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  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <asm/div64.h>
  23 #include "dvb_frontend.h"
  24
  25 #include "atbm8830.h"
  26 #include "atbm8830_priv.h"
  27
  28 #define dprintk(args...) \
  29         do { \
  30                 if (debug) \
  31                         printk(KERN_DEBUG "atbm8830: " args); \
  32         } while (0)
  33
  34 static int debug;
  35
  36 module_param(debug, int, 0644);
  37 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  38
  39 static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
  40 {
  41         int ret = 0;
  42         u8 dev_addr;
  43         u8 buf1[] = { reg >> 8, reg & 0xFF };
  44         u8 buf2[] = { data };
  45         struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
  46         struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
  47
  48         dev_addr = priv->config->demod_address;
  49         msg1.addr = dev_addr;
  50         msg2.addr = dev_addr;
  51
  52         if (debug >= 2)
  53                 dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);
  54
  55         ret = i2c_transfer(priv->i2c, &msg1, 1);
  56         if (ret != 1)
  57                 return -EIO;
  58
  59         ret = i2c_transfer(priv->i2c, &msg2, 1);
  60         return (ret != 1) ? -EIO : 0;
  61 }
  62
  63 static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
  64 {
  65         int ret;
  66         u8 dev_addr;
  67
  68         u8 buf1[] = { reg >> 8, reg & 0xFF };
  69         u8 buf2[] = { 0 };
  70         struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
  71         struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
  72
  73         dev_addr = priv->config->demod_address;
  74         msg1.addr = dev_addr;
  75         msg2.addr = dev_addr;
  76
  77         ret = i2c_transfer(priv->i2c, &msg1, 1);
  78         if (ret != 1) {
  79                 dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
  80                 return -EIO;
  81         }
  82
  83         ret = i2c_transfer(priv->i2c, &msg2, 1);
  84         if (ret != 1)
  85                 return -EIO;
  86
  87         *p_data = buf2[0];
  88         if (debug >= 2)
  89                 dprintk("%s: reg=0x%04X, data=0x%02X\n",
  90                         __func__, reg, buf2[0]);
  91
  92         return 0;
  93 }
  94
  95 /* Lock register latch so that multi-register read is atomic */
  96 static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
  97 {
  98         return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
  99 }
 100
 101 static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
 102 {
 103         u32 val;
 104         u64 t;
 105
 106         /* 0x100000 * freq / 30.4MHz */
 107         t = (u64)0x100000 * freq;
 108         do_div(t, 30400);
 109         val = t;
 110
 111         atbm8830_write_reg(priv, REG_OSC_CLK, val);
 112         atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
 113         atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
 114
 115         return 0;
 116 }
 117
 118 static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
 119 {
 120
 121         u32 fs = priv->config->osc_clk_freq;
 122         u64 t;
 123         u32 val;
 124         u8 dat;
 125
 126         if (freq != 0) {
 127                 /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
 128                 t = (u64) 2 * 31416 * (freq - fs);
 129                 t <<= 22;
 130                 do_div(t, fs);
 131                 do_div(t, 1000);
 132                 val = t;
 133
 134                 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
 135                 atbm8830_write_reg(priv, REG_IF_FREQ, val);
 136                 atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
 137                 atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
 138
 139                 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
 140                 dat &= 0xFC;
 141                 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
 142         } else {
 143                 /* Zero IF */
 144                 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
 145
 146                 atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
 147                 dat &= 0xFC;
 148                 dat |= 0x02;
 149                 atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
 150
 151                 if (priv->config->zif_swap_iq)
 152                         atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
 153                 else
 154                         atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int is_locked(struct atbm_state *priv, u8 *locked)
 161 {
 162         u8 status;
 163
 164         atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
 165
 166         if (locked != NULL)
 167                 *locked = (status == 1);
 168         return 0;
 169 }
 170
 171 static int set_agc_config(struct atbm_state *priv,
 172         u8 min, u8 max, u8 hold_loop)
 173 {
 174         /* no effect if both min and max are zero */
 175         if (!min && !max)
 176             return 0;
 177
 178         atbm8830_write_reg(priv, REG_AGC_MIN, min);
 179         atbm8830_write_reg(priv, REG_AGC_MAX, max);
 180         atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
 181
 182         return 0;
 183 }
 184
 185 static int set_static_channel_mode(struct atbm_state *priv)
 186 {
 187         int i;
 188
 189         for (i = 0; i < 5; i++)
 190                 atbm8830_write_reg(priv, 0x099B + i, 0x08);
 191
 192         atbm8830_write_reg(priv, 0x095B, 0x7F);
 193         atbm8830_write_reg(priv, 0x09CB, 0x01);
 194         atbm8830_write_reg(priv, 0x09CC, 0x7F);
 195         atbm8830_write_reg(priv, 0x09CD, 0x7F);
 196         atbm8830_write_reg(priv, 0x0E01, 0x20);
 197
 198         /* For single carrier */
 199         atbm8830_write_reg(priv, 0x0B03, 0x0A);
 200         atbm8830_write_reg(priv, 0x0935, 0x10);
 201         atbm8830_write_reg(priv, 0x0936, 0x08);
 202         atbm8830_write_reg(priv, 0x093E, 0x08);
 203         atbm8830_write_reg(priv, 0x096E, 0x06);
 204
 205         /* frame_count_max0 */
 206         atbm8830_write_reg(priv, 0x0B09, 0x00);
 207         /* frame_count_max1 */
 208         atbm8830_write_reg(priv, 0x0B0A, 0x08);
 209
 210         return 0;
 211 }
 212
 213 static int set_ts_config(struct atbm_state *priv)
 214 {
 215         const struct atbm8830_config *cfg = priv->config;
 216
 217         /*Set parallel/serial ts mode*/
 218         atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
 219         atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
 220         /*Set ts sampling edge*/
 221         atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
 222                 cfg->ts_sampling_edge ? 1 : 0);
 223         /*Set ts clock freerun*/
 224         atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
 225                 cfg->ts_clk_gated ? 0 : 1);
 226
 227         return 0;
 228 }
 229
 230 static int atbm8830_init(struct dvb_frontend *fe)
 231 {
 232         struct atbm_state *priv = fe->demodulator_priv;
 233         const struct atbm8830_config *cfg = priv->config;
 234
 235         /*Set oscillator frequency*/
 236         set_osc_freq(priv, cfg->osc_clk_freq);
 237
 238         /*Set IF frequency*/
 239         set_if_freq(priv, cfg->if_freq);
 240
 241         /*Set AGC Config*/
 242         set_agc_config(priv, cfg->agc_min, cfg->agc_max,
 243                 cfg->agc_hold_loop);
 244
 245         /*Set static channel mode*/
 246         set_static_channel_mode(priv);
 247
 248         set_ts_config(priv);
 249         /*Turn off DSP reset*/
 250         atbm8830_write_reg(priv, 0x000A, 0);
 251
 252         /*SW version test*/
 253         atbm8830_write_reg(priv, 0x020C, 11);
 254
 255         /* Run */
 256         atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
 257
 258         return 0;
 259 }
 260
 261
 262 static void atbm8830_release(struct dvb_frontend *fe)
 263 {
 264         struct atbm_state *state = fe->demodulator_priv;
 265         dprintk("%s\n", __func__);
 266
 267         kfree(state);
 268 }
 269
 270 static int atbm8830_set_fe(struct dvb_frontend *fe,
 271                           struct dvb_frontend_parameters *fe_params)
 272 {
 273         struct atbm_state *priv = fe->demodulator_priv;
 274         int i;
 275         u8 locked = 0;
 276         dprintk("%s\n", __func__);
 277
 278         /* set frequency */
 279         if (fe->ops.tuner_ops.set_params) {
 280                 if (fe->ops.i2c_gate_ctrl)
 281                         fe->ops.i2c_gate_ctrl(fe, 1);
 282                 fe->ops.tuner_ops.set_params(fe, fe_params);
 283                 if (fe->ops.i2c_gate_ctrl)
 284                         fe->ops.i2c_gate_ctrl(fe, 0);
 285         }
 286
 287         /* start auto lock */
 288         for (i = 0; i < 10; i++) {
 289                 mdelay(100);
 290                 dprintk("Try %d\n", i);
 291                 is_locked(priv, &locked);
 292                 if (locked != 0) {
 293                         dprintk("ATBM8830 locked!\n");
 294                         break;
 295                 }
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int atbm8830_get_fe(struct dvb_frontend *fe,
 302                           struct dvb_frontend_parameters *fe_params)
 303 {
 304         dprintk("%s\n", __func__);
 305
 306         /* TODO: get real readings from device */
 307         /* inversion status */
 308         fe_params->inversion = INVERSION_OFF;
 309
 310         /* bandwidth */
 311         fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
 312
 313         fe_params->u.ofdm.code_rate_HP = FEC_AUTO;
 314         fe_params->u.ofdm.code_rate_LP = FEC_AUTO;
 315
 316         fe_params->u.ofdm.constellation = QAM_AUTO;
 317
 318         /* transmission mode */
 319         fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
 320
 321         /* guard interval */
 322         fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
 323
 324         /* hierarchy */
 325         fe_params->u.ofdm.hierarchy_information = HIERARCHY_NONE;
 326
 327         return 0;
 328 }
 329
 330 static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
 331         struct dvb_frontend_tune_settings *fesettings)
 332 {
 333         fesettings->min_delay_ms = 0;
 334         fesettings->step_size = 0;
 335         fesettings->max_drift = 0;
 336         return 0;
 337 }
 338
 339 static int atbm8830_read_status(struct dvb_frontend *fe, fe_status_t *fe_status)
 340 {
 341         struct atbm_state *priv = fe->demodulator_priv;
 342         u8 locked = 0;
 343         u8 agc_locked = 0;
 344
 345         dprintk("%s\n", __func__);
 346         *fe_status = 0;
 347
 348         is_locked(priv, &locked);
 349         if (locked) {
 350                 *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 351                         FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 352         }
 353         dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
 354
 355         atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
 356         dprintk("AGC Lock: %d\n", agc_locked);
 357
 358         return 0;
 359 }
 360
 361 static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
 362 {
 363         struct atbm_state *priv = fe->demodulator_priv;
 364         u32 frame_err;
 365         u8 t;
 366
 367         dprintk("%s\n", __func__);
 368
 369         atbm8830_reglatch_lock(priv, 1);
 370
 371         atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
 372         frame_err = t & 0x7F;
 373         frame_err <<= 8;
 374         atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
 375         frame_err |= t;
 376
 377         atbm8830_reglatch_lock(priv, 0);
 378
 379         *ber = frame_err * 100 / 32767;
 380
 381         dprintk("%s: ber=0x%x\n", __func__, *ber);
 382         return 0;
 383 }
 384
 385 static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
 386 {
 387         struct atbm_state *priv = fe->demodulator_priv;
 388         u32 pwm;
 389         u8 t;
 390
 391         dprintk("%s\n", __func__);
 392         atbm8830_reglatch_lock(priv, 1);
 393
 394         atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
 395         pwm = t & 0x03;
 396         pwm <<= 8;
 397         atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
 398         pwm |= t;
 399
 400         atbm8830_reglatch_lock(priv, 0);
 401
 402         dprintk("AGC PWM = 0x%02X\n", pwm);
 403         pwm = 0x400 - pwm;
 404
 405         *signal = pwm * 0x10000 / 0x400;
 406
 407         return 0;
 408 }
 409
 410 static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
 411 {
 412         dprintk("%s\n", __func__);
 413         *snr = 0;
 414         return 0;
 415 }
 416
 417 static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 418 {
 419         dprintk("%s\n", __func__);
 420         *ucblocks = 0;
 421         return 0;
 422 }
 423
 424 static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 425 {
 426         struct atbm_state *priv = fe->demodulator_priv;
 427
 428         return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
 429 }
 430
 431 static struct dvb_frontend_ops atbm8830_ops = {
 432         .info = {
 433                 .name = "AltoBeam ATBM8830/8831 DMB-TH",
 434                 .type = FE_OFDM,
 435                 .frequency_min = 474000000,
 436                 .frequency_max = 858000000,
 437                 .frequency_stepsize = 10000,
 438                 .caps =
 439                         FE_CAN_FEC_AUTO |
 440                         FE_CAN_QAM_AUTO |
 441                         FE_CAN_TRANSMISSION_MODE_AUTO |
 442                         FE_CAN_GUARD_INTERVAL_AUTO
 443         },
 444
 445         .release = atbm8830_release,
 446
 447         .init = atbm8830_init,
 448         .sleep = NULL,
 449         .write = NULL,
 450         .i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
 451
 452         .set_frontend = atbm8830_set_fe,
 453         .get_frontend = atbm8830_get_fe,
 454         .get_tune_settings = atbm8830_get_tune_settings,
 455
 456         .read_status = atbm8830_read_status,
 457         .read_ber = atbm8830_read_ber,
 458         .read_signal_strength = atbm8830_read_signal_strength,
 459         .read_snr = atbm8830_read_snr,
 460         .read_ucblocks = atbm8830_read_ucblocks,
 461 };
 462
 463 struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
 464         struct i2c_adapter *i2c)
 465 {
 466         struct atbm_state *priv = NULL;
 467         u8 data = 0;
 468
 469         dprintk("%s()\n", __func__);
 470
 471         if (config == NULL || i2c == NULL)
 472                 return NULL;
 473
 474         priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
 475         if (priv == NULL)
 476                 goto error_out;
 477
 478         priv->config = config;
 479         priv->i2c = i2c;
 480
 481         /* check if the demod is there */
 482         if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
 483                 dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
 484                         __func__, priv->config->demod_address);
 485                 goto error_out;
 486         }
 487         dprintk("atbm8830 chip id: 0x%02X\n", data);
 488
 489         memcpy(&priv->frontend.ops, &atbm8830_ops,
 490                sizeof(struct dvb_frontend_ops));
 491         priv->frontend.demodulator_priv = priv;
 492
 493         atbm8830_init(&priv->frontend);
 494
 495         atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
 496
 497         return &priv->frontend;
 498
 499 error_out:
 500         dprintk("%s() error_out\n", __func__);
 501         kfree(priv);
 502         return NULL;
 503
 504 }
 505 EXPORT_SYMBOL(atbm8830_attach);
 506
 507 MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
 508 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 509 MODULE_LICENSE("GPL");