linux-kernel - Re: [PATCH v2 07/11] HID: hid-multitouch: move ALWAYS

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Date:	Mon, 29 Oct 2012 23:16:05 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/11] HID: hid-multitouch: move ALWAYS_VALID quirk
 check

Hi Benjamin,

> Win 8 device specification changed the requirements for the hid usages
> of the multitouch devices. Now InRange is optional and must be only
> used when the device supports hovering.
> 
> This ensures that the quirk ALWAYS_VALID is taken into account and
> also ensures its precedence over the other VALID* quirks.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> ---
>  drivers/hid/hid-multitouch.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Since we seem to never actually reset td, this seems equivalent,
unless some device added ALWAYS VALID by mistake, even if INRANGE is
not part of the report descriptor.

> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 000c979..43bd8e8 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -506,7 +506,7 @@ static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
>   */
>  static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
>  {
> -	if (td->curvalid) {
> +	if (td->curvalid || td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID) {

I found at least one presence of this construct in the kernel, but I
think the overwhelming majority use parenthesis.

>  		int slotnum = mt_compute_slot(td, input);
>  		struct mt_slot *s = &td->curdata;
>  
> @@ -561,9 +561,7 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
>  	if (hid->claimed & HID_CLAIMED_INPUT) {
>  		switch (usage->hid) {
>  		case HID_DG_INRANGE:
> -			if (quirks & MT_QUIRK_ALWAYS_VALID)
> -				td->curvalid = true;
> -			else if (quirks & MT_QUIRK_VALID_IS_INRANGE)
> +			if (quirks & MT_QUIRK_VALID_IS_INRANGE)
>  				td->curvalid = value;
>  			break;
>  		case HID_DG_TIPSWITCH:
> -- 
> 1.7.11.7
> 

Thanks,
Henrik
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