Commit 78dd5e21 authored by Takashi Iwai's avatar Takashi Iwai

ALSA: hda - Add / fix kernel doc comments

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: default avatarTakashi Iwai <tiwai@suse.de>
parent e5e113cf
......@@ -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)
{
......
......@@ -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
......
......@@ -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 @@ int snd_hdac_i915_init(struct hdac_bus *bus)
}
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;
......
......@@ -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) {
......
......@@ -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
*
......
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