1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Dummy Frontend 4 * 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 "dvb_dummy_fe.h" 15 16 17 struct dvb_dummy_fe_state { 18 struct dvb_frontend frontend; 19 }; 20 21 22 static int dvb_dummy_fe_read_status(struct dvb_frontend *fe, 23 enum fe_status *status) 24 { 25 *status = FE_HAS_SIGNAL 26 | FE_HAS_CARRIER 27 | FE_HAS_VITERBI 28 | FE_HAS_SYNC 29 | FE_HAS_LOCK; 30 31 return 0; 32 } 33 34 static int dvb_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber) 35 { 36 *ber = 0; 37 return 0; 38 } 39 40 static int dvb_dummy_fe_read_signal_strength(struct dvb_frontend *fe, 41 u16 *strength) 42 { 43 *strength = 0; 44 return 0; 45 } 46 47 static int dvb_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr) 48 { 49 *snr = 0; 50 return 0; 51 } 52 53 static int dvb_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) 54 { 55 *ucblocks = 0; 56 return 0; 57 } 58 59 /* 60 * Should only be implemented if it actually reads something from the hardware. 61 * Also, it should check for the locks, in order to avoid report wrong data 62 * to userspace. 63 */ 64 static int dvb_dummy_fe_get_frontend(struct dvb_frontend *fe, 65 struct dtv_frontend_properties *p) 66 { 67 return 0; 68 } 69 70 static int dvb_dummy_fe_set_frontend(struct dvb_frontend *fe) 71 { 72 if (fe->ops.tuner_ops.set_params) { 73 fe->ops.tuner_ops.set_params(fe); 74 if (fe->ops.i2c_gate_ctrl) 75 fe->ops.i2c_gate_ctrl(fe, 0); 76 } 77 78 return 0; 79 } 80 81 static int dvb_dummy_fe_sleep(struct dvb_frontend *fe) 82 { 83 return 0; 84 } 85 86 static int dvb_dummy_fe_init(struct dvb_frontend *fe) 87 { 88 return 0; 89 } 90 91 static int dvb_dummy_fe_set_tone(struct dvb_frontend *fe, 92 enum fe_sec_tone_mode tone) 93 { 94 return 0; 95 } 96 97 static int dvb_dummy_fe_set_voltage(struct dvb_frontend *fe, 98 enum fe_sec_voltage voltage) 99 { 100 return 0; 101 } 102 103 static void dvb_dummy_fe_release(struct dvb_frontend *fe) 104 { 105 struct dvb_dummy_fe_state *state = fe->demodulator_priv; 106 107 kfree(state); 108 } 109 110 static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops; 111 112 struct dvb_frontend *dvb_dummy_fe_ofdm_attach(void) 113 { 114 struct dvb_dummy_fe_state *state = NULL; 115 116 /* allocate memory for the internal state */ 117 state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL); 118 if (!state) 119 return NULL; 120 121 /* create dvb_frontend */ 122 memcpy(&state->frontend.ops, 123 &dvb_dummy_fe_ofdm_ops, 124 sizeof(struct dvb_frontend_ops)); 125 126 state->frontend.demodulator_priv = state; 127 return &state->frontend; 128 } 129 EXPORT_SYMBOL(dvb_dummy_fe_ofdm_attach); 130 131 static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops; 132 133 struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void) 134 { 135 struct dvb_dummy_fe_state *state = NULL; 136 137 /* allocate memory for the internal state */ 138 state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL); 139 if (!state) 140 return NULL; 141 142 /* create dvb_frontend */ 143 memcpy(&state->frontend.ops, 144 &dvb_dummy_fe_qpsk_ops, 145 sizeof(struct dvb_frontend_ops)); 146 147 state->frontend.demodulator_priv = state; 148 return &state->frontend; 149 } 150 EXPORT_SYMBOL(dvb_dummy_fe_qpsk_attach); 151 152 static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops; 153 154 struct dvb_frontend *dvb_dummy_fe_qam_attach(void) 155 { 156 struct dvb_dummy_fe_state *state = NULL; 157 158 /* allocate memory for the internal state */ 159 state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL); 160 if (!state) 161 return NULL; 162 163 /* create dvb_frontend */ 164 memcpy(&state->frontend.ops, 165 &dvb_dummy_fe_qam_ops, 166 sizeof(struct dvb_frontend_ops)); 167 168 state->frontend.demodulator_priv = state; 169 return &state->frontend; 170 } 171 EXPORT_SYMBOL(dvb_dummy_fe_qam_attach); 172 173 static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = { 174 .delsys = { SYS_DVBT }, 175 .info = { 176 .name = "Dummy DVB-T", 177 .frequency_min_hz = 0, 178 .frequency_max_hz = 863250 * kHz, 179 .frequency_stepsize_hz = 62500, 180 .caps = FE_CAN_FEC_1_2 | 181 FE_CAN_FEC_2_3 | 182 FE_CAN_FEC_3_4 | 183 FE_CAN_FEC_4_5 | 184 FE_CAN_FEC_5_6 | 185 FE_CAN_FEC_6_7 | 186 FE_CAN_FEC_7_8 | 187 FE_CAN_FEC_8_9 | 188 FE_CAN_FEC_AUTO | 189 FE_CAN_QAM_16 | 190 FE_CAN_QAM_64 | 191 FE_CAN_QAM_AUTO | 192 FE_CAN_TRANSMISSION_MODE_AUTO | 193 FE_CAN_GUARD_INTERVAL_AUTO | 194 FE_CAN_HIERARCHY_AUTO, 195 }, 196 197 .release = dvb_dummy_fe_release, 198 199 .init = dvb_dummy_fe_init, 200 .sleep = dvb_dummy_fe_sleep, 201 202 .set_frontend = dvb_dummy_fe_set_frontend, 203 .get_frontend = dvb_dummy_fe_get_frontend, 204 205 .read_status = dvb_dummy_fe_read_status, 206 .read_ber = dvb_dummy_fe_read_ber, 207 .read_signal_strength = dvb_dummy_fe_read_signal_strength, 208 .read_snr = dvb_dummy_fe_read_snr, 209 .read_ucblocks = dvb_dummy_fe_read_ucblocks, 210 }; 211 212 static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops = { 213 .delsys = { SYS_DVBC_ANNEX_A }, 214 .info = { 215 .name = "Dummy DVB-C", 216 .frequency_min_hz = 51 * MHz, 217 .frequency_max_hz = 858 * MHz, 218 .frequency_stepsize_hz = 62500, 219 /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */ 220 .symbol_rate_min = (57840000 / 2) / 64, 221 .symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */ 222 .caps = FE_CAN_QAM_16 | 223 FE_CAN_QAM_32 | 224 FE_CAN_QAM_64 | 225 FE_CAN_QAM_128 | 226 FE_CAN_QAM_256 | 227 FE_CAN_FEC_AUTO | 228 FE_CAN_INVERSION_AUTO 229 }, 230 231 .release = dvb_dummy_fe_release, 232 233 .init = dvb_dummy_fe_init, 234 .sleep = dvb_dummy_fe_sleep, 235 236 .set_frontend = dvb_dummy_fe_set_frontend, 237 .get_frontend = dvb_dummy_fe_get_frontend, 238 239 .read_status = dvb_dummy_fe_read_status, 240 .read_ber = dvb_dummy_fe_read_ber, 241 .read_signal_strength = dvb_dummy_fe_read_signal_strength, 242 .read_snr = dvb_dummy_fe_read_snr, 243 .read_ucblocks = dvb_dummy_fe_read_ucblocks, 244 }; 245 246 static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops = { 247 .delsys = { SYS_DVBS }, 248 .info = { 249 .name = "Dummy DVB-S", 250 .frequency_min_hz = 950 * MHz, 251 .frequency_max_hz = 2150 * MHz, 252 .frequency_stepsize_hz = 250 * kHz, 253 .frequency_tolerance_hz = 29500 * kHz, 254 .symbol_rate_min = 1000000, 255 .symbol_rate_max = 45000000, 256 .caps = FE_CAN_INVERSION_AUTO | 257 FE_CAN_FEC_1_2 | 258 FE_CAN_FEC_2_3 | 259 FE_CAN_FEC_3_4 | 260 FE_CAN_FEC_5_6 | 261 FE_CAN_FEC_7_8 | 262 FE_CAN_FEC_AUTO | 263 FE_CAN_QPSK 264 }, 265 266 .release = dvb_dummy_fe_release, 267 268 .init = dvb_dummy_fe_init, 269 .sleep = dvb_dummy_fe_sleep, 270 271 .set_frontend = dvb_dummy_fe_set_frontend, 272 .get_frontend = dvb_dummy_fe_get_frontend, 273 274 .read_status = dvb_dummy_fe_read_status, 275 .read_ber = dvb_dummy_fe_read_ber, 276 .read_signal_strength = dvb_dummy_fe_read_signal_strength, 277 .read_snr = dvb_dummy_fe_read_snr, 278 .read_ucblocks = dvb_dummy_fe_read_ucblocks, 279 280 .set_voltage = dvb_dummy_fe_set_voltage, 281 .set_tone = dvb_dummy_fe_set_tone, 282 }; 283 284 MODULE_DESCRIPTION("DVB DUMMY Frontend"); 285 MODULE_AUTHOR("Emard"); 286 MODULE_LICENSE("GPL"); 287