154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Dummy Frontend
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*
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* Written by Emard <emard@softhome.net>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <media/dvb_frontend.h>
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#include "ddbridge-dummy-fe.h"
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struct ddbridge_dummy_fe_state {
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struct dvb_frontend frontend;
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};
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static int ddbridge_dummy_fe_read_status(struct dvb_frontend *fe,
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enum fe_status *status)
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{
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*status = FE_HAS_SIGNAL
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| FE_HAS_CARRIER
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| FE_HAS_VITERBI
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| FE_HAS_SYNC
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| FE_HAS_LOCK;
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return 0;
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}
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static int ddbridge_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
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{
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*ber = 0;
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return 0;
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}
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static int ddbridge_dummy_fe_read_signal_strength(struct dvb_frontend *fe,
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u16 *strength)
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{
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*strength = 0;
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return 0;
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}
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static int ddbridge_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
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{
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*snr = 0;
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return 0;
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}
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static int ddbridge_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
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{
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*ucblocks = 0;
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return 0;
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}
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/*
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* Should only be implemented if it actually reads something from the hardware.
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* Also, it should check for the locks, in order to avoid report wrong data
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* to userspace.
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*/
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static int ddbridge_dummy_fe_get_frontend(struct dvb_frontend *fe,
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struct dtv_frontend_properties *p)
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{
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return 0;
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}
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static int ddbridge_dummy_fe_set_frontend(struct dvb_frontend *fe)
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{
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if (fe->ops.tuner_ops.set_params) {
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fe->ops.tuner_ops.set_params(fe);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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}
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return 0;
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}
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static int ddbridge_dummy_fe_sleep(struct dvb_frontend *fe)
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{
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return 0;
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}
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static int ddbridge_dummy_fe_init(struct dvb_frontend *fe)
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{
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return 0;
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}
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static void ddbridge_dummy_fe_release(struct dvb_frontend *fe)
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{
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struct ddbridge_dummy_fe_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops;
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struct dvb_frontend *ddbridge_dummy_fe_qam_attach(void)
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{
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struct ddbridge_dummy_fe_state *state = NULL;
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/* allocate memory for the internal state */
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state = kzalloc(sizeof(struct ddbridge_dummy_fe_state), GFP_KERNEL);
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if (!state)
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return NULL;
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/* create dvb_frontend */
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memcpy(&state->frontend.ops,
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&ddbridge_dummy_fe_qam_ops,
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sizeof(struct dvb_frontend_ops));
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state->frontend.demodulator_priv = state;
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return &state->frontend;
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}
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EXPORT_SYMBOL_GPL(ddbridge_dummy_fe_qam_attach);
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static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops = {
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.delsys = { SYS_DVBC_ANNEX_A },
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.info = {
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.name = "ddbridge dummy DVB-C",
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.frequency_min_hz = 51 * MHz,
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.frequency_max_hz = 858 * MHz,
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.frequency_stepsize_hz = 62500,
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/* symbol_rate_min: SACLK/64 == (XIN/2)/64 */
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.symbol_rate_min = (57840000 / 2) / 64,
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.symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */
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.caps = FE_CAN_QAM_16 |
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FE_CAN_QAM_32 |
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FE_CAN_QAM_64 |
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FE_CAN_QAM_128 |
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FE_CAN_QAM_256 |
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FE_CAN_FEC_AUTO |
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FE_CAN_INVERSION_AUTO
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},
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.release = ddbridge_dummy_fe_release,
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.init = ddbridge_dummy_fe_init,
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.sleep = ddbridge_dummy_fe_sleep,
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.set_frontend = ddbridge_dummy_fe_set_frontend,
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.get_frontend = ddbridge_dummy_fe_get_frontend,
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.read_status = ddbridge_dummy_fe_read_status,
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.read_ber = ddbridge_dummy_fe_read_ber,
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.read_signal_strength = ddbridge_dummy_fe_read_signal_strength,
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.read_snr = ddbridge_dummy_fe_read_snr,
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.read_ucblocks = ddbridge_dummy_fe_read_ucblocks,
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};
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MODULE_DESCRIPTION("ddbridge dummy Frontend");
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MODULE_AUTHOR("Emard");
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MODULE_LICENSE("GPL");
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