ASoC: wm0010: Add checking for .dfw info record version.

The info record at the start of the dsp firmware file has been
expanded to incorporate additional version information. We need
to check the version to make sure we understand the layout of
the information in the record. The srec2image tool is currently
used to create this record during creation of the .dfw file.

Signed-off-by: Scott Ling <sl@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm0010.c

@@ -31,6 +31,9 @@
 
 #define DEVICE_ID_WM0010	10
 
+/* We only support v1 of the .dfw INFO record */
+#define INFO_VERSION		1
+
 enum dfw_cmd {
 	DFW_CMD_FUSE = 0x01,
 	DFW_CMD_CODE_HDR,
@@ -46,6 +49,13 @@ struct dfw_binrec {
 	uint8_t data[0];
 } __packed;
 
+struct dfw_inforec {
+	u8 info_version;
+	u8 tool_major_version;
+	u8 tool_minor_version;
+	u8 dsp_target;
+};
+
 struct dfw_pllrec {
 	u8 command;
 	u32 length:24;
@@ -342,6 +352,7 @@ static int wm0010_firmware_load(char *name, struct snd_soc_codec *codec)
 	struct completion done;
 	const struct firmware *fw;
 	const struct dfw_binrec *rec;
+	const struct dfw_inforec *inforec;
 	u64 *img;
 	u8 *out, dsp;
 	u32 len, offset;
@@ -356,8 +367,9 @@ static int wm0010_firmware_load(char *name, struct snd_soc_codec *codec)
 	}
 
 	rec = (const struct dfw_binrec *)fw->data;
+	inforec = (const struct dfw_inforec *)rec->data;
 	offset = 0;
-	dsp = rec->data[0];
+	dsp = inforec->dsp_target;
 	wm0010->boot_failed = false;
 	BUG_ON(!list_empty(&xfer_list));
 	init_completion(&done);
@@ -369,6 +381,17 @@ static int wm0010_firmware_load(char *name, struct snd_soc_codec *codec)
 		goto abort;
 	}
 
+	if (inforec->info_version != INFO_VERSION) {
+		dev_err(codec->dev,
+			"Unsupported version (%02d) of INFO record\r\n",
+			inforec->info_version);
+		ret = -EINVAL;
+		goto abort;
+	}
+
+	dev_dbg(codec->dev, "Version v%02d INFO record found\r\n",
+		inforec->info_version);
+
 	/* Check it's a DSP file */
 	if (dsp != DEVICE_ID_WM0010) {
 		dev_err(codec->dev, "Not a WM0010 firmware file.\r\n");