cregit-Linux how code gets into the kernel

Release 4.7 sound/oss/pas2_mixer.c

Directory: sound/oss
/*
 * sound/oss/pas2_mixer.c
 *
 * Mixer routines for the Pro Audio Spectrum cards.
 */

/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free 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.
 */
/*
 * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
 * Bartlomiej Zolnierkiewicz : added __init to pas_init_mixer()
 */
#include <linux/init.h>
#include "sound_config.h"

#include "pas2.h"

extern int      pas_translate_code;
extern char     pas_model;
extern int     *pas_osp;
extern int      pas_audiodev;


static int      rec_devices = (SOUND_MASK_MIC);		
/* Default recording source */

static int      mode_control;


#define POSSIBLE_RECORDING_DEVICES	(SOUND_MASK_SYNTH | SOUND_MASK_SPEAKER | SOUND_MASK_LINE | SOUND_MASK_MIC | \
                                         SOUND_MASK_CD | SOUND_MASK_ALTPCM)


#define SUPPORTED_MIXER_DEVICES		(SOUND_MASK_SYNTH | SOUND_MASK_PCM | SOUND_MASK_SPEAKER | SOUND_MASK_LINE | SOUND_MASK_MIC | \
                                         SOUND_MASK_CD | SOUND_MASK_ALTPCM | SOUND_MASK_IMIX | \
                                         SOUND_MASK_VOLUME | SOUND_MASK_BASS | SOUND_MASK_TREBLE | SOUND_MASK_RECLEV)


static int     *levels;


static int      default_levels[32] =
{
	0x3232,			/* Master Volume */
	0x3232,			/* Bass */
	0x3232,			/* Treble */
	0x5050,			/* FM */
	0x4b4b,			/* PCM */
	0x3232,			/* PC Speaker */
	0x4b4b,			/* Ext Line */
	0x4b4b,			/* Mic */
	0x4b4b,			/* CD */
	0x6464,			/* Recording monitor */
	0x4b4b,			/* SB PCM */
	0x6464			/* Recording level */
};


void mix_write(unsigned char data, int ioaddr) { /* * The Revision D cards have a problem with their MVA508 interface. The * kludge-o-rama fix is to make a 16-bit quantity with identical LSB and * MSBs out of the output byte and to do a 16-bit out to the mixer port - * 1. We need to do this because it isn't timing problem but chip access * sequence problem. */ if (pas_model == 4) { outw(data | (data << 8), (ioaddr + pas_translate_code) - 1); outb((0x80), 0); } else pas_write(data, ioaddr); }

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static int mixer_output(int right_vol, int left_vol, int div, int bits, int mixer) /* Input or output mixer */ { int left = left_vol * div / 100; int right = right_vol * div / 100; if (bits & 0x10) { left |= mixer; right |= mixer; } if (bits == 0x03 || bits == 0x04) { mix_write(0x80 | bits, 0x078B); mix_write(left, 0x078B); right_vol = left_vol; } else { mix_write(0x80 | 0x20 | bits, 0x078B); mix_write(left, 0x078B); mix_write(0x80 | 0x40 | bits, 0x078B); mix_write(right, 0x078B); } return (left_vol | (right_vol << 8)); }

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static void set_mode(int new_mode) { mix_write(0x80 | 0x05, 0x078B); mix_write(new_mode, 0x078B); mode_control = new_mode; }

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static int pas_mixer_set(int whichDev, unsigned int level) { int left, right, devmask, changed, i, mixer = 0; left = level & 0x7f; right = (level & 0x7f00) >> 8; if (whichDev < SOUND_MIXER_NRDEVICES) { if ((1 << whichDev) & rec_devices) mixer = 0x20; else mixer = 0x00; } switch (whichDev) { case SOUND_MIXER_VOLUME: /* Master volume (0-63) */ levels[whichDev] = mixer_output(right, left, 63, 0x01, 0); break; /* * Note! Bass and Treble are mono devices. Will use just the left * channel. */ case SOUND_MIXER_BASS: /* Bass (0-12) */ levels[whichDev] = mixer_output(right, left, 12, 0x03, 0); break; case SOUND_MIXER_TREBLE: /* Treble (0-12) */ levels[whichDev] = mixer_output(right, left, 12, 0x04, 0); break; case SOUND_MIXER_SYNTH: /* Internal synthesizer (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x00, mixer); break; case SOUND_MIXER_PCM: /* PAS PCM (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x05, mixer); break; case SOUND_MIXER_ALTPCM: /* SB PCM (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x07, mixer); break; case SOUND_MIXER_SPEAKER: /* PC speaker (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x06, mixer); break; case SOUND_MIXER_LINE: /* External line (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x02, mixer); break; case SOUND_MIXER_CD: /* CD (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x03, mixer); break; case SOUND_MIXER_MIC: /* External microphone (0-31) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x04, mixer); break; case SOUND_MIXER_IMIX: /* Recording monitor (0-31) (Output mixer only) */ levels[whichDev] = mixer_output(right, left, 31, 0x10 | 0x01, 0x00); break; case SOUND_MIXER_RECLEV: /* Recording level (0-15) */ levels[whichDev] = mixer_output(right, left, 15, 0x02, 0); break; case SOUND_MIXER_RECSRC: devmask = level & POSSIBLE_RECORDING_DEVICES; changed = devmask ^ rec_devices; rec_devices = devmask; for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) if (changed & (1 << i)) { pas_mixer_set(i, levels[i]); } return rec_devices; break; default: return -EINVAL; } return (levels[whichDev]); }

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/*****/
static void pas_mixer_reset(void) { int foo; for (foo = 0; foo < SOUND_MIXER_NRDEVICES; foo++) pas_mixer_set(foo, levels[foo]); set_mode(0x04 | 0x01); }

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static int pas_mixer_ioctl(int dev, unsigned int cmd, void __user *arg) { int level,v ; int __user *p = (int __user *)arg; if (cmd == SOUND_MIXER_PRIVATE1) { /* Set loudness bit */ if (get_user(level, p)) return -EFAULT; if (level == -1) /* Return current settings */ level = (mode_control & 0x04); else { mode_control &= ~0x04; if (level) mode_control |= 0x04; set_mode(mode_control); } level = !!level; return put_user(level, p); } if (cmd == SOUND_MIXER_PRIVATE2) { /* Set enhance bit */ if (get_user(level, p)) return -EFAULT; if (level == -1) { /* Return current settings */ if (!(mode_control & 0x03)) level = 0; else level = ((mode_control & 0x03) + 1) * 20; } else { int i = 0; level &= 0x7f; if (level) i = (level / 20) - 1; mode_control &= ~0x03; mode_control |= i & 0x03; set_mode(mode_control); if (i) i = (i + 1) * 20; level = i; } return put_user(level, p); } if (cmd == SOUND_MIXER_PRIVATE3) { /* Set mute bit */ if (get_user(level, p)) return -EFAULT; if (level == -1) /* Return current settings */ level = !(pas_read(0x0B8A) & 0x20); else { if (level) pas_write(pas_read(0x0B8A) & (~0x20), 0x0B8A); else pas_write(pas_read(0x0B8A) | 0x20, 0x0B8A); level = !(pas_read(0x0B8A) & 0x20); } return put_user(level, p); } if (((cmd >> 8) & 0xff) == 'M') { if (get_user(v, p)) return -EFAULT; if (_SIOC_DIR(cmd) & _SIOC_WRITE) { v = pas_mixer_set(cmd & 0xff, v); } else { switch (cmd & 0xff) { case SOUND_MIXER_RECSRC: v = rec_devices; break; case SOUND_MIXER_STEREODEVS: v = SUPPORTED_MIXER_DEVICES & ~(SOUND_MASK_BASS | SOUND_MASK_TREBLE); break; case SOUND_MIXER_DEVMASK: v = SUPPORTED_MIXER_DEVICES; break; case SOUND_MIXER_RECMASK: v = POSSIBLE_RECORDING_DEVICES & SUPPORTED_MIXER_DEVICES; break; case SOUND_MIXER_CAPS: v = 0; /* No special capabilities */ break; default: v = levels[cmd & 0xff]; break; } } return put_user(v, p); } return -EINVAL; }

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static struct mixer_operations pas_mixer_operations = { .owner = THIS_MODULE, .id = "PAS16", .name = "Pro Audio Spectrum 16", .ioctl = pas_mixer_ioctl };
int __init pas_init_mixer(void) { int d; levels = load_mixer_volumes("PAS16_1", default_levels, 1); pas_mixer_reset(); if ((d = sound_alloc_mixerdev()) != -1) { audio_devs[pas_audiodev]->mixer_dev = d; mixer_devs[d] = &pas_mixer_operations; } return 1; }

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Directory: sound/oss
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