Re: AW: maestro3 hardware volume control

[Takashi Iwai <tiwai@suse.de>]

At Tue, 19 Apr 2005 12:55:00 +0200,
Rüdiger Dabelow wrote:
> 
> > Von: Takashi Iwai
> > Gesendet: Dienstag, 19. April 2005 11:50
> > Betreff: Re: [Alsa-devel] maestro3 hardware volume control
> > 
> > At Mon, 18 Apr 2005 15:22:58 +0200,
> > rwd wrote:
> > > 
> > > Hi,
> > > 
> > > the maestro3 runs fine on my compaq evo n400c (ES1988). 
> > Just one thing
> > > remains unsolved - the 2 nice volume control buttons that 
> > seem to be wired
> > > directly to the ES1988 won't work until now. 
> > > 
> > > I'm relatively new to linux and not a driver programmer, 
> > but scrolling
> > > through the documentation of the chip & the driver source 
> > quickly revealed
> > > that the volume can be controlled directly by two buttons, 
> > but the driver
> > > doesn't seem make use of that. 
> > > 
> > > Can anybody give me a hint how to use/enable the hardware 
> > volume control on
> > > that chip? Is a major rewrite of the driver required? Maybe 
> > some other
> > > driver could do that? The es1968 seems to support hw vol, 
> > might that driver
> > > run also on the ES1988?
> > 
> > The problem is -- we don't know.  We have no proper datasheet for this
> > chip...
> > 
> > 
> > Takashi
> 
> Hi,
> Sorry, don't understand:
> 
> the driver es1968.c enables and uses 
> 
> #define HWV_CONFB		0x0080
> w |= HWV_CONFB;		/* HWV on */
> pci_write_config_word(pci, ESM_CONFIG_B, w);
> 
> and handles the irq. The es1968.c driver handles the Maestro-2, does it?
> http://www.alsa-project.org/alsa/ftp/manuals/ess/DSMaestro2.pdf
> 
> Same registers as described in the datasheet for the
> ES1988/Allegro/Maestro-3
> http://www.alsa-project.org/alsa/ftp/manuals/ess/ds1988.pdf
> 
> What info is missing? 

The registers above didn't work at the last time we tried.
Feel free to debug it :)


Takashi


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