drivers/media/dvb-frontends/dvb_dummy_fe.c

   1 /*
   2  *  Driver for Dummy Frontend
   3  *
   4  *  Written by Emard <emard@softhome.net>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/string.h>
  21 #include <linux/slab.h>
  22
  23 #include <media/dvb_frontend.h>
  24 #include "dvb_dummy_fe.h"
  25
  26
  27 struct dvb_dummy_fe_state {
  28         struct dvb_frontend frontend;
  29 };
  30
  31
  32 static int dvb_dummy_fe_read_status(struct dvb_frontend *fe,
  33                                     enum fe_status *status)
  34 {
  35         *status = FE_HAS_SIGNAL
  36                 | FE_HAS_CARRIER
  37                 | FE_HAS_VITERBI
  38                 | FE_HAS_SYNC
  39                 | FE_HAS_LOCK;
  40
  41         return 0;
  42 }
  43
  44 static int dvb_dummy_fe_read_ber(struct dvb_frontend* fe, u32* ber)
  45 {
  46         *ber = 0;
  47         return 0;
  48 }
  49
  50 static int dvb_dummy_fe_read_signal_strength(struct dvb_frontend* fe, u16* strength)
  51 {
  52         *strength = 0;
  53         return 0;
  54 }
  55
  56 static int dvb_dummy_fe_read_snr(struct dvb_frontend* fe, u16* snr)
  57 {
  58         *snr = 0;
  59         return 0;
  60 }
  61
  62 static int dvb_dummy_fe_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
  63 {
  64         *ucblocks = 0;
  65         return 0;
  66 }
  67
  68 /*
  69  * Should only be implemented if it actually reads something from the hardware.
  70  * Also, it should check for the locks, in order to avoid report wrong data
  71  * to userspace.
  72  */
  73 static int dvb_dummy_fe_get_frontend(struct dvb_frontend *fe,
  74                                      struct dtv_frontend_properties *p)
  75 {
  76         return 0;
  77 }
  78
  79 static int dvb_dummy_fe_set_frontend(struct dvb_frontend *fe)
  80 {
  81         if (fe->ops.tuner_ops.set_params) {
  82                 fe->ops.tuner_ops.set_params(fe);
  83                 if (fe->ops.i2c_gate_ctrl)
  84                         fe->ops.i2c_gate_ctrl(fe, 0);
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int dvb_dummy_fe_sleep(struct dvb_frontend* fe)
  91 {
  92         return 0;
  93 }
  94
  95 static int dvb_dummy_fe_init(struct dvb_frontend* fe)
  96 {
  97         return 0;
  98 }
  99
 100 static int dvb_dummy_fe_set_tone(struct dvb_frontend *fe,
 101                                  enum fe_sec_tone_mode tone)
 102 {
 103         return 0;
 104 }
 105
 106 static int dvb_dummy_fe_set_voltage(struct dvb_frontend *fe,
 107                                     enum fe_sec_voltage voltage)
 108 {
 109         return 0;
 110 }
 111
 112 static void dvb_dummy_fe_release(struct dvb_frontend* fe)
 113 {
 114         struct dvb_dummy_fe_state* state = fe->demodulator_priv;
 115         kfree(state);
 116 }
 117
 118 static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops;
 119
 120 struct dvb_frontend* dvb_dummy_fe_ofdm_attach(void)
 121 {
 122         struct dvb_dummy_fe_state* state = NULL;
 123
 124         /* allocate memory for the internal state */
 125         state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
 126         if (!state)
 127                 return NULL;
 128
 129         /* create dvb_frontend */
 130         memcpy(&state->frontend.ops, &dvb_dummy_fe_ofdm_ops, sizeof(struct dvb_frontend_ops));
 131         state->frontend.demodulator_priv = state;
 132         return &state->frontend;
 133 }
 134
 135 static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;
 136
 137 struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
 138 {
 139         struct dvb_dummy_fe_state* state = NULL;
 140
 141         /* allocate memory for the internal state */
 142         state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
 143         if (!state)
 144                 return NULL;
 145
 146         /* create dvb_frontend */
 147         memcpy(&state->frontend.ops, &dvb_dummy_fe_qpsk_ops, sizeof(struct dvb_frontend_ops));
 148         state->frontend.demodulator_priv = state;
 149         return &state->frontend;
 150 }
 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, &dvb_dummy_fe_qam_ops, sizeof(struct dvb_frontend_ops));
 165         state->frontend.demodulator_priv = state;
 166         return &state->frontend;
 167 }
 168
 169 static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {
 170         .delsys = { SYS_DVBT },
 171         .info = {
 172                 .name                   = "Dummy DVB-T",
 173                 .frequency_min_hz       = 0,
 174                 .frequency_max_hz       = 863250 * kHz,
 175                 .frequency_stepsize_hz  = 62500,
 176                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 177                                 FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 178                                 FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 179                                 FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 180                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 181                                 FE_CAN_GUARD_INTERVAL_AUTO |
 182                                 FE_CAN_HIERARCHY_AUTO,
 183         },
 184
 185         .release = dvb_dummy_fe_release,
 186
 187         .init = dvb_dummy_fe_init,
 188         .sleep = dvb_dummy_fe_sleep,
 189
 190         .set_frontend = dvb_dummy_fe_set_frontend,
 191         .get_frontend = dvb_dummy_fe_get_frontend,
 192
 193         .read_status = dvb_dummy_fe_read_status,
 194         .read_ber = dvb_dummy_fe_read_ber,
 195         .read_signal_strength = dvb_dummy_fe_read_signal_strength,
 196         .read_snr = dvb_dummy_fe_read_snr,
 197         .read_ucblocks = dvb_dummy_fe_read_ucblocks,
 198 };
 199
 200 static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops = {
 201         .delsys = { SYS_DVBC_ANNEX_A },
 202         .info = {
 203                 .name                   = "Dummy DVB-C",
 204                 .frequency_min_hz       =  51 * MHz,
 205                 .frequency_max_hz       = 858 * MHz,
 206                 .frequency_stepsize_hz  = 62500,
 207                 .symbol_rate_min        = (57840000 / 2) / 64,  /* SACLK/64 == (XIN/2)/64 */
 208                 .symbol_rate_max        = (57840000 / 2) / 4,   /* SACLK/4 */
 209                 .caps = FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
 210                         FE_CAN_QAM_128 | FE_CAN_QAM_256 |
 211                         FE_CAN_FEC_AUTO | FE_CAN_INVERSION_AUTO
 212         },
 213
 214         .release = dvb_dummy_fe_release,
 215
 216         .init = dvb_dummy_fe_init,
 217         .sleep = dvb_dummy_fe_sleep,
 218
 219         .set_frontend = dvb_dummy_fe_set_frontend,
 220         .get_frontend = dvb_dummy_fe_get_frontend,
 221
 222         .read_status = dvb_dummy_fe_read_status,
 223         .read_ber = dvb_dummy_fe_read_ber,
 224         .read_signal_strength = dvb_dummy_fe_read_signal_strength,
 225         .read_snr = dvb_dummy_fe_read_snr,
 226         .read_ucblocks = dvb_dummy_fe_read_ucblocks,
 227 };
 228
 229 static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops = {
 230         .delsys = { SYS_DVBS },
 231         .info = {
 232                 .name                   = "Dummy DVB-S",
 233                 .frequency_min_hz       =  950 * MHz,
 234                 .frequency_max_hz       = 2150 * MHz,
 235                 .frequency_stepsize_hz  = 250 * kHz,
 236                 .frequency_tolerance_hz = 29500 * kHz,
 237                 .symbol_rate_min        = 1000000,
 238                 .symbol_rate_max        = 45000000,
 239                 .caps = FE_CAN_INVERSION_AUTO |
 240                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 241                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 242                         FE_CAN_QPSK
 243         },
 244
 245         .release = dvb_dummy_fe_release,
 246
 247         .init = dvb_dummy_fe_init,
 248         .sleep = dvb_dummy_fe_sleep,
 249
 250         .set_frontend = dvb_dummy_fe_set_frontend,
 251         .get_frontend = dvb_dummy_fe_get_frontend,
 252
 253         .read_status = dvb_dummy_fe_read_status,
 254         .read_ber = dvb_dummy_fe_read_ber,
 255         .read_signal_strength = dvb_dummy_fe_read_signal_strength,
 256         .read_snr = dvb_dummy_fe_read_snr,
 257         .read_ucblocks = dvb_dummy_fe_read_ucblocks,
 258
 259         .set_voltage = dvb_dummy_fe_set_voltage,
 260         .set_tone = dvb_dummy_fe_set_tone,
 261 };
 262
 263 MODULE_DESCRIPTION("DVB DUMMY Frontend");
 264 MODULE_AUTHOR("Emard");
 265 MODULE_LICENSE("GPL");
 266
 267 EXPORT_SYMBOL(dvb_dummy_fe_ofdm_attach);
 268 EXPORT_SYMBOL(dvb_dummy_fe_qam_attach);
 269 EXPORT_SYMBOL(dvb_dummy_fe_qpsk_attach);