common/dfu.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * dfu.c -- dfu command
   4  *
   5  * Copyright (C) 2015
   6  * Lukasz Majewski <l.majewski@majess.pl>
   7  *
   8  * Copyright (C) 2012 Samsung Electronics
   9  * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
  10  *          Lukasz Majewski <l.majewski@samsung.com>
  11  */
  12
  13 #include <common.h>
  14 #include <watchdog.h>
  15 #include <dfu.h>
  16 #include <console.h>
  17 #include <g_dnl.h>
  18 #include <usb.h>
  19 #include <net.h>
  20
  21 int run_usb_dnl_gadget(int usbctrl_index, char *usb_dnl_gadget)
  22 {
  23         bool dfu_reset = false;
  24         int ret, i = 0;
  25
  26         ret = usb_gadget_initialize(usbctrl_index);
  27         if (ret) {
  28                 pr_err("usb_gadget_initialize failed\n");
  29                 return CMD_RET_FAILURE;
  30         }
  31         g_dnl_clear_detach();
  32         ret = g_dnl_register(usb_dnl_gadget);
  33         if (ret) {
  34                 pr_err("g_dnl_register failed");
  35                 return CMD_RET_FAILURE;
  36         }
  37
  38         while (1) {
  39                 if (g_dnl_detach()) {
  40                         /*
  41                          * Check if USB bus reset is performed after detach,
  42                          * which indicates that -R switch has been passed to
  43                          * dfu-util. In this case reboot the device
  44                          */
  45                         if (dfu_usb_get_reset()) {
  46                                 dfu_reset = true;
  47                                 goto exit;
  48                         }
  49
  50                         /*
  51                          * This extra number of usb_gadget_handle_interrupts()
  52                          * calls is necessary to assure correct transmission
  53                          * completion with dfu-util
  54                          */
  55                         if (++i == 10000)
  56                                 goto exit;
  57                 }
  58
  59                 if (ctrlc())
  60                         goto exit;
  61
  62                 if (dfu_get_defer_flush()) {
  63                         /*
  64                          * Call to usb_gadget_handle_interrupts() is necessary
  65                          * to act on ZLP OUT transaction from HOST PC after
  66                          * transmitting the whole file.
  67                          *
  68                          * If this ZLP OUT packet is NAK'ed, the HOST libusb
  69                          * function fails after timeout (by default it is set to
  70                          * 5 seconds). In such situation the dfu-util program
  71                          * exits with error message.
  72                          */
  73                         usb_gadget_handle_interrupts(usbctrl_index);
  74                         ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
  75                         dfu_set_defer_flush(NULL);
  76                         if (ret) {
  77                                 pr_err("Deferred dfu_flush() failed!");
  78                                 goto exit;
  79                         }
  80                 }
  81
  82                 WATCHDOG_RESET();
  83                 usb_gadget_handle_interrupts(usbctrl_index);
  84         }
  85 exit:
  86         g_dnl_unregister();
  87         usb_gadget_release(usbctrl_index);
  88
  89         if (dfu_reset)
  90                 do_reset(NULL, 0, 0, NULL);
  91
  92         g_dnl_clear_detach();
  93
  94         return ret;
  95 }