161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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*
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* Based on the work of:
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* Alan Cox Robin O'Leary
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*/
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/*
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* IBM PC110 touchpad driver for Linux
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/input.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("IBM PC110 touchpad driver");
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MODULE_LICENSE("GPL");
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#define PC110PAD_OFF 0x30
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#define PC110PAD_ON 0x38
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static int pc110pad_irq = 10;
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static int pc110pad_io = 0x15e0;
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static struct input_dev *pc110pad_dev;
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static int pc110pad_data[3];
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static int pc110pad_count;
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static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
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{
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int value = inb_p(pc110pad_io);
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int handshake = inb_p(pc110pad_io + 2);
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outb(handshake | 1, pc110pad_io + 2);
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udelay(2);
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outb(handshake & ~1, pc110pad_io + 2);
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udelay(2);
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inb_p(0x64);
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pc110pad_data[pc110pad_count++] = value;
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if (pc110pad_count < 3)
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return IRQ_HANDLED;
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input_report_key(pc110pad_dev, BTN_TOUCH,
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pc110pad_data[0] & 0x01);
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input_report_abs(pc110pad_dev, ABS_X,
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pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
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input_report_abs(pc110pad_dev, ABS_Y,
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pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
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input_sync(pc110pad_dev);
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pc110pad_count = 0;
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return IRQ_HANDLED;
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}
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static void pc110pad_close(struct input_dev *dev)
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{
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outb(PC110PAD_OFF, pc110pad_io + 2);
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}
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static int pc110pad_open(struct input_dev *dev)
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{
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pc110pad_interrupt(0, NULL);
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pc110pad_interrupt(0, NULL);
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pc110pad_interrupt(0, NULL);
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outb(PC110PAD_ON, pc110pad_io + 2);
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pc110pad_count = 0;
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return 0;
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}
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/*
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* We try to avoid enabling the hardware if it's not
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* there, but we don't know how to test. But we do know
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* that the PC110 is not a PCI system. So if we find any
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* PCI devices in the machine, we don't have a PC110.
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*/
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static int __init pc110pad_init(void)
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{
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int err;
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if (!no_pci_devices())
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return -ENODEV;
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if (!request_region(pc110pad_io, 4, "pc110pad")) {
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printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
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pc110pad_io, pc110pad_io + 4);
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return -EBUSY;
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}
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outb(PC110PAD_OFF, pc110pad_io + 2);
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if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
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printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
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err = -EBUSY;
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goto err_release_region;
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}
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pc110pad_dev = input_allocate_device();
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if (!pc110pad_dev) {
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printk(KERN_ERR "pc110pad: Not enough memory.\n");
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err = -ENOMEM;
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goto err_free_irq;
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}
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pc110pad_dev->name = "IBM PC110 TouchPad";
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pc110pad_dev->phys = "isa15e0/input0";
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pc110pad_dev->id.bustype = BUS_ISA;
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pc110pad_dev->id.vendor = 0x0003;
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pc110pad_dev->id.product = 0x0001;
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pc110pad_dev->id.version = 0x0100;
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pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
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pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
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input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
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pc110pad_dev->open = pc110pad_open;
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pc110pad_dev->close = pc110pad_close;
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err = input_register_device(pc110pad_dev);
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if (err)
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goto err_free_dev;
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return 0;
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err_free_dev:
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input_free_device(pc110pad_dev);
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err_free_irq:
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free_irq(pc110pad_irq, NULL);
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err_release_region:
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release_region(pc110pad_io, 4);
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return err;
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}
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static void __exit pc110pad_exit(void)
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{
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outb(PC110PAD_OFF, pc110pad_io + 2);
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free_irq(pc110pad_irq, NULL);
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input_unregister_device(pc110pad_dev);
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release_region(pc110pad_io, 4);
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}
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module_init(pc110pad_init);
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module_exit(pc110pad_exit);
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