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sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / media / dvb-frontends / stb6100.c
blob4ef8a5c7003e907c2836e3ad77f6306fbafe1576
1 /*
2 STB6100 Silicon Tuner
3 Copyright (C) Manu Abraham (abraham.manu@gmail.com)
4
5 Copyright (C) ST Microelectronics
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27
28 #include "dvb_frontend.h"
29 #include "stb6100.h"
30
31 static unsigned int verbose;
32 module_param(verbose, int, 0644);
33
34 /* Max transfer size done by I2C transfer functions */
35 #define MAX_XFER_SIZE 64
36
37 #define FE_ERROR 0
38 #define FE_NOTICE 1
39 #define FE_INFO 2
40 #define FE_DEBUG 3
41
42 #define dprintk(x, y, z, format, arg...) do { \
43 if (z) { \
44 if ((x > FE_ERROR) && (x > y)) \
45 printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \
46 else if ((x > FE_NOTICE) && (x > y)) \
47 printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \
48 else if ((x > FE_INFO) && (x > y)) \
49 printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \
50 else if ((x > FE_DEBUG) && (x > y)) \
51 printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \
52 } else { \
53 if (x > y) \
54 printk(format, ##arg); \
55 } \
56 } while (0)
57
58 struct stb6100_lkup {
59 u32 val_low;
60 u32 val_high;
61 u8 reg;
62 };
63
64 static int stb6100_release(struct dvb_frontend *fe);
65
66 static const struct stb6100_lkup lkup[] = {
67 { 0, 950000, 0x0a },
68 { 950000, 1000000, 0x0a },
69 { 1000000, 1075000, 0x0c },
70 { 1075000, 1200000, 0x00 },
71 { 1200000, 1300000, 0x01 },
72 { 1300000, 1370000, 0x02 },
73 { 1370000, 1470000, 0x04 },
74 { 1470000, 1530000, 0x05 },
75 { 1530000, 1650000, 0x06 },
76 { 1650000, 1800000, 0x08 },
77 { 1800000, 1950000, 0x0a },
78 { 1950000, 2150000, 0x0c },
79 { 2150000, 9999999, 0x0c },
80 { 0, 0, 0x00 }
81 };
82
83 /* Register names for easy debugging. */
84 static const char *stb6100_regnames[] = {
85 [STB6100_LD] = "LD",
86 [STB6100_VCO] = "VCO",
87 [STB6100_NI] = "NI",
88 [STB6100_NF_LSB] = "NF",
89 [STB6100_K] = "K",
90 [STB6100_G] = "G",
91 [STB6100_F] = "F",
92 [STB6100_DLB] = "DLB",
93 [STB6100_TEST1] = "TEST1",
94 [STB6100_FCCK] = "FCCK",
95 [STB6100_LPEN] = "LPEN",
96 [STB6100_TEST3] = "TEST3",
97 };
98
99 /* Template for normalisation, i.e. setting unused or undocumented
100 * bits as required according to the documentation.
101 */
102 struct stb6100_regmask {
103 u8 mask;
104 u8 set;
105 };
106
107 static const struct stb6100_regmask stb6100_template[] = {
108 [STB6100_LD] = { 0xff, 0x00 },
109 [STB6100_VCO] = { 0xff, 0x00 },
110 [STB6100_NI] = { 0xff, 0x00 },
111 [STB6100_NF_LSB] = { 0xff, 0x00 },
112 [STB6100_K] = { 0xc7, 0x38 },
113 [STB6100_G] = { 0xef, 0x10 },
114 [STB6100_F] = { 0x1f, 0xc0 },
115 [STB6100_DLB] = { 0x38, 0xc4 },
116 [STB6100_TEST1] = { 0x00, 0x8f },
117 [STB6100_FCCK] = { 0x40, 0x0d },
118 [STB6100_LPEN] = { 0xf0, 0x0b },
119 [STB6100_TEST3] = { 0x00, 0xde },
120 };
121
122 /*
123 * Currently unused. Some boards might need it in the future
124 */
125 static inline void stb6100_normalise_regs(u8 regs[])
126 {
127 int i;
128
129 for (i = 0; i < STB6100_NUMREGS; i++)
130 regs[i] = (regs[i] & stb6100_template[i].mask) | stb6100_template[i].set;
131 }
132
133 static int stb6100_read_regs(struct stb6100_state *state, u8 regs[])
134 {
135 int rc;
136 struct i2c_msg msg = {
137 .addr = state->config->tuner_address,
138 .flags = I2C_M_RD,
139 .buf = regs,
140 .len = STB6100_NUMREGS
141 };
142
143 rc = i2c_transfer(state->i2c, &msg, 1);
144 if (unlikely(rc != 1)) {
145 dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]",
146 state->config->tuner_address, rc);
147
148 return -EREMOTEIO;
149 }
150 if (unlikely(verbose > FE_DEBUG)) {
151 int i;
152
153 dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address);
154 for (i = 0; i < STB6100_NUMREGS; i++)
155 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[i], regs[i]);
156 }
157 return 0;
158 }
159
160 static int stb6100_read_reg(struct stb6100_state *state, u8 reg)
161 {
162 u8 regs[STB6100_NUMREGS];
163
164 struct i2c_msg msg = {
165 .addr = state->config->tuner_address + reg,
166 .flags = I2C_M_RD,
167 .buf = regs,
168 .len = 1
169 };
170
171 i2c_transfer(state->i2c, &msg, 1);
172
173 if (unlikely(reg >= STB6100_NUMREGS)) {
174 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
175 return -EINVAL;
176 }
177 if (unlikely(verbose > FE_DEBUG)) {
178 dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address);
179 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[reg], regs[0]);
180 }
181
182 return (unsigned int)regs[0];
183 }
184
185 static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len)
186 {
187 int rc;
188 u8 cmdbuf[MAX_XFER_SIZE];
189 struct i2c_msg msg = {
190 .addr = state->config->tuner_address,
191 .flags = 0,
192 .buf = cmdbuf,
193 .len = len + 1
194 };
195
196 if (1 + len > sizeof(cmdbuf)) {
197 printk(KERN_WARNING
198 "%s: i2c wr: len=%d is too big!\n",
199 KBUILD_MODNAME, len);
200 return -EINVAL;
201 }
202
203 if (unlikely(start < 1 || start + len > STB6100_NUMREGS)) {
204 dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d",
205 start, len);
206 return -EINVAL;
207 }
208 memcpy(&cmdbuf[1], buf, len);
209 cmdbuf[0] = start;
210
211 if (unlikely(verbose > FE_DEBUG)) {
212 int i;
213
214 dprintk(verbose, FE_DEBUG, 1, " Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len);
215 for (i = 0; i < len; i++)
216 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[start + i], buf[i]);
217 }
218 rc = i2c_transfer(state->i2c, &msg, 1);
219 if (unlikely(rc != 1)) {
220 dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]",
221 (unsigned int)state->config->tuner_address, start, len, rc);
222 return -EREMOTEIO;
223 }
224 return 0;
225 }
226
227 static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
228 {
229 if (unlikely(reg >= STB6100_NUMREGS)) {
230 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
231 return -EREMOTEIO;
232 }
233 data = (data & stb6100_template[reg].mask) | stb6100_template[reg].set;
234 return stb6100_write_reg_range(state, &data, reg, 1);
235 }
236
237
238 static int stb6100_get_status(struct dvb_frontend *fe, u32 *status)
239 {
240 int rc;
241 struct stb6100_state *state = fe->tuner_priv;
242
243 rc = stb6100_read_reg(state, STB6100_LD);
244 if (rc < 0) {
245 dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
246 return rc;
247 }
248 return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
249 }
250
251 static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
252 {
253 int rc;
254 u8 f;
255 struct stb6100_state *state = fe->tuner_priv;
256
257 rc = stb6100_read_reg(state, STB6100_F);
258 if (rc < 0)
259 return rc;
260 f = rc & STB6100_F_F;
261
262 state->status.bandwidth = (f + 5) * 2000; /* x2 for ZIF */
263
264 *bandwidth = state->bandwidth = state->status.bandwidth * 1000;
265 dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
266 return 0;
267 }
268
269 static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
270 {
271 u32 tmp;
272 int rc;
273 struct stb6100_state *state = fe->tuner_priv;
274
275 dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);
276
277 bandwidth /= 2; /* ZIF */
278
279 if (bandwidth >= 36000000) /* F[4:0] BW/2 max =31+5=36 mhz for F=31 */
280 tmp = 31;
281 else if (bandwidth <= 5000000) /* bw/2 min = 5Mhz for F=0 */
282 tmp = 0;
283 else /* if 5 < bw/2 < 36 */
284 tmp = (bandwidth + 500000) / 1000000 - 5;
285
286 /* Turn on LPF bandwidth setting clock control,
287 * set bandwidth, wait 10ms, turn off.
288 */
289 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK);
290 if (rc < 0)
291 return rc;
292 rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp);
293 if (rc < 0)
294 return rc;
295
296 msleep(5); /* This is dangerous as another (related) thread may start */
297
298 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
299 if (rc < 0)
300 return rc;
301
302 msleep(10); /* This is dangerous as another (related) thread may start */
303
304 return 0;
305 }
306
307 static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
308 {
309 int rc;
310 u32 nint, nfrac, fvco;
311 int psd2, odiv;
312 struct stb6100_state *state = fe->tuner_priv;
313 u8 regs[STB6100_NUMREGS];
314
315 rc = stb6100_read_regs(state, regs);
316 if (rc < 0)
317 return rc;
318
319 odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
320 psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
321 nint = regs[STB6100_NI];
322 nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
323 fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
324 *frequency = state->frequency = fvco >> (odiv + 1);
325
326 dprintk(verbose, FE_DEBUG, 1,
327 "frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
328 state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac);
329 return 0;
330 }
331
332
333 static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
334 {
335 int rc;
336 const struct stb6100_lkup *ptr;
337 struct stb6100_state *state = fe->tuner_priv;
338 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
339
340 u32 srate = 0, fvco, nint, nfrac;
341 u8 regs[STB6100_NUMREGS];
342 u8 g, psd2, odiv;
343
344 dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");
345
346 if (fe->ops.get_frontend) {
347 dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
348 fe->ops.get_frontend(fe);
349 }
350 srate = p->symbol_rate;
351
352 /* Set up tuner cleanly, LPF calibration on */
353 rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK);
354 if (rc < 0)
355 return rc; /* allow LPF calibration */
356
357 /* PLL Loop disabled, bias on, VCO on, synth on */
358 regs[STB6100_LPEN] = 0xeb;
359 rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
360 if (rc < 0)
361 return rc;
362
363 /* Program the registers with their data values */
364
365 /* VCO divide ratio (LO divide ratio, VCO prescaler enable). */
366 if (frequency <= 1075000)
367 odiv = 1;
368 else
369 odiv = 0;
370
371 /* VCO enabled, search clock off as per LL3.7, 3.4.1 */
372 regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT);
373
374 /* OSM */
375 for (ptr = lkup;
376 (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
377 ptr++);
378
379 if (ptr->val_high == 0) {
380 printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
381 return -EINVAL;
382 }
383 regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg;
384 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
385 if (rc < 0)
386 return rc;
387
388 if ((frequency > 1075000) && (frequency <= 1325000))
389 psd2 = 0;
390 else
391 psd2 = 1;
392 /* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4) */
393 fvco = frequency << (1 + odiv);
394 /* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1))) */
395 nint = fvco / (state->reference << psd2);
396 /* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9 */
397 nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
398 << (9 - psd2), state->reference);
399
400 /* NI */
401 regs[STB6100_NI] = nint;
402 rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
403 if (rc < 0)
404 return rc;
405
406 /* NF */
407 regs[STB6100_NF_LSB] = nfrac;
408 rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
409 if (rc < 0)
410 return rc;
411
412 /* K */
413 regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT);
414 regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
415 rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
416 if (rc < 0)
417 return rc;
418
419 /* G Baseband gain. */
420 if (srate >= 15000000)
421 g = 9; /* +4 dB */
422 else if (srate >= 5000000)
423 g = 11; /* +8 dB */
424 else
425 g = 14; /* +14 dB */
426
427 regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g;
428 regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
429 regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */
430 rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
431 if (rc < 0)
432 return rc;
433
434 /* F we don't write as it is set up in BW set */
435
436 /* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
437 regs[STB6100_DLB] = 0xcc;
438 rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
439 if (rc < 0)
440 return rc;
441
442 dprintk(verbose, FE_DEBUG, 1,
443 "frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
444 frequency, srate, (unsigned int)g, (unsigned int)odiv,
445 (unsigned int)psd2, state->reference,
446 ptr->reg, fvco, nint, nfrac);
447
448 /* Set up the test registers */
449 regs[STB6100_TEST1] = 0x8f;
450 rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
451 if (rc < 0)
452 return rc;
453 regs[STB6100_TEST3] = 0xde;
454 rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
455 if (rc < 0)
456 return rc;
457
458 /* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
459 regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
460 rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
461 if (rc < 0)
462 return rc;
463
464 msleep(2);
465
466 /* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
467 regs[STB6100_VCO] &= ~STB6100_VCO_OCK; /* VCO fast search */
468 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
469 if (rc < 0)
470 return rc;
471
472 msleep(10); /* This is dangerous as another (related) thread may start */ /* wait for LO to lock */
473
474 regs[STB6100_VCO] &= ~STB6100_VCO_OSCH; /* vco search disabled */
475 regs[STB6100_VCO] |= STB6100_VCO_OCK; /* search clock off */
476 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
477 if (rc < 0)
478 return rc;
479
480 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
481 if (rc < 0)
482 return rc; /* Stop LPF calibration */
483
484 msleep(10); /* This is dangerous as another (related) thread may start */
485 /* wait for stabilisation, (should not be necessary) */
486 return 0;
487 }
488
489 static int stb6100_sleep(struct dvb_frontend *fe)
490 {
491 /* TODO: power down */
492 return 0;
493 }
494
495 static int stb6100_init(struct dvb_frontend *fe)
496 {
497 struct stb6100_state *state = fe->tuner_priv;
498 struct tuner_state *status = &state->status;
499
500 status->tunerstep = 125000;
501 status->ifreq = 0;
502 status->refclock = 27000000; /* Hz */
503 status->iqsense = 1;
504 status->bandwidth = 36000; /* kHz */
505 state->bandwidth = status->bandwidth * 1000; /* Hz */
506 state->reference = status->refclock / 1000; /* kHz */
507
508 /* Set default bandwidth. Modified, PN 13-May-10 */
509 return 0;
510 }
511
512 static int stb6100_get_state(struct dvb_frontend *fe,
513 enum tuner_param param,
514 struct tuner_state *state)
515 {
516 switch (param) {
517 case DVBFE_TUNER_FREQUENCY:
518 stb6100_get_frequency(fe, &state->frequency);
519 break;
520 case DVBFE_TUNER_TUNERSTEP:
521 break;
522 case DVBFE_TUNER_IFFREQ:
523 break;
524 case DVBFE_TUNER_BANDWIDTH:
525 stb6100_get_bandwidth(fe, &state->bandwidth);
526 break;
527 case DVBFE_TUNER_REFCLOCK:
528 break;
529 default:
530 break;
531 }
532
533 return 0;
534 }
535
536 static int stb6100_set_state(struct dvb_frontend *fe,
537 enum tuner_param param,
538 struct tuner_state *state)
539 {
540 struct stb6100_state *tstate = fe->tuner_priv;
541
542 switch (param) {
543 case DVBFE_TUNER_FREQUENCY:
544 stb6100_set_frequency(fe, state->frequency);
545 tstate->frequency = state->frequency;
546 break;
547 case DVBFE_TUNER_TUNERSTEP:
548 break;
549 case DVBFE_TUNER_IFFREQ:
550 break;
551 case DVBFE_TUNER_BANDWIDTH:
552 stb6100_set_bandwidth(fe, state->bandwidth);
553 tstate->bandwidth = state->bandwidth;
554 break;
555 case DVBFE_TUNER_REFCLOCK:
556 break;
557 default:
558 break;
559 }
560
561 return 0;
562 }
563
564 static struct dvb_tuner_ops stb6100_ops = {
565 .info = {
566 .name = "STB6100 Silicon Tuner",
567 .frequency_min = 950000,
568 .frequency_max = 2150000,
569 .frequency_step = 0,
570 },
571
572 .init = stb6100_init,
573 .sleep = stb6100_sleep,
574 .get_status = stb6100_get_status,
575 .get_state = stb6100_get_state,
576 .set_state = stb6100_set_state,
577 .release = stb6100_release
578 };
579
580 struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe,
581 const struct stb6100_config *config,
582 struct i2c_adapter *i2c)
583 {
584 struct stb6100_state *state = NULL;
585
586 state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
587 if (!state)
588 return NULL;
589
590 state->config = config;
591 state->i2c = i2c;
592 state->frontend = fe;
593 state->reference = config->refclock / 1000; /* kHz */
594 fe->tuner_priv = state;
595 fe->ops.tuner_ops = stb6100_ops;
596
597 printk("%s: Attaching STB6100 \n", __func__);
598 return fe;
599 }
600
601 static int stb6100_release(struct dvb_frontend *fe)
602 {
603 struct stb6100_state *state = fe->tuner_priv;
604
605 fe->tuner_priv = NULL;
606 kfree(state);
607
608 return 0;
609 }
610
611 EXPORT_SYMBOL(stb6100_attach);
612 MODULE_PARM_DESC(verbose, "Set Verbosity level");
613
614 MODULE_AUTHOR("Manu Abraham");
615 MODULE_DESCRIPTION("STB6100 Silicon tuner");
616 MODULE_LICENSE("GPL");
Linux with added FPC-III support