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[Xen-devel] [PATCH v1] xen/input: add multi-touch support



From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

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

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

---
Changes since initial:
 - use input_set_capability instead of setting flags directly
 - input_mt_init_slots: let userspace better chance of figuring
   how to handle the device: use INPUT_MT_DIRECT,
   drop INPUT_MT_DROP_UNUSED
 - add error handling for input_mt_init_slots
 - remove module paramters
 - remove odd unlikely
---
 drivers/input/misc/xen-kbdfront.c | 135 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 133 insertions(+), 2 deletions(-)

diff --git a/drivers/input/misc/xen-kbdfront.c 
b/drivers/input/misc/xen-kbdfront.c
index eb770613a9bd..9fa005038773 100644
--- a/drivers/input/misc/xen-kbdfront.c
+++ b/drivers/input/misc/xen-kbdfront.c
@@ -17,6 +17,7 @@
 #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>
@@ -34,11 +35,14 @@
 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 };
@@ -100,6 +104,60 @@ static irqreturn_t input_handler(int rq, void *dev_id)
                                input_report_rel(dev, REL_WHEEL,
                                                 -event->pos.rel_z);
                        break;
+               case XENKBD_TYPE_MTOUCH:
+                       dev = info->mtouch;
+                       if (unlikely(!dev))
+                               break;
+                       if (event->mtouch.contact_id !=
+                                       info->mtouch_cur_contact_id) {
+                               info->mtouch_cur_contact_id =
+                                       event->mtouch.contact_id;
+                               input_mt_slot(dev, event->mtouch.contact_id);
+                       }
+                       switch (event->mtouch.event_type) {
+                       case XENKBD_MT_EV_DOWN:
+                               input_mt_report_slot_state(dev, MT_TOOL_FINGER,
+                                                          true);
+                               input_event(dev, EV_ABS, ABS_MT_POSITION_X,
+                                           event->mtouch.u.pos.abs_x);
+                               input_event(dev, EV_ABS, ABS_MT_POSITION_Y,
+                                           event->mtouch.u.pos.abs_y);
+                               input_event(dev, EV_ABS, ABS_X,
+                                           event->mtouch.u.pos.abs_x);
+                               input_event(dev, EV_ABS, ABS_Y,
+                                           event->mtouch.u.pos.abs_y);
+                               break;
+                       case XENKBD_MT_EV_UP:
+                               input_mt_report_slot_state(dev, MT_TOOL_FINGER,
+                                                          false);
+                               break;
+                       case XENKBD_MT_EV_MOTION:
+                               input_event(dev, EV_ABS, ABS_MT_POSITION_X,
+                                           event->mtouch.u.pos.abs_x);
+                               input_event(dev, EV_ABS, ABS_MT_POSITION_Y,
+                                           event->mtouch.u.pos.abs_y);
+                               input_event(dev, EV_ABS, ABS_X,
+                                           event->mtouch.u.pos.abs_x);
+                               input_event(dev, EV_ABS, ABS_Y,
+                                           event->mtouch.u.pos.abs_y);
+                               break;
+                       case XENKBD_MT_EV_SYN:
+                               input_mt_sync_frame(dev);
+                               break;
+                       case XENKBD_MT_EV_SHAPE:
+                               input_event(dev, EV_ABS, ABS_MT_TOUCH_MAJOR,
+                                           event->mtouch.u.shape.major);
+                               input_event(dev, EV_ABS, ABS_MT_TOUCH_MINOR,
+                                           event->mtouch.u.shape.minor);
+                               break;
+                       case XENKBD_MT_EV_ORIENT:
+                               input_event(dev, EV_ABS, ABS_MT_ORIENTATION,
+                                           event->mtouch.u.orientation);
+                               break;
+                       }
+                       /* only report syn when requested */
+                       if (event->mtouch.event_type != XENKBD_MT_EV_SYN)
+                               dev = NULL;
                }
                if (dev)
                        input_sync(dev);
@@ -115,9 +173,9 @@ static int xenkbd_probe(struct xenbus_device *dev,
                                  const struct xenbus_device_id *id)
 {
        int ret, i;
-       unsigned int abs;
+       unsigned int abs, touch;
        struct xenkbd_info *info;
-       struct input_dev *kbd, *ptr;
+       struct input_dev *kbd, *ptr, *mtouch;
 
        info = kzalloc(sizeof(*info), GFP_KERNEL);
        if (!info) {
@@ -152,6 +210,17 @@ 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_warning("xenkbd: can't request multi-touch");
+                       touch = 0;
+               }
+       }
+
        /* keyboard */
        kbd = input_allocate_device();
        if (!kbd)
@@ -208,6 +277,66 @@ static int xenkbd_probe(struct xenbus_device *dev,
        }
        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_capability(mtouch, EV_KEY, BTN_TOUCH);
+               input_set_abs_params(mtouch, ABS_X,
+                                    0, width, 0, 0);
+               input_set_abs_params(mtouch, ABS_Y,
+                                    0, height, 0, 0);
+               input_set_abs_params(mtouch, ABS_PRESSURE,
+                                    0, 255, 0, 0);
+
+               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);
        if (ret < 0)
                goto error;
@@ -240,6 +369,8 @@ static int xenkbd_remove(struct xenbus_device *dev)
                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;
-- 
2.7.4


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