/*
|
* 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.
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#include <linux/kernel.h>
|
#include <linux/errno.h>
|
#include <linux/module.h>
|
#include <linux/input.h>
|
#include <linux/input/mt.h>
|
#include <linux/slab.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/xen.h>
|
#include <xen/events.h>
|
#include <xen/page.h>
|
#include <xen/grant_table.h>
|
#include <xen/interface/grant_table.h>
|
#include <xen/interface/io/fbif.h>
|
#include <xen/interface/io/kbdif.h>
|
#include <xen/xenbus.h>
|
#include <xen/platform_pci.h>
|
|
struct xenkbd_info {
|
struct input_dev *kbd;
|
struct input_dev *ptr;
|
struct input_dev *mtouch;
|
struct xenkbd_page *page;
|
int gref;
|
int irq;
|
struct xenbus_device *xbdev;
|
char phys[32];
|
/* current MT slot/contact ID we are injecting events in */
|
int mtouch_cur_contact_id;
|
};
|
|
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 *);
|
|
/*
|
* Note: if you need to send out events, see xenfb_do_update() for how
|
* to do that.
|
*/
|
|
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)
|
input_report_rel(info->ptr, REL_WHEEL, -motion->rel_z);
|
input_sync(info->ptr);
|
}
|
|
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)
|
input_report_rel(info->ptr, REL_WHEEL, -pos->rel_z);
|
input_sync(info->ptr);
|
}
|
|
static void xenkbd_handle_key_event(struct xenkbd_info *info,
|
struct xenkbd_key *key)
|
{
|
struct input_dev *dev;
|
int value = key->pressed;
|
|
if (test_bit(key->keycode, info->ptr->keybit)) {
|
dev = info->ptr;
|
} else if (test_bit(key->keycode, info->kbd->keybit)) {
|
dev = info->kbd;
|
if (key->pressed && test_bit(key->keycode, info->kbd->key))
|
value = 2; /* Mark as autorepeat */
|
} else {
|
pr_warn("unhandled keycode 0x%x\n", key->keycode);
|
return;
|
}
|
|
if (unlikely(!dev))
|
return;
|
|
input_event(dev, EV_KEY, key->keycode, value);
|
input_sync(dev);
|
}
|
|
static void xenkbd_handle_mt_event(struct xenkbd_info *info,
|
struct xenkbd_mtouch *mtouch)
|
{
|
if (unlikely(!info->mtouch))
|
return;
|
|
if (mtouch->contact_id != info->mtouch_cur_contact_id) {
|
info->mtouch_cur_contact_id = mtouch->contact_id;
|
input_mt_slot(info->mtouch, mtouch->contact_id);
|
}
|
|
switch (mtouch->event_type) {
|
case XENKBD_MT_EV_DOWN:
|
input_mt_report_slot_state(info->mtouch, MT_TOOL_FINGER, true);
|
fallthrough;
|
|
case XENKBD_MT_EV_MOTION:
|
input_report_abs(info->mtouch, ABS_MT_POSITION_X,
|
mtouch->u.pos.abs_x);
|
input_report_abs(info->mtouch, ABS_MT_POSITION_Y,
|
mtouch->u.pos.abs_y);
|
break;
|
|
case XENKBD_MT_EV_SHAPE:
|
input_report_abs(info->mtouch, ABS_MT_TOUCH_MAJOR,
|
mtouch->u.shape.major);
|
input_report_abs(info->mtouch, ABS_MT_TOUCH_MINOR,
|
mtouch->u.shape.minor);
|
break;
|
|
case XENKBD_MT_EV_ORIENT:
|
input_report_abs(info->mtouch, ABS_MT_ORIENTATION,
|
mtouch->u.orientation);
|
break;
|
|
case XENKBD_MT_EV_UP:
|
input_mt_report_slot_inactive(info->mtouch);
|
break;
|
|
case XENKBD_MT_EV_SYN:
|
input_mt_sync_frame(info->mtouch);
|
input_sync(info->mtouch);
|
break;
|
}
|
}
|
|
static void xenkbd_handle_event(struct xenkbd_info *info,
|
union xenkbd_in_event *event)
|
{
|
switch (event->type) {
|
case XENKBD_TYPE_MOTION:
|
xenkbd_handle_motion_event(info, &event->motion);
|
break;
|
|
case XENKBD_TYPE_KEY:
|
xenkbd_handle_key_event(info, &event->key);
|
break;
|
|
case XENKBD_TYPE_POS:
|
xenkbd_handle_position_event(info, &event->pos);
|
break;
|
|
case XENKBD_TYPE_MTOUCH:
|
xenkbd_handle_mt_event(info, &event->mtouch);
|
break;
|
}
|
}
|
|
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++)
|
xenkbd_handle_event(info, &XENKBD_IN_RING_REF(page, cons));
|
mb(); /* ensure we got ring contents */
|
page->in_cons = cons;
|
notify_remote_via_irq(info->irq);
|
|
return IRQ_HANDLED;
|
}
|
|
static int xenkbd_probe(struct xenbus_device *dev,
|
const struct xenbus_device_id *id)
|
{
|
int ret, i;
|
bool with_mtouch, with_kbd, with_ptr;
|
struct xenkbd_info *info;
|
struct input_dev *kbd, *ptr, *mtouch;
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
if (!info) {
|
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
|
return -ENOMEM;
|
}
|
dev_set_drvdata(&dev->dev, info);
|
info->xbdev = dev;
|
info->irq = -1;
|
info->gref = -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;
|
|
/*
|
* 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);
|
|
/* 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");
|
with_mtouch = 0;
|
}
|
}
|
|
/* keyboard */
|
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;
|
}
|
|
/* pointing device */
|
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;
|
}
|
}
|
|
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);
|
|
__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;
|
}
|
|
/* multi-touch device */
|
if (with_mtouch) {
|
int num_cont, width, height;
|
|
mtouch = input_allocate_device();
|
if (!mtouch)
|
goto error_nomem;
|
|
num_cont = xenbus_read_unsigned(info->xbdev->otherend,
|
XENKBD_FIELD_MT_NUM_CONTACTS,
|
1);
|
width = xenbus_read_unsigned(info->xbdev->otherend,
|
XENKBD_FIELD_MT_WIDTH,
|
XENFB_WIDTH);
|
height = xenbus_read_unsigned(info->xbdev->otherend,
|
XENKBD_FIELD_MT_HEIGHT,
|
XENFB_HEIGHT);
|
|
mtouch->name = "Xen Virtual Multi-touch";
|
mtouch->phys = info->phys;
|
mtouch->id.bustype = BUS_PCI;
|
mtouch->id.vendor = 0x5853;
|
mtouch->id.product = 0xfffd;
|
|
input_set_abs_params(mtouch, ABS_MT_TOUCH_MAJOR,
|
0, 255, 0, 0);
|
input_set_abs_params(mtouch, ABS_MT_POSITION_X,
|
0, width, 0, 0);
|
input_set_abs_params(mtouch, ABS_MT_POSITION_Y,
|
0, height, 0, 0);
|
|
ret = input_mt_init_slots(mtouch, num_cont, INPUT_MT_DIRECT);
|
if (ret) {
|
input_free_device(mtouch);
|
xenbus_dev_fatal(info->xbdev, ret,
|
"input_mt_init_slots");
|
goto error;
|
}
|
|
ret = input_register_device(mtouch);
|
if (ret) {
|
input_free_device(mtouch);
|
xenbus_dev_fatal(info->xbdev, ret,
|
"input_register_device(mtouch)");
|
goto error;
|
}
|
info->mtouch_cur_contact_id = -1;
|
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;
|
|
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_get_drvdata(&dev->dev);
|
|
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_get_drvdata(&dev->dev);
|
|
xenkbd_disconnect_backend(info);
|
if (info->kbd)
|
input_unregister_device(info->kbd);
|
if (info->ptr)
|
input_unregister_device(info->ptr);
|
if (info->mtouch)
|
input_unregister_device(info->mtouch);
|
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 = gnttab_grant_foreign_access(dev->otherend_id,
|
virt_to_gfn(info->page), 0);
|
if (ret < 0)
|
return ret;
|
info->gref = ret;
|
|
ret = xenbus_alloc_evtchn(dev, &evtchn);
|
if (ret)
|
goto error_grant;
|
ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
|
0, dev->devicetype, info);
|
if (ret < 0) {
|
xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
|
goto error_evtchan;
|
}
|
info->irq = ret;
|
|
again:
|
ret = xenbus_transaction_start(&xbt);
|
if (ret) {
|
xenbus_dev_fatal(dev, ret, "starting transaction");
|
goto error_irqh;
|
}
|
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_REF, "%lu",
|
virt_to_gfn(info->page));
|
if (ret)
|
goto error_xenbus;
|
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_GREF,
|
"%u", info->gref);
|
if (ret)
|
goto error_xenbus;
|
ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_EVT_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");
|
goto error_irqh;
|
}
|
|
xenbus_switch_state(dev, XenbusStateInitialised);
|
return 0;
|
|
error_xenbus:
|
xenbus_transaction_end(xbt, 1);
|
xenbus_dev_fatal(dev, ret, "writing xenstore");
|
error_irqh:
|
unbind_from_irqhandler(info->irq, info);
|
info->irq = -1;
|
error_evtchan:
|
xenbus_free_evtchn(dev, evtchn);
|
error_grant:
|
gnttab_end_foreign_access(info->gref, 0, 0UL);
|
info->gref = -1;
|
return ret;
|
}
|
|
static void xenkbd_disconnect_backend(struct xenkbd_info *info)
|
{
|
if (info->irq >= 0)
|
unbind_from_irqhandler(info->irq, info);
|
info->irq = -1;
|
if (info->gref >= 0)
|
gnttab_end_foreign_access(info->gref, 0, 0UL);
|
info->gref = -1;
|
}
|
|
static void xenkbd_backend_changed(struct xenbus_device *dev,
|
enum xenbus_state backend_state)
|
{
|
switch (backend_state) {
|
case XenbusStateInitialising:
|
case XenbusStateInitialised:
|
case XenbusStateReconfiguring:
|
case XenbusStateReconfigured:
|
case XenbusStateUnknown:
|
break;
|
|
case XenbusStateInitWait:
|
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)
|
xenbus_switch_state(dev, XenbusStateConnected);
|
break;
|
|
case XenbusStateClosed:
|
if (dev->state == XenbusStateClosed)
|
break;
|
fallthrough; /* Missed the backend's CLOSING state */
|
case XenbusStateClosing:
|
xenbus_frontend_closed(dev);
|
break;
|
}
|
}
|
|
static const struct xenbus_device_id xenkbd_ids[] = {
|
{ XENKBD_DRIVER_NAME },
|
{ "" }
|
};
|
|
static struct xenbus_driver xenkbd_driver = {
|
.ids = xenkbd_ids,
|
.probe = xenkbd_probe,
|
.remove = xenkbd_remove,
|
.resume = xenkbd_resume,
|
.otherend_changed = xenkbd_backend_changed,
|
};
|
|
static int __init xenkbd_init(void)
|
{
|
if (!xen_domain())
|
return -ENODEV;
|
|
/* Nothing to do if running in dom0. */
|
if (xen_initial_domain())
|
return -ENODEV;
|
|
if (!xen_has_pv_devices())
|
return -ENODEV;
|
|
return xenbus_register_frontend(&xenkbd_driver);
|
}
|
|
static void __exit xenkbd_cleanup(void)
|
{
|
xenbus_unregister_driver(&xenkbd_driver);
|
}
|
|
module_init(xenkbd_init);
|
module_exit(xenkbd_cleanup);
|
|
MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
|
MODULE_LICENSE("GPL");
|
MODULE_ALIAS("xen:" XENKBD_DRIVER_NAME);
|
