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 /* static strings, in UTF-8 */
  60 static struct usb_string g_dnl_string_defs[] = {
  61         { 0, manufacturer, },
  62         { 1, product, },
  63         {  }            /* end of list */
  64 };
  65
  66 static struct usb_gadget_strings g_dnl_string_tab = {
  67         .language = 0x0409, /* en-us */
  68         .strings = g_dnl_string_defs,
  69 };
  70
  71 static struct usb_gadget_strings *g_dnl_composite_strings[] = {
  72         &g_dnl_string_tab,
  73         NULL,
  74 };
  75
  76 static int g_dnl_unbind(struct usb_composite_dev *cdev)
  77 {
  78         struct usb_gadget *gadget = cdev->gadget;
  79
  80         debug("%s: calling usb_gadget_disconnect for "
  81                         "controller '%s'\n", shortname, gadget->name);
  82         usb_gadget_disconnect(gadget);
  83
  84         return 0;
  85 }
  86
  87 static int g_dnl_do_config(struct usb_configuration *c)
  88 {
  89         const char *s = c->cdev->driver->name;
  90         int ret = -1;
  91
  92         debug("%s: configuration: 0x%p composite dev: 0x%p\n",
  93               __func__, c, c->cdev);
  94
  95         printf("GADGET DRIVER: %s\n", s);
  96         if (!strcmp(s, "usb_dnl_dfu"))
  97                 ret = dfu_add(c);
  98         else if (!strcmp(s, "usb_dnl_ums"))
  99                 ret = fsg_add(c);
 100
 101         return ret;
 102 }
 103
 104 static int g_dnl_config_register(struct usb_composite_dev *cdev)
 105 {
 106         static struct usb_configuration config = {
 107                 .label = "usb_dnload",
 108                 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
 109                 .bConfigurationValue =  CONFIGURATION_NUMBER,
 110                 .iConfiguration =       STRING_USBDOWN,
 111
 112                 .bind = g_dnl_do_config,
 113         };
 114
 115         return usb_add_config(cdev, &config);
 116 }
 117
 118 __weak
 119 int g_dnl_bind_fixup(struct usb_device_descriptor *dev)
 120 {
 121         return 0;
 122 }
 123
 124 static int g_dnl_bind(struct usb_composite_dev *cdev)
 125 {
 126         struct usb_gadget *gadget = cdev->gadget;
 127         int id, ret;
 128         int gcnum;
 129
 130         debug("%s: gadget: 0x%p cdev: 0x%p\n", __func__, gadget, cdev);
 131
 132         id = usb_string_id(cdev);
 133
 134         if (id < 0)
 135                 return id;
 136         g_dnl_string_defs[0].id = id;
 137         device_desc.iManufacturer = id;
 138
 139         id = usb_string_id(cdev);
 140         if (id < 0)
 141                 return id;
 142
 143         g_dnl_string_defs[1].id = id;
 144         device_desc.iProduct = id;
 145
 146         g_dnl_bind_fixup(&device_desc);
 147         ret = g_dnl_config_register(cdev);
 148         if (ret)
 149                 goto error;
 150
 151         gcnum = usb_gadget_controller_number(gadget);
 152
 153         debug("gcnum: %d\n", gcnum);
 154         if (gcnum >= 0)
 155                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
 156         else {
 157                 debug("%s: controller '%s' not recognized\n",
 158                         shortname, gadget->name);
 159                 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
 160         }
 161
 162         debug("%s: calling usb_gadget_connect for "
 163                         "controller '%s'\n", shortname, gadget->name);
 164         usb_gadget_connect(gadget);
 165
 166         return 0;
 167
 168  error:
 169         g_dnl_unbind(cdev);
 170         return -ENOMEM;
 171 }
 172
 173 static struct usb_composite_driver g_dnl_driver = {
 174         .name = NULL,
 175         .dev = &device_desc,
 176         .strings = g_dnl_composite_strings,
 177
 178         .bind = g_dnl_bind,
 179         .unbind = g_dnl_unbind,
 180 };
 181
 182 int g_dnl_register(const char *type)
 183 {
 184         /* We only allow "dfu" atm, so 3 should be enough */
 185         static char name[sizeof(shortname) + 3];
 186         int ret;
 187
 188         if (!strcmp(type, "dfu")) {
 189                 strcpy(name, shortname);
 190                 strcat(name, type);
 191         } else if (!strcmp(type, "ums")) {
 192                 strcpy(name, shortname);
 193                 strcat(name, type);
 194         } else {
 195                 printf("%s: unknown command: %s\n", __func__, type);
 196                 return -EINVAL;
 197         }
 198
 199         g_dnl_driver.name = name;
 200
 201         debug("%s: g_dnl_driver.name: %s\n", __func__, g_dnl_driver.name);
 202         ret = usb_composite_register(&g_dnl_driver);
 203
 204         if (ret) {
 205                 printf("%s: failed!, error: %d\n", __func__, ret);
 206                 return ret;
 207         }
 208
 209         return 0;
 210 }
 211
 212 void g_dnl_unregister(void)
 213 {
 214         usb_composite_unregister(&g_dnl_driver);
 215 }