drivers/media/dvb-frontends/dvb_dummy_fe.c

// 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 "dvb_dummy_fe.h"


struct dvb_dummy_fe_state {
	struct dvb_frontend frontend;
};


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

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

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

static int dvb_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 dvb_dummy_fe_get_frontend(struct dvb_frontend *fe,
				     struct dtv_frontend_properties *p)
{
	return 0;
}

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

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

static int dvb_dummy_fe_set_tone(struct dvb_frontend *fe,
				 enum fe_sec_tone_mode tone)
{
	return 0;
}

static int dvb_dummy_fe_set_voltage(struct dvb_frontend *fe,
				    enum fe_sec_voltage voltage)
{
	return 0;
}

static void dvb_dummy_fe_release(struct dvb_frontend* fe)
{
	struct dvb_dummy_fe_state* state = fe->demodulator_priv;
	kfree(state);
}

static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops;

struct dvb_frontend* dvb_dummy_fe_ofdm_attach(void)
{
	struct dvb_dummy_fe_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
	if (!state)
		return NULL;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &dvb_dummy_fe_ofdm_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
}

static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;

struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
{
	struct dvb_dummy_fe_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
	if (!state)
		return NULL;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &dvb_dummy_fe_qpsk_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
}

static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops;

struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
{
	struct dvb_dummy_fe_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
	if (!state)
		return NULL;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &dvb_dummy_fe_qam_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
}

static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "Dummy DVB-T",
		.frequency_min_hz	= 0,
		.frequency_max_hz	= 863250 * kHz,
		.frequency_stepsize_hz	= 62500,
		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
				FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
				FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
				FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
				FE_CAN_TRANSMISSION_MODE_AUTO |
				FE_CAN_GUARD_INTERVAL_AUTO |
				FE_CAN_HIERARCHY_AUTO,
	},

	.release = dvb_dummy_fe_release,

	.init = dvb_dummy_fe_init,
	.sleep = dvb_dummy_fe_sleep,

	.set_frontend = dvb_dummy_fe_set_frontend,
	.get_frontend = dvb_dummy_fe_get_frontend,

	.read_status = dvb_dummy_fe_read_status,
	.read_ber = dvb_dummy_fe_read_ber,
	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
	.read_snr = dvb_dummy_fe_read_snr,
	.read_ucblocks = dvb_dummy_fe_read_ucblocks,
};

static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops = {
	.delsys = { SYS_DVBC_ANNEX_A },
	.info = {
		.name			= "Dummy DVB-C",
		.frequency_min_hz	=  51 * MHz,
		.frequency_max_hz	= 858 * MHz,
		.frequency_stepsize_hz	= 62500,
		.symbol_rate_min	= (57840000 / 2) / 64,  /* SACLK/64 == (XIN/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 = dvb_dummy_fe_release,

	.init = dvb_dummy_fe_init,
	.sleep = dvb_dummy_fe_sleep,

	.set_frontend = dvb_dummy_fe_set_frontend,
	.get_frontend = dvb_dummy_fe_get_frontend,

	.read_status = dvb_dummy_fe_read_status,
	.read_ber = dvb_dummy_fe_read_ber,
	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
	.read_snr = dvb_dummy_fe_read_snr,
	.read_ucblocks = dvb_dummy_fe_read_ucblocks,
};

static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops = {
	.delsys = { SYS_DVBS },
	.info = {
		.name			= "Dummy DVB-S",
		.frequency_min_hz	=  950 * MHz,
		.frequency_max_hz	= 2150 * MHz,
		.frequency_stepsize_hz	= 250 * kHz,
		.frequency_tolerance_hz	= 29500 * kHz,
		.symbol_rate_min	= 1000000,
		.symbol_rate_max	= 45000000,
		.caps = FE_CAN_INVERSION_AUTO |
			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
			FE_CAN_QPSK
	},

	.release = dvb_dummy_fe_release,

	.init = dvb_dummy_fe_init,
	.sleep = dvb_dummy_fe_sleep,

	.set_frontend = dvb_dummy_fe_set_frontend,
	.get_frontend = dvb_dummy_fe_get_frontend,

	.read_status = dvb_dummy_fe_read_status,
	.read_ber = dvb_dummy_fe_read_ber,
	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
	.read_snr = dvb_dummy_fe_read_snr,
	.read_ucblocks = dvb_dummy_fe_read_ucblocks,

	.set_voltage = dvb_dummy_fe_set_voltage,
	.set_tone = dvb_dummy_fe_set_tone,
};

MODULE_DESCRIPTION("DVB DUMMY Frontend");
MODULE_AUTHOR("Emard");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(dvb_dummy_fe_ofdm_attach);
EXPORT_SYMBOL(dvb_dummy_fe_qam_attach);
EXPORT_SYMBOL(dvb_dummy_fe_qpsk_attach);