Linux 2.6.34-rc3
[pohmelfs.git] / drivers / acpi / button.c
blobf53fbe307c9dba027d9e4dc53867f0579da2f783
1 /*
2 * button.c - ACPI Button Driver
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
36 #define PREFIX "ACPI: "
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
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
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
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
59 #define _COMPONENT ACPI_BUTTON_COMPONENT
60 ACPI_MODULE_NAME("button");
62 MODULE_AUTHOR("Paul Diefenbaugh");
63 MODULE_DESCRIPTION("ACPI Button Driver");
64 MODULE_LICENSE("GPL");
66 static 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},
74 MODULE_DEVICE_TABLE(acpi, button_device_ids);
76 static int acpi_button_add(struct acpi_device *device);
77 static int acpi_button_remove(struct acpi_device *device, int type);
78 static int acpi_button_resume(struct acpi_device *device);
79 static void acpi_button_notify(struct acpi_device *device, u32 event);
80 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
81 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
83 static 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,
95 struct acpi_button {
96 unsigned int type;
97 struct input_dev *input;
98 char phys[32]; /* for input device */
99 unsigned long pushed;
102 static 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,
110 static 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,
118 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
119 static struct acpi_device *lid_device;
121 /* --------------------------------------------------------------------------
122 FS Interface (/proc)
123 -------------------------------------------------------------------------- */
125 static struct proc_dir_entry *acpi_button_dir;
127 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
129 struct acpi_device *device = seq->private;
131 seq_printf(seq, "type: %s\n",
132 acpi_device_name(device));
133 return 0;
136 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
138 return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
141 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
143 struct acpi_device *device = seq->private;
144 acpi_status status;
145 unsigned long long state;
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;
154 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
156 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
159 static struct proc_dir_entry *acpi_power_dir;
160 static struct proc_dir_entry *acpi_sleep_dir;
161 static struct proc_dir_entry *acpi_lid_dir;
163 static int acpi_button_add_fs(struct acpi_device *device)
165 struct acpi_button *button = acpi_driver_data(device);
166 struct proc_dir_entry *entry = NULL;
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;
189 if (!entry)
190 return -ENODEV;
192 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
193 if (!acpi_device_dir(device))
194 return -ENODEV;
196 /* 'info' [R] */
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;
203 /* show lid state [R] */
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;
212 return 0;
215 static int acpi_button_remove_fs(struct acpi_device *device)
217 struct acpi_button *button = acpi_driver_data(device);
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));
226 remove_proc_entry(acpi_device_bid(device),
227 acpi_device_dir(device)->parent);
228 acpi_device_dir(device) = NULL;
231 return 0;
234 /* --------------------------------------------------------------------------
235 Driver Interface
236 -------------------------------------------------------------------------- */
237 int acpi_lid_notifier_register(struct notifier_block *nb)
239 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
241 EXPORT_SYMBOL(acpi_lid_notifier_register);
243 int acpi_lid_notifier_unregister(struct notifier_block *nb)
245 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
247 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
249 int acpi_lid_open(void)
251 acpi_status status;
252 unsigned long long state;
254 if (!lid_device)
255 return -ENODEV;
257 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
258 &state);
259 if (ACPI_FAILURE(status))
260 return -ENODEV;
262 return !!state;
264 EXPORT_SYMBOL(acpi_lid_open);
266 static int acpi_lid_send_state(struct acpi_device *device)
268 struct acpi_button *button = acpi_driver_data(device);
269 unsigned long long state;
270 acpi_status status;
271 int ret;
273 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
274 if (ACPI_FAILURE(status))
275 return -ENODEV;
277 /* input layer checks if event is redundant */
278 input_report_switch(button->input, SW_LID, !state);
279 input_sync(button->input);
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 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
287 * It is also regarded as success if the notifier_chain
288 * returns NOTIFY_OK or NOTIFY_DONE.
290 ret = 0;
292 return ret;
295 static void acpi_button_notify(struct acpi_device *device, u32 event)
297 struct acpi_button *button = acpi_driver_data(device);
298 struct input_dev *input;
300 switch (event) {
301 case ACPI_FIXED_HARDWARE_EVENT:
302 event = ACPI_BUTTON_NOTIFY_STATUS;
303 /* fall through */
304 case ACPI_BUTTON_NOTIFY_STATUS:
305 input = button->input;
306 if (button->type == ACPI_BUTTON_TYPE_LID) {
307 acpi_lid_send_state(device);
308 } else {
309 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
310 KEY_SLEEP : KEY_POWER;
312 input_report_key(input, keycode, 1);
313 input_sync(input);
314 input_report_key(input, keycode, 0);
315 input_sync(input);
318 acpi_bus_generate_proc_event(device, event, ++button->pushed);
319 break;
320 default:
321 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
322 "Unsupported event [0x%x]\n", event));
323 break;
327 static int acpi_button_resume(struct acpi_device *device)
329 struct acpi_button *button = acpi_driver_data(device);
331 if (button->type == ACPI_BUTTON_TYPE_LID)
332 return acpi_lid_send_state(device);
333 return 0;
336 static int acpi_button_add(struct acpi_device *device)
338 struct acpi_button *button;
339 struct input_dev *input;
340 char *hid, *name, *class;
341 int error;
343 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
344 if (!button)
345 return -ENOMEM;
347 device->driver_data = button;
349 button->input = input = input_allocate_device();
350 if (!input) {
351 error = -ENOMEM;
352 goto err_free_button;
355 hid = acpi_device_hid(device);
356 name = acpi_device_name(device);
357 class = acpi_device_class(device);
359 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
360 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
361 button->type = ACPI_BUTTON_TYPE_POWER;
362 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
363 sprintf(class, "%s/%s",
364 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
365 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
366 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
367 button->type = ACPI_BUTTON_TYPE_SLEEP;
368 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
369 sprintf(class, "%s/%s",
370 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
371 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
372 button->type = ACPI_BUTTON_TYPE_LID;
373 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
374 sprintf(class, "%s/%s",
375 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
376 } else {
377 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
378 error = -ENODEV;
379 goto err_free_input;
382 error = acpi_button_add_fs(device);
383 if (error)
384 goto err_free_input;
386 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
388 input->name = name;
389 input->phys = button->phys;
390 input->id.bustype = BUS_HOST;
391 input->id.product = button->type;
392 input->dev.parent = &device->dev;
394 switch (button->type) {
395 case ACPI_BUTTON_TYPE_POWER:
396 input->evbit[0] = BIT_MASK(EV_KEY);
397 set_bit(KEY_POWER, input->keybit);
398 break;
400 case ACPI_BUTTON_TYPE_SLEEP:
401 input->evbit[0] = BIT_MASK(EV_KEY);
402 set_bit(KEY_SLEEP, input->keybit);
403 break;
405 case ACPI_BUTTON_TYPE_LID:
406 input->evbit[0] = BIT_MASK(EV_SW);
407 set_bit(SW_LID, input->swbit);
408 break;
411 error = input_register_device(input);
412 if (error)
413 goto err_remove_fs;
414 if (button->type == ACPI_BUTTON_TYPE_LID) {
415 acpi_lid_send_state(device);
417 * This assumes there's only one lid device, or if there are
418 * more we only care about the last one...
420 lid_device = device;
423 if (device->wakeup.flags.valid) {
424 /* Button's GPE is run-wake GPE */
425 acpi_enable_gpe(device->wakeup.gpe_device,
426 device->wakeup.gpe_number,
427 ACPI_GPE_TYPE_WAKE_RUN);
428 device->wakeup.run_wake_count++;
429 device->wakeup.state.enabled = 1;
432 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
433 return 0;
435 err_remove_fs:
436 acpi_button_remove_fs(device);
437 err_free_input:
438 input_free_device(input);
439 err_free_button:
440 kfree(button);
441 return error;
444 static int acpi_button_remove(struct acpi_device *device, int type)
446 struct acpi_button *button = acpi_driver_data(device);
448 if (device->wakeup.flags.valid) {
449 acpi_disable_gpe(device->wakeup.gpe_device,
450 device->wakeup.gpe_number,
451 ACPI_GPE_TYPE_WAKE_RUN);
452 device->wakeup.run_wake_count--;
453 device->wakeup.state.enabled = 0;
456 acpi_button_remove_fs(device);
457 input_unregister_device(button->input);
458 kfree(button);
459 return 0;
462 static int __init acpi_button_init(void)
464 int result;
466 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
467 if (!acpi_button_dir)
468 return -ENODEV;
470 result = acpi_bus_register_driver(&acpi_button_driver);
471 if (result < 0) {
472 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
473 return -ENODEV;
476 return 0;
479 static void __exit acpi_button_exit(void)
481 acpi_bus_unregister_driver(&acpi_button_driver);
483 if (acpi_power_dir)
484 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
485 if (acpi_sleep_dir)
486 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
487 if (acpi_lid_dir)
488 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
489 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
492 module_init(acpi_button_init);
493 module_exit(acpi_button_exit);