2 * pas2_pcm.c Audio routines for PAS16
5 * Copyright (C) by Hannu Savolainen 1993-1997
7 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
8 * Version 2 (June 1991). See the "COPYING" file distributed with this software
12 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
13 * Alan Cox : Swatted a double allocation of device bug. Made a few
14 * more things module options.
15 * Bartlomiej Zolnierkiewicz : Added __init to pas_pcm_init()
18 #include <linux/init.h>
19 #include "sound_config.h"
27 #define PAS_PCM_INTRBITS (0x08)
29 * Sample buffer timer interrupt enable
36 static unsigned long pcm_speed
= 0; /* sampling rate */
37 static unsigned char pcm_channels
= 1; /* channels (1 or 2) */
38 static unsigned char pcm_bits
= 8; /* bits/sample (8 or 16) */
39 static unsigned char pcm_filter
= 0; /* filter FLAG */
40 static unsigned char pcm_mode
= PCM_NON
;
41 static unsigned long pcm_count
= 0;
42 static unsigned short pcm_bitsok
= 8; /* mask of OK bits */
43 static int pcm_busy
= 0;
44 int pas_audiodev
= -1;
45 static int open_mode
= 0;
47 static int pcm_set_speed(int arg
)
62 foo
= (596590 + (arg
/ 2)) / arg
;
63 arg
= (596590 + (foo
/ 2)) / foo
;
67 foo
= (1193180 + (arg
/ 2)) / arg
;
68 arg
= (1193180 + (foo
/ 2)) / foo
;
73 tmp
= pas_read(0x0B8A);
76 * Set anti-aliasing filters according to sample rate. You really *NEED*
77 * to enable this feature for all normal recording unless you want to
78 * experiment with aliasing effects.
79 * These filters apply to the selected "recording" source.
80 * I (pfw) don't know the encoding of these 5 bits. The values shown
81 * come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.
83 * I cleared bit 5 of these values, since that bit controls the master
84 * mute flag. (Olav Wölfelschneider)
87 #if !defined NO_AUTO_FILTER_SET
89 if (pcm_speed
>= 2 * 17897)
91 else if (pcm_speed
>= 2 * 15909)
93 else if (pcm_speed
>= 2 * 11931)
95 else if (pcm_speed
>= 2 * 8948)
97 else if (pcm_speed
>= 2 * 5965)
99 else if (pcm_speed
>= 2 * 2982)
107 pas_write(tmp
& ~(0x40 | 0x80), 0x0B8A);
108 pas_write(0x00 | 0x30 | 0x04, 0x138B);
109 pas_write(foo
& 0xff, 0x1388);
110 pas_write((foo
>> 8) & 0xff, 0x1388);
111 pas_write(tmp
, 0x0B8A);
113 restore_flags(flags
);
118 static int pcm_set_channels(int arg
)
121 if ((arg
!= 1) && (arg
!= 2))
124 if (arg
!= pcm_channels
)
126 pas_write(pas_read(0xF8A) ^ 0x20, 0xF8A);
129 pcm_set_speed(pcm_speed
); /* The speed must be reinitialized */
134 static int pcm_set_bits(int arg
)
139 if ((arg
& pcm_bitsok
) != arg
)
144 pas_write(pas_read(0x8389) ^ 0x04, 0x8389);
151 static int pas_audio_ioctl(int dev
, unsigned int cmd
, caddr_t arg
)
155 DEB(printk("pas2_pcm.c: static int pas_audio_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd
, arg
));
159 case SOUND_PCM_WRITE_RATE
:
160 if (get_user(val
, (int *)arg
))
162 ret
= pcm_set_speed(val
);
165 case SOUND_PCM_READ_RATE
:
169 case SNDCTL_DSP_STEREO
:
170 if (get_user(val
, (int *)arg
))
172 ret
= pcm_set_channels(val
+ 1) - 1;
175 case SOUND_PCM_WRITE_CHANNELS
:
176 if (get_user(val
, (int *)arg
))
178 ret
= pcm_set_channels(val
);
181 case SOUND_PCM_READ_CHANNELS
:
185 case SNDCTL_DSP_SETFMT
:
186 if (get_user(val
, (int *)arg
))
188 ret
= pcm_set_bits(val
);
191 case SOUND_PCM_READ_BITS
:
198 return put_user(ret
, (int *)arg
);
201 static void pas_audio_reset(int dev
)
203 DEB(printk("pas2_pcm.c: static void pas_audio_reset(void)\n"));
205 pas_write(pas_read(0xF8A) & ~0x40, 0xF8A); /* Disable PCM */
208 static int pas_audio_open(int dev
, int mode
)
213 DEB(printk("pas2_pcm.c: static int pas_audio_open(int mode = %X)\n", mode
));
219 restore_flags(flags
);
223 restore_flags(flags
);
225 if ((err
= pas_set_intr(PAS_PCM_INTRBITS
)) < 0)
235 static void pas_audio_close(int dev
)
239 DEB(printk("pas2_pcm.c: static void pas_audio_close(void)\n"));
244 pas_audio_reset(dev
);
245 pas_remove_intr(PAS_PCM_INTRBITS
);
249 restore_flags(flags
);
252 static void pas_audio_output_block(int dev
, unsigned long buf
, int count
,
255 unsigned long flags
, cnt
;
257 DEB(printk("pas2_pcm.c: static void pas_audio_output_block(char *buf = %P, int count = %X)\n", buf
, count
));
260 if (audio_devs
[dev
]->dmap_out
->dma
> 3)
263 if (audio_devs
[dev
]->flags
& DMA_AUTOMODE
&&
271 pas_write(pas_read(0xF8A) & ~0x40,
274 /* DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE); */
276 if (audio_devs
[dev
]->dmap_out
->dma
> 3)
279 if (count
!= pcm_count
)
281 pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
282 pas_write(0x40 | 0x30 | 0x04, 0x138B);
283 pas_write(count
& 0xff, 0x1389);
284 pas_write((count
>> 8) & 0xff, 0x1389);
285 pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
289 pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
291 pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
296 restore_flags(flags
);
299 static void pas_audio_start_input(int dev
, unsigned long buf
, int count
,
305 DEB(printk("pas2_pcm.c: static void pas_audio_start_input(char *buf = %P, int count = %X)\n", buf
, count
));
308 if (audio_devs
[dev
]->dmap_out
->dma
> 3)
311 if (audio_devs
[pas_audiodev
]->flags
& DMA_AUTOMODE
&&
319 /* DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ); */
321 if (audio_devs
[dev
]->dmap_out
->dma
> 3)
324 if (count
!= pcm_count
)
326 pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
327 pas_write(0x40 | 0x30 | 0x04, 0x138B);
328 pas_write(count
& 0xff, 0x1389);
329 pas_write((count
>> 8) & 0xff, 0x1389);
330 pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
334 pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
336 pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
341 restore_flags(flags
);
345 static void pas_audio_trigger(int dev
, int state
)
353 if (state
& PCM_ENABLE_OUTPUT
)
354 pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
355 else if (state
& PCM_ENABLE_INPUT
)
356 pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
358 pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
360 restore_flags(flags
);
364 static int pas_audio_prepare_for_input(int dev
, int bsize
, int bcount
)
366 pas_audio_reset(dev
);
370 static int pas_audio_prepare_for_output(int dev
, int bsize
, int bcount
)
372 pas_audio_reset(dev
);
376 static struct audio_driver pas_audio_driver
=
379 open
: pas_audio_open
,
380 close
: pas_audio_close
,
381 output_block
: pas_audio_output_block
,
382 start_input
: pas_audio_start_input
,
383 ioctl
: pas_audio_ioctl
,
384 prepare_for_input
: pas_audio_prepare_for_input
,
385 prepare_for_output
: pas_audio_prepare_for_output
,
386 halt_io
: pas_audio_reset
,
387 trigger
: pas_audio_trigger
390 void __init
pas_pcm_init(struct address_info
*hw_config
)
392 DEB(printk("pas2_pcm.c: long pas_pcm_init()\n"));
395 if (pas_read(0xEF8B) & 0x08)
398 pcm_set_speed(DSP_DEFAULT_SPEED
);
400 if ((pas_audiodev
= sound_install_audiodrv(AUDIO_DRIVER_VERSION
,
401 "Pro Audio Spectrum",
403 sizeof(struct audio_driver
),
405 AFMT_U8
| AFMT_S16_LE
,
408 hw_config
->dma
)) < 0)
409 printk(KERN_WARNING
"PAS16: Too many PCM devices available\n");
412 void pas_pcm_interrupt(unsigned char status
, int cause
)
417 * Halt the PCM first. Otherwise we don't have time to start a new
418 * block before the PCM chip proceeds to the next sample
421 if (!(audio_devs
[pas_audiodev
]->flags
& DMA_AUTOMODE
))
422 pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
427 DMAbuf_outputintr(pas_audiodev
, 1);
431 DMAbuf_inputintr(pas_audiodev
);
435 printk(KERN_WARNING
"PAS: Unexpected PCM interrupt\n");