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/*
* cdc2.c -- CDC Composite driver, with ECM and ACM support
*
* Copyright (C) 2008 David Brownell
* Copyright (C) 2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/module.h>
#include "u_ether.h"
#include "u_serial.h"
#define DRIVER_DESC "CDC Composite Gadget"
#define DRIVER_VERSION "King Kamehameha Day 2008"
/*-------------------------------------------------------------------------*/
/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
/* Thanks to NetChip Technologies for donating this product ID.
* It's for devices with only this composite CDC configuration.
*/
#define CDC_VENDOR_NUM 0x0525 /* NetChip */
#define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
/*-------------------------------------------------------------------------*/
/*
* Kbuild is not very cooperative with respect to linking separately
* compiled library objects into one module. So for now we won't use
* separate compilation ... ensuring init/exit sections work to shrink
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#include "composite.c"
#include "u_serial.c"
#include "f_acm.c"
#include "f_ecm.c"
#include "u_ether.c"
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_COMM,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
/* .bMaxPacketSize0 = f(hardware) */
/* Vendor and product id can be overridden by module parameters. */
.idVendor = cpu_to_le16(CDC_VENDOR_NUM),
.idProduct = cpu_to_le16(CDC_PRODUCT_NUM),
/* .bcdDevice = f(hardware) */
/* .iManufacturer = DYNAMIC */
/* .iProduct = DYNAMIC */
/* NO SERIAL NUMBER */
.bNumConfigurations = 1,
};
static struct usb_otg_descriptor otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
/* REVISIT SRP-only hardware is possible, although
* it would not be called "OTG" ...
*/
.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
};
static const struct usb_descriptor_header *otg_desc[] = {
(struct usb_descriptor_header *) &otg_descriptor,
NULL,
};
/* string IDs are assigned dynamically */
#define STRING_MANUFACTURER_IDX 0
#define STRING_PRODUCT_IDX 1
static char manufacturer[50];
static struct usb_string strings_dev[] = {
[STRING_MANUFACTURER_IDX].s = manufacturer,
[STRING_PRODUCT_IDX].s = DRIVER_DESC,
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings_dev,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
static u8 hostaddr[ETH_ALEN];
/*-------------------------------------------------------------------------*/
/*
* We _always_ have both CDC ECM and CDC ACM functions.
*/
static int __init cdc_do_config(struct usb_configuration *c)
{
int status;
if (gadget_is_otg(c->cdev->gadget)) {
c->descriptors = otg_desc;
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
status = ecm_bind_config(c, hostaddr);
if (status < 0)
return status;
status = acm_bind_config(c, 0);
if (status < 0)
return status;
return 0;
}
static struct usb_configuration cdc_config_driver = {
.label = "CDC Composite (ECM + ACM)",
.bConfigurationValue = 1,
/* .iConfiguration = DYNAMIC */
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
};
/*-------------------------------------------------------------------------*/
static int __init cdc_bind(struct usb_composite_dev *cdev)
{
int gcnum;
struct usb_gadget *gadget = cdev->gadget;
int status;
if (!can_support_ecm(cdev->gadget)) {
dev_err(&gadget->dev, "controller '%s' not usable\n",
gadget->name);
return -EINVAL;
}
/* set up network link layer */
status = gether_setup(cdev->gadget, hostaddr);
if (status < 0)
return status;
/* set up serial link layer */
status = gserial_setup(cdev->gadget, 1);
if (status < 0)
goto fail0;
gcnum = usb_gadget_controller_number(gadget);
if (gcnum >= 0)
device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
else {
/* We assume that can_support_ecm() tells the truth;
* but if the controller isn't recognized at all then
* that assumption is a bit more likely to be wrong.
*/
WARNING(cdev, "controller '%s' not recognized; trying %s\n",
gadget->name,
cdc_config_driver.label);
device_desc.bcdDevice =
cpu_to_le16(0x0300 | 0x0099);
}
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
/* device descriptor strings: manufacturer, product */
snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
status = usb_string_id(cdev);
if (status < 0)
goto fail1;
strings_dev[STRING_MANUFACTURER_IDX].id = status;
device_desc.iManufacturer = status;
status = usb_string_id(cdev);
if (status < 0)
goto fail1;
strings_dev[STRING_PRODUCT_IDX].id = status;
device_desc.iProduct = status;
/* register our configuration */
status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
if (status < 0)
goto fail1;
dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
DRIVER_DESC);
return 0;
fail1:
gserial_cleanup();
fail0:
gether_cleanup();
return status;
}
static int __exit cdc_unbind(struct usb_composite_dev *cdev)
{
gserial_cleanup();
gether_cleanup();
return 0;
}
static __refdata struct usb_composite_driver cdc_driver = {
.name = "g_cdc",
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_HIGH,
.bind = cdc_bind,
.unbind = __exit_p(cdc_unbind),
};
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");
static int __init init(void)
{
return usb_composite_probe(&cdc_driver);
}
module_init(init);
static void __exit cleanup(void)
{
usb_composite_unregister(&cdc_driver);
}
module_exit(cleanup);
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