ASoC: wm_adsp: Add support for opening a compressed stream

Allow user-space to open a compressed stream, although no data will be
passed yet, as part of this adding the ability to define supported
capabilities per firmware and check these match the stream being opened.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 191 insertions, 3 deletions

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 27abad9c6e73..d81ed218918e 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -229,8 +229,42 @@ static const char *wm_adsp_fw_text[WM_ADSP_NUM_FW] = {
 	[WM_ADSP_FW_MISC] =     "Misc",
 };
 
-static struct {
+struct wm_adsp_compr {
+	struct wm_adsp *dsp;
+
+	struct snd_compr_stream *stream;
+	struct snd_compressed_buffer size;
+};
+
+#define WM_ADSP_DATA_WORD_SIZE         3
+
+#define WM_ADSP_MIN_FRAGMENTS          1
+#define WM_ADSP_MAX_FRAGMENTS          256
+#define WM_ADSP_MIN_FRAGMENT_SIZE      (64 * WM_ADSP_DATA_WORD_SIZE)
+#define WM_ADSP_MAX_FRAGMENT_SIZE      (4096 * WM_ADSP_DATA_WORD_SIZE)
+
+struct wm_adsp_fw_caps {
+	u32 id;
+	struct snd_codec_desc desc;
+};
+
+static const struct wm_adsp_fw_caps ez2control_caps[] = {
+	{
+		.id = SND_AUDIOCODEC_BESPOKE,
+		.desc = {
+			.max_ch = 1,
+			.sample_rates = { 16000 },
+			.num_sample_rates = 1,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE,
+		},
+	},
+};
+
+static const struct {
 	const char *file;
+	int compr_direction;
+	int num_caps;
+	const struct wm_adsp_fw_caps *caps;
 } wm_adsp_fw[WM_ADSP_NUM_FW] = {
 	[WM_ADSP_FW_MBC_VSS] =  { .file = "mbc-vss" },
 	[WM_ADSP_FW_HIFI] =     { .file = "hifi" },
@@ -238,7 +272,12 @@ static struct {
 	[WM_ADSP_FW_TX_SPK] =   { .file = "tx-spk" },
 	[WM_ADSP_FW_RX] =       { .file = "rx" },
 	[WM_ADSP_FW_RX_ANC] =   { .file = "rx-anc" },
-	[WM_ADSP_FW_CTRL] =     { .file = "ctrl" },
+	[WM_ADSP_FW_CTRL] =     {
+		.file = "ctrl",
+		.compr_direction = SND_COMPRESS_CAPTURE,
+		.num_caps = ARRAY_SIZE(ez2control_caps),
+		.caps = ez2control_caps,
+	},
 	[WM_ADSP_FW_ASR] =      { .file = "asr" },
 	[WM_ADSP_FW_TRACE] =    { .file = "trace" },
 	[WM_ADSP_FW_SPK_PROT] = { .file = "spk-prot" },
@@ -461,7 +500,7 @@ static int wm_adsp_fw_put(struct snd_kcontrol *kcontrol,
 
 	mutex_lock(&dsp[e->shift_l].pwr_lock);
 
-	if (dsp[e->shift_l].running)
+	if (dsp[e->shift_l].running || dsp[e->shift_l].compr)
 		ret = -EBUSY;
 	else
 		dsp[e->shift_l].fw = ucontrol->value.integer.value[0];
@@ -2178,4 +2217,153 @@ int wm_adsp2_init(struct wm_adsp *dsp)
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_init);
 
+int wm_adsp_compr_open(struct wm_adsp *dsp, struct snd_compr_stream *stream)
+{
+	struct wm_adsp_compr *compr;
+	int ret = 0;
+
+	mutex_lock(&dsp->pwr_lock);
+
+	if (wm_adsp_fw[dsp->fw].num_caps == 0) {
+		adsp_err(dsp, "Firmware does not support compressed API\n");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	if (wm_adsp_fw[dsp->fw].compr_direction != stream->direction) {
+		adsp_err(dsp, "Firmware does not support stream direction\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	compr = kzalloc(sizeof(*compr), GFP_KERNEL);
+	if (!compr) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	compr->dsp = dsp;
+	compr->stream = stream;
+
+	dsp->compr = compr;
+
+	stream->runtime->private_data = compr;
+
+out:
+	mutex_unlock(&dsp->pwr_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(wm_adsp_compr_open);
+
+int wm_adsp_compr_free(struct snd_compr_stream *stream)
+{
+	struct wm_adsp_compr *compr = stream->runtime->private_data;
+	struct wm_adsp *dsp = compr->dsp;
+
+	mutex_lock(&dsp->pwr_lock);
+
+	dsp->compr = NULL;
+
+	kfree(compr);
+
+	mutex_unlock(&dsp->pwr_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wm_adsp_compr_free);
+
+static int wm_adsp_compr_check_params(struct snd_compr_stream *stream,
+				      struct snd_compr_params *params)
+{
+	struct wm_adsp_compr *compr = stream->runtime->private_data;
+	struct wm_adsp *dsp = compr->dsp;
+	const struct wm_adsp_fw_caps *caps;
+	const struct snd_codec_desc *desc;
+	int i, j;
+
+	if (params->buffer.fragment_size < WM_ADSP_MIN_FRAGMENT_SIZE ||
+	    params->buffer.fragment_size > WM_ADSP_MAX_FRAGMENT_SIZE ||
+	    params->buffer.fragments < WM_ADSP_MIN_FRAGMENTS ||
+	    params->buffer.fragments > WM_ADSP_MAX_FRAGMENTS ||
+	    params->buffer.fragment_size % WM_ADSP_DATA_WORD_SIZE) {
+		adsp_err(dsp, "Invalid buffer fragsize=%d fragments=%d\n",
+			 params->buffer.fragment_size,
+			 params->buffer.fragments);
+
+		return -EINVAL;
+	}
+
+	for (i = 0; i < wm_adsp_fw[dsp->fw].num_caps; i++) {
+		caps = &wm_adsp_fw[dsp->fw].caps[i];
+		desc = &caps->desc;
+
+		if (caps->id != params->codec.id)
+			continue;
+
+		if (stream->direction == SND_COMPRESS_PLAYBACK) {
+			if (desc->max_ch < params->codec.ch_out)
+				continue;
+		} else {
+			if (desc->max_ch < params->codec.ch_in)
+				continue;
+		}
+
+		if (!(desc->formats & (1 << params->codec.format)))
+			continue;
+
+		for (j = 0; j < desc->num_sample_rates; ++j)
+			if (desc->sample_rates[j] == params->codec.sample_rate)
+				return 0;
+	}
+
+	adsp_err(dsp, "Invalid params id=%u ch=%u,%u rate=%u fmt=%u\n",
+		 params->codec.id, params->codec.ch_in, params->codec.ch_out,
+		 params->codec.sample_rate, params->codec.format);
+	return -EINVAL;
+}
+
+int wm_adsp_compr_set_params(struct snd_compr_stream *stream,
+			     struct snd_compr_params *params)
+{
+	struct wm_adsp_compr *compr = stream->runtime->private_data;
+	int ret;
+
+	ret = wm_adsp_compr_check_params(stream, params);
+	if (ret)
+		return ret;
+
+	compr->size = params->buffer;
+
+	adsp_dbg(compr->dsp, "fragment_size=%d fragments=%d\n",
+		 compr->size.fragment_size, compr->size.fragments);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wm_adsp_compr_set_params);
+
+int wm_adsp_compr_get_caps(struct snd_compr_stream *stream,
+			   struct snd_compr_caps *caps)
+{
+	struct wm_adsp_compr *compr = stream->runtime->private_data;
+	int fw = compr->dsp->fw;
+	int i;
+
+	if (wm_adsp_fw[fw].caps) {
+		for (i = 0; i < wm_adsp_fw[fw].num_caps; i++)
+			caps->codecs[i] = wm_adsp_fw[fw].caps[i].id;
+
+		caps->num_codecs = i;
+		caps->direction = wm_adsp_fw[fw].compr_direction;
+
+		caps->min_fragment_size = WM_ADSP_MIN_FRAGMENT_SIZE;
+		caps->max_fragment_size = WM_ADSP_MAX_FRAGMENT_SIZE;
+		caps->min_fragments = WM_ADSP_MIN_FRAGMENTS;
+		caps->max_fragments = WM_ADSP_MAX_FRAGMENTS;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wm_adsp_compr_get_caps);
+
 MODULE_LICENSE("GPL v2");