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>
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@ -297,6 +297,32 @@ static const struct file_operations codec_list_fops = {
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.llseek = default_llseek,/* read accesses f_pos */
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};
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static ssize_t dai_list_read_file(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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ssize_t ret = 0;
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struct snd_soc_dai *dai;
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if (!buf)
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return -ENOMEM;
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list_for_each_entry(dai, &dai_list, list)
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ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", dai->name);
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if (ret >= 0)
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ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
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kfree(buf);
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return ret;
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}
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static const struct file_operations dai_list_fops = {
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.read = dai_list_read_file,
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.llseek = default_llseek,/* read accesses f_pos */
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};
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#else
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static inline void soc_init_codec_debugfs(struct snd_soc_codec *codec)
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@ -3223,6 +3249,9 @@ static int __init snd_soc_init(void)
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&codec_list_fops))
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pr_warn("ASoC: Failed to create CODEC list debugfs file\n");
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if (!debugfs_create_file("dais", 0444, debugfs_root, NULL,
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&dai_list_fops))
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pr_warn("ASoC: Failed to create DAI list debugfs file\n");
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#endif
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return platform_driver_register(&soc_driver);
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