media: si2157: Add analog tuning related functions

Include set_analog_params, get_frequency, and get_bandwidth.

Tested with NTSC and PAL standards via ch3/4 generator. Other standards
are included, but are untested due to lack of generator.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/tuners/si2157.c

@@ -371,7 +371,7 @@ static int si2157_set_params(struct dvb_frontend *fe)
 	if (ret)
 		goto err;
 
-	/* set if frequency if needed */
+	/* set digital if frequency if needed */
 	if (if_frequency != dev->if_frequency) {
 		memcpy(cmd.args, "\x14\x00\x06\x07", 4);
 		cmd.args[4] = (if_frequency / 1000) & 0xff;
@@ -385,7 +385,7 @@ static int si2157_set_params(struct dvb_frontend *fe)
 		dev->if_frequency = if_frequency;
 	}
 
-	/* set frequency */
+	/* set digital frequency */
 	memcpy(cmd.args, "\x41\x00\x00\x00\x00\x00\x00\x00", 8);
 	cmd.args[4] = (c->frequency >>  0) & 0xff;
 	cmd.args[5] = (c->frequency >>  8) & 0xff;
@@ -397,18 +397,240 @@ static int si2157_set_params(struct dvb_frontend *fe)
 	if (ret)
 		goto err;
 
+	dev->bandwidth = bandwidth;
+	dev->frequency = c->frequency;
+
 	return 0;
 err:
+	dev->bandwidth = 0;
+	dev->frequency = 0;
+	dev->if_frequency = 0;
 	dev_dbg(&client->dev, "failed=%d\n", ret);
 	return ret;
 }
 
+static int si2157_set_analog_params(struct dvb_frontend *fe,
+				    struct analog_parameters *params)
+{
+	struct i2c_client *client = fe->tuner_priv;
+	struct si2157_dev *dev = i2c_get_clientdata(client);
+	char *std; /* for debugging */
+	int ret;
+	struct si2157_cmd cmd;
+	u32 bandwidth = 0;
+	u32 if_frequency = 0;
+	u32 freq = 0;
+	u64 tmp_lval = 0;
+	u8 system = 0;
+	u8 color = 0;    /* 0=NTSC/PAL, 0x10=SECAM */
+	u8 invert_analog = 1; /* analog tuner spectrum; 0=normal, 1=inverted */
+
+	if (dev->chiptype != SI2157_CHIPTYPE_SI2157) {
+		dev_info(&client->dev, "Analog tuning not supported for chiptype=%u\n",
+			 dev->chiptype);
+		ret = -EINVAL;
+		goto err;
+	}
+
+	if (!dev->active)
+		si2157_init(fe);
+
+	if (!dev->active) {
+		ret = -EAGAIN;
+		goto err;
+	}
+	if (params->mode == V4L2_TUNER_RADIO) {
+	/*
+	 * std = "fm";
+	 * bandwidth = 1700000; //best can do for FM, AGC will be a mess though
+	 * if_frequency = 1250000;  //HVR-225x(saa7164), HVR-12xx(cx23885)
+	 * if_frequency = 6600000;  //HVR-9xx(cx231xx)
+	 * if_frequency = 5500000;  //HVR-19xx(pvrusb2)
+	 */
+		dev_err(&client->dev, "si2157 does not currently support FM radio\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	tmp_lval = params->frequency * 625LL;
+	do_div(tmp_lval, 10); /* convert to HZ */
+	freq = (u32)tmp_lval;
+
+	if (freq < 1000000) /* is freq in KHz */
+		freq = freq * 1000;
+	dev->frequency = freq;
+
+	/* if_frequency values based on tda187271C2 */
+	if (params->std & (V4L2_STD_B | V4L2_STD_GH)) {
+		if (freq >= 470000000) {
+			std = "palGH";
+			bandwidth = 8000000;
+			if_frequency = 6000000;
+			system = 1;
+			if (params->std &
+			    (V4L2_STD_SECAM_G | V4L2_STD_SECAM_H)) {
+				std = "secamGH";
+				color = 0x10;
+			}
+		} else {
+			std = "palB";
+			bandwidth = 7000000;
+			if_frequency = 6000000;
+			system = 0;
+			if (params->std & V4L2_STD_SECAM_B) {
+				std = "secamB";
+				color = 0x10;
+			}
+		}
+	} else if (params->std & V4L2_STD_MN) {
+		std = "MN";
+		bandwidth = 6000000;
+		if_frequency = 5400000;
+		system = 2;
+	} else if (params->std & V4L2_STD_PAL_I) {
+		std = "palI";
+		bandwidth = 8000000;
+		if_frequency = 7250000; /* TODO: does not work yet */
+		system = 4;
+	} else if (params->std & V4L2_STD_DK) {
+		std = "palDK";
+		bandwidth = 8000000;
+		if_frequency = 6900000; /* TODO: does not work yet */
+		system = 5;
+		if (params->std & V4L2_STD_SECAM_DK) {
+			std = "secamDK";
+			color = 0x10;
+		}
+	} else if (params->std & V4L2_STD_SECAM_L) {
+		std = "secamL";
+		bandwidth = 8000000;
+		if_frequency = 6750000; /* TODO: untested */
+		system = 6;
+		color = 0x10;
+	} else if (params->std & V4L2_STD_SECAM_LC) {
+		std = "secamL'";
+		bandwidth = 7000000;
+		if_frequency = 1250000; /* TODO: untested */
+		system = 7;
+		color = 0x10;
+	} else {
+		std = "unknown";
+	}
+	/* calc channel center freq */
+	freq = freq - 1250000 + (bandwidth / 2);
+
+	dev_dbg(&client->dev,
+		"mode=%d system=%u std='%s' params->frequency=%u center freq=%u if=%u bandwidth=%u\n",
+		params->mode, system, std, params->frequency,
+		freq, if_frequency, bandwidth);
+
+	/* set analog IF port */
+	memcpy(cmd.args, "\x14\x00\x03\x06\x08\x02", 6);
+	/* in using dev->if_port, we assume analog and digital IF's */
+	/*   are always on different ports */
+	/* assumes if_port definition is 0 or 1 for digital out */
+	cmd.args[4] = (dev->if_port == 1) ? 8 : 10;
+	/* Analog AGC assumed external */
+	cmd.args[5] = (dev->if_port == 1) ? 2 : 1;
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	/* set analog IF output config */
+	memcpy(cmd.args, "\x14\x00\x0d\x06\x94\x64", 6);
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	/* make this distinct from a digital IF */
+	dev->if_frequency = if_frequency | 1;
+
+	/* calc and set tuner analog if center frequency */
+	if_frequency = if_frequency + 1250000 - (bandwidth / 2);
+	dev_dbg(&client->dev, "IF Ctr freq=%d\n", if_frequency);
+
+	memcpy(cmd.args, "\x14\x00\x0C\x06", 4);
+	cmd.args[4] = (if_frequency / 1000) & 0xff;
+	cmd.args[5] = ((if_frequency / 1000) >> 8) & 0xff;
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	/* set analog AGC config */
+	memcpy(cmd.args, "\x14\x00\x07\x06\x32\xc8", 6);
+	cmd.wlen = 6;
+	cmd.rlen = 4;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	/* set analog video mode */
+	memcpy(cmd.args, "\x14\x00\x04\x06\x00\x00", 6);
+	cmd.args[4] = system | color;
+	/* can use dev->inversion if assumed applies to both digital/analog */
+	if (invert_analog)
+		cmd.args[5] |= 0x02;
+	cmd.wlen = 6;
+	cmd.rlen = 1;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	/* set analog frequency */
+	memcpy(cmd.args, "\x41\x01\x00\x00\x00\x00\x00\x00", 8);
+	cmd.args[4] = (freq >>  0) & 0xff;
+	cmd.args[5] = (freq >>  8) & 0xff;
+	cmd.args[6] = (freq >> 16) & 0xff;
+	cmd.args[7] = (freq >> 24) & 0xff;
+	cmd.wlen = 8;
+	cmd.rlen = 1;
+	ret = si2157_cmd_execute(client, &cmd);
+	if (ret)
+		goto err;
+
+	dev->bandwidth = bandwidth;
+
+	return 0;
+err:
+	dev->bandwidth = 0;
+	dev->frequency = 0;
+	dev->if_frequency = 0;
+	dev_dbg(&client->dev, "failed=%d\n", ret);
+	return ret;
+}
+
+static int si2157_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+	struct i2c_client *client = fe->tuner_priv;
+	struct si2157_dev *dev = i2c_get_clientdata(client);
+
+	*frequency = dev->frequency;
+	dev_dbg(&client->dev, "freq=%u\n", dev->frequency);
+	return 0;
+}
+
+static int si2157_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
+{
+	struct i2c_client *client = fe->tuner_priv;
+	struct si2157_dev *dev = i2c_get_clientdata(client);
+
+	*bandwidth = dev->bandwidth;
+	dev_dbg(&client->dev, "bandwidth=%u\n", dev->bandwidth);
+	return 0;
+}
+
 static int si2157_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct i2c_client *client = fe->tuner_priv;
 	struct si2157_dev *dev = i2c_get_clientdata(client);
 
-	*frequency = dev->if_frequency;
+	*frequency = dev->if_frequency & ~1; /* strip analog IF indicator bit */
+	dev_dbg(&client->dev, "if_frequency=%u\n", *frequency);
 	return 0;
 }
 
@@ -422,6 +644,9 @@ static const struct dvb_tuner_ops si2157_ops = {
 	.init = si2157_init,
 	.sleep = si2157_sleep,
 	.set_params = si2157_set_params,
+	.set_analog_params = si2157_set_analog_params,
+	.get_frequency     = si2157_get_frequency,
+	.get_bandwidth     = si2157_get_bandwidth,
 	.get_if_frequency = si2157_get_if_frequency,
 };
 

drivers/media/tuners/si2157_priv.h

@@ -29,6 +29,8 @@ struct si2157_dev {
 	u8 chiptype;
 	u8 if_port;
 	u32 if_frequency;
+	u32 bandwidth;
+	u32 frequency;
 	struct delayed_work stat_work;
 
 #if defined(CONFIG_MEDIA_CONTROLLER)