summaryrefslogtreecommitdiffstats
path: root/drivers/input/serio/ct82c710.c
blob: 4da6c86b5d76a46979104b2dcc87edadd0cde7e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/*
 * $Id: ct82c710.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 */

/*
 *  82C710 C&T mouse port chip driver for Linux
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/config.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/serio.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/platform_device.h>

#include <asm/io.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
MODULE_LICENSE("GPL");

/*
 * ct82c710 interface
 */

#define CT82C710_DEV_IDLE     0x01		/* Device Idle */
#define CT82C710_RX_FULL      0x02		/* Device Char received */
#define CT82C710_TX_IDLE      0x04		/* Device XMIT Idle */
#define CT82C710_RESET        0x08		/* Device Reset */
#define CT82C710_INTS_ON      0x10		/* Device Interrupt On */
#define CT82C710_ERROR_FLAG   0x20		/* Device Error */
#define CT82C710_CLEAR        0x40		/* Device Clear */
#define CT82C710_ENABLE       0x80		/* Device Enable */

#define CT82C710_IRQ          12

#define CT82C710_DATA         ct82c710_iores.start
#define CT82C710_STATUS       (ct82c710_iores.start + 1)

static struct serio *ct82c710_port;
static struct platform_device *ct82c710_device;
static struct resource ct82c710_iores;

/*
 * Interrupt handler for the 82C710 mouse port. A character
 * is waiting in the 82C710.
 */

static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id, struct pt_regs * regs)
{
	return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0, regs);
}

/*
 * Wait for device to send output char and flush any input char.
 */

static int ct82c170_wait(void)
{
	int timeout = 60000;

	while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE))
		       != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) {

		if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA);

		udelay(1);
		timeout--;
	}

	return !timeout;
}

static void ct82c710_close(struct serio *serio)
{
	if (ct82c170_wait())
		printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");

	outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS);

	if (ct82c170_wait())
		printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");

	free_irq(CT82C710_IRQ, NULL);
}

static int ct82c710_open(struct serio *serio)
{
	unsigned char status;

	if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL))
		return -1;

	status = inb_p(CT82C710_STATUS);

	status |= (CT82C710_ENABLE | CT82C710_RESET);
	outb_p(status, CT82C710_STATUS);

	status &= ~(CT82C710_RESET);
	outb_p(status, CT82C710_STATUS);

	status |= CT82C710_INTS_ON;
	outb_p(status, CT82C710_STATUS);	/* Enable interrupts */

	while (ct82c170_wait()) {
		printk(KERN_ERR "ct82c710: Device busy in open()\n");
		status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON);
		outb_p(status, CT82C710_STATUS);
		free_irq(CT82C710_IRQ, NULL);
		return -1;
	}

	return 0;
}

/*
 * Write to the 82C710 mouse device.
 */

static int ct82c710_write(struct serio *port, unsigned char c)
{
	if (ct82c170_wait()) return -1;
	outb_p(c, CT82C710_DATA);
	return 0;
}

/*
 * See if we can find a 82C710 device. Read mouse address.
 */

static int __init ct82c710_probe(void)
{
	outb_p(0x55, 0x2fa);				/* Any value except 9, ff or 36 */
	outb_p(0xaa, 0x3fa);				/* Inverse of 55 */
	outb_p(0x36, 0x3fa);				/* Address the chip */
	outb_p(0xe4, 0x3fa);				/* 390/4; 390 = config address */
	outb_p(0x1b, 0x2fa);				/* Inverse of e4 */
	outb_p(0x0f, 0x390);				/* Write index */
	if (inb_p(0x391) != 0xe4)			/* Config address found? */
		return -1;				/* No: no 82C710 here */

	outb_p(0x0d, 0x390);				/* Write index */
	ct82c710_iores.start = inb_p(0x391) << 2;	/* Get mouse I/O address */
	ct82c710_iores.end = ct82c710_iores.start + 1;
	ct82c710_iores.flags = IORESOURCE_IO;
	outb_p(0x0f, 0x390);
	outb_p(0x0f, 0x391);				/* Close config mode */

	return 0;
}

static struct serio * __init ct82c710_allocate_port(void)
{
	struct serio *serio;

	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (serio) {
		memset(serio, 0, sizeof(struct serio));
		serio->id.type = SERIO_8042;
		serio->open = ct82c710_open;
		serio->close = ct82c710_close;
		serio->write = ct82c710_write;
		serio->dev.parent = &ct82c710_device->dev;
		strlcpy(serio->name, "C&T 82c710 mouse port", sizeof(serio->name));
		snprintf(serio->phys, sizeof(serio->phys), "isa%04lx/serio0", CT82C710_DATA);
	}

	return serio;
}

static int __init ct82c710_init(void)
{
	if (ct82c710_probe())
		return -ENODEV;

	ct82c710_device = platform_device_register_simple("ct82c710", -1, &ct82c710_iores, 1);
	if (IS_ERR(ct82c710_device))
		return PTR_ERR(ct82c710_device);

	if (!(ct82c710_port = ct82c710_allocate_port())) {
		platform_device_unregister(ct82c710_device);
		return -ENOMEM;
	}

	serio_register_port(ct82c710_port);

	printk(KERN_INFO "serio: C&T 82c710 mouse port at %#lx irq %d\n",
		CT82C710_DATA, CT82C710_IRQ);

	return 0;
}

static void __exit ct82c710_exit(void)
{
	serio_unregister_port(ct82c710_port);
	platform_device_unregister(ct82c710_device);
}

module_init(ct82c710_init);
module_exit(ct82c710_exit);
OpenPOWER on IntegriCloud