// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/delay.h>
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#include <asm/adc.h>
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#include <mach/hp6xx.h>
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#define MODNAME "hp680_ts_input"
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#define HP680_TS_ABS_X_MIN 40
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#define HP680_TS_ABS_X_MAX 950
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#define HP680_TS_ABS_Y_MIN 80
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#define HP680_TS_ABS_Y_MAX 910
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#define PHDR 0xa400012e
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#define SCPDR 0xa4000136
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static void do_softint(struct work_struct *work);
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static struct input_dev *hp680_ts_dev;
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static DECLARE_DELAYED_WORK(work, do_softint);
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static void do_softint(struct work_struct *work)
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{
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int absx = 0, absy = 0;
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u8 scpdr;
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int touched = 0;
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if (__raw_readb(PHDR) & PHDR_TS_PEN_DOWN) {
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scpdr = __raw_readb(SCPDR);
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scpdr |= SCPDR_TS_SCAN_ENABLE;
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scpdr &= ~SCPDR_TS_SCAN_Y;
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__raw_writeb(scpdr, SCPDR);
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udelay(30);
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absy = adc_single(ADC_CHANNEL_TS_Y);
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scpdr = __raw_readb(SCPDR);
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scpdr |= SCPDR_TS_SCAN_Y;
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scpdr &= ~SCPDR_TS_SCAN_X;
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__raw_writeb(scpdr, SCPDR);
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udelay(30);
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absx = adc_single(ADC_CHANNEL_TS_X);
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scpdr = __raw_readb(SCPDR);
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scpdr |= SCPDR_TS_SCAN_X;
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scpdr &= ~SCPDR_TS_SCAN_ENABLE;
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__raw_writeb(scpdr, SCPDR);
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udelay(100);
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touched = __raw_readb(PHDR) & PHDR_TS_PEN_DOWN;
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}
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if (touched) {
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input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
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input_report_abs(hp680_ts_dev, ABS_X, absx);
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input_report_abs(hp680_ts_dev, ABS_Y, absy);
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} else {
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input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
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}
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input_sync(hp680_ts_dev);
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enable_irq(HP680_TS_IRQ);
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}
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static irqreturn_t hp680_ts_interrupt(int irq, void *dev)
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{
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disable_irq_nosync(irq);
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schedule_delayed_work(&work, HZ / 20);
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return IRQ_HANDLED;
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}
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static int __init hp680_ts_init(void)
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{
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int err;
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hp680_ts_dev = input_allocate_device();
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if (!hp680_ts_dev)
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return -ENOMEM;
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hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
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hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(hp680_ts_dev, ABS_X,
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HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);
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input_set_abs_params(hp680_ts_dev, ABS_Y,
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HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0);
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hp680_ts_dev->name = "HP Jornada touchscreen";
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hp680_ts_dev->phys = "hp680_ts/input0";
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if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
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0, MODNAME, NULL) < 0) {
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printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
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HP680_TS_IRQ);
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err = -EBUSY;
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goto fail1;
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}
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err = input_register_device(hp680_ts_dev);
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if (err)
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goto fail2;
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return 0;
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fail2: free_irq(HP680_TS_IRQ, NULL);
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cancel_delayed_work_sync(&work);
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fail1: input_free_device(hp680_ts_dev);
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return err;
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}
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static void __exit hp680_ts_exit(void)
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{
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free_irq(HP680_TS_IRQ, NULL);
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cancel_delayed_work_sync(&work);
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input_unregister_device(hp680_ts_dev);
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}
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module_init(hp680_ts_init);
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module_exit(hp680_ts_exit);
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MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
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MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
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MODULE_LICENSE("GPL");
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