[alsa-devel] snd_hwdep_open() as non-root user
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
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
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 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (2)
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Clemens Ladisch -
Rafal Powierski