// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for Dummy Frontend
 *
 *  Written by Emard <emard@softhome.net>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <media/dvb_frontend.h>
#include "ddbridge-dummy-fe.h"

struct ddbridge_dummy_fe_state {
        struct dvb_frontend frontend;
};

static int ddbridge_dummy_fe_read_status(struct dvb_frontend *fe,
                                    enum fe_status *status)
{
        *status = FE_HAS_SIGNAL
                | FE_HAS_CARRIER
                | FE_HAS_VITERBI
                | FE_HAS_SYNC
                | FE_HAS_LOCK;

        return 0;
}

static int ddbridge_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
{
        *ber = 0;
        return 0;
}

static int ddbridge_dummy_fe_read_signal_strength(struct dvb_frontend *fe,
                                             u16 *strength)
{
        *strength = 0;
        return 0;
}

static int ddbridge_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
{
        *snr = 0;
        return 0;
}

static int ddbridge_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
        *ucblocks = 0;
        return 0;
}

/*
 * Should only be implemented if it actually reads something from the hardware.
 * Also, it should check for the locks, in order to avoid report wrong data
 * to userspace.
 */
static int ddbridge_dummy_fe_get_frontend(struct dvb_frontend *fe,
                                     struct dtv_frontend_properties *p)
{
        return 0;
}

static int ddbridge_dummy_fe_set_frontend(struct dvb_frontend *fe)
{
        if (fe->ops.tuner_ops.set_params) {
                fe->ops.tuner_ops.set_params(fe);
                if (fe->ops.i2c_gate_ctrl)
                        fe->ops.i2c_gate_ctrl(fe, 0);
        }

        return 0;
}

static int ddbridge_dummy_fe_sleep(struct dvb_frontend *fe)
{
        return 0;
}

static int ddbridge_dummy_fe_init(struct dvb_frontend *fe)
{
        return 0;
}

static void ddbridge_dummy_fe_release(struct dvb_frontend *fe)
{
        struct ddbridge_dummy_fe_state *state = fe->demodulator_priv;

        kfree(state);
}

static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops;

struct dvb_frontend *ddbridge_dummy_fe_qam_attach(void)
{
        struct ddbridge_dummy_fe_state *state = NULL;

        /* allocate memory for the internal state */
        state = kzalloc_obj(struct ddbridge_dummy_fe_state);
        if (!state)
                return NULL;

        /* create dvb_frontend */
        memcpy(&state->frontend.ops,
               &ddbridge_dummy_fe_qam_ops,
               sizeof(struct dvb_frontend_ops));

        state->frontend.demodulator_priv = state;
        return &state->frontend;
}
EXPORT_SYMBOL_GPL(ddbridge_dummy_fe_qam_attach);

static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops = {
        .delsys = { SYS_DVBC_ANNEX_A },
        .info = {
                .name                   = "ddbridge dummy DVB-C",
                .frequency_min_hz       =  51 * MHz,
                .frequency_max_hz       = 858 * MHz,
                .frequency_stepsize_hz  = 62500,
                /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */
                .symbol_rate_min        = (57840000 / 2) / 64,
                .symbol_rate_max        = (57840000 / 2) / 4,   /* SACLK/4 */
                .caps = FE_CAN_QAM_16 |
                        FE_CAN_QAM_32 |
                        FE_CAN_QAM_64 |
                        FE_CAN_QAM_128 |
                        FE_CAN_QAM_256 |
                        FE_CAN_FEC_AUTO |
                        FE_CAN_INVERSION_AUTO
        },

        .release = ddbridge_dummy_fe_release,

        .init = ddbridge_dummy_fe_init,
        .sleep = ddbridge_dummy_fe_sleep,

        .set_frontend = ddbridge_dummy_fe_set_frontend,
        .get_frontend = ddbridge_dummy_fe_get_frontend,

        .read_status = ddbridge_dummy_fe_read_status,
        .read_ber = ddbridge_dummy_fe_read_ber,
        .read_signal_strength = ddbridge_dummy_fe_read_signal_strength,
        .read_snr = ddbridge_dummy_fe_read_snr,
        .read_ucblocks = ddbridge_dummy_fe_read_ucblocks,
};

MODULE_DESCRIPTION("ddbridge dummy Frontend");
MODULE_AUTHOR("Emard");
MODULE_LICENSE("GPL");