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 void acpi_button_notify(struct acpi_device *device, u32 event);
81 static int acpi_button_resume(struct device *dev);
82 static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume);
84 static struct acpi_driver acpi_button_driver = {
86 .class = ACPI_BUTTON_CLASS,
87 .ids = button_device_ids,
89 .add = acpi_button_add,
90 .remove = acpi_button_remove,
91 .notify = acpi_button_notify,
93 .drv.pm = &acpi_button_pm,
98 struct input_dev *input;
99 char phys[32]; /* for input device */
100 unsigned long pushed;
104 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
105 static struct acpi_device *lid_device;
107 /* --------------------------------------------------------------------------
109 -------------------------------------------------------------------------- */
111 static struct proc_dir_entry *acpi_button_dir;
112 static struct proc_dir_entry *acpi_lid_dir;
114 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
116 struct acpi_device *device = seq->private;
118 unsigned long long state;
120 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
121 seq_printf(seq, "state: %s\n",
122 ACPI_FAILURE(status) ? "unsupported" :
123 (state ? "open" : "closed"));
127 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
129 return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
132 static const struct file_operations acpi_button_state_fops = {
133 .owner = THIS_MODULE,
134 .open = acpi_button_state_open_fs,
137 .release = single_release,
140 static int acpi_button_add_fs(struct acpi_device *device)
142 struct acpi_button *button = acpi_driver_data(device);
143 struct proc_dir_entry *entry = NULL;
146 /* procfs I/F for ACPI lid device only */
147 if (button->type != ACPI_BUTTON_TYPE_LID)
150 if (acpi_button_dir || acpi_lid_dir) {
151 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
155 /* create /proc/acpi/button */
156 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
157 if (!acpi_button_dir)
160 /* create /proc/acpi/button/lid */
161 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
164 goto remove_button_dir;
167 /* create /proc/acpi/button/lid/LID/ */
168 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
169 if (!acpi_device_dir(device)) {
174 /* create /proc/acpi/button/lid/LID/state */
175 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
176 S_IRUGO, acpi_device_dir(device),
177 &acpi_button_state_fops, device);
187 remove_proc_entry(acpi_device_bid(device),
189 acpi_device_dir(device) = NULL;
191 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
193 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
197 static int acpi_button_remove_fs(struct acpi_device *device)
199 struct acpi_button *button = acpi_driver_data(device);
201 if (button->type != ACPI_BUTTON_TYPE_LID)
204 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
205 acpi_device_dir(device));
206 remove_proc_entry(acpi_device_bid(device),
208 acpi_device_dir(device) = NULL;
209 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
210 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
215 /* --------------------------------------------------------------------------
217 -------------------------------------------------------------------------- */
218 int acpi_lid_notifier_register(struct notifier_block *nb)
220 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
222 EXPORT_SYMBOL(acpi_lid_notifier_register);
224 int acpi_lid_notifier_unregister(struct notifier_block *nb)
226 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
228 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
230 int acpi_lid_open(void)
233 unsigned long long state;
238 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
240 if (ACPI_FAILURE(status))
245 EXPORT_SYMBOL(acpi_lid_open);
247 static int acpi_lid_send_state(struct acpi_device *device)
249 struct acpi_button *button = acpi_driver_data(device);
250 unsigned long long state;
254 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
255 if (ACPI_FAILURE(status))
258 /* input layer checks if event is redundant */
259 input_report_switch(button->input, SW_LID, !state);
260 input_sync(button->input);
263 pm_wakeup_event(&device->dev, 0);
265 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
266 if (ret == NOTIFY_DONE)
267 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
269 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
271 * It is also regarded as success if the notifier_chain
272 * returns NOTIFY_OK or NOTIFY_DONE.
279 static void acpi_button_notify(struct acpi_device *device, u32 event)
281 struct acpi_button *button = acpi_driver_data(device);
282 struct input_dev *input;
285 case ACPI_FIXED_HARDWARE_EVENT:
286 event = ACPI_BUTTON_NOTIFY_STATUS;
288 case ACPI_BUTTON_NOTIFY_STATUS:
289 input = button->input;
290 if (button->type == ACPI_BUTTON_TYPE_LID) {
291 acpi_lid_send_state(device);
293 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
294 KEY_SLEEP : KEY_POWER;
296 input_report_key(input, keycode, 1);
298 input_report_key(input, keycode, 0);
301 pm_wakeup_event(&device->dev, 0);
304 acpi_bus_generate_proc_event(device, event, ++button->pushed);
307 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
308 "Unsupported event [0x%x]\n", event));
313 static int acpi_button_resume(struct device *dev)
315 struct acpi_device *device = to_acpi_device(dev);
316 struct acpi_button *button = acpi_driver_data(device);
318 if (button->type == ACPI_BUTTON_TYPE_LID)
319 return acpi_lid_send_state(device);
323 static int acpi_button_add(struct acpi_device *device)
325 struct acpi_button *button;
326 struct input_dev *input;
327 const char *hid = acpi_device_hid(device);
331 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
335 device->driver_data = button;
337 button->input = input = input_allocate_device();
340 goto err_free_button;
343 name = acpi_device_name(device);
344 class = acpi_device_class(device);
346 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
347 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
348 button->type = ACPI_BUTTON_TYPE_POWER;
349 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
350 sprintf(class, "%s/%s",
351 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
352 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
353 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
354 button->type = ACPI_BUTTON_TYPE_SLEEP;
355 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
356 sprintf(class, "%s/%s",
357 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
358 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
359 button->type = ACPI_BUTTON_TYPE_LID;
360 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
361 sprintf(class, "%s/%s",
362 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
364 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
369 error = acpi_button_add_fs(device);
373 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
376 input->phys = button->phys;
377 input->id.bustype = BUS_HOST;
378 input->id.product = button->type;
379 input->dev.parent = &device->dev;
381 switch (button->type) {
382 case ACPI_BUTTON_TYPE_POWER:
383 input->evbit[0] = BIT_MASK(EV_KEY);
384 set_bit(KEY_POWER, input->keybit);
387 case ACPI_BUTTON_TYPE_SLEEP:
388 input->evbit[0] = BIT_MASK(EV_KEY);
389 set_bit(KEY_SLEEP, input->keybit);
392 case ACPI_BUTTON_TYPE_LID:
393 input->evbit[0] = BIT_MASK(EV_SW);
394 set_bit(SW_LID, input->swbit);
398 error = input_register_device(input);
401 if (button->type == ACPI_BUTTON_TYPE_LID) {
402 acpi_lid_send_state(device);
404 * This assumes there's only one lid device, or if there are
405 * more we only care about the last one...
410 if (device->wakeup.flags.valid) {
411 /* Button's GPE is run-wake GPE */
412 acpi_enable_gpe(device->wakeup.gpe_device,
413 device->wakeup.gpe_number);
414 if (!device_may_wakeup(&device->dev)) {
415 device_set_wakeup_enable(&device->dev, true);
416 button->wakeup_enabled = true;
420 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
424 acpi_button_remove_fs(device);
426 input_free_device(input);
432 static int acpi_button_remove(struct acpi_device *device, int type)
434 struct acpi_button *button = acpi_driver_data(device);
436 if (device->wakeup.flags.valid) {
437 acpi_disable_gpe(device->wakeup.gpe_device,
438 device->wakeup.gpe_number);
439 if (button->wakeup_enabled)
440 device_set_wakeup_enable(&device->dev, false);
443 acpi_button_remove_fs(device);
444 input_unregister_device(button->input);
449 static int __init acpi_button_init(void)
451 return acpi_bus_register_driver(&acpi_button_driver);
454 static void __exit acpi_button_exit(void)
456 acpi_bus_unregister_driver(&acpi_button_driver);
459 module_init(acpi_button_init);
460 module_exit(acpi_button_exit);