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