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sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / dvb-frontends / cx24113.c
blob3883c3b31aef3d98109059242b73063d8a40d468
1 /*
2 * Driver for Conexant CX24113/CX24128 Tuner (Satellite)
3 *
4 * Copyright (C) 2007-8 Patrick Boettcher <pb@linuxtv.org>
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
50 u8 rev;
51 u8 ver;
52
53 u8 icp_mode:1;
54
55 #define ICP_LEVEL1 0
56 #define ICP_LEVEL2 1
57 #define ICP_LEVEL3 2
58 #define ICP_LEVEL4 3
59 u8 icp_man:2;
60 u8 icp_auto_low:2;
61 u8 icp_auto_mlow:2;
62 u8 icp_auto_mhi:2;
63 u8 icp_auto_hi:2;
64 u8 icp_dig;
65
66 #define LNA_MIN_GAIN 0
67 #define LNA_MID_GAIN 1
68 #define LNA_MAX_GAIN 2
69 u8 lna_gain:2;
70
71 u8 acp_on:1;
72
73 u8 vco_mode:2;
74 u8 vco_shift:1;
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
81 u8 vco_band;
82
83 #define VCODIV4 4
84 #define VCODIV2 2
85 u8 vcodiv;
86
87 u8 bs_delay:4;
88 u16 bs_freqcnt:13;
89 u16 bs_rdiv;
90 u8 prescaler_mode:1;
91
92 u8 rfvga_bias_ctrl;
93
94 s16 tuner_gain_thres;
95 u8 gain_level;
96
97 u32 frequency;
98
99 u8 refdiv;
100
101 u8 Fwindow_enabled;
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 {
481 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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
503 void cx24113_agc_callback(struct dvb_frontend *fe)
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 }
521 EXPORT_SYMBOL(cx24113_agc_callback);
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
556 struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
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 }
610 EXPORT_SYMBOL(cx24113_attach);
611
612 module_param(debug, int, 0644);
613 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
614
615 MODULE_AUTHOR("Patrick Boettcher <pb@linuxtv.org>");
616 MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24113/CX24128hardware");
617 MODULE_LICENSE("GPL");
618
Linux with added FPC-III support