fmdrv_rx.c

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/*
 *  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 <[email protected]>
 *  Author: Manjunatha Halli <[email protected]>
 *
 *  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;
}

int fm_rx_set_freq(struct fmdev *fmdev, u32 freq)
{
    unsigned long timeleft;
    u16 payload, curr_frq, intr_flag;
    u32 curr_frq_in_khz;
    u32 resp_len;
    int ret;

    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 int fm_rx_set_channel_spacing(struct fmdev *fmdev, u32 spacing)
{
    u16 payload;
    int 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;
}

int 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;
    int 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 -ENODATA;
    }

    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;
}

int fm_rx_set_volume(struct fmdev *fmdev, u16 vol_to_set)
{
    u16 payload;
    int 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 */
int 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 */
int 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) */
int fm_rx_set_region(struct fmdev *fmdev, u8 region_to_set)
{
    u16 payload;
    u32 new_frq = 0;
    int 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)*/
int 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 int fm_config_rx_mute_reg(struct fmdev *fmdev)
{
    u16 payload, muteval;
    int 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) */
int fm_rx_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
{
    u8 org_state;
    int 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 */
int 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 */
int fm_rx_set_rfdepend_softmute(struct fmdev *fmdev, u8 rfdepend_mute)
{
    u8 org_state;
    int 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 */
int fm_rx_get_rssi_level(struct fmdev *fmdev, u16 *rssilvl)
{
    u16 curr_rssi_lel;
    u32 resp_len;
    int 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
 */
int fm_rx_set_rssi_threshold(struct fmdev *fmdev, short rssi_lvl_toset)
{
    u16 payload;
    int 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 */
int 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 */
int fm_rx_set_stereo_mono(struct fmdev *fmdev, u16 mode)
{
    u16 payload;
    int 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 */
int fm_rx_get_stereo_mono(struct fmdev *fmdev, u16 *mode)
{
    u16 curr_mode;
    u32 resp_len;
    int ret;

    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) */
int fm_rx_set_deemphasis_mode(struct fmdev *fmdev, u16 mode)
{
    u16 payload;
    int 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 */
int 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 */
int fm_rx_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
{
    u16 payload;
    int 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 */
int 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) */
int fm_rx_set_rds_system(struct fmdev *fmdev, u8 rds_mode)
{
    u16 payload;
    int 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 */
int 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 */
int fm_rx_set_af_switch(struct fmdev *fmdev, u8 af_mode)
{
    u16 payload;
    int 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 */
int 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;
}