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
;
257 status
= acpi_evaluate_integer(lid_device
->handle
, "_LID", NULL
,
259 if (ACPI_FAILURE(status
))
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
;
273 status
= acpi_evaluate_integer(device
->handle
, "_LID", NULL
, &state
);
274 if (ACPI_FAILURE(status
))
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
,
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.
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
;
301 case ACPI_FIXED_HARDWARE_EVENT
:
302 event
= ACPI_BUTTON_NOTIFY_STATUS
;
304 case ACPI_BUTTON_NOTIFY_STATUS
:
305 input
= button
->input
;
306 if (button
->type
== ACPI_BUTTON_TYPE_LID
) {
307 acpi_lid_send_state(device
);
309 int keycode
= test_bit(KEY_SLEEP
, input
->keybit
) ?
310 KEY_SLEEP
: KEY_POWER
;
312 input_report_key(input
, keycode
, 1);
314 input_report_key(input
, keycode
, 0);
318 acpi_bus_generate_proc_event(device
, event
, ++button
->pushed
);
321 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
322 "Unsupported event [0x%x]\n", event
));
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
);
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;
343 button
= kzalloc(sizeof(struct acpi_button
), GFP_KERNEL
);
347 device
->driver_data
= button
;
349 button
->input
= input
= input_allocate_device();
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
);
377 printk(KERN_ERR PREFIX
"Unsupported hid [%s]\n", hid
);
382 error
= acpi_button_add_fs(device
);
386 snprintf(button
->phys
, sizeof(button
->phys
), "%s/button/input0", hid
);
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
);
400 case ACPI_BUTTON_TYPE_SLEEP
:
401 input
->evbit
[0] = BIT_MASK(EV_KEY
);
402 set_bit(KEY_SLEEP
, input
->keybit
);
405 case ACPI_BUTTON_TYPE_LID
:
406 input
->evbit
[0] = BIT_MASK(EV_SW
);
407 set_bit(SW_LID
, input
->swbit
);
411 error
= input_register_device(input
);
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...
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
));
436 acpi_button_remove_fs(device
);
438 input_free_device(input
);
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
);
462 static int __init
acpi_button_init(void)
466 acpi_button_dir
= proc_mkdir(ACPI_BUTTON_CLASS
, acpi_root_dir
);
467 if (!acpi_button_dir
)
470 result
= acpi_bus_register_driver(&acpi_button_driver
);
472 remove_proc_entry(ACPI_BUTTON_CLASS
, acpi_root_dir
);
479 static void __exit
acpi_button_exit(void)
481 acpi_bus_unregister_driver(&acpi_button_driver
);
484 remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER
, acpi_button_dir
);
486 remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP
, acpi_button_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
);