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