drivers/media/dvb-frontends/s5h1432.c

   1 /*
   2  *  Samsung s5h1432 DVB-T demodulator driver
   3  *
   4  *  Copyright (C) 2009 Bill Liu <[email protected]>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/string.h>
  25 #include <linux/slab.h>
  26 #include <linux/delay.h>
  27 #include "dvb_frontend.h"
  28 #include "s5h1432.h"
  29
  30 struct s5h1432_state {
  31
  32         struct i2c_adapter *i2c;
  33
  34         /* configuration settings */
  35         const struct s5h1432_config *config;
  36
  37         struct dvb_frontend frontend;
  38
  39         enum fe_modulation current_modulation;
  40         unsigned int first_tune:1;
  41
  42         u32 current_frequency;
  43         int if_freq;
  44
  45         u8 inversion;
  46 };
  47
  48 static int debug;
  49
  50 #define dprintk(arg...) do {    \
  51         if (debug)              \
  52                 printk(arg);    \
  53         } while (0)
  54
  55 static int s5h1432_writereg(struct s5h1432_state *state,
  56                             u8 addr, u8 reg, u8 data)
  57 {
  58         int ret;
  59         u8 buf[] = { reg, data };
  60
  61         struct i2c_msg msg = {.addr = addr, .flags = 0, .buf = buf, .len = 2 };
  62
  63         ret = i2c_transfer(state->i2c, &msg, 1);
  64
  65         if (ret != 1)
  66                 printk(KERN_ERR "%s: writereg error 0x%02x 0x%02x 0x%04x, "
  67                        "ret == %i)\n", __func__, addr, reg, data, ret);
  68
  69         return (ret != 1) ? -1 : 0;
  70 }
  71
  72 static u8 s5h1432_readreg(struct s5h1432_state *state, u8 addr, u8 reg)
  73 {
  74         int ret;
  75         u8 b0[] = { reg };
  76         u8 b1[] = { 0 };
  77
  78         struct i2c_msg msg[] = {
  79                 {.addr = addr, .flags = 0, .buf = b0, .len = 1},
  80                 {.addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 1}
  81         };
  82
  83         ret = i2c_transfer(state->i2c, msg, 2);
  84
  85         if (ret != 2)
  86                 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
  87                        __func__, ret);
  88         return b1[0];
  89 }
  90
  91 static int s5h1432_sleep(struct dvb_frontend *fe)
  92 {
  93         return 0;
  94 }
  95
  96 static int s5h1432_set_channel_bandwidth(struct dvb_frontend *fe,
  97                                          u32 bandwidth)
  98 {
  99         struct s5h1432_state *state = fe->demodulator_priv;
 100
 101         u8 reg = 0;
 102
 103         /* Register [0x2E] bit 3:2 : 8MHz = 0; 7MHz = 1; 6MHz = 2 */
 104         reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x2E);
 105         reg &= ~(0x0C);
 106         switch (bandwidth) {
 107         case 6:
 108                 reg |= 0x08;
 109                 break;
 110         case 7:
 111                 reg |= 0x04;
 112                 break;
 113         case 8:
 114                 reg |= 0x00;
 115                 break;
 116         default:
 117                 return 0;
 118         }
 119         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2E, reg);
 120         return 1;
 121 }
 122
 123 static int s5h1432_set_IF(struct dvb_frontend *fe, u32 ifFreqHz)
 124 {
 125         struct s5h1432_state *state = fe->demodulator_priv;
 126
 127         switch (ifFreqHz) {
 128         case TAIWAN_HI_IF_FREQ_44_MHZ:
 129                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
 130                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
 131                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x15);
 132                 break;
 133         case EUROPE_HI_IF_FREQ_36_MHZ:
 134                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
 135                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
 136                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x40);
 137                 break;
 138         case IF_FREQ_6_MHZ:
 139                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
 140                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
 141                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xe0);
 142                 break;
 143         case IF_FREQ_3point3_MHZ:
 144                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
 145                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
 146                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
 147                 break;
 148         case IF_FREQ_3point5_MHZ:
 149                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
 150                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
 151                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xED);
 152                 break;
 153         case IF_FREQ_4_MHZ:
 154                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0xAA);
 155                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0xAA);
 156                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEA);
 157                 break;
 158         default:
 159                 {
 160                         u32 value = 0;
 161                         value = (u32) (((48000 - (ifFreqHz / 1000)) * 512 *
 162                                         (u32) 32768) / (48 * 1000));
 163                         printk(KERN_INFO
 164                                "Default IFFreq %d :reg value = 0x%x\n",
 165                                ifFreqHz, value);
 166                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4,
 167                                          (u8) value & 0xFF);
 168                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5,
 169                                          (u8) (value >> 8) & 0xFF);
 170                         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7,
 171                                          (u8) (value >> 16) & 0xFF);
 172                         break;
 173                 }
 174
 175         }
 176
 177         return 1;
 178 }
 179
 180 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 181 static int s5h1432_set_frontend(struct dvb_frontend *fe)
 182 {
 183         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 184         u32 dvb_bandwidth = 8;
 185         struct s5h1432_state *state = fe->demodulator_priv;
 186
 187         if (p->frequency == state->current_frequency) {
 188                 /*current_frequency = p->frequency; */
 189                 /*state->current_frequency = p->frequency; */
 190         } else {
 191                 fe->ops.tuner_ops.set_params(fe);
 192                 msleep(300);
 193                 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
 194                 switch (p->bandwidth_hz) {
 195                 case 6000000:
 196                         dvb_bandwidth = 6;
 197                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 198                         break;
 199                 case 7000000:
 200                         dvb_bandwidth = 7;
 201                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 202                         break;
 203                 case 8000000:
 204                         dvb_bandwidth = 8;
 205                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 206                         break;
 207                 default:
 208                         return 0;
 209                 }
 210                 /*fe->ops.tuner_ops.set_params(fe); */
 211 /*Soft Reset chip*/
 212                 msleep(30);
 213                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 214                 msleep(30);
 215                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 216
 217                 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
 218                 switch (p->bandwidth_hz) {
 219                 case 6000000:
 220                         dvb_bandwidth = 6;
 221                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 222                         break;
 223                 case 7000000:
 224                         dvb_bandwidth = 7;
 225                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 226                         break;
 227                 case 8000000:
 228                         dvb_bandwidth = 8;
 229                         s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
 230                         break;
 231                 default:
 232                         return 0;
 233                 }
 234                 /*fe->ops.tuner_ops.set_params(fe); */
 235                 /*Soft Reset chip*/
 236                 msleep(30);
 237                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 238                 msleep(30);
 239                 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 240
 241         }
 242
 243         state->current_frequency = p->frequency;
 244
 245         return 0;
 246 }
 247
 248 static int s5h1432_init(struct dvb_frontend *fe)
 249 {
 250         struct s5h1432_state *state = fe->demodulator_priv;
 251
 252         u8 reg = 0;
 253         state->current_frequency = 0;
 254         printk(KERN_INFO " s5h1432_init().\n");
 255
 256         /*Set VSB mode as default, this also does a soft reset */
 257         /*Initialize registers */
 258
 259         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x04, 0xa8);
 260         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x05, 0x01);
 261         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x07, 0x70);
 262         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x19, 0x80);
 263         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1b, 0x9D);
 264         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1c, 0x30);
 265         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1d, 0x20);
 266         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x1B);
 267         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2e, 0x40);
 268         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, 0x84);
 269         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x50, 0x5a);
 270         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x5a, 0xd3);
 271         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x68, 0x50);
 272         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xb8, 0x3c);
 273         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xc4, 0x10);
 274         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xcc, 0x9c);
 275         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xDA, 0x00);
 276         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe1, 0x94);
 277         /* s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf4, 0xa1); */
 278         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf9, 0x00);
 279
 280         /*For NXP tuner*/
 281
 282         /*Set 3.3MHz as default IF frequency */
 283         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
 284         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
 285         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
 286         /* Set reg 0x1E to get the full dynamic range */
 287         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x31);
 288
 289         /* Mode setting in demod */
 290         reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x42);
 291         reg |= 0x80;
 292         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, reg);
 293         /* Serial mode */
 294
 295         /* Soft Reset chip */
 296
 297         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
 298         msleep(30);
 299         s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
 300
 301
 302         return 0;
 303 }
 304
 305 static int s5h1432_read_status(struct dvb_frontend *fe, enum fe_status *status)
 306 {
 307         return 0;
 308 }
 309
 310 static int s5h1432_read_signal_strength(struct dvb_frontend *fe,
 311                                         u16 *signal_strength)
 312 {
 313         return 0;
 314 }
 315
 316 static int s5h1432_read_snr(struct dvb_frontend *fe, u16 *snr)
 317 {
 318         return 0;
 319 }
 320
 321 static int s5h1432_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 322 {
 323
 324         return 0;
 325 }
 326
 327 static int s5h1432_read_ber(struct dvb_frontend *fe, u32 *ber)
 328 {
 329         return 0;
 330 }
 331
 332 static int s5h1432_get_tune_settings(struct dvb_frontend *fe,
 333                                      struct dvb_frontend_tune_settings *tune)
 334 {
 335         return 0;
 336 }
 337
 338 static void s5h1432_release(struct dvb_frontend *fe)
 339 {
 340         struct s5h1432_state *state = fe->demodulator_priv;
 341         kfree(state);
 342 }
 343
 344 static struct dvb_frontend_ops s5h1432_ops;
 345
 346 struct dvb_frontend *s5h1432_attach(const struct s5h1432_config *config,
 347                                     struct i2c_adapter *i2c)
 348 {
 349         struct s5h1432_state *state = NULL;
 350
 351         printk(KERN_INFO " Enter s5h1432_attach(). attach success!\n");
 352         /* allocate memory for the internal state */
 353         state = kmalloc(sizeof(struct s5h1432_state), GFP_KERNEL);
 354         if (!state)
 355                 return NULL;
 356
 357         /* setup the state */
 358         state->config = config;
 359         state->i2c = i2c;
 360         state->current_modulation = QAM_16;
 361         state->inversion = state->config->inversion;
 362
 363         /* create dvb_frontend */
 364         memcpy(&state->frontend.ops, &s5h1432_ops,
 365                sizeof(struct dvb_frontend_ops));
 366
 367         state->frontend.demodulator_priv = state;
 368
 369         return &state->frontend;
 370 }
 371 EXPORT_SYMBOL(s5h1432_attach);
 372
 373 static struct dvb_frontend_ops s5h1432_ops = {
 374         .delsys = { SYS_DVBT },
 375         .info = {
 376                  .name = "Samsung s5h1432 DVB-T Frontend",
 377                  .frequency_min = 177000000,
 378                  .frequency_max = 858000000,
 379                  .frequency_stepsize = 166666,
 380                  .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 381                  FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 382                  FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 383                  FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 384                  FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER},
 385
 386         .init = s5h1432_init,
 387         .sleep = s5h1432_sleep,
 388         .set_frontend = s5h1432_set_frontend,
 389         .get_tune_settings = s5h1432_get_tune_settings,
 390         .read_status = s5h1432_read_status,
 391         .read_ber = s5h1432_read_ber,
 392         .read_signal_strength = s5h1432_read_signal_strength,
 393         .read_snr = s5h1432_read_snr,
 394         .read_ucblocks = s5h1432_read_ucblocks,
 395         .release = s5h1432_release,
 396 };
 397
 398 module_param(debug, int, 0644);
 399 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 400
 401 MODULE_DESCRIPTION("Samsung s5h1432 DVB-T Demodulator driver");
 402 MODULE_AUTHOR("Bill Liu");
 403 MODULE_LICENSE("GPL");