266 lines
6.4 KiB
C
266 lines
6.4 KiB
C
/*
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* cdc2.c -- CDC Composite driver, with ECM and ACM support
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*
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* Copyright (C) 2008 David Brownell
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* Copyright (C) 2008 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "u_ether.h"
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#include "u_serial.h"
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#include "u_ecm.h"
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#define DRIVER_DESC "CDC Composite Gadget"
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#define DRIVER_VERSION "King Kamehameha Day 2008"
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/*-------------------------------------------------------------------------*/
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/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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/* Thanks to NetChip Technologies for donating this product ID.
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* It's for devices with only this composite CDC configuration.
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*/
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#define CDC_VENDOR_NUM 0x0525 /* NetChip */
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#define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
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USB_GADGET_COMPOSITE_OPTIONS();
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USB_ETHERNET_MODULE_PARAMETERS();
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_COMM,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id can be overridden by module parameters. */
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.idVendor = cpu_to_le16(CDC_VENDOR_NUM),
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.idProduct = cpu_to_le16(CDC_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/* string IDs are assigned dynamically */
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static struct usb_function *f_acm;
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static struct usb_function_instance *fi_serial;
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static struct usb_function *f_ecm;
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static struct usb_function_instance *fi_ecm;
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/*
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* We _always_ have both CDC ECM and CDC ACM functions.
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*/
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static int __init cdc_do_config(struct usb_configuration *c)
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{
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int status;
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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fi_ecm = usb_get_function_instance("ecm");
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if (IS_ERR(fi_ecm)) {
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status = PTR_ERR(fi_ecm);
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goto err_func_ecm;
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}
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f_ecm = usb_get_function(fi_ecm);
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if (IS_ERR(f_ecm)) {
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status = PTR_ERR(f_ecm);
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goto err_get_ecm;
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}
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status = usb_add_function(c, f_ecm);
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if (status)
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goto err_add_ecm;
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fi_serial = usb_get_function_instance("acm");
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if (IS_ERR(fi_serial)) {
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status = PTR_ERR(fi_serial);
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goto err_get_acm;
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}
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f_acm = usb_get_function(fi_serial);
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if (IS_ERR(f_acm)) {
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status = PTR_ERR(f_acm);
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goto err_func_acm;
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}
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status = usb_add_function(c, f_acm);
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if (status)
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goto err_add_acm;
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return 0;
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err_add_acm:
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usb_put_function(f_acm);
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err_func_acm:
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usb_put_function_instance(fi_serial);
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err_get_acm:
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usb_remove_function(c, f_ecm);
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err_add_ecm:
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usb_put_function(f_ecm);
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err_get_ecm:
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usb_put_function_instance(fi_ecm);
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err_func_ecm:
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return status;
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}
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static struct usb_configuration cdc_config_driver = {
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.label = "CDC Composite (ECM + ACM)",
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/*-------------------------------------------------------------------------*/
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static int __init cdc_bind(struct usb_composite_dev *cdev)
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{
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struct usb_gadget *gadget = cdev->gadget;
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struct f_ecm_opts *ecm_opts;
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int status;
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if (!can_support_ecm(cdev->gadget)) {
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dev_err(&gadget->dev, "controller '%s' not usable\n",
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gadget->name);
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return -EINVAL;
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}
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fi_ecm = usb_get_function_instance("ecm");
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if (IS_ERR(fi_ecm))
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return PTR_ERR(fi_ecm);
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ecm_opts = container_of(fi_ecm, struct f_ecm_opts, func_inst);
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gether_set_qmult(ecm_opts->net, qmult);
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if (!gether_set_host_addr(ecm_opts->net, host_addr))
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pr_info("using host ethernet address: %s", host_addr);
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if (!gether_set_dev_addr(ecm_opts->net, dev_addr))
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pr_info("using self ethernet address: %s", dev_addr);
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fi_serial = usb_get_function_instance("acm");
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if (IS_ERR(fi_serial)) {
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status = PTR_ERR(fi_serial);
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goto fail;
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}
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/* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail1;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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/* register our configuration */
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status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
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if (status < 0)
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goto fail1;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
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DRIVER_DESC);
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return 0;
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fail1:
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usb_put_function_instance(fi_serial);
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fail:
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usb_put_function_instance(fi_ecm);
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return status;
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}
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static int __exit cdc_unbind(struct usb_composite_dev *cdev)
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{
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usb_put_function(f_acm);
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usb_put_function_instance(fi_serial);
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if (!IS_ERR_OR_NULL(f_ecm))
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usb_put_function(f_ecm);
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if (!IS_ERR_OR_NULL(fi_ecm))
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usb_put_function_instance(fi_ecm);
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return 0;
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}
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static __refdata struct usb_composite_driver cdc_driver = {
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.name = "g_cdc",
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_HIGH,
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.bind = cdc_bind,
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.unbind = __exit_p(cdc_unbind),
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};
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("David Brownell");
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MODULE_LICENSE("GPL");
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static int __init init(void)
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{
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return usb_composite_probe(&cdc_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&cdc_driver);
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}
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module_exit(cleanup);
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