drivers/usb/gadget/g_dnl.c

   1 /*
   2  * g_dnl.c -- USB Downloader Gadget
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * Lukasz Majewski  <l.majewski@samsung.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <errno.h>
  11 #include <common.h>
  12 #include <malloc.h>
  13
  14 #include <mmc.h>
  15 #include <part.h>
  16
  17 #include <g_dnl.h>
  18 #include "f_dfu.h"
  19
  20 #include "gadget_chips.h"
  21 #include "composite.c"
  22 #include "f_mass_storage.c"
  23
  24 /*
  25  * One needs to define the following:
  26  * CONFIG_G_DNL_VENDOR_NUM
  27  * CONFIG_G_DNL_PRODUCT_NUM
  28  * CONFIG_G_DNL_MANUFACTURER
  29  * at e.g. ./include/configs/<board>.h
  30  */
  31
  32 #define STRING_MANUFACTURER 25
  33 #define STRING_PRODUCT 2
  34 /* Index of String Descriptor describing this configuration */
  35 #define STRING_USBDOWN 2
  36 /* Number of supported configurations */
  37 #define CONFIGURATION_NUMBER 1
  38
  39 #define DRIVER_VERSION          "usb_dnl 2.0"
  40
  41 static const char shortname[] = "usb_dnl_";
  42 static const char product[] = "USB download gadget";
  43 static const char manufacturer[] = CONFIG_G_DNL_MANUFACTURER;
  44
  45 static struct usb_device_descriptor device_desc = {
  46         .bLength = sizeof device_desc,
  47         .bDescriptorType = USB_DT_DEVICE,
  48
  49         .bcdUSB = __constant_cpu_to_le16(0x0200),
  50         .bDeviceClass = USB_CLASS_COMM,
  51         .bDeviceSubClass = 0x02, /*0x02:CDC-modem , 0x00:CDC-serial*/
  52
  53         .idVendor = __constant_cpu_to_le16(CONFIG_G_DNL_VENDOR_NUM),
  54         .idProduct = __constant_cpu_to_le16(CONFIG_G_DNL_PRODUCT_NUM),
  55         .iProduct = STRING_PRODUCT,
  56         .bNumConfigurations = 1,
  57 };
  58
  59 /*
  60  * static strings, in UTF-8
  61  * IDs for those strings are assigned dynamically at g_dnl_bind()
  62  */
  63 static struct usb_string g_dnl_string_defs[] = {
  64         {.s = manufacturer},
  65         {.s = product},
  66         { }             /* end of list */
  67 };
  68
  69 static struct usb_gadget_strings g_dnl_string_tab = {
  70         .language = 0x0409, /* en-us */
  71         .strings = g_dnl_string_defs,
  72 };
  73
  74 static struct usb_gadget_strings *g_dnl_composite_strings[] = {
  75         &g_dnl_string_tab,
  76         NULL,
  77 };
  78
  79 static int g_dnl_unbind(struct usb_composite_dev *cdev)
  80 {
  81         struct usb_gadget *gadget = cdev->gadget;
  82
  83         debug("%s: calling usb_gadget_disconnect for "
  84                         "controller '%s'\n", shortname, gadget->name);
  85         usb_gadget_disconnect(gadget);
  86
  87         return 0;
  88 }
  89
  90 static int g_dnl_do_config(struct usb_configuration *c)
  91 {
  92         const char *s = c->cdev->driver->name;
  93         int ret = -1;
  94
  95         debug("%s: configuration: 0x%p composite dev: 0x%p\n",
  96               __func__, c, c->cdev);
  97
  98         printf("GADGET DRIVER: %s\n", s);
  99         if (!strcmp(s, "usb_dnl_dfu"))
 100                 ret = dfu_add(c);
 101         else if (!strcmp(s, "usb_dnl_ums"))
 102                 ret = fsg_add(c);
 103
 104         return ret;
 105 }
 106
 107 static int g_dnl_config_register(struct usb_composite_dev *cdev)
 108 {
 109         static struct usb_configuration config = {
 110                 .label = "usb_dnload",
 111                 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 112                 .bConfigurationValue =  CONFIGURATION_NUMBER,
 113                 .iConfiguration =       STRING_USBDOWN,
 114
 115                 .bind = g_dnl_do_config,
 116         };
 117
 118         return usb_add_config(cdev, &config);
 119 }
 120
 121 __weak
 122 int g_dnl_bind_fixup(struct usb_device_descriptor *dev)
 123 {
 124         return 0;
 125 }
 126
 127 static int g_dnl_bind(struct usb_composite_dev *cdev)
 128 {
 129         struct usb_gadget *gadget = cdev->gadget;
 130         int id, ret;
 131         int gcnum;
 132
 133         debug("%s: gadget: 0x%p cdev: 0x%p\n", __func__, gadget, cdev);
 134
 135         id = usb_string_id(cdev);
 136
 137         if (id < 0)
 138                 return id;
 139         g_dnl_string_defs[0].id = id;
 140         device_desc.iManufacturer = id;
 141
 142         id = usb_string_id(cdev);
 143         if (id < 0)
 144                 return id;
 145
 146         g_dnl_string_defs[1].id = id;
 147         device_desc.iProduct = id;
 148
 149         g_dnl_bind_fixup(&device_desc);
 150         ret = g_dnl_config_register(cdev);
 151         if (ret)
 152                 goto error;
 153
 154         gcnum = usb_gadget_controller_number(gadget);
 155
 156         debug("gcnum: %d\n", gcnum);
 157         if (gcnum >= 0)
 158                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
 159         else {
 160                 debug("%s: controller '%s' not recognized\n",
 161                         shortname, gadget->name);
 162                 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
 163         }
 164
 165         debug("%s: calling usb_gadget_connect for "
 166                         "controller '%s'\n", shortname, gadget->name);
 167         usb_gadget_connect(gadget);
 168
 169         return 0;
 170
 171  error:
 172         g_dnl_unbind(cdev);
 173         return -ENOMEM;
 174 }
 175
 176 static struct usb_composite_driver g_dnl_driver = {
 177         .name = NULL,
 178         .dev = &device_desc,
 179         .strings = g_dnl_composite_strings,
 180
 181         .bind = g_dnl_bind,
 182         .unbind = g_dnl_unbind,
 183 };
 184
 185 int g_dnl_register(const char *type)
 186 {
 187         /* We only allow "dfu" atm, so 3 should be enough */
 188         static char name[sizeof(shortname) + 3];
 189         int ret;
 190
 191         if (!strcmp(type, "dfu")) {
 192                 strcpy(name, shortname);
 193                 strcat(name, type);
 194         } else if (!strcmp(type, "ums")) {
 195                 strcpy(name, shortname);
 196                 strcat(name, type);
 197         } else {
 198                 printf("%s: unknown command: %s\n", __func__, type);
 199                 return -EINVAL;
 200         }
 201
 202         g_dnl_driver.name = name;
 203
 204         debug("%s: g_dnl_driver.name: %s\n", __func__, g_dnl_driver.name);
 205         ret = usb_composite_register(&g_dnl_driver);
 206
 207         if (ret) {
 208                 printf("%s: failed!, error: %d\n", __func__, ret);
 209                 return ret;
 210         }
 211
 212         return 0;
 213 }
 214
 215 void g_dnl_unregister(void)
 216 {
 217         usb_composite_unregister(&g_dnl_driver);
 218 }