linux-kernel - Re: [PATCH 3/6] hid: egalax: Correct for device resolution report error

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Date:	Wed, 13 Oct 2010 22:13:37 +0200
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Henrik Rydberg <rydberg@...omail.se>
CC:	Jiri Kosina <jkosina@...e.cz>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Philipp Merkel <mail@...lmerk.de>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] hid: egalax: Correct for device resolution report
 error

On 10/13/2010 03:58 PM, Henrik Rydberg wrote:

> The firmware of both supported devices report a X/Y maximum of 4096,
> whereas in reality, it is eight times larger. Fixed with this patch.
> 
> Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
> ---
>  drivers/hid/hid-egalax.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c
> index 23f832b..3b490a3 100644
> --- a/drivers/hid/hid-egalax.c
> +++ b/drivers/hid/hid-egalax.c
> @@ -56,6 +56,7 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>  	case HID_UP_GENDESK:
>  		switch (usage->hid) {
>  		case HID_GD_X:
> +			field->logical_maximum <<= 3;


This makes the logical maximum increase by a factor of eight every time the
module is loaded.

>  			hid_map_usage(hi, usage, bit, max,
>  					EV_ABS, ABS_MT_POSITION_X);
>  			set_abs(input, ABS_MT_POSITION_X, field, 0);
> @@ -63,6 +64,7 @@ static int egalax_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>  			set_abs(input, ABS_X, field, 0);
>  			return 1;
>  		case HID_GD_Y:
> +			field->logical_maximum <<= 3;


Same here.

>  			hid_map_usage(hi, usage, bit, max,
>  					EV_ABS, ABS_MT_POSITION_Y);
>  			set_abs(input, ABS_MT_POSITION_Y, field, 0);


Will send new revisions of patches 3 and 5...

Henrik
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