Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-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/slab.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <acpi/acpi.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 struct platform_device *tc1100_device;
52
53 struct tc1100_data {
54         u32 wireless;
55         u32 jogdial;
56 };
57
58 static struct tc1100_data suspend_data;
59
60 /* --------------------------------------------------------------------------
61                                 Device Management
62    -------------------------------------------------------------------------- */
63
64 static int get_state(u32 *out, u8 instance)
65 {
66         u32 tmp;
67         acpi_status status;
68         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
69         union acpi_object *obj;
70
71         if (!out)
72                 return -EINVAL;
73
74         if (instance > 2)
75                 return -ENODEV;
76
77         status = wmi_query_block(GUID, instance, &result);
78         if (ACPI_FAILURE(status))
79                 return -ENODEV;
80
81         obj = (union acpi_object *) result.pointer;
82         if (obj && obj->type == ACPI_TYPE_INTEGER) {
83                 tmp = obj->integer.value;
84         } else {
85                 tmp = 0;
86         }
87
88         if (result.length > 0 && result.pointer)
89                 kfree(result.pointer);
90
91         switch (instance) {
92         case TC1100_INSTANCE_WIRELESS:
93                 *out = (tmp == 3) ? 1 : 0;
94                 return 0;
95         case TC1100_INSTANCE_JOGDIAL:
96                 *out = (tmp == 1) ? 0 : 1;
97                 return 0;
98         default:
99                 return -ENODEV;
100         }
101 }
102
103 static int set_state(u32 *in, u8 instance)
104 {
105         u32 value;
106         acpi_status status;
107         struct acpi_buffer input;
108
109         if (!in)
110                 return -EINVAL;
111
112         if (instance > 2)
113                 return -ENODEV;
114
115         switch (instance) {
116         case TC1100_INSTANCE_WIRELESS:
117                 value = (*in) ? 1 : 2;
118                 break;
119         case TC1100_INSTANCE_JOGDIAL:
120                 value = (*in) ? 0 : 1;
121                 break;
122         default:
123                 return -ENODEV;
124         }
125
126         input.length = sizeof(u32);
127         input.pointer = &value;
128
129         status = wmi_set_block(GUID, instance, &input);
130         if (ACPI_FAILURE(status))
131                 return -ENODEV;
132
133         return 0;
134 }
135
136 /* --------------------------------------------------------------------------
137                                 FS Interface (/sys)
138    -------------------------------------------------------------------------- */
139
140 /*
141  * Read/ write bool sysfs macro
142  */
143 #define show_set_bool(value, instance) \
144 static ssize_t \
145 show_bool_##value(struct device *dev, struct device_attribute *attr, \
146         char *buf) \
147 { \
148         u32 result; \
149         acpi_status status = get_state(&result, instance); \
150         if (ACPI_SUCCESS(status)) \
151                 return sprintf(buf, "%d\n", result); \
152         return sprintf(buf, "Read error\n"); \
153 } \
154 \
155 static ssize_t \
156 set_bool_##value(struct device *dev, struct device_attribute *attr, \
157         const char *buf, size_t count) \
158 { \
159         u32 tmp = simple_strtoul(buf, NULL, 10); \
160         acpi_status status = set_state(&tmp, instance); \
161                 if (ACPI_FAILURE(status)) \
162                         return -EINVAL; \
163         return count; \
164 } \
165 static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
166         show_bool_##value, set_bool_##value);
167
168 show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
169 show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
170
171 static struct attribute *tc1100_attributes[] = {
172         &dev_attr_wireless.attr,
173         &dev_attr_jogdial.attr,
174         NULL
175 };
176
177 static struct attribute_group tc1100_attribute_group = {
178         .attrs  = tc1100_attributes,
179 };
180
181 /* --------------------------------------------------------------------------
182                                 Driver Model
183    -------------------------------------------------------------------------- */
184
185 static int __init tc1100_probe(struct platform_device *device)
186 {
187         return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
188 }
189
190
191 static int __devexit tc1100_remove(struct platform_device *device)
192 {
193         sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
194
195         return 0;
196 }
197
198 #ifdef CONFIG_PM
199 static int tc1100_suspend(struct device *dev)
200 {
201         int ret;
202
203         ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
204         if (ret)
205                 return ret;
206
207         ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
208         if (ret)
209                 return ret;
210
211         return 0;
212 }
213
214 static int tc1100_resume(struct device *dev)
215 {
216         int ret;
217
218         ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
219         if (ret)
220                 return ret;
221
222         ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
223         if (ret)
224                 return ret;
225
226         return 0;
227 }
228
229 static const struct dev_pm_ops tc1100_pm_ops = {
230         .suspend        = tc1100_suspend,
231         .resume         = tc1100_resume,
232         .freeze         = tc1100_suspend,
233         .restore        = tc1100_resume,
234 };
235 #endif
236
237 static struct platform_driver tc1100_driver = {
238         .driver = {
239                 .name = "tc1100-wmi",
240                 .owner = THIS_MODULE,
241 #ifdef CONFIG_PM
242                 .pm = &tc1100_pm_ops,
243 #endif
244         },
245         .remove = __devexit_p(tc1100_remove),
246 };
247
248 static int __init tc1100_init(void)
249 {
250         int error;
251
252         if (!wmi_has_guid(GUID))
253                 return -ENODEV;
254
255         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
256         if (!tc1100_device)
257                 return -ENOMEM;
258
259         error = platform_device_add(tc1100_device);
260         if (error)
261                 goto err_device_put;
262
263         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
264         if (error)
265                 goto err_device_del;
266
267         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
268         return 0;
269
270  err_device_del:
271         platform_device_del(tc1100_device);
272  err_device_put:
273         platform_device_put(tc1100_device);
274         return error;
275 }
276
277 static void __exit tc1100_exit(void)
278 {
279         platform_device_unregister(tc1100_device);
280         platform_driver_unregister(&tc1100_driver);
281 }
282
283 module_init(tc1100_init);
284 module_exit(tc1100_exit);