GNU Linux-libre 4.4.289-gnu1
[releases.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/init.h>
29 #include <linux/interrupt.h>
30
31 #include <linux/adb.h>
32 #include <linux/pmu.h>
33 #include <linux/cuda.h>
34
35 #include <asm/macintosh.h>
36 #include <asm/macints.h>
37 #include <asm/mac_via.h>
38
39 #include <asm/pgtable.h>
40 #include <asm/irq.h>
41 #include <asm/uaccess.h>
42
43 /* Misc minor number allocated for /dev/pmu */
44 #define PMU_MINOR       154
45
46 /* VIA registers - spaced 0x200 bytes apart */
47 #define RS              0x200           /* skip between registers */
48 #define B               0               /* B-side data */
49 #define A               RS              /* A-side data */
50 #define DIRB            (2*RS)          /* B-side direction (1=output) */
51 #define DIRA            (3*RS)          /* A-side direction (1=output) */
52 #define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
53 #define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
54 #define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
55 #define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
56 #define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
57 #define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
58 #define SR              (10*RS)         /* Shift register */
59 #define ACR             (11*RS)         /* Auxiliary control register */
60 #define PCR             (12*RS)         /* Peripheral control register */
61 #define IFR             (13*RS)         /* Interrupt flag register */
62 #define IER             (14*RS)         /* Interrupt enable register */
63 #define ANH             (15*RS)         /* A-side data, no handshake */
64
65 /* Bits in B data register: both active low */
66 #define TACK            0x02            /* Transfer acknowledge (input) */
67 #define TREQ            0x04            /* Transfer request (output) */
68
69 /* Bits in ACR */
70 #define SR_CTRL         0x1c            /* Shift register control bits */
71 #define SR_EXT          0x0c            /* Shift on external clock */
72 #define SR_OUT          0x10            /* Shift out if 1 */
73
74 /* Bits in IFR and IER */
75 #define SR_INT          0x04            /* Shift register full/empty */
76 #define CB1_INT         0x10            /* transition on CB1 input */
77
78 static enum pmu_state {
79         idle,
80         sending,
81         intack,
82         reading,
83         reading_intr,
84 } pmu_state;
85
86 static struct adb_request *current_req;
87 static struct adb_request *last_req;
88 static struct adb_request *req_awaiting_reply;
89 static unsigned char interrupt_data[32];
90 static unsigned char *reply_ptr;
91 static int data_index;
92 static int data_len;
93 static int adb_int_pending;
94 static int pmu_adb_flags;
95 static int adb_dev_map;
96 static struct adb_request bright_req_1, bright_req_2, bright_req_3;
97 static int pmu_kind = PMU_UNKNOWN;
98 static int pmu_fully_inited;
99
100 int asleep;
101
102 static int pmu_probe(void);
103 static int pmu_init(void);
104 static void pmu_start(void);
105 static irqreturn_t pmu_interrupt(int irq, void *arg);
106 static int pmu_send_request(struct adb_request *req, int sync);
107 static int pmu_autopoll(int devs);
108 void pmu_poll(void);
109 static int pmu_reset_bus(void);
110
111 static void pmu_start(void);
112 static void send_byte(int x);
113 static void recv_byte(void);
114 static void pmu_done(struct adb_request *req);
115 static void pmu_handle_data(unsigned char *data, int len);
116 static void set_volume(int level);
117 static void pmu_enable_backlight(int on);
118 static void pmu_set_brightness(int level);
119
120 struct adb_driver via_pmu_driver = {
121         "68K PMU",
122         pmu_probe,
123         pmu_init,
124         pmu_send_request,
125         pmu_autopoll,
126         pmu_poll,
127         pmu_reset_bus
128 };
129
130 /*
131  * This table indicates for each PMU opcode:
132  * - the number of data bytes to be sent with the command, or -1
133  *   if a length byte should be sent,
134  * - the number of response bytes which the PMU will return, or
135  *   -1 if it will send a length byte.
136  */
137 static s8 pmu_data_len[256][2] = {
138 /*         0       1       2       3       4       5       6       7  */
139 /*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
140 /*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
141 /*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
142 /*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
143 /*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
144 /*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
145 /*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
146 /*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
147 /*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
148 /*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
149 /*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
150 /*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
151 /*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
152 /*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
153 /*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
154 /*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
155 /*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
156 /*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
157 /*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
158 /*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
159 /*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
160 /*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
161 /*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
162 /*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
163 /*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
164 /*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
165 /*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
166 /*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
167 /*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
168 /*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
169 /*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
170 /*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
171 };
172
173 int pmu_probe(void)
174 {
175         if (macintosh_config->adb_type == MAC_ADB_PB1) {
176                 pmu_kind = PMU_68K_V1;
177         } else if (macintosh_config->adb_type == MAC_ADB_PB2) {
178                 pmu_kind = PMU_68K_V2;
179         } else {
180                 return -ENODEV;
181         }
182
183         pmu_state = idle;
184
185         return 0;
186 }
187
188 static int 
189 pmu_init(void)
190 {
191         int timeout;
192         volatile struct adb_request req;
193
194         via2[B] |= TREQ;                                /* negate TREQ */
195         via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK;       /* TACK in, TREQ out */
196
197         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
198         timeout =  100000;
199         while (!req.complete) {
200                 if (--timeout < 0) {
201                         printk(KERN_ERR "pmu_init: no response from PMU\n");
202                         return -EAGAIN;
203                 }
204                 udelay(10);
205                 pmu_poll();
206         }
207
208         /* ack all pending interrupts */
209         timeout = 100000;
210         interrupt_data[0] = 1;
211         while (interrupt_data[0] || pmu_state != idle) {
212                 if (--timeout < 0) {
213                         printk(KERN_ERR "pmu_init: timed out acking intrs\n");
214                         return -EAGAIN;
215                 }
216                 if (pmu_state == idle) {
217                         adb_int_pending = 1;
218                         pmu_interrupt(0, NULL);
219                 }
220                 pmu_poll();
221                 udelay(10);
222         }
223
224         pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
225                         PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
226         timeout =  100000;
227         while (!req.complete) {
228                 if (--timeout < 0) {
229                         printk(KERN_ERR "pmu_init: no response from PMU\n");
230                         return -EAGAIN;
231                 }
232                 udelay(10);
233                 pmu_poll();
234         }
235
236         bright_req_1.complete = 1;
237         bright_req_2.complete = 1;
238         bright_req_3.complete = 1;
239
240         if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
241                         pmu_interrupt)) {
242                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
243                         IRQ_MAC_ADB_SR);
244                 return -EAGAIN;
245         }
246         if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
247                         pmu_interrupt)) {
248                 printk(KERN_ERR "pmu_init: can't get irq %d\n",
249                         IRQ_MAC_ADB_CL);
250                 free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
251                 return -EAGAIN;
252         }
253
254         pmu_fully_inited = 1;
255         
256         /* Enable backlight */
257         pmu_enable_backlight(1);
258
259         printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
260
261         return 0;
262 }
263
264 int
265 pmu_get_model(void)
266 {
267         return pmu_kind;
268 }
269
270 /* Send an ADB command */
271 static int 
272 pmu_send_request(struct adb_request *req, int sync)
273 {
274     int i, ret;
275
276     if (!pmu_fully_inited)
277     {
278         req->complete = 1;
279         return -ENXIO;
280    }
281
282     ret = -EINVAL;
283         
284     switch (req->data[0]) {
285     case PMU_PACKET:
286                 for (i = 0; i < req->nbytes - 1; ++i)
287                         req->data[i] = req->data[i+1];
288                 --req->nbytes;
289                 if (pmu_data_len[req->data[0]][1] != 0) {
290                         req->reply[0] = ADB_RET_OK;
291                         req->reply_len = 1;
292                 } else
293                         req->reply_len = 0;
294                 ret = pmu_queue_request(req);
295                 break;
296     case CUDA_PACKET:
297                 switch (req->data[1]) {
298                 case CUDA_GET_TIME:
299                         if (req->nbytes != 2)
300                                 break;
301                         req->data[0] = PMU_READ_RTC;
302                         req->nbytes = 1;
303                         req->reply_len = 3;
304                         req->reply[0] = CUDA_PACKET;
305                         req->reply[1] = 0;
306                         req->reply[2] = CUDA_GET_TIME;
307                         ret = pmu_queue_request(req);
308                         break;
309                 case CUDA_SET_TIME:
310                         if (req->nbytes != 6)
311                                 break;
312                         req->data[0] = PMU_SET_RTC;
313                         req->nbytes = 5;
314                         for (i = 1; i <= 4; ++i)
315                                 req->data[i] = req->data[i+1];
316                         req->reply_len = 3;
317                         req->reply[0] = CUDA_PACKET;
318                         req->reply[1] = 0;
319                         req->reply[2] = CUDA_SET_TIME;
320                         ret = pmu_queue_request(req);
321                         break;
322                 case CUDA_GET_PRAM:
323                         if (req->nbytes != 4)
324                                 break;
325                         req->data[0] = PMU_READ_NVRAM;
326                         req->data[1] = req->data[2];
327                         req->data[2] = req->data[3];
328                         req->nbytes = 3;
329                         req->reply_len = 3;
330                         req->reply[0] = CUDA_PACKET;
331                         req->reply[1] = 0;
332                         req->reply[2] = CUDA_GET_PRAM;
333                         ret = pmu_queue_request(req);
334                         break;
335                 case CUDA_SET_PRAM:
336                         if (req->nbytes != 5)
337                                 break;
338                         req->data[0] = PMU_WRITE_NVRAM;
339                         req->data[1] = req->data[2];
340                         req->data[2] = req->data[3];
341                         req->data[3] = req->data[4];
342                         req->nbytes = 4;
343                         req->reply_len = 3;
344                         req->reply[0] = CUDA_PACKET;
345                         req->reply[1] = 0;
346                         req->reply[2] = CUDA_SET_PRAM;
347                         ret = pmu_queue_request(req);
348                         break;
349                 }
350                 break;
351     case ADB_PACKET:
352                 for (i = req->nbytes - 1; i > 1; --i)
353                         req->data[i+2] = req->data[i];
354                 req->data[3] = req->nbytes - 2;
355                 req->data[2] = pmu_adb_flags;
356                 /*req->data[1] = req->data[1];*/
357                 req->data[0] = PMU_ADB_CMD;
358                 req->nbytes += 2;
359                 req->reply_expected = 1;
360                 req->reply_len = 0;
361                 ret = pmu_queue_request(req);
362                 break;
363     }
364     if (ret)
365     {
366         req->complete = 1;
367         return ret;
368     }
369         
370     if (sync) {
371         while (!req->complete)
372                 pmu_poll();
373     }
374
375     return 0;
376 }
377
378 /* Enable/disable autopolling */
379 static int 
380 pmu_autopoll(int devs)
381 {
382         struct adb_request req;
383
384         if (!pmu_fully_inited) return -ENXIO;
385
386         if (devs) {
387                 adb_dev_map = devs;
388                 pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
389                             adb_dev_map >> 8, adb_dev_map);
390                 pmu_adb_flags = 2;
391         } else {
392                 pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
393                 pmu_adb_flags = 0;
394         }
395         while (!req.complete)
396                 pmu_poll();
397         return 0;
398 }
399
400 /* Reset the ADB bus */
401 static int 
402 pmu_reset_bus(void)
403 {
404         struct adb_request req;
405         long timeout;
406         int save_autopoll = adb_dev_map;
407
408         if (!pmu_fully_inited) return -ENXIO;
409
410         /* anyone got a better idea?? */
411         pmu_autopoll(0);
412
413         req.nbytes = 5;
414         req.done = NULL;
415         req.data[0] = PMU_ADB_CMD;
416         req.data[1] = 0;
417         req.data[2] = 3; /* ADB_BUSRESET ??? */
418         req.data[3] = 0;
419         req.data[4] = 0;
420         req.reply_len = 0;
421         req.reply_expected = 1;
422         if (pmu_queue_request(&req) != 0)
423         {
424                 printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
425                 return -EIO;
426         }
427         while (!req.complete)
428                 pmu_poll();
429         timeout = 100000;
430         while (!req.complete) {
431                 if (--timeout < 0) {
432                         printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
433                         return -EIO;
434                 }
435                 udelay(10);
436                 pmu_poll();
437         }
438
439         if (save_autopoll != 0)
440                 pmu_autopoll(save_autopoll);
441                 
442         return 0;
443 }
444
445 /* Construct and send a pmu request */
446 int 
447 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
448             int nbytes, ...)
449 {
450         va_list list;
451         int i;
452
453         if (nbytes < 0 || nbytes > 32) {
454                 printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
455                 req->complete = 1;
456                 return -EINVAL;
457         }
458         req->nbytes = nbytes;
459         req->done = done;
460         va_start(list, nbytes);
461         for (i = 0; i < nbytes; ++i)
462                 req->data[i] = va_arg(list, int);
463         va_end(list);
464         if (pmu_data_len[req->data[0]][1] != 0) {
465                 req->reply[0] = ADB_RET_OK;
466                 req->reply_len = 1;
467         } else
468                 req->reply_len = 0;
469         req->reply_expected = 0;
470         return pmu_queue_request(req);
471 }
472
473 int
474 pmu_queue_request(struct adb_request *req)
475 {
476         unsigned long flags;
477         int nsend;
478
479         if (req->nbytes <= 0) {
480                 req->complete = 1;
481                 return 0;
482         }
483         nsend = pmu_data_len[req->data[0]][0];
484         if (nsend >= 0 && req->nbytes != nsend + 1) {
485                 req->complete = 1;
486                 return -EINVAL;
487         }
488
489         req->next = NULL;
490         req->sent = 0;
491         req->complete = 0;
492         local_irq_save(flags);
493
494         if (current_req != 0) {
495                 last_req->next = req;
496                 last_req = req;
497         } else {
498                 current_req = req;
499                 last_req = req;
500                 if (pmu_state == idle)
501                         pmu_start();
502         }
503
504         local_irq_restore(flags);
505         return 0;
506 }
507
508 static void 
509 send_byte(int x)
510 {
511         via1[ACR] |= SR_CTRL;
512         via1[SR] = x;
513         via2[B] &= ~TREQ;               /* assert TREQ */
514 }
515
516 static void 
517 recv_byte(void)
518 {
519         char c;
520
521         via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
522         c = via1[SR];           /* resets SR */
523         via2[B] &= ~TREQ;
524 }
525
526 static void 
527 pmu_start(void)
528 {
529         unsigned long flags;
530         struct adb_request *req;
531
532         /* assert pmu_state == idle */
533         /* get the packet to send */
534         local_irq_save(flags);
535         req = current_req;
536         if (req == 0 || pmu_state != idle
537             || (req->reply_expected && req_awaiting_reply))
538                 goto out;
539
540         pmu_state = sending;
541         data_index = 1;
542         data_len = pmu_data_len[req->data[0]][0];
543
544         /* set the shift register to shift out and send a byte */
545         send_byte(req->data[0]);
546
547 out:
548         local_irq_restore(flags);
549 }
550
551 void 
552 pmu_poll(void)
553 {
554         unsigned long flags;
555
556         local_irq_save(flags);
557         if (via1[IFR] & SR_INT) {
558                 via1[IFR] = SR_INT;
559                 pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
560         }
561         if (via1[IFR] & CB1_INT) {
562                 via1[IFR] = CB1_INT;
563                 pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
564         }
565         local_irq_restore(flags);
566 }
567
568 static irqreturn_t
569 pmu_interrupt(int irq, void *dev_id)
570 {
571         struct adb_request *req;
572         int timeout, bite = 0;  /* to prevent compiler warning */
573
574 #if 0
575         printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
576                 irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
577 #endif
578
579         if (irq == IRQ_MAC_ADB_CL) {            /* CB1 interrupt */
580                 adb_int_pending = 1;
581         } else if (irq == IRQ_MAC_ADB_SR) {     /* SR interrupt  */
582                 if (via2[B] & TACK) {
583                         printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
584                 }
585
586                 /* if reading grab the byte */
587                 if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
588
589                 /* reset TREQ and wait for TACK to go high */
590                 via2[B] |= TREQ;
591                 timeout = 3200;
592                 while (!(via2[B] & TACK)) {
593                         if (--timeout < 0) {
594                                 printk(KERN_ERR "PMU not responding (!ack)\n");
595                                 goto finish;
596                         }
597                         udelay(10);
598                 }
599
600                 switch (pmu_state) {
601                 case sending:
602                         req = current_req;
603                         if (data_len < 0) {
604                                 data_len = req->nbytes - 1;
605                                 send_byte(data_len);
606                                 break;
607                         }
608                         if (data_index <= data_len) {
609                                 send_byte(req->data[data_index++]);
610                                 break;
611                         }
612                         req->sent = 1;
613                         data_len = pmu_data_len[req->data[0]][1];
614                         if (data_len == 0) {
615                                 pmu_state = idle;
616                                 current_req = req->next;
617                                 if (req->reply_expected)
618                                         req_awaiting_reply = req;
619                                 else
620                                         pmu_done(req);
621                         } else {
622                                 pmu_state = reading;
623                                 data_index = 0;
624                                 reply_ptr = req->reply + req->reply_len;
625                                 recv_byte();
626                         }
627                         break;
628
629                 case intack:
630                         data_index = 0;
631                         data_len = -1;
632                         pmu_state = reading_intr;
633                         reply_ptr = interrupt_data;
634                         recv_byte();
635                         break;
636
637                 case reading:
638                 case reading_intr:
639                         if (data_len == -1) {
640                                 data_len = bite;
641                                 if (bite > 32)
642                                         printk(KERN_ERR "PMU: bad reply len %d\n",
643                                                bite);
644                         } else {
645                                 reply_ptr[data_index++] = bite;
646                         }
647                         if (data_index < data_len) {
648                                 recv_byte();
649                                 break;
650                         }
651
652                         if (pmu_state == reading_intr) {
653                                 pmu_handle_data(interrupt_data, data_index);
654                         } else {
655                                 req = current_req;
656                                 current_req = req->next;
657                                 req->reply_len += data_index;
658                                 pmu_done(req);
659                         }
660                         pmu_state = idle;
661
662                         break;
663
664                 default:
665                         printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
666                                pmu_state);
667                 }
668         }
669 finish:
670         if (pmu_state == idle) {
671                 if (adb_int_pending) {
672                         pmu_state = intack;
673                         send_byte(PMU_INT_ACK);
674                         adb_int_pending = 0;
675                 } else if (current_req) {
676                         pmu_start();
677                 }
678         }
679
680 #if 0
681         printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
682                 pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
683 #endif
684         return IRQ_HANDLED;
685 }
686
687 static void 
688 pmu_done(struct adb_request *req)
689 {
690         req->complete = 1;
691         if (req->done)
692                 (*req->done)(req);
693 }
694
695 /* Interrupt data could be the result data from an ADB cmd */
696 static void 
697 pmu_handle_data(unsigned char *data, int len)
698 {
699         static int show_pmu_ints = 1;
700
701         asleep = 0;
702         if (len < 1) {
703                 adb_int_pending = 0;
704                 return;
705         }
706         if (data[0] & PMU_INT_ADB) {
707                 if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
708                         struct adb_request *req = req_awaiting_reply;
709                         if (req == 0) {
710                                 printk(KERN_ERR "PMU: extra ADB reply\n");
711                                 return;
712                         }
713                         req_awaiting_reply = NULL;
714                         if (len <= 2)
715                                 req->reply_len = 0;
716                         else {
717                                 memcpy(req->reply, data + 1, len - 1);
718                                 req->reply_len = len - 1;
719                         }
720                         pmu_done(req);
721                 } else {
722                         adb_input(data+1, len-1, 1);
723                 }
724         } else {
725                 if (data[0] == 0x08 && len == 3) {
726                         /* sound/brightness buttons pressed */
727                         pmu_set_brightness(data[1] >> 3);
728                         set_volume(data[2]);
729                 } else if (show_pmu_ints
730                            && !(data[0] == PMU_INT_TICK && len == 1)) {
731                         int i;
732                         printk(KERN_DEBUG "pmu intr");
733                         for (i = 0; i < len; ++i)
734                                 printk(" %.2x", data[i]);
735                         printk("\n");
736                 }
737         }
738 }
739
740 static int backlight_level = -1;
741 static int backlight_enabled = 0;
742
743 #define LEVEL_TO_BRIGHT(lev)    ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
744
745 static void 
746 pmu_enable_backlight(int on)
747 {
748         struct adb_request req;
749
750         if (on) {
751             /* first call: get current backlight value */
752             if (backlight_level < 0) {
753                 switch(pmu_kind) {
754                     case PMU_68K_V1:
755                     case PMU_68K_V2:
756                         pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
757                         while (!req.complete)
758                                 pmu_poll();
759                         printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
760                         backlight_level = req.reply[1];
761                         break;
762                     default:
763                         backlight_enabled = 0;
764                         return;
765                 }
766             }
767             pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
768                 LEVEL_TO_BRIGHT(backlight_level));
769             while (!req.complete)
770                 pmu_poll();
771         }
772         pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
773             PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
774         while (!req.complete)
775                 pmu_poll();
776         backlight_enabled = on;
777 }
778
779 static void 
780 pmu_set_brightness(int level)
781 {
782         int bright;
783
784         backlight_level = level;
785         bright = LEVEL_TO_BRIGHT(level);
786         if (!backlight_enabled)
787                 return;
788         if (bright_req_1.complete)
789                 pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
790                     bright);
791         if (bright_req_2.complete)
792                 pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
793                     PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
794 }
795
796 void 
797 pmu_enable_irled(int on)
798 {
799         struct adb_request req;
800
801         pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
802             (on ? PMU_POW_ON : PMU_POW_OFF));
803         while (!req.complete)
804                 pmu_poll();
805 }
806
807 static void 
808 set_volume(int level)
809 {
810 }
811
812 int
813 pmu_present(void)
814 {
815         return (pmu_kind != PMU_UNKNOWN);
816 }