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 <linux/slab.h>
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
37 #define PREFIX "ACPI: "
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
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
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
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
60 #define _COMPONENT ACPI_BUTTON_COMPONENT
61 ACPI_MODULE_NAME("button");
63 MODULE_AUTHOR("Paul Diefenbaugh");
64 MODULE_DESCRIPTION("ACPI Button Driver");
65 MODULE_LICENSE("GPL");
67 static 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},
75 MODULE_DEVICE_TABLE(acpi, button_device_ids);
77 static int acpi_button_add(struct acpi_device *device);
78 static int acpi_button_remove(struct acpi_device *device, int type);
79 static int acpi_button_resume(struct acpi_device *device);
80 static void acpi_button_notify(struct acpi_device *device, u32 event);
81 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
82 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
84 static struct acpi_driver acpi_button_driver = {
86 .class = ACPI_BUTTON_CLASS,
87 .ids = button_device_ids,
89 .add = acpi_button_add,
90 .resume = acpi_button_resume,
91 .remove = acpi_button_remove,
92 .notify = acpi_button_notify,
98 struct input_dev *input;
99 char phys[32]; /* for input device */
100 unsigned long pushed;
104 static const struct file_operations acpi_button_info_fops = {
105 .owner = THIS_MODULE,
106 .open = acpi_button_info_open_fs,
109 .release = single_release,
112 static const struct file_operations acpi_button_state_fops = {
113 .owner = THIS_MODULE,
114 .open = acpi_button_state_open_fs,
117 .release = single_release,
120 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
121 static struct acpi_device *lid_device;
123 /* --------------------------------------------------------------------------
125 -------------------------------------------------------------------------- */
127 static struct proc_dir_entry *acpi_button_dir;
129 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
131 struct acpi_device *device = seq->private;
133 seq_printf(seq, "type: %s\n",
134 acpi_device_name(device));
138 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
140 return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
143 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
145 struct acpi_device *device = seq->private;
147 unsigned long long state;
149 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
150 seq_printf(seq, "state: %s\n",
151 ACPI_FAILURE(status) ? "unsupported" :
152 (state ? "open" : "closed"));
156 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
158 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
161 static struct proc_dir_entry *acpi_power_dir;
162 static struct proc_dir_entry *acpi_sleep_dir;
163 static struct proc_dir_entry *acpi_lid_dir;
165 static int acpi_button_add_fs(struct acpi_device *device)
167 struct acpi_button *button = acpi_driver_data(device);
168 struct proc_dir_entry *entry = NULL;
170 switch (button->type) {
171 case ACPI_BUTTON_TYPE_POWER:
173 acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
175 entry = acpi_power_dir;
177 case ACPI_BUTTON_TYPE_SLEEP:
179 acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
181 entry = acpi_sleep_dir;
183 case ACPI_BUTTON_TYPE_LID:
185 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
187 entry = acpi_lid_dir;
194 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
195 if (!acpi_device_dir(device))
199 entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
200 S_IRUGO, acpi_device_dir(device),
201 &acpi_button_info_fops, device);
205 /* show lid state [R] */
206 if (button->type == ACPI_BUTTON_TYPE_LID) {
207 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
208 S_IRUGO, acpi_device_dir(device),
209 &acpi_button_state_fops, device);
217 static int acpi_button_remove_fs(struct acpi_device *device)
219 struct acpi_button *button = acpi_driver_data(device);
221 if (acpi_device_dir(device)) {
222 if (button->type == ACPI_BUTTON_TYPE_LID)
223 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
224 acpi_device_dir(device));
225 remove_proc_entry(ACPI_BUTTON_FILE_INFO,
226 acpi_device_dir(device));
228 remove_proc_entry(acpi_device_bid(device),
229 acpi_device_dir(device)->parent);
230 acpi_device_dir(device) = NULL;
236 /* --------------------------------------------------------------------------
238 -------------------------------------------------------------------------- */
239 int acpi_lid_notifier_register(struct notifier_block *nb)
241 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
243 EXPORT_SYMBOL(acpi_lid_notifier_register);
245 int acpi_lid_notifier_unregister(struct notifier_block *nb)
247 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
249 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
251 int acpi_lid_open(void)
254 unsigned long long state;
259 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
261 if (ACPI_FAILURE(status))
266 EXPORT_SYMBOL(acpi_lid_open);
268 static int acpi_lid_send_state(struct acpi_device *device)
270 struct acpi_button *button = acpi_driver_data(device);
271 unsigned long long state;
275 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
276 if (ACPI_FAILURE(status))
279 /* input layer checks if event is redundant */
280 input_report_switch(button->input, SW_LID, !state);
281 input_sync(button->input);
284 pm_wakeup_event(&device->dev, 0);
286 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
287 if (ret == NOTIFY_DONE)
288 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
290 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
292 * It is also regarded as success if the notifier_chain
293 * returns NOTIFY_OK or NOTIFY_DONE.
300 static void acpi_button_notify(struct acpi_device *device, u32 event)
302 struct acpi_button *button = acpi_driver_data(device);
303 struct input_dev *input;
306 case ACPI_FIXED_HARDWARE_EVENT:
307 event = ACPI_BUTTON_NOTIFY_STATUS;
309 case ACPI_BUTTON_NOTIFY_STATUS:
310 input = button->input;
311 if (button->type == ACPI_BUTTON_TYPE_LID) {
312 acpi_lid_send_state(device);
314 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
315 KEY_SLEEP : KEY_POWER;
317 input_report_key(input, keycode, 1);
319 input_report_key(input, keycode, 0);
322 pm_wakeup_event(&device->dev, 0);
325 acpi_bus_generate_proc_event(device, event, ++button->pushed);
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
329 "Unsupported event [0x%x]\n", event));
334 static int acpi_button_resume(struct acpi_device *device)
336 struct acpi_button *button = acpi_driver_data(device);
338 if (button->type == ACPI_BUTTON_TYPE_LID)
339 return acpi_lid_send_state(device);
343 static int acpi_button_add(struct acpi_device *device)
345 struct acpi_button *button;
346 struct input_dev *input;
347 const char *hid = acpi_device_hid(device);
351 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
355 device->driver_data = button;
357 button->input = input = input_allocate_device();
360 goto err_free_button;
363 name = acpi_device_name(device);
364 class = acpi_device_class(device);
366 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
367 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
368 button->type = ACPI_BUTTON_TYPE_POWER;
369 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
370 sprintf(class, "%s/%s",
371 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
372 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
373 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
374 button->type = ACPI_BUTTON_TYPE_SLEEP;
375 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
376 sprintf(class, "%s/%s",
377 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
378 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
379 button->type = ACPI_BUTTON_TYPE_LID;
380 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
381 sprintf(class, "%s/%s",
382 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
384 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
389 error = acpi_button_add_fs(device);
393 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
396 input->phys = button->phys;
397 input->id.bustype = BUS_HOST;
398 input->id.product = button->type;
399 input->dev.parent = &device->dev;
401 switch (button->type) {
402 case ACPI_BUTTON_TYPE_POWER:
403 input->evbit[0] = BIT_MASK(EV_KEY);
404 set_bit(KEY_POWER, input->keybit);
407 case ACPI_BUTTON_TYPE_SLEEP:
408 input->evbit[0] = BIT_MASK(EV_KEY);
409 set_bit(KEY_SLEEP, input->keybit);
412 case ACPI_BUTTON_TYPE_LID:
413 input->evbit[0] = BIT_MASK(EV_SW);
414 set_bit(SW_LID, input->swbit);
418 error = input_register_device(input);
421 if (button->type == ACPI_BUTTON_TYPE_LID) {
422 acpi_lid_send_state(device);
424 * This assumes there's only one lid device, or if there are
425 * more we only care about the last one...
430 if (device->wakeup.flags.valid) {
431 /* Button's GPE is run-wake GPE */
432 acpi_enable_gpe(device->wakeup.gpe_device,
433 device->wakeup.gpe_number);
434 if (!device_may_wakeup(&device->dev)) {
435 device_set_wakeup_enable(&device->dev, true);
436 button->wakeup_enabled = true;
440 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
444 acpi_button_remove_fs(device);
446 input_free_device(input);
452 static int acpi_button_remove(struct acpi_device *device, int type)
454 struct acpi_button *button = acpi_driver_data(device);
456 if (device->wakeup.flags.valid) {
457 acpi_disable_gpe(device->wakeup.gpe_device,
458 device->wakeup.gpe_number);
459 if (button->wakeup_enabled)
460 device_set_wakeup_enable(&device->dev, false);
463 acpi_button_remove_fs(device);
464 input_unregister_device(button->input);
469 static int __init acpi_button_init(void)
473 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
474 if (!acpi_button_dir)
477 result = acpi_bus_register_driver(&acpi_button_driver);
479 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
486 static void __exit acpi_button_exit(void)
488 acpi_bus_unregister_driver(&acpi_button_driver);
491 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
493 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
495 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
496 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
499 module_init(acpi_button_init);
500 module_exit(acpi_button_exit);