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ctl: improve API documentation for threshold level operations

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In alsa-lib, threshold level operations require an array of unsigned-int
members, while there's little explanation about how to fill it. To usual
developers such as me, they're quite hard to understand.

This commit adds a few comment for easy understanding about how to use
the APIs.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2016-06-15 23:57:44 +09:00 • committed by Takashi Iwai
parent 677160d226
commit fe1b08803d
1 changed files with 15 additions and 15 deletions
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30
src/control/control.c
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@ -882,14 +882,12 @@ static int snd_ctl_tlv_do(snd_ctl_t *ctl, int op_flag,
return err;
}
/**
* \brief Get CTL element TLV value
* \param ctl CTL handle
* \param id CTL element id pointer
* \param tlv TLV array pointer to store
* \param tlv_size TLV array size in bytes
* \brief Set given data to an element as threshold level.
* \param ctl A handle of backend module for control interface.
* \param id ID of an element.
* \param tlv An array with members of unsigned int type.
* \param tlv_size The length of the array.
* \return 0 on success otherwise a negative error code
*/
int snd_ctl_elem_tlv_read(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
@ -913,10 +911,11 @@ int snd_ctl_elem_tlv_read(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
}
/**
* \brief Set CTL element TLV value
* \param ctl CTL handle
* \param id CTL element id pointer
* \param tlv TLV array pointer to store
* \brief Set given data to an element as threshold level.
* \param ctl A handle of backend module for control interface.
* \param id ID of an element.
* \param tlv An array with members of unsigned int type. The second member
* must represent total bytes of the rest of array.
* \retval 0 on success
* \retval >0 on success when value was changed
* \retval <0 a negative error code
@ -929,10 +928,11 @@ int snd_ctl_elem_tlv_write(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
}
/**
* \brief Process CTL element TLV command
* \param ctl CTL handle
* \param id CTL element id pointer
* \param tlv TLV array pointer to process
* \brief Set given data to an element as threshold level.
* \param ctl A handle of backend module for control interface.
* \param id ID of an element.
* \param tlv An array with members of unsigned int type. The second member
* must represent total bytes of the rest of array.
* \retval 0 on success
* \retval >0 on success when value was changed
* \retval <0 a negative error code