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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
245 lines
5.7 KiB
C
245 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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*/
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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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