diff options
Diffstat (limited to 'drivers/input/touchscreen/mk712.c')
| -rw-r--r-- | drivers/input/touchscreen/mk712.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/mk712.c b/drivers/input/touchscreen/mk712.c new file mode 100644 index 000000000..753d9cc1d --- /dev/null +++ b/drivers/input/touchscreen/mk712.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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 driver supports the ICS MicroClock MK712 TouchScreen controller, + * found in Gateway AOL Connected Touchpad computers. + * + * Documentation for ICS MK712 can be found at: + * https://www.idt.com/general-parts/mk712-touch-screen-controller + */ + +/* + * 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_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); |