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List:       linux-arm-kernel
Subject:    Segfault when reading event device.
From:       "Robertson, Ezban" <ezban.robertson () homeauto ! com>
Date:       2005-06-28 15:59:12
Message-ID: ED3CB89794C8C9469511DFC53A8C737030C76B () sbs2003 ! HAI ! local
[Download RAW message or body]

I've ran into a problem while reading the event device 0 (a touch panel
device). The driver is working after being able to execute ts_calibrate,
but executing the code fragment below from an app causes a seg fault and
I not sure why.
Maybe someone can identify what's possibly wrong.


	  struct ts_event event;

        /* read a data point */
        
        ret = ts_read(ts,&event,1);
        if(ret < 0 ) {
                EPRINTF("[%s] Error %d reading from touch panel\n",
TS_DEVICE, errno);
                return -1;
                }

Where ts_event is
		{
		int x;
		int y;
		unsigned int pressure;
		struct timeval timestamp;
		}

    ts_read in the source is doing a ts->list->ops->read(ts->list, samp,
nr);

Msg log:

#
createfont: (height == 0) found builtin font System (0)
PD_OPEN: TS DEVICE: /dev/input/event0: fd: 5
createfont: (height == 0) found builtin font System (0)
CLCD: SINGLE PANEL
CLCD: LCD is in Color STN Interface
CLCD: 16 BPP mode
CLCD: disabling LCD
CLCD: enabling LCD
CLCD: Registers set to
 TIM0: 0505054c TIM1: 000000ef TIM2: 007707d7 TIM3: 00000000
 UBAS: c1c00000 LBAS: c1c12c00 IENB: 00000000 CNTL: 00010909
PD_Read
signal 11 caught

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