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From: Nicolas Ferre <>
To: David Brownell <>
Cc: Patrice Vilchez <>,
	Linux Kernel list <>
Subject: Re: [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver
Date: Thu, 21 Dec 2006 14:08:45 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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.

Nicolas Ferre

  reply	other threads:[~2006-12-21 13:10 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2006-12-20 23:13 ` David Brownell
2006-12-21 13:08   ` Nicolas Ferre [this message]
2006-12-21 14:40     ` Nicolas Ferre
2006-12-22 20:05       ` David Brownell
2006-12-22 19:31     ` David Brownell
2006-12-22 20:14       ` Dmitry Torokhov
2006-12-22 19:25 [patch 2.6.20-rc1 6/6] input: ads7846 directly senses PENUP state David Brownell
2006-12-28 22:37 ` David Brownell
2006-12-29  6:22   ` Dmitry Torokhov
2006-12-29 20:26     ` David Brownell
2007-02-16 17:37       ` [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver Nicolas Ferre
2007-02-16 19:08         ` David Brownell
2007-02-19 12:48           ` Nicolas Ferre
2007-02-19 18:46             ` David Brownell
2007-02-20  9:19               ` Nicolas Ferre
2007-03-01  4:49                 ` Dmitry Torokhov
  -- strict thread matches above, loose matches on Subject: below --
2006-12-15 14:45 Nicolas FERRE
2006-12-20 22:03 ` Andrew Morton
2006-12-21  9:57   ` Nicolas Ferre

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