1 /*
2 * $Id: pc110pad.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $
3 *
4 * Copyright (c) 2000-2001 Vojtech Pavlik
5 *
6 * Based on the work of:
7 * Alan Cox Robin O'Leary
8 */
9
10 /*
11 * IBM PC110 touchpad driver for Linux
12 */
13
14 /*
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 * Should you need to contact me, the author, you can do so either by
30 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
31 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
32 */
33
34 #include <linux/module.h>
35 #include <linux/kernel.h>
36 #include <linux/errno.h>
37 #include <linux/ioport.h>
38 #include <linux/input.h>
39 #include <linux/init.h>
40 #include <linux/interrupt.h>
41 #include <linux/pci.h>
42
43 #include <asm/io.h>
44 #include <asm/irq.h>
45
46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
47 MODULE_DESCRIPTION("IBM PC110 touchpad driver");
48 MODULE_LICENSE("GPL");
49
50 #define PC110PAD_OFF 0x30
51 #define PC110PAD_ON 0x38
52
53 static int pc110pad_irq = 10;
54 static int pc110pad_io = 0x15e0;
55
56 static struct input_dev pc110pad_dev;
57 static int pc110pad_data[3];
58 static int pc110pad_count;
59 static int pc110pad_used;
60
61 static char *pc110pad_name = "IBM PC110 TouchPad";
62 static char *pc110pad_phys = "isa15e0/input0";
63
64 static irqreturn_t pc110pad_interrupt(int irq, void *ptr, struct pt_regs *regs)
65 {
66 int value = inb_p(pc110pad_io);
67 int handshake = inb_p(pc110pad_io + 2);
68
69 outb_p(handshake | 1, pc110pad_io + 2);
70 outb_p(handshake & ~1, pc110pad_io + 2);
71 inb_p(0x64);
72
73 pc110pad_data[pc110pad_count++] = value;
74
75 if (pc110pad_count < 3)
76 return IRQ_HANDLED;
77
78 input_regs(&pc110pad_dev, regs);
79 input_report_key(&pc110pad_dev, BTN_TOUCH,
80 pc110pad_data[0] & 0x01);
81 input_report_abs(&pc110pad_dev, ABS_X,
82 pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
83 input_report_abs(&pc110pad_dev, ABS_Y,
84 pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
85 input_sync(&pc110pad_dev);
86
87 pc110pad_count = 0;
88 return IRQ_HANDLED;
89 }
90
91 static void pc110pad_close(struct input_dev *dev)
92 {
93 if (!--pc110pad_used)
94 outb(PC110PAD_OFF, pc110pad_io + 2);
95 }
96
97 static int pc110pad_open(struct input_dev *dev)
98 {
99 if (pc110pad_used++)
100 return 0;
101
102 pc110pad_interrupt(0,NULL,NULL);
103 pc110pad_interrupt(0,NULL,NULL);
104 pc110pad_interrupt(0,NULL,NULL);
105 outb(PC110PAD_ON, pc110pad_io + 2);
106 pc110pad_count = 0;
107
108 return 0;
109 }
110
111 /*
112 * We try to avoid enabling the hardware if it's not
113 * there, but we don't know how to test. But we do know
114 * that the PC110 is not a PCI system. So if we find any
115 * PCI devices in the machine, we don't have a PC110.
116 */
117 static int __init pc110pad_init(void)
118 {
119 struct pci_dev *dev;
120
121 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
122 if (dev) {
123 pci_dev_put(dev);
124 return -ENOENT;
125 }
126
127 if (!request_region(pc110pad_io, 4, "pc110pad")) {
128 printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
129 pc110pad_io, pc110pad_io + 4);
130 return -EBUSY;
131 }
132
133 outb(PC110PAD_OFF, pc110pad_io + 2);
134
135 if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL))
136 {
137 release_region(pc110pad_io, 4);
138 printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
139 return -EBUSY;
140 }
141
142 pc110pad_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
143 pc110pad_dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
144 pc110pad_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
145
146 pc110pad_dev.absmax[ABS_X] = 0x1ff;
147 pc110pad_dev.absmax[ABS_Y] = 0x0ff;
148
149 pc110pad_dev.open = pc110pad_open;
150 pc110pad_dev.close = pc110pad_close;
151
152 pc110pad_dev.name = pc110pad_name;
153 pc110pad_dev.phys = pc110pad_phys;
154 pc110pad_dev.id.bustype = BUS_ISA;
155 pc110pad_dev.id.vendor = 0x0003;
156 pc110pad_dev.id.product = 0x0001;
157 pc110pad_dev.id.version = 0x0100;
158
159 input_register_device(&pc110pad_dev);
160
161 printk(KERN_INFO "input: %s at %#x irq %d\n",
162 pc110pad_name, pc110pad_io, pc110pad_irq);
163
164 return 0;
165 }
166
167 static void __exit pc110pad_exit(void)
168 {
169 input_unregister_device(&pc110pad_dev);
170
171 outb(PC110PAD_OFF, pc110pad_io + 2);
172
173 free_irq(pc110pad_irq, NULL);
174 release_region(pc110pad_io, 4);
175 }
176
177 module_init(pc110pad_init);
178 module_exit(pc110pad_exit);
179
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