2 cx24110 - Single Chip Satellite Channel Receiver driver module
4 Copyright (C) 2002 Peter Hettkamp <peter.hettkamp@htp-tel.de> based on
6 Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
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
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/slab.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
30 #include "dvb_frontend.h"
34 struct cx24110_state {
36 struct i2c_adapter* i2c;
38 const struct cx24110_config* config;
40 struct dvb_frontend frontend;
48 #define dprintk(args...) \
50 if (debug) printk(KERN_DEBUG "cx24110: " args); \
53 static struct {u8 reg; u8 data;} cx24110_regdata[]=
54 /* Comments beginning with @ denote this value should
56 {{0x09,0x01}, /* SoftResetAll */
57 {0x09,0x00}, /* release reset */
58 {0x01,0xe8}, /* MSB of code rate 27.5MS/s */
59 {0x02,0x17}, /* middle byte " */
60 {0x03,0x29}, /* LSB " */
61 {0x05,0x03}, /* @ DVB mode, standard code rate 3/4 */
62 {0x06,0xa5}, /* @ PLL 60MHz */
63 {0x07,0x01}, /* @ Fclk, i.e. sampling clock, 60MHz */
64 {0x0a,0x00}, /* @ partial chip disables, do not set */
65 {0x0b,0x01}, /* set output clock in gapped mode, start signal low
66 active for first byte */
67 {0x0c,0x11}, /* no parity bytes, large hold time, serial data out */
68 {0x0d,0x6f}, /* @ RS Sync/Unsync thresholds */
69 {0x10,0x40}, /* chip doc is misleading here: write bit 6 as 1
70 to avoid starting the BER counter. Reset the
71 CRC test bit. Finite counting selected */
72 {0x15,0xff}, /* @ size of the limited time window for RS BER
73 estimation. It is <value>*256 RS blocks, this
74 gives approx. 2.6 sec at 27.5MS/s, rate 3/4 */
75 {0x16,0x00}, /* @ enable all RS output ports */
76 {0x17,0x04}, /* @ time window allowed for the RS to sync */
77 {0x18,0xae}, /* @ allow all standard DVB code rates to be scanned
79 /* leave the current code rate and normalization
80 registers as they are after reset... */
81 {0x21,0x10}, /* @ during AutoAcq, search each viterbi setting
83 {0x23,0x18}, /* @ size of the limited time window for Viterbi BER
84 estimation. It is <value>*65536 channel bits, i.e.
85 approx. 38ms at 27.5MS/s, rate 3/4 */
86 {0x24,0x24}, /* do not trigger Viterbi CRC test. Finite count window */
87 /* leave front-end AGC parameters at default values */
88 /* leave decimation AGC parameters at default values */
89 {0x35,0x40}, /* disable all interrupts. They are not connected anyway */
90 {0x36,0xff}, /* clear all interrupt pending flags */
91 {0x37,0x00}, /* @ fully enable AutoAcqq state machine */
92 {0x38,0x07}, /* @ enable fade recovery, but not autostart AutoAcq */
93 /* leave the equalizer parameters on their default values */
94 /* leave the final AGC parameters on their default values */
95 {0x41,0x00}, /* @ MSB of front-end derotator frequency */
96 {0x42,0x00}, /* @ middle bytes " */
97 {0x43,0x00}, /* @ LSB " */
98 /* leave the carrier tracking loop parameters on default */
99 /* leave the bit timing loop parameters at gefault */
100 {0x56,0x4d}, /* set the filtune voltage to 2.7V, as recommended by */
101 /* the cx24108 data sheet for symbol rates above 15MS/s */
102 {0x57,0x00}, /* @ Filter sigma delta enabled, positive */
103 {0x61,0x95}, /* GPIO pins 1-4 have special function */
104 {0x62,0x05}, /* GPIO pin 5 has special function, pin 6 is GPIO */
105 {0x63,0x00}, /* All GPIO pins use CMOS output characteristics */
106 {0x64,0x20}, /* GPIO 6 is input, all others are outputs */
107 {0x6d,0x30}, /* tuner auto mode clock freq 62kHz */
108 {0x70,0x15}, /* use auto mode, tuner word is 21 bits long */
109 {0x73,0x00}, /* @ disable several demod bypasses */
110 {0x74,0x00}, /* @ " */
111 {0x75,0x00} /* @ " */
112 /* the remaining registers are for SEC */
116 static int cx24110_writereg (struct cx24110_state* state, int reg, int data)
118 u8 buf [] = { reg, data };
119 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
122 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
123 dprintk ("%s: writereg error (err == %i, reg == 0x%02x,"
124 " data == 0x%02x)\n", __func__, err, reg, data);
131 static int cx24110_readreg (struct cx24110_state* state, u8 reg)
136 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
137 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
139 ret = i2c_transfer(state->i2c, msg, 2);
141 if (ret != 2) return ret;
146 static int cx24110_set_inversion (struct cx24110_state* state, fe_spectral_inversion_t inversion)
148 /* fixme (low): error handling */
152 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x1);
153 /* AcqSpectrInvDis on. No idea why someone should want this */
154 cx24110_writereg(state,0x5,cx24110_readreg(state,0x5)&0xf7);
155 /* Initial value 0 at start of acq */
156 cx24110_writereg(state,0x22,cx24110_readreg(state,0x22)&0xef);
157 /* current value 0 */
158 /* The cx24110 manual tells us this reg is read-only.
159 But what the heck... set it ayways */
162 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x1);
163 /* AcqSpectrInvDis on. No idea why someone should want this */
164 cx24110_writereg(state,0x5,cx24110_readreg(state,0x5)|0x08);
165 /* Initial value 1 at start of acq */
166 cx24110_writereg(state,0x22,cx24110_readreg(state,0x22)|0x10);
167 /* current value 1 */
170 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)&0xfe);
171 /* AcqSpectrInvDis off. Leave initial & current states as is */
180 static int cx24110_set_fec (struct cx24110_state* state, fe_code_rate_t fec)
182 /* fixme (low): error handling */
184 static const int rate[]={-1,1,2,3,5,7,-1};
185 static const int g1[]={-1,0x01,0x02,0x05,0x15,0x45,-1};
186 static const int g2[]={-1,0x01,0x03,0x06,0x1a,0x7a,-1};
188 /* Well, the AutoAcq engine of the cx24106 and 24110 automatically
189 searches all enabled viterbi rates, and can handle non-standard
195 if (fec==FEC_AUTO) { /* (re-)establish AutoAcq behaviour */
196 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)&0xdf);
197 /* clear AcqVitDis bit */
198 cx24110_writereg(state,0x18,0xae);
199 /* allow all DVB standard code rates */
200 cx24110_writereg(state,0x05,(cx24110_readreg(state,0x05)&0xf0)|0x3);
201 /* set nominal Viterbi rate 3/4 */
202 cx24110_writereg(state,0x22,(cx24110_readreg(state,0x22)&0xf0)|0x3);
203 /* set current Viterbi rate 3/4 */
204 cx24110_writereg(state,0x1a,0x05); cx24110_writereg(state,0x1b,0x06);
205 /* set the puncture registers for code rate 3/4 */
208 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x20);
209 /* set AcqVitDis bit */
211 cx24110_writereg(state,0x05,(cx24110_readreg(state,0x05)&0xf0)|rate[fec]);
212 /* set nominal Viterbi rate */
213 cx24110_writereg(state,0x22,(cx24110_readreg(state,0x22)&0xf0)|rate[fec]);
214 /* set current Viterbi rate */
215 cx24110_writereg(state,0x1a,g1[fec]);
216 cx24110_writereg(state,0x1b,g2[fec]);
217 /* not sure if this is the right way: I always used AutoAcq mode */
220 /* fixme (low): which is the correct return code? */
225 static fe_code_rate_t cx24110_get_fec (struct cx24110_state* state)
229 i=cx24110_readreg(state,0x22)&0x0f;
231 return FEC_1_2 + i - 1;
233 /* fixme (low): a special code rate has been selected. In theory, we need to
234 return a denominator value, a numerator value, and a pair of puncture
235 maps to correctly describe this mode. But this should never happen in
236 practice, because it cannot be set by cx24110_get_fec. */
241 static int cx24110_set_symbolrate (struct cx24110_state* state, u32 srate)
243 /* fixme (low): add error handling */
247 static const u32 bands[]={5000000UL,15000000UL,90999000UL/2};
250 dprintk("cx24110 debug: entering %s(%d)\n",__func__,srate);
251 if (srate>90999000UL/2)
256 for(i = 0; (i < ARRAY_SIZE(bands)) && (srate>bands[i]); i++)
258 /* first, check which sample rate is appropriate: 45, 60 80 or 90 MHz,
259 and set the PLL accordingly (R07[1:0] Fclk, R06[7:4] PLLmult,
260 R06[3:0] PLLphaseDetGain */
261 tmp=cx24110_readreg(state,0x07)&0xfc;
262 if(srate<90999000UL/4) { /* sample rate 45MHz*/
263 cx24110_writereg(state,0x07,tmp);
264 cx24110_writereg(state,0x06,0x78);
266 } else if(srate<60666000UL/2) { /* sample rate 60MHz */
267 cx24110_writereg(state,0x07,tmp|0x1);
268 cx24110_writereg(state,0x06,0xa5);
270 } else if(srate<80888000UL/2) { /* sample rate 80MHz */
271 cx24110_writereg(state,0x07,tmp|0x2);
272 cx24110_writereg(state,0x06,0x87);
274 } else { /* sample rate 90MHz */
275 cx24110_writereg(state,0x07,tmp|0x3);
276 cx24110_writereg(state,0x06,0x78);
279 dprintk("cx24110 debug: fclk %d Hz\n",fclk);
280 /* we need to divide two integers with approx. 27 bits in 32 bit
281 arithmetic giving a 25 bit result */
282 /* the maximum dividend is 90999000/2, 0x02b6446c, this number is
283 also the most complex divisor. Hence, the dividend has,
284 assuming 32bit unsigned arithmetic, 6 clear bits on top, the
285 divisor 2 unused bits at the bottom. Also, the quotient is
286 always less than 1/2. Borrowed from VES1893.c, of course */
293 ratio=(ratio<<8)+(tmp/BDRI);
296 ratio=(ratio<<8)+(tmp/BDRI);
299 ratio=(ratio<<1)+(tmp/BDRI);
301 dprintk("srate= %d (range %d, up to %d)\n", srate,i,bands[i]);
302 dprintk("fclk = %d\n", fclk);
303 dprintk("ratio= %08x\n", ratio);
305 cx24110_writereg(state, 0x1, (ratio>>16)&0xff);
306 cx24110_writereg(state, 0x2, (ratio>>8)&0xff);
307 cx24110_writereg(state, 0x3, (ratio)&0xff);
313 static int _cx24110_pll_write (struct dvb_frontend* fe, u8 *buf, int len)
315 struct cx24110_state *state = fe->demodulator_priv;
320 /* tuner data is 21 bits long, must be left-aligned in data */
321 /* tuner cx24108 is written through a dedicated 3wire interface on the demod chip */
322 /* FIXME (low): add error handling, avoid infinite loops if HW fails... */
324 cx24110_writereg(state,0x6d,0x30); /* auto mode at 62kHz */
325 cx24110_writereg(state,0x70,0x15); /* auto mode 21 bits */
327 /* if the auto tuner writer is still busy, clear it out */
328 while (cx24110_readreg(state,0x6d)&0x80)
329 cx24110_writereg(state,0x72,0);
331 /* write the topmost 8 bits */
332 cx24110_writereg(state,0x72,buf[0]);
334 /* wait for the send to be completed */
335 while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
338 /* send another 8 bytes */
339 cx24110_writereg(state,0x72,buf[1]);
340 while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
343 /* and the topmost 5 bits of this byte */
344 cx24110_writereg(state,0x72,buf[2]);
345 while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
348 /* now strobe the enable line once */
349 cx24110_writereg(state,0x6d,0x32);
350 cx24110_writereg(state,0x6d,0x30);
355 static int cx24110_initfe(struct dvb_frontend* fe)
357 struct cx24110_state *state = fe->demodulator_priv;
358 /* fixme (low): error handling */
361 dprintk("%s: init chip\n", __func__);
363 for(i = 0; i < ARRAY_SIZE(cx24110_regdata); i++) {
364 cx24110_writereg(state, cx24110_regdata[i].reg, cx24110_regdata[i].data);
370 static int cx24110_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
372 struct cx24110_state *state = fe->demodulator_priv;
376 return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&0x3b)|0xc0);
378 return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&0x3b)|0x40);
384 static int cx24110_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
387 struct cx24110_state *state = fe->demodulator_priv;
388 unsigned long timeout;
390 if (burst == SEC_MINI_A)
392 else if (burst == SEC_MINI_B)
397 rv = cx24110_readreg(state, 0x77);
399 cx24110_writereg(state, 0x77, rv | 0x04);
401 rv = cx24110_readreg(state, 0x76);
402 cx24110_writereg(state, 0x76, ((rv & 0x90) | 0x40 | bit));
403 timeout = jiffies + msecs_to_jiffies(100);
404 while (!time_after(jiffies, timeout) && !(cx24110_readreg(state, 0x76) & 0x40))
405 ; /* wait for LNB ready */
410 static int cx24110_send_diseqc_msg(struct dvb_frontend* fe,
411 struct dvb_diseqc_master_cmd *cmd)
414 struct cx24110_state *state = fe->demodulator_priv;
415 unsigned long timeout;
417 if (cmd->msg_len < 3 || cmd->msg_len > 6)
418 return -EINVAL; /* not implemented */
420 for (i = 0; i < cmd->msg_len; i++)
421 cx24110_writereg(state, 0x79 + i, cmd->msg[i]);
423 rv = cx24110_readreg(state, 0x77);
425 cx24110_writereg(state, 0x77, rv & ~0x04);
426 msleep(30); /* reportedly fixes switching problems */
429 rv = cx24110_readreg(state, 0x76);
431 cx24110_writereg(state, 0x76, ((rv & 0x90) | 0x40) | ((cmd->msg_len-3) & 3));
432 timeout = jiffies + msecs_to_jiffies(100);
433 while (!time_after(jiffies, timeout) && !(cx24110_readreg(state, 0x76) & 0x40))
434 ; /* wait for LNB ready */
439 static int cx24110_read_status(struct dvb_frontend* fe, fe_status_t* status)
441 struct cx24110_state *state = fe->demodulator_priv;
443 int sync = cx24110_readreg (state, 0x55);
448 *status |= FE_HAS_SIGNAL;
451 *status |= FE_HAS_CARRIER;
453 sync = cx24110_readreg (state, 0x08);
456 *status |= FE_HAS_VITERBI;
459 *status |= FE_HAS_SYNC;
461 if ((sync & 0x60) == 0x60)
462 *status |= FE_HAS_LOCK;
467 static int cx24110_read_ber(struct dvb_frontend* fe, u32* ber)
469 struct cx24110_state *state = fe->demodulator_priv;
471 /* fixme (maybe): value range is 16 bit. Scale? */
472 if(cx24110_readreg(state,0x24)&0x10) {
473 /* the Viterbi error counter has finished one counting window */
474 cx24110_writereg(state,0x24,0x04); /* select the ber reg */
475 state->lastber=cx24110_readreg(state,0x25)|
476 (cx24110_readreg(state,0x26)<<8);
477 cx24110_writereg(state,0x24,0x04); /* start new count window */
478 cx24110_writereg(state,0x24,0x14);
480 *ber = state->lastber;
485 static int cx24110_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
487 struct cx24110_state *state = fe->demodulator_priv;
489 /* no provision in hardware. Read the frontend AGC accumulator. No idea how to scale this, but I know it is 2s complement */
490 u8 signal = cx24110_readreg (state, 0x27)+128;
491 *signal_strength = (signal << 8) | signal;
496 static int cx24110_read_snr(struct dvb_frontend* fe, u16* snr)
498 struct cx24110_state *state = fe->demodulator_priv;
500 /* no provision in hardware. Can be computed from the Es/N0 estimator, but I don't know how. */
501 if(cx24110_readreg(state,0x6a)&0x80) {
502 /* the Es/N0 error counter has finished one counting window */
503 state->lastesn0=cx24110_readreg(state,0x69)|
504 (cx24110_readreg(state,0x68)<<8);
505 cx24110_writereg(state,0x6a,0x84); /* start new count window */
507 *snr = state->lastesn0;
512 static int cx24110_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
514 struct cx24110_state *state = fe->demodulator_priv;
517 if(cx24110_readreg(state,0x10)&0x40) {
518 /* the RS error counter has finished one counting window */
519 cx24110_writereg(state,0x10,0x60); /* select the byer reg */
520 lastbyer=cx24110_readreg(state,0x12)|
521 (cx24110_readreg(state,0x13)<<8)|
522 (cx24110_readreg(state,0x14)<<16);
523 cx24110_writereg(state,0x10,0x70); /* select the bler reg */
524 state->lastbler=cx24110_readreg(state,0x12)|
525 (cx24110_readreg(state,0x13)<<8)|
526 (cx24110_readreg(state,0x14)<<16);
527 cx24110_writereg(state,0x10,0x20); /* start new count window */
529 *ucblocks = state->lastbler;
534 static int cx24110_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
536 struct cx24110_state *state = fe->demodulator_priv;
539 if (fe->ops.tuner_ops.set_params) {
540 fe->ops.tuner_ops.set_params(fe, p);
541 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
544 cx24110_set_inversion (state, p->inversion);
545 cx24110_set_fec (state, p->u.qpsk.fec_inner);
546 cx24110_set_symbolrate (state, p->u.qpsk.symbol_rate);
547 cx24110_writereg(state,0x04,0x05); /* start aquisition */
552 static int cx24110_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
554 struct cx24110_state *state = fe->demodulator_priv;
555 s32 afc; unsigned sclk;
557 /* cannot read back tuner settings (freq). Need to have some private storage */
559 sclk = cx24110_readreg (state, 0x07) & 0x03;
560 /* ok, real AFC (FEDR) freq. is afc/2^24*fsamp, fsamp=45/60/80/90MHz.
561 * Need 64 bit arithmetic. Is thiss possible in the kernel? */
562 if (sclk==0) sclk=90999000L/2L;
563 else if (sclk==1) sclk=60666000L;
564 else if (sclk==2) sclk=80888000L;
567 afc = sclk*(cx24110_readreg (state, 0x44)&0x1f)+
568 ((sclk*cx24110_readreg (state, 0x45))>>8)+
569 ((sclk*cx24110_readreg (state, 0x46))>>16);
572 p->inversion = (cx24110_readreg (state, 0x22) & 0x10) ?
573 INVERSION_ON : INVERSION_OFF;
574 p->u.qpsk.fec_inner = cx24110_get_fec (state);
579 static int cx24110_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
581 struct cx24110_state *state = fe->demodulator_priv;
583 return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&~0x10)|(((tone==SEC_TONE_ON))?0x10:0));
586 static void cx24110_release(struct dvb_frontend* fe)
588 struct cx24110_state* state = fe->demodulator_priv;
592 static struct dvb_frontend_ops cx24110_ops;
594 struct dvb_frontend* cx24110_attach(const struct cx24110_config* config,
595 struct i2c_adapter* i2c)
597 struct cx24110_state* state = NULL;
600 /* allocate memory for the internal state */
601 state = kmalloc(sizeof(struct cx24110_state), GFP_KERNEL);
602 if (state == NULL) goto error;
604 /* setup the state */
605 state->config = config;
611 /* check if the demod is there */
612 ret = cx24110_readreg(state, 0x00);
613 if ((ret != 0x5a) && (ret != 0x69)) goto error;
615 /* create dvb_frontend */
616 memcpy(&state->frontend.ops, &cx24110_ops, sizeof(struct dvb_frontend_ops));
617 state->frontend.demodulator_priv = state;
618 return &state->frontend;
625 static struct dvb_frontend_ops cx24110_ops = {
628 .name = "Conexant CX24110 DVB-S",
630 .frequency_min = 950000,
631 .frequency_max = 2150000,
632 .frequency_stepsize = 1011, /* kHz for QPSK frontends */
633 .frequency_tolerance = 29500,
634 .symbol_rate_min = 1000000,
635 .symbol_rate_max = 45000000,
636 .caps = FE_CAN_INVERSION_AUTO |
637 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
638 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
639 FE_CAN_QPSK | FE_CAN_RECOVER
642 .release = cx24110_release,
644 .init = cx24110_initfe,
645 .write = _cx24110_pll_write,
646 .set_frontend = cx24110_set_frontend,
647 .get_frontend = cx24110_get_frontend,
648 .read_status = cx24110_read_status,
649 .read_ber = cx24110_read_ber,
650 .read_signal_strength = cx24110_read_signal_strength,
651 .read_snr = cx24110_read_snr,
652 .read_ucblocks = cx24110_read_ucblocks,
654 .diseqc_send_master_cmd = cx24110_send_diseqc_msg,
655 .set_tone = cx24110_set_tone,
656 .set_voltage = cx24110_set_voltage,
657 .diseqc_send_burst = cx24110_diseqc_send_burst,
660 module_param(debug, int, 0644);
661 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
663 MODULE_DESCRIPTION("Conexant CX24110 DVB-S Demodulator driver");
664 MODULE_AUTHOR("Peter Hettkamp");
665 MODULE_LICENSE("GPL");
667 EXPORT_SYMBOL(cx24110_attach);