1#include <linux/input.h>
2#include <linux/module.h>
3#include <linux/init.h>
4#include <linux/interrupt.h>
5#include <asm/io.h>
6#include <asm/delay.h>
7#include <asm/adc.h>
8#include <mach/hp6xx.h>
9
10#define MODNAME "hp680_ts_input"
11
12#define HP680_TS_ABS_X_MIN	40
13#define HP680_TS_ABS_X_MAX	950
14#define HP680_TS_ABS_Y_MIN	80
15#define HP680_TS_ABS_Y_MAX	910
16
17#define	PHDR	0xa400012e
18#define SCPDR	0xa4000136
19
20static void do_softint(struct work_struct *work);
21
22static struct input_dev *hp680_ts_dev;
23static DECLARE_DELAYED_WORK(work, do_softint);
24
25static void do_softint(struct work_struct *work)
26{
27	int absx = 0, absy = 0;
28	u8 scpdr;
29	int touched = 0;
30
31	if (__raw_readb(PHDR) & PHDR_TS_PEN_DOWN) {
32		scpdr = __raw_readb(SCPDR);
33		scpdr |= SCPDR_TS_SCAN_ENABLE;
34		scpdr &= ~SCPDR_TS_SCAN_Y;
35		__raw_writeb(scpdr, SCPDR);
36		udelay(30);
37
38		absy = adc_single(ADC_CHANNEL_TS_Y);
39
40		scpdr = __raw_readb(SCPDR);
41		scpdr |= SCPDR_TS_SCAN_Y;
42		scpdr &= ~SCPDR_TS_SCAN_X;
43		__raw_writeb(scpdr, SCPDR);
44		udelay(30);
45
46		absx = adc_single(ADC_CHANNEL_TS_X);
47
48		scpdr = __raw_readb(SCPDR);
49		scpdr |= SCPDR_TS_SCAN_X;
50		scpdr &= ~SCPDR_TS_SCAN_ENABLE;
51		__raw_writeb(scpdr, SCPDR);
52		udelay(100);
53		touched = __raw_readb(PHDR) & PHDR_TS_PEN_DOWN;
54	}
55
56	if (touched) {
57		input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
58		input_report_abs(hp680_ts_dev, ABS_X, absx);
59		input_report_abs(hp680_ts_dev, ABS_Y, absy);
60	} else {
61		input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
62	}
63
64	input_sync(hp680_ts_dev);
65	enable_irq(HP680_TS_IRQ);
66}
67
68static irqreturn_t hp680_ts_interrupt(int irq, void *dev)
69{
70	disable_irq_nosync(irq);
71	schedule_delayed_work(&work, HZ / 20);
72
73	return IRQ_HANDLED;
74}
75
76static int __init hp680_ts_init(void)
77{
78	int err;
79
80	hp680_ts_dev = input_allocate_device();
81	if (!hp680_ts_dev)
82		return -ENOMEM;
83
84	hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
85	hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
86
87	input_set_abs_params(hp680_ts_dev, ABS_X,
88		HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);
89	input_set_abs_params(hp680_ts_dev, ABS_Y,
90		HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0);
91
92	hp680_ts_dev->name = "HP Jornada touchscreen";
93	hp680_ts_dev->phys = "hp680_ts/input0";
94
95	if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
96			0, MODNAME, NULL) < 0) {
97		printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
98		       HP680_TS_IRQ);
99		err = -EBUSY;
100		goto fail1;
101	}
102
103	err = input_register_device(hp680_ts_dev);
104	if (err)
105		goto fail2;
106
107	return 0;
108
109 fail2:	free_irq(HP680_TS_IRQ, NULL);
110	cancel_delayed_work_sync(&work);
111 fail1:	input_free_device(hp680_ts_dev);
112	return err;
113}
114
115static void __exit hp680_ts_exit(void)
116{
117	free_irq(HP680_TS_IRQ, NULL);
118	cancel_delayed_work_sync(&work);
119	input_unregister_device(hp680_ts_dev);
120}
121
122module_init(hp680_ts_init);
123module_exit(hp680_ts_exit);
124
125MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
126MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
127MODULE_LICENSE("GPL");
128