linux/drivers/macintosh/via-pmu68k.c
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   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/init.h>
  29#include <linux/interrupt.h>
  30
  31#include <linux/adb.h>
  32#include <linux/pmu.h>
  33#include <linux/cuda.h>
  34
  35#include <asm/macintosh.h>
  36#include <asm/macints.h>
  37#include <asm/mac_via.h>
  38
  39#include <asm/pgtable.h>
  40#include <asm/irq.h>
  41#include <asm/uaccess.h>
  42
  43/* Misc minor number allocated for /dev/pmu */
  44#define PMU_MINOR       154
  45
  46/* VIA registers - spaced 0x200 bytes apart */
  47#define RS              0x200           /* skip between registers */
  48#define B               0               /* B-side data */
  49#define A               RS              /* A-side data */
  50#define DIRB            (2*RS)          /* B-side direction (1=output) */
  51#define DIRA            (3*RS)          /* A-side direction (1=output) */
  52#define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  53#define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  54#define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  55#define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  56#define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  57#define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  58#define SR              (10*RS)         /* Shift register */
  59#define ACR             (11*RS)         /* Auxiliary control register */
  60#define PCR             (12*RS)         /* Peripheral control register */
  61#define IFR             (13*RS)         /* Interrupt flag register */
  62#define IER             (14*RS)         /* Interrupt enable register */
  63#define ANH             (15*RS)         /* A-side data, no handshake */
  64
  65/* Bits in B data register: both active low */
  66#define TACK            0x02            /* Transfer acknowledge (input) */
  67#define TREQ            0x04            /* Transfer request (output) */
  68
  69/* Bits in ACR */
  70#define SR_CTRL         0x1c            /* Shift register control bits */
  71#define SR_EXT          0x0c            /* Shift on external clock */
  72#define SR_OUT          0x10            /* Shift out if 1 */
  73
  74/* Bits in IFR and IER */
  75#define SR_INT          0x04            /* Shift register full/empty */
  76#define CB1_INT         0x10            /* transition on CB1 input */
  77
  78static enum pmu_state {
  79        idle,
  80        sending,
  81        intack,
  82        reading,
  83        reading_intr,
  84} pmu_state;
  85
  86static struct adb_request *current_req;
  87static struct adb_request *last_req;
  88static struct adb_request *req_awaiting_reply;
  89static unsigned char interrupt_data[32];
  90static unsigned char *reply_ptr;
  91static int data_index;
  92static int data_len;
  93static int adb_int_pending;
  94static int pmu_adb_flags;
  95static int adb_dev_map;
  96static struct adb_request bright_req_1, bright_req_2, bright_req_3;
  97static int pmu_kind = PMU_UNKNOWN;
  98static int pmu_fully_inited;
  99
 100int asleep;
 101
 102static int pmu_probe(void);
 103static int pmu_init(void);
 104static void pmu_start(void);
 105static irqreturn_t pmu_interrupt(int irq, void *arg);
 106static int pmu_send_request(struct adb_request *req, int sync);
 107static int pmu_autopoll(int devs);
 108void pmu_poll(void);
 109static int pmu_reset_bus(void);
 110
 111static void pmu_start(void);
 112static void send_byte(int x);
 113static void recv_byte(void);
 114static void pmu_done(struct adb_request *req);
 115static void pmu_handle_data(unsigned char *data, int len);
 116static void set_volume(int level);
 117static void pmu_enable_backlight(int on);
 118static void pmu_set_brightness(int level);
 119
 120struct adb_driver via_pmu_driver = {
 121        "68K PMU",
 122        pmu_probe,
 123        pmu_init,
 124        pmu_send_request,
 125        pmu_autopoll,
 126        pmu_poll,
 127        pmu_reset_bus
 128};
 129
 130/*
 131 * This table indicates for each PMU opcode:
 132 * - the number of data bytes to be sent with the command, or -1
 133 *   if a length byte should be sent,
 134 * - the number of response bytes which the PMU will return, or
 135 *   -1 if it will send a length byte.
 136 */
 137static s8 pmu_data_len[256][2] = {
 138/*         0       1       2       3       4       5       6       7  */
 139/*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 140/*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 141/*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 142/*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 143/*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 144/*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 145/*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 146/*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 147/*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 148/*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 149/*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 150/*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 151/*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 152/*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 153/*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 154/*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 155/*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 156/*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 157/*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 158/*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 159/*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 160/*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 161/*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 162/*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 163/*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 164/*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 165/*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 166/*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 167/*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 168/*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 169/*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 170/*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 171};
 172
 173int pmu_probe(void)
 174{
 175        if (macintosh_config->adb_type == MAC_ADB_PB1) {
 176                pmu_kind = PMU_68K_V1;
 177        } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 178                pmu_kind = PMU_68K_V2;
 179        } else {
 180                return -ENODEV;
 181        }
 182
 183        pmu_state = idle;
 184
 185        return 0;
 186}
 187
 188static int 
 189pmu_init(void)
 190{
 191        int timeout;
 192        volatile struct adb_request req;
 193
 194        via2[B] |= TREQ;                                /* negate TREQ */
 195        via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 196
 197        pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 198        timeout =  100000;
 199        while (!req.complete) {
 200                if (--timeout < 0) {
 201                        printk(KERN_ERR "pmu_init: no response from PMU\n");
 202                        return -EAGAIN;
 203                }
 204                udelay(10);
 205                pmu_poll();
 206        }
 207
 208        /* ack all pending interrupts */
 209        timeout = 100000;
 210        interrupt_data[0] = 1;
 211        while (interrupt_data[0] || pmu_state != idle) {
 212                if (--timeout < 0) {
 213                        printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 214                        return -EAGAIN;
 215                }
 216                if (pmu_state == idle) {
 217                        adb_int_pending = 1;
 218                        pmu_interrupt(0, NULL);
 219                }
 220                pmu_poll();
 221                udelay(10);
 222        }
 223
 224        pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 225                        PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 226        timeout =  100000;
 227        while (!req.complete) {
 228                if (--timeout < 0) {
 229                        printk(KERN_ERR "pmu_init: no response from PMU\n");
 230                        return -EAGAIN;
 231                }
 232                udelay(10);
 233                pmu_poll();
 234        }
 235
 236        bright_req_1.complete = 1;
 237        bright_req_2.complete = 1;
 238        bright_req_3.complete = 1;
 239
 240        if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 241                        pmu_interrupt)) {
 242                printk(KERN_ERR "pmu_init: can't get irq %d\n",
 243                        IRQ_MAC_ADB_SR);
 244                return -EAGAIN;
 245        }
 246        if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 247                        pmu_interrupt)) {
 248                printk(KERN_ERR "pmu_init: can't get irq %d\n",
 249                        IRQ_MAC_ADB_CL);
 250                free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 251                return -EAGAIN;
 252        }
 253
 254        pmu_fully_inited = 1;
 255        
 256        /* Enable backlight */
 257        pmu_enable_backlight(1);
 258
 259        printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 260
 261        return 0;
 262}
 263
 264int
 265pmu_get_model(void)
 266{
 267        return pmu_kind;
 268}
 269
 270/* Send an ADB command */
 271static int 
 272pmu_send_request(struct adb_request *req, int sync)
 273{
 274    int i, ret;
 275
 276    if (!pmu_fully_inited)
 277    {
 278        req->complete = 1;
 279        return -ENXIO;
 280   }
 281
 282    ret = -EINVAL;
 283        
 284    switch (req->data[0]) {
 285    case PMU_PACKET:
 286                for (i = 0; i < req->nbytes - 1; ++i)
 287                        req->data[i] = req->data[i+1];
 288                --req->nbytes;
 289                if (pmu_data_len[req->data[0]][1] != 0) {
 290                        req->reply[0] = ADB_RET_OK;
 291                        req->reply_len = 1;
 292                } else
 293                        req->reply_len = 0;
 294                ret = pmu_queue_request(req);
 295                break;
 296    case CUDA_PACKET:
 297                switch (req->data[1]) {
 298                case CUDA_GET_TIME:
 299                        if (req->nbytes != 2)
 300                                break;
 301                        req->data[0] = PMU_READ_RTC;
 302                        req->nbytes = 1;
 303                        req->reply_len = 3;
 304                        req->reply[0] = CUDA_PACKET;
 305                        req->reply[1] = 0;
 306                        req->reply[2] = CUDA_GET_TIME;
 307                        ret = pmu_queue_request(req);
 308                        break;
 309                case CUDA_SET_TIME:
 310                        if (req->nbytes != 6)
 311                                break;
 312                        req->data[0] = PMU_SET_RTC;
 313                        req->nbytes = 5;
 314                        for (i = 1; i <= 4; ++i)
 315                                req->data[i] = req->data[i+1];
 316                        req->reply_len = 3;
 317                        req->reply[0] = CUDA_PACKET;
 318                        req->reply[1] = 0;
 319                        req->reply[2] = CUDA_SET_TIME;
 320                        ret = pmu_queue_request(req);
 321                        break;
 322                case CUDA_GET_PRAM:
 323                        if (req->nbytes != 4)
 324                                break;
 325                        req->data[0] = PMU_READ_NVRAM;
 326                        req->data[1] = req->data[2];
 327                        req->data[2] = req->data[3];
 328                        req->nbytes = 3;
 329                        req->reply_len = 3;
 330                        req->reply[0] = CUDA_PACKET;
 331                        req->reply[1] = 0;
 332                        req->reply[2] = CUDA_GET_PRAM;
 333                        ret = pmu_queue_request(req);
 334                        break;
 335                case CUDA_SET_PRAM:
 336                        if (req->nbytes != 5)
 337                                break;
 338                        req->data[0] = PMU_WRITE_NVRAM;
 339                        req->data[1] = req->data[2];
 340                        req->data[2] = req->data[3];
 341                        req->data[3] = req->data[4];
 342                        req->nbytes = 4;
 343                        req->reply_len = 3;
 344                        req->reply[0] = CUDA_PACKET;
 345                        req->reply[1] = 0;
 346                        req->reply[2] = CUDA_SET_PRAM;
 347                        ret = pmu_queue_request(req);
 348                        break;
 349                }
 350                break;
 351    case ADB_PACKET:
 352                for (i = req->nbytes - 1; i > 1; --i)
 353                        req->data[i+2] = req->data[i];
 354                req->data[3] = req->nbytes - 2;
 355                req->data[2] = pmu_adb_flags;
 356                /*req->data[1] = req->data[1];*/
 357                req->data[0] = PMU_ADB_CMD;
 358                req->nbytes += 2;
 359                req->reply_expected = 1;
 360                req->reply_len = 0;
 361                ret = pmu_queue_request(req);
 362                break;
 363    }
 364    if (ret)
 365    {
 366        req->complete = 1;
 367        return ret;
 368    }
 369        
 370    if (sync) {
 371        while (!req->complete)
 372                pmu_poll();
 373    }
 374
 375    return 0;
 376}
 377
 378/* Enable/disable autopolling */
 379static int 
 380pmu_autopoll(int devs)
 381{
 382        struct adb_request req;
 383
 384        if (!pmu_fully_inited) return -ENXIO;
 385
 386        if (devs) {
 387                adb_dev_map = devs;
 388                pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 389                            adb_dev_map >> 8, adb_dev_map);
 390                pmu_adb_flags = 2;
 391        } else {
 392                pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 393                pmu_adb_flags = 0;
 394        }
 395        while (!req.complete)
 396                pmu_poll();
 397        return 0;
 398}
 399
 400/* Reset the ADB bus */
 401static int 
 402pmu_reset_bus(void)
 403{
 404        struct adb_request req;
 405        long timeout;
 406        int save_autopoll = adb_dev_map;
 407
 408        if (!pmu_fully_inited) return -ENXIO;
 409
 410        /* anyone got a better idea?? */
 411        pmu_autopoll(0);
 412
 413        req.nbytes = 5;
 414        req.done = NULL;
 415        req.data[0] = PMU_ADB_CMD;
 416        req.data[1] = 0;
 417        req.data[2] = 3; /* ADB_BUSRESET ??? */
 418        req.data[3] = 0;
 419        req.data[4] = 0;
 420        req.reply_len = 0;
 421        req.reply_expected = 1;
 422        if (pmu_queue_request(&req) != 0)
 423        {
 424                printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 425                return -EIO;
 426        }
 427        while (!req.complete)
 428                pmu_poll();
 429        timeout = 100000;
 430        while (!req.complete) {
 431                if (--timeout < 0) {
 432                        printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 433                        return -EIO;
 434                }
 435                udelay(10);
 436                pmu_poll();
 437        }
 438
 439        if (save_autopoll != 0)
 440                pmu_autopoll(save_autopoll);
 441                
 442        return 0;
 443}
 444
 445/* Construct and send a pmu request */
 446int 
 447pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 448            int nbytes, ...)
 449{
 450        va_list list;
 451        int i;
 452
 453        if (nbytes < 0 || nbytes > 32) {
 454                printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 455                req->complete = 1;
 456                return -EINVAL;
 457        }
 458        req->nbytes = nbytes;
 459        req->done = done;
 460        va_start(list, nbytes);
 461        for (i = 0; i < nbytes; ++i)
 462                req->data[i] = va_arg(list, int);
 463        va_end(list);
 464        if (pmu_data_len[req->data[0]][1] != 0) {
 465                req->reply[0] = ADB_RET_OK;
 466                req->reply_len = 1;
 467        } else
 468                req->reply_len = 0;
 469        req->reply_expected = 0;
 470        return pmu_queue_request(req);
 471}
 472
 473int
 474pmu_queue_request(struct adb_request *req)
 475{
 476        unsigned long flags;
 477        int nsend;
 478
 479        if (req->nbytes <= 0) {
 480                req->complete = 1;
 481                return 0;
 482        }
 483        nsend = pmu_data_len[req->data[0]][0];
 484        if (nsend >= 0 && req->nbytes != nsend + 1) {
 485                req->complete = 1;
 486                return -EINVAL;
 487        }
 488
 489        req->next = NULL;
 490        req->sent = 0;
 491        req->complete = 0;
 492        local_irq_save(flags);
 493
 494        if (current_req != 0) {
 495                last_req->next = req;
 496                last_req = req;
 497        } else {
 498                current_req = req;
 499                last_req = req;
 500                if (pmu_state == idle)
 501                        pmu_start();
 502        }
 503
 504        local_irq_restore(flags);
 505        return 0;
 506}
 507
 508static void 
 509send_byte(int x)
 510{
 511        via1[ACR] |= SR_CTRL;
 512        via1[SR] = x;
 513        via2[B] &= ~TREQ;               /* assert TREQ */
 514}
 515
 516static void 
 517recv_byte(void)
 518{
 519        char c;
 520
 521        via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 522        c = via1[SR];           /* resets SR */
 523        via2[B] &= ~TREQ;
 524}
 525
 526static void 
 527pmu_start(void)
 528{
 529        unsigned long flags;
 530        struct adb_request *req;
 531
 532        /* assert pmu_state == idle */
 533        /* get the packet to send */
 534        local_irq_save(flags);
 535        req = current_req;
 536        if (req == 0 || pmu_state != idle
 537            || (req->reply_expected && req_awaiting_reply))
 538                goto out;
 539
 540        pmu_state = sending;
 541        data_index = 1;
 542        data_len = pmu_data_len[req->data[0]][0];
 543
 544        /* set the shift register to shift out and send a byte */
 545        send_byte(req->data[0]);
 546
 547out:
 548        local_irq_restore(flags);
 549}
 550
 551void 
 552pmu_poll(void)
 553{
 554        unsigned long flags;
 555
 556        local_irq_save(flags);
 557        if (via1[IFR] & SR_INT) {
 558                via1[IFR] = SR_INT;
 559                pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 560        }
 561        if (via1[IFR] & CB1_INT) {
 562                via1[IFR] = CB1_INT;
 563                pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 564        }
 565        local_irq_restore(flags);
 566}
 567
 568static irqreturn_t
 569pmu_interrupt(int irq, void *dev_id)
 570{
 571        struct adb_request *req;
 572        int timeout, bite = 0;  /* to prevent compiler warning */
 573
 574#if 0
 575        printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 576                irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 577#endif
 578
 579        if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 580                adb_int_pending = 1;
 581        } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 582                if (via2[B] & TACK) {
 583                        printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 584                }
 585
 586                /* if reading grab the byte */
 587                if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 588
 589                /* reset TREQ and wait for TACK to go high */
 590                via2[B] |= TREQ;
 591                timeout = 3200;
 592                while (!(via2[B] & TACK)) {
 593                        if (--timeout < 0) {
 594                                printk(KERN_ERR "PMU not responding (!ack)\n");
 595                                goto finish;
 596                        }
 597                        udelay(10);
 598                }
 599
 600                switch (pmu_state) {
 601                case sending:
 602                        req = current_req;
 603                        if (data_len < 0) {
 604                                data_len = req->nbytes - 1;
 605                                send_byte(data_len);
 606                                break;
 607                        }
 608                        if (data_index <= data_len) {
 609                                send_byte(req->data[data_index++]);
 610                                break;
 611                        }
 612                        req->sent = 1;
 613                        data_len = pmu_data_len[req->data[0]][1];
 614                        if (data_len == 0) {
 615                                pmu_state = idle;
 616                                current_req = req->next;
 617                                if (req->reply_expected)
 618                                        req_awaiting_reply = req;
 619                                else
 620                                        pmu_done(req);
 621                        } else {
 622                                pmu_state = reading;
 623                                data_index = 0;
 624                                reply_ptr = req->reply + req->reply_len;
 625                                recv_byte();
 626                        }
 627                        break;
 628
 629                case intack:
 630                        data_index = 0;
 631                        data_len = -1;
 632                        pmu_state = reading_intr;
 633                        reply_ptr = interrupt_data;
 634                        recv_byte();
 635                        break;
 636
 637                case reading:
 638                case reading_intr:
 639                        if (data_len == -1) {
 640                                data_len = bite;
 641                                if (bite > 32)
 642                                        printk(KERN_ERR "PMU: bad reply len %d\n",
 643                                               bite);
 644                        } else {
 645                                reply_ptr[data_index++] = bite;
 646                        }
 647                        if (data_index < data_len) {
 648                                recv_byte();
 649                                break;
 650                        }
 651
 652                        if (pmu_state == reading_intr) {
 653                                pmu_handle_data(interrupt_data, data_index);
 654                        } else {
 655                                req = current_req;
 656                                current_req = req->next;
 657                                req->reply_len += data_index;
 658                                pmu_done(req);
 659                        }
 660                        pmu_state = idle;
 661
 662                        break;
 663
 664                default:
 665                        printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 666                               pmu_state);
 667                }
 668        }
 669finish:
 670        if (pmu_state == idle) {
 671                if (adb_int_pending) {
 672                        pmu_state = intack;
 673                        send_byte(PMU_INT_ACK);
 674                        adb_int_pending = 0;
 675                } else if (current_req) {
 676                        pmu_start();
 677                }
 678        }
 679
 680#if 0
 681        printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 682                pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 683#endif
 684        return IRQ_HANDLED;
 685}
 686
 687static void 
 688pmu_done(struct adb_request *req)
 689{
 690        req->complete = 1;
 691        if (req->done)
 692                (*req->done)(req);
 693}
 694
 695/* Interrupt data could be the result data from an ADB cmd */
 696static void 
 697pmu_handle_data(unsigned char *data, int len)
 698{
 699        static int show_pmu_ints = 1;
 700
 701        asleep = 0;
 702        if (len < 1) {
 703                adb_int_pending = 0;
 704                return;
 705        }
 706        if (data[0] & PMU_INT_ADB) {
 707                if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 708                        struct adb_request *req = req_awaiting_reply;
 709                        if (req == 0) {
 710                                printk(KERN_ERR "PMU: extra ADB reply\n");
 711                                return;
 712                        }
 713                        req_awaiting_reply = NULL;
 714                        if (len <= 2)
 715                                req->reply_len = 0;
 716                        else {
 717                                memcpy(req->reply, data + 1, len - 1);
 718                                req->reply_len = len - 1;
 719                        }
 720                        pmu_done(req);
 721                } else {
 722                        adb_input(data+1, len-1, 1);
 723                }
 724        } else {
 725                if (data[0] == 0x08 && len == 3) {
 726                        /* sound/brightness buttons pressed */
 727                        pmu_set_brightness(data[1] >> 3);
 728                        set_volume(data[2]);
 729                } else if (show_pmu_ints
 730                           && !(data[0] == PMU_INT_TICK && len == 1)) {
 731                        int i;
 732                        printk(KERN_DEBUG "pmu intr");
 733                        for (i = 0; i < len; ++i)
 734                                printk(" %.2x", data[i]);
 735                        printk("\n");
 736                }
 737        }
 738}
 739
 740static int backlight_level = -1;
 741static int backlight_enabled = 0;
 742
 743#define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 744
 745static void 
 746pmu_enable_backlight(int on)
 747{
 748        struct adb_request req;
 749
 750        if (on) {
 751            /* first call: get current backlight value */
 752            if (backlight_level < 0) {
 753                switch(pmu_kind) {
 754                    case PMU_68K_V1:
 755                    case PMU_68K_V2:
 756                        pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 757                        while (!req.complete)
 758                                pmu_poll();
 759                        printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 760                        backlight_level = req.reply[1];
 761                        break;
 762                    default:
 763                        backlight_enabled = 0;
 764                        return;
 765                }
 766            }
 767            pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 768                LEVEL_TO_BRIGHT(backlight_level));
 769            while (!req.complete)
 770                pmu_poll();
 771        }
 772        pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 773            PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 774        while (!req.complete)
 775                pmu_poll();
 776        backlight_enabled = on;
 777}
 778
 779static void 
 780pmu_set_brightness(int level)
 781{
 782        int bright;
 783
 784        backlight_level = level;
 785        bright = LEVEL_TO_BRIGHT(level);
 786        if (!backlight_enabled)
 787                return;
 788        if (bright_req_1.complete)
 789                pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 790                    bright);
 791        if (bright_req_2.complete)
 792                pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 793                    PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 794}
 795
 796void 
 797pmu_enable_irled(int on)
 798{
 799        struct adb_request req;
 800
 801        pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 802            (on ? PMU_POW_ON : PMU_POW_OFF));
 803        while (!req.complete)
 804                pmu_poll();
 805}
 806
 807static void 
 808set_volume(int level)
 809{
 810}
 811
 812int
 813pmu_present(void)
 814{
 815        return (pmu_kind != PMU_UNKNOWN);
 816}
 817
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