drivers/media/dvb-frontends/s5h1432.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Samsung s5h1432 DVB-T demodulator driver
   4  *
   5  *  Copyright (C) 2009 Bill Liu <[email protected]>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/string.h>
  12 #include <linux/slab.h>
  13 #include <linux/delay.h>
  14 #include <media/dvb_frontend.h>
  15 #include "s5h1432.h"
  16
  17 struct s5h1432_state {
  18
  19         struct i2c_adapter *i2c;
  20
  21         /* configuration settings */
  22         const struct s5h1432_config *config;
  23
  24         struct dvb_frontend frontend;
  25
  26         enum fe_modulation current_modulation;
  27         unsigned int first_tune:1;
  28
  29         u32 current_frequency;
  30         int if_freq;
  31
  32         u8 inversion;
  33 };
  34
  35 static int debug;
  36
  37 #define dprintk(arg...) do {    \
  38         if (debug)              \
  39                 printk(arg);    \
  40         } while (0)
  41
  42 static int s5h1432_writereg(struct s5h1432_state *state,
  43                             u8 addr, u8 reg, u8 data)
  44 {
  45         int ret;
  46         u8 buf[] = { reg, data };
  47
  48         struct i2c_msg msg = {.addr = addr, .flags = 0, .buf = buf, .len = 2 };
  49
  50         ret = i2c_transfer(state->i2c, &msg, 1);
  51
  52         if (ret != 1)
  53                 printk(KERN_ERR "%s: writereg error 0x%02x 0x%02x 0x%04x, ret == %i)\n",
  54                        __func__, addr, reg, data, ret);
  55
  56         return (ret != 1) ? -1 : 0;
  57 }
  58
  59 static u8 s5h1432_readreg(struct s5h1432_state *state, u8 addr, u8 reg)
  60 {
  61         int ret;
  62         u8 b0[] = { reg };
  63         u8 b1[] = { 0 };
  64
  65         struct i2c_msg msg[] = {
  66                 {.addr = addr, .flags = 0, .buf = b0, .len = 1},
  67                 {.addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 1}
  68         };
  69
  70         ret = i2c_transfer(state->i2c, msg, 2);
  71
  72         if (ret != 2)
  73                 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
  74                        __func__, ret);
  75         return b1[0];
  76 }
  77
  78 static int s5h1432_sleep(struct dvb_frontend *fe)
  79 {
  80         return 0;
  81 }
  82
  83 static int s5h1432_set_channel_bandwidth(struct dvb_frontend *fe,
  84                                          u32 bandwidth)
  85 {
  86         struct s5h1432_state *state = fe->demodulator_priv;
  87
  88         u8 reg = 0;
  89
  90         /* Register [0x2E] bit 3:2 : 8MHz = 0; 7MHz = 1; 6MHz = 2 */
  91         reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x2E);
  92         reg &= ~(0x0C);
  93         switch (bandwidth) {
  94         case 6:
  95                 reg |= 0x08;
  96                 break;
  97         case 7:
  98                 reg |= 0x04;
  99                 break;
 100         case 8:
 101                 reg |= 0x00;
 102                 break;
 103         default:
 104                 return 0;
 105         }
 106         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2E, reg);
 107         return 1;
 108 }
 109
 110 static int s5h1432_set_IF(struct dvb_frontend *fe, u32 ifFreqHz)
 111 {
 112         struct s5h1432_state *state = fe->demodulator_priv;
 113
 114         switch (ifFreqHz) {
 115         case TAIWAN_HI_IF_FREQ_44_MHZ:
 116                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
 117                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
 118                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x15);
 119                 break;
 120         case EUROPE_HI_IF_FREQ_36_MHZ:
 121                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
 122                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
 123                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x40);
 124                 break;
 125         case IF_FREQ_6_MHZ:
 126                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
 127                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
 128                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xe0);
 129                 break;
 130         case IF_FREQ_3point3_MHZ:
 131                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
 132                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
 133                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
 134                 break;
 135         case IF_FREQ_3point5_MHZ:
 136                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
 137                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
 138                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xED);
 139                 break;
 140         case IF_FREQ_4_MHZ:
 141                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0xAA);
 142                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0xAA);
 143                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEA);
 144                 break;
 145         default:
 146                 {
 147                         u32 value = 0;
 148                         value = (u32) (((48000 - (ifFreqHz / 1000)) * 512 *
 149                                         (u32) 32768) / (48 * 1000));
 150                         printk(KERN_INFO
 151                                "Default IFFreq %d :reg value = 0x%x\n",
 152                                ifFreqHz, value);
 153                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4,
 154                                          (u8) value & 0xFF);
 155                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5,
 156                                          (u8) (value >> 8) & 0xFF);
 157                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7,
 158                                          (u8) (value >> 16) & 0xFF);
 159                         break;
 160                 }
 161
 162         }
 163
 164         return 1;
 165 }
 166
 167 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 168 static int s5h1432_set_frontend(struct dvb_frontend *fe)
 169 {
 170         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 171         u32 dvb_bandwidth = 8;
 172         struct s5h1432_state *state = fe->demodulator_priv;
 173
 174         if (p->frequency == state->current_frequency) {
 175                 /*current_frequency = p->frequency; */
 176                 /*state->current_frequency = p->frequency; */
 177         } else {
 178                 fe->ops.tuner_ops.set_params(fe);
 179                 msleep(300);
 180                 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
 181                 switch (p->bandwidth_hz) {
 182                 case 6000000:
 183                         dvb_bandwidth = 6;
 184                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 185                         break;
 186                 case 7000000:
 187                         dvb_bandwidth = 7;
 188                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 189                         break;
 190                 case 8000000:
 191                         dvb_bandwidth = 8;
 192                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 193                         break;
 194                 default:
 195                         return 0;
 196                 }
 197                 /*fe->ops.tuner_ops.set_params(fe); */
 198 /*Soft Reset chip*/
 199                 msleep(30);
 200                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 201                 msleep(30);
 202                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 203
 204                 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
 205                 switch (p->bandwidth_hz) {
 206                 case 6000000:
 207                         dvb_bandwidth = 6;
 208                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 209                         break;
 210                 case 7000000:
 211                         dvb_bandwidth = 7;
 212                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 213                         break;
 214                 case 8000000:
 215                         dvb_bandwidth = 8;
 216                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 217                         break;
 218                 default:
 219                         return 0;
 220                 }
 221                 /*fe->ops.tuner_ops.set_params(fe); */
 222                 /*Soft Reset chip*/
 223                 msleep(30);
 224                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 225                 msleep(30);
 226                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 227
 228         }
 229
 230         state->current_frequency = p->frequency;
 231
 232         return 0;
 233 }
 234
 235 static int s5h1432_init(struct dvb_frontend *fe)
 236 {
 237         struct s5h1432_state *state = fe->demodulator_priv;
 238
 239         u8 reg = 0;
 240         state->current_frequency = 0;
 241         printk(KERN_INFO " s5h1432_init().\n");
 242
 243         /*Set VSB mode as default, this also does a soft reset */
 244         /*Initialize registers */
 245
 246         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x04, 0xa8);
 247         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x05, 0x01);
 248         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x07, 0x70);
 249         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x19, 0x80);
 250         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1b, 0x9D);
 251         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1c, 0x30);
 252         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1d, 0x20);
 253         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x1B);
 254         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2e, 0x40);
 255         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, 0x84);
 256         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x50, 0x5a);
 257         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x5a, 0xd3);
 258         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x68, 0x50);
 259         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xb8, 0x3c);
 260         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xc4, 0x10);
 261         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xcc, 0x9c);
 262         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xDA, 0x00);
 263         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe1, 0x94);
 264         /* s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf4, 0xa1); */
 265         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf9, 0x00);
 266
 267         /*For NXP tuner*/
 268
 269         /*Set 3.3MHz as default IF frequency */
 270         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
 271         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
 272         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
 273         /* Set reg 0x1E to get the full dynamic range */
 274         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x31);
 275
 276         /* Mode setting in demod */
 277         reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x42);
 278         reg |= 0x80;
 279         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, reg);
 280         /* Serial mode */
 281
 282         /* Soft Reset chip */
 283
 284         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 285         msleep(30);
 286         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 287
 288
 289         return 0;
 290 }
 291
 292 static int s5h1432_read_status(struct dvb_frontend *fe, enum fe_status *status)
 293 {
 294         return 0;
 295 }
 296
 297 static int s5h1432_read_signal_strength(struct dvb_frontend *fe,
 298                                         u16 *signal_strength)
 299 {
 300         return 0;
 301 }
 302
 303 static int s5h1432_read_snr(struct dvb_frontend *fe, u16 *snr)
 304 {
 305         return 0;
 306 }
 307
 308 static int s5h1432_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 309 {
 310
 311         return 0;
 312 }
 313
 314 static int s5h1432_read_ber(struct dvb_frontend *fe, u32 *ber)
 315 {
 316         return 0;
 317 }
 318
 319 static int s5h1432_get_tune_settings(struct dvb_frontend *fe,
 320                                      struct dvb_frontend_tune_settings *tune)
 321 {
 322         return 0;
 323 }
 324
 325 static void s5h1432_release(struct dvb_frontend *fe)
 326 {
 327         struct s5h1432_state *state = fe->demodulator_priv;
 328         kfree(state);
 329 }
 330
 331 static const struct dvb_frontend_ops s5h1432_ops;
 332
 333 struct dvb_frontend *s5h1432_attach(const struct s5h1432_config *config,
 334                                     struct i2c_adapter *i2c)
 335 {
 336         struct s5h1432_state *state = NULL;
 337
 338         printk(KERN_INFO " Enter s5h1432_attach(). attach success!\n");
 339         /* allocate memory for the internal state */
 340         state = kmalloc(sizeof(struct s5h1432_state), GFP_KERNEL);
 341         if (!state)
 342                 return NULL;
 343
 344         /* setup the state */
 345         state->config = config;
 346         state->i2c = i2c;
 347         state->current_modulation = QAM_16;
 348         state->inversion = state->config->inversion;
 349
 350         /* create dvb_frontend */
 351         memcpy(&state->frontend.ops, &s5h1432_ops,
 352                sizeof(struct dvb_frontend_ops));
 353
 354         state->frontend.demodulator_priv = state;
 355
 356         return &state->frontend;
 357 }
 358 EXPORT_SYMBOL_GPL(s5h1432_attach);
 359
 360 static const struct dvb_frontend_ops s5h1432_ops = {
 361         .delsys = { SYS_DVBT },
 362         .info = {
 363                  .name = "Samsung s5h1432 DVB-T Frontend",
 364                  .frequency_min_hz = 177 * MHz,
 365                  .frequency_max_hz = 858 * MHz,
 366                  .frequency_stepsize_hz = 166666,
 367                  .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 368                  FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 369                  FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 370                  FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 371                  FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER},
 372
 373         .init = s5h1432_init,
 374         .sleep = s5h1432_sleep,
 375         .set_frontend = s5h1432_set_frontend,
 376         .get_tune_settings = s5h1432_get_tune_settings,
 377         .read_status = s5h1432_read_status,
 378         .read_ber = s5h1432_read_ber,
 379         .read_signal_strength = s5h1432_read_signal_strength,
 380         .read_snr = s5h1432_read_snr,
 381         .read_ucblocks = s5h1432_read_ucblocks,
 382         .release = s5h1432_release,
 383 };
 384
 385 module_param(debug, int, 0644);
 386 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 387
 388 MODULE_DESCRIPTION("Samsung s5h1432 DVB-T Demodulator driver");
 389 MODULE_AUTHOR("Bill Liu");
 390 MODULE_LICENSE("GPL");