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