[PATCH] xen,input: try to read screen resolution for xen-kbdfront

[PATCH] xen,input: try to read screen resolution for xen-kbdfront

[Juergen Gross]

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.

Cc: stable@vger.kernel.org
Signed-off-by: Juergen Gross <jgross@suse.com>
---
 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..0032c81 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>
 
@@ -108,10 +109,11 @@ 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;
+	struct fb_info *fb0;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
@@ -173,9 +175,16 @@ static int xenkbd_probe(struct xenbus_device *dev,
 	ptr->id.product = 0xfffe;
 
 	if (abs) {
+		width = XENFB_WIDTH;
+		height = XENFB_HEIGHT;
+		fb0 = registered_fb[0];
+		if (fb0) {
+			width = fb0->var.xres_virtual;
+			height = fb0->var.yres_virtual;
+		}
 		__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);
-- 
2.10.2

Re: [PATCH] xen,input: try to read screen resolution for xen-kbdfront

[Dmitry Torokhov]

On Tue, Jan 24, 2017 at 01:09:55PM +0100, 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.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
>  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..0032c81 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>
>  
> @@ -108,10 +109,11 @@ 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;
> +	struct fb_info *fb0;
>  
>  	info = kzalloc(sizeof(*info), GFP_KERNEL);
>  	if (!info) {
> @@ -173,9 +175,16 @@ static int xenkbd_probe(struct xenbus_device *dev,
>  	ptr->id.product = 0xfffe;
>  
>  	if (abs) {
> +		width = XENFB_WIDTH;
> +		height = XENFB_HEIGHT;
> +		fb0 = registered_fb[0];

This will break if !CONFIG_FBi I think. While i see that xen.config has
it on I wonder if it is still possible to turn it off (either randconfig
or intentionally).

Thanks.

-- 
Dmitry

Re: [PATCH] xen,input: try to read screen resolution for xen-kbdfront

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 932 bytes --]

Hi Juergen,

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.10-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Juergen-Gross/xen-input-try-to-read-screen-resolution-for-xen-kbdfront/20170125-010022
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: x86_64-randconfig-h0-01250255 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `xenkbd_probe':
>> xen-kbdfront.c:(.text+0x3dc506): undefined reference to `registered_fb'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 24684 bytes --]

Re: [PATCH] xen,input: try to read screen resolution for xen-kbdfront

[Juergen Gross]

On 24/01/17 19:47, Dmitry Torokhov wrote:
> On Tue, Jan 24, 2017 at 01:09:55PM +0100, 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.
>>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>>  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..0032c81 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>
>>  
>> @@ -108,10 +109,11 @@ 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;
>> +	struct fb_info *fb0;
>>  
>>  	info = kzalloc(sizeof(*info), GFP_KERNEL);
>>  	if (!info) {
>> @@ -173,9 +175,16 @@ static int xenkbd_probe(struct xenbus_device *dev,
>>  	ptr->id.product = 0xfffe;
>>  
>>  	if (abs) {
>> +		width = XENFB_WIDTH;
>> +		height = XENFB_HEIGHT;
>> +		fb0 = registered_fb[0];
> 
> This will break if !CONFIG_FBi I think. While i see that xen.config has
> it on I wonder if it is still possible to turn it off (either randconfig
> or intentionally).

kbuild robot says it is. :-(

Sending V2.


Thanks,

Juergen