tc1100-wmi - switch to using dev_pm_ops
[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/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 struct platform_device *tc1100_device;
51
52 struct tc1100_data {
53         u32 wireless;
54         u32 jogdial;
55 };
56
57 static struct tc1100_data suspend_data;
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 && result.pointer)
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_IWUGO | 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 __devexit 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                 .owner = THIS_MODULE,
240 #ifdef CONFIG_PM
241                 .pm = &tc1100_pm_ops,
242 #endif
243         },
244         .remove = __devexit_p(tc1100_remove),
245 };
246
247 static int __init tc1100_init(void)
248 {
249         int error;
250
251         if (!wmi_has_guid(GUID))
252                 return -ENODEV;
253
254         tc1100_device = platform_device_alloc("tc1100-wmi", -1);
255         if (!tc1100_device)
256                 return -ENOMEM;
257
258         error = platform_device_add(tc1100_device);
259         if (error)
260                 goto err_device_put;
261
262         error = platform_driver_probe(&tc1100_driver, tc1100_probe);
263         if (error)
264                 goto err_device_del;
265
266         printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
267         return 0;
268
269  err_device_del:
270         platform_device_del(tc1100_device);
271  err_device_put:
272         platform_device_put(tc1100_device);
273         return error;
274 }
275
276 static void __exit tc1100_exit(void)
277 {
278         platform_device_unregister(tc1100_device);
279         platform_driver_unregister(&tc1100_driver);
280 }
281
282 module_init(tc1100_init);
283 module_exit(tc1100_exit);