USB: g_multi: Multifunction Composite Gadget added

The Multifunction Composite Gadget has two configurations
consisting of Ethernet (RNDIS in first and CDC Ethernet in
second configuration), CDC Serial and File-backed Storage
functions.

When connected to a Windows host, the first configuration
is chosen thus gadget provides RNDIS Ethernet, serial and
mass storage whereas when connected to Linux host, second
configuration is chosen thus providing CDC Ethernet,
serial and mass storage.

Which configurations are built can be configured via
KConfig options.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/Kconfig

@@ -812,6 +812,48 @@ config USB_CDC_COMPOSITE
 	  Say "y" to link the driver statically, or "m" to build a
 	  dynamically linked module.
 
+config USB_G_MULTI
+	tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
+	help
+	  The Multifunction Composite Gadget provides Ethernet (RNDIS
+	  and/or CDC Ethernet), mass storage and ACM serial link
+	  interfaces.
+
+	  You will be asked too choose which of the two configurations are
+	  to be available in the gadget.  At least one configuration must
+	  be choosen to make gadget usable.  Selecting more then one
+	  configuration will prevent Windows from automatically detecting
+	  the gadget as a composite gadget an INF file will be needed to
+	  use the gadget.
+
+	  Say "y" to link the driver statically, or "m" to build a
+	  dynamically linked module called "g_multi".
+
+config USB_G_MULTI_RNDIS
+	bool "RNDIS + CDC Serial + Storage configuration"
+	depends on USB_G_MULTI
+	default y
+	help
+	  This option enables a configuration with RNDIS, CDC Serial and
+	  Mass Storage functions available in the Multifunction Composite
+	  Gadget.  This is configuration dedicated for Windows since RNDIS
+	  is Microsfot's protocol.
+
+	  If unsure, say "y".
+
+config USB_G_MULTI_CDC
+	bool "CDC Ethernet + CDC Serial + Storage configuration"
+	depends on USB_G_MULTI
+	default n
+	help
+	  This option enables a configuration with CDC Ethernet (ECM), CDC
+	  Serial and Mass Storage functions available in the Multifunction
+	  Composite Gadget.  This is configuration dedicated for Windows
+	  since RNDIS is Microsfot's protocol.
+
+	  If unsure, say "y".
+
+
 # put drivers that need isochronous transfer support (for audio
 # or video class gadget drivers), or specific hardware, here.
 

drivers/usb/gadget/Makefile

@@ -42,6 +42,7 @@ g_file_storage-objs		:= file_storage.o
 g_mass_storage-objs		:= mass_storage.o
 g_printer-objs			:= printer.o
 g_cdc-objs			:= cdc2.o
+g_multi-objs			:= multi.o
 
 obj-$(CONFIG_USB_ZERO)		+= g_zero.o
 obj-$(CONFIG_USB_AUDIO)		+= g_audio.o
@@ -53,4 +54,5 @@ obj-$(CONFIG_USB_G_SERIAL)	+= g_serial.o
 obj-$(CONFIG_USB_G_PRINTER)	+= g_printer.o
 obj-$(CONFIG_USB_MIDI_GADGET)	+= g_midi.o
 obj-$(CONFIG_USB_CDC_COMPOSITE) += g_cdc.o
+obj-$(CONFIG_USB_G_MULTI)	+= g_multi.o
 

drivers/usb/gadget/multi.c

@@ -0,0 +1,355 @@
+/*
+ * multi.c -- Multifunction Composite driver
+ *
+ * Copyright (C) 2008 David Brownell
+ * Copyright (C) 2008 Nokia Corporation
+ * Copyright (C) 2009 Samsung Electronics
+ * Author: Michal Nazarewicz (m.nazarewicz@samsung.com)
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+
+
+#if defined CONFIG_USB_G_MULTI_RNDIS
+#  define CONFIG_USB_ETH_RNDIS y
+#endif
+
+
+#define DRIVER_DESC		"Multifunction Composite Gadget"
+#define DRIVER_VERSION		"2009/07/21"
+
+/*-------------------------------------------------------------------------*/
+
+#define MULTI_VENDOR_NUM	0x0525	/* XXX NetChip */
+#define MULTI_PRODUCT_NUM	0xa4ab	/* XXX */
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * 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 "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+
+#include "u_serial.c"
+#include "f_acm.c"
+
+#include "f_ecm.c"
+#include "f_subset.c"
+#ifdef CONFIG_USB_ETH_RNDIS
+#  include "f_rndis.c"
+#  include "rndis.c"
+#endif
+#include "u_ether.c"
+
+#undef DBG     /* u_ether.c has broken idea about macros */
+#undef VDBG    /* so clean up after it */
+#undef ERROR
+#undef INFO
+#include "f_mass_storage.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, */
+	.bDeviceClass =		0xEF,
+	.bDeviceSubClass =	2,
+	.bDeviceProtocol =	1,
+	/* .bMaxPacketSize0 = f(hardware) */
+
+	/* Vendor and product id can be overridden by module parameters.  */
+	.idVendor =		cpu_to_le16(MULTI_VENDOR_NUM),
+	.idProduct =		cpu_to_le16(MULTI_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];
+
+
+
+/****************************** Configurations ******************************/
+
+static struct fsg_module_parameters mod_data = {
+	.stall = 1
+};
+FSG_MODULE_PARAMETERS(/* no prefix */, mod_data);
+
+static struct fsg_common *fsg_common;
+
+
+#ifdef CONFIG_USB_ETH_RNDIS
+
+static int __init rndis_do_config(struct usb_configuration *c)
+{
+	int ret;
+
+	if (gadget_is_otg(c->cdev->gadget)) {
+		c->descriptors = otg_desc;
+		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+	}
+
+	ret = rndis_bind_config(c, hostaddr);
+	if (ret < 0)
+		return ret;
+
+	ret = acm_bind_config(c, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = fsg_add(c->cdev, c, fsg_common);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct usb_configuration rndis_config_driver = {
+	.label			= "Multifunction Composite (RNDIS + MS + ACM)",
+	.bind			= rndis_do_config,
+	.bConfigurationValue	= 2,
+	/* .iConfiguration = DYNAMIC */
+	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
+};
+
+#endif
+
+#ifdef CONFIG_USB_G_MULTI_CDC
+
+static int __init cdc_do_config(struct usb_configuration *c)
+{
+	int ret;
+
+	if (gadget_is_otg(c->cdev->gadget)) {
+		c->descriptors = otg_desc;
+		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+	}
+
+	ret = ecm_bind_config(c, hostaddr);
+	if (ret < 0)
+		return ret;
+
+	ret = acm_bind_config(c, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = fsg_add(c->cdev, c, fsg_common);
+	if (ret < 0)
+		return ret;
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct usb_configuration cdc_config_driver = {
+	.label			= "Multifunction Composite (CDC + MS + ACM)",
+	.bind			= cdc_do_config,
+	.bConfigurationValue	= 1,
+	/* .iConfiguration = DYNAMIC */
+	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
+};
+
+#endif
+
+
+
+/****************************** Gadget Bind ******************************/
+
+
+static int __init multi_bind(struct usb_composite_dev *cdev)
+{
+	struct usb_gadget *gadget = cdev->gadget;
+	int status, gcnum;
+
+	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;
+
+	/* set up mass storage function */
+	fsg_common = fsg_common_from_params(0, cdev, &mod_data);
+	if (IS_ERR(fsg_common)) {
+		status = PTR_ERR(fsg_common);
+		goto fail1;
+	}
+
+
+	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\n",
+		        gadget->name);
+		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 fail2;
+	strings_dev[STRING_MANUFACTURER_IDX].id = status;
+	device_desc.iManufacturer = status;
+
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto fail2;
+	strings_dev[STRING_PRODUCT_IDX].id = status;
+	device_desc.iProduct = status;
+
+#ifdef CONFIG_USB_ETH_RNDIS
+	/* register our first configuration */
+	status = usb_add_config(cdev, &rndis_config_driver);
+	if (status < 0)
+		goto fail2;
+#endif
+
+#ifdef CONFIG_USB_G_MULTI_CDC
+	/* register our second configuration */
+	status = usb_add_config(cdev, &cdc_config_driver);
+	if (status < 0)
+		goto fail2;
+#endif
+
+	dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
+	fsg_common_put(fsg_common);
+	return 0;
+
+fail2:
+	fsg_common_put(fsg_common);
+fail1:
+	gserial_cleanup();
+fail0:
+	gether_cleanup();
+	return status;
+}
+
+static int __exit multi_unbind(struct usb_composite_dev *cdev)
+{
+	gserial_cleanup();
+	gether_cleanup();
+	return 0;
+}
+
+
+/****************************** Some noise ******************************/
+
+
+static struct usb_composite_driver multi_driver = {
+	.name		= "g_multi",
+	.dev		= &device_desc,
+	.strings	= dev_strings,
+	.bind		= multi_bind,
+	.unbind		= __exit_p(multi_unbind),
+};
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Michal Nazarewicz");
+MODULE_LICENSE("GPL");
+
+static int __init g_multi_init(void)
+{
+	return usb_composite_register(&multi_driver);
+}
+module_init(g_multi_init);
+
+static void __exit g_multi_cleanup(void)
+{
+	usb_composite_unregister(&multi_driver);
+}
+module_exit(g_multi_cleanup);