At Tue, 7 Jul 2009 12:34:16 +0530, Harsha, Priya wrote: > > > > >-----Original Message----- > >From: Takashi Iwai [mailto:tiwai@xxxxxxx] > >Sent: Tuesday, July 07, 2009 12:19 PM > >To: Harsha, Priya > >Cc: Koul, Vinod; alsa-devel@xxxxxxxxxxxxxxxx > >Subject: Re: [PATCH] [RFC 8/13] Intel SST sound card driver > > > >At Tue, 7 Jul 2009 11:50:46 +0530, > >Harsha, Priya wrote: > >> > >> > > >> >> + .access = SNDRV_CTL_ELEM_ACCESS_READWRITE, > >> >> + .info = snd_intelmad_line_volume_info, > >> >> + .get = snd_intelmad_volume_get, > >> >> + .put = snd_intelmad_volume_set, > >> > > >> >Can it have the dB information via TLV? > >> No. It actually differs across the 3 sound cards supported and it's > >> not a direct TLV that can be used. > > > >Then you'd set a static TLV entry after creating the ctl element > >instance, or return a TLV entry dynamically via the tlv callback. > Sorry I misunderstood. The value that is passed in min and max is in > dB. > For min and max values, it's a static dB value that I return. But > when the volume adjustments need to be done, based on the value > given by ALSA, I set the sound card registers to reflect that dB > value. The value to be set is always raw. That is, alsa-lib computes the raw value from the given dB value based on the TLV information (dB min/max), supposing the volume scale is logarithmic. Isn't it the case for you? > When volume is queried for, I read the specific sound card > register and return the dB value to ALSA. > Will this implementation be ok? Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
