2 Conexant cx24123/cx24109 - DVB QPSK Satellite demod/tuner driver
4 Copyright (C) 2005 Steven Toth <stoth@hauppauge.com>
6 Support for KWorld DVB-S 100 by Vadim Catana <skystar@moldova.cc>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/slab.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/init.h>
29 #include "dvb_frontend.h"
34 static int force_band;
36 #define dprintk(args...) \
38 if (debug) printk (KERN_DEBUG "cx24123: " args); \
43 struct i2c_adapter* i2c;
44 const struct cx24123_config* config;
46 struct dvb_frontend frontend;
48 /* Some PLL specifics for tuning */
55 /* The Demod/Tuner can't easily provide these, we cache them */
57 u32 currentsymbolrate;
60 /* Various tuner defaults need to be established for a given symbol rate Sps */
68 } cx24123_AGC_vals[] =
71 .symbolrate_low = 1000000,
72 .symbolrate_high = 4999999,
73 /* the specs recommend other values for VGA offsets,
74 but tests show they are wrong */
75 .VGAprogdata = (1 << 19) | (0x180 << 9) | 0x1e0,
76 .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x07,
77 .FILTune = 0x27f /* 0.41 V */
80 .symbolrate_low = 5000000,
81 .symbolrate_high = 14999999,
82 .VGAprogdata = (1 << 19) | (0x180 << 9) | 0x1e0,
83 .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x1f,
84 .FILTune = 0x317 /* 0.90 V */
87 .symbolrate_low = 15000000,
88 .symbolrate_high = 45000000,
89 .VGAprogdata = (1 << 19) | (0x100 << 9) | 0x180,
90 .VCAprogdata = (2 << 19) | (0x07 << 9) | 0x3f,
91 .FILTune = 0x145 /* 2.70 V */
96 * Various tuner defaults need to be established for a given frequency kHz.
97 * fixme: The bounds on the bands do not match the doc in real life.
98 * fixme: Some of them have been moved, other might need adjustment.
106 } cx24123_bandselect_vals[] =
111 .freq_high = 1074999,
113 .progdata = (0 << 19) | (0 << 9) | 0x40,
119 .freq_high = 1177999,
121 .progdata = (0 << 19) | (0 << 9) | 0x80,
127 .freq_high = 1295999,
129 .progdata = (0 << 19) | (1 << 9) | 0x01,
135 .freq_high = 1431999,
137 .progdata = (0 << 19) | (1 << 9) | 0x02,
143 .freq_high = 1575999,
145 .progdata = (0 << 19) | (1 << 9) | 0x04,
151 .freq_high = 1717999,
153 .progdata = (0 << 19) | (1 << 9) | 0x08,
159 .freq_high = 1855999,
161 .progdata = (0 << 19) | (1 << 9) | 0x10,
167 .freq_high = 2035999,
169 .progdata = (0 << 19) | (1 << 9) | 0x20,
175 .freq_high = 2150000,
177 .progdata = (0 << 19) | (1 << 9) | 0x40,
184 } cx24123_regdata[] =
186 {0x00, 0x03}, /* Reset system */
187 {0x00, 0x00}, /* Clear reset */
188 {0x03, 0x07}, /* QPSK, DVB, Auto Acquisition (default) */
189 {0x04, 0x10}, /* MPEG */
190 {0x05, 0x04}, /* MPEG */
191 {0x06, 0x31}, /* MPEG (default) */
192 {0x0b, 0x00}, /* Freq search start point (default) */
193 {0x0c, 0x00}, /* Demodulator sample gain (default) */
194 {0x0d, 0x7f}, /* Force driver to shift until the maximum (+-10 MHz) */
195 {0x0e, 0x03}, /* Default non-inverted, FEC 3/4 (default) */
196 {0x0f, 0xfe}, /* FEC search mask (all supported codes) */
197 {0x10, 0x01}, /* Default search inversion, no repeat (default) */
198 {0x16, 0x00}, /* Enable reading of frequency */
199 {0x17, 0x01}, /* Enable EsNO Ready Counter */
200 {0x1c, 0x80}, /* Enable error counter */
201 {0x20, 0x00}, /* Tuner burst clock rate = 500KHz */
202 {0x21, 0x15}, /* Tuner burst mode, word length = 0x15 */
203 {0x28, 0x00}, /* Enable FILTERV with positive pol., DiSEqC 2.x off */
204 {0x29, 0x00}, /* DiSEqC LNB_DC off */
205 {0x2a, 0xb0}, /* DiSEqC Parameters (default) */
206 {0x2b, 0x73}, /* DiSEqC Tone Frequency (default) */
207 {0x2c, 0x00}, /* DiSEqC Message (0x2c - 0x31) */
213 {0x32, 0x8c}, /* DiSEqC Parameters (default) */
214 {0x33, 0x00}, /* Interrupts off (0x33 - 0x34) */
216 {0x35, 0x03}, /* DiSEqC Tone Amplitude (default) */
217 {0x36, 0x02}, /* DiSEqC Parameters (default) */
218 {0x37, 0x3a}, /* DiSEqC Parameters (default) */
219 {0x3a, 0x00}, /* Enable AGC accumulator (for signal strength) */
220 {0x44, 0x00}, /* Constellation (default) */
221 {0x45, 0x00}, /* Symbol count (default) */
222 {0x46, 0x0d}, /* Symbol rate estimator on (default) */
223 {0x56, 0xc1}, /* Error Counter = Viterbi BER */
224 {0x57, 0xff}, /* Error Counter Window (default) */
225 {0x5c, 0x20}, /* Acquisition AFC Expiration window (default is 0x10) */
226 {0x67, 0x83}, /* Non-DCII symbol clock */
229 static int cx24123_writereg(struct cx24123_state* state, int reg, int data)
231 u8 buf[] = { reg, data };
232 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
236 printk("cx24123: %s: write reg 0x%02x, value 0x%02x\n",
237 __FUNCTION__,reg, data);
239 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
240 printk("%s: writereg error(err == %i, reg == 0x%02x,"
241 " data == 0x%02x)\n", __FUNCTION__, err, reg, data);
248 static int cx24123_readreg(struct cx24123_state* state, u8 reg)
253 struct i2c_msg msg[] = {
254 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
255 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 }
258 ret = i2c_transfer(state->i2c, msg, 2);
261 printk("%s: reg=0x%x (error=%d)\n", __FUNCTION__, reg, ret);
266 printk("cx24123: read reg 0x%02x, value 0x%02x\n",reg, ret);
271 static int cx24123_set_inversion(struct cx24123_state* state, fe_spectral_inversion_t inversion)
273 u8 nom_reg = cx24123_readreg(state, 0x0e);
274 u8 auto_reg = cx24123_readreg(state, 0x10);
278 dprintk("%s: inversion off\n",__FUNCTION__);
279 cx24123_writereg(state, 0x0e, nom_reg & ~0x80);
280 cx24123_writereg(state, 0x10, auto_reg | 0x80);
283 dprintk("%s: inversion on\n",__FUNCTION__);
284 cx24123_writereg(state, 0x0e, nom_reg | 0x80);
285 cx24123_writereg(state, 0x10, auto_reg | 0x80);
288 dprintk("%s: inversion auto\n",__FUNCTION__);
289 cx24123_writereg(state, 0x10, auto_reg & ~0x80);
298 static int cx24123_get_inversion(struct cx24123_state* state, fe_spectral_inversion_t *inversion)
302 val = cx24123_readreg(state, 0x1b) >> 7;
305 dprintk("%s: read inversion off\n",__FUNCTION__);
306 *inversion = INVERSION_OFF;
308 dprintk("%s: read inversion on\n",__FUNCTION__);
309 *inversion = INVERSION_ON;
315 static int cx24123_set_fec(struct cx24123_state* state, fe_code_rate_t fec)
317 u8 nom_reg = cx24123_readreg(state, 0x0e) & ~0x07;
319 if ( (fec < FEC_NONE) || (fec > FEC_AUTO) )
322 /* Set the soft decision threshold */
324 cx24123_writereg(state, 0x43, cx24123_readreg(state, 0x43) | 0x01);
326 cx24123_writereg(state, 0x43, cx24123_readreg(state, 0x43) & ~0x01);
330 dprintk("%s: set FEC to 1/2\n",__FUNCTION__);
331 cx24123_writereg(state, 0x0e, nom_reg | 0x01);
332 cx24123_writereg(state, 0x0f, 0x02);
335 dprintk("%s: set FEC to 2/3\n",__FUNCTION__);
336 cx24123_writereg(state, 0x0e, nom_reg | 0x02);
337 cx24123_writereg(state, 0x0f, 0x04);
340 dprintk("%s: set FEC to 3/4\n",__FUNCTION__);
341 cx24123_writereg(state, 0x0e, nom_reg | 0x03);
342 cx24123_writereg(state, 0x0f, 0x08);
345 dprintk("%s: set FEC to 4/5\n",__FUNCTION__);
346 cx24123_writereg(state, 0x0e, nom_reg | 0x04);
347 cx24123_writereg(state, 0x0f, 0x10);
350 dprintk("%s: set FEC to 5/6\n",__FUNCTION__);
351 cx24123_writereg(state, 0x0e, nom_reg | 0x05);
352 cx24123_writereg(state, 0x0f, 0x20);
355 dprintk("%s: set FEC to 6/7\n",__FUNCTION__);
356 cx24123_writereg(state, 0x0e, nom_reg | 0x06);
357 cx24123_writereg(state, 0x0f, 0x40);
360 dprintk("%s: set FEC to 7/8\n",__FUNCTION__);
361 cx24123_writereg(state, 0x0e, nom_reg | 0x07);
362 cx24123_writereg(state, 0x0f, 0x80);
365 dprintk("%s: set FEC to auto\n",__FUNCTION__);
366 cx24123_writereg(state, 0x0f, 0xfe);
375 static int cx24123_get_fec(struct cx24123_state* state, fe_code_rate_t *fec)
379 ret = cx24123_readreg (state, 0x1b);
407 /* this can happen when there's no lock */
414 /* Approximation of closest integer of log2(a/b). It actually gives the
415 lowest integer i such that 2^i >= round(a/b) */
416 static u32 cx24123_int_log2(u32 a, u32 b)
418 u32 exp, nearest = 0;
420 if(a % b >= b / 2) ++div;
423 for(exp = 1; div > exp; nearest++)
429 static int cx24123_set_symbolrate(struct cx24123_state* state, u32 srate)
431 u32 tmp, sample_rate, ratio, sample_gain;
434 /* check if symbol rate is within limits */
435 if ((srate > state->frontend.ops.info.symbol_rate_max) ||
436 (srate < state->frontend.ops.info.symbol_rate_min))
439 /* choose the sampling rate high enough for the required operation,
440 while optimizing the power consumed by the demodulator */
441 if (srate < (XTAL*2)/2)
443 else if (srate < (XTAL*3)/2)
445 else if (srate < (XTAL*4)/2)
447 else if (srate < (XTAL*5)/2)
449 else if (srate < (XTAL*6)/2)
451 else if (srate < (XTAL*7)/2)
453 else if (srate < (XTAL*8)/2)
459 sample_rate = pll_mult * XTAL;
462 SYSSymbolRate[21:0] = (srate << 23) / sample_rate
464 We have to use 32 bit unsigned arithmetic without precision loss.
465 The maximum srate is 45000000 or 0x02AEA540. This number has
466 only 6 clear bits on top, hence we can shift it left only 6 bits
467 at a time. Borrowed from cx24110.c
471 ratio = tmp / sample_rate;
473 tmp = (tmp % sample_rate) << 6;
474 ratio = (ratio << 6) + (tmp / sample_rate);
476 tmp = (tmp % sample_rate) << 6;
477 ratio = (ratio << 6) + (tmp / sample_rate);
479 tmp = (tmp % sample_rate) << 5;
480 ratio = (ratio << 5) + (tmp / sample_rate);
483 cx24123_writereg(state, 0x01, pll_mult * 6);
485 cx24123_writereg(state, 0x08, (ratio >> 16) & 0x3f );
486 cx24123_writereg(state, 0x09, (ratio >> 8) & 0xff );
487 cx24123_writereg(state, 0x0a, (ratio ) & 0xff );
489 /* also set the demodulator sample gain */
490 sample_gain = cx24123_int_log2(sample_rate, srate);
491 tmp = cx24123_readreg(state, 0x0c) & ~0xe0;
492 cx24123_writereg(state, 0x0c, tmp | sample_gain << 5);
494 dprintk("%s: srate=%d, ratio=0x%08x, sample_rate=%i sample_gain=%d\n", __FUNCTION__, srate, ratio, sample_rate, sample_gain);
500 * Based on the required frequency and symbolrate, the tuner AGC has to be configured
501 * and the correct band selected. Calculate those values
503 static int cx24123_pll_calculate(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
505 struct cx24123_state *state = fe->demodulator_priv;
506 u32 ndiv = 0, adiv = 0, vco_div = 0;
510 int num_bands = sizeof(cx24123_bandselect_vals) / sizeof(cx24123_bandselect_vals[0]);
512 /* Defaults for low freq, low rate */
513 state->VCAarg = cx24123_AGC_vals[0].VCAprogdata;
514 state->VGAarg = cx24123_AGC_vals[0].VGAprogdata;
515 state->bandselectarg = cx24123_bandselect_vals[0].progdata;
516 vco_div = cx24123_bandselect_vals[0].VCOdivider;
518 /* For the given symbol rate, determine the VCA, VGA and FILTUNE programming bits */
519 for (i = 0; i < sizeof(cx24123_AGC_vals) / sizeof(cx24123_AGC_vals[0]); i++)
521 if ((cx24123_AGC_vals[i].symbolrate_low <= p->u.qpsk.symbol_rate) &&
522 (cx24123_AGC_vals[i].symbolrate_high >= p->u.qpsk.symbol_rate) ) {
523 state->VCAarg = cx24123_AGC_vals[i].VCAprogdata;
524 state->VGAarg = cx24123_AGC_vals[i].VGAprogdata;
525 state->FILTune = cx24123_AGC_vals[i].FILTune;
529 /* determine the band to use */
530 if(force_band < 1 || force_band > num_bands)
532 for (i = 0; i < num_bands; i++)
534 if ((cx24123_bandselect_vals[i].freq_low <= p->frequency) &&
535 (cx24123_bandselect_vals[i].freq_high >= p->frequency) )
540 band = force_band - 1;
542 state->bandselectarg = cx24123_bandselect_vals[band].progdata;
543 vco_div = cx24123_bandselect_vals[band].VCOdivider;
545 /* determine the charge pump current */
546 if ( p->frequency < (cx24123_bandselect_vals[band].freq_low + cx24123_bandselect_vals[band].freq_high)/2 )
551 /* Determine the N/A dividers for the requested lband freq (in kHz). */
552 /* Note: the reference divider R=10, frequency is in KHz, XTAL is in Hz */
553 ndiv = ( ((p->frequency * vco_div * 10) / (2 * XTAL / 1000)) / 32) & 0x1ff;
554 adiv = ( ((p->frequency * vco_div * 10) / (2 * XTAL / 1000)) % 32) & 0x1f;
556 if (adiv == 0 && ndiv > 0)
559 /* control bits 11, refdiv 11, charge pump polarity 1, charge pump current, ndiv, adiv */
560 state->pllarg = (3 << 19) | (3 << 17) | (1 << 16) | (pump << 14) | (ndiv << 5) | adiv;
566 * Tuner data is 21 bits long, must be left-aligned in data.
567 * Tuner cx24109 is written through a dedicated 3wire interface on the demod chip.
569 static int cx24123_pll_writereg(struct dvb_frontend* fe, struct dvb_frontend_parameters *p, u32 data)
571 struct cx24123_state *state = fe->demodulator_priv;
572 unsigned long timeout;
574 dprintk("%s: pll writereg called, data=0x%08x\n",__FUNCTION__,data);
576 /* align the 21 bytes into to bit23 boundary */
579 /* Reset the demod pll word length to 0x15 bits */
580 cx24123_writereg(state, 0x21, 0x15);
582 /* write the msb 8 bits, wait for the send to be completed */
583 timeout = jiffies + msecs_to_jiffies(40);
584 cx24123_writereg(state, 0x22, (data >> 16) & 0xff);
585 while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
586 if (time_after(jiffies, timeout)) {
587 printk("%s: demodulator is not responding, possibly hung, aborting.\n", __FUNCTION__);
593 /* send another 8 bytes, wait for the send to be completed */
594 timeout = jiffies + msecs_to_jiffies(40);
595 cx24123_writereg(state, 0x22, (data>>8) & 0xff );
596 while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
597 if (time_after(jiffies, timeout)) {
598 printk("%s: demodulator is not responding, possibly hung, aborting.\n", __FUNCTION__);
604 /* send the lower 5 bits of this byte, padded with 3 LBB, wait for the send to be completed */
605 timeout = jiffies + msecs_to_jiffies(40);
606 cx24123_writereg(state, 0x22, (data) & 0xff );
607 while ((cx24123_readreg(state, 0x20) & 0x80)) {
608 if (time_after(jiffies, timeout)) {
609 printk("%s: demodulator is not responding, possibly hung, aborting.\n", __FUNCTION__);
615 /* Trigger the demod to configure the tuner */
616 cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) | 2);
617 cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) & 0xfd);
622 static int cx24123_pll_tune(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
624 struct cx24123_state *state = fe->demodulator_priv;
627 dprintk("frequency=%i\n", p->frequency);
629 if (cx24123_pll_calculate(fe, p) != 0) {
630 printk("%s: cx24123_pll_calcutate failed\n",__FUNCTION__);
634 /* Write the new VCO/VGA */
635 cx24123_pll_writereg(fe, p, state->VCAarg);
636 cx24123_pll_writereg(fe, p, state->VGAarg);
638 /* Write the new bandselect and pll args */
639 cx24123_pll_writereg(fe, p, state->bandselectarg);
640 cx24123_pll_writereg(fe, p, state->pllarg);
642 /* set the FILTUNE voltage */
643 val = cx24123_readreg(state, 0x28) & ~0x3;
644 cx24123_writereg(state, 0x27, state->FILTune >> 2);
645 cx24123_writereg(state, 0x28, val | (state->FILTune & 0x3));
647 dprintk("%s: pll tune VCA=%d, band=%d, pll=%d\n",__FUNCTION__,state->VCAarg,
648 state->bandselectarg,state->pllarg);
653 static int cx24123_initfe(struct dvb_frontend* fe)
655 struct cx24123_state *state = fe->demodulator_priv;
658 dprintk("%s: init frontend\n",__FUNCTION__);
660 /* Configure the demod to a good set of defaults */
661 for (i = 0; i < sizeof(cx24123_regdata) / sizeof(cx24123_regdata[0]); i++)
662 cx24123_writereg(state, cx24123_regdata[i].reg, cx24123_regdata[i].data);
664 /* Set the LNB polarity */
665 if(state->config->lnb_polarity)
666 cx24123_writereg(state, 0x32, cx24123_readreg(state, 0x32) | 0x02);
671 static int cx24123_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
673 struct cx24123_state *state = fe->demodulator_priv;
676 val = cx24123_readreg(state, 0x29) & ~0x40;
680 dprintk("%s: setting voltage 13V\n", __FUNCTION__);
681 return cx24123_writereg(state, 0x29, val & 0x7f);
683 dprintk("%s: setting voltage 18V\n", __FUNCTION__);
684 return cx24123_writereg(state, 0x29, val | 0x80);
685 case SEC_VOLTAGE_OFF:
686 /* already handled in cx88-dvb */
695 /* wait for diseqc queue to become ready (or timeout) */
696 static void cx24123_wait_for_diseqc(struct cx24123_state *state)
698 unsigned long timeout = jiffies + msecs_to_jiffies(200);
699 while (!(cx24123_readreg(state, 0x29) & 0x40)) {
700 if(time_after(jiffies, timeout)) {
701 printk("%s: diseqc queue not ready, command may be lost.\n", __FUNCTION__);
708 static int cx24123_send_diseqc_msg(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd *cmd)
710 struct cx24123_state *state = fe->demodulator_priv;
713 dprintk("%s:\n",__FUNCTION__);
715 /* stop continuous tone if enabled */
716 tone = cx24123_readreg(state, 0x29);
718 cx24123_writereg(state, 0x29, tone & ~0x50);
720 /* wait for diseqc queue ready */
721 cx24123_wait_for_diseqc(state);
723 /* select tone mode */
724 cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb);
726 for (i = 0; i < cmd->msg_len; i++)
727 cx24123_writereg(state, 0x2C + i, cmd->msg[i]);
729 val = cx24123_readreg(state, 0x29);
730 cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40) | ((cmd->msg_len-3) & 3));
732 /* wait for diseqc message to finish sending */
733 cx24123_wait_for_diseqc(state);
735 /* restart continuous tone if enabled */
737 cx24123_writereg(state, 0x29, tone & ~0x40);
743 static int cx24123_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
745 struct cx24123_state *state = fe->demodulator_priv;
748 dprintk("%s:\n", __FUNCTION__);
750 /* stop continuous tone if enabled */
751 tone = cx24123_readreg(state, 0x29);
753 cx24123_writereg(state, 0x29, tone & ~0x50);
755 /* wait for diseqc queue ready */
756 cx24123_wait_for_diseqc(state);
758 /* select tone mode */
759 cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) | 0x4);
761 val = cx24123_readreg(state, 0x29);
762 if (burst == SEC_MINI_A)
763 cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x00));
764 else if (burst == SEC_MINI_B)
765 cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x08));
769 cx24123_wait_for_diseqc(state);
770 cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb);
772 /* restart continuous tone if enabled */
774 cx24123_writereg(state, 0x29, tone & ~0x40);
779 static int cx24123_read_status(struct dvb_frontend* fe, fe_status_t* status)
781 struct cx24123_state *state = fe->demodulator_priv;
783 int sync = cx24123_readreg(state, 0x14);
784 int lock = cx24123_readreg(state, 0x20);
788 *status |= FE_HAS_SIGNAL;
790 *status |= FE_HAS_CARRIER; /* Phase locked */
792 *status |= FE_HAS_VITERBI;
794 /* Reed-Solomon Status */
796 *status |= FE_HAS_SYNC;
798 *status |= FE_HAS_LOCK; /*Full Sync */
804 * Configured to return the measurement of errors in blocks, because no UCBLOCKS value
805 * is available, so this value doubles up to satisfy both measurements
807 static int cx24123_read_ber(struct dvb_frontend* fe, u32* ber)
809 struct cx24123_state *state = fe->demodulator_priv;
811 /* The true bit error rate is this value divided by
812 the window size (set as 256 * 255) */
813 *ber = ((cx24123_readreg(state, 0x1c) & 0x3f) << 16) |
814 (cx24123_readreg(state, 0x1d) << 8 |
815 cx24123_readreg(state, 0x1e));
817 dprintk("%s: BER = %d\n",__FUNCTION__,*ber);
822 static int cx24123_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
824 struct cx24123_state *state = fe->demodulator_priv;
826 *signal_strength = cx24123_readreg(state, 0x3b) << 8; /* larger = better */
828 dprintk("%s: Signal strength = %d\n",__FUNCTION__,*signal_strength);
833 static int cx24123_read_snr(struct dvb_frontend* fe, u16* snr)
835 struct cx24123_state *state = fe->demodulator_priv;
837 /* Inverted raw Es/N0 count, totally bogus but better than the
839 *snr = 65535 - (((u16)cx24123_readreg(state, 0x18) << 8) |
840 (u16)cx24123_readreg(state, 0x19));
842 dprintk("%s: read S/N index = %d\n",__FUNCTION__,*snr);
847 static int cx24123_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
849 struct cx24123_state *state = fe->demodulator_priv;
851 dprintk("%s: set_frontend\n",__FUNCTION__);
853 if (state->config->set_ts_params)
854 state->config->set_ts_params(fe, 0);
856 state->currentfreq=p->frequency;
857 state->currentsymbolrate = p->u.qpsk.symbol_rate;
859 cx24123_set_inversion(state, p->inversion);
860 cx24123_set_fec(state, p->u.qpsk.fec_inner);
861 cx24123_set_symbolrate(state, p->u.qpsk.symbol_rate);
862 cx24123_pll_tune(fe, p);
864 /* Enable automatic aquisition and reset cycle */
865 cx24123_writereg(state, 0x03, (cx24123_readreg(state, 0x03) | 0x07));
866 cx24123_writereg(state, 0x00, 0x10);
867 cx24123_writereg(state, 0x00, 0);
872 static int cx24123_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
874 struct cx24123_state *state = fe->demodulator_priv;
876 dprintk("%s: get_frontend\n",__FUNCTION__);
878 if (cx24123_get_inversion(state, &p->inversion) != 0) {
879 printk("%s: Failed to get inversion status\n",__FUNCTION__);
882 if (cx24123_get_fec(state, &p->u.qpsk.fec_inner) != 0) {
883 printk("%s: Failed to get fec status\n",__FUNCTION__);
886 p->frequency = state->currentfreq;
887 p->u.qpsk.symbol_rate = state->currentsymbolrate;
892 static int cx24123_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
894 struct cx24123_state *state = fe->demodulator_priv;
897 /* wait for diseqc queue ready */
898 cx24123_wait_for_diseqc(state);
900 val = cx24123_readreg(state, 0x29) & ~0x40;
904 dprintk("%s: setting tone on\n", __FUNCTION__);
905 return cx24123_writereg(state, 0x29, val | 0x10);
907 dprintk("%s: setting tone off\n",__FUNCTION__);
908 return cx24123_writereg(state, 0x29, val & 0xef);
910 printk("%s: CASE reached default with tone=%d\n", __FUNCTION__, tone);
917 static int cx24123_tune(struct dvb_frontend* fe,
918 struct dvb_frontend_parameters* params,
919 unsigned int mode_flags,
926 retval = cx24123_set_frontend(fe, params);
928 if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
929 cx24123_read_status(fe, status);
935 static int cx24123_get_algo(struct dvb_frontend *fe)
937 return 1; //FE_ALGO_HW
940 static void cx24123_release(struct dvb_frontend* fe)
942 struct cx24123_state* state = fe->demodulator_priv;
943 dprintk("%s\n",__FUNCTION__);
947 static struct dvb_frontend_ops cx24123_ops;
949 struct dvb_frontend* cx24123_attach(const struct cx24123_config* config,
950 struct i2c_adapter* i2c)
952 struct cx24123_state* state = NULL;
955 dprintk("%s\n",__FUNCTION__);
957 /* allocate memory for the internal state */
958 state = kmalloc(sizeof(struct cx24123_state), GFP_KERNEL);
960 printk("Unable to kmalloc\n");
964 /* setup the state */
965 state->config = config;
969 state->bandselectarg = 0;
971 state->currentfreq = 0;
972 state->currentsymbolrate = 0;
974 /* check if the demod is there */
975 ret = cx24123_readreg(state, 0x00);
976 if ((ret != 0xd1) && (ret != 0xe1)) {
977 printk("Version != d1 or e1\n");
981 /* create dvb_frontend */
982 memcpy(&state->frontend.ops, &cx24123_ops, sizeof(struct dvb_frontend_ops));
983 state->frontend.demodulator_priv = state;
984 return &state->frontend;
992 static struct dvb_frontend_ops cx24123_ops = {
995 .name = "Conexant CX24123/CX24109",
997 .frequency_min = 950000,
998 .frequency_max = 2150000,
999 .frequency_stepsize = 1011, /* kHz for QPSK frontends */
1000 .frequency_tolerance = 5000,
1001 .symbol_rate_min = 1000000,
1002 .symbol_rate_max = 45000000,
1003 .caps = FE_CAN_INVERSION_AUTO |
1004 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
1005 FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
1006 FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
1007 FE_CAN_QPSK | FE_CAN_RECOVER
1010 .release = cx24123_release,
1012 .init = cx24123_initfe,
1013 .set_frontend = cx24123_set_frontend,
1014 .get_frontend = cx24123_get_frontend,
1015 .read_status = cx24123_read_status,
1016 .read_ber = cx24123_read_ber,
1017 .read_signal_strength = cx24123_read_signal_strength,
1018 .read_snr = cx24123_read_snr,
1019 .diseqc_send_master_cmd = cx24123_send_diseqc_msg,
1020 .diseqc_send_burst = cx24123_diseqc_send_burst,
1021 .set_tone = cx24123_set_tone,
1022 .set_voltage = cx24123_set_voltage,
1023 .tune = cx24123_tune,
1024 .get_frontend_algo = cx24123_get_algo,
1027 module_param(debug, int, 0644);
1028 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
1030 module_param(force_band, int, 0644);
1031 MODULE_PARM_DESC(force_band, "Force a specific band select (1-9, default:off).");
1033 MODULE_DESCRIPTION("DVB Frontend module for Conexant cx24123/cx24109 hardware");
1034 MODULE_AUTHOR("Steven Toth");
1035 MODULE_LICENSE("GPL");
1037 EXPORT_SYMBOL(cx24123_attach);