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  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/utsname.h>
  24
  25 #include "u_ether.h"
  26 #include "u_serial.h"
  27
  28
  29 #define DRIVER_DESC             "CDC Composite Gadget"
  30 #define DRIVER_VERSION          "King Kamehameha Day 2008"
  31
  32 /*-------------------------------------------------------------------------*/
  33
  34 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  35  * Instead:  allocate your own, using normal USB-IF procedures.
  36  */
  37
  38 /* Thanks to NetChip Technologies for donating this product ID.
  39  * It's for devices with only this composite CDC configuration.
  40  */
  41 #define CDC_VENDOR_NUM          0x0525  /* NetChip */
  42 #define CDC_PRODUCT_NUM         0xa4aa  /* CDC Composite: ECM + ACM */
  43
  44 /*-------------------------------------------------------------------------*/
  45
  46 /*
  47  * Kbuild is not very cooperative with respect to linking separately
  48  * compiled library objects into one module.  So for now we won't use
  49  * separate compilation ... ensuring init/exit sections work to shrink
  50  * the runtime footprint, and giving us at least some parts of what
  51  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  52  */
  53
  54 #include "composite.c"
  55 #include "usbstring.c"
  56 #include "config.c"
  57 #include "epautoconf.c"
  58 #include "u_serial.c"
  59 #include "f_acm.c"
  60 #include "f_ecm.c"
  61 #include "u_ether.c"
  62
  63 /*-------------------------------------------------------------------------*/
  64
  65 static struct usb_device_descriptor device_desc = {
  66         .bLength =              sizeof device_desc,
  67         .bDescriptorType =      USB_DT_DEVICE,
  68
  69         .bcdUSB =               cpu_to_le16(0x0200),
  70
  71         .bDeviceClass =         USB_CLASS_COMM,
  72         .bDeviceSubClass =      0,
  73         .bDeviceProtocol =      0,
  74         /* .bMaxPacketSize0 = f(hardware) */
  75
  76         /* Vendor and product id can be overridden by module parameters.  */
  77         .idVendor =             cpu_to_le16(CDC_VENDOR_NUM),
  78         .idProduct =            cpu_to_le16(CDC_PRODUCT_NUM),
  79         /* .bcdDevice = f(hardware) */
  80         /* .iManufacturer = DYNAMIC */
  81         /* .iProduct = DYNAMIC */
  82         /* NO SERIAL NUMBER */
  83         .bNumConfigurations =   1,
  84 };
  85
  86 static struct usb_otg_descriptor otg_descriptor = {
  87         .bLength =              sizeof otg_descriptor,
  88         .bDescriptorType =      USB_DT_OTG,
  89
  90         /* REVISIT SRP-only hardware is possible, although
  91          * it would not be called "OTG" ...
  92          */
  93         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  94 };
  95
  96 static const struct usb_descriptor_header *otg_desc[] = {
  97         (struct usb_descriptor_header *) &otg_descriptor,
  98         NULL,
  99 };
 100
 101
 102 /* string IDs are assigned dynamically */
 103
 104 #define STRING_MANUFACTURER_IDX         0
 105 #define STRING_PRODUCT_IDX              1
 106
 107 static char manufacturer[50];
 108
 109 static struct usb_string strings_dev[] = {
 110         [STRING_MANUFACTURER_IDX].s = manufacturer,
 111         [STRING_PRODUCT_IDX].s = DRIVER_DESC,
 112         {  } /* end of list */
 113 };
 114
 115 static struct usb_gadget_strings stringtab_dev = {
 116         .language       = 0x0409,       /* en-us */
 117         .strings        = strings_dev,
 118 };
 119
 120 static struct usb_gadget_strings *dev_strings[] = {
 121         &stringtab_dev,
 122         NULL,
 123 };
 124
 125 static u8 hostaddr[ETH_ALEN];
 126
 127 /*-------------------------------------------------------------------------*/
 128
 129 /*
 130  * We _always_ have both CDC ECM and CDC ACM functions.
 131  */
 132 static int __init cdc_do_config(struct usb_configuration *c)
 133 {
 134         int     status;
 135
 136         if (gadget_is_otg(c->cdev->gadget)) {
 137                 c->descriptors = otg_desc;
 138                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 139         }
 140
 141         status = ecm_bind_config(c, hostaddr);
 142         if (status < 0)
 143                 return status;
 144
 145         status = acm_bind_config(c, 0);
 146         if (status < 0)
 147                 return status;
 148
 149         return 0;
 150 }
 151
 152 static struct usb_configuration cdc_config_driver = {
 153         .label                  = "CDC Composite (ECM + ACM)",
 154         .bConfigurationValue    = 1,
 155         /* .iConfiguration = DYNAMIC */
 156         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 157 };
 158
 159 /*-------------------------------------------------------------------------*/
 160
 161 static int __init cdc_bind(struct usb_composite_dev *cdev)
 162 {
 163         int                     gcnum;
 164         struct usb_gadget       *gadget = cdev->gadget;
 165         int                     status;
 166
 167         if (!can_support_ecm(cdev->gadget)) {
 168                 dev_err(&gadget->dev, "controller '%s' not usable\n",
 169                                 gadget->name);
 170                 return -EINVAL;
 171         }
 172
 173         /* set up network link layer */
 174         status = gether_setup(cdev->gadget, hostaddr);
 175         if (status < 0)
 176                 return status;
 177
 178         /* set up serial link layer */
 179         status = gserial_setup(cdev->gadget, 1);
 180         if (status < 0)
 181                 goto fail0;
 182
 183         gcnum = usb_gadget_controller_number(gadget);
 184         if (gcnum >= 0)
 185                 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
 186         else {
 187                 /* We assume that can_support_ecm() tells the truth;
 188                  * but if the controller isn't recognized at all then
 189                  * that assumption is a bit more likely to be wrong.
 190                  */
 191                 WARNING(cdev, "controller '%s' not recognized; trying %s\n",
 192                                 gadget->name,
 193                                 cdc_config_driver.label);
 194                 device_desc.bcdDevice =
 195                         cpu_to_le16(0x0300 | 0x0099);
 196         }
 197
 198
 199         /* Allocate string descriptor numbers ... note that string
 200          * contents can be overridden by the composite_dev glue.
 201          */
 202
 203         /* device descriptor strings: manufacturer, product */
 204         snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 205                 init_utsname()->sysname, init_utsname()->release,
 206                 gadget->name);
 207         status = usb_string_id(cdev);
 208         if (status < 0)
 209                 goto fail1;
 210         strings_dev[STRING_MANUFACTURER_IDX].id = status;
 211         device_desc.iManufacturer = status;
 212
 213         status = usb_string_id(cdev);
 214         if (status < 0)
 215                 goto fail1;
 216         strings_dev[STRING_PRODUCT_IDX].id = status;
 217         device_desc.iProduct = status;
 218
 219         /* register our configuration */
 220         status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
 221         if (status < 0)
 222                 goto fail1;
 223
 224         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 225                         DRIVER_DESC);
 226
 227         return 0;
 228
 229 fail1:
 230         gserial_cleanup();
 231 fail0:
 232         gether_cleanup();
 233         return status;
 234 }
 235
 236 static int __exit cdc_unbind(struct usb_composite_dev *cdev)
 237 {
 238         gserial_cleanup();
 239         gether_cleanup();
 240         return 0;
 241 }
 242
 243 static struct usb_composite_driver cdc_driver = {
 244         .name           = "g_cdc",
 245         .dev            = &device_desc,
 246         .strings        = dev_strings,
 247         .unbind         = __exit_p(cdc_unbind),
 248 };
 249
 250 MODULE_DESCRIPTION(DRIVER_DESC);
 251 MODULE_AUTHOR("David Brownell");
 252 MODULE_LICENSE("GPL");
 253
 254 static int __init init(void)
 255 {
 256         return usb_composite_probe(&cdc_driver, cdc_bind);
 257 }
 258 module_init(init);
 259
 260 static void __exit cleanup(void)
 261 {
 262         usb_composite_unregister(&cdc_driver);
 263 }
 264 module_exit(cleanup);