linux-kernel - Re: [Xen-devel] [PATCH v3] xen, input: try to read screen resolution for xen-kbdfront

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Date:   Tue, 14 Feb 2017 10:00:06 +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 v3] xen, input: try to read screen resolution
 for xen-kbdfront

Ping as I am also interested in modifying kbdfront...

On 02/09/2017 03:45 PM, Juergen Gross wrote:
> On 30/01/17 16:10, 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>
> Ping?
>
>> ---
>> V3: add case of late framebuffer registration (Oleksandr Andrushchenko)
>> V2: get framebuffer resolution only if CONFIG_FB (Dmitry Torokhov)
>> ---
>>   drivers/input/misc/xen-kbdfront.c | 46 ++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 43 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
>> index 3900875..9a20800 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>
>>   
>> @@ -39,6 +40,9 @@ struct xenkbd_info {
>>   	int irq;
>>   	struct xenbus_device *xbdev;
>>   	char phys[32];
>> +#ifdef CONFIG_FB_NOTIFY
>> +	struct notifier_block nb;
>> +#endif
>>   };
>>   
>>   static int xenkbd_remove(struct xenbus_device *);
>> @@ -105,10 +109,29 @@ static irqreturn_t input_handler(int rq, void *dev_id)
>>   	return IRQ_HANDLED;
>>   }
>>   
>> +#ifdef CONFIG_FB
>> +#ifdef CONFIG_FB_NOTIFY
>> +static int xenkbd_fb_event(struct notifier_block *self,
>> +			   unsigned long action, void *data)
>> +{
>> +	struct xenkbd_info *info = container_of(self, struct xenkbd_info, nb);
>> +	struct fb_info *fb = registered_fb[0];
>> +
>> +	if (action != FB_EVENT_FB_REGISTERED || !fb)
>> +		return 0;
>> +
>> +	input_set_abs_params(info->ptr, ABS_X, 0, fb->var.xres_virtual, 0, 0);
>> +	input_set_abs_params(info->ptr, ABS_Y, 0, fb->var.yres_virtual, 0, 0);
>> +
>> +	return 0;
>> +}
>> +#endif
>> +#endif
>> +
>>   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 +196,22 @@ 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]) {
>> +			width = registered_fb[0]->var.xres_virtual;
>> +			height = registered_fb[0]->var.yres_virtual;
>> +		} else {
>> +#ifdef CONFIG_FB_NOTIFY
>> +			info->nb.notifier_call = xenkbd_fb_event;
>> +			fb_register_client(&info->nb);
>> +#endif
>> +		}
>> +#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);
>> @@ -222,6 +258,10 @@ static int xenkbd_remove(struct xenbus_device *dev)
>>   	struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
>>   
>>   	xenkbd_disconnect_backend(info);
>> +#ifdef CONFIG_FB_NOTIFY
>> +	if (info->nb.notifier_call)
>> +		fb_unregister_client(&info->nb);
>> +#endif
>>   	if (info->kbd)
>>   		input_unregister_device(info->kbd);
>>   	if (info->ptr)
>>
>
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