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Linux/sound/soc/stm/stm32_adfsdm.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * This file is part of STM32 DFSDM ASoC DAI driver
  4  *
  5  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
  6  * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
  7  *          Olivier Moysan <olivier.moysan@st.com>
  8  */
  9 
 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>
 15 
 16 #include <linux/iio/iio.h>
 17 #include <linux/iio/consumer.h>
 18 #include <linux/iio/adc/stm32-dfsdm-adc.h>
 19 
 20 #include <sound/pcm.h>
 21 #include <sound/soc.h>
 22 
 23 #define STM32_ADFSDM_DRV_NAME "stm32-adfsdm"
 24 
 25 #define DFSDM_MAX_PERIOD_SIZE   (PAGE_SIZE / 2)
 26 #define DFSDM_MAX_PERIODS       6
 27 
 28 struct stm32_adfsdm_priv {
 29         struct snd_soc_dai_driver dai_drv;
 30         struct snd_pcm_substream *substream;
 31         struct device *dev;
 32 
 33         /* IIO */
 34         struct iio_channel *iio_ch;
 35         struct iio_cb_buffer *iio_cb;
 36         bool iio_active;
 37 
 38         /* PCM buffer */
 39         unsigned char *pcm_buff;
 40         unsigned int pos;
 41 
 42         struct mutex lock; /* protect against race condition on iio state */
 43 };
 44 
 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,
 49 
 50         .rate_min = 8000,
 51         .rate_max = 32000,
 52 
 53         .channels_min = 1,
 54         .channels_max = 1,
 55 
 56         .periods_min = 2,
 57         .periods_max = DFSDM_MAX_PERIODS,
 58 
 59         .period_bytes_max = DFSDM_MAX_PERIOD_SIZE,
 60         .buffer_bytes_max = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE
 61 };
 62 
 63 static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream,
 64                                   struct snd_soc_dai *dai)
 65 {
 66         struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
 67 
 68         mutex_lock(&priv->lock);
 69         if (priv->iio_active) {
 70                 iio_channel_stop_all_cb(priv->iio_cb);
 71                 priv->iio_active = false;
 72         }
 73         mutex_unlock(&priv->lock);
 74 }
 75 
 76 static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
 77                                     struct snd_soc_dai *dai)
 78 {
 79         struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
 80         int ret;
 81 
 82         mutex_lock(&priv->lock);
 83         if (priv->iio_active) {
 84                 iio_channel_stop_all_cb(priv->iio_cb);
 85                 priv->iio_active = false;
 86         }
 87 
 88         ret = iio_write_channel_attribute(priv->iio_ch,
 89                                           substream->runtime->rate, 0,
 90                                           IIO_CHAN_INFO_SAMP_FREQ);
 91         if (ret < 0) {
 92                 dev_err(dai->dev, "%s: Failed to set %d sampling rate\n",
 93                         __func__, substream->runtime->rate);
 94                 goto out;
 95         }
 96 
 97         if (!priv->iio_active) {
 98                 ret = iio_channel_start_all_cb(priv->iio_cb);
 99                 if (!ret)
100                         priv->iio_active = true;
101                 else
102                         dev_err(dai->dev, "%s: IIO channel start failed (%d)\n",
103                                 __func__, ret);
104         }
105 
106 out:
107         mutex_unlock(&priv->lock);
108 
109         return ret;
110 }
111 
112 static int stm32_adfsdm_set_sysclk(struct snd_soc_dai *dai, int clk_id,
113                                    unsigned int freq, int dir)
114 {
115         struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
116         ssize_t size;
117         char str_freq[10];
118 
119         dev_dbg(dai->dev, "%s: Enter for freq %d\n", __func__, freq);
120 
121         /* Set IIO frequency if CODEC is master as clock comes from SPI_IN */
122 
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",
128                         __func__);
129                 return -EINVAL;
130         }
131         return 0;
132 }
133 
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,
138 };
139 
140 static const struct snd_soc_dai_driver stm32_adfsdm_dai = {
141         .capture = {
142                     .channels_min = 1,
143                     .channels_max = 1,
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),
148                     },
149         .ops = &stm32_adfsdm_dai_ops,
150 };
151 
152 static const struct snd_soc_component_driver stm32_adfsdm_dai_component = {
153         .name = "stm32_dfsdm_audio",
154 };
155 
156 static void memcpy_32to16(void *dest, const void *src, size_t n)
157 {
158         unsigned int i = 0;
159         u16 *d = (u16 *)dest, *s = (u16 *)src;
160 
161         s++;
162         for (i = n; i > 0; i--) {
163                 *d++ = *s++;
164                 s++;
165         }
166 }
167 
168 static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)
169 {
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;
179 
180         if (format == SNDRV_PCM_FORMAT_S16_LE)
181                 src_size >>= 1;
182         cur_size = src_size;
183 
184         dev_dbg(rtd->dev, "%s: buff_add :%pK, pos = %d, size = %zu\n",
185                 __func__, &pcm_buff[priv->pos], priv->pos, src_size);
186 
187         if ((priv->pos + src_size) > buff_size) {
188                 if (format == SNDRV_PCM_FORMAT_S16_LE)
189                         memcpy_32to16(&pcm_buff[priv->pos], src_buff,
190                                       buff_size - priv->pos);
191                 else
192                         memcpy(&pcm_buff[priv->pos], src_buff,
193                                buff_size - priv->pos);
194                 cur_size -= buff_size - priv->pos;
195                 priv->pos = 0;
196         }
197 
198         if (format == SNDRV_PCM_FORMAT_S16_LE)
199                 memcpy_32to16(&pcm_buff[priv->pos],
200                               &src_buff[src_size - cur_size], cur_size);
201         else
202                 memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size],
203                        cur_size);
204 
205         priv->pos = (priv->pos + cur_size) % buff_size;
206 
207         if (cur_size != src_size || (old_pos && (old_pos % period_size < size)))
208                 snd_pcm_period_elapsed(priv->substream);
209 
210         return 0;
211 }
212 
213 static int stm32_adfsdm_trigger(struct snd_pcm_substream *substream, int cmd)
214 {
215         struct snd_soc_pcm_runtime *rtd = substream->private_data;
216         struct stm32_adfsdm_priv *priv =
217                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
218 
219         switch (cmd) {
220         case SNDRV_PCM_TRIGGER_START:
221         case SNDRV_PCM_TRIGGER_RESUME:
222                 priv->pos = 0;
223                 return stm32_dfsdm_get_buff_cb(priv->iio_ch->indio_dev,
224                                                stm32_afsdm_pcm_cb, priv);
225         case SNDRV_PCM_TRIGGER_SUSPEND:
226         case SNDRV_PCM_TRIGGER_STOP:
227                 return stm32_dfsdm_release_buff_cb(priv->iio_ch->indio_dev);
228         }
229 
230         return -EINVAL;
231 }
232 
233 static int stm32_adfsdm_pcm_open(struct snd_pcm_substream *substream)
234 {
235         struct snd_soc_pcm_runtime *rtd = substream->private_data;
236         struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
237         int ret;
238 
239         ret =  snd_soc_set_runtime_hwparams(substream, &stm32_adfsdm_pcm_hw);
240         if (!ret)
241                 priv->substream = substream;
242 
243         return ret;
244 }
245 
246 static int stm32_adfsdm_pcm_close(struct snd_pcm_substream *substream)
247 {
248         struct snd_soc_pcm_runtime *rtd = substream->private_data;
249         struct stm32_adfsdm_priv *priv =
250                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
251 
252         snd_pcm_lib_free_pages(substream);
253         priv->substream = NULL;
254 
255         return 0;
256 }
257 
258 static snd_pcm_uframes_t stm32_adfsdm_pcm_pointer(
259                                             struct snd_pcm_substream *substream)
260 {
261         struct snd_soc_pcm_runtime *rtd = substream->private_data;
262         struct stm32_adfsdm_priv *priv =
263                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
264 
265         return bytes_to_frames(substream->runtime, priv->pos);
266 }
267 
268 static int stm32_adfsdm_pcm_hw_params(struct snd_pcm_substream *substream,
269                                       struct snd_pcm_hw_params *params)
270 {
271         struct snd_soc_pcm_runtime *rtd = substream->private_data;
272         struct stm32_adfsdm_priv *priv =
273                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
274         int ret;
275 
276         ret =  snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
277         if (ret < 0)
278                 return ret;
279         priv->pcm_buff = substream->runtime->dma_area;
280 
281         return iio_channel_cb_set_buffer_watermark(priv->iio_cb,
282                                                    params_period_size(params));
283 }
284 
285 static int stm32_adfsdm_pcm_hw_free(struct snd_pcm_substream *substream)
286 {
287         snd_pcm_lib_free_pages(substream);
288 
289         return 0;
290 }
291 
292 static struct snd_pcm_ops stm32_adfsdm_pcm_ops = {
293         .open           = stm32_adfsdm_pcm_open,
294         .close          = stm32_adfsdm_pcm_close,
295         .hw_params      = stm32_adfsdm_pcm_hw_params,
296         .hw_free        = stm32_adfsdm_pcm_hw_free,
297         .trigger        = stm32_adfsdm_trigger,
298         .pointer        = stm32_adfsdm_pcm_pointer,
299 };
300 
301 static int stm32_adfsdm_pcm_new(struct snd_soc_pcm_runtime *rtd)
302 {
303         struct snd_pcm *pcm = rtd->pcm;
304         struct stm32_adfsdm_priv *priv =
305                 snd_soc_dai_get_drvdata(rtd->cpu_dai);
306         unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE;
307 
308         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
309                                               priv->dev, size, size);
310         return 0;
311 }
312 
313 static void stm32_adfsdm_pcm_free(struct snd_pcm *pcm)
314 {
315         struct snd_pcm_substream *substream;
316 
317         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
318         if (substream)
319                 snd_pcm_lib_preallocate_free_for_all(pcm);
320 }
321 
322 static struct snd_soc_component_driver stm32_adfsdm_soc_platform = {
323         .ops            = &stm32_adfsdm_pcm_ops,
324         .pcm_new        = stm32_adfsdm_pcm_new,
325         .pcm_free       = stm32_adfsdm_pcm_free,
326 };
327 
328 static const struct of_device_id stm32_adfsdm_of_match[] = {
329         {.compatible = "st,stm32h7-dfsdm-dai"},
330         {}
331 };
332 MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match);
333 
334 static int stm32_adfsdm_probe(struct platform_device *pdev)
335 {
336         struct stm32_adfsdm_priv *priv;
337         struct snd_soc_component *component;
338         int ret;
339 
340         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
341         if (!priv)
342                 return -ENOMEM;
343 
344         priv->dev = &pdev->dev;
345         priv->dai_drv = stm32_adfsdm_dai;
346         mutex_init(&priv->lock);
347 
348         dev_set_drvdata(&pdev->dev, priv);
349 
350         ret = devm_snd_soc_register_component(&pdev->dev,
351                                               &stm32_adfsdm_dai_component,
352                                               &priv->dai_drv, 1);
353         if (ret < 0)
354                 return ret;
355 
356         /* Associate iio channel */
357         priv->iio_ch  = devm_iio_channel_get_all(&pdev->dev);
358         if (IS_ERR(priv->iio_ch))
359                 return PTR_ERR(priv->iio_ch);
360 
361         priv->iio_cb = iio_channel_get_all_cb(&pdev->dev, NULL, NULL);
362         if (IS_ERR(priv->iio_cb))
363                 return PTR_ERR(priv->iio_cb);
364 
365         component = devm_kzalloc(&pdev->dev, sizeof(*component), GFP_KERNEL);
366         if (!component)
367                 return -ENOMEM;
368 #ifdef CONFIG_DEBUG_FS
369         component->debugfs_prefix = "pcm";
370 #endif
371 
372         ret = snd_soc_add_component(&pdev->dev, component,
373                                     &stm32_adfsdm_soc_platform, NULL, 0);
374         if (ret < 0)
375                 dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
376                         __func__);
377 
378         return ret;
379 }
380 
381 static int stm32_adfsdm_remove(struct platform_device *pdev)
382 {
383         snd_soc_unregister_component(&pdev->dev);
384 
385         return 0;
386 }
387 
388 static struct platform_driver stm32_adfsdm_driver = {
389         .driver = {
390                    .name = STM32_ADFSDM_DRV_NAME,
391                    .of_match_table = stm32_adfsdm_of_match,
392                    },
393         .probe = stm32_adfsdm_probe,
394         .remove = stm32_adfsdm_remove,
395 };
396 
397 module_platform_driver(stm32_adfsdm_driver);
398 
399 MODULE_DESCRIPTION("stm32 DFSDM DAI driver");
400 MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
401 MODULE_LICENSE("GPL v2");
402 MODULE_ALIAS("platform:" STM32_ADFSDM_DRV_NAME);
403 

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