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 <linux/acpi.h>
35 #include <acpi/button.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);
79 static void acpi_button_notify(struct acpi_device *device, u32 event);
81 #ifdef CONFIG_PM_SLEEP
82 static int acpi_button_resume(struct device *dev);
84 static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume);
86 static struct acpi_driver acpi_button_driver = {
88 .class = ACPI_BUTTON_CLASS,
89 .ids = button_device_ids,
91 .add = acpi_button_add,
92 .remove = acpi_button_remove,
93 .notify = acpi_button_notify,
95 .drv.pm = &acpi_button_pm,
100 struct input_dev *input;
101 char phys[32]; /* for input device */
102 unsigned long pushed;
105 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
106 static struct acpi_device *lid_device;
108 /* --------------------------------------------------------------------------
110 -------------------------------------------------------------------------- */
112 static struct proc_dir_entry *acpi_button_dir;
113 static struct proc_dir_entry *acpi_lid_dir;
115 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
117 struct acpi_device *device = seq->private;
119 unsigned long long state;
121 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
122 seq_printf(seq, "state: %s\n",
123 ACPI_FAILURE(status) ? "unsupported" :
124 (state ? "open" : "closed"));
128 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
130 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
133 static const struct file_operations acpi_button_state_fops = {
134 .owner = THIS_MODULE,
135 .open = acpi_button_state_open_fs,
138 .release = single_release,
141 static int acpi_button_add_fs(struct acpi_device *device)
143 struct acpi_button *button = acpi_driver_data(device);
144 struct proc_dir_entry *entry = NULL;
147 /* procfs I/F for ACPI lid device only */
148 if (button->type != ACPI_BUTTON_TYPE_LID)
151 if (acpi_button_dir || acpi_lid_dir) {
152 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
156 /* create /proc/acpi/button */
157 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
158 if (!acpi_button_dir)
161 /* create /proc/acpi/button/lid */
162 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
165 goto remove_button_dir;
168 /* create /proc/acpi/button/lid/LID/ */
169 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
170 if (!acpi_device_dir(device)) {
175 /* create /proc/acpi/button/lid/LID/state */
176 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
177 S_IRUGO, acpi_device_dir(device),
178 &acpi_button_state_fops, device);
188 remove_proc_entry(acpi_device_bid(device),
190 acpi_device_dir(device) = NULL;
192 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
194 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
198 static int acpi_button_remove_fs(struct acpi_device *device)
200 struct acpi_button *button = acpi_driver_data(device);
202 if (button->type != ACPI_BUTTON_TYPE_LID)
205 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
206 acpi_device_dir(device));
207 remove_proc_entry(acpi_device_bid(device),
209 acpi_device_dir(device) = NULL;
210 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
211 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
216 /* --------------------------------------------------------------------------
218 -------------------------------------------------------------------------- */
219 int acpi_lid_notifier_register(struct notifier_block *nb)
221 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
223 EXPORT_SYMBOL(acpi_lid_notifier_register);
225 int acpi_lid_notifier_unregister(struct notifier_block *nb)
227 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
229 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
231 int acpi_lid_open(void)
234 unsigned long long state;
239 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
241 if (ACPI_FAILURE(status))
246 EXPORT_SYMBOL(acpi_lid_open);
248 static int acpi_lid_send_state(struct acpi_device *device)
250 struct acpi_button *button = acpi_driver_data(device);
251 unsigned long long state;
255 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
256 if (ACPI_FAILURE(status))
259 /* input layer checks if event is redundant */
260 input_report_switch(button->input, SW_LID, !state);
261 input_sync(button->input);
264 pm_wakeup_event(&device->dev, 0);
266 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
267 if (ret == NOTIFY_DONE)
268 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
270 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
272 * It is also regarded as success if the notifier_chain
273 * returns NOTIFY_OK or NOTIFY_DONE.
280 static void acpi_button_notify(struct acpi_device *device, u32 event)
282 struct acpi_button *button = acpi_driver_data(device);
283 struct input_dev *input;
286 case ACPI_FIXED_HARDWARE_EVENT:
287 event = ACPI_BUTTON_NOTIFY_STATUS;
289 case ACPI_BUTTON_NOTIFY_STATUS:
290 input = button->input;
291 if (button->type == ACPI_BUTTON_TYPE_LID) {
292 acpi_lid_send_state(device);
294 int keycode = test_bit(KEY_SLEEP, input->keybit) ?
295 KEY_SLEEP : KEY_POWER;
297 input_report_key(input, keycode, 1);
299 input_report_key(input, keycode, 0);
302 pm_wakeup_event(&device->dev, 0);
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307 "Unsupported event [0x%x]\n", event));
312 #ifdef CONFIG_PM_SLEEP
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);
324 static int acpi_button_add(struct acpi_device *device)
326 struct acpi_button *button;
327 struct input_dev *input;
328 const char *hid = acpi_device_hid(device);
332 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
336 device->driver_data = button;
338 button->input = input = input_allocate_device();
341 goto err_free_button;
344 name = acpi_device_name(device);
345 class = acpi_device_class(device);
347 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
348 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
349 button->type = ACPI_BUTTON_TYPE_POWER;
350 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
351 sprintf(class, "%s/%s",
352 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
353 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
354 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
355 button->type = ACPI_BUTTON_TYPE_SLEEP;
356 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
357 sprintf(class, "%s/%s",
358 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
359 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
360 button->type = ACPI_BUTTON_TYPE_LID;
361 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
362 sprintf(class, "%s/%s",
363 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
365 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
370 error = acpi_button_add_fs(device);
374 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
377 input->phys = button->phys;
378 input->id.bustype = BUS_HOST;
379 input->id.product = button->type;
380 input->dev.parent = &device->dev;
382 switch (button->type) {
383 case ACPI_BUTTON_TYPE_POWER:
384 input_set_capability(input, EV_KEY, KEY_POWER);
387 case ACPI_BUTTON_TYPE_SLEEP:
388 input_set_capability(input, EV_KEY, KEY_SLEEP);
391 case ACPI_BUTTON_TYPE_LID:
392 input_set_capability(input, EV_SW, SW_LID);
396 error = input_register_device(input);
399 if (button->type == ACPI_BUTTON_TYPE_LID) {
400 acpi_lid_send_state(device);
402 * This assumes there's only one lid device, or if there are
403 * more we only care about the last one...
408 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
412 acpi_button_remove_fs(device);
414 input_free_device(input);
420 static int acpi_button_remove(struct acpi_device *device)
422 struct acpi_button *button = acpi_driver_data(device);
424 acpi_button_remove_fs(device);
425 input_unregister_device(button->input);
430 module_acpi_driver(acpi_button_driver);