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 SCPCR 0xa4000116
19#define PHDR 0xa400012e
20#define SCPDR 0xa4000136
21
22static void do_softint(void *data);
23
24static struct input_dev *hp680_ts_dev;
25static DECLARE_WORK(work, do_softint, 0);
26
27static void do_softint(void *data)
28{
29 int absx = 0, absy = 0;
30 u8 scpdr;
31 int touched = 0;
32
33 if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
34 scpdr = ctrl_inb(SCPDR);
35 scpdr |= SCPDR_TS_SCAN_ENABLE;
36 scpdr &= ~SCPDR_TS_SCAN_Y;
37 ctrl_outb(scpdr, SCPDR);
38 udelay(30);
39
40 absy = adc_single(ADC_CHANNEL_TS_Y);
41
42 scpdr = ctrl_inb(SCPDR);
43 scpdr |= SCPDR_TS_SCAN_Y;
44 scpdr &= ~SCPDR_TS_SCAN_X;
45 ctrl_outb(scpdr, SCPDR);
46 udelay(30);
47
48 absx = adc_single(ADC_CHANNEL_TS_X);
49
50 scpdr = ctrl_inb(SCPDR);
51 scpdr |= SCPDR_TS_SCAN_X;
52 scpdr &= ~SCPDR_TS_SCAN_ENABLE;
53 ctrl_outb(scpdr, SCPDR);
54 udelay(100);
55 touched = ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN;
56 }
57
58 if (touched) {
59 input_report_key(hp680_ts_dev, BTN_TOUCH, 1);
60 input_report_abs(hp680_ts_dev, ABS_X, absx);
61 input_report_abs(hp680_ts_dev, ABS_Y, absy);
62 } else {
63 input_report_key(hp680_ts_dev, BTN_TOUCH, 0);
64 }
65
66 input_sync(hp680_ts_dev);
67 enable_irq(HP680_TS_IRQ);
68}
69
70static irqreturn_t hp680_ts_interrupt(int irq, void *dev, struct pt_regs *regs)
71{
72 disable_irq_nosync(irq);
73 schedule_delayed_work(&work, HZ / 20);
74
75 return IRQ_HANDLED;
76}
77
78static int __init hp680_ts_init(void)
79{
80 u8 scpdr;
81 u16 scpcr;
82
83 scpdr = ctrl_inb(SCPDR);
84 scpdr |= SCPDR_TS_SCAN_X | SCPDR_TS_SCAN_Y;
85 scpdr &= ~SCPDR_TS_SCAN_ENABLE;
86 ctrl_outb(scpdr, SCPDR);
87
88 scpcr = ctrl_inw(SCPCR);
89 scpcr &= ~SCPCR_TS_MASK;
90 scpcr |= SCPCR_TS_ENABLE;
91 ctrl_outw(scpcr, SCPCR);
92
93 hp680_ts_dev = input_allocate_device();
94 if (!hp680_ts_dev)
95 return -ENOMEM;
96
97 hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
98 hp680_ts_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
99 hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
100
101 hp680_ts_dev->absmin[ABS_X] = HP680_TS_ABS_X_MIN;
102 hp680_ts_dev->absmin[ABS_Y] = HP680_TS_ABS_Y_MIN;
103 hp680_ts_dev->absmax[ABS_X] = HP680_TS_ABS_X_MAX;
104 hp680_ts_dev->absmax[ABS_Y] = HP680_TS_ABS_Y_MAX;
105
106 hp680_ts_dev->name = "HP Jornada touchscreen";
107 hp680_ts_dev->phys = "hp680_ts/input0";
108
109 input_register_device(hp680_ts_dev);
110
111 if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
112 IRQF_DISABLED, 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
122static 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
130module_init(hp680_ts_init);
131module_exit(hp680_ts_exit);
132
133MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
134MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
135MODULE_LICENSE("GPL");