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-rw-r--r--drivers/input/misc/xen-kbdfront.c177
1 files changed, 106 insertions, 71 deletions
diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
index 92d739649022..594f72e39639 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -63,6 +63,9 @@ static void xenkbd_disconnect_backend(struct xenkbd_info *);
static void xenkbd_handle_motion_event(struct xenkbd_info *info,
struct xenkbd_motion *motion)
{
+ if (unlikely(!info->ptr))
+ return;
+
input_report_rel(info->ptr, REL_X, motion->rel_x);
input_report_rel(info->ptr, REL_Y, motion->rel_y);
if (motion->rel_z)
@@ -73,6 +76,9 @@ static void xenkbd_handle_motion_event(struct xenkbd_info *info,
static void xenkbd_handle_position_event(struct xenkbd_info *info,
struct xenkbd_position *pos)
{
+ if (unlikely(!info->ptr))
+ return;
+
input_report_abs(info->ptr, ABS_X, pos->abs_x);
input_report_abs(info->ptr, ABS_Y, pos->abs_y);
if (pos->rel_z)
@@ -97,6 +103,9 @@ static void xenkbd_handle_key_event(struct xenkbd_info *info,
return;
}
+ if (unlikely(!dev))
+ return;
+
input_event(dev, EV_KEY, key->keycode, value);
input_sync(dev);
}
@@ -192,7 +201,7 @@ static int xenkbd_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int ret, i;
- unsigned int abs, touch;
+ bool with_mtouch, with_kbd, with_ptr;
struct xenkbd_info *info;
struct input_dev *kbd, *ptr, *mtouch;
@@ -211,93 +220,114 @@ 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,
- XENKBD_FIELD_FEAT_ABS_POINTER, 0);
- ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
- XENKBD_FIELD_WIDTH,
- ptr_size[KPARAM_X]);
- ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
- XENKBD_FIELD_HEIGHT,
- ptr_size[KPARAM_Y]);
- if (abs) {
- ret = xenbus_write(XBT_NIL, dev->nodename,
- XENKBD_FIELD_REQ_ABS_POINTER, "1");
- if (ret) {
- pr_warn("xenkbd: can't request abs-pointer\n");
- abs = 0;
- }
- }
+ /*
+ * The below are reverse logic, e.g. if the feature is set, then
+ * do not expose the corresponding virtual device.
+ */
+ with_kbd = !xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_FEAT_DSBL_KEYBRD, 0);
+
+ with_ptr = !xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_FEAT_DSBL_POINTER, 0);
- touch = xenbus_read_unsigned(dev->otherend,
- XENKBD_FIELD_FEAT_MTOUCH, 0);
- if (touch) {
+ /* Direct logic: if set, then create multi-touch device. */
+ with_mtouch = xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_FEAT_MTOUCH, 0);
+ if (with_mtouch) {
ret = xenbus_write(XBT_NIL, dev->nodename,
XENKBD_FIELD_REQ_MTOUCH, "1");
if (ret) {
pr_warn("xenkbd: can't request multi-touch");
- touch = 0;
+ with_mtouch = 0;
}
}
/* keyboard */
- kbd = input_allocate_device();
- if (!kbd)
- goto error_nomem;
- kbd->name = "Xen Virtual Keyboard";
- kbd->phys = info->phys;
- kbd->id.bustype = BUS_PCI;
- kbd->id.vendor = 0x5853;
- kbd->id.product = 0xffff;
-
- __set_bit(EV_KEY, kbd->evbit);
- for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
- __set_bit(i, kbd->keybit);
- for (i = KEY_OK; i < KEY_MAX; i++)
- __set_bit(i, kbd->keybit);
-
- ret = input_register_device(kbd);
- if (ret) {
- input_free_device(kbd);
- xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
- goto error;
+ if (with_kbd) {
+ kbd = input_allocate_device();
+ if (!kbd)
+ goto error_nomem;
+ kbd->name = "Xen Virtual Keyboard";
+ kbd->phys = info->phys;
+ kbd->id.bustype = BUS_PCI;
+ kbd->id.vendor = 0x5853;
+ kbd->id.product = 0xffff;
+
+ __set_bit(EV_KEY, kbd->evbit);
+ for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
+ __set_bit(i, kbd->keybit);
+ for (i = KEY_OK; i < KEY_MAX; i++)
+ __set_bit(i, kbd->keybit);
+
+ ret = input_register_device(kbd);
+ if (ret) {
+ input_free_device(kbd);
+ xenbus_dev_fatal(dev, ret,
+ "input_register_device(kbd)");
+ goto error;
+ }
+ info->kbd = kbd;
}
- info->kbd = kbd;
/* pointing device */
- ptr = input_allocate_device();
- if (!ptr)
- goto error_nomem;
- ptr->name = "Xen Virtual Pointer";
- ptr->phys = info->phys;
- ptr->id.bustype = BUS_PCI;
- ptr->id.vendor = 0x5853;
- ptr->id.product = 0xfffe;
-
- if (abs) {
- __set_bit(EV_ABS, ptr->evbit);
- 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);
- }
- input_set_capability(ptr, EV_REL, REL_WHEEL);
+ if (with_ptr) {
+ unsigned int abs;
+
+ /* Set input abs params to match backend screen res */
+ abs = xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_FEAT_ABS_POINTER, 0);
+ ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_WIDTH,
+ ptr_size[KPARAM_X]);
+ ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
+ XENKBD_FIELD_HEIGHT,
+ ptr_size[KPARAM_Y]);
+ if (abs) {
+ ret = xenbus_write(XBT_NIL, dev->nodename,
+ XENKBD_FIELD_REQ_ABS_POINTER, "1");
+ if (ret) {
+ pr_warn("xenkbd: can't request abs-pointer\n");
+ abs = 0;
+ }
+ }
- __set_bit(EV_KEY, ptr->evbit);
- for (i = BTN_LEFT; i <= BTN_TASK; i++)
- __set_bit(i, ptr->keybit);
+ ptr = input_allocate_device();
+ if (!ptr)
+ goto error_nomem;
+ ptr->name = "Xen Virtual Pointer";
+ ptr->phys = info->phys;
+ ptr->id.bustype = BUS_PCI;
+ ptr->id.vendor = 0x5853;
+ ptr->id.product = 0xfffe;
+
+ if (abs) {
+ __set_bit(EV_ABS, ptr->evbit);
+ 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);
+ }
+ input_set_capability(ptr, EV_REL, REL_WHEEL);
- ret = input_register_device(ptr);
- if (ret) {
- input_free_device(ptr);
- xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
- goto error;
+ __set_bit(EV_KEY, ptr->evbit);
+ for (i = BTN_LEFT; i <= BTN_TASK; i++)
+ __set_bit(i, ptr->keybit);
+
+ ret = input_register_device(ptr);
+ if (ret) {
+ input_free_device(ptr);
+ xenbus_dev_fatal(dev, ret,
+ "input_register_device(ptr)");
+ goto error;
+ }
+ info->ptr = ptr;
}
- info->ptr = ptr;
/* multi-touch device */
- if (touch) {
+ if (with_mtouch) {
int num_cont, width, height;
mtouch = input_allocate_device();
@@ -346,6 +376,11 @@ static int xenkbd_probe(struct xenbus_device *dev,
info->mtouch = mtouch;
}
+ if (!(with_kbd || with_ptr || with_mtouch)) {
+ ret = -ENXIO;
+ goto error;
+ }
+
ret = xenkbd_connect_backend(dev, info);
if (ret < 0)
goto error;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.