drivers/platform/x86/tc1100-wmi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HP Compaq TC1100 Tablet WMI Extras Driver
   4  *
   5  *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
   6  *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
   7  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   8  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/init.h>
  17 #include <linux/types.h>
  18 #include <linux/acpi.h>
  19 #include <linux/platform_device.h>
  20
  21 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
  22
  23 #define TC1100_INSTANCE_WIRELESS                1
  24 #define TC1100_INSTANCE_JOGDIAL         2
  25
  26 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
  27 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
  28 MODULE_LICENSE("GPL");
  29 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
  30
  31 static struct platform_device *tc1100_device;
  32
  33 struct tc1100_data {
  34         u32 wireless;
  35         u32 jogdial;
  36 };
  37
  38 #ifdef CONFIG_PM
  39 static struct tc1100_data suspend_data;
  40 #endif
  41
  42 /* --------------------------------------------------------------------------
  43                                 Device Management
  44    -------------------------------------------------------------------------- */
  45
  46 static int get_state(u32 *out, u8 instance)
  47 {
  48         u32 tmp;
  49         acpi_status status;
  50         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
  51         union acpi_object *obj;
  52
  53         if (!out)
  54                 return -EINVAL;
  55
  56         if (instance > 2)
  57                 return -ENODEV;
  58
  59         status = wmi_query_block(GUID, instance, &result);
  60         if (ACPI_FAILURE(status))
  61                 return -ENODEV;
  62
  63         obj = (union acpi_object *) result.pointer;
  64         if (obj && obj->type == ACPI_TYPE_INTEGER) {
  65                 tmp = obj->integer.value;
  66         } else {
  67                 tmp = 0;
  68         }
  69
  70         if (result.length > 0)
  71                 kfree(result.pointer);
  72
  73         switch (instance) {
  74         case TC1100_INSTANCE_WIRELESS:
  75                 *out = (tmp == 3) ? 1 : 0;
  76                 return 0;
  77         case TC1100_INSTANCE_JOGDIAL:
  78                 *out = (tmp == 1) ? 0 : 1;
  79                 return 0;
  80         default:
  81                 return -ENODEV;
  82         }
  83 }
  84
  85 static int set_state(u32 *in, u8 instance)
  86 {
  87         u32 value;
  88         acpi_status status;
  89         struct acpi_buffer input;
  90
  91         if (!in)
  92                 return -EINVAL;
  93
  94         if (instance > 2)
  95                 return -ENODEV;
  96
  97         switch (instance) {
  98         case TC1100_INSTANCE_WIRELESS:
  99                 value = (*in) ? 1 : 2;
 100                 break;
 101         case TC1100_INSTANCE_JOGDIAL:
 102                 value = (*in) ? 0 : 1;
 103                 break;
 104         default:
 105                 return -ENODEV;
 106         }
 107
 108         input.length = sizeof(u32);
 109         input.pointer = &value;
 110
 111         status = wmi_set_block(GUID, instance, &input);
 112         if (ACPI_FAILURE(status))
 113                 return -ENODEV;
 114
 115         return 0;
 116 }
 117
 118 /* --------------------------------------------------------------------------
 119                                 FS Interface (/sys)
 120    -------------------------------------------------------------------------- */
 121
 122 /*
 123  * Read/ write bool sysfs macro
 124  */
 125 #define show_set_bool(value, instance) \
 126 static ssize_t \
 127 show_bool_##value(struct device *dev, struct device_attribute *attr, \
 128         char *buf) \
 129 { \
 130         u32 result; \
 131         acpi_status status = get_state(&result, instance); \
 132         if (ACPI_SUCCESS(status)) \
 133                 return sprintf(buf, "%d\n", result); \
 134         return sprintf(buf, "Read error\n"); \
 135 } \
 136 \
 137 static ssize_t \
 138 set_bool_##value(struct device *dev, struct device_attribute *attr, \
 139         const char *buf, size_t count) \
 140 { \
 141         u32 tmp = simple_strtoul(buf, NULL, 10); \
 142         acpi_status status = set_state(&tmp, instance); \
 143                 if (ACPI_FAILURE(status)) \
 144                         return -EINVAL; \
 145         return count; \
 146 } \
 147 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
 148         show_bool_##value, set_bool_##value);
 149
 150 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
 151 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
 152
 153 static struct attribute *tc1100_attributes[] = {
 154         &dev_attr_wireless.attr,
 155         &dev_attr_jogdial.attr,
 156         NULL
 157 };
 158
 159 static struct attribute_group tc1100_attribute_group = {
 160         .attrs  = tc1100_attributes,
 161 };
 162
 163 /* --------------------------------------------------------------------------
 164                                 Driver Model
 165    -------------------------------------------------------------------------- */
 166
 167 static int __init tc1100_probe(struct platform_device *device)
 168 {
 169         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
 170 }
 171
 172
 173 static int tc1100_remove(struct platform_device *device)
 174 {
 175         sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
 176
 177         return 0;
 178 }
 179
 180 #ifdef CONFIG_PM
 181 static int tc1100_suspend(struct device *dev)
 182 {
 183         int ret;
 184
 185         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 186         if (ret)
 187                 return ret;
 188
 189         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 190         if (ret)
 191                 return ret;
 192
 193         return 0;
 194 }
 195
 196 static int tc1100_resume(struct device *dev)
 197 {
 198         int ret;
 199
 200         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
 201         if (ret)
 202                 return ret;
 203
 204         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
 205         if (ret)
 206                 return ret;
 207
 208         return 0;
 209 }
 210
 211 static const struct dev_pm_ops tc1100_pm_ops = {
 212         .suspend        = tc1100_suspend,
 213         .resume         = tc1100_resume,
 214         .freeze         = tc1100_suspend,
 215         .restore        = tc1100_resume,
 216 };
 217 #endif
 218
 219 static struct platform_driver tc1100_driver = {
 220         .driver = {
 221                 .name = "tc1100-wmi",
 222 #ifdef CONFIG_PM
 223                 .pm = &tc1100_pm_ops,
 224 #endif
 225         },
 226         .remove = tc1100_remove,
 227 };
 228
 229 static int __init tc1100_init(void)
 230 {
 231         int error;
 232
 233         if (!wmi_has_guid(GUID))
 234                 return -ENODEV;
 235
 236         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
 237         if (!tc1100_device)
 238                 return -ENOMEM;
 239
 240         error = platform_device_add(tc1100_device);
 241         if (error)
 242                 goto err_device_put;
 243
 244         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
 245         if (error)
 246                 goto err_device_del;
 247
 248         pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
 249         return 0;
 250
 251  err_device_del:
 252         platform_device_del(tc1100_device);
 253  err_device_put:
 254         platform_device_put(tc1100_device);
 255         return error;
 256 }
 257
 258 static void __exit tc1100_exit(void)
 259 {
 260         platform_device_unregister(tc1100_device);
 261         platform_driver_unregister(&tc1100_driver);
 262 }
 263
 264 module_init(tc1100_init);
 265 module_exit(tc1100_exit);