Hi there,
I have a usb smart card reader DT3500 and the driver I wrote can run
on kernel 2.6.11. Now I port it to kernel 2.6.14. Some exception
occur. usb_bulk_msg returns EILSEQ.
ret = read(SmartCard[readerNum].fd, buffer, sizeof(buffer));
PRINTFD("read %d\n", ret);
if (ret != 4)
return IFD_COMMUNICATION_ERROR;
The above snippet which returns -1 will call the function "skel_read"
in the kernel module driver DT3500.c which returns -84. In fact, the
error occurs when "usb_bulk_msg" is called in skel_read. I check
errno.h and find that 84 is the error number of
#define EILSEQ 84 /* Illegal byte sequence */
The snippet in skel_read is :
......
/* do a blocking bulk read to get data from the device */
retval = usb_bulk_msg(dev->udev,
usb_rcvbulkpipe(dev->udev,
dev->bulk_in_endpointAddr),
dev->bulk_in_buffer,
//min(dev->bulk_in_size, count),
dev->bulk_in_size,
&count, HZ*10);
err("retval of skel_read %d", retval);
......
Reading Documentation/usb/error-codes.txt, I find that:
a) CRC mismatch
b) no response packet received within the
prescribed bus turn-around time
c) unknown USB error
How to make sure what the matter really is? I still can't understand
why the same code can run on kernel 2.6.11 but fail on kernel 2.6.14.
:(
Thanks in advanced.
Best Regards,
TowerGee
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