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Release 4.11 drivers/input/touchscreen/mk712.c

/*
 * ICS MK712 touchscreen controller driver
 *
 * Copyright (c) 1999-2002 Transmeta Corporation
 * Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>
 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

/*
 * This driver supports the ICS MicroClock MK712 TouchScreen controller,
 * found in Gateway AOL Connected Touchpad computers.
 *
 * Documentation for ICS MK712 can be found at:
 *      http://www.idt.com/products/getDoc.cfm?docID=18713923
 */

/*
 * 1999-12-18: original version, Daniel Quinlan
 * 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
 *             to use queue_empty, Nathan Laredo
 * 1999-12-20: improved random point rejection, Nathan Laredo
 * 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed
 *             queue code, added module options, other fixes, Daniel Quinlan
 * 2002-03-15: Clean up for kernel merge <alan@redhat.com>
 *             Fixed multi open race, fixed memory checks, fixed resource
 *             allocation, fixed close/powerdown bug, switched to new init
 * 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch
 * 2005-02-05: Rewritten for the input layer, Vojtech Pavlik
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <asm/io.h>

MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
MODULE_LICENSE("GPL");


static unsigned int mk712_io = 0x260;	
/* Also 0x200, 0x208, 0x300 */
module_param_named(io, mk712_io, uint, 0);
MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");


static unsigned int mk712_irq = 10;	
/* Also 12, 14, 15 */
module_param_named(irq, mk712_irq, uint, 0);
MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");

/* eight 8-bit registers */

#define MK712_STATUS		0

#define MK712_X			2

#define MK712_Y			4

#define MK712_CONTROL		6

#define MK712_RATE		7

/* status */

#define	MK712_STATUS_TOUCH			0x10

#define	MK712_CONVERSION_COMPLETE		0x80

/* control */

#define MK712_ENABLE_INT			0x01

#define MK712_INT_ON_CONVERSION_COMPLETE	0x02

#define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS	0x04

#define MK712_ENABLE_PERIODIC_CONVERSIONS	0x10

#define MK712_READ_ONE_POINT			0x20

#define MK712_POWERUP				0x40


static struct input_dev *mk712_dev;
static DEFINE_SPINLOCK(mk712_lock);


static irqreturn_t mk712_interrupt(int irq, void *dev_id) { unsigned char status; static int debounce = 1; static unsigned short last_x; static unsigned short last_y; spin_lock(&mk712_lock); status = inb(mk712_io + MK712_STATUS); if (~status & MK712_CONVERSION_COMPLETE) { debounce = 1; goto end; } if (~status & MK712_STATUS_TOUCH) { debounce = 1; input_report_key(mk712_dev, BTN_TOUCH, 0); goto end; } if (debounce) { debounce = 0; goto end; } input_report_key(mk712_dev, BTN_TOUCH, 1); input_report_abs(mk712_dev, ABS_X, last_x); input_report_abs(mk712_dev, ABS_Y, last_y); end: last_x = inw(mk712_io + MK712_X) & 0x0fff; last_y = inw(mk712_io + MK712_Y) & 0x0fff; input_sync(mk712_dev); spin_unlock(&mk712_lock); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik167100.00%1100.00%
Total167100.00%1100.00%


static int mk712_open(struct input_dev *dev) { unsigned long flags; spin_lock_irqsave(&mk712_lock, flags); outb(0, mk712_io + MK712_CONTROL); /* Reset */ outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE | MK712_INT_ON_CHANGE_IN_TOUCH_STATUS | MK712_ENABLE_PERIODIC_CONVERSIONS | MK712_POWERUP, mk712_io + MK712_CONTROL); outb(10, mk712_io + MK712_RATE); /* 187 points per second */ spin_unlock_irqrestore(&mk712_lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik71100.00%1100.00%
Total71100.00%1100.00%


static void mk712_close(struct input_dev *dev) { unsigned long flags; spin_lock_irqsave(&mk712_lock, flags); outb(0, mk712_io + MK712_CONTROL); spin_unlock_irqrestore(&mk712_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik40100.00%1100.00%
Total40100.00%1100.00%


static int __init mk712_init(void) { int err; if (!request_region(mk712_io, 8, "mk712")) { printk(KERN_WARNING "mk712: unable to get IO region\n"); return -ENODEV; } outb(0, mk712_io + MK712_CONTROL); if ((inw(mk712_io + MK712_X) & 0xf000) || /* Sanity check */ (inw(mk712_io + MK712_Y) & 0xf000) || (inw(mk712_io + MK712_STATUS) & 0xf333)) { printk(KERN_WARNING "mk712: device not present\n"); err = -ENODEV; goto fail1; } mk712_dev = input_allocate_device(); if (!mk712_dev) { printk(KERN_ERR "mk712: not enough memory\n"); err = -ENOMEM; goto fail1; } mk712_dev->name = "ICS MicroClock MK712 TouchScreen"; mk712_dev->phys = "isa0260/input0"; mk712_dev->id.bustype = BUS_ISA; mk712_dev->id.vendor = 0x0005; mk712_dev->id.product = 0x0001; mk712_dev->id.version = 0x0100; mk712_dev->open = mk712_open; mk712_dev->close = mk712_close; mk712_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0); input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0); if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) { printk(KERN_WARNING "mk712: unable to get IRQ\n"); err = -EBUSY; goto fail1; } err = input_register_device(mk712_dev); if (err) goto fail2; return 0; fail2: free_irq(mk712_irq, mk712_dev); fail1: input_free_device(mk712_dev); release_region(mk712_io, 8); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov18358.10%240.00%
Vojtech Pavlik12740.32%120.00%
Jiri Slaby41.27%120.00%
Adrian Bunk10.32%120.00%
Total315100.00%5100.00%


static void __exit mk712_exit(void) { input_unregister_device(mk712_dev); free_irq(mk712_irq, mk712_dev); release_region(mk712_io, 8); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik28100.00%1100.00%
Total28100.00%1100.00%

module_init(mk712_init); module_exit(mk712_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik60676.13%116.67%
Dmitry Torokhov18423.12%233.33%
Jiri Slaby40.50%116.67%
Adrian Bunk10.13%116.67%
Justin P. Mattock10.13%116.67%
Total796100.00%6100.00%
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