// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* 82C710 C&T mouse port chip driver for Linux
*/
#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 <[email protected]>");
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(*ct82c710_port), 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;
strscpy(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 void ct82c710_remove(struct platform_device *dev)
{
serio_unregister_port(ct82c710_port);
}
static struct platform_driver ct82c710_driver = {
.driver = {
.name = "ct82c710",
},
.probe = ct82c710_probe,
.remove_new = 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);
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