xref: /openbmc/u-boot/drivers/usb/gadget/f_fastboot.c (revision cb379a34) 
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\n");
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 		error("unknown variable: %s\n", cmd);
417 		strcpy(response, "FAILVariable not implemented");
418 	}
419 	fastboot_tx_write_str(response);
420 }
421 
422 static unsigned int rx_bytes_expected(unsigned int maxpacket)
423 {
424 	int rx_remain = download_size - download_bytes;
425 	int rem = 0;
426 	if (rx_remain < 0)
427 		return 0;
428 	if (rx_remain > EP_BUFFER_SIZE)
429 		return EP_BUFFER_SIZE;
430 	if (rx_remain < maxpacket) {
431 		rx_remain = maxpacket;
432 	} else if (rx_remain % maxpacket != 0) {
433 		rem = rx_remain % maxpacket;
434 		rx_remain = rx_remain + (maxpacket - rem);
435 	}
436 	return rx_remain;
437 }
438 
439 #define BYTES_PER_DOT	0x20000
440 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
441 {
442 	char response[FASTBOOT_RESPONSE_LEN];
443 	unsigned int transfer_size = download_size - download_bytes;
444 	const unsigned char *buffer = req->buf;
445 	unsigned int buffer_size = req->actual;
446 	unsigned int pre_dot_num, now_dot_num;
447 	unsigned int max;
448 
449 	if (req->status != 0) {
450 		printf("Bad status: %d\n", req->status);
451 		return;
452 	}
453 
454 	if (buffer_size < transfer_size)
455 		transfer_size = buffer_size;
456 
457 	memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
458 	       buffer, transfer_size);
459 
460 	pre_dot_num = download_bytes / BYTES_PER_DOT;
461 	download_bytes += transfer_size;
462 	now_dot_num = download_bytes / BYTES_PER_DOT;
463 
464 	if (pre_dot_num != now_dot_num) {
465 		putc('.');
466 		if (!(now_dot_num % 74))
467 			putc('\n');
468 	}
469 
470 	/* Check if transfer is done */
471 	if (download_bytes >= download_size) {
472 		/*
473 		 * Reset global transfer variable, keep download_bytes because
474 		 * it will be used in the next possible flashing command
475 		 */
476 		download_size = 0;
477 		req->complete = rx_handler_command;
478 		req->length = EP_BUFFER_SIZE;
479 
480 		sprintf(response, "OKAY");
481 		fastboot_tx_write_str(response);
482 
483 		printf("\ndownloading of %d bytes finished\n", download_bytes);
484 	} else {
485 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
486 				fs_ep_out.wMaxPacketSize;
487 		req->length = rx_bytes_expected(max);
488 		if (req->length < ep->maxpacket)
489 			req->length = ep->maxpacket;
490 	}
491 
492 	req->actual = 0;
493 	usb_ep_queue(ep, req, 0);
494 }
495 
496 static void cb_download(struct usb_ep *ep, struct usb_request *req)
497 {
498 	char *cmd = req->buf;
499 	char response[FASTBOOT_RESPONSE_LEN];
500 	unsigned int max;
501 
502 	strsep(&cmd, ":");
503 	download_size = simple_strtoul(cmd, NULL, 16);
504 	download_bytes = 0;
505 
506 	printf("Starting download of %d bytes\n", download_size);
507 
508 	if (0 == download_size) {
509 		sprintf(response, "FAILdata invalid size");
510 	} else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
511 		download_size = 0;
512 		sprintf(response, "FAILdata too large");
513 	} else {
514 		sprintf(response, "DATA%08x", download_size);
515 		req->complete = rx_handler_dl_image;
516 		max = is_high_speed ? hs_ep_out.wMaxPacketSize :
517 			fs_ep_out.wMaxPacketSize;
518 		req->length = rx_bytes_expected(max);
519 		if (req->length < ep->maxpacket)
520 			req->length = ep->maxpacket;
521 	}
522 	fastboot_tx_write_str(response);
523 }
524 
525 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
526 {
527 	char boot_addr_start[12];
528 	char *bootm_args[] = { "bootm", boot_addr_start, NULL };
529 
530 	puts("Booting kernel..\n");
531 
532 	sprintf(boot_addr_start, "0x%lx", load_addr);
533 	do_bootm(NULL, 0, 2, bootm_args);
534 
535 	/* This only happens if image is somehow faulty so we start over */
536 	do_reset(NULL, 0, 0, NULL);
537 }
538 
539 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
540 {
541 	fastboot_func->in_req->complete = do_bootm_on_complete;
542 	fastboot_tx_write_str("OKAY");
543 }
544 
545 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
546 {
547 	g_dnl_trigger_detach();
548 }
549 
550 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
551 {
552 	fastboot_func->in_req->complete = do_exit_on_complete;
553 	fastboot_tx_write_str("OKAY");
554 }
555 
556 #ifdef CONFIG_FASTBOOT_FLASH
557 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
558 {
559 	char *cmd = req->buf;
560 	char response[FASTBOOT_RESPONSE_LEN];
561 
562 	strsep(&cmd, ":");
563 	if (!cmd) {
564 		error("missing partition name\n");
565 		fastboot_tx_write_str("FAILmissing partition name");
566 		return;
567 	}
568 
569 	strcpy(response, "FAILno flash device defined");
570 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
571 	fb_mmc_flash_write(cmd, fastboot_flash_session_id,
572 			   (void *)CONFIG_FASTBOOT_BUF_ADDR,
573 			   download_bytes, response);
574 #endif
575 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
576 	fb_nand_flash_write(cmd, fastboot_flash_session_id,
577 			    (void *)CONFIG_FASTBOOT_BUF_ADDR,
578 			    download_bytes, response);
579 #endif
580 	fastboot_flash_session_id++;
581 	fastboot_tx_write_str(response);
582 }
583 #endif
584 
585 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
586 {
587 	char *cmd = req->buf;
588 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
589 	if (strncmp("format", cmd + 4, 6) == 0) {
590 		char cmdbuf[32];
591                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
592 			CONFIG_FASTBOOT_FLASH_MMC_DEV);
593                 if (run_command(cmdbuf, 0))
594 			fastboot_tx_write_str("FAIL");
595                 else
596 			fastboot_tx_write_str("OKAY");
597 	} else
598 #endif
599 	if (strncmp("unlock", cmd + 4, 8) == 0) {
600 		fastboot_tx_write_str("FAILnot implemented");
601 	}
602 	else {
603 		fastboot_tx_write_str("FAILunknown oem command");
604 	}
605 }
606 
607 #ifdef CONFIG_FASTBOOT_FLASH
608 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
609 {
610 	char *cmd = req->buf;
611 	char response[FASTBOOT_RESPONSE_LEN];
612 
613 	strsep(&cmd, ":");
614 	if (!cmd) {
615 		error("missing partition name");
616 		fastboot_tx_write_str("FAILmissing partition name");
617 		return;
618 	}
619 
620 	strcpy(response, "FAILno flash device defined");
621 
622 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
623 	fb_mmc_erase(cmd, response);
624 #endif
625 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
626 	fb_nand_erase(cmd, response);
627 #endif
628 	fastboot_tx_write_str(response);
629 }
630 #endif
631 
632 struct cmd_dispatch_info {
633 	char *cmd;
634 	void (*cb)(struct usb_ep *ep, struct usb_request *req);
635 };
636 
637 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
638 	{
639 		.cmd = "reboot",
640 		.cb = cb_reboot,
641 	}, {
642 		.cmd = "getvar:",
643 		.cb = cb_getvar,
644 	}, {
645 		.cmd = "download:",
646 		.cb = cb_download,
647 	}, {
648 		.cmd = "boot",
649 		.cb = cb_boot,
650 	}, {
651 		.cmd = "continue",
652 		.cb = cb_continue,
653 	},
654 #ifdef CONFIG_FASTBOOT_FLASH
655 	{
656 		.cmd = "flash",
657 		.cb = cb_flash,
658 	}, {
659 		.cmd = "erase",
660 		.cb = cb_erase,
661 	},
662 #endif
663 	{
664 		.cmd = "oem",
665 		.cb = cb_oem,
666 	},
667 };
668 
669 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
670 {
671 	char *cmdbuf = req->buf;
672 	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
673 	int i;
674 
675 	if (req->status != 0 || req->length == 0)
676 		return;
677 
678 	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
679 		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
680 			func_cb = cmd_dispatch_info[i].cb;
681 			break;
682 		}
683 	}
684 
685 	if (!func_cb) {
686 		error("unknown command: %s\n", cmdbuf);
687 		fastboot_tx_write_str("FAILunknown command");
688 	} else {
689 		if (req->actual < req->length) {
690 			u8 *buf = (u8 *)req->buf;
691 			buf[req->actual] = 0;
692 			func_cb(ep, req);
693 		} else {
694 			error("buffer overflow\n");
695 			fastboot_tx_write_str("FAILbuffer overflow");
696 		}
697 	}
698 
699 	*cmdbuf = '\0';
700 	req->actual = 0;
701 	usb_ep_queue(ep, req, 0);
702 }
703