usb: gadget: g_ncm added
This patches makes possible to use composite framework and f_ncm NCM function driver to build a standalone NCM gadget device. Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@nokia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Yauheni Kaliuta
Greg Kroah-Hartman
parent
9f6ce4240a
commit
6c34d28882
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@ -741,6 +741,19 @@ config USB_ETH_EEM
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If you say "y" here, the Ethernet gadget driver will use the EEM
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protocol rather than ECM. If unsure, say "n".
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config USB_G_NCM
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tristate "Network Control Model (NCM) support"
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depends on NET
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select CRC32
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help
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This driver implements USB CDC NCM subclass standard. NCM is
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an advanced protocol for Ethernet encapsulation, allows grouping
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of several ethernet frames into one USB transfer and diffferent
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alignment possibilities.
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Say "y" to link the driver statically, or "m" to build a
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dynamically linked module called "g_ncm".
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config USB_GADGETFS
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tristate "Gadget Filesystem (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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@ -47,6 +47,7 @@ g_hid-y := hid.o
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g_dbgp-y := dbgp.o
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g_nokia-y := nokia.o
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g_webcam-y := webcam.o
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g_ncm-y := ncm.o
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obj-$(CONFIG_USB_ZERO) += g_zero.o
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obj-$(CONFIG_USB_AUDIO) += g_audio.o
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@ -64,3 +65,4 @@ obj-$(CONFIG_USB_G_DBGP) += g_dbgp.o
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obj-$(CONFIG_USB_G_MULTI) += g_multi.o
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obj-$(CONFIG_USB_G_NOKIA) += g_nokia.o
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obj-$(CONFIG_USB_G_WEBCAM) += g_webcam.o
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obj-$(CONFIG_USB_G_NCM) += g_ncm.o
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@ -0,0 +1,248 @@
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/*
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 "usbstring.c"
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#include "config.c"
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#include "epautoconf.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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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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#define STRING_MANUFACTURER_IDX 0
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#define STRING_PRODUCT_IDX 1
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static char manufacturer[50];
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static struct usb_string strings_dev[] = {
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[STRING_MANUFACTURER_IDX].s = manufacturer,
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[STRING_PRODUCT_IDX].s = DRIVER_DESC,
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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_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_MANUFACTURER_IDX].id = status;
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device_desc.iManufacturer = status;
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status = usb_string_id(cdev);
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if (status < 0)
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goto fail;
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strings_dev[STRING_PRODUCT_IDX].id = status;
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device_desc.iProduct = status;
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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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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 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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.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, gncm_bind);
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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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