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authorTakashi Iwai <tiwai@suse.de>2015-02-24 14:59:42 +0100
committerTakashi Iwai <tiwai@suse.de>2015-03-23 13:17:27 +0100
commit3256be6537751f65c76b3ecfbb4e667f87525a2f (patch)
tree8dc85bb89fa5c5c23ebf815e0d4a825a0b9d4367 /sound/hda/hdac_device.c
parent7639a06c23c7d4cda34c2546bd7290d8753849ca (diff)
downloadlinux-3256be6537751f65c76b3ecfbb4e667f87525a2f.tar.bz2
ALSA: hda - Add widget sysfs tree
This patch changes the sysfs files assigned to the codec device on the bus which were formerly identical with hwdep sysfs files. Now it shows only a few core parameter, vendor_id, subsystem_id, revision_id, afg, mfg, vendor_name and chip_name. In addition, now a widget tree is added to the bus device sysfs directory for showing the widget topology and attributes. It's just a flat tree consisting of subdirectories named as the widget NID including various attributes like widget capability bits. The AFG (usually NID 0x01) is always found there, and it contains always amp_in_caps, amp_out_caps and power_caps files. Each of these attributes show a single value. The rest are the widget nodes belonging to that AFG. Note that the child node might not start from 0x02 but from another value like 0x0a. Each child node may contain caps, pin_caps, amp_in_caps, amp_out_caps, power_caps and connections files. The caps (representing the widget capability bits) always contain a value. The rest may contain value(s) if the attribute exists on the node. Only connections file show multiple values while other attributes have zero or one single value. An example of ls -R output is like below: % ls -R /sys/bus/hdaudio/devices/hdaudioC0D0/ /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/: 01/ 04/ 07/ 0a/ 0d/ 10/ 13/ 16/ 19/ 1c/ 1f/ 22/ 02/ 05/ 08/ 0b/ 0e/ 11/ 14/ 17/ 1a/ 1d/ 20/ 23/ 03/ 06/ 09/ 0c/ 0f/ 12/ 15/ 18/ 1b/ 1e/ 21/ /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/01: amp_in_caps amp_out_caps power_caps /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/02: amp_in_caps amp_out_caps caps connections pin_caps pin_cfg power_caps /sys/bus/hdaudio/devices/hdaudioC0D0/widgets/03: ..... Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/hdac_device.c')
-rw-r--r--sound/hda/hdac_device.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index a3f52ad4de37..1470ecc354db 100644
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -45,6 +45,7 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
dev->parent = bus->dev;
dev->bus = &snd_hda_bus_type;
dev->release = default_release;
+ dev->groups = hdac_dev_attr_groups;
dev_set_name(dev, "%s", name);
device_enable_async_suspend(dev);
@@ -128,6 +129,40 @@ void snd_hdac_device_exit(struct hdac_device *codec)
EXPORT_SYMBOL_GPL(snd_hdac_device_exit);
/**
+ * snd_hdac_device_register - register the hd-audio codec base device
+ * codec: the device to register
+ */
+int snd_hdac_device_register(struct hdac_device *codec)
+{
+ int err;
+
+ err = device_add(&codec->dev);
+ if (err < 0)
+ return err;
+ err = hda_widget_sysfs_init(codec);
+ if (err < 0) {
+ device_del(&codec->dev);
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_device_register);
+
+/**
+ * snd_hdac_device_unregister - unregister the hd-audio codec base device
+ * codec: the device to unregister
+ */
+void snd_hdac_device_unregister(struct hdac_device *codec)
+{
+ if (device_is_registered(&codec->dev)) {
+ hda_widget_sysfs_exit(codec);
+ device_del(&codec->dev);
+ }
+}
+EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);
+
+/**
* snd_hdac_make_cmd - compose a 32bit command word to be sent to the
* HD-audio controller
* @codec: the codec object