[PATCH 3/4][RFC] Paravirtual Framebuffer/Keyboard

[PATCH 3/4][RFC] Paravirtual Framebuffer/Keyboard

[Anthony Liguori]

[-- Attachment #1: Type: text/plain, Size: 1 bytes --]



[-- Attachment #2: vfb-8615.diff --]
[-- Type: text/plain, Size: 7415 bytes --]

# HG changeset patch
# User Anthony Liguori <anthony@codemonkey.ws>
# 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@us.ibm.com>

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@us.ibm.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.
+ */
+
+#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@us.ibm.com>
+ *
+ *  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

[-- Attachment #3: Type: text/plain, Size: 138 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel