xref: /openbmc/u-boot/drivers/usb/gadget/f_fastboot.c (revision fbe502e9) 
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2008 - 2009
4  * Windriver, <www.windriver.com>
5  * Tom Rix <Tom.Rix@windriver.com>
6  *
7  * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8  *
9  * Copyright 2014 Linaro, Ltd.
10  * Rob Herring <robh@kernel.org>
11  */
12 #include <config.h>
13 #include <common.h>
14 #include <errno.h>
15 #include <fastboot.h>
16 #include <malloc.h>
17 #include <linux/usb/ch9.h>
18 #include <linux/usb/gadget.h>
19 #include <linux/usb/composite.h>
20 #include <linux/compiler.h>
21 #include <version.h>
22 #include <g_dnl.h>
23 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
24 #include <fb_mmc.h>
25 #endif
26 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
27 #include <fb_nand.h>
28 #endif
29 
30 #define FASTBOOT_VERSION		"0.4"
31 
32 #define FASTBOOT_INTERFACE_CLASS	0xff
33 #define FASTBOOT_INTERFACE_SUB_CLASS	0x42
34 #define FASTBOOT_INTERFACE_PROTOCOL	0x03
35 
36 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
37 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
38 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
39 
40 #define EP_BUFFER_SIZE			4096
41 /*
42  * EP_BUFFER_SIZE must always be an integral multiple of maxpacket size
43  * (64 or 512 or 1024), else we break on certain controllers like DWC3
44  * that expect bulk OUT requests to be divisible by maxpacket size.
45  */
46 
47 struct f_fastboot {
48 	struct usb_function usb_function;
49 
50 	/* IN/OUT EP's and corresponding requests */
51 	struct usb_ep *in_ep, *out_ep;
52 	struct usb_request *in_req, *out_req;
53 };
54 
55 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
56 {
57 	return container_of(f, struct f_fastboot, usb_function);
58 }
59 
60 static struct f_fastboot *fastboot_func;
61 static unsigned int download_size;
62 static unsigned int download_bytes;
63 
64 static struct usb_endpoint_descriptor fs_ep_in = {
65 	.bLength            = USB_DT_ENDPOINT_SIZE,
66 	.bDescriptorType    = USB_DT_ENDPOINT,
67 	.bEndpointAddress   = USB_DIR_IN,
68 	.bmAttributes       = USB_ENDPOINT_XFER_BULK,
69 	.wMaxPacketSize     = cpu_to_le16(64),
70 };
71 
72 static struct usb_endpoint_descriptor fs_ep_out = {
73 	.bLength		= USB_DT_ENDPOINT_SIZE,
74 	.bDescriptorType	= USB_DT_ENDPOINT,
75 	.bEndpointAddress	= USB_DIR_OUT,
76 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
77 	.wMaxPacketSize		= cpu_to_le16(64),
78 };
79 
80 static struct usb_endpoint_descriptor hs_ep_in = {
81 	.bLength		= USB_DT_ENDPOINT_SIZE,
82 	.bDescriptorType	= USB_DT_ENDPOINT,
83 	.bEndpointAddress	= USB_DIR_IN,
84 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
85 	.wMaxPacketSize		= cpu_to_le16(512),
86 };
87 
88 static struct usb_endpoint_descriptor hs_ep_out = {
89 	.bLength		= USB_DT_ENDPOINT_SIZE,
90 	.bDescriptorType	= USB_DT_ENDPOINT,
91 	.bEndpointAddress	= USB_DIR_OUT,
92 	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
93 	.wMaxPacketSize		= cpu_to_le16(512),
94 };
95 
96 static struct usb_interface_descriptor interface_desc = {
97 	.bLength		= USB_DT_INTERFACE_SIZE,
98 	.bDescriptorType	= USB_DT_INTERFACE,
99 	.bInterfaceNumber	= 0x00,
100 	.bAlternateSetting	= 0x00,
101 	.bNumEndpoints		= 0x02,
102 	.bInterfaceClass	= FASTBOOT_INTERFACE_CLASS,
103 	.bInterfaceSubClass	= FASTBOOT_INTERFACE_SUB_CLASS,
104 	.bInterfaceProtocol	= FASTBOOT_INTERFACE_PROTOCOL,
105 };
106 
107 static struct usb_descriptor_header *fb_fs_function[] = {
108 	(struct usb_descriptor_header *)&interface_desc,
109 	(struct usb_descriptor_header *)&fs_ep_in,
110 	(struct usb_descriptor_header *)&fs_ep_out,
111 };
112 
113 static struct usb_descriptor_header *fb_hs_function[] = {
114 	(struct usb_descriptor_header *)&interface_desc,
115 	(struct usb_descriptor_header *)&hs_ep_in,
116 	(struct usb_descriptor_header *)&hs_ep_out,
117 	NULL,
118 };
119 
120 static struct usb_endpoint_descriptor *
121 fb_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
122 	    struct usb_endpoint_descriptor *hs)
123 {
124 	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
125 		return hs;
126 	return fs;
127 }
128 
129 /*
130  * static strings, in UTF-8
131  */
132 static const char fastboot_name[] = "Android Fastboot";
133 
134 static struct usb_string fastboot_string_defs[] = {
135 	[0].s = fastboot_name,
136 	{  }			/* end of list */
137 };
138 
139 static struct usb_gadget_strings stringtab_fastboot = {
140 	.language	= 0x0409,	/* en-us */
141 	.strings	= fastboot_string_defs,
142 };
143 
144 static struct usb_gadget_strings *fastboot_strings[] = {
145 	&stringtab_fastboot,
146 	NULL,
147 };
148 
149 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
150 static int strcmp_l1(const char *s1, const char *s2);
151 
152 
153 static char *fb_response_str;
154 
155 void fastboot_fail(const char *reason)
156 {
157 	strncpy(fb_response_str, "FAIL\0", 5);
158 	strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
159 }
160 
161 void fastboot_okay(const char *reason)
162 {
163 	strncpy(fb_response_str, "OKAY\0", 5);
164 	strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
165 }
166 
167 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
168 {
169 	int status = req->status;
170 	if (!status)
171 		return;
172 	printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
173 }
174 
175 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
176 {
177 	int id;
178 	struct usb_gadget *gadget = c->cdev->gadget;
179 	struct f_fastboot *f_fb = func_to_fastboot(f);
180 	const char *s;
181 
182 	/* DYNAMIC interface numbers assignments */
183 	id = usb_interface_id(c, f);
184 	if (id < 0)
185 		return id;
186 	interface_desc.bInterfaceNumber = id;
187 
188 	id = usb_string_id(c->cdev);
189 	if (id < 0)
190 		return id;
191 	fastboot_string_defs[0].id = id;
192 	interface_desc.iInterface = id;
193 
194 	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
195 	if (!f_fb->in_ep)
196 		return -ENODEV;
197 	f_fb->in_ep->driver_data = c->cdev;
198 
199 	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
200 	if (!f_fb->out_ep)
201 		return -ENODEV;
202 	f_fb->out_ep->driver_data = c->cdev;
203 
204 	f->descriptors = fb_fs_function;
205 
206 	if (gadget_is_dualspeed(gadget)) {
207 		/* Assume endpoint addresses are the same for both speeds */
208 		hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress;
209 		hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
210 		/* copy HS descriptors */
211 		f->hs_descriptors = fb_hs_function;
212 	}
213 
214 	s = env_get("serial#");
215 	if (s)
216 		g_dnl_set_serialnumber((char *)s);
217 
218 	return 0;
219 }
220 
221 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
222 {
223 	memset(fastboot_func, 0, sizeof(*fastboot_func));
224 }
225 
226 static void fastboot_disable(struct usb_function *f)
227 {
228 	struct f_fastboot *f_fb = func_to_fastboot(f);
229 
230 	usb_ep_disable(f_fb->out_ep);
231 	usb_ep_disable(f_fb->in_ep);
232 
233 	if (f_fb->out_req) {
234 		free(f_fb->out_req->buf);
235 		usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
236 		f_fb->out_req = NULL;
237 	}
238 	if (f_fb->in_req) {
239 		free(f_fb->in_req->buf);
240 		usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
241 		f_fb->in_req = NULL;
242 	}
243 }
244 
245 static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
246 {
247 	struct usb_request *req;
248 
249 	req = usb_ep_alloc_request(ep, 0);
250 	if (!req)
251 		return NULL;
252 
253 	req->length = EP_BUFFER_SIZE;
254 	req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
255 	if (!req->buf) {
256 		usb_ep_free_request(ep, req);
257 		return NULL;
258 	}
259 
260 	memset(req->buf, 0, req->length);
261 	return req;
262 }
263 
264 static int fastboot_set_alt(struct usb_function *f,
265 			    unsigned interface, unsigned alt)
266 {
267 	int ret;
268 	struct usb_composite_dev *cdev = f->config->cdev;
269 	struct usb_gadget *gadget = cdev->gadget;
270 	struct f_fastboot *f_fb = func_to_fastboot(f);
271 	const struct usb_endpoint_descriptor *d;
272 
273 	debug("%s: func: %s intf: %d alt: %d\n",
274 	      __func__, f->name, interface, alt);
275 
276 	d = fb_ep_desc(gadget, &fs_ep_out, &hs_ep_out);
277 	ret = usb_ep_enable(f_fb->out_ep, d);
278 	if (ret) {
279 		puts("failed to enable out ep\n");
280 		return ret;
281 	}
282 
283 	f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
284 	if (!f_fb->out_req) {
285 		puts("failed to alloc out req\n");
286 		ret = -EINVAL;
287 		goto err;
288 	}
289 	f_fb->out_req->complete = rx_handler_command;
290 
291 	d = fb_ep_desc(gadget, &fs_ep_in, &hs_ep_in);
292 	ret = usb_ep_enable(f_fb->in_ep, d);
293 	if (ret) {
294 		puts("failed to enable in ep\n");
295 		goto err;
296 	}
297 
298 	f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
299 	if (!f_fb->in_req) {
300 		puts("failed alloc req in\n");
301 		ret = -EINVAL;
302 		goto err;
303 	}
304 	f_fb->in_req->complete = fastboot_complete;
305 
306 	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
307 	if (ret)
308 		goto err;
309 
310 	return 0;
311 err:
312 	fastboot_disable(f);
313 	return ret;
314 }
315 
316 static int fastboot_add(struct usb_configuration *c)
317 {
318 	struct f_fastboot *f_fb = fastboot_func;
319 	int status;
320 
321 	debug("%s: cdev: 0x%p\n", __func__, c->cdev);
322 
323 	if (!f_fb) {
324 		f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
325 		if (!f_fb)
326 			return -ENOMEM;
327 
328 		fastboot_func = f_fb;
329 		memset(f_fb, 0, sizeof(*f_fb));
330 	}
331 
332 	f_fb->usb_function.name = "f_fastboot";
333 	f_fb->usb_function.bind = fastboot_bind;
334 	f_fb->usb_function.unbind = fastboot_unbind;
335 	f_fb->usb_function.set_alt = fastboot_set_alt;
336 	f_fb->usb_function.disable = fastboot_disable;
337 	f_fb->usb_function.strings = fastboot_strings;
338 
339 	status = usb_add_function(c, &f_fb->usb_function);
340 	if (status) {
341 		free(f_fb);
342 		fastboot_func = f_fb;
343 	}
344 
345 	return status;
346 }
347 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
348 
349 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
350 {
351 	struct usb_request *in_req = fastboot_func->in_req;
352 	int ret;
353 
354 	memcpy(in_req->buf, buffer, buffer_size);
355 	in_req->length = buffer_size;
356 
357 	usb_ep_dequeue(fastboot_func->in_ep, in_req);
358 
359 	ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
360 	if (ret)
361 		printf("Error %d on queue\n", ret);
362 	return 0;
363 }
364 
365 static int fastboot_tx_write_str(const char *buffer)
366 {
367 	return fastboot_tx_write(buffer, strlen(buffer));
368 }
369 
370 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
371 {
372 	do_reset(NULL, 0, 0, NULL);
373 }
374 
375 int __weak fb_set_reboot_flag(void)
376 {
377 	return -ENOSYS;
378 }
379 
380 static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
381 {
382 	char *cmd = req->buf;
383 	if (!strcmp_l1("reboot-bootloader", cmd)) {
384 		if (fb_set_reboot_flag()) {
385 			fastboot_tx_write_str("FAILCannot set reboot flag");
386 			return;
387 		}
388 	}
389 	fastboot_func->in_req->complete = compl_do_reset;
390 	fastboot_tx_write_str("OKAY");
391 }
392 
393 static int strcmp_l1(const char *s1, const char *s2)
394 {
395 	if (!s1 || !s2)
396 		return -1;
397 	return strncmp(s1, s2, strlen(s1));
398 }
399 
400 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
401 {
402 	char *cmd = req->buf;
403 	char response[FASTBOOT_RESPONSE_LEN];
404 	const char *s;
405 	size_t chars_left;
406 
407 	strcpy(response, "OKAY");
408 	chars_left = sizeof(response) - strlen(response) - 1;
409 
410 	strsep(&cmd, ":");
411 	if (!cmd) {
412 		pr_err("missing variable");
413 		fastboot_tx_write_str("FAILmissing var");
414 		return;
415 	}
416 
417 	if (!strcmp_l1("version", cmd)) {
418 		strncat(response, FASTBOOT_VERSION, chars_left);
419 	} else if (!strcmp_l1("bootloader-version", cmd)) {
420 		strncat(response, U_BOOT_VERSION, chars_left);
421 	} else if (!strcmp_l1("downloadsize", cmd) ||
422 		!strcmp_l1("max-download-size", cmd)) {
423 		char str_num[12];
424 
425 		sprintf(str_num, "0x%08x", CONFIG_FASTBOOT_BUF_SIZE);
426 		strncat(response, str_num, chars_left);
427 	} else if (!strcmp_l1("serialno", cmd)) {
428 		s = env_get("serial#");
429 		if (s)
430 			strncat(response, s, chars_left);
431 		else
432 			strcpy(response, "FAILValue not set");
433 	} else {
434 		char *envstr;
435 
436 		envstr = malloc(strlen("fastboot.") + strlen(cmd) + 1);
437 		if (!envstr) {
438 			fastboot_tx_write_str("FAILmalloc error");
439 			return;
440 		}
441 
442 		sprintf(envstr, "fastboot.%s", cmd);
443 		s = env_get(envstr);
444 		if (s) {
445 			strncat(response, s, chars_left);
446 		} else {
447 			printf("WARNING: unknown variable: %s\n", cmd);
448 			strcpy(response, "FAILVariable not implemented");
449 		}
450 
451 		free(envstr);
452 	}
453 	fastboot_tx_write_str(response);
454 }
455 
456 static unsigned int rx_bytes_expected(struct usb_ep *ep)
457 {
458 	int rx_remain = download_size - download_bytes;
459 	unsigned int rem;
460 	unsigned int maxpacket = ep->maxpacket;
461 
462 	if (rx_remain <= 0)
463 		return 0;
464 	else if (rx_remain > EP_BUFFER_SIZE)
465 		return EP_BUFFER_SIZE;
466 
467 	/*
468 	 * Some controllers e.g. DWC3 don't like OUT transfers to be
469 	 * not ending in maxpacket boundary. So just make them happy by
470 	 * always requesting for integral multiple of maxpackets.
471 	 * This shouldn't bother controllers that don't care about it.
472 	 */
473 	rem = rx_remain % maxpacket;
474 	if (rem > 0)
475 		rx_remain = rx_remain + (maxpacket - rem);
476 
477 	return rx_remain;
478 }
479 
480 #define BYTES_PER_DOT	0x20000
481 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
482 {
483 	char response[FASTBOOT_RESPONSE_LEN];
484 	unsigned int transfer_size = download_size - download_bytes;
485 	const unsigned char *buffer = req->buf;
486 	unsigned int buffer_size = req->actual;
487 	unsigned int pre_dot_num, now_dot_num;
488 
489 	if (req->status != 0) {
490 		printf("Bad status: %d\n", req->status);
491 		return;
492 	}
493 
494 	if (buffer_size < transfer_size)
495 		transfer_size = buffer_size;
496 
497 	memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
498 	       buffer, transfer_size);
499 
500 	pre_dot_num = download_bytes / BYTES_PER_DOT;
501 	download_bytes += transfer_size;
502 	now_dot_num = download_bytes / BYTES_PER_DOT;
503 
504 	if (pre_dot_num != now_dot_num) {
505 		putc('.');
506 		if (!(now_dot_num % 74))
507 			putc('\n');
508 	}
509 
510 	/* Check if transfer is done */
511 	if (download_bytes >= download_size) {
512 		/*
513 		 * Reset global transfer variable, keep download_bytes because
514 		 * it will be used in the next possible flashing command
515 		 */
516 		download_size = 0;
517 		req->complete = rx_handler_command;
518 		req->length = EP_BUFFER_SIZE;
519 
520 		strcpy(response, "OKAY");
521 		fastboot_tx_write_str(response);
522 
523 		printf("\ndownloading of %d bytes finished\n", download_bytes);
524 	} else {
525 		req->length = rx_bytes_expected(ep);
526 	}
527 
528 	req->actual = 0;
529 	usb_ep_queue(ep, req, 0);
530 }
531 
532 static void cb_download(struct usb_ep *ep, struct usb_request *req)
533 {
534 	char *cmd = req->buf;
535 	char response[FASTBOOT_RESPONSE_LEN];
536 
537 	strsep(&cmd, ":");
538 	download_size = simple_strtoul(cmd, NULL, 16);
539 	download_bytes = 0;
540 
541 	printf("Starting download of %d bytes\n", download_size);
542 
543 	if (0 == download_size) {
544 		strcpy(response, "FAILdata invalid size");
545 	} else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
546 		download_size = 0;
547 		strcpy(response, "FAILdata too large");
548 	} else {
549 		sprintf(response, "DATA%08x", download_size);
550 		req->complete = rx_handler_dl_image;
551 		req->length = rx_bytes_expected(ep);
552 	}
553 	fastboot_tx_write_str(response);
554 }
555 
556 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
557 {
558 	char boot_addr_start[12];
559 	char *bootm_args[] = { "bootm", boot_addr_start, NULL };
560 
561 	puts("Booting kernel..\n");
562 
563 	sprintf(boot_addr_start, "0x%lx", (long)CONFIG_FASTBOOT_BUF_ADDR);
564 	do_bootm(NULL, 0, 2, bootm_args);
565 
566 	/* This only happens if image is somehow faulty so we start over */
567 	do_reset(NULL, 0, 0, NULL);
568 }
569 
570 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
571 {
572 	fastboot_func->in_req->complete = do_bootm_on_complete;
573 	fastboot_tx_write_str("OKAY");
574 }
575 
576 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
577 {
578 	g_dnl_trigger_detach();
579 }
580 
581 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
582 {
583 	fastboot_func->in_req->complete = do_exit_on_complete;
584 	fastboot_tx_write_str("OKAY");
585 }
586 
587 #ifdef CONFIG_FASTBOOT_FLASH
588 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
589 {
590 	char *cmd = req->buf;
591 	char response[FASTBOOT_RESPONSE_LEN];
592 
593 	strsep(&cmd, ":");
594 	if (!cmd) {
595 		pr_err("missing partition name");
596 		fastboot_tx_write_str("FAILmissing partition name");
597 		return;
598 	}
599 
600 	/* initialize the response buffer */
601 	fb_response_str = response;
602 
603 	fastboot_fail("no flash device defined");
604 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
605 	fb_mmc_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR,
606 			   download_bytes);
607 #endif
608 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
609 	fb_nand_flash_write(cmd,
610 			    (void *)CONFIG_FASTBOOT_BUF_ADDR,
611 			    download_bytes);
612 #endif
613 	fastboot_tx_write_str(response);
614 }
615 #endif
616 
617 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
618 {
619 	char *cmd = req->buf;
620 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
621 	if (strncmp("format", cmd + 4, 6) == 0) {
622 		char cmdbuf[32];
623                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
624 			CONFIG_FASTBOOT_FLASH_MMC_DEV);
625                 if (run_command(cmdbuf, 0))
626 			fastboot_tx_write_str("FAIL");
627                 else
628 			fastboot_tx_write_str("OKAY");
629 	} else
630 #endif
631 	if (strncmp("unlock", cmd + 4, 8) == 0) {
632 		fastboot_tx_write_str("FAILnot implemented");
633 	}
634 	else {
635 		fastboot_tx_write_str("FAILunknown oem command");
636 	}
637 }
638 
639 #ifdef CONFIG_FASTBOOT_FLASH
640 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
641 {
642 	char *cmd = req->buf;
643 	char response[FASTBOOT_RESPONSE_LEN];
644 
645 	strsep(&cmd, ":");
646 	if (!cmd) {
647 		pr_err("missing partition name");
648 		fastboot_tx_write_str("FAILmissing partition name");
649 		return;
650 	}
651 
652 	/* initialize the response buffer */
653 	fb_response_str = response;
654 
655 	fastboot_fail("no flash device defined");
656 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
657 	fb_mmc_erase(cmd);
658 #endif
659 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
660 	fb_nand_erase(cmd);
661 #endif
662 	fastboot_tx_write_str(response);
663 }
664 #endif
665 
666 struct cmd_dispatch_info {
667 	char *cmd;
668 	void (*cb)(struct usb_ep *ep, struct usb_request *req);
669 };
670 
671 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
672 	{
673 		.cmd = "reboot",
674 		.cb = cb_reboot,
675 	}, {
676 		.cmd = "getvar:",
677 		.cb = cb_getvar,
678 	}, {
679 		.cmd = "download:",
680 		.cb = cb_download,
681 	}, {
682 		.cmd = "boot",
683 		.cb = cb_boot,
684 	}, {
685 		.cmd = "continue",
686 		.cb = cb_continue,
687 	},
688 #ifdef CONFIG_FASTBOOT_FLASH
689 	{
690 		.cmd = "flash",
691 		.cb = cb_flash,
692 	}, {
693 		.cmd = "erase",
694 		.cb = cb_erase,
695 	},
696 #endif
697 	{
698 		.cmd = "oem",
699 		.cb = cb_oem,
700 	},
701 };
702 
703 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
704 {
705 	char *cmdbuf = req->buf;
706 	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
707 	int i;
708 
709 	if (req->status != 0 || req->length == 0)
710 		return;
711 
712 	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
713 		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
714 			func_cb = cmd_dispatch_info[i].cb;
715 			break;
716 		}
717 	}
718 
719 	if (!func_cb) {
720 		pr_err("unknown command: %.*s", req->actual, cmdbuf);
721 		fastboot_tx_write_str("FAILunknown command");
722 	} else {
723 		if (req->actual < req->length) {
724 			u8 *buf = (u8 *)req->buf;
725 			buf[req->actual] = 0;
726 			func_cb(ep, req);
727 		} else {
728 			pr_err("buffer overflow");
729 			fastboot_tx_write_str("FAILbuffer overflow");
730 		}
731 	}
732 
733 	*cmdbuf = '\0';
734 	req->actual = 0;
735 	usb_ep_queue(ep, req, 0);
736 }
737