[media] drivers:media:radio: wl128x: FM driver RX sources

This has implementation for FM RX functionality.
It communicates with FM V4l2 module and FM common module
Signed-off-by: Manjunatha Halli <manjunatha_halli@ti.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/wl128x/fmdrv_rx.c

+/*
+ *  FM Driver for Connectivity chip of Texas Instruments.
+ *  This sub-module of FM driver implements FM RX functionality.
+ *
+ *  Copyright (C) 2011 Texas Instruments
+ *  Author: Raja Mani <raja_mani@ti.com>
+ *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "fmdrv.h"
+#include "fmdrv_common.h"
+#include "fmdrv_rx.h"
+
+void fm_rx_reset_rds_cache(struct fmdev *fmdev)
+{
+	fmdev->rx.rds.flag = FM_RDS_DISABLE;
+	fmdev->rx.rds.last_blk_idx = 0;
+	fmdev->rx.rds.wr_idx = 0;
+	fmdev->rx.rds.rd_idx = 0;
+
+	if (fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
+		fmdev->irq_info.mask |= FM_LEV_EVENT;
+}
+
+void fm_rx_reset_station_info(struct fmdev *fmdev)
+{
+	fmdev->rx.stat_info.picode = FM_NO_PI_CODE;
+	fmdev->rx.stat_info.afcache_size = 0;
+	fmdev->rx.stat_info.af_list_max = 0;
+}
+
+u32 fm_rx_set_freq(struct fmdev *fmdev, u32 freq)
+{
+	unsigned long timeleft;
+	u16 payload, curr_frq, intr_flag;
+	u32 curr_frq_in_khz;
+	u32 ret, resp_len;
+
+	if (freq < fmdev->rx.region.bot_freq || freq > fmdev->rx.region.top_freq) {
+		fmerr("Invalid frequency %d\n", freq);
+		return -EINVAL;
+	}
+
+	/* Set audio enable */
+	payload = FM_RX_AUDIO_ENABLE_I2S_AND_ANALOG;
+
+	ret = fmc_send_cmd(fmdev, AUDIO_ENABLE_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Set hilo to automatic selection */
+	payload = FM_RX_IFFREQ_HILO_AUTOMATIC;
+	ret = fmc_send_cmd(fmdev, HILO_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Calculate frequency index and set*/
+	payload = (freq - fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
+
+	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Read flags - just to clear any pending interrupts if we had */
+	ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2, NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Enable FR, BL interrupts */
+	intr_flag = fmdev->irq_info.mask;
+	fmdev->irq_info.mask = (FM_FR_EVENT | FM_BL_EVENT);
+	payload = fmdev->irq_info.mask;
+	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Start tune */
+	payload = FM_TUNER_PRESET_MODE;
+	ret = fmc_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		goto exit;
+
+	/* Wait for tune ended interrupt */
+	init_completion(&fmdev->maintask_comp);
+	timeleft = wait_for_completion_timeout(&fmdev->maintask_comp,
+			FM_DRV_TX_TIMEOUT);
+	if (!timeleft) {
+		fmerr("Timeout(%d sec),didn't get tune ended int\n",
+			   jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
+		ret = -ETIMEDOUT;
+		goto exit;
+	}
+
+	/* Read freq back to confirm */
+	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, 2, &curr_frq, &resp_len);
+	if (ret < 0)
+		goto exit;
+
+	curr_frq = be16_to_cpu(curr_frq);
+	curr_frq_in_khz = (fmdev->rx.region.bot_freq + ((u32)curr_frq * FM_FREQ_MUL));
+
+	if (curr_frq_in_khz != freq) {
+		pr_info("Frequency is set to (%d) but "
+			   "requested freq is (%d)\n", curr_frq_in_khz, freq);
+	}
+
+	/* Update local cache  */
+	fmdev->rx.freq = curr_frq_in_khz;
+exit:
+	/* Re-enable default FM interrupts */
+	fmdev->irq_info.mask = intr_flag;
+	payload = fmdev->irq_info.mask;
+	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Reset RDS cache and current station pointers */
+	fm_rx_reset_rds_cache(fmdev);
+	fm_rx_reset_station_info(fmdev);
+
+	return ret;
+}
+
+static u32 fm_rx_set_channel_spacing(struct fmdev *fmdev, u32 spacing)
+{
+	u16 payload;
+	u32 ret;
+
+	if (spacing > 0 && spacing <= 50000)
+		spacing = FM_CHANNEL_SPACING_50KHZ;
+	else if (spacing > 50000 && spacing <= 100000)
+		spacing = FM_CHANNEL_SPACING_100KHZ;
+	else
+		spacing = FM_CHANNEL_SPACING_200KHZ;
+
+	/* set channel spacing */
+	payload = spacing;
+	ret = fmc_send_cmd(fmdev, CHANL_BW_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.region.chanl_space = spacing * FM_FREQ_MUL;
+
+	return ret;
+}
+
+u32 fm_rx_seek(struct fmdev *fmdev, u32 seek_upward,
+		u32 wrap_around, u32 spacing)
+{
+	u32 resp_len;
+	u16 curr_frq, next_frq, last_frq;
+	u16 payload, int_reason, intr_flag;
+	u16 offset, space_idx;
+	unsigned long timeleft;
+	u32 ret;
+
+	/* Set channel spacing */
+	ret = fm_rx_set_channel_spacing(fmdev, spacing);
+	if (ret < 0) {
+		fmerr("Failed to set channel spacing\n");
+		return ret;
+	}
+
+	/* Read the current frequency from chip */
+	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL,
+			sizeof(curr_frq), &curr_frq, &resp_len);
+	if (ret < 0)
+		return ret;
+
+	curr_frq = be16_to_cpu(curr_frq);
+	last_frq = (fmdev->rx.region.top_freq - fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
+
+	/* Check the offset in order to be aligned to the channel spacing*/
+	space_idx = fmdev->rx.region.chanl_space / FM_FREQ_MUL;
+	offset = curr_frq % space_idx;
+
+	next_frq = seek_upward ? curr_frq + space_idx /* Seek Up */ :
+				curr_frq - space_idx /* Seek Down */ ;
+
+	/*
+	 * Add or subtract offset in order to stay aligned to the channel
+	 * spacing.
+	 */
+	if ((short)next_frq < 0)
+		next_frq = last_frq - offset;
+	else if (next_frq > last_frq)
+		next_frq = 0 + offset;
+
+again:
+	/* Set calculated next frequency to perform seek */
+	payload = next_frq;
+	ret = fmc_send_cmd(fmdev, FREQ_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Set search direction (0:Seek Down, 1:Seek Up) */
+	payload = (seek_upward ? FM_SEARCH_DIRECTION_UP : FM_SEARCH_DIRECTION_DOWN);
+	ret = fmc_send_cmd(fmdev, SEARCH_DIR_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Read flags - just to clear any pending interrupts if we had */
+	ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2, NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Enable FR, BL interrupts */
+	intr_flag = fmdev->irq_info.mask;
+	fmdev->irq_info.mask = (FM_FR_EVENT | FM_BL_EVENT);
+	payload = fmdev->irq_info.mask;
+	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Start seek */
+	payload = FM_TUNER_AUTONOMOUS_SEARCH_MODE;
+	ret = fmc_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Wait for tune ended/band limit reached interrupt */
+	init_completion(&fmdev->maintask_comp);
+	timeleft = wait_for_completion_timeout(&fmdev->maintask_comp,
+			FM_DRV_RX_SEEK_TIMEOUT);
+	if (!timeleft) {
+		fmerr("Timeout(%d sec),didn't get tune ended int\n",
+			   jiffies_to_msecs(FM_DRV_RX_SEEK_TIMEOUT) / 1000);
+		return -ETIMEDOUT;
+	}
+
+	int_reason = fmdev->irq_info.flag & (FM_TUNE_COMPLETE | FM_BAND_LIMIT);
+
+	/* Re-enable default FM interrupts */
+	fmdev->irq_info.mask = intr_flag;
+	payload = fmdev->irq_info.mask;
+	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	if (int_reason & FM_BL_EVENT) {
+		if (wrap_around == 0) {
+			fmdev->rx.freq = seek_upward ?
+				fmdev->rx.region.top_freq :
+				fmdev->rx.region.bot_freq;
+		} else {
+			fmdev->rx.freq = seek_upward ?
+				fmdev->rx.region.bot_freq :
+				fmdev->rx.region.top_freq;
+			/* Calculate frequency index to write */
+			next_frq = (fmdev->rx.freq -
+					fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
+			goto again;
+		}
+	} else {
+		/* Read freq to know where operation tune operation stopped */
+		ret = fmc_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, 2,
+				&curr_frq, &resp_len);
+		if (ret < 0)
+			return ret;
+
+		curr_frq = be16_to_cpu(curr_frq);
+		fmdev->rx.freq = (fmdev->rx.region.bot_freq +
+				((u32)curr_frq * FM_FREQ_MUL));
+
+	}
+	/* Reset RDS cache and current station pointers */
+	fm_rx_reset_rds_cache(fmdev);
+	fm_rx_reset_station_info(fmdev);
+
+	return ret;
+}
+
+u32 fm_rx_set_volume(struct fmdev *fmdev, u16 vol_to_set)
+{
+	u16 payload;
+	u32 ret;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (vol_to_set < FM_RX_VOLUME_MIN || vol_to_set > FM_RX_VOLUME_MAX) {
+		fmerr("Volume is not within(%d-%d) range\n",
+			   FM_RX_VOLUME_MIN, FM_RX_VOLUME_MAX);
+		return -EINVAL;
+	}
+	vol_to_set *= FM_RX_VOLUME_GAIN_STEP;
+
+	payload = vol_to_set;
+	ret = fmc_send_cmd(fmdev, VOLUME_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.volume = vol_to_set;
+	return ret;
+}
+
+/* Get volume */
+u32 fm_rx_get_volume(struct fmdev *fmdev, u16 *curr_vol)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_vol == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_vol = fmdev->rx.volume / FM_RX_VOLUME_GAIN_STEP;
+
+	return 0;
+}
+
+/* To get current band's bottom and top frequency */
+u32 fm_rx_get_band_freq_range(struct fmdev *fmdev, u32 *bot_freq, u32 *top_freq)
+{
+	if (bot_freq != NULL)
+		*bot_freq = fmdev->rx.region.bot_freq;
+
+	if (top_freq != NULL)
+		*top_freq = fmdev->rx.region.top_freq;
+
+	return 0;
+}
+
+/* Returns current band index (0-Europe/US; 1-Japan) */
+void fm_rx_get_region(struct fmdev *fmdev, u8 *region)
+{
+	*region = fmdev->rx.region.fm_band;
+}
+
+/* Sets band (0-Europe/US; 1-Japan) */
+u32 fm_rx_set_region(struct fmdev *fmdev, u8 region_to_set)
+{
+	u16 payload;
+	u32 new_frq = 0;
+	u32 ret;
+
+	if (region_to_set != FM_BAND_EUROPE_US &&
+	    region_to_set != FM_BAND_JAPAN) {
+		fmerr("Invalid band\n");
+		return -EINVAL;
+	}
+
+	if (fmdev->rx.region.fm_band == region_to_set) {
+		fmerr("Requested band is already configured\n");
+		return 0;
+	}
+
+	/* Send cmd to set the band  */
+	payload = (u16)region_to_set;
+	ret = fmc_send_cmd(fmdev, BAND_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmc_update_region_info(fmdev, region_to_set);
+
+	/* Check whether current RX frequency is within band boundary */
+	if (fmdev->rx.freq < fmdev->rx.region.bot_freq)
+		new_frq = fmdev->rx.region.bot_freq;
+	else if (fmdev->rx.freq > fmdev->rx.region.top_freq)
+		new_frq = fmdev->rx.region.top_freq;
+
+	if (new_frq) {
+		fmdbg("Current freq is not within band limit boundary,"
+				"switching to %d KHz\n", new_frq);
+		 /* Current RX frequency is not in range. So, update it */
+		ret = fm_rx_set_freq(fmdev, new_frq);
+	}
+
+	return ret;
+}
+
+/* Reads current mute mode (Mute Off/On/Attenuate)*/
+u32 fm_rx_get_mute_mode(struct fmdev *fmdev, u8 *curr_mute_mode)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_mute_mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_mute_mode = fmdev->rx.mute_mode;
+
+	return 0;
+}
+
+static u32 fm_config_rx_mute_reg(struct fmdev *fmdev)
+{
+	u16 payload, muteval;
+	u32 ret;
+
+	muteval = 0;
+	switch (fmdev->rx.mute_mode) {
+	case FM_MUTE_ON:
+		muteval = FM_RX_AC_MUTE_MODE;
+		break;
+
+	case FM_MUTE_OFF:
+		muteval = FM_RX_UNMUTE_MODE;
+		break;
+
+	case FM_MUTE_ATTENUATE:
+		muteval = FM_RX_SOFT_MUTE_FORCE_MODE;
+		break;
+	}
+	if (fmdev->rx.rf_depend_mute == FM_RX_RF_DEPENDENT_MUTE_ON)
+		muteval |= FM_RX_RF_DEP_MODE;
+	else
+		muteval &= ~FM_RX_RF_DEP_MODE;
+
+	payload = muteval;
+	ret = fmc_send_cmd(fmdev, MUTE_STATUS_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/* Configures mute mode (Mute Off/On/Attenuate) */
+u32 fm_rx_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
+{
+	u8 org_state;
+	u32 ret;
+
+	if (fmdev->rx.mute_mode == mute_mode_toset)
+		return 0;
+
+	org_state = fmdev->rx.mute_mode;
+	fmdev->rx.mute_mode = mute_mode_toset;
+
+	ret = fm_config_rx_mute_reg(fmdev);
+	if (ret < 0) {
+		fmdev->rx.mute_mode = org_state;
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Gets RF dependent soft mute mode enable/disable status */
+u32 fm_rx_get_rfdepend_softmute(struct fmdev *fmdev, u8 *curr_mute_mode)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_mute_mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_mute_mode = fmdev->rx.rf_depend_mute;
+
+	return 0;
+}
+
+/* Sets RF dependent soft mute mode */
+u32 fm_rx_set_rfdepend_softmute(struct fmdev *fmdev, u8 rfdepend_mute)
+{
+	u8 org_state;
+	u32 ret;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (rfdepend_mute != FM_RX_RF_DEPENDENT_MUTE_ON &&
+	    rfdepend_mute != FM_RX_RF_DEPENDENT_MUTE_OFF) {
+		fmerr("Invalid RF dependent soft mute\n");
+		return -EINVAL;
+	}
+	if (fmdev->rx.rf_depend_mute == rfdepend_mute)
+		return 0;
+
+	org_state = fmdev->rx.rf_depend_mute;
+	fmdev->rx.rf_depend_mute = rfdepend_mute;
+
+	ret = fm_config_rx_mute_reg(fmdev);
+	if (ret < 0) {
+		fmdev->rx.rf_depend_mute = org_state;
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Returns the signal strength level of current channel */
+u32 fm_rx_get_rssi_level(struct fmdev *fmdev, u16 *rssilvl)
+{
+	u16 curr_rssi_lel;
+	u32 resp_len;
+	u32 ret;
+
+	if (rssilvl == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+	/* Read current RSSI level */
+	ret = fmc_send_cmd(fmdev, RSSI_LVL_GET, REG_RD, NULL, 2,
+			&curr_rssi_lel, &resp_len);
+	if (ret < 0)
+		return ret;
+
+	*rssilvl = be16_to_cpu(curr_rssi_lel);
+
+	return 0;
+}
+
+/*
+ * Sets the signal strength level that once reached
+ * will stop the auto search process
+ */
+u32 fm_rx_set_rssi_threshold(struct fmdev *fmdev, short rssi_lvl_toset)
+{
+	u16 payload;
+	u32 ret;
+
+	if (rssi_lvl_toset < FM_RX_RSSI_THRESHOLD_MIN ||
+			rssi_lvl_toset > FM_RX_RSSI_THRESHOLD_MAX) {
+		fmerr("Invalid RSSI threshold level\n");
+		return -EINVAL;
+	}
+	payload = (u16)rssi_lvl_toset;
+	ret = fmc_send_cmd(fmdev, SEARCH_LVL_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.rssi_threshold = rssi_lvl_toset;
+
+	return 0;
+}
+
+/* Returns current RX RSSI threshold value */
+u32 fm_rx_get_rssi_threshold(struct fmdev *fmdev, short *curr_rssi_lvl)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_rssi_lvl == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_rssi_lvl = fmdev->rx.rssi_threshold;
+
+	return 0;
+}
+
+/* Sets RX stereo/mono modes */
+u32 fm_rx_set_stereo_mono(struct fmdev *fmdev, u16 mode)
+{
+	u16 payload;
+	u32 ret;
+
+	if (mode != FM_STEREO_MODE && mode != FM_MONO_MODE) {
+		fmerr("Invalid mode\n");
+		return -EINVAL;
+	}
+
+	/* Set stereo/mono mode */
+	payload = (u16)mode;
+	ret = fmc_send_cmd(fmdev, MOST_MODE_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	/* Set stereo blending mode */
+	payload = FM_STEREO_SOFT_BLEND;
+	ret = fmc_send_cmd(fmdev, MOST_BLEND_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/* Gets current RX stereo/mono mode */
+u32 fm_rx_get_stereo_mono(struct fmdev *fmdev, u16 *mode)
+{
+	u16 curr_mode;
+	u32 ret, resp_len;
+
+	if (mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	ret = fmc_send_cmd(fmdev, MOST_MODE_SET, REG_RD, NULL, 2,
+			&curr_mode, &resp_len);
+	if (ret < 0)
+		return ret;
+
+	*mode = be16_to_cpu(curr_mode);
+
+	return 0;
+}
+
+/* Choose RX de-emphasis filter mode (50us/75us) */
+u32 fm_rx_set_deemphasis_mode(struct fmdev *fmdev, u16 mode)
+{
+	u16 payload;
+	u32 ret;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (mode != FM_RX_EMPHASIS_FILTER_50_USEC &&
+			mode != FM_RX_EMPHASIS_FILTER_75_USEC) {
+		fmerr("Invalid rx de-emphasis mode (%d)\n", mode);
+		return -EINVAL;
+	}
+
+	payload = mode;
+	ret = fmc_send_cmd(fmdev, DEMPH_MODE_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.deemphasis_mode = mode;
+
+	return 0;
+}
+
+/* Gets current RX de-emphasis filter mode */
+u32 fm_rx_get_deemph_mode(struct fmdev *fmdev, u16 *curr_deemphasis_mode)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_deemphasis_mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_deemphasis_mode = fmdev->rx.deemphasis_mode;
+
+	return 0;
+}
+
+/* Enable/Disable RX RDS */
+u32 fm_rx_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
+{
+	u16 payload;
+	u32 ret;
+
+	if (rds_en_dis != FM_RDS_ENABLE && rds_en_dis != FM_RDS_DISABLE) {
+		fmerr("Invalid rds option\n");
+		return -EINVAL;
+	}
+
+	if (rds_en_dis == FM_RDS_ENABLE
+	    && fmdev->rx.rds.flag == FM_RDS_DISABLE) {
+		/* Turn on RX RDS and RDS circuit */
+		payload = FM_RX_PWR_SET_FM_AND_RDS_BLK_ON;
+		ret = fmc_send_cmd(fmdev, POWER_SET, REG_WR, &payload,
+				sizeof(payload), NULL, NULL);
+		if (ret < 0)
+			return ret;
+
+		/* Clear and reset RDS FIFO */
+		payload = FM_RX_RDS_FLUSH_FIFO;
+		ret = fmc_send_cmd(fmdev, RDS_CNTRL_SET, REG_WR, &payload,
+		sizeof(payload), NULL, NULL);
+		if (ret < 0)
+			return ret;
+
+		/* Read flags - just to clear any pending interrupts. */
+		ret = fmc_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, 2,
+				NULL, NULL);
+		if (ret < 0)
+			return ret;
+
+		/* Set RDS FIFO threshold value */
+		payload = FM_RX_RDS_FIFO_THRESHOLD;
+		ret = fmc_send_cmd(fmdev, RDS_MEM_SET, REG_WR, &payload,
+		sizeof(payload), NULL, NULL);
+		if (ret < 0)
+			return ret;
+
+		/* Enable RDS interrupt */
+		fmdev->irq_info.mask |= FM_RDS_EVENT;
+		payload = fmdev->irq_info.mask;
+		ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+				sizeof(payload), NULL, NULL);
+		if (ret < 0) {
+			fmdev->irq_info.mask &= ~FM_RDS_EVENT;
+			return ret;
+		}
+
+		/* Update our local flag */
+		fmdev->rx.rds.flag = FM_RDS_ENABLE;
+	} else if (rds_en_dis == FM_RDS_DISABLE
+		   && fmdev->rx.rds.flag == FM_RDS_ENABLE) {
+		/* Turn off RX RDS */
+		payload = FM_RX_PWR_SET_FM_ON_RDS_OFF;
+		ret = fmc_send_cmd(fmdev, POWER_SET, REG_WR, &payload,
+				sizeof(payload), NULL, NULL);
+		if (ret < 0)
+			return ret;
+
+		/* Reset RDS pointers */
+		fmdev->rx.rds.last_blk_idx = 0;
+		fmdev->rx.rds.wr_idx = 0;
+		fmdev->rx.rds.rd_idx = 0;
+		fm_rx_reset_station_info(fmdev);
+
+		/* Update RDS local cache */
+		fmdev->irq_info.mask &= ~(FM_RDS_EVENT);
+		fmdev->rx.rds.flag = FM_RDS_DISABLE;
+	}
+
+	return 0;
+}
+
+/* Returns current RX RDS enable/disable status */
+u32 fm_rx_get_rds_mode(struct fmdev *fmdev, u8 *curr_rds_en_dis)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (curr_rds_en_dis == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*curr_rds_en_dis = fmdev->rx.rds.flag;
+
+	return 0;
+}
+
+/* Sets RDS operation mode (RDS/RDBS) */
+u32 fm_rx_set_rds_system(struct fmdev *fmdev, u8 rds_mode)
+{
+	u16 payload;
+	u32 ret;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (rds_mode != FM_RDS_SYSTEM_RDS && rds_mode != FM_RDS_SYSTEM_RBDS) {
+		fmerr("Invalid rds mode\n");
+		return -EINVAL;
+	}
+	/* Set RDS operation mode */
+	payload = (u16)rds_mode;
+	ret = fmc_send_cmd(fmdev, RDS_SYSTEM_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.rds_mode = rds_mode;
+
+	return 0;
+}
+
+/* Returns current RDS operation mode */
+u32 fm_rx_get_rds_system(struct fmdev *fmdev, u8 *rds_mode)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (rds_mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*rds_mode = fmdev->rx.rds_mode;
+
+	return 0;
+}
+
+/* Configures Alternate Frequency switch mode */
+u32 fm_rx_set_af_switch(struct fmdev *fmdev, u8 af_mode)
+{
+	u16 payload;
+	u32 ret;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (af_mode != FM_RX_RDS_AF_SWITCH_MODE_ON &&
+	    af_mode != FM_RX_RDS_AF_SWITCH_MODE_OFF) {
+		fmerr("Invalid af mode\n");
+		return -EINVAL;
+	}
+	/* Enable/disable low RSSI interrupt based on af_mode */
+	if (af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
+		fmdev->irq_info.mask |= FM_LEV_EVENT;
+	else
+		fmdev->irq_info.mask &= ~FM_LEV_EVENT;
+
+	payload = fmdev->irq_info.mask;
+	ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
+			sizeof(payload), NULL, NULL);
+	if (ret < 0)
+		return ret;
+
+	fmdev->rx.af_mode = af_mode;
+
+	return 0;
+}
+
+/* Returns Alternate Frequency switch status */
+u32 fm_rx_get_af_switch(struct fmdev *fmdev, u8 *af_mode)
+{
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	if (af_mode == NULL) {
+		fmerr("Invalid memory\n");
+		return -ENOMEM;
+	}
+
+	*af_mode = fmdev->rx.af_mode;
+
+	return 0;
+}

drivers/media/radio/wl128x/fmdrv_rx.h

+/*
+ *  FM Driver for Connectivity chip of Texas Instruments.
+ *  FM RX module header.
+ *
+ *  Copyright (C) 2011 Texas Instruments
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _FMDRV_RX_H
+#define _FMDRV_RX_H
+
+u32 fm_rx_set_freq(struct fmdev *, u32);
+u32 fm_rx_set_mute_mode(struct fmdev *, u8);
+u32 fm_rx_set_stereo_mono(struct fmdev *, u16);
+u32 fm_rx_set_rds_mode(struct fmdev *, u8);
+u32 fm_rx_set_rds_system(struct fmdev *, u8);
+u32 fm_rx_set_volume(struct fmdev *, u16);
+u32 fm_rx_set_rssi_threshold(struct fmdev *, short);
+u32 fm_rx_set_region(struct fmdev *, u8);
+u32 fm_rx_set_rfdepend_softmute(struct fmdev *, u8);
+u32 fm_rx_set_deemphasis_mode(struct fmdev *, u16);
+u32 fm_rx_set_af_switch(struct fmdev *, u8);
+
+void fm_rx_reset_rds_cache(struct fmdev *);
+void fm_rx_reset_station_info(struct fmdev *);
+
+u32 fm_rx_seek(struct fmdev *, u32, u32, u32);
+
+u32 fm_rx_get_rds_mode(struct fmdev *, u8 *);
+u32 fm_rx_get_rds_system(struct fmdev *, u8 *);
+u32 fm_rx_get_mute_mode(struct fmdev *, u8 *);
+u32 fm_rx_get_volume(struct fmdev *, u16 *);
+u32 fm_rx_get_band_freq_range(struct fmdev *,
+					u32 *, u32 *);
+u32 fm_rx_get_stereo_mono(struct fmdev *, u16 *);
+u32 fm_rx_get_rssi_level(struct fmdev *, u16 *);
+u32 fm_rx_get_rssi_threshold(struct fmdev *, short *);
+u32 fm_rx_get_rfdepend_softmute(struct fmdev *, u8 *);
+u32 fm_rx_get_deemph_mode(struct fmdev *, u16 *);
+u32 fm_rx_get_af_switch(struct fmdev *, u8 *);
+void fm_rx_get_region(struct fmdev *, u8 *);
+
+u32 fm_rx_set_chanl_spacing(struct fmdev *, u8);
+u32 fm_rx_get_chanl_spacing(struct fmdev *, u8 *);
+#endif
+