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Linux/sound/oss/dmasound/dmasound_q40.c

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  1 /*
  2  *  linux/sound/oss/dmasound/dmasound_q40.c
  3  *
  4  *  Q40 DMA Sound Driver
  5  *
  6  *  See linux/sound/oss/dmasound/dmasound_core.c for copyright and credits
  7  *  prior to 28/01/2001
  8  *
  9  *  28/01/2001 [0.1] Iain Sandoe
 10  *                   - added versioning
 11  *                   - put in and populated the hardware_afmts field.
 12  *             [0.2] - put in SNDCTL_DSP_GETCAPS value.
 13  *             [0.3] - put in default hard/soft settings.
 14  */
 15 
 16 
 17 #include <linux/module.h>
 18 #include <linux/init.h>
 19 #include <linux/slab.h>
 20 #include <linux/soundcard.h>
 21 #include <linux/interrupt.h>
 22 
 23 #include <asm/uaccess.h>
 24 #include <asm/q40ints.h>
 25 #include <asm/q40_master.h>
 26 
 27 #include "dmasound.h"
 28 
 29 #define DMASOUND_Q40_REVISION 0
 30 #define DMASOUND_Q40_EDITION 3
 31 
 32 static int expand_bal;  /* Balance factor for expanding (not volume!) */
 33 static int expand_data; /* Data for expanding */
 34 
 35 
 36 /*** Low level stuff *********************************************************/
 37 
 38 
 39 static void *Q40Alloc(unsigned int size, gfp_t flags);
 40 static void Q40Free(void *, unsigned int);
 41 static int Q40IrqInit(void);
 42 #ifdef MODULE
 43 static void Q40IrqCleanUp(void);
 44 #endif
 45 static void Q40Silence(void);
 46 static void Q40Init(void);
 47 static int Q40SetFormat(int format);
 48 static int Q40SetVolume(int volume);
 49 static void Q40PlayNextFrame(int index);
 50 static void Q40Play(void);
 51 static irqreturn_t Q40StereoInterrupt(int irq, void *dummy);
 52 static irqreturn_t Q40MonoInterrupt(int irq, void *dummy);
 53 static void Q40Interrupt(void);
 54 
 55 
 56 /*** Mid level stuff *********************************************************/
 57 
 58 
 59 
 60 /* userCount, frameUsed, frameLeft == byte counts */
 61 static ssize_t q40_ct_law(const u_char __user *userPtr, size_t userCount,
 62                            u_char frame[], ssize_t *frameUsed,
 63                            ssize_t frameLeft)
 64 {
 65         char *table = dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8;
 66         ssize_t count, used;
 67         u_char *p = (u_char *) &frame[*frameUsed];
 68 
 69         used = count = min_t(size_t, userCount, frameLeft);
 70         if (copy_from_user(p,userPtr,count))
 71           return -EFAULT;
 72         while (count > 0) {
 73                 *p = table[*p]+128;
 74                 p++;
 75                 count--;
 76         }
 77         *frameUsed += used ;
 78         return used;
 79 }
 80 
 81 
 82 static ssize_t q40_ct_s8(const u_char __user *userPtr, size_t userCount,
 83                           u_char frame[], ssize_t *frameUsed,
 84                           ssize_t frameLeft)
 85 {
 86         ssize_t count, used;
 87         u_char *p = (u_char *) &frame[*frameUsed];
 88 
 89         used = count = min_t(size_t, userCount, frameLeft);
 90         if (copy_from_user(p,userPtr,count))
 91           return -EFAULT;
 92         while (count > 0) {
 93                 *p = *p + 128;
 94                 p++;
 95                 count--;
 96         }
 97         *frameUsed += used;
 98         return used;
 99 }
100 
101 static ssize_t q40_ct_u8(const u_char __user *userPtr, size_t userCount,
102                           u_char frame[], ssize_t *frameUsed,
103                           ssize_t frameLeft)
104 {
105         ssize_t count, used;
106         u_char *p = (u_char *) &frame[*frameUsed];
107 
108         used = count = min_t(size_t, userCount, frameLeft);
109         if (copy_from_user(p,userPtr,count))
110           return -EFAULT;
111         *frameUsed += used;
112         return used;
113 }
114 
115 
116 /* a bit too complicated to optimise right now ..*/
117 static ssize_t q40_ctx_law(const u_char __user *userPtr, size_t userCount,
118                             u_char frame[], ssize_t *frameUsed,
119                             ssize_t frameLeft)
120 {
121         unsigned char *table = (unsigned char *)
122                 (dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8);
123         unsigned int data = expand_data;
124         u_char *p = (u_char *) &frame[*frameUsed];
125         int bal = expand_bal;
126         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
127         int utotal, ftotal;
128 
129         ftotal = frameLeft;
130         utotal = userCount;
131         while (frameLeft) {
132                 u_char c;
133                 if (bal < 0) {
134                         if (userCount == 0)
135                                 break;
136                         if (get_user(c, userPtr++))
137                                 return -EFAULT;
138                         data = table[c];
139                         data += 0x80;
140                         userCount--;
141                         bal += hSpeed;
142                 }
143                 *p++ = data;
144                 frameLeft--;
145                 bal -= sSpeed;
146         }
147         expand_bal = bal;
148         expand_data = data;
149         *frameUsed += (ftotal - frameLeft);
150         utotal -= userCount;
151         return utotal;
152 }
153 
154 
155 static ssize_t q40_ctx_s8(const u_char __user *userPtr, size_t userCount,
156                            u_char frame[], ssize_t *frameUsed,
157                            ssize_t frameLeft)
158 {
159         u_char *p = (u_char *) &frame[*frameUsed];
160         unsigned int data = expand_data;
161         int bal = expand_bal;
162         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
163         int utotal, ftotal;
164 
165 
166         ftotal = frameLeft;
167         utotal = userCount;
168         while (frameLeft) {
169                 u_char c;
170                 if (bal < 0) {
171                         if (userCount == 0)
172                                 break;
173                         if (get_user(c, userPtr++))
174                                 return -EFAULT;
175                         data = c ;
176                         data += 0x80;
177                         userCount--;
178                         bal += hSpeed;
179                 }
180                 *p++ = data;
181                 frameLeft--;
182                 bal -= sSpeed;
183         }
184         expand_bal = bal;
185         expand_data = data;
186         *frameUsed += (ftotal - frameLeft);
187         utotal -= userCount;
188         return utotal;
189 }
190 
191 
192 static ssize_t q40_ctx_u8(const u_char __user *userPtr, size_t userCount,
193                            u_char frame[], ssize_t *frameUsed,
194                            ssize_t frameLeft)
195 {
196         u_char *p = (u_char *) &frame[*frameUsed];
197         unsigned int data = expand_data;
198         int bal = expand_bal;
199         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
200         int utotal, ftotal;
201 
202         ftotal = frameLeft;
203         utotal = userCount;
204         while (frameLeft) {
205                 u_char c;
206                 if (bal < 0) {
207                         if (userCount == 0)
208                                 break;
209                         if (get_user(c, userPtr++))
210                                 return -EFAULT;
211                         data = c ;
212                         userCount--;
213                         bal += hSpeed;
214                 }
215                 *p++ = data;
216                 frameLeft--;
217                 bal -= sSpeed;
218         }
219         expand_bal = bal;
220         expand_data = data;
221         *frameUsed += (ftotal - frameLeft) ;
222         utotal -= userCount;
223         return utotal;
224 }
225 
226 /* compressing versions */
227 static ssize_t q40_ctc_law(const u_char __user *userPtr, size_t userCount,
228                             u_char frame[], ssize_t *frameUsed,
229                             ssize_t frameLeft)
230 {
231         unsigned char *table = (unsigned char *)
232                 (dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8);
233         unsigned int data = expand_data;
234         u_char *p = (u_char *) &frame[*frameUsed];
235         int bal = expand_bal;
236         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
237         int utotal, ftotal;
238  
239         ftotal = frameLeft;
240         utotal = userCount;
241         while (frameLeft) {
242                 u_char c;
243                 while(bal<0) {
244                         if (userCount == 0)
245                                 goto lout;
246                         if (!(bal<(-hSpeed))) {
247                                 if (get_user(c, userPtr))
248                                         return -EFAULT;
249                                 data = 0x80 + table[c];
250                         }
251                         userPtr++;
252                         userCount--;
253                         bal += hSpeed;
254                 }
255                 *p++ = data;
256                 frameLeft--;
257                 bal -= sSpeed;
258         }
259  lout:
260         expand_bal = bal;
261         expand_data = data;
262         *frameUsed += (ftotal - frameLeft);
263         utotal -= userCount;
264         return utotal;
265 }
266 
267 
268 static ssize_t q40_ctc_s8(const u_char __user *userPtr, size_t userCount,
269                            u_char frame[], ssize_t *frameUsed,
270                            ssize_t frameLeft)
271 {
272         u_char *p = (u_char *) &frame[*frameUsed];
273         unsigned int data = expand_data;
274         int bal = expand_bal;
275         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
276         int utotal, ftotal;
277 
278         ftotal = frameLeft;
279         utotal = userCount;
280         while (frameLeft) {
281                 u_char c;
282                 while (bal < 0) {
283                         if (userCount == 0)
284                                 goto lout;
285                         if (!(bal<(-hSpeed))) {
286                                 if (get_user(c, userPtr))
287                                         return -EFAULT;
288                                 data = c + 0x80;
289                         }
290                         userPtr++;
291                         userCount--;
292                         bal += hSpeed;
293                 }
294                 *p++ = data;
295                 frameLeft--;
296                 bal -= sSpeed;
297         }
298  lout:
299         expand_bal = bal;
300         expand_data = data;
301         *frameUsed += (ftotal - frameLeft);
302         utotal -= userCount;
303         return utotal;
304 }
305 
306 
307 static ssize_t q40_ctc_u8(const u_char __user *userPtr, size_t userCount,
308                            u_char frame[], ssize_t *frameUsed,
309                            ssize_t frameLeft)
310 {
311         u_char *p = (u_char *) &frame[*frameUsed];
312         unsigned int data = expand_data;
313         int bal = expand_bal;
314         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
315         int utotal, ftotal;
316 
317         ftotal = frameLeft;
318         utotal = userCount;
319         while (frameLeft) {
320                 u_char c;
321                 while (bal < 0) {
322                         if (userCount == 0)
323                                 goto lout;
324                         if (!(bal<(-hSpeed))) {
325                                 if (get_user(c, userPtr))
326                                         return -EFAULT;
327                                 data = c ;
328                         }
329                         userPtr++;
330                         userCount--;
331                         bal += hSpeed;
332                 }
333                 *p++ = data;
334                 frameLeft--;
335                 bal -= sSpeed;
336         }
337  lout:
338         expand_bal = bal;
339         expand_data = data;
340         *frameUsed += (ftotal - frameLeft) ;
341         utotal -= userCount;
342         return utotal;
343 }
344 
345 
346 static TRANS transQ40Normal = {
347         q40_ct_law, q40_ct_law, q40_ct_s8, q40_ct_u8, NULL, NULL, NULL, NULL
348 };
349 
350 static TRANS transQ40Expanding = {
351         q40_ctx_law, q40_ctx_law, q40_ctx_s8, q40_ctx_u8, NULL, NULL, NULL, NULL
352 };
353 
354 static TRANS transQ40Compressing = {
355         q40_ctc_law, q40_ctc_law, q40_ctc_s8, q40_ctc_u8, NULL, NULL, NULL, NULL
356 };
357 
358 
359 /*** Low level stuff *********************************************************/
360 
361 static void *Q40Alloc(unsigned int size, gfp_t flags)
362 {
363          return kmalloc(size, flags); /* change to vmalloc */
364 }
365 
366 static void Q40Free(void *ptr, unsigned int size)
367 {
368         kfree(ptr);
369 }
370 
371 static int __init Q40IrqInit(void)
372 {
373         /* Register interrupt handler. */
374         if (request_irq(Q40_IRQ_SAMPLE, Q40StereoInterrupt, 0,
375                     "DMA sound", Q40Interrupt))
376                 return 0;
377 
378         return(1);
379 }
380 
381 
382 #ifdef MODULE
383 static void Q40IrqCleanUp(void)
384 {
385         master_outb(0,SAMPLE_ENABLE_REG);
386         free_irq(Q40_IRQ_SAMPLE, Q40Interrupt);
387 }
388 #endif /* MODULE */
389 
390 
391 static void Q40Silence(void)
392 {
393         master_outb(0,SAMPLE_ENABLE_REG);
394         *DAC_LEFT=*DAC_RIGHT=127;
395 }
396 
397 static char *q40_pp;
398 static unsigned int q40_sc;
399 
400 static void Q40PlayNextFrame(int index)
401 {
402         u_char *start;
403         u_long size;
404         u_char speed;
405         int error;
406 
407         /* used by Q40Play() if all doubts whether there really is something
408          * to be played are already wiped out.
409          */
410         start = write_sq.buffers[write_sq.front];
411         size = (write_sq.count == index ? write_sq.rear_size : write_sq.block_size);
412 
413         q40_pp=start;
414         q40_sc=size;
415 
416         write_sq.front = (write_sq.front+1) % write_sq.max_count;
417         write_sq.active++;
418 
419         speed=(dmasound.hard.speed==10000 ? 0 : 1);
420 
421         master_outb( 0,SAMPLE_ENABLE_REG);
422         free_irq(Q40_IRQ_SAMPLE, Q40Interrupt);
423         if (dmasound.soft.stereo)
424                 error = request_irq(Q40_IRQ_SAMPLE, Q40StereoInterrupt, 0,
425                                     "Q40 sound", Q40Interrupt);
426           else
427                 error = request_irq(Q40_IRQ_SAMPLE, Q40MonoInterrupt, 0,
428                                     "Q40 sound", Q40Interrupt);
429         if (error && printk_ratelimit())
430                 pr_err("Couldn't register sound interrupt\n");
431 
432         master_outb( speed, SAMPLE_RATE_REG);
433         master_outb( 1,SAMPLE_CLEAR_REG);
434         master_outb( 1,SAMPLE_ENABLE_REG);
435 }
436 
437 static void Q40Play(void)
438 {
439         unsigned long flags;
440 
441         if (write_sq.active || write_sq.count<=0 ) {
442                 /* There's already a frame loaded */
443                 return;
444         }
445 
446         /* nothing in the queue */
447         if (write_sq.count <= 1 && write_sq.rear_size < write_sq.block_size && !write_sq.syncing) {
448                  /* hmmm, the only existing frame is not
449                   * yet filled and we're not syncing?
450                   */
451                  return;
452         }
453         spin_lock_irqsave(&dmasound.lock, flags);
454         Q40PlayNextFrame(1);
455         spin_unlock_irqrestore(&dmasound.lock, flags);
456 }
457 
458 static irqreturn_t Q40StereoInterrupt(int irq, void *dummy)
459 {
460         spin_lock(&dmasound.lock);
461         if (q40_sc>1){
462             *DAC_LEFT=*q40_pp++;
463             *DAC_RIGHT=*q40_pp++;
464             q40_sc -=2;
465             master_outb(1,SAMPLE_CLEAR_REG);
466         }else Q40Interrupt();
467         spin_unlock(&dmasound.lock);
468         return IRQ_HANDLED;
469 }
470 static irqreturn_t Q40MonoInterrupt(int irq, void *dummy)
471 {
472         spin_lock(&dmasound.lock);
473         if (q40_sc>0){
474             *DAC_LEFT=*q40_pp;
475             *DAC_RIGHT=*q40_pp++;
476             q40_sc --;
477             master_outb(1,SAMPLE_CLEAR_REG);
478         }else Q40Interrupt();
479         spin_unlock(&dmasound.lock);
480         return IRQ_HANDLED;
481 }
482 static void Q40Interrupt(void)
483 {
484         if (!write_sq.active) {
485                   /* playing was interrupted and sq_reset() has already cleared
486                    * the sq variables, so better don't do anything here.
487                    */
488                    WAKE_UP(write_sq.sync_queue);
489                    master_outb(0,SAMPLE_ENABLE_REG); /* better safe */
490                    goto exit;
491         } else write_sq.active=0;
492         write_sq.count--;
493         Q40Play();
494 
495         if (q40_sc<2)
496               { /* there was nothing to play, disable irq */
497                 master_outb(0,SAMPLE_ENABLE_REG);
498                 *DAC_LEFT=*DAC_RIGHT=127;
499               }
500         WAKE_UP(write_sq.action_queue);
501 
502  exit:
503         master_outb(1,SAMPLE_CLEAR_REG);
504 }
505 
506 
507 static void Q40Init(void)
508 {
509         int i, idx;
510         const int freq[] = {10000, 20000};
511 
512         /* search a frequency that fits into the allowed error range */
513 
514         idx = -1;
515         for (i = 0; i < 2; i++)
516                 if ((100 * abs(dmasound.soft.speed - freq[i]) / freq[i]) <= catchRadius)
517                         idx = i;
518 
519         dmasound.hard = dmasound.soft;
520         /*sound.hard.stereo=1;*/ /* no longer true */
521         dmasound.hard.size=8;
522 
523         if (idx > -1) {
524                 dmasound.soft.speed = freq[idx];
525                 dmasound.trans_write = &transQ40Normal;
526         } else
527                 dmasound.trans_write = &transQ40Expanding;
528 
529         Q40Silence();
530 
531         if (dmasound.hard.speed > 20200) {
532                 /* squeeze the sound, we do that */
533                 dmasound.hard.speed = 20000;
534                 dmasound.trans_write = &transQ40Compressing;
535         } else if (dmasound.hard.speed > 10000) {
536                 dmasound.hard.speed = 20000;
537         } else {
538                 dmasound.hard.speed = 10000;
539         }
540         expand_bal = -dmasound.soft.speed;
541 }
542 
543 
544 static int Q40SetFormat(int format)
545 {
546         /* Q40 sound supports only 8bit modes */
547 
548         switch (format) {
549         case AFMT_QUERY:
550                 return(dmasound.soft.format);
551         case AFMT_MU_LAW:
552         case AFMT_A_LAW:
553         case AFMT_S8:
554         case AFMT_U8:
555                 break;
556         default:
557                 format = AFMT_S8;
558         }
559 
560         dmasound.soft.format = format;
561         dmasound.soft.size = 8;
562         if (dmasound.minDev == SND_DEV_DSP) {
563                 dmasound.dsp.format = format;
564                 dmasound.dsp.size = 8;
565         }
566         Q40Init();
567 
568         return(format);
569 }
570 
571 static int Q40SetVolume(int volume)
572 {
573     return 0;
574 }
575 
576 
577 /*** Machine definitions *****************************************************/
578 
579 static SETTINGS def_hard = {
580         .format = AFMT_U8,
581         .stereo = 0,
582         .size   = 8,
583         .speed  = 10000
584 } ;
585 
586 static SETTINGS def_soft = {
587         .format = AFMT_U8,
588         .stereo = 0,
589         .size   = 8,
590         .speed  = 8000
591 } ;
592 
593 static MACHINE machQ40 = {
594         .name           = "Q40",
595         .name2          = "Q40",
596         .owner          = THIS_MODULE,
597         .dma_alloc      = Q40Alloc,
598         .dma_free       = Q40Free,
599         .irqinit        = Q40IrqInit,
600 #ifdef MODULE
601         .irqcleanup     = Q40IrqCleanUp,
602 #endif /* MODULE */
603         .init           = Q40Init,
604         .silence        = Q40Silence,
605         .setFormat      = Q40SetFormat,
606         .setVolume      = Q40SetVolume,
607         .play           = Q40Play,
608         .min_dsp_speed  = 10000,
609         .version        = ((DMASOUND_Q40_REVISION<<8) | DMASOUND_Q40_EDITION),
610         .hardware_afmts = AFMT_U8, /* h'ware-supported formats *only* here */
611         .capabilities   = DSP_CAP_BATCH  /* As per SNDCTL_DSP_GETCAPS */
612 };
613 
614 
615 /*** Config & Setup **********************************************************/
616 
617 
618 static int __init dmasound_q40_init(void)
619 {
620         if (MACH_IS_Q40) {
621             dmasound.mach = machQ40;
622             dmasound.mach.default_hard = def_hard ;
623             dmasound.mach.default_soft = def_soft ;
624             return dmasound_init();
625         } else
626             return -ENODEV;
627 }
628 
629 static void __exit dmasound_q40_cleanup(void)
630 {
631         dmasound_deinit();
632 }
633 
634 module_init(dmasound_q40_init);
635 module_exit(dmasound_q40_cleanup);
636 
637 MODULE_DESCRIPTION("Q40/Q60 sound driver");
638 MODULE_LICENSE("GPL");
639 

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