1 files changed, 489 insertions, 0 deletions

diff --git a/drivers/usb/gadget/function/f_fastboot.c b/drivers/usb/gadget/function/f_fastboot.c
new file mode 100644
index 0000000000..078b37ce54
--- /dev/null
+++ b/drivers/usb/gadget/function/f_fastboot.c
@@ -0,0 +1,489 @@
+/*
+ * (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
+ *
+ * Copyright 2020 Edmund Henniges <eh@emlix.com>
+ * Copyright 2020 Daniel Glöckner <dg@emlix.com>
+ * Split off of generic parts
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define pr_fmt(fmt) "fastboot: " fmt
+
+#include <dma.h>
+#include <work.h>
+#include <unistd.h>
+#include <progress.h>
+#include <fastboot.h>
+#include <usb/fastboot.h>
+
+#define FASTBOOT_INTERFACE_CLASS	0xff
+#define FASTBOOT_INTERFACE_SUB_CLASS	0x42
+#define FASTBOOT_INTERFACE_PROTOCOL	0x03
+
+#define EP_BUFFER_SIZE			4096
+
+struct f_fastboot {
+	struct fastboot fastboot;
+	struct usb_function func;
+
+	/* IN/OUT EP's and corresponding requests */
+	struct usb_ep *in_ep, *out_ep;
+	struct usb_request *out_req;
+	struct work_queue wq;
+};
+
+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 fastboot_write_usb(struct fastboot *fb, const char *buffer,
+			      unsigned int buffer_size);
+static void fastboot_start_download_usb(struct fastboot *fb);
+
+struct fastboot_work {
+	struct work_struct work;
+	struct f_fastboot *f_fb;
+	char command[FASTBOOT_MAX_CMD_LEN + 1];
+};
+
+static void fastboot_do_work(struct work_struct *w)
+{
+	struct fastboot_work *fw = container_of(w, struct fastboot_work, work);
+	struct f_fastboot *f_fb = fw->f_fb;
+
+	fastboot_exec_cmd(&f_fb->fastboot, fw->command);
+
+	memset(f_fb->out_req->buf, 0, EP_BUFFER_SIZE);
+	usb_ep_queue(f_fb->out_ep, f_fb->out_req);
+
+	free(fw);
+}
+
+static void fastboot_work_cancel(struct work_struct *w)
+{
+	struct fastboot_work *fw = container_of(w, struct fastboot_work, work);
+
+	free(fw);
+}
+
+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 fastboot_free_request(struct usb_ep *ep, struct usb_request *req)
+{
+	free(req->buf);
+	usb_ep_free_request(ep, req);
+}
+
+static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	fastboot_free_request(ep, req);
+}
+
+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);
+
+	f_fb->fastboot.write = fastboot_write_usb;
+	f_fb->fastboot.start_download = fastboot_start_download_usb;
+
+	f_fb->fastboot.files = opts->common.files;
+	f_fb->fastboot.cmd_exec = opts->common.cmd_exec;
+	f_fb->fastboot.cmd_flash = opts->common.cmd_flash;
+
+	f_fb->wq.fn = fastboot_do_work;
+	f_fb->wq.cancel = fastboot_work_cancel;
+
+	wq_register(&f_fb->wq);
+
+	ret = fastboot_generic_init(&f_fb->fastboot, opts->common.export_bbu);
+	if (ret)
+		goto err_wq_unregister;
+
+	/* DYNAMIC interface numbers assignments */
+	id = usb_interface_id(c, f);
+	if (id < 0) {
+		ret = id;
+		goto fb_generic_free;
+	}
+
+	interface_desc.bInterfaceNumber = id;
+
+	id = usb_string_id(c->cdev);
+	if (id < 0) {
+		ret = id;
+		goto fb_generic_free;
+	}
+	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);
+		goto fb_generic_free;
+	}
+
+	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
+	if (!f_fb->in_ep) {
+		ret = -ENODEV;
+		goto fb_generic_free;
+	}
+	f_fb->in_ep->driver_data = c->cdev;
+
+	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
+	if (!f_fb->out_ep) {
+		ret = -ENODEV;
+		goto fb_generic_free;
+	}
+	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;
+		goto fb_generic_free;
+	}
+
+	f_fb->out_req->complete = rx_handler_command;
+	f_fb->out_req->context = f_fb;
+
+	ret = usb_assign_descriptors(f, fb_fs_descs, fb_hs_descs, NULL);
+	if (ret)
+		goto err_free_in_req;
+
+	return 0;
+
+err_free_in_req:
+	free(f_fb->out_req->buf);
+	usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
+fb_generic_free:
+	fastboot_generic_free(&f_fb->fastboot);
+err_wq_unregister:
+	wq_unregister(&f_fb->wq);
+
+	return ret;
+}
+
+static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+
+	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;
+
+	wq_unregister(&f_fb->wq);
+
+	fastboot_generic_free(&f_fb->fastboot);
+}
+
+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);
+
+	fastboot_generic_close(&f_fb->fastboot);
+	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));
+
+	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_write_usb(struct fastboot *fb, const char *buffer, unsigned int buffer_size)
+{
+	struct f_fastboot *f_fb = container_of(fb, struct f_fastboot, fastboot);
+	struct usb_request *in_req;
+	int ret;
+
+	in_req = fastboot_alloc_request(f_fb->in_ep);
+	if (!in_req)
+		return -ENOMEM;
+
+	memcpy(in_req->buf, buffer, buffer_size);
+	in_req->length = buffer_size;
+	in_req->complete = fastboot_complete;
+
+	ret = usb_ep_queue(f_fb->in_ep, in_req);
+	if (ret) {
+		fastboot_free_request(f_fb->in_ep, in_req);
+		pr_err("Error %d on queue\n", ret);
+	}
+
+	return 0;
+}
+
+static int rx_bytes_expected(struct f_fastboot *f_fb)
+{
+	int remaining = f_fb->fastboot.download_size
+		      - f_fb->fastboot.download_bytes;
+
+	if (remaining >= EP_BUFFER_SIZE)
+		return EP_BUFFER_SIZE;
+
+	return ALIGN(remaining, f_fb->out_ep->maxpacket);
+}
+
+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 = fastboot_handle_download_data(&f_fb->fastboot, buffer,
+					    req->actual);
+	if (ret < 0) {
+		fastboot_tx_print(&f_fb->fastboot, FASTBOOT_MSG_FAIL,
+				  strerror(-ret));
+		return;
+	}
+
+	req->length = rx_bytes_expected(f_fb);
+
+	/* Check if transfer is done */
+	if (f_fb->fastboot.download_bytes >= f_fb->fastboot.download_size) {
+		req->complete = rx_handler_command;
+		req->length = EP_BUFFER_SIZE;
+
+		fastboot_download_finished(&f_fb->fastboot);
+	}
+
+	req->actual = 0;
+	usb_ep_queue(ep, req);
+}
+
+static void fastboot_start_download_usb(struct fastboot *fb)
+{
+	struct f_fastboot *f_fb = container_of(fb, struct f_fastboot, fastboot);
+	struct usb_request *req = f_fb->out_req;
+
+	req->complete = rx_handler_dl_image;
+	req->length = rx_bytes_expected(f_fb);
+	fastboot_start_download_generic(fb);
+}
+
+static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_fastboot *f_fb = req->context;
+	struct fastboot_work *w;
+	int len;
+
+	if (req->status != 0)
+		return;
+
+	w = xzalloc(sizeof(*w));
+	w->f_fb = f_fb;
+
+	len = min_t(unsigned int, req->actual, FASTBOOT_MAX_CMD_LEN);
+
+	memcpy(w->command, req->buf, len);
+
+	wq_queue_work(&f_fb->wq, &w->work);
+}