ASoC: stm32: sai: add iec958 controls support

Add support of iec958 controls for STM32 SAI.

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

diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig
index 48f9ddd..9b26813 100644 (file)
--- a/sound/soc/stm/Kconfig
+++ b/sound/soc/stm/Kconfig
@@ -6,6 +6,7 @@ config SND_SOC_STM32_SAI
        depends on SND_SOC
        select SND_SOC_GENERIC_DMAENGINE_PCM
        select REGMAP_MMIO
+       select SND_PCM_IEC958
        help
          Say Y if you want to enable SAI for STM32
 

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index cfeb219..c4f15ea 100644 (file)
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -96,7 +96,8 @@
  * @slot_mask: rx or tx active slots mask. set at init or at runtime
  * @data_size: PCM data width. corresponds to PCM substream width.
  * @spdif_frm_cnt: S/PDIF playback frame counter
- * @spdif_status_bits: S/PDIF status bits
+ * @snd_aes_iec958: iec958 data
+ * @ctrl_lock: control lock
  */
 struct stm32_sai_sub_data {
        struct platform_device *pdev;
@@ -125,7 +126,8 @@ struct stm32_sai_sub_data {
        int slot_mask;
        int data_size;
        unsigned int spdif_frm_cnt;
-       unsigned char spdif_status_bits[SAI_IEC60958_STATUS_BYTES];
+       struct snd_aes_iec958 iec958;
+       struct mutex ctrl_lock; /* protect resources accessed by controls */
 };
 
 enum stm32_sai_fifo_th {
@@ -184,10 +186,6 @@ static bool stm32_sai_sub_writeable_reg(struct device *dev, unsigned int reg)
        }
 }
 
-static const unsigned char default_status_bits[SAI_IEC60958_STATUS_BYTES] = {
-       0, 0, 0, IEC958_AES3_CON_FS_48000,
-};
-
 static const struct regmap_config stm32_sai_sub_regmap_config_f4 = {
        .reg_bits = 32,
        .reg_stride = 4,
@@ -210,6 +208,49 @@ static const struct regmap_config stm32_sai_sub_regmap_config_h7 = {
        .fast_io = true,
 };
 
+static int snd_pcm_iec958_info(struct snd_kcontrol *kcontrol,
+                              struct snd_ctl_elem_info *uinfo)
+{
+       uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+       uinfo->count = 1;
+
+       return 0;
+}
+
+static int snd_pcm_iec958_get(struct snd_kcontrol *kcontrol,
+                             struct snd_ctl_elem_value *uctl)
+{
+       struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol);
+
+       mutex_lock(&sai->ctrl_lock);
+       memcpy(uctl->value.iec958.status, sai->iec958.status, 4);
+       mutex_unlock(&sai->ctrl_lock);
+
+       return 0;
+}
+
+static int snd_pcm_iec958_put(struct snd_kcontrol *kcontrol,
+                             struct snd_ctl_elem_value *uctl)
+{
+       struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol);
+
+       mutex_lock(&sai->ctrl_lock);
+       memcpy(sai->iec958.status, uctl->value.iec958.status, 4);
+       mutex_unlock(&sai->ctrl_lock);
+
+       return 0;
+}
+
+static const struct snd_kcontrol_new iec958_ctls = {
+       .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
+                       SNDRV_CTL_ELEM_ACCESS_VOLATILE),
+       .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+       .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+       .info = snd_pcm_iec958_info,
+       .get = snd_pcm_iec958_get,
+       .put = snd_pcm_iec958_put,
+};
+
 static irqreturn_t stm32_sai_isr(int irq, void *devid)
 {
        struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
@@ -619,6 +660,59 @@ static void stm32_sai_set_frame(struct snd_soc_dai *cpu_dai)
        }
 }
 
+static void stm32_sai_init_iec958_status(struct stm32_sai_sub_data *sai)
+{
+       unsigned char *cs = sai->iec958.status;
+
+       cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
+       cs[1] = IEC958_AES1_CON_GENERAL;
+       cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
+       cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID;
+}
+
+static void stm32_sai_set_iec958_status(struct stm32_sai_sub_data *sai,
+                                       struct snd_pcm_runtime *runtime)
+{
+       if (!runtime)
+               return;
+
+       /* Force the sample rate according to runtime rate */
+       mutex_lock(&sai->ctrl_lock);
+       switch (runtime->rate) {
+       case 22050:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_22050;
+               break;
+       case 44100:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_44100;
+               break;
+       case 88200:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_88200;
+               break;
+       case 176400:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_176400;
+               break;
+       case 24000:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_24000;
+               break;
+       case 48000:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_48000;
+               break;
+       case 96000:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_96000;
+               break;
+       case 192000:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_192000;
+               break;
+       case 32000:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_32000;
+               break;
+       default:
+               sai->iec958.status[3] = IEC958_AES3_CON_FS_NOTID;
+               break;
+       }
+       mutex_unlock(&sai->ctrl_lock);
+}
+
 static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
                                     struct snd_pcm_hw_params *params)
 {
@@ -709,7 +803,11 @@ static int stm32_sai_hw_params(struct snd_pcm_substream *substream,
 
        sai->data_size = params_width(params);
 
-       if (!STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
+       if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
+               /* Rate not already set in runtime structure */
+               substream->runtime->rate = params_rate(params);
+               stm32_sai_set_iec958_status(sai, substream->runtime);
+       } else {
                ret = stm32_sai_set_slots(cpu_dai);
                if (ret < 0)
                        return ret;
@@ -789,6 +887,20 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
        sai->substream = NULL;
 }
 
+static int stm32_sai_pcm_new(struct snd_soc_pcm_runtime *rtd,
+                            struct snd_soc_dai *cpu_dai)
+{
+       struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
+
+       if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
+               dev_dbg(&sai->pdev->dev, "%s: register iec controls", __func__);
+               return snd_ctl_add(rtd->pcm->card,
+                                  snd_ctl_new1(&iec958_ctls, sai));
+       }
+
+       return 0;
+}
+
 static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 {
        struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
@@ -809,6 +921,10 @@ static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
        else
                snd_soc_dai_init_dma_data(cpu_dai, NULL, &sai->dma_params);
 
+       /* Next settings are not relevant for spdif mode */
+       if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
+               return 0;
+
        cr1_mask = SAI_XCR1_RX_TX;
        if (STM_SAI_IS_CAPTURE(sai))
                cr1 |= SAI_XCR1_RX_TX;
@@ -820,10 +936,6 @@ static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
                                     sai->synco, sai->synci);
        }
 
-       if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
-               memcpy(sai->spdif_status_bits, default_status_bits,
-                      sizeof(default_status_bits));
-
        cr1_mask |= SAI_XCR1_SYNCEN_MASK;
        cr1 |= SAI_XCR1_SYNCEN_SET(sai->sync);
 
@@ -861,7 +973,7 @@ static int stm32_sai_pcm_process_spdif(struct snd_pcm_substream *substream,
                /* Set channel status bit */
                byte = frm_cnt >> 3;
                mask = 1 << (frm_cnt - (byte << 3));
-               if (sai->spdif_status_bits[byte] & mask)
+               if (sai->iec958.status[byte] & mask)
                        *ptr |= 0x04000000;
                ptr++;
 
@@ -888,6 +1000,7 @@ static const struct snd_pcm_hardware stm32_sai_pcm_hw = {
 static struct snd_soc_dai_driver stm32_sai_playback_dai[] = {
 {
                .probe = stm32_sai_dai_probe,
+               .pcm_new = stm32_sai_pcm_new,
                .id = 1, /* avoid call to fmt_single_name() */
                .playback = {
                        .channels_min = 1,
@@ -998,6 +1111,7 @@ static int stm32_sai_sub_parse_of(struct platform_device *pdev,
                        dev_err(&pdev->dev, "S/PDIF IEC60958 not supported\n");
                        return -EINVAL;
                }
+               stm32_sai_init_iec958_status(sai);
                sai->spdif = true;
                sai->master = true;
        }
@@ -1114,6 +1228,7 @@ static int stm32_sai_sub_probe(struct platform_device *pdev)
        sai->id = (uintptr_t)of_id->data;
 
        sai->pdev = pdev;
+       mutex_init(&sai->ctrl_lock);
        platform_set_drvdata(pdev, sai);
 
        sai->pdata = dev_get_drvdata(pdev->dev.parent);