276e2e4f1f
The index in usb_string array is defined by the gadget. The gadget can choose which index entry it assigns for the serial number and which the product name. The gadget has just to ensure that the descriptor contains the proper string id which is assigned by composite. If the composite layer knows the index of the "default" information which will be overwritten by module parameters, it can be used later to overwrite it. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
231 lines
6 KiB
C
231 lines
6 KiB
C
/*
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* ncm.c -- NCM gadget driver
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*
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* Copyright (C) 2010 Nokia Corporation
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* Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
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*
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* The driver borrows from ether.c which is:
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*
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* Copyright (C) 2003-2005,2008 David Brownell
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* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
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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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/* #define DEBUG */
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include "u_ether.h"
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#define DRIVER_DESC "NCM Gadget"
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "composite.c"
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#include "f_ncm.c"
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#include "u_ether.c"
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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 CDC Ethernet configurations.
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*/
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#define CDC_VENDOR_NUM 0x0525 /* NetChip */
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#define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */
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/*-------------------------------------------------------------------------*/
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USB_GADGET_COMPOSITE_OPTIONS();
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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 defaults change according to what configs
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* we support. (As does bNumConfigurations.) These values can
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* also be overridden by module parameters.
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*/
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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 char manufacturer[50];
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
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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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static u8 hostaddr[ETH_ALEN];
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/*-------------------------------------------------------------------------*/
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static int __init ncm_do_config(struct usb_configuration *c)
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{
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/* FIXME alloc iConfiguration string, set it in c->strings */
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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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return ncm_bind_config(c, hostaddr);
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}
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static struct usb_configuration ncm_config_driver = {
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/* .label = f(hardware) */
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.label = "CDC Ethernet (NCM)",
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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 gncm_bind(struct usb_composite_dev *cdev)
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{
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int gcnum;
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struct usb_gadget *gadget = cdev->gadget;
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int status;
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/* set up network link layer */
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status = gether_setup(cdev->gadget, hostaddr);
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if (status < 0)
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return status;
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gcnum = usb_gadget_controller_number(gadget);
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if (gcnum >= 0)
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device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
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else {
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/* We assume that can_support_ecm() tells the truth;
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* but if the controller isn't recognized at all then
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* that assumption is a bit more likely to be wrong.
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*/
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dev_warn(&gadget->dev,
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"controller '%s' not recognized; trying %s\n",
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gadget->name,
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ncm_config_driver.label);
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device_desc.bcdDevice =
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cpu_to_le16(0x0300 | 0x0099);
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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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/* device descriptor strings: manufacturer, product */
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snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
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init_utsname()->sysname, init_utsname()->release,
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gadget->name);
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail;
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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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status = usb_add_config(cdev, &ncm_config_driver,
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ncm_do_config);
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if (status < 0)
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goto fail;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, "%s\n", DRIVER_DESC);
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return 0;
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fail:
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gether_cleanup();
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return status;
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}
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static int __exit gncm_unbind(struct usb_composite_dev *cdev)
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{
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gether_cleanup();
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return 0;
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}
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static __refdata struct usb_composite_driver ncm_driver = {
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.name = "g_ncm",
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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 = gncm_bind,
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.unbind = __exit_p(gncm_unbind),
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};
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Yauheni Kaliuta");
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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(&ncm_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(&ncm_driver);
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}
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module_exit(cleanup);
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