2 Montage Technology TS2020 - Silicon Tuner driver
3 Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
5 Copyright (C) 2009-2012 TurboSight.com
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "dvb_frontend.h"
25 #define TS2020_XTAL_FREQ 27000 /* in kHz */
26 #define FREQ_OFFSET_LOW_SYM_RATE 3000
31 struct i2c_adapter *i2c;
36 static int ts2020_release(struct dvb_frontend *fe)
38 kfree(fe->tuner_priv);
39 fe->tuner_priv = NULL;
43 static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
45 struct ts2020_priv *priv = fe->tuner_priv;
46 u8 buf[] = { reg, data };
47 struct i2c_msg msg[] = {
49 .addr = priv->i2c_address,
57 if (fe->ops.i2c_gate_ctrl)
58 fe->ops.i2c_gate_ctrl(fe, 1);
60 err = i2c_transfer(priv->i2c, msg, 1);
63 "%s: writereg error(err == %i, reg == 0x%02x, value == 0x%02x)\n",
64 __func__, err, reg, data);
68 if (fe->ops.i2c_gate_ctrl)
69 fe->ops.i2c_gate_ctrl(fe, 0);
74 static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
76 struct ts2020_priv *priv = fe->tuner_priv;
80 struct i2c_msg msg[] = {
82 .addr = priv->i2c_address,
87 .addr = priv->i2c_address,
94 if (fe->ops.i2c_gate_ctrl)
95 fe->ops.i2c_gate_ctrl(fe, 1);
97 ret = i2c_transfer(priv->i2c, msg, 2);
100 printk(KERN_ERR "%s: reg=0x%x(error=%d)\n",
105 if (fe->ops.i2c_gate_ctrl)
106 fe->ops.i2c_gate_ctrl(fe, 0);
111 static int ts2020_sleep(struct dvb_frontend *fe)
113 struct ts2020_priv *priv = fe->tuner_priv;
115 u8 buf[] = { 10, 0 };
116 struct i2c_msg msg = {
117 .addr = priv->i2c_address,
123 if (fe->ops.i2c_gate_ctrl)
124 fe->ops.i2c_gate_ctrl(fe, 1);
126 ret = i2c_transfer(priv->i2c, &msg, 1);
128 printk(KERN_ERR "%s: i2c error\n", __func__);
130 if (fe->ops.i2c_gate_ctrl)
131 fe->ops.i2c_gate_ctrl(fe, 0);
133 return (ret == 1) ? 0 : ret;
136 static int ts2020_init(struct dvb_frontend *fe)
138 struct ts2020_priv *priv = fe->tuner_priv;
140 ts2020_writereg(fe, 0x42, 0x73);
141 ts2020_writereg(fe, 0x05, priv->clk_out_div);
142 ts2020_writereg(fe, 0x20, 0x27);
143 ts2020_writereg(fe, 0x07, 0x02);
144 ts2020_writereg(fe, 0x11, 0xff);
145 ts2020_writereg(fe, 0x60, 0xf9);
146 ts2020_writereg(fe, 0x08, 0x01);
147 ts2020_writereg(fe, 0x00, 0x41);
152 static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
155 ret = ts2020_writereg(fe, 0x51, 0x1f - offset);
156 ret |= ts2020_writereg(fe, 0x51, 0x1f);
157 ret |= ts2020_writereg(fe, 0x50, offset);
158 ret |= ts2020_writereg(fe, 0x50, 0x00);
163 static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
167 reg = ts2020_readreg(fe, 0x3d);
171 else if (reg == 0x16)
176 ts2020_writereg(fe, 0x60, reg);
177 reg = ts2020_tuner_gate_ctrl(fe, 0x08);
182 static int ts2020_set_params(struct dvb_frontend *fe)
184 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
185 struct ts2020_priv *priv = fe->tuner_priv;
187 u32 frequency = c->frequency;
189 u32 symbol_rate = (c->symbol_rate / 1000);
191 u16 value, ndiv, lpf_coeff;
192 u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
193 u8 lo = 0x01, div4 = 0x0;
195 /* Calculate frequency divider */
196 if (frequency < 1060000) {
199 ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ;
201 ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ;
202 ndiv = ndiv + ndiv % 2;
205 ret = ts2020_writereg(fe, 0x10, 0x80 | lo);
207 /* Set frequency divider */
208 ret |= ts2020_writereg(fe, 0x01, (ndiv >> 8) & 0xf);
209 ret |= ts2020_writereg(fe, 0x02, ndiv & 0xff);
211 ret |= ts2020_writereg(fe, 0x03, 0x06);
212 ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
216 /* Tuner Frequency Range */
217 ret = ts2020_writereg(fe, 0x10, lo);
219 ret |= ts2020_tuner_gate_ctrl(fe, 0x08);
222 ret |= ts2020_set_tuner_rf(fe);
224 gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
225 ret |= ts2020_writereg(fe, 0x04, gdiv28 & 0xff);
226 ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
230 value = ts2020_readreg(fe, 0x26);
232 f3db = (symbol_rate * 135) / 200 + 2000;
233 f3db += FREQ_OFFSET_LOW_SYM_RATE;
239 gdiv28 = gdiv28 * 207 / (value * 2 + 151);
240 mlpf_max = gdiv28 * 135 / 100;
241 mlpf_min = gdiv28 * 78 / 100;
247 nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
248 (TS2020_XTAL_FREQ / 1000) + 1) / 2;
254 lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
255 * lpf_coeff * 2 / f3db + 1) / 2;
257 if (lpf_mxdiv < mlpf_min) {
259 lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
260 * lpf_coeff * 2 / f3db + 1) / 2;
263 if (lpf_mxdiv > mlpf_max)
264 lpf_mxdiv = mlpf_max;
266 ret = ts2020_writereg(fe, 0x04, lpf_mxdiv);
267 ret |= ts2020_writereg(fe, 0x06, nlpf);
269 ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
271 ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
274 /* calculate offset assuming 96000kHz*/
275 offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
276 / (6 + 8) / (div4 + 1) / 2;
278 priv->frequency = offset_khz;
280 return (ret < 0) ? -EINVAL : 0;
283 static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
285 struct ts2020_priv *priv = fe->tuner_priv;
286 *frequency = priv->frequency;
290 /* read TS2020 signal strength */
291 static int ts2020_read_signal_strength(struct dvb_frontend *fe,
292 u16 *signal_strength)
294 u16 sig_reading, sig_strength;
297 rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
298 bbgain = ts2020_readreg(fe, 0x21) & 0x1f;
305 sig_reading = rfgain * 2 + bbgain * 3;
307 sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;
309 /* cook the value to be suitable for szap-s2 human readable output */
310 *signal_strength = sig_strength * 1000;
315 static struct dvb_tuner_ops ts2020_tuner_ops = {
318 .frequency_min = 950000,
319 .frequency_max = 2150000
322 .release = ts2020_release,
323 .sleep = ts2020_sleep,
324 .set_params = ts2020_set_params,
325 .get_frequency = ts2020_get_frequency,
326 .get_rf_strength = ts2020_read_signal_strength,
329 struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
330 const struct ts2020_config *config,
331 struct i2c_adapter *i2c)
333 struct ts2020_priv *priv = NULL;
336 priv = kzalloc(sizeof(struct ts2020_priv), GFP_KERNEL);
340 priv->i2c_address = config->tuner_address;
342 priv->clk_out_div = config->clk_out_div;
343 fe->tuner_priv = priv;
345 /* Wake Up the tuner */
346 if ((0x03 & ts2020_readreg(fe, 0x00)) == 0x00) {
347 ts2020_writereg(fe, 0x00, 0x01);
351 ts2020_writereg(fe, 0x00, 0x03);
354 /* Check the tuner version */
355 buf = ts2020_readreg(fe, 0x00);
356 if ((buf == 0x01) || (buf == 0x41) || (buf == 0x81))
357 printk(KERN_INFO "%s: Find tuner TS2020!\n", __func__);
359 printk(KERN_ERR "%s: Read tuner reg[0] = %d\n", __func__, buf);
364 memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
365 sizeof(struct dvb_tuner_ops));
369 EXPORT_SYMBOL(ts2020_attach);
371 MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
372 MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
373 MODULE_LICENSE("GPL");