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/machw.h>
  39 #include <asm/mac_via.h>
  40
  41 #include <asm/pgtable.h>
  42 #include <asm/system.h>
  43 #include <asm/irq.h>
  44 #include <asm/uaccess.h>
  45
  46 /* Misc minor number allocated for /dev/pmu */
  47 #define PMU_MINOR       154
  48
  49 /* VIA registers - spaced 0x200 bytes apart */
  50 #define RS              0x200           /* skip between registers */
  51 #define B               0               /* B-side data */
  52 #define A               RS              /* A-side data */
  53 #define DIRB            (2*RS)          /* B-side direction (1=output) */
  54 #define DIRA            (3*RS)          /* A-side direction (1=output) */
  55 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
  56 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
  57 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
  58 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
  59 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
  60 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
  61 #define SR              (10*RS)         /* Shift register */
  62 #define ACR             (11*RS)         /* Auxiliary control register */
  63 #define PCR             (12*RS)         /* Peripheral control register */
  64 #define IFR             (13*RS)         /* Interrupt flag register */
  65 #define IER             (14*RS)         /* Interrupt enable register */
  66 #define ANH             (15*RS)         /* A-side data, no handshake */
  67
  68 /* Bits in B data register: both active low */
  69 #define TACK            0x02            /* Transfer acknowledge (input) */
  70 #define TREQ            0x04            /* Transfer request (output) */
  71
  72 /* Bits in ACR */
  73 #define SR_CTRL         0x1c            /* Shift register control bits */
  74 #define SR_EXT          0x0c            /* Shift on external clock */
  75 #define SR_OUT          0x10            /* Shift out if 1 */
  76
  77 /* Bits in IFR and IER */
  78 #define SR_INT          0x04            /* Shift register full/empty */
  79 #define CB1_INT         0x10            /* transition on CB1 input */
  80
  81 static enum pmu_state {
  82         idle,
  83         sending,
  84         intack,
  85         reading,
  86         reading_intr,
  87 } pmu_state;
  88
  89 static struct adb_request *current_req;
  90 static struct adb_request *last_req;
  91 static struct adb_request *req_awaiting_reply;
  92 static unsigned char interrupt_data[32];
  93 static unsigned char *reply_ptr;
  94 static int data_index;
  95 static int data_len;
  96 static int adb_int_pending;
  97 static int pmu_adb_flags;
  98 static int adb_dev_map;
  99 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
 100 static int pmu_kind = PMU_UNKNOWN;
 101 static int pmu_fully_inited;
 102
 103 int asleep;
 104 BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
 105
 106 static int pmu_probe(void);
 107 static int pmu_init(void);
 108 static void pmu_start(void);
 109 static irqreturn_t pmu_interrupt(int irq, void *arg);
 110 static int pmu_send_request(struct adb_request *req, int sync);
 111 static int pmu_autopoll(int devs);
 112 void pmu_poll(void);
 113 static int pmu_reset_bus(void);
 114
 115 static void pmu_start(void);
 116 static void send_byte(int x);
 117 static void recv_byte(void);
 118 static void pmu_done(struct adb_request *req);
 119 static void pmu_handle_data(unsigned char *data, int len);
 120 static void set_volume(int level);
 121 static void pmu_enable_backlight(int on);
 122 static void pmu_set_brightness(int level);
 123
 124 struct adb_driver via_pmu_driver = {
 125         "68K PMU",
 126         pmu_probe,
 127         pmu_init,
 128         pmu_send_request,
 129         pmu_autopoll,
 130         pmu_poll,
 131         pmu_reset_bus
 132 };
 133
 134 /*
 135  * This table indicates for each PMU opcode:
 136  * - the number of data bytes to be sent with the command, or -1
 137  *   if a length byte should be sent,
 138  * - the number of response bytes which the PMU will return, or
 139  *   -1 if it will send a length byte.
 140  */
 141 static s8 pmu_data_len[256][2] = {
 142 /*         0       1       2       3       4       5       6       7  */
 143 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 144 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 145 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 146 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
 147 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
 148 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
 149 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 150 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
 151 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 152 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
 153 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
 154 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
 155 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 156 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
 157 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 158 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
 159 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 160 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 161 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 162 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 163 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
 164 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 165 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 166 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 167 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 168 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 169 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 170 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
 171 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
 172 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
 173 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
 174 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
 175 };
 176
 177 int pmu_probe(void)
 178 {
 179         if (macintosh_config->adb_type == MAC_ADB_PB1) {
 180                 pmu_kind = PMU_68K_V1;
 181         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 182                 pmu_kind = PMU_68K_V2;
 183         } else {
 184                 return -ENODEV;
 185         }
 186
 187         pmu_state = idle;
 188
 189         return 0;
 190 }
 191
 192 static int
 193 pmu_init(void)
 194 {
 195         int timeout;
 196         volatile struct adb_request req;
 197
 198         via2[B] |= TREQ;                                /* negate TREQ */
 199         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
 200
 201         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
 202         timeout =  100000;
 203         while (!req.complete) {
 204                 if (--timeout < 0) {
 205                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 206                         return -EAGAIN;
 207                 }
 208                 udelay(10);
 209                 pmu_poll();
 210         }
 211
 212         /* ack all pending interrupts */
 213         timeout = 100000;
 214         interrupt_data[0] = 1;
 215         while (interrupt_data[0] || pmu_state != idle) {
 216                 if (--timeout < 0) {
 217                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
 218                         return -EAGAIN;
 219                 }
 220                 if (pmu_state == idle) {
 221                         adb_int_pending = 1;
 222                         pmu_interrupt(0, NULL);
 223                 }
 224                 pmu_poll();
 225                 udelay(10);
 226         }
 227
 228         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
 229                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
 230         timeout =  100000;
 231         while (!req.complete) {
 232                 if (--timeout < 0) {
 233                         printk(KERN_ERR "pmu_init: no response from PMU\n");
 234                         return -EAGAIN;
 235                 }
 236                 udelay(10);
 237                 pmu_poll();
 238         }
 239
 240         bright_req_1.complete = 1;
 241         bright_req_2.complete = 1;
 242         bright_req_3.complete = 1;
 243
 244         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
 245                         pmu_interrupt)) {
 246                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 247                         IRQ_MAC_ADB_SR);
 248                 return -EAGAIN;
 249         }
 250         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
 251                         pmu_interrupt)) {
 252                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
 253                         IRQ_MAC_ADB_CL);
 254                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
 255                 return -EAGAIN;
 256         }
 257
 258         pmu_fully_inited = 1;
 259
 260         /* Enable backlight */
 261         pmu_enable_backlight(1);
 262
 263         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
 264
 265         return 0;
 266 }
 267
 268 int
 269 pmu_get_model(void)
 270 {
 271         return pmu_kind;
 272 }
 273
 274 /* Send an ADB command */
 275 static int
 276 pmu_send_request(struct adb_request *req, int sync)
 277 {
 278     int i, ret;
 279
 280     if (!pmu_fully_inited)
 281     {
 282         req->complete = 1;
 283         return -ENXIO;
 284    }
 285
 286     ret = -EINVAL;
 287
 288     switch (req->data[0]) {
 289     case PMU_PACKET:
 290                 for (i = 0; i < req->nbytes - 1; ++i)
 291                         req->data[i] = req->data[i+1];
 292                 --req->nbytes;
 293                 if (pmu_data_len[req->data[0]][1] != 0) {
 294                         req->reply[0] = ADB_RET_OK;
 295                         req->reply_len = 1;
 296                 } else
 297                         req->reply_len = 0;
 298                 ret = pmu_queue_request(req);
 299                 break;
 300     case CUDA_PACKET:
 301                 switch (req->data[1]) {
 302                 case CUDA_GET_TIME:
 303                         if (req->nbytes != 2)
 304                                 break;
 305                         req->data[0] = PMU_READ_RTC;
 306                         req->nbytes = 1;
 307                         req->reply_len = 3;
 308                         req->reply[0] = CUDA_PACKET;
 309                         req->reply[1] = 0;
 310                         req->reply[2] = CUDA_GET_TIME;
 311                         ret = pmu_queue_request(req);
 312                         break;
 313                 case CUDA_SET_TIME:
 314                         if (req->nbytes != 6)
 315                                 break;
 316                         req->data[0] = PMU_SET_RTC;
 317                         req->nbytes = 5;
 318                         for (i = 1; i <= 4; ++i)
 319                                 req->data[i] = req->data[i+1];
 320                         req->reply_len = 3;
 321                         req->reply[0] = CUDA_PACKET;
 322                         req->reply[1] = 0;
 323                         req->reply[2] = CUDA_SET_TIME;
 324                         ret = pmu_queue_request(req);
 325                         break;
 326                 case CUDA_GET_PRAM:
 327                         if (req->nbytes != 4)
 328                                 break;
 329                         req->data[0] = PMU_READ_NVRAM;
 330                         req->data[1] = req->data[2];
 331                         req->data[2] = req->data[3];
 332                         req->nbytes = 3;
 333                         req->reply_len = 3;
 334                         req->reply[0] = CUDA_PACKET;
 335                         req->reply[1] = 0;
 336                         req->reply[2] = CUDA_GET_PRAM;
 337                         ret = pmu_queue_request(req);
 338                         break;
 339                 case CUDA_SET_PRAM:
 340                         if (req->nbytes != 5)
 341                                 break;
 342                         req->data[0] = PMU_WRITE_NVRAM;
 343                         req->data[1] = req->data[2];
 344                         req->data[2] = req->data[3];
 345                         req->data[3] = req->data[4];
 346                         req->nbytes = 4;
 347                         req->reply_len = 3;
 348                         req->reply[0] = CUDA_PACKET;
 349                         req->reply[1] = 0;
 350                         req->reply[2] = CUDA_SET_PRAM;
 351                         ret = pmu_queue_request(req);
 352                         break;
 353                 }
 354                 break;
 355     case ADB_PACKET:
 356                 for (i = req->nbytes - 1; i > 1; --i)
 357                         req->data[i+2] = req->data[i];
 358                 req->data[3] = req->nbytes - 2;
 359                 req->data[2] = pmu_adb_flags;
 360                 /*req->data[1] = req->data[1];*/
 361                 req->data[0] = PMU_ADB_CMD;
 362                 req->nbytes += 2;
 363                 req->reply_expected = 1;
 364                 req->reply_len = 0;
 365                 ret = pmu_queue_request(req);
 366                 break;
 367     }
 368     if (ret)
 369     {
 370         req->complete = 1;
 371         return ret;
 372     }
 373
 374     if (sync) {
 375         while (!req->complete)
 376                 pmu_poll();
 377     }
 378
 379     return 0;
 380 }
 381
 382 /* Enable/disable autopolling */
 383 static int
 384 pmu_autopoll(int devs)
 385 {
 386         struct adb_request req;
 387
 388         if (!pmu_fully_inited) return -ENXIO;
 389
 390         if (devs) {
 391                 adb_dev_map = devs;
 392                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
 393                             adb_dev_map >> 8, adb_dev_map);
 394                 pmu_adb_flags = 2;
 395         } else {
 396                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
 397                 pmu_adb_flags = 0;
 398         }
 399         while (!req.complete)
 400                 pmu_poll();
 401         return 0;
 402 }
 403
 404 /* Reset the ADB bus */
 405 static int
 406 pmu_reset_bus(void)
 407 {
 408         struct adb_request req;
 409         long timeout;
 410         int save_autopoll = adb_dev_map;
 411
 412         if (!pmu_fully_inited) return -ENXIO;
 413
 414         /* anyone got a better idea?? */
 415         pmu_autopoll(0);
 416
 417         req.nbytes = 5;
 418         req.done = NULL;
 419         req.data[0] = PMU_ADB_CMD;
 420         req.data[1] = 0;
 421         req.data[2] = 3; /* ADB_BUSRESET ??? */
 422         req.data[3] = 0;
 423         req.data[4] = 0;
 424         req.reply_len = 0;
 425         req.reply_expected = 1;
 426         if (pmu_queue_request(&req) != 0)
 427         {
 428                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
 429                 return -EIO;
 430         }
 431         while (!req.complete)
 432                 pmu_poll();
 433         timeout = 100000;
 434         while (!req.complete) {
 435                 if (--timeout < 0) {
 436                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
 437                         return -EIO;
 438                 }
 439                 udelay(10);
 440                 pmu_poll();
 441         }
 442
 443         if (save_autopoll != 0)
 444                 pmu_autopoll(save_autopoll);
 445
 446         return 0;
 447 }
 448
 449 /* Construct and send a pmu request */
 450 int
 451 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
 452             int nbytes, ...)
 453 {
 454         va_list list;
 455         int i;
 456
 457         if (nbytes < 0 || nbytes > 32) {
 458                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
 459                 req->complete = 1;
 460                 return -EINVAL;
 461         }
 462         req->nbytes = nbytes;
 463         req->done = done;
 464         va_start(list, nbytes);
 465         for (i = 0; i < nbytes; ++i)
 466                 req->data[i] = va_arg(list, int);
 467         va_end(list);
 468         if (pmu_data_len[req->data[0]][1] != 0) {
 469                 req->reply[0] = ADB_RET_OK;
 470                 req->reply_len = 1;
 471         } else
 472                 req->reply_len = 0;
 473         req->reply_expected = 0;
 474         return pmu_queue_request(req);
 475 }
 476
 477 int
 478 pmu_queue_request(struct adb_request *req)
 479 {
 480         unsigned long flags;
 481         int nsend;
 482
 483         if (req->nbytes <= 0) {
 484                 req->complete = 1;
 485                 return 0;
 486         }
 487         nsend = pmu_data_len[req->data[0]][0];
 488         if (nsend >= 0 && req->nbytes != nsend + 1) {
 489                 req->complete = 1;
 490                 return -EINVAL;
 491         }
 492
 493         req->next = NULL;
 494         req->sent = 0;
 495         req->complete = 0;
 496         local_irq_save(flags);
 497
 498         if (current_req != 0) {
 499                 last_req->next = req;
 500                 last_req = req;
 501         } else {
 502                 current_req = req;
 503                 last_req = req;
 504                 if (pmu_state == idle)
 505                         pmu_start();
 506         }
 507
 508         local_irq_restore(flags);
 509         return 0;
 510 }
 511
 512 static void
 513 send_byte(int x)
 514 {
 515         via1[ACR] |= SR_CTRL;
 516         via1[SR] = x;
 517         via2[B] &= ~TREQ;               /* assert TREQ */
 518 }
 519
 520 static void
 521 recv_byte(void)
 522 {
 523         char c;
 524
 525         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
 526         c = via1[SR];           /* resets SR */
 527         via2[B] &= ~TREQ;
 528 }
 529
 530 static void
 531 pmu_start(void)
 532 {
 533         unsigned long flags;
 534         struct adb_request *req;
 535
 536         /* assert pmu_state == idle */
 537         /* get the packet to send */
 538         local_irq_save(flags);
 539         req = current_req;
 540         if (req == 0 || pmu_state != idle
 541             || (req->reply_expected && req_awaiting_reply))
 542                 goto out;
 543
 544         pmu_state = sending;
 545         data_index = 1;
 546         data_len = pmu_data_len[req->data[0]][0];
 547
 548         /* set the shift register to shift out and send a byte */
 549         send_byte(req->data[0]);
 550
 551 out:
 552         local_irq_restore(flags);
 553 }
 554
 555 void
 556 pmu_poll(void)
 557 {
 558         unsigned long flags;
 559
 560         local_irq_save(flags);
 561         if (via1[IFR] & SR_INT) {
 562                 via1[IFR] = SR_INT;
 563                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
 564         }
 565         if (via1[IFR] & CB1_INT) {
 566                 via1[IFR] = CB1_INT;
 567                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
 568         }
 569         local_irq_restore(flags);
 570 }
 571
 572 static irqreturn_t
 573 pmu_interrupt(int irq, void *dev_id)
 574 {
 575         struct adb_request *req;
 576         int timeout, bite = 0;  /* to prevent compiler warning */
 577
 578 #if 0
 579         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 580                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 581 #endif
 582
 583         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
 584                 adb_int_pending = 1;
 585         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
 586                 if (via2[B] & TACK) {
 587                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
 588                 }
 589
 590                 /* if reading grab the byte */
 591                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
 592
 593                 /* reset TREQ and wait for TACK to go high */
 594                 via2[B] |= TREQ;
 595                 timeout = 3200;
 596                 while (!(via2[B] & TACK)) {
 597                         if (--timeout < 0) {
 598                                 printk(KERN_ERR "PMU not responding (!ack)\n");
 599                                 goto finish;
 600                         }
 601                         udelay(10);
 602                 }
 603
 604                 switch (pmu_state) {
 605                 case sending:
 606                         req = current_req;
 607                         if (data_len < 0) {
 608                                 data_len = req->nbytes - 1;
 609                                 send_byte(data_len);
 610                                 break;
 611                         }
 612                         if (data_index <= data_len) {
 613                                 send_byte(req->data[data_index++]);
 614                                 break;
 615                         }
 616                         req->sent = 1;
 617                         data_len = pmu_data_len[req->data[0]][1];
 618                         if (data_len == 0) {
 619                                 pmu_state = idle;
 620                                 current_req = req->next;
 621                                 if (req->reply_expected)
 622                                         req_awaiting_reply = req;
 623                                 else
 624                                         pmu_done(req);
 625                         } else {
 626                                 pmu_state = reading;
 627                                 data_index = 0;
 628                                 reply_ptr = req->reply + req->reply_len;
 629                                 recv_byte();
 630                         }
 631                         break;
 632
 633                 case intack:
 634                         data_index = 0;
 635                         data_len = -1;
 636                         pmu_state = reading_intr;
 637                         reply_ptr = interrupt_data;
 638                         recv_byte();
 639                         break;
 640
 641                 case reading:
 642                 case reading_intr:
 643                         if (data_len == -1) {
 644                                 data_len = bite;
 645                                 if (bite > 32)
 646                                         printk(KERN_ERR "PMU: bad reply len %d\n",
 647                                                bite);
 648                         } else {
 649                                 reply_ptr[data_index++] = bite;
 650                         }
 651                         if (data_index < data_len) {
 652                                 recv_byte();
 653                                 break;
 654                         }
 655
 656                         if (pmu_state == reading_intr) {
 657                                 pmu_handle_data(interrupt_data, data_index);
 658                         } else {
 659                                 req = current_req;
 660                                 current_req = req->next;
 661                                 req->reply_len += data_index;
 662                                 pmu_done(req);
 663                         }
 664                         pmu_state = idle;
 665
 666                         break;
 667
 668                 default:
 669                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
 670                                pmu_state);
 671                 }
 672         }
 673 finish:
 674         if (pmu_state == idle) {
 675                 if (adb_int_pending) {
 676                         pmu_state = intack;
 677                         send_byte(PMU_INT_ACK);
 678                         adb_int_pending = 0;
 679                 } else if (current_req) {
 680                         pmu_start();
 681                 }
 682         }
 683
 684 #if 0
 685         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
 686                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
 687 #endif
 688         return IRQ_HANDLED;
 689 }
 690
 691 static void
 692 pmu_done(struct adb_request *req)
 693 {
 694         req->complete = 1;
 695         if (req->done)
 696                 (*req->done)(req);
 697 }
 698
 699 /* Interrupt data could be the result data from an ADB cmd */
 700 static void
 701 pmu_handle_data(unsigned char *data, int len)
 702 {
 703         static int show_pmu_ints = 1;
 704
 705         asleep = 0;
 706         if (len < 1) {
 707                 adb_int_pending = 0;
 708                 return;
 709         }
 710         if (data[0] & PMU_INT_ADB) {
 711                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
 712                         struct adb_request *req = req_awaiting_reply;
 713                         if (req == 0) {
 714                                 printk(KERN_ERR "PMU: extra ADB reply\n");
 715                                 return;
 716                         }
 717                         req_awaiting_reply = NULL;
 718                         if (len <= 2)
 719                                 req->reply_len = 0;
 720                         else {
 721                                 memcpy(req->reply, data + 1, len - 1);
 722                                 req->reply_len = len - 1;
 723                         }
 724                         pmu_done(req);
 725                 } else {
 726                         adb_input(data+1, len-1, 1);
 727                 }
 728         } else {
 729                 if (data[0] == 0x08 && len == 3) {
 730                         /* sound/brightness buttons pressed */
 731                         pmu_set_brightness(data[1] >> 3);
 732                         set_volume(data[2]);
 733                 } else if (show_pmu_ints
 734                            && !(data[0] == PMU_INT_TICK && len == 1)) {
 735                         int i;
 736                         printk(KERN_DEBUG "pmu intr");
 737                         for (i = 0; i < len; ++i)
 738                                 printk(" %.2x", data[i]);
 739                         printk("\n");
 740                 }
 741         }
 742 }
 743
 744 int backlight_level = -1;
 745 int backlight_enabled = 0;
 746
 747 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
 748
 749 static void
 750 pmu_enable_backlight(int on)
 751 {
 752         struct adb_request req;
 753
 754         if (on) {
 755             /* first call: get current backlight value */
 756             if (backlight_level < 0) {
 757                 switch(pmu_kind) {
 758                     case PMU_68K_V1:
 759                     case PMU_68K_V2:
 760                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
 761                         while (!req.complete)
 762                                 pmu_poll();
 763                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
 764                         backlight_level = req.reply[1];
 765                         break;
 766                     default:
 767                         backlight_enabled = 0;
 768                         return;
 769                 }
 770             }
 771             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 772                 LEVEL_TO_BRIGHT(backlight_level));
 773             while (!req.complete)
 774                 pmu_poll();
 775         }
 776         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
 777             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
 778         while (!req.complete)
 779                 pmu_poll();
 780         backlight_enabled = on;
 781 }
 782
 783 static void
 784 pmu_set_brightness(int level)
 785 {
 786         int bright;
 787
 788         backlight_level = level;
 789         bright = LEVEL_TO_BRIGHT(level);
 790         if (!backlight_enabled)
 791                 return;
 792         if (bright_req_1.complete)
 793                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
 794                     bright);
 795         if (bright_req_2.complete)
 796                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
 797                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
 798 }
 799
 800 void
 801 pmu_enable_irled(int on)
 802 {
 803         struct adb_request req;
 804
 805         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
 806             (on ? PMU_POW_ON : PMU_POW_OFF));
 807         while (!req.complete)
 808                 pmu_poll();
 809 }
 810
 811 static void
 812 set_volume(int level)
 813 {
 814 }
 815
 816 int
 817 pmu_present(void)
 818 {
 819         return (pmu_kind != PMU_UNKNOWN);
 820 }