URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

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

Details | Compare with Previous | View Log


 
/*
 * sound/sb_mixer.c
 *
 * The low level mixer driver for the Sound Blaster compatible cards.
 */
/*
 * Copyright (C) by Hannu Savolainen 1993-1996
 *
 * USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */
#include <linux/config.h>
 
 
#include "sound_config.h"
 
#if defined(CONFIG_SBDSP)
#define __SB_MIXER_C__
 
#include "sb.h"
#include "sb_mixer.h"
 
void            sb_mixer_reset (sb_devc * devc);
 
void
sb_mixer_set_stereo (sb_devc * devc, int mode)
{
  sb_setmixer (devc, OUT_FILTER, ((sb_getmixer (devc, OUT_FILTER) & ~STEREO_DAC)
                                  | (mode ? STEREO_DAC : MONO_DAC)));
}
 
static int
detect_mixer (sb_devc * devc)
{
  /*
   * Detect the mixer by changing parameters of two volume channels. If the
   * values read back match with the values written, the mixer is there (is
   * it?)
   */
  sb_setmixer (devc, FM_VOL, 0xff);
  sb_setmixer (devc, VOC_VOL, 0x33);
 
  if (sb_getmixer (devc, FM_VOL) != 0xff)
    return 0;
  if (sb_getmixer (devc, VOC_VOL) != 0x33)
    return 0;
 
  return 1;
}
 
static void
change_bits (sb_devc * devc, unsigned char *regval, int dev, int chn, int newval)
{
  unsigned char   mask;
  int             shift;
 
  mask = (1 << (*devc->iomap)[dev][chn].nbits) - 1;
  newval = (int) ((newval * mask) + 50) / 100;  /* Scale */
 
  shift = (*devc->iomap)[dev][chn].bitoffs - (*devc->iomap)[dev][LEFT_CHN].nbits + 1;
 
  *regval &= ~(mask << shift);  /* Mask out previous value */
  *regval |= (newval & mask) << shift;  /* Set the new value */
}
 
static int
sb_mixer_get (sb_devc * devc, int dev)
{
  if (!((1 << dev) & devc->supported_devices))
    return -(EINVAL);
 
  return devc->levels[dev];
}
 
void
smw_mixer_init (sb_devc * devc)
{
  int             i;
 
  sb_setmixer (devc, 0x00, 0x18);       /* Mute unused (Telephone) line */
  sb_setmixer (devc, 0x10, 0x38);       /* Config register 2 */
 
  devc->supported_devices = 0;
  for (i = 0; i < sizeof (smw_mix_regs); i++)
    if (smw_mix_regs[i] != 0)
      devc->supported_devices |= (1 << i);
 
  devc->supported_rec_devices = devc->supported_devices &
    ~(SOUND_MASK_BASS | SOUND_MASK_TREBLE | SOUND_MASK_PCM |
      SOUND_MASK_VOLUME);
 
  sb_mixer_reset (devc);
}
 
static int
smw_mixer_set (sb_devc * devc, int dev, int value)
{
  int             left = value & 0x000000ff;
  int             right = (value & 0x0000ff00) >> 8;
  int             reg, val;
 
  if (left > 100)
    left = 100;
  if (right > 100)
    right = 100;
 
  if (dev > 31)
    return -(EINVAL);
 
  if (!(devc->supported_devices & (1 << dev)))  /* Not supported */
    return -(EINVAL);
 
  switch (dev)
    {
    case SOUND_MIXER_VOLUME:
      sb_setmixer (devc, 0x0b, 96 - (96 * left / 100));         /* 96=mute, 0=max */
      sb_setmixer (devc, 0x0c, 96 - (96 * right / 100));
      break;
 
    case SOUND_MIXER_BASS:
    case SOUND_MIXER_TREBLE:
      devc->levels[dev] = left | (right << 8);
 
      /* Set left bass and treble values */
      val = ((devc->levels[SOUND_MIXER_TREBLE] & 0xff) * 16 / (unsigned) 100) << 4;
      val |= ((devc->levels[SOUND_MIXER_BASS] & 0xff) * 16 / (unsigned) 100) & 0x0f;
      sb_setmixer (devc, 0x0d, val);
 
      /* Set right bass and treble values */
      val = (((devc->levels[SOUND_MIXER_TREBLE] >> 8) & 0xff) * 16 / (unsigned) 100) << 4;
      val |= (((devc->levels[SOUND_MIXER_BASS] >> 8) & 0xff) * 16 / (unsigned) 100) & 0x0f;
      sb_setmixer (devc, 0x0e, val);
      break;
 
    default:
      reg = smw_mix_regs[dev];
      if (reg == 0)
        return -(EINVAL);
      sb_setmixer (devc, reg, (24 - (24 * left / 100)) | 0x20);         /* 24=mute, 0=max */
      sb_setmixer (devc, reg + 1, (24 - (24 * right / 100)) | 0x40);
    }
 
  devc->levels[dev] = left | (right << 8);
  return left | (right << 8);
}
 
static int
sb_mixer_set (sb_devc * devc, int dev, int value)
{
  int             left = value & 0x000000ff;
  int             right = (value & 0x0000ff00) >> 8;
 
  int             regoffs;
  unsigned char   val;
 
  if (devc->model == MDL_SMW)
    return smw_mixer_set (devc, dev, value);
 
  if (left > 100)
    left = 100;
  if (right > 100)
    right = 100;
 
  if (dev > 31)
    return -(EINVAL);
 
  if (!(devc->supported_devices & (1 << dev)))  /*
                                                 * Not supported
                                                 */
    return -(EINVAL);
 
  regoffs = (*devc->iomap)[dev][LEFT_CHN].regno;
 
  if (regoffs == 0)
    return -(EINVAL);
 
  val = sb_getmixer (devc, regoffs);
  change_bits (devc, &val, dev, LEFT_CHN, left);
 
  devc->levels[dev] = left | (left << 8);
 
  if ((*devc->iomap)[dev][RIGHT_CHN].regno != regoffs)  /*
                                                         * Change register
                                                         */
    {
      sb_setmixer (devc, regoffs, val);         /*
                                                 * Save the old one
                                                 */
      regoffs = (*devc->iomap)[dev][RIGHT_CHN].regno;
 
      if (regoffs == 0)
        return left | (left << 8);      /*
                                         * Just left channel present
                                         */
 
      val = sb_getmixer (devc, regoffs);        /*
                                                   * Read the new one
                                                 */
    }
 
  change_bits (devc, &val, dev, RIGHT_CHN, right);
 
  sb_setmixer (devc, regoffs, val);
 
  devc->levels[dev] = left | (right << 8);
  return left | (right << 8);
}
 
static void
set_recsrc (sb_devc * devc, int src)
{
  sb_setmixer (devc, RECORD_SRC, (sb_getmixer (devc, RECORD_SRC) & ~7) | (src & 0x7));
}
 
static int
set_recmask (sb_devc * devc, int mask)
{
  int             devmask, i;
  unsigned char   regimageL, regimageR;
 
  devmask = mask & devc->supported_rec_devices;
 
  switch (devc->model)
    {
    case MDL_SBPRO:
    case MDL_ESS:
    case MDL_JAZZ:
    case MDL_SMW:
 
      if (devmask != SOUND_MASK_MIC &&
          devmask != SOUND_MASK_LINE &&
          devmask != SOUND_MASK_CD)
        {                       /*
                                 * More than one devices selected. Drop the *
                                 * previous selection
                                 */
          devmask &= ~devc->recmask;
        }
 
      if (devmask != SOUND_MASK_MIC &&
          devmask != SOUND_MASK_LINE &&
          devmask != SOUND_MASK_CD)
        {                       /*
                                 * More than one devices selected. Default to
                                 * * mic
                                 */
          devmask = SOUND_MASK_MIC;
        }
 
 
      if (devmask ^ devc->recmask)      /*
                                           * Input source changed
                                         */
        {
          switch (devmask)
            {
 
            case SOUND_MASK_MIC:
              set_recsrc (devc, SRC__MIC);
              break;
 
            case SOUND_MASK_LINE:
              set_recsrc (devc, SRC__LINE);
              break;
 
            case SOUND_MASK_CD:
              set_recsrc (devc, SRC__CD);
              break;
 
            default:
              set_recsrc (devc, SRC__MIC);
            }
        }
 
      break;
 
    case MDL_SB16:
      if (!devmask)
        devmask = SOUND_MASK_MIC;
 
      regimageL = regimageR = 0;
      for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
        if ((1 << i) & devmask)
          {
            regimageL |= sb16_recmasks_L[i];
            regimageR |= sb16_recmasks_R[i];
          }
      sb_setmixer (devc, SB16_IMASK_L, regimageL);
      sb_setmixer (devc, SB16_IMASK_R, regimageR);
      break;
    }
 
  devc->recmask = devmask;
  return devc->recmask;
}
 
static int
sb_mixer_ioctl (int dev, unsigned int cmd, caddr_t arg)
{
  sb_devc        *devc = mixer_devs[dev]->devc;
 
  if (((cmd >> 8) & 0xff) == 'M')
    {
      if (_IOC_DIR (cmd) & _IOC_WRITE)
        switch (cmd & 0xff)
          {
          case SOUND_MIXER_RECSRC:
            return snd_ioctl_return ((int *) arg, set_recmask (devc, get_user ((int *) arg)));
            break;
 
          default:
 
            return snd_ioctl_return ((int *) arg, sb_mixer_set (devc, cmd & 0xff, get_user ((int *) arg)));
          }
      else
        switch (cmd & 0xff)
          {
 
          case SOUND_MIXER_RECSRC:
            return snd_ioctl_return ((int *) arg, devc->recmask);
            break;
 
          case SOUND_MIXER_DEVMASK:
            return snd_ioctl_return ((int *) arg, devc->supported_devices);
            break;
 
          case SOUND_MIXER_STEREODEVS:
            if (devc->model == MDL_JAZZ || devc->model == MDL_SMW)
              return snd_ioctl_return ((int *) arg, devc->supported_devices);
            else
              return snd_ioctl_return ((int *) arg, devc->supported_devices & ~(SOUND_MASK_MIC | SOUND_MASK_SPEAKER));
            break;
 
          case SOUND_MIXER_RECMASK:
            return snd_ioctl_return ((int *) arg, devc->supported_rec_devices);
            break;
 
          case SOUND_MIXER_CAPS:
            return snd_ioctl_return ((int *) arg, devc->mixer_caps);
            break;
 
          default:
            return snd_ioctl_return ((int *) arg, sb_mixer_get (devc, cmd & 0xff));
          }
    }
  else
    return -(EINVAL);
}
 
static struct mixer_operations sb_mixer_operations =
{
  "SB",
  "Sound Blaster",
  sb_mixer_ioctl
};
 
void
sb_mixer_reset (sb_devc * devc)
{
  int             i;
 
  for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
    sb_mixer_set (devc, i, devc->levels[i]);
  set_recmask (devc, SOUND_MASK_MIC);
}
 
int
sb_mixer_init (sb_devc * devc)
{
  int             mixer_type = 0;
 
  sb_setmixer (devc, 0x00, 0);   /* Reset mixer */
 
  if (!(mixer_type = detect_mixer (devc)))
    return 0;                    /* No mixer. Why? */
 
  switch (devc->model)
    {
    case MDL_SBPRO:
    case MDL_JAZZ:
      devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
      devc->supported_devices = SBPRO_MIXER_DEVICES;
      devc->supported_rec_devices = SBPRO_RECORDING_DEVICES;
      devc->iomap = &sbpro_mix;
      break;
 
    case MDL_ESS:
      devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
      devc->supported_devices = ES688_MIXER_DEVICES;
      devc->supported_rec_devices = ES688_RECORDING_DEVICES;
      devc->iomap = &es688_mix;
      break;
 
    case MDL_SMW:
      devc->mixer_caps = SOUND_CAP_EXCL_INPUT;
      devc->supported_devices = 0;
      devc->supported_rec_devices = 0;
      devc->iomap = &sbpro_mix;
      smw_mixer_init (devc);
      break;
 
    case MDL_SB16:
      devc->mixer_caps = 0;
      devc->supported_devices = SB16_MIXER_DEVICES;
      devc->supported_rec_devices = SB16_RECORDING_DEVICES;
      devc->iomap = &sb16_mix;
      break;
 
    default:
      printk ("SB Warning: Unsupported mixer type %d\n", devc->model);
      return 0;
    }
 
  if (num_mixers >= MAX_MIXER_DEV)
    return 0;
 
 
  mixer_devs[num_mixers] = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct mixer_operations)));
 
  if (sound_nblocks < 1024)
    sound_nblocks++;;
  if (mixer_devs[num_mixers] == NULL)
    {
      printk ("sb_mixer: Can't allocate memory\n");
      return 0;
    }
 
  memcpy ((char *) mixer_devs[num_mixers], (char *) &sb_mixer_operations,
          sizeof (struct mixer_operations));
 
  mixer_devs[num_mixers]->devc = devc;
  memcpy ((char *) devc->levels, (char *) &default_levels, sizeof (default_levels));
 
  sb_mixer_reset (devc);
  devc->my_mixerdev = num_mixers++;
  return 1;
}
 
#endif

Browse

Tools

Subversion Repositories or1k

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

Line No.	Rev	Author	Line
1	1626	jcastillo
2			`/*`
3			`* sound/sb_mixer.c`
4			`*`
5			`* The low level mixer driver for the Sound Blaster compatible cards.`
6			`*/`
7			`/*`
8			`* Copyright (C) by Hannu Savolainen 1993-1996`
9			`*`
10			`* USS/Lite for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)`
11			`* Version 2 (June 1991). See the "COPYING" file distributed with this software`
12			`* for more info.`
13			`*/`
14			`#include <linux/config.h>`
15
16
17			`#include "sound_config.h"`
18
19			`#if defined(CONFIG_SBDSP)`
20			`#define __SB_MIXER_C__`
21
22			`#include "sb.h"`
23			`#include "sb_mixer.h"`
24
25			`void sb_mixer_reset (sb_devc * devc);`
26
27			`void`
28			`sb_mixer_set_stereo (sb_devc * devc, int mode)`
29			`{`
30			`sb_setmixer (devc, OUT_FILTER, ((sb_getmixer (devc, OUT_FILTER) & ~STEREO_DAC)`
31			`\| (mode ? STEREO_DAC : MONO_DAC)));`
32			`}`
33
34			`static int`
35			`detect_mixer (sb_devc * devc)`
36			`{`
37			`/*`
38			`* Detect the mixer by changing parameters of two volume channels. If the`
39			`* values read back match with the values written, the mixer is there (is`
40			`* it?)`
41			`*/`
42			`sb_setmixer (devc, FM_VOL, 0xff);`
43			`sb_setmixer (devc, VOC_VOL, 0x33);`
44
45			`if (sb_getmixer (devc, FM_VOL) != 0xff)`
46			`return 0;`
47			`if (sb_getmixer (devc, VOC_VOL) != 0x33)`
48			`return 0;`
49
50			`return 1;`
51			`}`
52
53			`static void`
54			`change_bits (sb_devc * devc, unsigned char *regval, int dev, int chn, int newval)`
55			`{`
56			`unsigned char mask;`
57			`int shift;`
58
59			`mask = (1 << (*devc->iomap)[dev][chn].nbits) - 1;`
60			`newval = (int) ((newval * mask) + 50) / 100; /* Scale */`
61
62			`shift = (devc->iomap)[dev][chn].bitoffs - (devc->iomap)[dev][LEFT_CHN].nbits + 1;`
63
64			`regval &= ~(mask << shift); / Mask out previous value */`
65			`regval \|= (newval & mask) << shift; / Set the new value */`
66			`}`
67
68			`static int`
69			`sb_mixer_get (sb_devc * devc, int dev)`
70			`{`
71			`if (!((1 << dev) & devc->supported_devices))`
72			`return -(EINVAL);`
73
74			`return devc->levels[dev];`
75			`}`
76
77			`void`
78			`smw_mixer_init (sb_devc * devc)`
79			`{`
80			`int i;`
81
82			`sb_setmixer (devc, 0x00, 0x18); /* Mute unused (Telephone) line */`
83			`sb_setmixer (devc, 0x10, 0x38); /* Config register 2 */`
84
85			`devc->supported_devices = 0;`
86			`for (i = 0; i < sizeof (smw_mix_regs); i++)`
87			`if (smw_mix_regs[i] != 0)`
88			`devc->supported_devices \|= (1 << i);`
89
90			`devc->supported_rec_devices = devc->supported_devices &`
91			`~(SOUND_MASK_BASS \| SOUND_MASK_TREBLE \| SOUND_MASK_PCM \|`
92			`SOUND_MASK_VOLUME);`
93
94			`sb_mixer_reset (devc);`
95			`}`
96
97			`static int`
98			`smw_mixer_set (sb_devc * devc, int dev, int value)`
99			`{`
100			`int left = value & 0x000000ff;`
101			`int right = (value & 0x0000ff00) >> 8;`
102			`int reg, val;`
103
104			`if (left > 100)`
105			`left = 100;`
106			`if (right > 100)`
107			`right = 100;`
108
109			`if (dev > 31)`
110			`return -(EINVAL);`
111
112			`if (!(devc->supported_devices & (1 << dev))) /* Not supported */`
113			`return -(EINVAL);`
114
115			`switch (dev)`
116			`{`
117			`case SOUND_MIXER_VOLUME:`
118			`sb_setmixer (devc, 0x0b, 96 - (96 * left / 100)); /* 96=mute, 0=max */`
119			`sb_setmixer (devc, 0x0c, 96 - (96 * right / 100));`
120			`break;`
121
122			`case SOUND_MIXER_BASS:`
123			`case SOUND_MIXER_TREBLE:`
124			`devc->levels[dev] = left \| (right << 8);`
125
126			`/* Set left bass and treble values */`
127			`val = ((devc->levels[SOUND_MIXER_TREBLE] & 0xff) * 16 / (unsigned) 100) << 4;`
128			`val \|= ((devc->levels[SOUND_MIXER_BASS] & 0xff) * 16 / (unsigned) 100) & 0x0f;`
129			`sb_setmixer (devc, 0x0d, val);`
130
131			`/* Set right bass and treble values */`
132			`val = (((devc->levels[SOUND_MIXER_TREBLE] >> 8) & 0xff) * 16 / (unsigned) 100) << 4;`
133			`val \|= (((devc->levels[SOUND_MIXER_BASS] >> 8) & 0xff) * 16 / (unsigned) 100) & 0x0f;`
134			`sb_setmixer (devc, 0x0e, val);`
135			`break;`
136
137			`default:`
138			`reg = smw_mix_regs[dev];`
139			`if (reg == 0)`
140			`return -(EINVAL);`
141			`sb_setmixer (devc, reg, (24 - (24 * left / 100)) \| 0x20); /* 24=mute, 0=max */`
142			`sb_setmixer (devc, reg + 1, (24 - (24 * right / 100)) \| 0x40);`
143			`}`
144
145			`devc->levels[dev] = left \| (right << 8);`
146			`return left \| (right << 8);`
147			`}`
148
149			`static int`
150			`sb_mixer_set (sb_devc * devc, int dev, int value)`
151			`{`
152			`int left = value & 0x000000ff;`
153			`int right = (value & 0x0000ff00) >> 8;`
154
155			`int regoffs;`
156			`unsigned char val;`
157
158			`if (devc->model == MDL_SMW)`
159			`return smw_mixer_set (devc, dev, value);`
160
161			`if (left > 100)`
162			`left = 100;`
163			`if (right > 100)`
164			`right = 100;`
165
166			`if (dev > 31)`
167			`return -(EINVAL);`
168
169			`if (!(devc->supported_devices & (1 << dev))) /*`
170			`* Not supported`
171			`*/`
172			`return -(EINVAL);`
173
174			`regoffs = (*devc->iomap)[dev][LEFT_CHN].regno;`
175
176			`if (regoffs == 0)`
177			`return -(EINVAL);`
178
179			`val = sb_getmixer (devc, regoffs);`
180			`change_bits (devc, &val, dev, LEFT_CHN, left);`
181
182			`devc->levels[dev] = left \| (left << 8);`
183
184			`if ((devc->iomap)[dev][RIGHT_CHN].regno != regoffs) /`
185			`* Change register`
186			`*/`
187			`{`
188			`sb_setmixer (devc, regoffs, val); /*`
189			`* Save the old one`
190			`*/`
191			`regoffs = (*devc->iomap)[dev][RIGHT_CHN].regno;`
192
193			`if (regoffs == 0)`
194			`return left \| (left << 8); /*`
195			`* Just left channel present`
196			`*/`
197
198			`val = sb_getmixer (devc, regoffs); /*`
199			`* Read the new one`
200			`*/`
201			`}`
202
203			`change_bits (devc, &val, dev, RIGHT_CHN, right);`
204
205			`sb_setmixer (devc, regoffs, val);`
206
207			`devc->levels[dev] = left \| (right << 8);`
208			`return left \| (right << 8);`
209			`}`
210
211			`static void`
212			`set_recsrc (sb_devc * devc, int src)`
213			`{`
214			`sb_setmixer (devc, RECORD_SRC, (sb_getmixer (devc, RECORD_SRC) & ~7) \| (src & 0x7));`
215			`}`
216
217			`static int`
218			`set_recmask (sb_devc * devc, int mask)`
219			`{`
220			`int devmask, i;`
221			`unsigned char regimageL, regimageR;`
222
223			`devmask = mask & devc->supported_rec_devices;`
224
225			`switch (devc->model)`
226			`{`
227			`case MDL_SBPRO:`
228			`case MDL_ESS:`
229			`case MDL_JAZZ:`
230			`case MDL_SMW:`
231
232			`if (devmask != SOUND_MASK_MIC &&`
233			`devmask != SOUND_MASK_LINE &&`
234			`devmask != SOUND_MASK_CD)`
235			`{ /*`
236			`* More than one devices selected. Drop the *`
237			`* previous selection`
238			`*/`
239			`devmask &= ~devc->recmask;`
240			`}`
241
242			`if (devmask != SOUND_MASK_MIC &&`
243			`devmask != SOUND_MASK_LINE &&`
244			`devmask != SOUND_MASK_CD)`
245			`{ /*`
246			`* More than one devices selected. Default to`
247			`* * mic`
248			`*/`
249			`devmask = SOUND_MASK_MIC;`
250			`}`
251
252
253			`if (devmask ^ devc->recmask) /*`
254			`* Input source changed`
255			`*/`
256			`{`
257			`switch (devmask)`
258			`{`
259
260			`case SOUND_MASK_MIC:`
261			`set_recsrc (devc, SRC__MIC);`
262			`break;`
263
264			`case SOUND_MASK_LINE:`
265			`set_recsrc (devc, SRC__LINE);`
266			`break;`
267
268			`case SOUND_MASK_CD:`
269			`set_recsrc (devc, SRC__CD);`
270			`break;`
271
272			`default:`
273			`set_recsrc (devc, SRC__MIC);`
274			`}`
275			`}`
276
277			`break;`
278
279			`case MDL_SB16:`
280			`if (!devmask)`
281			`devmask = SOUND_MASK_MIC;`
282
283			`regimageL = regimageR = 0;`
284			`for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)`
285			`if ((1 << i) & devmask)`
286			`{`
287			`regimageL \|= sb16_recmasks_L[i];`
288			`regimageR \|= sb16_recmasks_R[i];`
289			`}`
290			`sb_setmixer (devc, SB16_IMASK_L, regimageL);`
291			`sb_setmixer (devc, SB16_IMASK_R, regimageR);`
292			`break;`
293			`}`
294
295			`devc->recmask = devmask;`
296			`return devc->recmask;`
297			`}`
298
299			`static int`
300			`sb_mixer_ioctl (int dev, unsigned int cmd, caddr_t arg)`
301			`{`
302			`sb_devc *devc = mixer_devs[dev]->devc;`
303
304			`if (((cmd >> 8) & 0xff) == 'M')`
305			`{`
306			`if (_IOC_DIR (cmd) & _IOC_WRITE)`
307			`switch (cmd & 0xff)`
308			`{`
309			`case SOUND_MIXER_RECSRC:`
310			`return snd_ioctl_return ((int ) arg, set_recmask (devc, get_user ((int ) arg)));`
311			`break;`
312
313			`default:`
314
315			`return snd_ioctl_return ((int ) arg, sb_mixer_set (devc, cmd & 0xff, get_user ((int ) arg)));`
316			`}`
317			`else`
318			`switch (cmd & 0xff)`
319			`{`
320
321			`case SOUND_MIXER_RECSRC:`
322			`return snd_ioctl_return ((int *) arg, devc->recmask);`
323			`break;`
324
325			`case SOUND_MIXER_DEVMASK:`
326			`return snd_ioctl_return ((int *) arg, devc->supported_devices);`
327			`break;`
328
329			`case SOUND_MIXER_STEREODEVS:`
330			`if (devc->model == MDL_JAZZ \|\| devc->model == MDL_SMW)`
331			`return snd_ioctl_return ((int *) arg, devc->supported_devices);`
332			`else`
333			`return snd_ioctl_return ((int *) arg, devc->supported_devices & ~(SOUND_MASK_MIC \| SOUND_MASK_SPEAKER));`
334			`break;`
335
336			`case SOUND_MIXER_RECMASK:`
337			`return snd_ioctl_return ((int *) arg, devc->supported_rec_devices);`
338			`break;`
339
340			`case SOUND_MIXER_CAPS:`
341			`return snd_ioctl_return ((int *) arg, devc->mixer_caps);`
342			`break;`
343
344			`default:`
345			`return snd_ioctl_return ((int *) arg, sb_mixer_get (devc, cmd & 0xff));`
346			`}`
347			`}`
348			`else`
349			`return -(EINVAL);`
350			`}`
351
352			`static struct mixer_operations sb_mixer_operations =`
353			`{`
354			`"SB",`
355			`"Sound Blaster",`
356			`sb_mixer_ioctl`
357			`};`
358
359			`void`
360			`sb_mixer_reset (sb_devc * devc)`
361			`{`
362			`int i;`
363
364			`for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)`
365			`sb_mixer_set (devc, i, devc->levels[i]);`
366			`set_recmask (devc, SOUND_MASK_MIC);`
367			`}`
368
369			`int`
370			`sb_mixer_init (sb_devc * devc)`
371			`{`
372			`int mixer_type = 0;`
373
374			`sb_setmixer (devc, 0x00, 0); /* Reset mixer */`
375
376			`if (!(mixer_type = detect_mixer (devc)))`
377			`return 0; /* No mixer. Why? */`
378
379			`switch (devc->model)`
380			`{`
381			`case MDL_SBPRO:`
382			`case MDL_JAZZ:`
383			`devc->mixer_caps = SOUND_CAP_EXCL_INPUT;`
384			`devc->supported_devices = SBPRO_MIXER_DEVICES;`
385			`devc->supported_rec_devices = SBPRO_RECORDING_DEVICES;`
386			`devc->iomap = &sbpro_mix;`
387			`break;`
388
389			`case MDL_ESS:`
390			`devc->mixer_caps = SOUND_CAP_EXCL_INPUT;`
391			`devc->supported_devices = ES688_MIXER_DEVICES;`
392			`devc->supported_rec_devices = ES688_RECORDING_DEVICES;`
393			`devc->iomap = &es688_mix;`
394			`break;`
395
396			`case MDL_SMW:`
397			`devc->mixer_caps = SOUND_CAP_EXCL_INPUT;`
398			`devc->supported_devices = 0;`
399			`devc->supported_rec_devices = 0;`
400			`devc->iomap = &sbpro_mix;`
401			`smw_mixer_init (devc);`
402			`break;`
403
404			`case MDL_SB16:`
405			`devc->mixer_caps = 0;`
406			`devc->supported_devices = SB16_MIXER_DEVICES;`
407			`devc->supported_rec_devices = SB16_RECORDING_DEVICES;`
408			`devc->iomap = &sb16_mix;`
409			`break;`
410
411			`default:`
412			`printk ("SB Warning: Unsupported mixer type %d\n", devc->model);`
413			`return 0;`
414			`}`
415
416			`if (num_mixers >= MAX_MIXER_DEV)`
417			`return 0;`
418
419
420			`mixer_devs[num_mixers] = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vmalloc (sizeof (struct mixer_operations)));`
421
422			`if (sound_nblocks < 1024)`
423			`sound_nblocks++;;`
424			`if (mixer_devs[num_mixers] == NULL)`
425			`{`
426			`printk ("sb_mixer: Can't allocate memory\n");`
427			`return 0;`
428			`}`
429
430			`memcpy ((char ) mixer_devs[num_mixers], (char ) &sb_mixer_operations,`
431			`sizeof (struct mixer_operations));`
432
433			`mixer_devs[num_mixers]->devc = devc;`
434			`memcpy ((char ) devc->levels, (char ) &default_levels, sizeof (default_levels));`
435
436			`sb_mixer_reset (devc);`
437			`devc->my_mixerdev = num_mixers++;`
438			`return 1;`
439			`}`
440
441			`#endif`