1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2000-2001 Vojtech Pavlik
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Based on the work of:
6*4882a593Smuzhiyun * Alan Cox Robin O'Leary
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun * IBM PC110 touchpad driver for Linux
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <linux/module.h>
17*4882a593Smuzhiyun #include <linux/kernel.h>
18*4882a593Smuzhiyun #include <linux/errno.h>
19*4882a593Smuzhiyun #include <linux/ioport.h>
20*4882a593Smuzhiyun #include <linux/input.h>
21*4882a593Smuzhiyun #include <linux/init.h>
22*4882a593Smuzhiyun #include <linux/interrupt.h>
23*4882a593Smuzhiyun #include <linux/pci.h>
24*4882a593Smuzhiyun #include <linux/delay.h>
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #include <asm/io.h>
27*4882a593Smuzhiyun #include <asm/irq.h>
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30*4882a593Smuzhiyun MODULE_DESCRIPTION("IBM PC110 touchpad driver");
31*4882a593Smuzhiyun MODULE_LICENSE("GPL");
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #define PC110PAD_OFF 0x30
34*4882a593Smuzhiyun #define PC110PAD_ON 0x38
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun static int pc110pad_irq = 10;
37*4882a593Smuzhiyun static int pc110pad_io = 0x15e0;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static struct input_dev *pc110pad_dev;
40*4882a593Smuzhiyun static int pc110pad_data[3];
41*4882a593Smuzhiyun static int pc110pad_count;
42*4882a593Smuzhiyun
pc110pad_interrupt(int irq,void * ptr)43*4882a593Smuzhiyun static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun int value = inb_p(pc110pad_io);
46*4882a593Smuzhiyun int handshake = inb_p(pc110pad_io + 2);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun outb(handshake | 1, pc110pad_io + 2);
49*4882a593Smuzhiyun udelay(2);
50*4882a593Smuzhiyun outb(handshake & ~1, pc110pad_io + 2);
51*4882a593Smuzhiyun udelay(2);
52*4882a593Smuzhiyun inb_p(0x64);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun pc110pad_data[pc110pad_count++] = value;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if (pc110pad_count < 3)
57*4882a593Smuzhiyun return IRQ_HANDLED;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun input_report_key(pc110pad_dev, BTN_TOUCH,
60*4882a593Smuzhiyun pc110pad_data[0] & 0x01);
61*4882a593Smuzhiyun input_report_abs(pc110pad_dev, ABS_X,
62*4882a593Smuzhiyun pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
63*4882a593Smuzhiyun input_report_abs(pc110pad_dev, ABS_Y,
64*4882a593Smuzhiyun pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
65*4882a593Smuzhiyun input_sync(pc110pad_dev);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun pc110pad_count = 0;
68*4882a593Smuzhiyun return IRQ_HANDLED;
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun
pc110pad_close(struct input_dev * dev)71*4882a593Smuzhiyun static void pc110pad_close(struct input_dev *dev)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun outb(PC110PAD_OFF, pc110pad_io + 2);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
pc110pad_open(struct input_dev * dev)76*4882a593Smuzhiyun static int pc110pad_open(struct input_dev *dev)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun pc110pad_interrupt(0, NULL);
79*4882a593Smuzhiyun pc110pad_interrupt(0, NULL);
80*4882a593Smuzhiyun pc110pad_interrupt(0, NULL);
81*4882a593Smuzhiyun outb(PC110PAD_ON, pc110pad_io + 2);
82*4882a593Smuzhiyun pc110pad_count = 0;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun return 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun /*
88*4882a593Smuzhiyun * We try to avoid enabling the hardware if it's not
89*4882a593Smuzhiyun * there, but we don't know how to test. But we do know
90*4882a593Smuzhiyun * that the PC110 is not a PCI system. So if we find any
91*4882a593Smuzhiyun * PCI devices in the machine, we don't have a PC110.
92*4882a593Smuzhiyun */
pc110pad_init(void)93*4882a593Smuzhiyun static int __init pc110pad_init(void)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun int err;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (!no_pci_devices())
98*4882a593Smuzhiyun return -ENODEV;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun if (!request_region(pc110pad_io, 4, "pc110pad")) {
101*4882a593Smuzhiyun printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
102*4882a593Smuzhiyun pc110pad_io, pc110pad_io + 4);
103*4882a593Smuzhiyun return -EBUSY;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun outb(PC110PAD_OFF, pc110pad_io + 2);
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
109*4882a593Smuzhiyun printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
110*4882a593Smuzhiyun err = -EBUSY;
111*4882a593Smuzhiyun goto err_release_region;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun pc110pad_dev = input_allocate_device();
115*4882a593Smuzhiyun if (!pc110pad_dev) {
116*4882a593Smuzhiyun printk(KERN_ERR "pc110pad: Not enough memory.\n");
117*4882a593Smuzhiyun err = -ENOMEM;
118*4882a593Smuzhiyun goto err_free_irq;
119*4882a593Smuzhiyun }
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun pc110pad_dev->name = "IBM PC110 TouchPad";
122*4882a593Smuzhiyun pc110pad_dev->phys = "isa15e0/input0";
123*4882a593Smuzhiyun pc110pad_dev->id.bustype = BUS_ISA;
124*4882a593Smuzhiyun pc110pad_dev->id.vendor = 0x0003;
125*4882a593Smuzhiyun pc110pad_dev->id.product = 0x0001;
126*4882a593Smuzhiyun pc110pad_dev->id.version = 0x0100;
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
129*4882a593Smuzhiyun pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
130*4882a593Smuzhiyun pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
133*4882a593Smuzhiyun input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
134*4882a593Smuzhiyun
135*4882a593Smuzhiyun pc110pad_dev->open = pc110pad_open;
136*4882a593Smuzhiyun pc110pad_dev->close = pc110pad_close;
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun err = input_register_device(pc110pad_dev);
139*4882a593Smuzhiyun if (err)
140*4882a593Smuzhiyun goto err_free_dev;
141*4882a593Smuzhiyun
142*4882a593Smuzhiyun return 0;
143*4882a593Smuzhiyun
144*4882a593Smuzhiyun err_free_dev:
145*4882a593Smuzhiyun input_free_device(pc110pad_dev);
146*4882a593Smuzhiyun err_free_irq:
147*4882a593Smuzhiyun free_irq(pc110pad_irq, NULL);
148*4882a593Smuzhiyun err_release_region:
149*4882a593Smuzhiyun release_region(pc110pad_io, 4);
150*4882a593Smuzhiyun
151*4882a593Smuzhiyun return err;
152*4882a593Smuzhiyun }
153*4882a593Smuzhiyun
pc110pad_exit(void)154*4882a593Smuzhiyun static void __exit pc110pad_exit(void)
155*4882a593Smuzhiyun {
156*4882a593Smuzhiyun outb(PC110PAD_OFF, pc110pad_io + 2);
157*4882a593Smuzhiyun free_irq(pc110pad_irq, NULL);
158*4882a593Smuzhiyun input_unregister_device(pc110pad_dev);
159*4882a593Smuzhiyun release_region(pc110pad_io, 4);
160*4882a593Smuzhiyun }
161*4882a593Smuzhiyun
162*4882a593Smuzhiyun module_init(pc110pad_init);
163*4882a593Smuzhiyun module_exit(pc110pad_exit);
164