270 lines
6.9 KiB
C
270 lines
6.9 KiB
C
/* i.MX AK4458 audio support
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*
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* Copyright 2017 NXP
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <sound/soc.h>
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#include <sound/pcm_params.h>
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#include <sound/soc-dapm.h>
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#include "fsl_sai.h"
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struct imx_ak4497_data {
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struct snd_soc_card card;
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bool one2one_ratio;
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};
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static struct snd_soc_dapm_widget imx_ak4497_dapm_widgets[] = {
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SND_SOC_DAPM_LINE("Line Out", NULL),
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};
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static const struct imx_ak4497_fs_mul {
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unsigned int min;
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unsigned int max;
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unsigned int mul;
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} fs_mul[] = {
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/**
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* Table 7 - mapping multiplier and speed mode
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* Tables 8 & 9 - mapping speed mode and LRCK fs
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*/
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{ .min = 8000, .max = 32000, .mul = 1024 }, /* Normal, <= 32kHz */
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{ .min = 44100, .max = 48000, .mul = 512 }, /* Normal */
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{ .min = 88200, .max = 96000, .mul = 256 }, /* Double */
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{ .min = 176400, .max = 192000, .mul = 128 }, /* Quad */
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{ .min = 352800, .max = 384000, .mul = 2*64 }, /* Oct */
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{ .min = 705600, .max = 768000, .mul = 2*32 }, /* Hex */
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};
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static bool imx_ak4497_is_dsd(struct snd_pcm_hw_params *params)
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{
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snd_pcm_format_t format = params_format(params);
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switch (format) {
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case SNDRV_PCM_FORMAT_DSD_U8:
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case SNDRV_PCM_FORMAT_DSD_U16_LE:
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case SNDRV_PCM_FORMAT_DSD_U16_BE:
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case SNDRV_PCM_FORMAT_DSD_U32_LE:
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case SNDRV_PCM_FORMAT_DSD_U32_BE:
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return true;
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default:
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return false;
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}
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}
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static unsigned long imx_ak4497_compute_freq(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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unsigned int rate = params_rate(params);
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int i;
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/* Find the appropriate MCLK freq */
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for (i = 0; i < ARRAY_SIZE(fs_mul); i++) {
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if (rate >= fs_mul[i].min && rate <= fs_mul[i].max)
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return rate * fs_mul[i].mul;
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}
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/* Let DAI manage MCLK frequency */
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return 0;
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}
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static int imx_aif_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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struct snd_soc_dai *codec_dai = rtd->codec_dai;
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struct snd_soc_card *card = rtd->card;
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struct device *dev = card->dev;
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struct imx_ak4497_data *priv = snd_soc_card_get_drvdata(card);
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unsigned int channels = params_channels(params);
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unsigned int fmt = SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS;
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unsigned long freq = imx_ak4497_compute_freq(substream, params);
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bool is_dsd = imx_ak4497_is_dsd(params);
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int ret;
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fmt |= (is_dsd ? SND_SOC_DAIFMT_PDM : SND_SOC_DAIFMT_I2S);
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if (is_dsd && freq > 22579200 && priv->one2one_ratio)
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freq = 22579200;
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ret = snd_soc_dai_set_sysclk(cpu_dai, FSL_SAI_CLK_MAST1, freq,
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SND_SOC_CLOCK_OUT);
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if (ret < 0) {
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dev_err(dev, "failed to set cpu dai mclk1 rate(%lu): %d\n",
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freq, ret);
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return ret;
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}
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ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
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if (ret) {
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dev_err(dev, "failed to set cpu dai fmt: %d\n", ret);
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return ret;
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}
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ret = snd_soc_dai_set_fmt(codec_dai, fmt);
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if (ret) {
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dev_err(dev, "failed to set codec dai fmt: %d\n", ret);
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return ret;
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}
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if (is_dsd)
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ret = snd_soc_dai_set_tdm_slot(cpu_dai,
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0x1, 0x1,
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1, params_width(params));
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else
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ret = snd_soc_dai_set_tdm_slot(cpu_dai,
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BIT(channels) - 1, BIT(channels) - 1,
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2, params_physical_width(params));
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if (ret) {
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dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
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return ret;
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}
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return ret;
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}
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static const u32 support_rates[] = {
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8000, 11025, 16000, 22050,
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32000, 44100, 48000, 88200,
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96000, 176400, 192000, 352800,
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384000, 705600, 768000,
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};
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static int imx_aif_startup(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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int ret = 0;
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static struct snd_pcm_hw_constraint_list constraint_rates;
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constraint_rates.list = support_rates;
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constraint_rates.count = ARRAY_SIZE(support_rates);
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ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
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&constraint_rates);
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if (ret)
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return ret;
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return ret;
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}
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static struct snd_soc_ops imx_aif_ops = {
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.startup = imx_aif_startup,
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.hw_params = imx_aif_hw_params,
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};
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SND_SOC_DAILINK_DEFS(hifi,
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DAILINK_COMP_ARRAY(COMP_EMPTY()),
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DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "ak4497-aif")),
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DAILINK_COMP_ARRAY(COMP_EMPTY()));
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static struct snd_soc_dai_link imx_ak4497_dai = {
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.name = "ak4497",
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.stream_name = "Audio",
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.ops = &imx_aif_ops,
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.playback_only = 1,
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SND_SOC_DAILINK_REG(hifi),
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};
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static int imx_ak4497_probe(struct platform_device *pdev)
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{
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struct imx_ak4497_data *priv;
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struct device_node *cpu_np, *codec_np = NULL;
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struct platform_device *cpu_pdev;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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cpu_np = of_parse_phandle(pdev->dev.of_node, "audio-cpu", 0);
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if (!cpu_np) {
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dev_err(&pdev->dev, "audio dai phandle missing or invalid\n");
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ret = -EINVAL;
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goto fail;
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}
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codec_np = of_parse_phandle(pdev->dev.of_node, "audio-codec", 0);
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if (!codec_np) {
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dev_err(&pdev->dev, "audio codec phandle missing or invalid\n");
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ret = -EINVAL;
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goto fail;
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}
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cpu_pdev = of_find_device_by_node(cpu_np);
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if (!cpu_pdev) {
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dev_err(&pdev->dev, "failed to find SAI platform device\n");
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ret = -EINVAL;
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goto fail;
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}
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imx_ak4497_dai.codecs->of_node = codec_np;
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imx_ak4497_dai.cpus->dai_name = dev_name(&cpu_pdev->dev);
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imx_ak4497_dai.platforms->of_node = cpu_np;
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imx_ak4497_dai.playback_only = 1;
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priv->card.dai_link = &imx_ak4497_dai;
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priv->card.num_links = 1;
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priv->card.dev = &pdev->dev;
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priv->card.owner = THIS_MODULE;
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priv->card.dapm_widgets = imx_ak4497_dapm_widgets;
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priv->card.num_dapm_widgets = ARRAY_SIZE(imx_ak4497_dapm_widgets);
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priv->one2one_ratio = !of_device_is_compatible(pdev->dev.of_node,
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"fsl,imx-audio-ak4497-mq");
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ret = snd_soc_of_parse_card_name(&priv->card, "model");
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if (ret)
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goto fail;
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snd_soc_card_set_drvdata(&priv->card, priv);
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ret = devm_snd_soc_register_card(&pdev->dev, &priv->card);
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if (ret) {
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dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
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goto fail;
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}
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ret = 0;
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fail:
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if (cpu_np)
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of_node_put(cpu_np);
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if (codec_np)
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of_node_put(codec_np);
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return ret;
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}
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static const struct of_device_id imx_ak4497_dt_ids[] = {
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{ .compatible = "fsl,imx-audio-ak4497", },
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{ .compatible = "fsl,imx-audio-ak4497-mq", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, imx_ak4497_dt_ids);
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static struct platform_driver imx_ak4497_driver = {
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.driver = {
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.name = "imx-ak4497",
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.pm = &snd_soc_pm_ops,
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.of_match_table = imx_ak4497_dt_ids,
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},
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.probe = imx_ak4497_probe,
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};
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module_platform_driver(imx_ak4497_driver);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@nxp.com>");
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MODULE_DESCRIPTION("Freescale i.MX AK4497 ASoC machine driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:imx-ak4497");
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