257 lines
6.4 KiB
C
Executable file
257 lines
6.4 KiB
C
Executable file
/*
|
|
* 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
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.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 <linux/slab.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)
|
|
{
|
|
return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int err;
|
|
|
|
err = request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
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 -EBUSY;
|
|
}
|
|
|
|
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_detect(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 -ENODEV; /* 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 int ct82c710_probe(struct platform_device *dev)
|
|
{
|
|
ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
|
|
if (!ct82c710_port)
|
|
return -ENOMEM;
|
|
|
|
ct82c710_port->id.type = SERIO_8042;
|
|
ct82c710_port->dev.parent = &dev->dev;
|
|
ct82c710_port->open = ct82c710_open;
|
|
ct82c710_port->close = ct82c710_close;
|
|
ct82c710_port->write = ct82c710_write;
|
|
strlcpy(ct82c710_port->name, "C&T 82c710 mouse port",
|
|
sizeof(ct82c710_port->name));
|
|
snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys),
|
|
"isa%16llx/serio0", (unsigned long long)CT82C710_DATA);
|
|
|
|
serio_register_port(ct82c710_port);
|
|
|
|
printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n",
|
|
(unsigned long long)CT82C710_DATA, CT82C710_IRQ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ct82c710_remove(struct platform_device *dev)
|
|
{
|
|
serio_unregister_port(ct82c710_port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ct82c710_driver = {
|
|
.driver = {
|
|
.name = "ct82c710",
|
|
},
|
|
.probe = ct82c710_probe,
|
|
.remove = ct82c710_remove,
|
|
};
|
|
|
|
|
|
static int __init ct82c710_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = ct82c710_detect();
|
|
if (error)
|
|
return error;
|
|
|
|
error = platform_driver_register(&ct82c710_driver);
|
|
if (error)
|
|
return error;
|
|
|
|
ct82c710_device = platform_device_alloc("ct82c710", -1);
|
|
if (!ct82c710_device) {
|
|
error = -ENOMEM;
|
|
goto err_unregister_driver;
|
|
}
|
|
|
|
error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1);
|
|
if (error)
|
|
goto err_free_device;
|
|
|
|
error = platform_device_add(ct82c710_device);
|
|
if (error)
|
|
goto err_free_device;
|
|
|
|
return 0;
|
|
|
|
err_free_device:
|
|
platform_device_put(ct82c710_device);
|
|
err_unregister_driver:
|
|
platform_driver_unregister(&ct82c710_driver);
|
|
return error;
|
|
}
|
|
|
|
static void __exit ct82c710_exit(void)
|
|
{
|
|
platform_device_unregister(ct82c710_device);
|
|
platform_driver_unregister(&ct82c710_driver);
|
|
}
|
|
|
|
module_init(ct82c710_init);
|
|
module_exit(ct82c710_exit);
|