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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sound/] [pas2_pcm.c] - Blame information for rev 1765

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#define _PAS2_PCM_C_
/*
 * sound/pas2_pcm.c
 *
 * The low level driver for the Pro Audio Spectrum ADC/DAC.
 */
 
#include <linux/config.h>
 
#include "sound_config.h"
 
#if defined(CONFIG_PAS) && defined(CONFIG_AUDIO)
 
#ifndef DEB
#define DEB(WHAT)
#endif
 
#define PAS_PCM_INTRBITS (0x08)
/*
 * Sample buffer timer interrupt enable
 */
 
#define PCM_NON 0
#define PCM_DAC 1
#define PCM_ADC 2
 
static unsigned long pcm_speed = 0;      /* sampling rate */
static unsigned char pcm_channels = 1;  /* channels (1 or 2) */
static unsigned char pcm_bits = 8;      /* bits/sample (8 or 16) */
static unsigned char pcm_filter = 0;     /* filter FLAG */
static unsigned char pcm_mode = PCM_NON;
static unsigned long pcm_count = 0;
static unsigned short pcm_bitsok = 8;   /* mask of OK bits */
static int      pcm_busy = 0;
int             pas_audiodev = 0;
static int      open_mode = 0;
 
int
pcm_set_speed (int arg)
{
  int             foo, tmp;
  unsigned long   flags;
 
  if (arg == 0)
     return pcm_speed;
 
  if (arg > 44100)
    arg = 44100;
  if (arg < 5000)
    arg = 5000;
 
  if (pcm_channels & 2)
    {
      foo = (596590 + (arg / 2)) / arg;
      arg = 596590 / foo;
    }
  else
    {
      foo = (1193180 + (arg / 2)) / arg;
      arg = 1193180 / foo;
    }
 
  pcm_speed = arg;
 
  tmp = pas_read (0x0B8A);
 
  /*
     * Set anti-aliasing filters according to sample rate. You really *NEED*
     * to enable this feature for all normal recording unless you want to
     * experiment with aliasing effects.
     * These filters apply to the selected "recording" source.
     * I (pfw) don't know the encoding of these 5 bits. The values shown
     * come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.
     *
     * I cleared bit 5 of these values, since that bit controls the master
     * mute flag. (Olav W�lfelschneider)
     *
   */
#if !defined NO_AUTO_FILTER_SET
  tmp &= 0xe0;
  if (pcm_speed >= 2 * 17897)
    tmp |= 0x01;
  else if (pcm_speed >= 2 * 15909)
    tmp |= 0x02;
  else if (pcm_speed >= 2 * 11931)
    tmp |= 0x09;
  else if (pcm_speed >= 2 * 8948)
    tmp |= 0x11;
  else if (pcm_speed >= 2 * 5965)
    tmp |= 0x19;
  else if (pcm_speed >= 2 * 2982)
    tmp |= 0x04;
  pcm_filter = tmp;
#endif
 
  save_flags (flags);
  cli ();
 
  pas_write (tmp & ~(0x40 | 0x80), 0x0B8A);
  pas_write (0x00 | 0x30 | 0x04, 0x138B);
  pas_write (foo & 0xff, 0x1388);
  pas_write ((foo >> 8) & 0xff, 0x1388);
  pas_write (tmp, 0x0B8A);
 
  restore_flags (flags);
 
  return pcm_speed;
}
 
int
pcm_set_channels (int arg)
{
 
  if ((arg != 1) && (arg != 2))
    return pcm_channels;
 
  if (arg != pcm_channels)
    {
      pas_write (pas_read (0xF8A) ^ 0x20, 0xF8A);
 
      pcm_channels = arg;
      pcm_set_speed (pcm_speed);        /*
                                           * The speed must be reinitialized
                                         */
    }
 
  return pcm_channels;
}
 
int
pcm_set_bits (int arg)
{
  if (arg == 0)
     return pcm_bits;
 
  if ((arg & pcm_bitsok) != arg)
    return pcm_bits;
 
  if (arg != pcm_bits)
    {
      pas_write (pas_read (0x8389) ^ 0x04, 0x8389);
 
      pcm_bits = arg;
    }
 
  return pcm_bits;
}
 
static int
pas_audio_ioctl (int dev, unsigned int cmd, caddr_t arg, int local)
{
  DEB (printk ("pas2_pcm.c: static int pas_audio_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd, arg));
 
  switch (cmd)
    {
    case SOUND_PCM_WRITE_RATE:
      if (local)
        return pcm_set_speed ((int) arg);
      return snd_ioctl_return ((int *) arg, pcm_set_speed (get_user ((int *) arg)));
      break;
 
    case SOUND_PCM_READ_RATE:
      if (local)
        return pcm_speed;
      return snd_ioctl_return ((int *) arg, pcm_speed);
      break;
 
    case SNDCTL_DSP_STEREO:
      if (local)
        return pcm_set_channels ((int) arg + 1) - 1;
      return snd_ioctl_return ((int *) arg, pcm_set_channels (get_user ((int *) arg) + 1) - 1);
      break;
 
    case SOUND_PCM_WRITE_CHANNELS:
      if (local)
        return pcm_set_channels ((int) arg);
      return snd_ioctl_return ((int *) arg, pcm_set_channels (get_user ((int *) arg)));
      break;
 
    case SOUND_PCM_READ_CHANNELS:
      if (local)
        return pcm_channels;
      return snd_ioctl_return ((int *) arg, pcm_channels);
      break;
 
    case SNDCTL_DSP_SETFMT:
      if (local)
        return pcm_set_bits ((int) arg);
      return snd_ioctl_return ((int *) arg, pcm_set_bits (get_user ((int *) arg)));
      break;
 
    case SOUND_PCM_READ_BITS:
      if (local)
        return pcm_bits;
      return snd_ioctl_return ((int *) arg, pcm_bits);
 
    case SOUND_PCM_WRITE_FILTER:        /*
                                         * NOT YET IMPLEMENTED
                                         */
      if (get_user ((int *) arg) > 1)
        return -(EINVAL);
      pcm_filter = get_user ((int *) arg);
      break;
 
    case SOUND_PCM_READ_FILTER:
      return snd_ioctl_return ((int *) arg, pcm_filter);
      break;
 
    default:
      return -(EINVAL);
    }
 
  return -(EINVAL);
}
 
static void
pas_audio_reset (int dev)
{
  DEB (printk ("pas2_pcm.c: static void pas_audio_reset(void)\n"));
 
  pas_write (pas_read (0xF8A) & ~0x40, 0xF8A);
}
 
static int
pas_audio_open (int dev, int mode)
{
  int             err;
  unsigned long   flags;
 
  DEB (printk ("pas2_pcm.c: static int pas_audio_open(int mode = %X)\n", mode));
 
  save_flags (flags);
  cli ();
  if (pcm_busy)
    {
      restore_flags (flags);
      return -(EBUSY);
    }
 
  pcm_busy = 1;
  restore_flags (flags);
 
  if ((err = pas_set_intr (PAS_PCM_INTRBITS)) < 0)
    return err;
 
 
  pcm_count = 0;
  open_mode = mode;
 
  return 0;
}
 
static void
pas_audio_close (int dev)
{
  unsigned long   flags;
 
  DEB (printk ("pas2_pcm.c: static void pas_audio_close(void)\n"));
 
  save_flags (flags);
  cli ();
 
  pas_audio_reset (dev);
  pas_remove_intr (PAS_PCM_INTRBITS);
  pcm_mode = PCM_NON;
 
  pcm_busy = 0;
  restore_flags (flags);
}
 
static void
pas_audio_output_block (int dev, unsigned long buf, int count,
                        int intrflag, int restart_dma)
{
  unsigned long   flags, cnt;
 
  DEB (printk ("pas2_pcm.c: static void pas_audio_output_block(char *buf = %P, int count = %X)\n", buf, count));
 
  cnt = count;
  if (audio_devs[dev]->dmachan1 > 3)
    cnt >>= 1;
 
  if (audio_devs[dev]->flags & DMA_AUTOMODE &&
      intrflag &&
      cnt == pcm_count)
    return;                     /*
                                 * Auto mode on. No need to react
                                 */
 
  save_flags (flags);
  cli ();
 
  pas_write (pas_read (0xF8A) & ~0x40,
             0xF8A);
 
  if (restart_dma)
    DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE);
 
  if (audio_devs[dev]->dmachan1 > 3)
    count >>= 1;
 
  if (count != pcm_count)
    {
      pas_write (pas_read (0x0B8A) & ~0x80, 0x0B8A);
      pas_write (0x40 | 0x30 | 0x04, 0x138B);
      pas_write (count & 0xff, 0x1389);
      pas_write ((count >> 8) & 0xff, 0x1389);
      pas_write (pas_read (0x0B8A) | 0x80, 0x0B8A);
 
      pcm_count = count;
    }
  pas_write (pas_read (0x0B8A) | 0x80 | 0x40, 0x0B8A);
#ifdef NO_TRIGGER
  pas_write (pas_read (0xF8A) | 0x40 | 0x10, 0xF8A);
#endif
 
  pcm_mode = PCM_DAC;
 
  restore_flags (flags);
}
 
static void
pas_audio_start_input (int dev, unsigned long buf, int count,
                       int intrflag, int restart_dma)
{
  unsigned long   flags;
  int             cnt;
 
  DEB (printk ("pas2_pcm.c: static void pas_audio_start_input(char *buf = %P, int count = %X)\n", buf, count));
 
  cnt = count;
  if (audio_devs[dev]->dmachan1 > 3)
    cnt >>= 1;
 
  if (audio_devs[pas_audiodev]->flags & DMA_AUTOMODE &&
      intrflag &&
      cnt == pcm_count)
    return;                     /*
                                 * Auto mode on. No need to react
                                 */
 
  save_flags (flags);
  cli ();
 
  if (restart_dma)
    DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ);
 
  if (audio_devs[dev]->dmachan1 > 3)
    count >>= 1;
 
  if (count != pcm_count)
    {
      pas_write (pas_read (0x0B8A) & ~0x80, 0x0B8A);
      pas_write (0x40 | 0x30 | 0x04, 0x138B);
      pas_write (count & 0xff, 0x1389);
      pas_write ((count >> 8) & 0xff, 0x1389);
      pas_write (pas_read (0x0B8A) | 0x80, 0x0B8A);
 
      pcm_count = count;
    }
  pas_write (pas_read (0x0B8A) | 0x80 | 0x40, 0x0B8A);
#ifdef NO_TRIGGER
  pas_write ((pas_read (0xF8A) | 0x40) & ~0x10, 0xF8A);
#endif
 
  pcm_mode = PCM_ADC;
 
  restore_flags (flags);
}
 
#ifndef NO_TRIGGER
static void
pas_audio_trigger (int dev, int state)
{
  unsigned long   flags;
 
  save_flags (flags);
  cli ();
  state &= open_mode;
 
  if (state & PCM_ENABLE_OUTPUT)
    pas_write (pas_read (0xF8A) | 0x40 | 0x10, 0xF8A);
  else if (state & PCM_ENABLE_INPUT)
    pas_write ((pas_read (0xF8A) | 0x40) & ~0x10, 0xF8A);
  else
    pas_write (pas_read (0xF8A) & ~0x40, 0xF8A);
 
  restore_flags (flags);
}
#endif
 
static int
pas_audio_prepare_for_input (int dev, int bsize, int bcount)
{
  return 0;
}
 
static int
pas_audio_prepare_for_output (int dev, int bsize, int bcount)
{
  return 0;
}
 
static struct audio_driver pas_audio_driver =
{
  pas_audio_open,
  pas_audio_close,
  pas_audio_output_block,
  pas_audio_start_input,
  pas_audio_ioctl,
  pas_audio_prepare_for_input,
  pas_audio_prepare_for_output,
  pas_audio_reset,
  pas_audio_reset,
  NULL,
  NULL,
  NULL,
  NULL,
  pas_audio_trigger
};
 
static struct audio_operations pas_audio_operations =
{
  "Pro Audio Spectrum",
  DMA_AUTOMODE,
  AFMT_U8 | AFMT_S16_LE,
  NULL,
  &pas_audio_driver
};
 
void
pas_pcm_init (struct address_info *hw_config)
{
  DEB (printk ("pas2_pcm.c: long pas_pcm_init()\n"));
 
  pcm_bitsok = 8;
  if (pas_read (0xEF8B) & 0x08)
    pcm_bitsok |= 16;
 
  pcm_set_speed (DSP_DEFAULT_SPEED);
 
  if (num_audiodevs < MAX_AUDIO_DEV)
    {
      audio_devs[pas_audiodev = num_audiodevs++] = &pas_audio_operations;
      audio_devs[pas_audiodev]->dmachan1 = hw_config->dma;
      audio_devs[pas_audiodev]->buffsize = DSP_BUFFSIZE;
    }
  else
    printk ("PAS2: Too many PCM devices available\n");
}
 
void
pas_pcm_interrupt (unsigned char status, int cause)
{
  if (cause == 1)               /*
                                 * PCM buffer done
                                 */
    {
      /*
       * Halt the PCM first. Otherwise we don't have time to start a new
       * block before the PCM chip proceeds to the next sample
       */
 
      if (!(audio_devs[pas_audiodev]->flags & DMA_AUTOMODE))
        {
          pas_write (pas_read (0xF8A) & ~0x40,
                     0xF8A);
        }
 
      switch (pcm_mode)
        {
 
        case PCM_DAC:
          DMAbuf_outputintr (pas_audiodev, 1);
          break;
 
        case PCM_ADC:
          DMAbuf_inputintr (pas_audiodev);
          break;
 
        default:
          printk ("PAS: Unexpected PCM interrupt\n");
        }
    }
}
 
#endif

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sound/] [pas2_pcm.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1626	jcastillo	`#define _PAS2_PCM_C_`
2			`/*`
3			`* sound/pas2_pcm.c`
4			`*`
5			`* The low level driver for the Pro Audio Spectrum ADC/DAC.`
6			`*/`
7
8			`#include <linux/config.h>`
9
10			`#include "sound_config.h"`
11
12			`#if defined(CONFIG_PAS) && defined(CONFIG_AUDIO)`
13
14			`#ifndef DEB`
15			`#define DEB(WHAT)`
16			`#endif`
17
18			`#define PAS_PCM_INTRBITS (0x08)`
19			`/*`
20			`* Sample buffer timer interrupt enable`
21			`*/`
22
23			`#define PCM_NON 0`
24			`#define PCM_DAC 1`
25			`#define PCM_ADC 2`
26
27			`static unsigned long pcm_speed = 0; /* sampling rate */`
28			`static unsigned char pcm_channels = 1; /* channels (1 or 2) */`
29			`static unsigned char pcm_bits = 8; /* bits/sample (8 or 16) */`
30			`static unsigned char pcm_filter = 0; /* filter FLAG */`
31			`static unsigned char pcm_mode = PCM_NON;`
32			`static unsigned long pcm_count = 0;`
33			`static unsigned short pcm_bitsok = 8; /* mask of OK bits */`
34			`static int pcm_busy = 0;`
35			`int pas_audiodev = 0;`
36			`static int open_mode = 0;`
37
38			`int`
39			`pcm_set_speed (int arg)`
40			`{`
41			`int foo, tmp;`
42			`unsigned long flags;`
43
44			`if (arg == 0)`
45			`return pcm_speed;`
46
47			`if (arg > 44100)`
48			`arg = 44100;`
49			`if (arg < 5000)`
50			`arg = 5000;`
51
52			`if (pcm_channels & 2)`
53			`{`
54			`foo = (596590 + (arg / 2)) / arg;`
55			`arg = 596590 / foo;`
56			`}`
57			`else`
58			`{`
59			`foo = (1193180 + (arg / 2)) / arg;`
60			`arg = 1193180 / foo;`
61			`}`
62
63			`pcm_speed = arg;`
64
65			`tmp = pas_read (0x0B8A);`
66
67			`/*`
68			`* Set anti-aliasing filters according to sample rate. You really NEED`
69			`* to enable this feature for all normal recording unless you want to`
70			`* experiment with aliasing effects.`
71			`* These filters apply to the selected "recording" source.`
72			`* I (pfw) don't know the encoding of these 5 bits. The values shown`
73			`* come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.`
74			`*`
75			`* I cleared bit 5 of these values, since that bit controls the master`
76			`* mute flag. (Olav W�lfelschneider)`
77			`*`
78			`*/`
79			`#if !defined NO_AUTO_FILTER_SET`
80			`tmp &= 0xe0;`
81			`if (pcm_speed >= 2 * 17897)`
82			`tmp \|= 0x01;`
83			`else if (pcm_speed >= 2 * 15909)`
84			`tmp \|= 0x02;`
85			`else if (pcm_speed >= 2 * 11931)`
86			`tmp \|= 0x09;`
87			`else if (pcm_speed >= 2 * 8948)`
88			`tmp \|= 0x11;`
89			`else if (pcm_speed >= 2 * 5965)`
90			`tmp \|= 0x19;`
91			`else if (pcm_speed >= 2 * 2982)`
92			`tmp \|= 0x04;`
93			`pcm_filter = tmp;`
94			`#endif`
95
96			`save_flags (flags);`
97			`cli ();`
98
99			`pas_write (tmp & ~(0x40 \| 0x80), 0x0B8A);`
100			`pas_write (0x00 \| 0x30 \| 0x04, 0x138B);`
101			`pas_write (foo & 0xff, 0x1388);`
102			`pas_write ((foo >> 8) & 0xff, 0x1388);`
103			`pas_write (tmp, 0x0B8A);`
104
105			`restore_flags (flags);`
106
107			`return pcm_speed;`
108			`}`
109
110			`int`
111			`pcm_set_channels (int arg)`
112			`{`
113
114			`if ((arg != 1) && (arg != 2))`
115			`return pcm_channels;`
116
117			`if (arg != pcm_channels)`
118			`{`
119			`pas_write (pas_read (0xF8A) ^ 0x20, 0xF8A);`
120
121			`pcm_channels = arg;`
122			`pcm_set_speed (pcm_speed); /*`
123			`* The speed must be reinitialized`
124			`*/`
125			`}`
126
127			`return pcm_channels;`
128			`}`
129
130			`int`
131			`pcm_set_bits (int arg)`
132			`{`
133			`if (arg == 0)`
134			`return pcm_bits;`
135
136			`if ((arg & pcm_bitsok) != arg)`
137			`return pcm_bits;`
138
139			`if (arg != pcm_bits)`
140			`{`
141			`pas_write (pas_read (0x8389) ^ 0x04, 0x8389);`
142
143			`pcm_bits = arg;`
144			`}`
145
146			`return pcm_bits;`
147			`}`
148
149			`static int`
150			`pas_audio_ioctl (int dev, unsigned int cmd, caddr_t arg, int local)`
151			`{`
152			`DEB (printk ("pas2_pcm.c: static int pas_audio_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd, arg));`
153
154			`switch (cmd)`
155			`{`
156			`case SOUND_PCM_WRITE_RATE:`
157			`if (local)`
158			`return pcm_set_speed ((int) arg);`
159			`return snd_ioctl_return ((int ) arg, pcm_set_speed (get_user ((int ) arg)));`
160			`break;`
161
162			`case SOUND_PCM_READ_RATE:`
163			`if (local)`
164			`return pcm_speed;`
165			`return snd_ioctl_return ((int *) arg, pcm_speed);`
166			`break;`
167
168			`case SNDCTL_DSP_STEREO:`
169			`if (local)`
170			`return pcm_set_channels ((int) arg + 1) - 1;`
171			`return snd_ioctl_return ((int ) arg, pcm_set_channels (get_user ((int ) arg) + 1) - 1);`
172			`break;`
173
174			`case SOUND_PCM_WRITE_CHANNELS:`
175			`if (local)`
176			`return pcm_set_channels ((int) arg);`
177			`return snd_ioctl_return ((int ) arg, pcm_set_channels (get_user ((int ) arg)));`
178			`break;`
179
180			`case SOUND_PCM_READ_CHANNELS:`
181			`if (local)`
182			`return pcm_channels;`
183			`return snd_ioctl_return ((int *) arg, pcm_channels);`
184			`break;`
185
186			`case SNDCTL_DSP_SETFMT:`
187			`if (local)`
188			`return pcm_set_bits ((int) arg);`
189			`return snd_ioctl_return ((int ) arg, pcm_set_bits (get_user ((int ) arg)));`
190			`break;`
191
192			`case SOUND_PCM_READ_BITS:`
193			`if (local)`
194			`return pcm_bits;`
195			`return snd_ioctl_return ((int *) arg, pcm_bits);`
196
197			`case SOUND_PCM_WRITE_FILTER: /*`
198			`* NOT YET IMPLEMENTED`
199			`*/`
200			`if (get_user ((int *) arg) > 1)`
201			`return -(EINVAL);`
202			`pcm_filter = get_user ((int *) arg);`
203			`break;`
204
205			`case SOUND_PCM_READ_FILTER:`
206			`return snd_ioctl_return ((int *) arg, pcm_filter);`
207			`break;`
208
209			`default:`
210			`return -(EINVAL);`
211			`}`
212
213			`return -(EINVAL);`
214			`}`
215
216			`static void`
217			`pas_audio_reset (int dev)`
218			`{`
219			`DEB (printk ("pas2_pcm.c: static void pas_audio_reset(void)\n"));`
220
221			`pas_write (pas_read (0xF8A) & ~0x40, 0xF8A);`
222			`}`
223
224			`static int`
225			`pas_audio_open (int dev, int mode)`
226			`{`
227			`int err;`
228			`unsigned long flags;`
229
230			`DEB (printk ("pas2_pcm.c: static int pas_audio_open(int mode = %X)\n", mode));`
231
232			`save_flags (flags);`
233			`cli ();`
234			`if (pcm_busy)`
235			`{`
236			`restore_flags (flags);`
237			`return -(EBUSY);`
238			`}`
239
240			`pcm_busy = 1;`
241			`restore_flags (flags);`
242
243			`if ((err = pas_set_intr (PAS_PCM_INTRBITS)) < 0)`
244			`return err;`
245
246
247			`pcm_count = 0;`
248			`open_mode = mode;`
249
250			`return 0;`
251			`}`
252
253			`static void`
254			`pas_audio_close (int dev)`
255			`{`
256			`unsigned long flags;`
257
258			`DEB (printk ("pas2_pcm.c: static void pas_audio_close(void)\n"));`
259
260			`save_flags (flags);`
261			`cli ();`
262
263			`pas_audio_reset (dev);`
264			`pas_remove_intr (PAS_PCM_INTRBITS);`
265			`pcm_mode = PCM_NON;`
266
267			`pcm_busy = 0;`
268			`restore_flags (flags);`
269			`}`
270
271			`static void`
272			`pas_audio_output_block (int dev, unsigned long buf, int count,`
273			`int intrflag, int restart_dma)`
274			`{`
275			`unsigned long flags, cnt;`
276
277			`DEB (printk ("pas2_pcm.c: static void pas_audio_output_block(char *buf = %P, int count = %X)\n", buf, count));`
278
279			`cnt = count;`
280			`if (audio_devs[dev]->dmachan1 > 3)`
281			`cnt >>= 1;`
282
283			`if (audio_devs[dev]->flags & DMA_AUTOMODE &&`
284			`intrflag &&`
285			`cnt == pcm_count)`
286			`return; /*`
287			`* Auto mode on. No need to react`
288			`*/`
289
290			`save_flags (flags);`
291			`cli ();`
292
293			`pas_write (pas_read (0xF8A) & ~0x40,`
294			`0xF8A);`
295
296			`if (restart_dma)`
297			`DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE);`
298
299			`if (audio_devs[dev]->dmachan1 > 3)`
300			`count >>= 1;`
301
302			`if (count != pcm_count)`
303			`{`
304			`pas_write (pas_read (0x0B8A) & ~0x80, 0x0B8A);`
305			`pas_write (0x40 \| 0x30 \| 0x04, 0x138B);`
306			`pas_write (count & 0xff, 0x1389);`
307			`pas_write ((count >> 8) & 0xff, 0x1389);`
308			`pas_write (pas_read (0x0B8A) \| 0x80, 0x0B8A);`
309
310			`pcm_count = count;`
311			`}`
312			`pas_write (pas_read (0x0B8A) \| 0x80 \| 0x40, 0x0B8A);`
313			`#ifdef NO_TRIGGER`
314			`pas_write (pas_read (0xF8A) \| 0x40 \| 0x10, 0xF8A);`
315			`#endif`
316
317			`pcm_mode = PCM_DAC;`
318
319			`restore_flags (flags);`
320			`}`
321
322			`static void`
323			`pas_audio_start_input (int dev, unsigned long buf, int count,`
324			`int intrflag, int restart_dma)`
325			`{`
326			`unsigned long flags;`
327			`int cnt;`
328
329			`DEB (printk ("pas2_pcm.c: static void pas_audio_start_input(char *buf = %P, int count = %X)\n", buf, count));`
330
331			`cnt = count;`
332			`if (audio_devs[dev]->dmachan1 > 3)`
333			`cnt >>= 1;`
334
335			`if (audio_devs[pas_audiodev]->flags & DMA_AUTOMODE &&`
336			`intrflag &&`
337			`cnt == pcm_count)`
338			`return; /*`
339			`* Auto mode on. No need to react`
340			`*/`
341
342			`save_flags (flags);`
343			`cli ();`
344
345			`if (restart_dma)`
346			`DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ);`
347
348			`if (audio_devs[dev]->dmachan1 > 3)`
349			`count >>= 1;`
350
351			`if (count != pcm_count)`
352			`{`
353			`pas_write (pas_read (0x0B8A) & ~0x80, 0x0B8A);`
354			`pas_write (0x40 \| 0x30 \| 0x04, 0x138B);`
355			`pas_write (count & 0xff, 0x1389);`
356			`pas_write ((count >> 8) & 0xff, 0x1389);`
357			`pas_write (pas_read (0x0B8A) \| 0x80, 0x0B8A);`
358
359			`pcm_count = count;`
360			`}`
361			`pas_write (pas_read (0x0B8A) \| 0x80 \| 0x40, 0x0B8A);`
362			`#ifdef NO_TRIGGER`
363			`pas_write ((pas_read (0xF8A) \| 0x40) & ~0x10, 0xF8A);`
364			`#endif`
365
366			`pcm_mode = PCM_ADC;`
367
368			`restore_flags (flags);`
369			`}`
370
371			`#ifndef NO_TRIGGER`
372			`static void`
373			`pas_audio_trigger (int dev, int state)`
374			`{`
375			`unsigned long flags;`
376
377			`save_flags (flags);`
378			`cli ();`
379			`state &= open_mode;`
380
381			`if (state & PCM_ENABLE_OUTPUT)`
382			`pas_write (pas_read (0xF8A) \| 0x40 \| 0x10, 0xF8A);`
383			`else if (state & PCM_ENABLE_INPUT)`
384			`pas_write ((pas_read (0xF8A) \| 0x40) & ~0x10, 0xF8A);`
385			`else`
386			`pas_write (pas_read (0xF8A) & ~0x40, 0xF8A);`
387
388			`restore_flags (flags);`
389			`}`
390			`#endif`
391
392			`static int`
393			`pas_audio_prepare_for_input (int dev, int bsize, int bcount)`
394			`{`
395			`return 0;`
396			`}`
397
398			`static int`
399			`pas_audio_prepare_for_output (int dev, int bsize, int bcount)`
400			`{`
401			`return 0;`
402			`}`
403
404			`static struct audio_driver pas_audio_driver =`
405			`{`
406			`pas_audio_open,`
407			`pas_audio_close,`
408			`pas_audio_output_block,`
409			`pas_audio_start_input,`
410			`pas_audio_ioctl,`
411			`pas_audio_prepare_for_input,`
412			`pas_audio_prepare_for_output,`
413			`pas_audio_reset,`
414			`pas_audio_reset,`
415			`NULL,`
416			`NULL,`
417			`NULL,`
418			`NULL,`
419			`pas_audio_trigger`
420			`};`
421
422			`static struct audio_operations pas_audio_operations =`
423			`{`
424			`"Pro Audio Spectrum",`
425			`DMA_AUTOMODE,`
426			`AFMT_U8 \| AFMT_S16_LE,`
427			`NULL,`
428			`&pas_audio_driver`
429			`};`
430
431			`void`
432			`pas_pcm_init (struct address_info *hw_config)`
433			`{`
434			`DEB (printk ("pas2_pcm.c: long pas_pcm_init()\n"));`
435
436			`pcm_bitsok = 8;`
437			`if (pas_read (0xEF8B) & 0x08)`
438			`pcm_bitsok \|= 16;`
439
440			`pcm_set_speed (DSP_DEFAULT_SPEED);`
441
442			`if (num_audiodevs < MAX_AUDIO_DEV)`
443			`{`
444			`audio_devs[pas_audiodev = num_audiodevs++] = &pas_audio_operations;`
445			`audio_devs[pas_audiodev]->dmachan1 = hw_config->dma;`
446			`audio_devs[pas_audiodev]->buffsize = DSP_BUFFSIZE;`
447			`}`
448			`else`
449			`printk ("PAS2: Too many PCM devices available\n");`
450			`}`
451
452			`void`
453			`pas_pcm_interrupt (unsigned char status, int cause)`
454			`{`
455			`if (cause == 1) /*`
456			`* PCM buffer done`
457			`*/`
458			`{`
459			`/*`
460			`* Halt the PCM first. Otherwise we don't have time to start a new`
461			`* block before the PCM chip proceeds to the next sample`
462			`*/`
463
464			`if (!(audio_devs[pas_audiodev]->flags & DMA_AUTOMODE))`
465			`{`
466			`pas_write (pas_read (0xF8A) & ~0x40,`
467			`0xF8A);`
468			`}`
469
470			`switch (pcm_mode)`
471			`{`
472
473			`case PCM_DAC:`
474			`DMAbuf_outputintr (pas_audiodev, 1);`
475			`break;`
476
477			`case PCM_ADC:`
478			`DMAbuf_inputintr (pas_audiodev);`
479			`break;`
480
481			`default:`
482			`printk ("PAS: Unexpected PCM interrupt\n");`
483			`}`
484			`}`
485			`}`
486
487			`#endif`