summaryrefslogtreecommitdiff
path: root/drivers/acpi/button.c
blob: 8ef8f443f53970e3d9814d71ef906e00db83b047 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
/*
 *  button.c - ACPI Button Driver
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/input.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_BUTTON_CLASS		"button"
#define ACPI_BUTTON_FILE_INFO		"info"
#define ACPI_BUTTON_FILE_STATE		"state"
#define ACPI_BUTTON_TYPE_UNKNOWN	0x00
#define ACPI_BUTTON_NOTIFY_STATUS	0x80

#define ACPI_BUTTON_SUBCLASS_POWER	"power"
#define ACPI_BUTTON_HID_POWER		"PNP0C0C"
#define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button (CM)"
#define ACPI_BUTTON_DEVICE_NAME_POWERF	"Power Button (FF)"
#define ACPI_BUTTON_TYPE_POWER		0x01
#define ACPI_BUTTON_TYPE_POWERF		0x02

#define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
#define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
#define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button (CM)"
#define ACPI_BUTTON_DEVICE_NAME_SLEEPF	"Sleep Button (FF)"
#define ACPI_BUTTON_TYPE_SLEEP		0x03
#define ACPI_BUTTON_TYPE_SLEEPF		0x04

#define ACPI_BUTTON_SUBCLASS_LID	"lid"
#define ACPI_BUTTON_HID_LID		"PNP0C0D"
#define ACPI_BUTTON_DEVICE_NAME_LID	"Lid Switch"
#define ACPI_BUTTON_TYPE_LID		0x05

#define _COMPONENT		ACPI_BUTTON_COMPONENT
ACPI_MODULE_NAME("button");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Button Driver");
MODULE_LICENSE("GPL");

static const struct acpi_device_id button_device_ids[] = {
	{ACPI_BUTTON_HID_LID,    0},
	{ACPI_BUTTON_HID_SLEEP,  0},
	{ACPI_BUTTON_HID_SLEEPF, 0},
	{ACPI_BUTTON_HID_POWER,  0},
	{ACPI_BUTTON_HID_POWERF, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, button_device_ids);

static int acpi_button_add(struct acpi_device *device);
static int acpi_button_remove(struct acpi_device *device, int type);
static int acpi_button_resume(struct acpi_device *device);
static void acpi_button_notify(struct acpi_device *device, u32 event);
static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
static int acpi_button_state_open_fs(struct inode *inode, struct file *file);

static struct acpi_driver acpi_button_driver = {
	.name = "button",
	.class = ACPI_BUTTON_CLASS,
	.ids = button_device_ids,
	.ops = {
		.add = acpi_button_add,
		.resume = acpi_button_resume,
		.remove = acpi_button_remove,
		.notify = acpi_button_notify,
	},
};

struct acpi_button {
	struct acpi_device *device;	/* Fixed button kludge */
	unsigned int type;
	struct input_dev *input;
	char phys[32];			/* for input device */
	unsigned long pushed;
};

static const struct file_operations acpi_button_info_fops = {
	.owner = THIS_MODULE,
	.open = acpi_button_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static const struct file_operations acpi_button_state_fops = {
	.owner = THIS_MODULE,
	.open = acpi_button_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_button_dir;

static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_button *button = seq->private;

	seq_printf(seq, "type:                    %s\n",
		   acpi_device_name(button->device));
	return 0;
}

static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
}

static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_button *button = seq->private;
	acpi_status status;
	unsigned long long state;

	status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
	seq_printf(seq, "state:      %s\n",
		   ACPI_FAILURE(status) ? "unsupported" :
			(state ? "open" : "closed"));
	return 0;
}

static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
}

static struct proc_dir_entry *acpi_power_dir;
static struct proc_dir_entry *acpi_sleep_dir;
static struct proc_dir_entry *acpi_lid_dir;

static int acpi_button_add_fs(struct acpi_device *device)
{
	struct acpi_button *button = acpi_driver_data(device);
	struct proc_dir_entry *entry = NULL;

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
	case ACPI_BUTTON_TYPE_POWERF:
		if (!acpi_power_dir)
			acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
						    acpi_button_dir);
		entry = acpi_power_dir;
		break;
	case ACPI_BUTTON_TYPE_SLEEP:
	case ACPI_BUTTON_TYPE_SLEEPF:
		if (!acpi_sleep_dir)
			acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
						    acpi_button_dir);
		entry = acpi_sleep_dir;
		break;
	case ACPI_BUTTON_TYPE_LID:
		if (!acpi_lid_dir)
			acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
						  acpi_button_dir);
		entry = acpi_lid_dir;
		break;
	}

	if (!entry)
		return -ENODEV;

	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
	if (!acpi_device_dir(device))
		return -ENODEV;

	/* 'info' [R] */
	entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
				 S_IRUGO, acpi_device_dir(device),
				 &acpi_button_info_fops,
				 acpi_driver_data(device));
	if (!entry)
		return -ENODEV;

	/* show lid state [R] */
	if (button->type == ACPI_BUTTON_TYPE_LID) {
		entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
					 S_IRUGO, acpi_device_dir(device),
					 &acpi_button_state_fops,
					 acpi_driver_data(device));
		if (!entry)
			return -ENODEV;
	}

	return 0;
}

static int acpi_button_remove_fs(struct acpi_device *device)
{
	struct acpi_button *button = acpi_driver_data(device);

	if (acpi_device_dir(device)) {
		if (button->type == ACPI_BUTTON_TYPE_LID)
			remove_proc_entry(ACPI_BUTTON_FILE_STATE,
					  acpi_device_dir(device));
		remove_proc_entry(ACPI_BUTTON_FILE_INFO,
				  acpi_device_dir(device));

		remove_proc_entry(acpi_device_bid(device),
				  acpi_device_dir(device)->parent);
		acpi_device_dir(device) = NULL;
	}

	return 0;
}

/* --------------------------------------------------------------------------
                                Driver Interface
   -------------------------------------------------------------------------- */
static int acpi_lid_send_state(struct acpi_button *button)
{
	unsigned long long state;
	acpi_status status;

	status = acpi_evaluate_integer(button->device->handle, "_LID", NULL,
					&state);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	/* input layer checks if event is redundant */
	input_report_switch(button->input, SW_LID, !state);
	input_sync(button->input);
	return 0;
}

static void acpi_button_notify(struct acpi_device *device, u32 event)
{
	struct acpi_button *button = acpi_driver_data(device);
	struct input_dev *input;

	switch (event) {
	case ACPI_FIXED_HARDWARE_EVENT:
		event = ACPI_BUTTON_NOTIFY_STATUS;
		/* fall through */
	case ACPI_BUTTON_NOTIFY_STATUS:
		input = button->input;
		if (button->type == ACPI_BUTTON_TYPE_LID) {
			acpi_lid_send_state(button);
		} else {
			int keycode = test_bit(KEY_SLEEP, input->keybit) ?
						KEY_SLEEP : KEY_POWER;

			input_report_key(input, keycode, 1);
			input_sync(input);
			input_report_key(input, keycode, 0);
			input_sync(input);
		}

		acpi_bus_generate_proc_event(button->device, event,
					++button->pushed);
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Unsupported event [0x%x]\n", event));
		break;
	}
}

static int acpi_button_resume(struct acpi_device *device)
{
	struct acpi_button *button = acpi_driver_data(device);

	if (button->type == ACPI_BUTTON_TYPE_LID)
		return acpi_lid_send_state(button);
	return 0;
}

static int acpi_button_add(struct acpi_device *device)
{
	struct acpi_button *button;
	struct input_dev *input;
	int error;

	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
	if (!button)
		return -ENOMEM;

	button->device = device;
	device->driver_data = button;

	button->input = input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto err_free_button;
	}

	/*
	 * Determine the button type (via hid), as fixed-feature buttons
	 * need to be handled a bit differently than generic-space.
	 */
	if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
		button->type = ACPI_BUTTON_TYPE_POWER;
		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
		sprintf(acpi_device_class(device), "%s/%s",
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
		button->type = ACPI_BUTTON_TYPE_POWERF;
		strcpy(acpi_device_name(device),
		       ACPI_BUTTON_DEVICE_NAME_POWERF);
		sprintf(acpi_device_class(device), "%s/%s",
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
		button->type = ACPI_BUTTON_TYPE_SLEEP;
		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
		sprintf(acpi_device_class(device), "%s/%s",
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
		button->type = ACPI_BUTTON_TYPE_SLEEPF;
		strcpy(acpi_device_name(device),
		       ACPI_BUTTON_DEVICE_NAME_SLEEPF);
		sprintf(acpi_device_class(device), "%s/%s",
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
		button->type = ACPI_BUTTON_TYPE_LID;
		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
		sprintf(acpi_device_class(device), "%s/%s",
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
	} else {
		printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
			    acpi_device_hid(device));
		error = -ENODEV;
		goto err_free_input;
	}

	error = acpi_button_add_fs(device);
	if (error)
		goto err_free_input;

	snprintf(button->phys, sizeof(button->phys),
		 "%s/button/input0", acpi_device_hid(device));

	input->name = acpi_device_name(device);
	input->phys = button->phys;
	input->id.bustype = BUS_HOST;
	input->id.product = button->type;
	input->dev.parent = &device->dev;

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
	case ACPI_BUTTON_TYPE_POWERF:
		input->evbit[0] = BIT_MASK(EV_KEY);
		set_bit(KEY_POWER, input->keybit);
		break;

	case ACPI_BUTTON_TYPE_SLEEP:
	case ACPI_BUTTON_TYPE_SLEEPF:
		input->evbit[0] = BIT_MASK(EV_KEY);
		set_bit(KEY_SLEEP, input->keybit);
		break;

	case ACPI_BUTTON_TYPE_LID:
		input->evbit[0] = BIT_MASK(EV_SW);
		set_bit(SW_LID, input->swbit);
		break;
	}

	error = input_register_device(input);
	if (error)
		goto err_remove_fs;
	if (button->type == ACPI_BUTTON_TYPE_LID)
		acpi_lid_send_state(button);

	if (device->wakeup.flags.valid) {
		/* Button's GPE is run-wake GPE */
		acpi_set_gpe_type(device->wakeup.gpe_device,
				  device->wakeup.gpe_number,
				  ACPI_GPE_TYPE_WAKE_RUN);
		acpi_enable_gpe(device->wakeup.gpe_device,
				device->wakeup.gpe_number);
		device->wakeup.state.enabled = 1;
	}

	printk(KERN_INFO PREFIX "%s [%s]\n",
	       acpi_device_name(device), acpi_device_bid(device));
	return 0;

 err_remove_fs:
	acpi_button_remove_fs(device);
 err_free_input:
	input_free_device(input);
 err_free_button:
	kfree(button);
	return error;
}

static int acpi_button_remove(struct acpi_device *device, int type)
{
	struct acpi_button *button = acpi_driver_data(device);

	acpi_button_remove_fs(device);
	input_unregister_device(button->input);
	kfree(button);
	return 0;
}

static int __init acpi_button_init(void)
{
	int result;

	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	if (!acpi_button_dir)
		return -ENODEV;

	result = acpi_bus_register_driver(&acpi_button_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
		return -ENODEV;
	}

	return 0;
}

static void __exit acpi_button_exit(void)
{
	acpi_bus_unregister_driver(&acpi_button_driver);

	if (acpi_power_dir)
		remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
	if (acpi_sleep_dir)
		remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
	if (acpi_lid_dir)
		remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
}

module_init(acpi_button_init);
module_exit(acpi_button_exit);