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media: ddbridge: copy the dvb_dummy_fe driver to ddbridge
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As we'll be transforming the dvb-dummy-fe driver soon into a
virtual driver, let's first copy the existing one to ddbridge
as-is, as it is needed there.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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mchehab committed Apr 14, 2020
1 parent 6a79117 commit 3a137f8
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286 changes: 286 additions & 0 deletions drivers/media/pci/ddbridge/ddbridge-dummy-fe.c
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// 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;
}
EXPORT_SYMBOL(dvb_dummy_fe_ofdm_attach);

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;
}
EXPORT_SYMBOL(dvb_dummy_fe_qpsk_attach);

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;
}
EXPORT_SYMBOL(dvb_dummy_fe_qam_attach);

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: 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 = 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");
36 changes: 36 additions & 0 deletions drivers/media/pci/ddbridge/ddbridge-dummy-fe.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Driver for Dummy Frontend
*
* Written by Emard <emard@softhome.net>
*/

#ifndef DVB_DUMMY_FE_H
#define DVB_DUMMY_FE_H

#include <linux/dvb/frontend.h>
#include <media/dvb_frontend.h>

#if IS_REACHABLE(CONFIG_DVB_DUMMY_FE)
struct dvb_frontend *dvb_dummy_fe_ofdm_attach(void);
struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void);
struct dvb_frontend *dvb_dummy_fe_qam_attach(void);
#else
static inline struct dvb_frontend *dvb_dummy_fe_ofdm_attach(void)
{
pr_warn("%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
static inline struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
{
pr_warn("%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
static inline struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
{
pr_warn("%s: driver disabled by Kconfig\n", __func__);
return NULL;
}
#endif /* CONFIG_DVB_DUMMY_FE */

#endif // DVB_DUMMY_FE_H

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