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Commit f3208780 authored by Mark Brown's avatar Mark Brown
Browse files

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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
parent c3c5a19a
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+29 −0
Original line number Diff line number Diff line
@@ -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);