drivers/usb/gadget/legacy/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/module.h>
  15
  16 #include "u_ether.h"
  17 #include "u_serial.h"
  18 #include "u_ecm.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 USB_GADGET_COMPOSITE_OPTIONS();
  37
  38 USB_ETHERNET_MODULE_PARAMETERS();
  39
  40 /*-------------------------------------------------------------------------*/
  41
  42 static struct usb_device_descriptor device_desc = {
  43         .bLength =              sizeof device_desc,
  44         .bDescriptorType =      USB_DT_DEVICE,
  45
  46         .bcdUSB =               cpu_to_le16(0x0200),
  47
  48         .bDeviceClass =         USB_CLASS_COMM,
  49         .bDeviceSubClass =      0,
  50         .bDeviceProtocol =      0,
  51         /* .bMaxPacketSize0 = f(hardware) */
  52
  53         /* Vendor and product id can be overridden by module parameters.  */
  54         .idVendor =             cpu_to_le16(CDC_VENDOR_NUM),
  55         .idProduct =            cpu_to_le16(CDC_PRODUCT_NUM),
  56         /* .bcdDevice = f(hardware) */
  57         /* .iManufacturer = DYNAMIC */
  58         /* .iProduct = DYNAMIC */
  59         /* NO SERIAL NUMBER */
  60         .bNumConfigurations =   1,
  61 };
  62
  63 static struct usb_otg_descriptor otg_descriptor = {
  64         .bLength =              sizeof otg_descriptor,
  65         .bDescriptorType =      USB_DT_OTG,
  66
  67         /* REVISIT SRP-only hardware is possible, although
  68          * it would not be called "OTG" ...
  69          */
  70         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  71 };
  72
  73 static const struct usb_descriptor_header *otg_desc[] = {
  74         (struct usb_descriptor_header *) &otg_descriptor,
  75         NULL,
  76 };
  77
  78
  79 /* string IDs are assigned dynamically */
  80 static struct usb_string strings_dev[] = {
  81         [USB_GADGET_MANUFACTURER_IDX].s = "",
  82         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
  83         [USB_GADGET_SERIAL_IDX].s = "",
  84         {  } /* end of list */
  85 };
  86
  87 static struct usb_gadget_strings stringtab_dev = {
  88         .language       = 0x0409,       /* en-us */
  89         .strings        = strings_dev,
  90 };
  91
  92 static struct usb_gadget_strings *dev_strings[] = {
  93         &stringtab_dev,
  94         NULL,
  95 };
  96
  97 /*-------------------------------------------------------------------------*/
  98 static struct usb_function *f_acm;
  99 static struct usb_function_instance *fi_serial;
 100
 101 static struct usb_function *f_ecm;
 102 static struct usb_function_instance *fi_ecm;
 103
 104 /*
 105  * We _always_ have both CDC ECM and CDC ACM functions.
 106  */
 107 static int cdc_do_config(struct usb_configuration *c)
 108 {
 109         int     status;
 110
 111         if (gadget_is_otg(c->cdev->gadget)) {
 112                 c->descriptors = otg_desc;
 113                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 114         }
 115
 116         f_ecm = usb_get_function(fi_ecm);
 117         if (IS_ERR(f_ecm)) {
 118                 status = PTR_ERR(f_ecm);
 119                 goto err_get_ecm;
 120         }
 121
 122         status = usb_add_function(c, f_ecm);
 123         if (status)
 124                 goto err_add_ecm;
 125
 126         f_acm = usb_get_function(fi_serial);
 127         if (IS_ERR(f_acm)) {
 128                 status = PTR_ERR(f_acm);
 129                 goto err_get_acm;
 130         }
 131
 132         status = usb_add_function(c, f_acm);
 133         if (status)
 134                 goto err_add_acm;
 135         return 0;
 136
 137 err_add_acm:
 138         usb_put_function(f_acm);
 139 err_get_acm:
 140         usb_remove_function(c, f_ecm);
 141 err_add_ecm:
 142         usb_put_function(f_ecm);
 143 err_get_ecm:
 144         return status;
 145 }
 146
 147 static struct usb_configuration cdc_config_driver = {
 148         .label                  = "CDC Composite (ECM + ACM)",
 149         .bConfigurationValue    = 1,
 150         /* .iConfiguration = DYNAMIC */
 151         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 152 };
 153
 154 /*-------------------------------------------------------------------------*/
 155
 156 static int cdc_bind(struct usb_composite_dev *cdev)
 157 {
 158         struct usb_gadget       *gadget = cdev->gadget;
 159         struct f_ecm_opts       *ecm_opts;
 160         int                     status;
 161
 162         if (!can_support_ecm(cdev->gadget)) {
 163                 dev_err(&gadget->dev, "controller '%s' not usable\n",
 164                                 gadget->name);
 165                 return -EINVAL;
 166         }
 167
 168         fi_ecm = usb_get_function_instance("ecm");
 169         if (IS_ERR(fi_ecm))
 170                 return PTR_ERR(fi_ecm);
 171
 172         ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
 173
 174         gether_set_qmult(ecm_opts->net, qmult);
 175         if (!gether_set_host_addr(ecm_opts->net, host_addr))
 176                 pr_info("using host ethernet address: %s", host_addr);
 177         if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
 178                 pr_info("using self ethernet address: %s", dev_addr);
 179
 180         fi_serial = usb_get_function_instance("acm");
 181         if (IS_ERR(fi_serial)) {
 182                 status = PTR_ERR(fi_serial);
 183                 goto fail;
 184         }
 185
 186         /* Allocate string descriptor numbers ... note that string
 187          * contents can be overridden by the composite_dev glue.
 188          */
 189
 190         status = usb_string_ids_tab(cdev, strings_dev);
 191         if (status < 0)
 192                 goto fail1;
 193         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 194         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 195
 196         /* register our configuration */
 197         status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
 198         if (status < 0)
 199                 goto fail1;
 200
 201         usb_composite_overwrite_options(cdev, &coverwrite);
 202         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 203                         DRIVER_DESC);
 204
 205         return 0;
 206
 207 fail1:
 208         usb_put_function_instance(fi_serial);
 209 fail:
 210         usb_put_function_instance(fi_ecm);
 211         return status;
 212 }
 213
 214 static int cdc_unbind(struct usb_composite_dev *cdev)
 215 {
 216         usb_put_function(f_acm);
 217         usb_put_function_instance(fi_serial);
 218         if (!IS_ERR_OR_NULL(f_ecm))
 219                 usb_put_function(f_ecm);
 220         if (!IS_ERR_OR_NULL(fi_ecm))
 221                 usb_put_function_instance(fi_ecm);
 222         return 0;
 223 }
 224
 225 static struct usb_composite_driver cdc_driver = {
 226         .name           = "g_cdc",
 227         .dev            = &device_desc,
 228         .strings        = dev_strings,
 229         .max_speed      = USB_SPEED_HIGH,
 230         .bind           = cdc_bind,
 231         .unbind         = cdc_unbind,
 232 };
 233
 234 module_usb_composite_driver(cdc_driver);
 235
 236 MODULE_DESCRIPTION(DRIVER_DESC);
 237 MODULE_AUTHOR("David Brownell");
 238 MODULE_LICENSE("GPL");