/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- ad1843_read_bits
- ad1843_write_bits
- ad1843_read_multi
- ad1843_write_multi
- ad1843_get_gain_max
- ad1843_get_gain
- ad1843_set_gain
- ad1843_get_recsrc
- ad1843_set_recsrc
- ad1843_setup_dac
- ad1843_shutdown_dac
- ad1843_setup_adc
- ad1843_shutdown_adc
- ad1843_init
/*
* AD1843 low level driver
*
* Copyright 2003 Vivien Chappelier <vivien.chappelier@linux-mips.org>
* Copyright 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
*
* inspired from vwsnd.c (SGI VW audio driver)
* Copyright 1999 Silicon Graphics, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ad1843.h>
/*
* AD1843 bitfield definitions. All are named as in the AD1843 data
* sheet, with ad1843_ prepended and individual bit numbers removed.
*
* E.g., bits LSS0 through LSS2 become ad1843_LSS.
*
* Only the bitfields we need are defined.
*/
struct ad1843_bitfield {
char reg;
char lo_bit;
char nbits;
};
static const struct ad1843_bitfield
ad1843_PDNO = { 0, 14, 1 }, /* Converter Power-Down Flag */
ad1843_INIT = { 0, 15, 1 }, /* Clock Initialization Flag */
ad1843_RIG = { 2, 0, 4 }, /* Right ADC Input Gain */
ad1843_RMGE = { 2, 4, 1 }, /* Right ADC Mic Gain Enable */
ad1843_RSS = { 2, 5, 3 }, /* Right ADC Source Select */
ad1843_LIG = { 2, 8, 4 }, /* Left ADC Input Gain */
ad1843_LMGE = { 2, 12, 1 }, /* Left ADC Mic Gain Enable */
ad1843_LSS = { 2, 13, 3 }, /* Left ADC Source Select */
ad1843_RD2M = { 3, 0, 5 }, /* Right DAC 2 Mix Gain/Atten */
ad1843_RD2MM = { 3, 7, 1 }, /* Right DAC 2 Mix Mute */
ad1843_LD2M = { 3, 8, 5 }, /* Left DAC 2 Mix Gain/Atten */
ad1843_LD2MM = { 3, 15, 1 }, /* Left DAC 2 Mix Mute */
ad1843_RX1M = { 4, 0, 5 }, /* Right Aux 1 Mix Gain/Atten */
ad1843_RX1MM = { 4, 7, 1 }, /* Right Aux 1 Mix Mute */
ad1843_LX1M = { 4, 8, 5 }, /* Left Aux 1 Mix Gain/Atten */
ad1843_LX1MM = { 4, 15, 1 }, /* Left Aux 1 Mix Mute */
ad1843_RX2M = { 5, 0, 5 }, /* Right Aux 2 Mix Gain/Atten */
ad1843_RX2MM = { 5, 7, 1 }, /* Right Aux 2 Mix Mute */
ad1843_LX2M = { 5, 8, 5 }, /* Left Aux 2 Mix Gain/Atten */
ad1843_LX2MM = { 5, 15, 1 }, /* Left Aux 2 Mix Mute */
ad1843_RMCM = { 7, 0, 5 }, /* Right Mic Mix Gain/Atten */
ad1843_RMCMM = { 7, 7, 1 }, /* Right Mic Mix Mute */
ad1843_LMCM = { 7, 8, 5 }, /* Left Mic Mix Gain/Atten */
ad1843_LMCMM = { 7, 15, 1 }, /* Left Mic Mix Mute */
ad1843_HPOS = { 8, 4, 1 }, /* Headphone Output Voltage Swing */
ad1843_HPOM = { 8, 5, 1 }, /* Headphone Output Mute */
ad1843_MPOM = { 8, 6, 1 }, /* Mono Output Mute */
ad1843_RDA1G = { 9, 0, 6 }, /* Right DAC1 Analog/Digital Gain */
ad1843_RDA1GM = { 9, 7, 1 }, /* Right DAC1 Analog Mute */
ad1843_LDA1G = { 9, 8, 6 }, /* Left DAC1 Analog/Digital Gain */
ad1843_LDA1GM = { 9, 15, 1 }, /* Left DAC1 Analog Mute */
ad1843_RDA2G = { 10, 0, 6 }, /* Right DAC2 Analog/Digital Gain */
ad1843_RDA2GM = { 10, 7, 1 }, /* Right DAC2 Analog Mute */
ad1843_LDA2G = { 10, 8, 6 }, /* Left DAC2 Analog/Digital Gain */
ad1843_LDA2GM = { 10, 15, 1 }, /* Left DAC2 Analog Mute */
ad1843_RDA1AM = { 11, 7, 1 }, /* Right DAC1 Digital Mute */
ad1843_LDA1AM = { 11, 15, 1 }, /* Left DAC1 Digital Mute */
ad1843_RDA2AM = { 12, 7, 1 }, /* Right DAC2 Digital Mute */
ad1843_LDA2AM = { 12, 15, 1 }, /* Left DAC2 Digital Mute */
ad1843_ADLC = { 15, 0, 2 }, /* ADC Left Sample Rate Source */
ad1843_ADRC = { 15, 2, 2 }, /* ADC Right Sample Rate Source */
ad1843_DA1C = { 15, 8, 2 }, /* DAC1 Sample Rate Source */
ad1843_DA2C = { 15, 10, 2 }, /* DAC2 Sample Rate Source */
ad1843_C1C = { 17, 0, 16 }, /* Clock 1 Sample Rate Select */
ad1843_C2C = { 20, 0, 16 }, /* Clock 2 Sample Rate Select */
ad1843_C3C = { 23, 0, 16 }, /* Clock 3 Sample Rate Select */
ad1843_DAADL = { 25, 4, 2 }, /* Digital ADC Left Source Select */
ad1843_DAADR = { 25, 6, 2 }, /* Digital ADC Right Source Select */
ad1843_DAMIX = { 25, 14, 1 }, /* DAC Digital Mix Enable */
ad1843_DRSFLT = { 25, 15, 1 }, /* Digital Reampler Filter Mode */
ad1843_ADLF = { 26, 0, 2 }, /* ADC Left Channel Data Format */
ad1843_ADRF = { 26, 2, 2 }, /* ADC Right Channel Data Format */
ad1843_ADTLK = { 26, 4, 1 }, /* ADC Transmit Lock Mode Select */
ad1843_SCF = { 26, 7, 1 }, /* SCLK Frequency Select */
ad1843_DA1F = { 26, 8, 2 }, /* DAC1 Data Format Select */
ad1843_DA2F = { 26, 10, 2 }, /* DAC2 Data Format Select */
ad1843_DA1SM = { 26, 14, 1 }, /* DAC1 Stereo/Mono Mode Select */
ad1843_DA2SM = { 26, 15, 1 }, /* DAC2 Stereo/Mono Mode Select */
ad1843_ADLEN = { 27, 0, 1 }, /* ADC Left Channel Enable */
ad1843_ADREN = { 27, 1, 1 }, /* ADC Right Channel Enable */
ad1843_AAMEN = { 27, 4, 1 }, /* Analog to Analog Mix Enable */
ad1843_ANAEN = { 27, 7, 1 }, /* Analog Channel Enable */
ad1843_DA1EN = { 27, 8, 1 }, /* DAC1 Enable */
ad1843_DA2EN = { 27, 9, 1 }, /* DAC2 Enable */
ad1843_DDMEN = { 27, 12, 1 }, /* DAC2 to DAC1 Mix Enable */
ad1843_C1EN = { 28, 11, 1 }, /* Clock Generator 1 Enable */
ad1843_C2EN = { 28, 12, 1 }, /* Clock Generator 2 Enable */
ad1843_C3EN = { 28, 13, 1 }, /* Clock Generator 3 Enable */
ad1843_PDNI = { 28, 15, 1 }; /* Converter Power Down */
/*
* The various registers of the AD1843 use three different formats for
* specifying gain. The ad1843_gain structure parameterizes the
* formats.
*/
struct ad1843_gain {
int negative; /* nonzero if gain is negative. */
const struct ad1843_bitfield *lfield;
const struct ad1843_bitfield *rfield;
const struct ad1843_bitfield *lmute;
const struct ad1843_bitfield *rmute;
};
static const struct ad1843_gain ad1843_gain_RECLEV = {
.negative = 0,
.lfield = &ad1843_LIG,
.rfield = &ad1843_RIG
};
static const struct ad1843_gain ad1843_gain_LINE = {
.negative = 1,
.lfield = &ad1843_LX1M,
.rfield = &ad1843_RX1M,
.lmute = &ad1843_LX1MM,
.rmute = &ad1843_RX1MM
};
static const struct ad1843_gain ad1843_gain_LINE_2 = {
.negative = 1,
.lfield = &ad1843_LDA2G,
.rfield = &ad1843_RDA2G,
.lmute = &ad1843_LDA2GM,
.rmute = &ad1843_RDA2GM
};
static const struct ad1843_gain ad1843_gain_MIC = {
.negative = 1,
.lfield = &ad1843_LMCM,
.rfield = &ad1843_RMCM,
.lmute = &ad1843_LMCMM,
.rmute = &ad1843_RMCMM
};
static const struct ad1843_gain ad1843_gain_PCM_0 = {
.negative = 1,
.lfield = &ad1843_LDA1G,
.rfield = &ad1843_RDA1G,
.lmute = &ad1843_LDA1GM,
.rmute = &ad1843_RDA1GM
};
static const struct ad1843_gain ad1843_gain_PCM_1 = {
.negative = 1,
.lfield = &ad1843_LD2M,
.rfield = &ad1843_RD2M,
.lmute = &ad1843_LD2MM,
.rmute = &ad1843_RD2MM
};
static const struct ad1843_gain *ad1843_gain[AD1843_GAIN_SIZE] =
{
&ad1843_gain_RECLEV,
&ad1843_gain_LINE,
&ad1843_gain_LINE_2,
&ad1843_gain_MIC,
&ad1843_gain_PCM_0,
&ad1843_gain_PCM_1,
};
/* read the current value of an AD1843 bitfield. */
static int ad1843_read_bits(struct snd_ad1843 *ad1843,
const struct ad1843_bitfield *field)
{
int w;
w = ad1843->read(ad1843->chip, field->reg);
return w >> field->lo_bit & ((1 << field->nbits) - 1);
}
/*
* write a new value to an AD1843 bitfield and return the old value.
*/
static int ad1843_write_bits(struct snd_ad1843 *ad1843,
const struct ad1843_bitfield *field,
int newval)
{
int w, mask, oldval, newbits;
w = ad1843->read(ad1843->chip, field->reg);
mask = ((1 << field->nbits) - 1) << field->lo_bit;
oldval = (w & mask) >> field->lo_bit;
newbits = (newval << field->lo_bit) & mask;
w = (w & ~mask) | newbits;
ad1843->write(ad1843->chip, field->reg, w);
return oldval;
}
/*
* ad1843_read_multi reads multiple bitfields from the same AD1843
* register. It uses a single read cycle to do it. (Reading the
* ad1843 requires 256 bit times at 12.288 MHz, or nearly 20
* microseconds.)
*
* Called like this.
*
* ad1843_read_multi(ad1843, nfields,
* &ad1843_FIELD1, &val1,
* &ad1843_FIELD2, &val2, ...);
*/
static void ad1843_read_multi(struct snd_ad1843 *ad1843, int argcount, ...)
{
va_list ap;
const struct ad1843_bitfield *fp;
int w = 0, mask, *value, reg = -1;
va_start(ap, argcount);
while (--argcount >= 0) {
fp = va_arg(ap, const struct ad1843_bitfield *);
value = va_arg(ap, int *);
if (reg == -1) {
reg = fp->reg;
w = ad1843->read(ad1843->chip, reg);
}
mask = (1 << fp->nbits) - 1;
*value = w >> fp->lo_bit & mask;
}
va_end(ap);
}
/*
* ad1843_write_multi stores multiple bitfields into the same AD1843
* register. It uses one read and one write cycle to do it.
*
* Called like this.
*
* ad1843_write_multi(ad1843, nfields,
* &ad1843_FIELD1, val1,
* &ad1843_FIELF2, val2, ...);
*/
static void ad1843_write_multi(struct snd_ad1843 *ad1843, int argcount, ...)
{
va_list ap;
int reg;
const struct ad1843_bitfield *fp;
int value;
int w, m, mask, bits;
mask = 0;
bits = 0;
reg = -1;
va_start(ap, argcount);
while (--argcount >= 0) {
fp = va_arg(ap, const struct ad1843_bitfield *);
value = va_arg(ap, int);
if (reg == -1)
reg = fp->reg;
else
BUG_ON(reg != fp->reg);
m = ((1 << fp->nbits) - 1) << fp->lo_bit;
mask |= m;
bits |= (value << fp->lo_bit) & m;
}
va_end(ap);
if (~mask & 0xFFFF)
w = ad1843->read(ad1843->chip, reg);
else
w = 0;
w = (w & ~mask) | bits;
ad1843->write(ad1843->chip, reg, w);
}
int ad1843_get_gain_max(struct snd_ad1843 *ad1843, int id)
{
const struct ad1843_gain *gp = ad1843_gain[id];
int ret;
ret = (1 << gp->lfield->nbits);
if (!gp->lmute)
ret -= 1;
return ret;
}
/*
* ad1843_get_gain reads the specified register and extracts the gain value
* using the supplied gain type.
*/
int ad1843_get_gain(struct snd_ad1843 *ad1843, int id)
{
int lg, rg, lm, rm;
const struct ad1843_gain *gp = ad1843_gain[id];
unsigned short mask = (1 << gp->lfield->nbits) - 1;
ad1843_read_multi(ad1843, 2, gp->lfield, &lg, gp->rfield, &rg);
if (gp->negative) {
lg = mask - lg;
rg = mask - rg;
}
if (gp->lmute) {
ad1843_read_multi(ad1843, 2, gp->lmute, &lm, gp->rmute, &rm);
if (lm)
lg = 0;
if (rm)
rg = 0;
}
return lg << 0 | rg << 8;
}
/*
* Set an audio channel's gain.
*
* Returns the new gain, which may be lower than the old gain.
*/
int ad1843_set_gain(struct snd_ad1843 *ad1843, int id, int newval)
{
const struct ad1843_gain *gp = ad1843_gain[id];
unsigned short mask = (1 << gp->lfield->nbits) - 1;
int lg = (newval >> 0) & mask;
int rg = (newval >> 8) & mask;
int lm = (lg == 0) ? 1 : 0;
int rm = (rg == 0) ? 1 : 0;
if (gp->negative) {
lg = mask - lg;
rg = mask - rg;
}
if (gp->lmute)
ad1843_write_multi(ad1843, 2, gp->lmute, lm, gp->rmute, rm);
ad1843_write_multi(ad1843, 2, gp->lfield, lg, gp->rfield, rg);
return ad1843_get_gain(ad1843, id);
}
/* Returns the current recording source */
int ad1843_get_recsrc(struct snd_ad1843 *ad1843)
{
int val = ad1843_read_bits(ad1843, &ad1843_LSS);
if (val < 0 || val > 2) {
val = 2;
ad1843_write_multi(ad1843, 2,
&ad1843_LSS, val, &ad1843_RSS, val);
}
return val;
}
/*
* Set recording source.
*
* Returns newsrc on success, -errno on failure.
*/
int ad1843_set_recsrc(struct snd_ad1843 *ad1843, int newsrc)
{
if (newsrc < 0 || newsrc > 2)
return -EINVAL;
ad1843_write_multi(ad1843, 2, &ad1843_LSS, newsrc, &ad1843_RSS, newsrc);
return newsrc;
}
/* Setup ad1843 for D/A conversion. */
void ad1843_setup_dac(struct snd_ad1843 *ad1843,
unsigned int id,
unsigned int framerate,
snd_pcm_format_t fmt,
unsigned int channels)
{
int ad_fmt = 0, ad_mode = 0;
switch (fmt) {
case SNDRV_PCM_FORMAT_S8:
ad_fmt = 0;
break;
case SNDRV_PCM_FORMAT_U8:
ad_fmt = 0;
break;
case SNDRV_PCM_FORMAT_S16_LE:
ad_fmt = 1;
break;
case SNDRV_PCM_FORMAT_MU_LAW:
ad_fmt = 2;
break;
case SNDRV_PCM_FORMAT_A_LAW:
ad_fmt = 3;
break;
default:
break;
}
switch (channels) {
case 2:
ad_mode = 0;
break;
case 1:
ad_mode = 1;
break;
default:
break;
}
if (id) {
ad1843_write_bits(ad1843, &ad1843_C2C, framerate);
ad1843_write_multi(ad1843, 2,
&ad1843_DA2SM, ad_mode,
&ad1843_DA2F, ad_fmt);
} else {
ad1843_write_bits(ad1843, &ad1843_C1C, framerate);
ad1843_write_multi(ad1843, 2,
&ad1843_DA1SM, ad_mode,
&ad1843_DA1F, ad_fmt);
}
}
void ad1843_shutdown_dac(struct snd_ad1843 *ad1843, unsigned int id)
{
if (id)
ad1843_write_bits(ad1843, &ad1843_DA2F, 1);
else
ad1843_write_bits(ad1843, &ad1843_DA1F, 1);
}
void ad1843_setup_adc(struct snd_ad1843 *ad1843,
unsigned int framerate,
snd_pcm_format_t fmt,
unsigned int channels)
{
int da_fmt = 0;
switch (fmt) {
case SNDRV_PCM_FORMAT_S8: da_fmt = 0; break;
case SNDRV_PCM_FORMAT_U8: da_fmt = 0; break;
case SNDRV_PCM_FORMAT_S16_LE: da_fmt = 1; break;
case SNDRV_PCM_FORMAT_MU_LAW: da_fmt = 2; break;
case SNDRV_PCM_FORMAT_A_LAW: da_fmt = 3; break;
default: break;
}
ad1843_write_bits(ad1843, &ad1843_C3C, framerate);
ad1843_write_multi(ad1843, 2,
&ad1843_ADLF, da_fmt, &ad1843_ADRF, da_fmt);
}
void ad1843_shutdown_adc(struct snd_ad1843 *ad1843)
{
/* nothing to do */
}
/*
* Fully initialize the ad1843. As described in the AD1843 data
* sheet, section "START-UP SEQUENCE". The numbered comments are
* subsection headings from the data sheet. See the data sheet, pages
* 52-54, for more info.
*
* return 0 on success, -errno on failure. */
int ad1843_init(struct snd_ad1843 *ad1843)
{
unsigned long later;
if (ad1843_read_bits(ad1843, &ad1843_INIT) != 0) {
printk(KERN_ERR "ad1843: AD1843 won't initialize\n");
return -EIO;
}
ad1843_write_bits(ad1843, &ad1843_SCF, 1);
/* 4. Put the conversion resources into standby. */
ad1843_write_bits(ad1843, &ad1843_PDNI, 0);
later = jiffies + msecs_to_jiffies(500);
while (ad1843_read_bits(ad1843, &ad1843_PDNO)) {
if (time_after(jiffies, later)) {
printk(KERN_ERR
"ad1843: AD1843 won't power up\n");
return -EIO;
}
schedule_timeout_interruptible(5);
}
/* 5. Power up the clock generators and enable clock output pins. */
ad1843_write_multi(ad1843, 3,
&ad1843_C1EN, 1,
&ad1843_C2EN, 1,
&ad1843_C3EN, 1);
/* 6. Configure conversion resources while they are in standby. */
/* DAC1/2 use clock 1/2 as source, ADC uses clock 3. Always. */
ad1843_write_multi(ad1843, 4,
&ad1843_DA1C, 1,
&ad1843_DA2C, 2,
&ad1843_ADLC, 3,
&ad1843_ADRC, 3);
/* 7. Enable conversion resources. */
ad1843_write_bits(ad1843, &ad1843_ADTLK, 1);
ad1843_write_multi(ad1843, 7,
&ad1843_ANAEN, 1,
&ad1843_AAMEN, 1,
&ad1843_DA1EN, 1,
&ad1843_DA2EN, 1,
&ad1843_DDMEN, 1,
&ad1843_ADLEN, 1,
&ad1843_ADREN, 1);
/* 8. Configure conversion resources while they are enabled. */
/* set gain to 0 for all channels */
ad1843_set_gain(ad1843, AD1843_GAIN_RECLEV, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_LINE, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_LINE_2, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_MIC, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_PCM_0, 0);
ad1843_set_gain(ad1843, AD1843_GAIN_PCM_1, 0);
/* Unmute all channels. */
/* DAC1 */
ad1843_write_multi(ad1843, 2, &ad1843_LDA1GM, 0, &ad1843_RDA1GM, 0);
/* DAC2 */
ad1843_write_multi(ad1843, 2, &ad1843_LDA2GM, 0, &ad1843_RDA2GM, 0);
/* Set default recording source to Line In and set
* mic gain to +20 dB.
*/
ad1843_set_recsrc(ad1843, 2);
ad1843_write_multi(ad1843, 2, &ad1843_LMGE, 1, &ad1843_RMGE, 1);
/* Set Speaker Out level to +/- 4V and unmute it. */
ad1843_write_multi(ad1843, 3,
&ad1843_HPOS, 1,
&ad1843_HPOM, 0,
&ad1843_MPOM, 0);
return 0;
}