cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pc110pad.c (3805B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright (c) 2000-2001 Vojtech Pavlik
      4 *
      5 *  Based on the work of:
      6 *	Alan Cox	Robin O'Leary
      7 */
      8
      9/*
     10 * IBM PC110 touchpad driver for Linux
     11 */
     12
     13/*
     14 */
     15
     16#include <linux/module.h>
     17#include <linux/kernel.h>
     18#include <linux/errno.h>
     19#include <linux/ioport.h>
     20#include <linux/input.h>
     21#include <linux/init.h>
     22#include <linux/interrupt.h>
     23#include <linux/pci.h>
     24#include <linux/delay.h>
     25
     26#include <asm/io.h>
     27#include <asm/irq.h>
     28
     29MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
     30MODULE_DESCRIPTION("IBM PC110 touchpad driver");
     31MODULE_LICENSE("GPL");
     32
     33#define PC110PAD_OFF	0x30
     34#define PC110PAD_ON	0x38
     35
     36static int pc110pad_irq = 10;
     37static int pc110pad_io = 0x15e0;
     38
     39static struct input_dev *pc110pad_dev;
     40static int pc110pad_data[3];
     41static int pc110pad_count;
     42
     43static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
     44{
     45	int value     = inb_p(pc110pad_io);
     46	int handshake = inb_p(pc110pad_io + 2);
     47
     48	outb(handshake |  1, pc110pad_io + 2);
     49	udelay(2);
     50	outb(handshake & ~1, pc110pad_io + 2);
     51	udelay(2);
     52	inb_p(0x64);
     53
     54	pc110pad_data[pc110pad_count++] = value;
     55
     56	if (pc110pad_count < 3)
     57		return IRQ_HANDLED;
     58
     59	input_report_key(pc110pad_dev, BTN_TOUCH,
     60		pc110pad_data[0] & 0x01);
     61	input_report_abs(pc110pad_dev, ABS_X,
     62		pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
     63	input_report_abs(pc110pad_dev, ABS_Y,
     64		pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
     65	input_sync(pc110pad_dev);
     66
     67	pc110pad_count = 0;
     68	return IRQ_HANDLED;
     69}
     70
     71static void pc110pad_close(struct input_dev *dev)
     72{
     73	outb(PC110PAD_OFF, pc110pad_io + 2);
     74}
     75
     76static int pc110pad_open(struct input_dev *dev)
     77{
     78	pc110pad_interrupt(0, NULL);
     79	pc110pad_interrupt(0, NULL);
     80	pc110pad_interrupt(0, NULL);
     81	outb(PC110PAD_ON, pc110pad_io + 2);
     82	pc110pad_count = 0;
     83
     84	return 0;
     85}
     86
     87/*
     88 * We try to avoid enabling the hardware if it's not
     89 * there, but we don't know how to test. But we do know
     90 * that the PC110 is not a PCI system. So if we find any
     91 * PCI devices in the machine, we don't have a PC110.
     92 */
     93static int __init pc110pad_init(void)
     94{
     95	int err;
     96
     97	if (!no_pci_devices())
     98		return -ENODEV;
     99
    100	if (!request_region(pc110pad_io, 4, "pc110pad")) {
    101		printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
    102				pc110pad_io, pc110pad_io + 4);
    103		return -EBUSY;
    104	}
    105
    106	outb(PC110PAD_OFF, pc110pad_io + 2);
    107
    108	if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
    109		printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
    110		err = -EBUSY;
    111		goto err_release_region;
    112	}
    113
    114	pc110pad_dev = input_allocate_device();
    115	if (!pc110pad_dev) {
    116		printk(KERN_ERR "pc110pad: Not enough memory.\n");
    117		err = -ENOMEM;
    118		goto err_free_irq;
    119	}
    120
    121	pc110pad_dev->name = "IBM PC110 TouchPad";
    122	pc110pad_dev->phys = "isa15e0/input0";
    123	pc110pad_dev->id.bustype = BUS_ISA;
    124	pc110pad_dev->id.vendor = 0x0003;
    125	pc110pad_dev->id.product = 0x0001;
    126	pc110pad_dev->id.version = 0x0100;
    127
    128	pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
    129	pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
    130	pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
    131
    132	input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
    133	input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
    134
    135	pc110pad_dev->open = pc110pad_open;
    136	pc110pad_dev->close = pc110pad_close;
    137
    138	err = input_register_device(pc110pad_dev);
    139	if (err)
    140		goto err_free_dev;
    141
    142	return 0;
    143
    144 err_free_dev:
    145	input_free_device(pc110pad_dev);
    146 err_free_irq:
    147	free_irq(pc110pad_irq, NULL);
    148 err_release_region:
    149	release_region(pc110pad_io, 4);
    150
    151	return err;
    152}
    153
    154static void __exit pc110pad_exit(void)
    155{
    156	outb(PC110PAD_OFF, pc110pad_io + 2);
    157	free_irq(pc110pad_irq, NULL);
    158	input_unregister_device(pc110pad_dev);
    159	release_region(pc110pad_io, 4);
    160}
    161
    162module_init(pc110pad_init);
    163module_exit(pc110pad_exit);