[alsa-devel] [PATCH] Mixer quirk for QuickCam E 3500

[Takashi Iwai]

At Tue, 21 Jul 2009 23:10:42 +0200,
Alexey Fisher wrote:
> 
> 1. E3500 report cval->max more than it actually can handel, so if you
> set 95% capture level it will be muted.
> 2. betwen cval->min and cval-max(real) is 2940 control units,
> but real are only 7.
> 3. we found only 7 real control units, with cval->res = 384,
> but alsa can't handel less than 10 controls, so make it more
> and set cval->res = 192.
> 
> Signed-off-by: Alexey Fisher <bug-track at fisher-privat.net>

Thanks for the patch.  The added code looks almost good.
But, it's better to put your code into another place, e.g. a bit
later so that you don't insert it between the comment and the other
code.  Also, if you use switch(), you need break.

In your case, simply put a new if () block with a proper comment
after that switch() block.  It's not necessarily merged into a single
switch.  The compiler should be clever enough.

Also, try to keep the patch checkpatch.pl-clean.  Run it once before
submitting your patch.

Could you fix these and repost?


thanks,

Takashi

> ---
>  sound/usb/usbmixer.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
> index 4bd3a7a..72562ee 100644
> --- a/sound/usb/usbmixer.c
> +++ b/sound/usb/usbmixer.c
> @@ -995,6 +995,13 @@ static void build_feature_ctl(struct mixer_build *state, unsigned char *desc,
>  	/* is not very clear from datasheets */
>  	/* I hope that the min value is -15360 for newer firmware --jk */
>  	switch (state->chip->usb_id) {
> +	case USB_ID(0x046d, 0x09a4):
> +		if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
> +			snd_printk(KERN_INFO "using volume control quirk for the QuickCam E3500\n");
> +			cval->min = 6080;
> +			cval->max = 8768;
> +			cval->res = 192;
> +		}
>  	case USB_ID(0x0471, 0x0101):
>  	case USB_ID(0x0471, 0x0104):
>  	case USB_ID(0x0471, 0x0105):
> -- 
> 1.6.3.3
> 
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