2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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#include <linux/mutex.h>
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2018-01-10 13:13:15 +03:00
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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2021-11-19 13:47:51 +03:00
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#include <linux/pm_runtime.h>
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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struct mutex lock; /* protect against race condition on iio state */
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:45 +03:00
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SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_PAUSE,
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2019-06-19 14:40:02 +03:00
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.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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mutex_lock(&priv->lock);
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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mutex_unlock(&priv->lock);
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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mutex_lock(&priv->lock);
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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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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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goto out;
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2018-01-10 13:13:15 +03:00
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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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2019-03-04 17:52:43 +03:00
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out:
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mutex_unlock(&priv->lock);
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2018-01-10 13:13:15 +03:00
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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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2021-03-27 00:59:20 +03:00
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snprintf(str_freq, sizeof(str_freq), "%u\n", freq);
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2018-01-10 13:13:15 +03:00
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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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2019-06-19 14:40:02 +03:00
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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2020-10-07 18:34:58 +03:00
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.rates = SNDRV_PCM_RATE_CONTINUOUS,
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.rate_min = 8000,
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.rate_max = 48000,
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2018-01-10 13:13:15 +03:00
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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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2022-06-23 15:51:22 +03:00
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.legacy_dai_naming = 1,
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2018-01-10 13:13:15 +03:00
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};
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2020-01-10 16:11:31 +03:00
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static void stm32_memcpy_32to16(void *dest, const void *src, size_t n)
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2019-06-19 14:40:02 +03:00
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{
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unsigned int i = 0;
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u16 *d = (u16 *)dest, *s = (u16 *)src;
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s++;
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2020-01-10 16:11:31 +03:00
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for (i = n >> 1; i > 0; i--) {
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2019-06-19 14:40:02 +03:00
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*d++ = *s++;
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s++;
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}
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}
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2018-01-10 13:13:15 +03:00
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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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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(priv->substream);
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2018-01-10 13:13:15 +03:00
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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 old_pos = priv->pos;
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2019-06-19 14:40:02 +03:00
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size_t buff_size = snd_pcm_lib_buffer_bytes(priv->substream);
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size_t period_size = snd_pcm_lib_period_bytes(priv->substream);
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size_t cur_size, src_size = size;
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snd_pcm_format_t format = priv->substream->runtime->format;
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if (format == SNDRV_PCM_FORMAT_S16_LE)
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src_size >>= 1;
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cur_size = src_size;
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2018-01-10 13:13:15 +03:00
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2018-07-06 16:07:03 +03:00
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dev_dbg(rtd->dev, "%s: buff_add :%pK, pos = %d, size = %zu\n",
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2019-06-19 14:40:02 +03:00
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__func__, &pcm_buff[priv->pos], priv->pos, src_size);
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2018-01-10 13:13:15 +03:00
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2019-06-19 14:40:02 +03:00
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if ((priv->pos + src_size) > buff_size) {
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if (format == SNDRV_PCM_FORMAT_S16_LE)
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2020-01-10 16:11:31 +03:00
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stm32_memcpy_32to16(&pcm_buff[priv->pos], src_buff,
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buff_size - priv->pos);
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2019-06-19 14:40:02 +03:00
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else
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memcpy(&pcm_buff[priv->pos], src_buff,
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buff_size - priv->pos);
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2018-01-10 13:13:15 +03:00
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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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2019-06-19 14:40:02 +03:00
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if (format == SNDRV_PCM_FORMAT_S16_LE)
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2020-01-10 16:11:31 +03:00
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stm32_memcpy_32to16(&pcm_buff[priv->pos],
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&src_buff[src_size - cur_size], cur_size);
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2019-06-19 14:40:02 +03:00
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else
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memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size],
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cur_size);
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2018-01-10 13:13:15 +03:00
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priv->pos = (priv->pos + cur_size) % buff_size;
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2019-06-19 14:40:02 +03:00
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if (cur_size != src_size || (old_pos && (old_pos % period_size < size)))
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2018-01-10 13:13:15 +03:00
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snd_pcm_period_elapsed(priv->substream);
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return 0;
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}
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2019-10-02 08:32:46 +03:00
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static int stm32_adfsdm_trigger(struct snd_soc_component *component,
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struct snd_pcm_substream *substream, int cmd)
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2018-01-10 13:13:15 +03:00
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{
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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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2018-01-10 13:13:15 +03:00
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struct stm32_adfsdm_priv *priv =
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2020-03-23 08:20:52 +03:00
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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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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2019-10-02 08:32:46 +03:00
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static int stm32_adfsdm_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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2018-01-10 13:13:15 +03:00
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{
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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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2020-03-23 08:20:52 +03:00
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struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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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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2019-10-02 08:32:46 +03:00
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static int stm32_adfsdm_pcm_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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2018-01-10 13:13:15 +03:00
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{
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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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2018-01-10 13:13:15 +03:00
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struct stm32_adfsdm_priv *priv =
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2020-03-23 08:20:52 +03:00
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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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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2019-10-02 08:32:46 +03:00
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struct snd_soc_component *component,
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2018-01-10 13:13:15 +03:00
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struct snd_pcm_substream *substream)
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{
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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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2018-01-10 13:13:15 +03:00
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struct stm32_adfsdm_priv *priv =
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2020-03-23 08:20:52 +03:00
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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return bytes_to_frames(substream->runtime, priv->pos);
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}
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2019-10-02 08:32:46 +03:00
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static int stm32_adfsdm_pcm_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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2018-01-10 13:13:15 +03:00
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struct snd_pcm_hw_params *params)
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{
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2020-07-20 04:18:01 +03:00
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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2018-01-10 13:13:15 +03:00
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struct stm32_adfsdm_priv *priv =
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2020-03-23 08:20:52 +03:00
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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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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2019-10-02 08:32:46 +03:00
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static int stm32_adfsdm_pcm_new(struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd)
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2018-01-10 13:13:15 +03:00
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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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2020-03-23 08:20:52 +03:00
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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2018-01-10 13:13:15 +03:00
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unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE;
|
|
|
|
|
2019-12-10 17:26:03 +03:00
|
|
|
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
|
|
|
|
priv->dev, size, size);
|
2019-02-04 18:40:22 +03:00
|
|
|
return 0;
|
2018-01-10 13:13:15 +03:00
|
|
|
}
|
|
|
|
|
2020-11-21 19:14:56 +03:00
|
|
|
static int stm32_adfsdm_dummy_cb(const void *data, void *private)
|
|
|
|
{
|
|
|
|
/*
|
2022-05-21 14:11:26 +03:00
|
|
|
* This dummy callback is requested by iio_channel_get_all_cb() API,
|
2020-11-21 19:14:56 +03:00
|
|
|
* but the stm32_dfsdm_get_buff_cb() API is used instead, to optimize
|
|
|
|
* DMA transfers.
|
|
|
|
*/
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2022-11-09 20:08:49 +03:00
|
|
|
static void stm32_adfsdm_cleanup(void *data)
|
|
|
|
{
|
|
|
|
iio_channel_release_all_cb(data);
|
|
|
|
}
|
|
|
|
|
2018-01-29 05:51:58 +03:00
|
|
|
static struct snd_soc_component_driver stm32_adfsdm_soc_platform = {
|
2019-10-02 08:32:46 +03:00
|
|
|
.open = stm32_adfsdm_pcm_open,
|
|
|
|
.close = stm32_adfsdm_pcm_close,
|
|
|
|
.hw_params = stm32_adfsdm_pcm_hw_params,
|
|
|
|
.trigger = stm32_adfsdm_trigger,
|
|
|
|
.pointer = stm32_adfsdm_pcm_pointer,
|
|
|
|
.pcm_construct = stm32_adfsdm_pcm_new,
|
2018-01-10 13:13:15 +03:00
|
|
|
};
|
|
|
|
|
|
|
|
static const struct of_device_id stm32_adfsdm_of_match[] = {
|
|
|
|
{.compatible = "st,stm32h7-dfsdm-dai"},
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match);
|
|
|
|
|
|
|
|
static int stm32_adfsdm_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct stm32_adfsdm_priv *priv;
|
2019-03-04 17:52:44 +03:00
|
|
|
struct snd_soc_component *component;
|
2018-01-10 13:13:15 +03:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
|
|
if (!priv)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
priv->dev = &pdev->dev;
|
|
|
|
priv->dai_drv = stm32_adfsdm_dai;
|
2019-03-04 17:52:43 +03:00
|
|
|
mutex_init(&priv->lock);
|
2018-01-10 13:13:15 +03:00
|
|
|
|
|
|
|
dev_set_drvdata(&pdev->dev, priv);
|
|
|
|
|
|
|
|
ret = devm_snd_soc_register_component(&pdev->dev,
|
|
|
|
&stm32_adfsdm_dai_component,
|
|
|
|
&priv->dai_drv, 1);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* Associate iio channel */
|
|
|
|
priv->iio_ch = devm_iio_channel_get_all(&pdev->dev);
|
|
|
|
if (IS_ERR(priv->iio_ch))
|
|
|
|
return PTR_ERR(priv->iio_ch);
|
|
|
|
|
2020-11-21 19:14:56 +03:00
|
|
|
priv->iio_cb = iio_channel_get_all_cb(&pdev->dev, &stm32_adfsdm_dummy_cb, NULL);
|
2018-01-10 13:13:15 +03:00
|
|
|
if (IS_ERR(priv->iio_cb))
|
2018-01-11 14:11:51 +03:00
|
|
|
return PTR_ERR(priv->iio_cb);
|
2018-01-10 13:13:15 +03:00
|
|
|
|
2022-11-09 20:08:49 +03:00
|
|
|
ret = devm_add_action_or_reset(&pdev->dev, stm32_adfsdm_cleanup, priv->iio_cb);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&pdev->dev, "Unable to add action\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2019-03-04 17:52:44 +03:00
|
|
|
component = devm_kzalloc(&pdev->dev, sizeof(*component), GFP_KERNEL);
|
|
|
|
if (!component)
|
|
|
|
return -ENOMEM;
|
2020-07-31 17:41:46 +03:00
|
|
|
|
|
|
|
ret = snd_soc_component_initialize(component,
|
|
|
|
&stm32_adfsdm_soc_platform,
|
|
|
|
&pdev->dev);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2019-03-04 17:52:44 +03:00
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
component->debugfs_prefix = "pcm";
|
|
|
|
#endif
|
|
|
|
|
2020-07-31 17:41:46 +03:00
|
|
|
ret = snd_soc_add_component(component, NULL, 0);
|
2022-09-27 17:26:00 +03:00
|
|
|
if (ret < 0) {
|
2018-01-10 13:13:15 +03:00
|
|
|
dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
|
|
|
|
__func__);
|
2022-09-27 17:26:00 +03:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
2018-01-10 13:13:15 +03:00
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2023-03-15 18:07:08 +03:00
|
|
|
static void stm32_adfsdm_remove(struct platform_device *pdev)
|
2019-03-04 17:52:44 +03:00
|
|
|
{
|
|
|
|
snd_soc_unregister_component(&pdev->dev);
|
2021-11-19 13:47:51 +03:00
|
|
|
pm_runtime_disable(&pdev->dev);
|
2019-03-04 17:52:44 +03:00
|
|
|
}
|
|
|
|
|
2018-01-10 13:13:15 +03:00
|
|
|
static struct platform_driver stm32_adfsdm_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = STM32_ADFSDM_DRV_NAME,
|
|
|
|
.of_match_table = stm32_adfsdm_of_match,
|
|
|
|
},
|
|
|
|
.probe = stm32_adfsdm_probe,
|
2023-03-15 18:07:08 +03:00
|
|
|
.remove_new = stm32_adfsdm_remove,
|
2018-01-10 13:13:15 +03:00
|
|
|
};
|
|
|
|
|
|
|
|
module_platform_driver(stm32_adfsdm_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("stm32 DFSDM DAI driver");
|
|
|
|
MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_ALIAS("platform:" STM32_ADFSDM_DRV_NAME);
|