m68k: machw.h cleanup
[linux-2.6.git] / drivers / macintosh / via-pmu68k.c
1 /*
2  * Device driver for the PMU on 68K-based Apple PowerBooks
3  *
4  * The VIA (versatile interface adapter) interfaces to the PMU,
5  * a 6805 microprocessor core whose primary function is to control
6  * battery charging and system power on the PowerBooks.
7  * The PMU also controls the ADB (Apple Desktop Bus) which connects
8  * to the keyboard and mouse, as well as the non-volatile RAM
9  * and the RTC (real time clock) chip.
10  *
11  * Adapted for 68K PMU by Joshua M. Thompson
12  *
13  * Based largely on the PowerMac PMU code by Paul Mackerras and
14  * Fabio Riccardi.
15  *
16  * Also based on the PMU driver from MkLinux by Apple Computer, Inc.
17  * and the Open Software Foundation, Inc.
18  */
19
20 #include <stdarg.h>
21 #include <linux/types.h>
22 #include <linux/errno.h>
23 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/miscdevice.h>
26 #include <linux/blkdev.h>
27 #include <linux/pci.h>
28 #include <linux/slab.h>
29 #include <linux/init.h>
30 #include <linux/interrupt.h>
31
32 #include <linux/adb.h>
33 #include <linux/pmu.h>
34 #include <linux/cuda.h>
35
36 #include <asm/macintosh.h>
37 #include <asm/macints.h>
38 #include <asm/mac_via.h>
39
40 #include <asm/pgtable.h>
41 #include <asm/system.h>
42 #include <asm/irq.h>
43 #include <asm/uaccess.h>
44
45 /* Misc minor number allocated for /dev/pmu */
46 #define PMU_MINOR       154
47
48 /* VIA registers - spaced 0x200 bytes apart */
49 #define RS              0x200           /* skip between registers */
50 #define B               0               /* B-side data */
51 #define A               RS              /* A-side data */
52 #define DIRB            (2*RS)          /* B-side direction (1=output) */
53 #define DIRA            (3*RS)          /* A-side direction (1=output) */
54 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
55 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
56 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
57 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
58 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
59 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
60 #define SR              (10*RS)         /* Shift register */
61 #define ACR             (11*RS)         /* Auxiliary control register */
62 #define PCR             (12*RS)         /* Peripheral control register */
63 #define IFR             (13*RS)         /* Interrupt flag register */
64 #define IER             (14*RS)         /* Interrupt enable register */
65 #define ANH             (15*RS)         /* A-side data, no handshake */
66
67 /* Bits in B data register: both active low */
68 #define TACK            0x02            /* Transfer acknowledge (input) */
69 #define TREQ            0x04            /* Transfer request (output) */
70
71 /* Bits in ACR */
72 #define SR_CTRL         0x1c            /* Shift register control bits */
73 #define SR_EXT          0x0c            /* Shift on external clock */
74 #define SR_OUT          0x10            /* Shift out if 1 */
75
76 /* Bits in IFR and IER */
77 #define SR_INT          0x04            /* Shift register full/empty */
78 #define CB1_INT         0x10            /* transition on CB1 input */
79
80 static enum pmu_state {
81         idle,
82         sending,
83         intack,
84         reading,
85         reading_intr,
86 } pmu_state;
87
88 static struct adb_request *current_req;
89 static struct adb_request *last_req;
90 static struct adb_request *req_awaiting_reply;
91 static unsigned char interrupt_data[32];
92 static unsigned char *reply_ptr;
93 static int data_index;
94 static int data_len;
95 static int adb_int_pending;
96 static int pmu_adb_flags;
97 static int adb_dev_map;
98 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
99 static int pmu_kind = PMU_UNKNOWN;
100 static int pmu_fully_inited;
101
102 int asleep;
103
104 static int pmu_probe(void);
105 static int pmu_init(void);
106 static void pmu_start(void);
107 static irqreturn_t pmu_interrupt(int irq, void *arg);
108 static int pmu_send_request(struct adb_request *req, int sync);
109 static int pmu_autopoll(int devs);
110 void pmu_poll(void);
111 static int pmu_reset_bus(void);
112
113 static void pmu_start(void);
114 static void send_byte(int x);
115 static void recv_byte(void);
116 static void pmu_done(struct adb_request *req);
117 static void pmu_handle_data(unsigned char *data, int len);
118 static void set_volume(int level);
119 static void pmu_enable_backlight(int on);
120 static void pmu_set_brightness(int level);
121
122 struct adb_driver via_pmu_driver = {
123         "68K PMU",
124         pmu_probe,
125         pmu_init,
126         pmu_send_request,
127         pmu_autopoll,
128         pmu_poll,
129         pmu_reset_bus
130 };
131
132 /*
133  * This table indicates for each PMU opcode:
134  * - the number of data bytes to be sent with the command, or -1
135  *   if a length byte should be sent,
136  * - the number of response bytes which the PMU will return, or
137  *   -1 if it will send a length byte.
138  */
139 static s8 pmu_data_len[256][2] = {
140 /*         0       1       2       3       4       5       6       7  */
141 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
142 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
143 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
144 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
145 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
146 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
147 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
148 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
149 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
150 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
151 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
152 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
153 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
154 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
155 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
156 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
157 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
158 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
159 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
160 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
161 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
162 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
163 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
164 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
165 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
166 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
167 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
168 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
169 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
170 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
171 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
172 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
173 };
174
175 int pmu_probe(void)
176 {
177         if (macintosh_config->adb_type == MAC_ADB_PB1) {
178                 pmu_kind = PMU_68K_V1;
179         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
180                 pmu_kind = PMU_68K_V2;
181         } else {
182                 return -ENODEV;
183         }
184
185         pmu_state = idle;
186
187         return 0;
188 }
189
190 static int 
191 pmu_init(void)
192 {
193         int timeout;
194         volatile struct adb_request req;
195
196         via2[B] |= TREQ;                                /* negate TREQ */
197         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
198
199         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
200         timeout =  100000;
201         while (!req.complete) {
202                 if (--timeout < 0) {
203                         printk(KERN_ERR "pmu_init: no response from PMU\n");
204                         return -EAGAIN;
205                 }
206                 udelay(10);
207                 pmu_poll();
208         }
209
210         /* ack all pending interrupts */
211         timeout = 100000;
212         interrupt_data[0] = 1;
213         while (interrupt_data[0] || pmu_state != idle) {
214                 if (--timeout < 0) {
215                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
216                         return -EAGAIN;
217                 }
218                 if (pmu_state == idle) {
219                         adb_int_pending = 1;
220                         pmu_interrupt(0, NULL);
221                 }
222                 pmu_poll();
223                 udelay(10);
224         }
225
226         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
227                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
228         timeout =  100000;
229         while (!req.complete) {
230                 if (--timeout < 0) {
231                         printk(KERN_ERR "pmu_init: no response from PMU\n");
232                         return -EAGAIN;
233                 }
234                 udelay(10);
235                 pmu_poll();
236         }
237
238         bright_req_1.complete = 1;
239         bright_req_2.complete = 1;
240         bright_req_3.complete = 1;
241
242         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
243                         pmu_interrupt)) {
244                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
245                         IRQ_MAC_ADB_SR);
246                 return -EAGAIN;
247         }
248         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
249                         pmu_interrupt)) {
250                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
251                         IRQ_MAC_ADB_CL);
252                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
253                 return -EAGAIN;
254         }
255
256         pmu_fully_inited = 1;
257         
258         /* Enable backlight */
259         pmu_enable_backlight(1);
260
261         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
262
263         return 0;
264 }
265
266 int
267 pmu_get_model(void)
268 {
269         return pmu_kind;
270 }
271
272 /* Send an ADB command */
273 static int 
274 pmu_send_request(struct adb_request *req, int sync)
275 {
276     int i, ret;
277
278     if (!pmu_fully_inited)
279     {
280         req->complete = 1;
281         return -ENXIO;
282    }
283
284     ret = -EINVAL;
285         
286     switch (req->data[0]) {
287     case PMU_PACKET:
288                 for (i = 0; i < req->nbytes - 1; ++i)
289                         req->data[i] = req->data[i+1];
290                 --req->nbytes;
291                 if (pmu_data_len[req->data[0]][1] != 0) {
292                         req->reply[0] = ADB_RET_OK;
293                         req->reply_len = 1;
294                 } else
295                         req->reply_len = 0;
296                 ret = pmu_queue_request(req);
297                 break;
298     case CUDA_PACKET:
299                 switch (req->data[1]) {
300                 case CUDA_GET_TIME:
301                         if (req->nbytes != 2)
302                                 break;
303                         req->data[0] = PMU_READ_RTC;
304                         req->nbytes = 1;
305                         req->reply_len = 3;
306                         req->reply[0] = CUDA_PACKET;
307                         req->reply[1] = 0;
308                         req->reply[2] = CUDA_GET_TIME;
309                         ret = pmu_queue_request(req);
310                         break;
311                 case CUDA_SET_TIME:
312                         if (req->nbytes != 6)
313                                 break;
314                         req->data[0] = PMU_SET_RTC;
315                         req->nbytes = 5;
316                         for (i = 1; i <= 4; ++i)
317                                 req->data[i] = req->data[i+1];
318                         req->reply_len = 3;
319                         req->reply[0] = CUDA_PACKET;
320                         req->reply[1] = 0;
321                         req->reply[2] = CUDA_SET_TIME;
322                         ret = pmu_queue_request(req);
323                         break;
324                 case CUDA_GET_PRAM:
325                         if (req->nbytes != 4)
326                                 break;
327                         req->data[0] = PMU_READ_NVRAM;
328                         req->data[1] = req->data[2];
329                         req->data[2] = req->data[3];
330                         req->nbytes = 3;
331                         req->reply_len = 3;
332                         req->reply[0] = CUDA_PACKET;
333                         req->reply[1] = 0;
334                         req->reply[2] = CUDA_GET_PRAM;
335                         ret = pmu_queue_request(req);
336                         break;
337                 case CUDA_SET_PRAM:
338                         if (req->nbytes != 5)
339                                 break;
340                         req->data[0] = PMU_WRITE_NVRAM;
341                         req->data[1] = req->data[2];
342                         req->data[2] = req->data[3];
343                         req->data[3] = req->data[4];
344                         req->nbytes = 4;
345                         req->reply_len = 3;
346                         req->reply[0] = CUDA_PACKET;
347                         req->reply[1] = 0;
348                         req->reply[2] = CUDA_SET_PRAM;
349                         ret = pmu_queue_request(req);
350                         break;
351                 }
352                 break;
353     case ADB_PACKET:
354                 for (i = req->nbytes - 1; i > 1; --i)
355                         req->data[i+2] = req->data[i];
356                 req->data[3] = req->nbytes - 2;
357                 req->data[2] = pmu_adb_flags;
358                 /*req->data[1] = req->data[1];*/
359                 req->data[0] = PMU_ADB_CMD;
360                 req->nbytes += 2;
361                 req->reply_expected = 1;
362                 req->reply_len = 0;
363                 ret = pmu_queue_request(req);
364                 break;
365     }
366     if (ret)
367     {
368         req->complete = 1;
369         return ret;
370     }
371         
372     if (sync) {
373         while (!req->complete)
374                 pmu_poll();
375     }
376
377     return 0;
378 }
379
380 /* Enable/disable autopolling */
381 static int 
382 pmu_autopoll(int devs)
383 {
384         struct adb_request req;
385
386         if (!pmu_fully_inited) return -ENXIO;
387
388         if (devs) {
389                 adb_dev_map = devs;
390                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
391                             adb_dev_map >> 8, adb_dev_map);
392                 pmu_adb_flags = 2;
393         } else {
394                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
395                 pmu_adb_flags = 0;
396         }
397         while (!req.complete)
398                 pmu_poll();
399         return 0;
400 }
401
402 /* Reset the ADB bus */
403 static int 
404 pmu_reset_bus(void)
405 {
406         struct adb_request req;
407         long timeout;
408         int save_autopoll = adb_dev_map;
409
410         if (!pmu_fully_inited) return -ENXIO;
411
412         /* anyone got a better idea?? */
413         pmu_autopoll(0);
414
415         req.nbytes = 5;
416         req.done = NULL;
417         req.data[0] = PMU_ADB_CMD;
418         req.data[1] = 0;
419         req.data[2] = 3; /* ADB_BUSRESET ??? */
420         req.data[3] = 0;
421         req.data[4] = 0;
422         req.reply_len = 0;
423         req.reply_expected = 1;
424         if (pmu_queue_request(&req) != 0)
425         {
426                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
427                 return -EIO;
428         }
429         while (!req.complete)
430                 pmu_poll();
431         timeout = 100000;
432         while (!req.complete) {
433                 if (--timeout < 0) {
434                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
435                         return -EIO;
436                 }
437                 udelay(10);
438                 pmu_poll();
439         }
440
441         if (save_autopoll != 0)
442                 pmu_autopoll(save_autopoll);
443                 
444         return 0;
445 }
446
447 /* Construct and send a pmu request */
448 int 
449 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
450             int nbytes, ...)
451 {
452         va_list list;
453         int i;
454
455         if (nbytes < 0 || nbytes > 32) {
456                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
457                 req->complete = 1;
458                 return -EINVAL;
459         }
460         req->nbytes = nbytes;
461         req->done = done;
462         va_start(list, nbytes);
463         for (i = 0; i < nbytes; ++i)
464                 req->data[i] = va_arg(list, int);
465         va_end(list);
466         if (pmu_data_len[req->data[0]][1] != 0) {
467                 req->reply[0] = ADB_RET_OK;
468                 req->reply_len = 1;
469         } else
470                 req->reply_len = 0;
471         req->reply_expected = 0;
472         return pmu_queue_request(req);
473 }
474
475 int
476 pmu_queue_request(struct adb_request *req)
477 {
478         unsigned long flags;
479         int nsend;
480
481         if (req->nbytes <= 0) {
482                 req->complete = 1;
483                 return 0;
484         }
485         nsend = pmu_data_len[req->data[0]][0];
486         if (nsend >= 0 && req->nbytes != nsend + 1) {
487                 req->complete = 1;
488                 return -EINVAL;
489         }
490
491         req->next = NULL;
492         req->sent = 0;
493         req->complete = 0;
494         local_irq_save(flags);
495
496         if (current_req != 0) {
497                 last_req->next = req;
498                 last_req = req;
499         } else {
500                 current_req = req;
501                 last_req = req;
502                 if (pmu_state == idle)
503                         pmu_start();
504         }
505
506         local_irq_restore(flags);
507         return 0;
508 }
509
510 static void 
511 send_byte(int x)
512 {
513         via1[ACR] |= SR_CTRL;
514         via1[SR] = x;
515         via2[B] &= ~TREQ;               /* assert TREQ */
516 }
517
518 static void 
519 recv_byte(void)
520 {
521         char c;
522
523         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
524         c = via1[SR];           /* resets SR */
525         via2[B] &= ~TREQ;
526 }
527
528 static void 
529 pmu_start(void)
530 {
531         unsigned long flags;
532         struct adb_request *req;
533
534         /* assert pmu_state == idle */
535         /* get the packet to send */
536         local_irq_save(flags);
537         req = current_req;
538         if (req == 0 || pmu_state != idle
539             || (req->reply_expected && req_awaiting_reply))
540                 goto out;
541
542         pmu_state = sending;
543         data_index = 1;
544         data_len = pmu_data_len[req->data[0]][0];
545
546         /* set the shift register to shift out and send a byte */
547         send_byte(req->data[0]);
548
549 out:
550         local_irq_restore(flags);
551 }
552
553 void 
554 pmu_poll(void)
555 {
556         unsigned long flags;
557
558         local_irq_save(flags);
559         if (via1[IFR] & SR_INT) {
560                 via1[IFR] = SR_INT;
561                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
562         }
563         if (via1[IFR] & CB1_INT) {
564                 via1[IFR] = CB1_INT;
565                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
566         }
567         local_irq_restore(flags);
568 }
569
570 static irqreturn_t
571 pmu_interrupt(int irq, void *dev_id)
572 {
573         struct adb_request *req;
574         int timeout, bite = 0;  /* to prevent compiler warning */
575
576 #if 0
577         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
578                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
579 #endif
580
581         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
582                 adb_int_pending = 1;
583         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
584                 if (via2[B] & TACK) {
585                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
586                 }
587
588                 /* if reading grab the byte */
589                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
590
591                 /* reset TREQ and wait for TACK to go high */
592                 via2[B] |= TREQ;
593                 timeout = 3200;
594                 while (!(via2[B] & TACK)) {
595                         if (--timeout < 0) {
596                                 printk(KERN_ERR "PMU not responding (!ack)\n");
597                                 goto finish;
598                         }
599                         udelay(10);
600                 }
601
602                 switch (pmu_state) {
603                 case sending:
604                         req = current_req;
605                         if (data_len < 0) {
606                                 data_len = req->nbytes - 1;
607                                 send_byte(data_len);
608                                 break;
609                         }
610                         if (data_index <= data_len) {
611                                 send_byte(req->data[data_index++]);
612                                 break;
613                         }
614                         req->sent = 1;
615                         data_len = pmu_data_len[req->data[0]][1];
616                         if (data_len == 0) {
617                                 pmu_state = idle;
618                                 current_req = req->next;
619                                 if (req->reply_expected)
620                                         req_awaiting_reply = req;
621                                 else
622                                         pmu_done(req);
623                         } else {
624                                 pmu_state = reading;
625                                 data_index = 0;
626                                 reply_ptr = req->reply + req->reply_len;
627                                 recv_byte();
628                         }
629                         break;
630
631                 case intack:
632                         data_index = 0;
633                         data_len = -1;
634                         pmu_state = reading_intr;
635                         reply_ptr = interrupt_data;
636                         recv_byte();
637                         break;
638
639                 case reading:
640                 case reading_intr:
641                         if (data_len == -1) {
642                                 data_len = bite;
643                                 if (bite > 32)
644                                         printk(KERN_ERR "PMU: bad reply len %d\n",
645                                                bite);
646                         } else {
647                                 reply_ptr[data_index++] = bite;
648                         }
649                         if (data_index < data_len) {
650                                 recv_byte();
651                                 break;
652                         }
653
654                         if (pmu_state == reading_intr) {
655                                 pmu_handle_data(interrupt_data, data_index);
656                         } else {
657                                 req = current_req;
658                                 current_req = req->next;
659                                 req->reply_len += data_index;
660                                 pmu_done(req);
661                         }
662                         pmu_state = idle;
663
664                         break;
665
666                 default:
667                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
668                                pmu_state);
669                 }
670         }
671 finish:
672         if (pmu_state == idle) {
673                 if (adb_int_pending) {
674                         pmu_state = intack;
675                         send_byte(PMU_INT_ACK);
676                         adb_int_pending = 0;
677                 } else if (current_req) {
678                         pmu_start();
679                 }
680         }
681
682 #if 0
683         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
684                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
685 #endif
686         return IRQ_HANDLED;
687 }
688
689 static void 
690 pmu_done(struct adb_request *req)
691 {
692         req->complete = 1;
693         if (req->done)
694                 (*req->done)(req);
695 }
696
697 /* Interrupt data could be the result data from an ADB cmd */
698 static void 
699 pmu_handle_data(unsigned char *data, int len)
700 {
701         static int show_pmu_ints = 1;
702
703         asleep = 0;
704         if (len < 1) {
705                 adb_int_pending = 0;
706                 return;
707         }
708         if (data[0] & PMU_INT_ADB) {
709                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
710                         struct adb_request *req = req_awaiting_reply;
711                         if (req == 0) {
712                                 printk(KERN_ERR "PMU: extra ADB reply\n");
713                                 return;
714                         }
715                         req_awaiting_reply = NULL;
716                         if (len <= 2)
717                                 req->reply_len = 0;
718                         else {
719                                 memcpy(req->reply, data + 1, len - 1);
720                                 req->reply_len = len - 1;
721                         }
722                         pmu_done(req);
723                 } else {
724                         adb_input(data+1, len-1, 1);
725                 }
726         } else {
727                 if (data[0] == 0x08 && len == 3) {
728                         /* sound/brightness buttons pressed */
729                         pmu_set_brightness(data[1] >> 3);
730                         set_volume(data[2]);
731                 } else if (show_pmu_ints
732                            && !(data[0] == PMU_INT_TICK && len == 1)) {
733                         int i;
734                         printk(KERN_DEBUG "pmu intr");
735                         for (i = 0; i < len; ++i)
736                                 printk(" %.2x", data[i]);
737                         printk("\n");
738                 }
739         }
740 }
741
742 static int backlight_level = -1;
743 static int backlight_enabled = 0;
744
745 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
746
747 static void 
748 pmu_enable_backlight(int on)
749 {
750         struct adb_request req;
751
752         if (on) {
753             /* first call: get current backlight value */
754             if (backlight_level < 0) {
755                 switch(pmu_kind) {
756                     case PMU_68K_V1:
757                     case PMU_68K_V2:
758                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
759                         while (!req.complete)
760                                 pmu_poll();
761                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
762                         backlight_level = req.reply[1];
763                         break;
764                     default:
765                         backlight_enabled = 0;
766                         return;
767                 }
768             }
769             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
770                 LEVEL_TO_BRIGHT(backlight_level));
771             while (!req.complete)
772                 pmu_poll();
773         }
774         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
775             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
776         while (!req.complete)
777                 pmu_poll();
778         backlight_enabled = on;
779 }
780
781 static void 
782 pmu_set_brightness(int level)
783 {
784         int bright;
785
786         backlight_level = level;
787         bright = LEVEL_TO_BRIGHT(level);
788         if (!backlight_enabled)
789                 return;
790         if (bright_req_1.complete)
791                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
792                     bright);
793         if (bright_req_2.complete)
794                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
795                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
796 }
797
798 void 
799 pmu_enable_irled(int on)
800 {
801         struct adb_request req;
802
803         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
804             (on ? PMU_POW_ON : PMU_POW_OFF));
805         while (!req.complete)
806                 pmu_poll();
807 }
808
809 static void 
810 set_volume(int level)
811 {
812 }
813
814 int
815 pmu_present(void)
816 {
817         return (pmu_kind != PMU_UNKNOWN);
818 }