drivers/media/dvb-frontends/dvb_dummy_fe.c

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