2018-01-10 10:13:15 +00:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* This file is part of STM32 DFSDM ASoC DAI driver
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*
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
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* Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
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* Olivier Moysan <olivier.moysan@st.com>
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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/platform_device.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/adc/stm32-dfsdm-adc.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#define STM32_ADFSDM_DRV_NAME "stm32-adfsdm"
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#define DFSDM_MAX_PERIOD_SIZE (PAGE_SIZE / 2)
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#define DFSDM_MAX_PERIODS 6
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struct stm32_adfsdm_priv {
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struct snd_soc_dai_driver dai_drv;
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struct snd_pcm_substream *substream;
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struct device *dev;
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/* IIO */
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struct iio_channel *iio_ch;
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struct iio_cb_buffer *iio_cb;
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bool iio_active;
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/* PCM buffer */
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unsigned char *pcm_buff;
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unsigned int pos;
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};
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static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = {
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.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_PAUSE,
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.formats = SNDRV_PCM_FMTBIT_S32_LE,
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.rate_min = 8000,
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.rate_max = 32000,
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.channels_min = 1,
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.channels_max = 1,
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.periods_min = 2,
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.periods_max = DFSDM_MAX_PERIODS,
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.period_bytes_max = DFSDM_MAX_PERIOD_SIZE,
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.buffer_bytes_max = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE
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};
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static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
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if (priv->iio_active) {
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iio_channel_stop_all_cb(priv->iio_cb);
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priv->iio_active = false;
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}
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}
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static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
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int ret;
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ret = iio_write_channel_attribute(priv->iio_ch,
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substream->runtime->rate, 0,
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IIO_CHAN_INFO_SAMP_FREQ);
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if (ret < 0) {
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dev_err(dai->dev, "%s: Failed to set %d sampling rate\n",
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__func__, substream->runtime->rate);
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return ret;
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}
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if (!priv->iio_active) {
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ret = iio_channel_start_all_cb(priv->iio_cb);
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if (!ret)
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priv->iio_active = true;
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else
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dev_err(dai->dev, "%s: IIO channel start failed (%d)\n",
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__func__, ret);
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}
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return ret;
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}
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static int stm32_adfsdm_set_sysclk(struct snd_soc_dai *dai, int clk_id,
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unsigned int freq, int dir)
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{
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struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
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ssize_t size;
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char str_freq[10];
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dev_dbg(dai->dev, "%s: Enter for freq %d\n", __func__, freq);
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/* Set IIO frequency if CODEC is master as clock comes from SPI_IN */
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snprintf(str_freq, sizeof(str_freq), "%d\n", freq);
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size = iio_write_channel_ext_info(priv->iio_ch, "spi_clk_freq",
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str_freq, sizeof(str_freq));
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if (size != sizeof(str_freq)) {
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dev_err(dai->dev, "%s: Failed to set SPI clock\n",
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__func__);
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return -EINVAL;
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}
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return 0;
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}
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static const struct snd_soc_dai_ops stm32_adfsdm_dai_ops = {
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.shutdown = stm32_adfsdm_shutdown,
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.prepare = stm32_adfsdm_dai_prepare,
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.set_sysclk = stm32_adfsdm_set_sysclk,
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};
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static const struct snd_soc_dai_driver stm32_adfsdm_dai = {
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.capture = {
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.channels_min = 1,
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.channels_max = 1,
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.formats = SNDRV_PCM_FMTBIT_S32_LE,
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.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
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SNDRV_PCM_RATE_32000),
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},
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.ops = &stm32_adfsdm_dai_ops,
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};
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static const struct snd_soc_component_driver stm32_adfsdm_dai_component = {
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.name = "stm32_dfsdm_audio",
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};
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static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)
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{
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struct stm32_adfsdm_priv *priv = private;
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struct snd_soc_pcm_runtime *rtd = priv->substream->private_data;
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u8 *pcm_buff = priv->pcm_buff;
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u8 *src_buff = (u8 *)data;
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unsigned int buff_size = snd_pcm_lib_buffer_bytes(priv->substream);
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unsigned int period_size = snd_pcm_lib_period_bytes(priv->substream);
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unsigned int old_pos = priv->pos;
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unsigned int cur_size = size;
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dev_dbg(rtd->dev, "%s: buff_add :%p, pos = %d, size = %zu\n",
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__func__, &pcm_buff[priv->pos], priv->pos, size);
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if ((priv->pos + size) > buff_size) {
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memcpy(&pcm_buff[priv->pos], src_buff, buff_size - priv->pos);
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cur_size -= buff_size - priv->pos;
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priv->pos = 0;
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}
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memcpy(&pcm_buff[priv->pos], &src_buff[size - cur_size], cur_size);
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priv->pos = (priv->pos + cur_size) % buff_size;
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if (cur_size != size || (old_pos && (old_pos % period_size < size)))
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snd_pcm_period_elapsed(priv->substream);
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return 0;
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}
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static int stm32_adfsdm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct stm32_adfsdm_priv *priv =
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snd_soc_dai_get_drvdata(rtd->cpu_dai);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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priv->pos = 0;
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return stm32_dfsdm_get_buff_cb(priv->iio_ch->indio_dev,
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stm32_afsdm_pcm_cb, priv);
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_STOP:
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return stm32_dfsdm_release_buff_cb(priv->iio_ch->indio_dev);
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}
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return -EINVAL;
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}
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static int stm32_adfsdm_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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int ret;
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ret = snd_soc_set_runtime_hwparams(substream, &stm32_adfsdm_pcm_hw);
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if (!ret)
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priv->substream = substream;
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return ret;
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}
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static int stm32_adfsdm_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct stm32_adfsdm_priv *priv =
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snd_soc_dai_get_drvdata(rtd->cpu_dai);
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snd_pcm_lib_free_pages(substream);
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priv->substream = NULL;
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return 0;
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}
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static snd_pcm_uframes_t stm32_adfsdm_pcm_pointer(
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struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct stm32_adfsdm_priv *priv =
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snd_soc_dai_get_drvdata(rtd->cpu_dai);
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return bytes_to_frames(substream->runtime, priv->pos);
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}
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static int stm32_adfsdm_pcm_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 stm32_adfsdm_priv *priv =
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snd_soc_dai_get_drvdata(rtd->cpu_dai);
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int ret;
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ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
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if (ret < 0)
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return ret;
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priv->pcm_buff = substream->runtime->dma_area;
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return iio_channel_cb_set_buffer_watermark(priv->iio_cb,
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params_period_size(params));
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}
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static int stm32_adfsdm_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_lib_free_pages(substream);
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return 0;
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}
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static struct snd_pcm_ops stm32_adfsdm_pcm_ops = {
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.open = stm32_adfsdm_pcm_open,
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.close = stm32_adfsdm_pcm_close,
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.hw_params = stm32_adfsdm_pcm_hw_params,
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.hw_free = stm32_adfsdm_pcm_hw_free,
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.trigger = stm32_adfsdm_trigger,
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.pointer = stm32_adfsdm_pcm_pointer,
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};
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static int stm32_adfsdm_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_pcm *pcm = rtd->pcm;
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struct stm32_adfsdm_priv *priv =
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snd_soc_dai_get_drvdata(rtd->cpu_dai);
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unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE;
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return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
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priv->dev, size, size);
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}
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static void stm32_adfsdm_pcm_free(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_soc_pcm_runtime *rtd;
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struct stm32_adfsdm_priv *priv;
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substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
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if (substream) {
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rtd = substream->private_data;
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priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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snd_pcm_lib_preallocate_free_for_all(pcm);
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}
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}
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static struct snd_soc_platform_driver stm32_adfsdm_soc_platform = {
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.ops = &stm32_adfsdm_pcm_ops,
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.pcm_new = stm32_adfsdm_pcm_new,
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.pcm_free = stm32_adfsdm_pcm_free,
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};
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static const struct of_device_id stm32_adfsdm_of_match[] = {
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{.compatible = "st,stm32h7-dfsdm-dai"},
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{}
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};
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MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match);
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static int stm32_adfsdm_probe(struct platform_device *pdev)
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{
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struct stm32_adfsdm_priv *priv;
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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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priv->dev = &pdev->dev;
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priv->dai_drv = stm32_adfsdm_dai;
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dev_set_drvdata(&pdev->dev, priv);
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ret = devm_snd_soc_register_component(&pdev->dev,
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&stm32_adfsdm_dai_component,
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&priv->dai_drv, 1);
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if (ret < 0)
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return ret;
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/* Associate iio channel */
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priv->iio_ch = devm_iio_channel_get_all(&pdev->dev);
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if (IS_ERR(priv->iio_ch))
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return PTR_ERR(priv->iio_ch);
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priv->iio_cb = iio_channel_get_all_cb(&pdev->dev, NULL, NULL);
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if (IS_ERR(priv->iio_cb))
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2018-01-11 11:11:51 +00:00
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return PTR_ERR(priv->iio_cb);
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2018-01-10 10:13:15 +00:00
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ret = devm_snd_soc_register_platform(&pdev->dev,
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&stm32_adfsdm_soc_platform);
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if (ret < 0)
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dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
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__func__);
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return ret;
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}
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static struct platform_driver stm32_adfsdm_driver = {
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.driver = {
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.name = STM32_ADFSDM_DRV_NAME,
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.of_match_table = stm32_adfsdm_of_match,
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},
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.probe = stm32_adfsdm_probe,
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};
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module_platform_driver(stm32_adfsdm_driver);
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MODULE_DESCRIPTION("stm32 DFSDM DAI driver");
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MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" STM32_ADFSDM_DRV_NAME);
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