tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * $Id: ct82c710.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
3 *
4 * Copyright (c) 1999-2001 Vojtech Pavlik
5 */
6
7/*
8 * 82C710 C&T mouse port chip driver for Linux
9 */
10
11/*
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 * Should you need to contact me, the author, you can do so either by
27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
29 */
30
31#include <linux/delay.h>
32#include <linux/module.h>
33#include <linux/ioport.h>
34#include <linux/config.h>
35#include <linux/init.h>
36#include <linux/interrupt.h>
37#include <linux/serio.h>
38#include <linux/errno.h>
39#include <linux/err.h>
40#include <linux/platform_device.h>
41
42#include <asm/io.h>
43
44MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
45MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
46MODULE_LICENSE("GPL");
47
48/*
49 * ct82c710 interface
50 */
51
52#define CT82C710_DEV_IDLE 0x01 /* Device Idle */
53#define CT82C710_RX_FULL 0x02 /* Device Char received */
54#define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */
55#define CT82C710_RESET 0x08 /* Device Reset */
56#define CT82C710_INTS_ON 0x10 /* Device Interrupt On */
57#define CT82C710_ERROR_FLAG 0x20 /* Device Error */
58#define CT82C710_CLEAR 0x40 /* Device Clear */
59#define CT82C710_ENABLE 0x80 /* Device Enable */
60
61#define CT82C710_IRQ 12
62
63#define CT82C710_DATA ct82c710_iores.start
64#define CT82C710_STATUS (ct82c710_iores.start + 1)
65
66static struct serio *ct82c710_port;
67static struct platform_device *ct82c710_device;
68static struct resource ct82c710_iores;
69
70/*
71 * Interrupt handler for the 82C710 mouse port. A character
72 * is waiting in the 82C710.
73 */
74
75static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id, struct pt_regs * regs)
76{
77 return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0, regs);
78}
79
80/*
81 * Wait for device to send output char and flush any input char.
82 */
83
84static int ct82c170_wait(void)
85{
86 int timeout = 60000;
87
88 while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE))
89 != (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) {
90
91 if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA);
92
93 udelay(1);
94 timeout--;
95 }
96
97 return !timeout;
98}
99
100static void ct82c710_close(struct serio *serio)
101{
102 if (ct82c170_wait())
103 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
104
105 outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS);
106
107 if (ct82c170_wait())
108 printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
109
110 free_irq(CT82C710_IRQ, NULL);
111}
112
113static int ct82c710_open(struct serio *serio)
114{
115 unsigned char status;
116
117 if (request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL))
118 return -1;
119
120 status = inb_p(CT82C710_STATUS);
121
122 status |= (CT82C710_ENABLE | CT82C710_RESET);
123 outb_p(status, CT82C710_STATUS);
124
125 status &= ~(CT82C710_RESET);
126 outb_p(status, CT82C710_STATUS);
127
128 status |= CT82C710_INTS_ON;
129 outb_p(status, CT82C710_STATUS); /* Enable interrupts */
130
131 while (ct82c170_wait()) {
132 printk(KERN_ERR "ct82c710: Device busy in open()\n");
133 status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON);
134 outb_p(status, CT82C710_STATUS);
135 free_irq(CT82C710_IRQ, NULL);
136 return -1;
137 }
138
139 return 0;
140}
141
142/*
143 * Write to the 82C710 mouse device.
144 */
145
146static int ct82c710_write(struct serio *port, unsigned char c)
147{
148 if (ct82c170_wait()) return -1;
149 outb_p(c, CT82C710_DATA);
150 return 0;
151}
152
153/*
154 * See if we can find a 82C710 device. Read mouse address.
155 */
156
157static int __init ct82c710_probe(void)
158{
159 outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */
160 outb_p(0xaa, 0x3fa); /* Inverse of 55 */
161 outb_p(0x36, 0x3fa); /* Address the chip */
162 outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */
163 outb_p(0x1b, 0x2fa); /* Inverse of e4 */
164 outb_p(0x0f, 0x390); /* Write index */
165 if (inb_p(0x391) != 0xe4) /* Config address found? */
166 return -1; /* No: no 82C710 here */
167
168 outb_p(0x0d, 0x390); /* Write index */
169 ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */
170 ct82c710_iores.end = ct82c710_iores.start + 1;
171 ct82c710_iores.flags = IORESOURCE_IO;
172 outb_p(0x0f, 0x390);
173 outb_p(0x0f, 0x391); /* Close config mode */
174
175 return 0;
176}
177
178static struct serio * __init ct82c710_allocate_port(void)
179{
180 struct serio *serio;
181
182 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
183 if (serio) {
184 memset(serio, 0, sizeof(struct serio));
185 serio->id.type = SERIO_8042;
186 serio->open = ct82c710_open;
187 serio->close = ct82c710_close;
188 serio->write = ct82c710_write;
189 serio->dev.parent = &ct82c710_device->dev;
190 strlcpy(serio->name, "C&T 82c710 mouse port", sizeof(serio->name));
191 snprintf(serio->phys, sizeof(serio->phys), "isa%04lx/serio0", CT82C710_DATA);
192 }
193
194 return serio;
195}
196
197static int __init ct82c710_init(void)
198{
199 if (ct82c710_probe())
200 return -ENODEV;
201
202 ct82c710_device = platform_device_register_simple("ct82c710", -1, &ct82c710_iores, 1);
203 if (IS_ERR(ct82c710_device))
204 return PTR_ERR(ct82c710_device);
205
206 if (!(ct82c710_port = ct82c710_allocate_port())) {
207 platform_device_unregister(ct82c710_device);
208 return -ENOMEM;
209 }
210
211 serio_register_port(ct82c710_port);
212
213 printk(KERN_INFO "serio: C&T 82c710 mouse port at %#lx irq %d\n",
214 CT82C710_DATA, CT82C710_IRQ);
215
216 return 0;
217}
218
219static void __exit ct82c710_exit(void)
220{
221 serio_unregister_port(ct82c710_port);
222 platform_device_unregister(ct82c710_device);
223}
224
225module_init(ct82c710_init);
226module_exit(ct82c710_exit);