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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

sound/soc/soc-core.c

+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);