kernel/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                 { 0x10071, !priv->cfg.ts_clock_inv << 4, 0x10 },
  49         };
  50
  51         dev_dbg(&priv->i2c->dev, "%s: frequency=%d symbol_rate=%d\n", __func__,
  52                         c->frequency, c->symbol_rate);
  53
  54         /* program tuner */
  55         if (fe->ops.tuner_ops.set_params)
  56                 fe->ops.tuner_ops.set_params(fe);
  57
  58         if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
  59                 for (i = 0; i < ARRAY_SIZE(tab); i++) {
  60                         ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
  61                                 tab[i].val, tab[i].mask);
  62                         if (ret)
  63                                 goto error;
  64                 }
  65         }
  66
  67         priv->delivery_system = SYS_DVBC_ANNEX_A;
  68         priv->ber_running = false; /* tune stops BER counter */
  69
  70         /* program IF frequency */
  71         if (fe->ops.tuner_ops.get_if_frequency) {
  72                 ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
  73                 if (ret)
  74                         goto error;
  75         } else
  76                 if_freq = 0;
  77
  78         dev_dbg(&priv->i2c->dev, "%s: if_freq=%d\n", __func__, if_freq);
  79
  80         num = if_freq / 1000; /* Hz => kHz */
  81         num *= 0x4000;
  82         if_ctl = 0x4000 - DIV_ROUND_CLOSEST_ULL(num, 41000);
  83         buf[0] = (if_ctl >> 8) & 0x3f;
  84         buf[1] = (if_ctl >> 0) & 0xff;
  85
  86         ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
  87         if (ret)
  88                 goto error;
  89
  90         ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
  91         if (ret)
  92                 goto error;
  93
  94         ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
  95         if (ret)
  96                 goto error;
  97
  98         return ret;
  99 error:
 100         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 101         return ret;
 102 }
 103
 104 int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
 105 {
 106         struct cxd2820r_priv *priv = fe->demodulator_priv;
 107         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 108         int ret;
 109         u8 buf[2];
 110
 111         ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
 112         if (ret)
 113                 goto error;
 114
 115         c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
 116
 117         ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
 118         if (ret)
 119                 goto error;
 120
 121         switch ((buf[0] >> 0) & 0x07) {
 122         case 0:
 123                 c->modulation = QAM_16;
 124                 break;
 125         case 1:
 126                 c->modulation = QAM_32;
 127                 break;
 128         case 2:
 129                 c->modulation = QAM_64;
 130                 break;
 131         case 3:
 132                 c->modulation = QAM_128;
 133                 break;
 134         case 4:
 135                 c->modulation = QAM_256;
 136                 break;
 137         }
 138
 139         switch ((buf[0] >> 7) & 0x01) {
 140         case 0:
 141                 c->inversion = INVERSION_OFF;
 142                 break;
 143         case 1:
 144                 c->inversion = INVERSION_ON;
 145                 break;
 146         }
 147
 148         return ret;
 149 error:
 150         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 151         return ret;
 152 }
 153
 154 int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
 155 {
 156         struct cxd2820r_priv *priv = fe->demodulator_priv;
 157         int ret;
 158         u8 buf[3], start_ber = 0;
 159         *ber = 0;
 160
 161         if (priv->ber_running) {
 162                 ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
 163                 if (ret)
 164                         goto error;
 165
 166                 if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
 167                         *ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
 168                         start_ber = 1;
 169                 }
 170         } else {
 171                 priv->ber_running = true;
 172                 start_ber = 1;
 173         }
 174
 175         if (start_ber) {
 176                 /* (re)start BER */
 177                 ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
 178                 if (ret)
 179                         goto error;
 180         }
 181
 182         return ret;
 183 error:
 184         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 185         return ret;
 186 }
 187
 188 int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
 189         u16 *strength)
 190 {
 191         struct cxd2820r_priv *priv = fe->demodulator_priv;
 192         int ret;
 193         u8 buf[2];
 194         u16 tmp;
 195
 196         ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
 197         if (ret)
 198                 goto error;
 199
 200         tmp = (buf[0] & 0x03) << 8 | buf[1];
 201         tmp = (~tmp & 0x03ff);
 202
 203         if (tmp == 512)
 204                 /* ~no signal */
 205                 tmp = 0;
 206         else if (tmp > 350)
 207                 tmp = 350;
 208
 209         /* scale value to 0x0000-0xffff */
 210         *strength = tmp * 0xffff / (350-0);
 211
 212         return ret;
 213 error:
 214         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 215         return ret;
 216 }
 217
 218 int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
 219 {
 220         struct cxd2820r_priv *priv = fe->demodulator_priv;
 221         int ret;
 222         u8 tmp;
 223         unsigned int A, B;
 224         /* report SNR in dB * 10 */
 225
 226         ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
 227         if (ret)
 228                 goto error;
 229
 230         if (((tmp >> 0) & 0x03) % 2) {
 231                 A = 875;
 232                 B = 650;
 233         } else {
 234                 A = 950;
 235                 B = 760;
 236         }
 237
 238         ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
 239         if (ret)
 240                 goto error;
 241
 242         #define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
 243         if (tmp)
 244                 *snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
 245                         / 10;
 246         else
 247                 *snr = 0;
 248
 249         return ret;
 250 error:
 251         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 252         return ret;
 253 }
 254
 255 int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
 256 {
 257         *ucblocks = 0;
 258         /* no way to read ? */
 259         return 0;
 260 }
 261
 262 int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
 263 {
 264         struct cxd2820r_priv *priv = fe->demodulator_priv;
 265         int ret;
 266         u8 buf[2];
 267         *status = 0;
 268
 269         ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
 270         if (ret)
 271                 goto error;
 272
 273         if (((buf[0] >> 0) & 0x01) == 1) {
 274                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 275                         FE_HAS_VITERBI | FE_HAS_SYNC;
 276
 277                 if (((buf[1] >> 3) & 0x01) == 1) {
 278                         *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 279                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 280                 }
 281         }
 282
 283         dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
 284                         buf[1]);
 285
 286         return ret;
 287 error:
 288         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 289         return ret;
 290 }
 291
 292 int cxd2820r_init_c(struct dvb_frontend *fe)
 293 {
 294         struct cxd2820r_priv *priv = fe->demodulator_priv;
 295         int ret;
 296
 297         ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
 298         if (ret)
 299                 goto error;
 300
 301         return ret;
 302 error:
 303         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 304         return ret;
 305 }
 306
 307 int cxd2820r_sleep_c(struct dvb_frontend *fe)
 308 {
 309         struct cxd2820r_priv *priv = fe->demodulator_priv;
 310         int ret, i;
 311         struct reg_val_mask tab[] = {
 312                 { 0x000ff, 0x1f, 0xff },
 313                 { 0x00085, 0x00, 0xff },
 314                 { 0x00088, 0x01, 0xff },
 315                 { 0x00081, 0x00, 0xff },
 316                 { 0x00080, 0x00, 0xff },
 317         };
 318
 319         dev_dbg(&priv->i2c->dev, "%s\n", __func__);
 320
 321         priv->delivery_system = SYS_UNDEFINED;
 322
 323         for (i = 0; i < ARRAY_SIZE(tab); i++) {
 324                 ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
 325                         tab[i].mask);
 326                 if (ret)
 327                         goto error;
 328         }
 329
 330         return ret;
 331 error:
 332         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 333         return ret;
 334 }
 335
 336 int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
 337         struct dvb_frontend_tune_settings *s)
 338 {
 339         s->min_delay_ms = 500;
 340         s->step_size = 0; /* no zigzag */
 341         s->max_drift = 0;
 342
 343         return 0;
 344 }