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Linux/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 #ifdef CONFIG_PM
 56 static struct tc1100_data suspend_data;
 57 #endif
 58 
 59 /* --------------------------------------------------------------------------
 60                                 Device Management
 61    -------------------------------------------------------------------------- */
 62 
 63 static 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 
102 static 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) \
143 static ssize_t \
144 show_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 \
154 static ssize_t \
155 set_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 } \
164 static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
165         show_bool_##value, set_bool_##value);
166 
167 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
168 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
169 
170 static struct attribute *tc1100_attributes[] = {
171         &dev_attr_wireless.attr,
172         &dev_attr_jogdial.attr,
173         NULL
174 };
175 
176 static struct attribute_group tc1100_attribute_group = {
177         .attrs  = tc1100_attributes,
178 };
179 
180 /* --------------------------------------------------------------------------
181                                 Driver Model
182    -------------------------------------------------------------------------- */
183 
184 static int __init tc1100_probe(struct platform_device *device)
185 {
186         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
187 }
188 
189 
190 static 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
198 static 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 
213 static 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 
228 static 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 
236 static 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 
246 static 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 
275 static void __exit tc1100_exit(void)
276 {
277         platform_device_unregister(tc1100_device);
278         platform_driver_unregister(&tc1100_driver);
279 }
280 
281 module_init(tc1100_init);
282 module_exit(tc1100_exit);
283 

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