Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6] / drivers / misc / 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/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
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 int tc1100_probe(struct platform_device *device);
52 static int tc1100_remove(struct platform_device *device);
53 static int tc1100_suspend(struct platform_device *device, pm_message_t state);
54 static int tc1100_resume(struct platform_device *device);
55
56 static 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
67 static struct platform_device *tc1100_device;
68
69 struct tc1100_data {
70         u32 wireless;
71         u32 jogdial;
72 };
73
74 static struct tc1100_data suspend_data;
75
76 /* --------------------------------------------------------------------------
77                                 Device Management
78    -------------------------------------------------------------------------- */
79
80 static 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
120 static 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) \
161 static ssize_t \
162 show_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 \
172 static ssize_t \
173 set_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 } \
182 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
183         show_bool_##value, set_bool_##value);
184
185 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
186 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
187
188 static 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
194 static 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
208 add_sysfs_error:
209         remove_fs();
210         return ret;
211 }
212
213 /* --------------------------------------------------------------------------
214                                 Driver Model
215    -------------------------------------------------------------------------- */
216
217 static int tc1100_probe(struct platform_device *device)
218 {
219         int result = 0;
220
221         result = add_fs();
222         return result;
223 }
224
225
226 static int tc1100_remove(struct platform_device *device)
227 {
228         remove_fs();
229         return 0;
230 }
231
232 static 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
247 static 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
262 static 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
281 static 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
289 module_init(tc1100_init);
290 module_exit(tc1100_exit);