[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / gadget / cdc2.c

/*
 * cdc2.c -- CDC Composite driver, with ECM and ACM support
 *
 * Copyright (C) 2008 David Brownell
 * Copyright (C) 2008 Nokia Corporation
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "u_ether.h"
#include "u_serial.h"


#define DRIVER_DESC		"CDC Composite Gadget"
#define DRIVER_VERSION		"King Kamehameha Day 2008"

/*-------------------------------------------------------------------------*/

/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */

/* Thanks to NetChip Technologies for donating this product ID.
 * It's for devices with only this composite CDC configuration.
 */
#define CDC_VENDOR_NUM		0x0525	/* NetChip */
#define CDC_PRODUCT_NUM		0xa4aa	/* CDC Composite: ECM + ACM */

/*-------------------------------------------------------------------------*/
USB_GADGET_COMPOSITE_OPTIONS();

/*
 * 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 "u_serial.c"
#include "f_acm.c"
#include "f_ecm.c"
#include "u_ether.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,
	/* .bMaxPacketSize0 = f(hardware) */

	/* Vendor and product id can be overridden by module parameters.  */
	.idVendor =		cpu_to_le16(CDC_VENDOR_NUM),
	.idProduct =		cpu_to_le16(CDC_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 */
static struct usb_string strings_dev[] = {
	[USB_GADGET_MANUFACTURER_IDX].s = "",
	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
	[USB_GADGET_SERIAL_IDX].s = "",
	{  } /* 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];

/*-------------------------------------------------------------------------*/

/*
 * We _always_ have both CDC ECM and CDC ACM functions.
 */
static int __init cdc_do_config(struct usb_configuration *c)
{
	int	status;

	if (gadget_is_otg(c->cdev->gadget)) {
		c->descriptors = otg_desc;
		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	status = ecm_bind_config(c, hostaddr);
	if (status < 0)
		return status;

	status = acm_bind_config(c, 0);
	if (status < 0)
		return status;

	return 0;
}

static struct usb_configuration cdc_config_driver = {
	.label			= "CDC Composite (ECM + ACM)",
	.bConfigurationValue	= 1,
	/* .iConfiguration = DYNAMIC */
	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
};

/*-------------------------------------------------------------------------*/

static int __init cdc_bind(struct usb_composite_dev *cdev)
{
	int			gcnum;
	struct usb_gadget	*gadget = cdev->gadget;
	int			status;

	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;

	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; trying %s\n",
				gadget->name,
				cdc_config_driver.label);
		device_desc.bcdDevice =
			cpu_to_le16(0x0300 | 0x0099);
	}

	/* Allocate string descriptor numbers ... note that string
	 * contents can be overridden by the composite_dev glue.
	 */

	status = usb_string_ids_tab(cdev, strings_dev);
	if (status < 0)
		goto fail1;
	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;

	/* register our configuration */
	status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
	if (status < 0)
		goto fail1;

	usb_composite_overwrite_options(cdev, &coverwrite);
	dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
			DRIVER_DESC);

	return 0;

fail1:
	gserial_cleanup();
fail0:
	gether_cleanup();
	return status;
}

static int __exit cdc_unbind(struct usb_composite_dev *cdev)
{
	gserial_cleanup();
	gether_cleanup();
	return 0;
}

static __refdata struct usb_composite_driver cdc_driver = {
	.name		= "g_cdc",
	.dev		= &device_desc,
	.strings	= dev_strings,
	.max_speed	= USB_SPEED_HIGH,
	.bind		= cdc_bind,
	.unbind		= __exit_p(cdc_unbind),
};

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");

static int __init init(void)
{
	return usb_composite_probe(&cdc_driver);
}
module_init(init);

static void __exit cleanup(void)
{
	usb_composite_unregister(&cdc_driver);
}
module_exit(cleanup);
Commit	Line	Data
19e20680 DB	1	/*
	2	* cdc2.c -- CDC Composite driver, with ECM and ACM support
	3	*
	4	* Copyright (C) 2008 David Brownell
	5	* Copyright (C) 2008 Nokia Corporation
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
19e20680 DB	11	*/
	12
	13	#include <linux/kernel.h>
6eb0de82	14	#include <linux/module.h>
19e20680 DB	15
	16	#include "u_ether.h"
	17	#include "u_serial.h"
	18
	19
	20	#define DRIVER_DESC "CDC Composite Gadget"
	21	#define DRIVER_VERSION "King Kamehameha Day 2008"
	22
	23	/-------------------------------------------------------------------------/
	24
	25	/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
	26	* Instead: allocate your own, using normal USB-IF procedures.
	27	*/
	28
	29	/* Thanks to NetChip Technologies for donating this product ID.
	30	* It's for devices with only this composite CDC configuration.
	31	*/
	32	#define CDC_VENDOR_NUM 0x0525 /* NetChip */
	33	#define CDC_PRODUCT_NUM 0xa4aa /* CDC Composite: ECM + ACM */
	34
	35	/-------------------------------------------------------------------------/
7d16e8d3	36	USB_GADGET_COMPOSITE_OPTIONS();
19e20680	37
8a1ce2c0 DB	38	/*
	39	* Kbuild is not very cooperative with respect to linking separately
	40	* compiled library objects into one module. So for now we won't use
	41	* separate compilation ... ensuring init/exit sections work to shrink
	42	* the runtime footprint, and giving us at least some parts of what
	43	* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
	44	*/
	45
	46	#include "composite.c"
8a1ce2c0 DB	47	#include "u_serial.c"
	48	#include "f_acm.c"
	49	#include "f_ecm.c"
	50	#include "u_ether.c"
	51
	52	/-------------------------------------------------------------------------/
	53
19e20680 DB	54	static struct usb_device_descriptor device_desc = {
	55	.bLength = sizeof device_desc,
	56	.bDescriptorType = USB_DT_DEVICE,
	57
551509d2	58	.bcdUSB = cpu_to_le16(0x0200),
19e20680 DB	59
	60	.bDeviceClass = USB_CLASS_COMM,
	61	.bDeviceSubClass = 0,
	62	.bDeviceProtocol = 0,
	63	/* .bMaxPacketSize0 = f(hardware) */
	64
	65	/* Vendor and product id can be overridden by module parameters. */
551509d2 HH	66	.idVendor = cpu_to_le16(CDC_VENDOR_NUM),
551509d2 HH	67	.idProduct = cpu_to_le16(CDC_PRODUCT_NUM),
19e20680 DB	68	/* .bcdDevice = f(hardware) */
	69	/* .iManufacturer = DYNAMIC */
	70	/* .iProduct = DYNAMIC */
	71	/* NO SERIAL NUMBER */
	72	.bNumConfigurations = 1,
	73	};
	74
	75	static struct usb_otg_descriptor otg_descriptor = {
	76	.bLength = sizeof otg_descriptor,
	77	.bDescriptorType = USB_DT_OTG,
	78
	79	/* REVISIT SRP-only hardware is possible, although
	80	* it would not be called "OTG" ...
	81	*/
	82	.bmAttributes = USB_OTG_SRP \| USB_OTG_HNP,
	83	};
	84
	85	static const struct usb_descriptor_header *otg_desc[] = {
	86	(struct usb_descriptor_header *) &otg_descriptor,
	87	NULL,
	88	};
	89
	90
	91	/* string IDs are assigned dynamically */
19e20680	92	static struct usb_string strings_dev[] = {
cc2683c3	93	[USB_GADGET_MANUFACTURER_IDX].s = "",
276e2e4f SAS	94	[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
276e2e4f SAS	95	[USB_GADGET_SERIAL_IDX].s = "",
19e20680 DB	96	{ } /* end of list */
	97	};
	98
	99	static struct usb_gadget_strings stringtab_dev = {
	100	.language = 0x0409, /* en-us */
	101	.strings = strings_dev,
	102	};
	103
	104	static struct usb_gadget_strings *dev_strings[] = {
	105	&stringtab_dev,
	106	NULL,
	107	};
	108
	109	static u8 hostaddr[ETH_ALEN];
	110
	111	/-------------------------------------------------------------------------/
	112
	113	/*
	114	* We _always_ have both CDC ECM and CDC ACM functions.
	115	*/
e12995ec	116	static int __init cdc_do_config(struct usb_configuration *c)
19e20680 DB	117	{
	118	int status;
	119
	120	if (gadget_is_otg(c->cdev->gadget)) {
	121	c->descriptors = otg_desc;
	122	c->bmAttributes \|= USB_CONFIG_ATT_WAKEUP;
	123	}
	124
	125	status = ecm_bind_config(c, hostaddr);
	126	if (status < 0)
	127	return status;
	128
	129	status = acm_bind_config(c, 0);
ac90e365	130	if (status < 0)
19e20680 DB	131	return status;
	132
	133	return 0;
	134	}
	135
	136	static struct usb_configuration cdc_config_driver = {
	137	.label = "CDC Composite (ECM + ACM)",
19e20680 DB	138	.bConfigurationValue = 1,
	139	/* .iConfiguration = DYNAMIC */
	140	.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
19e20680 DB	141	};
	142
	143	/-------------------------------------------------------------------------/
	144
e12995ec	145	static int __init cdc_bind(struct usb_composite_dev *cdev)
19e20680 DB	146	{
	147	int gcnum;
	148	struct usb_gadget *gadget = cdev->gadget;
	149	int status;
	150
	151	if (!can_support_ecm(cdev->gadget)) {
8a1ce2c0 DB	152	dev_err(&gadget->dev, "controller '%s' not usable\n",
8a1ce2c0 DB	153	gadget->name);
19e20680 DB	154	return -EINVAL;
	155	}
	156
	157	/* set up network link layer */
	158	status = gether_setup(cdev->gadget, hostaddr);
	159	if (status < 0)
	160	return status;
	161
	162	/* set up serial link layer */
	163	status = gserial_setup(cdev->gadget, 1);
	164	if (status < 0)
	165	goto fail0;
	166
	167	gcnum = usb_gadget_controller_number(gadget);
	168	if (gcnum >= 0)
	169	device_desc.bcdDevice = cpu_to_le16(0x0300 \| gcnum);
	170	else {
	171	/* We assume that can_support_ecm() tells the truth;
	172	* but if the controller isn't recognized at all then
	173	* that assumption is a bit more likely to be wrong.
	174	*/
b6c63937	175	WARNING(cdev, "controller '%s' not recognized; trying %s\n",
19e20680 DB	176	gadget->name,
	177	cdc_config_driver.label);
	178	device_desc.bcdDevice =
551509d2	179	cpu_to_le16(0x0300 \| 0x0099);
19e20680 DB	180	}
19e20680 DB	181
19e20680 DB	182	/* Allocate string descriptor numbers ... note that string
	183	* contents can be overridden by the composite_dev glue.
	184	*/
	185
e1f15ccb	186	status = usb_string_ids_tab(cdev, strings_dev);
19e20680 DB	187	if (status < 0)
19e20680 DB	188	goto fail1;
276e2e4f SAS	189	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
276e2e4f SAS	190	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
19e20680 DB	191
19e20680 DB	192	/* register our configuration */
c9bfff9c	193	status = usb_add_config(cdev, &cdc_config_driver, cdc_do_config);
19e20680 DB	194	if (status < 0)
	195	goto fail1;
	196
7d16e8d3	197	usb_composite_overwrite_options(cdev, &coverwrite);
8a1ce2c0 DB	198	dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
8a1ce2c0 DB	199	DRIVER_DESC);
19e20680 DB	200
	201	return 0;
	202
	203	fail1:
	204	gserial_cleanup();
	205	fail0:
	206	gether_cleanup();
	207	return status;
	208	}
	209
	210	static int __exit cdc_unbind(struct usb_composite_dev *cdev)
	211	{
	212	gserial_cleanup();
	213	gether_cleanup();
	214	return 0;
	215	}
	216
c2ec75c2	217	static __refdata struct usb_composite_driver cdc_driver = {
19e20680 DB	218	.name = "g_cdc",
	219	.dev = &device_desc,
	220	.strings = dev_strings,
35a0e0bf	221	.max_speed = USB_SPEED_HIGH,
03e42bd5	222	.bind = cdc_bind,
19e20680 DB	223	.unbind = __exit_p(cdc_unbind),
	224	};
	225
	226	MODULE_DESCRIPTION(DRIVER_DESC);
	227	MODULE_AUTHOR("David Brownell");
	228	MODULE_LICENSE("GPL");
	229
	230	static int __init init(void)
	231	{
03e42bd5	232	return usb_composite_probe(&cdc_driver);
19e20680 DB	233	}
	234	module_init(init);
	235
	236	static void __exit cleanup(void)
	237	{
	238	usb_composite_unregister(&cdc_driver);
	239	}
	240	module_exit(cleanup);