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SubjectRe: [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@gmail.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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