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         ret = board_usb_init(usbctrl_index, USB_INIT_DEVICE);
  28         if (ret) {
  29                 pr_err("board usb init failed\n");
  30                 return CMD_RET_FAILURE;
  31         }
  32         g_dnl_clear_detach();
  33         ret = g_dnl_register(usb_dnl_gadget);
  34         if (ret) {
  35                 pr_err("g_dnl_register failed");
  36                 return CMD_RET_FAILURE;
  37         }
  38
  39         while (1) {
  40                 if (g_dnl_detach()) {
  41                         /*
  42                          * Check if USB bus reset is performed after detach,
  43                          * which indicates that -R switch has been passed to
  44                          * dfu-util. In this case reboot the device
  45                          */
  46                         if (dfu_usb_get_reset()) {
  47                                 dfu_reset = true;
  48                                 goto exit;
  49                         }
  50
  51                         /*
  52                          * This extra number of usb_gadget_handle_interrupts()
  53                          * calls is necessary to assure correct transmission
  54                          * completion with dfu-util
  55                          */
  56                         if (++i == 10000)
  57                                 goto exit;
  58                 }
  59
  60                 if (ctrlc())
  61                         goto exit;
  62
  63                 if (dfu_get_defer_flush()) {
  64                         /*
  65                          * Call to usb_gadget_handle_interrupts() is necessary
  66                          * to act on ZLP OUT transaction from HOST PC after
  67                          * transmitting the whole file.
  68                          *
  69                          * If this ZLP OUT packet is NAK'ed, the HOST libusb
  70                          * function fails after timeout (by default it is set to
  71                          * 5 seconds). In such situation the dfu-util program
  72                          * exits with error message.
  73                          */
  74                         usb_gadget_handle_interrupts(usbctrl_index);
  75                         ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
  76                         dfu_set_defer_flush(NULL);
  77                         if (ret) {
  78                                 pr_err("Deferred dfu_flush() failed!");
  79                                 goto exit;
  80                         }
  81                 }
  82
  83                 WATCHDOG_RESET();
  84                 usb_gadget_handle_interrupts(usbctrl_index);
  85         }
  86 exit:
  87         g_dnl_unregister();
  88         board_usb_cleanup(usbctrl_index, USB_INIT_DEVICE);
  89
  90         if (dfu_reset)
  91                 do_reset(NULL, 0, 0, NULL);
  92
  93         g_dnl_clear_detach();
  94
  95         return ret;
  96 }