ASoC: stm32: dfsdm: add 16 bits audio record support

Add support of audio 16 bits format record to STM32
DFSDM driver.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c
index cc517e0..3c9a9de 100644 (file)
--- a/sound/soc/stm/stm32_adfsdm.c
+++ b/sound/soc/stm/stm32_adfsdm.c
@@ -45,7 +45,7 @@ struct stm32_adfsdm_priv {
 static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = {
        .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
                SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_PAUSE,
-       .formats = SNDRV_PCM_FMTBIT_S32_LE,
+       .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
 
        .rate_min = 8000,
        .rate_max = 32000,
@@ -141,7 +141,8 @@ static const struct snd_soc_dai_driver stm32_adfsdm_dai = {
        .capture = {
                    .channels_min = 1,
                    .channels_max = 1,
-                   .formats = SNDRV_PCM_FMTBIT_S32_LE,
+                   .formats = SNDRV_PCM_FMTBIT_S16_LE |
+                              SNDRV_PCM_FMTBIT_S32_LE,
                    .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
                              SNDRV_PCM_RATE_32000),
                    },
@@ -152,30 +153,58 @@ static const struct snd_soc_component_driver stm32_adfsdm_dai_component = {
        .name = "stm32_dfsdm_audio",
 };
 
+static void memcpy_32to16(void *dest, const void *src, size_t n)
+{
+       unsigned int i = 0;
+       u16 *d = (u16 *)dest, *s = (u16 *)src;
+
+       s++;
+       for (i = n; i > 0; i--) {
+               *d++ = *s++;
+               s++;
+       }
+}
+
 static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private)
 {
        struct stm32_adfsdm_priv *priv = private;
        struct snd_soc_pcm_runtime *rtd = priv->substream->private_data;
        u8 *pcm_buff = priv->pcm_buff;
        u8 *src_buff = (u8 *)data;
-       unsigned int buff_size = snd_pcm_lib_buffer_bytes(priv->substream);
-       unsigned int period_size = snd_pcm_lib_period_bytes(priv->substream);
        unsigned int old_pos = priv->pos;
-       unsigned int cur_size = size;
+       size_t buff_size = snd_pcm_lib_buffer_bytes(priv->substream);
+       size_t period_size = snd_pcm_lib_period_bytes(priv->substream);
+       size_t cur_size, src_size = size;
+       snd_pcm_format_t format = priv->substream->runtime->format;
+
+       if (format == SNDRV_PCM_FORMAT_S16_LE)
+               src_size >>= 1;
+       cur_size = src_size;
 
        dev_dbg(rtd->dev, "%s: buff_add :%pK, pos = %d, size = %zu\n",
-               __func__, &pcm_buff[priv->pos], priv->pos, size);
+               __func__, &pcm_buff[priv->pos], priv->pos, src_size);
 
-       if ((priv->pos + size) > buff_size) {
-               memcpy(&pcm_buff[priv->pos], src_buff, buff_size - priv->pos);
+       if ((priv->pos + src_size) > buff_size) {
+               if (format == SNDRV_PCM_FORMAT_S16_LE)
+                       memcpy_32to16(&pcm_buff[priv->pos], src_buff,
+                                     buff_size - priv->pos);
+               else
+                       memcpy(&pcm_buff[priv->pos], src_buff,
+                              buff_size - priv->pos);
                cur_size -= buff_size - priv->pos;
                priv->pos = 0;
        }
 
-       memcpy(&pcm_buff[priv->pos], &src_buff[size - cur_size], cur_size);
+       if (format == SNDRV_PCM_FORMAT_S16_LE)
+               memcpy_32to16(&pcm_buff[priv->pos],
+                             &src_buff[src_size - cur_size], cur_size);
+       else
+               memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size],
+                      cur_size);
+
        priv->pos = (priv->pos + cur_size) % buff_size;
 
-       if (cur_size != size || (old_pos && (old_pos % period_size < size)))
+       if (cur_size != src_size || (old_pos && (old_pos % period_size < size)))
                snd_pcm_period_elapsed(priv->substream);
 
        return 0;