Hi:
I'm working in a project of making an audio cape for beaglebone black with pcm3168 codec... so far i've written the driver i've attached based on pcm1681.c available in linux kernel.
Im a noob in this subjets, so i would like to know how can now make it work in my custom system for the beaglebone.
I followed the guide in this link http://processors.wiki.ti.com/index.php/Sitara_Linux_Audio_DAC_Example, but it makes me write the ops and hw structures that i already have in my pcm3168.c file, in the davinci_evm.c file.
The drivers compiles and is detected at boot time, as it says in the guide. But when i type aplay command to play some wav, the message "ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM default
aplay: main:722: audio open error: No such file or directory" appears, so i'm missing something...
I don't knwo if this post belongs to this list, but any help would be great...
If some docummentation about writing a driver for an embedded system is available, please tell me...
Also, if someone can suggest me some guidelines of work i would be grateful, cause i just can't get organized with the information i found
Thanks very Much...
Pablo
/*
* PCM3168 ASoC codec driver
*
* 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.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#define PCM3168_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S24_LE)
#define PCM3168_PCM_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
SNDRV_PCM_RATE_96000)
#define PCM3168_DEEMPH_CONTROL 0x46
#define PCM3168_ATT_CONTROL(X) (X <=6 ? X : X+9)
#define PCM3168_SOFT_MUTE_CONTROL 0x44
#define PCM3168_DAC_FMT_CONTROL 0x41
#define PCM3168_DEEMPH_MASK 0x01
#define PCM3168_DEEMPH_RATE_MASK 0x30
static const struct reg_default pcm3168_reg_defaults[] = {
{ 0x40, 0xC2 },
{ 0x41, 0x06 },
{ 0x42, 0x00 },
{ 0x43, 0x00 },
{ 0x44, 0x00 },
{ 0x46, 0x18 },
{ 0x47, 0xff },
{ 0x48, 0xff },
{ 0x49, 0xff },
{ 0x4A, 0xff },
{ 0x4B, 0xff },
{ 0x4C, 0xff },
{ 0x4D, 0xff },
{ 0x4E, 0xff },
{ 0x4F, 0xff },
{ 0x50, 0x02 },
{ 0x51, 0x06 },
{ 0x52, 0x00 },
{ 0x53, 0x00 },
{ 0x54, 0x00 },
{ 0x55, 0x00 },
{ 0x57, 0x00 },
{ 0x58, 0xD7 },
{ 0x59, 0xD7 },
{ 0x5A, 0xD7 },
{ 0x5B, 0xD7 },
{ 0x5C, 0xD7 },
{ 0x5D, 0xD7 },
{ 0x5E, 0xD7 },
};
static bool pcm3168_accessible_reg(struct device *dev, unsigned int reg)
{
return !((reg < 0x40) || (reg > 0x5E));
}
static bool pcm3168_writeable_reg(struct device *dev, unsigned register reg)
{
return pcm3168_accessible_reg(dev, reg) &&
(reg != 0x45) && (reg != 56);
}
struct pcm3168_private {
struct regmap *regmap;
unsigned int format;
/* Current deemphasis status */
unsigned int deemph;
/* Current rate for deemphasis control */
unsigned int rate;
};
static const int pcm3168_deemph[] = {0, 44100, 48000, 32000 };
static int pcm3168_set_deemph(struct snd_soc_codec *codec)
{
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
int i = 0, val = -1;
if (priv->deemph)
for (i = 0; i < ARRAY_SIZE(pcm3168_deemph); i++)
if (pcm3168_deemph[i] == priv->rate)
val = i;
return regmap_update_bits(priv->regmap, PCM3168_DEEMPH_CONTROL,
PCM3168_DEEMPH_RATE_MASK, val << 4);
}
static int pcm3168_get_deemph(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
ucontrol->value.integer.value[0] = priv->deemph;
return 0;
}
static int pcm3168_put_deemph(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
priv->deemph = ucontrol->value.integer.value[0];
return pcm3168_set_deemph(codec);
}
static int pcm3168_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
priv->format = format;
return 0;
}
static int pcm3168_digital_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
int val=mute;
return regmap_write(priv->regmap, PCM3168_SOFT_MUTE_CONTROL, val);
}
static int pcm3168_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct pcm3168_private *priv = snd_soc_codec_get_drvdata(codec);
int val = 0, ret;
priv->rate = params_rate(params);
switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
switch (params_width(params)) {
case 24:
val = 0x02;
break;
case 16:
val = 0x03;
break;
default:
return -EINVAL;
}
break;
case SND_SOC_DAIFMT_I2S:
val = 0x00;
break;
case SND_SOC_DAIFMT_LEFT_J:
val = 0x01;
default:
dev_err(codec->dev, "Invalid DAI format\n");
return -EINVAL;
}
ret = regmap_update_bits(priv->regmap, PCM3168_DAC_FMT_CONTROL, 0x0f, val);
if (ret < 0)
return ret;
return pcm3168_set_deemph(codec);
}
static const struct snd_soc_dai_ops pcm3168_dai_ops = {
.set_fmt = pcm3168_set_dai_fmt,
.hw_params = pcm3168_hw_params,
.digital_mute = pcm3168_digital_mute,
};
static const struct snd_soc_dapm_widget pcm3168_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("VOUT1"),
SND_SOC_DAPM_OUTPUT("VOUT2"),
SND_SOC_DAPM_OUTPUT("VOUT3"),
SND_SOC_DAPM_OUTPUT("VOUT4"),
SND_SOC_DAPM_OUTPUT("VOUT5"),
SND_SOC_DAPM_OUTPUT("VOUT6"),
SND_SOC_DAPM_OUTPUT("VOUT7"),
SND_SOC_DAPM_OUTPUT("VOUT8"),
SND_SOC_DAPM_INPUT("VIN1"),
SND_SOC_DAPM_INPUT("VIN2"),
SND_SOC_DAPM_INPUT("VIN3"),
SND_SOC_DAPM_INPUT("VIN4"),
SND_SOC_DAPM_INPUT("VIN5"),
SND_SOC_DAPM_INPUT("VIN6"),
};
static const struct snd_soc_dapm_route pcm3168_dapm_routes[] = {
{ "VOUT1", NULL, "Playback" },
{ "VOUT2", NULL, "Playback" },
{ "VOUT3", NULL, "Playback" },
{ "VOUT4", NULL, "Playback" },
{ "VOUT5", NULL, "Playback" },
{ "VOUT6", NULL, "Playback" },
{ "VOUT7", NULL, "Playback" },
{ "VOUT8", NULL, "Playback" },
{ "VIN1", NULL, "Capture" },
{ "VIN2", NULL, "Capture" },
{ "VIN3", NULL, "Capture" },
{ "VIN4", NULL, "Capture" },
{ "VIN5", NULL, "Capture" },
{ "VIN6", NULL, "Capture" },
};
static const DECLARE_TLV_DB_SCALE(pcm3168_dac_tlv, -6350, 50, 1);
static const DECLARE_TLV_DB_SCALE(pcm3168_adc_tlv, -6350, 50, 1);
static const struct snd_kcontrol_new pcm3168_controls[] = {
SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
PCM3168_ATT_CONTROL(1), PCM3168_ATT_CONTROL(2), 0,
0x7f, 0, pcm3168_dac_tlv),
SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
PCM3168_ATT_CONTROL(3), PCM3168_ATT_CONTROL(4), 0,
0x7f, 0, pcm3168_dac_tlv),
SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
PCM3168_ATT_CONTROL(5), PCM3168_ATT_CONTROL(6), 0,
0x7f, 0, pcm3168_dac_tlv),
SOC_DOUBLE_R_TLV("Channel 7/8 Playback Volume",
PCM3168_ATT_CONTROL(7), PCM3168_ATT_CONTROL(8), 0,
0x7f, 0, pcm3168_dac_tlv),
SOC_DOUBLE_R_TLV("Channel 1/2 Capture Volume",
PCM3168_ATT_CONTROL(9), PCM3168_ATT_CONTROL(10), 0,
0x7f, 0, pcm3168_adc_tlv),
SOC_DOUBLE_R_TLV("Channel 3/4 Capture Volume",
PCM3168_ATT_CONTROL(11), PCM3168_ATT_CONTROL(12), 0,
0x7f, 0, pcm3168_adc_tlv),
SOC_DOUBLE_R_TLV("Channel 5/6 Capture Volume",
PCM3168_ATT_CONTROL(13), PCM3168_ATT_CONTROL(14), 0,
0x7f, 0, pcm3168_adc_tlv),
SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
pcm3168_get_deemph, pcm3168_put_deemph),
};
static struct snd_soc_dai_driver pcm3168_dai = {
.name = "pcm3168-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 8,
.rates = PCM3168_PCM_RATES,
.formats = PCM3168_PCM_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 6,
.rates = PCM3168_PCM_RATES,
.formats = PCM3168_PCM_FORMATS,
},
.ops = &pcm3168_dai_ops,
};
#ifdef CONFIG_OF
static const struct of_device_id pcm3168_dt_ids[] = {
{ .compatible = "ti,pcm3168", },
{ }
};
MODULE_DEVICE_TABLE(of, pcm3168_dt_ids);
#endif
static const struct regmap_config pcm3168_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x5E,
.reg_defaults = pcm3168_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(pcm3168_reg_defaults),
.writeable_reg = pcm3168_writeable_reg,
.readable_reg = pcm3168_accessible_reg,
};
static struct snd_soc_codec_driver soc_codec_dev_pcm3168 = {
.controls = pcm3168_controls,
.num_controls = ARRAY_SIZE(pcm3168_controls),
.dapm_widgets = pcm3168_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(pcm3168_dapm_widgets),
.dapm_routes = pcm3168_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(pcm3168_dapm_routes),
};
static const struct i2c_device_id pcm3168_i2c_id[] = {
{"pcm3168", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, pcm3168_i2c_id);
static int pcm3168_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct pcm3168_private *priv;
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init_i2c(client, &pcm3168_regmap);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&client->dev, "Failed to create regmap: %d\n", ret);
return ret;
}
i2c_set_clientdata(client, priv);
return snd_soc_register_codec(&client->dev, &soc_codec_dev_pcm3168,
&pcm3168_dai, 1);
}
static int pcm3168_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
return 0;
}
static struct i2c_driver pcm3168_i2c_driver = {
.driver = {
.name = "pcm3168",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(pcm3168_dt_ids),
},
.id_table = pcm3168_i2c_id,
.probe = pcm3168_i2c_probe,
.remove = pcm3168_i2c_remove,
};
module_i2c_driver(pcm3168_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments PCM3168 ALSA SoC Codec Driver");
MODULE_AUTHOR("Pablo Fonovich");
MODULE_LICENSE("GPL");
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