fmdrv_tx.c

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/*
 *  FM Driver for Connectivity chip of Texas Instruments.
 *  This sub-module of FM driver implements FM TX functionality.
 *
 *  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
 *
 */

#include <linux/delay.h>
#include "fmdrv.h"
#include "fmdrv_common.h"
#include "fmdrv_tx.h"

int fm_tx_set_stereo_mono(struct fmdev *fmdev, u16 mode)
{
    u16 payload;
    int ret;

    if (fmdev->tx_data.aud_mode == mode)
        return 0;

    fmdbg("stereo mode: %d\n", mode);

    /* Set Stereo/Mono mode */
    payload = (1 - mode);
    ret = fmc_send_cmd(fmdev, MONO_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    fmdev->tx_data.aud_mode = mode;

    return ret;
}

static int set_rds_text(struct fmdev *fmdev, u8 *rds_text)
{
    u16 payload;
    int ret;

    ret = fmc_send_cmd(fmdev, RDS_DATA_SET, REG_WR, rds_text,
            strlen(rds_text), NULL, NULL);
    if (ret < 0)
        return ret;

    /* Scroll mode */
    payload = (u16)0x1;
    ret = fmc_send_cmd(fmdev, DISPLAY_MODE, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    return 0;
}

static int set_rds_data_mode(struct fmdev *fmdev, u8 mode)
{
    u16 payload;
    int ret;

    /* Setting unique PI TODO: how unique? */
    payload = (u16)0xcafe;
    ret = fmc_send_cmd(fmdev, PI_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* Set decoder id */
    payload = (u16)0xa;
    ret = fmc_send_cmd(fmdev, DI_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* TODO: RDS_MODE_GET? */
    return 0;
}

static int set_rds_len(struct fmdev *fmdev, u8 type, u16 len)
{
    u16 payload;
    int ret;

    len |= type << 8;
    payload = len;
    ret = fmc_send_cmd(fmdev, RDS_CONFIG_DATA_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* TODO: LENGTH_GET? */
    return 0;
}

int fm_tx_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
{
    u16 payload;
    int ret;
    u8 rds_text[] = "Zoom2\n";

    fmdbg("rds_en_dis:%d(E:%d, D:%d)\n", rds_en_dis,
           FM_RDS_ENABLE, FM_RDS_DISABLE);

    if (rds_en_dis == FM_RDS_ENABLE) {
        /* Set RDS length */
        set_rds_len(fmdev, 0, strlen(rds_text));

        /* Set RDS text */
        set_rds_text(fmdev, rds_text);

        /* Set RDS mode */
        set_rds_data_mode(fmdev, 0x0);
    }

    /* Send command to enable RDS */
    if (rds_en_dis == FM_RDS_ENABLE)
        payload = 0x01;
    else
        payload = 0x00;

    ret = fmc_send_cmd(fmdev, RDS_DATA_ENB, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    if (rds_en_dis == FM_RDS_ENABLE) {
        /* Set RDS length */
        set_rds_len(fmdev, 0, strlen(rds_text));

        /* Set RDS text */
        set_rds_text(fmdev, rds_text);
    }
    fmdev->tx_data.rds.flag = rds_en_dis;

    return 0;
}

int fm_tx_set_radio_text(struct fmdev *fmdev, u8 *rds_text, u8 rds_type)
{
    u16 payload;
    int ret;

    if (fmdev->curr_fmmode != FM_MODE_TX)
        return -EPERM;

    fm_tx_set_rds_mode(fmdev, 0);

    /* Set RDS length */
    set_rds_len(fmdev, rds_type, strlen(rds_text));

    /* Set RDS text */
    set_rds_text(fmdev, rds_text);

    /* Set RDS mode */
    set_rds_data_mode(fmdev, 0x0);

    payload = 1;
    ret = fmc_send_cmd(fmdev, RDS_DATA_ENB, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    return 0;
}

int fm_tx_set_af(struct fmdev *fmdev, u32 af)
{
    u16 payload;
    int ret;

    if (fmdev->curr_fmmode != FM_MODE_TX)
        return -EPERM;

    fmdbg("AF: %d\n", af);

    af = (af - 87500) / 100;
    payload = (u16)af;
    ret = fmc_send_cmd(fmdev, TA_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    return 0;
}

int fm_tx_set_region(struct fmdev *fmdev, u8 region)
{
    u16 payload;
    int ret;

    if (region != FM_BAND_EUROPE_US && region != FM_BAND_JAPAN) {
        fmerr("Invalid band\n");
        return -EINVAL;
    }

    /* Send command to set the band */
    payload = (u16)region;
    ret = fmc_send_cmd(fmdev, TX_BAND_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    return 0;
}

int fm_tx_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
{
    u16 payload;
    int ret;

    fmdbg("tx: mute mode %d\n", mute_mode_toset);

    payload = mute_mode_toset;
    ret = fmc_send_cmd(fmdev, MUTE, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    return 0;
}

/* Set TX Audio I/O */
static int set_audio_io(struct fmdev *fmdev)
{
    struct fmtx_data *tx = &fmdev->tx_data;
    u16 payload;
    int ret;

    /* Set Audio I/O Enable */
    payload = tx->audio_io;
    ret = fmc_send_cmd(fmdev, AUDIO_IO_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* TODO: is audio set? */
    return 0;
}

/* Start TX Transmission */
static int enable_xmit(struct fmdev *fmdev, u8 new_xmit_state)
{
    struct fmtx_data *tx = &fmdev->tx_data;
    unsigned long timeleft;
    u16 payload;
    int ret;

    /* Enable POWER_ENB interrupts */
    payload = FM_POW_ENB_EVENT;
    ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* Set Power Enable */
    payload = new_xmit_state;
    ret = fmc_send_cmd(fmdev, POWER_ENB_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* Wait for Power Enabled */
    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 interrupt\n",
               jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
        return -ETIMEDOUT;
    }

    set_bit(FM_CORE_TX_XMITING, &fmdev->flag);
    tx->xmit_state = new_xmit_state;

    return 0;
}

/* Set TX power level */
int fm_tx_set_pwr_lvl(struct fmdev *fmdev, u8 new_pwr_lvl)
{
    u16 payload;
    struct fmtx_data *tx = &fmdev->tx_data;
    int ret;

    if (fmdev->curr_fmmode != FM_MODE_TX)
        return -EPERM;
    fmdbg("tx: pwr_level_to_set %ld\n", (long int)new_pwr_lvl);

    /* If the core isn't ready update global variable */
    if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
        tx->pwr_lvl = new_pwr_lvl;
        return 0;
    }

    /* Set power level: Application will specify power level value in
     * units of dB/uV, whereas range and step are specific to FM chip.
     * For TI's WL chips, convert application specified power level value
     * to chip specific value by subtracting 122 from it. Refer to TI FM
     * data sheet for details.
     * */

    payload = (FM_PWR_LVL_HIGH - new_pwr_lvl);
    ret = fmc_send_cmd(fmdev, POWER_LEV_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    /* TODO: is the power level set? */
    tx->pwr_lvl = new_pwr_lvl;

    return 0;
}

/*
 * Sets FM TX pre-emphasis filter value (OFF, 50us, or 75us)
 * Convert V4L2 specified filter values to chip specific filter values.
 */
int fm_tx_set_preemph_filter(struct fmdev *fmdev, u32 preemphasis)
{
    struct fmtx_data *tx = &fmdev->tx_data;
    u16 payload;
    int ret;

    if (fmdev->curr_fmmode != FM_MODE_TX)
        return -EPERM;

    switch (preemphasis) {
    case V4L2_PREEMPHASIS_DISABLED:
        payload = FM_TX_PREEMPH_OFF;
        break;
    case V4L2_PREEMPHASIS_50_uS:
        payload = FM_TX_PREEMPH_50US;
        break;
    case V4L2_PREEMPHASIS_75_uS:
        payload = FM_TX_PREEMPH_75US;
        break;
    }

    ret = fmc_send_cmd(fmdev, PREMPH_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    tx->preemph = payload;

    return ret;
}

/* Get the TX tuning capacitor value.*/
int fm_tx_get_tune_cap_val(struct fmdev *fmdev)
{
    u16 curr_val;
    u32 resp_len;
    int ret;

    if (fmdev->curr_fmmode != FM_MODE_TX)
        return -EPERM;

    ret = fmc_send_cmd(fmdev, READ_FMANT_TUNE_VALUE, REG_RD,
            NULL, sizeof(curr_val), &curr_val, &resp_len);
    if (ret < 0)
        return ret;

    curr_val = be16_to_cpu(curr_val);

    return curr_val;
}

/* Set TX Frequency */
int fm_tx_set_freq(struct fmdev *fmdev, u32 freq_to_set)
{
    struct fmtx_data *tx = &fmdev->tx_data;
    u16 payload, chanl_index;
    int ret;

    if (test_bit(FM_CORE_TX_XMITING, &fmdev->flag)) {
        enable_xmit(fmdev, 0);
        clear_bit(FM_CORE_TX_XMITING, &fmdev->flag);
    }

    /* Enable FR, BL interrupts */
    payload = (FM_FR_EVENT | FM_BL_EVENT);
    ret = fmc_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    tx->tx_frq = (unsigned long)freq_to_set;
    fmdbg("tx: freq_to_set %ld\n", (long int)tx->tx_frq);

    chanl_index = freq_to_set / 10;

    /* Set current tuner channel */
    payload = chanl_index;
    ret = fmc_send_cmd(fmdev, CHANL_SET, REG_WR, &payload,
            sizeof(payload), NULL, NULL);
    if (ret < 0)
        return ret;

    fm_tx_set_pwr_lvl(fmdev, tx->pwr_lvl);
    fm_tx_set_preemph_filter(fmdev, tx->preemph);

    tx->audio_io = 0x01;    /* I2S */
    set_audio_io(fmdev);

    enable_xmit(fmdev, 0x01);   /* Enable transmission */

    tx->aud_mode = FM_STEREO_MODE;
    tx->rds.flag = FM_RDS_DISABLE;

    return 0;
}