xref: /openbmc/u-boot/drivers/usb/gadget/f_fastboot.c (revision 0b45a79f) 
1 /*
2  * (C) Copyright 2008 - 2009
3  * Windriver, <www.windriver.com>
4  * Tom Rix <Tom.Rix@windriver.com>
5  *
6  * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
7  *
8  * Copyright 2014 Linaro, Ltd.
9  * Rob Herring <robh@kernel.org>
10  *
11  * SPDX-License-Identifier:	GPL-2.0+
12  */
13 #include <config.h>
14 #include <common.h>
15 #include <errno.h>
16 #include <fastboot.h>
17 #include <malloc.h>
18 #include <linux/usb/ch9.h>
19 #include <linux/usb/gadget.h>
20 #include <linux/usb/composite.h>
21 #include <linux/compiler.h>
22 #include <version.h>
23 #include <g_dnl.h>
24 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
25 #include <fb_mmc.h>
26 #endif
27 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
28 #include <fb_nand.h>
29 #endif
30 
31 #define FASTBOOT_VERSION		"0.4"
32 
33 #define FASTBOOT_INTERFACE_CLASS	0xff
34 #define FASTBOOT_INTERFACE_SUB_CLASS	0x42
35 #define FASTBOOT_INTERFACE_PROTOCOL	0x03
36 
37 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
38 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
39 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
40 
41 #define EP_BUFFER_SIZE			4096
42 
43 struct f_fastboot {
44 	struct usb_function usb_function;
45 
46 	/* IN/OUT EP's and corresponding requests */
47 	struct usb_ep *in_ep, *out_ep;
48 	struct usb_request *in_req, *out_req;
49 };
50 
51 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
52 {
53 	return container_of(f, struct f_fastboot, usb_function);
54 }
55 
56 static struct f_fastboot *fastboot_func;
57 static unsigned int fastboot_flash_session_id;
58 static unsigned int download_size;
59 static unsigned int download_bytes;
60 static bool is_high_speed;
61 
62 static struct usb_endpoint_descriptor fs_ep_in = {
63 	.bLength            = USB_DT_ENDPOINT_SIZE,
64 	.bDescriptorType    = USB_DT_ENDPOINT,
65 	.bEndpointAddress   = USB_DIR_IN,
66 	.bmAttributes       = USB_ENDPOINT_XFER_BULK,
67 	.wMaxPacketSize     = TX_ENDPOINT_MAXIMUM_PACKET_SIZE,
68 	.bInterval          = 0x00,
69 };
70 
71 static struct usb_endpoint_descriptor fs_ep_out = {
72 	.bLength		= USB_DT_ENDPOINT_SIZE,
73 	.bDescriptorType	= USB_DT_ENDPOINT,
74 	.bEndpointAddress	= USB_DIR_OUT,
75 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
76 	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1,
77 	.bInterval		= 0x00,
78 };
79 
80 static struct usb_endpoint_descriptor hs_ep_out = {
81 	.bLength		= USB_DT_ENDPOINT_SIZE,
82 	.bDescriptorType	= USB_DT_ENDPOINT,
83 	.bEndpointAddress	= USB_DIR_OUT,
84 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
85 	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0,
86 	.bInterval		= 0x00,
87 };
88 
89 static struct usb_interface_descriptor interface_desc = {
90 	.bLength		= USB_DT_INTERFACE_SIZE,
91 	.bDescriptorType	= USB_DT_INTERFACE,
92 	.bInterfaceNumber	= 0x00,
93 	.bAlternateSetting	= 0x00,
94 	.bNumEndpoints		= 0x02,
95 	.bInterfaceClass	= FASTBOOT_INTERFACE_CLASS,
96 	.bInterfaceSubClass	= FASTBOOT_INTERFACE_SUB_CLASS,
97 	.bInterfaceProtocol	= FASTBOOT_INTERFACE_PROTOCOL,
98 };
99 
100 static struct usb_descriptor_header *fb_runtime_descs[] = {
101 	(struct usb_descriptor_header *)&interface_desc,
102 	(struct usb_descriptor_header *)&fs_ep_in,
103 	(struct usb_descriptor_header *)&hs_ep_out,
104 	NULL,
105 };
106 
107 /*
108  * static strings, in UTF-8
109  */
110 static const char fastboot_name[] = "Android Fastboot";
111 
112 static struct usb_string fastboot_string_defs[] = {
113 	[0].s = fastboot_name,
114 	{  }			/* end of list */
115 };
116 
117 static struct usb_gadget_strings stringtab_fastboot = {
118 	.language	= 0x0409,	/* en-us */
119 	.strings	= fastboot_string_defs,
120 };
121 
122 static struct usb_gadget_strings *fastboot_strings[] = {
123 	&stringtab_fastboot,
124 	NULL,
125 };
126 
127 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
128 static int strcmp_l1(const char *s1, const char *s2);
129 
130 
131 void fastboot_fail(char *response, const char *reason)
132 {
133 	strncpy(response, "FAIL\0", 5);
134 	strncat(response, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
135 }
136 
137 void fastboot_okay(char *response, const char *reason)
138 {
139 	strncpy(response, "OKAY\0", 5);
140 	strncat(response, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
141 }
142 
143 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
144 {
145 	int status = req->status;
146 	if (!status)
147 		return;
148 	printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
149 }
150 
151 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
152 {
153 	int id;
154 	struct usb_gadget *gadget = c->cdev->gadget;
155 	struct f_fastboot *f_fb = func_to_fastboot(f);
156 	const char *s;
157 
158 	/* DYNAMIC interface numbers assignments */
159 	id = usb_interface_id(c, f);
160 	if (id < 0)
161 		return id;
162 	interface_desc.bInterfaceNumber = id;
163 
164 	id = usb_string_id(c->cdev);
165 	if (id < 0)
166 		return id;
167 	fastboot_string_defs[0].id = id;
168 	interface_desc.iInterface = id;
169 
170 	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
171 	if (!f_fb->in_ep)
172 		return -ENODEV;
173 	f_fb->in_ep->driver_data = c->cdev;
174 
175 	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
176 	if (!f_fb->out_ep)
177 		return -ENODEV;
178 	f_fb->out_ep->driver_data = c->cdev;
179 
180 	hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
181 
182 	s = getenv("serial#");
183 	if (s)
184 		g_dnl_set_serialnumber((char *)s);
185 
186 	return 0;
187 }
188 
189 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
190 {
191 	memset(fastboot_func, 0, sizeof(*fastboot_func));
192 }
193 
194 static void fastboot_disable(struct usb_function *f)
195 {
196 	struct f_fastboot *f_fb = func_to_fastboot(f);
197 
198 	usb_ep_disable(f_fb->out_ep);
199 	usb_ep_disable(f_fb->in_ep);
200 
201 	if (f_fb->out_req) {
202 		free(f_fb->out_req->buf);
203 		usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
204 		f_fb->out_req = NULL;
205 	}
206 	if (f_fb->in_req) {
207 		free(f_fb->in_req->buf);
208 		usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
209 		f_fb->in_req = NULL;
210 	}
211 }
212 
213 static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
214 {
215 	struct usb_request *req;
216 
217 	req = usb_ep_alloc_request(ep, 0);
218 	if (!req)
219 		return NULL;
220 
221 	req->length = EP_BUFFER_SIZE;
222 	req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
223 	if (!req->buf) {
224 		usb_ep_free_request(ep, req);
225 		return NULL;
226 	}
227 
228 	memset(req->buf, 0, req->length);
229 	return req;
230 }
231 
232 static int fastboot_set_alt(struct usb_function *f,
233 			    unsigned interface, unsigned alt)
234 {
235 	int ret;
236 	struct usb_composite_dev *cdev = f->config->cdev;
237 	struct usb_gadget *gadget = cdev->gadget;
238 	struct f_fastboot *f_fb = func_to_fastboot(f);
239 
240 	debug("%s: func: %s intf: %d alt: %d\n",
241 	      __func__, f->name, interface, alt);
242 
243 	/* make sure we don't enable the ep twice */
244 	if (gadget->speed == USB_SPEED_HIGH) {
245 		ret = usb_ep_enable(f_fb->out_ep, &hs_ep_out);
246 		is_high_speed = true;
247 	} else {
248 		ret = usb_ep_enable(f_fb->out_ep, &fs_ep_out);
249 		is_high_speed = false;
250 	}
251 	if (ret) {
252 		puts("failed to enable out ep\n");
253 		return ret;
254 	}
255 
256 	f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
257 	if (!f_fb->out_req) {
258 		puts("failed to alloc out req\n");
259 		ret = -EINVAL;
260 		goto err;
261 	}
262 	f_fb->out_req->complete = rx_handler_command;
263 
264 	ret = usb_ep_enable(f_fb->in_ep, &fs_ep_in);
265 	if (ret) {
266 		puts("failed to enable in ep\n");
267 		goto err;
268 	}
269 
270 	f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
271 	if (!f_fb->in_req) {
272 		puts("failed alloc req in\n");
273 		ret = -EINVAL;
274 		goto err;
275 	}
276 	f_fb->in_req->complete = fastboot_complete;
277 
278 	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
279 	if (ret)
280 		goto err;
281 
282 	return 0;
283 err:
284 	fastboot_disable(f);
285 	return ret;
286 }
287 
288 static int fastboot_add(struct usb_configuration *c)
289 {
290 	struct f_fastboot *f_fb = fastboot_func;
291 	int status;
292 
293 	debug("%s: cdev: 0x%p\n", __func__, c->cdev);
294 
295 	if (!f_fb) {
296 		f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
297 		if (!f_fb)
298 			return -ENOMEM;
299 
300 		fastboot_func = f_fb;
301 		memset(f_fb, 0, sizeof(*f_fb));
302 	}
303 
304 	f_fb->usb_function.name = "f_fastboot";
305 	f_fb->usb_function.hs_descriptors = fb_runtime_descs;
306 	f_fb->usb_function.bind = fastboot_bind;
307 	f_fb->usb_function.unbind = fastboot_unbind;
308 	f_fb->usb_function.set_alt = fastboot_set_alt;
309 	f_fb->usb_function.disable = fastboot_disable;
310 	f_fb->usb_function.strings = fastboot_strings;
311 
312 	status = usb_add_function(c, &f_fb->usb_function);
313 	if (status) {
314 		free(f_fb);
315 		fastboot_func = f_fb;
316 	}
317 
318 	return status;
319 }
320 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
321 
322 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
323 {
324 	struct usb_request *in_req = fastboot_func->in_req;
325 	int ret;
326 
327 	memcpy(in_req->buf, buffer, buffer_size);
328 	in_req->length = buffer_size;
329 
330 	usb_ep_dequeue(fastboot_func->in_ep, in_req);
331 
332 	ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
333 	if (ret)
334 		printf("Error %d on queue\n", ret);
335 	return 0;
336 }
337 
338 static int fastboot_tx_write_str(const char *buffer)
339 {
340 	return fastboot_tx_write(buffer, strlen(buffer));
341 }
342 
343 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
344 {
345 	do_reset(NULL, 0, 0, NULL);
346 }
347 
348 int __weak fb_set_reboot_flag(void)
349 {
350 	return -ENOSYS;
351 }
352 
353 static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
354 {
355 	char *cmd = req->buf;
356 	if (!strcmp_l1("reboot-bootloader", cmd)) {
357 		if (fb_set_reboot_flag()) {
358 			fastboot_tx_write_str("FAILCannot set reboot flag");
359 			return;
360 		}
361 	}
362 	fastboot_func->in_req->complete = compl_do_reset;
363 	fastboot_tx_write_str("OKAY");
364 }
365 
366 static int strcmp_l1(const char *s1, const char *s2)
367 {
368 	if (!s1 || !s2)
369 		return -1;
370 	return strncmp(s1, s2, strlen(s1));
371 }
372 
373 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
374 {
375 	char *cmd = req->buf;
376 	char response[FASTBOOT_RESPONSE_LEN];
377 	const char *s;
378 	size_t chars_left;
379 
380 	strcpy(response, "OKAY");
381 	chars_left = sizeof(response) - strlen(response) - 1;
382 
383 	strsep(&cmd, ":");
384 	if (!cmd) {
385 		error("missing variable");
386 		fastboot_tx_write_str("FAILmissing var");
387 		return;
388 	}
389 
390 	if (!strcmp_l1("version", cmd)) {
391 		strncat(response, FASTBOOT_VERSION, chars_left);
392 	} else if (!strcmp_l1("bootloader-version", cmd)) {
393 		strncat(response, U_BOOT_VERSION, chars_left);
394 	} else if (!strcmp_l1("downloadsize", cmd) ||
395 		!strcmp_l1("max-download-size", cmd)) {
396 		char str_num[12];
397 
398 		sprintf(str_num, "0x%08x", CONFIG_FASTBOOT_BUF_SIZE);
399 		strncat(response, str_num, chars_left);
400 
401 		/*
402 		 * This also indicates the start of a new flashing
403 		 * "session", in which we could have 1-N buffers to
404 		 * write to a partition.
405 		 *
406 		 * Reset our session counter.
407 		 */
408 		fastboot_flash_session_id = 0;
409 	} else if (!strcmp_l1("serialno", cmd)) {
410 		s = getenv("serial#");
411 		if (s)
412 			strncat(response, s, chars_left);
413 		else
414 			strcpy(response, "FAILValue not set");
415 	} else {
416 		char envstr[32];
417 
418 		snprintf(envstr, sizeof(envstr) - 1, "fastboot.%s", cmd);
419 		s = getenv(envstr);
420 		if (s) {
421 			strncat(response, s, chars_left);
422 		} else {
423 			printf("WARNING: unknown variable: %s\n", cmd);
424 			strcpy(response, "FAILVariable not implemented");
425 		}
426 	}
427 	fastboot_tx_write_str(response);
428 }
429 
430 static unsigned int rx_bytes_expected(unsigned int maxpacket)
431 {
432 	int rx_remain = download_size - download_bytes;
433 	int rem = 0;
434 	if (rx_remain < 0)
435 		return 0;
436 	if (rx_remain > EP_BUFFER_SIZE)
437 		return EP_BUFFER_SIZE;
438 	if (rx_remain < maxpacket) {
439 		rx_remain = maxpacket;
440 	} else if (rx_remain % maxpacket != 0) {
441 		rem = rx_remain % maxpacket;
442 		rx_remain = rx_remain + (maxpacket - rem);
443 	}
444 	return rx_remain;
445 }
446 
447 #define BYTES_PER_DOT	0x20000
448 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
449 {
450 	char response[FASTBOOT_RESPONSE_LEN];
451 	unsigned int transfer_size = download_size - download_bytes;
452 	const unsigned char *buffer = req->buf;
453 	unsigned int buffer_size = req->actual;
454 	unsigned int pre_dot_num, now_dot_num;
455 	unsigned int max;
456 
457 	if (req->status != 0) {
458 		printf("Bad status: %d\n", req->status);
459 		return;
460 	}
461 
462 	if (buffer_size < transfer_size)
463 		transfer_size = buffer_size;
464 
465 	memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
466 	       buffer, transfer_size);
467 
468 	pre_dot_num = download_bytes / BYTES_PER_DOT;
469 	download_bytes += transfer_size;
470 	now_dot_num = download_bytes / BYTES_PER_DOT;
471 
472 	if (pre_dot_num != now_dot_num) {
473 		putc('.');
474 		if (!(now_dot_num % 74))
475 			putc('\n');
476 	}
477 
478 	/* Check if transfer is done */
479 	if (download_bytes >= download_size) {
480 		/*
481 		 * Reset global transfer variable, keep download_bytes because
482 		 * it will be used in the next possible flashing command
483 		 */
484 		download_size = 0;
485 		req->complete = rx_handler_command;
486 		req->length = EP_BUFFER_SIZE;
487 
488 		strcpy(response, "OKAY");
489 		fastboot_tx_write_str(response);
490 
491 		printf("\ndownloading of %d bytes finished\n", download_bytes);
492 	} else {
493 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
494 				fs_ep_out.wMaxPacketSize;
495 		req->length = rx_bytes_expected(max);
496 		if (req->length < ep->maxpacket)
497 			req->length = ep->maxpacket;
498 	}
499 
500 	req->actual = 0;
501 	usb_ep_queue(ep, req, 0);
502 }
503 
504 static void cb_download(struct usb_ep *ep, struct usb_request *req)
505 {
506 	char *cmd = req->buf;
507 	char response[FASTBOOT_RESPONSE_LEN];
508 	unsigned int max;
509 
510 	strsep(&cmd, ":");
511 	download_size = simple_strtoul(cmd, NULL, 16);
512 	download_bytes = 0;
513 
514 	printf("Starting download of %d bytes\n", download_size);
515 
516 	if (0 == download_size) {
517 		strcpy(response, "FAILdata invalid size");
518 	} else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
519 		download_size = 0;
520 		strcpy(response, "FAILdata too large");
521 	} else {
522 		sprintf(response, "DATA%08x", download_size);
523 		req->complete = rx_handler_dl_image;
524 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
525 			fs_ep_out.wMaxPacketSize;
526 		req->length = rx_bytes_expected(max);
527 		if (req->length < ep->maxpacket)
528 			req->length = ep->maxpacket;
529 	}
530 	fastboot_tx_write_str(response);
531 }
532 
533 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
534 {
535 	char boot_addr_start[12];
536 	char *bootm_args[] = { "bootm", boot_addr_start, NULL };
537 
538 	puts("Booting kernel..\n");
539 
540 	sprintf(boot_addr_start, "0x%lx", load_addr);
541 	do_bootm(NULL, 0, 2, bootm_args);
542 
543 	/* This only happens if image is somehow faulty so we start over */
544 	do_reset(NULL, 0, 0, NULL);
545 }
546 
547 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
548 {
549 	fastboot_func->in_req->complete = do_bootm_on_complete;
550 	fastboot_tx_write_str("OKAY");
551 }
552 
553 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
554 {
555 	g_dnl_trigger_detach();
556 }
557 
558 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
559 {
560 	fastboot_func->in_req->complete = do_exit_on_complete;
561 	fastboot_tx_write_str("OKAY");
562 }
563 
564 #ifdef CONFIG_FASTBOOT_FLASH
565 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
566 {
567 	char *cmd = req->buf;
568 	char response[FASTBOOT_RESPONSE_LEN];
569 
570 	strsep(&cmd, ":");
571 	if (!cmd) {
572 		error("missing partition name");
573 		fastboot_tx_write_str("FAILmissing partition name");
574 		return;
575 	}
576 
577 	strcpy(response, "FAILno flash device defined");
578 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
579 	fb_mmc_flash_write(cmd, fastboot_flash_session_id,
580 			   (void *)CONFIG_FASTBOOT_BUF_ADDR,
581 			   download_bytes, response);
582 #endif
583 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
584 	fb_nand_flash_write(cmd, fastboot_flash_session_id,
585 			    (void *)CONFIG_FASTBOOT_BUF_ADDR,
586 			    download_bytes, response);
587 #endif
588 	fastboot_flash_session_id++;
589 	fastboot_tx_write_str(response);
590 }
591 #endif
592 
593 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
594 {
595 	char *cmd = req->buf;
596 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
597 	if (strncmp("format", cmd + 4, 6) == 0) {
598 		char cmdbuf[32];
599                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
600 			CONFIG_FASTBOOT_FLASH_MMC_DEV);
601                 if (run_command(cmdbuf, 0))
602 			fastboot_tx_write_str("FAIL");
603                 else
604 			fastboot_tx_write_str("OKAY");
605 	} else
606 #endif
607 	if (strncmp("unlock", cmd + 4, 8) == 0) {
608 		fastboot_tx_write_str("FAILnot implemented");
609 	}
610 	else {
611 		fastboot_tx_write_str("FAILunknown oem command");
612 	}
613 }
614 
615 #ifdef CONFIG_FASTBOOT_FLASH
616 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
617 {
618 	char *cmd = req->buf;
619 	char response[FASTBOOT_RESPONSE_LEN];
620 
621 	strsep(&cmd, ":");
622 	if (!cmd) {
623 		error("missing partition name");
624 		fastboot_tx_write_str("FAILmissing partition name");
625 		return;
626 	}
627 
628 	strcpy(response, "FAILno flash device defined");
629 
630 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
631 	fb_mmc_erase(cmd, response);
632 #endif
633 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
634 	fb_nand_erase(cmd, response);
635 #endif
636 	fastboot_tx_write_str(response);
637 }
638 #endif
639 
640 struct cmd_dispatch_info {
641 	char *cmd;
642 	void (*cb)(struct usb_ep *ep, struct usb_request *req);
643 };
644 
645 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
646 	{
647 		.cmd = "reboot",
648 		.cb = cb_reboot,
649 	}, {
650 		.cmd = "getvar:",
651 		.cb = cb_getvar,
652 	}, {
653 		.cmd = "download:",
654 		.cb = cb_download,
655 	}, {
656 		.cmd = "boot",
657 		.cb = cb_boot,
658 	}, {
659 		.cmd = "continue",
660 		.cb = cb_continue,
661 	},
662 #ifdef CONFIG_FASTBOOT_FLASH
663 	{
664 		.cmd = "flash",
665 		.cb = cb_flash,
666 	}, {
667 		.cmd = "erase",
668 		.cb = cb_erase,
669 	},
670 #endif
671 	{
672 		.cmd = "oem",
673 		.cb = cb_oem,
674 	},
675 };
676 
677 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
678 {
679 	char *cmdbuf = req->buf;
680 	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
681 	int i;
682 
683 	if (req->status != 0 || req->length == 0)
684 		return;
685 
686 	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
687 		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
688 			func_cb = cmd_dispatch_info[i].cb;
689 			break;
690 		}
691 	}
692 
693 	if (!func_cb) {
694 		error("unknown command: %s", cmdbuf);
695 		fastboot_tx_write_str("FAILunknown command");
696 	} else {
697 		if (req->actual < req->length) {
698 			u8 *buf = (u8 *)req->buf;
699 			buf[req->actual] = 0;
700 			func_cb(ep, req);
701 		} else {
702 			error("buffer overflow");
703 			fastboot_tx_write_str("FAILbuffer overflow");
704 		}
705 	}
706 
707 	*cmdbuf = '\0';
708 	req->actual = 0;
709 	usb_ep_queue(ep, req, 0);
710 }
711