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/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
  78 static enum pmu_state {
  79         idle,
  80         sending,
  81         intack,
  82         reading,
  83         reading_intr,
  84 } pmu_state;
  85
  86 static struct adb_request *current_req;
  87 static struct adb_request *last_req;
  88 static struct adb_request *req_awaiting_reply;
  89 static unsigned char interrupt_data[32];
  90 static unsigned char *reply_ptr;
  91 static int data_index;
  92 static int data_len;
  93 static int adb_int_pending;
  94 static int pmu_adb_flags;
  95 static int adb_dev_map;
  96 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
  97 static int pmu_kind = PMU_UNKNOWN;
  98 static int pmu_fully_inited;
  99
 100 int asleep;
 101
 102 static int pmu_probe(void);
 103 static int pmu_init(void);
 104 static void pmu_start(void);
 105 static irqreturn_t pmu_interrupt(int irq, void *arg);
 106 static int pmu_send_request(struct adb_request *req, int sync);
 107 static int pmu_autopoll(int devs);
 108 void pmu_poll(void);
 109 static int pmu_reset_bus(void);
 110
 111 static void pmu_start(void);
 112 static void send_byte(int x);
 113 static void recv_byte(void);
 114 static void pmu_done(struct adb_request *req);
 115 static void pmu_handle_data(unsigned char *data, int len);
 116 static void set_volume(int level);
 117 static void pmu_enable_backlight(int on);
 118 static void pmu_set_brightness(int level);
 119
 120 struct 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  */
 137 static 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
 173 int 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
 188 static int
 189 pmu_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
 264 int
 265 pmu_get_model(void)
 266 {
 267         return pmu_kind;
 268 }
 269
 270 /* Send an ADB command */
 271 static int
 272 pmu_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 */
 379 static int
 380 pmu_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 */
 401 static int
 402 pmu_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 */
 446 int
 447 pmu_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
 473 int
 474 pmu_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
 508 static void
 509 send_byte(int x)
 510 {
 511         via1[ACR] |= SR_CTRL;
 512         via1[SR] = x;
 513         via2[B] &= ~TREQ;               /* assert TREQ */
 514 }
 515
 516 static void
 517 recv_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
 526 static void
 527 pmu_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
 547 out:
 548         local_irq_restore(flags);
 549 }
 550
 551 void
 552 pmu_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
 568 static irqreturn_t
 569 pmu_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         }
 669 finish:
 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
 687 static void
 688 pmu_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 */
 696 static void
 697 pmu_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
 740 static int backlight_level = -1;
 741 static int backlight_enabled = 0;
 742
 743 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 744
 745 static void
 746 pmu_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
 779 static void
 780 pmu_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
 796 void
 797 pmu_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
 807 static void
 808 set_volume(int level)
 809 {
 810 }
 811
 812 int
 813 pmu_present(void)
 814 {
 815         return (pmu_kind != PMU_UNKNOWN);
 816 }