[media] dvb-usb/it913x: multi firmware loader

Multi firmware loader
 This uses scatter write firmware headers
 The firmware must start with 03 XX 00
 and be the extract firmware length.

 I have tried all available firmwares with this loader.
Signed-off-by: NMalcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/it913x.c

@@ -485,35 +485,40 @@ static int it913x_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 	return ret;
 }
 
-
 static int it913x_download_firmware(struct usb_device *udev,
 					const struct firmware *fw)
 {
-	int ret = 0, i;
-	u8 packet_size, dlen;
+	int ret = 0, i = 0, pos = 0;
+	u8 packet_size;
 	u8 *fw_data;
 
-	packet_size = 0x29;
-
 	ret = it913x_wr_reg(udev, DEV_0,  I2C_CLK, I2C_CLK_100);
 
 	info("FRM Starting Firmware Download");
-	/* This uses scatter write firmware headers follow */
-	/* 03 XX 00     XX = chip number? */ 
-
-	for (i = 0; i < fw->size; i += packet_size) {
-			if (i > 0)
-				packet_size = 0x39;
-			fw_data = (u8 *)(fw->data + i);
-			dlen = ((i + packet_size) > fw->size)
-				? (fw->size - i) : packet_size;
-			ret |= it913x_io(udev, WRITE_DATA, DEV_0,
-				CMD_SCATTER_WRITE, 0, 0, fw_data, dlen);
-			udelay(1000);
+
+	/* Multi firmware loader */
+	/* This uses scatter write firmware headers */
+	/* The firmware must start with 03 XX 00 */
+	/* and be the extact firmware length */
+
+	while (i <= fw->size) {
+		if (((fw->data[i] == 0x3) && (fw->data[i + 2] == 0x0))
+			|| (i == fw->size)) {
+			packet_size = i - pos;
+			if ((packet_size > 0x19) || (i == fw->size)) {
+				fw_data = (u8 *)(fw->data + pos);
+				pos += packet_size;
+				if (packet_size > 0)
+					ret |= it913x_io(udev, WRITE_DATA,
+						DEV_0, CMD_SCATTER_WRITE, 0,
+						0, fw_data, packet_size);
+				udelay(1000);
+			}
+		}
+		i++;
 	}
 
-	ret |= it913x_io(udev, WRITE_CMD, DEV_0,
-			CMD_BOOT, 0, 0, NULL, 0);
+	ret |= it913x_io(udev, WRITE_CMD, DEV_0, CMD_BOOT, 0, 0, NULL, 0);
 
 	msleep(100);