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
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
31 MODULE_LICENSE("GPL");
32
33 #define PC110PAD_OFF 0x30
34 #define PC110PAD_ON 0x38
35
36 static int pc110pad_irq = 10;
37 static int pc110pad_io = 0x15e0;
38
39 static struct input_dev *pc110pad_dev;
40 static int pc110pad_data[3];
41 static int pc110pad_count;
42
pc110pad_interrupt(int irq,void * ptr)43 static 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
pc110pad_close(struct input_dev * dev)71 static void pc110pad_close(struct input_dev *dev)
72 {
73 outb(PC110PAD_OFF, pc110pad_io + 2);
74 }
75
pc110pad_open(struct input_dev * dev)76 static 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 */
pc110pad_init(void)93 static 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
pc110pad_exit(void)154 static 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
162 module_init(pc110pad_init);
163 module_exit(pc110pad_exit);
164
