1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for Zarlink zl10036 DVB-S silicon tuner
4 *
5 * Copyright (C) 2006 Tino Reichardt
6 * Copyright (C) 2007-2009 Matthias Schwarzott <zzam@gentoo.de>
7 *
8 **
9 * The data sheet for this tuner can be found at:
10 * http://www.mcmilk.de/projects/dvb-card/datasheets/ZL10036.pdf
11 *
12 * This one is working: (at my Avermedia DVB-S Pro)
13 * - zl10036 (40pin, FTA)
14 *
15 * A driver for zl10038 should be very similar.
16 */
17
18 #include <linux/module.h>
19 #include <linux/dvb/frontend.h>
20 #include <linux/slab.h>
21 #include <linux/types.h>
22
23 #include "zl10036.h"
24
25 static int zl10036_debug;
26 #define dprintk(level, args...) \
27 do { if (zl10036_debug & level) printk(KERN_DEBUG "zl10036: " args); \
28 } while (0)
29
30 #define deb_info(args...) dprintk(0x01, args)
31 #define deb_i2c(args...) dprintk(0x02, args)
32
33 struct zl10036_state {
34 struct i2c_adapter *i2c;
35 const struct zl10036_config *config;
36 u32 frequency;
37 u8 br, bf;
38 };
39
40
41 /* This driver assumes the tuner is driven by a 10.111MHz Cristal */
42 #define _XTAL 10111
43
44 /* Some of the possible dividers:
45 * 64, (write 0x05 to reg), freq step size 158kHz
46 * 10, (write 0x0a to reg), freq step size 1.011kHz (used here)
47 * 5, (write 0x09 to reg), freq step size 2.022kHz
48 */
49
50 #define _RDIV 10
51 #define _RDIV_REG 0x0a
52 #define _FR (_XTAL/_RDIV)
53
54 #define STATUS_POR 0x80 /* Power on Reset */
55 #define STATUS_FL 0x40 /* Frequency & Phase Lock */
56
57 /* read/write for zl10036 and zl10038 */
58
zl10036_read_status_reg(struct zl10036_state * state)59 static int zl10036_read_status_reg(struct zl10036_state *state)
60 {
61 u8 status;
62 struct i2c_msg msg[1] = {
63 { .addr = state->config->tuner_address, .flags = I2C_M_RD,
64 .buf = &status, .len = sizeof(status) },
65 };
66
67 if (i2c_transfer(state->i2c, msg, 1) != 1) {
68 printk(KERN_ERR "%s: i2c read failed at addr=%02x\n",
69 __func__, state->config->tuner_address);
70 return -EIO;
71 }
72
73 deb_i2c("R(status): %02x [FL=%d]\n", status,
74 (status & STATUS_FL) ? 1 : 0);
75 if (status & STATUS_POR)
76 deb_info("%s: Power-On-Reset bit enabled - need to initialize the tuner\n",
77 __func__);
78
79 return status;
80 }
81
zl10036_write(struct zl10036_state * state,u8 buf[],u8 count)82 static int zl10036_write(struct zl10036_state *state, u8 buf[], u8 count)
83 {
84 struct i2c_msg msg[1] = {
85 { .addr = state->config->tuner_address, .flags = 0,
86 .buf = buf, .len = count },
87 };
88 u8 reg = 0;
89 int ret;
90
91 if (zl10036_debug & 0x02) {
92 /* every 8bit-value satisifes this!
93 * so only check for debug log */
94 if ((buf[0] & 0x80) == 0x00)
95 reg = 2;
96 else if ((buf[0] & 0xc0) == 0x80)
97 reg = 4;
98 else if ((buf[0] & 0xf0) == 0xc0)
99 reg = 6;
100 else if ((buf[0] & 0xf0) == 0xd0)
101 reg = 8;
102 else if ((buf[0] & 0xf0) == 0xe0)
103 reg = 10;
104 else if ((buf[0] & 0xf0) == 0xf0)
105 reg = 12;
106
107 deb_i2c("W(%d):", reg);
108 {
109 int i;
110 for (i = 0; i < count; i++)
111 printk(KERN_CONT " %02x", buf[i]);
112 printk(KERN_CONT "\n");
113 }
114 }
115
116 ret = i2c_transfer(state->i2c, msg, 1);
117 if (ret != 1) {
118 printk(KERN_ERR "%s: i2c error, ret=%d\n", __func__, ret);
119 return -EIO;
120 }
121
122 return 0;
123 }
124
zl10036_release(struct dvb_frontend * fe)125 static void zl10036_release(struct dvb_frontend *fe)
126 {
127 struct zl10036_state *state = fe->tuner_priv;
128
129 fe->tuner_priv = NULL;
130 kfree(state);
131 }
132
zl10036_sleep(struct dvb_frontend * fe)133 static int zl10036_sleep(struct dvb_frontend *fe)
134 {
135 struct zl10036_state *state = fe->tuner_priv;
136 u8 buf[] = { 0xf0, 0x80 }; /* regs 12/13 */
137 int ret;
138
139 deb_info("%s\n", __func__);
140
141 if (fe->ops.i2c_gate_ctrl)
142 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
143
144 ret = zl10036_write(state, buf, sizeof(buf));
145
146 if (fe->ops.i2c_gate_ctrl)
147 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
148
149 return ret;
150 }
151
152 /*
153 * register map of the ZL10036/ZL10038
154 *
155 * reg[default] content
156 * 2[0x00]: 0 | N14 | N13 | N12 | N11 | N10 | N9 | N8
157 * 3[0x00]: N7 | N6 | N5 | N4 | N3 | N2 | N1 | N0
158 * 4[0x80]: 1 | 0 | RFG | BA1 | BA0 | BG1 | BG0 | LEN
159 * 5[0x00]: P0 | C1 | C0 | R4 | R3 | R2 | R1 | R0
160 * 6[0xc0]: 1 | 1 | 0 | 0 | RSD | 0 | 0 | 0
161 * 7[0x20]: P1 | BF6 | BF5 | BF4 | BF3 | BF2 | BF1 | 0
162 * 8[0xdb]: 1 | 1 | 0 | 1 | 0 | CC | 1 | 1
163 * 9[0x30]: VSD | V2 | V1 | V0 | S3 | S2 | S1 | S0
164 * 10[0xe1]: 1 | 1 | 1 | 0 | 0 | LS2 | LS1 | LS0
165 * 11[0xf5]: WS | WH2 | WH1 | WH0 | WL2 | WL1 | WL0 | WRE
166 * 12[0xf0]: 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0
167 * 13[0x28]: PD | BR4 | BR3 | BR2 | BR1 | BR0 | CLR | TL
168 */
169
zl10036_set_frequency(struct zl10036_state * state,u32 frequency)170 static int zl10036_set_frequency(struct zl10036_state *state, u32 frequency)
171 {
172 u8 buf[2];
173 u32 div, foffset;
174
175 div = (frequency + _FR/2) / _FR;
176 state->frequency = div * _FR;
177
178 foffset = frequency - state->frequency;
179
180 buf[0] = (div >> 8) & 0x7f;
181 buf[1] = (div >> 0) & 0xff;
182
183 deb_info("%s: ftodo=%u fpriv=%u ferr=%d div=%u\n", __func__,
184 frequency, state->frequency, foffset, div);
185
186 return zl10036_write(state, buf, sizeof(buf));
187 }
188
zl10036_set_bandwidth(struct zl10036_state * state,u32 fbw)189 static int zl10036_set_bandwidth(struct zl10036_state *state, u32 fbw)
190 {
191 /* fbw is measured in kHz */
192 u8 br, bf;
193 int ret;
194 u8 buf_bf[] = {
195 0xc0, 0x00, /* 6/7: rsd=0 bf=0 */
196 };
197 u8 buf_br[] = {
198 0xf0, 0x00, /* 12/13: br=0xa clr=0 tl=0*/
199 };
200 u8 zl10036_rsd_off[] = { 0xc8 }; /* set RSD=1 */
201
202 /* ensure correct values */
203 if (fbw > 35000)
204 fbw = 35000;
205 if (fbw < 8000)
206 fbw = 8000;
207
208 #define _BR_MAXIMUM (_XTAL/575) /* _XTAL / 575kHz = 17 */
209
210 /* <= 28,82 MHz */
211 if (fbw <= 28820) {
212 br = _BR_MAXIMUM;
213 } else {
214 /*
215 * f(bw)=34,6MHz f(xtal)=10.111MHz
216 * br = (10111/34600) * 63 * 1/K = 14;
217 */
218 br = ((_XTAL * 21 * 1000) / (fbw * 419));
219 }
220
221 /* ensure correct values */
222 if (br < 4)
223 br = 4;
224 if (br > _BR_MAXIMUM)
225 br = _BR_MAXIMUM;
226
227 /*
228 * k = 1.257
229 * bf = fbw/_XTAL * br * k - 1 */
230
231 bf = (fbw * br * 1257) / (_XTAL * 1000) - 1;
232
233 /* ensure correct values */
234 if (bf > 62)
235 bf = 62;
236
237 buf_bf[1] = (bf << 1) & 0x7e;
238 buf_br[1] = (br << 2) & 0x7c;
239 deb_info("%s: BW=%d br=%u bf=%u\n", __func__, fbw, br, bf);
240
241 if (br != state->br) {
242 ret = zl10036_write(state, buf_br, sizeof(buf_br));
243 if (ret < 0)
244 return ret;
245 }
246
247 if (bf != state->bf) {
248 ret = zl10036_write(state, buf_bf, sizeof(buf_bf));
249 if (ret < 0)
250 return ret;
251
252 /* time = br/(32* fxtal) */
253 /* minimal sleep time to be calculated
254 * maximum br is 63 -> max time = 2 /10 MHz = 2e-7 */
255 msleep(1);
256
257 ret = zl10036_write(state, zl10036_rsd_off,
258 sizeof(zl10036_rsd_off));
259 if (ret < 0)
260 return ret;
261 }
262
263 state->br = br;
264 state->bf = bf;
265
266 return 0;
267 }
268
zl10036_set_gain_params(struct zl10036_state * state,int c)269 static int zl10036_set_gain_params(struct zl10036_state *state,
270 int c)
271 {
272 u8 buf[2];
273 u8 rfg, ba, bg;
274
275 /* default values */
276 rfg = 0; /* enable when using an lna */
277 ba = 1;
278 bg = 1;
279
280 /* reg 4 */
281 buf[0] = 0x80 | ((rfg << 5) & 0x20)
282 | ((ba << 3) & 0x18) | ((bg << 1) & 0x06);
283
284 if (!state->config->rf_loop_enable)
285 buf[0] |= 0x01;
286
287 /* P0=0 */
288 buf[1] = _RDIV_REG | ((c << 5) & 0x60);
289
290 deb_info("%s: c=%u rfg=%u ba=%u bg=%u\n", __func__, c, rfg, ba, bg);
291 return zl10036_write(state, buf, sizeof(buf));
292 }
293
zl10036_set_params(struct dvb_frontend * fe)294 static int zl10036_set_params(struct dvb_frontend *fe)
295 {
296 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
297 struct zl10036_state *state = fe->tuner_priv;
298 int ret = 0;
299 u32 frequency = p->frequency;
300 u32 fbw;
301 int i;
302 u8 c;
303
304 /* ensure correct values
305 * maybe redundant as core already checks this */
306 if ((frequency < fe->ops.info.frequency_min_hz / kHz)
307 || (frequency > fe->ops.info.frequency_max_hz / kHz))
308 return -EINVAL;
309
310 /*
311 * alpha = 1.35 for dvb-s
312 * fBW = (alpha*symbolrate)/(2*0.8)
313 * 1.35 / (2*0.8) = 27 / 32
314 */
315 fbw = (27 * p->symbol_rate) / 32;
316
317 /* scale to kHz */
318 fbw /= 1000;
319
320 /* Add safe margin of 3MHz */
321 fbw += 3000;
322
323 /* setting the charge pump - guessed values */
324 if (frequency < 950000)
325 return -EINVAL;
326 else if (frequency < 1250000)
327 c = 0;
328 else if (frequency < 1750000)
329 c = 1;
330 else if (frequency < 2175000)
331 c = 2;
332 else
333 return -EINVAL;
334
335 if (fe->ops.i2c_gate_ctrl)
336 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
337
338 ret = zl10036_set_gain_params(state, c);
339 if (ret < 0)
340 goto error;
341
342 ret = zl10036_set_frequency(state, p->frequency);
343 if (ret < 0)
344 goto error;
345
346 ret = zl10036_set_bandwidth(state, fbw);
347 if (ret < 0)
348 goto error;
349
350 /* wait for tuner lock - no idea if this is really needed */
351 for (i = 0; i < 20; i++) {
352 ret = zl10036_read_status_reg(state);
353 if (ret < 0)
354 goto error;
355
356 /* check Frequency & Phase Lock Bit */
357 if (ret & STATUS_FL)
358 break;
359
360 msleep(10);
361 }
362
363 error:
364 if (fe->ops.i2c_gate_ctrl)
365 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
366
367 return ret;
368 }
369
zl10036_get_frequency(struct dvb_frontend * fe,u32 * frequency)370 static int zl10036_get_frequency(struct dvb_frontend *fe, u32 *frequency)
371 {
372 struct zl10036_state *state = fe->tuner_priv;
373
374 *frequency = state->frequency;
375
376 return 0;
377 }
378
zl10036_init_regs(struct zl10036_state * state)379 static int zl10036_init_regs(struct zl10036_state *state)
380 {
381 int ret;
382 int i;
383
384 /* could also be one block from reg 2 to 13 and additional 10/11 */
385 u8 zl10036_init_tab[][2] = {
386 { 0x04, 0x00 }, /* 2/3: div=0x400 - arbitrary value */
387 { 0x8b, _RDIV_REG }, /* 4/5: rfg=0 ba=1 bg=1 len=? */
388 /* p0=0 c=0 r=_RDIV_REG */
389 { 0xc0, 0x20 }, /* 6/7: rsd=0 bf=0x10 */
390 { 0xd3, 0x40 }, /* 8/9: from datasheet */
391 { 0xe3, 0x5b }, /* 10/11: lock window level */
392 { 0xf0, 0x28 }, /* 12/13: br=0xa clr=0 tl=0*/
393 { 0xe3, 0xf9 }, /* 10/11: unlock window level */
394 };
395
396 /* invalid values to trigger writing */
397 state->br = 0xff;
398 state->bf = 0xff;
399
400 if (!state->config->rf_loop_enable)
401 zl10036_init_tab[1][0] |= 0x01;
402
403 deb_info("%s\n", __func__);
404
405 for (i = 0; i < ARRAY_SIZE(zl10036_init_tab); i++) {
406 ret = zl10036_write(state, zl10036_init_tab[i], 2);
407 if (ret < 0)
408 return ret;
409 }
410
411 return 0;
412 }
413
zl10036_init(struct dvb_frontend * fe)414 static int zl10036_init(struct dvb_frontend *fe)
415 {
416 struct zl10036_state *state = fe->tuner_priv;
417 int ret = 0;
418
419 if (fe->ops.i2c_gate_ctrl)
420 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
421
422 ret = zl10036_read_status_reg(state);
423 if (ret < 0)
424 return ret;
425
426 /* Only init if Power-on-Reset bit is set? */
427 ret = zl10036_init_regs(state);
428
429 if (fe->ops.i2c_gate_ctrl)
430 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
431
432 return ret;
433 }
434
435 static const struct dvb_tuner_ops zl10036_tuner_ops = {
436 .info = {
437 .name = "Zarlink ZL10036",
438 .frequency_min_hz = 950 * MHz,
439 .frequency_max_hz = 2175 * MHz
440 },
441 .init = zl10036_init,
442 .release = zl10036_release,
443 .sleep = zl10036_sleep,
444 .set_params = zl10036_set_params,
445 .get_frequency = zl10036_get_frequency,
446 };
447
zl10036_attach(struct dvb_frontend * fe,const struct zl10036_config * config,struct i2c_adapter * i2c)448 struct dvb_frontend *zl10036_attach(struct dvb_frontend *fe,
449 const struct zl10036_config *config,
450 struct i2c_adapter *i2c)
451 {
452 struct zl10036_state *state;
453 int ret;
454
455 if (!config) {
456 printk(KERN_ERR "%s: no config specified", __func__);
457 return NULL;
458 }
459
460 state = kzalloc(sizeof(struct zl10036_state), GFP_KERNEL);
461 if (!state)
462 return NULL;
463
464 state->config = config;
465 state->i2c = i2c;
466
467 if (fe->ops.i2c_gate_ctrl)
468 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
469
470 ret = zl10036_read_status_reg(state);
471 if (ret < 0) {
472 printk(KERN_ERR "%s: No zl10036 found\n", __func__);
473 goto error;
474 }
475
476 ret = zl10036_init_regs(state);
477 if (ret < 0) {
478 printk(KERN_ERR "%s: tuner initialization failed\n",
479 __func__);
480 goto error;
481 }
482
483 if (fe->ops.i2c_gate_ctrl)
484 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
485
486 fe->tuner_priv = state;
487
488 memcpy(&fe->ops.tuner_ops, &zl10036_tuner_ops,
489 sizeof(struct dvb_tuner_ops));
490 printk(KERN_INFO "%s: tuner initialization (%s addr=0x%02x) ok\n",
491 __func__, fe->ops.tuner_ops.info.name, config->tuner_address);
492
493 return fe;
494
495 error:
496 kfree(state);
497 return NULL;
498 }
499 EXPORT_SYMBOL_GPL(zl10036_attach);
500
501 module_param_named(debug, zl10036_debug, int, 0644);
502 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
503 MODULE_DESCRIPTION("DVB ZL10036 driver");
504 MODULE_AUTHOR("Tino Reichardt");
505 MODULE_AUTHOR("Matthias Schwarzott");
506 MODULE_LICENSE("GPL");
507