drivers/usb/gadget/f_fastboot.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2008 - 2009
  * Windriver, <www.windriver.com>
  * Tom Rix <Tom.Rix@windriver.com>
  *
  * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
  *
  * Copyright 2014 Linaro, Ltd.
  * Rob Herring <robh@kernel.org>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 #include <config.h>
 #include <common.h>
 #include <errno.h>
 #include <malloc.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/composite.h>
 #include <linux/compiler.h>
 #include <version.h>
 #include <g_dnl.h>
 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 #include <fb_mmc.h>
 #endif

 #define FASTBOOT_VERSION		"0.4"

 #define FASTBOOT_INTERFACE_CLASS	0xff
 #define FASTBOOT_INTERFACE_SUB_CLASS	0x42
 #define FASTBOOT_INTERFACE_PROTOCOL	0x03

 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)

 /* The 64 defined bytes plus \0 */
 #define RESPONSE_LEN	(64 + 1)

 #define EP_BUFFER_SIZE			4096

 struct f_fastboot {
 	struct usb_function usb_function;

 	/* IN/OUT EP's and corresponding requests */
 	struct usb_ep *in_ep, *out_ep;
 	struct usb_request *in_req, *out_req;
 };

 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
 {
 	return container_of(f, struct f_fastboot, usb_function);
 }

 static struct f_fastboot *fastboot_func;
 static unsigned int download_size;
 static unsigned int download_bytes;
 static bool is_high_speed;

 static struct usb_endpoint_descriptor fs_ep_in = {
 	.bLength            = USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType    = USB_DT_ENDPOINT,
 	.bEndpointAddress   = USB_DIR_IN,
 	.bmAttributes       = USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize     = TX_ENDPOINT_MAXIMUM_PACKET_SIZE,
 	.bInterval          = 0x00,
 };

 static struct usb_endpoint_descriptor fs_ep_out = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 	.bEndpointAddress	= USB_DIR_OUT,
 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1,
 	.bInterval		= 0x00,
 };

 static struct usb_endpoint_descriptor hs_ep_out = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 	.bEndpointAddress	= USB_DIR_OUT,
 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0,
 	.bInterval		= 0x00,
 };

 static struct usb_interface_descriptor interface_desc = {
 	.bLength		= USB_DT_INTERFACE_SIZE,
 	.bDescriptorType	= USB_DT_INTERFACE,
 	.bInterfaceNumber	= 0x00,
 	.bAlternateSetting	= 0x00,
 	.bNumEndpoints		= 0x02,
 	.bInterfaceClass	= FASTBOOT_INTERFACE_CLASS,
 	.bInterfaceSubClass	= FASTBOOT_INTERFACE_SUB_CLASS,
 	.bInterfaceProtocol	= FASTBOOT_INTERFACE_PROTOCOL,
 };

 static struct usb_descriptor_header *fb_runtime_descs[] = {
 	(struct usb_descriptor_header *)&interface_desc,
 	(struct usb_descriptor_header *)&fs_ep_in,
 	(struct usb_descriptor_header *)&hs_ep_out,
 	NULL,
 };

 /*
  * static strings, in UTF-8
  */
 static const char fastboot_name[] = "Android Fastboot";

 static struct usb_string fastboot_string_defs[] = {
 	[0].s = fastboot_name,
 	{  }			/* end of list */
 };

 static struct usb_gadget_strings stringtab_fastboot = {
 	.language	= 0x0409,	/* en-us */
 	.strings	= fastboot_string_defs,
 };

 static struct usb_gadget_strings *fastboot_strings[] = {
 	&stringtab_fastboot,
 	NULL,
 };

 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
 static int strcmp_l1(const char *s1, const char *s2);

 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	int status = req->status;
 	if (!status)
 		return;
 	printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
 }

 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
 {
 	int id;
 	struct usb_gadget *gadget = c->cdev->gadget;
 	struct f_fastboot *f_fb = func_to_fastboot(f);
 	const char *s;

 	/* DYNAMIC interface numbers assignments */
 	id = usb_interface_id(c, f);
 	if (id < 0)
 		return id;
 	interface_desc.bInterfaceNumber = id;

 	id = usb_string_id(c->cdev);
 	if (id < 0)
 		return id;
 	fastboot_string_defs[0].id = id;
 	interface_desc.iInterface = id;

 	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
 	if (!f_fb->in_ep)
 		return -ENODEV;
 	f_fb->in_ep->driver_data = c->cdev;

 	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
 	if (!f_fb->out_ep)
 		return -ENODEV;
 	f_fb->out_ep->driver_data = c->cdev;

 	hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;

 	s = getenv("serial#");
 	if (s)
 		g_dnl_set_serialnumber((char *)s);

 	return 0;
 }

 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
 {
 	memset(fastboot_func, 0, sizeof(*fastboot_func));
 }

 static void fastboot_disable(struct usb_function *f)
 {
 	struct f_fastboot *f_fb = func_to_fastboot(f);

 	usb_ep_disable(f_fb->out_ep);
 	usb_ep_disable(f_fb->in_ep);

 	if (f_fb->out_req) {
 		free(f_fb->out_req->buf);
 		usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
 		f_fb->out_req = NULL;
 	}
 	if (f_fb->in_req) {
 		free(f_fb->in_req->buf);
 		usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
 		f_fb->in_req = NULL;
 	}
 }

 static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
 {
 	struct usb_request *req;

 	req = usb_ep_alloc_request(ep, 0);
 	if (!req)
 		return NULL;

 	req->length = EP_BUFFER_SIZE;
 	req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
 	if (!req->buf) {
 		usb_ep_free_request(ep, req);
 		return NULL;
 	}

 	memset(req->buf, 0, req->length);
 	return req;
 }

 static int fastboot_set_alt(struct usb_function *f,
 			    unsigned interface, unsigned alt)
 {
 	int ret;
 	struct usb_composite_dev *cdev = f->config->cdev;
 	struct usb_gadget *gadget = cdev->gadget;
 	struct f_fastboot *f_fb = func_to_fastboot(f);

 	debug("%s: func: %s intf: %d alt: %d\n",
 	      __func__, f->name, interface, alt);

 	/* make sure we don't enable the ep twice */
 	if (gadget->speed == USB_SPEED_HIGH) {
 		ret = usb_ep_enable(f_fb->out_ep, &hs_ep_out);
 		is_high_speed = true;
 	} else {
 		ret = usb_ep_enable(f_fb->out_ep, &fs_ep_out);
 		is_high_speed = false;
 	}
 	if (ret) {
 		puts("failed to enable out ep\n");
 		return ret;
 	}

 	f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
 	if (!f_fb->out_req) {
 		puts("failed to alloc out req\n");
 		ret = -EINVAL;
 		goto err;
 	}
 	f_fb->out_req->complete = rx_handler_command;

 	ret = usb_ep_enable(f_fb->in_ep, &fs_ep_in);
 	if (ret) {
 		puts("failed to enable in ep\n");
 		goto err;
 	}

 	f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
 	if (!f_fb->in_req) {
 		puts("failed alloc req in\n");
 		ret = -EINVAL;
 		goto err;
 	}
 	f_fb->in_req->complete = fastboot_complete;

 	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
 	if (ret)
 		goto err;

 	return 0;
 err:
 	fastboot_disable(f);
 	return ret;
 }

 static int fastboot_add(struct usb_configuration *c)
 {
 	struct f_fastboot *f_fb = fastboot_func;
 	int status;

 	debug("%s: cdev: 0x%p\n", __func__, c->cdev);

 	if (!f_fb) {
 		f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
 		if (!f_fb)
 			return -ENOMEM;

 		fastboot_func = f_fb;
 		memset(f_fb, 0, sizeof(*f_fb));
 	}

 	f_fb->usb_function.name = "f_fastboot";
 	f_fb->usb_function.hs_descriptors = fb_runtime_descs;
 	f_fb->usb_function.bind = fastboot_bind;
 	f_fb->usb_function.unbind = fastboot_unbind;
 	f_fb->usb_function.set_alt = fastboot_set_alt;
 	f_fb->usb_function.disable = fastboot_disable;
 	f_fb->usb_function.strings = fastboot_strings;

 	status = usb_add_function(c, &f_fb->usb_function);
 	if (status) {
 		free(f_fb);
 		fastboot_func = f_fb;
 	}

 	return status;
 }
 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);

 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
 {
 	struct usb_request *in_req = fastboot_func->in_req;
 	int ret;

 	memcpy(in_req->buf, buffer, buffer_size);
 	in_req->length = buffer_size;
 	ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
 	if (ret)
 		printf("Error %d on queue\n", ret);
 	return 0;
 }

 static int fastboot_tx_write_str(const char *buffer)
 {
 	return fastboot_tx_write(buffer, strlen(buffer));
 }

 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
 {
 	do_reset(NULL, 0, 0, NULL);
 }

 int __weak fb_set_reboot_flag(void)
 {
 	return -ENOSYS;
 }

 static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 	if (!strcmp_l1("reboot-bootloader", cmd)) {
 		if (fb_set_reboot_flag()) {
 			fastboot_tx_write_str("FAILCannot set reboot flag");
 			return;
 		}
 	}
 	fastboot_func->in_req->complete = compl_do_reset;
 	fastboot_tx_write_str("OKAY");
 }

 static int strcmp_l1(const char *s1, const char *s2)
 {
 	if (!s1 || !s2)
 		return -1;
 	return strncmp(s1, s2, strlen(s1));
 }

 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 	char response[RESPONSE_LEN];
 	const char *s;
 	size_t chars_left;

 	strcpy(response, "OKAY");
 	chars_left = sizeof(response) - strlen(response) - 1;

 	strsep(&cmd, ":");
 	if (!cmd) {
 		error("missing variable\n");
 		fastboot_tx_write_str("FAILmissing var");
 		return;
 	}

 	if (!strcmp_l1("version", cmd)) {
 		strncat(response, FASTBOOT_VERSION, chars_left);
 	} else if (!strcmp_l1("bootloader-version", cmd)) {
 		strncat(response, U_BOOT_VERSION, chars_left);
 	} else if (!strcmp_l1("downloadsize", cmd) ||
 		!strcmp_l1("max-download-size", cmd)) {
 		char str_num[12];

 		sprintf(str_num, "0x%08x", CONFIG_USB_FASTBOOT_BUF_SIZE);
 		strncat(response, str_num, chars_left);
 	} else if (!strcmp_l1("serialno", cmd)) {
 		s = getenv("serial#");
 		if (s)
 			strncat(response, s, chars_left);
 		else
 			strcpy(response, "FAILValue not set");
 	} else {
 		error("unknown variable: %s\n", cmd);
 		strcpy(response, "FAILVariable not implemented");
 	}
 	fastboot_tx_write_str(response);
 }

 static unsigned int rx_bytes_expected(unsigned int maxpacket)
 {
 	int rx_remain = download_size - download_bytes;
 	int rem = 0;
 	if (rx_remain < 0)
 		return 0;
 	if (rx_remain > EP_BUFFER_SIZE)
 		return EP_BUFFER_SIZE;
 	if (rx_remain < maxpacket) {
 		rx_remain = maxpacket;
 	} else if (rx_remain % maxpacket != 0) {
 		rem = rx_remain % maxpacket;
 		rx_remain = rx_remain + (maxpacket - rem);
 	}
 	return rx_remain;
 }

 #define BYTES_PER_DOT	0x20000
 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 {
 	char response[RESPONSE_LEN];
 	unsigned int transfer_size = download_size - download_bytes;
 	const unsigned char *buffer = req->buf;
 	unsigned int buffer_size = req->actual;
 	unsigned int pre_dot_num, now_dot_num;
 	unsigned int max;

 	if (req->status != 0) {
 		printf("Bad status: %d\n", req->status);
 		return;
 	}

 	if (buffer_size < transfer_size)
 		transfer_size = buffer_size;

 	memcpy((void *)CONFIG_USB_FASTBOOT_BUF_ADDR + download_bytes,
 	       buffer, transfer_size);

 	pre_dot_num = download_bytes / BYTES_PER_DOT;
 	download_bytes += transfer_size;
 	now_dot_num = download_bytes / BYTES_PER_DOT;

 	if (pre_dot_num != now_dot_num) {
 		putc('.');
 		if (!(now_dot_num % 74))
 			putc('\n');
 	}

 	/* Check if transfer is done */
 	if (download_bytes >= download_size) {
 		/*
 		 * Reset global transfer variable, keep download_bytes because
 		 * it will be used in the next possible flashing command
 		 */
 		download_size = 0;
 		req->complete = rx_handler_command;
 		req->length = EP_BUFFER_SIZE;

 		sprintf(response, "OKAY");
 		fastboot_tx_write_str(response);

 		printf("\ndownloading of %d bytes finished\n", download_bytes);
 	} else {
 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
 				fs_ep_out.wMaxPacketSize;
 		req->length = rx_bytes_expected(max);
 		if (req->length < ep->maxpacket)
 			req->length = ep->maxpacket;
 	}

 	req->actual = 0;
 	usb_ep_queue(ep, req, 0);
 }

 static void cb_download(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 	char response[RESPONSE_LEN];
 	unsigned int max;

 	strsep(&cmd, ":");
 	download_size = simple_strtoul(cmd, NULL, 16);
 	download_bytes = 0;

 	printf("Starting download of %d bytes\n", download_size);

 	if (0 == download_size) {
 		sprintf(response, "FAILdata invalid size");
 	} else if (download_size > CONFIG_USB_FASTBOOT_BUF_SIZE) {
 		download_size = 0;
 		sprintf(response, "FAILdata too large");
 	} else {
 		sprintf(response, "DATA%08x", download_size);
 		req->complete = rx_handler_dl_image;
 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
 			fs_ep_out.wMaxPacketSize;
 		req->length = rx_bytes_expected(max);
 		if (req->length < ep->maxpacket)
 			req->length = ep->maxpacket;
 	}
 	fastboot_tx_write_str(response);
 }

 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	char boot_addr_start[12];
 	char *bootm_args[] = { "bootm", boot_addr_start, NULL };

 	puts("Booting kernel..\n");

 	sprintf(boot_addr_start, "0x%lx", load_addr);
 	do_bootm(NULL, 0, 2, bootm_args);

 	/* This only happens if image is somehow faulty so we start over */
 	do_reset(NULL, 0, 0, NULL);
 }

 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
 {
 	fastboot_func->in_req->complete = do_bootm_on_complete;
 	fastboot_tx_write_str("OKAY");
 }

 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
 {
 	g_dnl_trigger_detach();
 }

 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
 {
 	fastboot_func->in_req->complete = do_exit_on_complete;
 	fastboot_tx_write_str("OKAY");
 }

 #ifdef CONFIG_FASTBOOT_FLASH
 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 	char response[RESPONSE_LEN];

 	strsep(&cmd, ":");
 	if (!cmd) {
 		error("missing partition name\n");
 		fastboot_tx_write_str("FAILmissing partition name");
 		return;
 	}

 	strcpy(response, "FAILno flash device defined");
 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 	fb_mmc_flash_write(cmd, (void *)CONFIG_USB_FASTBOOT_BUF_ADDR,
 			   download_bytes, response);
 #endif
 	fastboot_tx_write_str(response);
 }
 #endif

 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 #ifdef CONFIG_FASTBOOT_FLASH
 	if (strncmp("format", cmd + 4, 6) == 0) {
 		char cmdbuf[32];
                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
 			CONFIG_FASTBOOT_FLASH_MMC_DEV);
                 if (run_command(cmdbuf, 0))
 			fastboot_tx_write_str("FAIL");
                 else
 			fastboot_tx_write_str("OKAY");
 	} else
 #endif
 	if (strncmp("unlock", cmd + 4, 8) == 0) {
 		fastboot_tx_write_str("FAILnot implemented");
 	}
 	else {
 		fastboot_tx_write_str("FAILunknown oem command");
 	}
 }

 #ifdef CONFIG_FASTBOOT_FLASH
 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmd = req->buf;
 	char response[RESPONSE_LEN];

 	strsep(&cmd, ":");
 	if (!cmd) {
 		error("missing partition name");
 		fastboot_tx_write_str("FAILmissing partition name");
 		return;
 	}

 	strcpy(response, "FAILno flash device defined");

 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 	fb_mmc_erase(cmd, response);
 #endif
 	fastboot_tx_write_str(response);
 }
 #endif

 struct cmd_dispatch_info {
 	char *cmd;
 	void (*cb)(struct usb_ep *ep, struct usb_request *req);
 };

 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
 	{
 		.cmd = "reboot",
 		.cb = cb_reboot,
 	}, {
 		.cmd = "getvar:",
 		.cb = cb_getvar,
 	}, {
 		.cmd = "download:",
 		.cb = cb_download,
 	}, {
 		.cmd = "boot",
 		.cb = cb_boot,
 	}, {
 		.cmd = "continue",
 		.cb = cb_continue,
 	},
 #ifdef CONFIG_FASTBOOT_FLASH
 	{
 		.cmd = "flash",
 		.cb = cb_flash,
 	}, {
 		.cmd = "erase",
 		.cb = cb_erase,
 	},
 #endif
 	{
 		.cmd = "oem",
 		.cb = cb_oem,
 	},
 };

 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
 {
 	char *cmdbuf = req->buf;
 	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
 		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
 			func_cb = cmd_dispatch_info[i].cb;
 			break;
 		}
 	}

 	if (!func_cb) {
 		error("unknown command: %s\n", cmdbuf);
 		fastboot_tx_write_str("FAILunknown command");
 	} else {
 		if (req->actual < req->length) {
 			u8 *buf = (u8 *)req->buf;
 			buf[req->actual] = 0;
 			func_cb(ep, req);
 		} else {
 			error("buffer overflow\n");
 			fastboot_tx_write_str("FAILbuffer overflow");
 		}
 	}

 	if (req->status == 0) {
 		*cmdbuf = '\0';
 		req->actual = 0;
 		usb_ep_queue(ep, req, 0);
 	}
 }
	/*
	* (C) Copyright 2008 - 2009
	* Windriver, <www.windriver.com>
	* Tom Rix <Tom.Rix@windriver.com>
	*
	* Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
	*
	* Copyright 2014 Linaro, Ltd.
	* Rob Herring <robh@kernel.org>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/
	#include <config.h>
	#include <common.h>
	#include <errno.h>
	#include <malloc.h>
	#include <linux/usb/ch9.h>
	#include <linux/usb/gadget.h>
	#include <linux/usb/composite.h>
	#include <linux/compiler.h>
	#include <version.h>
	#include <g_dnl.h>
	#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
	#include <fb_mmc.h>
	#endif

	#define FASTBOOT_VERSION "0.4"

	#define FASTBOOT_INTERFACE_CLASS 0xff
	#define FASTBOOT_INTERFACE_SUB_CLASS 0x42
	#define FASTBOOT_INTERFACE_PROTOCOL 0x03

	#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0 (0x0200)
	#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1 (0x0040)
	#define TX_ENDPOINT_MAXIMUM_PACKET_SIZE (0x0040)

	/* The 64 defined bytes plus \0 */
	#define RESPONSE_LEN (64 + 1)

	#define EP_BUFFER_SIZE 4096

	struct f_fastboot {
	struct usb_function usb_function;

	/* IN/OUT EP's and corresponding requests */
	struct usb_ep in_ep, out_ep;
	struct usb_request in_req, out_req;
	};

	static inline struct f_fastboot func_to_fastboot(struct usb_function f)
	{
	return container_of(f, struct f_fastboot, usb_function);
	}

	static struct f_fastboot *fastboot_func;
	static unsigned int download_size;
	static unsigned int download_bytes;
	static bool is_high_speed;

	static struct usb_endpoint_descriptor fs_ep_in = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = USB_DIR_IN,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize = TX_ENDPOINT_MAXIMUM_PACKET_SIZE,
	.bInterval = 0x00,
	};

	static struct usb_endpoint_descriptor fs_ep_out = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = USB_DIR_OUT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize = RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1,
	.bInterval = 0x00,
	};

	static struct usb_endpoint_descriptor hs_ep_out = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = USB_DIR_OUT,
	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize = RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0,
	.bInterval = 0x00,
	};

	static struct usb_interface_descriptor interface_desc = {
	.bLength = USB_DT_INTERFACE_SIZE,
	.bDescriptorType = USB_DT_INTERFACE,
	.bInterfaceNumber = 0x00,
	.bAlternateSetting = 0x00,
	.bNumEndpoints = 0x02,
	.bInterfaceClass = FASTBOOT_INTERFACE_CLASS,
	.bInterfaceSubClass = FASTBOOT_INTERFACE_SUB_CLASS,
	.bInterfaceProtocol = FASTBOOT_INTERFACE_PROTOCOL,
	};

	static struct usb_descriptor_header *fb_runtime_descs[] = {
	(struct usb_descriptor_header *)&interface_desc,
	(struct usb_descriptor_header *)&fs_ep_in,
	(struct usb_descriptor_header *)&hs_ep_out,
	NULL,
	};

	/*
	* static strings, in UTF-8
	*/
	static const char fastboot_name[] = "Android Fastboot";

	static struct usb_string fastboot_string_defs[] = {
	[0].s = fastboot_name,
	{ } /* end of list */
	};

	static struct usb_gadget_strings stringtab_fastboot = {
	.language = 0x0409, /* en-us */
	.strings = fastboot_string_defs,
	};

	static struct usb_gadget_strings *fastboot_strings[] = {
	&stringtab_fastboot,
	NULL,
	};

	static void rx_handler_command(struct usb_ep ep, struct usb_request req);
	static int strcmp_l1(const char s1, const char s2);

	static void fastboot_complete(struct usb_ep ep, struct usb_request req)
	{
	int status = req->status;
	if (!status)
	return;
	printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
	}

	static int fastboot_bind(struct usb_configuration c, struct usb_function f)
	{
	int id;
	struct usb_gadget *gadget = c->cdev->gadget;
	struct f_fastboot *f_fb = func_to_fastboot(f);
	const char *s;

	/* DYNAMIC interface numbers assignments */
	id = usb_interface_id(c, f);
	if (id < 0)
	return id;
	interface_desc.bInterfaceNumber = id;

	id = usb_string_id(c->cdev);
	if (id < 0)
	return id;
	fastboot_string_defs[0].id = id;
	interface_desc.iInterface = id;

	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
	if (!f_fb->in_ep)
	return -ENODEV;
	f_fb->in_ep->driver_data = c->cdev;

	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
	if (!f_fb->out_ep)
	return -ENODEV;
	f_fb->out_ep->driver_data = c->cdev;

	hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;

	s = getenv("serial#");
	if (s)
	g_dnl_set_serialnumber((char *)s);

	return 0;
	}

	static void fastboot_unbind(struct usb_configuration c, struct usb_function f)
	{
	memset(fastboot_func, 0, sizeof(*fastboot_func));
	}

	static void fastboot_disable(struct usb_function *f)
	{
	struct f_fastboot *f_fb = func_to_fastboot(f);

	usb_ep_disable(f_fb->out_ep);
	usb_ep_disable(f_fb->in_ep);

	if (f_fb->out_req) {
	free(f_fb->out_req->buf);
	usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
	f_fb->out_req = NULL;
	}
	if (f_fb->in_req) {
	free(f_fb->in_req->buf);
	usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
	f_fb->in_req = NULL;
	}
	}

	static struct usb_request fastboot_start_ep(struct usb_ep ep)
	{
	struct usb_request *req;

	req = usb_ep_alloc_request(ep, 0);
	if (!req)
	return NULL;

	req->length = EP_BUFFER_SIZE;
	req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
	if (!req->buf) {
	usb_ep_free_request(ep, req);
	return NULL;
	}

	memset(req->buf, 0, req->length);
	return req;
	}

	static int fastboot_set_alt(struct usb_function *f,
	unsigned interface, unsigned alt)
	{
	int ret;
	struct usb_composite_dev *cdev = f->config->cdev;
	struct usb_gadget *gadget = cdev->gadget;
	struct f_fastboot *f_fb = func_to_fastboot(f);

	debug("%s: func: %s intf: %d alt: %d\n",
	__func__, f->name, interface, alt);

	/* make sure we don't enable the ep twice */
	if (gadget->speed == USB_SPEED_HIGH) {
	ret = usb_ep_enable(f_fb->out_ep, &hs_ep_out);
	is_high_speed = true;
	} else {
	ret = usb_ep_enable(f_fb->out_ep, &fs_ep_out);
	is_high_speed = false;
	}
	if (ret) {
	puts("failed to enable out ep\n");
	return ret;
	}

	f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
	if (!f_fb->out_req) {
	puts("failed to alloc out req\n");
	ret = -EINVAL;
	goto err;
	}
	f_fb->out_req->complete = rx_handler_command;

	ret = usb_ep_enable(f_fb->in_ep, &fs_ep_in);
	if (ret) {
	puts("failed to enable in ep\n");
	goto err;
	}

	f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
	if (!f_fb->in_req) {
	puts("failed alloc req in\n");
	ret = -EINVAL;
	goto err;
	}
	f_fb->in_req->complete = fastboot_complete;

	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
	if (ret)
	goto err;

	return 0;
	err:
	fastboot_disable(f);
	return ret;
	}

	static int fastboot_add(struct usb_configuration *c)
	{
	struct f_fastboot *f_fb = fastboot_func;
	int status;

	debug("%s: cdev: 0x%p\n", __func__, c->cdev);

	if (!f_fb) {
	f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
	if (!f_fb)
	return -ENOMEM;

	fastboot_func = f_fb;
	memset(f_fb, 0, sizeof(*f_fb));
	}

	f_fb->usb_function.name = "f_fastboot";
	f_fb->usb_function.hs_descriptors = fb_runtime_descs;
	f_fb->usb_function.bind = fastboot_bind;
	f_fb->usb_function.unbind = fastboot_unbind;
	f_fb->usb_function.set_alt = fastboot_set_alt;
	f_fb->usb_function.disable = fastboot_disable;
	f_fb->usb_function.strings = fastboot_strings;

	status = usb_add_function(c, &f_fb->usb_function);
	if (status) {
	free(f_fb);
	fastboot_func = f_fb;
	}

	return status;
	}
	DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);

	static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
	{
	struct usb_request *in_req = fastboot_func->in_req;
	int ret;

	memcpy(in_req->buf, buffer, buffer_size);
	in_req->length = buffer_size;
	ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
	if (ret)
	printf("Error %d on queue\n", ret);
	return 0;
	}

	static int fastboot_tx_write_str(const char *buffer)
	{
	return fastboot_tx_write(buffer, strlen(buffer));
	}

	static void compl_do_reset(struct usb_ep ep, struct usb_request req)
	{
	do_reset(NULL, 0, 0, NULL);
	}

	int __weak fb_set_reboot_flag(void)
	{
	return -ENOSYS;
	}

	static void cb_reboot(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	if (!strcmp_l1("reboot-bootloader", cmd)) {
	if (fb_set_reboot_flag()) {
	fastboot_tx_write_str("FAILCannot set reboot flag");
	return;
	}
	}
	fastboot_func->in_req->complete = compl_do_reset;
	fastboot_tx_write_str("OKAY");
	}

	static int strcmp_l1(const char s1, const char s2)
	{
	if (!s1 \|\| !s2)
	return -1;
	return strncmp(s1, s2, strlen(s1));
	}

	static void cb_getvar(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	char response[RESPONSE_LEN];
	const char *s;
	size_t chars_left;

	strcpy(response, "OKAY");
	chars_left = sizeof(response) - strlen(response) - 1;

	strsep(&cmd, ":");
	if (!cmd) {
	error("missing variable\n");
	fastboot_tx_write_str("FAILmissing var");
	return;
	}

	if (!strcmp_l1("version", cmd)) {
	strncat(response, FASTBOOT_VERSION, chars_left);
	} else if (!strcmp_l1("bootloader-version", cmd)) {
	strncat(response, U_BOOT_VERSION, chars_left);
	} else if (!strcmp_l1("downloadsize", cmd) \|\|
	!strcmp_l1("max-download-size", cmd)) {
	char str_num[12];

	sprintf(str_num, "0x%08x", CONFIG_USB_FASTBOOT_BUF_SIZE);
	strncat(response, str_num, chars_left);
	} else if (!strcmp_l1("serialno", cmd)) {
	s = getenv("serial#");
	if (s)
	strncat(response, s, chars_left);
	else
	strcpy(response, "FAILValue not set");
	} else {
	error("unknown variable: %s\n", cmd);
	strcpy(response, "FAILVariable not implemented");
	}
	fastboot_tx_write_str(response);
	}

	static unsigned int rx_bytes_expected(unsigned int maxpacket)
	{
	int rx_remain = download_size - download_bytes;
	int rem = 0;
	if (rx_remain < 0)
	return 0;
	if (rx_remain > EP_BUFFER_SIZE)
	return EP_BUFFER_SIZE;
	if (rx_remain < maxpacket) {
	rx_remain = maxpacket;
	} else if (rx_remain % maxpacket != 0) {
	rem = rx_remain % maxpacket;
	rx_remain = rx_remain + (maxpacket - rem);
	}
	return rx_remain;
	}

	#define BYTES_PER_DOT 0x20000
	static void rx_handler_dl_image(struct usb_ep ep, struct usb_request req)
	{
	char response[RESPONSE_LEN];
	unsigned int transfer_size = download_size - download_bytes;
	const unsigned char *buffer = req->buf;
	unsigned int buffer_size = req->actual;
	unsigned int pre_dot_num, now_dot_num;
	unsigned int max;

	if (req->status != 0) {
	printf("Bad status: %d\n", req->status);
	return;
	}

	if (buffer_size < transfer_size)
	transfer_size = buffer_size;

	memcpy((void *)CONFIG_USB_FASTBOOT_BUF_ADDR + download_bytes,
	buffer, transfer_size);

	pre_dot_num = download_bytes / BYTES_PER_DOT;
	download_bytes += transfer_size;
	now_dot_num = download_bytes / BYTES_PER_DOT;

	if (pre_dot_num != now_dot_num) {
	putc('.');
	if (!(now_dot_num % 74))
	putc('\n');
	}

	/* Check if transfer is done */
	if (download_bytes >= download_size) {
	/*
	* Reset global transfer variable, keep download_bytes because
	* it will be used in the next possible flashing command
	*/
	download_size = 0;
	req->complete = rx_handler_command;
	req->length = EP_BUFFER_SIZE;

	sprintf(response, "OKAY");
	fastboot_tx_write_str(response);

	printf("\ndownloading of %d bytes finished\n", download_bytes);
	} else {
	max = is_high_speed ? hs_ep_out.wMaxPacketSize :
	fs_ep_out.wMaxPacketSize;
	req->length = rx_bytes_expected(max);
	if (req->length < ep->maxpacket)
	req->length = ep->maxpacket;
	}

	req->actual = 0;
	usb_ep_queue(ep, req, 0);
	}

	static void cb_download(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	char response[RESPONSE_LEN];
	unsigned int max;

	strsep(&cmd, ":");
	download_size = simple_strtoul(cmd, NULL, 16);
	download_bytes = 0;

	printf("Starting download of %d bytes\n", download_size);

	if (0 == download_size) {
	sprintf(response, "FAILdata invalid size");
	} else if (download_size > CONFIG_USB_FASTBOOT_BUF_SIZE) {
	download_size = 0;
	sprintf(response, "FAILdata too large");
	} else {
	sprintf(response, "DATA%08x", download_size);
	req->complete = rx_handler_dl_image;
	max = is_high_speed ? hs_ep_out.wMaxPacketSize :
	fs_ep_out.wMaxPacketSize;
	req->length = rx_bytes_expected(max);
	if (req->length < ep->maxpacket)
	req->length = ep->maxpacket;
	}
	fastboot_tx_write_str(response);
	}

	static void do_bootm_on_complete(struct usb_ep ep, struct usb_request req)
	{
	char boot_addr_start[12];
	char *bootm_args[] = { "bootm", boot_addr_start, NULL };

	puts("Booting kernel..\n");

	sprintf(boot_addr_start, "0x%lx", load_addr);
	do_bootm(NULL, 0, 2, bootm_args);

	/* This only happens if image is somehow faulty so we start over */
	do_reset(NULL, 0, 0, NULL);
	}

	static void cb_boot(struct usb_ep ep, struct usb_request req)
	{
	fastboot_func->in_req->complete = do_bootm_on_complete;
	fastboot_tx_write_str("OKAY");
	}

	static void do_exit_on_complete(struct usb_ep ep, struct usb_request req)
	{
	g_dnl_trigger_detach();
	}

	static void cb_continue(struct usb_ep ep, struct usb_request req)
	{
	fastboot_func->in_req->complete = do_exit_on_complete;
	fastboot_tx_write_str("OKAY");
	}

	#ifdef CONFIG_FASTBOOT_FLASH
	static void cb_flash(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	char response[RESPONSE_LEN];

	strsep(&cmd, ":");
	if (!cmd) {
	error("missing partition name\n");
	fastboot_tx_write_str("FAILmissing partition name");
	return;
	}

	strcpy(response, "FAILno flash device defined");
	#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
	fb_mmc_flash_write(cmd, (void *)CONFIG_USB_FASTBOOT_BUF_ADDR,
	download_bytes, response);
	#endif
	fastboot_tx_write_str(response);
	}
	#endif

	static void cb_oem(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	#ifdef CONFIG_FASTBOOT_FLASH
	if (strncmp("format", cmd + 4, 6) == 0) {
	char cmdbuf[32];
	sprintf(cmdbuf, "gpt write mmc %x $partitions",
	CONFIG_FASTBOOT_FLASH_MMC_DEV);
	if (run_command(cmdbuf, 0))
	fastboot_tx_write_str("FAIL");
	else
	fastboot_tx_write_str("OKAY");
	} else
	#endif
	if (strncmp("unlock", cmd + 4, 8) == 0) {
	fastboot_tx_write_str("FAILnot implemented");
	}
	else {
	fastboot_tx_write_str("FAILunknown oem command");
	}
	}

	#ifdef CONFIG_FASTBOOT_FLASH
	static void cb_erase(struct usb_ep ep, struct usb_request req)
	{
	char *cmd = req->buf;
	char response[RESPONSE_LEN];

	strsep(&cmd, ":");
	if (!cmd) {
	error("missing partition name");
	fastboot_tx_write_str("FAILmissing partition name");
	return;
	}

	strcpy(response, "FAILno flash device defined");

	#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
	fb_mmc_erase(cmd, response);
	#endif
	fastboot_tx_write_str(response);
	}
	#endif

	struct cmd_dispatch_info {
	char *cmd;
	void (cb)(struct usb_ep ep, struct usb_request *req);
	};

	static const struct cmd_dispatch_info cmd_dispatch_info[] = {
	{
	.cmd = "reboot",
	.cb = cb_reboot,
	}, {
	.cmd = "getvar:",
	.cb = cb_getvar,
	}, {
	.cmd = "download:",
	.cb = cb_download,
	}, {
	.cmd = "boot",
	.cb = cb_boot,
	}, {
	.cmd = "continue",
	.cb = cb_continue,
	},
	#ifdef CONFIG_FASTBOOT_FLASH
	{
	.cmd = "flash",
	.cb = cb_flash,
	}, {
	.cmd = "erase",
	.cb = cb_erase,
	},
	#endif
	{
	.cmd = "oem",
	.cb = cb_oem,
	},
	};

	static void rx_handler_command(struct usb_ep ep, struct usb_request req)
	{
	char *cmdbuf = req->buf;
	void (func_cb)(struct usb_ep ep, struct usb_request *req) = NULL;
	int i;

	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
	if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
	func_cb = cmd_dispatch_info[i].cb;
	break;
	}
	}

	if (!func_cb) {
	error("unknown command: %s\n", cmdbuf);
	fastboot_tx_write_str("FAILunknown command");
	} else {
	if (req->actual < req->length) {
	u8 buf = (u8 )req->buf;
	buf[req->actual] = 0;
	func_cb(ep, req);
	} else {
	error("buffer overflow\n");
	fastboot_tx_write_str("FAILbuffer overflow");
	}
	}

	if (req->status == 0) {
	*cmdbuf = '\0';
	req->actual = 0;
	usb_ep_queue(ep, req, 0);
	}
	}