drivers/usb/gadget/cdc2.c

   1 /*
   2  * cdc2.c -- CDC Composite driver, with ECM and ACM support
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/utsname.h>
  15 #include <linux/module.h>
  16
  17 #include "u_ether.h"
  18 #include "u_serial.h"
  19
  20
  21 #define DRIVER_DESC             "CDC Composite Gadget"
  22 #define DRIVER_VERSION          "King Kamehameha Day 2008"
  23
  24 /*-------------------------------------------------------------------------*/
  25
  26 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  27  * Instead:  allocate your own, using normal USB-IF procedures.
  28  */
  29
  30 /* Thanks to NetChip Technologies for donating this product ID.
  31  * It's for devices with only this composite CDC configuration.
  32  */
  33 #define CDC_VENDOR_NUM          0x0525  /* NetChip */
  34 #define CDC_PRODUCT_NUM         0xa4aa  /* CDC Composite: ECM + ACM */
  35
  36 /*-------------------------------------------------------------------------*/
  37
  38 /*
  39  * Kbuild is not very cooperative with respect to linking separately
  40  * compiled library objects into one module.  So for now we won't use
  41  * separate compilation ... ensuring init/exit sections work to shrink
  42  * the runtime footprint, and giving us at least some parts of what
  43  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  44  */
  45
  46 #include "composite.c"
  47 #include "usbstring.c"
  48 #include "config.c"
  49 #include "epautoconf.c"
  50 #include "u_serial.c"
  51 #include "f_acm.c"
  52 #include "f_ecm.c"
  53 #include "u_ether.c"
  54
  55 /*-------------------------------------------------------------------------*/
  56
  57 static struct usb_device_descriptor device_desc = {
  58         .bLength =              sizeof device_desc,
  59         .bDescriptorType =      USB_DT_DEVICE,
  60
  61         .bcdUSB =               cpu_to_le16(0x0200),
  62
  63         .bDeviceClass =         USB_CLASS_COMM,
  64         .bDeviceSubClass =      0,
  65         .bDeviceProtocol =      0,
  66         /* .bMaxPacketSize0 = f(hardware) */
  67
  68         /* Vendor and product id can be overridden by module parameters.  */
  69         .idVendor =             cpu_to_le16(CDC_VENDOR_NUM),
  70         .idProduct =            cpu_to_le16(CDC_PRODUCT_NUM),
  71         /* .bcdDevice = f(hardware) */
  72         /* .iManufacturer = DYNAMIC */
  73         /* .iProduct = DYNAMIC */
  74         /* NO SERIAL NUMBER */
  75         .bNumConfigurations =   1,
  76 };
  77
  78 static struct usb_otg_descriptor otg_descriptor = {
  79         .bLength =              sizeof otg_descriptor,
  80         .bDescriptorType =      USB_DT_OTG,
  81
  82         /* REVISIT SRP-only hardware is possible, although
  83          * it would not be called "OTG" ...
  84          */
  85         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  86 };
  87
  88 static const struct usb_descriptor_header *otg_desc[] = {
  89         (struct usb_descriptor_header *) &otg_descriptor,
  90         NULL,
  91 };
  92
  93
  94 /* string IDs are assigned dynamically */
  95
  96 #define STRING_MANUFACTURER_IDX         0
  97 #define STRING_PRODUCT_IDX              1
  98
  99 static char manufacturer[50];
 100
 101 static struct usb_string strings_dev[] = {
 102         [STRING_MANUFACTURER_IDX].s = manufacturer,
 103         [STRING_PRODUCT_IDX].s = DRIVER_DESC,
 104         {  } /* end of list */
 105 };
 106
 107 static struct usb_gadget_strings stringtab_dev = {
 108         .language       = 0x0409,       /* en-us */
 109         .strings        = strings_dev,
 110 };
 111
 112 static struct usb_gadget_strings *dev_strings[] = {
 113         &stringtab_dev,
 114         NULL,
 115 };
 116
 117 static u8 hostaddr[ETH_ALEN];
 118
 119 /*-------------------------------------------------------------------------*/
 120
 121 /*
 122  * We _always_ have both CDC ECM and CDC ACM functions.
 123  */
 124 static int __init cdc_do_config(struct usb_configuration *c)
 125 {
 126         int     status;
 127
 128         if (gadget_is_otg(c->cdev->gadget)) {
 129                 c->descriptors = otg_desc;
 130                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 131         }
 132
 133         status = ecm_bind_config(c, hostaddr);
 134         if (status < 0)
 135                 return status;
 136
 137         status = acm_bind_config(c, 0);
 138         if (status < 0)
 139                 return status;
 140
 141         return 0;
 142 }
 143
 144 static struct usb_configuration cdc_config_driver = {
 145         .label                  = "CDC Composite (ECM + ACM)",
 146         .bConfigurationValue    = 1,
 147         /* .iConfiguration = DYNAMIC */
 148         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 149 };
 150
 151 /*-------------------------------------------------------------------------*/
 152
 153 static int __init cdc_bind(struct usb_composite_dev *cdev)
 154 {
 155         int                     gcnum;
 156         struct usb_gadget       *gadget = cdev->gadget;
 157         int                     status;
 158
 159         if (!can_support_ecm(cdev->gadget)) {
 160                 dev_err(&gadget->dev, "controller '%s' not usable\n",
 161                                 gadget->name);
 162                 return -EINVAL;
 163         }
 164
 165         /* set up network link layer */
 166         status = gether_setup(cdev->gadget, hostaddr);
 167         if (status < 0)
 168                 return status;
 169
 170         /* set up serial link layer */
 171         status = gserial_setup(cdev->gadget, 1);
 172         if (status < 0)
 173                 goto fail0;
 174
 175         gcnum = usb_gadget_controller_number(gadget);
 176         if (gcnum >= 0)
 177                 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
 178         else {
 179                 /* We assume that can_support_ecm() tells the truth;
 180                  * but if the controller isn't recognized at all then
 181                  * that assumption is a bit more likely to be wrong.
 182                  */
 183                 WARNING(cdev, "controller '%s' not recognized; trying %s\n",
 184                                 gadget->name,
 185                                 cdc_config_driver.label);
 186                 device_desc.bcdDevice =
 187                         cpu_to_le16(0x0300 | 0x0099);
 188         }
 189
 190
 191         /* Allocate string descriptor numbers ... note that string
 192          * contents can be overridden by the composite_dev glue.
 193          */
 194
 195         /* device descriptor strings: manufacturer, product */
 196         snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 197                 init_utsname()->sysname, init_utsname()->release,
 198                 gadget->name);
 199         status = usb_string_id(cdev);
 200         if (status < 0)
 201                 goto fail1;
 202         strings_dev[STRING_MANUFACTURER_IDX].id = status;
 203         device_desc.iManufacturer = status;
 204
 205         status = usb_string_id(cdev);
 206         if (status < 0)
 207                 goto fail1;
 208         strings_dev[STRING_PRODUCT_IDX].id = status;
 209         device_desc.iProduct = status;
 210
 211         /* register our configuration */
 212         status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
 213         if (status < 0)
 214                 goto fail1;
 215
 216         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 217                         DRIVER_DESC);
 218
 219         return 0;
 220
 221 fail1:
 222         gserial_cleanup();
 223 fail0:
 224         gether_cleanup();
 225         return status;
 226 }
 227
 228 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
 229 {
 230         gserial_cleanup();
 231         gether_cleanup();
 232         return 0;
 233 }
 234
 235 static struct usb_composite_driver cdc_driver = {
 236         .name           = "g_cdc",
 237         .dev            = &device_desc,
 238         .strings        = dev_strings,
 239         .max_speed      = USB_SPEED_HIGH,
 240         .unbind         = __exit_p(cdc_unbind),
 241 };
 242
 243 MODULE_DESCRIPTION(DRIVER_DESC);
 244 MODULE_AUTHOR("David Brownell");
 245 MODULE_LICENSE("GPL");
 246
 247 static int __init init(void)
 248 {
 249         return usb_composite_probe(&cdc_driver, cdc_bind);
 250 }
 251 module_init(init);
 252
 253 static void __exit cleanup(void)
 254 {
 255         usb_composite_unregister(&cdc_driver);
 256 }
 257 module_exit(cleanup);