[POWERPC] Walnut zImage wrapper
[wrt350n-kernel.git] / drivers / input / touchscreen / hp680_ts_input.c
blob1a15475aedfcc269d5bbfc033c15db3025a3dd5b
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>
10 #define MODNAME "hp680_ts_input"
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
17 #define PHDR 0xa400012e
18 #define SCPDR 0xa4000136
20 static void do_softint(struct work_struct *work);
22 static struct input_dev *hp680_ts_dev;
23 static DECLARE_DELAYED_WORK(work, do_softint);
25 static void do_softint(struct work_struct *work)
27 int absx = 0, absy = 0;
28 u8 scpdr;
29 int touched = 0;
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);
38 absy = adc_single(ADC_CHANNEL_TS_Y);
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);
46 absx = adc_single(ADC_CHANNEL_TS_X);
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;
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);
64 input_sync(hp680_ts_dev);
65 enable_irq(HP680_TS_IRQ);
68 static irqreturn_t hp680_ts_interrupt(int irq, void *dev)
70 disable_irq_nosync(irq);
71 schedule_delayed_work(&work, HZ / 20);
73 return IRQ_HANDLED;
76 static int __init hp680_ts_init(void)
78 int err;
80 hp680_ts_dev = input_allocate_device();
81 if (!hp680_ts_dev)
82 return -ENOMEM;
84 hp680_ts_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
85 hp680_ts_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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);
92 hp680_ts_dev->name = "HP Jornada touchscreen";
93 hp680_ts_dev->phys = "hp680_ts/input0";
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;
103 err = input_register_device(hp680_ts_dev);
104 if (err)
105 goto fail2;
107 return 0;
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;
116 static void __exit hp680_ts_exit(void)
118 free_irq(HP680_TS_IRQ, NULL);
119 cancel_delayed_work(&work);
120 flush_scheduled_work();
121 input_unregister_device(hp680_ts_dev);
124 module_init(hp680_ts_init);
125 module_exit(hp680_ts_exit);
127 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
128 MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
129 MODULE_LICENSE("GPL");