--- /dev/null
+/*
+ * 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;
+}
+
+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;
+}
+
+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);
+}
+
+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;
+}
+
+static void __exit mk712_exit(void)
+{
+ input_unregister_device(mk712_dev);
+ free_irq(mk712_irq, mk712_dev);
+ release_region(mk712_io, 8);
+}
+
+module_init(mk712_init);
+module_exit(mk712_exit);
Code Review / kvmfornfv.git / blobdiff