Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux
[linux-2.6] / drivers / input / touchscreen / hp680_ts_input.c
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.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
21 static void do_softint(void *data);
22
23 static struct input_dev *hp680_ts_dev;
24 static DECLARE_WORK(work, do_softint);
25
26 static 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
69 static irqreturn_t hp680_ts_interrupt(int irq, void *dev)
70 {
71         disable_irq_nosync(irq);
72         schedule_delayed_work(&work, HZ / 20);
73
74         return IRQ_HANDLED;
75 }
76
77 static int __init hp680_ts_init(void)
78 {
79         int err;
80
81         hp680_ts_dev = input_allocate_device();
82         if (!hp680_ts_dev)
83                 return -ENOMEM;
84
85         hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
86         hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
87
88         input_set_abs_params(hp680_ts_dev, ABS_X,
89                 HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);
90         input_set_abs_params(hp680_ts_dev, ABS_Y,
91                 HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0);
92
93         hp680_ts_dev->name = "HP Jornada touchscreen";
94         hp680_ts_dev->phys = "hp680_ts/input0";
95
96         if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,
97                         IRQF_DISABLED, MODNAME, 0) < 0) {
98                 printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",
99                        HP680_TS_IRQ);
100                 err = -EBUSY;
101                 goto fail1;
102         }
103
104         err = input_register_device(hp680_ts_dev);
105         if (err)
106                 goto fail2;
107
108         return 0;
109
110  fail2: free_irq(HP680_TS_IRQ, NULL);
111         cancel_delayed_work(&work);
112         flush_scheduled_work();
113  fail1: input_free_device(hp680_ts_dev);
114         return err;
115 }
116
117 static void __exit hp680_ts_exit(void)
118 {
119         free_irq(HP680_TS_IRQ, NULL);
120         cancel_delayed_work(&work);
121         flush_scheduled_work();
122         input_unregister_device(hp680_ts_dev);
123 }
124
125 module_init(hp680_ts_init);
126 module_exit(hp680_ts_exit);
127
128 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
129 MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
130 MODULE_LICENSE("GPL");