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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / macintosh / via-pmu68k.c
blobaeb30d07d5a29bd9981759d3cc91ab535520ea9c
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 }