drivers/media/dvb-frontends/atbm8830.c

   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 <media/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
  30 static int debug;
  31
  32 module_param(debug, int, 0644);
  33 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  34
  35 static 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
  59 static 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 */
  92 static 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
  97 static 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
 114 static 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
 156 static 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
 167 static 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
 181 static 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
 209 static 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
 226 static 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
 258 static 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
 266 static 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
 296 static 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
 325 static 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
 334 static 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
 357 static 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
 381 static 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
 406 static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
 407 {
 408         dprintk("%s\n", __func__);
 409         *snr = 0;
 410         return 0;
 411 }
 412
 413 static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 414 {
 415         dprintk("%s\n", __func__);
 416         *ucblocks = 0;
 417         return 0;
 418 }
 419
 420 static 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
 427 static 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
 459 struct 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
 495 error_out:
 496         dprintk("%s() error_out\n", __func__);
 497         kfree(priv);
 498         return NULL;
 499
 500 }
 501 EXPORT_SYMBOL(atbm8830_attach);
 502
 503 MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
 504 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 505 MODULE_LICENSE("GPL");