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ALSA: hdac: Copy codec helpers to core

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The current codec helpers are local to hda code and needs to be moved to
core so that other users can use it.
The helpers to read/write the codec and to check the
power state of widgets is copied

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Subhransu S. Prusty 2015-10-08 09:48:05 +01:00 committed by Takashi Iwai
parent a04267fd87
commit 1b5e6167c2
2 changed files with 87 additions and 0 deletions
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6
include/sound/hdaudio.h
View File

@ -147,6 +147,12 @@ int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
unsigned int format);
int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm);
int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm);
bool snd_hdac_check_power_state(struct hdac_device *hdac,
hda_nid_t nid, unsigned int target_state);
/**
* snd_hdac_read_parm - read a codec parameter
* @codec: the codec object

81
sound/hda/hdac_device.c
View File

@ -952,3 +952,84 @@ bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
return true;
}
EXPORT_SYMBOL_GPL(snd_hdac_is_supported_format);
static unsigned int codec_read(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm)
{
unsigned int cmd = snd_hdac_make_cmd(hdac, nid, verb, parm);
unsigned int res;
if (snd_hdac_exec_verb(hdac, cmd, flags, &res))
return -1;
return res;
}
static int codec_write(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm)
{
unsigned int cmd = snd_hdac_make_cmd(hdac, nid, verb, parm);
return snd_hdac_exec_verb(hdac, cmd, flags, NULL);
}
/**
* snd_hdac_codec_read - send a command and get the response
* @hdac: the HDAC device
* @nid: NID to send the command
* @flags: optional bit flags
* @verb: the verb to send
* @parm: the parameter for the verb
*
* Send a single command and read the corresponding response.
*
* Returns the obtained response value, or -1 for an error.
*/
int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm)
{
return codec_read(hdac, nid, flags, verb, parm);
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_read);
/**
* snd_hdac_codec_write - send a single command without waiting for response
* @hdac: the HDAC device
* @nid: NID to send the command
* @flags: optional bit flags
* @verb: the verb to send
* @parm: the parameter for the verb
*
* Send a single command without waiting for response.
*
* Returns 0 if successful, or a negative error code.
*/
int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
int flags, unsigned int verb, unsigned int parm)
{
return codec_write(hdac, nid, flags, verb, parm);
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_write);
/*
* snd_hdac_check_power_state: check whether the actual power state matches
* with the target state
*
* @hdac: the HDAC device
* @nid: NID to send the command
* @target_state: target state to check for
*
* Return true if state matches, false if not
*/
bool snd_hdac_check_power_state(struct hdac_device *hdac,
hda_nid_t nid, unsigned int target_state)
{
unsigned int state = codec_read(hdac, nid, 0,
AC_VERB_GET_POWER_STATE, 0);
if (state & AC_PWRST_ERROR)
return true;
state = (state >> 4) & 0x0f;
return (state == target_state);
}
EXPORT_SYMBOL_GPL(snd_hdac_check_power_state);