media: si2168: Add ts bus coontrol, turn off bus on sleep

Includes a function to set TS MODE property os si2168. The function
either disables the TS output bus, or sets mode to config option.

When going to sleep the TS bus is turned off, this makes the driver
compatible with multiple frontend usage.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/si2168.c

@@ -409,6 +409,30 @@ static int si2168_set_frontend(struct dvb_frontend *fe)
 	return ret;
 }
 
+static int si2168_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
+{
+	struct i2c_client *client = fe->demodulator_priv;
+	struct si2168_dev *dev = i2c_get_clientdata(client);
+	struct si2168_cmd cmd;
+	int ret = 0;
+
+	dev_dbg(&client->dev, "%s acquire: %d\n", __func__, acquire);
+
+	/* set TS_MODE property */
+	memcpy(cmd.args, "\x14\x00\x01\x10\x10\x00", 6);
+	if (acquire)
+		cmd.args[4] |= dev->ts_mode;
+	else
+		cmd.args[4] |= SI2168_TS_TRISTATE;
+	if (dev->ts_clock_gapped)
+		cmd.args[4] |= 0x40;
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2168_cmd_execute(client, &cmd);
+
+	return ret;
+}
+
 static int si2168_init(struct dvb_frontend *fe)
 {
 	struct i2c_client *client = fe->demodulator_priv;
@@ -540,14 +564,7 @@ static int si2168_init(struct dvb_frontend *fe)
 		 dev->version >> 24 & 0xff, dev->version >> 16 & 0xff,
 		 dev->version >> 8 & 0xff, dev->version >> 0 & 0xff);
 
-	/* set ts mode */
-	memcpy(cmd.args, "\x14\x00\x01\x10\x10\x00", 6);
-	cmd.args[4] |= dev->ts_mode;
-	if (dev->ts_clock_gapped)
-		cmd.args[4] |= 0x40;
-	cmd.wlen = 6;
-	cmd.rlen = 4;
-	ret = si2168_cmd_execute(client, &cmd);
+	ret = si2168_ts_bus_ctrl(fe, 1);
 	if (ret)
 		goto err;
 
@@ -584,6 +601,9 @@ static int si2168_sleep(struct dvb_frontend *fe)
 
 	dev->active = false;
 
+	/* tri-state data bus */
+	si2168_ts_bus_ctrl(fe, 0);
+
 	/* Firmware B 4.0-11 or later loses warm state during sleep */
 	if (dev->version > ('B' << 24 | 4 << 16 | 0 << 8 | 11 << 0))
 		dev->warm = false;
@@ -681,6 +701,8 @@ static const struct dvb_frontend_ops si2168_ops = {
 	.init = si2168_init,
 	.sleep = si2168_sleep,
 
+	.ts_bus_ctrl          = si2168_ts_bus_ctrl,
+
 	.set_frontend = si2168_set_frontend,
 
 	.read_status = si2168_read_status,

drivers/media/dvb-frontends/si2168.h

@@ -38,6 +38,7 @@ struct si2168_config {
 	/* TS mode */
 #define SI2168_TS_PARALLEL	0x06
 #define SI2168_TS_SERIAL	0x03
+#define SI2168_TS_TRISTATE	0x00
 	u8 ts_mode;
 
 	/* TS clock inverted */