/* * ICS MK712 touchscreen controller driver * * Copyright (c) 1999-2002 Transmeta Corporation * Copyright (c) 2005 Rick Koch * Copyright (c) 2005 Vojtech Pavlik */ /* * 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 * 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 #include #include #include #include #include #include #include #include MODULE_AUTHOR("Daniel Quinlan , Vojtech Pavlik "); MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver"); MODULE_LICENSE("GPL"); static unsigned int mk712_io = 0x260; /* Also 0x200, 0x208, 0x300 */ module_param_hw_named(io, mk712_io, uint, ioport, 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_hw_named(irq, mk712_irq, uint, irq, 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);