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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [patch] pvfb: Split mouse and keyboard into separate devices.
Markus Armbruster wrote: > Review below. >> + kbd = input_allocate_device(); >> + ptr = input_allocate_device(); >> + if (!kbd || !ptr) >> goto error_nomem; > > If just one of two fails, the other is leaked, I fear. Yep, you are right, fixed version attached. > It *might* be simpler to have something like > > error: > if (ptr) > input_free_device(ptr); > if (kbd) > input_free_device(kbd); I don't think it would simplify the code because you'll have to take care then that the xenkbd_remove() call in the error path doesn't result in a double-free ... cheers, Gerd -- Gerd Hoffmann <kraxel@xxxxxxx> pvfb: Split mouse and keyboard into separate devices.
This patch creates two separate input devices for keyboard and mouse
events. The reason for this is to separate them in the linux input
layer and allow them being routed different ways.
Use case: Configure the X-Server like this to get the mouse
events directly from the linux input layer, which has the major
advantage that absolute coordinates work correctly:
Section "InputDevice"
Driver "evdev"
Identifier "Mouse[1]"
Option "Device" "/dev/input/event<nr>"
EndSection
This makes the keyboard stop working though in case mouse and
keyboard events are coming through the same input device.
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxx>
Cc: Markus Armbruster <armbru@xxxxxxxxxx>
---
linux-2.6-xen-sparse/drivers/xen/fbfront/xenkbd.c | 64 ++++++++++++++--------
1 file changed, 42 insertions(+), 22 deletions(-)
Index: build-64-unstable-13762/linux-2.6-xen-sparse/drivers/xen/fbfront/xenkbd.c
===================================================================
---
build-64-unstable-13762.orig/linux-2.6-xen-sparse/drivers/xen/fbfront/xenkbd.c
+++ build-64-unstable-13762/linux-2.6-xen-sparse/drivers/xen/fbfront/xenkbd.c
@@ -29,7 +29,8 @@
struct xenkbd_info
{
- struct input_dev *dev;
+ struct input_dev *kbd;
+ struct input_dev *ptr;
struct xenkbd_page *page;
int irq;
struct xenbus_device *xbdev;
@@ -60,19 +61,21 @@ static irqreturn_t input_handler(int rq,
switch (event->type) {
case XENKBD_TYPE_MOTION:
- input_report_rel(info->dev, REL_X, event->motion.rel_x);
- input_report_rel(info->dev, REL_Y, event->motion.rel_y);
+ input_report_rel(info->ptr, REL_X, event->motion.rel_x);
+ input_report_rel(info->ptr, REL_Y, event->motion.rel_y);
+ input_sync(info->ptr);
break;
case XENKBD_TYPE_KEY:
- input_report_key(info->dev, event->key.keycode,
event->key.pressed);
+ input_report_key(info->kbd, event->key.keycode,
event->key.pressed);
+ input_sync(info->kbd);
break;
case XENKBD_TYPE_POS:
- input_report_abs(info->dev, ABS_X, event->pos.abs_x);
- input_report_abs(info->dev, ABS_Y, event->pos.abs_y);
+ input_report_abs(info->ptr, ABS_X, event->pos.abs_x);
+ input_report_abs(info->ptr, ABS_Y, event->pos.abs_y);
+ input_sync(info->ptr);
break;
}
}
- input_sync(info->dev);
mb(); /* ensure we got ring contents */
page->in_cons = cons;
notify_remote_via_irq(info->irq);
@@ -85,7 +88,7 @@ int __devinit xenkbd_probe(struct xenbus
{
int ret, i;
struct xenkbd_info *info;
- struct input_dev *input_dev;
+ struct input_dev *kbd, *ptr;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
@@ -101,32 +104,46 @@ int __devinit xenkbd_probe(struct xenbus
info->page->in_cons = info->page->in_prod = 0;
info->page->out_cons = info->page->out_prod = 0;
- input_dev = input_allocate_device();
- if (!input_dev)
+ kbd = input_allocate_device();
+ if (!kbd)
goto error_nomem;
+ ptr = input_allocate_device();
+ if (!ptr)
+ goto error_nomem_2;
- input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS);
- input_dev->keybit[LONG(BTN_MOUSE)]
+ ptr->evbit[0] = BIT(EV_REL) | BIT(EV_ABS);
+ ptr->keybit[LONG(BTN_MOUSE)]
= BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
/* TODO additional buttons */
- input_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
+ ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y);
+ kbd->evbit[0] = BIT(EV_KEY);
/* FIXME not sure this is quite right */
for (i = 0; i < 256; i++)
- set_bit(i, input_dev->keybit);
+ set_bit(i, kbd->keybit);
- input_dev->name = "Xen Virtual Keyboard/Mouse";
+ kbd->name = "Xen Virtual Keyboard";
+ ptr->name = "Xen Virtual Touchscreen";
- input_set_abs_params(input_dev, ABS_X, 0, XENFB_WIDTH, 0, 0);
- input_set_abs_params(input_dev, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
+ input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
+ input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
- ret = input_register_device(input_dev);
+ ret = input_register_device(kbd);
if (ret) {
- input_free_device(input_dev);
- xenbus_dev_fatal(dev, ret, "input_register_device");
+ input_free_device(kbd);
+ input_free_device(ptr);
+ xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
goto error;
}
- info->dev = input_dev;
+ info->kbd = kbd;
+
+ 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;
ret = xenkbd_connect_backend(dev, info);
if (ret < 0)
@@ -134,6 +151,8 @@ int __devinit xenkbd_probe(struct xenbus
return 0;
+ error_nomem_2:
+ input_free_device(kbd);
error_nomem:
ret = -ENOMEM;
xenbus_dev_fatal(dev, ret, "allocating device memory");
@@ -155,7 +174,8 @@ static int xenkbd_remove(struct xenbus_d
struct xenkbd_info *info = dev->dev.driver_data;
xenkbd_disconnect_backend(info);
- input_unregister_device(info->dev);
+ input_unregister_device(info->kbd);
+ input_unregister_device(info->ptr);
free_page((unsigned long)info->page);
kfree(info);
return 0;
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