257 lines
6.4 KiB
C
257 lines
6.4 KiB
C
/*
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* Copyright (c) 1999-2001 Vojtech Pavlik
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*/
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/*
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* 82C710 C&T mouse port chip driver for Linux
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/serio.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("82C710 C&T mouse port chip driver");
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MODULE_LICENSE("GPL");
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/*
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* ct82c710 interface
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*/
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#define CT82C710_DEV_IDLE 0x01 /* Device Idle */
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#define CT82C710_RX_FULL 0x02 /* Device Char received */
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#define CT82C710_TX_IDLE 0x04 /* Device XMIT Idle */
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#define CT82C710_RESET 0x08 /* Device Reset */
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#define CT82C710_INTS_ON 0x10 /* Device Interrupt On */
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#define CT82C710_ERROR_FLAG 0x20 /* Device Error */
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#define CT82C710_CLEAR 0x40 /* Device Clear */
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#define CT82C710_ENABLE 0x80 /* Device Enable */
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#define CT82C710_IRQ 12
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#define CT82C710_DATA ct82c710_iores.start
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#define CT82C710_STATUS (ct82c710_iores.start + 1)
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static struct serio *ct82c710_port;
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static struct platform_device *ct82c710_device;
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static struct resource ct82c710_iores;
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/*
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* Interrupt handler for the 82C710 mouse port. A character
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* is waiting in the 82C710.
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*/
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static irqreturn_t ct82c710_interrupt(int cpl, void *dev_id)
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{
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return serio_interrupt(ct82c710_port, inb(CT82C710_DATA), 0);
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}
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/*
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* Wait for device to send output char and flush any input char.
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*/
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static int ct82c170_wait(void)
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{
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int timeout = 60000;
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while ((inb(CT82C710_STATUS) & (CT82C710_RX_FULL | CT82C710_TX_IDLE | CT82C710_DEV_IDLE))
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!= (CT82C710_DEV_IDLE | CT82C710_TX_IDLE) && timeout) {
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if (inb_p(CT82C710_STATUS) & CT82C710_RX_FULL) inb_p(CT82C710_DATA);
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udelay(1);
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timeout--;
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}
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return !timeout;
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}
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static void ct82c710_close(struct serio *serio)
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{
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if (ct82c170_wait())
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printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
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outb_p(inb_p(CT82C710_STATUS) & ~(CT82C710_ENABLE | CT82C710_INTS_ON), CT82C710_STATUS);
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if (ct82c170_wait())
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printk(KERN_WARNING "ct82c710.c: Device busy in close()\n");
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free_irq(CT82C710_IRQ, NULL);
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}
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static int ct82c710_open(struct serio *serio)
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{
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unsigned char status;
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int err;
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err = request_irq(CT82C710_IRQ, ct82c710_interrupt, 0, "ct82c710", NULL);
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if (err)
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return err;
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status = inb_p(CT82C710_STATUS);
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status |= (CT82C710_ENABLE | CT82C710_RESET);
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outb_p(status, CT82C710_STATUS);
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status &= ~(CT82C710_RESET);
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outb_p(status, CT82C710_STATUS);
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status |= CT82C710_INTS_ON;
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outb_p(status, CT82C710_STATUS); /* Enable interrupts */
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while (ct82c170_wait()) {
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printk(KERN_ERR "ct82c710: Device busy in open()\n");
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status &= ~(CT82C710_ENABLE | CT82C710_INTS_ON);
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outb_p(status, CT82C710_STATUS);
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free_irq(CT82C710_IRQ, NULL);
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return -EBUSY;
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}
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return 0;
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}
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/*
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* Write to the 82C710 mouse device.
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*/
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static int ct82c710_write(struct serio *port, unsigned char c)
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{
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if (ct82c170_wait()) return -1;
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outb_p(c, CT82C710_DATA);
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return 0;
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}
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/*
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* See if we can find a 82C710 device. Read mouse address.
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*/
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static int __init ct82c710_detect(void)
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{
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outb_p(0x55, 0x2fa); /* Any value except 9, ff or 36 */
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outb_p(0xaa, 0x3fa); /* Inverse of 55 */
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outb_p(0x36, 0x3fa); /* Address the chip */
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outb_p(0xe4, 0x3fa); /* 390/4; 390 = config address */
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outb_p(0x1b, 0x2fa); /* Inverse of e4 */
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outb_p(0x0f, 0x390); /* Write index */
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if (inb_p(0x391) != 0xe4) /* Config address found? */
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return -ENODEV; /* No: no 82C710 here */
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outb_p(0x0d, 0x390); /* Write index */
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ct82c710_iores.start = inb_p(0x391) << 2; /* Get mouse I/O address */
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ct82c710_iores.end = ct82c710_iores.start + 1;
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ct82c710_iores.flags = IORESOURCE_IO;
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outb_p(0x0f, 0x390);
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outb_p(0x0f, 0x391); /* Close config mode */
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return 0;
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}
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static int ct82c710_probe(struct platform_device *dev)
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{
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ct82c710_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!ct82c710_port)
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return -ENOMEM;
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ct82c710_port->id.type = SERIO_8042;
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ct82c710_port->dev.parent = &dev->dev;
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ct82c710_port->open = ct82c710_open;
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ct82c710_port->close = ct82c710_close;
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ct82c710_port->write = ct82c710_write;
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strlcpy(ct82c710_port->name, "C&T 82c710 mouse port",
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sizeof(ct82c710_port->name));
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snprintf(ct82c710_port->phys, sizeof(ct82c710_port->phys),
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"isa%16llx/serio0", (unsigned long long)CT82C710_DATA);
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serio_register_port(ct82c710_port);
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printk(KERN_INFO "serio: C&T 82c710 mouse port at %#llx irq %d\n",
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(unsigned long long)CT82C710_DATA, CT82C710_IRQ);
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return 0;
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}
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static int ct82c710_remove(struct platform_device *dev)
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{
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serio_unregister_port(ct82c710_port);
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return 0;
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}
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static struct platform_driver ct82c710_driver = {
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.driver = {
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.name = "ct82c710",
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},
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.probe = ct82c710_probe,
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.remove = ct82c710_remove,
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};
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static int __init ct82c710_init(void)
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{
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int error;
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error = ct82c710_detect();
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if (error)
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return error;
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error = platform_driver_register(&ct82c710_driver);
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if (error)
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return error;
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ct82c710_device = platform_device_alloc("ct82c710", -1);
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if (!ct82c710_device) {
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error = -ENOMEM;
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goto err_unregister_driver;
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}
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error = platform_device_add_resources(ct82c710_device, &ct82c710_iores, 1);
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if (error)
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goto err_free_device;
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error = platform_device_add(ct82c710_device);
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if (error)
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goto err_free_device;
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return 0;
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err_free_device:
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platform_device_put(ct82c710_device);
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err_unregister_driver:
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platform_driver_unregister(&ct82c710_driver);
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return error;
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}
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static void __exit ct82c710_exit(void)
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{
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platform_device_unregister(ct82c710_device);
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platform_driver_unregister(&ct82c710_driver);
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}
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module_init(ct82c710_init);
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module_exit(ct82c710_exit);
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