1 files changed, 86 insertions, 0 deletions
diff --git a/drivers/acorn/char/mouse_rpc.c b/drivers/acorn/char/mouse_rpc.c
new file mode 100644
index 000000000..a5c2b2bff
--- /dev/null
+++ b/drivers/acorn/char/mouse_rpc.c
@@ -0,0 +1,86 @@
+/*
+ * linux/drivers/char/rpcmouse.c
+ *
+ * Copyright (C) 1996-1998 Russell King
+ *
+ * This handles the Acorn RiscPCs mouse.  We basically have a couple
+ * of hardware registers that track the sensor count for the X-Y movement
+ * and another register holding the button state.  On every VSYNC interrupt
+ * we read the complete state and then work out if something has changed.
+ */
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/interrupt.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include "../../char/mouse.h"
+
+static short old_x, old_y, old_b;
+static int mousedev;
+
+void
+mouse_rpc_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	short x, y, dx, dy;
+	int buttons;
+
+	x = (short)inl(IOMD_MOUSEX);
+	y = (short)inl(IOMD_MOUSEY);
+	buttons = (inl (0x800C4000) >> 4) & 7;
+
+	dx = x - old_x;
+	old_x = x;
+	dy = y - old_y;
+	old_y = y;
+
+	if (dx || dy || buttons != old_b) {
+		busmouse_add_movementbuttons(mousedev, dx, dy, buttons);
+		old_b = buttons;
+	}
+}
+
+static struct busmouse rpcmouse = {
+	6, "arcmouse", NULL, NULL, 7
+};
+
+int
+mouse_rpc_init(void)
+{
+	mousedev = register_busmouse(&rpcmouse);
+
+	if (mousedev < 0)
+		printk("rpcmouse: could not register mouse driver\n");
+	else {
+		old_x = (short)inl(IOMD_MOUSEX);
+		old_y = (short)inl(IOMD_MOUSEY);
+		old_b = (inl (0x800C4000) >> 4) & 7;
+		if (request_irq(IRQ_VSYNCPULSE, mouse_rpc_irq, SA_SHIRQ, "mouse", &mousedev)) {
+			printk("rpcmouse: unable to allocate VSYNC interrupt\n");
+			unregister_busmouse(mousedev);
+			mousedev = -1;
+		}
+	}
+
+	return mousedev >= 0 ? 0 : -ENODEV;
+}
+
+#ifdef MODULE
+int
+init_module(void)
+{
+	return mouse_rpc_init();
+}
+
+int
+cleanup_module(void)
+{
+	if (mousedev >= 0) {
+		unregister_busmouse(mousedev);
+		free_irq(IRQ_VSYNCPULSE, &mousedev);
+	}
+}
+#endif