1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/types.h>
30#include <linux/proc_fs.h>
31#include <linux/seq_file.h>
32#include <linux/input.h>
33#include <acpi/acpi_bus.h>
34#include <acpi/acpi_drivers.h>
35
36#define PREFIX "ACPI: "
37
38#define ACPI_BUTTON_CLASS "button"
39#define ACPI_BUTTON_FILE_INFO "info"
40#define ACPI_BUTTON_FILE_STATE "state"
41#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
42#define ACPI_BUTTON_NOTIFY_STATUS 0x80
43
44#define ACPI_BUTTON_SUBCLASS_POWER "power"
45#define ACPI_BUTTON_HID_POWER "PNP0C0C"
46#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
47#define ACPI_BUTTON_TYPE_POWER 0x01
48
49#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
50#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
51#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
52#define ACPI_BUTTON_TYPE_SLEEP 0x03
53
54#define ACPI_BUTTON_SUBCLASS_LID "lid"
55#define ACPI_BUTTON_HID_LID "PNP0C0D"
56#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
57#define ACPI_BUTTON_TYPE_LID 0x05
58
59#define _COMPONENT ACPI_BUTTON_COMPONENT
60ACPI_MODULE_NAME("button");
61
62MODULE_AUTHOR("Paul Diefenbaugh");
63MODULE_DESCRIPTION("ACPI Button Driver");
64MODULE_LICENSE("GPL");
65
66static const struct acpi_device_id button_device_ids[] = {
67 {ACPI_BUTTON_HID_LID, 0},
68 {ACPI_BUTTON_HID_SLEEP, 0},
69 {ACPI_BUTTON_HID_SLEEPF, 0},
70 {ACPI_BUTTON_HID_POWER, 0},
71 {ACPI_BUTTON_HID_POWERF, 0},
72 {"", 0},
73};
74MODULE_DEVICE_TABLE(acpi, button_device_ids);
75
76static int acpi_button_add(struct acpi_device *device);
77static int acpi_button_remove(struct acpi_device *device, int type);
78static int acpi_button_resume(struct acpi_device *device);
79static void acpi_button_notify(struct acpi_device *device, u32 event);
80static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
81static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
82
83static struct acpi_driver acpi_button_driver = {
84 .name = "button",
85 .class = ACPI_BUTTON_CLASS,
86 .ids = button_device_ids,
87 .ops = {
88 .add = acpi_button_add,
89 .resume = acpi_button_resume,
90 .remove = acpi_button_remove,
91 .notify = acpi_button_notify,
92 },
93};
94
95struct acpi_button {
96 unsigned int type;
97 struct input_dev *input;
98 char phys[32];
99 unsigned long pushed;
100};
101
102static const struct file_operations acpi_button_info_fops = {
103 .owner = THIS_MODULE,
104 .open = acpi_button_info_open_fs,
105 .read = seq_read,
106 .llseek = seq_lseek,
107 .release = single_release,
108};
109
110static const struct file_operations acpi_button_state_fops = {
111 .owner = THIS_MODULE,
112 .open = acpi_button_state_open_fs,
113 .read = seq_read,
114 .llseek = seq_lseek,
115 .release = single_release,
116};
117
118static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
119static struct acpi_device *lid_device;
120
121
122
123
124
125static struct proc_dir_entry *acpi_button_dir;
126
127static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
128{
129 struct acpi_device *device = seq->private;
130
131 seq_printf(seq, "type: %s\n",
132 acpi_device_name(device));
133 return 0;
134}
135
136static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
137{
138 return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
139}
140
141static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
142{
143 struct acpi_device *device = seq->private;
144 acpi_status status;
145 unsigned long long state;
146
147 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
148 seq_printf(seq, "state: %s\n",
149 ACPI_FAILURE(status) ? "unsupported" :
150 (state ? "open" : "closed"));
151 return 0;
152}
153
154static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
155{
156 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
157}
158
159static struct proc_dir_entry *acpi_power_dir;
160static struct proc_dir_entry *acpi_sleep_dir;
161static struct proc_dir_entry *acpi_lid_dir;
162
163static int acpi_button_add_fs(struct acpi_device *device)
164{
165 struct acpi_button *button = acpi_driver_data(device);
166 struct proc_dir_entry *entry = NULL;
167
168 switch (button->type) {
169 case ACPI_BUTTON_TYPE_POWER:
170 if (!acpi_power_dir)
171 acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
172 acpi_button_dir);
173 entry = acpi_power_dir;
174 break;
175 case ACPI_BUTTON_TYPE_SLEEP:
176 if (!acpi_sleep_dir)
177 acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
178 acpi_button_dir);
179 entry = acpi_sleep_dir;
180 break;
181 case ACPI_BUTTON_TYPE_LID:
182 if (!acpi_lid_dir)
183 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
184 acpi_button_dir);
185 entry = acpi_lid_dir;
186 break;
187 }
188
189 if (!entry)
190 return -ENODEV;
191
192 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
193 if (!acpi_device_dir(device))
194 return -ENODEV;
195
196
197 entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
198 S_IRUGO, acpi_device_dir(device),
199 &acpi_button_info_fops, device);
200 if (!entry)
201 return -ENODEV;
202
203
204 if (button->type == ACPI_BUTTON_TYPE_LID) {
205 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
206 S_IRUGO, acpi_device_dir(device),
207 &acpi_button_state_fops, device);
208 if (!entry)
209 return -ENODEV;
210 }
211
212 return 0;
213}
214
215static int acpi_button_remove_fs(struct acpi_device *device)
216{
217 struct acpi_button *button = acpi_driver_data(device);
218
219 if (acpi_device_dir(device)) {
220 if (button->type == ACPI_BUTTON_TYPE_LID)
221 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
222 acpi_device_dir(device));
223 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
224 acpi_device_dir(device));
225
226 remove_proc_entry(acpi_device_bid(device),
227 acpi_device_dir(device)->parent);
228 acpi_device_dir(device) = NULL;
229 }
230
231 return 0;
232}
233
234
235
236
237int acpi_lid_notifier_register(struct notifier_block *nb)
238{
239 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
240}
241EXPORT_SYMBOL(acpi_lid_notifier_register);
242
243int acpi_lid_notifier_unregister(struct notifier_block *nb)
244{
245 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
246}
247EXPORT_SYMBOL(acpi_lid_notifier_unregister);
248
249int acpi_lid_open(void)
250{
251 acpi_status status;
252 unsigned long long state;
253
254 if (!lid_device)
255 return -ENODEV;
256
257 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
258 &state);
259 if (ACPI_FAILURE(status))
260 return -ENODEV;
261
262 return !!state;
263}
264EXPORT_SYMBOL(acpi_lid_open);
265
266static int acpi_lid_send_state(struct acpi_device *device)
267{
268 struct acpi_button *button = acpi_driver_data(device);
269 unsigned long long state;
270 acpi_status status;
271 int ret;
272
273 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
274 if (ACPI_FAILURE(status))
275 return -ENODEV;
276
277
278 input_report_switch(button->input, SW_LID, !state);
279 input_sync(button->input);
280
281 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
282 if (ret == NOTIFY_DONE)
283 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
284 device);
285 return ret;
286}
287
288static void acpi_button_notify(struct acpi_device *device, u32 event)
289{
290 struct acpi_button *button = acpi_driver_data(device);
291 struct input_dev *input;
292
293 switch (event) {
294 case ACPI_FIXED_HARDWARE_EVENT:
295 event = ACPI_BUTTON_NOTIFY_STATUS;
296
297 case ACPI_BUTTON_NOTIFY_STATUS:
298 input = button->input;
299 if (button->type == ACPI_BUTTON_TYPE_LID) {
300 acpi_lid_send_state(device);
301 } else {
302 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
303 KEY_SLEEP : KEY_POWER;
304
305 input_report_key(input, keycode, 1);
306 input_sync(input);
307 input_report_key(input, keycode, 0);
308 input_sync(input);
309 }
310
311 acpi_bus_generate_proc_event(device, event, ++button->pushed);
312 break;
313 default:
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315 "Unsupported event [0x%x]\n", event));
316 break;
317 }
318}
319
320static int acpi_button_resume(struct acpi_device *device)
321{
322 struct acpi_button *button = acpi_driver_data(device);
323
324 if (button->type == ACPI_BUTTON_TYPE_LID)
325 return acpi_lid_send_state(device);
326 return 0;
327}
328
329static int acpi_button_add(struct acpi_device *device)
330{
331 struct acpi_button *button;
332 struct input_dev *input;
333 char *hid, *name, *class;
334 int error;
335
336 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
337 if (!button)
338 return -ENOMEM;
339
340 device->driver_data = button;
341
342 button->input = input = input_allocate_device();
343 if (!input) {
344 error = -ENOMEM;
345 goto err_free_button;
346 }
347
348 hid = acpi_device_hid(device);
349 name = acpi_device_name(device);
350 class = acpi_device_class(device);
351
352 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
353 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
354 button->type = ACPI_BUTTON_TYPE_POWER;
355 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
356 sprintf(class, "%s/%s",
357 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
358 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
359 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
360 button->type = ACPI_BUTTON_TYPE_SLEEP;
361 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
362 sprintf(class, "%s/%s",
363 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
364 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
365 button->type = ACPI_BUTTON_TYPE_LID;
366 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
367 sprintf(class, "%s/%s",
368 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
369 } else {
370 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
371 error = -ENODEV;
372 goto err_free_input;
373 }
374
375 error = acpi_button_add_fs(device);
376 if (error)
377 goto err_free_input;
378
379 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
380
381 input->name = name;
382 input->phys = button->phys;
383 input->id.bustype = BUS_HOST;
384 input->id.product = button->type;
385 input->dev.parent = &device->dev;
386
387 switch (button->type) {
388 case ACPI_BUTTON_TYPE_POWER:
389 input->evbit[0] = BIT_MASK(EV_KEY);
390 set_bit(KEY_POWER, input->keybit);
391 break;
392
393 case ACPI_BUTTON_TYPE_SLEEP:
394 input->evbit[0] = BIT_MASK(EV_KEY);
395 set_bit(KEY_SLEEP, input->keybit);
396 break;
397
398 case ACPI_BUTTON_TYPE_LID:
399 input->evbit[0] = BIT_MASK(EV_SW);
400 set_bit(SW_LID, input->swbit);
401 break;
402 }
403
404 error = input_register_device(input);
405 if (error)
406 goto err_remove_fs;
407 if (button->type == ACPI_BUTTON_TYPE_LID) {
408 acpi_lid_send_state(device);
409
410
411
412
413 lid_device = device;
414 }
415
416 if (device->wakeup.flags.valid) {
417
418 acpi_set_gpe_type(device->wakeup.gpe_device,
419 device->wakeup.gpe_number,
420 ACPI_GPE_TYPE_WAKE_RUN);
421 acpi_enable_gpe(device->wakeup.gpe_device,
422 device->wakeup.gpe_number);
423 device->wakeup.state.enabled = 1;
424 }
425
426 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
427 return 0;
428
429 err_remove_fs:
430 acpi_button_remove_fs(device);
431 err_free_input:
432 input_free_device(input);
433 err_free_button:
434 kfree(button);
435 return error;
436}
437
438static int acpi_button_remove(struct acpi_device *device, int type)
439{
440 struct acpi_button *button = acpi_driver_data(device);
441
442 acpi_button_remove_fs(device);
443 input_unregister_device(button->input);
444 kfree(button);
445 return 0;
446}
447
448static int __init acpi_button_init(void)
449{
450 int result;
451
452 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
453 if (!acpi_button_dir)
454 return -ENODEV;
455
456 result = acpi_bus_register_driver(&acpi_button_driver);
457 if (result < 0) {
458 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
459 return -ENODEV;
460 }
461
462 return 0;
463}
464
465static void __exit acpi_button_exit(void)
466{
467 acpi_bus_unregister_driver(&acpi_button_driver);
468
469 if (acpi_power_dir)
470 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
471 if (acpi_sleep_dir)
472 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
473 if (acpi_lid_dir)
474 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
475 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
476}
477
478module_init(acpi_button_init);
479module_exit(acpi_button_exit);
480
