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: Takashi Iwai <tiwai@suse.de>
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Takashi Iwai
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e5e113cf0d
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78dd5e21b0
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@ -172,6 +172,15 @@ static void process_unsol_events(struct work_struct *work)
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}
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}
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/**
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* snd_hdac_bus_add_device - Add a codec to bus
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* @bus: HDA core bus
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* @codec: HDA core device to add
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*
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* Adds the given codec to the list in the bus. The caddr_tbl array
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* and codec_powered bits are updated, as well.
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* Returns zero if success, or a negative error code.
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*/
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int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
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{
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if (bus->caddr_tbl[codec->addr]) {
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@ -188,6 +197,11 @@ int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
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/**
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* snd_hdac_bus_remove_device - Remove a codec from bus
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* @bus: HDA core bus
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* @codec: HDA core device to remove
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*/
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void snd_hdac_bus_remove_device(struct hdac_bus *bus,
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struct hdac_device *codec)
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{
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@ -629,8 +629,10 @@ int snd_hdac_power_down_pm(struct hdac_device *codec)
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EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
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#endif
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/*
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* Enable/disable the link power for a codec.
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/**
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* snd_hdac_link_power - Enable/disable the link power for a codec
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* @codec: the codec object
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* @bool: enable or disable the link power
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*/
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int snd_hdac_link_power(struct hdac_device *codec, bool enable)
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{
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@ -1048,8 +1050,8 @@ int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
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}
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EXPORT_SYMBOL_GPL(snd_hdac_codec_write);
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/*
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* snd_hdac_check_power_state: check whether the actual power state matches
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/**
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* snd_hdac_check_power_state - check whether the actual power state matches
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* with the target state
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*
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* @hdac: the HDAC device
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@ -23,6 +23,19 @@
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static struct i915_audio_component *hdac_acomp;
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/**
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* snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
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* @bus: HDA core bus
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* @enable: enable or disable the wakeup
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function should be called during the chip reset, also called at
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* resume for updating STATESTS register read.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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@ -45,6 +58,19 @@ int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
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}
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EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
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/**
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* snd_hdac_display_power - Power up / down the power refcount
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* @bus: HDA core bus
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* @enable: power up or down
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function manages a refcount and calls the i915 get_power() and
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* put_power() ops accordingly, toggling the codec wakeup, too.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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@ -71,6 +97,16 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
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}
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EXPORT_SYMBOL_GPL(snd_hdac_display_power);
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/**
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* snd_hdac_get_display_clk - Get CDCLK in kHz
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function queries CDCLK value in kHz from the graphics driver and
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* returns the value. A negative code is returned in error.
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*/
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int snd_hdac_get_display_clk(struct hdac_bus *bus)
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{
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struct i915_audio_component *acomp = bus->audio_component;
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@ -134,6 +170,17 @@ static int hdac_component_master_match(struct device *dev, void *data)
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return !strcmp(dev->driver->name, "i915");
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}
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/**
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* snd_hdac_i915_register_notifier - Register i915 audio component ops
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* @aops: i915 audio component ops
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function sets the given ops to be called by the i915 graphics driver.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
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{
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if (WARN_ON(!hdac_acomp))
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@ -144,6 +191,18 @@ int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
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/**
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* snd_hdac_i915_init - Initialize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function initializes and sets up the audio component to communicate
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* with i915 graphics driver.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_init(struct hdac_bus *bus)
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{
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struct component_match *match = NULL;
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@ -187,6 +246,17 @@ out_err:
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}
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EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
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/**
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* snd_hdac_i915_exit - Finalize i915 audio component
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* @bus: HDA core bus
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*
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* This function is supposed to be used only by a HD-audio controller
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* driver that needs the interaction with i915 graphics.
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*
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* This function releases the i915 audio component that has been used.
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_i915_exit(struct hdac_bus *bus)
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{
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struct device *dev = bus->dev;
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@ -339,6 +339,12 @@ static const struct regmap_config hda_regmap_cfg = {
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.use_single_rw = true,
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};
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/**
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* snd_hdac_regmap_init - Initialize regmap for HDA register accesses
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* @codec: the codec object
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*
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* Returns zero for success or a negative error code.
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*/
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int snd_hdac_regmap_init(struct hdac_device *codec)
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{
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struct regmap *regmap;
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@ -352,6 +358,10 @@ int snd_hdac_regmap_init(struct hdac_device *codec)
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}
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EXPORT_SYMBOL_GPL(snd_hdac_regmap_init);
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/**
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* snd_hdac_regmap_init - Release the regmap from HDA codec
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* @codec: the codec object
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*/
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void snd_hdac_regmap_exit(struct hdac_device *codec)
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{
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if (codec->regmap) {
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@ -426,7 +426,8 @@ int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev)
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}
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EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods);
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/* snd_hdac_stream_set_params - set stream parameters
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/**
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* snd_hdac_stream_set_params - set stream parameters
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* @azx_dev: HD-audio core stream for which parameters are to be set
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* @format_val: format value parameter
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*
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