linux-kernel - Re: [PATCH v13 09/12] input: cyapa: add gen5 trackpad device firmware update function support

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Date:	Tue, 9 Dec 2014 19:33:03 -0800
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Dudley Du <dudley.dulixin@...il.com>
Cc:	dmitry.torokhov@...il.com, rydberg@...omail.se, bleung@...gle.com,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v13 09/12] input: cyapa: add gen5 trackpad device
 firmware update function support

Dudley,

On Tue, Dec 09, 2014 at 05:11:41PM +0800, Dudley Du wrote:
> Add firmware image update function supported for gen5 trackpad device,
> it can be used through sysfs update_fw interface.
> TEST=test on Chromebooks.
> 
> Signed-off-by: Dudley Du <dudley.dulixin@...il.com>
> ---
>  drivers/input/mouse/Kconfig      |   2 +-
>  drivers/input/mouse/cyapa_gen5.c | 290 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 291 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
> index d8b46b0..63e8b40 100644
> --- a/drivers/input/mouse/Kconfig
> +++ b/drivers/input/mouse/Kconfig
> @@ -205,7 +205,7 @@ config MOUSE_BCM5974
>  
>  config MOUSE_CYAPA
>  	tristate "Cypress APA I2C Trackpad support"
> -	depends on I2C
> +	depends on I2C && CRC_ITU_T
>  	help
>  	  This driver adds support for Cypress All Points Addressable (APA)
>  	  I2C Trackpads, including the ones used in 2012 Samsung Chromebooks.
> diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c

My initial config had MOUSE_CYAPA=m and CRC_ITU_T=n.
I did a 'make oldconfig', no questions were asked, but it removed
MOUSE_CYAPA since CRC_ITU_T wasn't enabled.  Since the cyapa modules
were removed the touchpad no longer works.  Not a very good upgrade path :-(
To fix this I have to manually enable MOUSE_CYAPA and CRC_ITU_T to get
it working again.

[...]

-- 
- Jeremiah Mahler
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