MIPS: PS2: ROM: rom_version

Signed-off-by: Fredrik Noring <noring@nocrew.org>

arch/mips/include/asm/mach-ps2/rom.h

@@ -113,6 +113,40 @@ extern struct rom_dir rom1_dir;		/* ROM1 directory (DVD) */
 ssize_t rom_read_file(const struct rom_dir dir,
 	const char *name, void *buffer, size_t size, loff_t offset);
 
+/**
+ * struct rom_ver - ROM version
+ * @number: ROM version number
+ * @region: ROM region with 'J' for Japan, 'E' for Europe, 'C' for China,
+ * 	and 'A' or 'H' for the USA
+ * @unknown: unknown member
+ * @date: date ROM was created
+ * @date.year: year ROM was created
+ * @date.month: month ROM was created
+ * @date.day: day ROM was created
+ *
+ * A ROM version is considered to be invalid if @number is zero, in which
+ * case all members are zero except @region and @unknown that are ``'-'``.
+ */
+struct rom_ver {
+	int number;
+	char region;
+	char unknown;
+	struct {
+		int year;
+		int month;
+		int day;
+	} date;
+};
+
+/**
+ * rom_version - read the ROMVER file in ROM0
+ *
+ * Context: any
+ * Return: ROM version; or, if reading failed, all members zeroed except
+ *      @region and @unknown that are set to ``'-'``
+ */
+struct rom_ver rom_version(void);
+
 /* The ROM functions below are mainly for internal use. */
 
 /**

arch/mips/ps2/rom.c

@@ -215,6 +215,20 @@ ssize_t rom_read_file(const struct rom_dir dir,
 }
 EXPORT_SYMBOL_GPL(rom_read_file);
 
+struct rom_ver rom_version(void)
+{
+	struct rom_ver v = { };
+	char buffer[20] = { };
+	ssize_t r = rom_read_file(rom0_dir, "ROMVER",
+		buffer, sizeof(buffer) - 1, 0);
+
+	return r > 0 && sscanf(buffer, "%4x%c%c%4d%2d%2d",
+				&v.number, &v.region, &v.unknown,
+				&v.date.year, &v.date.month, &v.date.day) == 6 ?
+		v : (struct rom_ver) { .region = '-', .unknown = '-' };
+}
+EXPORT_SYMBOL_GPL(rom_version);
+
 /**
  * find_reset_string - find the offset to the ``"RESET"`` string, if it exists
  * @rom: ROM to search in
@@ -422,7 +436,7 @@ static int __init ps2_rom_init(void)
 	rom1_dir = rom_dir_init("rom1", ROM1_BASE, ROM1_SIZE);
 
 	v = rom_version();
-	pr_info("rom0: Version %04d %c %c %04d-%02d-%02d\n",
+	pr_info("rom0: Version %04x %c %c %04d-%02d-%02d\n",
 		v.number, v.region, v.unknown,
 		v.date.year, v.date.month, v.date.day);