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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/input/touchscreen/hp680_ts_input.c
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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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			IRQF_DISABLED, MODNAME, 0) < 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, [email protected]");

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MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");

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MODULE_LICENSE("GPL");

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