372 lines
8.9 KiB
C
372 lines
8.9 KiB
C
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/*
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* Xen para-virtual input device
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*
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* Copyright (C) 2005 Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2006-2008 Red Hat, Inc., Markus Armbruster <armbru@redhat.com>
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*
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* Based on linux/drivers/input/mouse/sermouse.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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/*
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* TODO:
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*
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* Switch to grant tables together with xen-fbfront.c.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/events.h>
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#include <xen/page.h>
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#include <xen/interface/io/fbif.h>
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#include <xen/interface/io/kbdif.h>
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#include <xen/xenbus.h>
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struct xenkbd_info {
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struct input_dev *kbd;
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struct input_dev *ptr;
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struct xenkbd_page *page;
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int irq;
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struct xenbus_device *xbdev;
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char phys[32];
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};
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static int xenkbd_remove(struct xenbus_device *);
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static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info *);
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static void xenkbd_disconnect_backend(struct xenkbd_info *);
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/*
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* Note: if you need to send out events, see xenfb_do_update() for how
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* to do that.
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*/
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static irqreturn_t input_handler(int rq, void *dev_id)
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{
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struct xenkbd_info *info = dev_id;
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struct xenkbd_page *page = info->page;
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__u32 cons, prod;
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prod = page->in_prod;
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if (prod == page->in_cons)
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return IRQ_HANDLED;
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rmb(); /* ensure we see ring contents up to prod */
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for (cons = page->in_cons; cons != prod; cons++) {
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union xenkbd_in_event *event;
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struct input_dev *dev;
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event = &XENKBD_IN_RING_REF(page, cons);
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dev = info->ptr;
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switch (event->type) {
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case XENKBD_TYPE_MOTION:
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input_report_rel(dev, REL_X, event->motion.rel_x);
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input_report_rel(dev, REL_Y, event->motion.rel_y);
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if (event->motion.rel_z)
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input_report_rel(dev, REL_WHEEL,
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-event->motion.rel_z);
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break;
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case XENKBD_TYPE_KEY:
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dev = NULL;
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if (test_bit(event->key.keycode, info->kbd->keybit))
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dev = info->kbd;
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if (test_bit(event->key.keycode, info->ptr->keybit))
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dev = info->ptr;
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if (dev)
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input_report_key(dev, event->key.keycode,
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event->key.pressed);
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else
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printk(KERN_WARNING
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"xenkbd: unhandled keycode 0x%x\n",
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event->key.keycode);
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break;
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case XENKBD_TYPE_POS:
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input_report_abs(dev, ABS_X, event->pos.abs_x);
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input_report_abs(dev, ABS_Y, event->pos.abs_y);
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if (event->pos.rel_z)
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input_report_rel(dev, REL_WHEEL,
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-event->pos.rel_z);
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break;
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}
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if (dev)
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input_sync(dev);
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}
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mb(); /* ensure we got ring contents */
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page->in_cons = cons;
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notify_remote_via_irq(info->irq);
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return IRQ_HANDLED;
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}
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static int __devinit xenkbd_probe(struct xenbus_device *dev,
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const struct xenbus_device_id *id)
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{
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int ret, i, abs;
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struct xenkbd_info *info;
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struct input_dev *kbd, *ptr;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
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return -ENOMEM;
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}
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dev_set_drvdata(&dev->dev, info);
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info->xbdev = dev;
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info->irq = -1;
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snprintf(info->phys, sizeof(info->phys), "xenbus/%s", dev->nodename);
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info->page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
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if (!info->page)
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goto error_nomem;
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if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-abs-pointer", "%d", &abs) < 0)
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abs = 0;
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if (abs)
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xenbus_printf(XBT_NIL, dev->nodename, "request-abs-pointer", "1");
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/* keyboard */
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kbd = input_allocate_device();
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if (!kbd)
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goto error_nomem;
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kbd->name = "Xen Virtual Keyboard";
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kbd->phys = info->phys;
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kbd->id.bustype = BUS_PCI;
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kbd->id.vendor = 0x5853;
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kbd->id.product = 0xffff;
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__set_bit(EV_KEY, kbd->evbit);
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for (i = KEY_ESC; i < KEY_UNKNOWN; i++)
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__set_bit(i, kbd->keybit);
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for (i = KEY_OK; i < KEY_MAX; i++)
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__set_bit(i, kbd->keybit);
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ret = input_register_device(kbd);
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if (ret) {
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input_free_device(kbd);
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xenbus_dev_fatal(dev, ret, "input_register_device(kbd)");
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goto error;
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}
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info->kbd = kbd;
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/* pointing device */
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ptr = input_allocate_device();
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if (!ptr)
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goto error_nomem;
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ptr->name = "Xen Virtual Pointer";
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ptr->phys = info->phys;
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ptr->id.bustype = BUS_PCI;
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ptr->id.vendor = 0x5853;
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ptr->id.product = 0xfffe;
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if (abs) {
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__set_bit(EV_ABS, ptr->evbit);
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input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
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input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
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} else {
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input_set_capability(ptr, EV_REL, REL_X);
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input_set_capability(ptr, EV_REL, REL_Y);
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}
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input_set_capability(ptr, EV_REL, REL_WHEEL);
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__set_bit(EV_KEY, ptr->evbit);
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for (i = BTN_LEFT; i <= BTN_TASK; i++)
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__set_bit(i, ptr->keybit);
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ret = input_register_device(ptr);
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if (ret) {
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input_free_device(ptr);
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xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
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goto error;
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}
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info->ptr = ptr;
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ret = xenkbd_connect_backend(dev, info);
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if (ret < 0)
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goto error;
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return 0;
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error_nomem:
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ret = -ENOMEM;
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xenbus_dev_fatal(dev, ret, "allocating device memory");
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error:
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xenkbd_remove(dev);
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return ret;
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}
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static int xenkbd_resume(struct xenbus_device *dev)
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{
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struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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xenkbd_disconnect_backend(info);
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memset(info->page, 0, PAGE_SIZE);
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return xenkbd_connect_backend(dev, info);
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}
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static int xenkbd_remove(struct xenbus_device *dev)
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{
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struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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xenkbd_disconnect_backend(info);
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if (info->kbd)
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input_unregister_device(info->kbd);
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if (info->ptr)
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input_unregister_device(info->ptr);
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free_page((unsigned long)info->page);
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kfree(info);
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return 0;
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}
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static int xenkbd_connect_backend(struct xenbus_device *dev,
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struct xenkbd_info *info)
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{
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int ret, evtchn;
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struct xenbus_transaction xbt;
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ret = xenbus_alloc_evtchn(dev, &evtchn);
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if (ret)
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return ret;
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ret = bind_evtchn_to_irqhandler(evtchn, input_handler,
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0, dev->devicetype, info);
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if (ret < 0) {
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xenbus_free_evtchn(dev, evtchn);
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xenbus_dev_fatal(dev, ret, "bind_evtchn_to_irqhandler");
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return ret;
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}
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info->irq = ret;
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again:
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ret = xenbus_transaction_start(&xbt);
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if (ret) {
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xenbus_dev_fatal(dev, ret, "starting transaction");
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return ret;
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}
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ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
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virt_to_mfn(info->page));
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if (ret)
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goto error_xenbus;
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ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
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evtchn);
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if (ret)
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goto error_xenbus;
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ret = xenbus_transaction_end(xbt, 0);
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if (ret) {
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if (ret == -EAGAIN)
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goto again;
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xenbus_dev_fatal(dev, ret, "completing transaction");
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return ret;
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}
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xenbus_switch_state(dev, XenbusStateInitialised);
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return 0;
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error_xenbus:
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xenbus_transaction_end(xbt, 1);
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xenbus_dev_fatal(dev, ret, "writing xenstore");
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return ret;
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}
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static void xenkbd_disconnect_backend(struct xenkbd_info *info)
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{
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if (info->irq >= 0)
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unbind_from_irqhandler(info->irq, info);
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info->irq = -1;
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}
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static void xenkbd_backend_changed(struct xenbus_device *dev,
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enum xenbus_state backend_state)
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{
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struct xenkbd_info *info = dev_get_drvdata(&dev->dev);
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int ret, val;
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switch (backend_state) {
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case XenbusStateInitialising:
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case XenbusStateInitialised:
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case XenbusStateUnknown:
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case XenbusStateClosed:
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break;
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case XenbusStateInitWait:
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InitWait:
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ret = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
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"feature-abs-pointer", "%d", &val);
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if (ret < 0)
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val = 0;
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if (val) {
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ret = xenbus_printf(XBT_NIL, info->xbdev->nodename,
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"request-abs-pointer", "1");
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if (ret)
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pr_warning("can't request abs-pointer\n");
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}
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xenbus_switch_state(dev, XenbusStateConnected);
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break;
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case XenbusStateConnected:
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/*
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* Work around xenbus race condition: If backend goes
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* through InitWait to Connected fast enough, we can
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* get Connected twice here.
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*/
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if (dev->state != XenbusStateConnected)
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goto InitWait; /* no InitWait seen yet, fudge it */
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/* Set input abs params to match backend screen res */
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if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
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"width", "%d", &val) > 0)
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input_set_abs_params(info->ptr, ABS_X, 0, val, 0, 0);
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if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
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"height", "%d", &val) > 0)
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input_set_abs_params(info->ptr, ABS_Y, 0, val, 0, 0);
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break;
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case XenbusStateClosing:
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xenbus_frontend_closed(dev);
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break;
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}
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}
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static struct xenbus_device_id xenkbd_ids[] = {
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{ "vkbd" },
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{ "" }
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};
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static struct xenbus_driver xenkbd_driver = {
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.name = "vkbd",
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.owner = THIS_MODULE,
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.ids = xenkbd_ids,
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.probe = xenkbd_probe,
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.remove = xenkbd_remove,
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.resume = xenkbd_resume,
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.otherend_changed = xenkbd_backend_changed,
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};
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static int __init xenkbd_init(void)
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{
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if (!xen_domain())
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return -ENODEV;
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/* Nothing to do if running in dom0. */
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if (xen_initial_domain())
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return -ENODEV;
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return xenbus_register_frontend(&xenkbd_driver);
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}
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static void __exit xenkbd_cleanup(void)
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{
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xenbus_unregister_driver(&xenkbd_driver);
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}
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module_init(xenkbd_init);
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module_exit(xenkbd_cleanup);
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MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("xen:vkbd");
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