220 lines
5.7 KiB
C
220 lines
5.7 KiB
C
/*
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* ICS MK712 touchscreen controller driver
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*
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* Copyright (c) 1999-2002 Transmeta Corporation
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* Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>
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* Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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/*
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* This driver supports the ICS MicroClock MK712 TouchScreen controller,
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* found in Gateway AOL Connected Touchpad computers.
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*
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* Documentation for ICS MK712 can be found at:
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* https://www.idt.com/general-parts/mk712-touch-screen-controller
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*/
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/*
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* 1999-12-18: original version, Daniel Quinlan
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* 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
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* to use queue_empty, Nathan Laredo
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* 1999-12-20: improved random point rejection, Nathan Laredo
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* 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed
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* queue code, added module options, other fixes, Daniel Quinlan
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* 2002-03-15: Clean up for kernel merge <alan@redhat.com>
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* Fixed multi open race, fixed memory checks, fixed resource
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* allocation, fixed close/powerdown bug, switched to new init
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* 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch
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* 2005-02-05: Rewritten for the input layer, Vojtech Pavlik
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <asm/io.h>
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MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
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MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
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MODULE_LICENSE("GPL");
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static unsigned int mk712_io = 0x260; /* Also 0x200, 0x208, 0x300 */
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module_param_hw_named(io, mk712_io, uint, ioport, 0);
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MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
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static unsigned int mk712_irq = 10; /* Also 12, 14, 15 */
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module_param_hw_named(irq, mk712_irq, uint, irq, 0);
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MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
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/* eight 8-bit registers */
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#define MK712_STATUS 0
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#define MK712_X 2
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#define MK712_Y 4
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#define MK712_CONTROL 6
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#define MK712_RATE 7
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/* status */
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#define MK712_STATUS_TOUCH 0x10
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#define MK712_CONVERSION_COMPLETE 0x80
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/* control */
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#define MK712_ENABLE_INT 0x01
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#define MK712_INT_ON_CONVERSION_COMPLETE 0x02
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#define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS 0x04
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#define MK712_ENABLE_PERIODIC_CONVERSIONS 0x10
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#define MK712_READ_ONE_POINT 0x20
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#define MK712_POWERUP 0x40
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static struct input_dev *mk712_dev;
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static DEFINE_SPINLOCK(mk712_lock);
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static irqreturn_t mk712_interrupt(int irq, void *dev_id)
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{
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unsigned char status;
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static int debounce = 1;
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static unsigned short last_x;
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static unsigned short last_y;
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spin_lock(&mk712_lock);
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status = inb(mk712_io + MK712_STATUS);
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if (~status & MK712_CONVERSION_COMPLETE) {
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debounce = 1;
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goto end;
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}
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if (~status & MK712_STATUS_TOUCH) {
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debounce = 1;
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input_report_key(mk712_dev, BTN_TOUCH, 0);
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goto end;
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}
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if (debounce) {
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debounce = 0;
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goto end;
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}
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input_report_key(mk712_dev, BTN_TOUCH, 1);
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input_report_abs(mk712_dev, ABS_X, last_x);
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input_report_abs(mk712_dev, ABS_Y, last_y);
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end:
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last_x = inw(mk712_io + MK712_X) & 0x0fff;
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last_y = inw(mk712_io + MK712_Y) & 0x0fff;
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input_sync(mk712_dev);
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spin_unlock(&mk712_lock);
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return IRQ_HANDLED;
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}
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static int mk712_open(struct input_dev *dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&mk712_lock, flags);
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outb(0, mk712_io + MK712_CONTROL); /* Reset */
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outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |
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MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |
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MK712_ENABLE_PERIODIC_CONVERSIONS |
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MK712_POWERUP, mk712_io + MK712_CONTROL);
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outb(10, mk712_io + MK712_RATE); /* 187 points per second */
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spin_unlock_irqrestore(&mk712_lock, flags);
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return 0;
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}
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static void mk712_close(struct input_dev *dev)
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{
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unsigned long flags;
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spin_lock_irqsave(&mk712_lock, flags);
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outb(0, mk712_io + MK712_CONTROL);
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spin_unlock_irqrestore(&mk712_lock, flags);
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}
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static int __init mk712_init(void)
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{
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int err;
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if (!request_region(mk712_io, 8, "mk712")) {
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printk(KERN_WARNING "mk712: unable to get IO region\n");
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return -ENODEV;
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}
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outb(0, mk712_io + MK712_CONTROL);
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if ((inw(mk712_io + MK712_X) & 0xf000) || /* Sanity check */
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(inw(mk712_io + MK712_Y) & 0xf000) ||
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(inw(mk712_io + MK712_STATUS) & 0xf333)) {
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printk(KERN_WARNING "mk712: device not present\n");
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err = -ENODEV;
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goto fail1;
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}
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mk712_dev = input_allocate_device();
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if (!mk712_dev) {
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printk(KERN_ERR "mk712: not enough memory\n");
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err = -ENOMEM;
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goto fail1;
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}
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mk712_dev->name = "ICS MicroClock MK712 TouchScreen";
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mk712_dev->phys = "isa0260/input0";
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mk712_dev->id.bustype = BUS_ISA;
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mk712_dev->id.vendor = 0x0005;
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mk712_dev->id.product = 0x0001;
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mk712_dev->id.version = 0x0100;
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mk712_dev->open = mk712_open;
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mk712_dev->close = mk712_close;
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mk712_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
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input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
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if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {
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printk(KERN_WARNING "mk712: unable to get IRQ\n");
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err = -EBUSY;
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goto fail1;
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}
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err = input_register_device(mk712_dev);
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if (err)
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goto fail2;
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return 0;
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fail2: free_irq(mk712_irq, mk712_dev);
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fail1: input_free_device(mk712_dev);
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release_region(mk712_io, 8);
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return err;
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}
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static void __exit mk712_exit(void)
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{
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input_unregister_device(mk712_dev);
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free_irq(mk712_irq, mk712_dev);
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release_region(mk712_io, 8);
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}
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module_init(mk712_init);
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module_exit(mk712_exit);
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