drivers/media/dvb-frontends/mb86a20s.c

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This source file includes following definitions.
mb86a20s_i2c_writereg
mb86a20s_i2c_writeregdata
mb86a20s_i2c_readreg
mb86a20s_read_status
mb86a20s_read_signal_strength
mb86a20s_get_modulation
mb86a20s_get_fec
mb86a20s_get_interleaving
mb86a20s_get_segment_count
mb86a20s_reset_frontend_cache
mb86a20s_layer_bitrate
mb86a20s_get_frontend
mb86a20s_reset_counters
mb86a20s_get_pre_ber
mb86a20s_get_post_ber
mb86a20s_get_blk_error
interpolate_value
mb86a20s_get_main_CNR
mb86a20s_get_blk_error_layer_CNR
mb86a20s_stats_not_ready
mb86a20s_get_stats
mb86a20s_initfe
mb86a20s_set_frontend
mb86a20s_read_status_and_stats
mb86a20s_read_signal_strength_from_cache
mb86a20s_tune
mb86a20s_release
mb86a20s_get_frontend_algo
mb86a20s_attach
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *   Fujitu mb86a20s ISDB-T/ISDB-Tsb Module driver
   4  *
   5  *   Copyright (C) 2010-2013 Mauro Carvalho Chehab
   6  *   Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
   7  */
   8 
   9 #include <linux/kernel.h>
  10 #include <asm/div64.h>
  11 
  12 #include <media/dvb_frontend.h>
  13 #include "mb86a20s.h"
  14 
  15 #define NUM_LAYERS 3
  16 
  17 enum mb86a20s_bandwidth {
  18         MB86A20S_13SEG = 0,
  19         MB86A20S_13SEG_PARTIAL = 1,
  20         MB86A20S_1SEG = 2,
  21         MB86A20S_3SEG = 3,
  22 };
  23 
  24 static u8 mb86a20s_subchannel[] = {
  25         0xb0, 0xc0, 0xd0, 0xe0,
  26         0xf0, 0x00, 0x10, 0x20,
  27 };
  28 
  29 struct mb86a20s_state {
  30         struct i2c_adapter *i2c;
  31         const struct mb86a20s_config *config;
  32         u32 last_frequency;
  33 
  34         struct dvb_frontend frontend;
  35 
  36         u32 if_freq;
  37         enum mb86a20s_bandwidth bw;
  38         bool inversion;
  39         u32 subchannel;
  40 
  41         u32 estimated_rate[NUM_LAYERS];
  42         unsigned long get_strength_time;
  43 
  44         bool need_init;
  45 };
  46 
  47 struct regdata {
  48         u8 reg;
  49         u8 data;
  50 };
  51 
  52 #define BER_SAMPLING_RATE       1       /* Seconds */
  53 
  54 /*
  55  * Initialization sequence: Use whatevere default values that PV SBTVD
  56  * does on its initialisation, obtained via USB snoop
  57  */
  58 static struct regdata mb86a20s_init1[] = {
  59         { 0x70, 0x0f },
  60         { 0x70, 0xff },
  61         { 0x08, 0x01 },
  62         { 0x50, 0xd1 }, { 0x51, 0x20 },
  63 };
  64 
  65 static struct regdata mb86a20s_init2[] = {
  66         { 0x50, 0xd1 }, { 0x51, 0x22 },
  67         { 0x39, 0x01 },
  68         { 0x71, 0x00 },
  69         { 0x3b, 0x21 },
  70         { 0x3c, 0x3a },
  71         { 0x01, 0x0d },
  72         { 0x04, 0x08 }, { 0x05, 0x05 },
  73         { 0x04, 0x0e }, { 0x05, 0x00 },
  74         { 0x04, 0x0f }, { 0x05, 0x14 },
  75         { 0x04, 0x0b }, { 0x05, 0x8c },
  76         { 0x04, 0x00 }, { 0x05, 0x00 },
  77         { 0x04, 0x01 }, { 0x05, 0x07 },
  78         { 0x04, 0x02 }, { 0x05, 0x0f },
  79         { 0x04, 0x03 }, { 0x05, 0xa0 },
  80         { 0x04, 0x09 }, { 0x05, 0x00 },
  81         { 0x04, 0x0a }, { 0x05, 0xff },
  82         { 0x04, 0x27 }, { 0x05, 0x64 },
  83         { 0x04, 0x28 }, { 0x05, 0x00 },
  84         { 0x04, 0x1e }, { 0x05, 0xff },
  85         { 0x04, 0x29 }, { 0x05, 0x0a },
  86         { 0x04, 0x32 }, { 0x05, 0x0a },
  87         { 0x04, 0x14 }, { 0x05, 0x02 },
  88         { 0x04, 0x04 }, { 0x05, 0x00 },
  89         { 0x04, 0x05 }, { 0x05, 0x22 },
  90         { 0x04, 0x06 }, { 0x05, 0x0e },
  91         { 0x04, 0x07 }, { 0x05, 0xd8 },
  92         { 0x04, 0x12 }, { 0x05, 0x00 },
  93         { 0x04, 0x13 }, { 0x05, 0xff },
  94 
  95         /*
  96          * On this demod, when the bit count reaches the count below,
  97          * it collects the bit error count. The bit counters are initialized
  98          * to 65535 here. This warrants that all of them will be quickly
  99          * calculated when device gets locked. As TMCC is parsed, the values
 100          * will be adjusted later in the driver's code.
 101          */
 102         { 0x52, 0x01 },                         /* Turn on BER before Viterbi */
 103         { 0x50, 0xa7 }, { 0x51, 0x00 },
 104         { 0x50, 0xa8 }, { 0x51, 0xff },
 105         { 0x50, 0xa9 }, { 0x51, 0xff },
 106         { 0x50, 0xaa }, { 0x51, 0x00 },
 107         { 0x50, 0xab }, { 0x51, 0xff },
 108         { 0x50, 0xac }, { 0x51, 0xff },
 109         { 0x50, 0xad }, { 0x51, 0x00 },
 110         { 0x50, 0xae }, { 0x51, 0xff },
 111         { 0x50, 0xaf }, { 0x51, 0xff },
 112 
 113         /*
 114          * On this demod, post BER counts blocks. When the count reaches the
 115          * value below, it collects the block error count. The block counters
 116          * are initialized to 127 here. This warrants that all of them will be
 117          * quickly calculated when device gets locked. As TMCC is parsed, the
 118          * values will be adjusted later in the driver's code.
 119          */
 120         { 0x5e, 0x07 },                         /* Turn on BER after Viterbi */
 121         { 0x50, 0xdc }, { 0x51, 0x00 },
 122         { 0x50, 0xdd }, { 0x51, 0x7f },
 123         { 0x50, 0xde }, { 0x51, 0x00 },
 124         { 0x50, 0xdf }, { 0x51, 0x7f },
 125         { 0x50, 0xe0 }, { 0x51, 0x00 },
 126         { 0x50, 0xe1 }, { 0x51, 0x7f },
 127 
 128         /*
 129          * On this demod, when the block count reaches the count below,
 130          * it collects the block error count. The block counters are initialized
 131          * to 127 here. This warrants that all of them will be quickly
 132          * calculated when device gets locked. As TMCC is parsed, the values
 133          * will be adjusted later in the driver's code.
 134          */
 135         { 0x50, 0xb0 }, { 0x51, 0x07 },         /* Enable PER */
 136         { 0x50, 0xb2 }, { 0x51, 0x00 },
 137         { 0x50, 0xb3 }, { 0x51, 0x7f },
 138         { 0x50, 0xb4 }, { 0x51, 0x00 },
 139         { 0x50, 0xb5 }, { 0x51, 0x7f },
 140         { 0x50, 0xb6 }, { 0x51, 0x00 },
 141         { 0x50, 0xb7 }, { 0x51, 0x7f },
 142 
 143         { 0x50, 0x50 }, { 0x51, 0x02 },         /* MER manual mode */
 144         { 0x50, 0x51 }, { 0x51, 0x04 },         /* MER symbol 4 */
 145         { 0x45, 0x04 },                         /* CN symbol 4 */
 146         { 0x48, 0x04 },                         /* CN manual mode */
 147         { 0x50, 0xd5 }, { 0x51, 0x01 },
 148         { 0x50, 0xd6 }, { 0x51, 0x1f },
 149         { 0x50, 0xd2 }, { 0x51, 0x03 },
 150         { 0x50, 0xd7 }, { 0x51, 0x3f },
 151         { 0x1c, 0x01 },
 152         { 0x28, 0x06 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x03 },
 153         { 0x28, 0x07 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x0d },
 154         { 0x28, 0x08 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x02 },
 155         { 0x28, 0x09 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x01 },
 156         { 0x28, 0x0a }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x21 },
 157         { 0x28, 0x0b }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x29 },
 158         { 0x28, 0x0c }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x16 },
 159         { 0x28, 0x0d }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x31 },
 160         { 0x28, 0x0e }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x0e },
 161         { 0x28, 0x0f }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x4e },
 162         { 0x28, 0x10 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x46 },
 163         { 0x28, 0x11 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x0f },
 164         { 0x28, 0x12 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x56 },
 165         { 0x28, 0x13 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x35 },
 166         { 0x28, 0x14 }, { 0x29, 0x00 }, { 0x2a, 0x01 }, { 0x2b, 0xbe },
 167         { 0x28, 0x15 }, { 0x29, 0x00 }, { 0x2a, 0x01 }, { 0x2b, 0x84 },
 168         { 0x28, 0x16 }, { 0x29, 0x00 }, { 0x2a, 0x03 }, { 0x2b, 0xee },
 169         { 0x28, 0x17 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x98 },
 170         { 0x28, 0x18 }, { 0x29, 0x00 }, { 0x2a, 0x00 }, { 0x2b, 0x9f },
 171         { 0x28, 0x19 }, { 0x29, 0x00 }, { 0x2a, 0x07 }, { 0x2b, 0xb2 },
 172         { 0x28, 0x1a }, { 0x29, 0x00 }, { 0x2a, 0x06 }, { 0x2b, 0xc2 },
 173         { 0x28, 0x1b }, { 0x29, 0x00 }, { 0x2a, 0x07 }, { 0x2b, 0x4a },
 174         { 0x28, 0x1c }, { 0x29, 0x00 }, { 0x2a, 0x01 }, { 0x2b, 0xbc },
 175         { 0x28, 0x1d }, { 0x29, 0x00 }, { 0x2a, 0x04 }, { 0x2b, 0xba },
 176         { 0x28, 0x1e }, { 0x29, 0x00 }, { 0x2a, 0x06 }, { 0x2b, 0x14 },
 177         { 0x50, 0x1e }, { 0x51, 0x5d },
 178         { 0x50, 0x22 }, { 0x51, 0x00 },
 179         { 0x50, 0x23 }, { 0x51, 0xc8 },
 180         { 0x50, 0x24 }, { 0x51, 0x00 },
 181         { 0x50, 0x25 }, { 0x51, 0xf0 },
 182         { 0x50, 0x26 }, { 0x51, 0x00 },
 183         { 0x50, 0x27 }, { 0x51, 0xc3 },
 184         { 0x50, 0x39 }, { 0x51, 0x02 },
 185         { 0x50, 0xd5 }, { 0x51, 0x01 },
 186         { 0xd0, 0x00 },
 187 };
 188 
 189 static struct regdata mb86a20s_reset_reception[] = {
 190         { 0x70, 0xf0 },
 191         { 0x70, 0xff },
 192         { 0x08, 0x01 },
 193         { 0x08, 0x00 },
 194 };
 195 
 196 static struct regdata mb86a20s_per_ber_reset[] = {
 197         { 0x53, 0x00 }, /* pre BER Counter reset */
 198         { 0x53, 0x07 },
 199 
 200         { 0x5f, 0x00 }, /* post BER Counter reset */
 201         { 0x5f, 0x07 },
 202 
 203         { 0x50, 0xb1 }, /* PER Counter reset */
 204         { 0x51, 0x07 },
 205         { 0x51, 0x00 },
 206 };
 207 
 208 /*
 209  * I2C read/write functions and macros
 210  */
 211 
 212 static int mb86a20s_i2c_writereg(struct mb86a20s_state *state,
 213                              u8 i2c_addr, u8 reg, u8 data)
 214 {
 215         u8 buf[] = { reg, data };
 216         struct i2c_msg msg = {
 217                 .addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
 218         };
 219         int rc;
 220 
 221         rc = i2c_transfer(state->i2c, &msg, 1);
 222         if (rc != 1) {
 223                 dev_err(&state->i2c->dev,
 224                         "%s: writereg error (rc == %i, reg == 0x%02x, data == 0x%02x)\n",
 225                         __func__, rc, reg, data);
 226                 return rc;
 227         }
 228 
 229         return 0;
 230 }
 231 
 232 static int mb86a20s_i2c_writeregdata(struct mb86a20s_state *state,
 233                                      u8 i2c_addr, struct regdata *rd, int size)
 234 {
 235         int i, rc;
 236 
 237         for (i = 0; i < size; i++) {
 238                 rc = mb86a20s_i2c_writereg(state, i2c_addr, rd[i].reg,
 239                                            rd[i].data);
 240                 if (rc < 0)
 241                         return rc;
 242         }
 243         return 0;
 244 }
 245 
 246 static int mb86a20s_i2c_readreg(struct mb86a20s_state *state,
 247                                 u8 i2c_addr, u8 reg)
 248 {
 249         u8 val;
 250         int rc;
 251         struct i2c_msg msg[] = {
 252                 { .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
 253                 { .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
 254         };
 255 
 256         rc = i2c_transfer(state->i2c, msg, 2);
 257 
 258         if (rc != 2) {
 259                 dev_err(&state->i2c->dev, "%s: reg=0x%x (error=%d)\n",
 260                         __func__, reg, rc);
 261                 return (rc < 0) ? rc : -EIO;
 262         }
 263 
 264         return val;
 265 }
 266 
 267 #define mb86a20s_readreg(state, reg) \
 268         mb86a20s_i2c_readreg(state, state->config->demod_address, reg)
 269 #define mb86a20s_writereg(state, reg, val) \
 270         mb86a20s_i2c_writereg(state, state->config->demod_address, reg, val)
 271 #define mb86a20s_writeregdata(state, regdata) \
 272         mb86a20s_i2c_writeregdata(state, state->config->demod_address, \
 273         regdata, ARRAY_SIZE(regdata))
 274 
 275 /*
 276  * Ancillary internal routines (likely compiled inlined)
 277  *
 278  * The functions below assume that gateway lock has already obtained
 279  */
 280 
 281 static int mb86a20s_read_status(struct dvb_frontend *fe, enum fe_status *status)
 282 {
 283         struct mb86a20s_state *state = fe->demodulator_priv;
 284         int val;
 285 
 286         *status = 0;
 287 
 288         val = mb86a20s_readreg(state, 0x0a);
 289         if (val < 0)
 290                 return val;
 291 
 292         val &= 0xf;
 293         if (val >= 2)
 294                 *status |= FE_HAS_SIGNAL;
 295 
 296         if (val >= 4)
 297                 *status |= FE_HAS_CARRIER;
 298 
 299         if (val >= 5)
 300                 *status |= FE_HAS_VITERBI;
 301 
 302         if (val >= 7)
 303                 *status |= FE_HAS_SYNC;
 304 
 305         /*
 306          * Actually, on state S8, it starts receiving TS, but the TS
 307          * output is only on normal state after the transition to S9.
 308          */
 309         if (val >= 9)
 310                 *status |= FE_HAS_LOCK;
 311 
 312         dev_dbg(&state->i2c->dev, "%s: Status = 0x%02x (state = %d)\n",
 313                  __func__, *status, val);
 314 
 315         return val;
 316 }
 317 
 318 static int mb86a20s_read_signal_strength(struct dvb_frontend *fe)
 319 {
 320         struct mb86a20s_state *state = fe->demodulator_priv;
 321         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 322         int rc;
 323         unsigned rf_max, rf_min, rf;
 324 
 325         if (state->get_strength_time &&
 326            (!time_after(jiffies, state->get_strength_time)))
 327                 return c->strength.stat[0].uvalue;
 328 
 329         /* Reset its value if an error happen */
 330         c->strength.stat[0].uvalue = 0;
 331 
 332         /* Does a binary search to get RF strength */
 333         rf_max = 0xfff;
 334         rf_min = 0;
 335         do {
 336                 rf = (rf_max + rf_min) / 2;
 337                 rc = mb86a20s_writereg(state, 0x04, 0x1f);
 338                 if (rc < 0)
 339                         return rc;
 340                 rc = mb86a20s_writereg(state, 0x05, rf >> 8);
 341                 if (rc < 0)
 342                         return rc;
 343                 rc = mb86a20s_writereg(state, 0x04, 0x20);
 344                 if (rc < 0)
 345                         return rc;
 346                 rc = mb86a20s_writereg(state, 0x05, rf);
 347                 if (rc < 0)
 348                         return rc;
 349 
 350                 rc = mb86a20s_readreg(state, 0x02);
 351                 if (rc < 0)
 352                         return rc;
 353                 if (rc & 0x08)
 354                         rf_min = (rf_max + rf_min) / 2;
 355                 else
 356                         rf_max = (rf_max + rf_min) / 2;
 357                 if (rf_max - rf_min < 4) {
 358                         rf = (rf_max + rf_min) / 2;
 359 
 360                         /* Rescale it from 2^12 (4096) to 2^16 */
 361                         rf = rf << (16 - 12);
 362                         if (rf)
 363                                 rf |= (1 << 12) - 1;
 364 
 365                         dev_dbg(&state->i2c->dev,
 366                                 "%s: signal strength = %d (%d < RF=%d < %d)\n",
 367                                 __func__, rf, rf_min, rf >> 4, rf_max);
 368                         c->strength.stat[0].uvalue = rf;
 369                         state->get_strength_time = jiffies +
 370                                                    msecs_to_jiffies(1000);
 371                         return 0;
 372                 }
 373         } while (1);
 374 }
 375 
 376 static int mb86a20s_get_modulation(struct mb86a20s_state *state,
 377                                    unsigned layer)
 378 {
 379         int rc;
 380         static unsigned char reg[] = {
 381                 [0] = 0x86,     /* Layer A */
 382                 [1] = 0x8a,     /* Layer B */
 383                 [2] = 0x8e,     /* Layer C */
 384         };
 385 
 386         if (layer >= ARRAY_SIZE(reg))
 387                 return -EINVAL;
 388         rc = mb86a20s_writereg(state, 0x6d, reg[layer]);
 389         if (rc < 0)
 390                 return rc;
 391         rc = mb86a20s_readreg(state, 0x6e);
 392         if (rc < 0)
 393                 return rc;
 394         switch ((rc >> 4) & 0x07) {
 395         case 0:
 396                 return DQPSK;
 397         case 1:
 398                 return QPSK;
 399         case 2:
 400                 return QAM_16;
 401         case 3:
 402                 return QAM_64;
 403         default:
 404                 return QAM_AUTO;
 405         }
 406 }
 407 
 408 static int mb86a20s_get_fec(struct mb86a20s_state *state,
 409                             unsigned layer)
 410 {
 411         int rc;
 412 
 413         static unsigned char reg[] = {
 414                 [0] = 0x87,     /* Layer A */
 415                 [1] = 0x8b,     /* Layer B */
 416                 [2] = 0x8f,     /* Layer C */
 417         };
 418 
 419         if (layer >= ARRAY_SIZE(reg))
 420                 return -EINVAL;
 421         rc = mb86a20s_writereg(state, 0x6d, reg[layer]);
 422         if (rc < 0)
 423                 return rc;
 424         rc = mb86a20s_readreg(state, 0x6e);
 425         if (rc < 0)
 426                 return rc;
 427         switch ((rc >> 4) & 0x07) {
 428         case 0:
 429                 return FEC_1_2;
 430         case 1:
 431                 return FEC_2_3;
 432         case 2:
 433                 return FEC_3_4;
 434         case 3:
 435                 return FEC_5_6;
 436         case 4:
 437                 return FEC_7_8;
 438         default:
 439                 return FEC_AUTO;
 440         }
 441 }
 442 
 443 static int mb86a20s_get_interleaving(struct mb86a20s_state *state,
 444                                      unsigned layer)
 445 {
 446         int rc;
 447         int interleaving[] = {
 448                 0, 1, 2, 4, 8
 449         };
 450 
 451         static unsigned char reg[] = {
 452                 [0] = 0x88,     /* Layer A */
 453                 [1] = 0x8c,     /* Layer B */
 454                 [2] = 0x90,     /* Layer C */
 455         };
 456 
 457         if (layer >= ARRAY_SIZE(reg))
 458                 return -EINVAL;
 459         rc = mb86a20s_writereg(state, 0x6d, reg[layer]);
 460         if (rc < 0)
 461                 return rc;
 462         rc = mb86a20s_readreg(state, 0x6e);
 463         if (rc < 0)
 464                 return rc;
 465 
 466         return interleaving[(rc >> 4) & 0x07];
 467 }
 468 
 469 static int mb86a20s_get_segment_count(struct mb86a20s_state *state,
 470                                       unsigned layer)
 471 {
 472         int rc, count;
 473         static unsigned char reg[] = {
 474                 [0] = 0x89,     /* Layer A */
 475                 [1] = 0x8d,     /* Layer B */
 476                 [2] = 0x91,     /* Layer C */
 477         };
 478 
 479         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 480 
 481         if (layer >= ARRAY_SIZE(reg))
 482                 return -EINVAL;
 483 
 484         rc = mb86a20s_writereg(state, 0x6d, reg[layer]);
 485         if (rc < 0)
 486                 return rc;
 487         rc = mb86a20s_readreg(state, 0x6e);
 488         if (rc < 0)
 489                 return rc;
 490         count = (rc >> 4) & 0x0f;
 491 
 492         dev_dbg(&state->i2c->dev, "%s: segments: %d.\n", __func__, count);
 493 
 494         return count;
 495 }
 496 
 497 static void mb86a20s_reset_frontend_cache(struct dvb_frontend *fe)
 498 {
 499         struct mb86a20s_state *state = fe->demodulator_priv;
 500         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 501 
 502         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 503 
 504         /* Fixed parameters */
 505         c->delivery_system = SYS_ISDBT;
 506         c->bandwidth_hz = 6000000;
 507 
 508         /* Initialize values that will be later autodetected */
 509         c->isdbt_layer_enabled = 0;
 510         c->transmission_mode = TRANSMISSION_MODE_AUTO;
 511         c->guard_interval = GUARD_INTERVAL_AUTO;
 512         c->isdbt_sb_mode = 0;
 513         c->isdbt_sb_segment_count = 0;
 514 }
 515 
 516 /*
 517  * Estimates the bit rate using the per-segment bit rate given by
 518  * ABNT/NBR 15601 spec (table 4).
 519  */
 520 static u32 isdbt_rate[3][5][4] = {
 521         {       /* DQPSK/QPSK */
 522                 {  280850,  312060,  330420,  340430 }, /* 1/2 */
 523                 {  374470,  416080,  440560,  453910 }, /* 2/3 */
 524                 {  421280,  468090,  495630,  510650 }, /* 3/4 */
 525                 {  468090,  520100,  550700,  567390 }, /* 5/6 */
 526                 {  491500,  546110,  578230,  595760 }, /* 7/8 */
 527         }, {    /* QAM16 */
 528                 {  561710,  624130,  660840,  680870 }, /* 1/2 */
 529                 {  748950,  832170,  881120,  907820 }, /* 2/3 */
 530                 {  842570,  936190,  991260, 1021300 }, /* 3/4 */
 531                 {  936190, 1040210, 1101400, 1134780 }, /* 5/6 */
 532                 {  983000, 1092220, 1156470, 1191520 }, /* 7/8 */
 533         }, {    /* QAM64 */
 534                 {  842570,  936190,  991260, 1021300 }, /* 1/2 */
 535                 { 1123430, 1248260, 1321680, 1361740 }, /* 2/3 */
 536                 { 1263860, 1404290, 1486900, 1531950 }, /* 3/4 */
 537                 { 1404290, 1560320, 1652110, 1702170 }, /* 5/6 */
 538                 { 1474500, 1638340, 1734710, 1787280 }, /* 7/8 */
 539         }
 540 };
 541 
 542 static void mb86a20s_layer_bitrate(struct dvb_frontend *fe, u32 layer,
 543                                    u32 modulation, u32 forward_error_correction,
 544                                    u32 guard_interval,
 545                                    u32 segment)
 546 {
 547         struct mb86a20s_state *state = fe->demodulator_priv;
 548         u32 rate;
 549         int mod, fec, guard;
 550 
 551         /*
 552          * If modulation/fec/guard is not detected, the default is
 553          * to consider the lowest bit rate, to avoid taking too long time
 554          * to get BER.
 555          */
 556         switch (modulation) {
 557         case DQPSK:
 558         case QPSK:
 559         default:
 560                 mod = 0;
 561                 break;
 562         case QAM_16:
 563                 mod = 1;
 564                 break;
 565         case QAM_64:
 566                 mod = 2;
 567                 break;
 568         }
 569 
 570         switch (forward_error_correction) {
 571         default:
 572         case FEC_1_2:
 573         case FEC_AUTO:
 574                 fec = 0;
 575                 break;
 576         case FEC_2_3:
 577                 fec = 1;
 578                 break;
 579         case FEC_3_4:
 580                 fec = 2;
 581                 break;
 582         case FEC_5_6:
 583                 fec = 3;
 584                 break;
 585         case FEC_7_8:
 586                 fec = 4;
 587                 break;
 588         }
 589 
 590         switch (guard_interval) {
 591         default:
 592         case GUARD_INTERVAL_1_4:
 593                 guard = 0;
 594                 break;
 595         case GUARD_INTERVAL_1_8:
 596                 guard = 1;
 597                 break;
 598         case GUARD_INTERVAL_1_16:
 599                 guard = 2;
 600                 break;
 601         case GUARD_INTERVAL_1_32:
 602                 guard = 3;
 603                 break;
 604         }
 605 
 606         /* Samples BER at BER_SAMPLING_RATE seconds */
 607         rate = isdbt_rate[mod][fec][guard] * segment * BER_SAMPLING_RATE;
 608 
 609         /* Avoids sampling too quickly or to overflow the register */
 610         if (rate < 256)
 611                 rate = 256;
 612         else if (rate > (1 << 24) - 1)
 613                 rate = (1 << 24) - 1;
 614 
 615         dev_dbg(&state->i2c->dev,
 616                 "%s: layer %c bitrate: %d kbps; counter = %d (0x%06x)\n",
 617                 __func__, 'A' + layer,
 618                 segment * isdbt_rate[mod][fec][guard]/1000,
 619                 rate, rate);
 620 
 621         state->estimated_rate[layer] = rate;
 622 }
 623 
 624 static int mb86a20s_get_frontend(struct dvb_frontend *fe)
 625 {
 626         struct mb86a20s_state *state = fe->demodulator_priv;
 627         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 628         int layer, rc;
 629 
 630         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 631 
 632         /* Reset frontend cache to default values */
 633         mb86a20s_reset_frontend_cache(fe);
 634 
 635         /* Check for partial reception */
 636         rc = mb86a20s_writereg(state, 0x6d, 0x85);
 637         if (rc < 0)
 638                 return rc;
 639         rc = mb86a20s_readreg(state, 0x6e);
 640         if (rc < 0)
 641                 return rc;
 642         c->isdbt_partial_reception = (rc & 0x10) ? 1 : 0;
 643 
 644         /* Get per-layer data */
 645 
 646         for (layer = 0; layer < NUM_LAYERS; layer++) {
 647                 dev_dbg(&state->i2c->dev, "%s: getting data for layer %c.\n",
 648                         __func__, 'A' + layer);
 649 
 650                 rc = mb86a20s_get_segment_count(state, layer);
 651                 if (rc < 0)
 652                         goto noperlayer_error;
 653                 if (rc >= 0 && rc < 14) {
 654                         c->layer[layer].segment_count = rc;
 655                 } else {
 656                         c->layer[layer].segment_count = 0;
 657                         state->estimated_rate[layer] = 0;
 658                         continue;
 659                 }
 660                 c->isdbt_layer_enabled |= 1 << layer;
 661                 rc = mb86a20s_get_modulation(state, layer);
 662                 if (rc < 0)
 663                         goto noperlayer_error;
 664                 dev_dbg(&state->i2c->dev, "%s: modulation %d.\n",
 665                         __func__, rc);
 666                 c->layer[layer].modulation = rc;
 667                 rc = mb86a20s_get_fec(state, layer);
 668                 if (rc < 0)
 669                         goto noperlayer_error;
 670                 dev_dbg(&state->i2c->dev, "%s: FEC %d.\n",
 671                         __func__, rc);
 672                 c->layer[layer].fec = rc;
 673                 rc = mb86a20s_get_interleaving(state, layer);
 674                 if (rc < 0)
 675                         goto noperlayer_error;
 676                 dev_dbg(&state->i2c->dev, "%s: interleaving %d.\n",
 677                         __func__, rc);
 678                 c->layer[layer].interleaving = rc;
 679                 mb86a20s_layer_bitrate(fe, layer, c->layer[layer].modulation,
 680                                        c->layer[layer].fec,
 681                                        c->guard_interval,
 682                                        c->layer[layer].segment_count);
 683         }
 684 
 685         rc = mb86a20s_writereg(state, 0x6d, 0x84);
 686         if (rc < 0)
 687                 return rc;
 688         if ((rc & 0x60) == 0x20) {
 689                 c->isdbt_sb_mode = 1;
 690                 /* At least, one segment should exist */
 691                 if (!c->isdbt_sb_segment_count)
 692                         c->isdbt_sb_segment_count = 1;
 693         }
 694 
 695         /* Get transmission mode and guard interval */
 696         rc = mb86a20s_readreg(state, 0x07);
 697         if (rc < 0)
 698                 return rc;
 699         c->transmission_mode = TRANSMISSION_MODE_AUTO;
 700         if ((rc & 0x60) == 0x20) {
 701                 /* Only modes 2 and 3 are supported */
 702                 switch ((rc >> 2) & 0x03) {
 703                 case 1:
 704                         c->transmission_mode = TRANSMISSION_MODE_4K;
 705                         break;
 706                 case 2:
 707                         c->transmission_mode = TRANSMISSION_MODE_8K;
 708                         break;
 709                 }
 710         }
 711         c->guard_interval = GUARD_INTERVAL_AUTO;
 712         if (!(rc & 0x10)) {
 713                 /* Guard interval 1/32 is not supported */
 714                 switch (rc & 0x3) {
 715                 case 0:
 716                         c->guard_interval = GUARD_INTERVAL_1_4;
 717                         break;
 718                 case 1:
 719                         c->guard_interval = GUARD_INTERVAL_1_8;
 720                         break;
 721                 case 2:
 722                         c->guard_interval = GUARD_INTERVAL_1_16;
 723                         break;
 724                 }
 725         }
 726         return 0;
 727 
 728 noperlayer_error:
 729 
 730         /* per-layer info is incomplete; discard all per-layer */
 731         c->isdbt_layer_enabled = 0;
 732 
 733         return rc;
 734 }
 735 
 736 static int mb86a20s_reset_counters(struct dvb_frontend *fe)
 737 {
 738         struct mb86a20s_state *state = fe->demodulator_priv;
 739         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 740         int rc, val;
 741 
 742         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 743 
 744         /* Reset the counters, if the channel changed */
 745         if (state->last_frequency != c->frequency) {
 746                 memset(&c->cnr, 0, sizeof(c->cnr));
 747                 memset(&c->pre_bit_error, 0, sizeof(c->pre_bit_error));
 748                 memset(&c->pre_bit_count, 0, sizeof(c->pre_bit_count));
 749                 memset(&c->post_bit_error, 0, sizeof(c->post_bit_error));
 750                 memset(&c->post_bit_count, 0, sizeof(c->post_bit_count));
 751                 memset(&c->block_error, 0, sizeof(c->block_error));
 752                 memset(&c->block_count, 0, sizeof(c->block_count));
 753 
 754                 state->last_frequency = c->frequency;
 755         }
 756 
 757         /* Clear status for most stats */
 758 
 759         /* BER/PER counter reset */
 760         rc = mb86a20s_writeregdata(state, mb86a20s_per_ber_reset);
 761         if (rc < 0)
 762                 goto err;
 763 
 764         /* CNR counter reset */
 765         rc = mb86a20s_readreg(state, 0x45);
 766         if (rc < 0)
 767                 goto err;
 768         val = rc;
 769         rc = mb86a20s_writereg(state, 0x45, val | 0x10);
 770         if (rc < 0)
 771                 goto err;
 772         rc = mb86a20s_writereg(state, 0x45, val & 0x6f);
 773         if (rc < 0)
 774                 goto err;
 775 
 776         /* MER counter reset */
 777         rc = mb86a20s_writereg(state, 0x50, 0x50);
 778         if (rc < 0)
 779                 goto err;
 780         rc = mb86a20s_readreg(state, 0x51);
 781         if (rc < 0)
 782                 goto err;
 783         val = rc;
 784         rc = mb86a20s_writereg(state, 0x51, val | 0x01);
 785         if (rc < 0)
 786                 goto err;
 787         rc = mb86a20s_writereg(state, 0x51, val & 0x06);
 788         if (rc < 0)
 789                 goto err;
 790 
 791         goto ok;
 792 err:
 793         dev_err(&state->i2c->dev,
 794                 "%s: Can't reset FE statistics (error %d).\n",
 795                 __func__, rc);
 796 ok:
 797         return rc;
 798 }
 799 
 800 static int mb86a20s_get_pre_ber(struct dvb_frontend *fe,
 801                                 unsigned layer,
 802                                 u32 *error, u32 *count)
 803 {
 804         struct mb86a20s_state *state = fe->demodulator_priv;
 805         int rc, val;
 806 
 807         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 808 
 809         if (layer >= NUM_LAYERS)
 810                 return -EINVAL;
 811 
 812         /* Check if the BER measures are already available */
 813         rc = mb86a20s_readreg(state, 0x54);
 814         if (rc < 0)
 815                 return rc;
 816 
 817         /* Check if data is available for that layer */
 818         if (!(rc & (1 << layer))) {
 819                 dev_dbg(&state->i2c->dev,
 820                         "%s: preBER for layer %c is not available yet.\n",
 821                         __func__, 'A' + layer);
 822                 return -EBUSY;
 823         }
 824 
 825         /* Read Bit Error Count */
 826         rc = mb86a20s_readreg(state, 0x55 + layer * 3);
 827         if (rc < 0)
 828                 return rc;
 829         *error = rc << 16;
 830         rc = mb86a20s_readreg(state, 0x56 + layer * 3);
 831         if (rc < 0)
 832                 return rc;
 833         *error |= rc << 8;
 834         rc = mb86a20s_readreg(state, 0x57 + layer * 3);
 835         if (rc < 0)
 836                 return rc;
 837         *error |= rc;
 838 
 839         dev_dbg(&state->i2c->dev,
 840                 "%s: bit error before Viterbi for layer %c: %d.\n",
 841                 __func__, 'A' + layer, *error);
 842 
 843         /* Read Bit Count */
 844         rc = mb86a20s_writereg(state, 0x50, 0xa7 + layer * 3);
 845         if (rc < 0)
 846                 return rc;
 847         rc = mb86a20s_readreg(state, 0x51);
 848         if (rc < 0)
 849                 return rc;
 850         *count = rc << 16;
 851         rc = mb86a20s_writereg(state, 0x50, 0xa8 + layer * 3);
 852         if (rc < 0)
 853                 return rc;
 854         rc = mb86a20s_readreg(state, 0x51);
 855         if (rc < 0)
 856                 return rc;
 857         *count |= rc << 8;
 858         rc = mb86a20s_writereg(state, 0x50, 0xa9 + layer * 3);
 859         if (rc < 0)
 860                 return rc;
 861         rc = mb86a20s_readreg(state, 0x51);
 862         if (rc < 0)
 863                 return rc;
 864         *count |= rc;
 865 
 866         dev_dbg(&state->i2c->dev,
 867                 "%s: bit count before Viterbi for layer %c: %d.\n",
 868                 __func__, 'A' + layer, *count);
 869 
 870 
 871         /*
 872          * As we get TMCC data from the frontend, we can better estimate the
 873          * BER bit counters, in order to do the BER measure during a longer
 874          * time. Use those data, if available, to update the bit count
 875          * measure.
 876          */
 877 
 878         if (state->estimated_rate[layer]
 879             && state->estimated_rate[layer] != *count) {
 880                 dev_dbg(&state->i2c->dev,
 881                         "%s: updating layer %c preBER counter to %d.\n",
 882                         __func__, 'A' + layer, state->estimated_rate[layer]);
 883 
 884                 /* Turn off BER before Viterbi */
 885                 rc = mb86a20s_writereg(state, 0x52, 0x00);
 886 
 887                 /* Update counter for this layer */
 888                 rc = mb86a20s_writereg(state, 0x50, 0xa7 + layer * 3);
 889                 if (rc < 0)
 890                         return rc;
 891                 rc = mb86a20s_writereg(state, 0x51,
 892                                        state->estimated_rate[layer] >> 16);
 893                 if (rc < 0)
 894                         return rc;
 895                 rc = mb86a20s_writereg(state, 0x50, 0xa8 + layer * 3);
 896                 if (rc < 0)
 897                         return rc;
 898                 rc = mb86a20s_writereg(state, 0x51,
 899                                        state->estimated_rate[layer] >> 8);
 900                 if (rc < 0)
 901                         return rc;
 902                 rc = mb86a20s_writereg(state, 0x50, 0xa9 + layer * 3);
 903                 if (rc < 0)
 904                         return rc;
 905                 rc = mb86a20s_writereg(state, 0x51,
 906                                        state->estimated_rate[layer]);
 907                 if (rc < 0)
 908                         return rc;
 909 
 910                 /* Turn on BER before Viterbi */
 911                 rc = mb86a20s_writereg(state, 0x52, 0x01);
 912 
 913                 /* Reset all preBER counters */
 914                 rc = mb86a20s_writereg(state, 0x53, 0x00);
 915                 if (rc < 0)
 916                         return rc;
 917                 rc = mb86a20s_writereg(state, 0x53, 0x07);
 918         } else {
 919                 /* Reset counter to collect new data */
 920                 rc = mb86a20s_readreg(state, 0x53);
 921                 if (rc < 0)
 922                         return rc;
 923                 val = rc;
 924                 rc = mb86a20s_writereg(state, 0x53, val & ~(1 << layer));
 925                 if (rc < 0)
 926                         return rc;
 927                 rc = mb86a20s_writereg(state, 0x53, val | (1 << layer));
 928         }
 929 
 930         return rc;
 931 }
 932 
 933 static int mb86a20s_get_post_ber(struct dvb_frontend *fe,
 934                                  unsigned layer,
 935                                   u32 *error, u32 *count)
 936 {
 937         struct mb86a20s_state *state = fe->demodulator_priv;
 938         u32 counter, collect_rate;
 939         int rc, val;
 940 
 941         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
 942 
 943         if (layer >= NUM_LAYERS)
 944                 return -EINVAL;
 945 
 946         /* Check if the BER measures are already available */
 947         rc = mb86a20s_readreg(state, 0x60);
 948         if (rc < 0)
 949                 return rc;
 950 
 951         /* Check if data is available for that layer */
 952         if (!(rc & (1 << layer))) {
 953                 dev_dbg(&state->i2c->dev,
 954                         "%s: post BER for layer %c is not available yet.\n",
 955                         __func__, 'A' + layer);
 956                 return -EBUSY;
 957         }
 958 
 959         /* Read Bit Error Count */
 960         rc = mb86a20s_readreg(state, 0x64 + layer * 3);
 961         if (rc < 0)
 962                 return rc;
 963         *error = rc << 16;
 964         rc = mb86a20s_readreg(state, 0x65 + layer * 3);
 965         if (rc < 0)
 966                 return rc;
 967         *error |= rc << 8;
 968         rc = mb86a20s_readreg(state, 0x66 + layer * 3);
 969         if (rc < 0)
 970                 return rc;
 971         *error |= rc;
 972 
 973         dev_dbg(&state->i2c->dev,
 974                 "%s: post bit error for layer %c: %d.\n",
 975                 __func__, 'A' + layer, *error);
 976 
 977         /* Read Bit Count */
 978         rc = mb86a20s_writereg(state, 0x50, 0xdc + layer * 2);
 979         if (rc < 0)
 980                 return rc;
 981         rc = mb86a20s_readreg(state, 0x51);
 982         if (rc < 0)
 983                 return rc;
 984         counter = rc << 8;
 985         rc = mb86a20s_writereg(state, 0x50, 0xdd + layer * 2);
 986         if (rc < 0)
 987                 return rc;
 988         rc = mb86a20s_readreg(state, 0x51);
 989         if (rc < 0)
 990                 return rc;
 991         counter |= rc;
 992         *count = counter * 204 * 8;
 993 
 994         dev_dbg(&state->i2c->dev,
 995                 "%s: post bit count for layer %c: %d.\n",
 996                 __func__, 'A' + layer, *count);
 997 
 998         /*
 999          * As we get TMCC data from the frontend, we can better estimate the
1000          * BER bit counters, in order to do the BER measure during a longer
1001          * time. Use those data, if available, to update the bit count
1002          * measure.
1003          */
1004 
1005         if (!state->estimated_rate[layer])
1006                 goto reset_measurement;
1007 
1008         collect_rate = state->estimated_rate[layer] / 204 / 8;
1009         if (collect_rate < 32)
1010                 collect_rate = 32;
1011         if (collect_rate > 65535)
1012                 collect_rate = 65535;
1013         if (collect_rate != counter) {
1014                 dev_dbg(&state->i2c->dev,
1015                         "%s: updating postBER counter on layer %c to %d.\n",
1016                         __func__, 'A' + layer, collect_rate);
1017 
1018                 /* Turn off BER after Viterbi */
1019                 rc = mb86a20s_writereg(state, 0x5e, 0x00);
1020 
1021                 /* Update counter for this layer */
1022                 rc = mb86a20s_writereg(state, 0x50, 0xdc + layer * 2);
1023                 if (rc < 0)
1024                         return rc;
1025                 rc = mb86a20s_writereg(state, 0x51, collect_rate >> 8);
1026                 if (rc < 0)
1027                         return rc;
1028                 rc = mb86a20s_writereg(state, 0x50, 0xdd + layer * 2);
1029                 if (rc < 0)
1030                         return rc;
1031                 rc = mb86a20s_writereg(state, 0x51, collect_rate & 0xff);
1032                 if (rc < 0)
1033                         return rc;
1034 
1035                 /* Turn on BER after Viterbi */
1036                 rc = mb86a20s_writereg(state, 0x5e, 0x07);
1037 
1038                 /* Reset all preBER counters */
1039                 rc = mb86a20s_writereg(state, 0x5f, 0x00);
1040                 if (rc < 0)
1041                         return rc;
1042                 rc = mb86a20s_writereg(state, 0x5f, 0x07);
1043 
1044                 return rc;
1045         }
1046 
1047 reset_measurement:
1048         /* Reset counter to collect new data */
1049         rc = mb86a20s_readreg(state, 0x5f);
1050         if (rc < 0)
1051                 return rc;
1052         val = rc;
1053         rc = mb86a20s_writereg(state, 0x5f, val & ~(1 << layer));
1054         if (rc < 0)
1055                 return rc;
1056         rc = mb86a20s_writereg(state, 0x5f, val | (1 << layer));
1057 
1058         return rc;
1059 }
1060 
1061 static int mb86a20s_get_blk_error(struct dvb_frontend *fe,
1062                             unsigned layer,
1063                             u32 *error, u32 *count)
1064 {
1065         struct mb86a20s_state *state = fe->demodulator_priv;
1066         int rc, val;
1067         u32 collect_rate;
1068         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1069 
1070         if (layer >= NUM_LAYERS)
1071                 return -EINVAL;
1072 
1073         /* Check if the PER measures are already available */
1074         rc = mb86a20s_writereg(state, 0x50, 0xb8);
1075         if (rc < 0)
1076                 return rc;
1077         rc = mb86a20s_readreg(state, 0x51);
1078         if (rc < 0)
1079                 return rc;
1080 
1081         /* Check if data is available for that layer */
1082 
1083         if (!(rc & (1 << layer))) {
1084                 dev_dbg(&state->i2c->dev,
1085                         "%s: block counts for layer %c aren't available yet.\n",
1086                         __func__, 'A' + layer);
1087                 return -EBUSY;
1088         }
1089 
1090         /* Read Packet error Count */
1091         rc = mb86a20s_writereg(state, 0x50, 0xb9 + layer * 2);
1092         if (rc < 0)
1093                 return rc;
1094         rc = mb86a20s_readreg(state, 0x51);
1095         if (rc < 0)
1096                 return rc;
1097         *error = rc << 8;
1098         rc = mb86a20s_writereg(state, 0x50, 0xba + layer * 2);
1099         if (rc < 0)
1100                 return rc;
1101         rc = mb86a20s_readreg(state, 0x51);
1102         if (rc < 0)
1103                 return rc;
1104         *error |= rc;
1105         dev_dbg(&state->i2c->dev, "%s: block error for layer %c: %d.\n",
1106                 __func__, 'A' + layer, *error);
1107 
1108         /* Read Bit Count */
1109         rc = mb86a20s_writereg(state, 0x50, 0xb2 + layer * 2);
1110         if (rc < 0)
1111                 return rc;
1112         rc = mb86a20s_readreg(state, 0x51);
1113         if (rc < 0)
1114                 return rc;
1115         *count = rc << 8;
1116         rc = mb86a20s_writereg(state, 0x50, 0xb3 + layer * 2);
1117         if (rc < 0)
1118                 return rc;
1119         rc = mb86a20s_readreg(state, 0x51);
1120         if (rc < 0)
1121                 return rc;
1122         *count |= rc;
1123 
1124         dev_dbg(&state->i2c->dev,
1125                 "%s: block count for layer %c: %d.\n",
1126                 __func__, 'A' + layer, *count);
1127 
1128         /*
1129          * As we get TMCC data from the frontend, we can better estimate the
1130          * BER bit counters, in order to do the BER measure during a longer
1131          * time. Use those data, if available, to update the bit count
1132          * measure.
1133          */
1134 
1135         if (!state->estimated_rate[layer])
1136                 goto reset_measurement;
1137 
1138         collect_rate = state->estimated_rate[layer] / 204 / 8;
1139         if (collect_rate < 32)
1140                 collect_rate = 32;
1141         if (collect_rate > 65535)
1142                 collect_rate = 65535;
1143 
1144         if (collect_rate != *count) {
1145                 dev_dbg(&state->i2c->dev,
1146                         "%s: updating PER counter on layer %c to %d.\n",
1147                         __func__, 'A' + layer, collect_rate);
1148 
1149                 /* Stop PER measurement */
1150                 rc = mb86a20s_writereg(state, 0x50, 0xb0);
1151                 if (rc < 0)
1152                         return rc;
1153                 rc = mb86a20s_writereg(state, 0x51, 0x00);
1154                 if (rc < 0)
1155                         return rc;
1156 
1157                 /* Update this layer's counter */
1158                 rc = mb86a20s_writereg(state, 0x50, 0xb2 + layer * 2);
1159                 if (rc < 0)
1160                         return rc;
1161                 rc = mb86a20s_writereg(state, 0x51, collect_rate >> 8);
1162                 if (rc < 0)
1163                         return rc;
1164                 rc = mb86a20s_writereg(state, 0x50, 0xb3 + layer * 2);
1165                 if (rc < 0)
1166                         return rc;
1167                 rc = mb86a20s_writereg(state, 0x51, collect_rate & 0xff);
1168                 if (rc < 0)
1169                         return rc;
1170 
1171                 /* start PER measurement */
1172                 rc = mb86a20s_writereg(state, 0x50, 0xb0);
1173                 if (rc < 0)
1174                         return rc;
1175                 rc = mb86a20s_writereg(state, 0x51, 0x07);
1176                 if (rc < 0)
1177                         return rc;
1178 
1179                 /* Reset all counters to collect new data */
1180                 rc = mb86a20s_writereg(state, 0x50, 0xb1);
1181                 if (rc < 0)
1182                         return rc;
1183                 rc = mb86a20s_writereg(state, 0x51, 0x07);
1184                 if (rc < 0)
1185                         return rc;
1186                 rc = mb86a20s_writereg(state, 0x51, 0x00);
1187 
1188                 return rc;
1189         }
1190 
1191 reset_measurement:
1192         /* Reset counter to collect new data */
1193         rc = mb86a20s_writereg(state, 0x50, 0xb1);
1194         if (rc < 0)
1195                 return rc;
1196         rc = mb86a20s_readreg(state, 0x51);
1197         if (rc < 0)
1198                 return rc;
1199         val = rc;
1200         rc = mb86a20s_writereg(state, 0x51, val | (1 << layer));
1201         if (rc < 0)
1202                 return rc;
1203         rc = mb86a20s_writereg(state, 0x51, val & ~(1 << layer));
1204 
1205         return rc;
1206 }
1207 
1208 struct linear_segments {
1209         unsigned x, y;
1210 };
1211 
1212 /*
1213  * All tables below return a dB/1000 measurement
1214  */
1215 
1216 static const struct linear_segments cnr_to_db_table[] = {
1217         { 19648,     0},
1218         { 18187,  1000},
1219         { 16534,  2000},
1220         { 14823,  3000},
1221         { 13161,  4000},
1222         { 11622,  5000},
1223         { 10279,  6000},
1224         {  9089,  7000},
1225         {  8042,  8000},
1226         {  7137,  9000},
1227         {  6342, 10000},
1228         {  5641, 11000},
1229         {  5030, 12000},
1230         {  4474, 13000},
1231         {  3988, 14000},
1232         {  3556, 15000},
1233         {  3180, 16000},
1234         {  2841, 17000},
1235         {  2541, 18000},
1236         {  2276, 19000},
1237         {  2038, 20000},
1238         {  1800, 21000},
1239         {  1625, 22000},
1240         {  1462, 23000},
1241         {  1324, 24000},
1242         {  1175, 25000},
1243         {  1063, 26000},
1244         {   980, 27000},
1245         {   907, 28000},
1246         {   840, 29000},
1247         {   788, 30000},
1248 };
1249 
1250 static const struct linear_segments cnr_64qam_table[] = {
1251         { 3922688,     0},
1252         { 3920384,  1000},
1253         { 3902720,  2000},
1254         { 3894784,  3000},
1255         { 3882496,  4000},
1256         { 3872768,  5000},
1257         { 3858944,  6000},
1258         { 3851520,  7000},
1259         { 3838976,  8000},
1260         { 3829248,  9000},
1261         { 3818240, 10000},
1262         { 3806976, 11000},
1263         { 3791872, 12000},
1264         { 3767040, 13000},
1265         { 3720960, 14000},
1266         { 3637504, 15000},
1267         { 3498496, 16000},
1268         { 3296000, 17000},
1269         { 3031040, 18000},
1270         { 2715392, 19000},
1271         { 2362624, 20000},
1272         { 1963264, 21000},
1273         { 1649664, 22000},
1274         { 1366784, 23000},
1275         { 1120768, 24000},
1276         {  890880, 25000},
1277         {  723456, 26000},
1278         {  612096, 27000},
1279         {  518912, 28000},
1280         {  448256, 29000},
1281         {  388864, 30000},
1282 };
1283 
1284 static const struct linear_segments cnr_16qam_table[] = {
1285         { 5314816,     0},
1286         { 5219072,  1000},
1287         { 5118720,  2000},
1288         { 4998912,  3000},
1289         { 4875520,  4000},
1290         { 4736000,  5000},
1291         { 4604160,  6000},
1292         { 4458752,  7000},
1293         { 4300288,  8000},
1294         { 4092928,  9000},
1295         { 3836160, 10000},
1296         { 3521024, 11000},
1297         { 3155968, 12000},
1298         { 2756864, 13000},
1299         { 2347008, 14000},
1300         { 1955072, 15000},
1301         { 1593600, 16000},
1302         { 1297920, 17000},
1303         { 1043968, 18000},
1304         {  839680, 19000},
1305         {  672256, 20000},
1306         {  523008, 21000},
1307         {  424704, 22000},
1308         {  345088, 23000},
1309         {  280064, 24000},
1310         {  221440, 25000},
1311         {  179712, 26000},
1312         {  151040, 27000},
1313         {  128512, 28000},
1314         {  110080, 29000},
1315         {   95744, 30000},
1316 };
1317 
1318 static const struct linear_segments cnr_qpsk_table[] = {
1319         { 2834176,     0},
1320         { 2683648,  1000},
1321         { 2536960,  2000},
1322         { 2391808,  3000},
1323         { 2133248,  4000},
1324         { 1906176,  5000},
1325         { 1666560,  6000},
1326         { 1422080,  7000},
1327         { 1189632,  8000},
1328         {  976384,  9000},
1329         {  790272, 10000},
1330         {  633344, 11000},
1331         {  505600, 12000},
1332         {  402944, 13000},
1333         {  320768, 14000},
1334         {  255488, 15000},
1335         {  204032, 16000},
1336         {  163072, 17000},
1337         {  130304, 18000},
1338         {  105216, 19000},
1339         {   83456, 20000},
1340         {   65024, 21000},
1341         {   52480, 22000},
1342         {   42752, 23000},
1343         {   34560, 24000},
1344         {   27136, 25000},
1345         {   22016, 26000},
1346         {   18432, 27000},
1347         {   15616, 28000},
1348         {   13312, 29000},
1349         {   11520, 30000},
1350 };
1351 
1352 static u32 interpolate_value(u32 value, const struct linear_segments *segments,
1353                              unsigned len)
1354 {
1355         u64 tmp64;
1356         u32 dx, dy;
1357         int i, ret;
1358 
1359         if (value >= segments[0].x)
1360                 return segments[0].y;
1361         if (value < segments[len-1].x)
1362                 return segments[len-1].y;
1363 
1364         for (i = 1; i < len - 1; i++) {
1365                 /* If value is identical, no need to interpolate */
1366                 if (value == segments[i].x)
1367                         return segments[i].y;
1368                 if (value > segments[i].x)
1369                         break;
1370         }
1371 
1372         /* Linear interpolation between the two (x,y) points */
1373         dy = segments[i].y - segments[i - 1].y;
1374         dx = segments[i - 1].x - segments[i].x;
1375         tmp64 = value - segments[i].x;
1376         tmp64 *= dy;
1377         do_div(tmp64, dx);
1378         ret = segments[i].y - tmp64;
1379 
1380         return ret;
1381 }
1382 
1383 static int mb86a20s_get_main_CNR(struct dvb_frontend *fe)
1384 {
1385         struct mb86a20s_state *state = fe->demodulator_priv;
1386         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1387         u32 cnr_linear, cnr;
1388         int rc, val;
1389 
1390         /* Check if CNR is available */
1391         rc = mb86a20s_readreg(state, 0x45);
1392         if (rc < 0)
1393                 return rc;
1394 
1395         if (!(rc & 0x40)) {
1396                 dev_dbg(&state->i2c->dev, "%s: CNR is not available yet.\n",
1397                          __func__);
1398                 return -EBUSY;
1399         }
1400         val = rc;
1401 
1402         rc = mb86a20s_readreg(state, 0x46);
1403         if (rc < 0)
1404                 return rc;
1405         cnr_linear = rc << 8;
1406 
1407         rc = mb86a20s_readreg(state, 0x46);
1408         if (rc < 0)
1409                 return rc;
1410         cnr_linear |= rc;
1411 
1412         cnr = interpolate_value(cnr_linear,
1413                                 cnr_to_db_table, ARRAY_SIZE(cnr_to_db_table));
1414 
1415         c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
1416         c->cnr.stat[0].svalue = cnr;
1417 
1418         dev_dbg(&state->i2c->dev, "%s: CNR is %d.%03d dB (%d)\n",
1419                 __func__, cnr / 1000, cnr % 1000, cnr_linear);
1420 
1421         /* CNR counter reset */
1422         rc = mb86a20s_writereg(state, 0x45, val | 0x10);
1423         if (rc < 0)
1424                 return rc;
1425         rc = mb86a20s_writereg(state, 0x45, val & 0x6f);
1426 
1427         return rc;
1428 }
1429 
1430 static int mb86a20s_get_blk_error_layer_CNR(struct dvb_frontend *fe)
1431 {
1432         struct mb86a20s_state *state = fe->demodulator_priv;
1433         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1434         u32 mer, cnr;
1435         int rc, val, layer;
1436         const struct linear_segments *segs;
1437         unsigned segs_len;
1438 
1439         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1440 
1441         /* Check if the measures are already available */
1442         rc = mb86a20s_writereg(state, 0x50, 0x5b);
1443         if (rc < 0)
1444                 return rc;
1445         rc = mb86a20s_readreg(state, 0x51);
1446         if (rc < 0)
1447                 return rc;
1448 
1449         /* Check if data is available */
1450         if (!(rc & 0x01)) {
1451                 dev_dbg(&state->i2c->dev,
1452                         "%s: MER measures aren't available yet.\n", __func__);
1453                 return -EBUSY;
1454         }
1455 
1456         /* Read all layers */
1457         for (layer = 0; layer < NUM_LAYERS; layer++) {
1458                 if (!(c->isdbt_layer_enabled & (1 << layer))) {
1459                         c->cnr.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1460                         continue;
1461                 }
1462 
1463                 rc = mb86a20s_writereg(state, 0x50, 0x52 + layer * 3);
1464                 if (rc < 0)
1465                         return rc;
1466                 rc = mb86a20s_readreg(state, 0x51);
1467                 if (rc < 0)
1468                         return rc;
1469                 mer = rc << 16;
1470                 rc = mb86a20s_writereg(state, 0x50, 0x53 + layer * 3);
1471                 if (rc < 0)
1472                         return rc;
1473                 rc = mb86a20s_readreg(state, 0x51);
1474                 if (rc < 0)
1475                         return rc;
1476                 mer |= rc << 8;
1477                 rc = mb86a20s_writereg(state, 0x50, 0x54 + layer * 3);
1478                 if (rc < 0)
1479                         return rc;
1480                 rc = mb86a20s_readreg(state, 0x51);
1481                 if (rc < 0)
1482                         return rc;
1483                 mer |= rc;
1484 
1485                 switch (c->layer[layer].modulation) {
1486                 case DQPSK:
1487                 case QPSK:
1488                         segs = cnr_qpsk_table;
1489                         segs_len = ARRAY_SIZE(cnr_qpsk_table);
1490                         break;
1491                 case QAM_16:
1492                         segs = cnr_16qam_table;
1493                         segs_len = ARRAY_SIZE(cnr_16qam_table);
1494                         break;
1495                 default:
1496                 case QAM_64:
1497                         segs = cnr_64qam_table;
1498                         segs_len = ARRAY_SIZE(cnr_64qam_table);
1499                         break;
1500                 }
1501                 cnr = interpolate_value(mer, segs, segs_len);
1502 
1503                 c->cnr.stat[1 + layer].scale = FE_SCALE_DECIBEL;
1504                 c->cnr.stat[1 + layer].svalue = cnr;
1505 
1506                 dev_dbg(&state->i2c->dev,
1507                         "%s: CNR for layer %c is %d.%03d dB (MER = %d).\n",
1508                         __func__, 'A' + layer, cnr / 1000, cnr % 1000, mer);
1509 
1510         }
1511 
1512         /* Start a new MER measurement */
1513         /* MER counter reset */
1514         rc = mb86a20s_writereg(state, 0x50, 0x50);
1515         if (rc < 0)
1516                 return rc;
1517         rc = mb86a20s_readreg(state, 0x51);
1518         if (rc < 0)
1519                 return rc;
1520         val = rc;
1521 
1522         rc = mb86a20s_writereg(state, 0x51, val | 0x01);
1523         if (rc < 0)
1524                 return rc;
1525         rc = mb86a20s_writereg(state, 0x51, val & 0x06);
1526         if (rc < 0)
1527                 return rc;
1528 
1529         return 0;
1530 }
1531 
1532 static void mb86a20s_stats_not_ready(struct dvb_frontend *fe)
1533 {
1534         struct mb86a20s_state *state = fe->demodulator_priv;
1535         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1536         int layer;
1537 
1538         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1539 
1540         /* Fill the length of each status counter */
1541 
1542         /* Only global stats */
1543         c->strength.len = 1;
1544 
1545         /* Per-layer stats - 3 layers + global */
1546         c->cnr.len = NUM_LAYERS + 1;
1547         c->pre_bit_error.len = NUM_LAYERS + 1;
1548         c->pre_bit_count.len = NUM_LAYERS + 1;
1549         c->post_bit_error.len = NUM_LAYERS + 1;
1550         c->post_bit_count.len = NUM_LAYERS + 1;
1551         c->block_error.len = NUM_LAYERS + 1;
1552         c->block_count.len = NUM_LAYERS + 1;
1553 
1554         /* Signal is always available */
1555         c->strength.stat[0].scale = FE_SCALE_RELATIVE;
1556         c->strength.stat[0].uvalue = 0;
1557 
1558         /* Put all of them at FE_SCALE_NOT_AVAILABLE */
1559         for (layer = 0; layer < NUM_LAYERS + 1; layer++) {
1560                 c->cnr.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1561                 c->pre_bit_error.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1562                 c->pre_bit_count.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1563                 c->post_bit_error.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1564                 c->post_bit_count.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1565                 c->block_error.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1566                 c->block_count.stat[layer].scale = FE_SCALE_NOT_AVAILABLE;
1567         }
1568 }
1569 
1570 static int mb86a20s_get_stats(struct dvb_frontend *fe, int status_nr)
1571 {
1572         struct mb86a20s_state *state = fe->demodulator_priv;
1573         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1574         int rc = 0, layer;
1575         u32 bit_error = 0, bit_count = 0;
1576         u32 t_pre_bit_error = 0, t_pre_bit_count = 0;
1577         u32 t_post_bit_error = 0, t_post_bit_count = 0;
1578         u32 block_error = 0, block_count = 0;
1579         u32 t_block_error = 0, t_block_count = 0;
1580         int active_layers = 0, pre_ber_layers = 0, post_ber_layers = 0;
1581         int per_layers = 0;
1582 
1583         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1584 
1585         mb86a20s_get_main_CNR(fe);
1586 
1587         /* Get per-layer stats */
1588         mb86a20s_get_blk_error_layer_CNR(fe);
1589 
1590         /*
1591          * At state 7, only CNR is available
1592          * For BER measures, state=9 is required
1593          * FIXME: we may get MER measures with state=8
1594          */
1595         if (status_nr < 9)
1596                 return 0;
1597 
1598         for (layer = 0; layer < NUM_LAYERS; layer++) {
1599                 if (c->isdbt_layer_enabled & (1 << layer)) {
1600                         /* Layer is active and has rc segments */
1601                         active_layers++;
1602 
1603                         /* Handle BER before vterbi */
1604                         rc = mb86a20s_get_pre_ber(fe, layer,
1605                                                   &bit_error, &bit_count);
1606                         if (rc >= 0) {
1607                                 c->pre_bit_error.stat[1 + layer].scale = FE_SCALE_COUNTER;
1608                                 c->pre_bit_error.stat[1 + layer].uvalue += bit_error;
1609                                 c->pre_bit_count.stat[1 + layer].scale = FE_SCALE_COUNTER;
1610                                 c->pre_bit_count.stat[1 + layer].uvalue += bit_count;
1611                         } else if (rc != -EBUSY) {
1612                                 /*
1613                                         * If an I/O error happened,
1614                                         * measures are now unavailable
1615                                         */
1616                                 c->pre_bit_error.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1617                                 c->pre_bit_count.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1618                                 dev_err(&state->i2c->dev,
1619                                         "%s: Can't get BER for layer %c (error %d).\n",
1620                                         __func__, 'A' + layer, rc);
1621                         }
1622                         if (c->block_error.stat[1 + layer].scale != FE_SCALE_NOT_AVAILABLE)
1623                                 pre_ber_layers++;
1624 
1625                         /* Handle BER post vterbi */
1626                         rc = mb86a20s_get_post_ber(fe, layer,
1627                                                    &bit_error, &bit_count);
1628                         if (rc >= 0) {
1629                                 c->post_bit_error.stat[1 + layer].scale = FE_SCALE_COUNTER;
1630                                 c->post_bit_error.stat[1 + layer].uvalue += bit_error;
1631                                 c->post_bit_count.stat[1 + layer].scale = FE_SCALE_COUNTER;
1632                                 c->post_bit_count.stat[1 + layer].uvalue += bit_count;
1633                         } else if (rc != -EBUSY) {
1634                                 /*
1635                                         * If an I/O error happened,
1636                                         * measures are now unavailable
1637                                         */
1638                                 c->post_bit_error.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1639                                 c->post_bit_count.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1640                                 dev_err(&state->i2c->dev,
1641                                         "%s: Can't get BER for layer %c (error %d).\n",
1642                                         __func__, 'A' + layer, rc);
1643                         }
1644                         if (c->block_error.stat[1 + layer].scale != FE_SCALE_NOT_AVAILABLE)
1645                                 post_ber_layers++;
1646 
1647                         /* Handle Block errors for PER/UCB reports */
1648                         rc = mb86a20s_get_blk_error(fe, layer,
1649                                                 &block_error,
1650                                                 &block_count);
1651                         if (rc >= 0) {
1652                                 c->block_error.stat[1 + layer].scale = FE_SCALE_COUNTER;
1653                                 c->block_error.stat[1 + layer].uvalue += block_error;
1654                                 c->block_count.stat[1 + layer].scale = FE_SCALE_COUNTER;
1655                                 c->block_count.stat[1 + layer].uvalue += block_count;
1656                         } else if (rc != -EBUSY) {
1657                                 /*
1658                                         * If an I/O error happened,
1659                                         * measures are now unavailable
1660                                         */
1661                                 c->block_error.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1662                                 c->block_count.stat[1 + layer].scale = FE_SCALE_NOT_AVAILABLE;
1663                                 dev_err(&state->i2c->dev,
1664                                         "%s: Can't get PER for layer %c (error %d).\n",
1665                                         __func__, 'A' + layer, rc);
1666 
1667                         }
1668                         if (c->block_error.stat[1 + layer].scale != FE_SCALE_NOT_AVAILABLE)
1669                                 per_layers++;
1670 
1671                         /* Update total preBER */
1672                         t_pre_bit_error += c->pre_bit_error.stat[1 + layer].uvalue;
1673                         t_pre_bit_count += c->pre_bit_count.stat[1 + layer].uvalue;
1674 
1675                         /* Update total postBER */
1676                         t_post_bit_error += c->post_bit_error.stat[1 + layer].uvalue;
1677                         t_post_bit_count += c->post_bit_count.stat[1 + layer].uvalue;
1678 
1679                         /* Update total PER */
1680                         t_block_error += c->block_error.stat[1 + layer].uvalue;
1681                         t_block_count += c->block_count.stat[1 + layer].uvalue;
1682                 }
1683         }
1684 
1685         /*
1686          * Start showing global count if at least one error count is
1687          * available.
1688          */
1689         if (pre_ber_layers) {
1690                 /*
1691                  * At least one per-layer BER measure was read. We can now
1692                  * calculate the total BER
1693                  *
1694                  * Total Bit Error/Count is calculated as the sum of the
1695                  * bit errors on all active layers.
1696                  */
1697                 c->pre_bit_error.stat[0].scale = FE_SCALE_COUNTER;
1698                 c->pre_bit_error.stat[0].uvalue = t_pre_bit_error;
1699                 c->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
1700                 c->pre_bit_count.stat[0].uvalue = t_pre_bit_count;
1701         } else {
1702                 c->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1703                 c->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
1704         }
1705 
1706         /*
1707          * Start showing global count if at least one error count is
1708          * available.
1709          */
1710         if (post_ber_layers) {
1711                 /*
1712                  * At least one per-layer BER measure was read. We can now
1713                  * calculate the total BER
1714                  *
1715                  * Total Bit Error/Count is calculated as the sum of the
1716                  * bit errors on all active layers.
1717                  */
1718                 c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
1719                 c->post_bit_error.stat[0].uvalue = t_post_bit_error;
1720                 c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
1721                 c->post_bit_count.stat[0].uvalue = t_post_bit_count;
1722         } else {
1723                 c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1724                 c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
1725         }
1726 
1727         if (per_layers) {
1728                 /*
1729                  * At least one per-layer UCB measure was read. We can now
1730                  * calculate the total UCB
1731                  *
1732                  * Total block Error/Count is calculated as the sum of the
1733                  * block errors on all active layers.
1734                  */
1735                 c->block_error.stat[0].scale = FE_SCALE_COUNTER;
1736                 c->block_error.stat[0].uvalue = t_block_error;
1737                 c->block_count.stat[0].scale = FE_SCALE_COUNTER;
1738                 c->block_count.stat[0].uvalue = t_block_count;
1739         } else {
1740                 c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
1741                 c->block_count.stat[0].scale = FE_SCALE_COUNTER;
1742         }
1743 
1744         return rc;
1745 }
1746 
1747 /*
1748  * The functions below are called via DVB callbacks, so they need to
1749  * properly use the I2C gate control
1750  */
1751 
1752 static int mb86a20s_initfe(struct dvb_frontend *fe)
1753 {
1754         struct mb86a20s_state *state = fe->demodulator_priv;
1755         u64 pll;
1756         u32 fclk;
1757         int rc;
1758         u8  regD5 = 1, reg71, reg09 = 0x3a;
1759 
1760         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1761 
1762         if (fe->ops.i2c_gate_ctrl)
1763                 fe->ops.i2c_gate_ctrl(fe, 0);
1764 
1765         /* Initialize the frontend */
1766         rc = mb86a20s_writeregdata(state, mb86a20s_init1);
1767         if (rc < 0)
1768                 goto err;
1769 
1770         if (!state->inversion)
1771                 reg09 |= 0x04;
1772         rc = mb86a20s_writereg(state, 0x09, reg09);
1773         if (rc < 0)
1774                 goto err;
1775         if (!state->bw)
1776                 reg71 = 1;
1777         else
1778                 reg71 = 0;
1779         rc = mb86a20s_writereg(state, 0x39, reg71);
1780         if (rc < 0)
1781                 goto err;
1782         rc = mb86a20s_writereg(state, 0x71, state->bw);
1783         if (rc < 0)
1784                 goto err;
1785         if (state->subchannel) {
1786                 rc = mb86a20s_writereg(state, 0x44, state->subchannel);
1787                 if (rc < 0)
1788                         goto err;
1789         }
1790 
1791         fclk = state->config->fclk;
1792         if (!fclk)
1793                 fclk = 32571428;
1794 
1795         /* Adjust IF frequency to match tuner */
1796         if (fe->ops.tuner_ops.get_if_frequency)
1797                 fe->ops.tuner_ops.get_if_frequency(fe, &state->if_freq);
1798 
1799         if (!state->if_freq)
1800                 state->if_freq = 3300000;
1801 
1802         pll = (((u64)1) << 34) * state->if_freq;
1803         do_div(pll, 63 * fclk);
1804         pll = (1 << 25) - pll;
1805         rc = mb86a20s_writereg(state, 0x28, 0x2a);
1806         if (rc < 0)
1807                 goto err;
1808         rc = mb86a20s_writereg(state, 0x29, (pll >> 16) & 0xff);
1809         if (rc < 0)
1810                 goto err;
1811         rc = mb86a20s_writereg(state, 0x2a, (pll >> 8) & 0xff);
1812         if (rc < 0)
1813                 goto err;
1814         rc = mb86a20s_writereg(state, 0x2b, pll & 0xff);
1815         if (rc < 0)
1816                 goto err;
1817         dev_dbg(&state->i2c->dev, "%s: fclk=%d, IF=%d, clock reg=0x%06llx\n",
1818                 __func__, fclk, state->if_freq, (long long)pll);
1819 
1820         /* pll = freq[Hz] * 2^24/10^6 / 16.285714286 */
1821         pll = state->if_freq * 1677721600L;
1822         do_div(pll, 1628571429L);
1823         rc = mb86a20s_writereg(state, 0x28, 0x20);
1824         if (rc < 0)
1825                 goto err;
1826         rc = mb86a20s_writereg(state, 0x29, (pll >> 16) & 0xff);
1827         if (rc < 0)
1828                 goto err;
1829         rc = mb86a20s_writereg(state, 0x2a, (pll >> 8) & 0xff);
1830         if (rc < 0)
1831                 goto err;
1832         rc = mb86a20s_writereg(state, 0x2b, pll & 0xff);
1833         if (rc < 0)
1834                 goto err;
1835         dev_dbg(&state->i2c->dev, "%s: IF=%d, IF reg=0x%06llx\n",
1836                 __func__, state->if_freq, (long long)pll);
1837 
1838         if (!state->config->is_serial)
1839                 regD5 &= ~1;
1840 
1841         rc = mb86a20s_writereg(state, 0x50, 0xd5);
1842         if (rc < 0)
1843                 goto err;
1844         rc = mb86a20s_writereg(state, 0x51, regD5);
1845         if (rc < 0)
1846                 goto err;
1847 
1848         rc = mb86a20s_writeregdata(state, mb86a20s_init2);
1849         if (rc < 0)
1850                 goto err;
1851 
1852 
1853 err:
1854         if (fe->ops.i2c_gate_ctrl)
1855                 fe->ops.i2c_gate_ctrl(fe, 1);
1856 
1857         if (rc < 0) {
1858                 state->need_init = true;
1859                 dev_info(&state->i2c->dev,
1860                          "mb86a20s: Init failed. Will try again later\n");
1861         } else {
1862                 state->need_init = false;
1863                 dev_dbg(&state->i2c->dev, "Initialization succeeded.\n");
1864         }
1865         return rc;
1866 }
1867 
1868 static int mb86a20s_set_frontend(struct dvb_frontend *fe)
1869 {
1870         struct mb86a20s_state *state = fe->demodulator_priv;
1871         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
1872         int rc, if_freq;
1873         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1874 
1875         if (!c->isdbt_layer_enabled)
1876                 c->isdbt_layer_enabled = 7;
1877 
1878         if (c->isdbt_layer_enabled == 1)
1879                 state->bw = MB86A20S_1SEG;
1880         else if (c->isdbt_partial_reception)
1881                 state->bw = MB86A20S_13SEG_PARTIAL;
1882         else
1883                 state->bw = MB86A20S_13SEG;
1884 
1885         if (c->inversion == INVERSION_ON)
1886                 state->inversion = true;
1887         else
1888                 state->inversion = false;
1889 
1890         if (!c->isdbt_sb_mode) {
1891                 state->subchannel = 0;
1892         } else {
1893                 if (c->isdbt_sb_subchannel >= ARRAY_SIZE(mb86a20s_subchannel))
1894                         c->isdbt_sb_subchannel = 0;
1895 
1896                 state->subchannel = mb86a20s_subchannel[c->isdbt_sb_subchannel];
1897         }
1898 
1899         /*
1900          * Gate should already be opened, but it doesn't hurt to
1901          * double-check
1902          */
1903         if (fe->ops.i2c_gate_ctrl)
1904                 fe->ops.i2c_gate_ctrl(fe, 1);
1905         fe->ops.tuner_ops.set_params(fe);
1906 
1907         if (fe->ops.tuner_ops.get_if_frequency)
1908                 fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
1909 
1910         /*
1911          * Make it more reliable: if, for some reason, the initial
1912          * device initialization doesn't happen, initialize it when
1913          * a SBTVD parameters are adjusted.
1914          *
1915          * Unfortunately, due to a hard to track bug at tda829x/tda18271,
1916          * the agc callback logic is not called during DVB attach time,
1917          * causing mb86a20s to not be initialized with Kworld SBTVD.
1918          * So, this hack is needed, in order to make Kworld SBTVD to work.
1919          *
1920          * It is also needed to change the IF after the initial init.
1921          *
1922          * HACK: Always init the frontend when set_frontend is called:
1923          * it was noticed that, on some devices, it fails to lock on a
1924          * different channel. So, it is better to reset everything, even
1925          * wasting some time, than to loose channel lock.
1926          */
1927         mb86a20s_initfe(fe);
1928 
1929         if (fe->ops.i2c_gate_ctrl)
1930                 fe->ops.i2c_gate_ctrl(fe, 0);
1931 
1932         rc = mb86a20s_writeregdata(state, mb86a20s_reset_reception);
1933         mb86a20s_reset_counters(fe);
1934         mb86a20s_stats_not_ready(fe);
1935 
1936         if (fe->ops.i2c_gate_ctrl)
1937                 fe->ops.i2c_gate_ctrl(fe, 1);
1938 
1939         return rc;
1940 }
1941 
1942 static int mb86a20s_read_status_and_stats(struct dvb_frontend *fe,
1943                                           enum fe_status *status)
1944 {
1945         struct mb86a20s_state *state = fe->demodulator_priv;
1946         int rc, status_nr;
1947 
1948         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
1949 
1950         if (fe->ops.i2c_gate_ctrl)
1951                 fe->ops.i2c_gate_ctrl(fe, 0);
1952 
1953         /* Get lock */
1954         status_nr = mb86a20s_read_status(fe, status);
1955         if (status_nr < 7) {
1956                 mb86a20s_stats_not_ready(fe);
1957                 mb86a20s_reset_frontend_cache(fe);
1958         }
1959         if (status_nr < 0) {
1960                 dev_err(&state->i2c->dev,
1961                         "%s: Can't read frontend lock status\n", __func__);
1962                 rc = status_nr;
1963                 goto error;
1964         }
1965 
1966         /* Get signal strength */
1967         rc = mb86a20s_read_signal_strength(fe);
1968         if (rc < 0) {
1969                 dev_err(&state->i2c->dev,
1970                         "%s: Can't reset VBER registers.\n", __func__);
1971                 mb86a20s_stats_not_ready(fe);
1972                 mb86a20s_reset_frontend_cache(fe);
1973 
1974                 rc = 0;         /* Status is OK */
1975                 goto error;
1976         }
1977 
1978         if (status_nr >= 7) {
1979                 /* Get TMCC info*/
1980                 rc = mb86a20s_get_frontend(fe);
1981                 if (rc < 0) {
1982                         dev_err(&state->i2c->dev,
1983                                 "%s: Can't get FE TMCC data.\n", __func__);
1984                         rc = 0;         /* Status is OK */
1985                         goto error;
1986                 }
1987 
1988                 /* Get statistics */
1989                 rc = mb86a20s_get_stats(fe, status_nr);
1990                 if (rc < 0 && rc != -EBUSY) {
1991                         dev_err(&state->i2c->dev,
1992                                 "%s: Can't get FE statistics.\n", __func__);
1993                         rc = 0;
1994                         goto error;
1995                 }
1996                 rc = 0; /* Don't return EBUSY to userspace */
1997         }
1998         goto ok;
1999 
2000 error:
2001         mb86a20s_stats_not_ready(fe);
2002 
2003 ok:
2004         if (fe->ops.i2c_gate_ctrl)
2005                 fe->ops.i2c_gate_ctrl(fe, 1);
2006 
2007         return rc;
2008 }
2009 
2010 static int mb86a20s_read_signal_strength_from_cache(struct dvb_frontend *fe,
2011                                                     u16 *strength)
2012 {
2013         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
2014 
2015 
2016         *strength = c->strength.stat[0].uvalue;
2017 
2018         return 0;
2019 }
2020 
2021 static int mb86a20s_tune(struct dvb_frontend *fe,
2022                         bool re_tune,
2023                         unsigned int mode_flags,
2024                         unsigned int *delay,
2025                         enum fe_status *status)
2026 {
2027         struct mb86a20s_state *state = fe->demodulator_priv;
2028         int rc = 0;
2029 
2030         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
2031 
2032         if (re_tune)
2033                 rc = mb86a20s_set_frontend(fe);
2034 
2035         if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
2036                 mb86a20s_read_status_and_stats(fe, status);
2037 
2038         return rc;
2039 }
2040 
2041 static void mb86a20s_release(struct dvb_frontend *fe)
2042 {
2043         struct mb86a20s_state *state = fe->demodulator_priv;
2044 
2045         dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
2046 
2047         kfree(state);
2048 }
2049 
2050 static enum dvbfe_algo mb86a20s_get_frontend_algo(struct dvb_frontend *fe)
2051 {
2052         return DVBFE_ALGO_HW;
2053 }
2054 
2055 static const struct dvb_frontend_ops mb86a20s_ops;
2056 
2057 struct dvb_frontend *mb86a20s_attach(const struct mb86a20s_config *config,
2058                                     struct i2c_adapter *i2c)
2059 {
2060         struct mb86a20s_state *state;
2061         u8      rev;
2062 
2063         dev_dbg(&i2c->dev, "%s called.\n", __func__);
2064 
2065         /* allocate memory for the internal state */
2066         state = kzalloc(sizeof(*state), GFP_KERNEL);
2067         if (!state)
2068                 return NULL;
2069 
2070         /* setup the state */
2071         state->config = config;
2072         state->i2c = i2c;
2073 
2074         /* create dvb_frontend */
2075         memcpy(&state->frontend.ops, &mb86a20s_ops,
2076                 sizeof(struct dvb_frontend_ops));
2077         state->frontend.demodulator_priv = state;
2078 
2079         /* Check if it is a mb86a20s frontend */
2080         rev = mb86a20s_readreg(state, 0);
2081         if (rev != 0x13) {
2082                 kfree(state);
2083                 dev_dbg(&i2c->dev,
2084                         "Frontend revision %d is unknown - aborting.\n",
2085                        rev);
2086                 return NULL;
2087         }
2088 
2089         dev_info(&i2c->dev, "Detected a Fujitsu mb86a20s frontend\n");
2090         return &state->frontend;
2091 }
2092 EXPORT_SYMBOL(mb86a20s_attach);
2093 
2094 static const struct dvb_frontend_ops mb86a20s_ops = {
2095         .delsys = { SYS_ISDBT },
2096         /* Use dib8000 values per default */
2097         .info = {
2098                 .name = "Fujitsu mb86A20s",
2099                 .caps = FE_CAN_RECOVER  |
2100                         FE_CAN_FEC_1_2  | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
2101                         FE_CAN_FEC_5_6  | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
2102                         FE_CAN_QPSK     | FE_CAN_QAM_16  | FE_CAN_QAM_64 |
2103                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_QAM_AUTO |
2104                         FE_CAN_GUARD_INTERVAL_AUTO    | FE_CAN_HIERARCHY_AUTO,
2105                 /* Actually, those values depend on the used tuner */
2106                 .frequency_min_hz =  45 * MHz,
2107                 .frequency_max_hz = 864 * MHz,
2108                 .frequency_stepsize_hz = 62500,
2109         },
2110 
2111         .release = mb86a20s_release,
2112 
2113         .init = mb86a20s_initfe,
2114         .set_frontend = mb86a20s_set_frontend,
2115         .read_status = mb86a20s_read_status_and_stats,
2116         .read_signal_strength = mb86a20s_read_signal_strength_from_cache,
2117         .tune = mb86a20s_tune,
2118         .get_frontend_algo = mb86a20s_get_frontend_algo,
2119 };
2120 
2121 MODULE_DESCRIPTION("DVB Frontend module for Fujitsu mb86A20s hardware");
2122 MODULE_AUTHOR("Mauro Carvalho Chehab");
2123 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/dvb-frontends/mb86a20s.c

DEFINITIONS
