linux-kernel - Re: [PATCH v15 09/12] input: cyapa: add gen5 trackpad device firmware update function support

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Date:	Tue, 16 Dec 2014 12:24:37 -0800
From:	Benson Leung <bleung@...gle.com>
To:	Jeremiah Mahler <jmmahler@...il.com>,
	Dudley Du <dudley.dulixin@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Benson Leung <bleung@...gle.com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v15 09/12] input: cyapa: add gen5 trackpad device firmware
 update function support

On Tue, Dec 16, 2014 at 5:56 AM, Jeremiah Mahler <jmmahler@...il.com> wrote:
> On Mon, Dec 15, 2014 at 02:23:20PM +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      |   1 +
>>  drivers/input/mouse/cyapa_gen5.c | 292 ++++++++++++++++++++++++++++++++++++++-
>>  2 files changed, 292 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
>> index d8b46b0..728490e 100644
>> --- a/drivers/input/mouse/Kconfig
>> +++ b/drivers/input/mouse/Kconfig
>> @@ -206,6 +206,7 @@ config MOUSE_BCM5974
>>  config MOUSE_CYAPA
>>       tristate "Cypress APA I2C Trackpad support"
>>       depends on I2C
>> +     select CRC_ITU_T
>>       help
>
> Just found out that if I2C_DESIGNWARE_PCI isn't enabled the touchpad
> won't work.  Verify this on your machines.  Then perhaps add a depends
> for I2C_DESIGNWARE_PCI instead of I2C since it would include the former.

This isn't strictly true on all devices, though. This is true on
DESIGNWARE_PCI based devices like the Acer C720 and the HP Chromebook
14, but on other platforms that use Cypress trackpads, such as ARM
platforms like the Samsung Chromebook Series 3 DESIGNWARE_PCI is not
required, and will just result in a driver that's never used being
built.

The specific I2C bus that's being used here shouldn't matter here...
that's more of a platform issue. In the case with Chromebooks, it
might make sense to change drivers/platform/chrome/Kconfig so that
CHROMEOS_LAPTOP depends on I2C_DESIGNWARE_PCI, maybe.

-- 
Benson Leung
Software Engineer, Chrome OS
Google Inc.
bleung@...gle.com
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