ASoC: DSP: Add state and hw_params info to debugfs

Add information about state and hw_params for FE and its
BE clients.

Change-Id: Ia0e88a3318ee176fcb89e36e5183e3938d0b5019
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/sound/soc/soc-dsp.c b/sound/soc/soc-dsp.c
index 2692255..ebb3dd7 100644
--- a/sound/soc/soc-dsp.c
+++ b/sound/soc/soc-dsp.c
@@ -1538,6 +1538,125 @@ int soc_dsp_fe_dai_close(struct snd_pcm_substream *fe_substream)
 }
 
 #ifdef CONFIG_DEBUG_FS
+static char *dsp_state_string(enum snd_soc_dsp_state state)
+{
+	switch (state) {
+	case SND_SOC_DSP_STATE_NEW:
+		return "new";
+	case SND_SOC_DSP_STATE_OPEN:
+		return "open";
+	case SND_SOC_DSP_STATE_HW_PARAMS:
+		return "hw_params";
+	case SND_SOC_DSP_STATE_PREPARE:
+		return "prepare";
+	case SND_SOC_DSP_STATE_START:
+		return "start";
+	case SND_SOC_DSP_STATE_STOP:
+		return "stop";
+	case SND_SOC_DSP_STATE_HW_FREE:
+		return "hw_free";
+	case SND_SOC_DSP_STATE_CLOSE:
+		return "close";
+	}
+
+	return "unknown";
+}
+
+static int soc_dsp_state_open_file(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t soc_dsp_show_state(struct snd_soc_pcm_runtime *fe,
+				int stream, char *buf, size_t size)
+{
+	struct snd_pcm_hw_params *params = &fe->dsp[stream].hw_params;
+	struct snd_soc_dsp_params *dsp_params;
+	ssize_t offset = 0;
+
+	/* FE state */
+	offset += snprintf(buf + offset, size - offset,
+			"[%s - %s]\n", fe->dai_link->name,
+			stream ? "Capture" : "Playback");
+
+	offset += snprintf(buf + offset, size - offset, "State: %s\n",
+	                dsp_state_string(fe->dsp[stream].state));
+
+	if ((fe->dsp[stream].state >= SND_SOC_DSP_STATE_HW_PARAMS) &&
+	    (fe->dsp[stream].state <= SND_SOC_DSP_STATE_STOP))
+		offset += snprintf(buf + offset, size - offset,
+				"Hardware Params: "
+				"Format = %s, Channels = %d, Rate = %d\n",
+				snd_pcm_format_name(params_format(params)),
+				params_channels(params),
+				params_rate(params));
+
+	/* BEs state */
+	offset += snprintf(buf + offset, size - offset, "Backends:\n");
+
+	if (list_empty(&fe->dsp[stream].be_clients)) {
+		offset += snprintf(buf + offset, size - offset,
+				" No active DSP links\n");
+		goto out;
+	}
+
+	list_for_each_entry(dsp_params, &fe->dsp[stream].be_clients, list_be) {
+		struct snd_soc_pcm_runtime *be = dsp_params->be;
+
+		offset += snprintf(buf + offset, size - offset,
+				"- %s\n", be->dai_link->name);
+
+		offset += snprintf(buf + offset, size - offset,
+				"   State: %s\n",
+				dsp_state_string(fe->dsp[stream].state));
+
+		if ((be->dsp[stream].state >= SND_SOC_DSP_STATE_HW_PARAMS) &&
+		    (be->dsp[stream].state <= SND_SOC_DSP_STATE_STOP))
+			offset += snprintf(buf + offset, size - offset,
+				"   Hardware Params: "
+				"Format = %s, Channels = %d, Rate = %d\n",
+				snd_pcm_format_name(params_format(params)),
+				params_channels(params),
+				params_rate(params));
+	}
+
+out:
+	return offset;
+}
+
+static ssize_t soc_dsp_state_read_file(struct file *file, char __user *user_buf,
+				size_t count, loff_t *ppos)
+{
+	struct snd_soc_pcm_runtime *fe = file->private_data;
+	ssize_t out_count = PAGE_SIZE, offset = 0, ret = 0;
+	char *buf;
+
+	buf = kmalloc(out_count, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	if (fe->cpu_dai->driver->playback.channels_min)
+		offset += soc_dsp_show_state(fe, SNDRV_PCM_STREAM_PLAYBACK,
+					buf + offset, out_count - offset);
+
+	if (fe->cpu_dai->driver->capture.channels_min)
+		offset += soc_dsp_show_state(fe, SNDRV_PCM_STREAM_CAPTURE,
+					buf + offset, out_count - offset);
+
+        ret = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
+
+        kfree(buf);
+
+        return ret;
+}
+
+static const struct file_operations soc_dsp_state_fops = {
+	.open = soc_dsp_state_open_file,
+	.read = soc_dsp_state_read_file,
+	.llseek = default_llseek,
+};
+
 int soc_dsp_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 {
 	rtd->debugfs_dsp_root = debugfs_create_dir(rtd->dai_link->name,
@@ -1549,6 +1668,10 @@ int soc_dsp_debugfs_add(struct snd_soc_pcm_runtime *rtd)
 		return -EINVAL;
 	}
 
+	rtd->debugfs_dsp_state = debugfs_create_file("state", 0644,
+						rtd->debugfs_dsp_root,
+						rtd, &soc_dsp_state_fops);
+
 	return 0;
 }
 #endif