linux/drivers/misc/tc1100-wmi.c
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   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/actypes.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
  46MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  47MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  48MODULE_LICENSE("GPL");
  49MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  50
  51static int tc1100_probe(struct platform_device *device);
  52static int tc1100_remove(struct platform_device *device);
  53static int tc1100_suspend(struct platform_device *device, pm_message_t state);
  54static int tc1100_resume(struct platform_device *device);
  55
  56static struct platform_driver tc1100_driver = {
  57        .driver = {
  58                .name = "tc1100-wmi",
  59                .owner = THIS_MODULE,
  60        },
  61        .probe = tc1100_probe,
  62        .remove = tc1100_remove,
  63        .suspend = tc1100_suspend,
  64        .resume = tc1100_resume,
  65};
  66
  67static struct platform_device *tc1100_device;
  68
  69struct tc1100_data {
  70        u32 wireless;
  71        u32 jogdial;
  72};
  73
  74static struct tc1100_data suspend_data;
  75
  76/* --------------------------------------------------------------------------
  77                                Device Management
  78   -------------------------------------------------------------------------- */
  79
  80static int get_state(u32 *out, u8 instance)
  81{
  82        u32 tmp;
  83        acpi_status status;
  84        struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  85        union acpi_object *obj;
  86
  87        if (!out)
  88                return -EINVAL;
  89
  90        if (instance > 2)
  91                return -ENODEV;
  92
  93        status = wmi_query_block(GUID, instance, &result);
  94        if (ACPI_FAILURE(status))
  95                return -ENODEV;
  96
  97        obj = (union acpi_object *) result.pointer;
  98        if (obj && obj->type == ACPI_TYPE_BUFFER &&
  99                obj->buffer.length == sizeof(u32)) {
 100                tmp = *((u32 *) obj->buffer.pointer);
 101        } else {
 102                tmp = 0;
 103        }
 104
 105        if (result.length > 0 && result.pointer)
 106                kfree(result.pointer);
 107
 108        switch (instance) {
 109        case TC1100_INSTANCE_WIRELESS:
 110                *out = (tmp == 3) ? 1 : 0;
 111                return 0;
 112        case TC1100_INSTANCE_JOGDIAL:
 113                *out = (tmp == 1) ? 1 : 0;
 114                return 0;
 115        default:
 116                return -ENODEV;
 117        }
 118}
 119
 120static int set_state(u32 *in, u8 instance)
 121{
 122        u32 value;
 123        acpi_status status;
 124        struct acpi_buffer input;
 125
 126        if (!in)
 127                return -EINVAL;
 128
 129        if (instance > 2)
 130                return -ENODEV;
 131
 132        switch (instance) {
 133        case TC1100_INSTANCE_WIRELESS:
 134                value = (*in) ? 1 : 2;
 135                break;
 136        case TC1100_INSTANCE_JOGDIAL:
 137                value = (*in) ? 0 : 1;
 138                break;
 139        default:
 140                return -ENODEV;
 141        }
 142
 143        input.length = sizeof(u32);
 144        input.pointer = &value;
 145
 146        status = wmi_set_block(GUID, instance, &input);
 147        if (ACPI_FAILURE(status))
 148                return -ENODEV;
 149
 150        return 0;
 151}
 152
 153/* --------------------------------------------------------------------------
 154                                FS Interface (/sys)
 155   -------------------------------------------------------------------------- */
 156
 157/*
 158 * Read/ write bool sysfs macro
 159 */
 160#define show_set_bool(value, instance) \
 161static ssize_t \
 162show_bool_##value(struct device *dev, struct device_attribute *attr, \
 163        char *buf) \
 164{ \
 165        u32 result; \
 166        acpi_status status = get_state(&result, instance); \
 167        if (ACPI_SUCCESS(status)) \
 168                return sprintf(buf, "%d\n", result); \
 169        return sprintf(buf, "Read error\n"); \
 170} \
 171\
 172static ssize_t \
 173set_bool_##value(struct device *dev, struct device_attribute *attr, \
 174        const char *buf, size_t count) \
 175{ \
 176        u32 tmp = simple_strtoul(buf, NULL, 10); \
 177        acpi_status status = set_state(&tmp, instance); \
 178                if (ACPI_FAILURE(status)) \
 179                        return -EINVAL; \
 180        return count; \
 181} \
 182static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
 183        show_bool_##value, set_bool_##value);
 184
 185show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 186show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 187
 188static void remove_fs(void)
 189{
 190        device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
 191        device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
 192}
 193
 194static int add_fs(void)
 195{
 196        int ret;
 197
 198        ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
 199        if (ret)
 200                goto add_sysfs_error;
 201
 202        ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
 203        if (ret)
 204                goto add_sysfs_error;
 205
 206        return ret;
 207
 208add_sysfs_error:
 209        remove_fs();
 210        return ret;
 211}
 212
 213/* --------------------------------------------------------------------------
 214                                Driver Model
 215   -------------------------------------------------------------------------- */
 216
 217static int tc1100_probe(struct platform_device *device)
 218{
 219        int result = 0;
 220
 221        result = add_fs();
 222        return result;
 223}
 224
 225
 226static int tc1100_remove(struct platform_device *device)
 227{
 228        remove_fs();
 229        return 0;
 230}
 231
 232static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
 233{
 234        int ret;
 235
 236        ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 237        if (ret)
 238                return ret;
 239
 240        ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 241        if (ret)
 242                return ret;
 243
 244        return ret;
 245}
 246
 247static int tc1100_resume(struct platform_device *dev)
 248{
 249        int ret;
 250
 251        ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 252        if (ret)
 253                return ret;
 254
 255        ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 256        if (ret)
 257                return ret;
 258
 259        return ret;
 260}
 261
 262static int __init tc1100_init(void)
 263{
 264        int result = 0;
 265
 266        if (!wmi_has_guid(GUID))
 267                return -ENODEV;
 268
 269        result = platform_driver_register(&tc1100_driver);
 270        if (result)
 271                return result;
 272
 273        tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 274        platform_device_add(tc1100_device);
 275
 276        printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
 277
 278        return result;
 279}
 280
 281static void __exit tc1100_exit(void)
 282{
 283        platform_device_del(tc1100_device);
 284        platform_driver_unregister(&tc1100_driver);
 285
 286        printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
 287}
 288
 289module_init(tc1100_init);
 290module_exit(tc1100_exit);
 291