| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |