button.c 13.2 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
B
Bjorn Helgaas 已提交
2
 *  button.c - ACPI Button Driver
L
Linus Torvalds 已提交
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
 *
 *  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>
29 30 31
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
32
#include <linux/input.h>
33
#include <linux/slab.h>
L
Linus Torvalds 已提交
34 35 36
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

37 38
#define PREFIX "ACPI: "

L
Linus Torvalds 已提交
39
#define ACPI_BUTTON_CLASS		"button"
40 41 42
#define ACPI_BUTTON_FILE_INFO		"info"
#define ACPI_BUTTON_FILE_STATE		"state"
#define ACPI_BUTTON_TYPE_UNKNOWN	0x00
L
Linus Torvalds 已提交
43 44 45
#define ACPI_BUTTON_NOTIFY_STATUS	0x80

#define ACPI_BUTTON_SUBCLASS_POWER	"power"
L
Len Brown 已提交
46
#define ACPI_BUTTON_HID_POWER		"PNP0C0C"
47
#define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button"
L
Linus Torvalds 已提交
48 49 50 51
#define ACPI_BUTTON_TYPE_POWER		0x01

#define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
#define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
52
#define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button"
L
Linus Torvalds 已提交
53 54 55 56 57 58 59 60
#define ACPI_BUTTON_TYPE_SLEEP		0x03

#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
61
ACPI_MODULE_NAME("button");
L
Linus Torvalds 已提交
62

63
MODULE_AUTHOR("Paul Diefenbaugh");
64
MODULE_DESCRIPTION("ACPI Button Driver");
L
Linus Torvalds 已提交
65 66
MODULE_LICENSE("GPL");

67 68 69 70 71 72 73 74 75 76
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);

L
Len Brown 已提交
77 78
static int acpi_button_add(struct acpi_device *device);
static int acpi_button_remove(struct acpi_device *device, int type);
79
static int acpi_button_resume(struct acpi_device *device);
80
static void acpi_button_notify(struct acpi_device *device, u32 event);
81 82
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);
L
Linus Torvalds 已提交
83 84

static struct acpi_driver acpi_button_driver = {
L
Len Brown 已提交
85
	.name = "button",
L
Len Brown 已提交
86
	.class = ACPI_BUTTON_CLASS,
87
	.ids = button_device_ids,
L
Len Brown 已提交
88 89
	.ops = {
		.add = acpi_button_add,
90
		.resume = acpi_button_resume,
L
Len Brown 已提交
91
		.remove = acpi_button_remove,
92
		.notify = acpi_button_notify,
93
	},
L
Linus Torvalds 已提交
94 95 96
};

struct acpi_button {
97 98 99
	unsigned int type;
	struct input_dev *input;
	char phys[32];			/* for input device */
L
Len Brown 已提交
100
	unsigned long pushed;
L
Linus Torvalds 已提交
101 102
};

103
static const struct file_operations acpi_button_info_fops = {
104
	.owner = THIS_MODULE,
L
Len Brown 已提交
105 106 107 108
	.open = acpi_button_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
109 110
};

111
static const struct file_operations acpi_button_state_fops = {
112
	.owner = THIS_MODULE,
L
Len Brown 已提交
113 114 115 116
	.open = acpi_button_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
117
};
L
Len Brown 已提交
118

119 120 121
static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
static struct acpi_device *lid_device;

122 123 124 125
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
126
static struct proc_dir_entry *acpi_button_dir;
127 128 129

static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
{
130
	struct acpi_device *device = seq->private;
131

L
Len Brown 已提交
132
	seq_printf(seq, "type:                    %s\n",
133
		   acpi_device_name(device));
134
	return 0;
135 136 137 138 139 140
}

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);
}
L
Len Brown 已提交
141

142 143
static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
{
144
	struct acpi_device *device = seq->private;
L
Len Brown 已提交
145
	acpi_status status;
146
	unsigned long long state;
147

148
	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
149 150 151
	seq_printf(seq, "state:      %s\n",
		   ACPI_FAILURE(status) ? "unsupported" :
			(state ? "open" : "closed"));
152
	return 0;
153 154 155 156 157 158 159 160 161 162 163
}

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;

L
Len Brown 已提交
164
static int acpi_button_add_fs(struct acpi_device *device)
165
{
166
	struct acpi_button *button = acpi_driver_data(device);
L
Len Brown 已提交
167
	struct proc_dir_entry *entry = NULL;
168 169 170 171

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
		if (!acpi_power_dir)
L
Len Brown 已提交
172 173
			acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
						    acpi_button_dir);
174 175 176 177
		entry = acpi_power_dir;
		break;
	case ACPI_BUTTON_TYPE_SLEEP:
		if (!acpi_sleep_dir)
L
Len Brown 已提交
178 179
			acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
						    acpi_button_dir);
180 181 182 183
		entry = acpi_sleep_dir;
		break;
	case ACPI_BUTTON_TYPE_LID:
		if (!acpi_lid_dir)
L
Len Brown 已提交
184 185
			acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
						  acpi_button_dir);
186 187 188 189 190
		entry = acpi_lid_dir;
		break;
	}

	if (!entry)
191
		return -ENODEV;
192 193 194

	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
	if (!acpi_device_dir(device))
195
		return -ENODEV;
196 197

	/* 'info' [R] */
198 199
	entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
				 S_IRUGO, acpi_device_dir(device),
200
				 &acpi_button_info_fops, device);
201
	if (!entry)
202
		return -ENODEV;
203 204 205

	/* show lid state [R] */
	if (button->type == ACPI_BUTTON_TYPE_LID) {
206 207
		entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
					 S_IRUGO, acpi_device_dir(device),
208
					 &acpi_button_state_fops, device);
209
		if (!entry)
210
			return -ENODEV;
211 212
	}

213
	return 0;
214 215
}

L
Len Brown 已提交
216
static int acpi_button_remove_fs(struct acpi_device *device)
217
{
218
	struct acpi_button *button = acpi_driver_data(device);
219 220 221 222

	if (acpi_device_dir(device)) {
		if (button->type == ACPI_BUTTON_TYPE_LID)
			remove_proc_entry(ACPI_BUTTON_FILE_STATE,
L
Len Brown 已提交
223
					  acpi_device_dir(device));
224
		remove_proc_entry(ACPI_BUTTON_FILE_INFO,
L
Len Brown 已提交
225
				  acpi_device_dir(device));
226 227

		remove_proc_entry(acpi_device_bid(device),
L
Len Brown 已提交
228
				  acpi_device_dir(device)->parent);
229 230 231
		acpi_device_dir(device) = NULL;
	}

232
	return 0;
233 234
}

L
Linus Torvalds 已提交
235 236 237
/* --------------------------------------------------------------------------
                                Driver Interface
   -------------------------------------------------------------------------- */
238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
int acpi_lid_notifier_register(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
}
EXPORT_SYMBOL(acpi_lid_notifier_register);

int acpi_lid_notifier_unregister(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
}
EXPORT_SYMBOL(acpi_lid_notifier_unregister);

int acpi_lid_open(void)
{
	acpi_status status;
	unsigned long long state;

255 256 257
	if (!lid_device)
		return -ENODEV;

258 259 260 261 262 263 264 265 266
	status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
				       &state);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return !!state;
}
EXPORT_SYMBOL(acpi_lid_open);

267
static int acpi_lid_send_state(struct acpi_device *device)
268
{
269
	struct acpi_button *button = acpi_driver_data(device);
270
	unsigned long long state;
271
	acpi_status status;
272
	int ret;
273

274
	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
275 276
	if (ACPI_FAILURE(status))
		return -ENODEV;
B
Bjorn Helgaas 已提交
277

278 279
	/* input layer checks if event is redundant */
	input_report_switch(button->input, SW_LID, !state);
280
	input_sync(button->input);
281 282 283 284 285

	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
	if (ret == NOTIFY_DONE)
		ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
						   device);
286 287 288 289 290 291 292
	if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
		/*
		 * It is also regarded as success if the notifier_chain
		 * returns NOTIFY_OK or NOTIFY_DONE.
		 */
		ret = 0;
	}
293
	return ret;
294
}
L
Linus Torvalds 已提交
295

296
static void acpi_button_notify(struct acpi_device *device, u32 event)
L
Linus Torvalds 已提交
297
{
298
	struct acpi_button *button = acpi_driver_data(device);
299
	struct input_dev *input;
L
Linus Torvalds 已提交
300 301

	switch (event) {
302 303 304
	case ACPI_FIXED_HARDWARE_EVENT:
		event = ACPI_BUTTON_NOTIFY_STATUS;
		/* fall through */
L
Linus Torvalds 已提交
305
	case ACPI_BUTTON_NOTIFY_STATUS:
306 307
		input = button->input;
		if (button->type == ACPI_BUTTON_TYPE_LID) {
308
			acpi_lid_send_state(device);
309 310 311 312 313 314 315
		} 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);
316
			input_sync(input);
317 318
		}

319
		acpi_bus_generate_proc_event(device, event, ++button->pushed);
L
Linus Torvalds 已提交
320 321 322
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
Len Brown 已提交
323
				  "Unsupported event [0x%x]\n", event));
L
Linus Torvalds 已提交
324 325 326 327
		break;
	}
}

328 329
static int acpi_button_resume(struct acpi_device *device)
{
330
	struct acpi_button *button = acpi_driver_data(device);
B
Bjorn Helgaas 已提交
331

332
	if (button->type == ACPI_BUTTON_TYPE_LID)
333
		return acpi_lid_send_state(device);
334 335 336
	return 0;
}

337 338 339 340
static int acpi_button_add(struct acpi_device *device)
{
	struct acpi_button *button;
	struct input_dev *input;
341
	char *hid, *name, *class;
342
	int error;
L
Linus Torvalds 已提交
343

344
	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
L
Linus Torvalds 已提交
345
	if (!button)
346
		return -ENOMEM;
L
Linus Torvalds 已提交
347

348
	device->driver_data = button;
L
Linus Torvalds 已提交
349

350 351 352 353 354 355
	button->input = input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto err_free_button;
	}

356 357 358 359
	hid = acpi_device_hid(device);
	name = acpi_device_name(device);
	class = acpi_device_class(device);

360 361
	if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
	    !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
L
Linus Torvalds 已提交
362
		button->type = ACPI_BUTTON_TYPE_POWER;
363 364
		strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
		sprintf(class, "%s/%s",
L
Linus Torvalds 已提交
365
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
366 367
	} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
		   !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
L
Linus Torvalds 已提交
368
		button->type = ACPI_BUTTON_TYPE_SLEEP;
369 370
		strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
		sprintf(class, "%s/%s",
L
Linus Torvalds 已提交
371
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
372
	} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
L
Linus Torvalds 已提交
373
		button->type = ACPI_BUTTON_TYPE_LID;
374 375
		strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
		sprintf(class, "%s/%s",
L
Linus Torvalds 已提交
376
			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
L
Len Brown 已提交
377
	} else {
378
		printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
379 380
		error = -ENODEV;
		goto err_free_input;
L
Linus Torvalds 已提交
381 382
	}

383 384 385 386
	error = acpi_button_add_fs(device);
	if (error)
		goto err_free_input;

387
	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
388

389
	input->name = name;
390 391 392
	input->phys = button->phys;
	input->id.bustype = BUS_HOST;
	input->id.product = button->type;
393
	input->dev.parent = &device->dev;
394

L
Linus Torvalds 已提交
395
	switch (button->type) {
396
	case ACPI_BUTTON_TYPE_POWER:
397
		input->evbit[0] = BIT_MASK(EV_KEY);
398
		set_bit(KEY_POWER, input->keybit);
L
Linus Torvalds 已提交
399
		break;
400 401

	case ACPI_BUTTON_TYPE_SLEEP:
402
		input->evbit[0] = BIT_MASK(EV_KEY);
403
		set_bit(KEY_SLEEP, input->keybit);
L
Linus Torvalds 已提交
404
		break;
405 406

	case ACPI_BUTTON_TYPE_LID:
407
		input->evbit[0] = BIT_MASK(EV_SW);
408
		set_bit(SW_LID, input->swbit);
L
Linus Torvalds 已提交
409 410 411
		break;
	}

412 413
	error = input_register_device(input);
	if (error)
414
		goto err_remove_fs;
415
	if (button->type == ACPI_BUTTON_TYPE_LID) {
416
		acpi_lid_send_state(device);
417 418 419 420 421 422
		/*
		 * This assumes there's only one lid device, or if there are
		 * more we only care about the last one...
		 */
		lid_device = device;
	}
L
Linus Torvalds 已提交
423 424 425

	if (device->wakeup.flags.valid) {
		/* Button's GPE is run-wake GPE */
L
Len Brown 已提交
426
		acpi_enable_gpe(device->wakeup.gpe_device,
427
				device->wakeup.gpe_number,
428
				ACPI_GPE_TYPE_RUNTIME);
429
		device->wakeup.run_wake_count++;
L
Linus Torvalds 已提交
430 431 432
		device->wakeup.state.enabled = 1;
	}

433
	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
434
	return 0;
L
Linus Torvalds 已提交
435

436 437 438 439 440 441 442
 err_remove_fs:
	acpi_button_remove_fs(device);
 err_free_input:
	input_free_device(input);
 err_free_button:
	kfree(button);
	return error;
L
Linus Torvalds 已提交
443 444
}

L
Len Brown 已提交
445
static int acpi_button_remove(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
446
{
447
	struct acpi_button *button = acpi_driver_data(device);
L
Linus Torvalds 已提交
448

449 450 451
	if (device->wakeup.flags.valid) {
		acpi_disable_gpe(device->wakeup.gpe_device,
				device->wakeup.gpe_number,
452
				ACPI_GPE_TYPE_RUNTIME);
453
		device->wakeup.run_wake_count--;
454 455 456
		device->wakeup.state.enabled = 0;
	}

L
Len Brown 已提交
457
	acpi_button_remove_fs(device);
458
	input_unregister_device(button->input);
L
Linus Torvalds 已提交
459
	kfree(button);
460
	return 0;
L
Linus Torvalds 已提交
461 462
}

L
Len Brown 已提交
463
static int __init acpi_button_init(void)
L
Linus Torvalds 已提交
464
{
465
	int result;
L
Linus Torvalds 已提交
466

467 468
	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	if (!acpi_button_dir)
469
		return -ENODEV;
B
Bjorn Helgaas 已提交
470

L
Linus Torvalds 已提交
471 472
	result = acpi_bus_register_driver(&acpi_button_driver);
	if (result < 0) {
473
		remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
474
		return -ENODEV;
L
Linus Torvalds 已提交
475 476
	}

477
	return 0;
L
Linus Torvalds 已提交
478 479
}

L
Len Brown 已提交
480
static void __exit acpi_button_exit(void)
L
Linus Torvalds 已提交
481 482 483
{
	acpi_bus_unregister_driver(&acpi_button_driver);

L
Len Brown 已提交
484
	if (acpi_power_dir)
485 486 487 488 489 490
		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);
L
Linus Torvalds 已提交
491 492 493 494
}

module_init(acpi_button_init);
module_exit(acpi_button_exit);