drivers/media/dvb/frontends/cxd2820r_c.c

   1 /*
   2  * Sony CXD2820R demodulator driver
   3  *
   4  * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
   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  *    GNU General Public License for more details.
  15  *
  16  *    You should have received a copy of the GNU General Public License along
  17  *    with this program; if not, write to the Free Software Foundation, Inc.,
  18  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21
  22 #include "cxd2820r_priv.h"
  23
  24 int cxd2820r_set_frontend_c(struct dvb_frontend *fe,
  25         struct dvb_frontend_parameters *params)
  26 {
  27         struct cxd2820r_priv *priv = fe->demodulator_priv;
  28         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  29         int ret, i;
  30         u8 buf[2];
  31         u32 if_freq;
  32         u16 if_ctl;
  33         u64 num;
  34         struct reg_val_mask tab[] = {
  35                 { 0x00080, 0x01, 0xff },
  36                 { 0x00081, 0x05, 0xff },
  37                 { 0x00085, 0x07, 0xff },
  38                 { 0x00088, 0x01, 0xff },
  39
  40                 { 0x00082, 0x20, 0x60 },
  41                 { 0x1016a, 0x48, 0xff },
  42                 { 0x100a5, 0x00, 0x01 },
  43                 { 0x10020, 0x06, 0x07 },
  44                 { 0x10059, 0x50, 0xff },
  45                 { 0x10087, 0x0c, 0x3c },
  46                 { 0x1008b, 0x07, 0xff },
  47                 { 0x1001f, priv->cfg.if_agc_polarity << 7, 0x80 },
  48                 { 0x10070, priv->cfg.ts_mode, 0xff },
  49         };
  50
  51         dbg("%s: RF=%d SR=%d", __func__, c->frequency, c->symbol_rate);
  52
  53         /* update GPIOs */
  54         ret = cxd2820r_gpio(fe);
  55         if (ret)
  56                 goto error;
  57
  58         /* program tuner */
  59         if (fe->ops.tuner_ops.set_params)
  60                 fe->ops.tuner_ops.set_params(fe, params);
  61
  62         if (priv->delivery_system !=  SYS_DVBC_ANNEX_AC) {
  63                 for (i = 0; i < ARRAY_SIZE(tab); i++) {
  64                         ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
  65                                 tab[i].val, tab[i].mask);
  66                         if (ret)
  67                                 goto error;
  68                 }
  69         }
  70
  71         priv->delivery_system = SYS_DVBC_ANNEX_AC;
  72         priv->ber_running = 0; /* tune stops BER counter */
  73
  74         /* program IF frequency */
  75         if (fe->ops.tuner_ops.get_if_frequency) {
  76                 ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
  77                 if (ret)
  78                         goto error;
  79         } else
  80                 if_freq = 0;
  81
  82         dbg("%s: if_freq=%d", __func__, if_freq);
  83
  84         num = if_freq / 1000; /* Hz => kHz */
  85         num *= 0x4000;
  86         if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
  87         buf[0] = (if_ctl >> 8) & 0x3f;
  88         buf[1] = (if_ctl >> 0) & 0xff;
  89
  90         ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
  91         if (ret)
  92                 goto error;
  93
  94         ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
  95         if (ret)
  96                 goto error;
  97
  98         ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
  99         if (ret)
 100                 goto error;
 101
 102         return ret;
 103 error:
 104         dbg("%s: failed:%d", __func__, ret);
 105         return ret;
 106 }
 107
 108 int cxd2820r_get_frontend_c(struct dvb_frontend *fe,
 109         struct dvb_frontend_parameters *p)
 110 {
 111         struct cxd2820r_priv *priv = fe->demodulator_priv;
 112         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 113         int ret;
 114         u8 buf[2];
 115
 116         ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
 117         if (ret)
 118                 goto error;
 119
 120         c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
 121
 122         ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
 123         if (ret)
 124                 goto error;
 125
 126         switch ((buf[0] >> 0) & 0x03) {
 127         case 0:
 128                 c->modulation = QAM_16;
 129                 break;
 130         case 1:
 131                 c->modulation = QAM_32;
 132                 break;
 133         case 2:
 134                 c->modulation = QAM_64;
 135                 break;
 136         case 3:
 137                 c->modulation = QAM_128;
 138                 break;
 139         case 4:
 140                 c->modulation = QAM_256;
 141                 break;
 142         }
 143
 144         switch ((buf[0] >> 7) & 0x01) {
 145         case 0:
 146                 c->inversion = INVERSION_OFF;
 147                 break;
 148         case 1:
 149                 c->inversion = INVERSION_ON;
 150                 break;
 151         }
 152
 153         return ret;
 154 error:
 155         dbg("%s: failed:%d", __func__, ret);
 156         return ret;
 157 }
 158
 159 int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
 160 {
 161         struct cxd2820r_priv *priv = fe->demodulator_priv;
 162         int ret;
 163         u8 buf[3], start_ber = 0;
 164         *ber = 0;
 165
 166         if (priv->ber_running) {
 167                 ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
 168                 if (ret)
 169                         goto error;
 170
 171                 if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
 172                         *ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
 173                         start_ber = 1;
 174                 }
 175         } else {
 176                 priv->ber_running = 1;
 177                 start_ber = 1;
 178         }
 179
 180         if (start_ber) {
 181                 /* (re)start BER */
 182                 ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
 183                 if (ret)
 184                         goto error;
 185         }
 186
 187         return ret;
 188 error:
 189         dbg("%s: failed:%d", __func__, ret);
 190         return ret;
 191 }
 192
 193 int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
 194         u16 *strength)
 195 {
 196         struct cxd2820r_priv *priv = fe->demodulator_priv;
 197         int ret;
 198         u8 buf[2];
 199         u16 tmp;
 200
 201         ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
 202         if (ret)
 203                 goto error;
 204
 205         tmp = (buf[0] & 0x03) << 8 | buf[1];
 206         tmp = (~tmp & 0x03ff);
 207
 208         if (tmp == 512)
 209                 /* ~no signal */
 210                 tmp = 0;
 211         else if (tmp > 350)
 212                 tmp = 350;
 213
 214         /* scale value to 0x0000-0xffff */
 215         *strength = tmp * 0xffff / (350-0);
 216
 217         return ret;
 218 error:
 219         dbg("%s: failed:%d", __func__, ret);
 220         return ret;
 221 }
 222
 223 int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
 224 {
 225         struct cxd2820r_priv *priv = fe->demodulator_priv;
 226         int ret;
 227         u8 tmp;
 228         unsigned int A, B;
 229         /* report SNR in dB * 10 */
 230
 231         ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
 232         if (ret)
 233                 goto error;
 234
 235         if (((tmp >> 0) & 0x03) % 2) {
 236                 A = 875;
 237                 B = 650;
 238         } else {
 239                 A = 950;
 240                 B = 760;
 241         }
 242
 243         ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
 244         if (ret)
 245                 goto error;
 246
 247         #define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
 248         if (tmp)
 249                 *snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
 250                         / 10;
 251         else
 252                 *snr = 0;
 253
 254         return ret;
 255 error:
 256         dbg("%s: failed:%d", __func__, ret);
 257         return ret;
 258 }
 259
 260 int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
 261 {
 262         *ucblocks = 0;
 263         /* no way to read ? */
 264         return 0;
 265 }
 266
 267 int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
 268 {
 269         struct cxd2820r_priv *priv = fe->demodulator_priv;
 270         int ret;
 271         u8 buf[2];
 272         *status = 0;
 273
 274         ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
 275         if (ret)
 276                 goto error;
 277
 278         if (((buf[0] >> 0) & 0x01) == 1) {
 279                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 280                         FE_HAS_VITERBI | FE_HAS_SYNC;
 281
 282                 if (((buf[1] >> 3) & 0x01) == 1) {
 283                         *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 284                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 285                 }
 286         }
 287
 288         dbg("%s: lock=%02x %02x", __func__, buf[0], buf[1]);
 289
 290         return ret;
 291 error:
 292         dbg("%s: failed:%d", __func__, ret);
 293         return ret;
 294 }
 295
 296 int cxd2820r_init_c(struct dvb_frontend *fe)
 297 {
 298         struct cxd2820r_priv *priv = fe->demodulator_priv;
 299         int ret;
 300
 301         ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
 302         if (ret)
 303                 goto error;
 304
 305         return ret;
 306 error:
 307         dbg("%s: failed:%d", __func__, ret);
 308         return ret;
 309 }
 310
 311 int cxd2820r_sleep_c(struct dvb_frontend *fe)
 312 {
 313         struct cxd2820r_priv *priv = fe->demodulator_priv;
 314         int ret, i;
 315         struct reg_val_mask tab[] = {
 316                 { 0x000ff, 0x1f, 0xff },
 317                 { 0x00085, 0x00, 0xff },
 318                 { 0x00088, 0x01, 0xff },
 319                 { 0x00081, 0x00, 0xff },
 320                 { 0x00080, 0x00, 0xff },
 321         };
 322
 323         dbg("%s", __func__);
 324
 325         priv->delivery_system = SYS_UNDEFINED;
 326
 327         for (i = 0; i < ARRAY_SIZE(tab); i++) {
 328                 ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
 329                         tab[i].mask);
 330                 if (ret)
 331                         goto error;
 332         }
 333
 334         return ret;
 335 error:
 336         dbg("%s: failed:%d", __func__, ret);
 337         return ret;
 338 }
 339
 340 int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
 341         struct dvb_frontend_tune_settings *s)
 342 {
 343         s->min_delay_ms = 500;
 344         s->step_size = 0; /* no zigzag */
 345         s->max_drift = 0;
 346
 347         return 0;
 348 }