1 #include <linux/input.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
5 #include <linux/interrupt.h>
9 #include <asm/hp6xx/hp6xx.h>
11 #define MODNAME "hp680_ts_input"
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
18 #define PHDR 0xa400012e
19 #define SCPDR 0xa4000136
21 static void do_softint(void *data
);
23 static struct input_dev
*hp680_ts_dev
;
24 static DECLARE_WORK(work
, do_softint
, 0);
26 static void do_softint(void *data
)
28 int absx
= 0, absy
= 0;
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
);
39 absy
= adc_single(ADC_CHANNEL_TS_Y
);
41 scpdr
= ctrl_inb(SCPDR
);
42 scpdr
|= SCPDR_TS_SCAN_Y
;
43 scpdr
&= ~SCPDR_TS_SCAN_X
;
44 ctrl_outb(scpdr
, SCPDR
);
47 absx
= adc_single(ADC_CHANNEL_TS_X
);
49 scpdr
= ctrl_inb(SCPDR
);
50 scpdr
|= SCPDR_TS_SCAN_X
;
51 scpdr
&= ~SCPDR_TS_SCAN_ENABLE
;
52 ctrl_outb(scpdr
, SCPDR
);
54 touched
= ctrl_inb(PHDR
) & PHDR_TS_PEN_DOWN
;
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
);
62 input_report_key(hp680_ts_dev
, BTN_TOUCH
, 0);
65 input_sync(hp680_ts_dev
);
66 enable_irq(HP680_TS_IRQ
);
69 static irqreturn_t
hp680_ts_interrupt(int irq
, void *dev
, struct pt_regs
*regs
)
71 disable_irq_nosync(irq
);
72 schedule_delayed_work(&work
, HZ
/ 20);
77 static int __init
hp680_ts_init(void)
79 hp680_ts_dev
= input_allocate_device();
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
);
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
;
92 hp680_ts_dev
->name
= "HP Jornada touchscreen";
93 hp680_ts_dev
->phys
= "hp680_ts/input0";
95 input_register_device(hp680_ts_dev
);
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",
101 input_unregister_device(hp680_ts_dev
);
108 static void __exit
hp680_ts_exit(void)
110 free_irq(HP680_TS_IRQ
, 0);
111 cancel_delayed_work(&work
);
112 flush_scheduled_work();
113 input_unregister_device(hp680_ts_dev
);
116 module_init(hp680_ts_init
);
117 module_exit(hp680_ts_exit
);
119 MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");
120 MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");
121 MODULE_LICENSE("GPL");