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6fef4fc7 KD |
1 | /* |
2 | Montage Technology TS2020 - Silicon Tuner driver | |
3 | Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com> | |
4 | ||
5 | Copyright (C) 2009-2012 TurboSight.com | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. | |
20 | */ | |
21 | ||
22 | #include "dvb_frontend.h" | |
23 | #include "ts2020.h" | |
24 | ||
25 | #define TS2020_XTAL_FREQ 27000 /* in kHz */ | |
b858c331 | 26 | #define FREQ_OFFSET_LOW_SYM_RATE 3000 |
6fef4fc7 | 27 | |
b858c331 IL |
28 | struct ts2020_priv { |
29 | /* i2c details */ | |
30 | int i2c_address; | |
6fef4fc7 | 31 | struct i2c_adapter *i2c; |
b858c331 IL |
32 | u8 clk_out_div; |
33 | u32 frequency; | |
6fef4fc7 KD |
34 | }; |
35 | ||
b858c331 | 36 | static int ts2020_release(struct dvb_frontend *fe) |
6fef4fc7 | 37 | { |
b858c331 IL |
38 | kfree(fe->tuner_priv); |
39 | fe->tuner_priv = NULL; | |
40 | return 0; | |
41 | } | |
42 | ||
43 | static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data) | |
44 | { | |
45 | struct ts2020_priv *priv = fe->tuner_priv; | |
46 | u8 buf[] = { reg, data }; | |
47 | struct i2c_msg msg[] = { | |
48 | { | |
49 | .addr = priv->i2c_address, | |
50 | .flags = 0, | |
51 | .buf = buf, | |
52 | .len = 2 | |
53 | } | |
54 | }; | |
55 | int err; | |
56 | ||
57 | if (fe->ops.i2c_gate_ctrl) | |
58 | fe->ops.i2c_gate_ctrl(fe, 1); | |
59 | ||
60 | err = i2c_transfer(priv->i2c, msg, 1); | |
61 | if (err != 1) { | |
62 | printk(KERN_ERR | |
63 | "%s: writereg error(err == %i, reg == 0x%02x, value == 0x%02x)\n", | |
64 | __func__, err, reg, data); | |
65 | return -EREMOTEIO; | |
66 | } | |
6fef4fc7 | 67 | |
b858c331 IL |
68 | if (fe->ops.i2c_gate_ctrl) |
69 | fe->ops.i2c_gate_ctrl(fe, 0); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static int ts2020_readreg(struct dvb_frontend *fe, u8 reg) | |
75 | { | |
76 | struct ts2020_priv *priv = fe->tuner_priv; | |
6fef4fc7 KD |
77 | int ret; |
78 | u8 b0[] = { reg }; | |
79 | u8 b1[] = { 0 }; | |
80 | struct i2c_msg msg[] = { | |
81 | { | |
b858c331 | 82 | .addr = priv->i2c_address, |
6fef4fc7 KD |
83 | .flags = 0, |
84 | .buf = b0, | |
85 | .len = 1 | |
86 | }, { | |
b858c331 | 87 | .addr = priv->i2c_address, |
6fef4fc7 KD |
88 | .flags = I2C_M_RD, |
89 | .buf = b1, | |
90 | .len = 1 | |
91 | } | |
92 | }; | |
93 | ||
94 | if (fe->ops.i2c_gate_ctrl) | |
95 | fe->ops.i2c_gate_ctrl(fe, 1); | |
96 | ||
b858c331 | 97 | ret = i2c_transfer(priv->i2c, msg, 2); |
6fef4fc7 KD |
98 | |
99 | if (ret != 2) { | |
b858c331 IL |
100 | printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", |
101 | __func__, reg, ret); | |
6fef4fc7 KD |
102 | return ret; |
103 | } | |
104 | ||
b858c331 IL |
105 | if (fe->ops.i2c_gate_ctrl) |
106 | fe->ops.i2c_gate_ctrl(fe, 0); | |
107 | ||
6fef4fc7 KD |
108 | return b1[0]; |
109 | } | |
110 | ||
b858c331 | 111 | static int ts2020_sleep(struct dvb_frontend *fe) |
6fef4fc7 | 112 | { |
b858c331 IL |
113 | struct ts2020_priv *priv = fe->tuner_priv; |
114 | int ret; | |
115 | u8 buf[] = { 10, 0 }; | |
116 | struct i2c_msg msg = { | |
117 | .addr = priv->i2c_address, | |
118 | .flags = 0, | |
119 | .buf = buf, | |
120 | .len = 2 | |
121 | }; | |
6fef4fc7 KD |
122 | |
123 | if (fe->ops.i2c_gate_ctrl) | |
124 | fe->ops.i2c_gate_ctrl(fe, 1); | |
125 | ||
b858c331 IL |
126 | ret = i2c_transfer(priv->i2c, &msg, 1); |
127 | if (ret != 1) | |
128 | printk(KERN_ERR "%s: i2c error\n", __func__); | |
6fef4fc7 KD |
129 | |
130 | if (fe->ops.i2c_gate_ctrl) | |
131 | fe->ops.i2c_gate_ctrl(fe, 0); | |
132 | ||
b858c331 | 133 | return (ret == 1) ? 0 : ret; |
6fef4fc7 KD |
134 | } |
135 | ||
136 | static int ts2020_init(struct dvb_frontend *fe) | |
137 | { | |
b858c331 IL |
138 | struct ts2020_priv *priv = fe->tuner_priv; |
139 | ||
6fef4fc7 | 140 | ts2020_writereg(fe, 0x42, 0x73); |
b858c331 IL |
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); | |
148 | ||
6fef4fc7 KD |
149 | return 0; |
150 | } | |
151 | ||
b858c331 | 152 | static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset) |
6fef4fc7 | 153 | { |
b858c331 IL |
154 | int ret; |
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); | |
159 | msleep(20); | |
160 | return ret; | |
161 | } | |
6fef4fc7 | 162 | |
b858c331 IL |
163 | static int ts2020_set_tuner_rf(struct dvb_frontend *fe) |
164 | { | |
165 | int reg; | |
6fef4fc7 | 166 | |
b858c331 IL |
167 | reg = ts2020_readreg(fe, 0x3d); |
168 | reg &= 0x7f; | |
169 | if (reg < 0x16) | |
170 | reg = 0xa1; | |
171 | else if (reg == 0x16) | |
172 | reg = 0x99; | |
173 | else | |
174 | reg = 0xf9; | |
6fef4fc7 | 175 | |
b858c331 IL |
176 | ts2020_writereg(fe, 0x60, reg); |
177 | reg = ts2020_tuner_gate_ctrl(fe, 0x08); | |
6fef4fc7 | 178 | |
b858c331 | 179 | return reg; |
6fef4fc7 KD |
180 | } |
181 | ||
182 | static int ts2020_set_params(struct dvb_frontend *fe) | |
183 | { | |
184 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; | |
9898df64 | 185 | struct ts2020_priv *priv = fe->tuner_priv; |
b858c331 IL |
186 | int ret; |
187 | u32 frequency = c->frequency; | |
188 | s32 offset_khz; | |
189 | u32 symbol_rate = (c->symbol_rate / 1000); | |
190 | u32 f3db, gdiv28; | |
191 | u16 value, ndiv, lpf_coeff; | |
192 | u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf; | |
193 | u8 lo = 0x01, div4 = 0x0; | |
194 | ||
195 | /* Calculate frequency divider */ | |
196 | if (frequency < 1060000) { | |
197 | lo |= 0x10; | |
198 | div4 = 0x1; | |
199 | ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ; | |
200 | } else | |
201 | ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ; | |
202 | ndiv = ndiv + ndiv % 2; | |
203 | ndiv = ndiv - 1024; | |
204 | ||
205 | ret = ts2020_writereg(fe, 0x10, 0x80 | lo); | |
206 | ||
207 | /* Set frequency divider */ | |
208 | ret |= ts2020_writereg(fe, 0x01, (ndiv >> 8) & 0xf); | |
209 | ret |= ts2020_writereg(fe, 0x02, ndiv & 0xff); | |
210 | ||
211 | ret |= ts2020_writereg(fe, 0x03, 0x06); | |
212 | ret |= ts2020_tuner_gate_ctrl(fe, 0x10); | |
213 | if (ret < 0) | |
214 | return -ENODEV; | |
215 | ||
216 | /* Tuner Frequency Range */ | |
217 | ret = ts2020_writereg(fe, 0x10, lo); | |
218 | ||
219 | ret |= ts2020_tuner_gate_ctrl(fe, 0x08); | |
220 | ||
221 | /* Tuner RF */ | |
222 | ret |= ts2020_set_tuner_rf(fe); | |
223 | ||
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); | |
227 | if (ret < 0) | |
228 | return -ENODEV; | |
6fef4fc7 | 229 | |
b858c331 | 230 | value = ts2020_readreg(fe, 0x26); |
6fef4fc7 | 231 | |
b858c331 IL |
232 | f3db = (symbol_rate * 135) / 200 + 2000; |
233 | f3db += FREQ_OFFSET_LOW_SYM_RATE; | |
6fef4fc7 KD |
234 | if (f3db < 7000) |
235 | f3db = 7000; | |
236 | if (f3db > 40000) | |
237 | f3db = 40000; | |
238 | ||
b858c331 IL |
239 | gdiv28 = gdiv28 * 207 / (value * 2 + 151); |
240 | mlpf_max = gdiv28 * 135 / 100; | |
241 | mlpf_min = gdiv28 * 78 / 100; | |
6fef4fc7 KD |
242 | if (mlpf_max > 63) |
243 | mlpf_max = 63; | |
244 | ||
b858c331 IL |
245 | lpf_coeff = 2766; |
246 | ||
247 | nlpf = (f3db * gdiv28 * 2 / lpf_coeff / | |
248 | (TS2020_XTAL_FREQ / 1000) + 1) / 2; | |
6fef4fc7 KD |
249 | if (nlpf > 23) |
250 | nlpf = 23; | |
251 | if (nlpf < 1) | |
252 | nlpf = 1; | |
253 | ||
b858c331 IL |
254 | lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000) |
255 | * lpf_coeff * 2 / f3db + 1) / 2; | |
6fef4fc7 | 256 | |
b858c331 | 257 | if (lpf_mxdiv < mlpf_min) { |
6fef4fc7 | 258 | nlpf++; |
b858c331 IL |
259 | lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000) |
260 | * lpf_coeff * 2 / f3db + 1) / 2; | |
6fef4fc7 KD |
261 | } |
262 | ||
b858c331 IL |
263 | if (lpf_mxdiv > mlpf_max) |
264 | lpf_mxdiv = mlpf_max; | |
6fef4fc7 | 265 | |
b858c331 IL |
266 | ret = ts2020_writereg(fe, 0x04, lpf_mxdiv); |
267 | ret |= ts2020_writereg(fe, 0x06, nlpf); | |
6fef4fc7 | 268 | |
b858c331 | 269 | ret |= ts2020_tuner_gate_ctrl(fe, 0x04); |
6fef4fc7 | 270 | |
b858c331 | 271 | ret |= ts2020_tuner_gate_ctrl(fe, 0x01); |
6fef4fc7 | 272 | |
b858c331 IL |
273 | msleep(80); |
274 | /* calculate offset assuming 96000kHz*/ | |
275 | offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ | |
276 | / (6 + 8) / (div4 + 1) / 2; | |
6fef4fc7 | 277 | |
b858c331 IL |
278 | priv->frequency = offset_khz; |
279 | ||
280 | return (ret < 0) ? -EINVAL : 0; | |
281 | } | |
6fef4fc7 | 282 | |
b858c331 IL |
283 | static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
284 | { | |
285 | struct ts2020_priv *priv = fe->tuner_priv; | |
286 | *frequency = priv->frequency; | |
6fef4fc7 KD |
287 | return 0; |
288 | } | |
289 | ||
b858c331 IL |
290 | /* read TS2020 signal strength */ |
291 | static int ts2020_read_signal_strength(struct dvb_frontend *fe, | |
292 | u16 *signal_strength) | |
6fef4fc7 KD |
293 | { |
294 | u16 sig_reading, sig_strength; | |
295 | u8 rfgain, bbgain; | |
296 | ||
297 | rfgain = ts2020_readreg(fe, 0x3d) & 0x1f; | |
298 | bbgain = ts2020_readreg(fe, 0x21) & 0x1f; | |
299 | ||
300 | if (rfgain > 15) | |
301 | rfgain = 15; | |
302 | if (bbgain > 13) | |
303 | bbgain = 13; | |
304 | ||
305 | sig_reading = rfgain * 2 + bbgain * 3; | |
306 | ||
307 | sig_strength = 40 + (64 - sig_reading) * 50 / 64 ; | |
308 | ||
309 | /* cook the value to be suitable for szap-s2 human readable output */ | |
310 | *signal_strength = sig_strength * 1000; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
b858c331 | 315 | static struct dvb_tuner_ops ts2020_tuner_ops = { |
6fef4fc7 | 316 | .info = { |
b858c331 | 317 | .name = "TS2020", |
6fef4fc7 | 318 | .frequency_min = 950000, |
b858c331 | 319 | .frequency_max = 2150000 |
6fef4fc7 | 320 | }, |
6fef4fc7 KD |
321 | .init = ts2020_init, |
322 | .release = ts2020_release, | |
b858c331 | 323 | .sleep = ts2020_sleep, |
6fef4fc7 KD |
324 | .set_params = ts2020_set_params, |
325 | .get_frequency = ts2020_get_frequency, | |
b858c331 | 326 | .get_rf_strength = ts2020_read_signal_strength, |
6fef4fc7 KD |
327 | }; |
328 | ||
329 | struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe, | |
b858c331 IL |
330 | const struct ts2020_config *config, |
331 | struct i2c_adapter *i2c) | |
6fef4fc7 | 332 | { |
b858c331 IL |
333 | struct ts2020_priv *priv = NULL; |
334 | u8 buf; | |
335 | ||
336 | priv = kzalloc(sizeof(struct ts2020_priv), GFP_KERNEL); | |
337 | if (priv == NULL) | |
338 | return NULL; | |
6fef4fc7 | 339 | |
b858c331 IL |
340 | priv->i2c_address = config->tuner_address; |
341 | priv->i2c = i2c; | |
342 | priv->clk_out_div = config->clk_out_div; | |
343 | fe->tuner_priv = priv; | |
344 | ||
345 | /* Wake Up the tuner */ | |
346 | if ((0x03 & ts2020_readreg(fe, 0x00)) == 0x00) { | |
347 | ts2020_writereg(fe, 0x00, 0x01); | |
348 | msleep(2); | |
349 | } | |
350 | ||
351 | ts2020_writereg(fe, 0x00, 0x03); | |
352 | msleep(2); | |
353 | ||
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__); | |
358 | else { | |
359 | printk(KERN_ERR "%s: Read tuner reg[0] = %d\n", __func__, buf); | |
360 | kfree(priv); | |
6fef4fc7 | 361 | return NULL; |
b858c331 | 362 | } |
6fef4fc7 | 363 | |
b858c331 IL |
364 | memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops, |
365 | sizeof(struct dvb_tuner_ops)); | |
6fef4fc7 KD |
366 | |
367 | return fe; | |
368 | } | |
369 | EXPORT_SYMBOL(ts2020_attach); | |
370 | ||
371 | MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>"); | |
372 | MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module"); | |
373 | MODULE_LICENSE("GPL"); |