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#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/adc.h>
#include <asm/hp6xx/hp6xx.h>
#define MODNAME "hp680_ts_input"
#define HP680_TS_ABS_X_MIN 40
#define HP680_TS_ABS_X_MAX 950
#define HP680_TS_ABS_Y_MIN 80
#define HP680_TS_ABS_Y_MAX 910
#define SCPCR 0xa4000116
#define PHDR 0xa400012e
#define SCPDR 0xa4000136
static void do_softint(void *data);
static struct input_dev *hp680_ts_dev;
static DECLARE_WORK(work, do_softint, 0);
static void do_softint(void *data)
{
int absx = 0, absy = 0;
u8 scpdr;
int touched = 0;
if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
scpdr = ctrl_inb(SCPDR);
scpdr |= SCPDR_TS_SCAN_ENABLE;
scpdr &= ~SCPDR_TS_SCAN_Y;
ctrl_outb(scpdr, SCPDR);
udelay(30);
absy = adc_single(ADC_CHANNEL_TS_Y);
scpdr = ctrl_inb(SCPDR);
scpdr |= SCPDR_TS_SCAN_Y;
scpdr &= ~SCPDR_TS_SCAN_X;
ctrl_outb(scpdr, SCPDR);
udelay(30);
absx = adc_single(ADC_CHANNEL_TS_X);
scpdr = ctrl_inb(SCPDR);
scpdr |= SCPDR_TS_SCAN_X;
scpdr &= ~SCPDR_TS_SCAN_ENABLE;
ctrl_outb(scpdr, SCPDR);
udelay(100);
touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
}
if (touched) {
input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
input_report_abs(hp680_ts_dev, ABS_X, absx);
input_report_abs(hp680_ts_dev, ABS_Y, absy);
} else {
input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
}
input_sync(hp680_ts_dev);
enable_irq(HP680_TS_IRQ);
}
static irqreturn_t hp680_ts_interrupt(int irq, void *dev, struct pt_regs *regs)
{
disable_irq_nosync(irq);
schedule_delayed_work(&work, HZ / 20);
return IRQ_HANDLED;
}
static int __init hp680_ts_init(void)
{
u8 scpdr;
u16 scpcr;
scpdr = ctrl_inb(SCPDR);
scpdr |= SCPDR_TS_SCAN_X | SCPDR_TS_SCAN_Y;
scpdr &= ~SCPDR_TS_SCAN_ENABLE;
ctrl_outb(scpdr, SCPDR);
scpcr = ctrl_inw(SCPCR);
scpcr &= ~SCPCR_TS_MASK;
scpcr |= SCPCR_TS_ENABLE;
ctrl_outw(scpcr, SCPCR);
hp680_ts_dev = input_allocate_device();
if (!hp680_ts_dev)
return -ENOMEM;
hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
hp680_ts_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
hp680_ts_dev->absmin[ABS_X] = HP680_TS_ABS_X_MIN;
hp680_ts_dev->absmin[ABS_Y] = HP680_TS_ABS_Y_MIN;
hp680_ts_dev->absmax[ABS_X] = HP680_TS_ABS_X_MAX;
hp680_ts_dev->absmax[ABS_Y] = HP680_TS_ABS_Y_MAX;
hp680_ts_dev->name = "HP Jornada touchscreen";
hp680_ts_dev->phys = "hp680_ts/input0";
input_register_device(hp680_ts_dev);
if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
SA_INTERRUPT, MODNAME, 0) < 0) {
printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
HP680_TS_IRQ);
input_unregister_device(hp680_ts_dev);
return -EBUSY;
}
return 0;
}
static void __exit hp680_ts_exit(void)
{
free_irq(HP680_TS_IRQ, 0);
cancel_delayed_work(&work);
flush_scheduled_work();
input_unregister_device(hp680_ts_dev);
}
module_init(hp680_ts_init);
module_exit(hp680_ts_exit);
MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
MODULE_LICENSE("GPL");
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