drivers/dfu/dfu.c - github/trini/u-boot - Gitiles

 /*
  * dfu.c -- DFU back-end routines
  *
  * Copyright (C) 2012 Samsung Electronics
  * author: Lukasz Majewski <l.majewski@samsung.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <errno.h>
 #include <malloc.h>
 #include <mmc.h>
 #include <fat.h>
 #include <dfu.h>
 #include <hash.h>
 #include <linux/list.h>
 #include <linux/compiler.h>

 static bool dfu_reset_request;
 static LIST_HEAD(dfu_list);
 static int dfu_alt_num;
 static int alt_num_cnt;
 static struct hash_algo *dfu_hash_algo;

 bool dfu_reset(void)
 {
 	return dfu_reset_request;
 }

 void dfu_trigger_reset()
 {
 	dfu_reset_request = true;
 }

 static int dfu_find_alt_num(const char *s)
 {
 	int i = 0;

 	for (; *s; s++)
 		if (*s == ';')
 			i++;

 	return ++i;
 }

 int dfu_init_env_entities(char *interface, char *devstr)
 {
 	const char *str_env;
 	char *env_bkp;
 	int ret;

 	str_env = getenv("dfu_alt_info");
 	if (!str_env) {
 		error("\"dfu_alt_info\" env variable not defined!\n");
 		return -EINVAL;
 	}

 	env_bkp = strdup(str_env);
 	ret = dfu_config_entities(env_bkp, interface, devstr);
 	if (ret) {
 		error("DFU entities configuration failed!\n");
 		return ret;
 	}

 	free(env_bkp);
 	return 0;
 }

 static unsigned char *dfu_buf;
 static unsigned long dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;

 unsigned char *dfu_free_buf(void)
 {
 	free(dfu_buf);
 	dfu_buf = NULL;
 	return dfu_buf;
 }

 unsigned long dfu_get_buf_size(void)
 {
 	return dfu_buf_size;
 }

 unsigned char *dfu_get_buf(struct dfu_entity *dfu)
 {
 	char *s;

 	if (dfu_buf != NULL)
 		return dfu_buf;

 	s = getenv("dfu_bufsiz");
 	dfu_buf_size = s ? (unsigned long)simple_strtol(s, NULL, 16) :
 			CONFIG_SYS_DFU_DATA_BUF_SIZE;
 	if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
 		dfu_buf_size = dfu->max_buf_size;

 	dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
 	if (dfu_buf == NULL)
 		printf("%s: Could not memalign 0x%lx bytes\n",
 		       __func__, dfu_buf_size);

 	return dfu_buf;
 }

 static char *dfu_get_hash_algo(void)
 {
 	char *s;

 	s = getenv("dfu_hash_algo");
 	if (!s)
 		return NULL;

 	if (!strcmp(s, "crc32")) {
 		debug("%s: DFU hash method: %s\n", __func__, s);
 		return s;
 	}

 	error("DFU hash method: %s not supported!\n", s);
 	return NULL;
 }

 static int dfu_write_buffer_drain(struct dfu_entity *dfu)
 {
 	long w_size;
 	int ret;

 	/* flush size? */
 	w_size = dfu->i_buf - dfu->i_buf_start;
 	if (w_size == 0)
 		return 0;

 	if (dfu_hash_algo)
 		dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
 					   dfu->i_buf_start, w_size, 0);

 	ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
 	if (ret)
 		debug("%s: Write error!\n", __func__);

 	/* point back */
 	dfu->i_buf = dfu->i_buf_start;

 	/* update offset */
 	dfu->offset += w_size;

 	puts("#");

 	return ret;
 }

 void dfu_write_transaction_cleanup(struct dfu_entity *dfu)
 {
 	/* clear everything */
 	dfu_free_buf();
 	dfu->crc = 0;
 	dfu->offset = 0;
 	dfu->i_blk_seq_num = 0;
 	dfu->i_buf_start = dfu_buf;
 	dfu->i_buf_end = dfu_buf;
 	dfu->i_buf = dfu->i_buf_start;
 	dfu->inited = 0;
 }

 int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 {
 	int ret = 0;

 	ret = dfu_write_buffer_drain(dfu);
 	if (ret)
 		return ret;

 	if (dfu->flush_medium)
 		ret = dfu->flush_medium(dfu);

 	if (dfu_hash_algo)
 		printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
 		       dfu->crc);

 	dfu_write_transaction_cleanup(dfu);

 	return ret;
 }

 int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 {
 	int ret;

 	debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n",
 	      __func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
 	      dfu->i_buf - dfu->i_buf_start);

 	if (!dfu->inited) {
 		/* initial state */
 		dfu->crc = 0;
 		dfu->offset = 0;
 		dfu->bad_skip = 0;
 		dfu->i_blk_seq_num = 0;
 		dfu->i_buf_start = dfu_get_buf(dfu);
 		if (dfu->i_buf_start == NULL)
 			return -ENOMEM;
 		dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 		dfu->i_buf = dfu->i_buf_start;

 		dfu->inited = 1;
 	}

 	if (dfu->i_blk_seq_num != blk_seq_num) {
 		printf("%s: Wrong sequence number! [%d] [%d]\n",
 		       __func__, dfu->i_blk_seq_num, blk_seq_num);
 		dfu_write_transaction_cleanup(dfu);
 		return -1;
 	}

 	/* DFU 1.1 standard says:
 	 * The wBlockNum field is a block sequence number. It increments each
 	 * time a block is transferred, wrapping to zero from 65,535. It is used
 	 * to provide useful context to the DFU loader in the device."
 	 *
 	 * This means that it's a 16 bit counter that roll-overs at
 	 * 0xffff -> 0x0000. By having a typical 4K transfer block
 	 * we roll-over at exactly 256MB. Not very fun to debug.
 	 *
 	 * Handling rollover, and having an inited variable,
 	 * makes things work.
 	 */

 	/* handle rollover */
 	dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;

 	/* flush buffer if overflow */
 	if ((dfu->i_buf + size) > dfu->i_buf_end) {
 		ret = dfu_write_buffer_drain(dfu);
 		if (ret) {
 			dfu_write_transaction_cleanup(dfu);
 			return ret;
 		}
 	}

 	/* we should be in buffer now (if not then size too large) */
 	if ((dfu->i_buf + size) > dfu->i_buf_end) {
 		error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 		      size, dfu->i_buf_end);
 		dfu_write_transaction_cleanup(dfu);
 		return -1;
 	}

 	memcpy(dfu->i_buf, buf, size);
 	dfu->i_buf += size;

 	/* if end or if buffer full flush */
 	if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
 		ret = dfu_write_buffer_drain(dfu);
 		if (ret) {
 			dfu_write_transaction_cleanup(dfu);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
 {
 	long chunk;
 	int ret, readn;

 	readn = 0;
 	while (size > 0) {
 		/* get chunk that can be read */
 		chunk = min(size, dfu->b_left);
 		/* consume */
 		if (chunk > 0) {
 			memcpy(buf, dfu->i_buf, chunk);
 			if (dfu_hash_algo)
 				dfu_hash_algo->hash_update(dfu_hash_algo,
 							   &dfu->crc, buf,
 							   chunk, 0);

 			dfu->i_buf += chunk;
 			dfu->b_left -= chunk;
 			size -= chunk;
 			buf += chunk;
 			readn += chunk;
 		}

 		/* all done */
 		if (size > 0) {
 			/* no more to read */
 			if (dfu->r_left == 0)
 				break;

 			dfu->i_buf = dfu->i_buf_start;
 			dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;

 			/* got to read, but buffer is empty */
 			if (dfu->b_left > dfu->r_left)
 				dfu->b_left = dfu->r_left;
 			ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
 					&dfu->b_left);
 			if (ret != 0) {
 				debug("%s: Read error!\n", __func__);
 				return ret;
 			}
 			dfu->offset += dfu->b_left;
 			dfu->r_left -= dfu->b_left;

 			puts("#");
 		}
 	}

 	return readn;
 }

 int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 {
 	int ret = 0;

 	debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
 	       __func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);

 	if (!dfu->inited) {
 		dfu->i_buf_start = dfu_get_buf(dfu);
 		if (dfu->i_buf_start == NULL)
 			return -ENOMEM;

 		dfu->r_left = dfu->get_medium_size(dfu);
 		if (dfu->r_left < 0)
 			return dfu->r_left;
 		switch (dfu->layout) {
 		case DFU_RAW_ADDR:
 		case DFU_RAM_ADDR:
 			break;
 		default:
 			if (dfu->r_left > dfu_buf_size) {
 				printf("%s: File too big for buffer\n",
 				       __func__);
 				return -EOVERFLOW;
 			}
 		}

 		debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left);

 		dfu->i_blk_seq_num = 0;
 		dfu->crc = 0;
 		dfu->offset = 0;
 		dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
 		dfu->i_buf = dfu->i_buf_start;
 		dfu->b_left = 0;

 		dfu->bad_skip = 0;

 		dfu->inited = 1;
 	}

 	if (dfu->i_blk_seq_num != blk_seq_num) {
 		printf("%s: Wrong sequence number! [%d] [%d]\n",
 		       __func__, dfu->i_blk_seq_num, blk_seq_num);
 		return -1;
 	}
 	/* handle rollover */
 	dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;

 	ret = dfu_read_buffer_fill(dfu, buf, size);
 	if (ret < 0) {
 		printf("%s: Failed to fill buffer\n", __func__);
 		return -1;
 	}

 	if (ret < size) {
 		if (dfu_hash_algo)
 			debug("%s: %s %s: 0x%x\n", __func__, dfu->name,
 			      dfu_hash_algo->name, dfu->crc);
 		puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");

 		dfu_free_buf();
 		dfu->i_blk_seq_num = 0;
 		dfu->crc = 0;
 		dfu->offset = 0;
 		dfu->i_buf_start = dfu_buf;
 		dfu->i_buf_end = dfu_buf;
 		dfu->i_buf = dfu->i_buf_start;
 		dfu->b_left = 0;

 		dfu->bad_skip = 0;

 		dfu->inited = 0;
 	}

 	return ret;
 }

 static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
 			   char *interface, char *devstr)
 {
 	char *st;

 	debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
 	st = strsep(&s, " ");
 	strcpy(dfu->name, st);

 	dfu->alt = alt;
 	dfu->max_buf_size = 0;
 	dfu->free_entity = NULL;

 	/* Specific for mmc device */
 	if (strcmp(interface, "mmc") == 0) {
 		if (dfu_fill_entity_mmc(dfu, devstr, s))
 			return -1;
 	} else if (strcmp(interface, "nand") == 0) {
 		if (dfu_fill_entity_nand(dfu, devstr, s))
 			return -1;
 	} else if (strcmp(interface, "ram") == 0) {
 		if (dfu_fill_entity_ram(dfu, devstr, s))
 			return -1;
 	} else if (strcmp(interface, "sf") == 0) {
 		if (dfu_fill_entity_sf(dfu, devstr, s))
 			return -1;
 	} else {
 		printf("%s: Device %s not (yet) supported!\n",
 		       __func__,  interface);
 		return -1;
 	}

 	return 0;
 }

 void dfu_free_entities(void)
 {
 	struct dfu_entity *dfu, *p, *t = NULL;

 	list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
 		list_del(&dfu->list);
 		if (dfu->free_entity)
 			dfu->free_entity(dfu);
 		t = dfu;
 	}
 	if (t)
 		free(t);
 	INIT_LIST_HEAD(&dfu_list);

 	alt_num_cnt = 0;
 }

 int dfu_config_entities(char *env, char *interface, char *devstr)
 {
 	struct dfu_entity *dfu;
 	int i, ret;
 	char *s;

 	dfu_alt_num = dfu_find_alt_num(env);
 	debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);

 	dfu_hash_algo = NULL;
 	s = dfu_get_hash_algo();
 	if (s) {
 		ret = hash_lookup_algo(s, &dfu_hash_algo);
 		if (ret)
 			error("Hash algorithm %s not supported\n", s);
 	}

 	dfu = calloc(sizeof(*dfu), dfu_alt_num);
 	if (!dfu)
 		return -1;
 	for (i = 0; i < dfu_alt_num; i++) {

 		s = strsep(&env, ";");
 		ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
 				      devstr);
 		if (ret)
 			return -1;

 		list_add_tail(&dfu[i].list, &dfu_list);
 		alt_num_cnt++;
 	}

 	return 0;
 }

 const char *dfu_get_dev_type(enum dfu_device_type t)
 {
 	const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" };
 	return dev_t[t];
 }

 const char *dfu_get_layout(enum dfu_layout l)
 {
 	const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
 					   "EXT3", "EXT4", "RAM_ADDR" };
 	return dfu_layout[l];
 }

 void dfu_show_entities(void)
 {
 	struct dfu_entity *dfu;

 	puts("DFU alt settings list:\n");

 	list_for_each_entry(dfu, &dfu_list, list) {
 		printf("dev: %s alt: %d name: %s layout: %s\n",
 		       dfu_get_dev_type(dfu->dev_type), dfu->alt,
 		       dfu->name, dfu_get_layout(dfu->layout));
 	}
 }

 int dfu_get_alt_number(void)
 {
 	return dfu_alt_num;
 }

 struct dfu_entity *dfu_get_entity(int alt)
 {
 	struct dfu_entity *dfu;

 	list_for_each_entry(dfu, &dfu_list, list) {
 		if (dfu->alt == alt)
 			return dfu;
 	}

 	return NULL;
 }

 int dfu_get_alt(char *name)
 {
 	struct dfu_entity *dfu;

 	list_for_each_entry(dfu, &dfu_list, list) {
 		if (!strncmp(dfu->name, name, strlen(dfu->name)))
 			return dfu->alt;
 	}

 	return -ENODEV;
 }
	/*
	* dfu.c -- DFU back-end routines
	*
	* Copyright (C) 2012 Samsung Electronics
	* author: Lukasz Majewski <l.majewski@samsung.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <errno.h>
	#include <malloc.h>
	#include <mmc.h>
	#include <fat.h>
	#include <dfu.h>
	#include <hash.h>
	#include <linux/list.h>
	#include <linux/compiler.h>

	static bool dfu_reset_request;
	static LIST_HEAD(dfu_list);
	static int dfu_alt_num;
	static int alt_num_cnt;
	static struct hash_algo *dfu_hash_algo;

	bool dfu_reset(void)
	{
	return dfu_reset_request;
	}

	void dfu_trigger_reset()
	{
	dfu_reset_request = true;
	}

	static int dfu_find_alt_num(const char *s)
	{
	int i = 0;

	for (; *s; s++)
	if (*s == ';')
	i++;

	return ++i;
	}

	int dfu_init_env_entities(char interface, char devstr)
	{
	const char *str_env;
	char *env_bkp;
	int ret;

	str_env = getenv("dfu_alt_info");
	if (!str_env) {
	error("\"dfu_alt_info\" env variable not defined!\n");
	return -EINVAL;
	}

	env_bkp = strdup(str_env);
	ret = dfu_config_entities(env_bkp, interface, devstr);
	if (ret) {
	error("DFU entities configuration failed!\n");
	return ret;
	}

	free(env_bkp);
	return 0;
	}

	static unsigned char *dfu_buf;
	static unsigned long dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;

	unsigned char *dfu_free_buf(void)
	{
	free(dfu_buf);
	dfu_buf = NULL;
	return dfu_buf;
	}

	unsigned long dfu_get_buf_size(void)
	{
	return dfu_buf_size;
	}

	unsigned char dfu_get_buf(struct dfu_entity dfu)
	{
	char *s;

	if (dfu_buf != NULL)
	return dfu_buf;

	s = getenv("dfu_bufsiz");
	dfu_buf_size = s ? (unsigned long)simple_strtol(s, NULL, 16) :
	CONFIG_SYS_DFU_DATA_BUF_SIZE;
	if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
	dfu_buf_size = dfu->max_buf_size;

	dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
	if (dfu_buf == NULL)
	printf("%s: Could not memalign 0x%lx bytes\n",
	__func__, dfu_buf_size);

	return dfu_buf;
	}

	static char *dfu_get_hash_algo(void)
	{
	char *s;

	s = getenv("dfu_hash_algo");
	if (!s)
	return NULL;

	if (!strcmp(s, "crc32")) {
	debug("%s: DFU hash method: %s\n", __func__, s);
	return s;
	}

	error("DFU hash method: %s not supported!\n", s);
	return NULL;
	}

	static int dfu_write_buffer_drain(struct dfu_entity *dfu)
	{
	long w_size;
	int ret;

	/* flush size? */
	w_size = dfu->i_buf - dfu->i_buf_start;
	if (w_size == 0)
	return 0;

	if (dfu_hash_algo)
	dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
	dfu->i_buf_start, w_size, 0);

	ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
	if (ret)
	debug("%s: Write error!\n", __func__);

	/* point back */
	dfu->i_buf = dfu->i_buf_start;

	/* update offset */
	dfu->offset += w_size;

	puts("#");

	return ret;
	}

	void dfu_write_transaction_cleanup(struct dfu_entity *dfu)
	{
	/* clear everything */
	dfu_free_buf();
	dfu->crc = 0;
	dfu->offset = 0;
	dfu->i_blk_seq_num = 0;
	dfu->i_buf_start = dfu_buf;
	dfu->i_buf_end = dfu_buf;
	dfu->i_buf = dfu->i_buf_start;
	dfu->inited = 0;
	}

	int dfu_flush(struct dfu_entity dfu, void buf, int size, int blk_seq_num)
	{
	int ret = 0;

	ret = dfu_write_buffer_drain(dfu);
	if (ret)
	return ret;

	if (dfu->flush_medium)
	ret = dfu->flush_medium(dfu);

	if (dfu_hash_algo)
	printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
	dfu->crc);

	dfu_write_transaction_cleanup(dfu);

	return ret;
	}

	int dfu_write(struct dfu_entity dfu, void buf, int size, int blk_seq_num)
	{
	int ret;

	debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%x\n",
	__func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
	dfu->i_buf - dfu->i_buf_start);

	if (!dfu->inited) {
	/* initial state */
	dfu->crc = 0;
	dfu->offset = 0;
	dfu->bad_skip = 0;
	dfu->i_blk_seq_num = 0;
	dfu->i_buf_start = dfu_get_buf(dfu);
	if (dfu->i_buf_start == NULL)
	return -ENOMEM;
	dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
	dfu->i_buf = dfu->i_buf_start;

	dfu->inited = 1;
	}

	if (dfu->i_blk_seq_num != blk_seq_num) {
	printf("%s: Wrong sequence number! [%d] [%d]\n",
	__func__, dfu->i_blk_seq_num, blk_seq_num);
	dfu_write_transaction_cleanup(dfu);
	return -1;
	}

	/* DFU 1.1 standard says:
	* The wBlockNum field is a block sequence number. It increments each
	* time a block is transferred, wrapping to zero from 65,535. It is used
	* to provide useful context to the DFU loader in the device."
	*
	* This means that it's a 16 bit counter that roll-overs at
	* 0xffff -> 0x0000. By having a typical 4K transfer block
	* we roll-over at exactly 256MB. Not very fun to debug.
	*
	* Handling rollover, and having an inited variable,
	* makes things work.
	*/

	/* handle rollover */
	dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;

	/* flush buffer if overflow */
	if ((dfu->i_buf + size) > dfu->i_buf_end) {
	ret = dfu_write_buffer_drain(dfu);
	if (ret) {
	dfu_write_transaction_cleanup(dfu);
	return ret;
	}
	}

	/* we should be in buffer now (if not then size too large) */
	if ((dfu->i_buf + size) > dfu->i_buf_end) {
	error("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
	size, dfu->i_buf_end);
	dfu_write_transaction_cleanup(dfu);
	return -1;
	}

	memcpy(dfu->i_buf, buf, size);
	dfu->i_buf += size;

	/* if end or if buffer full flush */
	if (size == 0 \|\| (dfu->i_buf + size) > dfu->i_buf_end) {
	ret = dfu_write_buffer_drain(dfu);
	if (ret) {
	dfu_write_transaction_cleanup(dfu);
	return ret;
	}
	}

	return 0;
	}

	static int dfu_read_buffer_fill(struct dfu_entity dfu, void buf, int size)
	{
	long chunk;
	int ret, readn;

	readn = 0;
	while (size > 0) {
	/* get chunk that can be read */
	chunk = min(size, dfu->b_left);
	/* consume */
	if (chunk > 0) {
	memcpy(buf, dfu->i_buf, chunk);
	if (dfu_hash_algo)
	dfu_hash_algo->hash_update(dfu_hash_algo,
	&dfu->crc, buf,
	chunk, 0);

	dfu->i_buf += chunk;
	dfu->b_left -= chunk;
	size -= chunk;
	buf += chunk;
	readn += chunk;
	}

	/* all done */
	if (size > 0) {
	/* no more to read */
	if (dfu->r_left == 0)
	break;

	dfu->i_buf = dfu->i_buf_start;
	dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;

	/* got to read, but buffer is empty */
	if (dfu->b_left > dfu->r_left)
	dfu->b_left = dfu->r_left;
	ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
	&dfu->b_left);
	if (ret != 0) {
	debug("%s: Read error!\n", __func__);
	return ret;
	}
	dfu->offset += dfu->b_left;
	dfu->r_left -= dfu->b_left;

	puts("#");
	}
	}

	return readn;
	}

	int dfu_read(struct dfu_entity dfu, void buf, int size, int blk_seq_num)
	{
	int ret = 0;

	debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
	__func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);

	if (!dfu->inited) {
	dfu->i_buf_start = dfu_get_buf(dfu);
	if (dfu->i_buf_start == NULL)
	return -ENOMEM;

	dfu->r_left = dfu->get_medium_size(dfu);
	if (dfu->r_left < 0)
	return dfu->r_left;
	switch (dfu->layout) {
	case DFU_RAW_ADDR:
	case DFU_RAM_ADDR:
	break;
	default:
	if (dfu->r_left > dfu_buf_size) {
	printf("%s: File too big for buffer\n",
	__func__);
	return -EOVERFLOW;
	}
	}

	debug("%s: %s %ld [B]\n", __func__, dfu->name, dfu->r_left);

	dfu->i_blk_seq_num = 0;
	dfu->crc = 0;
	dfu->offset = 0;
	dfu->i_buf_end = dfu_get_buf(dfu) + dfu_buf_size;
	dfu->i_buf = dfu->i_buf_start;
	dfu->b_left = 0;

	dfu->bad_skip = 0;

	dfu->inited = 1;
	}

	if (dfu->i_blk_seq_num != blk_seq_num) {
	printf("%s: Wrong sequence number! [%d] [%d]\n",
	__func__, dfu->i_blk_seq_num, blk_seq_num);
	return -1;
	}
	/* handle rollover */
	dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;

	ret = dfu_read_buffer_fill(dfu, buf, size);
	if (ret < 0) {
	printf("%s: Failed to fill buffer\n", __func__);
	return -1;
	}

	if (ret < size) {
	if (dfu_hash_algo)
	debug("%s: %s %s: 0x%x\n", __func__, dfu->name,
	dfu_hash_algo->name, dfu->crc);
	puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");

	dfu_free_buf();
	dfu->i_blk_seq_num = 0;
	dfu->crc = 0;
	dfu->offset = 0;
	dfu->i_buf_start = dfu_buf;
	dfu->i_buf_end = dfu_buf;
	dfu->i_buf = dfu->i_buf_start;
	dfu->b_left = 0;

	dfu->bad_skip = 0;

	dfu->inited = 0;
	}

	return ret;
	}

	static int dfu_fill_entity(struct dfu_entity dfu, char s, int alt,
	char interface, char devstr)
	{
	char *st;

	debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
	st = strsep(&s, " ");
	strcpy(dfu->name, st);

	dfu->alt = alt;
	dfu->max_buf_size = 0;
	dfu->free_entity = NULL;

	/* Specific for mmc device */
	if (strcmp(interface, "mmc") == 0) {
	if (dfu_fill_entity_mmc(dfu, devstr, s))
	return -1;
	} else if (strcmp(interface, "nand") == 0) {
	if (dfu_fill_entity_nand(dfu, devstr, s))
	return -1;
	} else if (strcmp(interface, "ram") == 0) {
	if (dfu_fill_entity_ram(dfu, devstr, s))
	return -1;
	} else if (strcmp(interface, "sf") == 0) {
	if (dfu_fill_entity_sf(dfu, devstr, s))
	return -1;
	} else {
	printf("%s: Device %s not (yet) supported!\n",
	__func__, interface);
	return -1;
	}

	return 0;
	}

	void dfu_free_entities(void)
	{
	struct dfu_entity dfu, p, *t = NULL;

	list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
	list_del(&dfu->list);
	if (dfu->free_entity)
	dfu->free_entity(dfu);
	t = dfu;
	}
	if (t)
	free(t);
	INIT_LIST_HEAD(&dfu_list);

	alt_num_cnt = 0;
	}

	int dfu_config_entities(char env, char interface, char *devstr)
	{
	struct dfu_entity *dfu;
	int i, ret;
	char *s;

	dfu_alt_num = dfu_find_alt_num(env);
	debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);

	dfu_hash_algo = NULL;
	s = dfu_get_hash_algo();
	if (s) {
	ret = hash_lookup_algo(s, &dfu_hash_algo);
	if (ret)
	error("Hash algorithm %s not supported\n", s);
	}

	dfu = calloc(sizeof(*dfu), dfu_alt_num);
	if (!dfu)
	return -1;
	for (i = 0; i < dfu_alt_num; i++) {

	s = strsep(&env, ";");
	ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
	devstr);
	if (ret)
	return -1;

	list_add_tail(&dfu[i].list, &dfu_list);
	alt_num_cnt++;
	}

	return 0;
	}

	const char *dfu_get_dev_type(enum dfu_device_type t)
	{
	const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM" };
	return dev_t[t];
	}

	const char *dfu_get_layout(enum dfu_layout l)
	{
	const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
	"EXT3", "EXT4", "RAM_ADDR" };
	return dfu_layout[l];
	}

	void dfu_show_entities(void)
	{
	struct dfu_entity *dfu;

	puts("DFU alt settings list:\n");

	list_for_each_entry(dfu, &dfu_list, list) {
	printf("dev: %s alt: %d name: %s layout: %s\n",
	dfu_get_dev_type(dfu->dev_type), dfu->alt,
	dfu->name, dfu_get_layout(dfu->layout));
	}
	}

	int dfu_get_alt_number(void)
	{
	return dfu_alt_num;
	}

	struct dfu_entity *dfu_get_entity(int alt)
	{
	struct dfu_entity *dfu;

	list_for_each_entry(dfu, &dfu_list, list) {
	if (dfu->alt == alt)
	return dfu;
	}

	return NULL;
	}

	int dfu_get_alt(char *name)
	{
	struct dfu_entity *dfu;

	list_for_each_entry(dfu, &dfu_list, list) {
	if (!strncmp(dfu->name, name, strlen(dfu->name)))
	return dfu->alt;
	}

	return -ENODEV;
	}