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at73c213.c
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at73c213.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for AT73C213 16-bit stereo DAC connected to Atmel SSC
*
* Copyright (C) 2006-2007 Atmel Norway
*/
/*#define DEBUG*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <sound/initval.h>
#include <sound/control.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <linux/atmel-ssc.h>
#include <linux/spi/spi.h>
#include <linux/spi/at73c213.h>
#include "at73c213.h"
#define BITRATE_MIN 8000 /* Hardware limit? */
#define BITRATE_TARGET CONFIG_SND_AT73C213_TARGET_BITRATE
#define BITRATE_MAX 50000 /* Hardware limit. */
/* Initial (hardware reset) AT73C213 register values. */
static const u8 snd_at73c213_original_image[18] =
{
0x00, /* 00 - CTRL */
0x05, /* 01 - LLIG */
0x05, /* 02 - RLIG */
0x08, /* 03 - LPMG */
0x08, /* 04 - RPMG */
0x00, /* 05 - LLOG */
0x00, /* 06 - RLOG */
0x22, /* 07 - OLC */
0x09, /* 08 - MC */
0x00, /* 09 - CSFC */
0x00, /* 0A - MISC */
0x00, /* 0B - */
0x00, /* 0C - PRECH */
0x05, /* 0D - AUXG */
0x00, /* 0E - */
0x00, /* 0F - */
0x00, /* 10 - RST */
0x00, /* 11 - PA_CTRL */
};
struct snd_at73c213 {
struct snd_card *card;
struct snd_pcm *pcm;
struct snd_pcm_substream *substream;
struct at73c213_board_info *board;
int irq;
int period;
unsigned long bitrate;
struct ssc_device *ssc;
struct spi_device *spi;
u8 spi_wbuffer[2];
u8 spi_rbuffer[2];
/* Image of the SPI registers in AT73C213. */
u8 reg_image[18];
/* Protect SSC registers against concurrent access. */
spinlock_t lock;
/* Protect mixer registers against concurrent access. */
struct mutex mixer_lock;
};
#define get_chip(card) ((struct snd_at73c213 *)card->private_data)
static int
snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
{
struct spi_message msg;
struct spi_transfer msg_xfer = {
.len = 2,
.cs_change = 0,
};
int retval;
spi_message_init(&msg);
chip->spi_wbuffer[0] = reg;
chip->spi_wbuffer[1] = val;
msg_xfer.tx_buf = chip->spi_wbuffer;
msg_xfer.rx_buf = chip->spi_rbuffer;
spi_message_add_tail(&msg_xfer, &msg);
retval = spi_sync(chip->spi, &msg);
if (!retval)
chip->reg_image[reg] = val;
return retval;
}
static struct snd_pcm_hardware snd_at73c213_playback_hw = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER,
.formats = SNDRV_PCM_FMTBIT_S16_BE,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.rate_min = 8000, /* Replaced by chip->bitrate later. */
.rate_max = 50000, /* Replaced by chip->bitrate later. */
.channels_min = 1,
.channels_max = 2,
.buffer_bytes_max = 64 * 1024 - 1,
.period_bytes_min = 512,
.period_bytes_max = 64 * 1024 - 1,
.periods_min = 4,
.periods_max = 1024,
};
/*
* Calculate and set bitrate and divisions.
*/
static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
{
unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
unsigned long dac_rate_new, ssc_div;
int status;
unsigned long ssc_div_max, ssc_div_min;
int max_tries;
/*
* We connect two clocks here, picking divisors so the I2S clocks
* out data at the same rate the DAC clocks it in ... and as close
* as practical to the desired target rate.
*
* The DAC master clock (MCLK) is programmable, and is either 256
* or (not here) 384 times the I2S output clock (BCLK).
*/
/* SSC clock / (bitrate * stereo * 16-bit). */
ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
max_tries = (ssc_div_max - ssc_div_min) / 2;
if (max_tries < 1)
max_tries = 1;
/* ssc_div must be even. */
ssc_div = (ssc_div + 1) & ~1UL;
if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
ssc_div -= 2;
if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
return -ENXIO;
}
/* Search for a possible bitrate. */
do {
/* SSC clock / (ssc divider * 16-bit * stereo). */
if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
return -ENXIO;
/* 256 / (2 * 16) = 8 */
dac_rate_new = 8 * (ssc_rate / ssc_div);
status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
if (status <= 0)
return status;
/* Ignore difference smaller than 256 Hz. */
if ((status/256) == (dac_rate_new/256))
goto set_rate;
ssc_div += 2;
} while (--max_tries);
/* Not able to find a valid bitrate. */
return -ENXIO;
set_rate:
status = clk_set_rate(chip->board->dac_clk, status);
if (status < 0)
return status;
/* Set divider in SSC device. */
ssc_writel(chip->ssc->regs, CMR, ssc_div/2);
/* SSC clock / (ssc divider * 16-bit * stereo). */
chip->bitrate = ssc_rate / (ssc_div * 16 * 2);
dev_info(&chip->spi->dev,
"at73c213: supported bitrate is %lu (%lu divider)\n",
chip->bitrate, ssc_div);
return 0;
}
static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
/* ensure buffer_size is a multiple of period_size */
err = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
snd_at73c213_playback_hw.rate_min = chip->bitrate;
snd_at73c213_playback_hw.rate_max = chip->bitrate;
runtime->hw = snd_at73c213_playback_hw;
chip->substream = substream;
clk_enable(chip->ssc->clk);
return 0;
}
static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
chip->substream = NULL;
clk_disable(chip->ssc->clk);
return 0;
}
static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
int channels = params_channels(hw_params);
int val;
val = ssc_readl(chip->ssc->regs, TFMR);
val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
ssc_writel(chip->ssc->regs, TFMR, val);
return 0;
}
static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int block_size;
block_size = frames_to_bytes(runtime, runtime->period_size);
chip->period = 0;
ssc_writel(chip->ssc->regs, PDC_TPR,
(long)runtime->dma_addr);
ssc_writel(chip->ssc->regs, PDC_TCR,
runtime->period_size * runtime->channels);
ssc_writel(chip->ssc->regs, PDC_TNPR,
(long)runtime->dma_addr + block_size);
ssc_writel(chip->ssc->regs, PDC_TNCR,
runtime->period_size * runtime->channels);
return 0;
}
static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
int retval = 0;
spin_lock(&chip->lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
break;
case SNDRV_PCM_TRIGGER_STOP:
ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
break;
default:
dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
retval = -EINVAL;
break;
}
spin_unlock(&chip->lock);
return retval;
}
static snd_pcm_uframes_t
snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_uframes_t pos;
unsigned long bytes;
bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
- (unsigned long)runtime->dma_addr;
pos = bytes_to_frames(runtime, bytes);
if (pos >= runtime->buffer_size)
pos -= runtime->buffer_size;
return pos;
}
static const struct snd_pcm_ops at73c213_playback_ops = {
.open = snd_at73c213_pcm_open,
.close = snd_at73c213_pcm_close,
.hw_params = snd_at73c213_pcm_hw_params,
.prepare = snd_at73c213_pcm_prepare,
.trigger = snd_at73c213_pcm_trigger,
.pointer = snd_at73c213_pcm_pointer,
};
static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
{
struct snd_pcm *pcm;
int retval;
retval = snd_pcm_new(chip->card, chip->card->shortname,
device, 1, 0, &pcm);
if (retval < 0)
goto out;
pcm->private_data = chip;
pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
strcpy(pcm->name, "at73c213");
chip->pcm = pcm;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
snd_pcm_set_managed_buffer_all(chip->pcm,
SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
64 * 1024, 64 * 1024);
out:
return retval;
}
static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
{
struct snd_at73c213 *chip = dev_id;
struct snd_pcm_runtime *runtime = chip->substream->runtime;
u32 status;
int offset;
int block_size;
int next_period;
int retval = IRQ_NONE;
spin_lock(&chip->lock);
block_size = frames_to_bytes(runtime, runtime->period_size);
status = ssc_readl(chip->ssc->regs, IMR);
if (status & SSC_BIT(IMR_ENDTX)) {
chip->period++;
if (chip->period == runtime->periods)
chip->period = 0;
next_period = chip->period + 1;
if (next_period == runtime->periods)
next_period = 0;
offset = block_size * next_period;
ssc_writel(chip->ssc->regs, PDC_TNPR,
(long)runtime->dma_addr + offset);
ssc_writel(chip->ssc->regs, PDC_TNCR,
runtime->period_size * runtime->channels);
retval = IRQ_HANDLED;
}
ssc_readl(chip->ssc->regs, IMR);
spin_unlock(&chip->lock);
if (status & SSC_BIT(IMR_ENDTX))
snd_pcm_period_elapsed(chip->substream);
return retval;
}
/*
* Mixer functions.
*/
static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int reg = kcontrol->private_value & 0xff;
int shift = (kcontrol->private_value >> 8) & 0xff;
int mask = (kcontrol->private_value >> 16) & 0xff;
int invert = (kcontrol->private_value >> 24) & 0xff;
mutex_lock(&chip->mixer_lock);
ucontrol->value.integer.value[0] =
(chip->reg_image[reg] >> shift) & mask;
if (invert)
ucontrol->value.integer.value[0] =
mask - ucontrol->value.integer.value[0];
mutex_unlock(&chip->mixer_lock);
return 0;
}
static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int reg = kcontrol->private_value & 0xff;
int shift = (kcontrol->private_value >> 8) & 0xff;
int mask = (kcontrol->private_value >> 16) & 0xff;
int invert = (kcontrol->private_value >> 24) & 0xff;
int change, retval;
unsigned short val;
val = (ucontrol->value.integer.value[0] & mask);
if (invert)
val = mask - val;
val <<= shift;
mutex_lock(&chip->mixer_lock);
val = (chip->reg_image[reg] & ~(mask << shift)) | val;
change = val != chip->reg_image[reg];
retval = snd_at73c213_write_reg(chip, reg, val);
mutex_unlock(&chip->mixer_lock);
if (retval)
return retval;
return change;
}
static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
int mask = (kcontrol->private_value >> 24) & 0xff;
if (mask == 1)
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
else
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 2;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = mask;
return 0;
}
static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int left_reg = kcontrol->private_value & 0xff;
int right_reg = (kcontrol->private_value >> 8) & 0xff;
int shift_left = (kcontrol->private_value >> 16) & 0x07;
int shift_right = (kcontrol->private_value >> 19) & 0x07;
int mask = (kcontrol->private_value >> 24) & 0xff;
int invert = (kcontrol->private_value >> 22) & 1;
mutex_lock(&chip->mixer_lock);
ucontrol->value.integer.value[0] =
(chip->reg_image[left_reg] >> shift_left) & mask;
ucontrol->value.integer.value[1] =
(chip->reg_image[right_reg] >> shift_right) & mask;
if (invert) {
ucontrol->value.integer.value[0] =
mask - ucontrol->value.integer.value[0];
ucontrol->value.integer.value[1] =
mask - ucontrol->value.integer.value[1];
}
mutex_unlock(&chip->mixer_lock);
return 0;
}
static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int left_reg = kcontrol->private_value & 0xff;
int right_reg = (kcontrol->private_value >> 8) & 0xff;
int shift_left = (kcontrol->private_value >> 16) & 0x07;
int shift_right = (kcontrol->private_value >> 19) & 0x07;
int mask = (kcontrol->private_value >> 24) & 0xff;
int invert = (kcontrol->private_value >> 22) & 1;
int change, retval;
unsigned short val1, val2;
val1 = ucontrol->value.integer.value[0] & mask;
val2 = ucontrol->value.integer.value[1] & mask;
if (invert) {
val1 = mask - val1;
val2 = mask - val2;
}
val1 <<= shift_left;
val2 <<= shift_right;
mutex_lock(&chip->mixer_lock);
val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
change = val1 != chip->reg_image[left_reg]
|| val2 != chip->reg_image[right_reg];
retval = snd_at73c213_write_reg(chip, left_reg, val1);
if (retval) {
mutex_unlock(&chip->mixer_lock);
goto out;
}
retval = snd_at73c213_write_reg(chip, right_reg, val2);
if (retval) {
mutex_unlock(&chip->mixer_lock);
goto out;
}
mutex_unlock(&chip->mixer_lock);
return change;
out:
return retval;
}
#define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info
static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int reg = kcontrol->private_value & 0xff;
int shift = (kcontrol->private_value >> 8) & 0xff;
int invert = (kcontrol->private_value >> 24) & 0xff;
mutex_lock(&chip->mixer_lock);
ucontrol->value.integer.value[0] =
(chip->reg_image[reg] >> shift) & 0x01;
if (invert)
ucontrol->value.integer.value[0] =
0x01 - ucontrol->value.integer.value[0];
mutex_unlock(&chip->mixer_lock);
return 0;
}
static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
int reg = kcontrol->private_value & 0xff;
int shift = (kcontrol->private_value >> 8) & 0xff;
int mask = (kcontrol->private_value >> 16) & 0xff;
int invert = (kcontrol->private_value >> 24) & 0xff;
int change, retval;
unsigned short val;
if (ucontrol->value.integer.value[0])
val = mask;
else
val = 0;
if (invert)
val = mask - val;
val <<= shift;
mutex_lock(&chip->mixer_lock);
val |= (chip->reg_image[reg] & ~(mask << shift));
change = val != chip->reg_image[reg];
retval = snd_at73c213_write_reg(chip, reg, val);
mutex_unlock(&chip->mixer_lock);
if (retval)
return retval;
return change;
}
static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;
return 0;
}
static int snd_at73c213_line_capture_volume_info(
struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 2;
/* When inverted will give values 0x10001 => 0. */
uinfo->value.integer.min = 14;
uinfo->value.integer.max = 31;
return 0;
}
static int snd_at73c213_aux_capture_volume_info(
struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
/* When inverted will give values 0x10001 => 0. */
uinfo->value.integer.min = 14;
uinfo->value.integer.max = 31;
return 0;
}
#define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \
{ \
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.name = xname, \
.index = xindex, \
.info = snd_at73c213_mono_switch_info, \
.get = snd_at73c213_mono_switch_get, \
.put = snd_at73c213_mono_switch_put, \
.private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
}
#define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
{ \
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.name = xname, \
.index = xindex, \
.info = snd_at73c213_stereo_info, \
.get = snd_at73c213_stereo_get, \
.put = snd_at73c213_stereo_put, \
.private_value = (left_reg | (right_reg << 8) \
| (shift_left << 16) | (shift_right << 19) \
| (mask << 24) | (invert << 22)) \
}
static const struct snd_kcontrol_new snd_at73c213_controls[] = {
AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
0x01, 0),
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "PA Playback Volume",
.index = 0,
.info = snd_at73c213_pa_volume_info,
.get = snd_at73c213_mono_get,
.put = snd_at73c213_mono_put,
.private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
(0x0f << 16) | (1 << 24),
},
AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
0x01, 1),
AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "Aux Capture Volume",
.index = 0,
.info = snd_at73c213_aux_capture_volume_info,
.get = snd_at73c213_mono_get,
.put = snd_at73c213_mono_put,
.private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
},
AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
0x01, 0),
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "Line Capture Volume",
.index = 0,
.info = snd_at73c213_line_capture_volume_info,
.get = snd_at73c213_stereo_get,
.put = snd_at73c213_stereo_put,
.private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
| (0x1f << 24) | (1 << 22),
},
AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
};
static int snd_at73c213_mixer(struct snd_at73c213 *chip)
{
struct snd_card *card;
int errval, idx;
if (chip == NULL || chip->pcm == NULL)
return -EINVAL;
card = chip->card;
strcpy(card->mixername, chip->pcm->name);
for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
errval = snd_ctl_add(card,
snd_ctl_new1(&snd_at73c213_controls[idx],
chip));
if (errval < 0)
goto cleanup;
}
return 0;
cleanup:
for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
struct snd_kcontrol *kctl;
kctl = snd_ctl_find_numid(card, idx);
if (kctl)
snd_ctl_remove(card, kctl);
}
return errval;
}
/*
* Device functions
*/
static int snd_at73c213_ssc_init(struct snd_at73c213 *chip)
{
/*
* Continuous clock output.
* Starts on falling TF.
* Delay 1 cycle (1 bit).
* Periode is 16 bit (16 - 1).
*/
ssc_writel(chip->ssc->regs, TCMR,
SSC_BF(TCMR_CKO, 1)
| SSC_BF(TCMR_START, 4)
| SSC_BF(TCMR_STTDLY, 1)
| SSC_BF(TCMR_PERIOD, 16 - 1));
/*
* Data length is 16 bit (16 - 1).
* Transmit MSB first.
* Transmit 2 words each transfer.
* Frame sync length is 16 bit (16 - 1).
* Frame starts on negative pulse.
*/
ssc_writel(chip->ssc->regs, TFMR,
SSC_BF(TFMR_DATLEN, 16 - 1)
| SSC_BIT(TFMR_MSBF)
| SSC_BF(TFMR_DATNB, 1)
| SSC_BF(TFMR_FSLEN, 16 - 1)
| SSC_BF(TFMR_FSOS, 1));
return 0;
}
static int snd_at73c213_chip_init(struct snd_at73c213 *chip)
{
int retval;
unsigned char dac_ctrl = 0;
retval = snd_at73c213_set_bitrate(chip);
if (retval)
goto out;
/* Enable DAC master clock. */
clk_enable(chip->board->dac_clk);
/* Initialize at73c213 on SPI bus. */
retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
if (retval)
goto out_clk;
msleep(1);
retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
if (retval)
goto out_clk;
/* Precharge everything. */
retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_CTRL,
(1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
if (retval)
goto out_clk;
msleep(50);
/* Stop precharging PA. */
retval = snd_at73c213_write_reg(chip, PA_CTRL,
(1<<PA_CTRL_APALP) | 0x0f);
if (retval)
goto out_clk;
msleep(450);
/* Stop precharging DAC, turn on master power. */
retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
if (retval)
goto out_clk;
msleep(1);
/* Turn on DAC. */
dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
| (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
if (retval)
goto out_clk;
/* Mute sound. */
retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
if (retval)
goto out_clk;
retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
if (retval)
goto out_clk;
/* Enable I2S device, i.e. clock output. */
ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
goto out;
out_clk:
clk_disable(chip->board->dac_clk);
out:
return retval;
}
static int snd_at73c213_dev_free(struct snd_device *device)
{
struct snd_at73c213 *chip = device->device_data;
ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
if (chip->irq >= 0) {
free_irq(chip->irq, chip);
chip->irq = -1;
}
return 0;
}
static int snd_at73c213_dev_init(struct snd_card *card,
struct spi_device *spi)
{
static const struct snd_device_ops ops = {
.dev_free = snd_at73c213_dev_free,
};
struct snd_at73c213 *chip = get_chip(card);
int irq, retval;
irq = chip->ssc->irq;
if (irq < 0)
return irq;
spin_lock_init(&chip->lock);
mutex_init(&chip->mixer_lock);
chip->card = card;
chip->irq = -1;
clk_enable(chip->ssc->clk);
retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
if (retval) {
dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
goto out;
}
chip->irq = irq;
memcpy(&chip->reg_image, &snd_at73c213_original_image,
sizeof(snd_at73c213_original_image));
retval = snd_at73c213_ssc_init(chip);
if (retval)
goto out_irq;
retval = snd_at73c213_chip_init(chip);
if (retval)
goto out_irq;
retval = snd_at73c213_pcm_new(chip, 0);
if (retval)
goto out_irq;
retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
if (retval)
goto out_irq;
retval = snd_at73c213_mixer(chip);
if (retval)
goto out_snd_dev;
goto out;
out_snd_dev:
snd_device_free(card, chip);
out_irq:
free_irq(chip->irq, chip);
chip->irq = -1;
out:
clk_disable(chip->ssc->clk);
return retval;
}
static int snd_at73c213_probe(struct spi_device *spi)
{
struct snd_card *card;
struct snd_at73c213 *chip;
struct at73c213_board_info *board;
int retval;
char id[16];
board = spi->dev.platform_data;
if (!board) {
dev_dbg(&spi->dev, "no platform_data\n");
return -ENXIO;
}
if (!board->dac_clk) {
dev_dbg(&spi->dev, "no DAC clk\n");
return -ENXIO;
}
if (IS_ERR(board->dac_clk)) {
dev_dbg(&spi->dev, "no DAC clk\n");
return PTR_ERR(board->dac_clk);
}
/* Allocate "card" using some unused identifiers. */
snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE,
sizeof(struct snd_at73c213), &card);
if (retval < 0)
goto out;
chip = card->private_data;
chip->spi = spi;
chip->board = board;
chip->ssc = ssc_request(board->ssc_id);
if (IS_ERR(chip->ssc)) {
dev_dbg(&spi->dev, "could not get ssc%d device\n",
board->ssc_id);
retval = PTR_ERR(chip->ssc);
goto out_card;
}
retval = snd_at73c213_dev_init(card, spi);
if (retval)
goto out_ssc;
strcpy(card->driver, "at73c213");
strcpy(card->shortname, board->shortname);
sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
retval = snd_card_register(card);
if (retval)
goto out_ssc;
dev_set_drvdata(&spi->dev, card);
goto out;
out_ssc:
ssc_free(chip->ssc);
out_card:
snd_card_free(card);
out: