1 /*
2     Driver for ST STV0299 demodulator
3 
4     Copyright (C) 2001-2002 Convergence Integrated Media GmbH
5 	<ralph@convergence.de>,
6 	<holger@convergence.de>,
7 	<js@convergence.de>
8 
9 
10     Philips SU1278/SH
11 
12     Copyright (C) 2002 by Peter Schildmann <peter.schildmann@web.de>
13 
14 
15     LG TDQF-S001F
16 
17     Copyright (C) 2002 Felix Domke <tmbinc@elitedvb.net>
18 		     & Andreas Oberritter <obi@linuxtv.org>
19 
20 
21     Support for Samsung TBMU24112IMB used on Technisat SkyStar2 rev. 2.6B
22 
23     Copyright (C) 2003 Vadim Catana <skystar@moldova.cc>:
24 
25     Support for Philips SU1278 on Technotrend hardware
26 
27     Copyright (C) 2004 Andrew de Quincey <adq_dvb@lidskialf.net>
28 
29     This program is free software; you can redistribute it and/or modify
30     it under the terms of the GNU General Public License as published by
31     the Free Software Foundation; either version 2 of the License, or
32     (at your option) any later version.
33 
34     This program is distributed in the hope that it will be useful,
35     but WITHOUT ANY WARRANTY; without even the implied warranty of
36     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
37     GNU General Public License for more details.
38 
39     You should have received a copy of the GNU General Public License
40     along with this program; if not, write to the Free Software
41     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
42 
43 */
44 
45 #include <linux/init.h>
46 #include <linux/kernel.h>
47 #include <linux/ktime.h>
48 #include <linux/module.h>
49 #include <linux/string.h>
50 #include <linux/slab.h>
51 #include <linux/jiffies.h>
52 #include <asm/div64.h>
53 
54 #include <media/dvb_frontend.h>
55 #include "stv0299.h"
56 
57 struct stv0299_state {
58 	struct i2c_adapter* i2c;
59 	const struct stv0299_config* config;
60 	struct dvb_frontend frontend;
61 
62 	u8 initialised:1;
63 	u32 tuner_frequency;
64 	u32 symbol_rate;
65 	enum fe_code_rate fec_inner;
66 	int errmode;
67 	u32 ucblocks;
68 	u8 mcr_reg;
69 };
70 
71 #define STATUS_BER 0
72 #define STATUS_UCBLOCKS 1
73 
74 static int debug;
75 static int debug_legacy_dish_switch;
76 #define dprintk(args...) \
77 	do { \
78 		if (debug) printk(KERN_DEBUG "stv0299: " args); \
79 	} while (0)
80 
81 
82 static int stv0299_writeregI (struct stv0299_state* state, u8 reg, u8 data)
83 {
84 	int ret;
85 	u8 buf [] = { reg, data };
86 	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
87 
88 	ret = i2c_transfer (state->i2c, &msg, 1);
89 
90 	if (ret != 1)
91 		dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
92 			__func__, reg, data, ret);
93 
94 	return (ret != 1) ? -EREMOTEIO : 0;
95 }
96 
97 static int stv0299_write(struct dvb_frontend* fe, const u8 buf[], int len)
98 {
99 	struct stv0299_state* state = fe->demodulator_priv;
100 
101 	if (len != 2)
102 		return -EINVAL;
103 
104 	return stv0299_writeregI(state, buf[0], buf[1]);
105 }
106 
107 static u8 stv0299_readreg (struct stv0299_state* state, u8 reg)
108 {
109 	int ret;
110 	u8 b0 [] = { reg };
111 	u8 b1 [] = { 0 };
112 	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
113 			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
114 
115 	ret = i2c_transfer (state->i2c, msg, 2);
116 
117 	if (ret != 2)
118 		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
119 				__func__, reg, ret);
120 
121 	return b1[0];
122 }
123 
124 static int stv0299_readregs (struct stv0299_state* state, u8 reg1, u8 *b, u8 len)
125 {
126 	int ret;
127 	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
128 			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };
129 
130 	ret = i2c_transfer (state->i2c, msg, 2);
131 
132 	if (ret != 2)
133 		dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
134 
135 	return ret == 2 ? 0 : ret;
136 }
137 
138 static int stv0299_set_FEC(struct stv0299_state *state, enum fe_code_rate fec)
139 {
140 	dprintk ("%s\n", __func__);
141 
142 	switch (fec) {
143 	case FEC_AUTO:
144 	{
145 		return stv0299_writeregI (state, 0x31, 0x1f);
146 	}
147 	case FEC_1_2:
148 	{
149 		return stv0299_writeregI (state, 0x31, 0x01);
150 	}
151 	case FEC_2_3:
152 	{
153 		return stv0299_writeregI (state, 0x31, 0x02);
154 	}
155 	case FEC_3_4:
156 	{
157 		return stv0299_writeregI (state, 0x31, 0x04);
158 	}
159 	case FEC_5_6:
160 	{
161 		return stv0299_writeregI (state, 0x31, 0x08);
162 	}
163 	case FEC_7_8:
164 	{
165 		return stv0299_writeregI (state, 0x31, 0x10);
166 	}
167 	default:
168 	{
169 		return -EINVAL;
170 	}
171     }
172 }
173 
174 static enum fe_code_rate stv0299_get_fec(struct stv0299_state *state)
175 {
176 	static enum fe_code_rate fec_tab[] = { FEC_2_3, FEC_3_4, FEC_5_6,
177 					       FEC_7_8, FEC_1_2 };
178 	u8 index;
179 
180 	dprintk ("%s\n", __func__);
181 
182 	index = stv0299_readreg (state, 0x1b);
183 	index &= 0x7;
184 
185 	if (index > 4)
186 		return FEC_AUTO;
187 
188 	return fec_tab [index];
189 }
190 
191 static int stv0299_wait_diseqc_fifo (struct stv0299_state* state, int timeout)
192 {
193 	unsigned long start = jiffies;
194 
195 	dprintk ("%s\n", __func__);
196 
197 	while (stv0299_readreg(state, 0x0a) & 1) {
198 		if (jiffies - start > timeout) {
199 			dprintk ("%s: timeout!!\n", __func__);
200 			return -ETIMEDOUT;
201 		}
202 		msleep(10);
203 	}
204 
205 	return 0;
206 }
207 
208 static int stv0299_wait_diseqc_idle (struct stv0299_state* state, int timeout)
209 {
210 	unsigned long start = jiffies;
211 
212 	dprintk ("%s\n", __func__);
213 
214 	while ((stv0299_readreg(state, 0x0a) & 3) != 2 ) {
215 		if (jiffies - start > timeout) {
216 			dprintk ("%s: timeout!!\n", __func__);
217 			return -ETIMEDOUT;
218 		}
219 		msleep(10);
220 	}
221 
222 	return 0;
223 }
224 
225 static int stv0299_set_symbolrate (struct dvb_frontend* fe, u32 srate)
226 {
227 	struct stv0299_state* state = fe->demodulator_priv;
228 	u64 big = srate;
229 	u32 ratio;
230 
231 	// check rate is within limits
232 	if ((srate < 1000000) || (srate > 45000000)) return -EINVAL;
233 
234 	// calculate value to program
235 	big = big << 20;
236 	big += (state->config->mclk-1); // round correctly
237 	do_div(big, state->config->mclk);
238 	ratio = big << 4;
239 
240 	return state->config->set_symbol_rate(fe, srate, ratio);
241 }
242 
243 static int stv0299_get_symbolrate (struct stv0299_state* state)
244 {
245 	u32 Mclk = state->config->mclk / 4096L;
246 	u32 srate;
247 	s32 offset;
248 	u8 sfr[3];
249 	s8 rtf;
250 
251 	dprintk ("%s\n", __func__);
252 
253 	stv0299_readregs (state, 0x1f, sfr, 3);
254 	stv0299_readregs (state, 0x1a, (u8 *)&rtf, 1);
255 
256 	srate = (sfr[0] << 8) | sfr[1];
257 	srate *= Mclk;
258 	srate /= 16;
259 	srate += (sfr[2] >> 4) * Mclk / 256;
260 	offset = (s32) rtf * (srate / 4096L);
261 	offset /= 128;
262 
263 	dprintk ("%s : srate = %i\n", __func__, srate);
264 	dprintk ("%s : ofset = %i\n", __func__, offset);
265 
266 	srate += offset;
267 
268 	srate += 1000;
269 	srate /= 2000;
270 	srate *= 2000;
271 
272 	return srate;
273 }
274 
275 static int stv0299_send_diseqc_msg (struct dvb_frontend* fe,
276 				    struct dvb_diseqc_master_cmd *m)
277 {
278 	struct stv0299_state* state = fe->demodulator_priv;
279 	u8 val;
280 	int i;
281 
282 	dprintk ("%s\n", __func__);
283 
284 	if (stv0299_wait_diseqc_idle (state, 100) < 0)
285 		return -ETIMEDOUT;
286 
287 	val = stv0299_readreg (state, 0x08);
288 
289 	if (stv0299_writeregI (state, 0x08, (val & ~0x7) | 0x6))  /* DiSEqC mode */
290 		return -EREMOTEIO;
291 
292 	for (i=0; i<m->msg_len; i++) {
293 		if (stv0299_wait_diseqc_fifo (state, 100) < 0)
294 			return -ETIMEDOUT;
295 
296 		if (stv0299_writeregI (state, 0x09, m->msg[i]))
297 			return -EREMOTEIO;
298 	}
299 
300 	if (stv0299_wait_diseqc_idle (state, 100) < 0)
301 		return -ETIMEDOUT;
302 
303 	return 0;
304 }
305 
306 static int stv0299_send_diseqc_burst(struct dvb_frontend *fe,
307 				     enum fe_sec_mini_cmd burst)
308 {
309 	struct stv0299_state* state = fe->demodulator_priv;
310 	u8 val;
311 
312 	dprintk ("%s\n", __func__);
313 
314 	if (stv0299_wait_diseqc_idle (state, 100) < 0)
315 		return -ETIMEDOUT;
316 
317 	val = stv0299_readreg (state, 0x08);
318 
319 	if (stv0299_writeregI (state, 0x08, (val & ~0x7) | 0x2))	/* burst mode */
320 		return -EREMOTEIO;
321 
322 	if (stv0299_writeregI (state, 0x09, burst == SEC_MINI_A ? 0x00 : 0xff))
323 		return -EREMOTEIO;
324 
325 	if (stv0299_wait_diseqc_idle (state, 100) < 0)
326 		return -ETIMEDOUT;
327 
328 	if (stv0299_writeregI (state, 0x08, val))
329 		return -EREMOTEIO;
330 
331 	return 0;
332 }
333 
334 static int stv0299_set_tone(struct dvb_frontend *fe,
335 			    enum fe_sec_tone_mode tone)
336 {
337 	struct stv0299_state* state = fe->demodulator_priv;
338 	u8 val;
339 
340 	if (stv0299_wait_diseqc_idle (state, 100) < 0)
341 		return -ETIMEDOUT;
342 
343 	val = stv0299_readreg (state, 0x08);
344 
345 	switch (tone) {
346 	case SEC_TONE_ON:
347 		return stv0299_writeregI (state, 0x08, val | 0x3);
348 
349 	case SEC_TONE_OFF:
350 		return stv0299_writeregI (state, 0x08, (val & ~0x3) | 0x02);
351 
352 	default:
353 		return -EINVAL;
354 	}
355 }
356 
357 static int stv0299_set_voltage(struct dvb_frontend *fe,
358 			       enum fe_sec_voltage voltage)
359 {
360 	struct stv0299_state* state = fe->demodulator_priv;
361 	u8 reg0x08;
362 	u8 reg0x0c;
363 
364 	dprintk("%s: %s\n", __func__,
365 		voltage == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
366 		voltage == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" : "??");
367 
368 	reg0x08 = stv0299_readreg (state, 0x08);
369 	reg0x0c = stv0299_readreg (state, 0x0c);
370 
371 	/*
372 	 *  H/V switching over OP0, OP1 and OP2 are LNB power enable bits
373 	 */
374 	reg0x0c &= 0x0f;
375 	reg0x08 = (reg0x08 & 0x3f) | (state->config->lock_output << 6);
376 
377 	switch (voltage) {
378 	case SEC_VOLTAGE_13:
379 		if (state->config->volt13_op0_op1 == STV0299_VOLT13_OP0)
380 			reg0x0c |= 0x10; /* OP1 off, OP0 on */
381 		else
382 			reg0x0c |= 0x40; /* OP1 on, OP0 off */
383 		break;
384 	case SEC_VOLTAGE_18:
385 		reg0x0c |= 0x50; /* OP1 on, OP0 on */
386 		break;
387 	case SEC_VOLTAGE_OFF:
388 		/* LNB power off! */
389 		reg0x08 = 0x00;
390 		reg0x0c = 0x00;
391 		break;
392 	default:
393 		return -EINVAL;
394 	}
395 
396 	if (state->config->op0_off)
397 		reg0x0c &= ~0x10;
398 
399 	stv0299_writeregI(state, 0x08, reg0x08);
400 	return stv0299_writeregI(state, 0x0c, reg0x0c);
401 }
402 
403 static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long cmd)
404 {
405 	struct stv0299_state* state = fe->demodulator_priv;
406 	u8 reg0x08;
407 	u8 reg0x0c;
408 	u8 lv_mask = 0x40;
409 	u8 last = 1;
410 	int i;
411 	ktime_t nexttime;
412 	ktime_t tv[10];
413 
414 	reg0x08 = stv0299_readreg (state, 0x08);
415 	reg0x0c = stv0299_readreg (state, 0x0c);
416 	reg0x0c &= 0x0f;
417 	stv0299_writeregI (state, 0x08, (reg0x08 & 0x3f) | (state->config->lock_output << 6));
418 	if (state->config->volt13_op0_op1 == STV0299_VOLT13_OP0)
419 		lv_mask = 0x10;
420 
421 	cmd = cmd << 1;
422 	if (debug_legacy_dish_switch)
423 		printk ("%s switch command: 0x%04lx\n",__func__, cmd);
424 
425 	nexttime = ktime_get_boottime();
426 	if (debug_legacy_dish_switch)
427 		tv[0] = nexttime;
428 	stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
429 
430 	dvb_frontend_sleep_until(&nexttime, 32000);
431 
432 	for (i=0; i<9; i++) {
433 		if (debug_legacy_dish_switch)
434 			tv[i+1] = ktime_get_boottime();
435 		if((cmd & 0x01) != last) {
436 			/* set voltage to (last ? 13V : 18V) */
437 			stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50));
438 			last = (last) ? 0 : 1;
439 		}
440 
441 		cmd = cmd >> 1;
442 
443 		if (i != 8)
444 			dvb_frontend_sleep_until(&nexttime, 8000);
445 	}
446 	if (debug_legacy_dish_switch) {
447 		printk ("%s(%d): switch delay (should be 32k followed by all 8k\n",
448 			__func__, fe->dvb->num);
449 		for (i = 1; i < 10; i++)
450 			printk("%d: %d\n", i,
451 			       (int) ktime_us_delta(tv[i], tv[i-1]));
452 	}
453 
454 	return 0;
455 }
456 
457 static int stv0299_init (struct dvb_frontend* fe)
458 {
459 	struct stv0299_state* state = fe->demodulator_priv;
460 	int i;
461 	u8 reg;
462 	u8 val;
463 
464 	dprintk("stv0299: init chip\n");
465 
466 	stv0299_writeregI(state, 0x02, 0x30 | state->mcr_reg);
467 	msleep(50);
468 
469 	for (i = 0; ; i += 2)  {
470 		reg = state->config->inittab[i];
471 		val = state->config->inittab[i+1];
472 		if (reg == 0xff && val == 0xff)
473 			break;
474 		if (reg == 0x0c && state->config->op0_off)
475 			val &= ~0x10;
476 		if (reg == 0x2)
477 			state->mcr_reg = val & 0xf;
478 		stv0299_writeregI(state, reg, val);
479 	}
480 
481 	return 0;
482 }
483 
484 static int stv0299_read_status(struct dvb_frontend *fe,
485 			       enum fe_status *status)
486 {
487 	struct stv0299_state* state = fe->demodulator_priv;
488 
489 	u8 signal = 0xff - stv0299_readreg (state, 0x18);
490 	u8 sync = stv0299_readreg (state, 0x1b);
491 
492 	dprintk ("%s : FE_READ_STATUS : VSTATUS: 0x%02x\n", __func__, sync);
493 	*status = 0;
494 
495 	if (signal > 10)
496 		*status |= FE_HAS_SIGNAL;
497 
498 	if (sync & 0x80)
499 		*status |= FE_HAS_CARRIER;
500 
501 	if (sync & 0x10)
502 		*status |= FE_HAS_VITERBI;
503 
504 	if (sync & 0x08)
505 		*status |= FE_HAS_SYNC;
506 
507 	if ((sync & 0x98) == 0x98)
508 		*status |= FE_HAS_LOCK;
509 
510 	return 0;
511 }
512 
513 static int stv0299_read_ber(struct dvb_frontend* fe, u32* ber)
514 {
515 	struct stv0299_state* state = fe->demodulator_priv;
516 
517 	if (state->errmode != STATUS_BER)
518 		return -ENOSYS;
519 
520 	*ber = stv0299_readreg(state, 0x1e) | (stv0299_readreg(state, 0x1d) << 8);
521 
522 	return 0;
523 }
524 
525 static int stv0299_read_signal_strength(struct dvb_frontend* fe, u16* strength)
526 {
527 	struct stv0299_state* state = fe->demodulator_priv;
528 
529 	s32 signal =  0xffff - ((stv0299_readreg (state, 0x18) << 8)
530 			       | stv0299_readreg (state, 0x19));
531 
532 	dprintk ("%s : FE_READ_SIGNAL_STRENGTH : AGC2I: 0x%02x%02x, signal=0x%04x\n", __func__,
533 		 stv0299_readreg (state, 0x18),
534 		 stv0299_readreg (state, 0x19), (int) signal);
535 
536 	signal = signal * 5 / 4;
537 	*strength = (signal > 0xffff) ? 0xffff : (signal < 0) ? 0 : signal;
538 
539 	return 0;
540 }
541 
542 static int stv0299_read_snr(struct dvb_frontend* fe, u16* snr)
543 {
544 	struct stv0299_state* state = fe->demodulator_priv;
545 
546 	s32 xsnr = 0xffff - ((stv0299_readreg (state, 0x24) << 8)
547 			   | stv0299_readreg (state, 0x25));
548 	xsnr = 3 * (xsnr - 0xa100);
549 	*snr = (xsnr > 0xffff) ? 0xffff : (xsnr < 0) ? 0 : xsnr;
550 
551 	return 0;
552 }
553 
554 static int stv0299_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
555 {
556 	struct stv0299_state* state = fe->demodulator_priv;
557 
558 	if (state->errmode != STATUS_UCBLOCKS)
559 		return -ENOSYS;
560 
561 	state->ucblocks += stv0299_readreg(state, 0x1e);
562 	state->ucblocks += (stv0299_readreg(state, 0x1d) << 8);
563 	*ucblocks = state->ucblocks;
564 
565 	return 0;
566 }
567 
568 static int stv0299_set_frontend(struct dvb_frontend *fe)
569 {
570 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
571 	struct stv0299_state* state = fe->demodulator_priv;
572 	int invval = 0;
573 
574 	dprintk ("%s : FE_SET_FRONTEND\n", __func__);
575 	if (state->config->set_ts_params)
576 		state->config->set_ts_params(fe, 0);
577 
578 	// set the inversion
579 	if (p->inversion == INVERSION_OFF) invval = 0;
580 	else if (p->inversion == INVERSION_ON) invval = 1;
581 	else {
582 		printk("stv0299 does not support auto-inversion\n");
583 		return -EINVAL;
584 	}
585 	if (state->config->invert) invval = (~invval) & 1;
586 	stv0299_writeregI(state, 0x0c, (stv0299_readreg(state, 0x0c) & 0xfe) | invval);
587 
588 	if (fe->ops.tuner_ops.set_params) {
589 		fe->ops.tuner_ops.set_params(fe);
590 		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
591 	}
592 
593 	stv0299_set_FEC(state, p->fec_inner);
594 	stv0299_set_symbolrate(fe, p->symbol_rate);
595 	stv0299_writeregI(state, 0x22, 0x00);
596 	stv0299_writeregI(state, 0x23, 0x00);
597 
598 	state->tuner_frequency = p->frequency;
599 	state->fec_inner = p->fec_inner;
600 	state->symbol_rate = p->symbol_rate;
601 
602 	return 0;
603 }
604 
605 static int stv0299_get_frontend(struct dvb_frontend *fe,
606 				struct dtv_frontend_properties *p)
607 {
608 	struct stv0299_state* state = fe->demodulator_priv;
609 	s32 derot_freq;
610 	int invval;
611 
612 	derot_freq = (s32)(s16) ((stv0299_readreg (state, 0x22) << 8)
613 				| stv0299_readreg (state, 0x23));
614 
615 	derot_freq *= (state->config->mclk >> 16);
616 	derot_freq += 500;
617 	derot_freq /= 1000;
618 
619 	p->frequency += derot_freq;
620 
621 	invval = stv0299_readreg (state, 0x0c) & 1;
622 	if (state->config->invert) invval = (~invval) & 1;
623 	p->inversion = invval ? INVERSION_ON : INVERSION_OFF;
624 
625 	p->fec_inner = stv0299_get_fec(state);
626 	p->symbol_rate = stv0299_get_symbolrate(state);
627 
628 	return 0;
629 }
630 
631 static int stv0299_sleep(struct dvb_frontend* fe)
632 {
633 	struct stv0299_state* state = fe->demodulator_priv;
634 
635 	stv0299_writeregI(state, 0x02, 0xb0 | state->mcr_reg);
636 	state->initialised = 0;
637 
638 	return 0;
639 }
640 
641 static int stv0299_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
642 {
643 	struct stv0299_state* state = fe->demodulator_priv;
644 
645 	if (enable) {
646 		stv0299_writeregI(state, 0x05, 0xb5);
647 	} else {
648 		stv0299_writeregI(state, 0x05, 0x35);
649 	}
650 	udelay(1);
651 	return 0;
652 }
653 
654 static int stv0299_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
655 {
656 	struct stv0299_state* state = fe->demodulator_priv;
657 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
658 
659 	fesettings->min_delay_ms = state->config->min_delay_ms;
660 	if (p->symbol_rate < 10000000) {
661 		fesettings->step_size = p->symbol_rate / 32000;
662 		fesettings->max_drift = 5000;
663 	} else {
664 		fesettings->step_size = p->symbol_rate / 16000;
665 		fesettings->max_drift = p->symbol_rate / 2000;
666 	}
667 	return 0;
668 }
669 
670 static void stv0299_release(struct dvb_frontend* fe)
671 {
672 	struct stv0299_state* state = fe->demodulator_priv;
673 	kfree(state);
674 }
675 
676 static const struct dvb_frontend_ops stv0299_ops;
677 
678 struct dvb_frontend* stv0299_attach(const struct stv0299_config* config,
679 				    struct i2c_adapter* i2c)
680 {
681 	struct stv0299_state* state = NULL;
682 	int id;
683 
684 	/* allocate memory for the internal state */
685 	state = kzalloc(sizeof(struct stv0299_state), GFP_KERNEL);
686 	if (state == NULL) goto error;
687 
688 	/* setup the state */
689 	state->config = config;
690 	state->i2c = i2c;
691 	state->initialised = 0;
692 	state->tuner_frequency = 0;
693 	state->symbol_rate = 0;
694 	state->fec_inner = 0;
695 	state->errmode = STATUS_BER;
696 
697 	/* check if the demod is there */
698 	stv0299_writeregI(state, 0x02, 0x30); /* standby off */
699 	msleep(200);
700 	id = stv0299_readreg(state, 0x00);
701 
702 	/* register 0x00 contains 0xa1 for STV0299 and STV0299B */
703 	/* register 0x00 might contain 0x80 when returning from standby */
704 	if (id != 0xa1 && id != 0x80) goto error;
705 
706 	/* create dvb_frontend */
707 	memcpy(&state->frontend.ops, &stv0299_ops, sizeof(struct dvb_frontend_ops));
708 	state->frontend.demodulator_priv = state;
709 	return &state->frontend;
710 
711 error:
712 	kfree(state);
713 	return NULL;
714 }
715 
716 static const struct dvb_frontend_ops stv0299_ops = {
717 	.delsys = { SYS_DVBS },
718 	.info = {
719 		.name			= "ST STV0299 DVB-S",
720 		.frequency_min_hz	=  950 * MHz,
721 		.frequency_max_hz	= 2150 * MHz,
722 		.frequency_stepsize_hz	=  125 * kHz,
723 		.symbol_rate_min	= 1000000,
724 		.symbol_rate_max	= 45000000,
725 		.symbol_rate_tolerance	= 500,	/* ppm */
726 		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
727 		      FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
728 		      FE_CAN_QPSK |
729 		      FE_CAN_FEC_AUTO
730 	},
731 
732 	.release = stv0299_release,
733 
734 	.init = stv0299_init,
735 	.sleep = stv0299_sleep,
736 	.write = stv0299_write,
737 	.i2c_gate_ctrl = stv0299_i2c_gate_ctrl,
738 
739 	.set_frontend = stv0299_set_frontend,
740 	.get_frontend = stv0299_get_frontend,
741 	.get_tune_settings = stv0299_get_tune_settings,
742 
743 	.read_status = stv0299_read_status,
744 	.read_ber = stv0299_read_ber,
745 	.read_signal_strength = stv0299_read_signal_strength,
746 	.read_snr = stv0299_read_snr,
747 	.read_ucblocks = stv0299_read_ucblocks,
748 
749 	.diseqc_send_master_cmd = stv0299_send_diseqc_msg,
750 	.diseqc_send_burst = stv0299_send_diseqc_burst,
751 	.set_tone = stv0299_set_tone,
752 	.set_voltage = stv0299_set_voltage,
753 	.dishnetwork_send_legacy_command = stv0299_send_legacy_dish_cmd,
754 };
755 
756 module_param(debug_legacy_dish_switch, int, 0444);
757 MODULE_PARM_DESC(debug_legacy_dish_switch, "Enable timing analysis for Dish Network legacy switches");
758 
759 module_param(debug, int, 0644);
760 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
761 
762 MODULE_DESCRIPTION("ST STV0299 DVB Demodulator driver");
763 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Peter Schildmann, Felix Domke, Andreas Oberritter, Andrew de Quincey, Kenneth Aafly");
764 MODULE_LICENSE("GPL");
765 
766 EXPORT_SYMBOL(stv0299_attach);
767