linux-kernel - Re: [Xen-devel] [PATCH v2] xen, input: try to read screen resolution for xen-kbdfront

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Date:   Fri, 27 Jan 2017 09:21:50 +0200
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     dmitry.torokhov@...il.com
Subject: Re: [Xen-devel] [PATCH v2] xen, input: try to read screen resolution
 for xen-kbdfront

On 01/27/2017 09:12 AM, Juergen Gross wrote:
> Instead of using the default resolution of 800*600 for the pointing
> device of xen-kbdfront try to read the resolution of the (virtual)
> framebuffer device. Use the default as fallback only.
>
> Signed-off-by: Juergen Gross <jgross@...e.com>
> ---
> V2: get framebuffer resolution only if CONFIG_FB (Dmitry Torokhov)
> ---
>   drivers/input/misc/xen-kbdfront.c | 15 ++++++++++++---
>   1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
> index 3900875..3aae9b4 100644
> --- a/drivers/input/misc/xen-kbdfront.c
> +++ b/drivers/input/misc/xen-kbdfront.c
> @@ -16,6 +16,7 @@
>   #include <linux/kernel.h>
>   #include <linux/errno.h>
>   #include <linux/module.h>
> +#include <linux/fb.h>
>   #include <linux/input.h>
>   #include <linux/slab.h>
>   
> @@ -108,7 +109,7 @@ static irqreturn_t input_handler(int rq, void *dev_id)
>   static int xenkbd_probe(struct xenbus_device *dev,
>   				  const struct xenbus_device_id *id)
>   {
> -	int ret, i;
> +	int ret, i, width, height;
>   	unsigned int abs;
>   	struct xenkbd_info *info;
>   	struct input_dev *kbd, *ptr;
> @@ -173,9 +174,17 @@ static int xenkbd_probe(struct xenbus_device *dev,
>   	ptr->id.product = 0xfffe;
>   
>   	if (abs) {
> +		width = XENFB_WIDTH;
> +		height = XENFB_HEIGHT;
> +#ifdef CONFIG_FB
> +		if (registered_fb[0]) {
This still will not help if FB gets registered after kbd+ptr
> +			width = registered_fb[0]->var.xres_virtual;
> +			height = registered_fb[0]->var.yres_virtual;
> +		}
> +#endif
>   		__set_bit(EV_ABS, ptr->evbit);
> -		input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
> -		input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
> +		input_set_abs_params(ptr, ABS_X, 0, width, 0, 0);
> +		input_set_abs_params(ptr, ABS_Y, 0, height, 0, 0);
>   	} else {
>   		input_set_capability(ptr, EV_REL, REL_X);
>   		input_set_capability(ptr, EV_REL, REL_Y);