linux/drivers/media/dvb-frontends/atbm8830.c
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   1/*
   2 *    Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
   3 *    ATBM8830, ATBM8831
   4 *
   5 *    Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com>
   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 <asm/div64.h>
  19#include "dvb_frontend.h"
  20
  21#include "atbm8830.h"
  22#include "atbm8830_priv.h"
  23
  24#define dprintk(args...) \
  25        do { \
  26                if (debug) \
  27                        printk(KERN_DEBUG "atbm8830: " args); \
  28        } while (0)
  29
  30static int debug;
  31
  32module_param(debug, int, 0644);
  33MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  34
  35static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
  36{
  37        int ret = 0;
  38        u8 dev_addr;
  39        u8 buf1[] = { reg >> 8, reg & 0xFF };
  40        u8 buf2[] = { data };
  41        struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
  42        struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
  43
  44        dev_addr = priv->config->demod_address;
  45        msg1.addr = dev_addr;
  46        msg2.addr = dev_addr;
  47
  48        if (debug >= 2)
  49                dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);
  50
  51        ret = i2c_transfer(priv->i2c, &msg1, 1);
  52        if (ret != 1)
  53                return -EIO;
  54
  55        ret = i2c_transfer(priv->i2c, &msg2, 1);
  56        return (ret != 1) ? -EIO : 0;
  57}
  58
  59static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
  60{
  61        int ret;
  62        u8 dev_addr;
  63
  64        u8 buf1[] = { reg >> 8, reg & 0xFF };
  65        u8 buf2[] = { 0 };
  66        struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
  67        struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
  68
  69        dev_addr = priv->config->demod_address;
  70        msg1.addr = dev_addr;
  71        msg2.addr = dev_addr;
  72
  73        ret = i2c_transfer(priv->i2c, &msg1, 1);
  74        if (ret != 1) {
  75                dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
  76                return -EIO;
  77        }
  78
  79        ret = i2c_transfer(priv->i2c, &msg2, 1);
  80        if (ret != 1)
  81                return -EIO;
  82
  83        *p_data = buf2[0];
  84        if (debug >= 2)
  85                dprintk("%s: reg=0x%04X, data=0x%02X\n",
  86                        __func__, reg, buf2[0]);
  87
  88        return 0;
  89}
  90
  91/* Lock register latch so that multi-register read is atomic */
  92static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
  93{
  94        return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
  95}
  96
  97static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
  98{
  99        u32 val;
 100        u64 t;
 101
 102        /* 0x100000 * freq / 30.4MHz */
 103        t = (u64)0x100000 * freq;
 104        do_div(t, 30400);
 105        val = t;
 106
 107        atbm8830_write_reg(priv, REG_OSC_CLK, val);
 108        atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
 109        atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
 110
 111        return 0;
 112}
 113
 114static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
 115{
 116
 117        u32 fs = priv->config->osc_clk_freq;
 118        u64 t;
 119        u32 val;
 120        u8 dat;
 121
 122        if (freq != 0) {
 123                /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
 124                t = (u64) 2 * 31416 * (freq - fs);
 125                t <<= 22;
 126                do_div(t, fs);
 127                do_div(t, 1000);
 128                val = t;
 129
 130                atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
 131                atbm8830_write_reg(priv, REG_IF_FREQ, val);
 132                atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
 133                atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
 134
 135                atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
 136                dat &= 0xFC;
 137                atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
 138        } else {
 139                /* Zero IF */
 140                atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
 141
 142                atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
 143                dat &= 0xFC;
 144                dat |= 0x02;
 145                atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
 146
 147                if (priv->config->zif_swap_iq)
 148                        atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
 149                else
 150                        atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
 151        }
 152
 153        return 0;
 154}
 155
 156static int is_locked(struct atbm_state *priv, u8 *locked)
 157{
 158        u8 status;
 159
 160        atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
 161
 162        if (locked != NULL)
 163                *locked = (status == 1);
 164        return 0;
 165}
 166
 167static int set_agc_config(struct atbm_state *priv,
 168        u8 min, u8 max, u8 hold_loop)
 169{
 170        /* no effect if both min and max are zero */
 171        if (!min && !max)
 172            return 0;
 173
 174        atbm8830_write_reg(priv, REG_AGC_MIN, min);
 175        atbm8830_write_reg(priv, REG_AGC_MAX, max);
 176        atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
 177
 178        return 0;
 179}
 180
 181static int set_static_channel_mode(struct atbm_state *priv)
 182{
 183        int i;
 184
 185        for (i = 0; i < 5; i++)
 186                atbm8830_write_reg(priv, 0x099B + i, 0x08);
 187
 188        atbm8830_write_reg(priv, 0x095B, 0x7F);
 189        atbm8830_write_reg(priv, 0x09CB, 0x01);
 190        atbm8830_write_reg(priv, 0x09CC, 0x7F);
 191        atbm8830_write_reg(priv, 0x09CD, 0x7F);
 192        atbm8830_write_reg(priv, 0x0E01, 0x20);
 193
 194        /* For single carrier */
 195        atbm8830_write_reg(priv, 0x0B03, 0x0A);
 196        atbm8830_write_reg(priv, 0x0935, 0x10);
 197        atbm8830_write_reg(priv, 0x0936, 0x08);
 198        atbm8830_write_reg(priv, 0x093E, 0x08);
 199        atbm8830_write_reg(priv, 0x096E, 0x06);
 200
 201        /* frame_count_max0 */
 202        atbm8830_write_reg(priv, 0x0B09, 0x00);
 203        /* frame_count_max1 */
 204        atbm8830_write_reg(priv, 0x0B0A, 0x08);
 205
 206        return 0;
 207}
 208
 209static int set_ts_config(struct atbm_state *priv)
 210{
 211        const struct atbm8830_config *cfg = priv->config;
 212
 213        /*Set parallel/serial ts mode*/
 214        atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
 215        atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
 216        /*Set ts sampling edge*/
 217        atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
 218                cfg->ts_sampling_edge ? 1 : 0);
 219        /*Set ts clock freerun*/
 220        atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
 221                cfg->ts_clk_gated ? 0 : 1);
 222
 223        return 0;
 224}
 225
 226static int atbm8830_init(struct dvb_frontend *fe)
 227{
 228        struct atbm_state *priv = fe->demodulator_priv;
 229        const struct atbm8830_config *cfg = priv->config;
 230
 231        /*Set oscillator frequency*/
 232        set_osc_freq(priv, cfg->osc_clk_freq);
 233
 234        /*Set IF frequency*/
 235        set_if_freq(priv, cfg->if_freq);
 236
 237        /*Set AGC Config*/
 238        set_agc_config(priv, cfg->agc_min, cfg->agc_max,
 239                cfg->agc_hold_loop);
 240
 241        /*Set static channel mode*/
 242        set_static_channel_mode(priv);
 243
 244        set_ts_config(priv);
 245        /*Turn off DSP reset*/
 246        atbm8830_write_reg(priv, 0x000A, 0);
 247
 248        /*SW version test*/
 249        atbm8830_write_reg(priv, 0x020C, 11);
 250
 251        /* Run */
 252        atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
 253
 254        return 0;
 255}
 256
 257
 258static void atbm8830_release(struct dvb_frontend *fe)
 259{
 260        struct atbm_state *state = fe->demodulator_priv;
 261        dprintk("%s\n", __func__);
 262
 263        kfree(state);
 264}
 265
 266static int atbm8830_set_fe(struct dvb_frontend *fe)
 267{
 268        struct atbm_state *priv = fe->demodulator_priv;
 269        int i;
 270        u8 locked = 0;
 271        dprintk("%s\n", __func__);
 272
 273        /* set frequency */
 274        if (fe->ops.tuner_ops.set_params) {
 275                if (fe->ops.i2c_gate_ctrl)
 276                        fe->ops.i2c_gate_ctrl(fe, 1);
 277                fe->ops.tuner_ops.set_params(fe);
 278                if (fe->ops.i2c_gate_ctrl)
 279                        fe->ops.i2c_gate_ctrl(fe, 0);
 280        }
 281
 282        /* start auto lock */
 283        for (i = 0; i < 10; i++) {
 284                mdelay(100);
 285                dprintk("Try %d\n", i);
 286                is_locked(priv, &locked);
 287                if (locked != 0) {
 288                        dprintk("ATBM8830 locked!\n");
 289                        break;
 290                }
 291        }
 292
 293        return 0;
 294}
 295
 296static int atbm8830_get_fe(struct dvb_frontend *fe,
 297                           struct dtv_frontend_properties *c)
 298{
 299        dprintk("%s\n", __func__);
 300
 301        /* TODO: get real readings from device */
 302        /* inversion status */
 303        c->inversion = INVERSION_OFF;
 304
 305        /* bandwidth */
 306        c->bandwidth_hz = 8000000;
 307
 308        c->code_rate_HP = FEC_AUTO;
 309        c->code_rate_LP = FEC_AUTO;
 310
 311        c->modulation = QAM_AUTO;
 312
 313        /* transmission mode */
 314        c->transmission_mode = TRANSMISSION_MODE_AUTO;
 315
 316        /* guard interval */
 317        c->guard_interval = GUARD_INTERVAL_AUTO;
 318
 319        /* hierarchy */
 320        c->hierarchy = HIERARCHY_NONE;
 321
 322        return 0;
 323}
 324
 325static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
 326        struct dvb_frontend_tune_settings *fesettings)
 327{
 328        fesettings->min_delay_ms = 0;
 329        fesettings->step_size = 0;
 330        fesettings->max_drift = 0;
 331        return 0;
 332}
 333
 334static int atbm8830_read_status(struct dvb_frontend *fe,
 335                                enum fe_status *fe_status)
 336{
 337        struct atbm_state *priv = fe->demodulator_priv;
 338        u8 locked = 0;
 339        u8 agc_locked = 0;
 340
 341        dprintk("%s\n", __func__);
 342        *fe_status = 0;
 343
 344        is_locked(priv, &locked);
 345        if (locked) {
 346                *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 347                        FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 348        }
 349        dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
 350
 351        atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
 352        dprintk("AGC Lock: %d\n", agc_locked);
 353
 354        return 0;
 355}
 356
 357static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
 358{
 359        struct atbm_state *priv = fe->demodulator_priv;
 360        u32 frame_err;
 361        u8 t;
 362
 363        dprintk("%s\n", __func__);
 364
 365        atbm8830_reglatch_lock(priv, 1);
 366
 367        atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
 368        frame_err = t & 0x7F;
 369        frame_err <<= 8;
 370        atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
 371        frame_err |= t;
 372
 373        atbm8830_reglatch_lock(priv, 0);
 374
 375        *ber = frame_err * 100 / 32767;
 376
 377        dprintk("%s: ber=0x%x\n", __func__, *ber);
 378        return 0;
 379}
 380
 381static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
 382{
 383        struct atbm_state *priv = fe->demodulator_priv;
 384        u32 pwm;
 385        u8 t;
 386
 387        dprintk("%s\n", __func__);
 388        atbm8830_reglatch_lock(priv, 1);
 389
 390        atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
 391        pwm = t & 0x03;
 392        pwm <<= 8;
 393        atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
 394        pwm |= t;
 395
 396        atbm8830_reglatch_lock(priv, 0);
 397
 398        dprintk("AGC PWM = 0x%02X\n", pwm);
 399        pwm = 0x400 - pwm;
 400
 401        *signal = pwm * 0x10000 / 0x400;
 402
 403        return 0;
 404}
 405
 406static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
 407{
 408        dprintk("%s\n", __func__);
 409        *snr = 0;
 410        return 0;
 411}
 412
 413static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 414{
 415        dprintk("%s\n", __func__);
 416        *ucblocks = 0;
 417        return 0;
 418}
 419
 420static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 421{
 422        struct atbm_state *priv = fe->demodulator_priv;
 423
 424        return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
 425}
 426
 427static const struct dvb_frontend_ops atbm8830_ops = {
 428        .delsys = { SYS_DTMB },
 429        .info = {
 430                .name = "AltoBeam ATBM8830/8831 DMB-TH",
 431                .frequency_min = 474000000,
 432                .frequency_max = 858000000,
 433                .frequency_stepsize = 10000,
 434                .caps =
 435                        FE_CAN_FEC_AUTO |
 436                        FE_CAN_QAM_AUTO |
 437                        FE_CAN_TRANSMISSION_MODE_AUTO |
 438                        FE_CAN_GUARD_INTERVAL_AUTO
 439        },
 440
 441        .release = atbm8830_release,
 442
 443        .init = atbm8830_init,
 444        .sleep = NULL,
 445        .write = NULL,
 446        .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
 447
 448        .set_frontend = atbm8830_set_fe,
 449        .get_frontend = atbm8830_get_fe,
 450        .get_tune_settings = atbm8830_get_tune_settings,
 451
 452        .read_status = atbm8830_read_status,
 453        .read_ber = atbm8830_read_ber,
 454        .read_signal_strength = atbm8830_read_signal_strength,
 455        .read_snr = atbm8830_read_snr,
 456        .read_ucblocks = atbm8830_read_ucblocks,
 457};
 458
 459struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
 460        struct i2c_adapter *i2c)
 461{
 462        struct atbm_state *priv = NULL;
 463        u8 data = 0;
 464
 465        dprintk("%s()\n", __func__);
 466
 467        if (config == NULL || i2c == NULL)
 468                return NULL;
 469
 470        priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
 471        if (priv == NULL)
 472                goto error_out;
 473
 474        priv->config = config;
 475        priv->i2c = i2c;
 476
 477        /* check if the demod is there */
 478        if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
 479                dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
 480                        __func__, priv->config->demod_address);
 481                goto error_out;
 482        }
 483        dprintk("atbm8830 chip id: 0x%02X\n", data);
 484
 485        memcpy(&priv->frontend.ops, &atbm8830_ops,
 486               sizeof(struct dvb_frontend_ops));
 487        priv->frontend.demodulator_priv = priv;
 488
 489        atbm8830_init(&priv->frontend);
 490
 491        atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
 492
 493        return &priv->frontend;
 494
 495error_out:
 496        dprintk("%s() error_out\n", __func__);
 497        kfree(priv);
 498        return NULL;
 499
 500}
 501EXPORT_SYMBOL(atbm8830_attach);
 502
 503MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
 504MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 505MODULE_LICENSE("GPL");
 506