Here's a patch that makes the RiscPC input bits work in 2.5:

- Call the RiscPC mouse "CONFIG_MOUSE_RISCPC" not "CONFIG_MOUSE_ACORN"
- Remember the last state of the buttons so we're not continuously
  reporting this to the core input subsystem.
- Correct mapping of bits to buttons
- Correct button sense (1 = released)
- Always pass a dev_id when requesting an IRQ.  Required for SA_SHIRQ
  shared interrupts.
- Merge ARM keyboard controller config options
- General update for rpckbd.c

drivers/input/mouse/Config.help

@@ -77,7 +77,7 @@ CONFIG_MOUSE_AMIGA
   The module will be called amimouse.o. If you want to compile it as a
   module, say M here and read <file.:Documentation/modules.txt>.
 
-CONFIG_MOUSE_ACORN
+CONFIG_MOUSE_RISCPC
   Say Y here if you have the Acorn RiscPC computer and want its
   native mouse supported.
 

drivers/input/mouse/Config.in

@@ -20,5 +20,5 @@ if [ "$CONFIG_AMIGA" = "y" ]; then
    dep_tristate '  Amiga mouse' CONFIG_MOUSE_AMIGA $CONFIG_INPUT $CONFIG_INPUT_MOUSE
 fi
 if [ "$CONFIG_ARCH_ACORN" = "y" ]; then
-   dep_tristate '  Acorn RiscPC mouse' CONFIG_MOUSE_ACORN $CONFIG_INPUT $CONFIG_INPUT_MOUSE
+   dep_tristate '  Acorn RiscPC mouse' CONFIG_MOUSE_RISCPC $CONFIG_INPUT $CONFIG_INPUT_MOUSE
 fi

drivers/input/mouse/Makefile

@@ -5,7 +5,7 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_MOUSE_AMIGA)	+= amimouse.o
-obj-$(CONFIG_MOUSE_ACORN)	+= rpcmouse.o
+obj-$(CONFIG_MOUSE_RISCPC)	+= rpcmouse.o
 obj-$(CONFIG_MOUSE_INPORT)	+= inport.o
 obj-$(CONFIG_MOUSE_LOGIBM)	+= logibm.o
 obj-$(CONFIG_MOUSE_MAPLE)	+= maplemouse.o

drivers/input/mouse/rpcmouse.c

@@ -34,6 +34,7 @@ MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
 MODULE_LICENSE("GPL");
 
 static short rpcmouse_lastx, rpcmouse_lasty;
+static unsigned int rpcmouse_lastb;
 
 static struct input_dev rpcmouse_dev = {
 	.evbit	= { BIT(EV_KEY) | BIT(EV_REL) },
@@ -51,11 +52,12 @@ static struct input_dev rpcmouse_dev = {
 
 static void rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs)
 {
-	short x, y, dx, dy, b;
+	struct input_dev *dev = dev_id;
+	short x, y, dx, dy;
+	unsigned int b;
 
 	x = (short) iomd_readl(IOMD_MOUSEX);
 	y = (short) iomd_readl(IOMD_MOUSEY);
-	b = (short) (__raw_readl(0xe0310000) >> 4) & 7;
 
 	dx = x - rpcmouse_lastx;
 	dy = y - rpcmouse_lasty; 
@@ -63,14 +65,22 @@ static void rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs)
 	rpcmouse_lastx = x;
 	rpcmouse_lasty = y;
 
-	input_report_rel(&rpcmouse_dev, REL_X, dx);
-	input_report_rel(&rpcmouse_dev, REL_Y, dy);
+	if (dx)
+		input_report_rel(dev, REL_X, dx);
+	if (dy)
+		input_report_rel(dev, REL_Y, -dy);
 
-	input_report_key(&rpcmouse_dev, BTN_LEFT,   b & 0x10);
-	input_report_key(&rpcmouse_dev, BTN_MIDDLE, b & 0x20);
-	input_report_key(&rpcmouse_dev, BTN_RIGHT,  b & 0x40);
+	b = __raw_readl(0xe0310000) ^ 0x70;
+	if (b != rpcmouse_lastb) {
+		input_report_key(dev, BTN_LEFT,   b & 0x40);
+		input_report_key(dev, BTN_MIDDLE, b & 0x20);
+		input_report_key(dev, BTN_RIGHT,  b & 0x10);
+	}
+
+	if (b != rpcmouse_lastb || dx || dy)
+		input_sync(dev);
 
-	input_sync(&rpcmouse_dev);
+	rpcmouse_lastb = b;
 }
 
 static int __init rpcmouse_init(void)
@@ -80,7 +90,7 @@ static int __init rpcmouse_init(void)
 	rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
 	rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
 
-	if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", NULL)) {
+	if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", &rpcmouse_dev)) {
 		printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
 		return -1;
 	}

drivers/input/serio/Config.in

@@ -12,12 +12,8 @@ if [ "$CONFIG_Q40" = "y" ]; then
 fi
 dep_tristate '  Parallel port keyboard adapter' CONFIG_SERIO_PARKBD $CONFIG_SERIO $CONFIG_PARPORT
 
-if [ "$CONFIG_ARCH_ACORN" = "y" ]; then
-   dep_tristate '  Acorn RiscPC keyboard controller' CONFIG_SERIO_ACORN $CONFIG_SERIO
-fi
-if [ "$CONFIG_ARCH_INTEGRATOR" = "y" ]; then
-   dep_tristate '  AMBA KMI keyboard controller' CONFIG_SERIO_AMBAKMI $CONFIG_SERIO
-fi
-if [ "$CONFIG_SA1111" = "y" ]; then
-   dep_tristate '  Intel SA1111 keyboard controller' CONFIG_SERIO_SA1111 $CONFIG_SERIO
+if [ "$CONFIG_ARM" = "y" ]; then
+   dep_tristate '  Acorn RiscPC keyboard controller' CONFIG_SERIO_RPCKBD $CONFIG_SERIO $CONFIG_ARCH_RPC
+   dep_tristate '  AMBA KMI keyboard controller' CONFIG_SERIO_AMBAKMI $CONFIG_SERIO $CONFIG_ARCH_INTEGRATOR
+   dep_tristate '  Intel SA1111 keyboard controller' CONFIG_SERIO_SA1111 $CONFIG_SERIO $CONFIG_SA1111
 fi

drivers/input/serio/rpckbd.c

@@ -4,7 +4,9 @@
  *  Copyright (c) 2000-2001 Vojtech Pavlik
  *
  *  Based on the work of:
- *	unknown author
+ *	Russell King (thanks)
+ *
+ * Fixes by Russell King.
  */
 
 /*
@@ -32,44 +34,42 @@
  */
 
 #include <linux/module.h>
+#include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/serio.h>
 
 #include <asm/irq.h>
 #include <asm/hardware.h>
 #include <asm/io.h>
-#include <asm/iomd.h>
+#include <asm/hardware/iomd.h>
 #include <asm/system.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
 MODULE_LICENSE("GPL");
 
-static inline void rpckbd_write(unsigned char val)
+extern struct pt_regs *kbd_pt_regs;
+
+static int rpckbd_write(struct serio *port, unsigned char val)
 {
 	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
 		cpu_relax();
 
 	iomd_writeb(val, IOMD_KARTTX);
-}
 
-static struct serio rpckbd_port =
-{
-	.type	= SERIO_8042,
-	.write	= rpckbd_write,
-	.name	= "RiscPC PS/2 kbd port",
-	.phys	= "rpckbd/serio0",
-};
+	return 0;
+}
 
 static void rpckbd_rx(int irq, void *dev_id, struct pt_regs *regs)
 {
+	struct serio *port = dev_id;
 	unsigned int byte;
 	kbd_pt_regs = regs;
 
 	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
 		byte = iomd_readb(IOMD_KARTRX);
 
-		serio_interrupt(&rpckbd_port, byte, 0);
+		serio_interrupt(port, byte, 0);
 	}
 }
 
@@ -77,34 +77,52 @@ static void rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs)
 {
 }
 
-static int __init rpckbd_init(void)
+static int rpckbd_open(struct serio *port)
 {
 	/* Reset the keyboard state machine. */
 	iomd_writeb(0, IOMD_KCTRL);
 	iomd_writeb(8, IOMD_KCTRL);
 	iomd_readb(IOMD_KARTRX);
 
-	if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", NULL) != 0) {
-		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ!\n")
+	if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
+		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ!\n");
 		return -EBUSY;
 	}
 
-	if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", NULL) != 0) {
-		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ!\n")
+	if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
+		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ!\n");
 		free_irq(IRQ_KEYBOARDRX, NULL);
 		return -EBUSY;
 	}
 
-	register_serio_port(&rpckbd_port);
 	return 0;
 }
 
-static void __exit rpckbd_exit(void)
+static void rpckbd_close(struct serio *port)
 {
-	free_irq(IRQ_KEYBOARDRX, NULL);
-	free_irq(IRQ_KEYBOARDTX, NULL);	
+	free_irq(IRQ_KEYBOARDRX, port);
+	free_irq(IRQ_KEYBOARDTX, port);	
+}
 
-	unregister_serio_port(&rpckbd_port);
+static struct serio rpckbd_port =
+{
+	.type	= SERIO_8042,
+	.open	= rpckbd_open,
+	.close	= rpckbd_close,
+	.write	= rpckbd_write,
+	.name 	= "RiscPC PS/2 kbd port",
+	.phys	= "rpckbd/serio0",
+};
+
+static int __init rpckbd_init(void)
+{
+	serio_register_port(&rpckbd_port);
+	return 0;
+}
+
+static void __exit rpckbd_exit(void)
+{
+	serio_unregister_port(&rpckbd_port);
 }
 
 module_init(rpckbd_init);