snd_hwdep_open() as non-root user

snd_hwdep_open() as non-root user

[Rafal Powierski]

Developers,
I would like to access pin verb hda interface using snd_hwdep_open() function.
It works fine if I run as root.
I hope there is a way to configure my kubuntu so I can do it as non-root user (e.g. debugging) 
so far, I have been trying changing access flags for devices in /dev/snd/ directory to crwxrwxrwx no plus character.
It did not change my privileges for snd_hwdep_open() -  still returns –13.
I assume that the device-file responsible is /dev/snd/hwC1D0, the same as parameter given to “hda-verb” program.
I am developing a new hardware, using HDA codec.
Please help
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Re: snd_hwdep_open() as non-root user

[Clemens Ladisch]

Rafal Powierski wrote:
> I would like to access pin verb hda interface using snd_hwdep_open() function.
> It works fine if I run as root.
> I hope there is a way to configure my kubuntu so I can do it as non-root user (e.g. debugging)
> so far, I have been trying changing access flags for devices in /dev/snd/ directory to crwxrwxrwx no plus character.
> It did not change my privileges for snd_hwdep_open() -  still returns –13.

sound/pci/hda/hda_hwdep.c says:

static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
#ifndef CONFIG_SND_DEBUG_VERBOSE
	if (!capable(CAP_SYS_RAWIO))
		return -EACCES;
#endif
	return 0;
}


Regards,
Clemens
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Re: snd_hwdep_open() as non-root user

[Rafal Powierski]

Thank you Clemens,
sudo setcap cap_sys_rawio... solves the problem :)
I only need to ad it to the qt build or to the app itself.
Best Regards,
Rafal


-----Original Message----- 
From: Clemens Ladisch
Sent: Thursday, October 04, 2012 2:50 PM
To: Rafal Powierski
Cc: alsa-devel@alsa-project.org
Subject: Re: [alsa-devel] snd_hwdep_open() as non-root user

Rafal Powierski wrote:
> I would like to access pin verb hda interface using snd_hwdep_open() 
> function.
> It works fine if I run as root.
> I hope there is a way to configure my kubuntu so I can do it as non-root 
> user (e.g. debugging)
> so far, I have been trying changing access flags for devices in /dev/snd/ 
> directory to crwxrwxrwx no plus character.
> It did not change my privileges for snd_hwdep_open() -  still returns –13.

sound/pci/hda/hda_hwdep.c says:

static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
#ifndef CONFIG_SND_DEBUG_VERBOSE
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
#endif
return 0;
}


Regards,
Clemens
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Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel 

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http://mailman.alsa-project.org/mailman/listinfo/alsa-devel