* On mixer controls naming
@ 2014-01-09 15:27 R. Lemos
2014-01-13 11:12 ` Clemens Ladisch
0 siblings, 1 reply; 5+ messages in thread
From: R. Lemos @ 2014-01-09 15:27 UTC (permalink / raw)
To: alsa-devel
Hi,
I'm trying to write a new driver for a virtual sound card. It isn't
actually a sound card, but only a software solution to control volume
and bass of an external device (using SPI and GPIO). So it only has a
mixer (no pcm or capture subdevices).
I could successfully configure two controls "Master Playback Switch"
and "Master Playback Volume". Alsamixer shows them correctly under
"Playback" view (and very nicely it joined them together to form a
single composite control "Master")
The other control I've named "Tone Control - Bass", as indicated in
writing-an-alsa-driver.pdf. But alsamixer shows it under both
"Playback" and "Capture" views.
How can I restrict this latter control to just playback?
--
[]'s
Rodrigo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: On mixer controls naming
2014-01-09 15:27 On mixer controls naming R. Lemos
@ 2014-01-13 11:12 ` Clemens Ladisch
2014-01-13 16:56 ` R. Lemos
0 siblings, 1 reply; 5+ messages in thread
From: Clemens Ladisch @ 2014-01-13 11:12 UTC (permalink / raw)
To: R. Lemos, alsa-devel
R. Lemos wrote:
> The other control I've named "Tone Control - Bass", as indicated in
> writing-an-alsa-driver.pdf. But alsamixer shows it under both
> "Playback" and "Capture" views.
>
> How can I restrict this latter control to just playback?
For a control to be classified as a playback control, its name must
have one of the suffixes " Playback Enum", " Playback Switch",
" Playback Route", or " Playback Volume".
Regards,
Clemens
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: On mixer controls naming
2014-01-13 11:12 ` Clemens Ladisch
@ 2014-01-13 16:56 ` R. Lemos
2014-01-13 18:49 ` Clemens Ladisch
0 siblings, 1 reply; 5+ messages in thread
From: R. Lemos @ 2014-01-13 16:56 UTC (permalink / raw)
To: Clemens Ladisch; +Cc: alsa-devel
Unfortunately it doesn't work for Tone Control.
I've tried the following (after each alternative is the output of amixer):
===== "Master Playback Bass" =====
Simple mixer control 'Master Playback Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Master Playback Tone" =====
Simple mixer control 'Master Playback Tone',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Playback Tone - Bass" =====
Simple mixer control 'Playback Tone - Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Playback Tone Control - Bass" =====
Simple mixer control 'Playback Tone Control - Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Playback Tone Control" =====
Simple mixer control 'Playback Tone Control',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Tone Control - Bass" =====
Simple mixer control 'Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 123 [48%]
===== "Tone Control Playback - Bass" =====
Simple mixer control 'Tone Control Playback - Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
===== "Tone Playback Control - Bass" =====
Simple mixer control 'Tone Playback Control - Bass',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 255
Mono: 0 [0%]
In each tested alternative capture channel shows up as mono (instead
of the expected behavior of showing nothing at all, as below). Each
control label also reverted to the full control name. Personally I
prefer the "Tone Control - Bass" alternative, which neatly shows up as
just "Bass". It would be perfect, were not the availability of a
capture channel for this control.
Note: previous amixer output elided to remove the the following common
working part for the "Master Playback Volume" and "Master Playback
Switch":
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 255
Mono: Playback 194 [76%] [on]
On Mon, Jan 13, 2014 at 9:12 AM, Clemens Ladisch <clemens@ladisch.de> wrote:
> R. Lemos wrote:
>> The other control I've named "Tone Control - Bass", as indicated in
>> writing-an-alsa-driver.pdf. But alsamixer shows it under both
>> "Playback" and "Capture" views.
>>
>> How can I restrict this latter control to just playback?
>
> For a control to be classified as a playback control, its name must
> have one of the suffixes " Playback Enum", " Playback Switch",
> " Playback Route", or " Playback Volume".
>
>
> Regards,
> Clemens
--
[]'s
Rodrigo
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* Re: On mixer controls naming
2014-01-13 16:56 ` R. Lemos
@ 2014-01-13 18:49 ` Clemens Ladisch
2014-01-14 0:31 ` R. Lemos
0 siblings, 1 reply; 5+ messages in thread
From: Clemens Ladisch @ 2014-01-13 18:49 UTC (permalink / raw)
To: R. Lemos; +Cc: alsa-devel
R. Lemos wrote:
> On Mon, Jan 13, 2014 at 9:12 AM, Clemens Ladisch <clemens@ladisch.de> wrote:
>> For a control to be classified as a playback control, its name must
>> have one of the suffixes " Playback Enum", " Playback Switch",
>> " Playback Route", or " Playback Volume".
>
> Unfortunately it doesn't work for Tone Control.
>
> Simple mixer control 'Master Playback Bass',0
> Simple mixer control 'Master Playback Tone',0
> Simple mixer control 'Playback Tone - Bass',0
> Simple mixer control 'Playback Tone Control - Bass',0
> ...
"Suffix" means "at the end". Try "Tone Control Bass Playback Volume".
Regards,
Clemens
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: On mixer controls naming
2014-01-13 18:49 ` Clemens Ladisch
@ 2014-01-14 0:31 ` R. Lemos
0 siblings, 0 replies; 5+ messages in thread
From: R. Lemos @ 2014-01-14 0:31 UTC (permalink / raw)
To: Clemens Ladisch; +Cc: alsa-devel
I'll stick to "Bass Playback Volume" (shows up as "Bass", only
playback channel).
Thank you for your support.
On Mon, Jan 13, 2014 at 4:49 PM, Clemens Ladisch <clemens@ladisch.de> wrote:
> R. Lemos wrote:
>> On Mon, Jan 13, 2014 at 9:12 AM, Clemens Ladisch <clemens@ladisch.de> wrote:
>>> For a control to be classified as a playback control, its name must
>>> have one of the suffixes " Playback Enum", " Playback Switch",
>>> " Playback Route", or " Playback Volume".
>>
>> Unfortunately it doesn't work for Tone Control.
>>
>> Simple mixer control 'Master Playback Bass',0
>> Simple mixer control 'Master Playback Tone',0
>> Simple mixer control 'Playback Tone - Bass',0
>> Simple mixer control 'Playback Tone Control - Bass',0
>> ...
>
> "Suffix" means "at the end". Try "Tone Control Bass Playback Volume".
>
>
> Regards,
> Clemens
--
[]'s
Rodrigo
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2014-01-09 15:27 On mixer controls naming R. Lemos
2014-01-13 11:12 ` Clemens Ladisch
2014-01-13 16:56 ` R. Lemos
2014-01-13 18:49 ` Clemens Ladisch
2014-01-14 0:31 ` R. Lemos
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