1 /*
2  *  FM Driver for Connectivity chip of Texas Instruments.
3  *  This sub-module of FM driver implements FM RX functionality.
4  *
5  *  Copyright (C) 2011 Texas Instruments
6  *  Author: Raja Mani <raja_mani@ti.com>
7  *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License version 2 as
11  *  published by the Free Software Foundation.
12  *
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
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  */
23 
24 #include "fmdrv.h"
25 #include "fmdrv_common.h"
26 #include "fmdrv_rx.h"
27 
28 void fm_rx_reset_rds_cache(struct fmdev *fmdev)
29 {
30 	fmdev->rx.rds.flag = FM_RDS_DISABLE;
31 	fmdev->rx.rds.last_blk_idx = 0;
32 	fmdev->rx.rds.wr_idx = 0;
33 	fmdev->rx.rds.rd_idx = 0;
34 
35 	if (fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
36 		fmdev->irq_info.mask |= FM_LEV_EVENT;
37 }
38 
39 void fm_rx_reset_station_info(struct fmdev *fmdev)
40 {
41 	fmdev->rx.stat_info.picode = FM_NO_PI_CODE;
42 	fmdev->rx.stat_info.afcache_size = 0;
43 	fmdev->rx.stat_info.af_list_max = 0;
44 }
45 
46 int fm_rx_set_freq(struct fmdev *fmdev, u32 freq)
47 {
48 	unsigned long timeleft;
49 	u16 payload, curr_frq, intr_flag;
50 	u32 curr_frq_in_khz;
51 	u32 resp_len;
52 	int ret;
53 
54 	if (freq < fmdev->rx.region.bot_freq || freq > fmdev->rx.region.top_freq) {
55 		fmerr("Invalid frequency %d\n", freq);
56 		return -EINVAL;
57 	}
58 
59 	/* Set audio enable */
60 	payload = FM_RX_AUDIO_ENABLE_I2S_AND_ANALOG;
61 
62 	ret = fmc_send_cmd(fmdev, AUDIO_ENABLE_SET, REG_WR, &payload,
63 			sizeof(payload), NULL, NULL);
64 	if (ret < 0)
65 		return ret;
66 
67 	/* Set hilo to automatic selection */
68 	payload = FM_RX_IFFREQ_HILO_AUTOMATIC;
69 	ret = fmc_send_cmd(fmdev, HILO_SET, REG_WR, &payload,
70 			sizeof(payload), NULL, NULL);
71 	if (ret < 0)
72 		return ret;
73 
74 	/* Calculate frequency index and set*/
75 	payload = (freq - fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
76 
77 	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_WR, &payload,
78 			sizeof(payload), NULL, NULL);
79 	if (ret < 0)
80 		return ret;
81 
82 	/* Read flags - just to clear any pending interrupts if we had */
83 	ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2, NULL, NULL);
84 	if (ret < 0)
85 		return ret;
86 
87 	/* Enable FR, BL interrupts */
88 	intr_flag = fmdev->irq_info.mask;
89 	fmdev->irq_info.mask = (FM_FR_EVENT | FM_BL_EVENT);
90 	payload = fmdev->irq_info.mask;
91 	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
92 			sizeof(payload), NULL, NULL);
93 	if (ret < 0)
94 		return ret;
95 
96 	/* Start tune */
97 	payload = FM_TUNER_PRESET_MODE;
98 	ret = fmc_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
99 			sizeof(payload), NULL, NULL);
100 	if (ret < 0)
101 		goto exit;
102 
103 	/* Wait for tune ended interrupt */
104 	init_completion(&fmdev->maintask_comp);
105 	timeleft = wait_for_completion_timeout(&fmdev->maintask_comp,
106 			FM_DRV_TX_TIMEOUT);
107 	if (!timeleft) {
108 		fmerr("Timeout(%d sec),didn't get tune ended int\n",
109 			   jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
110 		ret = -ETIMEDOUT;
111 		goto exit;
112 	}
113 
114 	/* Read freq back to confirm */
115 	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, 2, &curr_frq, &resp_len);
116 	if (ret < 0)
117 		goto exit;
118 
119 	curr_frq = be16_to_cpu((__force __be16)curr_frq);
120 	curr_frq_in_khz = (fmdev->rx.region.bot_freq + ((u32)curr_frq * FM_FREQ_MUL));
121 
122 	if (curr_frq_in_khz != freq) {
123 		pr_info("Frequency is set to (%d) but "
124 			   "requested freq is (%d)\n", curr_frq_in_khz, freq);
125 	}
126 
127 	/* Update local cache  */
128 	fmdev->rx.freq = curr_frq_in_khz;
129 exit:
130 	/* Re-enable default FM interrupts */
131 	fmdev->irq_info.mask = intr_flag;
132 	payload = fmdev->irq_info.mask;
133 	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
134 			sizeof(payload), NULL, NULL);
135 	if (ret < 0)
136 		return ret;
137 
138 	/* Reset RDS cache and current station pointers */
139 	fm_rx_reset_rds_cache(fmdev);
140 	fm_rx_reset_station_info(fmdev);
141 
142 	return ret;
143 }
144 
145 static int fm_rx_set_channel_spacing(struct fmdev *fmdev, u32 spacing)
146 {
147 	u16 payload;
148 	int ret;
149 
150 	if (spacing > 0 && spacing <= 50000)
151 		spacing = FM_CHANNEL_SPACING_50KHZ;
152 	else if (spacing > 50000 && spacing <= 100000)
153 		spacing = FM_CHANNEL_SPACING_100KHZ;
154 	else
155 		spacing = FM_CHANNEL_SPACING_200KHZ;
156 
157 	/* set channel spacing */
158 	payload = spacing;
159 	ret = fmc_send_cmd(fmdev, CHANL_BW_SET, REG_WR, &payload,
160 			sizeof(payload), NULL, NULL);
161 	if (ret < 0)
162 		return ret;
163 
164 	fmdev->rx.region.chanl_space = spacing * FM_FREQ_MUL;
165 
166 	return ret;
167 }
168 
169 int fm_rx_seek(struct fmdev *fmdev, u32 seek_upward,
170 		u32 wrap_around, u32 spacing)
171 {
172 	u32 resp_len;
173 	u16 curr_frq, next_frq, last_frq;
174 	u16 payload, int_reason, intr_flag;
175 	u16 offset, space_idx;
176 	unsigned long timeleft;
177 	int ret;
178 
179 	/* Set channel spacing */
180 	ret = fm_rx_set_channel_spacing(fmdev, spacing);
181 	if (ret < 0) {
182 		fmerr("Failed to set channel spacing\n");
183 		return ret;
184 	}
185 
186 	/* Read the current frequency from chip */
187 	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL,
188 			sizeof(curr_frq), &curr_frq, &resp_len);
189 	if (ret < 0)
190 		return ret;
191 
192 	curr_frq = be16_to_cpu((__force __be16)curr_frq);
193 	last_frq = (fmdev->rx.region.top_freq - fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
194 
195 	/* Check the offset in order to be aligned to the channel spacing*/
196 	space_idx = fmdev->rx.region.chanl_space / FM_FREQ_MUL;
197 	offset = curr_frq % space_idx;
198 
199 	next_frq = seek_upward ? curr_frq + space_idx /* Seek Up */ :
200 				curr_frq - space_idx /* Seek Down */ ;
201 
202 	/*
203 	 * Add or subtract offset in order to stay aligned to the channel
204 	 * spacing.
205 	 */
206 	if ((short)next_frq < 0)
207 		next_frq = last_frq - offset;
208 	else if (next_frq > last_frq)
209 		next_frq = 0 + offset;
210 
211 again:
212 	/* Set calculated next frequency to perform seek */
213 	payload = next_frq;
214 	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_WR, &payload,
215 			sizeof(payload), NULL, NULL);
216 	if (ret < 0)
217 		return ret;
218 
219 	/* Set search direction (0:Seek Down, 1:Seek Up) */
220 	payload = (seek_upward ? FM_SEARCH_DIRECTION_UP : FM_SEARCH_DIRECTION_DOWN);
221 	ret = fmc_send_cmd(fmdev, SEARCH_DIR_SET, REG_WR, &payload,
222 			sizeof(payload), NULL, NULL);
223 	if (ret < 0)
224 		return ret;
225 
226 	/* Read flags - just to clear any pending interrupts if we had */
227 	ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2, NULL, NULL);
228 	if (ret < 0)
229 		return ret;
230 
231 	/* Enable FR, BL interrupts */
232 	intr_flag = fmdev->irq_info.mask;
233 	fmdev->irq_info.mask = (FM_FR_EVENT | FM_BL_EVENT);
234 	payload = fmdev->irq_info.mask;
235 	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
236 			sizeof(payload), NULL, NULL);
237 	if (ret < 0)
238 		return ret;
239 
240 	/* Start seek */
241 	payload = FM_TUNER_AUTONOMOUS_SEARCH_MODE;
242 	ret = fmc_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
243 			sizeof(payload), NULL, NULL);
244 	if (ret < 0)
245 		return ret;
246 
247 	/* Wait for tune ended/band limit reached interrupt */
248 	init_completion(&fmdev->maintask_comp);
249 	timeleft = wait_for_completion_timeout(&fmdev->maintask_comp,
250 			FM_DRV_RX_SEEK_TIMEOUT);
251 	if (!timeleft) {
252 		fmerr("Timeout(%d sec),didn't get tune ended int\n",
253 			   jiffies_to_msecs(FM_DRV_RX_SEEK_TIMEOUT) / 1000);
254 		return -ENODATA;
255 	}
256 
257 	int_reason = fmdev->irq_info.flag & (FM_TUNE_COMPLETE | FM_BAND_LIMIT);
258 
259 	/* Re-enable default FM interrupts */
260 	fmdev->irq_info.mask = intr_flag;
261 	payload = fmdev->irq_info.mask;
262 	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
263 			sizeof(payload), NULL, NULL);
264 	if (ret < 0)
265 		return ret;
266 
267 	if (int_reason & FM_BL_EVENT) {
268 		if (wrap_around == 0) {
269 			fmdev->rx.freq = seek_upward ?
270 				fmdev->rx.region.top_freq :
271 				fmdev->rx.region.bot_freq;
272 		} else {
273 			fmdev->rx.freq = seek_upward ?
274 				fmdev->rx.region.bot_freq :
275 				fmdev->rx.region.top_freq;
276 			/* Calculate frequency index to write */
277 			next_frq = (fmdev->rx.freq -
278 					fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
279 			goto again;
280 		}
281 	} else {
282 		/* Read freq to know where operation tune operation stopped */
283 		ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, 2,
284 				&curr_frq, &resp_len);
285 		if (ret < 0)
286 			return ret;
287 
288 		curr_frq = be16_to_cpu((__force __be16)curr_frq);
289 		fmdev->rx.freq = (fmdev->rx.region.bot_freq +
290 				((u32)curr_frq * FM_FREQ_MUL));
291 
292 	}
293 	/* Reset RDS cache and current station pointers */
294 	fm_rx_reset_rds_cache(fmdev);
295 	fm_rx_reset_station_info(fmdev);
296 
297 	return ret;
298 }
299 
300 int fm_rx_set_volume(struct fmdev *fmdev, u16 vol_to_set)
301 {
302 	u16 payload;
303 	int ret;
304 
305 	if (fmdev->curr_fmmode != FM_MODE_RX)
306 		return -EPERM;
307 
308 	if (vol_to_set > FM_RX_VOLUME_MAX) {
309 		fmerr("Volume is not within(%d-%d) range\n",
310 			   FM_RX_VOLUME_MIN, FM_RX_VOLUME_MAX);
311 		return -EINVAL;
312 	}
313 	vol_to_set *= FM_RX_VOLUME_GAIN_STEP;
314 
315 	payload = vol_to_set;
316 	ret = fmc_send_cmd(fmdev, VOLUME_SET, REG_WR, &payload,
317 			sizeof(payload), NULL, NULL);
318 	if (ret < 0)
319 		return ret;
320 
321 	fmdev->rx.volume = vol_to_set;
322 	return ret;
323 }
324 
325 /* Get volume */
326 int fm_rx_get_volume(struct fmdev *fmdev, u16 *curr_vol)
327 {
328 	if (fmdev->curr_fmmode != FM_MODE_RX)
329 		return -EPERM;
330 
331 	if (curr_vol == NULL) {
332 		fmerr("Invalid memory\n");
333 		return -ENOMEM;
334 	}
335 
336 	*curr_vol = fmdev->rx.volume / FM_RX_VOLUME_GAIN_STEP;
337 
338 	return 0;
339 }
340 
341 /* To get current band's bottom and top frequency */
342 int fm_rx_get_band_freq_range(struct fmdev *fmdev, u32 *bot_freq, u32 *top_freq)
343 {
344 	if (bot_freq != NULL)
345 		*bot_freq = fmdev->rx.region.bot_freq;
346 
347 	if (top_freq != NULL)
348 		*top_freq = fmdev->rx.region.top_freq;
349 
350 	return 0;
351 }
352 
353 /* Returns current band index (0-Europe/US; 1-Japan) */
354 void fm_rx_get_region(struct fmdev *fmdev, u8 *region)
355 {
356 	*region = fmdev->rx.region.fm_band;
357 }
358 
359 /* Sets band (0-Europe/US; 1-Japan) */
360 int fm_rx_set_region(struct fmdev *fmdev, u8 region_to_set)
361 {
362 	u16 payload;
363 	u32 new_frq = 0;
364 	int ret;
365 
366 	if (region_to_set != FM_BAND_EUROPE_US &&
367 	    region_to_set != FM_BAND_JAPAN) {
368 		fmerr("Invalid band\n");
369 		return -EINVAL;
370 	}
371 
372 	if (fmdev->rx.region.fm_band == region_to_set) {
373 		fmerr("Requested band is already configured\n");
374 		return 0;
375 	}
376 
377 	/* Send cmd to set the band  */
378 	payload = (u16)region_to_set;
379 	ret = fmc_send_cmd(fmdev, BAND_SET, REG_WR, &payload,
380 			sizeof(payload), NULL, NULL);
381 	if (ret < 0)
382 		return ret;
383 
384 	fmc_update_region_info(fmdev, region_to_set);
385 
386 	/* Check whether current RX frequency is within band boundary */
387 	if (fmdev->rx.freq < fmdev->rx.region.bot_freq)
388 		new_frq = fmdev->rx.region.bot_freq;
389 	else if (fmdev->rx.freq > fmdev->rx.region.top_freq)
390 		new_frq = fmdev->rx.region.top_freq;
391 
392 	if (new_frq) {
393 		fmdbg("Current freq is not within band limit boundary,"
394 				"switching to %d KHz\n", new_frq);
395 		 /* Current RX frequency is not in range. So, update it */
396 		ret = fm_rx_set_freq(fmdev, new_frq);
397 	}
398 
399 	return ret;
400 }
401 
402 /* Reads current mute mode (Mute Off/On/Attenuate)*/
403 int fm_rx_get_mute_mode(struct fmdev *fmdev, u8 *curr_mute_mode)
404 {
405 	if (fmdev->curr_fmmode != FM_MODE_RX)
406 		return -EPERM;
407 
408 	if (curr_mute_mode == NULL) {
409 		fmerr("Invalid memory\n");
410 		return -ENOMEM;
411 	}
412 
413 	*curr_mute_mode = fmdev->rx.mute_mode;
414 
415 	return 0;
416 }
417 
418 static int fm_config_rx_mute_reg(struct fmdev *fmdev)
419 {
420 	u16 payload, muteval;
421 	int ret;
422 
423 	muteval = 0;
424 	switch (fmdev->rx.mute_mode) {
425 	case FM_MUTE_ON:
426 		muteval = FM_RX_AC_MUTE_MODE;
427 		break;
428 
429 	case FM_MUTE_OFF:
430 		muteval = FM_RX_UNMUTE_MODE;
431 		break;
432 
433 	case FM_MUTE_ATTENUATE:
434 		muteval = FM_RX_SOFT_MUTE_FORCE_MODE;
435 		break;
436 	}
437 	if (fmdev->rx.rf_depend_mute == FM_RX_RF_DEPENDENT_MUTE_ON)
438 		muteval |= FM_RX_RF_DEP_MODE;
439 	else
440 		muteval &= ~FM_RX_RF_DEP_MODE;
441 
442 	payload = muteval;
443 	ret = fmc_send_cmd(fmdev, MUTE_STATUS_SET, REG_WR, &payload,
444 			sizeof(payload), NULL, NULL);
445 	if (ret < 0)
446 		return ret;
447 
448 	return 0;
449 }
450 
451 /* Configures mute mode (Mute Off/On/Attenuate) */
452 int fm_rx_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
453 {
454 	u8 org_state;
455 	int ret;
456 
457 	if (fmdev->rx.mute_mode == mute_mode_toset)
458 		return 0;
459 
460 	org_state = fmdev->rx.mute_mode;
461 	fmdev->rx.mute_mode = mute_mode_toset;
462 
463 	ret = fm_config_rx_mute_reg(fmdev);
464 	if (ret < 0) {
465 		fmdev->rx.mute_mode = org_state;
466 		return ret;
467 	}
468 
469 	return 0;
470 }
471 
472 /* Gets RF dependent soft mute mode enable/disable status */
473 int fm_rx_get_rfdepend_softmute(struct fmdev *fmdev, u8 *curr_mute_mode)
474 {
475 	if (fmdev->curr_fmmode != FM_MODE_RX)
476 		return -EPERM;
477 
478 	if (curr_mute_mode == NULL) {
479 		fmerr("Invalid memory\n");
480 		return -ENOMEM;
481 	}
482 
483 	*curr_mute_mode = fmdev->rx.rf_depend_mute;
484 
485 	return 0;
486 }
487 
488 /* Sets RF dependent soft mute mode */
489 int fm_rx_set_rfdepend_softmute(struct fmdev *fmdev, u8 rfdepend_mute)
490 {
491 	u8 org_state;
492 	int ret;
493 
494 	if (fmdev->curr_fmmode != FM_MODE_RX)
495 		return -EPERM;
496 
497 	if (rfdepend_mute != FM_RX_RF_DEPENDENT_MUTE_ON &&
498 	    rfdepend_mute != FM_RX_RF_DEPENDENT_MUTE_OFF) {
499 		fmerr("Invalid RF dependent soft mute\n");
500 		return -EINVAL;
501 	}
502 	if (fmdev->rx.rf_depend_mute == rfdepend_mute)
503 		return 0;
504 
505 	org_state = fmdev->rx.rf_depend_mute;
506 	fmdev->rx.rf_depend_mute = rfdepend_mute;
507 
508 	ret = fm_config_rx_mute_reg(fmdev);
509 	if (ret < 0) {
510 		fmdev->rx.rf_depend_mute = org_state;
511 		return ret;
512 	}
513 
514 	return 0;
515 }
516 
517 /* Returns the signal strength level of current channel */
518 int fm_rx_get_rssi_level(struct fmdev *fmdev, u16 *rssilvl)
519 {
520 	__be16 curr_rssi_lel;
521 	u32 resp_len;
522 	int ret;
523 
524 	if (rssilvl == NULL) {
525 		fmerr("Invalid memory\n");
526 		return -ENOMEM;
527 	}
528 	/* Read current RSSI level */
529 	ret = fmc_send_cmd(fmdev, RSSI_LVL_GET, REG_RD, NULL, 2,
530 			&curr_rssi_lel, &resp_len);
531 	if (ret < 0)
532 		return ret;
533 
534 	*rssilvl = be16_to_cpu(curr_rssi_lel);
535 
536 	return 0;
537 }
538 
539 /*
540  * Sets the signal strength level that once reached
541  * will stop the auto search process
542  */
543 int fm_rx_set_rssi_threshold(struct fmdev *fmdev, short rssi_lvl_toset)
544 {
545 	u16 payload;
546 	int ret;
547 
548 	if (rssi_lvl_toset < FM_RX_RSSI_THRESHOLD_MIN ||
549 			rssi_lvl_toset > FM_RX_RSSI_THRESHOLD_MAX) {
550 		fmerr("Invalid RSSI threshold level\n");
551 		return -EINVAL;
552 	}
553 	payload = (u16)rssi_lvl_toset;
554 	ret = fmc_send_cmd(fmdev, SEARCH_LVL_SET, REG_WR, &payload,
555 			sizeof(payload), NULL, NULL);
556 	if (ret < 0)
557 		return ret;
558 
559 	fmdev->rx.rssi_threshold = rssi_lvl_toset;
560 
561 	return 0;
562 }
563 
564 /* Returns current RX RSSI threshold value */
565 int fm_rx_get_rssi_threshold(struct fmdev *fmdev, short *curr_rssi_lvl)
566 {
567 	if (fmdev->curr_fmmode != FM_MODE_RX)
568 		return -EPERM;
569 
570 	if (curr_rssi_lvl == NULL) {
571 		fmerr("Invalid memory\n");
572 		return -ENOMEM;
573 	}
574 
575 	*curr_rssi_lvl = fmdev->rx.rssi_threshold;
576 
577 	return 0;
578 }
579 
580 /* Sets RX stereo/mono modes */
581 int fm_rx_set_stereo_mono(struct fmdev *fmdev, u16 mode)
582 {
583 	u16 payload;
584 	int ret;
585 
586 	if (mode != FM_STEREO_MODE && mode != FM_MONO_MODE) {
587 		fmerr("Invalid mode\n");
588 		return -EINVAL;
589 	}
590 
591 	/* Set stereo/mono mode */
592 	payload = (u16)mode;
593 	ret = fmc_send_cmd(fmdev, MOST_MODE_SET, REG_WR, &payload,
594 			sizeof(payload), NULL, NULL);
595 	if (ret < 0)
596 		return ret;
597 
598 	/* Set stereo blending mode */
599 	payload = FM_STEREO_SOFT_BLEND;
600 	ret = fmc_send_cmd(fmdev, MOST_BLEND_SET, REG_WR, &payload,
601 			sizeof(payload), NULL, NULL);
602 	if (ret < 0)
603 		return ret;
604 
605 	return 0;
606 }
607 
608 /* Gets current RX stereo/mono mode */
609 int fm_rx_get_stereo_mono(struct fmdev *fmdev, u16 *mode)
610 {
611 	__be16 curr_mode;
612 	u32 resp_len;
613 	int ret;
614 
615 	if (mode == NULL) {
616 		fmerr("Invalid memory\n");
617 		return -ENOMEM;
618 	}
619 
620 	ret = fmc_send_cmd(fmdev, MOST_MODE_SET, REG_RD, NULL, 2,
621 			&curr_mode, &resp_len);
622 	if (ret < 0)
623 		return ret;
624 
625 	*mode = be16_to_cpu(curr_mode);
626 
627 	return 0;
628 }
629 
630 /* Choose RX de-emphasis filter mode (50us/75us) */
631 int fm_rx_set_deemphasis_mode(struct fmdev *fmdev, u16 mode)
632 {
633 	u16 payload;
634 	int ret;
635 
636 	if (fmdev->curr_fmmode != FM_MODE_RX)
637 		return -EPERM;
638 
639 	if (mode != FM_RX_EMPHASIS_FILTER_50_USEC &&
640 			mode != FM_RX_EMPHASIS_FILTER_75_USEC) {
641 		fmerr("Invalid rx de-emphasis mode (%d)\n", mode);
642 		return -EINVAL;
643 	}
644 
645 	payload = mode;
646 	ret = fmc_send_cmd(fmdev, DEMPH_MODE_SET, REG_WR, &payload,
647 			sizeof(payload), NULL, NULL);
648 	if (ret < 0)
649 		return ret;
650 
651 	fmdev->rx.deemphasis_mode = mode;
652 
653 	return 0;
654 }
655 
656 /* Gets current RX de-emphasis filter mode */
657 int fm_rx_get_deemph_mode(struct fmdev *fmdev, u16 *curr_deemphasis_mode)
658 {
659 	if (fmdev->curr_fmmode != FM_MODE_RX)
660 		return -EPERM;
661 
662 	if (curr_deemphasis_mode == NULL) {
663 		fmerr("Invalid memory\n");
664 		return -ENOMEM;
665 	}
666 
667 	*curr_deemphasis_mode = fmdev->rx.deemphasis_mode;
668 
669 	return 0;
670 }
671 
672 /* Enable/Disable RX RDS */
673 int fm_rx_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
674 {
675 	u16 payload;
676 	int ret;
677 
678 	if (rds_en_dis != FM_RDS_ENABLE && rds_en_dis != FM_RDS_DISABLE) {
679 		fmerr("Invalid rds option\n");
680 		return -EINVAL;
681 	}
682 
683 	if (rds_en_dis == FM_RDS_ENABLE
684 	    && fmdev->rx.rds.flag == FM_RDS_DISABLE) {
685 		/* Turn on RX RDS and RDS circuit */
686 		payload = FM_RX_PWR_SET_FM_AND_RDS_BLK_ON;
687 		ret = fmc_send_cmd(fmdev, POWER_SET, REG_WR, &payload,
688 				sizeof(payload), NULL, NULL);
689 		if (ret < 0)
690 			return ret;
691 
692 		/* Clear and reset RDS FIFO */
693 		payload = FM_RX_RDS_FLUSH_FIFO;
694 		ret = fmc_send_cmd(fmdev, RDS_CNTRL_SET, REG_WR, &payload,
695 		sizeof(payload), NULL, NULL);
696 		if (ret < 0)
697 			return ret;
698 
699 		/* Read flags - just to clear any pending interrupts. */
700 		ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2,
701 				NULL, NULL);
702 		if (ret < 0)
703 			return ret;
704 
705 		/* Set RDS FIFO threshold value */
706 		payload = FM_RX_RDS_FIFO_THRESHOLD;
707 		ret = fmc_send_cmd(fmdev, RDS_MEM_SET, REG_WR, &payload,
708 		sizeof(payload), NULL, NULL);
709 		if (ret < 0)
710 			return ret;
711 
712 		/* Enable RDS interrupt */
713 		fmdev->irq_info.mask |= FM_RDS_EVENT;
714 		payload = fmdev->irq_info.mask;
715 		ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
716 				sizeof(payload), NULL, NULL);
717 		if (ret < 0) {
718 			fmdev->irq_info.mask &= ~FM_RDS_EVENT;
719 			return ret;
720 		}
721 
722 		/* Update our local flag */
723 		fmdev->rx.rds.flag = FM_RDS_ENABLE;
724 	} else if (rds_en_dis == FM_RDS_DISABLE
725 		   && fmdev->rx.rds.flag == FM_RDS_ENABLE) {
726 		/* Turn off RX RDS */
727 		payload = FM_RX_PWR_SET_FM_ON_RDS_OFF;
728 		ret = fmc_send_cmd(fmdev, POWER_SET, REG_WR, &payload,
729 				sizeof(payload), NULL, NULL);
730 		if (ret < 0)
731 			return ret;
732 
733 		/* Reset RDS pointers */
734 		fmdev->rx.rds.last_blk_idx = 0;
735 		fmdev->rx.rds.wr_idx = 0;
736 		fmdev->rx.rds.rd_idx = 0;
737 		fm_rx_reset_station_info(fmdev);
738 
739 		/* Update RDS local cache */
740 		fmdev->irq_info.mask &= ~(FM_RDS_EVENT);
741 		fmdev->rx.rds.flag = FM_RDS_DISABLE;
742 	}
743 
744 	return 0;
745 }
746 
747 /* Returns current RX RDS enable/disable status */
748 int fm_rx_get_rds_mode(struct fmdev *fmdev, u8 *curr_rds_en_dis)
749 {
750 	if (fmdev->curr_fmmode != FM_MODE_RX)
751 		return -EPERM;
752 
753 	if (curr_rds_en_dis == NULL) {
754 		fmerr("Invalid memory\n");
755 		return -ENOMEM;
756 	}
757 
758 	*curr_rds_en_dis = fmdev->rx.rds.flag;
759 
760 	return 0;
761 }
762 
763 /* Sets RDS operation mode (RDS/RDBS) */
764 int fm_rx_set_rds_system(struct fmdev *fmdev, u8 rds_mode)
765 {
766 	u16 payload;
767 	int ret;
768 
769 	if (fmdev->curr_fmmode != FM_MODE_RX)
770 		return -EPERM;
771 
772 	if (rds_mode != FM_RDS_SYSTEM_RDS && rds_mode != FM_RDS_SYSTEM_RBDS) {
773 		fmerr("Invalid rds mode\n");
774 		return -EINVAL;
775 	}
776 	/* Set RDS operation mode */
777 	payload = (u16)rds_mode;
778 	ret = fmc_send_cmd(fmdev, RDS_SYSTEM_SET, REG_WR, &payload,
779 			sizeof(payload), NULL, NULL);
780 	if (ret < 0)
781 		return ret;
782 
783 	fmdev->rx.rds_mode = rds_mode;
784 
785 	return 0;
786 }
787 
788 /* Returns current RDS operation mode */
789 int fm_rx_get_rds_system(struct fmdev *fmdev, u8 *rds_mode)
790 {
791 	if (fmdev->curr_fmmode != FM_MODE_RX)
792 		return -EPERM;
793 
794 	if (rds_mode == NULL) {
795 		fmerr("Invalid memory\n");
796 		return -ENOMEM;
797 	}
798 
799 	*rds_mode = fmdev->rx.rds_mode;
800 
801 	return 0;
802 }
803 
804 /* Configures Alternate Frequency switch mode */
805 int fm_rx_set_af_switch(struct fmdev *fmdev, u8 af_mode)
806 {
807 	u16 payload;
808 	int ret;
809 
810 	if (fmdev->curr_fmmode != FM_MODE_RX)
811 		return -EPERM;
812 
813 	if (af_mode != FM_RX_RDS_AF_SWITCH_MODE_ON &&
814 	    af_mode != FM_RX_RDS_AF_SWITCH_MODE_OFF) {
815 		fmerr("Invalid af mode\n");
816 		return -EINVAL;
817 	}
818 	/* Enable/disable low RSSI interrupt based on af_mode */
819 	if (af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
820 		fmdev->irq_info.mask |= FM_LEV_EVENT;
821 	else
822 		fmdev->irq_info.mask &= ~FM_LEV_EVENT;
823 
824 	payload = fmdev->irq_info.mask;
825 	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
826 			sizeof(payload), NULL, NULL);
827 	if (ret < 0)
828 		return ret;
829 
830 	fmdev->rx.af_mode = af_mode;
831 
832 	return 0;
833 }
834 
835 /* Returns Alternate Frequency switch status */
836 int fm_rx_get_af_switch(struct fmdev *fmdev, u8 *af_mode)
837 {
838 	if (fmdev->curr_fmmode != FM_MODE_RX)
839 		return -EPERM;
840 
841 	if (af_mode == NULL) {
842 		fmerr("Invalid memory\n");
843 		return -ENOMEM;
844 	}
845 
846 	*af_mode = fmdev->rx.af_mode;
847 
848 	return 0;
849 }
850