I have a problem reading from my hid-device using the hid module.
I managed to send commands to the device using the CSREPORT and
CSUSAGE, but i cant seem to get the information back from the device.
As i have writen the firmware myself, i know that the device responds to command
through
endpoint 0 (Control) and sends data back using endpoint 1(INT). The size of endpoint1
is 6byte.
But i cant seem to get these 6 bytes (or any) from the hiddev, just report using
CGREPORT, with 2byte-size.
How do i access the interrupt-transfer ?
I tried using the read() as described in hiddev.txt, but it only blocks/timeouts.
Is there any documentation/howto/example for reading from the hiddev ?
I also looked at the ups.c but couldn't get it to work for me.
I searched the net and the mailling-list archive, but didn't find anything useful.
Martin
the entry in /proc/bus/usb/devices is:
T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 7 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=1234 ProdID=1234 Rev= 0.01
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 6 Ivl=10ms
and i send a command to the device using :
fd=open("/dev/usb/hiddev0",O_RDWR);
struct hiddev_usage_ref uref;
struct hiddev_report_info rinfo;
uref.report_type=HID_REPORT_TYPE_OUTPUT;
uref.report_id=HID_REPORT_ID_FIRST;
uref.field_index=0;
uref.usage_index=0;
uref.usage_code=0x01;
uref.value=a;
ioctl(fd,HIDIOCSUSAGE,&uref)
uref.usage_index=1;
uref.value=b;
ioctl(fd,HIDIOCSUSAGE,&uref)
rinfo.report_type=HID_REPORT_TYPE_OUTPUT;
rinfo.report_id=HID_REPORT_ID_FIRST;
rinfo.num_fields=1;
ioctl(fd,HIDIOCSREPORT,&rinfo)
and the read I tried:
hiddev_event *buffer;
read(fd,buffer,sizeof(hiddev_event));
->timeout
or
void read_data(fd)
{
struct hiddev_usage_ref uref;
struct hiddev_report_info rinfo;
struct hiddev_field_info finfo;
struct hiddev_string_descriptor sdesc;
static char str[256];
int nret,i;
ioctl(fd,HIDIOCINITREPORT,0);
rinfo.report_type = HID_REPORT_TYPE_INPUT;
rinfo.report_id = HID_REPORT_ID_FIRST ;
ioctl( fd, HIDIOCGREPORTINFO, &rinfo);
finfo.report_type = rinfo.report_type;
finfo.report_id = rinfo.report_id;
finfo.field_index = 0;
ioctl(fd, HIDIOCGFIELDINFO, &finfo);
for (i=0;i<(int)finfo.maxusage;i++)
{
uref.report_type = finfo.report_type;
uref.report_id = finfo.report_id;
uref.field_index = 0;
uref.usage_index = i;
ioctl(fd, HIDIOCGUCODE, &uref);
printf("%d = %x\n",uref.value);
}
}
->nothing useful.
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