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