linux-kernel - Re: [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver

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Date:	Thu, 21 Dec 2006 14:08:45 +0100
From:	Nicolas Ferre <nicolas.ferre@....atmel.com>
To:	David Brownell <david-b@...bell.net>
CC:	Patrice Vilchez <patrice.vilchez@....atmel.com>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver

David Brownell a écrit :
> On Friday 15 December 2006 7:20 am, Nicolas FERRE wrote:
>> Add support for the ads7843 touchscreen controller to the ads7846 driver code.
> 
> Glad to see this!  Is this for AT91sam9261-EK board support, maybe?

Indeed ! An also for the AT91sam9263-EK which has the same touchscreen chip.

> Let me try to sort out the mess with those updates, and ask you to refresh
> this ads7843 support against that more-current ads7846 code.

Ok, let me know when you have a newer code. I will try to adapt my
ads7843 support then.

>> As the SPI underlying code behaves quite differently from a controller driver
>> to another whan not having a tx_buf filled, I have add a zerroed buffer to give
>> to the spi layer while receiving data.
> 
> You must be working with a buggy controller driver then.  That part of
> this patch should never be needed.  It's expected that rx-only transfers
> will omit a tx buf; all controller drivers must handle that case.

I said that because it is true that most of spi controller drivers 
manage rx only transactions filling the tx buffer with zerros but the 
spi_s3c24xx.c driver seems to fill with ones (line 177 hw_txbyte())

Anyway, I will check in our controller driver to sort this out.

Regards,
-- 
Nicolas Ferre



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