LXR linux/drivers/macintosh/via-pmu68k.c

   1/*
   2 * Device driver for the PMU on 68K-based Apple PowerBooks
   3 *
   4 * The VIA (versatile interface adapter) interfaces to the PMU,
   5 * a 6805 microprocessor core whose primary function is to control
   6 * battery charging and system power on the PowerBooks.
   7 * The PMU also controls the ADB (Apple Desktop Bus) which connects
   8 * to the keyboard and mouse, as well as the non-volatile RAM
   9 * and the RTC (real time clock) chip.
  10 *
  11 * Adapted for 68K PMU by Joshua M. Thompson
  12 *
  13 * Based largely on the PowerMac PMU code by Paul Mackerras and
  14 * Fabio Riccardi.
  15 *
  16 * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
  17 * and the Open Software Foundation, Inc.
  18 */
  19
  20#include <stdarg.h>
  21#include <linux/types.h>
  22#include <linux/errno.h>
  23#include <linux/kernel.h>
  24#include <linux/delay.h>
  25#include <linux/miscdevice.h>
  26#include <linux/blkdev.h>
  27#include <linux/pci.h>
  28#include <linux/slab.h>
  29#include <linux/init.h>
  30#include <linux/interrupt.h>
  31
  32#include <linux/adb.h>
  33#include <linux/pmu.h>
  34#include <linux/cuda.h>
  35
  36#include <asm/macintosh.h>
  37#include <asm/macints.h>
  38#include <asm/mac_via.h>
  39
  40#include <asm/pgtable.h>
  41#include <asm/system.h>
  42#include <asm/irq.h>
  43#include <asm/uaccess.h>
  44
  45/* Misc minor number allocated for /dev/pmu */
  46#define PMU_MINOR       154
  47
  48/* VIA registers - spaced 0x200 bytes apart */
  49#define RS              0x200           /* skip between registers */
  50#define B               0               /* B-side data */
  51#define A               RS              /* A-side data */
  52#define DIRB            (2*RS)          /* B-side direction (1=output) */
  53#define DIRA            (3*RS)          /* A-side direction (1=output) */
  54#define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  55#define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  56#define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  57#define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  58#define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  59#define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  60#define SR              (10*RS)         /* Shift register */
  61#define ACR             (11*RS)         /* Auxiliary control register */
  62#define PCR             (12*RS)         /* Peripheral control register */
  63#define IFR             (13*RS)         /* Interrupt flag register */
  64#define IER             (14*RS)         /* Interrupt enable register */
  65#define ANH             (15*RS)         /* A-side data, no handshake */
  66
  67/* Bits in B data register: both active low */
  68#define TACK            0x02            /* Transfer acknowledge (input) */
  69#define TREQ            0x04            /* Transfer request (output) */
  70
  71/* Bits in ACR */
  72#define SR_CTRL         0x1c            /* Shift register control bits */
  73#define SR_EXT          0x0c            /* Shift on external clock */
  74#define SR_OUT          0x10            /* Shift out if 1 */
  75
  76/* Bits in IFR and IER */
  77#define SR_INT          0x04            /* Shift register full/empty */
  78#define CB1_INT         0x10            /* transition on CB1 input */
  79
  80static enum pmu_state {
  81        idle,
  82        sending,
  83        intack,
  84        reading,
  85        reading_intr,
  86} pmu_state;
  87
  88static struct adb_request *current_req;
  89static struct adb_request *last_req;
  90static struct adb_request *req_awaiting_reply;
  91static unsigned char interrupt_data[32];
  92static unsigned char *reply_ptr;
  93static int data_index;
  94static int data_len;
  95static int adb_int_pending;
  96static int pmu_adb_flags;
  97static int adb_dev_map;
  98static struct adb_request bright_req_1, bright_req_2, bright_req_3;
  99static int pmu_kind = PMU_UNKNOWN;
 100static int pmu_fully_inited;
 101
 102int asleep;
 103
 104static int pmu_probe(void);
 105static int pmu_init(void);
 106static void pmu_start(void);
 107static irqreturn_t pmu_interrupt(int irq, void *arg);
 108static int pmu_send_request(struct adb_request *req, int sync);
 109static int pmu_autopoll(int devs);
 110void pmu_poll(void);
 111static int pmu_reset_bus(void);
 112
 113static void pmu_start(void);
 114static void send_byte(int x);
 115static void recv_byte(void);
 116static void pmu_done(struct adb_request *req);
 117static void pmu_handle_data(unsigned char *data, int len);
 118static void set_volume(int level);
 119static void pmu_enable_backlight(int on);
 120static void pmu_set_brightness(int level);
 121
 122struct adb_driver via_pmu_driver = {
 123        "68K PMU",
 124        pmu_probe,
 125        pmu_init,
 126        pmu_send_request,
 127        pmu_autopoll,
 128        pmu_poll,
 129        pmu_reset_bus
 130};
 131
 132/*
 133 * This table indicates for each PMU opcode:
 134 * - the number of data bytes to be sent with the command, or -1
 135 *   if a length byte should be sent,
 136 * - the number of response bytes which the PMU will return, or
 137 *   -1 if it will send a length byte.
 138 */
 139static s8 pmu_data_len[256][2] = {
 140/*         0       1       2       3       4       5       6       7  */
 141/*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 142/*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 143/*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 144/*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 145/*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 146/*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 147/*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 148/*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 149/*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 150/*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 151/*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 152/*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 153/*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 154/*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 155/*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 156/*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 157/*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 158/*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 159/*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 160/*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 161/*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 162/*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 163/*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 164/*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 165/*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 166/*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 167/*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 168/*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 169/*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 170/*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 171/*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 172/*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 173};
 174
 175int pmu_probe(void)
 176{
 177        if (macintosh_config->adb_type == MAC_ADB_PB1) {
 178                pmu_kind = PMU_68K_V1;
 179        } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 180                pmu_kind = PMU_68K_V2;
 181        } else {
 182                return -ENODEV;
 183        }
 184
 185        pmu_state = idle;
 186
 187        return 0;
 188}
 189
 190static int 
 191pmu_init(void)
 192{
 193        int timeout;
 194        volatile struct adb_request req;
 195
 196        via2[B] |= TREQ;                                /* negate TREQ */
 197        via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 198
 199        pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 200        timeout =  100000;
 201        while (!req.complete) {
 202                if (--timeout < 0) {
 203                        printk(KERN_ERR "pmu_init: no response from PMU\n");
 204                        return -EAGAIN;
 205                }
 206                udelay(10);
 207                pmu_poll();
 208        }
 209
 210        /* ack all pending interrupts */
 211        timeout = 100000;
 212        interrupt_data[0] = 1;
 213        while (interrupt_data[0] || pmu_state != idle) {
 214                if (--timeout < 0) {
 215                        printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 216                        return -EAGAIN;
 217                }
 218                if (pmu_state == idle) {
 219                        adb_int_pending = 1;
 220                        pmu_interrupt(0, NULL);
 221                }
 222                pmu_poll();
 223                udelay(10);
 224        }
 225
 226        pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 227                        PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 228        timeout =  100000;
 229        while (!req.complete) {
 230                if (--timeout < 0) {
 231                        printk(KERN_ERR "pmu_init: no response from PMU\n");
 232                        return -EAGAIN;
 233                }
 234                udelay(10);
 235                pmu_poll();
 236        }
 237
 238        bright_req_1.complete = 1;
 239        bright_req_2.complete = 1;
 240        bright_req_3.complete = 1;
 241
 242        if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 243                        pmu_interrupt)) {
 244                printk(KERN_ERR "pmu_init: can't get irq %d\n",
 245                        IRQ_MAC_ADB_SR);
 246                return -EAGAIN;
 247        }
 248        if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 249                        pmu_interrupt)) {
 250                printk(KERN_ERR "pmu_init: can't get irq %d\n",
 251                        IRQ_MAC_ADB_CL);
 252                free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 253                return -EAGAIN;
 254        }
 255
 256        pmu_fully_inited = 1;
 257        
 258        /* Enable backlight */
 259        pmu_enable_backlight(1);
 260
 261        printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 262
 263        return 0;
 264}
 265
 266int
 267pmu_get_model(void)
 268{
 269        return pmu_kind;
 270}
 271
 272/* Send an ADB command */
 273static int 
 274pmu_send_request(struct adb_request *req, int sync)
 275{
 276    int i, ret;
 277
 278    if (!pmu_fully_inited)
 279    {
 280        req->complete = 1;
 281        return -ENXIO;
 282   }
 283
 284    ret = -EINVAL;
 285        
 286    switch (req->data[0]) {
 287    case PMU_PACKET:
 288                for (i = 0; i < req->nbytes - 1; ++i)
 289                        req->data[i] = req->data[i+1];
 290                --req->nbytes;
 291                if (pmu_data_len[req->data[0]][1] != 0) {
 292                        req->reply[0] = ADB_RET_OK;
 293                        req->reply_len = 1;
 294                } else
 295                        req->reply_len = 0;
 296                ret = pmu_queue_request(req);
 297                break;
 298    case CUDA_PACKET:
 299                switch (req->data[1]) {
 300                case CUDA_GET_TIME:
 301                        if (req->nbytes != 2)
 302                                break;
 303                        req->data[0] = PMU_READ_RTC;
 304                        req->nbytes = 1;
 305                        req->reply_len = 3;
 306                        req->reply[0] = CUDA_PACKET;
 307                        req->reply[1] = 0;
 308                        req->reply[2] = CUDA_GET_TIME;
 309                        ret = pmu_queue_request(req);
 310                        break;
 311                case CUDA_SET_TIME:
 312                        if (req->nbytes != 6)
 313                                break;
 314                        req->data[0] = PMU_SET_RTC;
 315                        req->nbytes = 5;
 316                        for (i = 1; i <= 4; ++i)
 317                                req->data[i] = req->data[i+1];
 318                        req->reply_len = 3;
 319                        req->reply[0] = CUDA_PACKET;
 320                        req->reply[1] = 0;
 321                        req->reply[2] = CUDA_SET_TIME;
 322                        ret = pmu_queue_request(req);
 323                        break;
 324                case CUDA_GET_PRAM:
 325                        if (req->nbytes != 4)
 326                                break;
 327                        req->data[0] = PMU_READ_NVRAM;
 328                        req->data[1] = req->data[2];
 329                        req->data[2] = req->data[3];
 330                        req->nbytes = 3;
 331                        req->reply_len = 3;
 332                        req->reply[0] = CUDA_PACKET;
 333                        req->reply[1] = 0;
 334                        req->reply[2] = CUDA_GET_PRAM;
 335                        ret = pmu_queue_request(req);
 336                        break;
 337                case CUDA_SET_PRAM:
 338                        if (req->nbytes != 5)
 339                                break;
 340                        req->data[0] = PMU_WRITE_NVRAM;
 341                        req->data[1] = req->data[2];
 342                        req->data[2] = req->data[3];
 343                        req->data[3] = req->data[4];
 344                        req->nbytes = 4;
 345                        req->reply_len = 3;
 346                        req->reply[0] = CUDA_PACKET;
 347                        req->reply[1] = 0;
 348                        req->reply[2] = CUDA_SET_PRAM;
 349                        ret = pmu_queue_request(req);
 350                        break;
 351                }
 352                break;
 353    case ADB_PACKET:
 354                for (i = req->nbytes - 1; i > 1; --i)
 355                        req->data[i+2] = req->data[i];
 356                req->data[3] = req->nbytes - 2;
 357                req->data[2] = pmu_adb_flags;
 358                /*req->data[1] = req->data[1];*/
 359                req->data[0] = PMU_ADB_CMD;
 360                req->nbytes += 2;
 361                req->reply_expected = 1;
 362                req->reply_len = 0;
 363                ret = pmu_queue_request(req);
 364                break;
 365    }
 366    if (ret)
 367    {
 368        req->complete = 1;
 369        return ret;
 370    }
 371        
 372    if (sync) {
 373        while (!req->complete)
 374                pmu_poll();
 375    }
 376
 377    return 0;
 378}
 379
 380/* Enable/disable autopolling */
 381static int 
 382pmu_autopoll(int devs)
 383{
 384        struct adb_request req;
 385
 386        if (!pmu_fully_inited) return -ENXIO;
 387
 388        if (devs) {
 389                adb_dev_map = devs;
 390                pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 391                            adb_dev_map >> 8, adb_dev_map);
 392                pmu_adb_flags = 2;
 393        } else {
 394                pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 395                pmu_adb_flags = 0;
 396        }
 397        while (!req.complete)
 398                pmu_poll();
 399        return 0;
 400}
 401
 402/* Reset the ADB bus */
 403static int 
 404pmu_reset_bus(void)
 405{
 406        struct adb_request req;
 407        long timeout;
 408        int save_autopoll = adb_dev_map;
 409
 410        if (!pmu_fully_inited) return -ENXIO;
 411
 412        /* anyone got a better idea?? */
 413        pmu_autopoll(0);
 414
 415        req.nbytes = 5;
 416        req.done = NULL;
 417        req.data[0] = PMU_ADB_CMD;
 418        req.data[1] = 0;
 419        req.data[2] = 3; /* ADB_BUSRESET ??? */
 420        req.data[3] = 0;
 421        req.data[4] = 0;
 422        req.reply_len = 0;
 423        req.reply_expected = 1;
 424        if (pmu_queue_request(&req) != 0)
 425        {
 426                printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 427                return -EIO;
 428        }
 429        while (!req.complete)
 430                pmu_poll();
 431        timeout = 100000;
 432        while (!req.complete) {
 433                if (--timeout < 0) {
 434                        printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 435                        return -EIO;
 436                }
 437                udelay(10);
 438                pmu_poll();
 439        }
 440
 441        if (save_autopoll != 0)
 442                pmu_autopoll(save_autopoll);
 443                
 444        return 0;
 445}
 446
 447/* Construct and send a pmu request */
 448int 
 449pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 450            int nbytes, ...)
 451{
 452        va_list list;
 453        int i;
 454
 455        if (nbytes < 0 || nbytes > 32) {
 456                printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 457                req->complete = 1;
 458                return -EINVAL;
 459        }
 460        req->nbytes = nbytes;
 461        req->done = done;
 462        va_start(list, nbytes);
 463        for (i = 0; i < nbytes; ++i)
 464                req->data[i] = va_arg(list, int);
 465        va_end(list);
 466        if (pmu_data_len[req->data[0]][1] != 0) {
 467                req->reply[0] = ADB_RET_OK;
 468                req->reply_len = 1;
 469        } else
 470                req->reply_len = 0;
 471        req->reply_expected = 0;
 472        return pmu_queue_request(req);
 473}
 474
 475int
 476pmu_queue_request(struct adb_request *req)
 477{
 478        unsigned long flags;
 479        int nsend;
 480
 481        if (req->nbytes <= 0) {
 482                req->complete = 1;
 483                return 0;
 484        }
 485        nsend = pmu_data_len[req->data[0]][0];
 486        if (nsend >= 0 && req->nbytes != nsend + 1) {
 487                req->complete = 1;
 488                return -EINVAL;
 489        }
 490
 491        req->next = NULL;
 492        req->sent = 0;
 493        req->complete = 0;
 494        local_irq_save(flags);
 495
 496        if (current_req != 0) {
 497                last_req->next = req;
 498                last_req = req;
 499        } else {
 500                current_req = req;
 501                last_req = req;
 502                if (pmu_state == idle)
 503                        pmu_start();
 504        }
 505
 506        local_irq_restore(flags);
 507        return 0;
 508}
 509
 510static void 
 511send_byte(int x)
 512{
 513        via1[ACR] |= SR_CTRL;
 514        via1[SR] = x;
 515        via2[B] &= ~TREQ;               /* assert TREQ */
 516}
 517
 518static void 
 519recv_byte(void)
 520{
 521        char c;
 522
 523        via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 524        c = via1[SR];           /* resets SR */
 525        via2[B] &= ~TREQ;
 526}
 527
 528static void 
 529pmu_start(void)
 530{
 531        unsigned long flags;
 532        struct adb_request *req;
 533
 534        /* assert pmu_state == idle */
 535        /* get the packet to send */
 536        local_irq_save(flags);
 537        req = current_req;
 538        if (req == 0 || pmu_state != idle
 539            || (req->reply_expected && req_awaiting_reply))
 540                goto out;
 541
 542        pmu_state = sending;
 543        data_index = 1;
 544        data_len = pmu_data_len[req->data[0]][0];
 545
 546        /* set the shift register to shift out and send a byte */
 547        send_byte(req->data[0]);
 548
 549out:
 550        local_irq_restore(flags);
 551}
 552
 553void 
 554pmu_poll(void)
 555{
 556        unsigned long flags;
 557
 558        local_irq_save(flags);
 559        if (via1[IFR] & SR_INT) {
 560                via1[IFR] = SR_INT;
 561                pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 562        }
 563        if (via1[IFR] & CB1_INT) {
 564                via1[IFR] = CB1_INT;
 565                pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 566        }
 567        local_irq_restore(flags);
 568}
 569
 570static irqreturn_t
 571pmu_interrupt(int irq, void *dev_id)
 572{
 573        struct adb_request *req;
 574        int timeout, bite = 0;  /* to prevent compiler warning */
 575
 576#if 0
 577        printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 578                irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 579#endif
 580
 581        if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 582                adb_int_pending = 1;
 583        } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 584                if (via2[B] & TACK) {
 585                        printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 586                }
 587
 588                /* if reading grab the byte */
 589                if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 590
 591                /* reset TREQ and wait for TACK to go high */
 592                via2[B] |= TREQ;
 593                timeout = 3200;
 594                while (!(via2[B] & TACK)) {
 595                        if (--timeout < 0) {
 596                                printk(KERN_ERR "PMU not responding (!ack)\n");
 597                                goto finish;
 598                        }
 599                        udelay(10);
 600                }
 601
 602                switch (pmu_state) {
 603                case sending:
 604                        req = current_req;
 605                        if (data_len < 0) {
 606                                data_len = req->nbytes - 1;
 607                                send_byte(data_len);
 608                                break;
 609                        }
 610                        if (data_index <= data_len) {
 611                                send_byte(req->data[data_index++]);
 612                                break;
 613                        }
 614                        req->sent = 1;
 615                        data_len = pmu_data_len[req->data[0]][1];
 616                        if (data_len == 0) {
 617                                pmu_state = idle;
 618                                current_req = req->next;
 619                                if (req->reply_expected)
 620                                        req_awaiting_reply = req;
 621                                else
 622                                        pmu_done(req);
 623                        } else {
 624                                pmu_state = reading;
 625                                data_index = 0;
 626                                reply_ptr = req->reply + req->reply_len;
 627                                recv_byte();
 628                        }
 629                        break;
 630
 631                case intack:
 632                        data_index = 0;
 633                        data_len = -1;
 634                        pmu_state = reading_intr;
 635                        reply_ptr = interrupt_data;
 636                        recv_byte();
 637                        break;
 638
 639                case reading:
 640                case reading_intr:
 641                        if (data_len == -1) {
 642                                data_len = bite;
 643                                if (bite > 32)
 644                                        printk(KERN_ERR "PMU: bad reply len %d\n",
 645                                               bite);
 646                        } else {
 647                                reply_ptr[data_index++] = bite;
 648                        }
 649                        if (data_index < data_len) {
 650                                recv_byte();
 651                                break;
 652                        }
 653
 654                        if (pmu_state == reading_intr) {
 655                                pmu_handle_data(interrupt_data, data_index);
 656                        } else {
 657                                req = current_req;
 658                                current_req = req->next;
 659                                req->reply_len += data_index;
 660                                pmu_done(req);
 661                        }
 662                        pmu_state = idle;
 663
 664                        break;
 665
 666                default:
 667                        printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 668                               pmu_state);
 669                }
 670        }
 671finish:
 672        if (pmu_state == idle) {
 673                if (adb_int_pending) {
 674                        pmu_state = intack;
 675                        send_byte(PMU_INT_ACK);
 676                        adb_int_pending = 0;
 677                } else if (current_req) {
 678                        pmu_start();
 679                }
 680        }
 681
 682#if 0
 683        printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 684                pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 685#endif
 686        return IRQ_HANDLED;
 687}
 688
 689static void 
 690pmu_done(struct adb_request *req)
 691{
 692        req->complete = 1;
 693        if (req->done)
 694                (*req->done)(req);
 695}
 696
 697/* Interrupt data could be the result data from an ADB cmd */
 698static void 
 699pmu_handle_data(unsigned char *data, int len)
 700{
 701        static int show_pmu_ints = 1;
 702
 703        asleep = 0;
 704        if (len < 1) {
 705                adb_int_pending = 0;
 706                return;
 707        }
 708        if (data[0] & PMU_INT_ADB) {
 709                if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 710                        struct adb_request *req = req_awaiting_reply;
 711                        if (req == 0) {
 712                                printk(KERN_ERR "PMU: extra ADB reply\n");
 713                                return;
 714                        }
 715                        req_awaiting_reply = NULL;
 716                        if (len <= 2)
 717                                req->reply_len = 0;
 718                        else {
 719                                memcpy(req->reply, data + 1, len - 1);
 720                                req->reply_len = len - 1;
 721                        }
 722                        pmu_done(req);
 723                } else {
 724                        adb_input(data+1, len-1, 1);
 725                }
 726        } else {
 727                if (data[0] == 0x08 && len == 3) {
 728                        /* sound/brightness buttons pressed */
 729                        pmu_set_brightness(data[1] >> 3);
 730                        set_volume(data[2]);
 731                } else if (show_pmu_ints
 732                           && !(data[0] == PMU_INT_TICK && len == 1)) {
 733                        int i;
 734                        printk(KERN_DEBUG "pmu intr");
 735                        for (i = 0; i < len; ++i)
 736                                printk(" %.2x", data[i]);
 737                        printk("\n");
 738                }
 739        }
 740}
 741
 742static int backlight_level = -1;
 743static int backlight_enabled = 0;
 744
 745#define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 746
 747static void 
 748pmu_enable_backlight(int on)
 749{
 750        struct adb_request req;
 751
 752        if (on) {
 753            /* first call: get current backlight value */
 754            if (backlight_level < 0) {
 755                switch(pmu_kind) {
 756                    case PMU_68K_V1:
 757                    case PMU_68K_V2:
 758                        pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 759                        while (!req.complete)
 760                                pmu_poll();
 761                        printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 762                        backlight_level = req.reply[1];
 763                        break;
 764                    default:
 765                        backlight_enabled = 0;
 766                        return;
 767                }
 768            }
 769            pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 770                LEVEL_TO_BRIGHT(backlight_level));
 771            while (!req.complete)
 772                pmu_poll();
 773        }
 774        pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 775            PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 776        while (!req.complete)
 777                pmu_poll();
 778        backlight_enabled = on;
 779}
 780
 781static void 
 782pmu_set_brightness(int level)
 783{
 784        int bright;
 785
 786        backlight_level = level;
 787        bright = LEVEL_TO_BRIGHT(level);
 788        if (!backlight_enabled)
 789                return;
 790        if (bright_req_1.complete)
 791                pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 792                    bright);
 793        if (bright_req_2.complete)
 794                pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 795                    PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 796}
 797
 798void 
 799pmu_enable_irled(int on)
 800{
 801        struct adb_request req;
 802
 803        pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 804            (on ? PMU_POW_ON : PMU_POW_OFF));
 805        while (!req.complete)
 806                pmu_poll();
 807}
 808
 809static void 
 810set_volume(int level)
 811{
 812}
 813
 814int
 815pmu_present(void)
 816{
 817        return (pmu_kind != PMU_UNKNOWN);
 818}
 819