--- /dev/null
+/*
+ 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");
projects / platform / kernel / linux-stable.git / commitdiff