[Xen-devel] [PATCH 2/5] xen pvfb: Pointer z-axis (mouse wheel) support

[Markus Armbruster <armbru@xxxxxxxxxx>]

Add z-axis motion to pointer events.  Backward compatible, because
there's space for the z-axis in union xenkbd_in_event, and old
backends zero it.

Derived from
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/57dfe0098000
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/1edfea26a2a9
http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/c3ff0b26f664

Signed-off-by: Pat Campbell <plc@xxxxxxxxxx>
Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>
---
 drivers/input/xen-kbdfront.c     |    8 +++++++-
 include/xen/interface/io/kbdif.h |    2 ++
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
index 0f47f46..9da4452 100644
--- a/drivers/input/xen-kbdfront.c
+++ b/drivers/input/xen-kbdfront.c
@@ -66,6 +66,9 @@ static irqreturn_t input_handler(int rq, void *dev_id)
                case XENKBD_TYPE_MOTION:
                        input_report_rel(dev, REL_X, event->motion.rel_x);
                        input_report_rel(dev, REL_Y, event->motion.rel_y);
+                       if (event->motion.rel_z)
+                               input_report_rel(dev, REL_WHEEL,
+                                                -event->motion.rel_z);
                        break;
                case XENKBD_TYPE_KEY:
                        dev = NULL;
@@ -84,6 +87,9 @@ static irqreturn_t input_handler(int rq, void *dev_id)
                case XENKBD_TYPE_POS:
                        input_report_abs(dev, ABS_X, event->pos.abs_x);
                        input_report_abs(dev, ABS_Y, event->pos.abs_y);
+                       if (event->pos.rel_z)
+                               input_report_rel(dev, REL_WHEEL,
+                                                -event->pos.rel_z);
                        break;
                }
                if (dev)
@@ -152,7 +158,7 @@ static int __devinit xenkbd_probe(struct xenbus_device *dev,
        ptr->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS);
        for (i = BTN_LEFT; i <= BTN_TASK; i++)
                set_bit(i, ptr->keybit);
-       ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y);
+       ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL);
        input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
        input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
 
diff --git a/include/xen/interface/io/kbdif.h b/include/xen/interface/io/kbdif.h
index fb97f42..8066c78 100644
--- a/include/xen/interface/io/kbdif.h
+++ b/include/xen/interface/io/kbdif.h
@@ -49,6 +49,7 @@ struct xenkbd_motion {
        uint8_t type;           /* XENKBD_TYPE_MOTION */
        int32_t rel_x;          /* relative X motion */
        int32_t rel_y;          /* relative Y motion */
+       int32_t rel_z;          /* relative Z motion (wheel) */
 };
 
 struct xenkbd_key {
@@ -61,6 +62,7 @@ struct xenkbd_position {
        uint8_t type;           /* XENKBD_TYPE_POS */
        int32_t abs_x;          /* absolute X position (in FB pixels) */
        int32_t abs_y;          /* absolute Y position (in FB pixels) */
+       int32_t rel_z;          /* relative Z motion (wheel) */
 };
 
 #define XENKBD_IN_EVENT_SIZE 40
-- 
1.5.3.3


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