[alsa-devel] [PATCH] ALSA: hda - Add / fix kernel doc comments
Takashi Iwai
tiwai at suse.de
Wed Oct 28 12:38:07 CET 2015
Give some readable comment in kernel doc style for each exported
function, as I promised in the previous meetings. While we're at it,
fix the wrong comments, too.
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
sound/hda/hdac_bus.c | 14 ++++++++++
sound/hda/hdac_device.c | 10 ++++---
sound/hda/hdac_i915.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++
sound/hda/hdac_regmap.c | 10 +++++++
sound/hda/hdac_stream.c | 3 ++-
5 files changed, 102 insertions(+), 5 deletions(-)
diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 27c447e4fe5c..0e81ea89a596 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -172,6 +172,15 @@ static void process_unsol_events(struct work_struct *work)
}
}
+/**
+ * snd_hdac_bus_add_device - Add a codec to bus
+ * @bus: HDA core bus
+ * @codec: HDA core device to add
+ *
+ * Adds the given codec to the list in the bus. The caddr_tbl array
+ * and codec_powered bits are updated, as well.
+ * Returns zero if success, or a negative error code.
+ */
int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
{
if (bus->caddr_tbl[codec->addr]) {
@@ -188,6 +197,11 @@ int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
+/**
+ * snd_hdac_bus_remove_device - Remove a codec from bus
+ * @bus: HDA core bus
+ * @codec: HDA core device to remove
+ */
void snd_hdac_bus_remove_device(struct hdac_bus *bus,
struct hdac_device *codec)
{
diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index bbdb25f5bbb9..e361024eabb6 100644
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -629,8 +629,10 @@ int snd_hdac_power_down_pm(struct hdac_device *codec)
EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
#endif
-/*
- * Enable/disable the link power for a codec.
+/**
+ * snd_hdac_link_power - Enable/disable the link power for a codec
+ * @codec: the codec object
+ * @bool: enable or disable the link power
*/
int snd_hdac_link_power(struct hdac_device *codec, bool enable)
{
@@ -1048,8 +1050,8 @@ int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_write);
-/*
- * snd_hdac_check_power_state: check whether the actual power state matches
+/**
+ * snd_hdac_check_power_state - check whether the actual power state matches
* with the target state
*
* @hdac: the HDAC device
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index 55c3df4458f7..8fef1b8d1fd8 100644
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -23,6 +23,19 @@
static struct i915_audio_component *hdac_acomp;
+/**
+ * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
+ * @bus: HDA core bus
+ * @enable: enable or disable the wakeup
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function should be called during the chip reset, also called at
+ * resume for updating STATESTS register read.
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
{
struct i915_audio_component *acomp = bus->audio_component;
@@ -45,6 +58,19 @@ int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
}
EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
+/**
+ * snd_hdac_display_power - Power up / down the power refcount
+ * @bus: HDA core bus
+ * @enable: power up or down
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function manages a refcount and calls the i915 get_power() and
+ * put_power() ops accordingly, toggling the codec wakeup, too.
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
{
struct i915_audio_component *acomp = bus->audio_component;
@@ -71,6 +97,16 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
}
EXPORT_SYMBOL_GPL(snd_hdac_display_power);
+/**
+ * snd_hdac_get_display_clk - Get CDCLK in kHz
+ * @bus: HDA core bus
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function queries CDCLK value in kHz from the graphics driver and
+ * returns the value. A negative code is returned in error.
+ */
int snd_hdac_get_display_clk(struct hdac_bus *bus)
{
struct i915_audio_component *acomp = bus->audio_component;
@@ -134,6 +170,17 @@ static int hdac_component_master_match(struct device *dev, void *data)
return !strcmp(dev->driver->name, "i915");
}
+/**
+ * snd_hdac_i915_register_notifier - Register i915 audio component ops
+ * @aops: i915 audio component ops
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function sets the given ops to be called by the i915 graphics driver.
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
{
if (WARN_ON(!hdac_acomp))
@@ -144,6 +191,18 @@ int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
+/**
+ * snd_hdac_i915_init - Initialize i915 audio component
+ * @bus: HDA core bus
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function initializes and sets up the audio component to communicate
+ * with i915 graphics driver.
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_i915_init(struct hdac_bus *bus)
{
struct component_match *match = NULL;
@@ -187,6 +246,17 @@ out_err:
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
+/**
+ * snd_hdac_i915_exit - Finalize i915 audio component
+ * @bus: HDA core bus
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with i915 graphics.
+ *
+ * This function releases the i915 audio component that has been used.
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_i915_exit(struct hdac_bus *bus)
{
struct device *dev = bus->dev;
diff --git a/sound/hda/hdac_regmap.c b/sound/hda/hdac_regmap.c
index b0ed870ffb88..eb8f7c30cb09 100644
--- a/sound/hda/hdac_regmap.c
+++ b/sound/hda/hdac_regmap.c
@@ -339,6 +339,12 @@ static const struct regmap_config hda_regmap_cfg = {
.use_single_rw = true,
};
+/**
+ * snd_hdac_regmap_init - Initialize regmap for HDA register accesses
+ * @codec: the codec object
+ *
+ * Returns zero for success or a negative error code.
+ */
int snd_hdac_regmap_init(struct hdac_device *codec)
{
struct regmap *regmap;
@@ -352,6 +358,10 @@ int snd_hdac_regmap_init(struct hdac_device *codec)
}
EXPORT_SYMBOL_GPL(snd_hdac_regmap_init);
+/**
+ * snd_hdac_regmap_init - Release the regmap from HDA codec
+ * @codec: the codec object
+ */
void snd_hdac_regmap_exit(struct hdac_device *codec)
{
if (codec->regmap) {
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 8981159813ef..38990a77d7b7 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -426,7 +426,8 @@ int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev)
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods);
-/* snd_hdac_stream_set_params - set stream parameters
+/**
+ * snd_hdac_stream_set_params - set stream parameters
* @azx_dev: HD-audio core stream for which parameters are to be set
* @format_val: format value parameter
*
--
2.6.2
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