1 #include <linux/input.h>
2 #include <linux/module.h>
3 #include <linux/init.h>
4 #include <linux/interrupt.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;
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
);
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
);
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
);
53 touched
= ctrl_inb(PHDR
) & PHDR_TS_PEN_DOWN
;
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
);
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);
76 static int __init
hp680_ts_init(void)
80 hp680_ts_dev
= input_allocate_device();
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",
103 err
= input_register_device(hp680_ts_dev
);
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
);
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");