summaryrefslogtreecommitdiff
path: root/drivers/media/dvb-frontends/s921.c
blob: 69862e1fd9e9d514e5e1f8ff927e2259b938880c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
/*
 *   Sharp VA3A5JZ921 One Seg Broadcast Module driver
 *   This device is labeled as just S. 921 at the top of the frontend can
 *
 *   Copyright (C) 2009-2010 Mauro Carvalho Chehab
 *   Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
 *
 *   Developed for Leadership SBTVD 1seg device sold in Brazil
 *
 *   Frontend module based on cx24123 driver, getting some info from
 *	the old s921 driver.
 *
 *   FIXME: Need to port to DVB v5.2 API
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License as
 *   published by the Free Software Foundation version 2.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   General Public License for more details.
 */

#include <linux/kernel.h>
#include <asm/div64.h>

#include "dvb_frontend.h"
#include "s921.h"

static int debug = 1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");

#define rc(args...)  do {						\
	printk(KERN_ERR  "s921: " args);				\
} while (0)

#define dprintk(args...)						\
	do {								\
		if (debug) {						\
			printk(KERN_DEBUG "s921: %s: ", __func__);	\
			printk(args);					\
		}							\
	} while (0)

struct s921_state {
	struct i2c_adapter *i2c;
	const struct s921_config *config;

	struct dvb_frontend frontend;

	/* The Demod can't easily provide these, we cache them */
	u32 currentfreq;
};

/*
 * Various tuner defaults need to be established for a given frequency kHz.
 * fixme: The bounds on the bands do not match the doc in real life.
 * fixme: Some of them have been moved, other might need adjustment.
 */
static struct s921_bandselect_val {
	u32 freq_low;
	u8  band_reg;
} s921_bandselect[] = {
	{         0, 0x7b },
	{ 485140000, 0x5b },
	{ 515140000, 0x3b },
	{ 545140000, 0x1b },
	{ 599140000, 0xfb },
	{ 623140000, 0xdb },
	{ 659140000, 0xbb },
	{ 713140000, 0x9b },
};

struct regdata {
	u8 reg;
	u8 data;
};

static struct regdata s921_init[] = {
	{ 0x01, 0x80 },		/* Probably, a reset sequence */
	{ 0x01, 0x40 },
	{ 0x01, 0x80 },
	{ 0x01, 0x40 },

	{ 0x02, 0x00 },
	{ 0x03, 0x40 },
	{ 0x04, 0x01 },
	{ 0x05, 0x00 },
	{ 0x06, 0x00 },
	{ 0x07, 0x00 },
	{ 0x08, 0x00 },
	{ 0x09, 0x00 },
	{ 0x0a, 0x00 },
	{ 0x0b, 0x5a },
	{ 0x0c, 0x00 },
	{ 0x0d, 0x00 },
	{ 0x0f, 0x00 },
	{ 0x13, 0x1b },
	{ 0x14, 0x80 },
	{ 0x15, 0x40 },
	{ 0x17, 0x70 },
	{ 0x18, 0x01 },
	{ 0x19, 0x12 },
	{ 0x1a, 0x01 },
	{ 0x1b, 0x12 },
	{ 0x1c, 0xa0 },
	{ 0x1d, 0x00 },
	{ 0x1e, 0x0a },
	{ 0x1f, 0x08 },
	{ 0x20, 0x40 },
	{ 0x21, 0xff },
	{ 0x22, 0x4c },
	{ 0x23, 0x4e },
	{ 0x24, 0x4c },
	{ 0x25, 0x00 },
	{ 0x26, 0x00 },
	{ 0x27, 0xf4 },
	{ 0x28, 0x60 },
	{ 0x29, 0x88 },
	{ 0x2a, 0x40 },
	{ 0x2b, 0x40 },
	{ 0x2c, 0xff },
	{ 0x2d, 0x00 },
	{ 0x2e, 0xff },
	{ 0x2f, 0x00 },
	{ 0x30, 0x20 },
	{ 0x31, 0x06 },
	{ 0x32, 0x0c },
	{ 0x34, 0x0f },
	{ 0x37, 0xfe },
	{ 0x38, 0x00 },
	{ 0x39, 0x63 },
	{ 0x3a, 0x10 },
	{ 0x3b, 0x10 },
	{ 0x47, 0x00 },
	{ 0x49, 0xe5 },
	{ 0x4b, 0x00 },
	{ 0x50, 0xc0 },
	{ 0x52, 0x20 },
	{ 0x54, 0x5a },
	{ 0x55, 0x5b },
	{ 0x56, 0x40 },
	{ 0x57, 0x70 },
	{ 0x5c, 0x50 },
	{ 0x5d, 0x00 },
	{ 0x62, 0x17 },
	{ 0x63, 0x2f },
	{ 0x64, 0x6f },
	{ 0x68, 0x00 },
	{ 0x69, 0x89 },
	{ 0x6a, 0x00 },
	{ 0x6b, 0x00 },
	{ 0x6c, 0x00 },
	{ 0x6d, 0x00 },
	{ 0x6e, 0x00 },
	{ 0x70, 0x10 },
	{ 0x71, 0x00 },
	{ 0x75, 0x00 },
	{ 0x76, 0x30 },
	{ 0x77, 0x01 },
	{ 0xaf, 0x00 },
	{ 0xb0, 0xa0 },
	{ 0xb2, 0x3d },
	{ 0xb3, 0x25 },
	{ 0xb4, 0x8b },
	{ 0xb5, 0x4b },
	{ 0xb6, 0x3f },
	{ 0xb7, 0xff },
	{ 0xb8, 0xff },
	{ 0xb9, 0xfc },
	{ 0xba, 0x00 },
	{ 0xbb, 0x00 },
	{ 0xbc, 0x00 },
	{ 0xd0, 0x30 },
	{ 0xe4, 0x84 },
	{ 0xf0, 0x48 },
	{ 0xf1, 0x19 },
	{ 0xf2, 0x5a },
	{ 0xf3, 0x8e },
	{ 0xf4, 0x2d },
	{ 0xf5, 0x07 },
	{ 0xf6, 0x5a },
	{ 0xf7, 0xba },
	{ 0xf8, 0xd7 },
};

static struct regdata s921_prefreq[] = {
	{ 0x47, 0x60 },
	{ 0x68, 0x00 },
	{ 0x69, 0x89 },
	{ 0xf0, 0x48 },
	{ 0xf1, 0x19 },
};

static struct regdata s921_postfreq[] = {
	{ 0xf5, 0xae },
	{ 0xf6, 0xb7 },
	{ 0xf7, 0xba },
	{ 0xf8, 0xd7 },
	{ 0x68, 0x0a },
	{ 0x69, 0x09 },
};

static int s921_i2c_writereg(struct s921_state *state,
			     u8 i2c_addr, int reg, int data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = {
		.addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
	};
	int rc;

	rc = i2c_transfer(state->i2c, &msg, 1);
	if (rc != 1) {
		printk("%s: writereg rcor(rc == %i, reg == 0x%02x,"
			 " data == 0x%02x)\n", __func__, rc, reg, data);
		return rc;
	}

	return 0;
}

static int s921_i2c_writeregdata(struct s921_state *state, u8 i2c_addr,
				 struct regdata *rd, int size)
{
	int i, rc;

	for (i = 0; i < size; i++) {
		rc = s921_i2c_writereg(state, i2c_addr, rd[i].reg, rd[i].data);
		if (rc < 0)
			return rc;
	}
	return 0;
}

static int s921_i2c_readreg(struct s921_state *state, u8 i2c_addr, u8 reg)
{
	u8 val;
	int rc;
	struct i2c_msg msg[] = {
		{ .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
		{ .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
	};

	rc = i2c_transfer(state->i2c, msg, 2);

	if (rc != 2) {
		rc("%s: reg=0x%x (rcor=%d)\n", __func__, reg, rc);
		return rc;
	}

	return val;
}

#define s921_readreg(state, reg) \
	s921_i2c_readreg(state, state->config->demod_address, reg)
#define s921_writereg(state, reg, val) \
	s921_i2c_writereg(state, state->config->demod_address, reg, val)
#define s921_writeregdata(state, regdata) \
	s921_i2c_writeregdata(state, state->config->demod_address, \
	regdata, ARRAY_SIZE(regdata))

static int s921_pll_tune(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct s921_state *state = fe->demodulator_priv;
	int band, rc, i;
	unsigned long f_offset;
	u8 f_switch;
	u64 offset;

	dprintk("frequency=%i\n", p->frequency);

	for (band = 0; band < ARRAY_SIZE(s921_bandselect); band++)
		if (p->frequency < s921_bandselect[band].freq_low)
			break;
	band--;

	if (band < 0) {
		rc("%s: frequency out of range\n", __func__);
		return -EINVAL;
	}

	f_switch = s921_bandselect[band].band_reg;

	offset = ((u64)p->frequency) * 258;
	do_div(offset, 6000000);
	f_offset = ((unsigned long)offset) + 2321;

	rc = s921_writeregdata(state, s921_prefreq);
	if (rc < 0)
		return rc;

	rc = s921_writereg(state, 0xf2, (f_offset >> 8) & 0xff);
	if (rc < 0)
		return rc;

	rc = s921_writereg(state, 0xf3, f_offset & 0xff);
	if (rc < 0)
		return rc;

	rc = s921_writereg(state, 0xf4, f_switch);
	if (rc < 0)
		return rc;

	rc = s921_writeregdata(state, s921_postfreq);
	if (rc < 0)
		return rc;

	for (i = 0 ; i < 6; i++) {
		rc = s921_readreg(state, 0x80);
		dprintk("status 0x80: %02x\n", rc);
	}
	rc = s921_writereg(state, 0x01, 0x40);
	if (rc < 0)
		return rc;

	rc = s921_readreg(state, 0x01);
	dprintk("status 0x01: %02x\n", rc);

	rc = s921_readreg(state, 0x80);
	dprintk("status 0x80: %02x\n", rc);

	rc = s921_readreg(state, 0x80);
	dprintk("status 0x80: %02x\n", rc);

	rc = s921_readreg(state, 0x32);
	dprintk("status 0x32: %02x\n", rc);

	dprintk("pll tune band=%d, pll=%d\n", f_switch, (int)f_offset);

	return 0;
}

static int s921_initfe(struct dvb_frontend *fe)
{
	struct s921_state *state = fe->demodulator_priv;
	int rc;

	dprintk("\n");

	rc = s921_writeregdata(state, s921_init);
	if (rc < 0)
		return rc;

	return 0;
}

static int s921_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct s921_state *state = fe->demodulator_priv;
	int regstatus, rc;

	*status = 0;

	rc = s921_readreg(state, 0x81);
	if (rc < 0)
		return rc;

	regstatus = rc << 8;

	rc = s921_readreg(state, 0x82);
	if (rc < 0)
		return rc;

	regstatus |= rc;

	dprintk("status = %04x\n", regstatus);

	/* Full Sync - We don't know what each bit means on regs 0x81/0x82 */
	if ((regstatus & 0xff) == 0x40) {
		*status = FE_HAS_SIGNAL  |
			  FE_HAS_CARRIER |
			  FE_HAS_VITERBI |
			  FE_HAS_SYNC    |
			  FE_HAS_LOCK;
	} else if (regstatus & 0x40) {
		/* This is close to Full Sync, but not enough to get useful info */
		*status = FE_HAS_SIGNAL  |
			  FE_HAS_CARRIER |
			  FE_HAS_VITERBI |
			  FE_HAS_SYNC;
	}

	return 0;
}

static int s921_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
	fe_status_t	status;
	struct s921_state *state = fe->demodulator_priv;
	int rc;

	/* FIXME: Use the proper register for it... 0x80? */
	rc = s921_read_status(fe, &status);
	if (rc < 0)
		return rc;

	*strength = (status & FE_HAS_LOCK) ? 0xffff : 0;

	dprintk("strength = 0x%04x\n", *strength);

	rc = s921_readreg(state, 0x01);
	dprintk("status 0x01: %02x\n", rc);

	rc = s921_readreg(state, 0x80);
	dprintk("status 0x80: %02x\n", rc);

	rc = s921_readreg(state, 0x32);
	dprintk("status 0x32: %02x\n", rc);

	return 0;
}

static int s921_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct s921_state *state = fe->demodulator_priv;
	int rc;

	dprintk("\n");

	/* FIXME: We don't know how to use non-auto mode */

	rc = s921_pll_tune(fe);
	if (rc < 0)
		return rc;

	state->currentfreq = p->frequency;

	return 0;
}

static int s921_get_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct s921_state *state = fe->demodulator_priv;

	/* FIXME: Probably it is possible to get it from regs f1 and f2 */
	p->frequency = state->currentfreq;
	p->delivery_system = SYS_ISDBT;

	return 0;
}

static int s921_tune(struct dvb_frontend *fe,
			bool re_tune,
			unsigned int mode_flags,
			unsigned int *delay,
			fe_status_t *status)
{
	int rc = 0;

	dprintk("\n");

	if (re_tune)
		rc = s921_set_frontend(fe);

	if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
		s921_read_status(fe, status);

	return rc;
}

static int s921_get_algo(struct dvb_frontend *fe)
{
	return 1; /* FE_ALGO_HW */
}

static void s921_release(struct dvb_frontend *fe)
{
	struct s921_state *state = fe->demodulator_priv;

	dprintk("\n");
	kfree(state);
}

static struct dvb_frontend_ops s921_ops;

struct dvb_frontend *s921_attach(const struct s921_config *config,
				    struct i2c_adapter *i2c)
{
	/* allocate memory for the internal state */
	struct s921_state *state =
		kzalloc(sizeof(struct s921_state), GFP_KERNEL);

	dprintk("\n");
	if (!state) {
		rc("Unable to kzalloc\n");
		return NULL;
	}

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &s921_ops,
		sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	return &state->frontend;
}
EXPORT_SYMBOL(s921_attach);

static struct dvb_frontend_ops s921_ops = {
	.delsys = { SYS_ISDBT },
	/* Use dib8000 values per default */
	.info = {
		.name = "Sharp S921",
		.frequency_min = 470000000,
		/*
		 * Max should be 770MHz instead, according with Sharp docs,
		 * but Leadership doc says it works up to 806 MHz. This is
		 * required to get channel 69, used in Brazil
		 */
		.frequency_max = 806000000,
		.frequency_tolerance = 0,
		 .caps = FE_CAN_INVERSION_AUTO |
			 FE_CAN_FEC_1_2  | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			 FE_CAN_FEC_5_6  | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
			 FE_CAN_QPSK     | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
			 FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
			 FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_RECOVER |
			 FE_CAN_HIERARCHY_AUTO,
	},

	.release = s921_release,

	.init = s921_initfe,
	.set_frontend = s921_set_frontend,
	.get_frontend = s921_get_frontend,
	.read_status = s921_read_status,
	.read_signal_strength = s921_read_signal_strength,
	.tune = s921_tune,
	.get_frontend_algo = s921_get_algo,
};

MODULE_DESCRIPTION("DVB Frontend module for Sharp S921 hardware");
MODULE_AUTHOR("Mauro Carvalho Chehab");
MODULE_AUTHOR("Douglas Landgraf <dougsland@redhat.com>");
MODULE_LICENSE("GPL");