static int download_tail(long long int left, int cnt)
{
struct dfu_entity *dfu_entity = dfu_get_entity(alt_setting_num);
void *transfer_buffer = dfu_get_buf();
int ret;
debug("%s: left: %llu cnt: %d\n", __func__, left, cnt);
if (left) {
ret = dfu_write(dfu_entity, transfer_buffer, left, cnt++);
if (ret) {
error("DFU write failed [%d]: left: %llu", ret, left);
return ret;
}
}
/*
* To store last "packet" or write file from buffer to filesystem
* DFU storage backend requires dfu_flush
*
* This also frees memory malloc'ed by dfu_get_buf(), so no explicit
* need fo call dfu_free_buf() is needed.
*/
ret = dfu_flush(dfu_entity, transfer_buffer, 0, cnt);
if (ret)
error("DFU flush failed!");
return ret;
}
int run_usb_dnl_gadget(int usbctrl_index, char *usb_dnl_gadget)
{
bool dfu_reset = false;
int ret, i = 0;
ret = board_usb_init(usbctrl_index, USB_INIT_DEVICE);
if (ret) {
pr_err("board usb init failed\n");
return CMD_RET_FAILURE;
}
g_dnl_clear_detach();
ret = g_dnl_register(usb_dnl_gadget);
if (ret) {
pr_err("g_dnl_register failed");
return CMD_RET_FAILURE;
}
while (1) {
if (g_dnl_detach()) {
/*
* Check if USB bus reset is performed after detach,
* which indicates that -R switch has been passed to
* dfu-util. In this case reboot the device
*/
if (dfu_usb_get_reset()) {
dfu_reset = true;
goto exit;
}
/*
* This extra number of usb_gadget_handle_interrupts()
* calls is necessary to assure correct transmission
* completion with dfu-util
*/
if (++i == 10000)
goto exit;
}
if (ctrlc())
goto exit;
if (dfu_get_defer_flush()) {
/*
* Call to usb_gadget_handle_interrupts() is necessary
* to act on ZLP OUT transaction from HOST PC after
* transmitting the whole file.
*
* If this ZLP OUT packet is NAK'ed, the HOST libusb
* function fails after timeout (by default it is set to
* 5 seconds). In such situation the dfu-util program
* exits with error message.
*/
usb_gadget_handle_interrupts(usbctrl_index);
ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
dfu_set_defer_flush(NULL);
if (ret) {
pr_err("Deferred dfu_flush() failed!");
goto exit;
}
}
WATCHDOG_RESET();
usb_gadget_handle_interrupts(usbctrl_index);
}
exit:
g_dnl_unregister();
board_usb_cleanup(usbctrl_index, USB_INIT_DEVICE);
if (dfu_reset)
do_reset(NULL, 0, 0, NULL);
g_dnl_clear_detach();
return ret;
}
