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-rw-r--r--firmware/target/hosted/sysfs.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/firmware/target/hosted/sysfs.c b/firmware/target/hosted/sysfs.c
new file mode 100644
index 0000000000..177f338911
--- /dev/null
+++ b/firmware/target/hosted/sysfs.c
@@ -0,0 +1,200 @@
+/***************************************************************************
+ * __________ __ ___
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ *
+ * Copyright (C) 2014 by Ilia Sergachev: Initial Rockbox port to iBasso DX50
+ * Copyright (C) 2014 by Mario Basister: iBasso DX90 port
+ * Copyright (C) 2014 by Simon Rothen: Initial Rockbox repository submission, additional features
+ * Copyright (C) 2014 by Udo Schl├Ąpfer: Code clean up, additional features
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+
+#include <stdio.h>
+#include <string.h>
+
+#include "config.h"
+#include "debug.h"
+#include "sysfs.h"
+
+
+static FILE* open_read(const char *file_name)
+{
+ FILE *f = fopen(file_name, "r");
+ if(f == NULL)
+ {
+ DEBUGF("ERROR %s: Can not open %s for reading.", __func__, file_name);
+ }
+
+ return f;
+}
+
+
+static FILE* open_write(const char* file_name)
+{
+ FILE *f = fopen(file_name, "w");
+ if(f == NULL)
+ {
+ DEBUGF("ERROR %s: Can not open %s for writing.", __func__, file_name);
+ }
+
+ return f;
+}
+
+
+bool sysfs_get_int(const char *path, int *value)
+{
+ *value = -1;
+
+ FILE *f = open_read(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+ if(fscanf(f, "%d", value) == EOF)
+ {
+ DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
+ success = false;
+ }
+
+ fclose(f);
+ return success;
+}
+
+
+bool sysfs_set_int(const char *path, int value)
+{
+ FILE *f = open_write(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+ if(fprintf(f, "%d", value) < 0)
+ {
+ DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
+ success = false;
+ }
+
+ fclose(f);
+ return success;
+}
+
+
+bool sysfs_get_char(const char *path, char *value)
+{
+ int c;
+ FILE *f = open_read(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+ c = fgetc(f);
+
+ if(c == EOF)
+ {
+ DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
+ success = false;
+ }
+ else
+ {
+ *value = c;
+ }
+
+ fclose(f);
+ return success;
+}
+
+
+bool sysfs_set_char(const char *path, char value)
+{
+ FILE *f = open_write(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+ if(fprintf(f, "%c", value) < 1)
+ {
+ DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
+ success = false;
+ }
+
+ fclose(f);
+ return success;
+}
+
+
+bool sysfs_get_string(const char *path, char *value, int size)
+{
+ value[0] = '\0';
+ FILE *f = open_read(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+
+ /* fgets returns NULL if en error occured OR
+ * when EOF occurs while no characters have been read.
+ *
+ * Empty string is not an error for us.
+ */
+ if(fgets(value, size, f) == NULL && value[0] != '\0')
+ {
+ DEBUGF("ERROR %s: Read failed for %s.", __func__, path);
+ success = false;
+ }
+ else
+ {
+ size_t length = strlen(value);
+ if((length > 0) && value[length - 1] == '\n')
+ {
+ value[length - 1] = '\0';
+ }
+ }
+
+ fclose(f);
+ return success;
+}
+
+
+bool sysfs_set_string(const char *path, char *value)
+{
+ FILE *f = open_write(path);
+ if(f == NULL)
+ {
+ return false;
+ }
+
+ bool success = true;
+
+ /* If an output error is encountered, a negative value is returned */
+ if(fprintf(f, "%s", value) < 0)
+ {
+ DEBUGF("ERROR %s: Write failed for %s.", __func__, path);
+ success = false;
+ }
+
+ fclose(f);
+ return success;
+}