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 <common.h>
  11 #include <malloc.h>
  12
  13 #include <mmc.h>
  14 #include <part.h>
  15
  16 #include <g_dnl.h>
  17 #include <usb_mass_storage.h>
  18 #include <dfu.h>
  19
  20 #include "gadget_chips.h"
  21 #include "composite.c"
  22
  23 /*
  24  * One needs to define the following:
  25  * CONFIG_G_DNL_VENDOR_NUM
  26  * CONFIG_G_DNL_PRODUCT_NUM
  27  * CONFIG_G_DNL_MANUFACTURER
  28  * at e.g. ./include/configs/<board>.h
  29  */
  30
  31 #define STRING_MANUFACTURER 25
  32 #define STRING_PRODUCT 2
  33 /* Index of String Descriptor describing this configuration */
  34 #define STRING_USBDOWN 2
  35 /* Number of supported configurations */
  36 #define CONFIGURATION_NUMBER 1
  37
  38 #define DRIVER_VERSION          "usb_dnl 2.0"
  39
  40 static const char shortname[] = "usb_dnl_";
  41 static const char product[] = "USB download gadget";
  42 static const char manufacturer[] = CONFIG_G_DNL_MANUFACTURER;
  43
  44 static struct usb_device_descriptor device_desc = {
  45         .bLength = sizeof device_desc,
  46         .bDescriptorType = USB_DT_DEVICE,
  47
  48         .bcdUSB = __constant_cpu_to_le16(0x0200),
  49         .bDeviceClass = USB_CLASS_COMM,
  50         .bDeviceSubClass = 0x02, /*0x02:CDC-modem , 0x00:CDC-serial*/
  51
  52         .idVendor = __constant_cpu_to_le16(CONFIG_G_DNL_VENDOR_NUM),
  53         .idProduct = __constant_cpu_to_le16(CONFIG_G_DNL_PRODUCT_NUM),
  54         .iProduct = STRING_PRODUCT,
  55         .bNumConfigurations = 1,
  56 };
  57
  58 /*
  59  * static strings, in UTF-8
  60  * IDs for those strings are assigned dynamically at g_dnl_bind()
  61  */
  62 static struct usb_string g_dnl_string_defs[] = {
  63         {.s = manufacturer},
  64         {.s = product},
  65         { }             /* end of list */
  66 };
  67
  68 static struct usb_gadget_strings g_dnl_string_tab = {
  69         .language = 0x0409, /* en-us */
  70         .strings = g_dnl_string_defs,
  71 };
  72
  73 static struct usb_gadget_strings *g_dnl_composite_strings[] = {
  74         &g_dnl_string_tab,
  75         NULL,
  76 };
  77
  78 static int g_dnl_unbind(struct usb_composite_dev *cdev)
  79 {
  80         struct usb_gadget *gadget = cdev->gadget;
  81
  82         free(cdev->config);
  83         cdev->config = NULL;
  84         debug("%s: calling usb_gadget_disconnect for "
  85                         "controller '%s'\n", shortname, gadget->name);
  86         usb_gadget_disconnect(gadget);
  87
  88         return 0;
  89 }
  90
  91 static int g_dnl_do_config(struct usb_configuration *c)
  92 {
  93         const char *s = c->cdev->driver->name;
  94         int ret = -1;
  95
  96         debug("%s: configuration: 0x%p composite dev: 0x%p\n",
  97               __func__, c, c->cdev);
  98
  99         printf("GADGET DRIVER: %s\n", s);
 100         if (!strcmp(s, "usb_dnl_dfu"))
 101                 ret = dfu_add(c);
 102         else if (!strcmp(s, "usb_dnl_ums"))
 103                 ret = fsg_add(c);
 104
 105         return ret;
 106 }
 107
 108 static int g_dnl_config_register(struct usb_composite_dev *cdev)
 109 {
 110         struct usb_configuration *config;
 111         const char *name = "usb_dnload";
 112
 113         config = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*config));
 114         if (!config)
 115                 return -ENOMEM;
 116
 117         memset(config, 0, sizeof(*config));
 118
 119         config->label = name;
 120         config->bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER;
 121         config->bConfigurationValue = CONFIGURATION_NUMBER;
 122         config->iConfiguration = STRING_USBDOWN;
 123         config->bind = g_dnl_do_config;
 124
 125         return usb_add_config(cdev, config);
 126 }
 127
 128 __weak
 129 int g_dnl_bind_fixup(struct usb_device_descriptor *dev, const char *name)
 130 {
 131         return 0;
 132 }
 133
 134 static int g_dnl_bind(struct usb_composite_dev *cdev)
 135 {
 136         struct usb_gadget *gadget = cdev->gadget;
 137         int id, ret;
 138         int gcnum;
 139
 140         debug("%s: gadget: 0x%p cdev: 0x%p\n", __func__, gadget, cdev);
 141
 142         id = usb_string_id(cdev);
 143
 144         if (id < 0)
 145                 return id;
 146         g_dnl_string_defs[0].id = id;
 147         device_desc.iManufacturer = id;
 148
 149         id = usb_string_id(cdev);
 150         if (id < 0)
 151                 return id;
 152
 153         g_dnl_string_defs[1].id = id;
 154         device_desc.iProduct = id;
 155
 156         g_dnl_bind_fixup(&device_desc, cdev->driver->name);
 157         ret = g_dnl_config_register(cdev);
 158         if (ret)
 159                 goto error;
 160
 161         gcnum = usb_gadget_controller_number(gadget);
 162
 163         debug("gcnum: %d\n", gcnum);
 164         if (gcnum >= 0)
 165                 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
 166         else {
 167                 debug("%s: controller '%s' not recognized\n",
 168                         shortname, gadget->name);
 169                 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
 170         }
 171
 172         debug("%s: calling usb_gadget_connect for "
 173                         "controller '%s'\n", shortname, gadget->name);
 174         usb_gadget_connect(gadget);
 175
 176         return 0;
 177
 178  error:
 179         g_dnl_unbind(cdev);
 180         return -ENOMEM;
 181 }
 182
 183 static struct usb_composite_driver g_dnl_driver = {
 184         .name = NULL,
 185         .dev = &device_desc,
 186         .strings = g_dnl_composite_strings,
 187
 188         .bind = g_dnl_bind,
 189         .unbind = g_dnl_unbind,
 190 };
 191
 192 int g_dnl_register(const char *type)
 193 {
 194         /* We only allow "dfu" atm, so 3 should be enough */
 195         static char name[sizeof(shortname) + 3];
 196         int ret;
 197
 198         if (!strcmp(type, "dfu")) {
 199                 strcpy(name, shortname);
 200                 strcat(name, type);
 201         } else if (!strcmp(type, "ums")) {
 202                 strcpy(name, shortname);
 203                 strcat(name, type);
 204         } else {
 205                 printf("%s: unknown command: %s\n", __func__, type);
 206                 return -EINVAL;
 207         }
 208
 209         g_dnl_driver.name = name;
 210
 211         debug("%s: g_dnl_driver.name: %s\n", __func__, g_dnl_driver.name);
 212         ret = usb_composite_register(&g_dnl_driver);
 213
 214         if (ret) {
 215                 printf("%s: failed!, error: %d\n", __func__, ret);
 216                 return ret;
 217         }
 218
 219         return 0;
 220 }
 221
 222 void g_dnl_unregister(void)
 223 {
 224         usb_composite_unregister(&g_dnl_driver);
 225 }