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Input: xen-kbdfront - add multi-touch support

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Extend xen_kbdfront to provide multi-touch support to unprivileged domains.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
[dtor: factor out various sub-protocols - multitouch, single touch, keys]
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Oleksandr Andrushchenko 2017-06-29 00:20:19 -07:00 committed by Dmitry Torokhov
parent 6593813378
commit 49aac8204d
1 changed files with 179 additions and 40 deletions
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219
drivers/input/misc/xen-kbdfront.c
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@ -17,6 +17,7 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/input.h> #include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <asm/xen/hypervisor.h> #include <asm/xen/hypervisor.h>
@ -34,11 +35,14 @@
struct xenkbd_info { struct xenkbd_info {
struct input_dev *kbd; struct input_dev *kbd;
struct input_dev *ptr; struct input_dev *ptr;
struct input_dev *mtouch;
struct xenkbd_page *page; struct xenkbd_page *page;
int gref; int gref;
int irq; int irq;
struct xenbus_device *xbdev; struct xenbus_device *xbdev;
char phys[32]; 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 }; enum { KPARAM_X, KPARAM_Y, KPARAM_CNT };
@ -56,6 +60,112 @@ static void xenkbd_disconnect_backend(struct xenkbd_info *);
* to do that. * to do that.
*/ */
static void xenkbd_handle_motion_event(struct xenkbd_info *info,
struct xenkbd_motion *motion)
{
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)
{
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;
if (test_bit(key->keycode, info->ptr->keybit)) {
dev = info->ptr;
} else if (test_bit(key->keycode, info->kbd->keybit)) {
dev = info->kbd;
} else {
pr_warn("unhandled keycode 0x%x\n", key->keycode);
return;
}
input_report_key(dev, key->keycode, key->pressed);
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);
/* fall through */
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_state(info->mtouch, MT_TOOL_FINGER, false);
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) static irqreturn_t input_handler(int rq, void *dev_id)
{ {
struct xenkbd_info *info = dev_id; struct xenkbd_info *info = dev_id;
@ -66,44 +176,8 @@ static irqreturn_t input_handler(int rq, void *dev_id)
if (prod == page->in_cons) if (prod == page->in_cons)
return IRQ_HANDLED; return IRQ_HANDLED;
rmb(); /* ensure we see ring contents up to prod */ rmb(); /* ensure we see ring contents up to prod */
for (cons = page->in_cons; cons != prod; cons++) { for (cons = page->in_cons; cons != prod; cons++)
union xenkbd_in_event *event; xenkbd_handle_event(info, &XENKBD_IN_RING_REF(page, cons));
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);
if (event->motion.rel_z)
input_report_rel(dev, REL_WHEEL,
-event->motion.rel_z);
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
pr_warn("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);
if (event->pos.rel_z)
input_report_rel(dev, REL_WHEEL,
-event->pos.rel_z);
break;
}
if (dev)
input_sync(dev);
}
mb(); /* ensure we got ring contents */ mb(); /* ensure we got ring contents */
page->in_cons = cons; page->in_cons = cons;
notify_remote_via_irq(info->irq); notify_remote_via_irq(info->irq);
@ -115,9 +189,9 @@ static int xenkbd_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id) const struct xenbus_device_id *id)
{ {
int ret, i; int ret, i;
unsigned int abs; unsigned int abs, touch;
struct xenkbd_info *info; struct xenkbd_info *info;
struct input_dev *kbd, *ptr; struct input_dev *kbd, *ptr, *mtouch;
info = kzalloc(sizeof(*info), GFP_KERNEL); info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) { if (!info) {
@ -152,6 +226,17 @@ static int xenkbd_probe(struct xenbus_device *dev,
} }
} }
touch = xenbus_read_unsigned(dev->nodename,
XENKBD_FIELD_FEAT_MTOUCH, 0);
if (touch) {
ret = xenbus_write(XBT_NIL, dev->nodename,
XENKBD_FIELD_REQ_MTOUCH, "1");
if (ret) {
pr_warn("xenkbd: can't request multi-touch");
touch = 0;
}
}
/* keyboard */ /* keyboard */
kbd = input_allocate_device(); kbd = input_allocate_device();
if (!kbd) if (!kbd)
@ -208,6 +293,58 @@ static int xenkbd_probe(struct xenbus_device *dev,
} }
info->ptr = ptr; info->ptr = ptr;
/* multi-touch device */
if (touch) {
int num_cont, width, height;
mtouch = input_allocate_device();
if (!mtouch)
goto error_nomem;
num_cont = xenbus_read_unsigned(info->xbdev->nodename,
XENKBD_FIELD_MT_NUM_CONTACTS,
1);
width = xenbus_read_unsigned(info->xbdev->nodename,
XENKBD_FIELD_MT_WIDTH,
XENFB_WIDTH);
height = xenbus_read_unsigned(info->xbdev->nodename,
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);
input_set_abs_params(mtouch, ABS_MT_PRESSURE,
0, 255, 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;
}
ret = xenkbd_connect_backend(dev, info); ret = xenkbd_connect_backend(dev, info);
if (ret < 0) if (ret < 0)
goto error; goto error;
@ -240,6 +377,8 @@ static int xenkbd_remove(struct xenbus_device *dev)
input_unregister_device(info->kbd); input_unregister_device(info->kbd);
if (info->ptr) if (info->ptr)
input_unregister_device(info->ptr); input_unregister_device(info->ptr);
if (info->mtouch)
input_unregister_device(info->mtouch);
free_page((unsigned long)info->page); free_page((unsigned long)info->page);
kfree(info); kfree(info);
return 0; return 0;