linux-kernel - Re: [PATCH] firmware_class: Add firmware filename overrides

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Message-ID: <20150304235709.GA27233@kroah.com>
Date:	Wed, 4 Mar 2015 15:57:09 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Charlie Mooney <charliemooney@...omium.org>
Cc:	linux-kernel@...r.kernel.org, dtor@...omium.org,
	ming.lei@...onical.com
Subject: Re: [PATCH] firmware_class: Add firmware filename overrides

On Wed, Mar 04, 2015 at 03:25:10PM -0800, Charlie Mooney wrote:
> This patch adds an additional feature to the firmware_class.c module.
> To allow a unified method of specifying new firmware locations when
> drivers request a firmware binary to update their devices with, we
> have added the concept of a "fw override"
> 
> A fw override is a rule that matches firmware requests based on the
> name of the device requesting the fw and what the filename for the
> fw they are requesting is, and overrides their requests with a new
> value.
> 
> Overrides are set up by piping a description of the override into
> an attribute set up at /sys/class/firmware/fw_override.  The string
> should be a null-deliminited list of the firmware name you want to
> over ride, the new name to replace it with, and the device name that
> you want the override to apply to.   For example you could set up
> an override for a device called "my_device" so that any time it
> requests a firmware called "my_fw.bin" it instead gets "new_fw.bin"
> with the following command:
> 
> echo -e 'my_fw.bin\0new_fw.bin\0my_device\0' >
> 				/sys/class/firmware/fw_override

I hate to ask, but I have to, why do you need this?

Also, this needs to be documented somewhere, Documentation/ABI/ please?

thanks,

greg k-h
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