1 // SPDX-License-Identifier: GPL-2.0
3 * This file is part of STM32 DFSDM ASoC DAI driver
5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
6 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
7 * Olivier Moysan <olivier.moysan@st.com>
10 #include <linux/clk.h>
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
16 #include <linux/iio/iio.h>
17 #include <linux/iio/consumer.h>
18 #include <linux/iio/adc/stm32-dfsdm-adc.h>
20 #include <sound/pcm.h>
21 #include <sound/soc.h>
23 #define STM32_ADFSDM_DRV_NAME "stm32-adfsdm"
25 #define DFSDM_MAX_PERIOD_SIZE (PAGE_SIZE / 2)
26 #define DFSDM_MAX_PERIODS 6
28 struct stm32_adfsdm_priv {
29 struct snd_soc_dai_driver dai_drv;
30 struct snd_pcm_substream *substream;
34 struct iio_channel *iio_ch;
35 struct iio_cb_buffer *iio_cb;
39 unsigned char *pcm_buff;
42 struct mutex lock; /* protect against race condition on iio state */
45 static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = {
46 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
47 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_PAUSE,
48 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
57 .periods_max = DFSDM_MAX_PERIODS,
59 .period_bytes_max = DFSDM_MAX_PERIOD_SIZE,
60 .buffer_bytes_max = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE
63 static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream,
64 struct snd_soc_dai *dai)
66 struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
68 mutex_lock(&priv->lock);
69 if (priv->iio_active) {
70 iio_channel_stop_all_cb(priv->iio_cb);
71 priv->iio_active = false;
73 mutex_unlock(&priv->lock);
76 static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
77 struct snd_soc_dai *dai)
79 struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
82 mutex_lock(&priv->lock);
83 if (priv->iio_active) {
84 iio_channel_stop_all_cb(priv->iio_cb);
85 priv->iio_active = false;
88 ret = iio_write_channel_attribute(priv->iio_ch,
89 substream->runtime->rate, 0,
90 IIO_CHAN_INFO_SAMP_FREQ);
92 dev_err(dai->dev, "%s: Failed to set %d sampling rate\n",
93 __func__, substream->runtime->rate);
97 if (!priv->iio_active) {
98 ret = iio_channel_start_all_cb(priv->iio_cb);
100 priv->iio_active = true;
102 dev_err(dai->dev, "%s: IIO channel start failed (%d)\n",
107 mutex_unlock(&priv->lock);
112 static int stm32_adfsdm_set_sysclk(struct snd_soc_dai *dai, int clk_id,
113 unsigned int freq, int dir)
115 struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
119 dev_dbg(dai->dev, "%s: Enter for freq %d\n", __func__, freq);
121 /* Set IIO frequency if CODEC is master as clock comes from SPI_IN */
123 snprintf(str_freq, sizeof(str_freq), "%d\n", freq);
124 size = iio_write_channel_ext_info(priv->iio_ch, "spi_clk_freq",
125 str_freq, sizeof(str_freq));
126 if (size != sizeof(str_freq)) {
127 dev_err(dai->dev, "%s: Failed to set SPI clock\n",
134 static const struct snd_soc_dai_ops stm32_adfsdm_dai_ops = {
135 .shutdown = stm32_adfsdm_shutdown,
136 .prepare = stm32_adfsdm_dai_prepare,
137 .set_sysclk = stm32_adfsdm_set_sysclk,
140 static const struct snd_soc_dai_driver stm32_adfsdm_dai = {
144 .formats = SNDRV_PCM_FMTBIT_S16_LE |
145 SNDRV_PCM_FMTBIT_S32_LE,
146 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
147 SNDRV_PCM_RATE_32000),
149 .ops = &stm32_adfsdm_dai_ops,
152 static const struct snd_soc_component_driver stm32_adfsdm_dai_component = {
153 .name = "stm32_dfsdm_audio",
156 static void stm32_memcpy_32to16(void *dest, const void *src, size_t n)
159 u16 *d = (u16 *)dest, *s = (u16 *)src;
162 for (i = n >> 1; i > 0; i--) {
168 static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)
170 struct stm32_adfsdm_priv *priv = private;
171 struct snd_soc_pcm_runtime *rtd = priv->substream->private_data;
172 u8 *pcm_buff = priv->pcm_buff;
173 u8 *src_buff = (u8 *)data;
174 unsigned int old_pos = priv->pos;
175 size_t buff_size = snd_pcm_lib_buffer_bytes(priv->substream);
176 size_t period_size = snd_pcm_lib_period_bytes(priv->substream);
177 size_t cur_size, src_size = size;
178 snd_pcm_format_t format = priv->substream->runtime->format;
180 if (format == SNDRV_PCM_FORMAT_S16_LE)
184 dev_dbg(rtd->dev, "%s: buff_add :%pK, pos = %d, size = %zu\n",
185 __func__, &pcm_buff[priv->pos], priv->pos, src_size);
187 if ((priv->pos + src_size) > buff_size) {
188 if (format == SNDRV_PCM_FORMAT_S16_LE)
189 stm32_memcpy_32to16(&pcm_buff[priv->pos], src_buff,
190 buff_size - priv->pos);
192 memcpy(&pcm_buff[priv->pos], src_buff,
193 buff_size - priv->pos);
194 cur_size -= buff_size - priv->pos;
198 if (format == SNDRV_PCM_FORMAT_S16_LE)
199 stm32_memcpy_32to16(&pcm_buff[priv->pos],
200 &src_buff[src_size - cur_size], cur_size);
202 memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size],
205 priv->pos = (priv->pos + cur_size) % buff_size;
207 if (cur_size != src_size || (old_pos && (old_pos % period_size < size)))
208 snd_pcm_period_elapsed(priv->substream);
213 static int stm32_adfsdm_trigger(struct snd_soc_component *component,
214 struct snd_pcm_substream *substream, int cmd)
216 struct snd_soc_pcm_runtime *rtd = substream->private_data;
217 struct stm32_adfsdm_priv *priv =
218 snd_soc_dai_get_drvdata(rtd->cpu_dai);
221 case SNDRV_PCM_TRIGGER_START:
222 case SNDRV_PCM_TRIGGER_RESUME:
224 return stm32_dfsdm_get_buff_cb(priv->iio_ch->indio_dev,
225 stm32_afsdm_pcm_cb, priv);
226 case SNDRV_PCM_TRIGGER_SUSPEND:
227 case SNDRV_PCM_TRIGGER_STOP:
228 return stm32_dfsdm_release_buff_cb(priv->iio_ch->indio_dev);
234 static int stm32_adfsdm_pcm_open(struct snd_soc_component *component,
235 struct snd_pcm_substream *substream)
237 struct snd_soc_pcm_runtime *rtd = substream->private_data;
238 struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
241 ret = snd_soc_set_runtime_hwparams(substream, &stm32_adfsdm_pcm_hw);
243 priv->substream = substream;
248 static int stm32_adfsdm_pcm_close(struct snd_soc_component *component,
249 struct snd_pcm_substream *substream)
251 struct snd_soc_pcm_runtime *rtd = substream->private_data;
252 struct stm32_adfsdm_priv *priv =
253 snd_soc_dai_get_drvdata(rtd->cpu_dai);
255 priv->substream = NULL;
260 static snd_pcm_uframes_t stm32_adfsdm_pcm_pointer(
261 struct snd_soc_component *component,
262 struct snd_pcm_substream *substream)
264 struct snd_soc_pcm_runtime *rtd = substream->private_data;
265 struct stm32_adfsdm_priv *priv =
266 snd_soc_dai_get_drvdata(rtd->cpu_dai);
268 return bytes_to_frames(substream->runtime, priv->pos);
271 static int stm32_adfsdm_pcm_hw_params(struct snd_soc_component *component,
272 struct snd_pcm_substream *substream,
273 struct snd_pcm_hw_params *params)
275 struct snd_soc_pcm_runtime *rtd = substream->private_data;
276 struct stm32_adfsdm_priv *priv =
277 snd_soc_dai_get_drvdata(rtd->cpu_dai);
279 priv->pcm_buff = substream->runtime->dma_area;
281 return iio_channel_cb_set_buffer_watermark(priv->iio_cb,
282 params_period_size(params));
285 static int stm32_adfsdm_pcm_new(struct snd_soc_component *component,
286 struct snd_soc_pcm_runtime *rtd)
288 struct snd_pcm *pcm = rtd->pcm;
289 struct stm32_adfsdm_priv *priv =
290 snd_soc_dai_get_drvdata(rtd->cpu_dai);
291 unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE;
293 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
294 priv->dev, size, size);
298 static struct snd_soc_component_driver stm32_adfsdm_soc_platform = {
299 .open = stm32_adfsdm_pcm_open,
300 .close = stm32_adfsdm_pcm_close,
301 .hw_params = stm32_adfsdm_pcm_hw_params,
302 .trigger = stm32_adfsdm_trigger,
303 .pointer = stm32_adfsdm_pcm_pointer,
304 .pcm_construct = stm32_adfsdm_pcm_new,
307 static const struct of_device_id stm32_adfsdm_of_match[] = {
308 {.compatible = "st,stm32h7-dfsdm-dai"},
311 MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match);
313 static int stm32_adfsdm_probe(struct platform_device *pdev)
315 struct stm32_adfsdm_priv *priv;
316 struct snd_soc_component *component;
319 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
323 priv->dev = &pdev->dev;
324 priv->dai_drv = stm32_adfsdm_dai;
325 mutex_init(&priv->lock);
327 dev_set_drvdata(&pdev->dev, priv);
329 ret = devm_snd_soc_register_component(&pdev->dev,
330 &stm32_adfsdm_dai_component,
335 /* Associate iio channel */
336 priv->iio_ch = devm_iio_channel_get_all(&pdev->dev);
337 if (IS_ERR(priv->iio_ch))
338 return PTR_ERR(priv->iio_ch);
340 priv->iio_cb = iio_channel_get_all_cb(&pdev->dev, NULL, NULL);
341 if (IS_ERR(priv->iio_cb))
342 return PTR_ERR(priv->iio_cb);
344 component = devm_kzalloc(&pdev->dev, sizeof(*component), GFP_KERNEL);
347 #ifdef CONFIG_DEBUG_FS
348 component->debugfs_prefix = "pcm";
351 ret = snd_soc_add_component(&pdev->dev, component,
352 &stm32_adfsdm_soc_platform, NULL, 0);
354 dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
360 static int stm32_adfsdm_remove(struct platform_device *pdev)
362 snd_soc_unregister_component(&pdev->dev);
367 static struct platform_driver stm32_adfsdm_driver = {
369 .name = STM32_ADFSDM_DRV_NAME,
370 .of_match_table = stm32_adfsdm_of_match,
372 .probe = stm32_adfsdm_probe,
373 .remove = stm32_adfsdm_remove,
376 module_platform_driver(stm32_adfsdm_driver);
378 MODULE_DESCRIPTION("stm32 DFSDM DAI driver");
379 MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
380 MODULE_LICENSE("GPL v2");
381 MODULE_ALIAS("platform:" STM32_ADFSDM_DRV_NAME);