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cx24113.c
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1 /*
2  * Driver for Conexant CX24113/CX24128 Tuner (Satellite)
3  *
4  * Copyright (C) 2007-8 Patrick Boettcher <[email protected]>
5  *
6  * Developed for BBTI / Technisat
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  *
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23 
24 #include <linux/slab.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 
29 #include "dvb_frontend.h"
30 #include "cx24113.h"
31 
32 static int debug;
33 
34 #define cx_info(args...) do { printk(KERN_INFO "CX24113: " args); } while (0)
35 #define cx_err(args...) do { printk(KERN_ERR "CX24113: " args); } while (0)
36 
37 #define dprintk(args...) \
38  do { \
39  if (debug) { \
40  printk(KERN_DEBUG "CX24113: %s: ", __func__); \
41  printk(args); \
42  } \
43  } while (0)
44 
45 struct cx24113_state {
46  struct i2c_adapter *i2c;
47  const struct cx24113_config *config;
48 
49 #define REV_CX24113 0x23
52 
54 
55 #define ICP_LEVEL1 0
56 #define ICP_LEVEL2 1
57 #define ICP_LEVEL3 2
58 #define ICP_LEVEL4 3
65 
66 #define LNA_MIN_GAIN 0
67 #define LNA_MID_GAIN 1
68 #define LNA_MAX_GAIN 2
70 
72 
75 #define VCOBANDSEL_6 0x80
76 #define VCOBANDSEL_5 0x01
77 #define VCOBANDSEL_4 0x02
78 #define VCOBANDSEL_3 0x04
79 #define VCOBANDSEL_2 0x08
80 #define VCOBANDSEL_1 0x10
82 
83 #define VCODIV4 4
84 #define VCODIV2 2
86 
91 
93 
96 
98 
100 
102 };
103 
104 static int cx24113_writereg(struct cx24113_state *state, int reg, int data)
105 {
106  u8 buf[] = { reg, data };
107  struct i2c_msg msg = { .addr = state->config->i2c_addr,
108  .flags = 0, .buf = buf, .len = 2 };
109  int err = i2c_transfer(state->i2c, &msg, 1);
110  if (err != 1) {
111  printk(KERN_DEBUG "%s: writereg error(err == %i, reg == 0x%02x,"
112  " data == 0x%02x)\n", __func__, err, reg, data);
113  return err;
114  }
115 
116  return 0;
117 }
118 
119 static int cx24113_readreg(struct cx24113_state *state, u8 reg)
120 {
121  int ret;
122  u8 b;
123  struct i2c_msg msg[] = {
124  { .addr = state->config->i2c_addr,
125  .flags = 0, .buf = &reg, .len = 1 },
126  { .addr = state->config->i2c_addr,
127  .flags = I2C_M_RD, .buf = &b, .len = 1 }
128  };
129 
130  ret = i2c_transfer(state->i2c, msg, 2);
131 
132  if (ret != 2) {
133  printk(KERN_DEBUG "%s: reg=0x%x (error=%d)\n",
134  __func__, reg, ret);
135  return ret;
136  }
137 
138  return b;
139 }
140 
141 static void cx24113_set_parameters(struct cx24113_state *state)
142 {
143  u8 r;
144 
145  r = cx24113_readreg(state, 0x10) & 0x82;
146  r |= state->icp_mode;
147  r |= state->icp_man << 4;
148  r |= state->icp_dig << 2;
149  r |= state->prescaler_mode << 5;
150  cx24113_writereg(state, 0x10, r);
151 
152  r = (state->icp_auto_low << 0) | (state->icp_auto_mlow << 2)
153  | (state->icp_auto_mhi << 4) | (state->icp_auto_hi << 6);
154  cx24113_writereg(state, 0x11, r);
155 
156  if (state->rev == REV_CX24113) {
157  r = cx24113_readreg(state, 0x20) & 0xec;
158  r |= state->lna_gain;
159  r |= state->rfvga_bias_ctrl << 4;
160  cx24113_writereg(state, 0x20, r);
161  }
162 
163  r = cx24113_readreg(state, 0x12) & 0x03;
164  r |= state->acp_on << 2;
165  r |= state->bs_delay << 4;
166  cx24113_writereg(state, 0x12, r);
167 
168  r = cx24113_readreg(state, 0x18) & 0x40;
169  r |= state->vco_shift;
170  if (state->vco_band == VCOBANDSEL_6)
171  r |= (1 << 7);
172  else
173  r |= (state->vco_band << 1);
174  cx24113_writereg(state, 0x18, r);
175 
176  r = cx24113_readreg(state, 0x14) & 0x20;
177  r |= (state->vco_mode << 6) | ((state->bs_freqcnt >> 8) & 0x1f);
178  cx24113_writereg(state, 0x14, r);
179  cx24113_writereg(state, 0x15, (state->bs_freqcnt & 0xff));
180 
181  cx24113_writereg(state, 0x16, (state->bs_rdiv >> 4) & 0xff);
182  r = (cx24113_readreg(state, 0x17) & 0x0f) |
183  ((state->bs_rdiv & 0x0f) << 4);
184  cx24113_writereg(state, 0x17, r);
185 }
186 
187 #define VGA_0 0x00
188 #define VGA_1 0x04
189 #define VGA_2 0x02
190 #define VGA_3 0x06
191 #define VGA_4 0x01
192 #define VGA_5 0x05
193 #define VGA_6 0x03
194 #define VGA_7 0x07
195 
196 #define RFVGA_0 0x00
197 #define RFVGA_1 0x01
198 #define RFVGA_2 0x02
199 #define RFVGA_3 0x03
200 
201 static int cx24113_set_gain_settings(struct cx24113_state *state,
202  s16 power_estimation)
203 {
204  u8 ampout = cx24113_readreg(state, 0x1d) & 0xf0,
205  vga = cx24113_readreg(state, 0x1f) & 0x3f,
206  rfvga = cx24113_readreg(state, 0x20) & 0xf3;
207  u8 gain_level = power_estimation >= state->tuner_gain_thres;
208 
209  dprintk("power estimation: %d, thres: %d, gain_level: %d/%d\n",
210  power_estimation, state->tuner_gain_thres,
211  state->gain_level, gain_level);
212 
213  if (gain_level == state->gain_level)
214  return 0; /* nothing to be done */
215 
216  ampout |= 0xf;
217 
218  if (gain_level) {
219  rfvga |= RFVGA_0 << 2;
220  vga |= (VGA_7 << 3) | VGA_7;
221  } else {
222  rfvga |= RFVGA_2 << 2;
223  vga |= (VGA_6 << 3) | VGA_2;
224  }
225  state->gain_level = gain_level;
226 
227  cx24113_writereg(state, 0x1d, ampout);
228  cx24113_writereg(state, 0x1f, vga);
229  cx24113_writereg(state, 0x20, rfvga);
230 
231  return 1; /* did something */
232 }
233 
234 static int cx24113_set_Fref(struct cx24113_state *state, u8 high)
235 {
236  u8 xtal = cx24113_readreg(state, 0x02);
237  if (state->rev == 0x43 && state->vcodiv == VCODIV4)
238  high = 1;
239 
240  xtal &= ~0x2;
241  if (high)
242  xtal |= high << 1;
243  return cx24113_writereg(state, 0x02, xtal);
244 }
245 
246 static int cx24113_enable(struct cx24113_state *state, u8 enable)
247 {
248  u8 r21 = (cx24113_readreg(state, 0x21) & 0xc0) | enable;
249  if (state->rev == REV_CX24113)
250  r21 |= (1 << 1);
251  return cx24113_writereg(state, 0x21, r21);
252 }
253 
254 static int cx24113_set_bandwidth(struct cx24113_state *state, u32 bandwidth_khz)
255 {
256  u8 r;
257 
258  if (bandwidth_khz <= 19000)
259  r = 0x03 << 6;
260  else if (bandwidth_khz <= 25000)
261  r = 0x02 << 6;
262  else
263  r = 0x01 << 6;
264 
265  dprintk("bandwidth to be set: %d\n", bandwidth_khz);
266  bandwidth_khz *= 10;
267  bandwidth_khz -= 10000;
268  bandwidth_khz /= 1000;
269  bandwidth_khz += 5;
270  bandwidth_khz /= 10;
271 
272  dprintk("bandwidth: %d %d\n", r >> 6, bandwidth_khz);
273 
274  r |= bandwidth_khz & 0x3f;
275 
276  return cx24113_writereg(state, 0x1e, r);
277 }
278 
279 static int cx24113_set_clk_inversion(struct cx24113_state *state, u8 on)
280 {
281  u8 r = (cx24113_readreg(state, 0x10) & 0x7f) | ((on & 0x1) << 7);
282  return cx24113_writereg(state, 0x10, r);
283 }
284 
285 static int cx24113_get_status(struct dvb_frontend *fe, u32 *status)
286 {
287  struct cx24113_state *state = fe->tuner_priv;
288  u8 r = (cx24113_readreg(state, 0x10) & 0x02) >> 1;
289  if (r)
290  *status |= TUNER_STATUS_LOCKED;
291  dprintk("PLL locked: %d\n", r);
292  return 0;
293 }
294 
295 static u8 cx24113_set_ref_div(struct cx24113_state *state, u8 refdiv)
296 {
297  if (state->rev == 0x43 && state->vcodiv == VCODIV4)
298  refdiv = 2;
299  return state->refdiv = refdiv;
300 }
301 
302 static void cx24113_calc_pll_nf(struct cx24113_state *state, u16 *n, s32 *f)
303 {
304  s32 N;
305  s64 F;
306  u64 dividend;
307  u8 R, r;
308  u8 vcodiv;
309  u8 factor;
310  s32 freq_hz = state->frequency * 1000;
311 
312  if (state->config->xtal_khz < 20000)
313  factor = 1;
314  else
315  factor = 2;
316 
317  if (state->rev == REV_CX24113) {
318  if (state->frequency >= 1100000)
319  vcodiv = VCODIV2;
320  else
321  vcodiv = VCODIV4;
322  } else {
323  if (state->frequency >= 1165000)
324  vcodiv = VCODIV2;
325  else
326  vcodiv = VCODIV4;
327  }
328  state->vcodiv = vcodiv;
329 
330  dprintk("calculating N/F for %dHz with vcodiv %d\n", freq_hz, vcodiv);
331  R = 0;
332  do {
333  R = cx24113_set_ref_div(state, R + 1);
334 
335  /* calculate tuner PLL settings: */
336  N = (freq_hz / 100 * vcodiv) * R;
337  N /= (state->config->xtal_khz) * factor * 2;
338  N += 5; /* For round up. */
339  N /= 10;
340  N -= 32;
341  } while (N < 6 && R < 3);
342 
343  if (N < 6) {
344  cx_err("strange frequency: N < 6\n");
345  return;
346  }
347  F = freq_hz;
348  F *= (u64) (R * vcodiv * 262144);
349  dprintk("1 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
350  /* do_div needs an u64 as first argument */
351  dividend = F;
352  do_div(dividend, state->config->xtal_khz * 1000 * factor * 2);
353  F = dividend;
354  dprintk("2 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
355  F -= (N + 32) * 262144;
356 
357  dprintk("3 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
358 
359  if (state->Fwindow_enabled) {
360  if (F > (262144 / 2 - 1638))
361  F = 262144 / 2 - 1638;
362  if (F < (-262144 / 2 + 1638))
363  F = -262144 / 2 + 1638;
364  if ((F < 3277 && F > 0) || (F > -3277 && F < 0)) {
365  F = 0;
366  r = cx24113_readreg(state, 0x10);
367  cx24113_writereg(state, 0x10, r | (1 << 6));
368  }
369  }
370  dprintk("4 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
371 
372  *n = (u16) N;
373  *f = (s32) F;
374 }
375 
376 
377 static void cx24113_set_nfr(struct cx24113_state *state, u16 n, s32 f, u8 r)
378 {
379  u8 reg;
380  cx24113_writereg(state, 0x19, (n >> 1) & 0xff);
381 
382  reg = ((n & 0x1) << 7) | ((f >> 11) & 0x7f);
383  cx24113_writereg(state, 0x1a, reg);
384 
385  cx24113_writereg(state, 0x1b, (f >> 3) & 0xff);
386 
387  reg = cx24113_readreg(state, 0x1c) & 0x1f;
388  cx24113_writereg(state, 0x1c, reg | ((f & 0x7) << 5));
389 
390  cx24113_set_Fref(state, r - 1);
391 }
392 
393 static int cx24113_set_frequency(struct cx24113_state *state, u32 frequency)
394 {
395  u8 r = 1; /* or 2 */
396  u16 n = 6;
397  s32 f = 0;
398 
399  r = cx24113_readreg(state, 0x14);
400  cx24113_writereg(state, 0x14, r & 0x3f);
401 
402  r = cx24113_readreg(state, 0x10);
403  cx24113_writereg(state, 0x10, r & 0xbf);
404 
405  state->frequency = frequency;
406 
407  dprintk("tuning to frequency: %d\n", frequency);
408 
409  cx24113_calc_pll_nf(state, &n, &f);
410  cx24113_set_nfr(state, n, f, state->refdiv);
411 
412  r = cx24113_readreg(state, 0x18) & 0xbf;
413  if (state->vcodiv != VCODIV2)
414  r |= 1 << 6;
415  cx24113_writereg(state, 0x18, r);
416 
417  /* The need for this sleep is not clear. But helps in some cases */
418  msleep(5);
419 
420  r = cx24113_readreg(state, 0x1c) & 0xef;
421  cx24113_writereg(state, 0x1c, r | (1 << 4));
422  return 0;
423 }
424 
425 static int cx24113_init(struct dvb_frontend *fe)
426 {
427  struct cx24113_state *state = fe->tuner_priv;
428  int ret;
429 
430  state->tuner_gain_thres = -50;
431  state->gain_level = 255; /* to force a gain-setting initialization */
432  state->icp_mode = 0;
433 
434  if (state->config->xtal_khz < 11000) {
435  state->icp_auto_hi = ICP_LEVEL4;
436  state->icp_auto_mhi = ICP_LEVEL4;
437  state->icp_auto_mlow = ICP_LEVEL3;
438  state->icp_auto_low = ICP_LEVEL3;
439  } else {
440  state->icp_auto_hi = ICP_LEVEL4;
441  state->icp_auto_mhi = ICP_LEVEL4;
442  state->icp_auto_mlow = ICP_LEVEL3;
443  state->icp_auto_low = ICP_LEVEL2;
444  }
445 
446  state->icp_dig = ICP_LEVEL3;
447  state->icp_man = ICP_LEVEL1;
448  state->acp_on = 1;
449  state->vco_mode = 0;
450  state->vco_shift = 0;
451  state->vco_band = VCOBANDSEL_1;
452  state->bs_delay = 8;
453  state->bs_freqcnt = 0x0fff;
454  state->bs_rdiv = 0x0fff;
455  state->prescaler_mode = 0;
456  state->lna_gain = LNA_MAX_GAIN;
457  state->rfvga_bias_ctrl = 1;
458  state->Fwindow_enabled = 1;
459 
460  cx24113_set_Fref(state, 0);
461  cx24113_enable(state, 0x3d);
462  cx24113_set_parameters(state);
463 
464  cx24113_set_gain_settings(state, -30);
465 
466  cx24113_set_bandwidth(state, 18025);
467  cx24113_set_clk_inversion(state, 1);
468 
469  if (state->config->xtal_khz >= 40000)
470  ret = cx24113_writereg(state, 0x02,
471  (cx24113_readreg(state, 0x02) & 0xfb) | (1 << 2));
472  else
473  ret = cx24113_writereg(state, 0x02,
474  (cx24113_readreg(state, 0x02) & 0xfb) | (0 << 2));
475 
476  return ret;
477 }
478 
479 static int cx24113_set_params(struct dvb_frontend *fe)
480 {
482  struct cx24113_state *state = fe->tuner_priv;
483  /* for a ROLL-OFF factor of 0.35, 0.2: 600, 0.25: 625 */
484  u32 roll_off = 675;
485  u32 bw;
486 
487  bw = ((c->symbol_rate/100) * roll_off) / 1000;
488  bw += (10000000/100) + 5;
489  bw /= 10;
490  bw += 1000;
491  cx24113_set_bandwidth(state, bw);
492 
493  cx24113_set_frequency(state, c->frequency);
494  msleep(5);
495  return cx24113_get_status(fe, &bw);
496 }
497 
498 static s8 cx24113_agc_table[2][10] = {
499  {-54, -41, -35, -30, -25, -21, -16, -10, -6, -2},
500  {-39, -35, -30, -25, -19, -15, -11, -5, 1, 9},
501 };
502 
504 {
505  struct cx24113_state *state = fe->tuner_priv;
506  s16 s, i;
507  if (!fe->ops.read_signal_strength)
508  return;
509 
510  do {
511  /* this only works with the current CX24123 implementation */
512  fe->ops.read_signal_strength(fe, (u16 *) &s);
513  s >>= 8;
514  dprintk("signal strength: %d\n", s);
515  for (i = 0; i < sizeof(cx24113_agc_table[0]); i++)
516  if (cx24113_agc_table[state->gain_level][i] > s)
517  break;
518  s = -25 - i*5;
519  } while (cx24113_set_gain_settings(state, s));
520 }
522 
523 static int cx24113_get_frequency(struct dvb_frontend *fe, u32 *frequency)
524 {
525  struct cx24113_state *state = fe->tuner_priv;
526  *frequency = state->frequency;
527  return 0;
528 }
529 
530 static int cx24113_release(struct dvb_frontend *fe)
531 {
532  struct cx24113_state *state = fe->tuner_priv;
533  dprintk("\n");
534  fe->tuner_priv = NULL;
535  kfree(state);
536  return 0;
537 }
538 
539 static const struct dvb_tuner_ops cx24113_tuner_ops = {
540  .info = {
541  .name = "Conexant CX24113",
542  .frequency_min = 950000,
543  .frequency_max = 2150000,
544  .frequency_step = 125,
545  },
546 
547  .release = cx24113_release,
548 
549  .init = cx24113_init,
550 
551  .set_params = cx24113_set_params,
552  .get_frequency = cx24113_get_frequency,
553  .get_status = cx24113_get_status,
554 };
555 
557  const struct cx24113_config *config, struct i2c_adapter *i2c)
558 {
559  /* allocate memory for the internal state */
560  struct cx24113_state *state =
561  kzalloc(sizeof(struct cx24113_state), GFP_KERNEL);
562  int rc;
563  if (state == NULL) {
564  cx_err("Unable to kzalloc\n");
565  goto error;
566  }
567 
568  /* setup the state */
569  state->config = config;
570  state->i2c = i2c;
571 
572  cx_info("trying to detect myself\n");
573 
574  /* making a dummy read, because of some expected troubles
575  * after power on */
576  cx24113_readreg(state, 0x00);
577 
578  rc = cx24113_readreg(state, 0x00);
579  if (rc < 0) {
580  cx_info("CX24113 not found.\n");
581  goto error;
582  }
583  state->rev = rc;
584 
585  switch (rc) {
586  case 0x43:
587  cx_info("detected CX24113 variant\n");
588  break;
589  case REV_CX24113:
590  cx_info("successfully detected\n");
591  break;
592  default:
593  cx_err("unsupported device id: %x\n", state->rev);
594  goto error;
595  }
596  state->ver = cx24113_readreg(state, 0x01);
597  cx_info("version: %x\n", state->ver);
598 
599  /* create dvb_frontend */
600  memcpy(&fe->ops.tuner_ops, &cx24113_tuner_ops,
601  sizeof(struct dvb_tuner_ops));
602  fe->tuner_priv = state;
603  return fe;
604 
605 error:
606  kfree(state);
607 
608  return NULL;
609 }
611 
612 module_param(debug, int, 0644);
613 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
614 
615 MODULE_AUTHOR("Patrick Boettcher <[email protected]>");
616 MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24113/CX24128hardware");
617 MODULE_LICENSE("GPL");
618