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ASoC: Add helper functions bias level management

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Currently drivers are responsible for managing the bias_level field of
their DAPM context. The DAPM state itself is managed by the DAPM core
though and the core has certain expectations on how and when the bias_level
field should be updated. If drivers don't adhere to these undefined
behavior can occur.

This patch adds a few helper functions for manipulating the DAPM context
state, each function with a description on when it should be used and what
its effects are. This will also help us to move more of the bias_level
management from drivers to the DAPM core.

For convenience also add snd_soc_codec_* wrappers around these helpers.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lars-Peter Clausen
2015-04-27 22:13:23 +02:00
committed by Mark Brown
parent 39ed68c8cd
commit fa880775ab
3 changed files with 105 additions and 4 deletions
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34
include/sound/soc-dapm.h
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@@ -444,6 +444,9 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
struct snd_kcontrol *kcontrol);
int snd_soc_dapm_force_bias_level(struct snd_soc_dapm_context *dapm,
enum snd_soc_bias_level level);
/* dapm widget types */
enum snd_soc_dapm_type {
snd_soc_dapm_input = 0, /* input pin */
@@ -623,4 +626,35 @@ struct snd_soc_dapm_stats {
int neighbour_checks;
};
/**
* snd_soc_dapm_init_bias_level() - Initialize DAPM bias level
* @dapm: The DAPM context to initialize
* @level: The DAPM level to initialize to
*
* This function only sets the driver internal state of the DAPM level and will
* not modify the state of the device. Hence it should not be used during normal
* operation, but only to synchronize the internal state to the device state.
* E.g. during driver probe to set the DAPM level to the one corresponding with
* the power-on reset state of the device.
*
* To change the DAPM state of the device use snd_soc_dapm_set_bias_level().
*/
static inline void snd_soc_dapm_init_bias_level(
struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
{
dapm->bias_level = level;
}
/**
* snd_soc_dapm_get_bias_level() - Get current DAPM bias level
* @dapm: The context for which to get the bias level
*
* Returns: The current bias level of the passed DAPM context.
*/
static inline enum snd_soc_bias_level snd_soc_dapm_get_bias_level(
struct snd_soc_dapm_context *dapm)
{
return dapm->bias_level;
}
#endif