radio-si470x-common.c

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/*
 *  drivers/media/radio/si470x/radio-si470x-common.c
 *
 *  Driver for radios with Silicon Labs Si470x FM Radio Receivers
 *
 *  Copyright (c) 2009 Tobias Lorenz <[email protected]>
 *  Copyright (c) 2012 Hans de Goede <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 */


/*
 * History:
 * 2008-01-12   Tobias Lorenz <[email protected]>
 *      Version 1.0.0
 *      - First working version
 * 2008-01-13   Tobias Lorenz <[email protected]>
 *      Version 1.0.1
 *      - Improved error handling, every function now returns errno
 *      - Improved multi user access (start/mute/stop)
 *      - Channel doesn't get lost anymore after start/mute/stop
 *      - RDS support added (polling mode via interrupt EP 1)
 *      - marked default module parameters with *value*
 *      - switched from bit structs to bit masks
 *      - header file cleaned and integrated
 * 2008-01-14   Tobias Lorenz <[email protected]>
 *      Version 1.0.2
 *      - hex values are now lower case
 *      - commented USB ID for ADS/Tech moved on todo list
 *      - blacklisted si470x in hid-quirks.c
 *      - rds buffer handling functions integrated into *_work, *_read
 *      - rds_command in si470x_poll exchanged against simple retval
 *      - check for firmware version 15
 *      - code order and prototypes still remain the same
 *      - spacing and bottom of band codes remain the same
 * 2008-01-16   Tobias Lorenz <[email protected]>
 *      Version 1.0.3
 *      - code reordered to avoid function prototypes
 *      - switch/case defaults are now more user-friendly
 *      - unified comment style
 *      - applied all checkpatch.pl v1.12 suggestions
 *        except the warning about the too long lines with bit comments
 *      - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
 * 2008-01-22   Tobias Lorenz <[email protected]>
 *      Version 1.0.4
 *      - avoid poss. locking when doing copy_to_user which may sleep
 *      - RDS is automatically activated on read now
 *      - code cleaned of unnecessary rds_commands
 *      - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
 *        (thanks to Guillaume RAMOUSSE)
 * 2008-01-27   Tobias Lorenz <[email protected]>
 *      Version 1.0.5
 *      - number of seek_retries changed to tune_timeout
 *      - fixed problem with incomplete tune operations by own buffers
 *      - optimization of variables and printf types
 *      - improved error logging
 * 2008-01-31   Tobias Lorenz <[email protected]>
 *      Oliver Neukum <[email protected]>
 *      Version 1.0.6
 *      - fixed coverity checker warnings in *_usb_driver_disconnect
 *      - probe()/open() race by correct ordering in probe()
 *      - DMA coherency rules by separate allocation of all buffers
 *      - use of endianness macros
 *      - abuse of spinlock, replaced by mutex
 *      - racy handling of timer in disconnect,
 *        replaced by delayed_work
 *      - racy interruptible_sleep_on(),
 *        replaced with wait_event_interruptible()
 *      - handle signals in read()
 * 2008-02-08   Tobias Lorenz <[email protected]>
 *      Oliver Neukum <[email protected]>
 *      Version 1.0.7
 *      - usb autosuspend support
 *      - unplugging fixed
 * 2008-05-07   Tobias Lorenz <[email protected]>
 *      Version 1.0.8
 *      - hardware frequency seek support
 *      - afc indication
 *      - more safety checks, let si470x_get_freq return errno
 *      - vidioc behavior corrected according to v4l2 spec
 * 2008-10-20   Alexey Klimov <[email protected]>
 *      - add support for KWorld USB FM Radio FM700
 *      - blacklisted KWorld radio in hid-core.c and hid-ids.h
 * 2008-12-03   Mark Lord <[email protected]>
 *      - add support for DealExtreme USB Radio
 * 2009-01-31   Bob Ross <[email protected]>
 *      - correction of stereo detection/setting
 *      - correction of signal strength indicator scaling
 * 2009-01-31   Rick Bronson <[email protected]>
 *      Tobias Lorenz <[email protected]>
 *      - add LED status output
 *      - get HW/SW version from scratchpad
 * 2009-06-16   Edouard Lafargue <[email protected]>
 *      Version 1.0.10
 *      - add support for interrupt mode for RDS endpoint,
 *                instead of polling.
 *                Improves RDS reception significantly
 */


/* kernel includes */
#include "radio-si470x.h"



/**************************************************************************
 * Module Parameters
 **************************************************************************/

/* Spacing (kHz) */
/* 0: 200 kHz (USA, Australia) */
/* 1: 100 kHz (Europe, Japan) */
/* 2:  50 kHz */
static unsigned short space = 2;
module_param(space, ushort, 0444);
MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");

/* De-emphasis */
/* 0: 75 us (USA) */
/* 1: 50 us (Europe, Australia, Japan) */
static unsigned short de = 1;
module_param(de, ushort, 0444);
MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");

/* Tune timeout */
static unsigned int tune_timeout = 3000;
module_param(tune_timeout, uint, 0644);
MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");

/* Seek timeout */
static unsigned int seek_timeout = 5000;
module_param(seek_timeout, uint, 0644);
MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");

static const struct v4l2_frequency_band bands[] = {
    {
        .type = V4L2_TUNER_RADIO,
        .index = 0,
        .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
                V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
                V4L2_TUNER_CAP_FREQ_BANDS |
                V4L2_TUNER_CAP_HWSEEK_BOUNDED |
                V4L2_TUNER_CAP_HWSEEK_WRAP,
        .rangelow   =  87500 * 16,
        .rangehigh  = 108000 * 16,
        .modulation = V4L2_BAND_MODULATION_FM,
    },
    {
        .type = V4L2_TUNER_RADIO,
        .index = 1,
        .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
                V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
                V4L2_TUNER_CAP_FREQ_BANDS |
                V4L2_TUNER_CAP_HWSEEK_BOUNDED |
                V4L2_TUNER_CAP_HWSEEK_WRAP,
        .rangelow   =  76000 * 16,
        .rangehigh  = 108000 * 16,
        .modulation = V4L2_BAND_MODULATION_FM,
    },
    {
        .type = V4L2_TUNER_RADIO,
        .index = 2,
        .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
                V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
                V4L2_TUNER_CAP_FREQ_BANDS |
                V4L2_TUNER_CAP_HWSEEK_BOUNDED |
                V4L2_TUNER_CAP_HWSEEK_WRAP,
        .rangelow   =  76000 * 16,
        .rangehigh  =  90000 * 16,
        .modulation = V4L2_BAND_MODULATION_FM,
    },
};

/**************************************************************************
 * Generic Functions
 **************************************************************************/

/*
 * si470x_set_band - set the band
 */
static int si470x_set_band(struct si470x_device *radio, int band)
{
    if (radio->band == band)
        return 0;

    radio->band = band;
    radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
    radio->registers[SYSCONFIG2] |= radio->band << 6;
    return si470x_set_register(radio, SYSCONFIG2);
}

/*
 * si470x_set_chan - set the channel
 */
static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
{
    int retval;
    bool timed_out = 0;

    /* start tuning */
    radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
    radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
    retval = si470x_set_register(radio, CHANNEL);
    if (retval < 0)
        goto done;

    /* wait till tune operation has completed */
    INIT_COMPLETION(radio->completion);
    retval = wait_for_completion_timeout(&radio->completion,
            msecs_to_jiffies(tune_timeout));
    if (!retval)
        timed_out = true;

    if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
        dev_warn(&radio->videodev.dev, "tune does not complete\n");
    if (timed_out)
        dev_warn(&radio->videodev.dev,
            "tune timed out after %u ms\n", tune_timeout);

    /* stop tuning */
    radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
    retval = si470x_set_register(radio, CHANNEL);

done:
    return retval;
}

/*
 * si470x_get_step - get channel spacing
 */
static unsigned int si470x_get_step(struct si470x_device *radio)
{
    /* Spacing (kHz) */
    switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
    /* 0: 200 kHz (USA, Australia) */
    case 0:
        return 200 * 16;
    /* 1: 100 kHz (Europe, Japan) */
    case 1:
        return 100 * 16;
    /* 2:  50 kHz */
    default:
        return 50 * 16;
    };
}


/*
 * si470x_get_freq - get the frequency
 */
static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
{
    int chan, retval;

    /* read channel */
    retval = si470x_get_register(radio, READCHAN);
    chan = radio->registers[READCHAN] & READCHAN_READCHAN;

    /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
    *freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow;

    return retval;
}


/*
 * si470x_set_freq - set the frequency
 */
int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
{
    unsigned short chan;

    freq = clamp(freq, bands[radio->band].rangelow,
               bands[radio->band].rangehigh);
    /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
    chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);

    return si470x_set_chan(radio, chan);
}


/*
 * si470x_set_seek - set seek
 */
static int si470x_set_seek(struct si470x_device *radio,
               const struct v4l2_hw_freq_seek *seek)
{
    int band, retval;
    unsigned int freq;
    bool timed_out = 0;

    /* set band */
    if (seek->rangelow || seek->rangehigh) {
        for (band = 0; band < ARRAY_SIZE(bands); band++) {
            if (bands[band].rangelow  == seek->rangelow &&
                bands[band].rangehigh == seek->rangehigh)
                break;
        }
        if (band == ARRAY_SIZE(bands))
            return -EINVAL; /* No matching band found */
    } else
        band = 1; /* If nothing is specified seek 76 - 108 Mhz */

    if (radio->band != band) {
        retval = si470x_get_freq(radio, &freq);
        if (retval)
            return retval;
        retval = si470x_set_band(radio, band);
        if (retval)
            return retval;
        retval = si470x_set_freq(radio, freq);
        if (retval)
            return retval;
    }

    /* start seeking */
    radio->registers[POWERCFG] |= POWERCFG_SEEK;
    if (seek->wrap_around)
        radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
    else
        radio->registers[POWERCFG] |= POWERCFG_SKMODE;
    if (seek->seek_upward)
        radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
    else
        radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
    retval = si470x_set_register(radio, POWERCFG);
    if (retval < 0)
        return retval;

    /* wait till tune operation has completed */
    INIT_COMPLETION(radio->completion);
    retval = wait_for_completion_timeout(&radio->completion,
            msecs_to_jiffies(seek_timeout));
    if (!retval)
        timed_out = true;

    if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
        dev_warn(&radio->videodev.dev, "seek does not complete\n");
    if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
        dev_warn(&radio->videodev.dev,
            "seek failed / band limit reached\n");

    /* stop seeking */
    radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
    retval = si470x_set_register(radio, POWERCFG);

    /* try again, if timed out */
    if (retval == 0 && timed_out)
        return -ENODATA;
    return retval;
}


/*
 * si470x_start - switch on radio
 */
int si470x_start(struct si470x_device *radio)
{
    int retval;

    /* powercfg */
    radio->registers[POWERCFG] =
        POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
    retval = si470x_set_register(radio, POWERCFG);
    if (retval < 0)
        goto done;

    /* sysconfig 1 */
    radio->registers[SYSCONFIG1] =
        (de << 11) & SYSCONFIG1_DE;     /* DE*/
    retval = si470x_set_register(radio, SYSCONFIG1);
    if (retval < 0)
        goto done;

    /* sysconfig 2 */
    radio->registers[SYSCONFIG2] =
        (0x1f  << 8) |              /* SEEKTH */
        ((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
        ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
        15;                 /* VOLUME (max) */
    retval = si470x_set_register(radio, SYSCONFIG2);
    if (retval < 0)
        goto done;

    /* reset last channel */
    retval = si470x_set_chan(radio,
        radio->registers[CHANNEL] & CHANNEL_CHAN);

done:
    return retval;
}


/*
 * si470x_stop - switch off radio
 */
int si470x_stop(struct si470x_device *radio)
{
    int retval;

    /* sysconfig 1 */
    radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
    retval = si470x_set_register(radio, SYSCONFIG1);
    if (retval < 0)
        goto done;

    /* powercfg */
    radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
    /* POWERCFG_ENABLE has to automatically go low */
    radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
    retval = si470x_set_register(radio, POWERCFG);

done:
    return retval;
}


/*
 * si470x_rds_on - switch on rds reception
 */
static int si470x_rds_on(struct si470x_device *radio)
{
    int retval;

    /* sysconfig 1 */
    radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
    retval = si470x_set_register(radio, SYSCONFIG1);
    if (retval < 0)
        radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;

    return retval;
}



/**************************************************************************
 * File Operations Interface
 **************************************************************************/

/*
 * si470x_fops_read - read RDS data
 */
static ssize_t si470x_fops_read(struct file *file, char __user *buf,
        size_t count, loff_t *ppos)
{
    struct si470x_device *radio = video_drvdata(file);
    int retval = 0;
    unsigned int block_count = 0;

    /* switch on rds reception */
    if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
        si470x_rds_on(radio);

    /* block if no new data available */
    while (radio->wr_index == radio->rd_index) {
        if (file->f_flags & O_NONBLOCK) {
            retval = -EWOULDBLOCK;
            goto done;
        }
        if (wait_event_interruptible(radio->read_queue,
            radio->wr_index != radio->rd_index) < 0) {
            retval = -EINTR;
            goto done;
        }
    }

    /* calculate block count from byte count */
    count /= 3;

    /* copy RDS block out of internal buffer and to user buffer */
    while (block_count < count) {
        if (radio->rd_index == radio->wr_index)
            break;

        /* always transfer rds complete blocks */
        if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
            /* retval = -EFAULT; */
            break;

        /* increment and wrap read pointer */
        radio->rd_index += 3;
        if (radio->rd_index >= radio->buf_size)
            radio->rd_index = 0;

        /* increment counters */
        block_count++;
        buf += 3;
        retval += 3;
    }

done:
    return retval;
}


/*
 * si470x_fops_poll - poll RDS data
 */
static unsigned int si470x_fops_poll(struct file *file,
        struct poll_table_struct *pts)
{
    struct si470x_device *radio = video_drvdata(file);
    unsigned long req_events = poll_requested_events(pts);
    int retval = v4l2_ctrl_poll(file, pts);

    if (req_events & (POLLIN | POLLRDNORM)) {
        /* switch on rds reception */
        if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
            si470x_rds_on(radio);

        poll_wait(file, &radio->read_queue, pts);

        if (radio->rd_index != radio->wr_index)
            retval |= POLLIN | POLLRDNORM;
    }

    return retval;
}


/*
 * si470x_fops - file operations interface
 */
static const struct v4l2_file_operations si470x_fops = {
    .owner          = THIS_MODULE,
    .read           = si470x_fops_read,
    .poll           = si470x_fops_poll,
    .unlocked_ioctl     = video_ioctl2,
    .open           = si470x_fops_open,
    .release        = si470x_fops_release,
};



/**************************************************************************
 * Video4Linux Interface
 **************************************************************************/


static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
{
    struct si470x_device *radio =
        container_of(ctrl->handler, struct si470x_device, hdl);

    switch (ctrl->id) {
    case V4L2_CID_AUDIO_VOLUME:
        radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
        radio->registers[SYSCONFIG2] |= ctrl->val;
        return si470x_set_register(radio, SYSCONFIG2);
    case V4L2_CID_AUDIO_MUTE:
        if (ctrl->val)
            radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
        else
            radio->registers[POWERCFG] |= POWERCFG_DMUTE;
        return si470x_set_register(radio, POWERCFG);
    default:
        return -EINVAL;
    }
}


/*
 * si470x_vidioc_g_tuner - get tuner attributes
 */
static int si470x_vidioc_g_tuner(struct file *file, void *priv,
        struct v4l2_tuner *tuner)
{
    struct si470x_device *radio = video_drvdata(file);
    int retval = 0;

    if (tuner->index != 0)
        return -EINVAL;

    if (!radio->status_rssi_auto_update) {
        retval = si470x_get_register(radio, STATUSRSSI);
        if (retval < 0)
            return retval;
    }

    /* driver constants */
    strcpy(tuner->name, "FM");
    tuner->type = V4L2_TUNER_RADIO;
    tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
                V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO |
                V4L2_TUNER_CAP_HWSEEK_BOUNDED |
                V4L2_TUNER_CAP_HWSEEK_WRAP;
    tuner->rangelow  =  76 * FREQ_MUL;
    tuner->rangehigh = 108 * FREQ_MUL;

    /* stereo indicator == stereo (instead of mono) */
    if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
        tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
    else
        tuner->rxsubchans = V4L2_TUNER_SUB_STEREO;
    /* If there is a reliable method of detecting an RDS channel,
       then this code should check for that before setting this
       RDS subchannel. */
    tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;

    /* mono/stereo selector */
    if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
        tuner->audmode = V4L2_TUNER_MODE_STEREO;
    else
        tuner->audmode = V4L2_TUNER_MODE_MONO;

    /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
    /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
    tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
    /* the ideal factor is 0xffff/75 = 873,8 */
    tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
    if (tuner->signal > 0xffff)
        tuner->signal = 0xffff;

    /* automatic frequency control: -1: freq to low, 1 freq to high */
    /* AFCRL does only indicate that freq. differs, not if too low/high */
    tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;

    return retval;
}


/*
 * si470x_vidioc_s_tuner - set tuner attributes
 */
static int si470x_vidioc_s_tuner(struct file *file, void *priv,
        struct v4l2_tuner *tuner)
{
    struct si470x_device *radio = video_drvdata(file);

    if (tuner->index != 0)
        return -EINVAL;

    /* mono/stereo selector */
    switch (tuner->audmode) {
    case V4L2_TUNER_MODE_MONO:
        radio->registers[POWERCFG] |= POWERCFG_MONO;  /* force mono */
        break;
    case V4L2_TUNER_MODE_STEREO:
    default:
        radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
        break;
    }

    return si470x_set_register(radio, POWERCFG);
}


/*
 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
 */
static int si470x_vidioc_g_frequency(struct file *file, void *priv,
        struct v4l2_frequency *freq)
{
    struct si470x_device *radio = video_drvdata(file);

    if (freq->tuner != 0)
        return -EINVAL;

    freq->type = V4L2_TUNER_RADIO;
    return si470x_get_freq(radio, &freq->frequency);
}


/*
 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
 */
static int si470x_vidioc_s_frequency(struct file *file, void *priv,
        struct v4l2_frequency *freq)
{
    struct si470x_device *radio = video_drvdata(file);
    int retval;

    if (freq->tuner != 0)
        return -EINVAL;

    if (freq->frequency < bands[radio->band].rangelow ||
        freq->frequency > bands[radio->band].rangehigh) {
        /* Switch to band 1 which covers everything we support */
        retval = si470x_set_band(radio, 1);
        if (retval)
            return retval;
    }
    return si470x_set_freq(radio, freq->frequency);
}


/*
 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
 */
static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
        const struct v4l2_hw_freq_seek *seek)
{
    struct si470x_device *radio = video_drvdata(file);

    if (seek->tuner != 0)
        return -EINVAL;

    if (file->f_flags & O_NONBLOCK)
        return -EWOULDBLOCK;

    return si470x_set_seek(radio, seek);
}

/*
 * si470x_vidioc_enum_freq_bands - enumerate supported bands
 */
static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
                     struct v4l2_frequency_band *band)
{
    if (band->tuner != 0)
        return -EINVAL;
    if (band->index >= ARRAY_SIZE(bands))
        return -EINVAL;
    *band = bands[band->index];
    return 0;
}

const struct v4l2_ctrl_ops si470x_ctrl_ops = {
    .s_ctrl = si470x_s_ctrl,
};

/*
 * si470x_ioctl_ops - video device ioctl operations
 */
static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
    .vidioc_querycap    = si470x_vidioc_querycap,
    .vidioc_g_tuner     = si470x_vidioc_g_tuner,
    .vidioc_s_tuner     = si470x_vidioc_s_tuner,
    .vidioc_g_frequency = si470x_vidioc_g_frequency,
    .vidioc_s_frequency = si470x_vidioc_s_frequency,
    .vidioc_s_hw_freq_seek  = si470x_vidioc_s_hw_freq_seek,
    .vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands,
    .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
    .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};


/*
 * si470x_viddev_template - video device interface
 */
struct video_device si470x_viddev_template = {
    .fops           = &si470x_fops,
    .name           = DRIVER_NAME,
    .release        = video_device_release_empty,
    .ioctl_ops      = &si470x_ioctl_ops,
};