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