Add a parameter for setting the resolution of xen-kbdfront in order to
be able to cope with a (virtual) frame buffer of arbitrary resolution.
While at it remove the pointless second reading of parameters from
Xenstore in the device connection phase: all parameters are available
during device probing already and that is where they should be read.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V3: - merged the two patches
- read Xenstore parameters during probing of the device only
---
drivers/input/misc/xen-kbdfront.c | 39 ++++++++++++++-------------------------
1 file changed, 14 insertions(+), 25 deletions(-)
diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 3900875dec10..2fc7895373ab 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -41,6 +41,12 @@ struct xenkbd_info {
char phys[32];
};
+enum { KPARAM_X, KPARAM_Y, KPARAM_CNT };
+static int ptr_size[KPARAM_CNT] = { XENFB_WIDTH, XENFB_HEIGHT };
+module_param_array(ptr_size, int, NULL, 0444);
+MODULE_PARM_DESC(ptr_size,
+ "Pointing device width, height in pixels (default 800,600)");
+
static int xenkbd_remove(struct xenbus_device *);
static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
static void xenkbd_disconnect_backend(struct xenkbd_info *);
@@ -128,7 +134,12 @@ static int xenkbd_probe(struct xenbus_device *dev,
if (!info->page)
goto error_nomem;
+ /* Set input abs params to match backend screen res */
abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0);
+ ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend, "width",
+ ptr_size[KPARAM_X]);
+ ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend, "height",
+ ptr_size[KPARAM_Y]);
if (abs) {
ret = xenbus_write(XBT_NIL, dev->nodename,
"request-abs-pointer", "1");
@@ -174,8 +185,8 @@ static int xenkbd_probe(struct xenbus_device *dev,
if (abs) {
__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, ptr_size[KPARAM_X], 0, 0);
+ input_set_abs_params(ptr, ABS_Y, 0, ptr_size[KPARAM_Y], 0, 0);
} else {
input_set_capability(ptr, EV_REL, REL_X);
input_set_capability(ptr, EV_REL, REL_Y);
@@ -309,9 +320,6 @@ static void xenkbd_disconnect_backend(struct xenkbd_info *info)
static void xenkbd_backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
- struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
- int ret, val;
-
switch (backend_state) {
case XenbusStateInitialising:
case XenbusStateInitialised:
@@ -321,15 +329,6 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
break;
case XenbusStateInitWait:
-InitWait:
- if (xenbus_read_unsigned(info->xbdev->otherend,
- "feature-abs-pointer", 0)) {
- ret = xenbus_write(XBT_NIL, info->xbdev->nodename,
- "request-abs-pointer", "1");
- if (ret)
- pr_warning("xenkbd: can't request abs-pointer");
- }
-
xenbus_switch_state(dev, XenbusStateConnected);
break;
@@ -340,17 +339,7 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
* get Connected twice here.
*/
if (dev->state != XenbusStateConnected)
- goto InitWait; /* no InitWait seen yet, fudge it */
-
- /* Set input abs params to match backend screen res */
- if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "width", "%d", &val) > 0)
- input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
-
- if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "height", "%d", &val) > 0)
- input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
-
+ xenbus_switch_state(dev, XenbusStateConnected);
break;
case XenbusStateClosed:
--
2.12.0
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