Re: [PATCH 00/11] ALSA: firewire-motu: add ioctl commands to retrieve information in messages delivered by isoc packet

[Takashi Iwai <tiwai@suse.de>]

On Fri, 15 Oct 2021 10:08:15 +0200,
Takashi Sakamoto wrote:
> 
> Hi,
> 
> The purpose of this patchset is to add message parser to ALSA
> firewire-motu driver so that userspace applications can read information
> in message delivered by isochronous packet as well as PCM frames.
> The message includes information about hardware meter and user action
> over hardware component such as knob, and MIDI message bytes.
> 
> Models in MOTU FireWire series can be categorized to 4 groups in regard
> of message mechanism:
> 
> Group 1. 828 and 896
>  * quadlet message to registered destination address
> Group 2. 828mk2, 896hd, Traveler, 8 pre, Ultralite, 4 pre, and Audio Express
>  * quadlet message to registered destination address
>  * message delivered by isochronous packet
> Group 3. 828mk3, 896mk3, Ultralite mk3, Traveler mk3, and Track 16
>  * quadlet message to registered destination address
>  * message delivered by isochronous packet
>  * block message to registered destination address, including command
> Group 4. V3HD/V4HD
>  * quadlet message to registered destination address
>  * block message to registered destination address
> 
> The patchset is for message delivered by isochronous packet in group 2
> and 3. In Group 2, the message includes information of hardware meter,
> information of user action over hardware component. The model in Group
> 2 is called as 'register DSP' in the patchset since parameters of DSP
> can be configured by asynchronous transaction for register access. In
> Group 3, the message includes information of hardware meter only. The
> model in Group 3 is called as 'command DSP' since software and device
> communicate with commands transferred by asynchronous transaction in
> regard of DSP parameters. Two types of message parser is going to be
> added so that the driver caches images for the information. The cache
> is available for userspace application by ioctl commands newly introduced.
> 
> I note that no control element is added for the hardware meters and user
> actions. It's expected for userspace application to retrieve and parse the
> information of image then operate for user-defined control element set.
> 
> Takashi Sakamoto (11):
>   ALSA: firewire-motu: add message parser to gather meter information in
>     register DSP model
>   ALSA: firewire-motu: add message parser for meter information in
>     command DSP model
>   ALSA: firewire-motu: add ioctl command to read cached hardware meter
>   ALSA: firewire-motu: parse messages for mixer source parameters in
>     register-DSP model
>   ALSA: firewire-motu: parse messages for mixer output parameters in
>     register DSP model
>   ALSA: firewire-motu: parse messages for output parameters in register
>     DSP model
>   ALSA: firewire-motu: parse messages for line input parameters in
>     register DSP model
>   ALSA: firewire-motu: parse messages for input parameters in register
>     DSP model
>   ALSA: firewire-motu: add ioctl command to read cached DSP parameters
>   ALSA: firewire-motu: queue event for parameter change in register DSP
>     model
>   ALSA: firewire-motu: notify event for parameter change in register DSP
>     model

Applied all patches now.  Thanks.


Takashi