--- /dev/null
+/*
+ * linux/drivers/input/keyboard/xenkbd.c -- Xen para-virtual input device
+ *
+ * Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
+ * Copyright (C) 2006 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 xenfb.c.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <asm/hypervisor.h>
+#include <xen/evtchn.h>
+#include <xen/interface/io/fbif.h>
+#include <xen/interface/io/kbdif.h>
+#include <xen/xenbus.h>
+
+struct xenkbd_info
+{
+ struct input_dev *dev;
+ struct xenkbd_page *page;
+ unsigned evtchn;
+ int irq;
+ struct xenbus_device *xbdev;
+};
+
+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 pt_regs *regs)
+{
+ struct xenkbd_info *info = dev_id;
+ struct xenkbd_page *page = info->page;
+ __u32 cons, prod;
+
+ prod = page->in_prod;
+ if (prod == page->out_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;
+ event = &XENKBD_IN_RING_REF(page, cons);
+
+ 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);
+ break;
+ case XENKBD_TYPE_KEY:
+ input_report_key(info->dev, event->key.keycode, event->key.pressed);
+ 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);
+ break;
+ }
+ }
+ input_sync(info->dev);
+ mb(); /* ensure we got ring contents */
+ page->in_cons = cons;
+ notify_remote_via_evtchn(info->evtchn);
+
+ return IRQ_HANDLED;
+}
+
+int __devinit xenkbd_probe(struct xenbus_device *dev,
+ const struct xenbus_device_id *id)
+{
+ int ret, i;
+ struct xenkbd_info *info;
+ struct input_dev *input_dev;
+
+ 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->page = (void *)__get_free_page(GFP_KERNEL);
+ if (!info->page)
+ goto error_nomem;
+ 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)
+ goto error_nomem;
+
+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL) | BIT(EV_ABS);
+ input_dev->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);
+
+ /* FIXME not sure this is quite right */
+ for (i = 0; i < 256; i++)
+ set_bit(i, input_dev->keybit);
+
+ input_dev->name = "Xen Virtual Keyboard/Mouse";
+
+ 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);
+
+ ret = input_register_device(input_dev);
+ if (ret) {
+ input_free_device(input_dev);
+ xenbus_dev_fatal(dev, ret, "input_register_device");
+ goto error;
+ }
+ info->dev = input_dev;
+
+ 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);
+ 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);
+ input_unregister_device(info->dev);
+ 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;
+ struct xenbus_transaction xbt;
+
+ ret = xenbus_alloc_evtchn(dev, &info->evtchn);
+ if (ret)
+ return ret;
+ ret = bind_evtchn_to_irqhandler(info->evtchn, input_handler, 0,
+ "xenkbd", info);
+ if (ret < 0) {
+ xenbus_free_evtchn(dev, info->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",
+ info->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)
+ ; /* FIXME */
+ }
+ 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)
+{
+ return xenbus_unregister_driver(&xenkbd);
+}
+
+module_init(xenkbd_init);
+module_exit(xenkbd_cleanup);
+
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff