via-pmu68k.c 19.4 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
/*
 * Device driver for the PMU on 68K-based Apple PowerBooks
 *
 * The VIA (versatile interface adapter) interfaces to the PMU,
 * a 6805 microprocessor core whose primary function is to control
 * battery charging and system power on the PowerBooks.
 * The PMU also controls the ADB (Apple Desktop Bus) which connects
 * to the keyboard and mouse, as well as the non-volatile RAM
 * and the RTC (real time clock) chip.
 *
 * Adapted for 68K PMU by Joshua M. Thompson
 *
 * Based largely on the PowerMac PMU code by Paul Mackerras and
 * Fabio Riccardi.
 *
 * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
 * and the Open Software Foundation, Inc.
 */

#include <stdarg.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/miscdevice.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/interrupt.h>

#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cuda.h>

#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>

#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

/* Misc minor number allocated for /dev/pmu */
#define PMU_MINOR	154

/* VIA registers - spaced 0x200 bytes apart */
#define RS		0x200		/* skip between registers */
#define B		0		/* B-side data */
#define A		RS		/* A-side data */
#define DIRB		(2*RS)		/* B-side direction (1=output) */
#define DIRA		(3*RS)		/* A-side direction (1=output) */
#define T1CL		(4*RS)		/* Timer 1 ctr/latch (low 8 bits) */
#define T1CH		(5*RS)		/* Timer 1 counter (high 8 bits) */
#define T1LL		(6*RS)		/* Timer 1 latch (low 8 bits) */
#define T1LH		(7*RS)		/* Timer 1 latch (high 8 bits) */
#define T2CL		(8*RS)		/* Timer 2 ctr/latch (low 8 bits) */
#define T2CH		(9*RS)		/* Timer 2 counter (high 8 bits) */
#define SR		(10*RS)		/* Shift register */
#define ACR		(11*RS)		/* Auxiliary control register */
#define PCR		(12*RS)		/* Peripheral control register */
#define IFR		(13*RS)		/* Interrupt flag register */
#define IER		(14*RS)		/* Interrupt enable register */
#define ANH		(15*RS)		/* A-side data, no handshake */

/* Bits in B data register: both active low */
#define TACK		0x02		/* Transfer acknowledge (input) */
#define TREQ		0x04		/* Transfer request (output) */

/* Bits in ACR */
#define SR_CTRL		0x1c		/* Shift register control bits */
#define SR_EXT		0x0c		/* Shift on external clock */
#define SR_OUT		0x10		/* Shift out if 1 */

/* Bits in IFR and IER */
#define SR_INT		0x04		/* Shift register full/empty */
#define CB1_INT		0x10		/* transition on CB1 input */

static enum pmu_state {
	idle,
	sending,
	intack,
	reading,
	reading_intr,
} pmu_state;

static struct adb_request *current_req;
static struct adb_request *last_req;
static struct adb_request *req_awaiting_reply;
static unsigned char interrupt_data[32];
static unsigned char *reply_ptr;
static int data_index;
static int data_len;
static int adb_int_pending;
static int pmu_adb_flags;
static int adb_dev_map;
static struct adb_request bright_req_1, bright_req_2, bright_req_3;
static int pmu_kind = PMU_UNKNOWN;
static int pmu_fully_inited;

int asleep;

static int pmu_probe(void);
static int pmu_init(void);
static void pmu_start(void);
static irqreturn_t pmu_interrupt(int irq, void *arg);
static int pmu_send_request(struct adb_request *req, int sync);
static int pmu_autopoll(int devs);
void pmu_poll(void);
static int pmu_reset_bus(void);

static void pmu_start(void);
static void send_byte(int x);
static void recv_byte(void);
static void pmu_done(struct adb_request *req);
static void pmu_handle_data(unsigned char *data, int len);
static void set_volume(int level);
static void pmu_enable_backlight(int on);
static void pmu_set_brightness(int level);

struct adb_driver via_pmu_driver = {
	"68K PMU",
	pmu_probe,
	pmu_init,
	pmu_send_request,
	pmu_autopoll,
	pmu_poll,
	pmu_reset_bus
};

/*
 * This table indicates for each PMU opcode:
 * - the number of data bytes to be sent with the command, or -1
 *   if a length byte should be sent,
 * - the number of response bytes which the PMU will return, or
 *   -1 if it will send a length byte.
 */
static s8 pmu_data_len[256][2] = {
/*	   0	   1	   2	   3	   4	   5	   6	   7  */
/*00*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*08*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*10*/	{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*18*/	{ 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
/*20*/	{-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
/*28*/	{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
/*30*/	{ 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*38*/	{ 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
/*40*/	{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*48*/	{ 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
/*50*/	{ 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
/*58*/	{ 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
/*60*/	{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*68*/	{ 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
/*70*/	{ 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*78*/	{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
/*80*/	{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*88*/	{ 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*90*/	{ 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*98*/	{ 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*a0*/	{ 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
/*a8*/	{ 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*b0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*b8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*c0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*c8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*d0*/	{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*d8*/	{ 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
/*e0*/	{-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
/*e8*/	{ 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
/*f0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*f8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
};

int pmu_probe(void)
{
	if (macintosh_config->adb_type == MAC_ADB_PB1) {
		pmu_kind = PMU_68K_V1;
	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
		pmu_kind = PMU_68K_V2;
	} else {
		return -ENODEV;
	}

	pmu_state = idle;

	return 0;
}

static int 
pmu_init(void)
{
	int timeout;
	volatile struct adb_request req;

	via2[B] |= TREQ;				/* negate TREQ */
	via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;	/* TACK in, TREQ out */

	pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
	timeout =  100000;
	while (!req.complete) {
		if (--timeout < 0) {
			printk(KERN_ERR "pmu_init: no response from PMU\n");
			return -EAGAIN;
		}
		udelay(10);
		pmu_poll();
	}

	/* ack all pending interrupts */
	timeout = 100000;
	interrupt_data[0] = 1;
	while (interrupt_data[0] || pmu_state != idle) {
		if (--timeout < 0) {
			printk(KERN_ERR "pmu_init: timed out acking intrs\n");
			return -EAGAIN;
		}
		if (pmu_state == idle) {
			adb_int_pending = 1;
			pmu_interrupt(0, NULL);
		}
		pmu_poll();
		udelay(10);
	}

	pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
			PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
	timeout =  100000;
	while (!req.complete) {
		if (--timeout < 0) {
			printk(KERN_ERR "pmu_init: no response from PMU\n");
			return -EAGAIN;
		}
		udelay(10);
		pmu_poll();
	}

	bright_req_1.complete = 1;
	bright_req_2.complete = 1;
	bright_req_3.complete = 1;

	if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
			pmu_interrupt)) {
		printk(KERN_ERR "pmu_init: can't get irq %d\n",
			IRQ_MAC_ADB_SR);
		return -EAGAIN;
	}
	if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
			pmu_interrupt)) {
		printk(KERN_ERR "pmu_init: can't get irq %d\n",
			IRQ_MAC_ADB_CL);
		free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
		return -EAGAIN;
	}

	pmu_fully_inited = 1;
	
	/* Enable backlight */
	pmu_enable_backlight(1);

	printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");

	return 0;
}

int
pmu_get_model(void)
{
	return pmu_kind;
}

/* Send an ADB command */
static int 
pmu_send_request(struct adb_request *req, int sync)
{
    int i, ret;

    if (!pmu_fully_inited)
    {
 	req->complete = 1;
   	return -ENXIO;
   }

    ret = -EINVAL;
	
    switch (req->data[0]) {
    case PMU_PACKET:
		for (i = 0; i < req->nbytes - 1; ++i)
			req->data[i] = req->data[i+1];
		--req->nbytes;
		if (pmu_data_len[req->data[0]][1] != 0) {
			req->reply[0] = ADB_RET_OK;
			req->reply_len = 1;
		} else
			req->reply_len = 0;
		ret = pmu_queue_request(req);
		break;
    case CUDA_PACKET:
		switch (req->data[1]) {
		case CUDA_GET_TIME:
			if (req->nbytes != 2)
				break;
			req->data[0] = PMU_READ_RTC;
			req->nbytes = 1;
			req->reply_len = 3;
			req->reply[0] = CUDA_PACKET;
			req->reply[1] = 0;
			req->reply[2] = CUDA_GET_TIME;
			ret = pmu_queue_request(req);
			break;
		case CUDA_SET_TIME:
			if (req->nbytes != 6)
				break;
			req->data[0] = PMU_SET_RTC;
			req->nbytes = 5;
			for (i = 1; i <= 4; ++i)
				req->data[i] = req->data[i+1];
			req->reply_len = 3;
			req->reply[0] = CUDA_PACKET;
			req->reply[1] = 0;
			req->reply[2] = CUDA_SET_TIME;
			ret = pmu_queue_request(req);
			break;
		case CUDA_GET_PRAM:
			if (req->nbytes != 4)
				break;
			req->data[0] = PMU_READ_NVRAM;
			req->data[1] = req->data[2];
			req->data[2] = req->data[3];
			req->nbytes = 3;
			req->reply_len = 3;
			req->reply[0] = CUDA_PACKET;
			req->reply[1] = 0;
			req->reply[2] = CUDA_GET_PRAM;
			ret = pmu_queue_request(req);
			break;
		case CUDA_SET_PRAM:
			if (req->nbytes != 5)
				break;
			req->data[0] = PMU_WRITE_NVRAM;
			req->data[1] = req->data[2];
			req->data[2] = req->data[3];
			req->data[3] = req->data[4];
			req->nbytes = 4;
			req->reply_len = 3;
			req->reply[0] = CUDA_PACKET;
			req->reply[1] = 0;
			req->reply[2] = CUDA_SET_PRAM;
			ret = pmu_queue_request(req);
			break;
		}
		break;
    case ADB_PACKET:
		for (i = req->nbytes - 1; i > 1; --i)
			req->data[i+2] = req->data[i];
		req->data[3] = req->nbytes - 2;
		req->data[2] = pmu_adb_flags;
		/*req->data[1] = req->data[1];*/
		req->data[0] = PMU_ADB_CMD;
		req->nbytes += 2;
		req->reply_expected = 1;
		req->reply_len = 0;
		ret = pmu_queue_request(req);
		break;
    }
    if (ret)
    {
    	req->complete = 1;
    	return ret;
    }
    	
    if (sync) {
	while (!req->complete)
		pmu_poll();
    }

    return 0;
}

/* Enable/disable autopolling */
static int 
pmu_autopoll(int devs)
{
	struct adb_request req;

	if (!pmu_fully_inited) return -ENXIO;

	if (devs) {
		adb_dev_map = devs;
		pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
			    adb_dev_map >> 8, adb_dev_map);
		pmu_adb_flags = 2;
	} else {
		pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
		pmu_adb_flags = 0;
	}
	while (!req.complete)
		pmu_poll();
	return 0;
}

/* Reset the ADB bus */
static int 
pmu_reset_bus(void)
{
	struct adb_request req;
	long timeout;
	int save_autopoll = adb_dev_map;

	if (!pmu_fully_inited) return -ENXIO;

	/* anyone got a better idea?? */
	pmu_autopoll(0);

	req.nbytes = 5;
	req.done = NULL;
	req.data[0] = PMU_ADB_CMD;
	req.data[1] = 0;
	req.data[2] = 3; /* ADB_BUSRESET ??? */
	req.data[3] = 0;
	req.data[4] = 0;
	req.reply_len = 0;
	req.reply_expected = 1;
	if (pmu_queue_request(&req) != 0)
	{
		printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
		return -EIO;
	}
	while (!req.complete)
		pmu_poll();
	timeout = 100000;
	while (!req.complete) {
		if (--timeout < 0) {
			printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
			return -EIO;
		}
		udelay(10);
		pmu_poll();
	}

	if (save_autopoll != 0)
		pmu_autopoll(save_autopoll);
		
	return 0;
}

/* Construct and send a pmu request */
int 
pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
	    int nbytes, ...)
{
	va_list list;
	int i;

	if (nbytes < 0 || nbytes > 32) {
		printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
		req->complete = 1;
		return -EINVAL;
	}
	req->nbytes = nbytes;
	req->done = done;
	va_start(list, nbytes);
	for (i = 0; i < nbytes; ++i)
		req->data[i] = va_arg(list, int);
	va_end(list);
	if (pmu_data_len[req->data[0]][1] != 0) {
		req->reply[0] = ADB_RET_OK;
		req->reply_len = 1;
	} else
		req->reply_len = 0;
	req->reply_expected = 0;
	return pmu_queue_request(req);
}

int
pmu_queue_request(struct adb_request *req)
{
	unsigned long flags;
	int nsend;

	if (req->nbytes <= 0) {
		req->complete = 1;
		return 0;
	}
	nsend = pmu_data_len[req->data[0]][0];
	if (nsend >= 0 && req->nbytes != nsend + 1) {
		req->complete = 1;
		return -EINVAL;
	}

	req->next = NULL;
	req->sent = 0;
	req->complete = 0;
	local_irq_save(flags);

	if (current_req != 0) {
		last_req->next = req;
		last_req = req;
	} else {
		current_req = req;
		last_req = req;
		if (pmu_state == idle)
			pmu_start();
	}

	local_irq_restore(flags);
	return 0;
}

static void 
send_byte(int x)
{
	via1[ACR] |= SR_CTRL;
	via1[SR] = x;
	via2[B] &= ~TREQ;		/* assert TREQ */
}

static void 
recv_byte(void)
{
	char c;

	via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
	c = via1[SR];		/* resets SR */
	via2[B] &= ~TREQ;
}

static void 
pmu_start(void)
{
	unsigned long flags;
	struct adb_request *req;

	/* assert pmu_state == idle */
	/* get the packet to send */
	local_irq_save(flags);
	req = current_req;
	if (req == 0 || pmu_state != idle
	    || (req->reply_expected && req_awaiting_reply))
		goto out;

	pmu_state = sending;
	data_index = 1;
	data_len = pmu_data_len[req->data[0]][0];

	/* set the shift register to shift out and send a byte */
	send_byte(req->data[0]);

out:
	local_irq_restore(flags);
}

void 
pmu_poll(void)
{
	unsigned long flags;

	local_irq_save(flags);
	if (via1[IFR] & SR_INT) {
		via1[IFR] = SR_INT;
		pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
	}
	if (via1[IFR] & CB1_INT) {
		via1[IFR] = CB1_INT;
		pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
	}
	local_irq_restore(flags);
}

static irqreturn_t
pmu_interrupt(int irq, void *dev_id)
{
	struct adb_request *req;
	int timeout, bite = 0;	/* to prevent compiler warning */

#if 0
	printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
		irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
#endif

	if (irq == IRQ_MAC_ADB_CL) {		/* CB1 interrupt */
		adb_int_pending = 1;
	} else if (irq == IRQ_MAC_ADB_SR) {	/* SR interrupt  */
		if (via2[B] & TACK) {
			printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
		}

		/* if reading grab the byte */
		if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];

		/* reset TREQ and wait for TACK to go high */
		via2[B] |= TREQ;
		timeout = 3200;
		while (!(via2[B] & TACK)) {
			if (--timeout < 0) {
				printk(KERN_ERR "PMU not responding (!ack)\n");
				goto finish;
			}
			udelay(10);
		}

		switch (pmu_state) {
		case sending:
			req = current_req;
			if (data_len < 0) {
				data_len = req->nbytes - 1;
				send_byte(data_len);
				break;
			}
			if (data_index <= data_len) {
				send_byte(req->data[data_index++]);
				break;
			}
			req->sent = 1;
			data_len = pmu_data_len[req->data[0]][1];
			if (data_len == 0) {
				pmu_state = idle;
				current_req = req->next;
				if (req->reply_expected)
					req_awaiting_reply = req;
				else
					pmu_done(req);
			} else {
				pmu_state = reading;
				data_index = 0;
				reply_ptr = req->reply + req->reply_len;
				recv_byte();
			}
			break;

		case intack:
			data_index = 0;
			data_len = -1;
			pmu_state = reading_intr;
			reply_ptr = interrupt_data;
			recv_byte();
			break;

		case reading:
		case reading_intr:
			if (data_len == -1) {
				data_len = bite;
				if (bite > 32)
					printk(KERN_ERR "PMU: bad reply len %d\n",
					       bite);
			} else {
				reply_ptr[data_index++] = bite;
			}
			if (data_index < data_len) {
				recv_byte();
				break;
			}

			if (pmu_state == reading_intr) {
				pmu_handle_data(interrupt_data, data_index);
			} else {
				req = current_req;
				current_req = req->next;
				req->reply_len += data_index;
				pmu_done(req);
			}
			pmu_state = idle;

			break;

		default:
			printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
			       pmu_state);
		}
	}
finish:
	if (pmu_state == idle) {
		if (adb_int_pending) {
			pmu_state = intack;
			send_byte(PMU_INT_ACK);
			adb_int_pending = 0;
		} else if (current_req) {
			pmu_start();
		}
	}

#if 0
	printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
		pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
#endif
	return IRQ_HANDLED;
}

static void 
pmu_done(struct adb_request *req)
{
	req->complete = 1;
	if (req->done)
		(*req->done)(req);
}

/* Interrupt data could be the result data from an ADB cmd */
static void 
pmu_handle_data(unsigned char *data, int len)
{
	static int show_pmu_ints = 1;

	asleep = 0;
	if (len < 1) {
		adb_int_pending = 0;
		return;
	}
	if (data[0] & PMU_INT_ADB) {
		if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
			struct adb_request *req = req_awaiting_reply;
			if (req == 0) {
				printk(KERN_ERR "PMU: extra ADB reply\n");
				return;
			}
			req_awaiting_reply = NULL;
			if (len <= 2)
				req->reply_len = 0;
			else {
				memcpy(req->reply, data + 1, len - 1);
				req->reply_len = len - 1;
			}
			pmu_done(req);
		} else {
			adb_input(data+1, len-1, 1);
		}
	} else {
		if (data[0] == 0x08 && len == 3) {
			/* sound/brightness buttons pressed */
			pmu_set_brightness(data[1] >> 3);
			set_volume(data[2]);
		} else if (show_pmu_ints
			   && !(data[0] == PMU_INT_TICK && len == 1)) {
			int i;
			printk(KERN_DEBUG "pmu intr");
			for (i = 0; i < len; ++i)
				printk(" %.2x", data[i]);
			printk("\n");
		}
	}
}

static int backlight_level = -1;
static int backlight_enabled = 0;

#define LEVEL_TO_BRIGHT(lev)	((lev) < 1? 0x7f: 0x4a - ((lev) << 1))

static void 
pmu_enable_backlight(int on)
{
	struct adb_request req;

	if (on) {
	    /* first call: get current backlight value */
	    if (backlight_level < 0) {
		switch(pmu_kind) {
		    case PMU_68K_V1:
		    case PMU_68K_V2:
			pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
			while (!req.complete)
				pmu_poll();
			printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
			backlight_level = req.reply[1];
			break;
		    default:
		        backlight_enabled = 0;
		        return;
		}
	    }
	    pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
	    	LEVEL_TO_BRIGHT(backlight_level));
	    while (!req.complete)
		pmu_poll();
	}
	pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
	    PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
	while (!req.complete)
		pmu_poll();
	backlight_enabled = on;
}

static void 
pmu_set_brightness(int level)
{
	int bright;

	backlight_level = level;
	bright = LEVEL_TO_BRIGHT(level);
	if (!backlight_enabled)
		return;
	if (bright_req_1.complete)
		pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
		    bright);
	if (bright_req_2.complete)
		pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
		    PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
}

void 
pmu_enable_irled(int on)
{
	struct adb_request req;

	pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
	    (on ? PMU_POW_ON : PMU_POW_OFF));
	while (!req.complete)
		pmu_poll();
}

static void 
set_volume(int level)
{
}

int
pmu_present(void)
{
	return (pmu_kind != PMU_UNKNOWN);
}