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,
  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");