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ASoC: Add DAI list to debugfs

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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>
This commit is contained in:
Mark Brown 2010-09-15 18:19:07 +01:00
parent c3c5a19a50
commit f320878032
1 changed files with 29 additions and 0 deletions
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29
sound/soc/soc-core.c
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@ -297,6 +297,32 @@ 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)
@ -3223,6 +3249,9 @@ 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);