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/* i.MX AK5558 audio support
*
* Copyright 2017 NXP
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/of_device.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/pcm.h>
#include <sound/soc-dapm.h>
#include "fsl_sai.h"
#include "../codecs/ak5558.h"
struct imx_ak5558_data {
struct snd_soc_card card;
bool tdm_mode;
unsigned long slots;
unsigned long slot_width;
bool one2one_ratio;
};
/*
* imx_ack5558_fs_mul - sampling frequency multiplier
*
* min <= fs <= max, MCLK = mul * LRCK
*/
struct imx_ak5558_fs_mul {
unsigned int min;
unsigned int max;
unsigned int mul;
};
/*
* Auto MCLK selection based on LRCK for Normal Mode
* (Table 4 from datasheet)
*/
static const struct imx_ak5558_fs_mul fs_mul[] = {
{ .min = 8000, .max = 32000, .mul = 1024 },
{ .min = 44100, .max = 48000, .mul = 512 },
{ .min = 88200, .max = 96000, .mul = 256 },
{ .min = 176400, .max = 192000, .mul = 128 },
{ .min = 352800, .max = 384000, .mul = 64 },
{ .min = 705600, .max = 768000, .mul = 32 },
};
/*
* MCLK and BCLK selection based on TDM mode
* because of SAI we also add the restriction: MCLK >= 2 * BCLK
* (Table 9 from datasheet)
*/
static const struct imx_ak5558_fs_mul fs_mul_tdm[] = {
{ .min = 128, .max = 128, .mul = 256 },
{ .min = 256, .max = 256, .mul = 512 },
{ .min = 512, .max = 512, .mul = 1024 },
};
static struct snd_soc_dapm_widget imx_ak5558_dapm_widgets[] = {
SND_SOC_DAPM_LINE("Line In", NULL),
};
static const u32 ak5558_rates[] = {
8000, 11025, 16000, 22050,
32000, 44100, 48000, 88200,
96000, 176400, 192000, 352800,
384000, 705600, 768000,
};
static const u32 ak5558_tdm_rates[] = {
8000, 16000, 32000,
48000, 96000
};
static const u32 ak5558_channels[] = {
1, 2, 4, 6, 8,
};
static unsigned long ak5558_get_mclk_rate(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_ak5558_data *data = snd_soc_card_get_drvdata(rtd->card);
unsigned int rate = params_rate(params);
unsigned int freq = 0; /* Let DAI manage clk frequency by default */
int mode;
int i;
if (data->tdm_mode) {
mode = data->slots * data->slot_width;
for (i = 0; i < ARRAY_SIZE(fs_mul_tdm); i++) {
/* min = max = slots * slots_width */
if (mode != fs_mul_tdm[i].min)
continue;
freq = rate * fs_mul_tdm[i].mul;
break;
}
} else {
for (i = 0; i < ARRAY_SIZE(fs_mul); i++) {
if (rate < fs_mul[i].min || rate > fs_mul[i].max)
continue;
freq = rate * fs_mul[i].mul;
break;
}
}
return freq;
}
static int imx_aif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct snd_soc_dai *codec_dai = rtd->codec_dai;
struct snd_soc_card *card = rtd->card;
struct device *dev = card->dev;
struct imx_ak5558_data *data = snd_soc_card_get_drvdata(card);
unsigned int channels = params_channels(params);
unsigned long mclk_freq;
unsigned int fmt;
int ret;
if (data->tdm_mode)
fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS;
else
fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBS_CFS;
ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
if (ret) {
dev_err(dev, "failed to set cpu dai fmt: %d\n", ret);
return ret;
}
ret = snd_soc_dai_set_fmt(codec_dai, fmt);
if (ret) {
dev_err(dev, "failed to set codec dai fmt: %d\n", ret);
return ret;
}
if (data->tdm_mode) {
/* support TDM256 (8 slots * 32 bits/per slot) */
data->slots = 8;
data->slot_width = 32;
ret = snd_soc_dai_set_tdm_slot(cpu_dai,
BIT(channels) - 1, BIT(channels) - 1,
data->slots, data->slot_width);
if (ret) {
dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
return ret;
}
ret = snd_soc_dai_set_tdm_slot(codec_dai,
BIT(channels) - 1, BIT(channels) - 1,
8, 32);
if (ret) {
dev_err(dev, "failed to set codec dai fmt: %d\n", ret);
return ret;
}
} else {
/* normal mode (I2S) */
data->slots = 2;
data->slot_width = params_physical_width(params);
ret = snd_soc_dai_set_tdm_slot(cpu_dai,
BIT(channels) - 1, BIT(channels) - 1,
data->slots, data->slot_width);
if (ret) {
dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
return ret;
}
}
mclk_freq = ak5558_get_mclk_rate(substream, params);
ret = snd_soc_dai_set_sysclk(cpu_dai, FSL_SAI_CLK_MAST1, mclk_freq,
SND_SOC_CLOCK_OUT);
if (ret < 0)
dev_err(dev, "failed to set cpu_dai mclk1 rate %lu\n",
mclk_freq);
return ret;
}
static int imx_ak5558_hw_rule_rate(struct snd_pcm_hw_params *p,
struct snd_pcm_hw_rule *r)
{
struct imx_ak5558_data *data = r->private;
struct snd_interval t = { .min = 8000, .max = 8000, };
unsigned int fs;
unsigned long mclk_freq;
int i;
fs = hw_param_interval(p, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
fs *= data->tdm_mode ? 8 : 2;
/* Identify maximum supported rate */
for (i = 0; i < ARRAY_SIZE(ak5558_rates); i++) {
mclk_freq = fs * ak5558_rates[i];
/* Adjust SAI bclk:mclk ratio */
mclk_freq *= data->one2one_ratio ? 1 : 2;
/* Skip rates for which MCLK is beyond supported value */
if (mclk_freq > 36864000)
continue;
if (t.max < ak5558_rates[i])
t.max = ak5558_rates[i];
}
return snd_interval_refine(hw_param_interval(p, r->var), &t);
}
static int imx_aif_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_card *card = rtd->card;
struct imx_ak5558_data *data = snd_soc_card_get_drvdata(card);
static struct snd_pcm_hw_constraint_list constraint_rates;
static struct snd_pcm_hw_constraint_list constraint_channels;
int ret;
if (data->tdm_mode) {
constraint_rates.list = ak5558_tdm_rates;
constraint_rates.count = ARRAY_SIZE(ak5558_tdm_rates);
} else {
constraint_rates.list = ak5558_rates;
constraint_rates.count = ARRAY_SIZE(ak5558_rates);
}
ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&constraint_rates);
if (ret)
return ret;
constraint_channels.list = ak5558_channels;
constraint_channels.count = ARRAY_SIZE(ak5558_channels);
ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
&constraint_channels);
if (ret < 0)
return ret;
return snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, imx_ak5558_hw_rule_rate, data,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
}
static struct snd_soc_ops imx_aif_ops = {
.hw_params = imx_aif_hw_params,
.startup = imx_aif_startup,
};
static struct snd_soc_dai_link imx_ak5558_dai = {
.name = "ak5558",
.stream_name = "Audio",
.codec_dai_name = "ak5558-aif",
.ops = &imx_aif_ops,
.capture_only = 1,
};
static int imx_ak5558_probe(struct platform_device *pdev)
{
struct imx_ak5558_data *priv;
struct device_node *cpu_np, *codec_np = NULL;
struct platform_device *cpu_pdev;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
cpu_np = of_parse_phandle(pdev->dev.of_node, "audio-cpu", 0);
if (!cpu_np) {
dev_err(&pdev->dev, "audio dai phandle missing or invalid\n");
ret = -EINVAL;
goto fail;
}
codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
if (!codec_np) {
dev_err(&pdev->dev, "audio codec phandle missing or invalid\n");
ret = -EINVAL;
goto fail;
}
cpu_pdev = of_find_device_by_node(cpu_np);
if (!cpu_pdev) {
dev_err(&pdev->dev, "failed to find SAI platform device\n");
ret = -EINVAL;
goto fail;
}
if (of_find_property(pdev->dev.of_node, "fsl,tdm", NULL))
priv->tdm_mode = true;
imx_ak5558_dai.codec_of_node = codec_np;
imx_ak5558_dai.cpu_dai_name = dev_name(&cpu_pdev->dev);
imx_ak5558_dai.platform_of_node = cpu_np;
imx_ak5558_dai.capture_only = 1;
priv->card.dai_link = &imx_ak5558_dai;
priv->card.num_links = 1;
priv->card.dev = &pdev->dev;
priv->card.owner = THIS_MODULE;
priv->card.dapm_widgets = imx_ak5558_dapm_widgets;
priv->card.num_dapm_widgets = ARRAY_SIZE(imx_ak5558_dapm_widgets);
priv->one2one_ratio = !of_device_is_compatible(pdev->dev.of_node,
"fsl,imx-audio-ak5558-mq");
ret = snd_soc_of_parse_card_name(&priv->card, "model");
if (ret)
goto fail;
snd_soc_card_set_drvdata(&priv->card, priv);
ret = devm_snd_soc_register_card(&pdev->dev, &priv->card);
if (ret) {
dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
goto fail;
}
ret = 0;
fail:
if (cpu_np)
of_node_put(cpu_np);
if (codec_np)
of_node_put(codec_np);
return ret;
}
static const struct of_device_id imx_ak5558_dt_ids[] = {
{ .compatible = "fsl,imx-audio-ak5558", },
{ .compatible = "fsl,imx-audio-ak5558-mq", },
{ },
};
MODULE_DEVICE_TABLE(of, imx_ak5558_dt_ids);
static struct platform_driver imx_ak5558_driver = {
.driver = {
.name = "imx-ak5558",
.pm = &snd_soc_pm_ops,
.of_match_table = imx_ak5558_dt_ids,
},
.probe = imx_ak5558_probe,
};
module_platform_driver(imx_ak5558_driver);
MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
MODULE_DESCRIPTION("Freescale i.MX AK5558 ASoC machine driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-ak5558");