1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *    Support for OR51211 (pcHDTV HD-2000) - VSB
4  *
5  *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
6  *
7  *    Based on code from Jack Kelliher (kelliher@xmission.com)
8  *                           Copyright (C) 2002 & pcHDTV, inc.
9 */
10 
11 #define pr_fmt(fmt)	KBUILD_MODNAME ": %s: " fmt, __func__
12 
13 /*
14  * This driver needs external firmware. Please use the command
15  * "<kerneldir>/scripts/get_dvb_firmware or51211" to
16  * download/extract it, and then copy it to /usr/lib/hotplug/firmware
17  * or /lib/firmware (depending on configuration of firmware hotplug).
18  */
19 #define OR51211_DEFAULT_FIRMWARE "dvb-fe-or51211.fw"
20 
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/device.h>
24 #include <linux/firmware.h>
25 #include <linux/string.h>
26 #include <linux/slab.h>
27 #include <asm/byteorder.h>
28 
29 #include <linux/int_log.h>
30 #include <media/dvb_frontend.h>
31 #include "or51211.h"
32 
33 static int debug;
34 #define dprintk(args...) \
35 	do { if (debug) pr_debug(args); } while (0)
36 
37 static u8 run_buf[] = {0x7f,0x01};
38 static u8 cmd_buf[] = {0x04,0x01,0x50,0x80,0x06}; // ATSC
39 
40 struct or51211_state {
41 
42 	struct i2c_adapter* i2c;
43 
44 	/* Configuration settings */
45 	const struct or51211_config* config;
46 
47 	struct dvb_frontend frontend;
48 	struct bt878* bt;
49 
50 	/* Demodulator private data */
51 	u8 initialized:1;
52 	u32 snr; /* Result of last SNR calculation */
53 
54 	/* Tuner private data */
55 	u32 current_frequency;
56 };
57 
i2c_writebytes(struct or51211_state * state,u8 reg,const u8 * buf,int len)58 static int i2c_writebytes (struct or51211_state* state, u8 reg, const u8 *buf,
59 			   int len)
60 {
61 	int err;
62 	struct i2c_msg msg;
63 	msg.addr	= reg;
64 	msg.flags	= 0;
65 	msg.len		= len;
66 	msg.buf		= (u8 *)buf;
67 
68 	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
69 		pr_warn("error (addr %02x, err == %i)\n", reg, err);
70 		return -EREMOTEIO;
71 	}
72 
73 	return 0;
74 }
75 
i2c_readbytes(struct or51211_state * state,u8 reg,u8 * buf,int len)76 static int i2c_readbytes(struct or51211_state *state, u8 reg, u8 *buf, int len)
77 {
78 	int err;
79 	struct i2c_msg msg;
80 	msg.addr	= reg;
81 	msg.flags	= I2C_M_RD;
82 	msg.len		= len;
83 	msg.buf		= buf;
84 
85 	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
86 		pr_warn("error (addr %02x, err == %i)\n", reg, err);
87 		return -EREMOTEIO;
88 	}
89 
90 	return 0;
91 }
92 
or51211_load_firmware(struct dvb_frontend * fe,const struct firmware * fw)93 static int or51211_load_firmware (struct dvb_frontend* fe,
94 				  const struct firmware *fw)
95 {
96 	struct or51211_state* state = fe->demodulator_priv;
97 	u8 tudata[585];
98 	int i;
99 
100 	dprintk("Firmware is %zu bytes\n", fw->size);
101 
102 	/* Get eprom data */
103 	tudata[0] = 17;
104 	if (i2c_writebytes(state,0x50,tudata,1)) {
105 		pr_warn("error eprom addr\n");
106 		return -1;
107 	}
108 	if (i2c_readbytes(state,0x50,&tudata[145],192)) {
109 		pr_warn("error eprom\n");
110 		return -1;
111 	}
112 
113 	/* Create firmware buffer */
114 	for (i = 0; i < 145; i++)
115 		tudata[i] = fw->data[i];
116 
117 	for (i = 0; i < 248; i++)
118 		tudata[i+337] = fw->data[145+i];
119 
120 	state->config->reset(fe);
121 
122 	if (i2c_writebytes(state,state->config->demod_address,tudata,585)) {
123 		pr_warn("error 1\n");
124 		return -1;
125 	}
126 	msleep(1);
127 
128 	if (i2c_writebytes(state,state->config->demod_address,
129 			   &fw->data[393],8125)) {
130 		pr_warn("error 2\n");
131 		return -1;
132 	}
133 	msleep(1);
134 
135 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
136 		pr_warn("error 3\n");
137 		return -1;
138 	}
139 
140 	/* Wait at least 5 msec */
141 	msleep(10);
142 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
143 		pr_warn("error 4\n");
144 		return -1;
145 	}
146 	msleep(10);
147 
148 	pr_info("Done.\n");
149 	return 0;
150 };
151 
or51211_setmode(struct dvb_frontend * fe,int mode)152 static int or51211_setmode(struct dvb_frontend* fe, int mode)
153 {
154 	struct or51211_state* state = fe->demodulator_priv;
155 	u8 rec_buf[14];
156 
157 	state->config->setmode(fe, mode);
158 
159 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
160 		pr_warn("error 1\n");
161 		return -1;
162 	}
163 
164 	/* Wait at least 5 msec */
165 	msleep(10);
166 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
167 		pr_warn("error 2\n");
168 		return -1;
169 	}
170 
171 	msleep(10);
172 
173 	/* Set operation mode in Receiver 1 register;
174 	 * type 1:
175 	 * data 0x50h  Automatic sets receiver channel conditions
176 	 *             Automatic NTSC rejection filter
177 	 *             Enable  MPEG serial data output
178 	 *             MPEG2tr
179 	 *             High tuner phase noise
180 	 *             normal +/-150kHz Carrier acquisition range
181 	 */
182 	if (i2c_writebytes(state,state->config->demod_address,cmd_buf,3)) {
183 		pr_warn("error 3\n");
184 		return -1;
185 	}
186 
187 	rec_buf[0] = 0x04;
188 	rec_buf[1] = 0x00;
189 	rec_buf[2] = 0x03;
190 	rec_buf[3] = 0x00;
191 	msleep(20);
192 	if (i2c_writebytes(state,state->config->demod_address,rec_buf,3)) {
193 		pr_warn("error 5\n");
194 	}
195 	msleep(3);
196 	if (i2c_readbytes(state,state->config->demod_address,&rec_buf[10],2)) {
197 		pr_warn("error 6\n");
198 		return -1;
199 	}
200 	dprintk("rec status %02x %02x\n", rec_buf[10], rec_buf[11]);
201 
202 	return 0;
203 }
204 
or51211_set_parameters(struct dvb_frontend * fe)205 static int or51211_set_parameters(struct dvb_frontend *fe)
206 {
207 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
208 	struct or51211_state* state = fe->demodulator_priv;
209 
210 	/* Change only if we are actually changing the channel */
211 	if (state->current_frequency != p->frequency) {
212 		if (fe->ops.tuner_ops.set_params) {
213 			fe->ops.tuner_ops.set_params(fe);
214 			if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
215 		}
216 
217 		/* Set to ATSC mode */
218 		or51211_setmode(fe,0);
219 
220 		/* Update current frequency */
221 		state->current_frequency = p->frequency;
222 	}
223 	return 0;
224 }
225 
or51211_read_status(struct dvb_frontend * fe,enum fe_status * status)226 static int or51211_read_status(struct dvb_frontend *fe, enum fe_status *status)
227 {
228 	struct or51211_state* state = fe->demodulator_priv;
229 	unsigned char rec_buf[2];
230 	unsigned char snd_buf[] = {0x04,0x00,0x03,0x00};
231 	*status = 0;
232 
233 	/* Receiver Status */
234 	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
235 		pr_warn("write error\n");
236 		return -1;
237 	}
238 	msleep(3);
239 	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
240 		pr_warn("read error\n");
241 		return -1;
242 	}
243 	dprintk("%x %x\n", rec_buf[0], rec_buf[1]);
244 
245 	if (rec_buf[0] &  0x01) { /* Receiver Lock */
246 		*status |= FE_HAS_SIGNAL;
247 		*status |= FE_HAS_CARRIER;
248 		*status |= FE_HAS_VITERBI;
249 		*status |= FE_HAS_SYNC;
250 		*status |= FE_HAS_LOCK;
251 	}
252 	return 0;
253 }
254 
255 /* Calculate SNR estimation (scaled by 2^24)
256 
257    8-VSB SNR equation from Oren datasheets
258 
259    For 8-VSB:
260      SNR[dB] = 10 * log10(219037.9454 / MSE^2 )
261 
262    We re-write the snr equation as:
263      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
264    Where for 8-VSB, c = log10(219037.9454) * 2^24 */
265 
calculate_snr(u32 mse,u32 c)266 static u32 calculate_snr(u32 mse, u32 c)
267 {
268 	if (mse == 0) /* No signal */
269 		return 0;
270 
271 	mse = 2*intlog10(mse);
272 	if (mse > c) {
273 		/* Negative SNR, which is possible, but realisticly the
274 		demod will lose lock before the signal gets this bad.  The
275 		API only allows for unsigned values, so just return 0 */
276 		return 0;
277 	}
278 	return 10*(c - mse);
279 }
280 
or51211_read_snr(struct dvb_frontend * fe,u16 * snr)281 static int or51211_read_snr(struct dvb_frontend* fe, u16* snr)
282 {
283 	struct or51211_state* state = fe->demodulator_priv;
284 	u8 rec_buf[2];
285 	u8 snd_buf[3];
286 
287 	/* SNR after Equalizer */
288 	snd_buf[0] = 0x04;
289 	snd_buf[1] = 0x00;
290 	snd_buf[2] = 0x04;
291 
292 	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
293 		pr_warn("error writing snr reg\n");
294 		return -1;
295 	}
296 	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
297 		pr_warn("read_status read error\n");
298 		return -1;
299 	}
300 
301 	state->snr = calculate_snr(rec_buf[0], 89599047);
302 	*snr = (state->snr) >> 16;
303 
304 	dprintk("noise = 0x%02x, snr = %d.%02d dB\n", rec_buf[0],
305 		state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
306 
307 	return 0;
308 }
309 
or51211_read_signal_strength(struct dvb_frontend * fe,u16 * strength)310 static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
311 {
312 	/* Calculate Strength from SNR up to 35dB */
313 	/* Even though the SNR can go higher than 35dB, there is some comfort */
314 	/* factor in having a range of strong signals that can show at 100%   */
315 	struct or51211_state* state = (struct or51211_state*)fe->demodulator_priv;
316 	u16 snr;
317 	int ret;
318 
319 	ret = fe->ops.read_snr(fe, &snr);
320 	if (ret != 0)
321 		return ret;
322 	/* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
323 	/* scale the range 0 - 35*2^24 into 0 - 65535 */
324 	if (state->snr >= 8960 * 0x10000)
325 		*strength = 0xffff;
326 	else
327 		*strength = state->snr / 8960;
328 
329 	return 0;
330 }
331 
or51211_read_ber(struct dvb_frontend * fe,u32 * ber)332 static int or51211_read_ber(struct dvb_frontend* fe, u32* ber)
333 {
334 	*ber = -ENOSYS;
335 	return 0;
336 }
337 
or51211_read_ucblocks(struct dvb_frontend * fe,u32 * ucblocks)338 static int or51211_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
339 {
340 	*ucblocks = -ENOSYS;
341 	return 0;
342 }
343 
or51211_sleep(struct dvb_frontend * fe)344 static int or51211_sleep(struct dvb_frontend* fe)
345 {
346 	return 0;
347 }
348 
or51211_init(struct dvb_frontend * fe)349 static int or51211_init(struct dvb_frontend* fe)
350 {
351 	struct or51211_state* state = fe->demodulator_priv;
352 	const struct or51211_config* config = state->config;
353 	const struct firmware* fw;
354 	unsigned char get_ver_buf[] = {0x04,0x00,0x30,0x00,0x00};
355 	unsigned char rec_buf[14];
356 	int ret,i;
357 
358 	if (!state->initialized) {
359 		/* Request the firmware, this will block until it uploads */
360 		pr_info("Waiting for firmware upload (%s)...\n",
361 			OR51211_DEFAULT_FIRMWARE);
362 		ret = config->request_firmware(fe, &fw,
363 					       OR51211_DEFAULT_FIRMWARE);
364 		pr_info("Got Hotplug firmware\n");
365 		if (ret) {
366 			pr_warn("No firmware uploaded (timeout or file not found?)\n");
367 			return ret;
368 		}
369 
370 		ret = or51211_load_firmware(fe, fw);
371 		release_firmware(fw);
372 		if (ret) {
373 			pr_warn("Writing firmware to device failed!\n");
374 			return ret;
375 		}
376 		pr_info("Firmware upload complete.\n");
377 
378 		/* Set operation mode in Receiver 1 register;
379 		 * type 1:
380 		 * data 0x50h  Automatic sets receiver channel conditions
381 		 *             Automatic NTSC rejection filter
382 		 *             Enable  MPEG serial data output
383 		 *             MPEG2tr
384 		 *             High tuner phase noise
385 		 *             normal +/-150kHz Carrier acquisition range
386 		 */
387 		if (i2c_writebytes(state,state->config->demod_address,
388 				   cmd_buf,3)) {
389 			pr_warn("Load DVR Error 5\n");
390 			return -1;
391 		}
392 
393 		/* Read back ucode version to besure we loaded correctly */
394 		/* and are really up and running */
395 		rec_buf[0] = 0x04;
396 		rec_buf[1] = 0x00;
397 		rec_buf[2] = 0x03;
398 		rec_buf[3] = 0x00;
399 		msleep(30);
400 		if (i2c_writebytes(state,state->config->demod_address,
401 				   rec_buf,3)) {
402 			pr_warn("Load DVR Error A\n");
403 			return -1;
404 		}
405 		msleep(3);
406 		if (i2c_readbytes(state,state->config->demod_address,
407 				  &rec_buf[10],2)) {
408 			pr_warn("Load DVR Error B\n");
409 			return -1;
410 		}
411 
412 		rec_buf[0] = 0x04;
413 		rec_buf[1] = 0x00;
414 		rec_buf[2] = 0x01;
415 		rec_buf[3] = 0x00;
416 		msleep(20);
417 		if (i2c_writebytes(state,state->config->demod_address,
418 				   rec_buf,3)) {
419 			pr_warn("Load DVR Error C\n");
420 			return -1;
421 		}
422 		msleep(3);
423 		if (i2c_readbytes(state,state->config->demod_address,
424 				  &rec_buf[12],2)) {
425 			pr_warn("Load DVR Error D\n");
426 			return -1;
427 		}
428 
429 		for (i = 0; i < 8; i++)
430 			rec_buf[i]=0xed;
431 
432 		for (i = 0; i < 5; i++) {
433 			msleep(30);
434 			get_ver_buf[4] = i+1;
435 			if (i2c_writebytes(state,state->config->demod_address,
436 					   get_ver_buf,5)) {
437 				pr_warn("Load DVR Error 6 - %d\n", i);
438 				return -1;
439 			}
440 			msleep(3);
441 
442 			if (i2c_readbytes(state,state->config->demod_address,
443 					  &rec_buf[i*2],2)) {
444 				pr_warn("Load DVR Error 7 - %d\n", i);
445 				return -1;
446 			}
447 			/* If we didn't receive the right index, try again */
448 			if ((int)rec_buf[i*2+1]!=i+1){
449 			  i--;
450 			}
451 		}
452 		dprintk("read_fwbits %10ph\n", rec_buf);
453 
454 		pr_info("ver TU%02x%02x%02x VSB mode %02x Status %02x\n",
455 			rec_buf[2], rec_buf[4], rec_buf[6], rec_buf[12],
456 			rec_buf[10]);
457 
458 		rec_buf[0] = 0x04;
459 		rec_buf[1] = 0x00;
460 		rec_buf[2] = 0x03;
461 		rec_buf[3] = 0x00;
462 		msleep(20);
463 		if (i2c_writebytes(state,state->config->demod_address,
464 				   rec_buf,3)) {
465 			pr_warn("Load DVR Error 8\n");
466 			return -1;
467 		}
468 		msleep(20);
469 		if (i2c_readbytes(state,state->config->demod_address,
470 				  &rec_buf[8],2)) {
471 			pr_warn("Load DVR Error 9\n");
472 			return -1;
473 		}
474 		state->initialized = 1;
475 	}
476 
477 	return 0;
478 }
479 
or51211_get_tune_settings(struct dvb_frontend * fe,struct dvb_frontend_tune_settings * fesettings)480 static int or51211_get_tune_settings(struct dvb_frontend* fe,
481 				     struct dvb_frontend_tune_settings* fesettings)
482 {
483 	fesettings->min_delay_ms = 500;
484 	fesettings->step_size = 0;
485 	fesettings->max_drift = 0;
486 	return 0;
487 }
488 
or51211_release(struct dvb_frontend * fe)489 static void or51211_release(struct dvb_frontend* fe)
490 {
491 	struct or51211_state* state = fe->demodulator_priv;
492 	state->config->sleep(fe);
493 	kfree(state);
494 }
495 
496 static const struct dvb_frontend_ops or51211_ops;
497 
or51211_attach(const struct or51211_config * config,struct i2c_adapter * i2c)498 struct dvb_frontend* or51211_attach(const struct or51211_config* config,
499 				    struct i2c_adapter* i2c)
500 {
501 	struct or51211_state* state = NULL;
502 
503 	/* Allocate memory for the internal state */
504 	state = kzalloc(sizeof(struct or51211_state), GFP_KERNEL);
505 	if (state == NULL)
506 		return NULL;
507 
508 	/* Setup the state */
509 	state->config = config;
510 	state->i2c = i2c;
511 	state->initialized = 0;
512 	state->current_frequency = 0;
513 
514 	/* Create dvb_frontend */
515 	memcpy(&state->frontend.ops, &or51211_ops, sizeof(struct dvb_frontend_ops));
516 	state->frontend.demodulator_priv = state;
517 	return &state->frontend;
518 }
519 
520 static const struct dvb_frontend_ops or51211_ops = {
521 	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
522 	.info = {
523 		.name                  = "Oren OR51211 VSB Frontend",
524 		.frequency_min_hz      =  44 * MHz,
525 		.frequency_max_hz      = 958 * MHz,
526 		.frequency_stepsize_hz = 166666,
527 		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
528 			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
529 			FE_CAN_8VSB
530 	},
531 
532 	.release = or51211_release,
533 
534 	.init = or51211_init,
535 	.sleep = or51211_sleep,
536 
537 	.set_frontend = or51211_set_parameters,
538 	.get_tune_settings = or51211_get_tune_settings,
539 
540 	.read_status = or51211_read_status,
541 	.read_ber = or51211_read_ber,
542 	.read_signal_strength = or51211_read_signal_strength,
543 	.read_snr = or51211_read_snr,
544 	.read_ucblocks = or51211_read_ucblocks,
545 };
546 
547 module_param(debug, int, 0644);
548 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
549 
550 MODULE_DESCRIPTION("Oren OR51211 VSB [pcHDTV HD-2000] Demodulator Driver");
551 MODULE_AUTHOR("Kirk Lapray");
552 MODULE_LICENSE("GPL");
553 
554 EXPORT_SYMBOL_GPL(or51211_attach);
555 
556