1 /*
2 * at76c651.c
3 *
4 * Atmel DVB-C Frontend Driver (at76c651/tua6010xs)
5 *
6 * Copyright (C) 2001 fnbrd <fnbrd@gmx.de>
7 * & 2002-2004 Andreas Oberritter <obi@linuxtv.org>
8 * & 2003 Wolfram Joost <dbox2@frokaschwei.de>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 *
24 * AT76C651
25 * http://www.nalanda.nitc.ac.in/industry/datasheets/atmel/acrobat/doc1293.pdf
26 * http://www.atmel.com/atmel/acrobat/doc1320.pdf
27 */
28
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/kernel.h>
33 #include <linux/string.h>
34 #include <linux/slab.h>
35 #include <linux/bitops.h>
36 #include "dvb_frontend.h"
37 #include "at76c651.h"
38
39
40 struct at76c651_state {
41
42 struct i2c_adapter* i2c;
43
44 struct dvb_frontend_ops ops;
45
46 const struct at76c651_config* config;
47
48 struct dvb_frontend frontend;
49
50 /* revision of the chip */
51 u8 revision;
52
53 /* last QAM value set */
54 u8 qam;
55 };
56
57 static int debug;
58 #define dprintk(args...) \
59 do { \
60 if (debug) printk(KERN_DEBUG "at76c651: " args); \
61 } while (0)
62
63
64 #if ! defined(__powerpc__)
65 static __inline__ int __ilog2(unsigned long x)
66 {
67 int i;
68
69 if (x == 0)
70 return -1;
71
72 for (i = 0; x != 0; i++)
73 x >>= 1;
74
75 return i - 1;
76 }
77 #endif
78
79 static int at76c651_writereg(struct at76c651_state* state, u8 reg, u8 data)
80 {
81 int ret;
82 u8 buf[] = { reg, data };
83 struct i2c_msg msg =
84 { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
85
86 ret = i2c_transfer(state->i2c, &msg, 1);
87
88 if (ret != 1)
89 dprintk("%s: writereg error "
90 "(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
91 __FUNCTION__, reg, data, ret);
92
93 msleep(10);
94
95 return (ret != 1) ? -EREMOTEIO : 0;
96 }
97
98 static u8 at76c651_readreg(struct at76c651_state* state, u8 reg)
99 {
100 int ret;
101 u8 val;
102 struct i2c_msg msg[] = {
103 { .addr = state->config->demod_address, .flags = 0, .buf = ®, .len = 1 },
104 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = &val, .len = 1 }
105 };
106
107 ret = i2c_transfer(state->i2c, msg, 2);
108
109 if (ret != 2)
110 dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
111
112 return val;
113 }
114
115 static int at76c651_reset(struct at76c651_state* state)
116 {
117 return at76c651_writereg(state, 0x07, 0x01);
118 }
119
120 static void at76c651_disable_interrupts(struct at76c651_state* state)
121 {
122 at76c651_writereg(state, 0x0b, 0x00);
123 }
124
125 static int at76c651_set_auto_config(struct at76c651_state *state)
126 {
127 /*
128 * Autoconfig
129 */
130
131 at76c651_writereg(state, 0x06, 0x01);
132
133 /*
134 * Performance optimizations, should be done after autoconfig
135 */
136
137 at76c651_writereg(state, 0x10, 0x06);
138 at76c651_writereg(state, 0x11, ((state->qam == 5) || (state->qam == 7)) ? 0x12 : 0x10);
139 at76c651_writereg(state, 0x15, 0x28);
140 at76c651_writereg(state, 0x20, 0x09);
141 at76c651_writereg(state, 0x24, ((state->qam == 5) || (state->qam == 7)) ? 0xC0 : 0x90);
142 at76c651_writereg(state, 0x30, 0x90);
143 if (state->qam == 5)
144 at76c651_writereg(state, 0x35, 0x2A);
145
146 /*
147 * Initialize A/D-converter
148 */
149
150 if (state->revision == 0x11) {
151 at76c651_writereg(state, 0x2E, 0x38);
152 at76c651_writereg(state, 0x2F, 0x13);
153 }
154
155 at76c651_disable_interrupts(state);
156
157 /*
158 * Restart operation
159 */
160
161 at76c651_reset(state);
162
163 return 0;
164 }
165
166 static void at76c651_set_bbfreq(struct at76c651_state* state)
167 {
168 at76c651_writereg(state, 0x04, 0x3f);
169 at76c651_writereg(state, 0x05, 0xee);
170 }
171
172 static int at76c651_set_symbol_rate(struct at76c651_state* state, u32 symbol_rate)
173 {
174 u8 exponent;
175 u32 mantissa;
176
177 if (symbol_rate > 9360000)
178 return -EINVAL;
179
180 /*
181 * FREF = 57800 kHz
182 * exponent = 10 + floor (log2(symbol_rate / FREF))
183 * mantissa = (symbol_rate / FREF) * (1 << (30 - exponent))
184 */
185
186 exponent = __ilog2((symbol_rate << 4) / 903125);
187 mantissa = ((symbol_rate / 3125) * (1 << (24 - exponent))) / 289;
188
189 at76c651_writereg(state, 0x00, mantissa >> 13);
190 at76c651_writereg(state, 0x01, mantissa >> 5);
191 at76c651_writereg(state, 0x02, (mantissa << 3) | exponent);
192
193 return 0;
194 }
195
196 static int at76c651_set_qam(struct at76c651_state *state, fe_modulation_t qam)
197 {
198 switch (qam) {
199 case QPSK:
200 state->qam = 0x02;
201 break;
202 case QAM_16:
203 state->qam = 0x04;
204 break;
205 case QAM_32:
206 state->qam = 0x05;
207 break;
208 case QAM_64:
209 state->qam = 0x06;
210 break;
211 case QAM_128:
212 state->qam = 0x07;
213 break;
214 case QAM_256:
215 state->qam = 0x08;
216 break;
217 #if 0
218 case QAM_512:
219 state->qam = 0x09;
220 break;
221 case QAM_1024:
222 state->qam = 0x0A;
223 break;
224 #endif
225 default:
226 return -EINVAL;
227
228 }
229
230 return at76c651_writereg(state, 0x03, state->qam);
231 }
232
233 static int at76c651_set_inversion(struct at76c651_state* state, fe_spectral_inversion_t inversion)
234 {
235 u8 feciqinv = at76c651_readreg(state, 0x60);
236
237 switch (inversion) {
238 case INVERSION_OFF:
239 feciqinv |= 0x02;
240 feciqinv &= 0xFE;
241 break;
242
243 case INVERSION_ON:
244 feciqinv |= 0x03;
245 break;
246
247 case INVERSION_AUTO:
248 feciqinv &= 0xFC;
249 break;
250
251 default:
252 return -EINVAL;
253 }
254
255 return at76c651_writereg(state, 0x60, feciqinv);
256 }
257
258
259
260
261
262
263
264
265
266 static int at76c651_set_parameters(struct dvb_frontend* fe,
267 struct dvb_frontend_parameters *p)
268 {
269 int ret;
270 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
271
272 at76c651_writereg(state, 0x0c, 0xc3);
273 state->config->pll_set(fe, p);
274 at76c651_writereg(state, 0x0c, 0xc2);
275
276 if ((ret = at76c651_set_symbol_rate(state, p->u.qam.symbol_rate)))
277 return ret;
278
279 if ((ret = at76c651_set_inversion(state, p->inversion)))
280 return ret;
281
282 return at76c651_set_auto_config(state);
283 }
284
285 static int at76c651_set_defaults(struct dvb_frontend* fe)
286 {
287 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
288
289 at76c651_set_symbol_rate(state, 6900000);
290 at76c651_set_qam(state, QAM_64);
291 at76c651_set_bbfreq(state);
292 at76c651_set_auto_config(state);
293
294 if (state->config->pll_init) {
295 at76c651_writereg(state, 0x0c, 0xc3);
296 state->config->pll_init(fe);
297 at76c651_writereg(state, 0x0c, 0xc2);
298 }
299
300 return 0;
301 }
302
303 static int at76c651_read_status(struct dvb_frontend* fe, fe_status_t* status)
304 {
305 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
306 u8 sync;
307
308 /*
309 * Bits: FEC, CAR, EQU, TIM, AGC2, AGC1, ADC, PLL (PLL=0)
310 */
311 sync = at76c651_readreg(state, 0x80);
312 *status = 0;
313
314 if (sync & (0x04 | 0x10)) /* AGC1 || TIM */
315 *status |= FE_HAS_SIGNAL;
316
317 if (sync & 0x10) /* TIM */
318 *status |= FE_HAS_CARRIER;
319
320 if (sync & 0x80) /* FEC */
321 *status |= FE_HAS_VITERBI;
322
323 if (sync & 0x40) /* CAR */
324 *status |= FE_HAS_SYNC;
325
326 if ((sync & 0xF0) == 0xF0) /* TIM && EQU && CAR && FEC */
327 *status |= FE_HAS_LOCK;
328
329 return 0;
330 }
331
332 static int at76c651_read_ber(struct dvb_frontend* fe, u32* ber)
333 {
334 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
335
336 *ber = (at76c651_readreg(state, 0x81) & 0x0F) << 16;
337 *ber |= at76c651_readreg(state, 0x82) << 8;
338 *ber |= at76c651_readreg(state, 0x83);
339 *ber *= 10;
340
341 return 0;
342 }
343
344 static int at76c651_read_signal_strength(struct dvb_frontend* fe, u16* strength)
345 {
346 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
347
348 u8 gain = ~at76c651_readreg(state, 0x91);
349 *strength = (gain << 8) | gain;
350
351 return 0;
352 }
353
354 static int at76c651_read_snr(struct dvb_frontend* fe, u16* snr)
355 {
356 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
357
358 *snr = 0xFFFF -
359 ((at76c651_readreg(state, 0x8F) << 8) |
360 at76c651_readreg(state, 0x90));
361
362
363 return 0;
364 }
365
366 static int at76c651_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
367 {
368 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
369
370 *ucblocks = at76c651_readreg(state, 0x82);
371
372 return 0;
373 }
374
375 static int at76c651_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *fesettings)
376 {
377 fesettings->min_delay_ms = 50;
378 fesettings->step_size = 0;
379 fesettings->max_drift = 0;
380 return 0;
381 }
382
383 static void at76c651_release(struct dvb_frontend* fe)
384 {
385 struct at76c651_state* state = (struct at76c651_state*) fe->demodulator_priv;
386 kfree(state);
387 }
388
389 static struct dvb_frontend_ops at76c651_ops;
390
391 struct dvb_frontend* at76c651_attach(const struct at76c651_config* config,
392 struct i2c_adapter* i2c)
393 {
394 struct at76c651_state* state = NULL;
395
396 /* allocate memory for the internal state */
397 state = (struct at76c651_state*) kmalloc(sizeof(struct at76c651_state), GFP_KERNEL);
398 if (state == NULL) goto error;
399
400 /* setup the state */
401 state->config = config;
402 state->qam = 0;
403
404 /* check if the demod is there */
405 if (at76c651_readreg(state, 0x0e) != 0x65) goto error;
406
407 /* finalise state setup */
408 state->i2c = i2c;
409 state->revision = at76c651_readreg(state, 0x0f) & 0xfe;
410 memcpy(&state->ops, &at76c651_ops, sizeof(struct dvb_frontend_ops));
411
412 /* create dvb_frontend */
413 state->frontend.ops = &state->ops;
414 state->frontend.demodulator_priv = state;
415 return &state->frontend;
416
417 error:
418 if (state) kfree(state);
419 return NULL;
420 }
421
422 static struct dvb_frontend_ops at76c651_ops = {
423
424 .info = {
425 .name = "Atmel AT76C651B DVB-C",
426 .type = FE_QAM,
427 .frequency_min = 48250000,
428 .frequency_max = 863250000,
429 .frequency_stepsize = 62500,
430 /*.frequency_tolerance = */ /* FIXME: 12% of SR */
431 .symbol_rate_min = 0, /* FIXME */
432 .symbol_rate_max = 9360000, /* FIXME */
433 .symbol_rate_tolerance = 4000,
434 .caps = FE_CAN_INVERSION_AUTO |
435 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
436 FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
437 FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
438 FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | FE_CAN_QAM_128 |
439 FE_CAN_MUTE_TS | FE_CAN_QAM_256 | FE_CAN_RECOVER
440 },
441
442 .release = at76c651_release,
443
444 .init = at76c651_set_defaults,
445
446 .set_frontend = at76c651_set_parameters,
447 .get_tune_settings = at76c651_get_tune_settings,
448
449 .read_status = at76c651_read_status,
450 .read_ber = at76c651_read_ber,
451 .read_signal_strength = at76c651_read_signal_strength,
452 .read_snr = at76c651_read_snr,
453 .read_ucblocks = at76c651_read_ucblocks,
454 };
455
456 module_param(debug, int, 0644);
457 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
458
459 MODULE_DESCRIPTION("Atmel AT76C651 DVB-C Demodulator Driver");
460 MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
461 MODULE_LICENSE("GPL");
462
463 EXPORT_SYMBOL(at76c651_attach);
464
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