1 /* 2 * Acorn RiscPC mouse driver for Linux/ARM 3 * 4 * Copyright (c) 2000-2002 Vojtech Pavlik 5 * Copyright (C) 1996-2002 Russell King 6 * 7 */ 8 9 /* 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 as published by 12 * the Free Software Foundation. 13 * 14 * This handles the Acorn RiscPCs mouse. We basically have a couple of 15 * hardware registers that track the sensor count for the X-Y movement and 16 * another register holding the button state. On every VSYNC interrupt we read 17 * the complete state and then work out if something has changed. 18 */ 19 20 #include <linux/module.h> 21 #include <linux/sched.h> 22 #include <linux/ptrace.h> 23 #include <linux/interrupt.h> 24 #include <linux/init.h> 25 #include <linux/input.h> 26 27 #include <asm/hardware.h> 28 #include <asm/irq.h> 29 #include <asm/io.h> 30 #include <asm/hardware/iomd.h> 31 32 MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 33 MODULE_DESCRIPTION("Acorn RiscPC mouse driver"); 34 MODULE_LICENSE("GPL"); 35 36 static short rpcmouse_lastx, rpcmouse_lasty; 37 38 static struct input_dev rpcmouse_dev = { 39 .evbit = { BIT(EV_KEY) | BIT(EV_REL) }, 40 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT) }, 41 .relbit = { BIT(REL_X) | BIT(REL_Y) }, 42 .name = "Acorn RiscPC Mouse", 43 .phys = "rpcmouse/input0", 44 .id = { 45 .bustype = BUS_HOST, 46 .vendor = 0x0005, 47 .product = 0x0001, 48 .version = 0x0100, 49 }, 50 }; 51 52 static irqreturn_t rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs) 53 { 54 struct input_dev *dev = dev_id; 55 short x, y, dx, dy, b; 56 57 x = (short) iomd_readl(IOMD_MOUSEX); 58 y = (short) iomd_readl(IOMD_MOUSEY); 59 b = (short) (__raw_readl(0xe0310000) ^ 0x70); 60 61 dx = x - rpcmouse_lastx; 62 dy = y - rpcmouse_lasty; 63 64 rpcmouse_lastx = x; 65 rpcmouse_lasty = y; 66 67 input_regs(dev, regs); 68 69 input_report_rel(dev, REL_X, dx); 70 input_report_rel(dev, REL_Y, -dy); 71 72 input_report_key(dev, BTN_LEFT, b & 0x40); 73 input_report_key(dev, BTN_MIDDLE, b & 0x20); 74 input_report_key(dev, BTN_RIGHT, b & 0x10); 75 76 input_sync(dev); 77 78 return IRQ_HANDLED; 79 } 80 81 static int __init rpcmouse_init(void) 82 { 83 init_input_dev(&rpcmouse_dev); 84 85 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX); 86 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY); 87 88 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", &rpcmouse_dev)) { 89 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n"); 90 return -1; 91 } 92 93 input_register_device(&rpcmouse_dev); 94 95 printk(KERN_INFO "input: Acorn RiscPC mouse\n"); 96 97 return 0; 98 } 99 100 static void __exit rpcmouse_exit(void) 101 { 102 input_unregister_device(&rpcmouse_dev); 103 free_irq(IRQ_VSYNCPULSE, &rpcmouse_dev); 104 } 105 106 module_init(rpcmouse_init); 107 module_exit(rpcmouse_exit); 108