linux/drivers/media/tuners/msi001.c
<<
>>
Prefs
   1/*
   2 * Mirics MSi001 silicon tuner driver
   3 *
   4 * Copyright (C) 2013 Antti Palosaari <crope@iki.fi>
   5 * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
   6 *
   7 *    This program is free software; you can redistribute it and/or modify
   8 *    it under the terms of the GNU General Public License as published by
   9 *    the Free Software Foundation; either version 2 of the License, or
  10 *    (at your option) any later version.
  11 *
  12 *    This program is distributed in the hope that it will be useful,
  13 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *    GNU General Public License for more details.
  16 */
  17
  18#include <linux/module.h>
  19#include <linux/gcd.h>
  20#include <media/v4l2-device.h>
  21#include <media/v4l2-ctrls.h>
  22
  23static const struct v4l2_frequency_band bands[] = {
  24        {
  25                .type = V4L2_TUNER_RF,
  26                .index = 0,
  27                .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
  28                .rangelow   =   49000000,
  29                .rangehigh  =  263000000,
  30        }, {
  31                .type = V4L2_TUNER_RF,
  32                .index = 1,
  33                .capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
  34                .rangelow   =  390000000,
  35                .rangehigh  =  960000000,
  36        },
  37};
  38
  39struct msi001_dev {
  40        struct spi_device *spi;
  41        struct v4l2_subdev sd;
  42
  43        /* Controls */
  44        struct v4l2_ctrl_handler hdl;
  45        struct v4l2_ctrl *bandwidth_auto;
  46        struct v4l2_ctrl *bandwidth;
  47        struct v4l2_ctrl *lna_gain;
  48        struct v4l2_ctrl *mixer_gain;
  49        struct v4l2_ctrl *if_gain;
  50
  51        unsigned int f_tuner;
  52};
  53
  54static inline struct msi001_dev *sd_to_msi001_dev(struct v4l2_subdev *sd)
  55{
  56        return container_of(sd, struct msi001_dev, sd);
  57}
  58
  59static int msi001_wreg(struct msi001_dev *dev, u32 data)
  60{
  61        /* Register format: 4 bits addr + 20 bits value */
  62        return spi_write(dev->spi, &data, 3);
  63};
  64
  65static int msi001_set_gain(struct msi001_dev *dev, int lna_gain, int mixer_gain,
  66                           int if_gain)
  67{
  68        struct spi_device *spi = dev->spi;
  69        int ret;
  70        u32 reg;
  71
  72        dev_dbg(&spi->dev, "lna=%d mixer=%d if=%d\n",
  73                lna_gain, mixer_gain, if_gain);
  74
  75        reg = 1 << 0;
  76        reg |= (59 - if_gain) << 4;
  77        reg |= 0 << 10;
  78        reg |= (1 - mixer_gain) << 12;
  79        reg |= (1 - lna_gain) << 13;
  80        reg |= 4 << 14;
  81        reg |= 0 << 17;
  82        ret = msi001_wreg(dev, reg);
  83        if (ret)
  84                goto err;
  85
  86        return 0;
  87err:
  88        dev_dbg(&spi->dev, "failed %d\n", ret);
  89        return ret;
  90};
  91
  92static int msi001_set_tuner(struct msi001_dev *dev)
  93{
  94        struct spi_device *spi = dev->spi;
  95        int ret, i;
  96        unsigned int uitmp, div_n, k, k_thresh, k_frac, div_lo, f_if1;
  97        u32 reg;
  98        u64 f_vco;
  99        u8 mode, filter_mode;
 100
 101        static const struct {
 102                u32 rf;
 103                u8 mode;
 104                u8 div_lo;
 105        } band_lut[] = {
 106                { 50000000, 0xe1, 16}, /* AM_MODE2, antenna 2 */
 107                {108000000, 0x42, 32}, /* VHF_MODE */
 108                {330000000, 0x44, 16}, /* B3_MODE */
 109                {960000000, 0x48,  4}, /* B45_MODE */
 110                {      ~0U, 0x50,  2}, /* BL_MODE */
 111        };
 112        static const struct {
 113                u32 freq;
 114                u8 filter_mode;
 115        } if_freq_lut[] = {
 116                {      0, 0x03}, /* Zero IF */
 117                { 450000, 0x02}, /* 450 kHz IF */
 118                {1620000, 0x01}, /* 1.62 MHz IF */
 119                {2048000, 0x00}, /* 2.048 MHz IF */
 120        };
 121        static const struct {
 122                u32 freq;
 123                u8 val;
 124        } bandwidth_lut[] = {
 125                { 200000, 0x00}, /* 200 kHz */
 126                { 300000, 0x01}, /* 300 kHz */
 127                { 600000, 0x02}, /* 600 kHz */
 128                {1536000, 0x03}, /* 1.536 MHz */
 129                {5000000, 0x04}, /* 5 MHz */
 130                {6000000, 0x05}, /* 6 MHz */
 131                {7000000, 0x06}, /* 7 MHz */
 132                {8000000, 0x07}, /* 8 MHz */
 133        };
 134
 135        unsigned int f_rf = dev->f_tuner;
 136
 137        /*
 138         * bandwidth (Hz)
 139         * 200000, 300000, 600000, 1536000, 5000000, 6000000, 7000000, 8000000
 140         */
 141        unsigned int bandwidth;
 142
 143        /*
 144         * intermediate frequency (Hz)
 145         * 0, 450000, 1620000, 2048000
 146         */
 147        unsigned int f_if = 0;
 148        #define F_REF 24000000
 149        #define DIV_PRE_N 4
 150        #define F_VCO_STEP div_lo
 151
 152        dev_dbg(&spi->dev, "f_rf=%d f_if=%d\n", f_rf, f_if);
 153
 154        for (i = 0; i < ARRAY_SIZE(band_lut); i++) {
 155                if (f_rf <= band_lut[i].rf) {
 156                        mode = band_lut[i].mode;
 157                        div_lo = band_lut[i].div_lo;
 158                        break;
 159                }
 160        }
 161        if (i == ARRAY_SIZE(band_lut)) {
 162                ret = -EINVAL;
 163                goto err;
 164        }
 165
 166        /* AM_MODE is upconverted */
 167        if ((mode >> 0) & 0x1)
 168                f_if1 =  5 * F_REF;
 169        else
 170                f_if1 =  0;
 171
 172        for (i = 0; i < ARRAY_SIZE(if_freq_lut); i++) {
 173                if (f_if == if_freq_lut[i].freq) {
 174                        filter_mode = if_freq_lut[i].filter_mode;
 175                        break;
 176                }
 177        }
 178        if (i == ARRAY_SIZE(if_freq_lut)) {
 179                ret = -EINVAL;
 180                goto err;
 181        }
 182
 183        /* filters */
 184        bandwidth = dev->bandwidth->val;
 185        bandwidth = clamp(bandwidth, 200000U, 8000000U);
 186
 187        for (i = 0; i < ARRAY_SIZE(bandwidth_lut); i++) {
 188                if (bandwidth <= bandwidth_lut[i].freq) {
 189                        bandwidth = bandwidth_lut[i].val;
 190                        break;
 191                }
 192        }
 193        if (i == ARRAY_SIZE(bandwidth_lut)) {
 194                ret = -EINVAL;
 195                goto err;
 196        }
 197
 198        dev->bandwidth->val = bandwidth_lut[i].freq;
 199
 200        dev_dbg(&spi->dev, "bandwidth selected=%d\n", bandwidth_lut[i].freq);
 201
 202        /*
 203         * Fractional-N synthesizer
 204         *
 205         *           +---------------------------------------+
 206         *           v                                       |
 207         *  Fref   +----+     +-------+         +----+     +------+     +---+
 208         * ------> | PD | --> |  VCO  | ------> | /4 | --> | /N.F | <-- | K |
 209         *         +----+     +-------+         +----+     +------+     +---+
 210         *                      |
 211         *                      |
 212         *                      v
 213         *                    +-------+  Fout
 214         *                    | /Rout | ------>
 215         *                    +-------+
 216         */
 217
 218        /* Calculate PLL integer and fractional control word. */
 219        f_vco = (u64) (f_rf + f_if + f_if1) * div_lo;
 220        div_n = div_u64_rem(f_vco, DIV_PRE_N * F_REF, &k);
 221        k_thresh = (DIV_PRE_N * F_REF) / F_VCO_STEP;
 222        k_frac = div_u64((u64) k * k_thresh, (DIV_PRE_N * F_REF));
 223
 224        /* Find out greatest common divisor and divide to smaller. */
 225        uitmp = gcd(k_thresh, k_frac);
 226        k_thresh /= uitmp;
 227        k_frac /= uitmp;
 228
 229        /* Force divide to reg max. Resolution will be reduced. */
 230        uitmp = DIV_ROUND_UP(k_thresh, 4095);
 231        k_thresh = DIV_ROUND_CLOSEST(k_thresh, uitmp);
 232        k_frac = DIV_ROUND_CLOSEST(k_frac, uitmp);
 233
 234        /* Calculate real RF set. */
 235        uitmp = (unsigned int) F_REF * DIV_PRE_N * div_n;
 236        uitmp += (unsigned int) F_REF * DIV_PRE_N * k_frac / k_thresh;
 237        uitmp /= div_lo;
 238
 239        dev_dbg(&spi->dev,
 240                "f_rf=%u:%u f_vco=%llu div_n=%u k_thresh=%u k_frac=%u div_lo=%u\n",
 241                f_rf, uitmp, f_vco, div_n, k_thresh, k_frac, div_lo);
 242
 243        ret = msi001_wreg(dev, 0x00000e);
 244        if (ret)
 245                goto err;
 246
 247        ret = msi001_wreg(dev, 0x000003);
 248        if (ret)
 249                goto err;
 250
 251        reg = 0 << 0;
 252        reg |= mode << 4;
 253        reg |= filter_mode << 12;
 254        reg |= bandwidth << 14;
 255        reg |= 0x02 << 17;
 256        reg |= 0x00 << 20;
 257        ret = msi001_wreg(dev, reg);
 258        if (ret)
 259                goto err;
 260
 261        reg = 5 << 0;
 262        reg |= k_thresh << 4;
 263        reg |= 1 << 19;
 264        reg |= 1 << 21;
 265        ret = msi001_wreg(dev, reg);
 266        if (ret)
 267                goto err;
 268
 269        reg = 2 << 0;
 270        reg |= k_frac << 4;
 271        reg |= div_n << 16;
 272        ret = msi001_wreg(dev, reg);
 273        if (ret)
 274                goto err;
 275
 276        ret = msi001_set_gain(dev, dev->lna_gain->cur.val,
 277                              dev->mixer_gain->cur.val, dev->if_gain->cur.val);
 278        if (ret)
 279                goto err;
 280
 281        reg = 6 << 0;
 282        reg |= 63 << 4;
 283        reg |= 4095 << 10;
 284        ret = msi001_wreg(dev, reg);
 285        if (ret)
 286                goto err;
 287
 288        return 0;
 289err:
 290        dev_dbg(&spi->dev, "failed %d\n", ret);
 291        return ret;
 292}
 293
 294static int msi001_s_power(struct v4l2_subdev *sd, int on)
 295{
 296        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 297        struct spi_device *spi = dev->spi;
 298        int ret;
 299
 300        dev_dbg(&spi->dev, "on=%d\n", on);
 301
 302        if (on)
 303                ret = 0;
 304        else
 305                ret = msi001_wreg(dev, 0x000000);
 306
 307        return ret;
 308}
 309
 310static const struct v4l2_subdev_core_ops msi001_core_ops = {
 311        .s_power                  = msi001_s_power,
 312};
 313
 314static int msi001_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
 315{
 316        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 317        struct spi_device *spi = dev->spi;
 318
 319        dev_dbg(&spi->dev, "index=%d\n", v->index);
 320
 321        strlcpy(v->name, "Mirics MSi001", sizeof(v->name));
 322        v->type = V4L2_TUNER_RF;
 323        v->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
 324        v->rangelow =    49000000;
 325        v->rangehigh =  960000000;
 326
 327        return 0;
 328}
 329
 330static int msi001_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
 331{
 332        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 333        struct spi_device *spi = dev->spi;
 334
 335        dev_dbg(&spi->dev, "index=%d\n", v->index);
 336        return 0;
 337}
 338
 339static int msi001_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
 340{
 341        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 342        struct spi_device *spi = dev->spi;
 343
 344        dev_dbg(&spi->dev, "tuner=%d\n", f->tuner);
 345        f->frequency = dev->f_tuner;
 346        return 0;
 347}
 348
 349static int msi001_s_frequency(struct v4l2_subdev *sd,
 350                              const struct v4l2_frequency *f)
 351{
 352        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 353        struct spi_device *spi = dev->spi;
 354        unsigned int band;
 355
 356        dev_dbg(&spi->dev, "tuner=%d type=%d frequency=%u\n",
 357                f->tuner, f->type, f->frequency);
 358
 359        if (f->frequency < ((bands[0].rangehigh + bands[1].rangelow) / 2))
 360                band = 0;
 361        else
 362                band = 1;
 363        dev->f_tuner = clamp_t(unsigned int, f->frequency,
 364                               bands[band].rangelow, bands[band].rangehigh);
 365
 366        return msi001_set_tuner(dev);
 367}
 368
 369static int msi001_enum_freq_bands(struct v4l2_subdev *sd,
 370                                  struct v4l2_frequency_band *band)
 371{
 372        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 373        struct spi_device *spi = dev->spi;
 374
 375        dev_dbg(&spi->dev, "tuner=%d type=%d index=%d\n",
 376                band->tuner, band->type, band->index);
 377
 378        if (band->index >= ARRAY_SIZE(bands))
 379                return -EINVAL;
 380
 381        band->capability = bands[band->index].capability;
 382        band->rangelow = bands[band->index].rangelow;
 383        band->rangehigh = bands[band->index].rangehigh;
 384
 385        return 0;
 386}
 387
 388static const struct v4l2_subdev_tuner_ops msi001_tuner_ops = {
 389        .g_tuner                  = msi001_g_tuner,
 390        .s_tuner                  = msi001_s_tuner,
 391        .g_frequency              = msi001_g_frequency,
 392        .s_frequency              = msi001_s_frequency,
 393        .enum_freq_bands          = msi001_enum_freq_bands,
 394};
 395
 396static const struct v4l2_subdev_ops msi001_ops = {
 397        .core                     = &msi001_core_ops,
 398        .tuner                    = &msi001_tuner_ops,
 399};
 400
 401static int msi001_s_ctrl(struct v4l2_ctrl *ctrl)
 402{
 403        struct msi001_dev *dev = container_of(ctrl->handler, struct msi001_dev, hdl);
 404        struct spi_device *spi = dev->spi;
 405
 406        int ret;
 407
 408        dev_dbg(&spi->dev, "id=%d name=%s val=%d min=%lld max=%lld step=%lld\n",
 409                ctrl->id, ctrl->name, ctrl->val, ctrl->minimum, ctrl->maximum,
 410                ctrl->step);
 411
 412        switch (ctrl->id) {
 413        case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
 414        case V4L2_CID_RF_TUNER_BANDWIDTH:
 415                ret = msi001_set_tuner(dev);
 416                break;
 417        case  V4L2_CID_RF_TUNER_LNA_GAIN:
 418                ret = msi001_set_gain(dev, dev->lna_gain->val,
 419                                      dev->mixer_gain->cur.val,
 420                                      dev->if_gain->cur.val);
 421                break;
 422        case  V4L2_CID_RF_TUNER_MIXER_GAIN:
 423                ret = msi001_set_gain(dev, dev->lna_gain->cur.val,
 424                                      dev->mixer_gain->val,
 425                                      dev->if_gain->cur.val);
 426                break;
 427        case  V4L2_CID_RF_TUNER_IF_GAIN:
 428                ret = msi001_set_gain(dev, dev->lna_gain->cur.val,
 429                                      dev->mixer_gain->cur.val,
 430                                      dev->if_gain->val);
 431                break;
 432        default:
 433                dev_dbg(&spi->dev, "unknown control %d\n", ctrl->id);
 434                ret = -EINVAL;
 435        }
 436
 437        return ret;
 438}
 439
 440static const struct v4l2_ctrl_ops msi001_ctrl_ops = {
 441        .s_ctrl                   = msi001_s_ctrl,
 442};
 443
 444static int msi001_probe(struct spi_device *spi)
 445{
 446        struct msi001_dev *dev;
 447        int ret;
 448
 449        dev_dbg(&spi->dev, "\n");
 450
 451        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 452        if (!dev) {
 453                ret = -ENOMEM;
 454                goto err;
 455        }
 456
 457        dev->spi = spi;
 458        dev->f_tuner = bands[0].rangelow;
 459        v4l2_spi_subdev_init(&dev->sd, spi, &msi001_ops);
 460
 461        /* Register controls */
 462        v4l2_ctrl_handler_init(&dev->hdl, 5);
 463        dev->bandwidth_auto = v4l2_ctrl_new_std(&dev->hdl, &msi001_ctrl_ops,
 464                        V4L2_CID_RF_TUNER_BANDWIDTH_AUTO, 0, 1, 1, 1);
 465        dev->bandwidth = v4l2_ctrl_new_std(&dev->hdl, &msi001_ctrl_ops,
 466                        V4L2_CID_RF_TUNER_BANDWIDTH, 200000, 8000000, 1, 200000);
 467        v4l2_ctrl_auto_cluster(2, &dev->bandwidth_auto, 0, false);
 468        dev->lna_gain = v4l2_ctrl_new_std(&dev->hdl, &msi001_ctrl_ops,
 469                        V4L2_CID_RF_TUNER_LNA_GAIN, 0, 1, 1, 1);
 470        dev->mixer_gain = v4l2_ctrl_new_std(&dev->hdl, &msi001_ctrl_ops,
 471                        V4L2_CID_RF_TUNER_MIXER_GAIN, 0, 1, 1, 1);
 472        dev->if_gain = v4l2_ctrl_new_std(&dev->hdl, &msi001_ctrl_ops,
 473                        V4L2_CID_RF_TUNER_IF_GAIN, 0, 59, 1, 0);
 474        if (dev->hdl.error) {
 475                ret = dev->hdl.error;
 476                dev_err(&spi->dev, "Could not initialize controls\n");
 477                /* control init failed, free handler */
 478                goto err_ctrl_handler_free;
 479        }
 480
 481        dev->sd.ctrl_handler = &dev->hdl;
 482        return 0;
 483err_ctrl_handler_free:
 484        v4l2_ctrl_handler_free(&dev->hdl);
 485        kfree(dev);
 486err:
 487        return ret;
 488}
 489
 490static int msi001_remove(struct spi_device *spi)
 491{
 492        struct v4l2_subdev *sd = spi_get_drvdata(spi);
 493        struct msi001_dev *dev = sd_to_msi001_dev(sd);
 494
 495        dev_dbg(&spi->dev, "\n");
 496
 497        /*
 498         * Registered by v4l2_spi_new_subdev() from master driver, but we must
 499         * unregister it from here. Weird.
 500         */
 501        v4l2_device_unregister_subdev(&dev->sd);
 502        v4l2_ctrl_handler_free(&dev->hdl);
 503        kfree(dev);
 504        return 0;
 505}
 506
 507static const struct spi_device_id msi001_id_table[] = {
 508        {"msi001", 0},
 509        {}
 510};
 511MODULE_DEVICE_TABLE(spi, msi001_id_table);
 512
 513static struct spi_driver msi001_driver = {
 514        .driver = {
 515                .name   = "msi001",
 516                .suppress_bind_attrs = true,
 517        },
 518        .probe          = msi001_probe,
 519        .remove         = msi001_remove,
 520        .id_table       = msi001_id_table,
 521};
 522module_spi_driver(msi001_driver);
 523
 524MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 525MODULE_DESCRIPTION("Mirics MSi001");
 526MODULE_LICENSE("GPL");
 527