tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 PHDR 0xa400012e
19#define SCPDR 0xa4000136
20
21static void do_softint(void *data);
22
23static struct input_dev *hp680_ts_dev;
24static DECLARE_WORK(work, do_softint, 0);
25
26static void do_softint(void *data)
27{
28 int absx = 0, absy = 0;
29 u8 scpdr;
30 int touched = 0;
31
32 if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
33 scpdr = ctrl_inb(SCPDR);
34 scpdr |= SCPDR_TS_SCAN_ENABLE;
35 scpdr &= ~SCPDR_TS_SCAN_Y;
36 ctrl_outb(scpdr, SCPDR);
37 udelay(30);
38
39 absy = adc_single(ADC_CHANNEL_TS_Y);
40
41 scpdr = ctrl_inb(SCPDR);
42 scpdr |= SCPDR_TS_SCAN_Y;
43 scpdr &= ~SCPDR_TS_SCAN_X;
44 ctrl_outb(scpdr, SCPDR);
45 udelay(30);
46
47 absx = adc_single(ADC_CHANNEL_TS_X);
48
49 scpdr = ctrl_inb(SCPDR);
50 scpdr |= SCPDR_TS_SCAN_X;
51 scpdr &= ~SCPDR_TS_SCAN_ENABLE;
52 ctrl_outb(scpdr, SCPDR);
53 udelay(100);
54 touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
55 }
56
57 if (touched) {
58 input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
59 input_report_abs(hp680_ts_dev, ABS_X, absx);
60 input_report_abs(hp680_ts_dev, ABS_Y, absy);
61 } else {
62 input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
63 }
64
65 input_sync(hp680_ts_dev);
66 enable_irq(HP680_TS_IRQ);
67}
68
69static irqreturn_t hp680_ts_interrupt(int irq, void *dev, struct pt_regs *regs)
70{
71 disable_irq_nosync(irq);
72 schedule_delayed_work(&work, HZ / 20);
73
74 return IRQ_HANDLED;
75}
76
77static int __init hp680_ts_init(void)
78{
79 hp680_ts_dev = input_allocate_device();
80 if (!hp680_ts_dev)
81 return -ENOMEM;
82
83 hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
84 hp680_ts_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
85 hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
86
87 hp680_ts_dev->absmin[ABS_X] = HP680_TS_ABS_X_MIN;
88 hp680_ts_dev->absmin[ABS_Y] = HP680_TS_ABS_Y_MIN;
89 hp680_ts_dev->absmax[ABS_X] = HP680_TS_ABS_X_MAX;
90 hp680_ts_dev->absmax[ABS_Y] = HP680_TS_ABS_Y_MAX;
91
92 hp680_ts_dev->name = "HP Jornada touchscreen";
93 hp680_ts_dev->phys = "hp680_ts/input0";
94
95 input_register_device(hp680_ts_dev);
96
97 if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
98 IRQF_DISABLED, MODNAME, 0) < 0) {
99 printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
100 HP680_TS_IRQ);
101 input_unregister_device(hp680_ts_dev);
102 return -EBUSY;
103 }
104
105 return 0;
106}
107
108static void __exit hp680_ts_exit(void)
109{
110 free_irq(HP680_TS_IRQ, 0);
111 cancel_delayed_work(&work);
112 flush_scheduled_work();
113 input_unregister_device(hp680_ts_dev);
114}
115
116module_init(hp680_ts_init);
117module_exit(hp680_ts_exit);
118
119MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
120MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
121MODULE_LICENSE("GPL");