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1da177e4 LT |
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); |