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 static struct input_dev *rpcmouse_dev; 38 39 static irqreturn_t rpcmouse_irq(int irq, void *dev_id) 40 { 41 struct input_dev *dev = dev_id; 42 short x, y, dx, dy, b; 43 44 x = (short) iomd_readl(IOMD_MOUSEX); 45 y = (short) iomd_readl(IOMD_MOUSEY); 46 b = (short) (__raw_readl(0xe0310000) ^ 0x70); 47 48 dx = x - rpcmouse_lastx; 49 dy = y - rpcmouse_lasty; 50 51 rpcmouse_lastx = x; 52 rpcmouse_lasty = y; 53 54 input_report_rel(dev, REL_X, dx); 55 input_report_rel(dev, REL_Y, -dy); 56 57 input_report_key(dev, BTN_LEFT, b & 0x40); 58 input_report_key(dev, BTN_MIDDLE, b & 0x20); 59 input_report_key(dev, BTN_RIGHT, b & 0x10); 60 61 input_sync(dev); 62 63 return IRQ_HANDLED; 64 } 65 66 67 static int __init rpcmouse_init(void) 68 { 69 int err; 70 71 rpcmouse_dev = input_allocate_device(); 72 if (!rpcmouse_dev) 73 return -ENOMEM; 74 75 rpcmouse_dev->name = "Acorn RiscPC Mouse"; 76 rpcmouse_dev->phys = "rpcmouse/input0"; 77 rpcmouse_dev->id.bustype = BUS_HOST; 78 rpcmouse_dev->id.vendor = 0x0005; 79 rpcmouse_dev->id.product = 0x0001; 80 rpcmouse_dev->id.version = 0x0100; 81 82 rpcmouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL); 83 rpcmouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT); 84 rpcmouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y); 85 86 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX); 87 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY); 88 89 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) { 90 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n"); 91 err = -EBUSY; 92 goto err_free_dev; 93 } 94 95 err = input_register_device(rpcmouse_dev); 96 if (err) 97 goto err_free_irq; 98 99 return 0; 100 101 err_free_irq: 102 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); 103 err_free_dev: 104 input_free_device(rpcmouse_dev); 105 106 return err; 107 } 108 109 static void __exit rpcmouse_exit(void) 110 { 111 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); 112 input_unregister_device(rpcmouse_dev); 113 } 114 115 module_init(rpcmouse_init); 116 module_exit(rpcmouse_exit); 117