1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for DiBcom DiB3000MC/P-demodulator.
4  *
5  * Copyright (C) 2004-7 DiBcom (http://www.dibcom.fr/)
6  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de)
7  *
8  * This code is partially based on the previous dib3000mc.c .
9  */
10 
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/i2c.h>
16 
17 #include <media/dvb_frontend.h>
18 
19 #include "dib3000mc.h"
20 
21 static int debug;
22 module_param(debug, int, 0644);
23 MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");
24 
25 static int buggy_sfn_workaround;
26 module_param(buggy_sfn_workaround, int, 0644);
27 MODULE_PARM_DESC(buggy_sfn_workaround, "Enable work-around for buggy SFNs (default: 0)");
28 
29 #define dprintk(fmt, arg...) do {					\
30 	if (debug)							\
31 		printk(KERN_DEBUG pr_fmt("%s: " fmt),			\
32 		       __func__, ##arg);				\
33 } while (0)
34 
35 struct dib3000mc_state {
36 	struct dvb_frontend demod;
37 	struct dib3000mc_config *cfg;
38 
39 	u8 i2c_addr;
40 	struct i2c_adapter *i2c_adap;
41 
42 	struct dibx000_i2c_master i2c_master;
43 
44 	u32 timf;
45 
46 	u32 current_bandwidth;
47 
48 	u16 dev_id;
49 
50 	u8 sfn_workaround_active :1;
51 };
52 
53 static u16 dib3000mc_read_word(struct dib3000mc_state *state, u16 reg)
54 {
55 	struct i2c_msg msg[2] = {
56 		{ .addr = state->i2c_addr >> 1, .flags = 0,        .len = 2 },
57 		{ .addr = state->i2c_addr >> 1, .flags = I2C_M_RD, .len = 2 },
58 	};
59 	u16 word;
60 	u8 *b;
61 
62 	b = kmalloc(4, GFP_KERNEL);
63 	if (!b)
64 		return 0;
65 
66 	b[0] = (reg >> 8) | 0x80;
67 	b[1] = reg;
68 	b[2] = 0;
69 	b[3] = 0;
70 
71 	msg[0].buf = b;
72 	msg[1].buf = b + 2;
73 
74 	if (i2c_transfer(state->i2c_adap, msg, 2) != 2)
75 		dprintk("i2c read error on %d\n",reg);
76 
77 	word = (b[2] << 8) | b[3];
78 	kfree(b);
79 
80 	return word;
81 }
82 
83 static int dib3000mc_write_word(struct dib3000mc_state *state, u16 reg, u16 val)
84 {
85 	struct i2c_msg msg = {
86 		.addr = state->i2c_addr >> 1, .flags = 0, .len = 4
87 	};
88 	int rc;
89 	u8 *b;
90 
91 	b = kmalloc(4, GFP_KERNEL);
92 	if (!b)
93 		return -ENOMEM;
94 
95 	b[0] = reg >> 8;
96 	b[1] = reg;
97 	b[2] = val >> 8;
98 	b[3] = val;
99 
100 	msg.buf = b;
101 
102 	rc = i2c_transfer(state->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
103 	kfree(b);
104 
105 	return rc;
106 }
107 
108 static int dib3000mc_identify(struct dib3000mc_state *state)
109 {
110 	u16 value;
111 	if ((value = dib3000mc_read_word(state, 1025)) != 0x01b3) {
112 		dprintk("-E-  DiB3000MC/P: wrong Vendor ID (read=0x%x)\n",value);
113 		return -EREMOTEIO;
114 	}
115 
116 	value = dib3000mc_read_word(state, 1026);
117 	if (value != 0x3001 && value != 0x3002) {
118 		dprintk("-E-  DiB3000MC/P: wrong Device ID (%x)\n",value);
119 		return -EREMOTEIO;
120 	}
121 	state->dev_id = value;
122 
123 	dprintk("-I-  found DiB3000MC/P: %x\n",state->dev_id);
124 
125 	return 0;
126 }
127 
128 static int dib3000mc_set_timing(struct dib3000mc_state *state, s16 nfft, u32 bw, u8 update_offset)
129 {
130 	u32 timf;
131 
132 	if (state->timf == 0) {
133 		timf = 1384402; // default value for 8MHz
134 		if (update_offset)
135 			msleep(200); // first time we do an update
136 	} else
137 		timf = state->timf;
138 
139 	timf *= (bw / 1000);
140 
141 	if (update_offset) {
142 		s16 tim_offs = dib3000mc_read_word(state, 416);
143 
144 		if (tim_offs &  0x2000)
145 			tim_offs -= 0x4000;
146 
147 		if (nfft == TRANSMISSION_MODE_2K)
148 			tim_offs *= 4;
149 
150 		timf += tim_offs;
151 		state->timf = timf / (bw / 1000);
152 	}
153 
154 	dprintk("timf: %d\n", timf);
155 
156 	dib3000mc_write_word(state, 23, (u16) (timf >> 16));
157 	dib3000mc_write_word(state, 24, (u16) (timf      ) & 0xffff);
158 
159 	return 0;
160 }
161 
162 static int dib3000mc_setup_pwm_state(struct dib3000mc_state *state)
163 {
164 	u16 reg_51, reg_52 = state->cfg->agc->setup & 0xfefb;
165 	if (state->cfg->pwm3_inversion) {
166 		reg_51 =  (2 << 14) | (0 << 10) | (7 << 6) | (2 << 2) | (2 << 0);
167 		reg_52 |= (1 << 2);
168 	} else {
169 		reg_51 = (2 << 14) | (4 << 10) | (7 << 6) | (2 << 2) | (2 << 0);
170 		reg_52 |= (1 << 8);
171 	}
172 	dib3000mc_write_word(state, 51, reg_51);
173 	dib3000mc_write_word(state, 52, reg_52);
174 
175 	if (state->cfg->use_pwm3)
176 		dib3000mc_write_word(state, 245, (1 << 3) | (1 << 0));
177 	else
178 		dib3000mc_write_word(state, 245, 0);
179 
180 	dib3000mc_write_word(state, 1040, 0x3);
181 	return 0;
182 }
183 
184 static int dib3000mc_set_output_mode(struct dib3000mc_state *state, int mode)
185 {
186 	int    ret = 0;
187 	u16 fifo_threshold = 1792;
188 	u16 outreg = 0;
189 	u16 outmode = 0;
190 	u16 elecout = 1;
191 	u16 smo_reg = dib3000mc_read_word(state, 206) & 0x0010; /* keep the pid_parse bit */
192 
193 	dprintk("-I-  Setting output mode for demod %p to %d\n",
194 			&state->demod, mode);
195 
196 	switch (mode) {
197 		case OUTMODE_HIGH_Z:  // disable
198 			elecout = 0;
199 			break;
200 		case OUTMODE_MPEG2_PAR_GATED_CLK:   // STBs with parallel gated clock
201 			outmode = 0;
202 			break;
203 		case OUTMODE_MPEG2_PAR_CONT_CLK:    // STBs with parallel continues clock
204 			outmode = 1;
205 			break;
206 		case OUTMODE_MPEG2_SERIAL:          // STBs with serial input
207 			outmode = 2;
208 			break;
209 		case OUTMODE_MPEG2_FIFO:            // e.g. USB feeding
210 			elecout = 3;
211 			/*ADDR @ 206 :
212 			P_smo_error_discard  [1;6:6] = 0
213 			P_smo_rs_discard     [1;5:5] = 0
214 			P_smo_pid_parse      [1;4:4] = 0
215 			P_smo_fifo_flush     [1;3:3] = 0
216 			P_smo_mode           [2;2:1] = 11
217 			P_smo_ovf_prot       [1;0:0] = 0
218 			*/
219 			smo_reg |= 3 << 1;
220 			fifo_threshold = 512;
221 			outmode = 5;
222 			break;
223 		case OUTMODE_DIVERSITY:
224 			outmode = 4;
225 			elecout = 1;
226 			break;
227 		default:
228 			dprintk("Unhandled output_mode passed to be set for demod %p\n",&state->demod);
229 			outmode = 0;
230 			break;
231 	}
232 
233 	if ((state->cfg->output_mpeg2_in_188_bytes))
234 		smo_reg |= (1 << 5); // P_smo_rs_discard     [1;5:5] = 1
235 
236 	outreg = dib3000mc_read_word(state, 244) & 0x07FF;
237 	outreg |= (outmode << 11);
238 	ret |= dib3000mc_write_word(state,  244, outreg);
239 	ret |= dib3000mc_write_word(state,  206, smo_reg);   /*smo_ mode*/
240 	ret |= dib3000mc_write_word(state,  207, fifo_threshold); /* synchronous fread */
241 	ret |= dib3000mc_write_word(state, 1040, elecout);         /* P_out_cfg */
242 	return ret;
243 }
244 
245 static int dib3000mc_set_bandwidth(struct dib3000mc_state *state, u32 bw)
246 {
247 	u16 bw_cfg[6] = { 0 };
248 	u16 imp_bw_cfg[3] = { 0 };
249 	u16 reg;
250 
251 /* settings here are for 27.7MHz */
252 	switch (bw) {
253 		case 8000:
254 			bw_cfg[0] = 0x0019; bw_cfg[1] = 0x5c30; bw_cfg[2] = 0x0054; bw_cfg[3] = 0x88a0; bw_cfg[4] = 0x01a6; bw_cfg[5] = 0xab20;
255 			imp_bw_cfg[0] = 0x04db; imp_bw_cfg[1] = 0x00db; imp_bw_cfg[2] = 0x00b7;
256 			break;
257 
258 		case 7000:
259 			bw_cfg[0] = 0x001c; bw_cfg[1] = 0xfba5; bw_cfg[2] = 0x0060; bw_cfg[3] = 0x9c25; bw_cfg[4] = 0x01e3; bw_cfg[5] = 0x0cb7;
260 			imp_bw_cfg[0] = 0x04c0; imp_bw_cfg[1] = 0x00c0; imp_bw_cfg[2] = 0x00a0;
261 			break;
262 
263 		case 6000:
264 			bw_cfg[0] = 0x0021; bw_cfg[1] = 0xd040; bw_cfg[2] = 0x0070; bw_cfg[3] = 0xb62b; bw_cfg[4] = 0x0233; bw_cfg[5] = 0x8ed5;
265 			imp_bw_cfg[0] = 0x04a5; imp_bw_cfg[1] = 0x00a5; imp_bw_cfg[2] = 0x0089;
266 			break;
267 
268 		case 5000:
269 			bw_cfg[0] = 0x0028; bw_cfg[1] = 0x9380; bw_cfg[2] = 0x0087; bw_cfg[3] = 0x4100; bw_cfg[4] = 0x02a4; bw_cfg[5] = 0x4500;
270 			imp_bw_cfg[0] = 0x0489; imp_bw_cfg[1] = 0x0089; imp_bw_cfg[2] = 0x0072;
271 			break;
272 
273 		default: return -EINVAL;
274 	}
275 
276 	for (reg = 6; reg < 12; reg++)
277 		dib3000mc_write_word(state, reg, bw_cfg[reg - 6]);
278 	dib3000mc_write_word(state, 12, 0x0000);
279 	dib3000mc_write_word(state, 13, 0x03e8);
280 	dib3000mc_write_word(state, 14, 0x0000);
281 	dib3000mc_write_word(state, 15, 0x03f2);
282 	dib3000mc_write_word(state, 16, 0x0001);
283 	dib3000mc_write_word(state, 17, 0xb0d0);
284 	// P_sec_len
285 	dib3000mc_write_word(state, 18, 0x0393);
286 	dib3000mc_write_word(state, 19, 0x8700);
287 
288 	for (reg = 55; reg < 58; reg++)
289 		dib3000mc_write_word(state, reg, imp_bw_cfg[reg - 55]);
290 
291 	// Timing configuration
292 	dib3000mc_set_timing(state, TRANSMISSION_MODE_2K, bw, 0);
293 
294 	return 0;
295 }
296 
297 static u16 impulse_noise_val[29] =
298 
299 {
300 	0x38, 0x6d9, 0x3f28, 0x7a7, 0x3a74, 0x196, 0x32a, 0x48c, 0x3ffe, 0x7f3,
301 	0x2d94, 0x76, 0x53d, 0x3ff8, 0x7e3, 0x3320, 0x76, 0x5b3, 0x3feb, 0x7d2,
302 	0x365e, 0x76, 0x48c, 0x3ffe, 0x5b3, 0x3feb, 0x76, 0x0000, 0xd
303 };
304 
305 static void dib3000mc_set_impulse_noise(struct dib3000mc_state *state, u8 mode, s16 nfft)
306 {
307 	u16 i;
308 	for (i = 58; i < 87; i++)
309 		dib3000mc_write_word(state, i, impulse_noise_val[i-58]);
310 
311 	if (nfft == TRANSMISSION_MODE_8K) {
312 		dib3000mc_write_word(state, 58, 0x3b);
313 		dib3000mc_write_word(state, 84, 0x00);
314 		dib3000mc_write_word(state, 85, 0x8200);
315 	}
316 
317 	dib3000mc_write_word(state, 34, 0x1294);
318 	dib3000mc_write_word(state, 35, 0x1ff8);
319 	if (mode == 1)
320 		dib3000mc_write_word(state, 55, dib3000mc_read_word(state, 55) | (1 << 10));
321 }
322 
323 static int dib3000mc_init(struct dvb_frontend *demod)
324 {
325 	struct dib3000mc_state *state = demod->demodulator_priv;
326 	struct dibx000_agc_config *agc = state->cfg->agc;
327 
328 	// Restart Configuration
329 	dib3000mc_write_word(state, 1027, 0x8000);
330 	dib3000mc_write_word(state, 1027, 0x0000);
331 
332 	// power up the demod + mobility configuration
333 	dib3000mc_write_word(state, 140, 0x0000);
334 	dib3000mc_write_word(state, 1031, 0);
335 
336 	if (state->cfg->mobile_mode) {
337 		dib3000mc_write_word(state, 139,  0x0000);
338 		dib3000mc_write_word(state, 141,  0x0000);
339 		dib3000mc_write_word(state, 175,  0x0002);
340 		dib3000mc_write_word(state, 1032, 0x0000);
341 	} else {
342 		dib3000mc_write_word(state, 139,  0x0001);
343 		dib3000mc_write_word(state, 141,  0x0000);
344 		dib3000mc_write_word(state, 175,  0x0000);
345 		dib3000mc_write_word(state, 1032, 0x012C);
346 	}
347 	dib3000mc_write_word(state, 1033, 0x0000);
348 
349 	// P_clk_cfg
350 	dib3000mc_write_word(state, 1037, 0x3130);
351 
352 	// other configurations
353 
354 	// P_ctrl_sfreq
355 	dib3000mc_write_word(state, 33, (5 << 0));
356 	dib3000mc_write_word(state, 88, (1 << 10) | (0x10 << 0));
357 
358 	// Phase noise control
359 	// P_fft_phacor_inh, P_fft_phacor_cpe, P_fft_powrange
360 	dib3000mc_write_word(state, 99, (1 << 9) | (0x20 << 0));
361 
362 	if (state->cfg->phase_noise_mode == 0)
363 		dib3000mc_write_word(state, 111, 0x00);
364 	else
365 		dib3000mc_write_word(state, 111, 0x02);
366 
367 	// P_agc_global
368 	dib3000mc_write_word(state, 50, 0x8000);
369 
370 	// agc setup misc
371 	dib3000mc_setup_pwm_state(state);
372 
373 	// P_agc_counter_lock
374 	dib3000mc_write_word(state, 53, 0x87);
375 	// P_agc_counter_unlock
376 	dib3000mc_write_word(state, 54, 0x87);
377 
378 	/* agc */
379 	dib3000mc_write_word(state, 36, state->cfg->max_time);
380 	dib3000mc_write_word(state, 37, (state->cfg->agc_command1 << 13) | (state->cfg->agc_command2 << 12) | (0x1d << 0));
381 	dib3000mc_write_word(state, 38, state->cfg->pwm3_value);
382 	dib3000mc_write_word(state, 39, state->cfg->ln_adc_level);
383 
384 	// set_agc_loop_Bw
385 	dib3000mc_write_word(state, 40, 0x0179);
386 	dib3000mc_write_word(state, 41, 0x03f0);
387 
388 	dib3000mc_write_word(state, 42, agc->agc1_max);
389 	dib3000mc_write_word(state, 43, agc->agc1_min);
390 	dib3000mc_write_word(state, 44, agc->agc2_max);
391 	dib3000mc_write_word(state, 45, agc->agc2_min);
392 	dib3000mc_write_word(state, 46, (agc->agc1_pt1 << 8) | agc->agc1_pt2);
393 	dib3000mc_write_word(state, 47, (agc->agc1_slope1 << 8) | agc->agc1_slope2);
394 	dib3000mc_write_word(state, 48, (agc->agc2_pt1 << 8) | agc->agc2_pt2);
395 	dib3000mc_write_word(state, 49, (agc->agc2_slope1 << 8) | agc->agc2_slope2);
396 
397 // Begin: TimeOut registers
398 	// P_pha3_thres
399 	dib3000mc_write_word(state, 110, 3277);
400 	// P_timf_alpha = 6, P_corm_alpha = 6, P_corm_thres = 0x80
401 	dib3000mc_write_word(state,  26, 0x6680);
402 	// lock_mask0
403 	dib3000mc_write_word(state, 1, 4);
404 	// lock_mask1
405 	dib3000mc_write_word(state, 2, 4);
406 	// lock_mask2
407 	dib3000mc_write_word(state, 3, 0x1000);
408 	// P_search_maxtrial=1
409 	dib3000mc_write_word(state, 5, 1);
410 
411 	dib3000mc_set_bandwidth(state, 8000);
412 
413 	// div_lock_mask
414 	dib3000mc_write_word(state,  4, 0x814);
415 
416 	dib3000mc_write_word(state, 21, (1 << 9) | 0x164);
417 	dib3000mc_write_word(state, 22, 0x463d);
418 
419 	// Spurious rm cfg
420 	// P_cspu_regul, P_cspu_win_cut
421 	dib3000mc_write_word(state, 120, 0x200f);
422 	// P_adp_selec_monit
423 	dib3000mc_write_word(state, 134, 0);
424 
425 	// Fec cfg
426 	dib3000mc_write_word(state, 195, 0x10);
427 
428 	// diversity register: P_dvsy_sync_wait..
429 	dib3000mc_write_word(state, 180, 0x2FF0);
430 
431 	// Impulse noise configuration
432 	dib3000mc_set_impulse_noise(state, 0, TRANSMISSION_MODE_8K);
433 
434 	// output mode set-up
435 	dib3000mc_set_output_mode(state, OUTMODE_HIGH_Z);
436 
437 	/* close the i2c-gate */
438 	dib3000mc_write_word(state, 769, (1 << 7) );
439 
440 	return 0;
441 }
442 
443 static int dib3000mc_sleep(struct dvb_frontend *demod)
444 {
445 	struct dib3000mc_state *state = demod->demodulator_priv;
446 
447 	dib3000mc_write_word(state, 1031, 0xFFFF);
448 	dib3000mc_write_word(state, 1032, 0xFFFF);
449 	dib3000mc_write_word(state, 1033, 0xFFF0);
450 
451 	return 0;
452 }
453 
454 static void dib3000mc_set_adp_cfg(struct dib3000mc_state *state, s16 qam)
455 {
456 	u16 cfg[4] = { 0 },reg;
457 	switch (qam) {
458 		case QPSK:
459 			cfg[0] = 0x099a; cfg[1] = 0x7fae; cfg[2] = 0x0333; cfg[3] = 0x7ff0;
460 			break;
461 		case QAM_16:
462 			cfg[0] = 0x023d; cfg[1] = 0x7fdf; cfg[2] = 0x00a4; cfg[3] = 0x7ff0;
463 			break;
464 		case QAM_64:
465 			cfg[0] = 0x0148; cfg[1] = 0x7ff0; cfg[2] = 0x00a4; cfg[3] = 0x7ff8;
466 			break;
467 	}
468 	for (reg = 129; reg < 133; reg++)
469 		dib3000mc_write_word(state, reg, cfg[reg - 129]);
470 }
471 
472 static void dib3000mc_set_channel_cfg(struct dib3000mc_state *state,
473 				      struct dtv_frontend_properties *ch, u16 seq)
474 {
475 	u16 value;
476 	u32 bw = BANDWIDTH_TO_KHZ(ch->bandwidth_hz);
477 
478 	dib3000mc_set_bandwidth(state, bw);
479 	dib3000mc_set_timing(state, ch->transmission_mode, bw, 0);
480 
481 #if 1
482 	dib3000mc_write_word(state, 100, (16 << 6) + 9);
483 #else
484 	if (boost)
485 		dib3000mc_write_word(state, 100, (11 << 6) + 6);
486 	else
487 		dib3000mc_write_word(state, 100, (16 << 6) + 9);
488 #endif
489 
490 	dib3000mc_write_word(state, 1027, 0x0800);
491 	dib3000mc_write_word(state, 1027, 0x0000);
492 
493 	//Default cfg isi offset adp
494 	dib3000mc_write_word(state, 26,  0x6680);
495 	dib3000mc_write_word(state, 29,  0x1273);
496 	dib3000mc_write_word(state, 33,       5);
497 	dib3000mc_set_adp_cfg(state, QAM_16);
498 	dib3000mc_write_word(state, 133,  15564);
499 
500 	dib3000mc_write_word(state, 12 , 0x0);
501 	dib3000mc_write_word(state, 13 , 0x3e8);
502 	dib3000mc_write_word(state, 14 , 0x0);
503 	dib3000mc_write_word(state, 15 , 0x3f2);
504 
505 	dib3000mc_write_word(state, 93,0);
506 	dib3000mc_write_word(state, 94,0);
507 	dib3000mc_write_word(state, 95,0);
508 	dib3000mc_write_word(state, 96,0);
509 	dib3000mc_write_word(state, 97,0);
510 	dib3000mc_write_word(state, 98,0);
511 
512 	dib3000mc_set_impulse_noise(state, 0, ch->transmission_mode);
513 
514 	value = 0;
515 	switch (ch->transmission_mode) {
516 		case TRANSMISSION_MODE_2K: value |= (0 << 7); break;
517 		default:
518 		case TRANSMISSION_MODE_8K: value |= (1 << 7); break;
519 	}
520 	switch (ch->guard_interval) {
521 		case GUARD_INTERVAL_1_32: value |= (0 << 5); break;
522 		case GUARD_INTERVAL_1_16: value |= (1 << 5); break;
523 		case GUARD_INTERVAL_1_4:  value |= (3 << 5); break;
524 		default:
525 		case GUARD_INTERVAL_1_8:  value |= (2 << 5); break;
526 	}
527 	switch (ch->modulation) {
528 		case QPSK:  value |= (0 << 3); break;
529 		case QAM_16: value |= (1 << 3); break;
530 		default:
531 		case QAM_64: value |= (2 << 3); break;
532 	}
533 	switch (HIERARCHY_1) {
534 		case HIERARCHY_2: value |= 2; break;
535 		case HIERARCHY_4: value |= 4; break;
536 		default:
537 		case HIERARCHY_1: value |= 1; break;
538 	}
539 	dib3000mc_write_word(state, 0, value);
540 	dib3000mc_write_word(state, 5, (1 << 8) | ((seq & 0xf) << 4));
541 
542 	value = 0;
543 	if (ch->hierarchy == 1)
544 		value |= (1 << 4);
545 	if (1 == 1)
546 		value |= 1;
547 	switch ((ch->hierarchy == 0 || 1 == 1) ? ch->code_rate_HP : ch->code_rate_LP) {
548 		case FEC_2_3: value |= (2 << 1); break;
549 		case FEC_3_4: value |= (3 << 1); break;
550 		case FEC_5_6: value |= (5 << 1); break;
551 		case FEC_7_8: value |= (7 << 1); break;
552 		default:
553 		case FEC_1_2: value |= (1 << 1); break;
554 	}
555 	dib3000mc_write_word(state, 181, value);
556 
557 	// diversity synchro delay add 50% SFN margin
558 	switch (ch->transmission_mode) {
559 		case TRANSMISSION_MODE_8K: value = 256; break;
560 		case TRANSMISSION_MODE_2K:
561 		default: value = 64; break;
562 	}
563 	switch (ch->guard_interval) {
564 		case GUARD_INTERVAL_1_16: value *= 2; break;
565 		case GUARD_INTERVAL_1_8:  value *= 4; break;
566 		case GUARD_INTERVAL_1_4:  value *= 8; break;
567 		default:
568 		case GUARD_INTERVAL_1_32: value *= 1; break;
569 	}
570 	value <<= 4;
571 	value |= dib3000mc_read_word(state, 180) & 0x000f;
572 	dib3000mc_write_word(state, 180, value);
573 
574 	// restart demod
575 	value = dib3000mc_read_word(state, 0);
576 	dib3000mc_write_word(state, 0, value | (1 << 9));
577 	dib3000mc_write_word(state, 0, value);
578 
579 	msleep(30);
580 
581 	dib3000mc_set_impulse_noise(state, state->cfg->impulse_noise_mode, ch->transmission_mode);
582 }
583 
584 static int dib3000mc_autosearch_start(struct dvb_frontend *demod)
585 {
586 	struct dtv_frontend_properties *chan = &demod->dtv_property_cache;
587 	struct dib3000mc_state *state = demod->demodulator_priv;
588 	u16 reg;
589 //	u32 val;
590 	struct dtv_frontend_properties schan;
591 
592 	schan = *chan;
593 
594 	/* TODO what is that ? */
595 
596 	/* a channel for autosearch */
597 	schan.transmission_mode = TRANSMISSION_MODE_8K;
598 	schan.guard_interval = GUARD_INTERVAL_1_32;
599 	schan.modulation = QAM_64;
600 	schan.code_rate_HP = FEC_2_3;
601 	schan.code_rate_LP = FEC_2_3;
602 	schan.hierarchy = 0;
603 
604 	dib3000mc_set_channel_cfg(state, &schan, 11);
605 
606 	reg = dib3000mc_read_word(state, 0);
607 	dib3000mc_write_word(state, 0, reg | (1 << 8));
608 	dib3000mc_read_word(state, 511);
609 	dib3000mc_write_word(state, 0, reg);
610 
611 	return 0;
612 }
613 
614 static int dib3000mc_autosearch_is_irq(struct dvb_frontend *demod)
615 {
616 	struct dib3000mc_state *state = demod->demodulator_priv;
617 	u16 irq_pending = dib3000mc_read_word(state, 511);
618 
619 	if (irq_pending & 0x1) // failed
620 		return 1;
621 
622 	if (irq_pending & 0x2) // succeeded
623 		return 2;
624 
625 	return 0; // still pending
626 }
627 
628 static int dib3000mc_tune(struct dvb_frontend *demod)
629 {
630 	struct dtv_frontend_properties *ch = &demod->dtv_property_cache;
631 	struct dib3000mc_state *state = demod->demodulator_priv;
632 
633 	// ** configure demod **
634 	dib3000mc_set_channel_cfg(state, ch, 0);
635 
636 	// activates isi
637 	if (state->sfn_workaround_active) {
638 		dprintk("SFN workaround is active\n");
639 		dib3000mc_write_word(state, 29, 0x1273);
640 		dib3000mc_write_word(state, 108, 0x4000); // P_pha3_force_pha_shift
641 	} else {
642 		dib3000mc_write_word(state, 29, 0x1073);
643 		dib3000mc_write_word(state, 108, 0x0000); // P_pha3_force_pha_shift
644 	}
645 
646 	dib3000mc_set_adp_cfg(state, (u8)ch->modulation);
647 	if (ch->transmission_mode == TRANSMISSION_MODE_8K) {
648 		dib3000mc_write_word(state, 26, 38528);
649 		dib3000mc_write_word(state, 33, 8);
650 	} else {
651 		dib3000mc_write_word(state, 26, 30336);
652 		dib3000mc_write_word(state, 33, 6);
653 	}
654 
655 	if (dib3000mc_read_word(state, 509) & 0x80)
656 		dib3000mc_set_timing(state, ch->transmission_mode,
657 				     BANDWIDTH_TO_KHZ(ch->bandwidth_hz), 1);
658 
659 	return 0;
660 }
661 
662 struct i2c_adapter * dib3000mc_get_tuner_i2c_master(struct dvb_frontend *demod, int gating)
663 {
664 	struct dib3000mc_state *st = demod->demodulator_priv;
665 	return dibx000_get_i2c_adapter(&st->i2c_master, DIBX000_I2C_INTERFACE_TUNER, gating);
666 }
667 
668 EXPORT_SYMBOL(dib3000mc_get_tuner_i2c_master);
669 
670 static int dib3000mc_get_frontend(struct dvb_frontend* fe,
671 				  struct dtv_frontend_properties *fep)
672 {
673 	struct dib3000mc_state *state = fe->demodulator_priv;
674 	u16 tps = dib3000mc_read_word(state,458);
675 
676 	fep->inversion = INVERSION_AUTO;
677 
678 	fep->bandwidth_hz = state->current_bandwidth;
679 
680 	switch ((tps >> 8) & 0x1) {
681 		case 0: fep->transmission_mode = TRANSMISSION_MODE_2K; break;
682 		case 1: fep->transmission_mode = TRANSMISSION_MODE_8K; break;
683 	}
684 
685 	switch (tps & 0x3) {
686 		case 0: fep->guard_interval = GUARD_INTERVAL_1_32; break;
687 		case 1: fep->guard_interval = GUARD_INTERVAL_1_16; break;
688 		case 2: fep->guard_interval = GUARD_INTERVAL_1_8; break;
689 		case 3: fep->guard_interval = GUARD_INTERVAL_1_4; break;
690 	}
691 
692 	switch ((tps >> 13) & 0x3) {
693 		case 0: fep->modulation = QPSK; break;
694 		case 1: fep->modulation = QAM_16; break;
695 		case 2:
696 		default: fep->modulation = QAM_64; break;
697 	}
698 
699 	/* as long as the frontend_param structure is fixed for hierarchical transmission I refuse to use it */
700 	/* (tps >> 12) & 0x1 == hrch is used, (tps >> 9) & 0x7 == alpha */
701 
702 	fep->hierarchy = HIERARCHY_NONE;
703 	switch ((tps >> 5) & 0x7) {
704 		case 1: fep->code_rate_HP = FEC_1_2; break;
705 		case 2: fep->code_rate_HP = FEC_2_3; break;
706 		case 3: fep->code_rate_HP = FEC_3_4; break;
707 		case 5: fep->code_rate_HP = FEC_5_6; break;
708 		case 7:
709 		default: fep->code_rate_HP = FEC_7_8; break;
710 
711 	}
712 
713 	switch ((tps >> 2) & 0x7) {
714 		case 1: fep->code_rate_LP = FEC_1_2; break;
715 		case 2: fep->code_rate_LP = FEC_2_3; break;
716 		case 3: fep->code_rate_LP = FEC_3_4; break;
717 		case 5: fep->code_rate_LP = FEC_5_6; break;
718 		case 7:
719 		default: fep->code_rate_LP = FEC_7_8; break;
720 	}
721 
722 	return 0;
723 }
724 
725 static int dib3000mc_set_frontend(struct dvb_frontend *fe)
726 {
727 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
728 	struct dib3000mc_state *state = fe->demodulator_priv;
729 	int ret;
730 
731 	dib3000mc_set_output_mode(state, OUTMODE_HIGH_Z);
732 
733 	state->current_bandwidth = fep->bandwidth_hz;
734 	dib3000mc_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->bandwidth_hz));
735 
736 	/* maybe the parameter has been changed */
737 	state->sfn_workaround_active = buggy_sfn_workaround;
738 
739 	if (fe->ops.tuner_ops.set_params) {
740 		fe->ops.tuner_ops.set_params(fe);
741 		msleep(100);
742 	}
743 
744 	if (fep->transmission_mode  == TRANSMISSION_MODE_AUTO ||
745 	    fep->guard_interval == GUARD_INTERVAL_AUTO ||
746 	    fep->modulation     == QAM_AUTO ||
747 	    fep->code_rate_HP   == FEC_AUTO) {
748 		int i = 1000, found;
749 
750 		dib3000mc_autosearch_start(fe);
751 		do {
752 			msleep(1);
753 			found = dib3000mc_autosearch_is_irq(fe);
754 		} while (found == 0 && i--);
755 
756 		dprintk("autosearch returns: %d\n",found);
757 		if (found == 0 || found == 1)
758 			return 0; // no channel found
759 
760 		dib3000mc_get_frontend(fe, fep);
761 	}
762 
763 	ret = dib3000mc_tune(fe);
764 
765 	/* make this a config parameter */
766 	dib3000mc_set_output_mode(state, OUTMODE_MPEG2_FIFO);
767 	return ret;
768 }
769 
770 static int dib3000mc_read_status(struct dvb_frontend *fe, enum fe_status *stat)
771 {
772 	struct dib3000mc_state *state = fe->demodulator_priv;
773 	u16 lock = dib3000mc_read_word(state, 509);
774 
775 	*stat = 0;
776 
777 	if (lock & 0x8000)
778 		*stat |= FE_HAS_SIGNAL;
779 	if (lock & 0x3000)
780 		*stat |= FE_HAS_CARRIER;
781 	if (lock & 0x0100)
782 		*stat |= FE_HAS_VITERBI;
783 	if (lock & 0x0010)
784 		*stat |= FE_HAS_SYNC;
785 	if (lock & 0x0008)
786 		*stat |= FE_HAS_LOCK;
787 
788 	return 0;
789 }
790 
791 static int dib3000mc_read_ber(struct dvb_frontend *fe, u32 *ber)
792 {
793 	struct dib3000mc_state *state = fe->demodulator_priv;
794 	*ber = (dib3000mc_read_word(state, 500) << 16) | dib3000mc_read_word(state, 501);
795 	return 0;
796 }
797 
798 static int dib3000mc_read_unc_blocks(struct dvb_frontend *fe, u32 *unc)
799 {
800 	struct dib3000mc_state *state = fe->demodulator_priv;
801 	*unc = dib3000mc_read_word(state, 508);
802 	return 0;
803 }
804 
805 static int dib3000mc_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
806 {
807 	struct dib3000mc_state *state = fe->demodulator_priv;
808 	u16 val = dib3000mc_read_word(state, 392);
809 	*strength = 65535 - val;
810 	return 0;
811 }
812 
813 static int dib3000mc_read_snr(struct dvb_frontend* fe, u16 *snr)
814 {
815 	*snr = 0x0000;
816 	return 0;
817 }
818 
819 static int dib3000mc_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
820 {
821 	tune->min_delay_ms = 1000;
822 	return 0;
823 }
824 
825 static void dib3000mc_release(struct dvb_frontend *fe)
826 {
827 	struct dib3000mc_state *state = fe->demodulator_priv;
828 	dibx000_exit_i2c_master(&state->i2c_master);
829 	kfree(state);
830 }
831 
832 int dib3000mc_pid_control(struct dvb_frontend *fe, int index, int pid,int onoff)
833 {
834 	struct dib3000mc_state *state = fe->demodulator_priv;
835 	dib3000mc_write_word(state, 212 + index,  onoff ? (1 << 13) | pid : 0);
836 	return 0;
837 }
838 EXPORT_SYMBOL(dib3000mc_pid_control);
839 
840 int dib3000mc_pid_parse(struct dvb_frontend *fe, int onoff)
841 {
842 	struct dib3000mc_state *state = fe->demodulator_priv;
843 	u16 tmp = dib3000mc_read_word(state, 206) & ~(1 << 4);
844 	tmp |= (onoff << 4);
845 	return dib3000mc_write_word(state, 206, tmp);
846 }
847 EXPORT_SYMBOL(dib3000mc_pid_parse);
848 
849 void dib3000mc_set_config(struct dvb_frontend *fe, struct dib3000mc_config *cfg)
850 {
851 	struct dib3000mc_state *state = fe->demodulator_priv;
852 	state->cfg = cfg;
853 }
854 EXPORT_SYMBOL(dib3000mc_set_config);
855 
856 int dib3000mc_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib3000mc_config cfg[])
857 {
858 	struct dib3000mc_state *dmcst;
859 	int k;
860 	u8 new_addr;
861 
862 	static const u8 DIB3000MC_I2C_ADDRESS[] = { 20, 22, 24, 26 };
863 
864 	dmcst = kzalloc(sizeof(struct dib3000mc_state), GFP_KERNEL);
865 	if (dmcst == NULL)
866 		return -ENOMEM;
867 
868 	dmcst->i2c_adap = i2c;
869 
870 	for (k = no_of_demods-1; k >= 0; k--) {
871 		dmcst->cfg = &cfg[k];
872 
873 		/* designated i2c address */
874 		new_addr          = DIB3000MC_I2C_ADDRESS[k];
875 		dmcst->i2c_addr = new_addr;
876 		if (dib3000mc_identify(dmcst) != 0) {
877 			dmcst->i2c_addr = default_addr;
878 			if (dib3000mc_identify(dmcst) != 0) {
879 				dprintk("-E-  DiB3000P/MC #%d: not identified\n", k);
880 				kfree(dmcst);
881 				return -ENODEV;
882 			}
883 		}
884 
885 		dib3000mc_set_output_mode(dmcst, OUTMODE_MPEG2_PAR_CONT_CLK);
886 
887 		// set new i2c address and force divstr (Bit 1) to value 0 (Bit 0)
888 		dib3000mc_write_word(dmcst, 1024, (new_addr << 3) | 0x1);
889 		dmcst->i2c_addr = new_addr;
890 	}
891 
892 	for (k = 0; k < no_of_demods; k++) {
893 		dmcst->cfg = &cfg[k];
894 		dmcst->i2c_addr = DIB3000MC_I2C_ADDRESS[k];
895 
896 		dib3000mc_write_word(dmcst, 1024, dmcst->i2c_addr << 3);
897 
898 		/* turn off data output */
899 		dib3000mc_set_output_mode(dmcst, OUTMODE_HIGH_Z);
900 	}
901 
902 	kfree(dmcst);
903 	return 0;
904 }
905 EXPORT_SYMBOL(dib3000mc_i2c_enumeration);
906 
907 static const struct dvb_frontend_ops dib3000mc_ops;
908 
909 struct dvb_frontend * dib3000mc_attach(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib3000mc_config *cfg)
910 {
911 	struct dvb_frontend *demod;
912 	struct dib3000mc_state *st;
913 	st = kzalloc(sizeof(struct dib3000mc_state), GFP_KERNEL);
914 	if (st == NULL)
915 		return NULL;
916 
917 	st->cfg = cfg;
918 	st->i2c_adap = i2c_adap;
919 	st->i2c_addr = i2c_addr;
920 
921 	demod                   = &st->demod;
922 	demod->demodulator_priv = st;
923 	memcpy(&st->demod.ops, &dib3000mc_ops, sizeof(struct dvb_frontend_ops));
924 
925 	if (dib3000mc_identify(st) != 0)
926 		goto error;
927 
928 	dibx000_init_i2c_master(&st->i2c_master, DIB3000MC, st->i2c_adap, st->i2c_addr);
929 
930 	dib3000mc_write_word(st, 1037, 0x3130);
931 
932 	return demod;
933 
934 error:
935 	kfree(st);
936 	return NULL;
937 }
938 EXPORT_SYMBOL_GPL(dib3000mc_attach);
939 
940 static const struct dvb_frontend_ops dib3000mc_ops = {
941 	.delsys = { SYS_DVBT },
942 	.info = {
943 		.name = "DiBcom 3000MC/P",
944 		.frequency_min_hz      =  44250 * kHz,
945 		.frequency_max_hz      = 867250 * kHz,
946 		.frequency_stepsize_hz = 62500,
947 		.caps = FE_CAN_INVERSION_AUTO |
948 			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
949 			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
950 			FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
951 			FE_CAN_TRANSMISSION_MODE_AUTO |
952 			FE_CAN_GUARD_INTERVAL_AUTO |
953 			FE_CAN_RECOVER |
954 			FE_CAN_HIERARCHY_AUTO,
955 	},
956 
957 	.release              = dib3000mc_release,
958 
959 	.init                 = dib3000mc_init,
960 	.sleep                = dib3000mc_sleep,
961 
962 	.set_frontend         = dib3000mc_set_frontend,
963 	.get_tune_settings    = dib3000mc_fe_get_tune_settings,
964 	.get_frontend         = dib3000mc_get_frontend,
965 
966 	.read_status          = dib3000mc_read_status,
967 	.read_ber             = dib3000mc_read_ber,
968 	.read_signal_strength = dib3000mc_read_signal_strength,
969 	.read_snr             = dib3000mc_read_snr,
970 	.read_ucblocks        = dib3000mc_read_unc_blocks,
971 };
972 
973 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@posteo.de>");
974 MODULE_DESCRIPTION("Driver for the DiBcom 3000MC/P COFDM demodulator");
975 MODULE_LICENSE("GPL");
976