129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#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 <mach/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 (__raw_readb(PHDR) & PHDR_TS_PEN_DOWN) {
|
|
scpdr = __raw_readb(SCPDR);
|
|
scpdr |= SCPDR_TS_SCAN_ENABLE;
|
|
scpdr &= ~SCPDR_TS_SCAN_Y;
|
|
__raw_writeb(scpdr, SCPDR);
|
|
udelay(30);
|
|
|
|
absy = adc_single(ADC_CHANNEL_TS_Y);
|
|
|
|
scpdr = __raw_readb(SCPDR);
|
|
scpdr |= SCPDR_TS_SCAN_Y;
|
|
scpdr &= ~SCPDR_TS_SCAN_X;
|
|
__raw_writeb(scpdr, SCPDR);
|
|
udelay(30);
|
|
|
|
absx = adc_single(ADC_CHANNEL_TS_X);
|
|
|
|
scpdr = __raw_readb(SCPDR);
|
|
scpdr |= SCPDR_TS_SCAN_X;
|
|
scpdr &= ~SCPDR_TS_SCAN_ENABLE;
|
|
__raw_writeb(scpdr, SCPDR);
|
|
udelay(100);
|
|
touched = __raw_readb(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,
|
|
0, MODNAME, NULL) < 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_sync(&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_sync(&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");
|