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},
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 = {
85 .class = ACPI_BUTTON_CLASS,
86 .ids = button_device_ids,
88 .add = acpi_button_add,
89 .resume = acpi_button_resume,
90 .remove = acpi_button_remove,
91 .notify = acpi_button_notify,
97 struct input_dev *input;
98 char phys[32]; /* for input device */
102 static const struct file_operations acpi_button_info_fops = {
103 .owner = THIS_MODULE,
104 .open = acpi_button_info_open_fs,
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,
115 .release = single_release,
118 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
119 static struct acpi_device *lid_device;
121 /* --------------------------------------------------------------------------
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));
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;
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"));
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:
171 acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
173 entry = acpi_power_dir;
175 case ACPI_BUTTON_TYPE_SLEEP:
177 acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
179 entry = acpi_sleep_dir;
181 case ACPI_BUTTON_TYPE_LID:
183 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
185 entry = acpi_lid_dir;
192 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
193 if (!acpi_device_dir(device))
197 entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
198 S_IRUGO, acpi_device_dir(device),
199 &acpi_button_info_fops, device);
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);
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;
234 /* --------------------------------------------------------------------------
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)
252 unsigned long long state;
254 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
256 if (ACPI_FAILURE(status))
261 EXPORT_SYMBOL(acpi_lid_open);
263 static int acpi_lid_send_state(struct acpi_device *device)
265 struct acpi_button *button = acpi_driver_data(device);
266 unsigned long long state;
270 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
271 if (ACPI_FAILURE(status))
274 /* input layer checks if event is redundant */
275 input_report_switch(button->input, SW_LID, !state);
276 input_sync(button->input);
278 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
279 if (ret == NOTIFY_DONE)
280 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
285 static void acpi_button_notify(struct acpi_device *device, u32 event)
287 struct acpi_button *button = acpi_driver_data(device);
288 struct input_dev *input;
291 case ACPI_FIXED_HARDWARE_EVENT:
292 event = ACPI_BUTTON_NOTIFY_STATUS;
294 case ACPI_BUTTON_NOTIFY_STATUS:
295 input = button->input;
296 if (button->type == ACPI_BUTTON_TYPE_LID) {
297 acpi_lid_send_state(device);
299 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
300 KEY_SLEEP : KEY_POWER;
302 input_report_key(input, keycode, 1);
304 input_report_key(input, keycode, 0);
308 acpi_bus_generate_proc_event(device, event, ++button->pushed);
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
312 "Unsupported event [0x%x]\n", event));
317 static int acpi_button_resume(struct acpi_device *device)
319 struct acpi_button *button = acpi_driver_data(device);
321 if (button->type == ACPI_BUTTON_TYPE_LID)
322 return acpi_lid_send_state(device);
326 static int acpi_button_add(struct acpi_device *device)
328 struct acpi_button *button;
329 struct input_dev *input;
330 char *hid, *name, *class;
333 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
337 device->driver_data = button;
339 button->input = input = input_allocate_device();
342 goto err_free_button;
345 hid = acpi_device_hid(device);
346 name = acpi_device_name(device);
347 class = acpi_device_class(device);
349 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
350 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
351 button->type = ACPI_BUTTON_TYPE_POWER;
352 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
353 sprintf(class, "%s/%s",
354 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
355 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
356 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
357 button->type = ACPI_BUTTON_TYPE_SLEEP;
358 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
359 sprintf(class, "%s/%s",
360 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
361 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
362 button->type = ACPI_BUTTON_TYPE_LID;
363 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
364 sprintf(class, "%s/%s",
365 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
367 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
372 error = acpi_button_add_fs(device);
376 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
379 input->phys = button->phys;
380 input->id.bustype = BUS_HOST;
381 input->id.product = button->type;
382 input->dev.parent = &device->dev;
384 switch (button->type) {
385 case ACPI_BUTTON_TYPE_POWER:
386 input->evbit[0] = BIT_MASK(EV_KEY);
387 set_bit(KEY_POWER, input->keybit);
390 case ACPI_BUTTON_TYPE_SLEEP:
391 input->evbit[0] = BIT_MASK(EV_KEY);
392 set_bit(KEY_SLEEP, input->keybit);
395 case ACPI_BUTTON_TYPE_LID:
396 input->evbit[0] = BIT_MASK(EV_SW);
397 set_bit(SW_LID, input->swbit);
401 error = input_register_device(input);
404 if (button->type == ACPI_BUTTON_TYPE_LID) {
405 acpi_lid_send_state(device);
407 * This assumes there's only one lid device, or if there are
408 * more we only care about the last one...
413 if (device->wakeup.flags.valid) {
414 /* Button's GPE is run-wake GPE */
415 acpi_set_gpe_type(device->wakeup.gpe_device,
416 device->wakeup.gpe_number,
417 ACPI_GPE_TYPE_WAKE_RUN);
418 acpi_enable_gpe(device->wakeup.gpe_device,
419 device->wakeup.gpe_number);
420 device->wakeup.state.enabled = 1;
423 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
427 acpi_button_remove_fs(device);
429 input_free_device(input);
435 static int acpi_button_remove(struct acpi_device *device, int type)
437 struct acpi_button *button = acpi_driver_data(device);
439 acpi_button_remove_fs(device);
440 input_unregister_device(button->input);
445 static int __init acpi_button_init(void)
449 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
450 if (!acpi_button_dir)
453 result = acpi_bus_register_driver(&acpi_button_driver);
455 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
462 static void __exit acpi_button_exit(void)
464 acpi_bus_unregister_driver(&acpi_button_driver);
467 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
469 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
471 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
472 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
475 module_init(acpi_button_init);
476 module_exit(acpi_button_exit);