1 /*
2     Conexant cx24120/cx24118 - DVBS/S2 Satellite demod/tuner driver
3 
4     Copyright (C) 2008 Patrick Boettcher <pb@linuxtv.org>
5     Copyright (C) 2009 Sergey Tyurin <forum.free-x.de>
6     Updated 2012 by Jannis Achstetter <jannis_achstetter@web.de>
7     Copyright (C) 2015 Jemma Denson <jdenson@gmail.com>
8 	April 2015
9 	    Refactored & simplified driver
10 	    Updated to work with delivery system supplied by DVBv5
11 	    Add frequency, fec & pilot to get_frontend
12 
13 	Cards supported: Technisat Skystar S2
14 
15     This program is free software; you can redistribute it and/or modify
16     it under the terms of the GNU General Public License as published by
17     the Free Software Foundation; either version 2 of the License, or
18     (at your option) any later version.
19 
20     This program is distributed in the hope that it will be useful,
21     but WITHOUT ANY WARRANTY; without even the implied warranty of
22     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23     GNU General Public License for more details.
24 */
25 
26 #include <linux/slab.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/firmware.h>
32 #include <media/dvb_frontend.h>
33 #include "cx24120.h"
34 
35 #define CX24120_SEARCH_RANGE_KHZ 5000
36 #define CX24120_FIRMWARE "dvb-fe-cx24120-1.20.58.2.fw"
37 
38 /* cx24120 i2c registers  */
39 #define CX24120_REG_CMD_START	0x00		/* write cmd_id */
40 #define CX24120_REG_CMD_ARGS	0x01		/* write command arguments */
41 #define CX24120_REG_CMD_END	0x1f		/* write 0x01 for end */
42 
43 #define CX24120_REG_MAILBOX	0x33
44 #define CX24120_REG_FREQ3	0x34		/* frequency */
45 #define CX24120_REG_FREQ2	0x35
46 #define CX24120_REG_FREQ1	0x36
47 
48 #define CX24120_REG_FECMODE	0x39		/* FEC status */
49 #define CX24120_REG_STATUS	0x3a		/* Tuner status */
50 #define CX24120_REG_SIGSTR_H	0x3a		/* Signal strength high */
51 #define CX24120_REG_SIGSTR_L	0x3b		/* Signal strength low byte */
52 #define CX24120_REG_QUALITY_H	0x40		/* SNR high byte */
53 #define CX24120_REG_QUALITY_L	0x41		/* SNR low byte */
54 
55 #define CX24120_REG_BER_HH	0x47		/* BER high byte of high word */
56 #define CX24120_REG_BER_HL	0x48		/* BER low byte of high word */
57 #define CX24120_REG_BER_LH	0x49		/* BER high byte of low word */
58 #define CX24120_REG_BER_LL	0x4a		/* BER low byte of low word */
59 
60 #define CX24120_REG_UCB_H	0x50		/* UCB high byte */
61 #define CX24120_REG_UCB_L	0x51		/* UCB low byte  */
62 
63 #define CX24120_REG_CLKDIV	0xe6
64 #define CX24120_REG_RATEDIV	0xf0
65 
66 #define CX24120_REG_REVISION	0xff		/* Chip revision (ro) */
67 
68 /* Command messages */
69 enum command_message_id {
70 	CMD_VCO_SET		= 0x10,		/* cmd.len = 12; */
71 	CMD_TUNEREQUEST		= 0x11,		/* cmd.len = 15; */
72 
73 	CMD_MPEG_ONOFF		= 0x13,		/* cmd.len = 4; */
74 	CMD_MPEG_INIT		= 0x14,		/* cmd.len = 7; */
75 	CMD_BANDWIDTH		= 0x15,		/* cmd.len = 12; */
76 	CMD_CLOCK_READ		= 0x16,		/* read clock */
77 	CMD_CLOCK_SET		= 0x17,		/* cmd.len = 10; */
78 
79 	CMD_DISEQC_MSG1		= 0x20,		/* cmd.len = 11; */
80 	CMD_DISEQC_MSG2		= 0x21,		/* cmd.len = d->msg_len + 6; */
81 	CMD_SETVOLTAGE		= 0x22,		/* cmd.len = 2; */
82 	CMD_SETTONE		= 0x23,		/* cmd.len = 4; */
83 	CMD_DISEQC_BURST	= 0x24,		/* cmd.len not used !!! */
84 
85 	CMD_READ_SNR		= 0x1a,		/* Read signal strength */
86 	CMD_START_TUNER		= 0x1b,		/* ??? */
87 
88 	CMD_FWVERSION		= 0x35,
89 
90 	CMD_BER_CTRL		= 0x3c,		/* cmd.len = 0x03; */
91 };
92 
93 #define CX24120_MAX_CMD_LEN	30
94 
95 /* pilot mask */
96 #define CX24120_PILOT_OFF	0x00
97 #define CX24120_PILOT_ON	0x40
98 #define CX24120_PILOT_AUTO	0x80
99 
100 /* signal status */
101 #define CX24120_HAS_SIGNAL	0x01
102 #define CX24120_HAS_CARRIER	0x02
103 #define CX24120_HAS_VITERBI	0x04
104 #define CX24120_HAS_LOCK	0x08
105 #define CX24120_HAS_UNK1	0x10
106 #define CX24120_HAS_UNK2	0x20
107 #define CX24120_STATUS_MASK	0x0f
108 #define CX24120_SIGNAL_MASK	0xc0
109 
110 /* ber window */
111 #define CX24120_BER_WINDOW	16
112 #define CX24120_BER_WSIZE	((1 << CX24120_BER_WINDOW) * 208 * 8)
113 
114 #define info(args...) pr_info("cx24120: " args)
115 #define err(args...)  pr_err("cx24120: ### ERROR: " args)
116 
117 /* The Demod/Tuner can't easily provide these, we cache them */
118 struct cx24120_tuning {
119 	u32 frequency;
120 	u32 symbol_rate;
121 	enum fe_spectral_inversion inversion;
122 	enum fe_code_rate fec;
123 
124 	enum fe_delivery_system delsys;
125 	enum fe_modulation modulation;
126 	enum fe_pilot pilot;
127 
128 	/* Demod values */
129 	u8 fec_val;
130 	u8 fec_mask;
131 	u8 clkdiv;
132 	u8 ratediv;
133 	u8 inversion_val;
134 	u8 pilot_val;
135 };
136 
137 /* Private state */
138 struct cx24120_state {
139 	struct i2c_adapter *i2c;
140 	const struct cx24120_config *config;
141 	struct dvb_frontend frontend;
142 
143 	u8 cold_init;
144 	u8 mpeg_enabled;
145 	u8 need_clock_set;
146 
147 	/* current and next tuning parameters */
148 	struct cx24120_tuning dcur;
149 	struct cx24120_tuning dnxt;
150 
151 	enum fe_status fe_status;
152 
153 	/* dvbv5 stats calculations */
154 	u32 bitrate;
155 	u32 berw_usecs;
156 	u32 ber_prev;
157 	u32 ucb_offset;
158 	unsigned long ber_jiffies_stats;
159 	unsigned long per_jiffies_stats;
160 };
161 
162 /* Command message to firmware */
163 struct cx24120_cmd {
164 	u8 id;
165 	u8 len;
166 	u8 arg[CX24120_MAX_CMD_LEN];
167 };
168 
169 /* Read single register */
170 static int cx24120_readreg(struct cx24120_state *state, u8 reg)
171 {
172 	int ret;
173 	u8 buf = 0;
174 	struct i2c_msg msg[] = {
175 		{
176 			.addr = state->config->i2c_addr,
177 			.flags = 0,
178 			.len = 1,
179 			.buf = &reg
180 		}, {
181 			.addr = state->config->i2c_addr,
182 			.flags = I2C_M_RD,
183 			.len = 1,
184 			.buf = &buf
185 		}
186 	};
187 
188 	ret = i2c_transfer(state->i2c, msg, 2);
189 	if (ret != 2) {
190 		err("Read error: reg=0x%02x, ret=%i)\n", reg, ret);
191 		return ret;
192 	}
193 
194 	dev_dbg(&state->i2c->dev, "reg=0x%02x; data=0x%02x\n", reg, buf);
195 
196 	return buf;
197 }
198 
199 /* Write single register */
200 static int cx24120_writereg(struct cx24120_state *state, u8 reg, u8 data)
201 {
202 	u8 buf[] = { reg, data };
203 	struct i2c_msg msg = {
204 		.addr = state->config->i2c_addr,
205 		.flags = 0,
206 		.buf = buf,
207 		.len = 2
208 	};
209 	int ret;
210 
211 	ret = i2c_transfer(state->i2c, &msg, 1);
212 	if (ret != 1) {
213 		err("Write error: i2c_write error(err == %i, 0x%02x: 0x%02x)\n",
214 		    ret, reg, data);
215 		return ret;
216 	}
217 
218 	dev_dbg(&state->i2c->dev, "reg=0x%02x; data=0x%02x\n", reg, data);
219 
220 	return 0;
221 }
222 
223 /* Write multiple registers in chunks of i2c_wr_max-sized buffers */
224 static int cx24120_writeregs(struct cx24120_state *state,
225 			     u8 reg, const u8 *values, u16 len, u8 incr)
226 {
227 	int ret;
228 	u16 max = state->config->i2c_wr_max > 0 ?
229 				state->config->i2c_wr_max :
230 				len;
231 
232 	struct i2c_msg msg = {
233 		.addr = state->config->i2c_addr,
234 		.flags = 0,
235 	};
236 
237 	msg.buf = kmalloc(max + 1, GFP_KERNEL);
238 	if (!msg.buf)
239 		return -ENOMEM;
240 
241 	while (len) {
242 		msg.buf[0] = reg;
243 		msg.len = len > max ? max : len;
244 		memcpy(&msg.buf[1], values, msg.len);
245 
246 		len    -= msg.len;      /* data length revers counter */
247 		values += msg.len;      /* incr data pointer */
248 
249 		if (incr)
250 			reg += msg.len;
251 		msg.len++;              /* don't forget the addr byte */
252 
253 		ret = i2c_transfer(state->i2c, &msg, 1);
254 		if (ret != 1) {
255 			err("i2c_write error(err == %i, 0x%02x)\n", ret, reg);
256 			goto out;
257 		}
258 
259 		dev_dbg(&state->i2c->dev, "reg=0x%02x; data=%*ph\n",
260 			reg, msg.len - 1, msg.buf + 1);
261 	}
262 
263 	ret = 0;
264 
265 out:
266 	kfree(msg.buf);
267 	return ret;
268 }
269 
270 static const struct dvb_frontend_ops cx24120_ops;
271 
272 struct dvb_frontend *cx24120_attach(const struct cx24120_config *config,
273 				    struct i2c_adapter *i2c)
274 {
275 	struct cx24120_state *state;
276 	int demod_rev;
277 
278 	info("Conexant cx24120/cx24118 - DVBS/S2 Satellite demod/tuner\n");
279 	state = kzalloc(sizeof(*state), GFP_KERNEL);
280 	if (!state) {
281 		err("Unable to allocate memory for cx24120_state\n");
282 		goto error;
283 	}
284 
285 	/* setup the state */
286 	state->config = config;
287 	state->i2c = i2c;
288 
289 	/* check if the demod is present and has proper type */
290 	demod_rev = cx24120_readreg(state, CX24120_REG_REVISION);
291 	switch (demod_rev) {
292 	case 0x07:
293 		info("Demod cx24120 rev. 0x07 detected.\n");
294 		break;
295 	case 0x05:
296 		info("Demod cx24120 rev. 0x05 detected.\n");
297 		break;
298 	default:
299 		err("Unsupported demod revision: 0x%x detected.\n", demod_rev);
300 		goto error;
301 	}
302 
303 	/* create dvb_frontend */
304 	state->cold_init = 0;
305 	memcpy(&state->frontend.ops, &cx24120_ops,
306 	       sizeof(struct dvb_frontend_ops));
307 	state->frontend.demodulator_priv = state;
308 
309 	info("Conexant cx24120/cx24118 attached.\n");
310 	return &state->frontend;
311 
312 error:
313 	kfree(state);
314 	return NULL;
315 }
316 EXPORT_SYMBOL(cx24120_attach);
317 
318 static int cx24120_test_rom(struct cx24120_state *state)
319 {
320 	int err, ret;
321 
322 	err = cx24120_readreg(state, 0xfd);
323 	if (err & 4) {
324 		ret = cx24120_readreg(state, 0xdf) & 0xfe;
325 		err = cx24120_writereg(state, 0xdf, ret);
326 	}
327 	return err;
328 }
329 
330 static int cx24120_read_snr(struct dvb_frontend *fe, u16 *snr)
331 {
332 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
333 
334 	if (c->cnr.stat[0].scale != FE_SCALE_DECIBEL)
335 		*snr = 0;
336 	else
337 		*snr = div_s64(c->cnr.stat[0].svalue, 100);
338 
339 	return 0;
340 }
341 
342 static int cx24120_read_ber(struct dvb_frontend *fe, u32 *ber)
343 {
344 	struct cx24120_state *state = fe->demodulator_priv;
345 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
346 
347 	if (c->post_bit_error.stat[0].scale != FE_SCALE_COUNTER) {
348 		*ber = 0;
349 		return 0;
350 	}
351 
352 	*ber = c->post_bit_error.stat[0].uvalue - state->ber_prev;
353 	state->ber_prev = c->post_bit_error.stat[0].uvalue;
354 
355 	return 0;
356 }
357 
358 static int cx24120_msg_mpeg_output_global_config(struct cx24120_state *state,
359 						 u8 flag);
360 
361 /* Check if we're running a command that needs to disable mpeg out */
362 static void cx24120_check_cmd(struct cx24120_state *state, u8 id)
363 {
364 	switch (id) {
365 	case CMD_TUNEREQUEST:
366 	case CMD_CLOCK_READ:
367 	case CMD_DISEQC_MSG1:
368 	case CMD_DISEQC_MSG2:
369 	case CMD_SETVOLTAGE:
370 	case CMD_SETTONE:
371 	case CMD_DISEQC_BURST:
372 		cx24120_msg_mpeg_output_global_config(state, 0);
373 		/* Old driver would do a msleep(100) here */
374 	default:
375 		return;
376 	}
377 }
378 
379 /* Send a message to the firmware */
380 static int cx24120_message_send(struct cx24120_state *state,
381 				struct cx24120_cmd *cmd)
382 {
383 	int ficus;
384 
385 	if (state->mpeg_enabled) {
386 		/* Disable mpeg out on certain commands */
387 		cx24120_check_cmd(state, cmd->id);
388 	}
389 
390 	cx24120_writereg(state, CX24120_REG_CMD_START, cmd->id);
391 	cx24120_writeregs(state, CX24120_REG_CMD_ARGS, &cmd->arg[0],
392 			  cmd->len, 1);
393 	cx24120_writereg(state, CX24120_REG_CMD_END, 0x01);
394 
395 	ficus = 1000;
396 	while (cx24120_readreg(state, CX24120_REG_CMD_END)) {
397 		msleep(20);
398 		ficus -= 20;
399 		if (ficus == 0) {
400 			err("Error sending message to firmware\n");
401 			return -EREMOTEIO;
402 		}
403 	}
404 	dev_dbg(&state->i2c->dev, "sent message 0x%02x\n", cmd->id);
405 
406 	return 0;
407 }
408 
409 /* Send a message and fill arg[] with the results */
410 static int cx24120_message_sendrcv(struct cx24120_state *state,
411 				   struct cx24120_cmd *cmd, u8 numreg)
412 {
413 	int ret, i;
414 
415 	if (numreg > CX24120_MAX_CMD_LEN) {
416 		err("Too many registers to read. cmd->reg = %d", numreg);
417 		return -EREMOTEIO;
418 	}
419 
420 	ret = cx24120_message_send(state, cmd);
421 	if (ret != 0)
422 		return ret;
423 
424 	if (!numreg)
425 		return 0;
426 
427 	/* Read numreg registers starting from register cmd->len */
428 	for (i = 0; i < numreg; i++)
429 		cmd->arg[i] = cx24120_readreg(state, (cmd->len + i + 1));
430 
431 	return 0;
432 }
433 
434 static int cx24120_read_signal_strength(struct dvb_frontend *fe,
435 					u16 *signal_strength)
436 {
437 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
438 
439 	if (c->strength.stat[0].scale != FE_SCALE_RELATIVE)
440 		*signal_strength = 0;
441 	else
442 		*signal_strength = c->strength.stat[0].uvalue;
443 
444 	return 0;
445 }
446 
447 static int cx24120_msg_mpeg_output_global_config(struct cx24120_state *state,
448 						 u8 enable)
449 {
450 	struct cx24120_cmd cmd;
451 	int ret;
452 
453 	cmd.id = CMD_MPEG_ONOFF;
454 	cmd.len = 4;
455 	cmd.arg[0] = 0x01;
456 	cmd.arg[1] = 0x00;
457 	cmd.arg[2] = enable ? 0 : (u8)(-1);
458 	cmd.arg[3] = 0x01;
459 
460 	ret = cx24120_message_send(state, &cmd);
461 	if (ret != 0) {
462 		dev_dbg(&state->i2c->dev, "failed to %s MPEG output\n",
463 			enable ? "enable" : "disable");
464 		return ret;
465 	}
466 
467 	state->mpeg_enabled = enable;
468 	dev_dbg(&state->i2c->dev, "MPEG output %s\n",
469 		enable ? "enabled" : "disabled");
470 
471 	return 0;
472 }
473 
474 static int cx24120_msg_mpeg_output_config(struct cx24120_state *state, u8 seq)
475 {
476 	struct cx24120_cmd cmd;
477 	struct cx24120_initial_mpeg_config i =
478 			state->config->initial_mpeg_config;
479 
480 	cmd.id = CMD_MPEG_INIT;
481 	cmd.len = 7;
482 	cmd.arg[0] = seq; /* sequental number - can be 0,1,2 */
483 	cmd.arg[1] = ((i.x1 & 0x01) << 1) | ((i.x1 >> 1) & 0x01);
484 	cmd.arg[2] = 0x05;
485 	cmd.arg[3] = 0x02;
486 	cmd.arg[4] = ((i.x2 >> 1) & 0x01);
487 	cmd.arg[5] = (i.x2 & 0xf0) | (i.x3 & 0x0f);
488 	cmd.arg[6] = 0x10;
489 
490 	return cx24120_message_send(state, &cmd);
491 }
492 
493 static int cx24120_diseqc_send_burst(struct dvb_frontend *fe,
494 				     enum fe_sec_mini_cmd burst)
495 {
496 	struct cx24120_state *state = fe->demodulator_priv;
497 	struct cx24120_cmd cmd;
498 
499 	dev_dbg(&state->i2c->dev, "\n");
500 
501 	/*
502 	 * Yes, cmd.len is set to zero. The old driver
503 	 * didn't specify any len, but also had a
504 	 * memset 0 before every use of the cmd struct
505 	 * which would have set it to zero.
506 	 * This quite probably needs looking into.
507 	 */
508 	cmd.id = CMD_DISEQC_BURST;
509 	cmd.len = 0;
510 	cmd.arg[0] = 0x00;
511 	cmd.arg[1] = (burst == SEC_MINI_B) ? 0x01 : 0x00;
512 
513 	return cx24120_message_send(state, &cmd);
514 }
515 
516 static int cx24120_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone)
517 {
518 	struct cx24120_state *state = fe->demodulator_priv;
519 	struct cx24120_cmd cmd;
520 
521 	dev_dbg(&state->i2c->dev, "(%d)\n", tone);
522 
523 	if ((tone != SEC_TONE_ON) && (tone != SEC_TONE_OFF)) {
524 		err("Invalid tone=%d\n", tone);
525 		return -EINVAL;
526 	}
527 
528 	cmd.id = CMD_SETTONE;
529 	cmd.len = 4;
530 	cmd.arg[0] = 0x00;
531 	cmd.arg[1] = 0x00;
532 	cmd.arg[2] = 0x00;
533 	cmd.arg[3] = (tone == SEC_TONE_ON) ? 0x01 : 0x00;
534 
535 	return cx24120_message_send(state, &cmd);
536 }
537 
538 static int cx24120_set_voltage(struct dvb_frontend *fe,
539 			       enum fe_sec_voltage voltage)
540 {
541 	struct cx24120_state *state = fe->demodulator_priv;
542 	struct cx24120_cmd cmd;
543 
544 	dev_dbg(&state->i2c->dev, "(%d)\n", voltage);
545 
546 	cmd.id = CMD_SETVOLTAGE;
547 	cmd.len = 2;
548 	cmd.arg[0] = 0x00;
549 	cmd.arg[1] = (voltage == SEC_VOLTAGE_18) ? 0x01 : 0x00;
550 
551 	return cx24120_message_send(state, &cmd);
552 }
553 
554 static int cx24120_send_diseqc_msg(struct dvb_frontend *fe,
555 				   struct dvb_diseqc_master_cmd *d)
556 {
557 	struct cx24120_state *state = fe->demodulator_priv;
558 	struct cx24120_cmd cmd;
559 	int back_count;
560 
561 	dev_dbg(&state->i2c->dev, "\n");
562 
563 	cmd.id = CMD_DISEQC_MSG1;
564 	cmd.len = 11;
565 	cmd.arg[0] = 0x00;
566 	cmd.arg[1] = 0x00;
567 	cmd.arg[2] = 0x03;
568 	cmd.arg[3] = 0x16;
569 	cmd.arg[4] = 0x28;
570 	cmd.arg[5] = 0x01;
571 	cmd.arg[6] = 0x01;
572 	cmd.arg[7] = 0x14;
573 	cmd.arg[8] = 0x19;
574 	cmd.arg[9] = 0x14;
575 	cmd.arg[10] = 0x1e;
576 
577 	if (cx24120_message_send(state, &cmd)) {
578 		err("send 1st message(0x%x) failed\n", cmd.id);
579 		return -EREMOTEIO;
580 	}
581 
582 	cmd.id = CMD_DISEQC_MSG2;
583 	cmd.len = d->msg_len + 6;
584 	cmd.arg[0] = 0x00;
585 	cmd.arg[1] = 0x01;
586 	cmd.arg[2] = 0x02;
587 	cmd.arg[3] = 0x00;
588 	cmd.arg[4] = 0x00;
589 	cmd.arg[5] = d->msg_len;
590 
591 	memcpy(&cmd.arg[6], &d->msg, d->msg_len);
592 
593 	if (cx24120_message_send(state, &cmd)) {
594 		err("send 2nd message(0x%x) failed\n", cmd.id);
595 		return -EREMOTEIO;
596 	}
597 
598 	back_count = 500;
599 	do {
600 		if (!(cx24120_readreg(state, 0x93) & 0x01)) {
601 			dev_dbg(&state->i2c->dev, "diseqc sequence sent\n");
602 			return 0;
603 		}
604 		msleep(20);
605 		back_count -= 20;
606 	} while (back_count);
607 
608 	err("Too long waiting for diseqc.\n");
609 	return -ETIMEDOUT;
610 }
611 
612 static void cx24120_get_stats(struct cx24120_state *state)
613 {
614 	struct dvb_frontend *fe = &state->frontend;
615 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
616 	struct cx24120_cmd cmd;
617 	int ret, cnr, msecs;
618 	u16 sig, ucb;
619 	u32 ber;
620 
621 	dev_dbg(&state->i2c->dev, "\n");
622 
623 	/* signal strength */
624 	if (state->fe_status & FE_HAS_SIGNAL) {
625 		cmd.id = CMD_READ_SNR;
626 		cmd.len = 1;
627 		cmd.arg[0] = 0x00;
628 
629 		ret = cx24120_message_send(state, &cmd);
630 		if (ret != 0) {
631 			err("error reading signal strength\n");
632 			return;
633 		}
634 
635 		/* raw */
636 		sig = cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6;
637 		sig = sig << 8;
638 		sig |= cx24120_readreg(state, CX24120_REG_SIGSTR_L);
639 		dev_dbg(&state->i2c->dev,
640 			"signal strength from firmware = 0x%x\n", sig);
641 
642 		/* cooked */
643 		sig = -100 * sig + 94324;
644 
645 		c->strength.stat[0].scale = FE_SCALE_RELATIVE;
646 		c->strength.stat[0].uvalue = sig;
647 	} else {
648 		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
649 	}
650 
651 	/* CNR */
652 	if (state->fe_status & FE_HAS_VITERBI) {
653 		cnr = cx24120_readreg(state, CX24120_REG_QUALITY_H) << 8;
654 		cnr |= cx24120_readreg(state, CX24120_REG_QUALITY_L);
655 		dev_dbg(&state->i2c->dev, "read SNR index = %d\n", cnr);
656 
657 		/* guessed - seems about right */
658 		cnr = cnr * 100;
659 
660 		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
661 		c->cnr.stat[0].svalue = cnr;
662 	} else {
663 		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
664 	}
665 
666 	/* BER & UCB require lock */
667 	if (!(state->fe_status & FE_HAS_LOCK)) {
668 		c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
669 		c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
670 		c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
671 		c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
672 		return;
673 	}
674 
675 	/* BER */
676 	if (time_after(jiffies, state->ber_jiffies_stats)) {
677 		msecs = (state->berw_usecs + 500) / 1000;
678 		state->ber_jiffies_stats = jiffies + msecs_to_jiffies(msecs);
679 
680 		ber = cx24120_readreg(state, CX24120_REG_BER_HH) << 24;
681 		ber |= cx24120_readreg(state, CX24120_REG_BER_HL) << 16;
682 		ber |= cx24120_readreg(state, CX24120_REG_BER_LH) << 8;
683 		ber |= cx24120_readreg(state, CX24120_REG_BER_LL);
684 		dev_dbg(&state->i2c->dev, "read BER index = %d\n", ber);
685 
686 		c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
687 		c->post_bit_error.stat[0].uvalue += ber;
688 
689 		c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
690 		c->post_bit_count.stat[0].uvalue += CX24120_BER_WSIZE;
691 	}
692 
693 	/* UCB */
694 	if (time_after(jiffies, state->per_jiffies_stats)) {
695 		state->per_jiffies_stats = jiffies + msecs_to_jiffies(1000);
696 
697 		ucb = cx24120_readreg(state, CX24120_REG_UCB_H) << 8;
698 		ucb |= cx24120_readreg(state, CX24120_REG_UCB_L);
699 		dev_dbg(&state->i2c->dev, "ucblocks = %d\n", ucb);
700 
701 		/* handle reset */
702 		if (ucb < state->ucb_offset)
703 			state->ucb_offset = c->block_error.stat[0].uvalue;
704 
705 		c->block_error.stat[0].scale = FE_SCALE_COUNTER;
706 		c->block_error.stat[0].uvalue = ucb + state->ucb_offset;
707 
708 		c->block_count.stat[0].scale = FE_SCALE_COUNTER;
709 		c->block_count.stat[0].uvalue += state->bitrate / 8 / 208;
710 	}
711 }
712 
713 static void cx24120_set_clock_ratios(struct dvb_frontend *fe);
714 
715 /* Read current tuning status */
716 static int cx24120_read_status(struct dvb_frontend *fe, enum fe_status *status)
717 {
718 	struct cx24120_state *state = fe->demodulator_priv;
719 	int lock;
720 
721 	lock = cx24120_readreg(state, CX24120_REG_STATUS);
722 
723 	dev_dbg(&state->i2c->dev, "status = 0x%02x\n", lock);
724 
725 	*status = 0;
726 
727 	if (lock & CX24120_HAS_SIGNAL)
728 		*status = FE_HAS_SIGNAL;
729 	if (lock & CX24120_HAS_CARRIER)
730 		*status |= FE_HAS_CARRIER;
731 	if (lock & CX24120_HAS_VITERBI)
732 		*status |= FE_HAS_VITERBI | FE_HAS_SYNC;
733 	if (lock & CX24120_HAS_LOCK)
734 		*status |= FE_HAS_LOCK;
735 
736 	/*
737 	 * TODO: is FE_HAS_SYNC in the right place?
738 	 * Other cx241xx drivers have this slightly
739 	 * different
740 	 */
741 
742 	state->fe_status = *status;
743 	cx24120_get_stats(state);
744 
745 	/* Set the clock once tuned in */
746 	if (state->need_clock_set && *status & FE_HAS_LOCK) {
747 		/* Set clock ratios */
748 		cx24120_set_clock_ratios(fe);
749 
750 		/* Old driver would do a msleep(200) here */
751 
752 		/* Renable mpeg output */
753 		if (!state->mpeg_enabled)
754 			cx24120_msg_mpeg_output_global_config(state, 1);
755 
756 		state->need_clock_set = 0;
757 	}
758 
759 	return 0;
760 }
761 
762 /*
763  * FEC & modulation lookup table
764  * Used for decoding the REG_FECMODE register
765  * once tuned in.
766  */
767 struct cx24120_modfec {
768 	enum fe_delivery_system delsys;
769 	enum fe_modulation mod;
770 	enum fe_code_rate fec;
771 	u8 val;
772 };
773 
774 static const struct cx24120_modfec modfec_lookup_table[] = {
775 	/*delsys     mod    fec       val */
776 	{ SYS_DVBS,  QPSK,  FEC_1_2,  0x01 },
777 	{ SYS_DVBS,  QPSK,  FEC_2_3,  0x02 },
778 	{ SYS_DVBS,  QPSK,  FEC_3_4,  0x03 },
779 	{ SYS_DVBS,  QPSK,  FEC_4_5,  0x04 },
780 	{ SYS_DVBS,  QPSK,  FEC_5_6,  0x05 },
781 	{ SYS_DVBS,  QPSK,  FEC_6_7,  0x06 },
782 	{ SYS_DVBS,  QPSK,  FEC_7_8,  0x07 },
783 
784 	{ SYS_DVBS2, QPSK,  FEC_1_2,  0x04 },
785 	{ SYS_DVBS2, QPSK,  FEC_3_5,  0x05 },
786 	{ SYS_DVBS2, QPSK,  FEC_2_3,  0x06 },
787 	{ SYS_DVBS2, QPSK,  FEC_3_4,  0x07 },
788 	{ SYS_DVBS2, QPSK,  FEC_4_5,  0x08 },
789 	{ SYS_DVBS2, QPSK,  FEC_5_6,  0x09 },
790 	{ SYS_DVBS2, QPSK,  FEC_8_9,  0x0a },
791 	{ SYS_DVBS2, QPSK,  FEC_9_10, 0x0b },
792 
793 	{ SYS_DVBS2, PSK_8, FEC_3_5,  0x0c },
794 	{ SYS_DVBS2, PSK_8, FEC_2_3,  0x0d },
795 	{ SYS_DVBS2, PSK_8, FEC_3_4,  0x0e },
796 	{ SYS_DVBS2, PSK_8, FEC_5_6,  0x0f },
797 	{ SYS_DVBS2, PSK_8, FEC_8_9,  0x10 },
798 	{ SYS_DVBS2, PSK_8, FEC_9_10, 0x11 },
799 };
800 
801 /* Retrieve current fec, modulation & pilot values */
802 static int cx24120_get_fec(struct dvb_frontend *fe)
803 {
804 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
805 	struct cx24120_state *state = fe->demodulator_priv;
806 	int idx;
807 	int ret;
808 	int fec;
809 
810 	ret = cx24120_readreg(state, CX24120_REG_FECMODE);
811 	fec = ret & 0x3f; /* Lower 6 bits */
812 
813 	dev_dbg(&state->i2c->dev, "raw fec = %d\n", fec);
814 
815 	for (idx = 0; idx < ARRAY_SIZE(modfec_lookup_table); idx++) {
816 		if (modfec_lookup_table[idx].delsys != state->dcur.delsys)
817 			continue;
818 		if (modfec_lookup_table[idx].val != fec)
819 			continue;
820 
821 		break; /* found */
822 	}
823 
824 	if (idx >= ARRAY_SIZE(modfec_lookup_table)) {
825 		dev_dbg(&state->i2c->dev, "couldn't find fec!\n");
826 		return -EINVAL;
827 	}
828 
829 	/* save values back to cache */
830 	c->modulation = modfec_lookup_table[idx].mod;
831 	c->fec_inner = modfec_lookup_table[idx].fec;
832 	c->pilot = (ret & 0x80) ? PILOT_ON : PILOT_OFF;
833 
834 	dev_dbg(&state->i2c->dev, "mod(%d), fec(%d), pilot(%d)\n",
835 		c->modulation, c->fec_inner, c->pilot);
836 
837 	return 0;
838 }
839 
840 /* Calculate ber window time */
841 static void cx24120_calculate_ber_window(struct cx24120_state *state, u32 rate)
842 {
843 	struct dvb_frontend *fe = &state->frontend;
844 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
845 	u64 tmp;
846 
847 	/*
848 	 * Calculate bitrate from rate in the clock ratios table.
849 	 * This isn't *exactly* right but close enough.
850 	 */
851 	tmp = (u64)c->symbol_rate * rate;
852 	do_div(tmp, 256);
853 	state->bitrate = tmp;
854 
855 	/* usecs per ber window */
856 	tmp = 1000000ULL * CX24120_BER_WSIZE;
857 	do_div(tmp, state->bitrate);
858 	state->berw_usecs = tmp;
859 
860 	dev_dbg(&state->i2c->dev, "bitrate: %u, berw_usecs: %u\n",
861 		state->bitrate, state->berw_usecs);
862 }
863 
864 /*
865  * Clock ratios lookup table
866  *
867  * Values obtained from much larger table in old driver
868  * which had numerous entries which would never match.
869  *
870  * There's probably some way of calculating these but I
871  * can't determine the pattern
872  */
873 struct cx24120_clock_ratios_table {
874 	enum fe_delivery_system delsys;
875 	enum fe_pilot pilot;
876 	enum fe_modulation mod;
877 	enum fe_code_rate fec;
878 	u32 m_rat;
879 	u32 n_rat;
880 	u32 rate;
881 };
882 
883 static const struct cx24120_clock_ratios_table clock_ratios_table[] = {
884 	/*delsys     pilot      mod    fec       m_rat    n_rat   rate */
885 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_1_2,  273088,  254505, 274 },
886 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_3_5,  17272,   13395,  330 },
887 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_2_3,  24344,   16967,  367 },
888 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_3_4,  410788,  254505, 413 },
889 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_4_5,  438328,  254505, 440 },
890 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_5_6,  30464,   16967,  459 },
891 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_8_9,  487832,  254505, 490 },
892 	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_9_10, 493952,  254505, 496 },
893 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_3_5,  328168,  169905, 494 },
894 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_2_3,  24344,   11327,  550 },
895 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_3_4,  410788,  169905, 618 },
896 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_5_6,  30464,   11327,  688 },
897 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_8_9,  487832,  169905, 735 },
898 	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_9_10, 493952,  169905, 744 },
899 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_1_2,  273088,  260709, 268 },
900 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_3_5,  328168,  260709, 322 },
901 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_2_3,  121720,  86903,  358 },
902 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_3_4,  410788,  260709, 403 },
903 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_4_5,  438328,  260709, 430 },
904 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_5_6,  152320,  86903,  448 },
905 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_8_9,  487832,  260709, 479 },
906 	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_9_10, 493952,  260709, 485 },
907 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_3_5,  328168,  173853, 483 },
908 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_2_3,  121720,  57951,  537 },
909 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_3_4,  410788,  173853, 604 },
910 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_5_6,  152320,  57951,  672 },
911 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_8_9,  487832,  173853, 718 },
912 	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_9_10, 493952,  173853, 727 },
913 	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_1_2,  152592,  152592, 256 },
914 	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_2_3,  305184,  228888, 341 },
915 	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_3_4,  457776,  305184, 384 },
916 	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_5_6,  762960,  457776, 427 },
917 	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_7_8,  1068144, 610368, 448 },
918 };
919 
920 /* Set clock ratio from lookup table */
921 static void cx24120_set_clock_ratios(struct dvb_frontend *fe)
922 {
923 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
924 	struct cx24120_state *state = fe->demodulator_priv;
925 	struct cx24120_cmd cmd;
926 	int ret, idx;
927 
928 	/* Find fec, modulation, pilot */
929 	ret = cx24120_get_fec(fe);
930 	if (ret != 0)
931 		return;
932 
933 	/* Find the clock ratios in the lookup table */
934 	for (idx = 0; idx < ARRAY_SIZE(clock_ratios_table); idx++) {
935 		if (clock_ratios_table[idx].delsys != state->dcur.delsys)
936 			continue;
937 		if (clock_ratios_table[idx].mod != c->modulation)
938 			continue;
939 		if (clock_ratios_table[idx].fec != c->fec_inner)
940 			continue;
941 		if (clock_ratios_table[idx].pilot != c->pilot)
942 			continue;
943 
944 		break;		/* found */
945 	}
946 
947 	if (idx >= ARRAY_SIZE(clock_ratios_table)) {
948 		info("Clock ratio not found - data reception in danger\n");
949 		return;
950 	}
951 
952 	/* Read current values? */
953 	cmd.id = CMD_CLOCK_READ;
954 	cmd.len = 1;
955 	cmd.arg[0] = 0x00;
956 	ret = cx24120_message_sendrcv(state, &cmd, 6);
957 	if (ret != 0)
958 		return;
959 	/* in cmd[0]-[5] - result */
960 
961 	dev_dbg(&state->i2c->dev, "m=%d, n=%d; idx: %d m=%d, n=%d, rate=%d\n",
962 		cmd.arg[2] | (cmd.arg[1] << 8) | (cmd.arg[0] << 16),
963 		cmd.arg[5] | (cmd.arg[4] << 8) | (cmd.arg[3] << 16),
964 		idx,
965 		clock_ratios_table[idx].m_rat,
966 		clock_ratios_table[idx].n_rat,
967 		clock_ratios_table[idx].rate);
968 
969 	/* Set the clock */
970 	cmd.id = CMD_CLOCK_SET;
971 	cmd.len = 10;
972 	cmd.arg[0] = 0;
973 	cmd.arg[1] = 0x10;
974 	cmd.arg[2] = (clock_ratios_table[idx].m_rat >> 16) & 0xff;
975 	cmd.arg[3] = (clock_ratios_table[idx].m_rat >>  8) & 0xff;
976 	cmd.arg[4] = (clock_ratios_table[idx].m_rat >>  0) & 0xff;
977 	cmd.arg[5] = (clock_ratios_table[idx].n_rat >> 16) & 0xff;
978 	cmd.arg[6] = (clock_ratios_table[idx].n_rat >>  8) & 0xff;
979 	cmd.arg[7] = (clock_ratios_table[idx].n_rat >>  0) & 0xff;
980 	cmd.arg[8] = (clock_ratios_table[idx].rate >> 8) & 0xff;
981 	cmd.arg[9] = (clock_ratios_table[idx].rate >> 0) & 0xff;
982 
983 	cx24120_message_send(state, &cmd);
984 
985 	/* Calculate ber window rates for stat work */
986 	cx24120_calculate_ber_window(state, clock_ratios_table[idx].rate);
987 }
988 
989 /* Set inversion value */
990 static int cx24120_set_inversion(struct cx24120_state *state,
991 				 enum fe_spectral_inversion inversion)
992 {
993 	dev_dbg(&state->i2c->dev, "(%d)\n", inversion);
994 
995 	switch (inversion) {
996 	case INVERSION_OFF:
997 		state->dnxt.inversion_val = 0x00;
998 		break;
999 	case INVERSION_ON:
1000 		state->dnxt.inversion_val = 0x04;
1001 		break;
1002 	case INVERSION_AUTO:
1003 		state->dnxt.inversion_val = 0x0c;
1004 		break;
1005 	default:
1006 		return -EINVAL;
1007 	}
1008 
1009 	state->dnxt.inversion = inversion;
1010 
1011 	return 0;
1012 }
1013 
1014 /* FEC lookup table for tuning */
1015 struct cx24120_modfec_table {
1016 	enum fe_delivery_system delsys;
1017 	enum fe_modulation mod;
1018 	enum fe_code_rate fec;
1019 	u8 val;
1020 };
1021 
1022 static const struct cx24120_modfec_table modfec_table[] = {
1023 	/*delsys     mod    fec       val */
1024 	{ SYS_DVBS,  QPSK,  FEC_1_2,  0x2e },
1025 	{ SYS_DVBS,  QPSK,  FEC_2_3,  0x2f },
1026 	{ SYS_DVBS,  QPSK,  FEC_3_4,  0x30 },
1027 	{ SYS_DVBS,  QPSK,  FEC_5_6,  0x31 },
1028 	{ SYS_DVBS,  QPSK,  FEC_6_7,  0x32 },
1029 	{ SYS_DVBS,  QPSK,  FEC_7_8,  0x33 },
1030 
1031 	{ SYS_DVBS2, QPSK,  FEC_1_2,  0x04 },
1032 	{ SYS_DVBS2, QPSK,  FEC_3_5,  0x05 },
1033 	{ SYS_DVBS2, QPSK,  FEC_2_3,  0x06 },
1034 	{ SYS_DVBS2, QPSK,  FEC_3_4,  0x07 },
1035 	{ SYS_DVBS2, QPSK,  FEC_4_5,  0x08 },
1036 	{ SYS_DVBS2, QPSK,  FEC_5_6,  0x09 },
1037 	{ SYS_DVBS2, QPSK,  FEC_8_9,  0x0a },
1038 	{ SYS_DVBS2, QPSK,  FEC_9_10, 0x0b },
1039 
1040 	{ SYS_DVBS2, PSK_8, FEC_3_5,  0x0c },
1041 	{ SYS_DVBS2, PSK_8, FEC_2_3,  0x0d },
1042 	{ SYS_DVBS2, PSK_8, FEC_3_4,  0x0e },
1043 	{ SYS_DVBS2, PSK_8, FEC_5_6,  0x0f },
1044 	{ SYS_DVBS2, PSK_8, FEC_8_9,  0x10 },
1045 	{ SYS_DVBS2, PSK_8, FEC_9_10, 0x11 },
1046 };
1047 
1048 /* Set fec_val & fec_mask values from delsys, modulation & fec */
1049 static int cx24120_set_fec(struct cx24120_state *state, enum fe_modulation mod,
1050 			   enum fe_code_rate fec)
1051 {
1052 	int idx;
1053 
1054 	dev_dbg(&state->i2c->dev, "(0x%02x,0x%02x)\n", mod, fec);
1055 
1056 	state->dnxt.fec = fec;
1057 
1058 	/* Lookup fec_val from modfec table */
1059 	for (idx = 0; idx < ARRAY_SIZE(modfec_table); idx++) {
1060 		if (modfec_table[idx].delsys != state->dnxt.delsys)
1061 			continue;
1062 		if (modfec_table[idx].mod != mod)
1063 			continue;
1064 		if (modfec_table[idx].fec != fec)
1065 			continue;
1066 
1067 		/* found */
1068 		state->dnxt.fec_mask = 0x00;
1069 		state->dnxt.fec_val = modfec_table[idx].val;
1070 		return 0;
1071 	}
1072 
1073 	if (state->dnxt.delsys == SYS_DVBS2) {
1074 		/* DVBS2 auto is 0x00/0x00 */
1075 		state->dnxt.fec_mask = 0x00;
1076 		state->dnxt.fec_val  = 0x00;
1077 	} else {
1078 		/* Set DVB-S to auto */
1079 		state->dnxt.fec_val  = 0x2e;
1080 		state->dnxt.fec_mask = 0xac;
1081 	}
1082 
1083 	return 0;
1084 }
1085 
1086 /* Set pilot */
1087 static int cx24120_set_pilot(struct cx24120_state *state, enum fe_pilot pilot)
1088 {
1089 	dev_dbg(&state->i2c->dev, "(%d)\n", pilot);
1090 
1091 	/* Pilot only valid in DVBS2 */
1092 	if (state->dnxt.delsys != SYS_DVBS2) {
1093 		state->dnxt.pilot_val = CX24120_PILOT_OFF;
1094 		return 0;
1095 	}
1096 
1097 	switch (pilot) {
1098 	case PILOT_OFF:
1099 		state->dnxt.pilot_val = CX24120_PILOT_OFF;
1100 		break;
1101 	case PILOT_ON:
1102 		state->dnxt.pilot_val = CX24120_PILOT_ON;
1103 		break;
1104 	case PILOT_AUTO:
1105 	default:
1106 		state->dnxt.pilot_val = CX24120_PILOT_AUTO;
1107 	}
1108 
1109 	return 0;
1110 }
1111 
1112 /* Set symbol rate */
1113 static int cx24120_set_symbolrate(struct cx24120_state *state, u32 rate)
1114 {
1115 	dev_dbg(&state->i2c->dev, "(%d)\n", rate);
1116 
1117 	state->dnxt.symbol_rate = rate;
1118 
1119 	/* Check symbol rate */
1120 	if (rate  > 31000000) {
1121 		state->dnxt.clkdiv  = (-(rate < 31000001) & 3) + 2;
1122 		state->dnxt.ratediv = (-(rate < 31000001) & 6) + 4;
1123 	} else {
1124 		state->dnxt.clkdiv  = 3;
1125 		state->dnxt.ratediv = 6;
1126 	}
1127 
1128 	return 0;
1129 }
1130 
1131 /* Overwrite the current tuning params, we are about to tune */
1132 static void cx24120_clone_params(struct dvb_frontend *fe)
1133 {
1134 	struct cx24120_state *state = fe->demodulator_priv;
1135 
1136 	state->dcur = state->dnxt;
1137 }
1138 
1139 static int cx24120_set_frontend(struct dvb_frontend *fe)
1140 {
1141 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1142 	struct cx24120_state *state = fe->demodulator_priv;
1143 	struct cx24120_cmd cmd;
1144 	int ret;
1145 
1146 	switch (c->delivery_system) {
1147 	case SYS_DVBS2:
1148 		dev_dbg(&state->i2c->dev, "DVB-S2\n");
1149 		break;
1150 	case SYS_DVBS:
1151 		dev_dbg(&state->i2c->dev, "DVB-S\n");
1152 		break;
1153 	default:
1154 		dev_dbg(&state->i2c->dev,
1155 			"delivery system(%d) not supported\n",
1156 			c->delivery_system);
1157 		return -EINVAL;
1158 	}
1159 
1160 	state->dnxt.delsys = c->delivery_system;
1161 	state->dnxt.modulation = c->modulation;
1162 	state->dnxt.frequency = c->frequency;
1163 	state->dnxt.pilot = c->pilot;
1164 
1165 	ret = cx24120_set_inversion(state, c->inversion);
1166 	if (ret !=  0)
1167 		return ret;
1168 
1169 	ret = cx24120_set_fec(state, c->modulation, c->fec_inner);
1170 	if (ret !=  0)
1171 		return ret;
1172 
1173 	ret = cx24120_set_pilot(state, c->pilot);
1174 	if (ret != 0)
1175 		return ret;
1176 
1177 	ret = cx24120_set_symbolrate(state, c->symbol_rate);
1178 	if (ret !=  0)
1179 		return ret;
1180 
1181 	/* discard the 'current' tuning parameters and prepare to tune */
1182 	cx24120_clone_params(fe);
1183 
1184 	dev_dbg(&state->i2c->dev,
1185 		"delsys      = %d\n", state->dcur.delsys);
1186 	dev_dbg(&state->i2c->dev,
1187 		"modulation  = %d\n", state->dcur.modulation);
1188 	dev_dbg(&state->i2c->dev,
1189 		"frequency   = %d\n", state->dcur.frequency);
1190 	dev_dbg(&state->i2c->dev,
1191 		"pilot       = %d (val = 0x%02x)\n",
1192 		state->dcur.pilot, state->dcur.pilot_val);
1193 	dev_dbg(&state->i2c->dev,
1194 		"symbol_rate = %d (clkdiv/ratediv = 0x%02x/0x%02x)\n",
1195 		 state->dcur.symbol_rate,
1196 		 state->dcur.clkdiv, state->dcur.ratediv);
1197 	dev_dbg(&state->i2c->dev,
1198 		"FEC         = %d (mask/val = 0x%02x/0x%02x)\n",
1199 		state->dcur.fec, state->dcur.fec_mask, state->dcur.fec_val);
1200 	dev_dbg(&state->i2c->dev,
1201 		"Inversion   = %d (val = 0x%02x)\n",
1202 		state->dcur.inversion, state->dcur.inversion_val);
1203 
1204 	/* Flag that clock needs to be set after tune */
1205 	state->need_clock_set = 1;
1206 
1207 	/* Tune in */
1208 	cmd.id = CMD_TUNEREQUEST;
1209 	cmd.len = 15;
1210 	cmd.arg[0] = 0;
1211 	cmd.arg[1]  = (state->dcur.frequency & 0xff0000) >> 16;
1212 	cmd.arg[2]  = (state->dcur.frequency & 0x00ff00) >> 8;
1213 	cmd.arg[3]  = (state->dcur.frequency & 0x0000ff);
1214 	cmd.arg[4]  = ((state->dcur.symbol_rate / 1000) & 0xff00) >> 8;
1215 	cmd.arg[5]  = ((state->dcur.symbol_rate / 1000) & 0x00ff);
1216 	cmd.arg[6]  = state->dcur.inversion;
1217 	cmd.arg[7]  = state->dcur.fec_val | state->dcur.pilot_val;
1218 	cmd.arg[8]  = CX24120_SEARCH_RANGE_KHZ >> 8;
1219 	cmd.arg[9]  = CX24120_SEARCH_RANGE_KHZ & 0xff;
1220 	cmd.arg[10] = 0;		/* maybe rolloff? */
1221 	cmd.arg[11] = state->dcur.fec_mask;
1222 	cmd.arg[12] = state->dcur.ratediv;
1223 	cmd.arg[13] = state->dcur.clkdiv;
1224 	cmd.arg[14] = 0;
1225 
1226 	/* Send tune command */
1227 	ret = cx24120_message_send(state, &cmd);
1228 	if (ret != 0)
1229 		return ret;
1230 
1231 	/* Write symbol rate values */
1232 	ret = cx24120_writereg(state, CX24120_REG_CLKDIV, state->dcur.clkdiv);
1233 	ret = cx24120_readreg(state, CX24120_REG_RATEDIV);
1234 	ret &= 0xfffffff0;
1235 	ret |= state->dcur.ratediv;
1236 	ret = cx24120_writereg(state, CX24120_REG_RATEDIV, ret);
1237 
1238 	return 0;
1239 }
1240 
1241 /* Set vco from config */
1242 static int cx24120_set_vco(struct cx24120_state *state)
1243 {
1244 	struct cx24120_cmd cmd;
1245 	u32 nxtal_khz, vco;
1246 	u64 inv_vco;
1247 	u32 xtal_khz = state->config->xtal_khz;
1248 
1249 	nxtal_khz = xtal_khz * 4;
1250 	vco = nxtal_khz * 10;
1251 	inv_vco = DIV_ROUND_CLOSEST_ULL(0x400000000ULL, vco);
1252 
1253 	dev_dbg(&state->i2c->dev, "xtal=%d, vco=%d, inv_vco=%lld\n",
1254 		xtal_khz, vco, inv_vco);
1255 
1256 	cmd.id = CMD_VCO_SET;
1257 	cmd.len = 12;
1258 	cmd.arg[0] = (vco >> 16) & 0xff;
1259 	cmd.arg[1] = (vco >> 8) & 0xff;
1260 	cmd.arg[2] = vco & 0xff;
1261 	cmd.arg[3] = (inv_vco >> 8) & 0xff;
1262 	cmd.arg[4] = (inv_vco) & 0xff;
1263 	cmd.arg[5] = 0x03;
1264 	cmd.arg[6] = (nxtal_khz >> 8) & 0xff;
1265 	cmd.arg[7] = nxtal_khz & 0xff;
1266 	cmd.arg[8] = 0x06;
1267 	cmd.arg[9] = 0x03;
1268 	cmd.arg[10] = (xtal_khz >> 16) & 0xff;
1269 	cmd.arg[11] = xtal_khz & 0xff;
1270 
1271 	return cx24120_message_send(state, &cmd);
1272 }
1273 
1274 static int cx24120_init(struct dvb_frontend *fe)
1275 {
1276 	const struct firmware *fw;
1277 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1278 	struct cx24120_state *state = fe->demodulator_priv;
1279 	struct cx24120_cmd cmd;
1280 	u8 reg;
1281 	int ret, i;
1282 	unsigned char vers[4];
1283 
1284 	if (state->cold_init)
1285 		return 0;
1286 
1287 	/* ???? */
1288 	cx24120_writereg(state, 0xea, 0x00);
1289 	cx24120_test_rom(state);
1290 	reg = cx24120_readreg(state, 0xfb) & 0xfe;
1291 	cx24120_writereg(state, 0xfb, reg);
1292 	reg = cx24120_readreg(state, 0xfc) & 0xfe;
1293 	cx24120_writereg(state, 0xfc, reg);
1294 	cx24120_writereg(state, 0xc3, 0x04);
1295 	cx24120_writereg(state, 0xc4, 0x04);
1296 	cx24120_writereg(state, 0xce, 0x00);
1297 	cx24120_writereg(state, 0xcf, 0x00);
1298 	reg = cx24120_readreg(state, 0xea) & 0xfe;
1299 	cx24120_writereg(state, 0xea, reg);
1300 	cx24120_writereg(state, 0xeb, 0x0c);
1301 	cx24120_writereg(state, 0xec, 0x06);
1302 	cx24120_writereg(state, 0xed, 0x05);
1303 	cx24120_writereg(state, 0xee, 0x03);
1304 	cx24120_writereg(state, 0xef, 0x05);
1305 	cx24120_writereg(state, 0xf3, 0x03);
1306 	cx24120_writereg(state, 0xf4, 0x44);
1307 
1308 	for (i = 0; i < 3; i++) {
1309 		cx24120_writereg(state, 0xf0 + i, 0x04);
1310 		cx24120_writereg(state, 0xe6 + i, 0x02);
1311 	}
1312 
1313 	cx24120_writereg(state, 0xea, (reg | 0x01));
1314 	for (i = 0; i < 6; i += 2) {
1315 		cx24120_writereg(state, 0xc5 + i, 0x00);
1316 		cx24120_writereg(state, 0xc6 + i, 0x00);
1317 	}
1318 
1319 	cx24120_writereg(state, 0xe4, 0x03);
1320 	cx24120_writereg(state, 0xeb, 0x0a);
1321 
1322 	dev_dbg(&state->i2c->dev, "requesting firmware (%s) to download...\n",
1323 		CX24120_FIRMWARE);
1324 
1325 	ret = state->config->request_firmware(fe, &fw, CX24120_FIRMWARE);
1326 	if (ret) {
1327 		err("Could not load firmware (%s): %d\n", CX24120_FIRMWARE,
1328 		    ret);
1329 		return ret;
1330 	}
1331 
1332 	dev_dbg(&state->i2c->dev,
1333 		"Firmware found, size %d bytes (%02x %02x .. %02x %02x)\n",
1334 		(int)fw->size,			/* firmware_size in bytes */
1335 		fw->data[0],			/* fw 1st byte */
1336 		fw->data[1],			/* fw 2d byte */
1337 		fw->data[fw->size - 2],		/* fw before last byte */
1338 		fw->data[fw->size - 1]);	/* fw last byte */
1339 
1340 	cx24120_test_rom(state);
1341 	reg = cx24120_readreg(state, 0xfb) & 0xfe;
1342 	cx24120_writereg(state, 0xfb, reg);
1343 	cx24120_writereg(state, 0xe0, 0x76);
1344 	cx24120_writereg(state, 0xf7, 0x81);
1345 	cx24120_writereg(state, 0xf8, 0x00);
1346 	cx24120_writereg(state, 0xf9, 0x00);
1347 	cx24120_writeregs(state, 0xfa, fw->data, (fw->size - 1), 0x00);
1348 	cx24120_writereg(state, 0xf7, 0xc0);
1349 	cx24120_writereg(state, 0xe0, 0x00);
1350 	reg = (fw->size - 2) & 0x00ff;
1351 	cx24120_writereg(state, 0xf8, reg);
1352 	reg = ((fw->size - 2) >> 8) & 0x00ff;
1353 	cx24120_writereg(state, 0xf9, reg);
1354 	cx24120_writereg(state, 0xf7, 0x00);
1355 	cx24120_writereg(state, 0xdc, 0x00);
1356 	cx24120_writereg(state, 0xdc, 0x07);
1357 	msleep(500);
1358 
1359 	/* Check final byte matches final byte of firmware */
1360 	reg = cx24120_readreg(state, 0xe1);
1361 	if (reg == fw->data[fw->size - 1]) {
1362 		dev_dbg(&state->i2c->dev, "Firmware uploaded successfully\n");
1363 		ret = 0;
1364 	} else {
1365 		err("Firmware upload failed. Last byte returned=0x%x\n", ret);
1366 		ret = -EREMOTEIO;
1367 	}
1368 	cx24120_writereg(state, 0xdc, 0x00);
1369 	release_firmware(fw);
1370 	if (ret != 0)
1371 		return ret;
1372 
1373 	/* Start tuner */
1374 	cmd.id = CMD_START_TUNER;
1375 	cmd.len = 3;
1376 	cmd.arg[0] = 0x00;
1377 	cmd.arg[1] = 0x00;
1378 	cmd.arg[2] = 0x00;
1379 
1380 	if (cx24120_message_send(state, &cmd) != 0) {
1381 		err("Error tuner start! :(\n");
1382 		return -EREMOTEIO;
1383 	}
1384 
1385 	/* Set VCO */
1386 	ret = cx24120_set_vco(state);
1387 	if (ret != 0) {
1388 		err("Error set VCO! :(\n");
1389 		return ret;
1390 	}
1391 
1392 	/* set bandwidth */
1393 	cmd.id = CMD_BANDWIDTH;
1394 	cmd.len = 12;
1395 	cmd.arg[0] = 0x00;
1396 	cmd.arg[1] = 0x00;
1397 	cmd.arg[2] = 0x00;
1398 	cmd.arg[3] = 0x00;
1399 	cmd.arg[4] = 0x05;
1400 	cmd.arg[5] = 0x02;
1401 	cmd.arg[6] = 0x02;
1402 	cmd.arg[7] = 0x00;
1403 	cmd.arg[8] = 0x05;
1404 	cmd.arg[9] = 0x02;
1405 	cmd.arg[10] = 0x02;
1406 	cmd.arg[11] = 0x00;
1407 
1408 	if (cx24120_message_send(state, &cmd)) {
1409 		err("Error set bandwidth!\n");
1410 		return -EREMOTEIO;
1411 	}
1412 
1413 	reg = cx24120_readreg(state, 0xba);
1414 	if (reg > 3) {
1415 		dev_dbg(&state->i2c->dev, "Reset-readreg 0xba: %x\n", ret);
1416 		err("Error initialising tuner!\n");
1417 		return -EREMOTEIO;
1418 	}
1419 
1420 	dev_dbg(&state->i2c->dev, "Tuner initialised correctly.\n");
1421 
1422 	/* Initialise mpeg outputs */
1423 	cx24120_writereg(state, 0xeb, 0x0a);
1424 	if (cx24120_msg_mpeg_output_global_config(state, 0) ||
1425 	    cx24120_msg_mpeg_output_config(state, 0) ||
1426 	    cx24120_msg_mpeg_output_config(state, 1) ||
1427 	    cx24120_msg_mpeg_output_config(state, 2)) {
1428 		err("Error initialising mpeg output. :(\n");
1429 		return -EREMOTEIO;
1430 	}
1431 
1432 	/* Set size of BER window */
1433 	cmd.id = CMD_BER_CTRL;
1434 	cmd.len = 3;
1435 	cmd.arg[0] = 0x00;
1436 	cmd.arg[1] = CX24120_BER_WINDOW;
1437 	cmd.arg[2] = CX24120_BER_WINDOW;
1438 	if (cx24120_message_send(state, &cmd)) {
1439 		err("Error setting ber window\n");
1440 		return -EREMOTEIO;
1441 	}
1442 
1443 	/* Firmware CMD 35: Get firmware version */
1444 	cmd.id = CMD_FWVERSION;
1445 	cmd.len = 1;
1446 	for (i = 0; i < 4; i++) {
1447 		cmd.arg[0] = i;
1448 		ret = cx24120_message_send(state, &cmd);
1449 		if (ret != 0)
1450 			return ret;
1451 		vers[i] = cx24120_readreg(state, CX24120_REG_MAILBOX);
1452 	}
1453 	info("FW version %i.%i.%i.%i\n", vers[0], vers[1], vers[2], vers[3]);
1454 
1455 	/* init stats here in order signal app which stats are supported */
1456 	c->strength.len = 1;
1457 	c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1458 	c->cnr.len = 1;
1459 	c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1460 	c->post_bit_error.len = 1;
1461 	c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1462 	c->post_bit_count.len = 1;
1463 	c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1464 	c->block_error.len = 1;
1465 	c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1466 	c->block_count.len = 1;
1467 	c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1468 
1469 	state->cold_init = 1;
1470 
1471 	return 0;
1472 }
1473 
1474 static int cx24120_tune(struct dvb_frontend *fe, bool re_tune,
1475 			unsigned int mode_flags, unsigned int *delay,
1476 			enum fe_status *status)
1477 {
1478 	struct cx24120_state *state = fe->demodulator_priv;
1479 	int ret;
1480 
1481 	dev_dbg(&state->i2c->dev, "(%d)\n", re_tune);
1482 
1483 	/* TODO: Do we need to set delay? */
1484 
1485 	if (re_tune) {
1486 		ret = cx24120_set_frontend(fe);
1487 		if (ret)
1488 			return ret;
1489 	}
1490 
1491 	return cx24120_read_status(fe, status);
1492 }
1493 
1494 static int cx24120_get_algo(struct dvb_frontend *fe)
1495 {
1496 	return DVBFE_ALGO_HW;
1497 }
1498 
1499 static int cx24120_sleep(struct dvb_frontend *fe)
1500 {
1501 	return 0;
1502 }
1503 
1504 static int cx24120_get_frontend(struct dvb_frontend *fe,
1505 				struct dtv_frontend_properties *c)
1506 {
1507 	struct cx24120_state *state = fe->demodulator_priv;
1508 	u8 freq1, freq2, freq3;
1509 	int status;
1510 
1511 	dev_dbg(&state->i2c->dev, "\n");
1512 
1513 	/* don't return empty data if we're not tuned in */
1514 	status = cx24120_readreg(state, CX24120_REG_STATUS);
1515 	if (!(status & CX24120_HAS_LOCK))
1516 		return 0;
1517 
1518 	/* Get frequency */
1519 	freq1 = cx24120_readreg(state, CX24120_REG_FREQ1);
1520 	freq2 = cx24120_readreg(state, CX24120_REG_FREQ2);
1521 	freq3 = cx24120_readreg(state, CX24120_REG_FREQ3);
1522 	c->frequency = (freq3 << 16) | (freq2 << 8) | freq1;
1523 	dev_dbg(&state->i2c->dev, "frequency = %d\n", c->frequency);
1524 
1525 	/* Get modulation, fec, pilot */
1526 	cx24120_get_fec(fe);
1527 
1528 	return 0;
1529 }
1530 
1531 static void cx24120_release(struct dvb_frontend *fe)
1532 {
1533 	struct cx24120_state *state = fe->demodulator_priv;
1534 
1535 	dev_dbg(&state->i2c->dev, "Clear state structure\n");
1536 	kfree(state);
1537 }
1538 
1539 static int cx24120_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
1540 {
1541 	struct cx24120_state *state = fe->demodulator_priv;
1542 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1543 
1544 	if (c->block_error.stat[0].scale != FE_SCALE_COUNTER) {
1545 		*ucblocks = 0;
1546 		return 0;
1547 	}
1548 
1549 	*ucblocks = c->block_error.stat[0].uvalue - state->ucb_offset;
1550 
1551 	return 0;
1552 }
1553 
1554 static const struct dvb_frontend_ops cx24120_ops = {
1555 	.delsys = { SYS_DVBS, SYS_DVBS2 },
1556 	.info = {
1557 		.name = "Conexant CX24120/CX24118",
1558 		.frequency_min = 950000,
1559 		.frequency_max = 2150000,
1560 		.frequency_stepsize = 1011, /* kHz for QPSK frontends */
1561 		.frequency_tolerance = 5000,
1562 		.symbol_rate_min = 1000000,
1563 		.symbol_rate_max = 45000000,
1564 		.caps =	FE_CAN_INVERSION_AUTO |
1565 			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
1566 			FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
1567 			FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
1568 			FE_CAN_2G_MODULATION |
1569 			FE_CAN_QPSK | FE_CAN_RECOVER
1570 	},
1571 	.release =			cx24120_release,
1572 
1573 	.init =				cx24120_init,
1574 	.sleep =			cx24120_sleep,
1575 
1576 	.tune =				cx24120_tune,
1577 	.get_frontend_algo =		cx24120_get_algo,
1578 	.set_frontend =			cx24120_set_frontend,
1579 
1580 	.get_frontend =			cx24120_get_frontend,
1581 	.read_status =			cx24120_read_status,
1582 	.read_ber =			cx24120_read_ber,
1583 	.read_signal_strength =		cx24120_read_signal_strength,
1584 	.read_snr =			cx24120_read_snr,
1585 	.read_ucblocks =		cx24120_read_ucblocks,
1586 
1587 	.diseqc_send_master_cmd =	cx24120_send_diseqc_msg,
1588 
1589 	.diseqc_send_burst =		cx24120_diseqc_send_burst,
1590 	.set_tone =			cx24120_set_tone,
1591 	.set_voltage =			cx24120_set_voltage,
1592 };
1593 
1594 MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24120/CX24118 hardware");
1595 MODULE_AUTHOR("Jemma Denson");
1596 MODULE_LICENSE("GPL");
1597