# HG changeset patch
# User Anthony Liguori <anthony@xxxxxxxxxxxxx>
# Node ID 2b3f2e8722737cdc8931398cde598570b3250f27
# Parent 2b1f225753ed4480c9968866b5955df878eea04d
Xen Virtual Keyboard/Mouse driver
This driver is a pretty basic shared-memory message queue that is used to
transmit input events. It probably needs some more work to be more correct
for non-US keyboard layouts.
Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx>
diff -r 2b1f225753ed -r 2b3f2e872273
linux-2.6-xen-sparse/drivers/input/keyboard/Makefile
--- /dev/null Sun Jan 15 18:08:56 2006 -0500
+++ b/linux-2.6-xen-sparse/drivers/input/keyboard/Makefile Sun Jan 15
18:10:29 2006 -0500
@@ -0,0 +1,20 @@
+#
+# Makefile for the input core drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_KEYBOARD_ATKBD) += atkbd.o
+obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
+obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
+obj-$(CONFIG_KEYBOARD_LKKBD) += lkkbd.o
+obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
+obj-$(CONFIG_KEYBOARD_AMIGA) += amikbd.o
+obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o
+obj-$(CONFIG_KEYBOARD_NEWTON) += newtonkbd.o
+obj-$(CONFIG_KEYBOARD_98KBD) += 98kbd.o
+obj-$(CONFIG_KEYBOARD_CORGI) += corgikbd.o
+obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
+obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
+obj-$(CONFIG_KEYBOARD_XENKBD) += xenkbd.o
+
diff -r 2b1f225753ed -r 2b3f2e872273
linux-2.6-xen-sparse/drivers/input/keyboard/xenkbd.c
--- /dev/null Sun Jan 15 18:08:56 2006 -0500
+++ b/linux-2.6-xen-sparse/drivers/input/keyboard/xenkbd.c Sun Jan 15
18:10:29 2006 -0500
@@ -0,0 +1,166 @@
+/*
+ * linux/drivers/input/keyboard/xenkbd.c -- Xen para-virtual input device
+ *
+ * Copyright (C) 2005
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <asm/hypervisor.h>
+#include <asm-xen/evtchn.h>
+#include <linux/xenkbd.h>
+
+struct xenkbd_device
+{
+ struct input_dev dev;
+ struct xenkbd_info *info;
+};
+
+static irqreturn_t input_handler(int rq, void *dev_id, struct pt_regs *regs)
+{
+ struct xenkbd_device *dev = dev_id;
+ struct xenkbd_info *info = dev ? dev->info : 0;
+ static int button_map[3] = { BTN_RIGHT, BTN_MIDDLE, BTN_LEFT };
+ __u32 cons, prod;
+
+ if (!info || !info->initialized)
+ return IRQ_NONE;
+
+ /* FIXME barriers */
+ prod = XENKBD_MASK_RING(info->in_prod, info->in);
+ cons = XENKBD_MASK_RING(info->in_cons, info->in);
+
+ if (prod == cons)
+ return IRQ_HANDLED;
+
+ for (; cons != prod; cons = XENKBD_MASK_RING(cons + 1, info->in)) {
+ union xenkbd_in_event *event;
+
+ event = &info->in[cons];
+
+ switch (event->type) {
+ case XENKBD_TYPE_MOTION:
+ input_report_rel(&dev->dev, REL_X, event->motion.rel_x);
+ input_report_rel(&dev->dev, REL_Y, event->motion.rel_y);
+ break;
+ case XENKBD_TYPE_BUTTON:
+ if (event->button.button < 3)
+ input_report_key(&dev->dev,
+
button_map[event->button.button],
+ event->button.pressed);
+ break;
+ case XENKBD_TYPE_KEY:
+ input_report_key(&dev->dev, event->key.keycode,
event->key.pressed);
+ break;
+ }
+
+ notify_remote_via_evtchn(xen_start_info->kbd_evtchn);
+ }
+ input_sync(&dev->dev);
+
+ info->in_cons = cons;
+
+ return IRQ_HANDLED;
+}
+
+static struct xenkbd_device *xenkbd_dev;
+static int xenkbd_irq;
+
+int __init xenkbd_init(void)
+{
+ int ret = 0;
+ int i;
+ struct xenkbd_device *dev;
+
+ if (xen_start_info->kbd_evtchn == 0)
+ return -ENODEV;
+
+ dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL)
+ return -ENOMEM;
+
+ dev->info = mfn_to_virt(xen_start_info->kbd_mfn);
+ dev->info->initialized = 0;
+
+ ret = bind_evtchn_to_irqhandler(xen_start_info->kbd_evtchn,
+ input_handler,
+ 0,
+ "xenkbd",
+ dev);
+ if (ret <= 0) {
+ kfree(dev);
+ return ret;
+ }
+
+ xenkbd_irq = ret;
+
+ init_input_dev(&dev->dev);
+ dev->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
+ dev->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);
+ dev->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
+
+ /* FIXME */
+ for (i = 0; i < 256; i++)
+ set_bit(i, dev->dev.keybit);
+
+ dev->dev.name = "Xen Virtual Keyboard/Mouse";
+
+ input_register_device(&dev->dev);
+
+ dev->info->in_cons = dev->info->in_prod = 0;
+ dev->info->out_cons = dev->info->out_prod = 0;
+ dev->info->initialized = 1;
+
+ xenkbd_dev = dev;
+
+ return ret;
+}
+
+static void __exit xenkbd_cleanup(void)
+{
+ if (xenkbd_dev) {
+ /* FIXME how do we unbind the evtchn? */
+ /* FIXME does dev->info need to be unmapped? */
+ input_unregister_device(&xenkbd_dev->dev);
+ kfree(xenkbd_dev);
+ }
+}
+
+void xenkbd_resume(void)
+{
+ int ret;
+
+ if (xenkbd_dev && xen_start_info->kbd_evtchn) {
+#if 0
+ if (xenkbd_irq)
+ unbind_from_irqhandler(xenkbd_irq, NULL);
+#endif
+
+ ret = bind_evtchn_to_irqhandler(xen_start_info->kbd_evtchn,
+ input_handler,
+ 0,
+ "xenkbd",
+ xenkbd_dev);
+
+ if (ret <= 0)
+ return;
+
+ xenkbd_irq = ret;
+ xenkbd_dev->info = mfn_to_virt(xen_start_info->kbd_mfn);
+ }
+}
+
+module_init(xenkbd_init);
+module_exit(xenkbd_cleanup);
+
+MODULE_LICENSE("GPL");
diff -r 2b1f225753ed -r 2b3f2e872273 linux-2.6-xen-sparse/include/linux/xenkbd.h
--- /dev/null Sun Jan 15 18:08:56 2006 -0500
+++ b/linux-2.6-xen-sparse/include/linux/xenkbd.h Sun Jan 15 18:10:29
2006 -0500
@@ -0,0 +1,81 @@
+/*
+ * linux/include/linux/xenkbd.h -- Xen virtual keyboard/mouse
+ *
+ * Copyright (C) 2005
+ *
+ * Anthony Liguori <aliguori@xxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_XENKBD_H
+#define _LINUX_XENKBD_H
+
+#include <asm/types.h>
+
+/* in events */
+
+#define XENKBD_TYPE_MOTION 1 /* mouse movement event */
+#define XENKBD_TYPE_BUTTON 2 /* mouse button event */
+#define XENKBD_TYPE_KEY 3 /* keyboard event */
+
+struct xenkbd_motion
+{
+ __u8 type; /* XENKBD_TYPE_MOTION */
+ __s16 rel_x; /* relative X motion */
+ __s16 rel_y; /* relative Y motion */
+};
+
+struct xenkbd_button
+{
+ __u8 type; /* XENKBD_TYPE_BUTTON */
+ __u8 pressed; /* 1 if pressed; 0 otherwise */
+ __u8 button; /* the button (0, 1, 2 is right, middle, left) */
+};
+
+struct xenkbd_key
+{
+ __u8 type; /* XENKBD_TYPE_KEY */
+ __u8 pressed; /* 1 if pressed; 0 otherwise */
+ __u16 keycode; /* KEY_* from linux/input.h */
+};
+
+union xenkbd_in_event
+{
+ __u8 type;
+ struct xenkbd_motion motion;
+ struct xenkbd_button button;
+ struct xenkbd_key key;
+ char _[40];
+};
+
+/* out events */
+
+union xenkbd_out_event
+{
+ __u8 type;
+ char _[40];
+};
+
+/* shared page */
+
+#define XENKBD_IN_RING_SIZE (2048 / 40)
+#define XENKBD_OUT_RING_SIZE (1024 / 40)
+
+#define XENKBD_MASK_RING(idx, ring) ((idx)%(sizeof((ring))/sizeof((ring)[0])))
+
+struct xenkbd_info
+{
+ __u8 initialized;
+ __u32 in_cons, in_prod;
+ __u32 out_cons, out_prod;
+
+ union xenkbd_in_event in[XENKBD_IN_RING_SIZE];
+ union xenkbd_out_event out[XENKBD_OUT_RING_SIZE];
+};
+
+void xenkbd_resume(void);
+
+#endif
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