linux-kernel - Re: [PATCH v2 02/30] HID: wacom: store the type in wacom->shared for INTUOSHT and INTUOSHT2

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Date:	Thu, 14 Jul 2016 21:14:09 -0700
From:	Ping Cheng <pinglinux@...il.com>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Jason Gerecke <killertofu@...il.com>,
	Aaron Skomra <skomra@...il.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-input <linux-input@...r.kernel.org>
Subject: Re: [PATCH v2 02/30] HID: wacom: store the type in wacom->shared for
 INTUOSHT and INTUOSHT2

On Wed, Jul 13, 2016 at 9:05 AM, Benjamin Tissoires
<benjamin.tissoires@...hat.com> wrote:
> The type is never set but we check for it in wacom_wireless_irq().

Type was assigned in wacom_wireless_work [1] before we moved code
around. It somehow failed to get into wacom_parse_and_register. The
value was only assigned once on stylus interface. It was unnecessary
to assign it again on touch interface since it is a shared value.
Maybe that was the reason it missed its "flight"?

[1] https://git.kernel.org/cgit/linux/kernel/git/dtor/input.git/commit/drivers/hid/wacom_sys.c?id=2546dacd3e0e48c40bbb99caf01455f1ade9bb24

> It looks like this is a big hack from the beginning, so fill in the gap
> only.

Yeah, wireless is a dynamic connection. We can not tell which tablet
model is going to be connected before it is paired. But, the dongle is
always the same. That's the tricky part.

> Untested.

Aaron tested it. So, your code is safe ;).

> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

The whole set is

Acked-by: Ping Cheng <pingc@...om.com>

Thanks for your effort!

Ping

> ---
>
> No changes in v2
> ---
>  drivers/hid/wacom_sys.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
> index 499cc82..9e283aa 100644
> --- a/drivers/hid/wacom_sys.c
> +++ b/drivers/hid/wacom_sys.c
> @@ -1720,9 +1720,10 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
>                 error = hid_hw_open(hdev);
>
>         if ((wacom_wac->features.type == INTUOSHT ||
> -           wacom_wac->features.type == INTUOSHT2) &&
> +            wacom_wac->features.type == INTUOSHT2) &&
>             (wacom_wac->features.device_type & WACOM_DEVICETYPE_TOUCH)) {
> -                       wacom_wac->shared->touch_input = wacom_wac->touch_input;
> +               wacom_wac->shared->type = wacom_wac->features.type;
> +               wacom_wac->shared->touch_input = wacom_wac->touch_input;
>         }
>
>         return 0;
> --
> 2.5.5
>