Root/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
78static enum pmu_state {
79    idle,
80    sending,
81    intack,
82    reading,
83    reading_intr,
84} pmu_state;
85
86static struct adb_request *current_req;
87static struct adb_request *last_req;
88static struct adb_request *req_awaiting_reply;
89static unsigned char interrupt_data[32];
90static unsigned char *reply_ptr;
91static int data_index;
92static int data_len;
93static int adb_int_pending;
94static int pmu_adb_flags;
95static int adb_dev_map;
96static struct adb_request bright_req_1, bright_req_2, bright_req_3;
97static int pmu_kind = PMU_UNKNOWN;
98static int pmu_fully_inited;
99
100int asleep;
101
102static int pmu_probe(void);
103static int pmu_init(void);
104static void pmu_start(void);
105static irqreturn_t pmu_interrupt(int irq, void *arg);
106static int pmu_send_request(struct adb_request *req, int sync);
107static int pmu_autopoll(int devs);
108void pmu_poll(void);
109static int pmu_reset_bus(void);
110
111static void pmu_start(void);
112static void send_byte(int x);
113static void recv_byte(void);
114static void pmu_done(struct adb_request *req);
115static void pmu_handle_data(unsigned char *data, int len);
116static void set_volume(int level);
117static void pmu_enable_backlight(int on);
118static void pmu_set_brightness(int level);
119
120struct 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 */
137static 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
173int 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
188static int
189pmu_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
264int
265pmu_get_model(void)
266{
267    return pmu_kind;
268}
269
270/* Send an ADB command */
271static int
272pmu_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 */
379static int
380pmu_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 */
401static int
402pmu_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 */
446int
447pmu_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
473int
474pmu_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
508static void
509send_byte(int x)
510{
511    via1[ACR] |= SR_CTRL;
512    via1[SR] = x;
513    via2[B] &= ~TREQ; /* assert TREQ */
514}
515
516static void
517recv_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
526static void
527pmu_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
547out:
548    local_irq_restore(flags);
549}
550
551void
552pmu_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
568static irqreturn_t
569pmu_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    }
669finish:
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
687static void
688pmu_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 */
696static void
697pmu_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
740static int backlight_level = -1;
741static int backlight_enabled = 0;
742
743#define LEVEL_TO_BRIGHT(lev) ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
744
745static void
746pmu_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
779static void
780pmu_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
796void
797pmu_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
807static void
808set_volume(int level)
809{
810}
811
812int
813pmu_present(void)
814{
815    return (pmu_kind != PMU_UNKNOWN);
816}
817

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