Read/write VFAT support from Rockbox-3.3 FAT stack

Add read/write VFAT support from Rockbox-3.3 FAT stack.
It should be also applicable to the unmodified 2009.11 U-Boot release.

Note that is was taken as is from Rockbox and from a older U-Boot
Rockbox patch. "checkpatch" shows very many coding style errors and
warnings, but it is tedious work to clean this up.

To make this patch work an additional mmc_block_write() board support
routine and the errno variable are needed.
Furthermore following defines in the board config header file:
	#define CONFIG_ROCKBOX_FAT	1
	#define CONFIG_U_BOOT		1
	#define CONFIG_SUPPORT_VFAT	1
	#define CONFIG_CMD_TREE_FAT
This will be added in a follow-up patch.

This patch is based on the patch from Etienne Carriere
<etienne.carriere@stericsson.com> for the U671x U-Boot:

This commit adds FAT write support to u-boot native read-only FAT code.
Commit initially applied on u-boot-v2009.01
(SHA1: 72d15e705bc3983884105cb7755c7ba80e74a0a5)

Based on FAT stack dumped from Rockbox package v3.1 (www.rockbox.org).
Based on initial Rockbox FAT stack integration in u-boot by Keith Outwater
(outwater@comcast.net).
Current porting is aligned with Rockbox v3.3 FAT stack.

Enable upon config switches:
CONFIG_CMD_FAT
CONFIG_ROCKBOX_FAT
CONFIG_CMD_TREE_FAT   (recommended)
CONFIG_SUPPORT_VFAT   (recommended)

C code APIs (from U-boot native FAT support):
int  fat_register_device(block_dev_desc_t *dev_desc, int part_no);
long file_fat_read(const char *path, void *buf, unsigned long maxsize);
int file_fat_ls(const char *dirname);
int file_fat_detectfs(void);

C code APIs (added by Rockbox FAT support):
long file_fat_write(const char *path, void *buf, unsigned long maxsize);
int file_fat_rm(const char *path);
int file_fat_rmdir(const char *path);
int file_fat_mkdir(const char *path);
int file_fat_cd(const char *path);
int file_fat_pwd(void);
int file_fat_mv(const char *oldpath, const char *newpath);
unsigned int rockbox_fat_free(unsigned long size_kbyte);
unsigned int rockbox_fat_size(void);

Use "help fat" from u-boot console to see available commands.

ST-Ericsson ID: WP264488

Change-Id: I9afc29ecb80f9152bd8534bbf11e47e54cfad796
Signed-off-by: Michael Brandt <michael.brandt@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/3009

1 files changed, 16 insertions, 2 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
index e87073440..7fd3191a7 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -5,6 +5,7 @@
  *
  * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
  * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
+ * 2006-01-18 - Keith Outwater (outwater@comcast.net) - added write support
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -32,10 +33,22 @@
 #include <linux/stat.h>
 #include <linux/time.h>
 
+#include "rockbox_debug.h"
+
+#ifdef CONFIG_ROCKBOX_FAT
+extern cur_block_dev_t cur_block_dev;
+#endif
+
+#if !defined(CONFIG_ROCKBOX_FAT)
 /* Supported filesystems */
 static const struct filesystem filesystems[] = {
-	{ file_fat_detectfs,  file_fat_ls,  file_fat_read,  "FAT" },
+	{ detect:	file_fat_detectfs,
+	  ls:		file_fat_ls,
+	  read:		file_fat_read,
+	  "FAT"
+	},
 };
+
 #define NUM_FILESYS	(sizeof(filesystems)/sizeof(struct filesystem))
 
 /* The filesystem which was last detected */
@@ -138,10 +151,10 @@ file_cd(const char *path)
 		pathcpy(tmpstr+1, path);
 	}
 
+	fat_dprintf("New CWD is '%s'\n", file_cwd);
 	return 0;
 }
 
-
 int
 file_detectfs(void)
 {
@@ -202,3 +215,4 @@ file_read(const char *filename, void *buffer, unsigned long maxsize)
 
 	return filesystems[current_filesystem].read(arg, buffer, maxsize);
 }
+#endif /* #if !defined(CONFIG_ROCKBOX_FAT) */