Add attribute and show the components string. This is useful to see what is provided to userspace and e.g. used by UCM to understand the card configuration:
root@plb:~# more /sys/class/sound/card0/components HDA:8086280b,80860101,00100000 cfg-spk:2 hs:rt711 spk:rt1308 mic:rt715
Note that the style uses what's recommended by checkpatch.pl and is slightly different from other sysfs attributes.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/core/init.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/sound/core/init.c b/sound/core/init.c index b02a99766351..decaf944a8ad 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -695,9 +695,21 @@ card_number_show_attr(struct device *dev,
static DEVICE_ATTR(number, 0444, card_number_show_attr, NULL);
+static ssize_t +components_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct snd_card *card = container_of(dev, struct snd_card, card_dev); + + return scnprintf(buf, PAGE_SIZE, "%s\n", card->components); +} + +static DEVICE_ATTR_RO(components); + static struct attribute *card_dev_attrs[] = { &dev_attr_id.attr, &dev_attr_number.attr, + &dev_attr_components.attr, NULL };