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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for Dummy Frontend4 *5 * Written by Emard <emard@softhome.net>6 */7 8#include <linux/module.h>9#include <linux/init.h>10#include <linux/string.h>11#include <linux/slab.h>12 13#include <media/dvb_frontend.h>14#include "ddbridge-dummy-fe.h"15 16struct ddbridge_dummy_fe_state {17 struct dvb_frontend frontend;18};19 20static int ddbridge_dummy_fe_read_status(struct dvb_frontend *fe,21 enum fe_status *status)22{23 *status = FE_HAS_SIGNAL24 | FE_HAS_CARRIER25 | FE_HAS_VITERBI26 | FE_HAS_SYNC27 | FE_HAS_LOCK;28 29 return 0;30}31 32static int ddbridge_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber)33{34 *ber = 0;35 return 0;36}37 38static int ddbridge_dummy_fe_read_signal_strength(struct dvb_frontend *fe,39 u16 *strength)40{41 *strength = 0;42 return 0;43}44 45static int ddbridge_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr)46{47 *snr = 0;48 return 0;49}50 51static int ddbridge_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)52{53 *ucblocks = 0;54 return 0;55}56 57/*58 * Should only be implemented if it actually reads something from the hardware.59 * Also, it should check for the locks, in order to avoid report wrong data60 * to userspace.61 */62static int ddbridge_dummy_fe_get_frontend(struct dvb_frontend *fe,63 struct dtv_frontend_properties *p)64{65 return 0;66}67 68static int ddbridge_dummy_fe_set_frontend(struct dvb_frontend *fe)69{70 if (fe->ops.tuner_ops.set_params) {71 fe->ops.tuner_ops.set_params(fe);72 if (fe->ops.i2c_gate_ctrl)73 fe->ops.i2c_gate_ctrl(fe, 0);74 }75 76 return 0;77}78 79static int ddbridge_dummy_fe_sleep(struct dvb_frontend *fe)80{81 return 0;82}83 84static int ddbridge_dummy_fe_init(struct dvb_frontend *fe)85{86 return 0;87}88 89static void ddbridge_dummy_fe_release(struct dvb_frontend *fe)90{91 struct ddbridge_dummy_fe_state *state = fe->demodulator_priv;92 93 kfree(state);94}95 96static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops;97 98struct dvb_frontend *ddbridge_dummy_fe_qam_attach(void)99{100 struct ddbridge_dummy_fe_state *state = NULL;101 102 /* allocate memory for the internal state */103 state = kzalloc(sizeof(struct ddbridge_dummy_fe_state), GFP_KERNEL);104 if (!state)105 return NULL;106 107 /* create dvb_frontend */108 memcpy(&state->frontend.ops,109 &ddbridge_dummy_fe_qam_ops,110 sizeof(struct dvb_frontend_ops));111 112 state->frontend.demodulator_priv = state;113 return &state->frontend;114}115EXPORT_SYMBOL_GPL(ddbridge_dummy_fe_qam_attach);116 117static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops = {118 .delsys = { SYS_DVBC_ANNEX_A },119 .info = {120 .name = "ddbridge dummy DVB-C",121 .frequency_min_hz = 51 * MHz,122 .frequency_max_hz = 858 * MHz,123 .frequency_stepsize_hz = 62500,124 /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */125 .symbol_rate_min = (57840000 / 2) / 64,126 .symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */127 .caps = FE_CAN_QAM_16 |128 FE_CAN_QAM_32 |129 FE_CAN_QAM_64 |130 FE_CAN_QAM_128 |131 FE_CAN_QAM_256 |132 FE_CAN_FEC_AUTO |133 FE_CAN_INVERSION_AUTO134 },135 136 .release = ddbridge_dummy_fe_release,137 138 .init = ddbridge_dummy_fe_init,139 .sleep = ddbridge_dummy_fe_sleep,140 141 .set_frontend = ddbridge_dummy_fe_set_frontend,142 .get_frontend = ddbridge_dummy_fe_get_frontend,143 144 .read_status = ddbridge_dummy_fe_read_status,145 .read_ber = ddbridge_dummy_fe_read_ber,146 .read_signal_strength = ddbridge_dummy_fe_read_signal_strength,147 .read_snr = ddbridge_dummy_fe_read_snr,148 .read_ucblocks = ddbridge_dummy_fe_read_ucblocks,149};150 151MODULE_DESCRIPTION("ddbridge dummy Frontend");152MODULE_AUTHOR("Emard");153MODULE_LICENSE("GPL");154