Re: USB mini-summit at LinuxCon Vancouver

From: Alan Stern
Date: Tue Aug 09 2011 - 10:19:30 EST

On Tue, 9 Aug 2011, Hans de Goede wrote:

> I would really like to see the dual mode camera and TV tuner discussion
> separated. They are 2 different issues AFAIK.
> 1) Dual mode cameras:
> In the case of the dual mode camera we have 1 single device (both at
> the hardware level and at the logical block level), which can do 2 things,
> but not at the same time. It can stream live video data from a sensor,
> or it can retrieve earlier taken pictures from some picture memory.
> Unfortunately even though these 2 functions live in a single logical block,
> historically we've developed 2 drivers for them. This leads to fighting
> over device ownership (surprise surprise), and to me the solution is
> very clear, 1 logical block == 1 driver.

According to Theodore, we have developed 5 drivers for them because the
stillcam modes in different devices use four different vendor-specific
drivers. Does it really make sense to combine 5 drivers into one? I
think some sort of sharing protocol would work out better.

Alan Stern

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