drivers/media/tuners/qm1d1c0042.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sharp QM1D1C0042 8PSK tuner driver
   4  *
   5  * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
   6  */
   7
   8 /*
   9  * NOTICE:
  10  * As the disclosed information on the chip is very limited,
  11  * this driver lacks some features, including chip config like IF freq.
  12  * It assumes that users of this driver (such as a PCI bridge of
  13  * DTV receiver cards) know the relevant info and
  14  * configure the chip via I2C if necessary.
  15  *
  16  * Currently, PT3 driver is the only one that uses this driver,
  17  * and contains init/config code in its firmware.
  18  * Thus some part of the code might be dependent on PT3 specific config.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/math64.h>
  23 #include "qm1d1c0042.h"
  24
  25 #define QM1D1C0042_NUM_REGS 0x20
  26 #define QM1D1C0042_NUM_REG_ROWS 2
  27
  28 static const u8
  29 reg_initval[QM1D1C0042_NUM_REG_ROWS][QM1D1C0042_NUM_REGS] = { {
  30                 0x48, 0x1c, 0xa0, 0x10, 0xbc, 0xc5, 0x20, 0x33,
  31                 0x06, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
  32                 0x00, 0xff, 0xf3, 0x00, 0x2a, 0x64, 0xa6, 0x86,
  33                 0x8c, 0xcf, 0xb8, 0xf1, 0xa8, 0xf2, 0x89, 0x00
  34         }, {
  35                 0x68, 0x1c, 0xc0, 0x10, 0xbc, 0xc1, 0x11, 0x33,
  36                 0x03, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
  37                 0x00, 0xff, 0xf3, 0x00, 0x3f, 0x25, 0x5c, 0xd6,
  38                 0x55, 0xcf, 0x95, 0xf6, 0x36, 0xf2, 0x09, 0x00
  39         }
  40 };
  41
  42 static int reg_index;
  43
  44 static const struct qm1d1c0042_config default_cfg = {
  45         .xtal_freq = 16000,
  46         .lpf = 1,
  47         .fast_srch = 0,
  48         .lpf_wait = 20,
  49         .fast_srch_wait = 4,
  50         .normal_srch_wait = 15,
  51 };
  52
  53 struct qm1d1c0042_state {
  54         struct qm1d1c0042_config cfg;
  55         struct i2c_client *i2c;
  56         u8 regs[QM1D1C0042_NUM_REGS];
  57 };
  58
  59 static struct qm1d1c0042_state *cfg_to_state(struct qm1d1c0042_config *c)
  60 {
  61         return container_of(c, struct qm1d1c0042_state, cfg);
  62 }
  63
  64 static int reg_write(struct qm1d1c0042_state *state, u8 reg, u8 val)
  65 {
  66         u8 wbuf[2] = { reg, val };
  67         int ret;
  68
  69         ret = i2c_master_send(state->i2c, wbuf, sizeof(wbuf));
  70         if (ret >= 0 && ret < sizeof(wbuf))
  71                 ret = -EIO;
  72         return (ret == sizeof(wbuf)) ? 0 : ret;
  73 }
  74
  75 static int reg_read(struct qm1d1c0042_state *state, u8 reg, u8 *val)
  76 {
  77         struct i2c_msg msgs[2] = {
  78                 {
  79                         .addr = state->i2c->addr,
  80                         .flags = 0,
  81                         .buf = &reg,
  82                         .len = 1,
  83                 },
  84                 {
  85                         .addr = state->i2c->addr,
  86                         .flags = I2C_M_RD,
  87                         .buf = val,
  88                         .len = 1,
  89                 },
  90         };
  91         int ret;
  92
  93         ret = i2c_transfer(state->i2c->adapter, msgs, ARRAY_SIZE(msgs));
  94         if (ret >= 0 && ret < ARRAY_SIZE(msgs))
  95                 ret = -EIO;
  96         return (ret == ARRAY_SIZE(msgs)) ? 0 : ret;
  97 }
  98
  99
 100 static int qm1d1c0042_set_srch_mode(struct qm1d1c0042_state *state, bool fast)
 101 {
 102         if (fast)
 103                 state->regs[0x03] |= 0x01; /* set fast search mode */
 104         else
 105                 state->regs[0x03] &= ~0x01 & 0xff;
 106
 107         return reg_write(state, 0x03, state->regs[0x03]);
 108 }
 109
 110 static int qm1d1c0042_wakeup(struct qm1d1c0042_state *state)
 111 {
 112         int ret;
 113
 114         state->regs[0x01] |= 1 << 3;             /* BB_Reg_enable */
 115         state->regs[0x01] &= (~(1 << 0)) & 0xff; /* NORMAL (wake-up) */
 116         state->regs[0x05] &= (~(1 << 3)) & 0xff; /* pfd_rst NORMAL */
 117         ret = reg_write(state, 0x01, state->regs[0x01]);
 118         if (ret == 0)
 119                 ret = reg_write(state, 0x05, state->regs[0x05]);
 120
 121         if (ret < 0)
 122                 dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
 123                         __func__, state->cfg.fe->dvb->num, state->cfg.fe->id);
 124         return ret;
 125 }
 126
 127 /* tuner_ops */
 128
 129 static int qm1d1c0042_set_config(struct dvb_frontend *fe, void *priv_cfg)
 130 {
 131         struct qm1d1c0042_state *state;
 132         struct qm1d1c0042_config *cfg;
 133
 134         state = fe->tuner_priv;
 135         cfg = priv_cfg;
 136
 137         if (cfg->fe)
 138                 state->cfg.fe = cfg->fe;
 139
 140         if (cfg->xtal_freq != QM1D1C0042_CFG_XTAL_DFLT)
 141                 dev_warn(&state->i2c->dev,
 142                         "(%s) changing xtal_freq not supported. ", __func__);
 143         state->cfg.xtal_freq = default_cfg.xtal_freq;
 144
 145         state->cfg.lpf = cfg->lpf;
 146         state->cfg.fast_srch = cfg->fast_srch;
 147
 148         if (cfg->lpf_wait != QM1D1C0042_CFG_WAIT_DFLT)
 149                 state->cfg.lpf_wait = cfg->lpf_wait;
 150         else
 151                 state->cfg.lpf_wait = default_cfg.lpf_wait;
 152
 153         if (cfg->fast_srch_wait != QM1D1C0042_CFG_WAIT_DFLT)
 154                 state->cfg.fast_srch_wait = cfg->fast_srch_wait;
 155         else
 156                 state->cfg.fast_srch_wait = default_cfg.fast_srch_wait;
 157
 158         if (cfg->normal_srch_wait != QM1D1C0042_CFG_WAIT_DFLT)
 159                 state->cfg.normal_srch_wait = cfg->normal_srch_wait;
 160         else
 161                 state->cfg.normal_srch_wait = default_cfg.normal_srch_wait;
 162         return 0;
 163 }
 164
 165 /* divisor, vco_band parameters */
 166 /*  {maxfreq,  param1(band?), param2(div?) */
 167 static const u32 conv_table[9][3] = {
 168         { 2151000, 1, 7 },
 169         { 1950000, 1, 6 },
 170         { 1800000, 1, 5 },
 171         { 1600000, 1, 4 },
 172         { 1450000, 1, 3 },
 173         { 1250000, 1, 2 },
 174         { 1200000, 0, 7 },
 175         {  975000, 0, 6 },
 176         {  950000, 0, 0 }
 177 };
 178
 179 static int qm1d1c0042_set_params(struct dvb_frontend *fe)
 180 {
 181         struct qm1d1c0042_state *state;
 182         u32 freq;
 183         int i, ret;
 184         u8 val, mask;
 185         u32 a, sd;
 186         s32 b;
 187
 188         state = fe->tuner_priv;
 189         freq = fe->dtv_property_cache.frequency;
 190
 191         state->regs[0x08] &= 0xf0;
 192         state->regs[0x08] |= 0x09;
 193
 194         state->regs[0x13] &= 0x9f;
 195         state->regs[0x13] |= 0x20;
 196
 197         /* div2/vco_band */
 198         val = state->regs[0x02] & 0x0f;
 199         for (i = 0; i < 8; i++)
 200                 if (freq < conv_table[i][0] && freq >= conv_table[i + 1][0]) {
 201                         val |= conv_table[i][1] << 7;
 202                         val |= conv_table[i][2] << 4;
 203                         break;
 204                 }
 205         ret = reg_write(state, 0x02, val);
 206         if (ret < 0)
 207                 return ret;
 208
 209         a = DIV_ROUND_CLOSEST(freq, state->cfg.xtal_freq);
 210
 211         state->regs[0x06] &= 0x40;
 212         state->regs[0x06] |= (a - 12) / 4;
 213         ret = reg_write(state, 0x06, state->regs[0x06]);
 214         if (ret < 0)
 215                 return ret;
 216
 217         state->regs[0x07] &= 0xf0;
 218         state->regs[0x07] |= (a - 4 * ((a - 12) / 4 + 1) - 5) & 0x0f;
 219         ret = reg_write(state, 0x07, state->regs[0x07]);
 220         if (ret < 0)
 221                 return ret;
 222
 223         /* LPF */
 224         val = state->regs[0x08];
 225         if (state->cfg.lpf) {
 226                 /* LPF_CLK, LPF_FC */
 227                 val &= 0xf0;
 228                 val |= 0x02;
 229         }
 230         ret = reg_write(state, 0x08, val);
 231         if (ret < 0)
 232                 return ret;
 233
 234         /*
 235          * b = (freq / state->cfg.xtal_freq - a) << 20;
 236          * sd = b          (b >= 0)
 237          *      1<<22 + b  (b < 0)
 238          */
 239         b = (s32)div64_s64(((s64) freq) << 20, state->cfg.xtal_freq)
 240                            - (((s64) a) << 20);
 241
 242         if (b >= 0)
 243                 sd = b;
 244         else
 245                 sd = (1 << 22) + b;
 246
 247         state->regs[0x09] &= 0xc0;
 248         state->regs[0x09] |= (sd >> 16) & 0x3f;
 249         state->regs[0x0a] = (sd >> 8) & 0xff;
 250         state->regs[0x0b] = sd & 0xff;
 251         ret = reg_write(state, 0x09, state->regs[0x09]);
 252         if (ret == 0)
 253                 ret = reg_write(state, 0x0a, state->regs[0x0a]);
 254         if (ret == 0)
 255                 ret = reg_write(state, 0x0b, state->regs[0x0b]);
 256         if (ret != 0)
 257                 return ret;
 258
 259         if (!state->cfg.lpf) {
 260                 /* CSEL_Offset */
 261                 ret = reg_write(state, 0x13, state->regs[0x13]);
 262                 if (ret < 0)
 263                         return ret;
 264         }
 265
 266         /* VCO_TM, LPF_TM */
 267         mask = state->cfg.lpf ? 0x3f : 0x7f;
 268         val = state->regs[0x0c] & mask;
 269         ret = reg_write(state, 0x0c, val);
 270         if (ret < 0)
 271                 return ret;
 272         usleep_range(2000, 3000);
 273         val = state->regs[0x0c] | ~mask;
 274         ret = reg_write(state, 0x0c, val);
 275         if (ret < 0)
 276                 return ret;
 277
 278         if (state->cfg.lpf)
 279                 msleep(state->cfg.lpf_wait);
 280         else if (state->regs[0x03] & 0x01)
 281                 msleep(state->cfg.fast_srch_wait);
 282         else
 283                 msleep(state->cfg.normal_srch_wait);
 284
 285         if (state->cfg.lpf) {
 286                 /* LPF_FC */
 287                 ret = reg_write(state, 0x08, 0x09);
 288                 if (ret < 0)
 289                         return ret;
 290
 291                 /* CSEL_Offset */
 292                 ret = reg_write(state, 0x13, state->regs[0x13]);
 293                 if (ret < 0)
 294                         return ret;
 295         }
 296         return 0;
 297 }
 298
 299 static int qm1d1c0042_sleep(struct dvb_frontend *fe)
 300 {
 301         struct qm1d1c0042_state *state;
 302         int ret;
 303
 304         state = fe->tuner_priv;
 305         state->regs[0x01] &= (~(1 << 3)) & 0xff; /* BB_Reg_disable */
 306         state->regs[0x01] |= 1 << 0;             /* STDBY */
 307         state->regs[0x05] |= 1 << 3;             /* pfd_rst STANDBY */
 308         ret = reg_write(state, 0x05, state->regs[0x05]);
 309         if (ret == 0)
 310                 ret = reg_write(state, 0x01, state->regs[0x01]);
 311         if (ret < 0)
 312                 dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
 313                         __func__, fe->dvb->num, fe->id);
 314         return ret;
 315 }
 316
 317 static int qm1d1c0042_init(struct dvb_frontend *fe)
 318 {
 319         struct qm1d1c0042_state *state;
 320         u8 val;
 321         int i, ret;
 322
 323         state = fe->tuner_priv;
 324
 325         reg_write(state, 0x01, 0x0c);
 326         reg_write(state, 0x01, 0x0c);
 327
 328         ret = reg_write(state, 0x01, 0x0c); /* soft reset on */
 329         if (ret < 0)
 330                 goto failed;
 331         usleep_range(2000, 3000);
 332
 333         ret = reg_write(state, 0x01, 0x1c); /* soft reset off */
 334         if (ret < 0)
 335                 goto failed;
 336
 337         /* check ID and choose initial registers corresponding ID */
 338         ret = reg_read(state, 0x00, &val);
 339         if (ret < 0)
 340                 goto failed;
 341         for (reg_index = 0; reg_index < QM1D1C0042_NUM_REG_ROWS;
 342              reg_index++) {
 343                 if (val == reg_initval[reg_index][0x00])
 344                         break;
 345         }
 346         if (reg_index >= QM1D1C0042_NUM_REG_ROWS)
 347                 goto failed;
 348         memcpy(state->regs, reg_initval[reg_index], QM1D1C0042_NUM_REGS);
 349         usleep_range(2000, 3000);
 350
 351         state->regs[0x0c] |= 0x40;
 352         ret = reg_write(state, 0x0c, state->regs[0x0c]);
 353         if (ret < 0)
 354                 goto failed;
 355         msleep(state->cfg.lpf_wait);
 356
 357         /* set all writable registers */
 358         for (i = 1; i <= 0x0c ; i++) {
 359                 ret = reg_write(state, i, state->regs[i]);
 360                 if (ret < 0)
 361                         goto failed;
 362         }
 363         for (i = 0x11; i < QM1D1C0042_NUM_REGS; i++) {
 364                 ret = reg_write(state, i, state->regs[i]);
 365                 if (ret < 0)
 366                         goto failed;
 367         }
 368
 369         ret = qm1d1c0042_wakeup(state);
 370         if (ret < 0)
 371                 goto failed;
 372
 373         ret = qm1d1c0042_set_srch_mode(state, state->cfg.fast_srch);
 374         if (ret < 0)
 375                 goto failed;
 376
 377         return ret;
 378
 379 failed:
 380         dev_warn(&state->i2c->dev, "(%s) failed. [adap%d-fe%d]\n",
 381                 __func__, fe->dvb->num, fe->id);
 382         return ret;
 383 }
 384
 385 /* I2C driver functions */
 386
 387 static const struct dvb_tuner_ops qm1d1c0042_ops = {
 388         .info = {
 389                 .name = "Sharp QM1D1C0042",
 390
 391                 .frequency_min_hz =  950 * MHz,
 392                 .frequency_max_hz = 2150 * MHz,
 393         },
 394
 395         .init = qm1d1c0042_init,
 396         .sleep = qm1d1c0042_sleep,
 397         .set_config = qm1d1c0042_set_config,
 398         .set_params = qm1d1c0042_set_params,
 399 };
 400
 401
 402 static int qm1d1c0042_probe(struct i2c_client *client,
 403                             const struct i2c_device_id *id)
 404 {
 405         struct qm1d1c0042_state *state;
 406         struct qm1d1c0042_config *cfg;
 407         struct dvb_frontend *fe;
 408
 409         state = kzalloc(sizeof(*state), GFP_KERNEL);
 410         if (!state)
 411                 return -ENOMEM;
 412         state->i2c = client;
 413
 414         cfg = client->dev.platform_data;
 415         fe = cfg->fe;
 416         fe->tuner_priv = state;
 417         qm1d1c0042_set_config(fe, cfg);
 418         memcpy(&fe->ops.tuner_ops, &qm1d1c0042_ops, sizeof(qm1d1c0042_ops));
 419
 420         i2c_set_clientdata(client, &state->cfg);
 421         dev_info(&client->dev, "Sharp QM1D1C0042 attached.\n");
 422         return 0;
 423 }
 424
 425 static int qm1d1c0042_remove(struct i2c_client *client)
 426 {
 427         struct qm1d1c0042_state *state;
 428
 429         state = cfg_to_state(i2c_get_clientdata(client));
 430         state->cfg.fe->tuner_priv = NULL;
 431         kfree(state);
 432         return 0;
 433 }
 434
 435
 436 static const struct i2c_device_id qm1d1c0042_id[] = {
 437         {"qm1d1c0042", 0},
 438         {}
 439 };
 440 MODULE_DEVICE_TABLE(i2c, qm1d1c0042_id);
 441
 442 static struct i2c_driver qm1d1c0042_driver = {
 443         .driver = {
 444                 .name   = "qm1d1c0042",
 445         },
 446         .probe          = qm1d1c0042_probe,
 447         .remove         = qm1d1c0042_remove,
 448         .id_table       = qm1d1c0042_id,
 449 };
 450
 451 module_i2c_driver(qm1d1c0042_driver);
 452
 453 MODULE_DESCRIPTION("Sharp QM1D1C0042 tuner");
 454 MODULE_AUTHOR("Akihiro TSUKADA");
 455 MODULE_LICENSE("GPL");