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

[Juergen Gross <jgross@xxxxxxxx>]

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@xxxxxxxx>
---
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)
-- 
2.10.2


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