Merge branch 'for-2.6.25' of git://git.kernel.dk/linux-2.6-block
[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 #include <linux/interrupt.h>
5 #include <asm/io.h>
6 #include <asm/delay.h>
7 #include <asm/adc.h>
8 #include <asm/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
20 static void do_softint(struct work_struct *work);
21
22 static struct input_dev *hp680_ts_dev;
23 static DECLARE_DELAYED_WORK(work, do_softint);
24
25 static void do_softint(struct work_struct *work)
26 {
27         int absx = 0, absy = 0;
28         u8 scpdr;
29         int touched = 0;
30
31         if (ctrl_inb(PHDR) & PHDR_TS_PEN_DOWN) {
32                 scpdr = ctrl_inb(SCPDR);
33                 scpdr |= SCPDR_TS_SCAN_ENABLE;
34                 scpdr &= ~SCPDR_TS_SCAN_Y;
35                 ctrl_outb(scpdr, SCPDR);
36                 udelay(30);
37
38                 absy = adc_single(ADC_CHANNEL_TS_Y);
39
40                 scpdr = ctrl_inb(SCPDR);
41                 scpdr |= SCPDR_TS_SCAN_Y;
42                 scpdr &= ~SCPDR_TS_SCAN_X;
43                 ctrl_outb(scpdr, SCPDR);
44                 udelay(30);
45
46                 absx = adc_single(ADC_CHANNEL_TS_X);
47
48                 scpdr = ctrl_inb(SCPDR);
49                 scpdr |= SCPDR_TS_SCAN_X;
50                 scpdr &= ~SCPDR_TS_SCAN_ENABLE;
51                 ctrl_outb(scpdr, SCPDR);
52                 udelay(100);
53                 touched = ctrl_inb(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
68 static 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
76 static 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                         IRQF_DISABLED, MODNAME, 0) < 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(&work);
111         flush_scheduled_work();
112  fail1: input_free_device(hp680_ts_dev);
113         return err;
114 }
115
116 static void __exit hp680_ts_exit(void)
117 {
118         free_irq(HP680_TS_IRQ, NULL);
119         cancel_delayed_work(&work);
120         flush_scheduled_work();
121         input_unregister_device(hp680_ts_dev);
122 }
123
124 module_init(hp680_ts_init);
125 module_exit(hp680_ts_exit);
126
127 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
128 MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
129 MODULE_LICENSE("GPL");