USB: gadget: introduce g_nokia gadget driver

g_nokia is the gadget driver implementing
WMCDC Wireless Handset Control Model for the N900
device.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/Kconfig

@@ -812,6 +812,16 @@ config USB_CDC_COMPOSITE
 	  Say "y" to link the driver statically, or "m" to build a
 	  dynamically linked module.
 
+config USB_G_NOKIA
+	tristate "Nokia composite gadget"
+	depends on PHONET
+	help
+	  The Nokia composite gadget provides support for acm, obex
+	  and phonet in only one composite gadget driver.
+
+	  It's only really useful for N900 hardware. If you're building
+	  a kernel for N900, say Y or M here. If unsure, say N.
+
 config USB_G_MULTI
 	tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
 	depends on BLOCK && NET

drivers/usb/gadget/Makefile

@@ -43,6 +43,7 @@ g_mass_storage-objs		:= mass_storage.o
 g_printer-objs			:= printer.o
 g_cdc-objs			:= cdc2.o
 g_multi-objs			:= multi.o
+g_nokia-objs			:= nokia.o
 
 obj-$(CONFIG_USB_ZERO)		+= g_zero.o
 obj-$(CONFIG_USB_AUDIO)		+= g_audio.o
@@ -55,4 +56,5 @@ 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
+obj-$(CONFIG_USB_G_NOKIA)	+= g_nokia.o
 

drivers/usb/gadget/nokia.c

+/*
+ * nokia.c -- Nokia Composite Gadget Driver
+ *
+ * Copyright (C) 2008-2010 Nokia Corporation
+ * Contact: Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * This gadget driver borrows from serial.c which is:
+ *
+ * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
+ * Copyright (C) 2008 by David Brownell
+ * Copyright (C) 2008 by Nokia Corporation
+ *
+ * This software is distributed under the terms of the GNU General
+ * Public License ("GPL") as published by the Free Software Foundation,
+ * version 2 of that License.
+ */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+#include <linux/device.h>
+
+#include "u_serial.h"
+#include "u_ether.h"
+#include "u_phonet.h"
+#include "gadget_chips.h"
+
+/* Defines */
+
+#define NOKIA_VERSION_NUM		0x0211
+#define NOKIA_LONG_NAME			"N900 (PC-Suite Mode)"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * 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_obex.c"
+#include "f_serial.c"
+#include "f_phonet.c"
+#include "u_ether.c"
+
+/*-------------------------------------------------------------------------*/
+
+#define NOKIA_VENDOR_ID			0x0421	/* Nokia */
+#define NOKIA_PRODUCT_ID		0x01c8	/* Nokia Gadget */
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX		0
+#define STRING_PRODUCT_IDX		1
+#define STRING_DESCRIPTION_IDX		2
+
+static char manufacturer_nokia[] = "Nokia";
+static const char product_nokia[] = NOKIA_LONG_NAME;
+static const char description_nokia[] = "PC-Suite Configuration";
+
+static struct usb_string strings_dev[] = {
+	[STRING_MANUFACTURER_IDX].s = manufacturer_nokia,
+	[STRING_PRODUCT_IDX].s = NOKIA_LONG_NAME,
+	[STRING_DESCRIPTION_IDX].s = description_nokia,
+	{  } /* 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 struct usb_device_descriptor device_desc = {
+	.bLength		= USB_DT_DEVICE_SIZE,
+	.bDescriptorType	= USB_DT_DEVICE,
+	.bcdUSB			= __constant_cpu_to_le16(0x0200),
+	.bDeviceClass		= USB_CLASS_COMM,
+	.idVendor		= __constant_cpu_to_le16(NOKIA_VENDOR_ID),
+	.idProduct		= __constant_cpu_to_le16(NOKIA_PRODUCT_ID),
+	/* .iManufacturer = DYNAMIC */
+	/* .iProduct = DYNAMIC */
+	.bNumConfigurations =	1,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* Module */
+MODULE_DESCRIPTION("Nokia composite gadget driver for N900");
+MODULE_AUTHOR("Felipe Balbi");
+MODULE_LICENSE("GPL");
+
+/*-------------------------------------------------------------------------*/
+
+static u8 hostaddr[ETH_ALEN];
+
+static int __init nokia_bind_config(struct usb_configuration *c)
+{
+	int status = 0;
+
+	status = phonet_bind_config(c);
+	if (status)
+		printk(KERN_DEBUG "could not bind phonet config\n");
+
+	status = obex_bind_config(c, 0);
+	if (status)
+		printk(KERN_DEBUG "could not bind obex config %d\n", 0);
+
+	status = obex_bind_config(c, 1);
+	if (status)
+		printk(KERN_DEBUG "could not bind obex config %d\n", 0);
+
+	status = acm_bind_config(c, 2);
+	if (status)
+		printk(KERN_DEBUG "could not bind acm config\n");
+
+	status = ecm_bind_config(c, hostaddr);
+	if (status)
+		printk(KERN_DEBUG "could not bind ecm config\n");
+
+	return status;
+}
+
+static struct usb_configuration nokia_config_500ma_driver = {
+	.label		= "Bus Powered",
+	.bind		= nokia_bind_config,
+	.bConfigurationValue = 1,
+	/* .iConfiguration = DYNAMIC */
+	.bmAttributes	= USB_CONFIG_ATT_ONE,
+	.bMaxPower	= 250, /* 500mA */
+};
+
+static struct usb_configuration nokia_config_100ma_driver = {
+	.label		= "Self Powered",
+	.bind		= nokia_bind_config,
+	.bConfigurationValue = 2,
+	/* .iConfiguration = DYNAMIC */
+	.bmAttributes	= USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
+	.bMaxPower	= 50, /* 100 mA */
+};
+
+static int __init nokia_bind(struct usb_composite_dev *cdev)
+{
+	int			gcnum;
+	struct usb_gadget	*gadget = cdev->gadget;
+	int			status;
+
+	status = gphonet_setup(cdev->gadget);
+	if (status < 0)
+		goto err_phonet;
+
+	status = gserial_setup(cdev->gadget, 3);
+	if (status < 0)
+		goto err_serial;
+
+	status = gether_setup(cdev->gadget, hostaddr);
+	if (status < 0)
+		goto err_ether;
+
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto err_usb;
+	strings_dev[STRING_MANUFACTURER_IDX].id = status;
+
+	device_desc.iManufacturer = status;
+
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto err_usb;
+	strings_dev[STRING_PRODUCT_IDX].id = status;
+
+	device_desc.iProduct = status;
+
+	/* config description */
+	status = usb_string_id(cdev);
+	if (status < 0)
+		goto err_usb;
+	strings_dev[STRING_DESCRIPTION_IDX].id = status;
+
+	nokia_config_500ma_driver.iConfiguration = status;
+	nokia_config_100ma_driver.iConfiguration = status;
+
+	/* set up other descriptors */
+	gcnum = usb_gadget_controller_number(gadget);
+	if (gcnum >= 0)
+		device_desc.bcdDevice = cpu_to_le16(NOKIA_VERSION_NUM);
+	else {
+		/* this should only work with hw that supports altsettings
+		 * and several endpoints, anything else, panic.
+		 */
+		pr_err("nokia_bind: controller '%s' not recognized\n",
+			gadget->name);
+		goto err_usb;
+	}
+
+	/* finaly register the configuration */
+	status = usb_add_config(cdev, &nokia_config_500ma_driver);
+	if (status < 0)
+		goto err_usb;
+
+	status = usb_add_config(cdev, &nokia_config_100ma_driver);
+	if (status < 0)
+		goto err_usb;
+
+	dev_info(&gadget->dev, "%s\n", NOKIA_LONG_NAME);
+
+	return 0;
+
+err_usb:
+	gether_cleanup();
+err_ether:
+	gserial_cleanup();
+err_serial:
+	gphonet_cleanup();
+err_phonet:
+	return status;
+}
+
+static int __exit nokia_unbind(struct usb_composite_dev *cdev)
+{
+	gphonet_cleanup();
+	gserial_cleanup();
+	gether_cleanup();
+
+	return 0;
+}
+
+static struct usb_composite_driver nokia_driver = {
+	.name		= "g_nokia",
+	.dev		= &device_desc,
+	.strings	= dev_strings,
+	.bind		= nokia_bind,
+	.unbind		= __exit_p(nokia_unbind),
+};
+
+static int __init nokia_init(void)
+{
+	return usb_composite_register(&nokia_driver);
+}
+module_init(nokia_init);
+
+static void __exit nokia_cleanup(void)
+{
+	usb_composite_unregister(&nokia_driver);
+}
+module_exit(nokia_cleanup);
+