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 --- sound/soc/soc-core.c | 29 +++++++++++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 5e4a1f4..d4ae93c 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -298,6 +298,32 @@ static const struct file_operations codec_list_fops = { .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) @@ -3224,6 +3250,9 @@ static int __init snd_soc_init(void) &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);