drivers/media/dvb-frontends/gp8psk-fe.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Frontend driver for the GENPIX 8pks/qpsk/DCII USB2.0 DVB-S module
   4  *
   5  * Copyright (C) 2006,2007 Alan Nisota (alannisota@gmail.com)
   6  * Copyright (C) 2006,2007 Genpix Electronics (genpix@genpix-electronics.com)
   7  *
   8  * Thanks to GENPIX for the sample code used to implement this module.
   9  *
  10  * This module is based off the vp7045 and vp702x modules
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include "gp8psk-fe.h"
  16 #include <media/dvb_frontend.h>
  17
  18 static int debug;
  19 module_param(debug, int, 0644);
  20 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  21
  22 #define dprintk(fmt, arg...) do {                                       \
  23         if (debug)                                                      \
  24                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  25                        __func__, ##arg);                                \
  26 } while (0)
  27
  28 struct gp8psk_fe_state {
  29         struct dvb_frontend fe;
  30         void *priv;
  31         const struct gp8psk_fe_ops *ops;
  32         bool is_rev1;
  33         u8 lock;
  34         u16 snr;
  35         unsigned long next_status_check;
  36         unsigned long status_check_interval;
  37 };
  38
  39 static int gp8psk_tuned_to_DCII(struct dvb_frontend *fe)
  40 {
  41         struct gp8psk_fe_state *st = fe->demodulator_priv;
  42         u8 status;
  43
  44         st->ops->in(st->priv, GET_8PSK_CONFIG, 0, 0, &status, 1);
  45         return status & bmDCtuned;
  46 }
  47
  48 static int gp8psk_set_tuner_mode(struct dvb_frontend *fe, int mode)
  49 {
  50         struct gp8psk_fe_state *st = fe->demodulator_priv;
  51
  52         return st->ops->out(st->priv, SET_8PSK_CONFIG, mode, 0, NULL, 0);
  53 }
  54
  55 static int gp8psk_fe_update_status(struct gp8psk_fe_state *st)
  56 {
  57         u8 buf[6];
  58         if (time_after(jiffies,st->next_status_check)) {
  59                 st->ops->in(st->priv, GET_SIGNAL_LOCK, 0, 0, &st->lock, 1);
  60                 st->ops->in(st->priv, GET_SIGNAL_STRENGTH, 0, 0, buf, 6);
  61                 st->snr = (buf[1]) << 8 | buf[0];
  62                 st->next_status_check = jiffies + (st->status_check_interval*HZ)/1000;
  63         }
  64         return 0;
  65 }
  66
  67 static int gp8psk_fe_read_status(struct dvb_frontend *fe,
  68                                  enum fe_status *status)
  69 {
  70         struct gp8psk_fe_state *st = fe->demodulator_priv;
  71         gp8psk_fe_update_status(st);
  72
  73         if (st->lock)
  74                 *status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
  75         else
  76                 *status = 0;
  77
  78         if (*status & FE_HAS_LOCK)
  79                 st->status_check_interval = 1000;
  80         else
  81                 st->status_check_interval = 100;
  82         return 0;
  83 }
  84
  85 /* not supported by this Frontend */
  86 static int gp8psk_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  87 {
  88         (void) fe;
  89         *ber = 0;
  90         return 0;
  91 }
  92
  93 /* not supported by this Frontend */
  94 static int gp8psk_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  95 {
  96         (void) fe;
  97         *unc = 0;
  98         return 0;
  99 }
 100
 101 static int gp8psk_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
 102 {
 103         struct gp8psk_fe_state *st = fe->demodulator_priv;
 104         gp8psk_fe_update_status(st);
 105         /* snr is reported in dBu*256 */
 106         *snr = st->snr;
 107         return 0;
 108 }
 109
 110 static int gp8psk_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
 111 {
 112         struct gp8psk_fe_state *st = fe->demodulator_priv;
 113         gp8psk_fe_update_status(st);
 114         /* snr is reported in dBu*256 */
 115         /* snr / 38.4 ~= 100% strength */
 116         /* snr * 17 returns 100% strength as 65535 */
 117         if (st->snr > 0xf00)
 118                 *strength = 0xffff;
 119         else
 120                 *strength = (st->snr << 4) + st->snr; /* snr*17 */
 121         return 0;
 122 }
 123
 124 static int gp8psk_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 125 {
 126         tune->min_delay_ms = 800;
 127         return 0;
 128 }
 129
 130 static int gp8psk_fe_set_frontend(struct dvb_frontend *fe)
 131 {
 132         struct gp8psk_fe_state *st = fe->demodulator_priv;
 133         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 134         u8 cmd[10];
 135         u32 freq = c->frequency * 1000;
 136
 137         dprintk("%s()\n", __func__);
 138
 139         cmd[4] = freq         & 0xff;
 140         cmd[5] = (freq >> 8)  & 0xff;
 141         cmd[6] = (freq >> 16) & 0xff;
 142         cmd[7] = (freq >> 24) & 0xff;
 143
 144         /* backwards compatibility: DVB-S + 8-PSK were used for Turbo-FEC */
 145         if (c->delivery_system == SYS_DVBS && c->modulation == PSK_8)
 146                 c->delivery_system = SYS_TURBO;
 147
 148         switch (c->delivery_system) {
 149         case SYS_DVBS:
 150                 if (c->modulation != QPSK) {
 151                         dprintk("%s: unsupported modulation selected (%d)\n",
 152                                 __func__, c->modulation);
 153                         return -EOPNOTSUPP;
 154                 }
 155                 c->fec_inner = FEC_AUTO;
 156                 break;
 157         case SYS_DVBS2: /* kept for backwards compatibility */
 158                 dprintk("%s: DVB-S2 delivery system selected\n", __func__);
 159                 break;
 160         case SYS_TURBO:
 161                 dprintk("%s: Turbo-FEC delivery system selected\n", __func__);
 162                 break;
 163
 164         default:
 165                 dprintk("%s: unsupported delivery system selected (%d)\n",
 166                         __func__, c->delivery_system);
 167                 return -EOPNOTSUPP;
 168         }
 169
 170         cmd[0] =  c->symbol_rate        & 0xff;
 171         cmd[1] = (c->symbol_rate >>  8) & 0xff;
 172         cmd[2] = (c->symbol_rate >> 16) & 0xff;
 173         cmd[3] = (c->symbol_rate >> 24) & 0xff;
 174         switch (c->modulation) {
 175         case QPSK:
 176                 if (st->is_rev1)
 177                         if (gp8psk_tuned_to_DCII(fe))
 178                                 st->ops->reload(st->priv);
 179                 switch (c->fec_inner) {
 180                 case FEC_1_2:
 181                         cmd[9] = 0; break;
 182                 case FEC_2_3:
 183                         cmd[9] = 1; break;
 184                 case FEC_3_4:
 185                         cmd[9] = 2; break;
 186                 case FEC_5_6:
 187                         cmd[9] = 3; break;
 188                 case FEC_7_8:
 189                         cmd[9] = 4; break;
 190                 case FEC_AUTO:
 191                         cmd[9] = 5; break;
 192                 default:
 193                         cmd[9] = 5; break;
 194                 }
 195                 if (c->delivery_system == SYS_TURBO)
 196                         cmd[8] = ADV_MOD_TURBO_QPSK;
 197                 else
 198                         cmd[8] = ADV_MOD_DVB_QPSK;
 199                 break;
 200         case PSK_8: /* PSK_8 is for compatibility with DN */
 201                 cmd[8] = ADV_MOD_TURBO_8PSK;
 202                 switch (c->fec_inner) {
 203                 case FEC_2_3:
 204                         cmd[9] = 0; break;
 205                 case FEC_3_4:
 206                         cmd[9] = 1; break;
 207                 case FEC_3_5:
 208                         cmd[9] = 2; break;
 209                 case FEC_5_6:
 210                         cmd[9] = 3; break;
 211                 case FEC_8_9:
 212                         cmd[9] = 4; break;
 213                 default:
 214                         cmd[9] = 0; break;
 215                 }
 216                 break;
 217         case QAM_16: /* QAM_16 is for compatibility with DN */
 218                 cmd[8] = ADV_MOD_TURBO_16QAM;
 219                 cmd[9] = 0;
 220                 break;
 221         default: /* Unknown modulation */
 222                 dprintk("%s: unsupported modulation selected (%d)\n",
 223                         __func__, c->modulation);
 224                 return -EOPNOTSUPP;
 225         }
 226
 227         if (st->is_rev1)
 228                 gp8psk_set_tuner_mode(fe, 0);
 229         st->ops->out(st->priv, TUNE_8PSK, 0, 0, cmd, 10);
 230
 231         st->lock = 0;
 232         st->next_status_check = jiffies;
 233         st->status_check_interval = 200;
 234
 235         return 0;
 236 }
 237
 238 static int gp8psk_fe_send_diseqc_msg (struct dvb_frontend* fe,
 239                                     struct dvb_diseqc_master_cmd *m)
 240 {
 241         struct gp8psk_fe_state *st = fe->demodulator_priv;
 242
 243         dprintk("%s\n", __func__);
 244
 245         if (st->ops->out(st->priv, SEND_DISEQC_COMMAND, m->msg[0], 0,
 246                         m->msg, m->msg_len)) {
 247                 return -EINVAL;
 248         }
 249         return 0;
 250 }
 251
 252 static int gp8psk_fe_send_diseqc_burst(struct dvb_frontend *fe,
 253                                        enum fe_sec_mini_cmd burst)
 254 {
 255         struct gp8psk_fe_state *st = fe->demodulator_priv;
 256         u8 cmd;
 257
 258         dprintk("%s\n", __func__);
 259
 260         /* These commands are certainly wrong */
 261         cmd = (burst == SEC_MINI_A) ? 0x00 : 0x01;
 262
 263         if (st->ops->out(st->priv, SEND_DISEQC_COMMAND, cmd, 0,
 264                         &cmd, 0)) {
 265                 return -EINVAL;
 266         }
 267         return 0;
 268 }
 269
 270 static int gp8psk_fe_set_tone(struct dvb_frontend *fe,
 271                               enum fe_sec_tone_mode tone)
 272 {
 273         struct gp8psk_fe_state *st = fe->demodulator_priv;
 274
 275         if (st->ops->out(st->priv, SET_22KHZ_TONE,
 276                          (tone == SEC_TONE_ON), 0, NULL, 0)) {
 277                 return -EINVAL;
 278         }
 279         return 0;
 280 }
 281
 282 static int gp8psk_fe_set_voltage(struct dvb_frontend *fe,
 283                                  enum fe_sec_voltage voltage)
 284 {
 285         struct gp8psk_fe_state *st = fe->demodulator_priv;
 286
 287         if (st->ops->out(st->priv, SET_LNB_VOLTAGE,
 288                          voltage == SEC_VOLTAGE_18, 0, NULL, 0)) {
 289                 return -EINVAL;
 290         }
 291         return 0;
 292 }
 293
 294 static int gp8psk_fe_enable_high_lnb_voltage(struct dvb_frontend* fe, long onoff)
 295 {
 296         struct gp8psk_fe_state *st = fe->demodulator_priv;
 297
 298         return st->ops->out(st->priv, USE_EXTRA_VOLT, onoff, 0, NULL, 0);
 299 }
 300
 301 static int gp8psk_fe_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long sw_cmd)
 302 {
 303         struct gp8psk_fe_state *st = fe->demodulator_priv;
 304         u8 cmd = sw_cmd & 0x7f;
 305
 306         if (st->ops->out(st->priv, SET_DN_SWITCH, cmd, 0, NULL, 0))
 307                 return -EINVAL;
 308
 309         if (st->ops->out(st->priv, SET_LNB_VOLTAGE, !!(sw_cmd & 0x80),
 310                         0, NULL, 0))
 311                 return -EINVAL;
 312
 313         return 0;
 314 }
 315
 316 static void gp8psk_fe_release(struct dvb_frontend* fe)
 317 {
 318         struct gp8psk_fe_state *st = fe->demodulator_priv;
 319
 320         kfree(st);
 321 }
 322
 323 static const struct dvb_frontend_ops gp8psk_fe_ops;
 324
 325 struct dvb_frontend *gp8psk_fe_attach(const struct gp8psk_fe_ops *ops,
 326                                       void *priv, bool is_rev1)
 327 {
 328         struct gp8psk_fe_state *st;
 329
 330         if (!ops || !ops->in || !ops->out || !ops->reload) {
 331                 pr_err("Error! gp8psk-fe ops not defined.\n");
 332                 return NULL;
 333         }
 334
 335         st = kzalloc(sizeof(struct gp8psk_fe_state), GFP_KERNEL);
 336         if (!st)
 337                 return NULL;
 338
 339         memcpy(&st->fe.ops, &gp8psk_fe_ops, sizeof(struct dvb_frontend_ops));
 340         st->fe.demodulator_priv = st;
 341         st->ops = ops;
 342         st->priv = priv;
 343         st->is_rev1 = is_rev1;
 344
 345         pr_info("Frontend %sattached\n", is_rev1 ? "revision 1 " : "");
 346
 347         return &st->fe;
 348 }
 349 EXPORT_SYMBOL_GPL(gp8psk_fe_attach);
 350
 351 static const struct dvb_frontend_ops gp8psk_fe_ops = {
 352         .delsys = { SYS_DVBS },
 353         .info = {
 354                 .name                   = "Genpix DVB-S",
 355                 .frequency_min_hz       =  800 * MHz,
 356                 .frequency_max_hz       = 2250 * MHz,
 357                 .frequency_stepsize_hz  =  100 * kHz,
 358                 .symbol_rate_min        = 1000000,
 359                 .symbol_rate_max        = 45000000,
 360                 .symbol_rate_tolerance  = 500,  /* ppm */
 361                 .caps = FE_CAN_INVERSION_AUTO |
 362                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 363                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 364                         /*
 365                          * FE_CAN_QAM_16 is for compatibility
 366                          * (Myth incorrectly detects Turbo-QPSK as plain QAM-16)
 367                          */
 368                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_TURBO_FEC
 369         },
 370
 371         .release = gp8psk_fe_release,
 372
 373         .init = NULL,
 374         .sleep = NULL,
 375
 376         .set_frontend = gp8psk_fe_set_frontend,
 377
 378         .get_tune_settings = gp8psk_fe_get_tune_settings,
 379
 380         .read_status = gp8psk_fe_read_status,
 381         .read_ber = gp8psk_fe_read_ber,
 382         .read_signal_strength = gp8psk_fe_read_signal_strength,
 383         .read_snr = gp8psk_fe_read_snr,
 384         .read_ucblocks = gp8psk_fe_read_unc_blocks,
 385
 386         .diseqc_send_master_cmd = gp8psk_fe_send_diseqc_msg,
 387         .diseqc_send_burst = gp8psk_fe_send_diseqc_burst,
 388         .set_tone = gp8psk_fe_set_tone,
 389         .set_voltage = gp8psk_fe_set_voltage,
 390         .dishnetwork_send_legacy_command = gp8psk_fe_send_legacy_dish_cmd,
 391         .enable_high_lnb_voltage = gp8psk_fe_enable_high_lnb_voltage
 392 };
 393
 394 MODULE_AUTHOR("Alan Nisota <alannisota@gamil.com>");
 395 MODULE_DESCRIPTION("Frontend Driver for Genpix DVB-S");
 396 MODULE_VERSION("1.1");
 397 MODULE_LICENSE("GPL");