[media] si2168: Support Si2168-A20 firmware downloading

This adds support for the Si2168-A20 firmware download.

Extracting the firmware:

wget http://www.tbsdtv.com/download/document/tbs6281/tbs6281-t2-t-driver_v1.0.0.6.zip
unzip tbs6281-t2-t-driver_v1.0.0.6.zip
dd if=tbs-6281_x64/tbs6281_64.sys of=dvb-demod-si2168-a20-01.fw count=28656 bs=1 skip=1625088

md5sum:
32e06713b33915f674bfb2c209beaea5 /lib/firmware/dvb-demod-si2168-a20-01.fw
Signed-off-by: Luis Alves <ljalvs@gmail.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-frontends/si2168.c

@@ -398,10 +398,14 @@ static int si2168_init(struct dvb_frontend *fe)
 	chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 | cmd.args[3] << 8 |
 			cmd.args[4] << 0;
 
+	#define SI2168_A20 ('A' << 24 | 68 << 16 | '2' << 8 | '0' << 0)
 	#define SI2168_A30 ('A' << 24 | 68 << 16 | '3' << 8 | '0' << 0)
 	#define SI2168_B40 ('B' << 24 | 68 << 16 | '4' << 8 | '0' << 0)
 
 	switch (chip_id) {
+	case SI2168_A20:
+		fw_file = SI2168_A20_FIRMWARE;
+		break;
 	case SI2168_A30:
 		fw_file = SI2168_A30_FIRMWARE;
 		break;
@@ -693,5 +697,6 @@ module_i2c_driver(si2168_driver);
 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 MODULE_DESCRIPTION("Silicon Labs Si2168 DVB-T/T2/C demodulator driver");
 MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(SI2168_A20_FIRMWARE);
 MODULE_FIRMWARE(SI2168_A30_FIRMWARE);
 MODULE_FIRMWARE(SI2168_B40_FIRMWARE);

drivers/media/dvb-frontends/si2168_priv.h

@@ -22,6 +22,7 @@
 #include <linux/firmware.h>
 #include <linux/i2c-mux.h>
 
+#define SI2168_A20_FIRMWARE "dvb-demod-si2168-a20-01.fw"
 #define SI2168_A30_FIRMWARE "dvb-demod-si2168-a30-01.fw"
 #define SI2168_B40_FIRMWARE "dvb-demod-si2168-b40-01.fw"
 #define SI2168_B40_FIRMWARE_FALLBACK "dvb-demod-si2168-01.fw"