2 * $Id: ct82c710.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
4 * Copyright (c) 1999-2001 Vojtech Pavlik
8 * 82C710 C&T mouse port chip driver for Linux
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.
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.
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
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
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>
44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
45 MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
46 MODULE_LICENSE("GPL");
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 */
61 #define CT82C710_IRQ 12
63 #define CT82C710_DATA ct82c710_iores.start
64 #define CT82C710_STATUS (ct82c710_iores.start + 1)
66 static struct serio
*ct82c710_port
;
67 static struct platform_device
*ct82c710_device
;
68 static struct resource ct82c710_iores
;
71 * Interrupt handler for the 82C710 mouse port. A character
72 * is waiting in the 82C710.
75 static irqreturn_t
ct82c710_interrupt(int cpl
, void *dev_id
, struct pt_regs
* regs
)
77 return serio_interrupt(ct82c710_port
, inb(CT82C710_DATA
), 0, regs
);
81 * Wait for device to send output char and flush any input char.
84 static int ct82c170_wait(void)
88 while ((inb(CT82C710_STATUS
) & (CT82C710_RX_FULL
| CT82C710_TX_IDLE
| CT82C710_DEV_IDLE
))
89 != (CT82C710_DEV_IDLE
| CT82C710_TX_IDLE
) && timeout
) {
91 if (inb_p(CT82C710_STATUS
) & CT82C710_RX_FULL
) inb_p(CT82C710_DATA
);
100 static void ct82c710_close(struct serio
*serio
)
103 printk(KERN_WARNING
"ct82c710.c: Device busy in close()\n");
105 outb_p(inb_p(CT82C710_STATUS
) & ~(CT82C710_ENABLE
| CT82C710_INTS_ON
), CT82C710_STATUS
);
108 printk(KERN_WARNING
"ct82c710.c: Device busy in close()\n");
110 free_irq(CT82C710_IRQ
, NULL
);
113 static int ct82c710_open(struct serio
*serio
)
115 unsigned char status
;
117 if (request_irq(CT82C710_IRQ
, ct82c710_interrupt
, 0, "ct82c710", NULL
))
120 status
= inb_p(CT82C710_STATUS
);
122 status
|= (CT82C710_ENABLE
| CT82C710_RESET
);
123 outb_p(status
, CT82C710_STATUS
);
125 status
&= ~(CT82C710_RESET
);
126 outb_p(status
, CT82C710_STATUS
);
128 status
|= CT82C710_INTS_ON
;
129 outb_p(status
, CT82C710_STATUS
); /* Enable interrupts */
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
);
143 * Write to the 82C710 mouse device.
146 static int ct82c710_write(struct serio
*port
, unsigned char c
)
148 if (ct82c170_wait()) return -1;
149 outb_p(c
, CT82C710_DATA
);
154 * See if we can find a 82C710 device. Read mouse address.
157 static int __init
ct82c710_probe(void)
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 */
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
;
173 outb_p(0x0f, 0x391); /* Close config mode */
178 static struct serio
* __init
ct82c710_allocate_port(void)
182 serio
= kmalloc(sizeof(struct serio
), GFP_KERNEL
);
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
);
197 static int __init
ct82c710_init(void)
199 if (ct82c710_probe())
202 ct82c710_device
= platform_device_register_simple("ct82c710", -1, &ct82c710_iores
, 1);
203 if (IS_ERR(ct82c710_device
))
204 return PTR_ERR(ct82c710_device
);
206 if (!(ct82c710_port
= ct82c710_allocate_port())) {
207 platform_device_unregister(ct82c710_device
);
211 serio_register_port(ct82c710_port
);
213 printk(KERN_INFO
"serio: C&T 82c710 mouse port at %#lx irq %d\n",
214 CT82C710_DATA
, CT82C710_IRQ
);
219 static void __exit
ct82c710_exit(void)
221 serio_unregister_port(ct82c710_port
);
222 platform_device_unregister(ct82c710_device
);
225 module_init(ct82c710_init
);
226 module_exit(ct82c710_exit
);