endif
 244         },
 245         .remove = __devexit_p(tc1100_remove),
 246 };
 247
 248 static int __init tc1100_init(void)
 249 {
 250         int error;
 251
 252         if (!wmi_has_guid(GUID))
 253                 return -ENODEV;
 254
 255         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 256         if (!tc1100_device)
 257                 return -ENOMEM;
 258
 259         error = platform_device_add(tc1100_device);
 260         if (error)
 261                 goto err_device_put;
 262
 263         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
 264         if (error)
 265                 goto err_device_del;
 266
 267         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
 268         return 0;
 269
 270  err_device_del:
 271         platform_device_del(tc1100_device);
 272  err_device_put:
 273         platform_device_put(tc1100_device);
 274         return error;
 275 }
 276
 277 static void __exit tc1100_exit(void)
 278 {
 279         platform_device_unregister(tc1100_device);
 280         platform_driver_unregister(&tc1100_driver);
 281 }
 282
 283 module_init(tc1100_init);
 284 module_exit(tc1100_exit);