Merge branch 'sony' into release
[sfrench/cifs-2.6.git] / 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 #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/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
35 #include <linux/platform_device.h>
36
37 #define GUID "C364AC71-36DB-495A-8494-B439D472A505"
38
39 #define TC1100_INSTANCE_WIRELESS                1
40 #define TC1100_INSTANCE_JOGDIAL         2
41
42 #define TC1100_LOGPREFIX "tc1100-wmi: "
43 #define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
44
45 MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
46 MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
47 MODULE_LICENSE("GPL");
48 MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
49
50 static int tc1100_probe(struct platform_device *device);
51 static int tc1100_remove(struct platform_device *device);
52 static int tc1100_suspend(struct platform_device *device, pm_message_t state);
53 static int tc1100_resume(struct platform_device *device);
54
55 static struct platform_driver tc1100_driver = {
56         .driver = {
57                 .name = "tc1100-wmi",
58                 .owner = THIS_MODULE,
59         },
60         .probe = tc1100_probe,
61         .remove = tc1100_remove,
62         .suspend = tc1100_suspend,
63         .resume = tc1100_resume,
64 };
65
66 static struct platform_device *tc1100_device;
67
68 struct tc1100_data {
69         u32 wireless;
70         u32 jogdial;
71 };
72
73 static struct tc1100_data suspend_data;
74
75 /* --------------------------------------------------------------------------
76                                 Device Management
77    -------------------------------------------------------------------------- */
78
79 static int get_state(u32 *out, u8 instance)
80 {
81         u32 tmp;
82         acpi_status status;
83         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
84         union acpi_object *obj;
85
86         if (!out)
87                 return -EINVAL;
88
89         if (instance > 2)
90                 return -ENODEV;
91
92         status = wmi_query_block(GUID, instance, &result);
93         if (ACPI_FAILURE(status))
94                 return -ENODEV;
95
96         obj = (union acpi_object *) result.pointer;
97         if (obj && obj->type == ACPI_TYPE_INTEGER) {
98                 tmp = obj->integer.value;
99         } else {
100                 tmp = 0;
101         }
102
103         if (result.length > 0 && result.pointer)
104                 kfree(result.pointer);
105
106         switch (instance) {
107         case TC1100_INSTANCE_WIRELESS:
108                 *out = (tmp == 3) ? 1 : 0;
109                 return 0;
110         case TC1100_INSTANCE_JOGDIAL:
111                 *out = (tmp == 1) ? 0 : 1;
112                 return 0;
113         default:
114                 return -ENODEV;
115         }
116 }
117
118 static int set_state(u32 *in, u8 instance)
119 {
120         u32 value;
121         acpi_status status;
122         struct acpi_buffer input;
123
124         if (!in)
125                 return -EINVAL;
126
127         if (instance > 2)
128                 return -ENODEV;
129
130         switch (instance) {
131         case TC1100_INSTANCE_WIRELESS:
132                 value = (*in) ? 1 : 2;
133                 break;
134         case TC1100_INSTANCE_JOGDIAL:
135                 value = (*in) ? 0 : 1;
136                 break;
137         default:
138                 return -ENODEV;
139         }
140
141         input.length = sizeof(u32);
142         input.pointer = &value;
143
144         status = wmi_set_block(GUID, instance, &input);
145         if (ACPI_FAILURE(status))
146                 return -ENODEV;
147
148         return 0;
149 }
150
151 /* --------------------------------------------------------------------------
152                                 FS Interface (/sys)
153    -------------------------------------------------------------------------- */
154
155 /*
156  * Read/ write bool sysfs macro
157  */
158 #define show_set_bool(value, instance) \
159 static ssize_t \
160 show_bool_##value(struct device *dev, struct device_attribute *attr, \
161         char *buf) \
162 { \
163         u32 result; \
164         acpi_status status = get_state(&result, instance); \
165         if (ACPI_SUCCESS(status)) \
166                 return sprintf(buf, "%d\n", result); \
167         return sprintf(buf, "Read error\n"); \
168 } \
169 \
170 static ssize_t \
171 set_bool_##value(struct device *dev, struct device_attribute *attr, \
172         const char *buf, size_t count) \
173 { \
174         u32 tmp = simple_strtoul(buf, NULL, 10); \
175         acpi_status status = set_state(&tmp, instance); \
176                 if (ACPI_FAILURE(status)) \
177                         return -EINVAL; \
178         return count; \
179 } \
180 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
181         show_bool_##value, set_bool_##value);
182
183 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
184 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
185
186 static void remove_fs(void)
187 {
188         device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
189         device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
190 }
191
192 static int add_fs(void)
193 {
194         int ret;
195
196         ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
197         if (ret)
198                 goto add_sysfs_error;
199
200         ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
201         if (ret)
202                 goto add_sysfs_error;
203
204         return ret;
205
206 add_sysfs_error:
207         remove_fs();
208         return ret;
209 }
210
211 /* --------------------------------------------------------------------------
212                                 Driver Model
213    -------------------------------------------------------------------------- */
214
215 static int tc1100_probe(struct platform_device *device)
216 {
217         int result = 0;
218
219         result = add_fs();
220         return result;
221 }
222
223
224 static int tc1100_remove(struct platform_device *device)
225 {
226         remove_fs();
227         return 0;
228 }
229
230 static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
231 {
232         int ret;
233
234         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
235         if (ret)
236                 return ret;
237
238         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
239         if (ret)
240                 return ret;
241
242         return ret;
243 }
244
245 static int tc1100_resume(struct platform_device *dev)
246 {
247         int ret;
248
249         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
250         if (ret)
251                 return ret;
252
253         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
254         if (ret)
255                 return ret;
256
257         return ret;
258 }
259
260 static int __init tc1100_init(void)
261 {
262         int result = 0;
263
264         if (!wmi_has_guid(GUID))
265                 return -ENODEV;
266
267         result = platform_driver_register(&tc1100_driver);
268         if (result)
269                 return result;
270
271         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
272         platform_device_add(tc1100_device);
273
274         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
275
276         return result;
277 }
278
279 static void __exit tc1100_exit(void)
280 {
281         platform_device_del(tc1100_device);
282         platform_driver_unregister(&tc1100_driver);
283
284         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
285 }
286
287 module_init(tc1100_init);
288 module_exit(tc1100_exit);