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