ideapad: Stop using global variables
[linux-2.6.git] / drivers / platform / x86 / ideapad_acpi.c
1 /*
2  *  ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
3  *
4  *  Copyright © 2010 Intel Corporation
5  *  Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License, or
10  *  (at your option) any later version.
11  *
12  *  This program is distributed in the hope that it will be useful,
13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *  GNU General Public License for more details.
16  *
17  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, write to the Free Software
19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20  *  02110-1301, USA.
21  */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <acpi/acpi_bus.h>
28 #include <acpi/acpi_drivers.h>
29 #include <linux/rfkill.h>
30
31 #define IDEAPAD_DEV_CAMERA      0
32 #define IDEAPAD_DEV_WLAN        1
33 #define IDEAPAD_DEV_BLUETOOTH   2
34 #define IDEAPAD_DEV_3G          3
35 #define IDEAPAD_DEV_KILLSW      4
36
37 struct ideapad_private {
38         struct rfkill *rfk[5];
39 };
40
41 static struct {
42         char *name;
43         int type;
44 } ideapad_rfk_data[] = {
45         /* camera has no rfkill */
46         { "ideapad_wlan",       RFKILL_TYPE_WLAN },
47         { "ideapad_bluetooth",  RFKILL_TYPE_BLUETOOTH },
48         { "ideapad_3g",         RFKILL_TYPE_WWAN },
49         { "ideapad_killsw",     RFKILL_TYPE_WLAN }
50 };
51
52 static int ideapad_dev_exists(int device)
53 {
54         acpi_status status;
55         union acpi_object in_param;
56         struct acpi_object_list input = { 1, &in_param };
57         struct acpi_buffer output;
58         union acpi_object out_obj;
59
60         output.length = sizeof(out_obj);
61         output.pointer = &out_obj;
62
63         in_param.type = ACPI_TYPE_INTEGER;
64         in_param.integer.value = device + 1;
65
66         status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
67         if (ACPI_FAILURE(status)) {
68                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
69                 return -ENODEV;
70         }
71         if (out_obj.type != ACPI_TYPE_INTEGER) {
72                 printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
73                 return -ENODEV;
74         }
75         return out_obj.integer.value;
76 }
77
78 static int ideapad_dev_get_state(int device)
79 {
80         acpi_status status;
81         union acpi_object in_param;
82         struct acpi_object_list input = { 1, &in_param };
83         struct acpi_buffer output;
84         union acpi_object out_obj;
85
86         output.length = sizeof(out_obj);
87         output.pointer = &out_obj;
88
89         in_param.type = ACPI_TYPE_INTEGER;
90         in_param.integer.value = device + 1;
91
92         status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
93         if (ACPI_FAILURE(status)) {
94                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
95                 return -ENODEV;
96         }
97         if (out_obj.type != ACPI_TYPE_INTEGER) {
98                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
99                 return -ENODEV;
100         }
101         return out_obj.integer.value;
102 }
103
104 static int ideapad_dev_set_state(int device, int state)
105 {
106         acpi_status status;
107         union acpi_object in_params[2];
108         struct acpi_object_list input = { 2, in_params };
109
110         in_params[0].type = ACPI_TYPE_INTEGER;
111         in_params[0].integer.value = device + 1;
112         in_params[1].type = ACPI_TYPE_INTEGER;
113         in_params[1].integer.value = state;
114
115         status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
116         if (ACPI_FAILURE(status)) {
117                 printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
118                 return -ENODEV;
119         }
120         return 0;
121 }
122 static ssize_t show_ideapad_cam(struct device *dev,
123                                 struct device_attribute *attr,
124                                 char *buf)
125 {
126         int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
127         if (state < 0)
128                 return state;
129
130         return sprintf(buf, "%d\n", state);
131 }
132
133 static ssize_t store_ideapad_cam(struct device *dev,
134                                  struct device_attribute *attr,
135                                  const char *buf, size_t count)
136 {
137         int ret, state;
138
139         if (!count)
140                 return 0;
141         if (sscanf(buf, "%i", &state) != 1)
142                 return -EINVAL;
143         ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state);
144         if (ret < 0)
145                 return ret;
146         return count;
147 }
148
149 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
150
151 static int ideapad_rfk_set(void *data, bool blocked)
152 {
153         int device = (unsigned long)data;
154
155         if (device == IDEAPAD_DEV_KILLSW)
156                 return -EINVAL;
157         return ideapad_dev_set_state(device, !blocked);
158 }
159
160 static struct rfkill_ops ideapad_rfk_ops = {
161         .set_block = ideapad_rfk_set,
162 };
163
164 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
165 {
166         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
167         int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
168         int i;
169
170         rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], hw_blocked);
171         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
172                 if (priv->rfk[i])
173                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
174         if (hw_blocked)
175                 return;
176
177         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
178                 if (priv->rfk[i])
179                         rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
180 }
181
182 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
183 {
184         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
185         int ret;
186
187         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
188                                       ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
189                                       (void *)(long)dev);
190         if (!priv->rfk[dev])
191                 return -ENOMEM;
192
193         ret = rfkill_register(priv->rfk[dev]);
194         if (ret) {
195                 rfkill_destroy(priv->rfk[dev]);
196                 return ret;
197         }
198         return 0;
199 }
200
201 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
202 {
203         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
204
205         if (!priv->rfk[dev])
206                 return;
207
208         rfkill_unregister(priv->rfk[dev]);
209         rfkill_destroy(priv->rfk[dev]);
210 }
211
212 static const struct acpi_device_id ideapad_device_ids[] = {
213         { "VPC2004", 0},
214         { "", 0},
215 };
216 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
217
218 static int ideapad_acpi_add(struct acpi_device *adevice)
219 {
220         int i;
221         int devs_present[5];
222         struct ideapad_private *priv;
223
224         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
225                 devs_present[i] = ideapad_dev_exists(i);
226                 if (devs_present[i] < 0)
227                         return devs_present[i];
228         }
229
230         /* The hardware switch is always present */
231         devs_present[IDEAPAD_DEV_KILLSW] = 1;
232
233         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
234         if (!priv)
235                 return -ENOMEM;
236
237         if (devs_present[IDEAPAD_DEV_CAMERA]) {
238                 int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
239                 if (ret) {
240                         kfree(priv);
241                         return ret;
242                 }
243         }
244
245         dev_set_drvdata(&adevice->dev, priv);
246         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
247                 if (!devs_present[i])
248                         continue;
249
250                 ideapad_register_rfkill(adevice, i);
251         }
252         ideapad_sync_rfk_state(adevice);
253         return 0;
254 }
255
256 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
257 {
258         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
259         int i;
260
261         device_remove_file(&adevice->dev, &dev_attr_camera_power);
262
263         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
264                 ideapad_unregister_rfkill(adevice, i);
265
266         dev_set_drvdata(&adevice->dev, NULL);
267         kfree(priv);
268         return 0;
269 }
270
271 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
272 {
273         ideapad_sync_rfk_state(adevice);
274 }
275
276 static struct acpi_driver ideapad_acpi_driver = {
277         .name = "ideapad_acpi",
278         .class = "IdeaPad",
279         .ids = ideapad_device_ids,
280         .ops.add = ideapad_acpi_add,
281         .ops.remove = ideapad_acpi_remove,
282         .ops.notify = ideapad_acpi_notify,
283         .owner = THIS_MODULE,
284 };
285
286
287 static int __init ideapad_acpi_module_init(void)
288 {
289         acpi_bus_register_driver(&ideapad_acpi_driver);
290
291         return 0;
292 }
293
294
295 static void __exit ideapad_acpi_module_exit(void)
296 {
297         acpi_bus_unregister_driver(&ideapad_acpi_driver);
298
299 }
300
301 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
302 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
303 MODULE_LICENSE("GPL");
304
305 module_init(ideapad_acpi_module_init);
306 module_exit(ideapad_acpi_module_exit);