1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Acorn RiscPC mouse driver for Linux/ARM 4 * 5 * Copyright (c) 2000-2002 Vojtech Pavlik 6 * Copyright (C) 1996-2002 Russell King 7 */ 8 9 /* 10 * 11 * This handles the Acorn RiscPCs mouse. We basically have a couple of 12 * hardware registers that track the sensor count for the X-Y movement and 13 * another register holding the button state. On every VSYNC interrupt we read 14 * the complete state and then work out if something has changed. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/ptrace.h> 19 #include <linux/interrupt.h> 20 #include <linux/init.h> 21 #include <linux/input.h> 22 #include <linux/io.h> 23 24 #include <mach/hardware.h> 25 #include <asm/irq.h> 26 #include <asm/hardware/iomd.h> 27 28 MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 29 MODULE_DESCRIPTION("Acorn RiscPC mouse driver"); 30 MODULE_LICENSE("GPL"); 31 32 static short rpcmouse_lastx, rpcmouse_lasty; 33 static struct input_dev *rpcmouse_dev; 34 35 static irqreturn_t rpcmouse_irq(int irq, void *dev_id) 36 { 37 struct input_dev *dev = dev_id; 38 short x, y, dx, dy, b; 39 40 x = (short) iomd_readl(IOMD_MOUSEX); 41 y = (short) iomd_readl(IOMD_MOUSEY); 42 b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70); 43 44 dx = x - rpcmouse_lastx; 45 dy = y - rpcmouse_lasty; 46 47 rpcmouse_lastx = x; 48 rpcmouse_lasty = y; 49 50 input_report_rel(dev, REL_X, dx); 51 input_report_rel(dev, REL_Y, -dy); 52 53 input_report_key(dev, BTN_LEFT, b & 0x40); 54 input_report_key(dev, BTN_MIDDLE, b & 0x20); 55 input_report_key(dev, BTN_RIGHT, b & 0x10); 56 57 input_sync(dev); 58 59 return IRQ_HANDLED; 60 } 61 62 63 static int __init rpcmouse_init(void) 64 { 65 int err; 66 67 rpcmouse_dev = input_allocate_device(); 68 if (!rpcmouse_dev) 69 return -ENOMEM; 70 71 rpcmouse_dev->name = "Acorn RiscPC Mouse"; 72 rpcmouse_dev->phys = "rpcmouse/input0"; 73 rpcmouse_dev->id.bustype = BUS_HOST; 74 rpcmouse_dev->id.vendor = 0x0005; 75 rpcmouse_dev->id.product = 0x0001; 76 rpcmouse_dev->id.version = 0x0100; 77 78 rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 79 rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) | 80 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT); 81 rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y); 82 83 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX); 84 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY); 85 86 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) { 87 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n"); 88 err = -EBUSY; 89 goto err_free_dev; 90 } 91 92 err = input_register_device(rpcmouse_dev); 93 if (err) 94 goto err_free_irq; 95 96 return 0; 97 98 err_free_irq: 99 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); 100 err_free_dev: 101 input_free_device(rpcmouse_dev); 102 103 return err; 104 } 105 106 static void __exit rpcmouse_exit(void) 107 { 108 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev); 109 input_unregister_device(rpcmouse_dev); 110 } 111 112 module_init(rpcmouse_init); 113 module_exit(rpcmouse_exit); 114