[PATCH v2] USB: gadget: Add Android fastboot support

[PATCH v2] USB: gadget: Add Android fastboot support

[Sascha Hauer]

The Android fastboot protocol Can be used to update firmware and to
issue other lowlevel commands to the bootloader. This adds a
fastboot implementation based on the U-Boot fatboot code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---

Changes since v1:

- Fill partition-type variables with the different flash types
- Print more messages to the USB host instead of printing them on the
  command line
- implement flash erase command
- detect UBI images and use ubiformat in this case

 drivers/usb/gadget/Kconfig      |   5 +-
 drivers/usb/gadget/Makefile     |   1 +
 drivers/usb/gadget/f_fastboot.c | 890 ++++++++++++++++++++++++++++++++++++++++
 include/usb/fastboot.h          |  13 +
 4 files changed, 908 insertions(+), 1 deletion(-)
 create mode 100644 drivers/usb/gadget/f_fastboot.c
 create mode 100644 include/usb/fastboot.h

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 94d3bce..883a19f 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -49,5 +49,8 @@ config USB_GADGET_SERIAL
 	depends on !CONSOLE_NONE
 	prompt "Serial Gadget"
 
-endif
+config USB_GADGET_FASTBOOT
+	bool
+	prompt "Android Fastboot support"
 
+endif
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 9bd28ec..fce979a 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -2,6 +2,7 @@
 obj-$(CONFIG_USB_GADGET) += composite.o config.o usbstring.o epautoconf.o udc-core.o functions.o config.o
 obj-$(CONFIG_USB_GADGET_SERIAL) += u_serial.o serial.o f_serial.o f_acm.o
 obj-$(CONFIG_USB_GADGET_DFU) += dfu.o
+obj-$(CONFIG_USB_GADGET_FASTBOOT) += f_fastboot.o
 obj-$(CONFIG_USB_GADGET_DRIVER_ARC) += fsl_udc.o
 obj-$(CONFIG_USB_GADGET_DRIVER_AT91) += at91_udc.o
 obj-$(CONFIG_USB_GADGET_DRIVER_PXA27X) += pxa27x_udc.o
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
new file mode 100644
index 0000000..9aec6b1
--- /dev/null
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -0,0 +1,890 @@
+/*
+ * (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>
+ *
+ * Copyright 2014 Sascha Hauer <s.hauer@pengutronix.de>
+ * Ported to barebox
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define pr_fmt(fmt) "fastboot: " fmt
+
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fcntl.h>
+#include <clock.h>
+#include <ioctl.h>
+#include <libbb.h>
+#include <boot.h>
+#include <dma.h>
+#include <fs.h>
+#include <file-list.h>
+#include <progress.h>
+#include <environment.h>
+#include <globalvar.h>
+#include <usb/ch9.h>
+#include <usb/gadget.h>
+#include <usb/fastboot.h>
+#include <usb/composite.h>
+#include <linux/err.h>
+#include <linux/compiler.h>
+#include <linux/stat.h>
+#include <linux/mtd/mtd-abi.h>
+
+#define FASTBOOT_VERSION		"0.4"
+
+#define FASTBOOT_INTERFACE_CLASS	0xff
+#define FASTBOOT_INTERFACE_SUB_CLASS	0x42
+#define FASTBOOT_INTERFACE_PROTOCOL	0x03
+
+#define FASTBOOT_TMPFILE		"/.fastboot.img"
+
+#define EP_BUFFER_SIZE			4096
+
+struct fb_variable {
+	char *name;
+	char *value;
+	struct list_head list;
+};
+
+struct f_fastboot {
+	struct usb_function func;
+
+	/* IN/OUT EP's and correspoinding requests */
+	struct usb_ep *in_ep, *out_ep;
+	struct usb_request *in_req, *out_req;
+	struct file_list *files;
+	int download_fd;
+	size_t download_bytes;
+	size_t download_size;
+	struct list_head variables;
+};
+
+static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
+{
+	return container_of(f, struct f_fastboot, func);
+}
+
+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		= cpu_to_le16(64),
+	.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		= cpu_to_le16(64),
+	.bInterval		= 0x00,
+};
+
+static struct usb_endpoint_descriptor hs_ep_in = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_IN,
+	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize		= cpu_to_le16(512),
+	.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		= cpu_to_le16(512),
+	.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_fs_descs[] = {
+	(struct usb_descriptor_header *)&interface_desc,
+	(struct usb_descriptor_header *)&fs_ep_in,
+	(struct usb_descriptor_header *)&fs_ep_out,
+	NULL,
+};
+
+static struct usb_descriptor_header *fb_hs_descs[] = {
+	(struct usb_descriptor_header *)&interface_desc,
+	(struct usb_descriptor_header *)&hs_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 in_req_complete;
+
+static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	int status = req->status;
+
+	in_req_complete = 1;
+
+	pr_debug("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
+}
+
+static struct usb_request *fastboot_alloc_request(struct usb_ep *ep)
+{
+	struct usb_request *req;
+
+	req = usb_ep_alloc_request(ep);
+	if (!req)
+		return NULL;
+
+	req->length = EP_BUFFER_SIZE;
+	req->buf = dma_alloc(EP_BUFFER_SIZE);
+	if (!req->buf) {
+		usb_ep_free_request(ep, req);
+		return NULL;
+	}
+	memset(req->buf, 0, EP_BUFFER_SIZE);
+
+	return req;
+}
+
+static void fb_setvar(struct fb_variable *var, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	var->value = vasprintf(fmt, ap);
+	va_end(ap);
+}
+
+static struct fb_variable *fb_addvar(struct f_fastboot *f_fb, const char *fmt, ...)
+{
+	struct fb_variable *var = xzalloc(sizeof(*var));
+	va_list ap;
+
+	va_start(ap, fmt);
+	var->name = vasprintf(fmt, ap);
+	va_end(ap);
+
+	list_add_tail(&var->list, &f_fb->variables);
+
+	return var;
+}
+
+static int fastboot_add_partition_variables(struct f_fastboot *f_fb,
+		struct file_list_entry *fentry)
+{
+	struct stat s;
+	size_t size = 0;
+	int fd, ret;
+	struct mtd_info_user mtdinfo;
+	char *type = NULL;
+	struct fb_variable *var;
+
+	ret = stat(fentry->filename, &s);
+	if (ret) {
+		if (fentry->flags & FILE_LIST_FLAG_CREATE) {
+			ret = 0;
+			type = "file";
+			goto out;
+		}
+
+		goto out;
+	}
+
+	fd = open(fentry->filename, O_RDWR);
+	if (fd < 0) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	size = s.st_size;
+
+	ret = ioctl(fd, MEMGETINFO, &mtdinfo);
+
+	close(fd);
+
+	if (!ret) {
+		switch (mtdinfo.type) {
+		case MTD_NANDFLASH:
+			type = "NAND-flash";
+			break;
+		case MTD_NORFLASH:
+			type = "NOR-flash";
+			break;
+		case MTD_UBIVOLUME:
+			type = "UBI";
+			break;
+		default:
+			type = "flash";
+			break;
+		}
+
+		goto out;
+	}
+
+	type = "basic";
+	ret = 0;
+
+out:
+	if (ret)
+		return ret;
+
+	var = fb_addvar(f_fb, "partition-size:%s", fentry->name);
+	fb_setvar(var, "%08zx", size);
+	var = fb_addvar(f_fb, "partition-type:%s", fentry->name);
+	fb_setvar(var, "%s", type);
+
+	return ret;
+}
+
+static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	int id, ret;
+	struct usb_gadget *gadget = c->cdev->gadget;
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+	struct usb_string *us;
+	const struct usb_function_instance *fi = f->fi;
+	struct f_fastboot_opts *opts = container_of(fi, struct f_fastboot_opts, func_inst);
+	struct file_list_entry *fentry;
+	struct fb_variable *var;
+
+	f_fb->files = opts->files;
+
+	var = fb_addvar(f_fb, "version");
+	fb_setvar(var, "0.4");
+	var = fb_addvar(f_fb, "bootloader-version");
+	fb_setvar(var, release_string);
+
+	file_list_for_each_entry(f_fb->files, fentry) {
+		ret = fastboot_add_partition_variables(f_fb, fentry);
+		if (ret)
+			return ret;
+	}
+
+	/* 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;
+
+	us = usb_gstrings_attach(cdev, fastboot_strings, 1);
+	if (IS_ERR(us)) {
+		ret = PTR_ERR(us);
+		return ret;
+	}
+
+	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;
+	hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress;
+
+	f_fb->out_req = fastboot_alloc_request(f_fb->out_ep);
+	if (!f_fb->out_req) {
+		puts("failed to alloc out req\n");
+		ret = -EINVAL;
+		return ret;
+	}
+
+	f_fb->out_req->complete = rx_handler_command;
+	f_fb->out_req->context = f_fb;
+
+	f_fb->in_req = fastboot_alloc_request(f_fb->in_ep);
+	if (!f_fb->in_req) {
+		puts("failed alloc req in\n");
+		ret = -EINVAL;
+		return ret;
+	}
+	f_fb->in_req->complete = fastboot_complete;
+	f_fb->out_req->context = f_fb;
+
+	ret = usb_assign_descriptors(f, fb_fs_descs, fb_hs_descs, NULL);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+	struct fb_variable *var, *tmp;
+
+	usb_ep_dequeue(f_fb->in_ep, 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;
+
+	usb_ep_dequeue(f_fb->out_ep, 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;
+
+	list_for_each_entry_safe(var, tmp, &f_fb->variables, list) {
+		free(var->name);
+		free(var->value);
+		list_del(&var->list);
+		free(var);
+	}
+}
+
+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);
+}
+
+static int fastboot_set_alt(struct usb_function *f,
+			    unsigned interface, unsigned alt)
+{
+	int ret;
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+
+	pr_debug("%s: func: %s intf: %d alt: %d\n",
+	      __func__, f->name, interface, alt);
+
+	ret = config_ep_by_speed(f->config->cdev->gadget, f,
+			f_fb->out_ep);
+	if (ret)
+		return ret;
+
+	ret = usb_ep_enable(f_fb->out_ep);
+	if (ret) {
+		pr_err("failed to enable out ep: %s\n", strerror(-ret));
+		return ret;
+	}
+
+	ret = config_ep_by_speed(f->config->cdev->gadget, f,
+			f_fb->in_ep);
+	if (ret)
+		return ret;
+
+	ret = usb_ep_enable(f_fb->in_ep);
+	if (ret) {
+		pr_err("failed to enable in ep: %s\n", strerror(-ret));
+		return ret;
+	}
+
+	memset(f_fb->out_req->buf, 0, EP_BUFFER_SIZE);
+	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req);
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	fastboot_disable(f);
+	return ret;
+}
+
+static void fastboot_free_func(struct usb_function *f)
+{
+	struct f_fastboot *f_fb = container_of(f, struct f_fastboot, func);
+
+	free(f_fb);
+}
+
+static struct usb_function *fastboot_alloc_func(struct usb_function_instance *fi)
+{
+	struct f_fastboot *f_fb;
+
+	f_fb = xzalloc(sizeof(*f_fb));
+
+	INIT_LIST_HEAD(&f_fb->variables);
+
+	f_fb->func.name = "fastboot";
+	f_fb->func.strings = fastboot_strings;
+	f_fb->func.bind = fastboot_bind;
+	f_fb->func.set_alt = fastboot_set_alt;
+	f_fb->func.disable = fastboot_disable;
+	f_fb->func.unbind = fastboot_unbind;
+	f_fb->func.free_func = fastboot_free_func;
+
+	return &f_fb->func;
+}
+
+static void fastboot_free_instance(struct usb_function_instance *fi)
+{
+	struct f_fastboot_opts *opts;
+
+	opts = container_of(fi, struct f_fastboot_opts, func_inst);
+	kfree(opts);
+}
+
+static struct usb_function_instance *fastboot_alloc_instance(void)
+{
+	struct f_fastboot_opts *opts;
+
+	opts = xzalloc(sizeof(*opts));
+	opts->func_inst.free_func_inst = fastboot_free_instance;
+
+	return &opts->func_inst;
+}
+
+DECLARE_USB_FUNCTION_INIT(fastboot, fastboot_alloc_instance, fastboot_alloc_func);
+
+static int fastboot_tx_write(struct f_fastboot *f_fb, const char *buffer, unsigned int buffer_size)
+{
+	struct usb_request *in_req = f_fb->in_req;
+	uint64_t start;
+	int ret;
+
+	memcpy(in_req->buf, buffer, buffer_size);
+	in_req->length = buffer_size;
+	in_req_complete = 0;
+	ret = usb_ep_queue(f_fb->in_ep, in_req);
+	if (ret)
+		pr_err("Error %d on queue\n", ret);
+
+	start = get_time_ns();
+
+	while (!in_req_complete) {
+		if (is_timeout(start, 2 * SECOND))
+			return -ETIMEDOUT;
+		usb_gadget_poll();
+	}
+
+	return 0;
+}
+
+static int fastboot_tx_print(struct f_fastboot *f_fb, const char *fmt, ...)
+{
+	char buf[64];
+	va_list ap;
+	int n;
+
+	va_start(ap, fmt);
+	n = vsnprintf(buf, 64, fmt, ap);
+	va_end(ap);
+
+	if (n > 64)
+		n = 64;
+
+	return fastboot_tx_write(f_fb, buf, n);
+}
+
+static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
+{
+	reset_cpu(0);
+}
+
+static void cb_reboot(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+
+	f_fb->in_req->complete = compl_do_reset;
+	fastboot_tx_print(f_fb, "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, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	struct fb_variable *var;
+
+	pr_debug("getvar: \"%s\"\n", cmd);
+
+	if (!strcmp_l1(cmd, "all")) {
+		list_for_each_entry(var, &f_fb->variables, list) {
+			fastboot_tx_print(f_fb, "INFO%s: %s", var->name, var->value);
+		}
+		fastboot_tx_print(f_fb, "OKAY");
+		return;
+	}
+
+	list_for_each_entry(var, &f_fb->variables, list) {
+		if (!strcmp(cmd, var->name)) {
+			fastboot_tx_print(f_fb, "OKAY%s", var->value);
+			return;
+		}
+	}
+
+	fastboot_tx_print(f_fb, "OKAY");
+}
+
+static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_fastboot *f_fb = req->context;
+	const unsigned char *buffer = req->buf;
+	int ret;
+
+	if (req->status != 0) {
+		pr_err("Bad status: %d\n", req->status);
+		return;
+	}
+
+	ret = write(f_fb->download_fd, buffer, req->actual);
+	if (ret < 0) {
+		fastboot_tx_print(f_fb, "FAIL%s", strerror(-ret));
+		return;
+	}
+
+	f_fb->download_bytes += req->actual;
+
+	req->length = f_fb->download_size - f_fb->download_bytes;
+	if (req->length > EP_BUFFER_SIZE)
+		req->length = EP_BUFFER_SIZE;
+
+	show_progress(f_fb->download_bytes);
+
+	/* Check if transfer is done */
+	if (f_fb->download_bytes >= f_fb->download_size) {
+		req->complete = rx_handler_command;
+		req->length = EP_BUFFER_SIZE;
+
+		fastboot_tx_print(f_fb, "INFODownloading %d bytes finished",
+				f_fb->download_bytes);
+
+		fastboot_tx_print(f_fb, "OKAY");
+
+		printf("\n");
+	}
+
+	req->actual = 0;
+	usb_ep_queue(ep, req);
+}
+
+static void cb_download(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+
+	f_fb->download_size = simple_strtoul(cmd, NULL, 16);
+	f_fb->download_bytes = 0;
+
+	fastboot_tx_print(f_fb, "INFODownloading %d bytes...", f_fb->download_size);
+
+	init_progression_bar(f_fb->download_size);
+
+	f_fb->download_fd = open(FASTBOOT_TMPFILE, O_WRONLY | O_CREAT | O_TRUNC);
+	if (f_fb->download_fd < 0) {
+		fastboot_tx_print(f_fb, "FAILInternal Error");
+		return;
+	}
+
+	if (!f_fb->download_size) {
+		fastboot_tx_print(f_fb, "FAILdata invalid size");
+	} else {
+		fastboot_tx_print(f_fb, "DATA%08x", f_fb->download_size);
+		req->complete = rx_handler_dl_image;
+		req->length = EP_BUFFER_SIZE;
+		if (req->length < ep->maxpacket)
+			req->length = ep->maxpacket;
+	}
+}
+
+static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	int ret;
+	struct bootm_data data = {
+		.initrd_address = UIMAGE_INVALID_ADDRESS,
+		.os_address = UIMAGE_SOME_ADDRESS,
+	};
+
+	pr_info("Booting kernel..\n");
+
+	globalvar_set_match("linux.bootargs.dyn.", "");
+	globalvar_set_match("bootm.", "");
+
+	data.os_file = xstrdup(FASTBOOT_TMPFILE);
+
+	ret = bootm_boot(&data);
+	if (ret)
+		pr_err("Booting failed\n");
+}
+
+static void cb_boot(struct usb_ep *ep, struct usb_request *req, const char *opt)
+{
+	struct f_fastboot *f_fb = req->context;
+
+	f_fb->in_req->complete = do_bootm_on_complete;
+	fastboot_tx_print(f_fb, "OKAY");
+}
+
+static void cb_flash(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	struct file_list_entry *fentry;
+	int ret;
+	const char *filename = NULL;
+	enum filetype filetype = file_name_detect_type(FASTBOOT_TMPFILE);
+
+	fastboot_tx_print(f_fb, "INFOCopying file to %s...", cmd);
+
+	file_list_for_each_entry(f_fb->files, fentry) {
+		if (!strcmp(cmd, fentry->name)) {
+			filename = fentry->filename;
+			break;
+		}
+	}
+
+	if (!filename) {
+		fastboot_tx_print(f_fb, "FAILNo such partition: %s", cmd);
+		return;
+	}
+
+	if (filetype == filetype_ubi) {
+		char *cmd = asprintf("ubiformat -y -f %s %s", FASTBOOT_TMPFILE, filename);
+
+		fastboot_tx_print(f_fb, "INFOThis is an UBI image...");
+
+		ret = run_command(cmd);
+
+		free(cmd);
+
+		if (ret) {
+			fastboot_tx_print(f_fb, "FAILwrite partition: %s", strerror(-ret));
+			return;
+		}
+
+		goto out;
+	}
+
+	ret = copy_file(FASTBOOT_TMPFILE, filename, 1);
+	if (ret) {
+		fastboot_tx_print(f_fb, "FAILwrite partition: %s", strerror(-ret));
+		return;
+	}
+
+out:
+	fastboot_tx_print(f_fb, "OKAY");
+}
+
+static void cb_erase(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	struct file_list_entry *fentry;
+	int ret;
+	const char *filename = NULL;
+	int fd;
+
+	fastboot_tx_print(f_fb, "INFOErasing %s...", cmd);
+
+	file_list_for_each_entry(f_fb->files, fentry) {
+		if (!strcmp(cmd, fentry->name)) {
+			filename = fentry->filename;
+			break;
+		}
+	}
+
+	if (!filename) {
+		fastboot_tx_print(f_fb, "FAILNo such partition: %s", cmd);
+		return;
+	}
+
+	fd = open(filename, O_RDWR);
+	if (fd < 0)
+		fastboot_tx_print(f_fb, "FAIL%s", strerror(-fd));
+
+	ret = erase(fd, ~0, 0);
+
+	close(fd);
+
+	if (ret)
+		fastboot_tx_print(f_fb, "FAILcannot erase partition %s: %s",
+				filename, strerror(-ret));
+	else
+		fastboot_tx_print(f_fb, "OKAY");
+}
+
+struct cmd_dispatch_info {
+	char *cmd;
+	void (*cb)(struct usb_ep *ep, struct usb_request *req, const char *opt);
+};
+
+static void fb_run_command(struct usb_ep *ep, struct usb_request *req, const char *cmd,
+		const struct cmd_dispatch_info *cmds, int num_commands)
+{
+	void (*func_cb)(struct usb_ep *ep, struct usb_request *req, const char *cmd) = NULL;
+	struct f_fastboot *f_fb = req->context;
+	int i;
+
+	for (i = 0; i < num_commands; i++) {
+		if (!strcmp_l1(cmds[i].cmd, cmd)) {
+			func_cb = cmds[i].cb;
+			cmd += strlen(cmds[i].cmd);
+			func_cb(ep, req, cmd);
+			return;
+		}
+	}
+
+	fastboot_tx_print(f_fb, "FAILunknown command %s", cmd);
+}
+
+static void cb_oem_getenv(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	const char *value;
+
+	pr_debug("%s: \"%s\"\n", __func__, cmd);
+
+	value = getenv(cmd);
+
+	fastboot_tx_print(f_fb, "INFO%s", value ? value : "");
+	fastboot_tx_print(f_fb, "OKAY");
+}
+
+static void cb_oem_setenv(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	char *var = xstrdup(cmd);
+	char *value;
+	int ret;
+
+	pr_debug("%s: \"%s\"\n", __func__, cmd);
+
+	value = strchr(var, '=');
+	if (!value) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	*value++ = 0;
+
+	ret = setenv(var, value);
+	if (ret)
+		goto out;
+
+	fastboot_tx_print(f_fb, "OKAY");
+out:
+	free(var);
+
+	if (ret)
+		fastboot_tx_print(f_fb, "FAIL%s", strerror(-ret));
+}
+
+static void cb_oem_exec(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	struct f_fastboot *f_fb = req->context;
+	int ret;
+
+	ret = run_command(cmd);
+	if (ret < 0)
+		fastboot_tx_print(f_fb, "FAIL%s", strerror(-ret));
+	else if (ret > 0)
+		fastboot_tx_print(f_fb, "FAIL");
+	else
+		fastboot_tx_print(f_fb, "OKAY");
+}
+
+static const struct cmd_dispatch_info cmd_oem_dispatch_info[] = {
+	{
+		.cmd = "getenv ",
+		.cb = cb_oem_getenv,
+	}, {
+		.cmd = "setenv ",
+		.cb = cb_oem_setenv,
+	}, {
+		.cmd = "exec ",
+		.cb = cb_oem_exec,
+	},
+};
+
+static void cb_oem(struct usb_ep *ep, struct usb_request *req, const char *cmd)
+{
+	pr_debug("%s: \"%s\"\n", __func__, cmd);
+
+	fb_run_command(ep, req, cmd, cmd_oem_dispatch_info, ARRAY_SIZE(cmd_oem_dispatch_info));
+}
+
+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 = "flash:",
+		.cb = cb_flash,
+	}, {
+		.cmd = "erase:",
+		.cb = cb_erase,
+	}, {
+		.cmd = "oem ",
+		.cb = cb_oem,
+	},
+};
+
+static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
+{
+	char *cmdbuf = req->buf;
+
+	if (req->status != 0)
+		return;
+
+	*(cmdbuf + req->actual) = 0;
+
+	fb_run_command(ep, req, cmdbuf, cmd_dispatch_info,
+				ARRAY_SIZE(cmd_dispatch_info));
+
+	*cmdbuf = '\0';
+	req->actual = 0;
+	memset(req->buf, 0, EP_BUFFER_SIZE);
+	usb_ep_queue(ep, req);
+}
diff --git a/include/usb/fastboot.h b/include/usb/fastboot.h
new file mode 100644
index 0000000..dab5a9a
--- /dev/null
+++ b/include/usb/fastboot.h
@@ -0,0 +1,13 @@
+#ifndef _USB_FASTBOOT_H
+#define _USB_FASTBOOT_H
+
+#include <linux/types.h>
+#include <file-list.h>
+#include <usb/composite.h>
+
+struct f_fastboot_opts {
+	struct usb_function_instance func_inst;
+	struct file_list *files;
+};
+
+#endif /* _USB_FASTBOOT_H */
-- 
2.0.1


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