ideapad: let camera_power node invisiable if no camera
[linux-2.6.git] / drivers / platform / x86 / ideapad-laptop.c
1 /*
2  *  ideapad-laptop.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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <acpi/acpi_bus.h>
30 #include <acpi/acpi_drivers.h>
31 #include <linux/rfkill.h>
32 #include <linux/platform_device.h>
33 #include <linux/input.h>
34 #include <linux/input/sparse-keymap.h>
35
36 #define IDEAPAD_RFKILL_DEV_NUM  (3)
37
38 #define CFG_BT_BIT      (16)
39 #define CFG_3G_BIT      (17)
40 #define CFG_WIFI_BIT    (18)
41 #define CFG_CAMERA_BIT  (19)
42
43 struct ideapad_private {
44         struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
45         struct platform_device *platform_device;
46         struct input_dev *inputdev;
47         unsigned long cfg;
48 };
49
50 static acpi_handle ideapad_handle;
51 static bool no_bt_rfkill;
52 module_param(no_bt_rfkill, bool, 0444);
53 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
54
55 /*
56  * ACPI Helpers
57  */
58 #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
59
60 static int read_method_int(acpi_handle handle, const char *method, int *val)
61 {
62         acpi_status status;
63         unsigned long long result;
64
65         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
66         if (ACPI_FAILURE(status)) {
67                 *val = -1;
68                 return -1;
69         } else {
70                 *val = result;
71                 return 0;
72         }
73 }
74
75 static int method_vpcr(acpi_handle handle, int cmd, int *ret)
76 {
77         acpi_status status;
78         unsigned long long result;
79         struct acpi_object_list params;
80         union acpi_object in_obj;
81
82         params.count = 1;
83         params.pointer = &in_obj;
84         in_obj.type = ACPI_TYPE_INTEGER;
85         in_obj.integer.value = cmd;
86
87         status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
88
89         if (ACPI_FAILURE(status)) {
90                 *ret = -1;
91                 return -1;
92         } else {
93                 *ret = result;
94                 return 0;
95         }
96 }
97
98 static int method_vpcw(acpi_handle handle, int cmd, int data)
99 {
100         struct acpi_object_list params;
101         union acpi_object in_obj[2];
102         acpi_status status;
103
104         params.count = 2;
105         params.pointer = in_obj;
106         in_obj[0].type = ACPI_TYPE_INTEGER;
107         in_obj[0].integer.value = cmd;
108         in_obj[1].type = ACPI_TYPE_INTEGER;
109         in_obj[1].integer.value = data;
110
111         status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
112         if (status != AE_OK)
113                 return -1;
114         return 0;
115 }
116
117 static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
118 {
119         int val;
120         unsigned long int end_jiffies;
121
122         if (method_vpcw(handle, 1, cmd))
123                 return -1;
124
125         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
126              time_before(jiffies, end_jiffies);) {
127                 schedule();
128                 if (method_vpcr(handle, 1, &val))
129                         return -1;
130                 if (val == 0) {
131                         if (method_vpcr(handle, 0, &val))
132                                 return -1;
133                         *data = val;
134                         return 0;
135                 }
136         }
137         pr_err("timeout in read_ec_cmd\n");
138         return -1;
139 }
140
141 static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
142 {
143         int val;
144         unsigned long int end_jiffies;
145
146         if (method_vpcw(handle, 0, data))
147                 return -1;
148         if (method_vpcw(handle, 1, cmd))
149                 return -1;
150
151         for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
152              time_before(jiffies, end_jiffies);) {
153                 schedule();
154                 if (method_vpcr(handle, 1, &val))
155                         return -1;
156                 if (val == 0)
157                         return 0;
158         }
159         pr_err("timeout in write_ec_cmd\n");
160         return -1;
161 }
162
163 /*
164  * sysfs
165  */
166 static ssize_t show_ideapad_cam(struct device *dev,
167                                 struct device_attribute *attr,
168                                 char *buf)
169 {
170         unsigned long result;
171
172         if (read_ec_data(ideapad_handle, 0x1D, &result))
173                 return sprintf(buf, "-1\n");
174         return sprintf(buf, "%lu\n", result);
175 }
176
177 static ssize_t store_ideapad_cam(struct device *dev,
178                                  struct device_attribute *attr,
179                                  const char *buf, size_t count)
180 {
181         int ret, state;
182
183         if (!count)
184                 return 0;
185         if (sscanf(buf, "%i", &state) != 1)
186                 return -EINVAL;
187         ret = write_ec_cmd(ideapad_handle, 0x1E, state);
188         if (ret < 0)
189                 return ret;
190         return count;
191 }
192
193 static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
194
195 static ssize_t show_ideapad_cfg(struct device *dev,
196                                 struct device_attribute *attr,
197                                 char *buf)
198 {
199         struct ideapad_private *priv = dev_get_drvdata(dev);
200
201         return sprintf(buf, "0x%.8lX\n", priv->cfg);
202 }
203
204 static DEVICE_ATTR(cfg, 0444, show_ideapad_cfg, NULL);
205
206 static struct attribute *ideapad_attributes[] = {
207         &dev_attr_camera_power.attr,
208         &dev_attr_cfg.attr,
209         NULL
210 };
211
212 static mode_t ideapad_is_visible(struct kobject *kobj,
213                                  struct attribute *attr,
214                                  int idx)
215 {
216         struct device *dev = container_of(kobj, struct device, kobj);
217         struct ideapad_private *priv = dev_get_drvdata(dev);
218         bool supported;
219
220         if (attr == &dev_attr_camera_power.attr)
221                 supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
222         else
223                 supported = true;
224
225         return supported ? attr->mode : 0;
226 }
227
228 static struct attribute_group ideapad_attribute_group = {
229         .is_visible = ideapad_is_visible,
230         .attrs = ideapad_attributes
231 };
232
233 /*
234  * Rfkill
235  */
236 struct ideapad_rfk_data {
237         char *name;
238         int cfgbit;
239         int opcode;
240         int type;
241 };
242
243 const struct ideapad_rfk_data ideapad_rfk_data[] = {
244         { "ideapad_wlan",      CFG_WIFI_BIT, 0x15, RFKILL_TYPE_WLAN },
245         { "ideapad_bluetooth", CFG_BT_BIT,   0x17, RFKILL_TYPE_BLUETOOTH },
246         { "ideapad_3g",        CFG_3G_BIT,   0x20, RFKILL_TYPE_WWAN },
247 };
248
249 static int ideapad_rfk_set(void *data, bool blocked)
250 {
251         unsigned long opcode = (unsigned long)data;
252
253         return write_ec_cmd(ideapad_handle, opcode, !blocked);
254 }
255
256 static struct rfkill_ops ideapad_rfk_ops = {
257         .set_block = ideapad_rfk_set,
258 };
259
260 static void ideapad_sync_rfk_state(struct acpi_device *adevice)
261 {
262         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
263         unsigned long hw_blocked;
264         int i;
265
266         if (read_ec_data(ideapad_handle, 0x23, &hw_blocked))
267                 return;
268         hw_blocked = !hw_blocked;
269
270         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
271                 if (priv->rfk[i])
272                         rfkill_set_hw_state(priv->rfk[i], hw_blocked);
273 }
274
275 static int __devinit ideapad_register_rfkill(struct acpi_device *adevice,
276                                              int dev)
277 {
278         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
279         int ret;
280         unsigned long sw_blocked;
281
282         if (no_bt_rfkill &&
283             (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
284                 /* Force to enable bluetooth when no_bt_rfkill=1 */
285                 write_ec_cmd(ideapad_handle,
286                              ideapad_rfk_data[dev].opcode, 1);
287                 return 0;
288         }
289
290         priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name, &adevice->dev,
291                                       ideapad_rfk_data[dev].type, &ideapad_rfk_ops,
292                                       (void *)(long)dev);
293         if (!priv->rfk[dev])
294                 return -ENOMEM;
295
296         if (read_ec_data(ideapad_handle, ideapad_rfk_data[dev].opcode-1,
297                          &sw_blocked)) {
298                 rfkill_init_sw_state(priv->rfk[dev], 0);
299         } else {
300                 sw_blocked = !sw_blocked;
301                 rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
302         }
303
304         ret = rfkill_register(priv->rfk[dev]);
305         if (ret) {
306                 rfkill_destroy(priv->rfk[dev]);
307                 return ret;
308         }
309         return 0;
310 }
311
312 static void __devexit ideapad_unregister_rfkill(struct acpi_device *adevice,
313                                                 int dev)
314 {
315         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
316
317         if (!priv->rfk[dev])
318                 return;
319
320         rfkill_unregister(priv->rfk[dev]);
321         rfkill_destroy(priv->rfk[dev]);
322 }
323
324 /*
325  * Platform device
326  */
327 static int __devinit ideapad_platform_init(struct ideapad_private *priv)
328 {
329         int result;
330
331         priv->platform_device = platform_device_alloc("ideapad", -1);
332         if (!priv->platform_device)
333                 return -ENOMEM;
334         platform_set_drvdata(priv->platform_device, priv);
335
336         result = platform_device_add(priv->platform_device);
337         if (result)
338                 goto fail_platform_device;
339
340         result = sysfs_create_group(&priv->platform_device->dev.kobj,
341                                     &ideapad_attribute_group);
342         if (result)
343                 goto fail_sysfs;
344         return 0;
345
346 fail_sysfs:
347         platform_device_del(priv->platform_device);
348 fail_platform_device:
349         platform_device_put(priv->platform_device);
350         return result;
351 }
352
353 static void ideapad_platform_exit(struct ideapad_private *priv)
354 {
355         sysfs_remove_group(&priv->platform_device->dev.kobj,
356                            &ideapad_attribute_group);
357         platform_device_unregister(priv->platform_device);
358 }
359
360 /*
361  * input device
362  */
363 static const struct key_entry ideapad_keymap[] = {
364         { KE_KEY, 0x06, { KEY_SWITCHVIDEOMODE } },
365         { KE_KEY, 0x0D, { KEY_WLAN } },
366         { KE_END, 0 },
367 };
368
369 static int __devinit ideapad_input_init(struct ideapad_private *priv)
370 {
371         struct input_dev *inputdev;
372         int error;
373
374         inputdev = input_allocate_device();
375         if (!inputdev) {
376                 pr_info("Unable to allocate input device\n");
377                 return -ENOMEM;
378         }
379
380         inputdev->name = "Ideapad extra buttons";
381         inputdev->phys = "ideapad/input0";
382         inputdev->id.bustype = BUS_HOST;
383         inputdev->dev.parent = &priv->platform_device->dev;
384
385         error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
386         if (error) {
387                 pr_err("Unable to setup input device keymap\n");
388                 goto err_free_dev;
389         }
390
391         error = input_register_device(inputdev);
392         if (error) {
393                 pr_err("Unable to register input device\n");
394                 goto err_free_keymap;
395         }
396
397         priv->inputdev = inputdev;
398         return 0;
399
400 err_free_keymap:
401         sparse_keymap_free(inputdev);
402 err_free_dev:
403         input_free_device(inputdev);
404         return error;
405 }
406
407 static void __devexit ideapad_input_exit(struct ideapad_private *priv)
408 {
409         sparse_keymap_free(priv->inputdev);
410         input_unregister_device(priv->inputdev);
411         priv->inputdev = NULL;
412 }
413
414 static void ideapad_input_report(struct ideapad_private *priv,
415                                  unsigned long scancode)
416 {
417         sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
418 }
419
420 /*
421  * module init/exit
422  */
423 static const struct acpi_device_id ideapad_device_ids[] = {
424         { "VPC2004", 0},
425         { "", 0},
426 };
427 MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
428
429 static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
430 {
431         int ret, i;
432         unsigned long cfg;
433         struct ideapad_private *priv;
434
435         if (read_method_int(adevice->handle, "_CFG", (int *)&cfg))
436                 return -ENODEV;
437
438         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
439         if (!priv)
440                 return -ENOMEM;
441         dev_set_drvdata(&adevice->dev, priv);
442         ideapad_handle = adevice->handle;
443         priv->cfg = cfg;
444
445         ret = ideapad_platform_init(priv);
446         if (ret)
447                 goto platform_failed;
448
449         ret = ideapad_input_init(priv);
450         if (ret)
451                 goto input_failed;
452
453         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
454                 if (test_bit(ideapad_rfk_data[i].cfgbit, &cfg))
455                         ideapad_register_rfkill(adevice, i);
456                 else
457                         priv->rfk[i] = NULL;
458         }
459         ideapad_sync_rfk_state(adevice);
460
461         return 0;
462
463 input_failed:
464         ideapad_platform_exit(priv);
465 platform_failed:
466         kfree(priv);
467         return ret;
468 }
469
470 static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
471 {
472         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
473         int i;
474
475         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
476                 ideapad_unregister_rfkill(adevice, i);
477         ideapad_input_exit(priv);
478         ideapad_platform_exit(priv);
479         dev_set_drvdata(&adevice->dev, NULL);
480         kfree(priv);
481
482         return 0;
483 }
484
485 static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
486 {
487         struct ideapad_private *priv = dev_get_drvdata(&adevice->dev);
488         acpi_handle handle = adevice->handle;
489         unsigned long vpc1, vpc2, vpc_bit;
490
491         if (read_ec_data(handle, 0x10, &vpc1))
492                 return;
493         if (read_ec_data(handle, 0x1A, &vpc2))
494                 return;
495
496         vpc1 = (vpc2 << 8) | vpc1;
497         for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
498                 if (test_bit(vpc_bit, &vpc1)) {
499                         if (vpc_bit == 9)
500                                 ideapad_sync_rfk_state(adevice);
501                         else if (vpc_bit == 4)
502                                 read_ec_data(handle, 0x12, &vpc2);
503                         else
504                                 ideapad_input_report(priv, vpc_bit);
505                 }
506         }
507 }
508
509 static struct acpi_driver ideapad_acpi_driver = {
510         .name = "ideapad_acpi",
511         .class = "IdeaPad",
512         .ids = ideapad_device_ids,
513         .ops.add = ideapad_acpi_add,
514         .ops.remove = ideapad_acpi_remove,
515         .ops.notify = ideapad_acpi_notify,
516         .owner = THIS_MODULE,
517 };
518
519 static int __init ideapad_acpi_module_init(void)
520 {
521         return acpi_bus_register_driver(&ideapad_acpi_driver);
522 }
523
524 static void __exit ideapad_acpi_module_exit(void)
525 {
526         acpi_bus_unregister_driver(&ideapad_acpi_driver);
527 }
528
529 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
530 MODULE_DESCRIPTION("IdeaPad ACPI Extras");
531 MODULE_LICENSE("GPL");
532
533 module_init(ideapad_acpi_module_init);
534 module_exit(ideapad_acpi_module_exit);