ec.c 27.1 KB
Newer Older
L
Linus Torvalds 已提交
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
/*
 *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
 *  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/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
D
Dmitry Torokhov 已提交
34
#include <linux/interrupt.h>
L
Linus Torvalds 已提交
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/actypes.h>

#define _COMPONENT		ACPI_EC_COMPONENT
ACPI_MODULE_NAME		("acpi_ec")

#define ACPI_EC_COMPONENT		0x00100000
#define ACPI_EC_CLASS			"embedded_controller"
#define ACPI_EC_HID			"PNP0C09"
#define ACPI_EC_DRIVER_NAME		"ACPI Embedded Controller Driver"
#define ACPI_EC_DEVICE_NAME		"Embedded Controller"
#define ACPI_EC_FILE_INFO		"info"


#define ACPI_EC_FLAG_OBF	0x01	/* Output buffer full */
#define ACPI_EC_FLAG_IBF	0x02	/* Input buffer full */
D
Dmitry Torokhov 已提交
53
#define ACPI_EC_FLAG_BURST	0x10	/* burst mode */
L
Linus Torvalds 已提交
54 55 56 57 58
#define ACPI_EC_FLAG_SCI	0x20	/* EC-SCI occurred */

#define ACPI_EC_EVENT_OBF	0x01	/* Output buffer full */
#define ACPI_EC_EVENT_IBE	0x02	/* Input buffer empty */

D
Dmitry Torokhov 已提交
59
#define ACPI_EC_DELAY		50	/* Wait 50ms max. during EC ops */
L
Linus Torvalds 已提交
60 61 62 63
#define ACPI_EC_UDELAY_GLK	1000	/* Wait 1ms max. to get global lock */

#define ACPI_EC_COMMAND_READ	0x80
#define ACPI_EC_COMMAND_WRITE	0x81
D
Dmitry Torokhov 已提交
64 65
#define ACPI_EC_BURST_ENABLE	0x82
#define ACPI_EC_BURST_DISABLE	0x83
L
Linus Torvalds 已提交
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
#define ACPI_EC_COMMAND_QUERY	0x84

static int acpi_ec_add (struct acpi_device *device);
static int acpi_ec_remove (struct acpi_device *device, int type);
static int acpi_ec_start (struct acpi_device *device);
static int acpi_ec_stop (struct acpi_device *device, int type);

static struct acpi_driver acpi_ec_driver = {
	.name =		ACPI_EC_DRIVER_NAME,
	.class =	ACPI_EC_CLASS,
	.ids =		ACPI_EC_HID,
	.ops =		{
				.add =		acpi_ec_add,
				.remove =	acpi_ec_remove,
				.start =	acpi_ec_start,
				.stop =		acpi_ec_stop,
			},
};

struct acpi_ec {
	acpi_handle			handle;
	unsigned long			uid;
	unsigned long			gpe_bit;
	struct acpi_generic_address	status_addr;
	struct acpi_generic_address	command_addr;
	struct acpi_generic_address	data_addr;
	unsigned long			global_lock;
D
Dmitry Torokhov 已提交
93 94 95 96 97
	unsigned int			expect_event;
	atomic_t			leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/
	atomic_t			pending_gpe;
	struct semaphore		sem;
	wait_queue_head_t		wait;
L
Linus Torvalds 已提交
98 99 100 101 102 103 104 105 106 107 108 109
};

/* If we find an EC via the ECDT, we need to keep a ptr to its context */
static struct acpi_ec	*ec_ecdt;

/* External interfaces use first EC only, so remember */
static struct acpi_device *first_ec;

/* --------------------------------------------------------------------------
                             Transaction Management
   -------------------------------------------------------------------------- */

D
Dmitry Torokhov 已提交
110
static inline u32 acpi_ec_read_status(struct acpi_ec *ec)
L
Linus Torvalds 已提交
111
{
D
Dmitry Torokhov 已提交
112
	u32	status = 0;
L
Linus Torvalds 已提交
113

D
Dmitry Torokhov 已提交
114 115 116 117 118 119 120 121 122
	acpi_hw_low_level_read(8, &status, &ec->status_addr);
	return status;
}

static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event)
{
	int	result = 0;

	ACPI_FUNCTION_TRACE("acpi_ec_wait");
L
Linus Torvalds 已提交
123

D
Dmitry Torokhov 已提交
124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
	ec->expect_event = event;
	smp_mb();

	result = wait_event_interruptible_timeout(ec->wait,
					!ec->expect_event,
					msecs_to_jiffies(ACPI_EC_DELAY));
	
	ec->expect_event = 0;
	smp_mb();

	if (result < 0){
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result  = %d ", result));
		return_VALUE(result);
	}

	/*
	 * Verify that the event in question has actually happened by
	 * querying EC status. Do the check even if operation timed-out
	 * to make sure that we did not miss interrupt.
	 */
L
Linus Torvalds 已提交
144 145
	switch (event) {
	case ACPI_EC_EVENT_OBF:
D
Dmitry Torokhov 已提交
146 147
		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
			return_VALUE(0);
L
Linus Torvalds 已提交
148
		break;
D
Dmitry Torokhov 已提交
149

L
Linus Torvalds 已提交
150
	case ACPI_EC_EVENT_IBE:
D
Dmitry Torokhov 已提交
151 152
		if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
			return_VALUE(0);
L
Linus Torvalds 已提交
153 154 155
		break;
	}

D
Dmitry Torokhov 已提交
156
	return_VALUE(-ETIME);
L
Linus Torvalds 已提交
157 158 159
}


D
Dmitry Torokhov 已提交
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

static int
acpi_ec_enter_burst_mode (
	struct acpi_ec		*ec)
{
	u32			tmp = 0;
	int			status = 0;

	ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");

	status = acpi_ec_read_status(ec);
	if (status != -EINVAL &&
		!(status & ACPI_EC_FLAG_BURST)){
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n"));
		acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
		status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
		if (status){
			acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status));
			return_VALUE(-EINVAL);
		}
		acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
		if(tmp != 0x90 ) {/* Burst ACK byte*/
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n"));
			return_VALUE(-EINVAL);
		}
	} else
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n"));
	atomic_set(&ec->leaving_burst , 0);
	return_VALUE(0);
}

static int
acpi_ec_leave_burst_mode (
	struct acpi_ec		*ec)
{
	int			status =0;

	ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");

	atomic_set(&ec->leaving_burst , 1);
	status = acpi_ec_read_status(ec);
	if (status != -EINVAL &&
		(status & ACPI_EC_FLAG_BURST)){
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));
		acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr);
		status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
		if (status){
			acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n"));
			return_VALUE(-EINVAL);
		}
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
		status = acpi_ec_read_status(ec);
		if (status != -EINVAL &&
			(status & ACPI_EC_FLAG_BURST)) {
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n"));
			return_VALUE(-EINVAL);
		}
	}else
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n"));
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));

	return_VALUE(0);
}

L
Linus Torvalds 已提交
227 228 229 230 231 232
static int
acpi_ec_read (
	struct acpi_ec		*ec,
	u8			address,
	u32			*data)
{
D
Dmitry Torokhov 已提交
233 234
	int			status = 0;
	u32			glk;
L
Linus Torvalds 已提交
235 236 237 238 239 240

	ACPI_FUNCTION_TRACE("acpi_ec_read");

	if (!ec || !data)
		return_VALUE(-EINVAL);

D
Dmitry Torokhov 已提交
241
retry:
L
Linus Torvalds 已提交
242 243 244 245 246 247 248
	*data = 0;

	if (ec->global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}
D
Dmitry Torokhov 已提交
249 250 251 252 253 254

	WARN_ON(in_interrupt());
	down(&ec->sem);

	if(acpi_ec_enter_burst_mode(ec))
		goto end;
L
Linus Torvalds 已提交
255 256

	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
D
Dmitry Torokhov 已提交
257 258 259
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
	if (status) {
L
Linus Torvalds 已提交
260
		goto end;
D
Dmitry Torokhov 已提交
261
	}
L
Linus Torvalds 已提交
262 263

	acpi_hw_low_level_write(8, address, &ec->data_addr);
D
Dmitry Torokhov 已提交
264 265 266
	status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
	if (status){
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
267
		goto end;
D
Dmitry Torokhov 已提交
268
	}
L
Linus Torvalds 已提交
269 270

	acpi_hw_low_level_read(8, data, &ec->data_addr);
D
Dmitry Torokhov 已提交
271
	acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
272 273 274

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
		*data, address));
D
Dmitry Torokhov 已提交
275
	
L
Linus Torvalds 已提交
276
end:
D
Dmitry Torokhov 已提交
277 278
	acpi_ec_leave_burst_mode(ec);
	up(&ec->sem);
L
Linus Torvalds 已提交
279 280 281 282

	if (ec->global_lock)
		acpi_release_global_lock(glk);

D
Dmitry Torokhov 已提交
283 284 285 286 287 288 289 290 291 292
	if(atomic_read(&ec->leaving_burst) == 2){
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
		while(!atomic_read(&ec->pending_gpe)){
			msleep(1);	
		}
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
		goto retry;
	}

	return_VALUE(status);
L
Linus Torvalds 已提交
293 294 295 296 297 298 299 300 301
}


static int
acpi_ec_write (
	struct acpi_ec		*ec,
	u8			address,
	u8			data)
{
D
Dmitry Torokhov 已提交
302 303 304
	int			status = 0;
	u32			glk;
	u32			tmp;
L
Linus Torvalds 已提交
305 306 307 308 309

	ACPI_FUNCTION_TRACE("acpi_ec_write");

	if (!ec)
		return_VALUE(-EINVAL);
D
Dmitry Torokhov 已提交
310
retry:
L
Linus Torvalds 已提交
311 312 313 314 315 316
	if (ec->global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

D
Dmitry Torokhov 已提交
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
	WARN_ON(in_interrupt());
	down(&ec->sem);

	if(acpi_ec_enter_burst_mode(ec))
		goto end;

	status = acpi_ec_read_status(ec);
	if (status != -EINVAL &&
		!(status & ACPI_EC_FLAG_BURST)){
		acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
		status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
		if (status)
			goto end;
		acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
		if(tmp != 0x90 ) /* Burst ACK byte*/
			goto end;
	}
	/*Now we are in burst mode*/
L
Linus Torvalds 已提交
335 336

	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
D
Dmitry Torokhov 已提交
337 338 339
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
	if (status){
L
Linus Torvalds 已提交
340
		goto end;
D
Dmitry Torokhov 已提交
341
	}
L
Linus Torvalds 已提交
342 343

	acpi_hw_low_level_write(8, address, &ec->data_addr);
D
Dmitry Torokhov 已提交
344 345 346
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (status){
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
347
		goto end;
D
Dmitry Torokhov 已提交
348
	}
L
Linus Torvalds 已提交
349 350

	acpi_hw_low_level_write(8, data, &ec->data_addr);
D
Dmitry Torokhov 已提交
351 352 353
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
	if (status)
L
Linus Torvalds 已提交
354 355 356 357 358 359
		goto end;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
		data, address));

end:
D
Dmitry Torokhov 已提交
360 361
	acpi_ec_leave_burst_mode(ec);
	up(&ec->sem);
L
Linus Torvalds 已提交
362 363 364 365

	if (ec->global_lock)
		acpi_release_global_lock(glk);

D
Dmitry Torokhov 已提交
366 367 368 369 370 371 372 373 374 375
	if(atomic_read(&ec->leaving_burst) == 2){
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
		while(!atomic_read(&ec->pending_gpe)){
			msleep(1);	
		}
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
		goto retry;
	}

	return_VALUE(status);
L
Linus Torvalds 已提交
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
}

/*
 * Externally callable EC access functions. For now, assume 1 EC only
 */
int
ec_read(u8 addr, u8 *val)
{
	struct acpi_ec *ec;
	int err;
	u32 temp_data;

	if (!first_ec)
		return -ENODEV;

	ec = acpi_driver_data(first_ec);

	err = acpi_ec_read(ec, addr, &temp_data);

	if (!err) {
		*val = temp_data;
		return 0;
	}
	else
		return err;
}
EXPORT_SYMBOL(ec_read);

int
ec_write(u8 addr, u8 val)
{
	struct acpi_ec *ec;
	int err;

	if (!first_ec)
		return -ENODEV;

	ec = acpi_driver_data(first_ec);

	err = acpi_ec_write(ec, addr, val);

	return err;
}
EXPORT_SYMBOL(ec_write);


static int
acpi_ec_query (
	struct acpi_ec		*ec,
	u32			*data)
{
D
Dmitry Torokhov 已提交
427 428
	int			status = 0;
	u32			glk;
L
Linus Torvalds 已提交
429 430 431 432 433

	ACPI_FUNCTION_TRACE("acpi_ec_query");

	if (!ec || !data)
		return_VALUE(-EINVAL);
D
Dmitry Torokhov 已提交
434
retry:
L
Linus Torvalds 已提交
435 436 437 438 439 440 441 442
	*data = 0;

	if (ec->global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

D
Dmitry Torokhov 已提交
443 444 445
	down(&ec->sem);
	if(acpi_ec_enter_burst_mode(ec))
		goto end;
L
Linus Torvalds 已提交
446 447 448 449 450 451
	/*
	 * Query the EC to find out which _Qxx method we need to evaluate.
	 * Note that successful completion of the query causes the ACPI_EC_SCI
	 * bit to be cleared (and thus clearing the interrupt source).
	 */
	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
D
Dmitry Torokhov 已提交
452 453 454
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
	if (status){
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
455
		goto end;
D
Dmitry Torokhov 已提交
456 457
	}

L
Linus Torvalds 已提交
458
	acpi_hw_low_level_read(8, data, &ec->data_addr);
D
Dmitry Torokhov 已提交
459
	acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
460
	if (!*data)
D
Dmitry Torokhov 已提交
461
		status = -ENODATA;
L
Linus Torvalds 已提交
462 463

end:
D
Dmitry Torokhov 已提交
464 465
	acpi_ec_leave_burst_mode(ec);
	up(&ec->sem);
L
Linus Torvalds 已提交
466 467 468 469

	if (ec->global_lock)
		acpi_release_global_lock(glk);

D
Dmitry Torokhov 已提交
470 471 472 473 474 475 476 477 478 479
	if(atomic_read(&ec->leaving_burst) == 2){
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
		while(!atomic_read(&ec->pending_gpe)){
			msleep(1);	
		}
		acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
		goto retry;
	}

	return_VALUE(status);
L
Linus Torvalds 已提交
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
}


/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */

struct acpi_ec_query_data {
	acpi_handle		handle;
	u8			data;
};

static void
acpi_ec_gpe_query (
	void			*ec_cxt)
{
	struct acpi_ec		*ec = (struct acpi_ec *) ec_cxt;
D
Dmitry Torokhov 已提交
497 498
	u32			value;
	int			result = -ENODATA;
L
Linus Torvalds 已提交
499 500 501 502 503 504
	static char		object_name[5] = {'_','Q','0','0','\0'};
	const char		hex[] = {'0','1','2','3','4','5','6','7',
				         '8','9','A','B','C','D','E','F'};

	ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");

D
Dmitry Torokhov 已提交
505 506
	if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
		result = acpi_ec_query(ec, &value);
L
Linus Torvalds 已提交
507

D
Dmitry Torokhov 已提交
508
	if (result)
L
Linus Torvalds 已提交
509 510 511 512 513 514 515 516
		goto end;

	object_name[2] = hex[((value >> 4) & 0x0F)];
	object_name[3] = hex[(value & 0x0F)];

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));

	acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
D
Dmitry Torokhov 已提交
517 518 519
	atomic_dec(&ec->pending_gpe);
end:	
	return;
L
Linus Torvalds 已提交
520 521 522 523 524 525 526
}

static u32
acpi_ec_gpe_handler (
	void			*data)
{
	acpi_status		status = AE_OK;
D
Dmitry Torokhov 已提交
527
	u32			value;
L
Linus Torvalds 已提交
528 529 530 531 532 533 534
	struct acpi_ec		*ec = (struct acpi_ec *) data;

	if (!ec)
		return ACPI_INTERRUPT_NOT_HANDLED;

	acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);

D
Dmitry Torokhov 已提交
535
	value = acpi_ec_read_status(ec);
L
Linus Torvalds 已提交
536

D
Dmitry Torokhov 已提交
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
	if((value & ACPI_EC_FLAG_IBF) &&
		!(value & ACPI_EC_FLAG_BURST) &&
			(atomic_read(&ec->leaving_burst) == 0)) { 
	/*
	 * the embedded controller disables 
	 * burst mode for any reason other 
	 * than the burst disable command
	 * to process critical event.
	 */
		atomic_set(&ec->leaving_burst , 2); /* block current pending transaction
					and retry */
		wake_up(&ec->wait);
	}else {
		if ((ec->expect_event == ACPI_EC_EVENT_OBF &&
				(value & ACPI_EC_FLAG_OBF)) ||
	    			(ec->expect_event == ACPI_EC_EVENT_IBE &&
				!(value & ACPI_EC_FLAG_IBF))) {
			ec->expect_event = 0;
			wake_up(&ec->wait);
			
		}
	}

	if (value & ACPI_EC_FLAG_SCI){
		atomic_add(1, &ec->pending_gpe) ;
		status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
						acpi_ec_gpe_query, ec);
	} 

	return status == AE_OK ?
		ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
L
Linus Torvalds 已提交
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584
}

/* --------------------------------------------------------------------------
                             Address Space Management
   -------------------------------------------------------------------------- */

static acpi_status
acpi_ec_space_setup (
	acpi_handle		region_handle,
	u32			function,
	void			*handler_context,
	void			**return_context)
{
	/*
	 * The EC object is in the handler context and is needed
	 * when calling the acpi_ec_space_handler.
	 */
D
Dmitry Torokhov 已提交
585 586
	*return_context  = (function != ACPI_REGION_DEACTIVATE) ?
						handler_context : NULL;
L
Linus Torvalds 已提交
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602

	return AE_OK;
}


static acpi_status
acpi_ec_space_handler (
	u32			function,
	acpi_physical_address	address,
	u32			bit_width,
	acpi_integer		*value,
	void			*handler_context,
	void			*region_context)
{
	int			result = 0;
	struct acpi_ec		*ec = NULL;
L
Luming Yu 已提交
603
	u64			temp = *value;
L
Linus Torvalds 已提交
604 605 606 607 608 609 610 611
	acpi_integer		f_v = 0;
	int 			i = 0;

	ACPI_FUNCTION_TRACE("acpi_ec_space_handler");

	if ((address > 0xFF) || !value || !handler_context)
		return_VALUE(AE_BAD_PARAMETER);

L
Luming Yu 已提交
612
	if (bit_width != 8 && acpi_strict) {
L
Linus Torvalds 已提交
613
		printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
L
Luming Yu 已提交
614
		return_VALUE(AE_BAD_PARAMETER);
L
Linus Torvalds 已提交
615 616 617 618 619 620 621
	}

	ec = (struct acpi_ec *) handler_context;

next_byte:
	switch (function) {
	case ACPI_READ:
L
Luming Yu 已提交
622 623
		temp = 0;
		result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
L
Linus Torvalds 已提交
624 625
		break;
	case ACPI_WRITE:
L
Luming Yu 已提交
626
		result = acpi_ec_write(ec, (u8) address, (u8) temp);
L
Linus Torvalds 已提交
627 628 629 630 631 632 633 634
		break;
	default:
		result = -EINVAL;
		goto out;
		break;
	}

	bit_width -= 8;
L
Luming Yu 已提交
635 636 637 638 639
	if (bit_width) {
		if (function == ACPI_READ)
			f_v |= temp << 8 * i;
		if (function == ACPI_WRITE)
			temp >>= 8;
L
Linus Torvalds 已提交
640
		i++;
L
Luming Yu 已提交
641
		(u8)address ++;
L
Linus Torvalds 已提交
642 643 644
		goto next_byte;
	}

L
Luming Yu 已提交
645 646
	if (function == ACPI_READ) {
		f_v |= temp << 8 * i;
L
Linus Torvalds 已提交
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
		*value = f_v;
	}

		
out:
	switch (result) {
	case -EINVAL:
		return_VALUE(AE_BAD_PARAMETER);
		break;
	case -ENODEV:
		return_VALUE(AE_NOT_FOUND);
		break;
	case -ETIME:
		return_VALUE(AE_TIME);
		break;
	default:
		return_VALUE(AE_OK);
	}
}


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

static struct proc_dir_entry	*acpi_ec_dir;


static int
acpi_ec_read_info (struct seq_file *seq, void *offset)
{
	struct acpi_ec		*ec = (struct acpi_ec *) seq->private;

	ACPI_FUNCTION_TRACE("acpi_ec_read_info");

	if (!ec)
		goto end;

	seq_printf(seq, "gpe bit:                 0x%02x\n",
		(u32) ec->gpe_bit);
	seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
		(u32) ec->status_addr.address, (u32) ec->data_addr.address);
	seq_printf(seq, "use global lock:         %s\n",
		ec->global_lock?"yes":"no");

end:
	return_VALUE(0);
}

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

static struct file_operations acpi_ec_info_ops = {
	.open		= acpi_ec_info_open_fs,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.owner = THIS_MODULE,
};

static int
acpi_ec_add_fs (
	struct acpi_device	*device)
{
D
Dmitry Torokhov 已提交
713
	struct proc_dir_entry	*entry;
L
Linus Torvalds 已提交
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763

	ACPI_FUNCTION_TRACE("acpi_ec_add_fs");

	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
			acpi_ec_dir);
		if (!acpi_device_dir(device))
			return_VALUE(-ENODEV);
	}

	entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
		acpi_device_dir(device));
	if (!entry)
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
			"Unable to create '%s' fs entry\n",
			ACPI_EC_FILE_INFO));
	else {
		entry->proc_fops = &acpi_ec_info_ops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	return_VALUE(0);
}


static int
acpi_ec_remove_fs (
	struct acpi_device	*device)
{
	ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
		acpi_device_dir(device) = NULL;
	}

	return_VALUE(0);
}


/* --------------------------------------------------------------------------
                               Driver Interface
   -------------------------------------------------------------------------- */

static int
acpi_ec_add (
	struct acpi_device	*device)
{
D
Dmitry Torokhov 已提交
764 765 766
	int			result;
	acpi_status		status;
	struct acpi_ec		*ec;
L
Linus Torvalds 已提交
767 768 769 770 771 772 773 774 775 776 777 778 779 780
	unsigned long		uid;

	ACPI_FUNCTION_TRACE("acpi_ec_add");

	if (!device)
		return_VALUE(-EINVAL);

	ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
	if (!ec)
		return_VALUE(-ENOMEM);
	memset(ec, 0, sizeof(struct acpi_ec));

	ec->handle = device->handle;
	ec->uid = -1;
D
Dmitry Torokhov 已提交
781 782 783 784
 	atomic_set(&ec->pending_gpe, 0);
 	atomic_set(&ec->leaving_burst , 1);
 	init_MUTEX(&ec->sem);
 	init_waitqueue_head(&ec->wait);
L
Linus Torvalds 已提交
785 786 787 788 789 790 791 792 793 794 795 796 797
	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
	acpi_driver_data(device) = ec;

	/* Use the global lock for all EC transactions? */
	acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);

	/* If our UID matches the UID for the ECDT-enumerated EC,
	   we now have the *real* EC info, so kill the makeshift one.*/
	acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
	if (ec_ecdt && ec_ecdt->uid == uid) {
		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
D
Dmitry Torokhov 已提交
798

L
Linus Torvalds 已提交
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
		acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler);

		kfree(ec_ecdt);
	}

	/* Get GPE bit assignment (EC events). */
	/* TODO: Add support for _GPE returning a package */
	status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
			"Error obtaining GPE bit assignment\n"));
		result = -ENODEV;
		goto end;
	}

	result = acpi_ec_add_fs(device);
	if (result)
		goto end;

	printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
		acpi_device_name(device), acpi_device_bid(device),
		(u32) ec->gpe_bit);

	if (!first_ec)
		first_ec = device;

end:
	if (result)
		kfree(ec);

	return_VALUE(result);
}


static int
acpi_ec_remove (
	struct acpi_device	*device,
	int			type)
{
D
Dmitry Torokhov 已提交
838
	struct acpi_ec		*ec;
L
Linus Torvalds 已提交
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892

	ACPI_FUNCTION_TRACE("acpi_ec_remove");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	acpi_ec_remove_fs(device);

	kfree(ec);

	return_VALUE(0);
}


static acpi_status
acpi_ec_io_ports (
	struct acpi_resource	*resource,
	void			*context)
{
	struct acpi_ec		*ec = (struct acpi_ec *) context;
	struct acpi_generic_address *addr;

	if (resource->id != ACPI_RSTYPE_IO) {
		return AE_OK;
	}

	/*
	 * The first address region returned is the data port, and
	 * the second address region returned is the status/command
	 * port.
	 */
	if (ec->data_addr.register_bit_width == 0) {
		addr = &ec->data_addr;
	} else if (ec->command_addr.register_bit_width == 0) {
		addr = &ec->command_addr;
	} else {
		return AE_CTRL_TERMINATE;
	}

	addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	addr->register_bit_width = 8;
	addr->register_bit_offset = 0;
	addr->address = resource->data.io.min_base_address;

	return AE_OK;
}


static int
acpi_ec_start (
	struct acpi_device	*device)
{
D
Dmitry Torokhov 已提交
893 894
	acpi_status		status;
	struct acpi_ec		*ec;
L
Linus Torvalds 已提交
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949

	ACPI_FUNCTION_TRACE("acpi_ec_start");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	if (!ec)
		return_VALUE(-EINVAL);

	/*
	 * Get I/O port addresses. Convert to GAS format.
	 */
	status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
		acpi_ec_io_ports, ec);
	if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
		return_VALUE(-ENODEV);
	}

	ec->status_addr = ec->command_addr;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
		(u32) ec->gpe_bit, (u32) ec->command_addr.address,
		(u32) ec->data_addr.address));

	/*
	 * Install GPE handler
	 */
	status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
		ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
	if (ACPI_FAILURE(status)) {
		return_VALUE(-ENODEV);
	}
	acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR);

	status = acpi_install_address_space_handler (ec->handle,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
			&acpi_ec_space_setup, ec);
	if (ACPI_FAILURE(status)) {
		acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
		return_VALUE(-ENODEV);
	}

	return_VALUE(AE_OK);
}


static int
acpi_ec_stop (
	struct acpi_device	*device,
	int			type)
{
D
Dmitry Torokhov 已提交
950 951
	acpi_status		status;
	struct acpi_ec		*ec;
L
Linus Torvalds 已提交
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

	ACPI_FUNCTION_TRACE("acpi_ec_stop");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	status = acpi_remove_address_space_handler(ec->handle,
		ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	return_VALUE(0);
}

static acpi_status __init
acpi_fake_ecdt_callback (
	acpi_handle	handle,
	u32		Level,
	void		*context,
	void		**retval)
{
	acpi_status	status;

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
		acpi_ec_io_ports, ec_ecdt);
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->status_addr = ec_ecdt->command_addr;

	ec_ecdt->uid = -1;
	acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);

	status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->global_lock = TRUE;
	ec_ecdt->handle = handle;

	printk(KERN_INFO PREFIX  "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
		(u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
		(u32) ec_ecdt->data_addr.address);

	return AE_CTRL_TERMINATE;
}

/*
 * Some BIOS (such as some from Gateway laptops) access EC region very early
 * such as in BAT0._INI or EC._INI before an EC device is found and
 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
 * required, but if EC regison is accessed early, it is required.
 * The routine tries to workaround the BIOS bug by pre-scan EC device
 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
 * op region (since _REG isn't invoked yet). The assumption is true for
 * all systems found.
 */
static int __init
acpi_ec_fake_ecdt(void)
{
	acpi_status	status;
	int		ret = 0;

	printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");

	ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
	if (!ec_ecdt) {
		ret = -ENOMEM;
		goto error;
	}
	memset(ec_ecdt, 0, sizeof(struct acpi_ec));

	status = acpi_get_devices (ACPI_EC_HID,
				acpi_fake_ecdt_callback,
				NULL,
				NULL);
	if (ACPI_FAILURE(status)) {
		kfree(ec_ecdt);
		ec_ecdt = NULL;
		ret = -ENODEV;
		goto error;
	}
	return 0;
error:
	printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
	return ret;
}

static int __init
acpi_ec_get_real_ecdt(void)
{
	acpi_status		status;
	struct acpi_table_ecdt 	*ecdt_ptr;

D
Dmitry Torokhov 已提交
1050
	status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
L
Linus Torvalds 已提交
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
		(struct acpi_table_header **) &ecdt_ptr);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	printk(KERN_INFO PREFIX "Found ECDT\n");

	/*
	 * Generate a temporary ec context to use until the namespace is scanned
	 */
	ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
	if (!ec_ecdt)
		return -ENOMEM;
	memset(ec_ecdt, 0, sizeof(struct acpi_ec));

D
Dmitry Torokhov 已提交
1065 1066
 	init_MUTEX(&ec_ecdt->sem);
 	init_waitqueue_head(&ec_ecdt->wait);
L
Linus Torvalds 已提交
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
	ec_ecdt->command_addr = ecdt_ptr->ec_control;
	ec_ecdt->status_addr = ecdt_ptr->ec_control;
	ec_ecdt->data_addr = ecdt_ptr->ec_data;
	ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
	/* use the GL just to be safe */
	ec_ecdt->global_lock = TRUE;
	ec_ecdt->uid = ecdt_ptr->uid;

	status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
	if (ACPI_FAILURE(status)) {
		goto error;
	}

	return 0;
error:
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}

static int __initdata acpi_fake_ecdt_enabled;
int __init
acpi_ec_ecdt_probe (void)
{
	acpi_status		status;
	int			ret;

	ret = acpi_ec_get_real_ecdt();
	/* Try to make a fake ECDT */
	if (ret && acpi_fake_ecdt_enabled) {
		ret = acpi_ec_fake_ecdt();
	}

	if (ret)
		return 0;

	/*
	 * Install GPE handler
	 */
	status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
		ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
		ec_ecdt);
	if (ACPI_FAILURE(status)) {
		goto error;
	}
	acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR);

	status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
			&acpi_ec_space_setup, ec_ecdt);
	if (ACPI_FAILURE(status)) {
		acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
			&acpi_ec_gpe_handler);
		goto error;
	}

	return 0;

error:
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}


static int __init acpi_ec_init (void)
{
D
Dmitry Torokhov 已提交
1139
	int			result;
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182

	ACPI_FUNCTION_TRACE("acpi_ec_init");

	if (acpi_disabled)
		return_VALUE(0);

	acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
	if (!acpi_ec_dir)
		return_VALUE(-ENODEV);

	/* Now register the driver for the EC */
	result = acpi_bus_register_driver(&acpi_ec_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
		return_VALUE(-ENODEV);
	}

	return_VALUE(result);
}

subsys_initcall(acpi_ec_init);

/* EC driver currently not unloadable */
#if 0
static void __exit
acpi_ec_exit (void)
{
	ACPI_FUNCTION_TRACE("acpi_ec_exit");

	acpi_bus_unregister_driver(&acpi_ec_driver);

	remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);

	return_VOID;
}
#endif /* 0 */

static int __init acpi_fake_ecdt_setup(char *str)
{
	acpi_fake_ecdt_enabled = 1;
	return 0;
}
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);