[media] si2157: Add support for spectral inversion

This is needed for PCTV 522e support.

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/tuners/si2157.c

@@ -253,6 +253,8 @@ static int si2157_set_params(struct dvb_frontend *fe)
 
 	memcpy(cmd.args, "\x14\x00\x03\x07\x00\x00", 6);
 	cmd.args[4] = delivery_system | bandwidth;
+	if (s->inversion)
+		cmd.args[5] = 0x01;
 	cmd.wlen = 6;
 	cmd.rlen = 1;
 	ret = si2157_cmd_execute(s, &cmd);
@@ -307,6 +309,7 @@ static int si2157_probe(struct i2c_client *client,
 
 	s->client = client;
 	s->fe = cfg->fe;
+	s->inversion = cfg->inversion;
 	mutex_init(&s->i2c_mutex);
 
 	/* check if the tuner is there */

drivers/media/tuners/si2157.h

@@ -29,6 +29,11 @@ struct si2157_config {
 	 * frontend
 	 */
 	struct dvb_frontend *fe;
+
+	/*
+	 * Spectral Inversion
+	 */
+	bool inversion;
 };
 
 #endif

drivers/media/tuners/si2157_priv.h

@@ -26,6 +26,7 @@ struct si2157 {
 	struct i2c_client *client;
 	struct dvb_frontend *fe;
 	bool active;
+	bool inversion;
 };
 
 /* firmare command struct */