You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
340 lines
7.9 KiB
340 lines
7.9 KiB
/*
|
|
* Xen para-virtual input device
|
|
*
|
|
* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
|
|
* Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
|
|
*
|
|
* Based on linux/drivers/input/mouse/sermouse.c
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive for
|
|
* more details.
|
|
*/
|
|
|
|
/*
|
|
* TODO:
|
|
*
|
|
* Switch to grant tables together with xen-fbfront.c.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/input.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/events.h>
|
|
#include <xen/page.h>
|
|
#include <xen/interface/io/fbif.h>
|
|
#include <xen/interface/io/kbdif.h>
|
|
#include <xen/xenbus.h>
|
|
|
|
struct xenkbd_info {
|
|
struct input_dev *kbd;
|
|
struct input_dev *ptr;
|
|
struct xenkbd_page *page;
|
|
int irq;
|
|
struct xenbus_device *xbdev;
|
|
char phys[32];
|
|
};
|
|
|
|
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 *);
|
|
|
|
/*
|
|
* Note: if you need to send out events, see xenfb_do_update() for how
|
|
* to do that.
|
|
*/
|
|
|
|
static irqreturn_t input_handler(int rq, void *dev_id)
|
|
{
|
|
struct xenkbd_info *info = dev_id;
|
|
struct xenkbd_page *page = info->page;
|
|
__u32 cons, prod;
|
|
|
|
prod = page->in_prod;
|
|
if (prod == page->in_cons)
|
|
return IRQ_HANDLED;
|
|
rmb(); /* ensure we see ring contents up to prod */
|
|
for (cons = page->in_cons; cons != prod; cons++) {
|
|
union xenkbd_in_event *event;
|
|
struct input_dev *dev;
|
|
event = &XENKBD_IN_RING_REF(page, cons);
|
|
|
|
dev = info->ptr;
|
|
switch (event->type) {
|
|
case XENKBD_TYPE_MOTION:
|
|
input_report_rel(dev, REL_X, event->motion.rel_x);
|
|
input_report_rel(dev, REL_Y, event->motion.rel_y);
|
|
break;
|
|
case XENKBD_TYPE_KEY:
|
|
dev = NULL;
|
|
if (test_bit(event->key.keycode, info->kbd->keybit))
|
|
dev = info->kbd;
|
|
if (test_bit(event->key.keycode, info->ptr->keybit))
|
|
dev = info->ptr;
|
|
if (dev)
|
|
input_report_key(dev, event->key.keycode,
|
|
event->key.pressed);
|
|
else
|
|
printk(KERN_WARNING
|
|
"xenkbd: unhandled keycode 0x%x\n",
|
|
event->key.keycode);
|
|
break;
|
|
case XENKBD_TYPE_POS:
|
|
input_report_abs(dev, ABS_X, event->pos.abs_x);
|
|
input_report_abs(dev, ABS_Y, event->pos.abs_y);
|
|
break;
|
|
}
|
|
if (dev)
|
|
input_sync(dev);
|
|
}
|
|
mb(); /* ensure we got ring contents */
|
|
page->in_cons = cons;
|
|
notify_remote_via_irq(info->irq);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __devinit xenkbd_probe(struct xenbus_device *dev,
|
|
const struct xenbus_device_id *id)
|
|
{
|
|
int ret, i;
|
|
struct xenkbd_info *info;
|
|
struct input_dev *kbd, *ptr;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info) {
|
|
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
|
|
return -ENOMEM;
|
|
}
|
|
dev->dev.driver_data = info;
|
|
info->xbdev = dev;
|
|
info->irq = -1;
|
|
snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
|
|
|
|
info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
|
|
if (!info->page)
|
|
goto error_nomem;
|
|
|
|
/* 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;
|
|
kbd->evbit[0] = BIT(EV_KEY);
|
|
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;
|
|
|
|
/* 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;
|
|
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);
|
|
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(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)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error_nomem:
|
|
ret = -ENOMEM;
|
|
xenbus_dev_fatal(dev, ret, "allocating device memory");
|
|
error:
|
|
xenkbd_remove(dev);
|
|
return ret;
|
|
}
|
|
|
|
static int xenkbd_resume(struct xenbus_device *dev)
|
|
{
|
|
struct xenkbd_info *info = dev->dev.driver_data;
|
|
|
|
xenkbd_disconnect_backend(info);
|
|
memset(info->page, 0, PAGE_SIZE);
|
|
return xenkbd_connect_backend(dev, info);
|
|
}
|
|
|
|
static int xenkbd_remove(struct xenbus_device *dev)
|
|
{
|
|
struct xenkbd_info *info = dev->dev.driver_data;
|
|
|
|
xenkbd_disconnect_backend(info);
|
|
if (info->kbd)
|
|
input_unregister_device(info->kbd);
|
|
if (info->ptr)
|
|
input_unregister_device(info->ptr);
|
|
free_page((unsigned long)info->page);
|
|
kfree(info);
|
|
return 0;
|
|
}
|
|
|
|
static int xenkbd_connect_backend(struct xenbus_device *dev,
|
|
struct xenkbd_info *info)
|
|
{
|
|
int ret, evtchn;
|
|
struct xenbus_transaction xbt;
|
|
|
|
ret = xenbus_alloc_evtchn(dev, &evtchn);
|
|
if (ret)
|
|
return ret;
|
|
ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
|
|
0, dev->devicetype, info);
|
|
if (ret < 0) {
|
|
xenbus_free_evtchn(dev, evtchn);
|
|
xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
|
|
return ret;
|
|
}
|
|
info->irq = ret;
|
|
|
|
again:
|
|
ret = xenbus_transaction_start(&xbt);
|
|
if (ret) {
|
|
xenbus_dev_fatal(dev, ret, "starting transaction");
|
|
return ret;
|
|
}
|
|
ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
|
|
virt_to_mfn(info->page));
|
|
if (ret)
|
|
goto error_xenbus;
|
|
ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
|
|
evtchn);
|
|
if (ret)
|
|
goto error_xenbus;
|
|
ret = xenbus_transaction_end(xbt, 0);
|
|
if (ret) {
|
|
if (ret == -EAGAIN)
|
|
goto again;
|
|
xenbus_dev_fatal(dev, ret, "completing transaction");
|
|
return ret;
|
|
}
|
|
|
|
xenbus_switch_state(dev, XenbusStateInitialised);
|
|
return 0;
|
|
|
|
error_xenbus:
|
|
xenbus_transaction_end(xbt, 1);
|
|
xenbus_dev_fatal(dev, ret, "writing xenstore");
|
|
return ret;
|
|
}
|
|
|
|
static void xenkbd_disconnect_backend(struct xenkbd_info *info)
|
|
{
|
|
if (info->irq >= 0)
|
|
unbind_from_irqhandler(info->irq, info);
|
|
info->irq = -1;
|
|
}
|
|
|
|
static void xenkbd_backend_changed(struct xenbus_device *dev,
|
|
enum xenbus_state backend_state)
|
|
{
|
|
struct xenkbd_info *info = dev->dev.driver_data;
|
|
int ret, val;
|
|
|
|
switch (backend_state) {
|
|
case XenbusStateInitialising:
|
|
case XenbusStateInitialised:
|
|
case XenbusStateUnknown:
|
|
case XenbusStateClosed:
|
|
break;
|
|
|
|
case XenbusStateInitWait:
|
|
InitWait:
|
|
ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
|
|
"feature-abs-pointer", "%d", &val);
|
|
if (ret < 0)
|
|
val = 0;
|
|
if (val) {
|
|
ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
|
|
"request-abs-pointer", "1");
|
|
if (ret)
|
|
printk(KERN_WARNING
|
|
"xenkbd: can't request abs-pointer");
|
|
}
|
|
xenbus_switch_state(dev, XenbusStateConnected);
|
|
break;
|
|
|
|
case XenbusStateConnected:
|
|
/*
|
|
* Work around xenbus race condition: If backend goes
|
|
* through InitWait to Connected fast enough, we can
|
|
* get Connected twice here.
|
|
*/
|
|
if (dev->state != XenbusStateConnected)
|
|
goto InitWait; /* no InitWait seen yet, fudge it */
|
|
break;
|
|
|
|
case XenbusStateClosing:
|
|
xenbus_frontend_closed(dev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct xenbus_device_id xenkbd_ids[] = {
|
|
{ "vkbd" },
|
|
{ "" }
|
|
};
|
|
|
|
static struct xenbus_driver xenkbd = {
|
|
.name = "vkbd",
|
|
.owner = THIS_MODULE,
|
|
.ids = xenkbd_ids,
|
|
.probe = xenkbd_probe,
|
|
.remove = xenkbd_remove,
|
|
.resume = xenkbd_resume,
|
|
.otherend_changed = xenkbd_backend_changed,
|
|
};
|
|
|
|
static int __init xenkbd_init(void)
|
|
{
|
|
if (!is_running_on_xen())
|
|
return -ENODEV;
|
|
|
|
/* Nothing to do if running in dom0. */
|
|
if (is_initial_xendomain())
|
|
return -ENODEV;
|
|
|
|
return xenbus_register_frontend(&xenkbd);
|
|
}
|
|
|
|
static void __exit xenkbd_cleanup(void)
|
|
{
|
|
xenbus_unregister_driver(&xenkbd);
|
|
}
|
|
|
|
module_init(xenkbd_init);
|
|
module_exit(xenkbd_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|