[media] ts2020: add ts2020 tuner driver

add separate ts2020 tuner driver

Signed-off-by: Konstantin Dimitrov <kosio.dimitrov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 323 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c
new file mode 100644
index 000000000000..8dce4ae55f09
--- /dev/null
+++ b/drivers/media/dvb-frontends/ts2020.c
@@ -0,0 +1,323 @@
+/*
+    Montage Technology TS2020 - Silicon Tuner driver
+    Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
+
+    Copyright (C) 2009-2012 TurboSight.com
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "dvb_frontend.h"
+#include "ts2020.h"
+
+#define TS2020_XTAL_FREQ   27000 /* in kHz */
+
+struct ts2020_state {
+	u8 tuner_address;
+	struct i2c_adapter *i2c;
+};
+
+static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
+{
+	struct ts2020_state *state = fe->tuner_priv;
+
+	int ret;
+	u8 b0[] = { reg };
+	u8 b1[] = { 0 };
+	struct i2c_msg msg[] = {
+		{
+			.addr = state->tuner_address,
+			.flags = 0,
+			.buf = b0,
+			.len = 1
+		}, {
+			.addr = state->tuner_address,
+			.flags = I2C_M_RD,
+			.buf = b1,
+			.len = 1
+		}
+	};
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	if (ret != 2) {
+		printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", __func__, reg, ret);
+		return ret;
+	}
+
+	return b1[0];
+}
+
+static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
+{
+	struct ts2020_state *state = fe->tuner_priv;
+
+	u8 buf[] = { reg, data };
+	struct i2c_msg msg = { .addr = state->tuner_address,
+		.flags = 0, .buf = buf, .len = 2 };
+	int err;
+
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 1);
+
+	err = i2c_transfer(state->i2c, &msg, 1);
+
+	if (fe->ops.i2c_gate_ctrl)
+		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	if (err != 1) {
+		printk(KERN_ERR "%s: writereg error(err == %i, reg == 0x%02x,"
+			 " value == 0x%02x)\n", __func__, err, reg, data);
+		return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+static int ts2020_init(struct dvb_frontend *fe)
+{
+	ts2020_writereg(fe, 0x42, 0x73);
+	ts2020_writereg(fe, 0x05, 0x01);
+	ts2020_writereg(fe, 0x62, 0xf5);
+	return 0;
+}
+
+static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+	u16 ndiv, div4;
+
+	div4 = (ts2020_readreg(fe, 0x10) & 0x10) >> 4;
+
+	ndiv = ts2020_readreg(fe, 0x01);
+	ndiv &= 0x0f;
+	ndiv <<= 8;
+	ndiv |= ts2020_readreg(fe, 0x02);
+
+	/* actual tuned frequency, i.e. including the offset */
+	*frequency = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
+		/ (6 + 8) / (div4 + 1) / 2;
+
+	return 0;
+}
+
+static int ts2020_set_params(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+	u8 mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf, div4;
+	u16 value, ndiv;
+	u32 srate = 0, f3db;
+
+	ts2020_init(fe);
+
+	/* unknown */
+	ts2020_writereg(fe, 0x07, 0x02);
+	ts2020_writereg(fe, 0x10, 0x00);
+	ts2020_writereg(fe, 0x60, 0x79);
+	ts2020_writereg(fe, 0x08, 0x01);
+	ts2020_writereg(fe, 0x00, 0x01);
+	div4 = 0;
+
+	/* calculate and set freq divider */
+	if (c->frequency < 1146000) {
+		ts2020_writereg(fe, 0x10, 0x11);
+		div4 = 1;
+		ndiv = ((c->frequency * (6 + 8) * 4) +
+				(TS2020_XTAL_FREQ / 2)) /
+				TS2020_XTAL_FREQ - 1024;
+	} else {
+		ts2020_writereg(fe, 0x10, 0x01);
+		ndiv = ((c->frequency * (6 + 8) * 2) +
+				(TS2020_XTAL_FREQ / 2)) /
+				TS2020_XTAL_FREQ - 1024;
+	}
+
+	ts2020_writereg(fe, 0x01, (ndiv & 0x0f00) >> 8);
+	ts2020_writereg(fe, 0x02, ndiv & 0x00ff);
+
+	/* set pll */
+	ts2020_writereg(fe, 0x03, 0x06);
+	ts2020_writereg(fe, 0x51, 0x0f);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x10);
+	ts2020_writereg(fe, 0x50, 0x00);
+	msleep(5);
+
+	/* unknown */
+	ts2020_writereg(fe, 0x51, 0x17);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x08);
+	ts2020_writereg(fe, 0x50, 0x00);
+	msleep(5);
+
+	value = ts2020_readreg(fe, 0x3d);
+	value &= 0x0f;
+	if ((value > 4) && (value < 15)) {
+		value -= 3;
+		if (value < 4)
+			value = 4;
+		value = ((value << 3) | 0x01) & 0x79;
+	}
+
+	ts2020_writereg(fe, 0x60, value);
+	ts2020_writereg(fe, 0x51, 0x17);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x08);
+	ts2020_writereg(fe, 0x50, 0x00);
+
+	/* set low-pass filter period */
+	ts2020_writereg(fe, 0x04, 0x2e);
+	ts2020_writereg(fe, 0x51, 0x1b);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x04);
+	ts2020_writereg(fe, 0x50, 0x00);
+	msleep(5);
+
+	srate = c->symbol_rate / 1000;
+
+	f3db = (srate << 2) / 5 + 2000;
+	if (srate < 5000)
+		f3db += 3000;
+	if (f3db < 7000)
+		f3db = 7000;
+	if (f3db > 40000)
+		f3db = 40000;
+
+	/* set low-pass filter baseband */
+	value = ts2020_readreg(fe, 0x26);
+	mlpf = 0x2e * 207 / ((value << 1) + 151);
+	mlpf_max = mlpf * 135 / 100;
+	mlpf_min = mlpf * 78 / 100;
+	if (mlpf_max > 63)
+		mlpf_max = 63;
+
+	/* rounded to the closest integer */
+	nlpf = ((mlpf * f3db * 1000) + (2766 * TS2020_XTAL_FREQ / 2))
+			/ (2766 * TS2020_XTAL_FREQ);
+	if (nlpf > 23)
+		nlpf = 23;
+	if (nlpf < 1)
+		nlpf = 1;
+
+	/* rounded to the closest integer */
+	mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
+			(1000 * f3db / 2)) / (1000 * f3db);
+
+	if (mlpf_new < mlpf_min) {
+		nlpf++;
+		mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
+				(1000 * f3db / 2)) / (1000 * f3db);
+	}
+
+	if (mlpf_new > mlpf_max)
+		mlpf_new = mlpf_max;
+
+	ts2020_writereg(fe, 0x04, mlpf_new);
+	ts2020_writereg(fe, 0x06, nlpf);
+	ts2020_writereg(fe, 0x51, 0x1b);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x04);
+	ts2020_writereg(fe, 0x50, 0x00);
+	msleep(5);
+
+	/* unknown */
+	ts2020_writereg(fe, 0x51, 0x1e);
+	ts2020_writereg(fe, 0x51, 0x1f);
+	ts2020_writereg(fe, 0x50, 0x01);
+	ts2020_writereg(fe, 0x50, 0x00);
+	msleep(60);
+
+	return 0;
+}
+
+static int ts2020_release(struct dvb_frontend *fe)
+{
+	struct ts2020_state *state = fe->tuner_priv;
+
+	fe->tuner_priv = NULL;
+	kfree(state);
+
+	return 0;
+}
+
+int ts2020_get_signal_strength(struct dvb_frontend *fe,
+	u16 *signal_strength)
+{
+	u16 sig_reading, sig_strength;
+	u8 rfgain, bbgain;
+
+	rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
+	bbgain = ts2020_readreg(fe, 0x21) & 0x1f;
+
+	if (rfgain > 15)
+		rfgain = 15;
+	if (bbgain > 13)
+		bbgain = 13;
+
+	sig_reading = rfgain * 2 + bbgain * 3;
+
+	sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;
+
+	/* cook the value to be suitable for szap-s2 human readable output */
+	*signal_strength = sig_strength * 1000;
+
+	return 0;
+}
+
+static struct dvb_tuner_ops ts2020_ops = {
+	.info = {
+		.name = "Montage Technology TS2020 Silicon Tuner",
+		.frequency_min = 950000,
+		.frequency_max = 2150000,
+	},
+
+	.init = ts2020_init,
+	.release = ts2020_release,
+	.set_params = ts2020_set_params,
+	.get_frequency = ts2020_get_frequency,
+	.get_rf_strength = ts2020_get_signal_strength
+};
+
+struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
+	const struct ts2020_config *config, struct i2c_adapter *i2c)
+{
+	struct ts2020_state *state = NULL;
+
+	/* allocate memory for the internal state */
+	state = kzalloc(sizeof(struct ts2020_state), GFP_KERNEL);
+	if (!state)
+		return NULL;
+
+	/* setup the state */
+	state->tuner_address = config->tuner_address;
+	state->i2c = i2c;
+	fe->tuner_priv = state;
+	fe->ops.tuner_ops = ts2020_ops;
+	fe->ops.read_signal_strength = fe->ops.tuner_ops.get_rf_strength;
+
+	return fe;
+}
+EXPORT_SYMBOL(ts2020_attach);
+
+MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
+MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
+MODULE_LICENSE("GPL");