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         dev_dbg(&priv->i2c->dev, "%s: frequency=%d symbol_rate=%d\n", __func__,
  51                         c->frequency, c->symbol_rate);
  52
  53         /* program tuner */
  54         if (fe->ops.tuner_ops.set_params)
  55                 fe->ops.tuner_ops.set_params(fe);
  56
  57         if (priv->delivery_system !=  SYS_DVBC_ANNEX_A) {
  58                 for (i = 0; i < ARRAY_SIZE(tab); i++) {
  59                         ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
  60                                 tab[i].val, tab[i].mask);
  61                         if (ret)
  62                                 goto error;
  63                 }
  64         }
  65
  66         priv->delivery_system = SYS_DVBC_ANNEX_A;
  67         priv->ber_running = 0; /* tune stops BER counter */
  68
  69         /* program IF frequency */
  70         if (fe->ops.tuner_ops.get_if_frequency) {
  71                 ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
  72                 if (ret)
  73                         goto error;
  74         } else
  75                 if_freq = 0;
  76
  77         dev_dbg(&priv->i2c->dev, "%s: if_freq=%d\n", __func__, if_freq);
  78
  79         num = if_freq / 1000; /* Hz => kHz */
  80         num *= 0x4000;
  81         if_ctl = 0x4000 - cxd2820r_div_u64_round_closest(num, 41000);
  82         buf[0] = (if_ctl >> 8) & 0x3f;
  83         buf[1] = (if_ctl >> 0) & 0xff;
  84
  85         ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
  86         if (ret)
  87                 goto error;
  88
  89         ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
  90         if (ret)
  91                 goto error;
  92
  93         ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
  94         if (ret)
  95                 goto error;
  96
  97         return ret;
  98 error:
  99         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 100         return ret;
 101 }
 102
 103 int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
 104 {
 105         struct cxd2820r_priv *priv = fe->demodulator_priv;
 106         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 107         int ret;
 108         u8 buf[2];
 109
 110         ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
 111         if (ret)
 112                 goto error;
 113
 114         c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
 115
 116         ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
 117         if (ret)
 118                 goto error;
 119
 120         switch ((buf[0] >> 0) & 0x07) {
 121         case 0:
 122                 c->modulation = QAM_16;
 123                 break;
 124         case 1:
 125                 c->modulation = QAM_32;
 126                 break;
 127         case 2:
 128                 c->modulation = QAM_64;
 129                 break;
 130         case 3:
 131                 c->modulation = QAM_128;
 132                 break;
 133         case 4:
 134                 c->modulation = QAM_256;
 135                 break;
 136         }
 137
 138         switch ((buf[0] >> 7) & 0x01) {
 139         case 0:
 140                 c->inversion = INVERSION_OFF;
 141                 break;
 142         case 1:
 143                 c->inversion = INVERSION_ON;
 144                 break;
 145         }
 146
 147         return ret;
 148 error:
 149         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 150         return ret;
 151 }
 152
 153 int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
 154 {
 155         struct cxd2820r_priv *priv = fe->demodulator_priv;
 156         int ret;
 157         u8 buf[3], start_ber = 0;
 158         *ber = 0;
 159
 160         if (priv->ber_running) {
 161                 ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
 162                 if (ret)
 163                         goto error;
 164
 165                 if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
 166                         *ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
 167                         start_ber = 1;
 168                 }
 169         } else {
 170                 priv->ber_running = 1;
 171                 start_ber = 1;
 172         }
 173
 174         if (start_ber) {
 175                 /* (re)start BER */
 176                 ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
 177                 if (ret)
 178                         goto error;
 179         }
 180
 181         return ret;
 182 error:
 183         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 184         return ret;
 185 }
 186
 187 int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
 188         u16 *strength)
 189 {
 190         struct cxd2820r_priv *priv = fe->demodulator_priv;
 191         int ret;
 192         u8 buf[2];
 193         u16 tmp;
 194
 195         ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
 196         if (ret)
 197                 goto error;
 198
 199         tmp = (buf[0] & 0x03) << 8 | buf[1];
 200         tmp = (~tmp & 0x03ff);
 201
 202         if (tmp == 512)
 203                 /* ~no signal */
 204                 tmp = 0;
 205         else if (tmp > 350)
 206                 tmp = 350;
 207
 208         /* scale value to 0x0000-0xffff */
 209         *strength = tmp * 0xffff / (350-0);
 210
 211         return ret;
 212 error:
 213         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 214         return ret;
 215 }
 216
 217 int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
 218 {
 219         struct cxd2820r_priv *priv = fe->demodulator_priv;
 220         int ret;
 221         u8 tmp;
 222         unsigned int A, B;
 223         /* report SNR in dB * 10 */
 224
 225         ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
 226         if (ret)
 227                 goto error;
 228
 229         if (((tmp >> 0) & 0x03) % 2) {
 230                 A = 875;
 231                 B = 650;
 232         } else {
 233                 A = 950;
 234                 B = 760;
 235         }
 236
 237         ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
 238         if (ret)
 239                 goto error;
 240
 241         #define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
 242         if (tmp)
 243                 *snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
 244                         / 10;
 245         else
 246                 *snr = 0;
 247
 248         return ret;
 249 error:
 250         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 251         return ret;
 252 }
 253
 254 int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
 255 {
 256         *ucblocks = 0;
 257         /* no way to read ? */
 258         return 0;
 259 }
 260
 261 int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
 262 {
 263         struct cxd2820r_priv *priv = fe->demodulator_priv;
 264         int ret;
 265         u8 buf[2];
 266         *status = 0;
 267
 268         ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
 269         if (ret)
 270                 goto error;
 271
 272         if (((buf[0] >> 0) & 0x01) == 1) {
 273                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 274                         FE_HAS_VITERBI | FE_HAS_SYNC;
 275
 276                 if (((buf[1] >> 3) & 0x01) == 1) {
 277                         *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 278                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 279                 }
 280         }
 281
 282         dev_dbg(&priv->i2c->dev, "%s: lock=%02x %02x\n", __func__, buf[0],
 283                         buf[1]);
 284
 285         return ret;
 286 error:
 287         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 288         return ret;
 289 }
 290
 291 int cxd2820r_init_c(struct dvb_frontend *fe)
 292 {
 293         struct cxd2820r_priv *priv = fe->demodulator_priv;
 294         int ret;
 295
 296         ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
 297         if (ret)
 298                 goto error;
 299
 300         return ret;
 301 error:
 302         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 303         return ret;
 304 }
 305
 306 int cxd2820r_sleep_c(struct dvb_frontend *fe)
 307 {
 308         struct cxd2820r_priv *priv = fe->demodulator_priv;
 309         int ret, i;
 310         struct reg_val_mask tab[] = {
 311                 { 0x000ff, 0x1f, 0xff },
 312                 { 0x00085, 0x00, 0xff },
 313                 { 0x00088, 0x01, 0xff },
 314                 { 0x00081, 0x00, 0xff },
 315                 { 0x00080, 0x00, 0xff },
 316         };
 317
 318         dev_dbg(&priv->i2c->dev, "%s\n", __func__);
 319
 320         priv->delivery_system = SYS_UNDEFINED;
 321
 322         for (i = 0; i < ARRAY_SIZE(tab); i++) {
 323                 ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
 324                         tab[i].mask);
 325                 if (ret)
 326                         goto error;
 327         }
 328
 329         return ret;
 330 error:
 331         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 332         return ret;
 333 }
 334
 335 int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
 336         struct dvb_frontend_tune_settings *s)
 337 {
 338         s->min_delay_ms = 500;
 339         s->step_size = 0; /* no zigzag */
 340         s->max_drift = 0;
 341
 342         return 0;
 343 }