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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <usb.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
#define MAX_READ_WRITE 4096
#define USB_ERROR_STR(ret, x, args...) return ret
static int usb_get_fd(usb_dev_handle *uh)
{
return *((int *)uh);
}
int __usb_bulk_write(usb_dev_handle *dev, int ep, char *bytes, int length,
int timeout)
{
struct usbdevfs_bulktransfer bulk;
int ret, sent = 0;
/* Ensure the endpoint address is correct */
ep &= ~USB_ENDPOINT_IN;
do {
bulk.ep = ep;
bulk.len = length - sent;
if (bulk.len > MAX_READ_WRITE)
bulk.len = MAX_READ_WRITE;
bulk.timeout = timeout;
bulk.data = (unsigned char *)bytes + sent;
ret = ioctl(usb_get_fd(dev), USBDEVFS_BULK, &bulk);
if (ret < 0)
USB_ERROR_STR(ret,
"error writing to bulk endpoint %d: %s",
ep, strerror(errno));
sent += ret;
} while (ret > 0 && sent < length);
return sent;
}
int __usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, int size,
int timeout)
{
struct usbdevfs_bulktransfer bulk;
int ret, retrieved = 0, requested;
/* Ensure the endpoint address is correct */
ep |= USB_ENDPOINT_IN;
do {
bulk.ep = ep;
requested = size - retrieved;
if (requested > MAX_READ_WRITE)
requested = MAX_READ_WRITE;
bulk.len = requested;
bulk.timeout = timeout;
bulk.data = (unsigned char *)bytes + retrieved;
ret = ioctl(usb_get_fd(dev), USBDEVFS_BULK, &bulk);
if (ret < 0)
USB_ERROR_STR(ret,
"error reading from bulk endpoint 0x%x: %s",
ep, strerror(errno));
retrieved += ret;
} while (ret > 0 && retrieved < size && ret == requested);
return retrieved;
}
int __usb_reattach_kernel_driver_np(usb_dev_handle *dev, int interface)
{
struct usbdevfs_ioctl command;
command.ifno = interface;
command.ioctl_code = USBDEVFS_CONNECT;
command.data = NULL;
return ioctl(usb_get_fd(dev), USBDEVFS_IOCTL, &command);
}
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