linux/drivers/platform/x86/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#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
  43MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  44MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  45MODULE_LICENSE("GPL");
  46MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  47
  48static struct platform_device *tc1100_device;
  49
  50struct tc1100_data {
  51        u32 wireless;
  52        u32 jogdial;
  53};
  54
  55#ifdef CONFIG_PM
  56static struct tc1100_data suspend_data;
  57#endif
  58
  59/* --------------------------------------------------------------------------
  60                                Device Management
  61   -------------------------------------------------------------------------- */
  62
  63static 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
 102static 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) \
 143static ssize_t \
 144show_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\
 154static ssize_t \
 155set_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} \
 164static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
 165        show_bool_##value, set_bool_##value);
 166
 167show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 168show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 169
 170static struct attribute *tc1100_attributes[] = {
 171        &dev_attr_wireless.attr,
 172        &dev_attr_jogdial.attr,
 173        NULL
 174};
 175
 176static struct attribute_group tc1100_attribute_group = {
 177        .attrs  = tc1100_attributes,
 178};
 179
 180/* --------------------------------------------------------------------------
 181                                Driver Model
 182   -------------------------------------------------------------------------- */
 183
 184static int __init tc1100_probe(struct platform_device *device)
 185{
 186        return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
 187}
 188
 189
 190static 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
 198static 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
 213static 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
 228static 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
 236static 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
 246static 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
 275static void __exit tc1100_exit(void)
 276{
 277        platform_device_unregister(tc1100_device);
 278        platform_driver_unregister(&tc1100_driver);
 279}
 280
 281module_init(tc1100_init);
 282module_exit(tc1100_exit);
 283