[deliverable/linux.git] / drivers / input / touchscreen / 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/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 char *hp680_ts_name = "HP Jornada touchscreen";
static char *hp680_ts_phys = "input0";

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);

	memset(&hp680_ts_dev, 0, sizeof(hp680_ts_dev));
	init_input_dev(&hp680_ts_dev);

	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 = hp680_ts_name;
	hp680_ts_dev.phys = hp680_ts_phys;
	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");
Commit	Line	Data
1da177e4 LT	1	#include <linux/input.h>
	2	#include <linux/module.h>
	3	#include <linux/init.h>
	4
	5	#include <linux/interrupt.h>
	6	#include <asm/io.h>
	7	#include <asm/delay.h>
	8	#include <asm/adc.h>
	9	#include <asm/hp6xx/hp6xx.h>
	10
	11	#define MODNAME "hp680_ts_input"
	12
	13	#define HP680_TS_ABS_X_MIN 40
	14	#define HP680_TS_ABS_X_MAX 950
	15	#define HP680_TS_ABS_Y_MIN 80
	16	#define HP680_TS_ABS_Y_MAX 910
	17
	18	#define SCPCR 0xa4000116
	19	#define PHDR 0xa400012e
	20	#define SCPDR 0xa4000136
	21
	22	static void do_softint(void *data);
	23
	24	static struct input_dev hp680_ts_dev;
	25	static DECLARE_WORK(work, do_softint, 0);
	26	static char *hp680_ts_name = "HP Jornada touchscreen";
	27	static char *hp680_ts_phys = "input0";
	28
	29	static void do_softint(void *data)
	30	{
	31	int absx = 0, absy = 0;
	32	u8 scpdr;
	33	int touched = 0;
	34
	35	if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
	36	scpdr = ctrl_inb(SCPDR);
	37	scpdr \|= SCPDR_TS_SCAN_ENABLE;
	38	scpdr &= ~SCPDR_TS_SCAN_Y;
	39	ctrl_outb(scpdr, SCPDR);
	40	udelay(30);
	41
	42	absy = adc_single(ADC_CHANNEL_TS_Y);
	43
	44	scpdr = ctrl_inb(SCPDR);
	45	scpdr \|= SCPDR_TS_SCAN_Y;
	46	scpdr &= ~SCPDR_TS_SCAN_X;
	47	ctrl_outb(scpdr, SCPDR);
	48	udelay(30);
	49
	50	absx = adc_single(ADC_CHANNEL_TS_X);
	51
	52	scpdr = ctrl_inb(SCPDR);
	53	scpdr \|= SCPDR_TS_SCAN_X;
	54	scpdr &= ~SCPDR_TS_SCAN_ENABLE;
	55	ctrl_outb(scpdr, SCPDR);
	56	udelay(100);
	57	touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
	58	}
	59
	60	if (touched) {
	61	input_report_key(&hp680_ts_dev, BTN_TOUCH, 1);
	62	input_report_abs(&hp680_ts_dev, ABS_X, absx);
	63	input_report_abs(&hp680_ts_dev, ABS_Y, absy);
	64	} else {
65	input_report_key(&hp680_ts_dev, BTN_TOUCH, 0);
66	}
67
68	input_sync(&hp680_ts_dev);
69	enable_irq(HP680_TS_IRQ);
70	}
71
72	static irqreturn_t hp680_ts_interrupt(int irq, void dev, struct pt_regs regs)
73	{
74	disable_irq_nosync(irq);
75	schedule_delayed_work(&work, HZ / 20);
76
77	return IRQ_HANDLED;
78	}
79
80	static int __init hp680_ts_init(void)
81	{
82	u8 scpdr;
83	u16 scpcr;
84
85	scpdr = ctrl_inb(SCPDR);
86	scpdr \|= SCPDR_TS_SCAN_X \| SCPDR_TS_SCAN_Y;
87	scpdr &= ~SCPDR_TS_SCAN_ENABLE;
88	ctrl_outb(scpdr, SCPDR);
89
90	scpcr = ctrl_inw(SCPCR);
91	scpcr &= ~SCPCR_TS_MASK;
92	scpcr \|= SCPCR_TS_ENABLE;
93	ctrl_outw(scpcr, SCPCR);
94
95	memset(&hp680_ts_dev, 0, sizeof(hp680_ts_dev));
96	init_input_dev(&hp680_ts_dev);
97
98	hp680_ts_dev.evbit[0] = BIT(EV_ABS) \| BIT(EV_KEY);
99	hp680_ts_dev.absbit[0] = BIT(ABS_X) \| BIT(ABS_Y);
100	hp680_ts_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
101
102	hp680_ts_dev.absmin[ABS_X] = HP680_TS_ABS_X_MIN;
103	hp680_ts_dev.absmin[ABS_Y] = HP680_TS_ABS_Y_MIN;
104	hp680_ts_dev.absmax[ABS_X] = HP680_TS_ABS_X_MAX;
105	hp680_ts_dev.absmax[ABS_Y] = HP680_TS_ABS_Y_MAX;
106
107	hp680_ts_dev.name = hp680_ts_name;
108	hp680_ts_dev.phys = hp680_ts_phys;
109	input_register_device(&hp680_ts_dev);
110
111	if (request_irq
112	(HP680_TS_IRQ, hp680_ts_interrupt, SA_INTERRUPT, MODNAME, 0) < 0) {
113	printk(KERN_ERR "hp680_touchscreen.c : Can't allocate irq %d\n",
114	HP680_TS_IRQ);
115	input_unregister_device(&hp680_ts_dev);
116	return -EBUSY;
117	}
118
119	return 0;
120	}
121
122	static void __exit hp680_ts_exit(void)
123	{
124	free_irq(HP680_TS_IRQ, 0);
125	cancel_delayed_work(&work);
126	flush_scheduled_work();
127	input_unregister_device(&hp680_ts_dev);
128	}
129
130	module_init(hp680_ts_init);
131	module_exit(hp680_ts_exit);
132
133	MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
134	MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
135	MODULE_LICENSE("GPL");