ideapad: let camera power control entry under platform driver
[linux-3.10.git] / drivers / platform / x86 / ideapad-laptop.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 #include <linux/platform_device.h>
31
32 #define IDEAPAD_DEV_CAMERA      0
33 #define IDEAPAD_DEV_WLAN        1
34 #define IDEAPAD_DEV_BLUETOOTH   2
35 #define IDEAPAD_DEV_3G          3
36 #define IDEAPAD_DEV_KILLSW      4
37
38 struct ideapad_private {
39         acpi_handle handle;
40         struct rfkill *rfk[5];
41         struct platform_device *platform_device;
42 } *ideapad_priv;
43
44 static struct {
45         char *name;
46         int cfgbit;
47         int opcode;
48         int type;
49 } ideapad_rfk_data[] = {
50         { "ideapad_camera",     19, 0x1E, NUM_RFKILL_TYPES },
51         { "ideapad_wlan",       18, 0x15, RFKILL_TYPE_WLAN },
52         { "ideapad_bluetooth",  16, 0x17, RFKILL_TYPE_BLUETOOTH },
53         { "ideapad_3g",         17, 0x20, RFKILL_TYPE_WWAN },
54         { "ideapad_killsw",     0,  0,    RFKILL_TYPE_WLAN }
55 };
56
57 static bool no_bt_rfkill;
58 module_param(no_bt_rfkill, bool, 0444);
59 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
60
61 /*
62  * ACPI Helpers
63  */
64 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
65
66 static int read_method_int(acpi_handle handle, const char *method, int *val)
67 {
68         acpi_status status;
69         unsigned long long result;
70
71         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
72         if (ACPI_FAILURE(status)) {
73                 *val = -1;
74                 return -1;
75         } else {
76                 *val = result;
77                 return 0;
78         }
79 }
80
81 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
82 {
83         acpi_status status;
84         unsigned long long result;
85         struct acpi_object_list params;
86         union acpi_object in_obj;
87
88         params.count = 1;
89         params.pointer = &in_obj;
90         in_obj.type = ACPI_TYPE_INTEGER;
91         in_obj.integer.value = cmd;
92
93         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
94
95         if (ACPI_FAILURE(status)) {
96                 *ret = -1;
97                 return -1;
98         } else {
99                 *ret = result;
100                 return 0;
101         }
102 }
103
104 static int method_vpcw(acpi_handle handle, int cmd, int data)
105 {
106         struct acpi_object_list params;
107         union acpi_object in_obj[2];
108         acpi_status status;
109
110         params.count = 2;
111         params.pointer = in_obj;
112         in_obj[0].type = ACPI_TYPE_INTEGER;
113         in_obj[0].integer.value = cmd;
114         in_obj[1].type = ACPI_TYPE_INTEGER;
115         in_obj[1].integer.value = data;
116
117         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
118         if (status != AE_OK)
119                 return -1;
120         return 0;
121 }
122
123 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
124 {
125         int val;
126         unsigned long int end_jiffies;
127
128         if (method_vpcw(handle, 1, cmd))
129                 return -1;
130
131         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
132              time_before(jiffies, end_jiffies);) {
133                 schedule();
134                 if (method_vpcr(handle, 1, &val))
135                         return -1;
136                 if (val == 0) {
137                         if (method_vpcr(handle, 0, &val))
138                                 return -1;
139                         *data = val;
140                         return 0;
141                 }
142         }
143         pr_err("timeout in read_ec_cmd\n");
144         return -1;
145 }
146
147 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
148 {
149         int val;
150         unsigned long int end_jiffies;
151
152         if (method_vpcw(handle, 0, data))
153                 return -1;
154         if (method_vpcw(handle, 1, cmd))
155                 return -1;
156
157         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
158              time_before(jiffies, end_jiffies);) {
159                 schedule();
160                 if (method_vpcr(handle, 1, &val))
161                         return -1;
162                 if (val == 0)
163                         return 0;
164         }
165         pr_err("timeout in write_ec_cmd\n");
166         return -1;
167 }
168 /* the above is ACPI helpers */
169
170 static ssize_t show_ideapad_cam(struct device *dev,
171                                 struct device_attribute *attr,
172                                 char *buf)
173 {
174         struct ideapad_private *priv = dev_get_drvdata(dev);
175         acpi_handle handle = priv->handle;
176         unsigned long result;
177
178         if (read_ec_data(handle, 0x1D, &result))
179                 return sprintf(buf, "-1\n");
180         return sprintf(buf, "%lu\n", result);
181 }
182
183 static ssize_t store_ideapad_cam(struct device *dev,
184                                  struct device_attribute *attr,
185                                  const char *buf, size_t count)
186 {
187         struct ideapad_private *priv = dev_get_drvdata(dev);
188         acpi_handle handle = priv->handle;
189         int ret, state;
190
191         if (!count)
192                 return 0;
193         if (sscanf(buf, "%i", &state) != 1)
194                 return -EINVAL;
195         ret = write_ec_cmd(handle, 0x1E, state);
196         if (ret < 0)
197                 return ret;
198         return count;
199 }
200
201 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
202
203 static int ideapad_rfk_set(void *data, bool blocked)
204 {
205         int device = (unsigned long)data;
206
207         if (device == IDEAPAD_DEV_KILLSW)
208                 return -EINVAL;
209
210         return write_ec_cmd(ideapad_priv->handle,
211                             ideapad_rfk_data[device].opcode,
212                             !blocked);
213 }
214
215 static struct rfkill_ops ideapad_rfk_ops = {
216         .set_block = ideapad_rfk_set,
217 };
218
219 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
220 {
221         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
222         acpi_handle handle = priv->handle;
223         unsigned long hw_blocked;
224         int i;
225
226         if (read_ec_data(handle, 0x23, &hw_blocked))
227                 return;
228         hw_blocked = !hw_blocked;
229
230         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
231                 if (priv->rfk[i])
232                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
233 }
234
235 static int ideapad_register_rfkill(struct acpi_device *adevice, int dev)
236 {
237         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
238         int ret;
239         unsigned long sw_blocked;
240
241         if (no_bt_rfkill &&
242             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
243                 /* Force to enable bluetooth when no_bt_rfkill=1 */
244                 write_ec_cmd(ideapad_priv->handle,
245                              ideapad_rfk_data[dev].opcode, 1);
246                 return 0;
247         }
248
249         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
250                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
251                                       (void *)(long)dev);
252         if (!priv->rfk[dev])
253                 return -ENOMEM;
254
255         if (read_ec_data(ideapad_priv->handle, ideapad_rfk_data[dev].opcode-1,
256                          &sw_blocked)) {
257                 rfkill_init_sw_state(priv->rfk[dev], 0);
258         } else {
259                 sw_blocked = !sw_blocked;
260                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
261         }
262
263         ret = rfkill_register(priv->rfk[dev]);
264         if (ret) {
265                 rfkill_destroy(priv->rfk[dev]);
266                 return ret;
267         }
268         return 0;
269 }
270
271 static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
272 {
273         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
274
275         if (!priv->rfk[dev])
276                 return;
277
278         rfkill_unregister(priv->rfk[dev]);
279         rfkill_destroy(priv->rfk[dev]);
280 }
281
282 /*
283  * Platform device
284  */
285 static struct attribute *ideapad_attributes[] = {
286         &dev_attr_camera_power.attr,
287         NULL
288 };
289
290 static struct attribute_group ideapad_attribute_group = {
291         .attrs = ideapad_attributes
292 };
293
294 static int __devinit ideapad_platform_init(void)
295 {
296         int result;
297
298         ideapad_priv->platform_device = platform_device_alloc("ideapad", -1);
299         if (!ideapad_priv->platform_device)
300                 return -ENOMEM;
301         platform_set_drvdata(ideapad_priv->platform_device, ideapad_priv);
302
303         result = platform_device_add(ideapad_priv->platform_device);
304         if (result)
305                 goto fail_platform_device;
306
307         result = sysfs_create_group(&ideapad_priv->platform_device->dev.kobj,
308                                     &ideapad_attribute_group);
309         if (result)
310                 goto fail_sysfs;
311         return 0;
312
313 fail_sysfs:
314         platform_device_del(ideapad_priv->platform_device);
315 fail_platform_device:
316         platform_device_put(ideapad_priv->platform_device);
317         return result;
318 }
319
320 static void ideapad_platform_exit(void)
321 {
322         sysfs_remove_group(&ideapad_priv->platform_device->dev.kobj,
323                            &ideapad_attribute_group);
324         platform_device_unregister(ideapad_priv->platform_device);
325 }
326 /* the above is platform device */
327
328 static const struct acpi_device_id ideapad_device_ids[] = {
329         { "VPC2004", 0},
330         { "", 0},
331 };
332 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
333
334 static int ideapad_acpi_add(struct acpi_device *adevice)
335 {
336         int ret, i, cfg;
337         struct ideapad_private *priv;
338
339         if (read_method_int(adevice->handle, "_CFG", &cfg))
340                 return -ENODEV;
341
342         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
343         if (!priv)
344                 return -ENOMEM;
345         ideapad_priv = priv;
346         priv->handle = adevice->handle;
347         dev_set_drvdata(&adevice->dev, priv);
348
349         ret = ideapad_platform_init();
350         if (ret)
351                 goto platform_failed;
352
353         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) {
354                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
355                         ideapad_register_rfkill(adevice, i);
356         }
357         ideapad_sync_rfk_state(adevice);
358
359         return 0;
360
361 platform_failed:
362         kfree(priv);
363         return ret;
364 }
365
366 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
367 {
368         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
369         int i;
370
371         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
372                 ideapad_unregister_rfkill(adevice, i);
373         ideapad_platform_exit();
374         dev_set_drvdata(&adevice->dev, NULL);
375         kfree(priv);
376
377         return 0;
378 }
379
380 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
381 {
382         acpi_handle handle = adevice->handle;
383         unsigned long vpc1, vpc2, vpc_bit;
384
385         if (read_ec_data(handle, 0x10, &vpc1))
386                 return;
387         if (read_ec_data(handle, 0x1A, &vpc2))
388                 return;
389
390         vpc1 = (vpc2 << 8) | vpc1;
391         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
392                 if (test_bit(vpc_bit, &vpc1)) {
393                         if (vpc_bit == 9)
394                                 ideapad_sync_rfk_state(adevice);
395                 }
396         }
397 }
398
399 static struct acpi_driver ideapad_acpi_driver = {
400         .name = "ideapad_acpi",
401         .class = "IdeaPad",
402         .ids = ideapad_device_ids,
403         .ops.add = ideapad_acpi_add,
404         .ops.remove = ideapad_acpi_remove,
405         .ops.notify = ideapad_acpi_notify,
406         .owner = THIS_MODULE,
407 };
408
409
410 static int __init ideapad_acpi_module_init(void)
411 {
412         acpi_bus_register_driver(&ideapad_acpi_driver);
413
414         return 0;
415 }
416
417
418 static void __exit ideapad_acpi_module_exit(void)
419 {
420         acpi_bus_unregister_driver(&ideapad_acpi_driver);
421
422 }
423
424 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
425 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
426 MODULE_LICENSE("GPL");
427
428 module_init(ideapad_acpi_module_init);
429 module_exit(ideapad_acpi_module_exit);