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 #define STRING_USBDOWN 2
  35 #define CONFIG_USBDOWNLOADER 2
  36
  37 #define DRIVER_VERSION          "usb_dnl 2.0"
  38
  39 static const char shortname[] = "usb_dnl_";
  40 static const char product[] = "USB download gadget";
  41 static const char manufacturer[] = CONFIG_G_DNL_MANUFACTURER;
  42
  43 static struct usb_device_descriptor device_desc = {
  44         .bLength = sizeof device_desc,
  45         .bDescriptorType = USB_DT_DEVICE,
  46
  47         .bcdUSB = __constant_cpu_to_le16(0x0200),
  48         .bDeviceClass = USB_CLASS_COMM,
  49         .bDeviceSubClass = 0x02, /*0x02:CDC-modem , 0x00:CDC-serial*/
  50
  51         .idVendor = __constant_cpu_to_le16(CONFIG_G_DNL_VENDOR_NUM),
  52         .idProduct = __constant_cpu_to_le16(CONFIG_G_DNL_PRODUCT_NUM),
  53         .iProduct = STRING_PRODUCT,
  54         .bNumConfigurations = 1,
  55 };
  56
  57 /* static strings, in UTF-8 */
  58 static struct usb_string g_dnl_string_defs[] = {
  59         { 0, manufacturer, },
  60         { 1, product, },
  61         {  }            /* end of list */
  62 };
  63
  64 static struct usb_gadget_strings g_dnl_string_tab = {
  65         .language = 0x0409, /* en-us */
  66         .strings = g_dnl_string_defs,
  67 };
  68
  69 static struct usb_gadget_strings *g_dnl_composite_strings[] = {
  70         &g_dnl_string_tab,
  71         NULL,
  72 };
  73
  74 static int g_dnl_unbind(struct usb_composite_dev *cdev)
  75 {
  76         struct usb_gadget *gadget = cdev->gadget;
  77
  78         debug("%s: calling usb_gadget_disconnect for "
  79                         "controller '%s'\n", shortname, gadget->name);
  80         usb_gadget_disconnect(gadget);
  81
  82         return 0;
  83 }
  84
  85 static int g_dnl_do_config(struct usb_configuration *c)
  86 {
  87         const char *s = c->cdev->driver->name;
  88         int ret = -1;
  89
  90         debug("%s: configuration: 0x%p composite dev: 0x%p\n",
  91               __func__, c, c->cdev);
  92
  93         printf("GADGET DRIVER: %s\n", s);
  94         if (!strcmp(s, "usb_dnl_dfu"))
  95                 ret = dfu_add(c);
  96         else if (!strcmp(s, "usb_dnl_ums"))
  97                 ret = fsg_add(c);
  98
  99         return ret;
 100 }
 101
 102 static int g_dnl_config_register(struct usb_composite_dev *cdev)
 103 {
 104         static struct usb_configuration config = {
 105                 .label = "usb_dnload",
 106                 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 107                 .bConfigurationValue =  CONFIG_USBDOWNLOADER,
 108                 .iConfiguration =       STRING_USBDOWN,
 109
 110                 .bind = g_dnl_do_config,
 111         };
 112
 113         return usb_add_config(cdev, &config);
 114 }
 115
 116 __weak
 117 int g_dnl_bind_fixup(struct usb_device_descriptor *dev)
 118 {
 119         return 0;
 120 }
 121
 122 static int g_dnl_bind(struct usb_composite_dev *cdev)
 123 {
 124         struct usb_gadget *gadget = cdev->gadget;
 125         int id, ret;
 126         int gcnum;
 127
 128         debug("%s: gadget: 0x%p cdev: 0x%p\n", __func__, gadget, cdev);
 129
 130         id = usb_string_id(cdev);
 131
 132         if (id < 0)
 133                 return id;
 134         g_dnl_string_defs[0].id = id;
 135         device_desc.iManufacturer = id;
 136
 137         id = usb_string_id(cdev);
 138         if (id < 0)
 139                 return id;
 140
 141         g_dnl_string_defs[1].id = id;
 142         device_desc.iProduct = id;
 143
 144         g_dnl_bind_fixup(&device_desc);
 145         ret = g_dnl_config_register(cdev);
 146         if (ret)
 147                 goto error;
 148
 149         gcnum = usb_gadget_controller_number(gadget);
 150
 151         debug("gcnum: %d\n", gcnum);
 152         if (gcnum >= 0)
 153                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
 154         else {
 155                 debug("%s: controller '%s' not recognized\n",
 156                         shortname, gadget->name);
 157                 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
 158         }
 159
 160         debug("%s: calling usb_gadget_connect for "
 161                         "controller '%s'\n", shortname, gadget->name);
 162         usb_gadget_connect(gadget);
 163
 164         return 0;
 165
 166  error:
 167         g_dnl_unbind(cdev);
 168         return -ENOMEM;
 169 }
 170
 171 static struct usb_composite_driver g_dnl_driver = {
 172         .name = NULL,
 173         .dev = &device_desc,
 174         .strings = g_dnl_composite_strings,
 175
 176         .bind = g_dnl_bind,
 177         .unbind = g_dnl_unbind,
 178 };
 179
 180 int g_dnl_register(const char *type)
 181 {
 182         /* We only allow "dfu" atm, so 3 should be enough */
 183         static char name[sizeof(shortname) + 3];
 184         int ret;
 185
 186         if (!strcmp(type, "dfu")) {
 187                 strcpy(name, shortname);
 188                 strcat(name, type);
 189         } else if (!strcmp(type, "ums")) {
 190                 strcpy(name, shortname);
 191                 strcat(name, type);
 192         } else {
 193                 printf("%s: unknown command: %s\n", __func__, type);
 194                 return -EINVAL;
 195         }
 196
 197         g_dnl_driver.name = name;
 198
 199         debug("%s: g_dnl_driver.name: %s\n", __func__, g_dnl_driver.name);
 200         ret = usb_composite_register(&g_dnl_driver);
 201
 202         if (ret) {
 203                 printf("%s: failed!, error: %d\n", __func__, ret);
 204                 return ret;
 205         }
 206
 207         return 0;
 208 }
 209
 210 void g_dnl_unregister(void)
 211 {
 212         usb_composite_unregister(&g_dnl_driver);
 213 }