From 8b3afdfa48c70144479a2a5ca51a66e96ec60934 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Wed, 19 Apr 2017 08:47:06 -0700 Subject: [PATCH] Input: xen-kbdfront - add module parameter for setting resolution 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 Signed-off-by: Dmitry Torokhov --- 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 1fd911d..690148f 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_warn("xenkbd: can't request abs-pointer\n"); - } - xenbus_switch_state(dev, XenbusStateConnected); break; @@ -340,17 +339,7 @@ InitWait: * 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: -- 2.7.4