ASoC: Add DAI list to debugfs
Allow the user to inspect the list of registered DAIs at runtime to
improve diagnostics for machine driver setup.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 94a2edf..63d93b3 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -297,6 +297,32 @@
.llseek = default_llseek,/* read accesses f_pos */
};
+static ssize_t dai_list_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ ssize_t ret = 0;
+ struct snd_soc_dai *dai;
+
+ if (!buf)
+ return -ENOMEM;
+
+ list_for_each_entry(dai, &dai_list, list)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", dai->name);
+
+ if (ret >= 0)
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+
+ return ret;
+}
+
+static const struct file_operations dai_list_fops = {
+ .read = dai_list_read_file,
+ .llseek = default_llseek,/* read accesses f_pos */
+};
+
#else
static inline void soc_init_codec_debugfs(struct snd_soc_codec *codec)
@@ -3223,6 +3249,9 @@
&codec_list_fops))
pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
+ if (!debugfs_create_file("dais", 0444, debugfs_root, NULL,
+ &dai_list_fops))
+ pr_warn("ASoC: Failed to create DAI list debugfs file\n");
#endif
return platform_driver_register(&soc_driver);