common/dfu.c

   1 /*
   2  * dfu.c -- dfu command
   3  *
   4  * Copyright (C) 2015
   5  * Lukasz Majewski <l.majewski@majess.pl>
   6  *
   7  * Copyright (C) 2012 Samsung Electronics
   8  * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
   9  *          Lukasz Majewski <l.majewski@samsung.com>
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <watchdog.h>
  16 #include <dfu.h>
  17 #include <console.h>
  18 #include <g_dnl.h>
  19 #include <usb.h>
  20 #include <net.h>
  21
  22 int run_usb_dnl_gadget(int usbctrl_index, char *usb_dnl_gadget)
  23 {
  24         bool dfu_reset = false;
  25         int ret, i = 0;
  26
  27         board_usb_init(usbctrl_index, USB_INIT_DEVICE);
  28         g_dnl_clear_detach();
  29         g_dnl_register(usb_dnl_gadget);
  30         while (1) {
  31                 if (g_dnl_detach()) {
  32                         /*
  33                          * Check if USB bus reset is performed after detach,
  34                          * which indicates that -R switch has been passed to
  35                          * dfu-util. In this case reboot the device
  36                          */
  37                         if (dfu_usb_get_reset()) {
  38                                 dfu_reset = true;
  39                                 goto exit;
  40                         }
  41
  42                         /*
  43                          * This extra number of usb_gadget_handle_interrupts()
  44                          * calls is necessary to assure correct transmission
  45                          * completion with dfu-util
  46                          */
  47                         if (++i == 10000)
  48                                 goto exit;
  49                 }
  50
  51                 if (ctrlc())
  52                         goto exit;
  53
  54                 if (dfu_get_defer_flush()) {
  55                         /*
  56                          * Call to usb_gadget_handle_interrupts() is necessary
  57                          * to act on ZLP OUT transaction from HOST PC after
  58                          * transmitting the whole file.
  59                          *
  60                          * If this ZLP OUT packet is NAK'ed, the HOST libusb
  61                          * function fails after timeout (by default it is set to
  62                          * 5 seconds). In such situation the dfu-util program
  63                          * exits with error message.
  64                          */
  65                         usb_gadget_handle_interrupts(usbctrl_index);
  66                         ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
  67                         dfu_set_defer_flush(NULL);
  68                         if (ret) {
  69                                 error("Deferred dfu_flush() failed!");
  70                                 goto exit;
  71                         }
  72                 }
  73
  74                 WATCHDOG_RESET();
  75                 usb_gadget_handle_interrupts(usbctrl_index);
  76         }
  77 exit:
  78         g_dnl_unregister();
  79         board_usb_cleanup(usbctrl_index, USB_INIT_DEVICE);
  80
  81         if (dfu_reset)
  82                 run_command("reset", 0);
  83
  84         g_dnl_clear_detach();
  85
  86         return ret;
  87 }