ideapad: use EC command to control camera
[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         acpi_handle handle;
39         struct rfkill *rfk[5];
40 };
41
42 static struct {
43         char *name;
44         int cfgbit;
45         int type;
46 } ideapad_rfk_data[] = {
47         { "ideapad_camera",     19, NUM_RFKILL_TYPES },
48         { "ideapad_wlan",       18, RFKILL_TYPE_WLAN },
49         { "ideapad_bluetooth",  16, RFKILL_TYPE_BLUETOOTH },
50         { "ideapad_3g",         17, RFKILL_TYPE_WWAN },
51         { "ideapad_killsw",     0, RFKILL_TYPE_WLAN }
52 };
53
54 /*
55  * ACPI Helpers
56  */
57 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
58
59 static int read_method_int(acpi_handle handle, const char *method, int *val)
60 {
61         acpi_status status;
62         unsigned long long result;
63
64         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
65         if (ACPI_FAILURE(status)) {
66                 *val = -1;
67                 return -1;
68         } else {
69                 *val = result;
70                 return 0;
71         }
72 }
73
74 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
75 {
76         acpi_status status;
77         unsigned long long result;
78         struct acpi_object_list params;
79         union acpi_object in_obj;
80
81         params.count = 1;
82         params.pointer = &in_obj;
83         in_obj.type = ACPI_TYPE_INTEGER;
84         in_obj.integer.value = cmd;
85
86         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
87
88         if (ACPI_FAILURE(status)) {
89                 *ret = -1;
90                 return -1;
91         } else {
92                 *ret = result;
93                 return 0;
94         }
95 }
96
97 static int method_vpcw(acpi_handle handle, int cmd, int data)
98 {
99         struct acpi_object_list params;
100         union acpi_object in_obj[2];
101         acpi_status status;
102
103         params.count = 2;
104         params.pointer = in_obj;
105         in_obj[0].type = ACPI_TYPE_INTEGER;
106         in_obj[0].integer.value = cmd;
107         in_obj[1].type = ACPI_TYPE_INTEGER;
108         in_obj[1].integer.value = data;
109
110         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
111         if (status != AE_OK)
112                 return -1;
113         return 0;
114 }
115
116 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
117 {
118         int val;
119         unsigned long int end_jiffies;
120
121         if (method_vpcw(handle, 1, cmd))
122                 return -1;
123
124         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
125              time_before(jiffies, end_jiffies);) {
126                 schedule();
127                 if (method_vpcr(handle, 1, &val))
128                         return -1;
129                 if (val == 0) {
130                         if (method_vpcr(handle, 0, &val))
131                                 return -1;
132                         *data = val;
133                         return 0;
134                 }
135         }
136         pr_err("timeout in read_ec_cmd\n");
137         return -1;
138 }
139
140 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
141 {
142         int val;
143         unsigned long int end_jiffies;
144
145         if (method_vpcw(handle, 0, data))
146                 return -1;
147         if (method_vpcw(handle, 1, cmd))
148                 return -1;
149
150         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
151              time_before(jiffies, end_jiffies);) {
152                 schedule();
153                 if (method_vpcr(handle, 1, &val))
154                         return -1;
155                 if (val == 0)
156                         return 0;
157         }
158         pr_err("timeout in write_ec_cmd\n");
159         return -1;
160 }
161 /* the above is ACPI helpers */
162
163 static int ideapad_dev_get_state(int device)
164 {
165         acpi_status status;
166         union acpi_object in_param;
167         struct acpi_object_list input = { 1, &in_param };
168         struct acpi_buffer output;
169         union acpi_object out_obj;
170
171         output.length = sizeof(out_obj);
172         output.pointer = &out_obj;
173
174         in_param.type = ACPI_TYPE_INTEGER;
175         in_param.integer.value = device + 1;
176
177         status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
178         if (ACPI_FAILURE(status)) {
179                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
180                 return -ENODEV;
181         }
182         if (out_obj.type != ACPI_TYPE_INTEGER) {
183                 printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
184                 return -ENODEV;
185         }
186         return out_obj.integer.value;
187 }
188
189 static int ideapad_dev_set_state(int device, int state)
190 {
191         acpi_status status;
192         union acpi_object in_params[2];
193         struct acpi_object_list input = { 2, in_params };
194
195         in_params[0].type = ACPI_TYPE_INTEGER;
196         in_params[0].integer.value = device + 1;
197         in_params[1].type = ACPI_TYPE_INTEGER;
198         in_params[1].integer.value = state;
199
200         status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
201         if (ACPI_FAILURE(status)) {
202                 printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
203                 return -ENODEV;
204         }
205         return 0;
206 }
207 static ssize_t show_ideapad_cam(struct device *dev,
208                                 struct device_attribute *attr,
209                                 char *buf)
210 {
211         struct ideapad_private *priv = dev_get_drvdata(dev);
212         acpi_handle handle = priv->handle;
213         unsigned long result;
214
215         if (read_ec_data(handle, 0x1D, &result))
216                 return sprintf(buf, "-1\n");
217         return sprintf(buf, "%lu\n", result);
218 }
219
220 static ssize_t store_ideapad_cam(struct device *dev,
221                                  struct device_attribute *attr,
222                                  const char *buf, size_t count)
223 {
224         struct ideapad_private *priv = dev_get_drvdata(dev);
225         acpi_handle handle = priv->handle;
226         int ret, state;
227
228         if (!count)
229                 return 0;
230         if (sscanf(buf, "%i", &state) != 1)
231                 return -EINVAL;
232         ret = write_ec_cmd(handle, 0x1E, state);
233         if (ret < 0)
234                 return ret;
235         return count;
236 }
237
238 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
239
240 static int ideapad_rfk_set(void *data, bool blocked)
241 {
242         int device = (unsigned long)data;
243
244         if (device == IDEAPAD_DEV_KILLSW)
245                 return -EINVAL;
246         return ideapad_dev_set_state(device, !blocked);
247 }
248
249 static struct rfkill_ops ideapad_rfk_ops = {
250         .set_block = ideapad_rfk_set,
251 };
252
253 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
254 {
255         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
256         int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
257         int i;
258
259         rfkill_set_hw_state(priv->rfk[IDEAPAD_DEV_KILLSW], hw_blocked);
260         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
261                 if (priv->rfk[i])
262                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
263         if (hw_blocked)
264                 return;
265
266         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
267                 if (priv->rfk[i])
268                         rfkill_set_sw_state(priv->rfk[i], !ideapad_dev_get_state(i));
269 }
270
271 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
272 {
273         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
274         int ret;
275
276         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev-1].name, &adevice->dev,
277                                       ideapad_rfk_data[dev-1].type, &ideapad_rfk_ops,
278                                       (void *)(long)dev);
279         if (!priv->rfk[dev])
280                 return -ENOMEM;
281
282         ret = rfkill_register(priv->rfk[dev]);
283         if (ret) {
284                 rfkill_destroy(priv->rfk[dev]);
285                 return ret;
286         }
287         return 0;
288 }
289
290 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
291 {
292         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
293
294         if (!priv->rfk[dev])
295                 return;
296
297         rfkill_unregister(priv->rfk[dev]);
298         rfkill_destroy(priv->rfk[dev]);
299 }
300
301 static const struct acpi_device_id ideapad_device_ids[] = {
302         { "VPC2004", 0},
303         { "", 0},
304 };
305 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
306
307 static int ideapad_acpi_add(struct acpi_device *adevice)
308 {
309         int i, cfg;
310         int devs_present[5];
311         struct ideapad_private *priv;
312
313         if (read_method_int(adevice->handle, "_CFG", &cfg))
314                 return -ENODEV;
315
316         for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
317                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
318                         devs_present[i] = 1;
319                 else
320                         devs_present[i] = 0;
321         }
322
323         /* The hardware switch is always present */
324         devs_present[IDEAPAD_DEV_KILLSW] = 1;
325
326         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
327         if (!priv)
328                 return -ENOMEM;
329
330         if (devs_present[IDEAPAD_DEV_CAMERA]) {
331                 int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
332                 if (ret) {
333                         kfree(priv);
334                         return ret;
335                 }
336         }
337
338         priv->handle = adevice->handle;
339         dev_set_drvdata(&adevice->dev, priv);
340         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
341                 if (!devs_present[i])
342                         continue;
343
344                 ideapad_register_rfkill(adevice, i);
345         }
346         ideapad_sync_rfk_state(adevice);
347         return 0;
348 }
349
350 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
351 {
352         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
353         int i;
354
355         device_remove_file(&adevice->dev, &dev_attr_camera_power);
356
357         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
358                 ideapad_unregister_rfkill(adevice, i);
359
360         dev_set_drvdata(&adevice->dev, NULL);
361         kfree(priv);
362         return 0;
363 }
364
365 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
366 {
367         acpi_handle handle = adevice->handle;
368         unsigned long vpc1, vpc2, vpc_bit;
369
370         if (read_ec_data(handle, 0x10, &vpc1))
371                 return;
372         if (read_ec_data(handle, 0x1A, &vpc2))
373                 return;
374
375         vpc1 = (vpc2 << 8) | vpc1;
376         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
377                 if (test_bit(vpc_bit, &vpc1)) {
378                         if (vpc_bit == 9)
379                                 ideapad_sync_rfk_state(adevice);
380                 }
381         }
382 }
383
384 static struct acpi_driver ideapad_acpi_driver = {
385         .name = "ideapad_acpi",
386         .class = "IdeaPad",
387         .ids = ideapad_device_ids,
388         .ops.add = ideapad_acpi_add,
389         .ops.remove = ideapad_acpi_remove,
390         .ops.notify = ideapad_acpi_notify,
391         .owner = THIS_MODULE,
392 };
393
394
395 static int __init ideapad_acpi_module_init(void)
396 {
397         acpi_bus_register_driver(&ideapad_acpi_driver);
398
399         return 0;
400 }
401
402
403 static void __exit ideapad_acpi_module_exit(void)
404 {
405         acpi_bus_unregister_driver(&ideapad_acpi_driver);
406
407 }
408
409 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
410 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
411 MODULE_LICENSE("GPL");
412
413 module_init(ideapad_acpi_module_init);
414 module_exit(ideapad_acpi_module_exit);