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hp680_ts_input.c

#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.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     PHDR  0xa400012e
#define SCPDR     0xa4000136

static void do_softint(struct work_struct *work);

static struct input_dev *hp680_ts_dev;
static DECLARE_DELAYED_WORK(work, do_softint);

static void do_softint(struct work_struct *work)
{
      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)
{
      disable_irq_nosync(irq);
      schedule_delayed_work(&work, HZ / 20);

      return IRQ_HANDLED;
}

static int __init hp680_ts_init(void)
{
      int err;

      hp680_ts_dev = input_allocate_device();
      if (!hp680_ts_dev)
            return -ENOMEM;

      hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
      hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

      input_set_abs_params(hp680_ts_dev, ABS_X,
            HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);
      input_set_abs_params(hp680_ts_dev, ABS_Y,
            HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0);

      hp680_ts_dev->name = "HP Jornada touchscreen";
      hp680_ts_dev->phys = "hp680_ts/input0";

      if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
                  IRQF_DISABLED, MODNAME, 0) < 0) {
            printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
                   HP680_TS_IRQ);
            err = -EBUSY;
            goto fail1;
      }

      err = input_register_device(hp680_ts_dev);
      if (err)
            goto fail2;

      return 0;

 fail2:     free_irq(HP680_TS_IRQ, NULL);
      cancel_delayed_work(&work);
      flush_scheduled_work();
 fail1:     input_free_device(hp680_ts_dev);
      return err;
}

static void __exit hp680_ts_exit(void)
{
      free_irq(HP680_TS_IRQ, NULL);
      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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