drivers/media/tuners/tda18212.c

   1 /*
   2  * NXP TDA18212HN silicon tuner driver
   3  *
   4  * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
   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 along
  17  *    with this program; if not, write to the Free Software Foundation, Inc.,
  18  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include "tda18212.h"
  22
  23 /* Max transfer size done by I2C transfer functions */
  24 #define MAX_XFER_SIZE  64
  25
  26 struct tda18212_priv {
  27         struct tda18212_config cfg;
  28         struct i2c_client *client;
  29
  30         u32 if_frequency;
  31 };
  32
  33 /* write multiple registers */
  34 static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  35         int len)
  36 {
  37         int ret;
  38         u8 buf[MAX_XFER_SIZE];
  39         struct i2c_msg msg[1] = {
  40                 {
  41                         .addr = priv->client->addr,
  42                         .flags = 0,
  43                         .len = 1 + len,
  44                         .buf = buf,
  45                 }
  46         };
  47
  48         if (1 + len > sizeof(buf)) {
  49                 dev_warn(&priv->client->dev,
  50                                 "i2c wr reg=%04x: len=%d is too big!\n",
  51                                 reg, len);
  52                 return -EINVAL;
  53         }
  54
  55         buf[0] = reg;
  56         memcpy(&buf[1], val, len);
  57
  58         ret = i2c_transfer(priv->client->adapter, msg, 1);
  59         if (ret == 1) {
  60                 ret = 0;
  61         } else {
  62                 dev_warn(&priv->client->dev,
  63                                 "i2c wr failed=%d reg=%02x len=%d\n",
  64                                 ret, reg, len);
  65                 ret = -EREMOTEIO;
  66         }
  67         return ret;
  68 }
  69
  70 /* read multiple registers */
  71 static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  72         int len)
  73 {
  74         int ret;
  75         u8 buf[MAX_XFER_SIZE];
  76         struct i2c_msg msg[2] = {
  77                 {
  78                         .addr = priv->client->addr,
  79                         .flags = 0,
  80                         .len = 1,
  81                         .buf = &reg,
  82                 }, {
  83                         .addr = priv->client->addr,
  84                         .flags = I2C_M_RD,
  85                         .len = len,
  86                         .buf = buf,
  87                 }
  88         };
  89
  90         if (len > sizeof(buf)) {
  91                 dev_warn(&priv->client->dev,
  92                                 "i2c rd reg=%04x: len=%d is too big!\n",
  93                                 reg, len);
  94                 return -EINVAL;
  95         }
  96
  97         ret = i2c_transfer(priv->client->adapter, msg, 2);
  98         if (ret == 2) {
  99                 memcpy(val, buf, len);
 100                 ret = 0;
 101         } else {
 102                 dev_warn(&priv->client->dev,
 103                                 "i2c rd failed=%d reg=%02x len=%d\n",
 104                                 ret, reg, len);
 105                 ret = -EREMOTEIO;
 106         }
 107
 108         return ret;
 109 }
 110
 111 /* write single register */
 112 static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
 113 {
 114         return tda18212_wr_regs(priv, reg, &val, 1);
 115 }
 116
 117 /* read single register */
 118 static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
 119 {
 120         return tda18212_rd_regs(priv, reg, val, 1);
 121 }
 122
 123 #if 0 /* keep, useful when developing driver */
 124 static void tda18212_dump_regs(struct tda18212_priv *priv)
 125 {
 126         int i;
 127         u8 buf[256];
 128
 129         #define TDA18212_RD_LEN 32
 130         for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
 131                 tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
 132
 133         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
 134                 sizeof(buf), true);
 135
 136         return;
 137 }
 138 #endif
 139
 140 static int tda18212_set_params(struct dvb_frontend *fe)
 141 {
 142         struct tda18212_priv *priv = fe->tuner_priv;
 143         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 144         int ret, i;
 145         u32 if_khz;
 146         u8 buf[9];
 147         #define DVBT_6   0
 148         #define DVBT_7   1
 149         #define DVBT_8   2
 150         #define DVBT2_6  3
 151         #define DVBT2_7  4
 152         #define DVBT2_8  5
 153         #define DVBC_6   6
 154         #define DVBC_8   7
 155         #define ATSC_VSB 8
 156         #define ATSC_QAM 9
 157         static const u8 bw_params[][3] = {
 158                      /* reg:   0f    13    23 */
 159                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
 160                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
 161                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
 162                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
 163                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
 164                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
 165                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
 166                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
 167                 [ATSC_VSB] = { 0x7d, 0x20, 0x63 },
 168                 [ATSC_QAM] = { 0x7d, 0x20, 0x63 },
 169         };
 170
 171         dev_dbg(&priv->client->dev,
 172                         "delivery_system=%d frequency=%d bandwidth_hz=%d\n",
 173                         c->delivery_system, c->frequency,
 174                         c->bandwidth_hz);
 175
 176         if (fe->ops.i2c_gate_ctrl)
 177                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 178
 179         switch (c->delivery_system) {
 180         case SYS_ATSC:
 181                 if_khz = priv->cfg.if_atsc_vsb;
 182                 i = ATSC_VSB;
 183                 break;
 184         case SYS_DVBC_ANNEX_B:
 185                 if_khz = priv->cfg.if_atsc_qam;
 186                 i = ATSC_QAM;
 187                 break;
 188         case SYS_DVBT:
 189                 switch (c->bandwidth_hz) {
 190                 case 6000000:
 191                         if_khz = priv->cfg.if_dvbt_6;
 192                         i = DVBT_6;
 193                         break;
 194                 case 7000000:
 195                         if_khz = priv->cfg.if_dvbt_7;
 196                         i = DVBT_7;
 197                         break;
 198                 case 8000000:
 199                         if_khz = priv->cfg.if_dvbt_8;
 200                         i = DVBT_8;
 201                         break;
 202                 default:
 203                         ret = -EINVAL;
 204                         goto error;
 205                 }
 206                 break;
 207         case SYS_DVBT2:
 208                 switch (c->bandwidth_hz) {
 209                 case 6000000:
 210                         if_khz = priv->cfg.if_dvbt2_6;
 211                         i = DVBT2_6;
 212                         break;
 213                 case 7000000:
 214                         if_khz = priv->cfg.if_dvbt2_7;
 215                         i = DVBT2_7;
 216                         break;
 217                 case 8000000:
 218                         if_khz = priv->cfg.if_dvbt2_8;
 219                         i = DVBT2_8;
 220                         break;
 221                 default:
 222                         ret = -EINVAL;
 223                         goto error;
 224                 }
 225                 break;
 226         case SYS_DVBC_ANNEX_A:
 227         case SYS_DVBC_ANNEX_C:
 228                 if_khz = priv->cfg.if_dvbc;
 229                 i = DVBC_8;
 230                 break;
 231         default:
 232                 ret = -EINVAL;
 233                 goto error;
 234         }
 235
 236         ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
 237         if (ret)
 238                 goto error;
 239
 240         ret = tda18212_wr_reg(priv, 0x06, 0x00);
 241         if (ret)
 242                 goto error;
 243
 244         ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
 245         if (ret)
 246                 goto error;
 247
 248         buf[0] = 0x02;
 249         buf[1] = bw_params[i][1];
 250         buf[2] = 0x03; /* default value */
 251         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 252         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 253         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 254         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 255         buf[7] = 0xc1;
 256         buf[8] = 0x01;
 257         ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
 258         if (ret)
 259                 goto error;
 260
 261         /* actual IF rounded as it is on register */
 262         priv->if_frequency = buf[3] * 50 * 1000;
 263
 264 exit:
 265         if (fe->ops.i2c_gate_ctrl)
 266                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 267
 268         return ret;
 269
 270 error:
 271         dev_dbg(&priv->client->dev, "failed=%d\n", ret);
 272         goto exit;
 273 }
 274
 275 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 276 {
 277         struct tda18212_priv *priv = fe->tuner_priv;
 278
 279         *frequency = priv->if_frequency;
 280
 281         return 0;
 282 }
 283
 284 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 285         .info = {
 286                 .name           = "NXP TDA18212",
 287
 288                 .frequency_min  =  48000000,
 289                 .frequency_max  = 864000000,
 290                 .frequency_step =      1000,
 291         },
 292
 293         .set_params    = tda18212_set_params,
 294         .get_if_frequency = tda18212_get_if_frequency,
 295 };
 296
 297 static int tda18212_probe(struct i2c_client *client,
 298                 const struct i2c_device_id *id)
 299 {
 300         struct tda18212_config *cfg = client->dev.platform_data;
 301         struct dvb_frontend *fe = cfg->fe;
 302         struct tda18212_priv *priv;
 303         int ret;
 304         u8 chip_id = chip_id;
 305         char *version;
 306
 307         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 308         if (!priv) {
 309                 ret = -ENOMEM;
 310                 dev_err(&client->dev, "kzalloc() failed\n");
 311                 goto err;
 312         }
 313
 314         memcpy(&priv->cfg, cfg, sizeof(struct tda18212_config));
 315         priv->client = client;
 316
 317         /* check if the tuner is there */
 318         if (fe->ops.i2c_gate_ctrl)
 319                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 320
 321         ret = tda18212_rd_reg(priv, 0x00, &chip_id);
 322         dev_dbg(&priv->client->dev, "chip_id=%02x\n", chip_id);
 323
 324         if (fe->ops.i2c_gate_ctrl)
 325                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 326
 327         if (ret)
 328                 goto err;
 329
 330         switch (chip_id) {
 331         case 0xc7:
 332                 version = "M"; /* master */
 333                 break;
 334         case 0x47:
 335                 version = "S"; /* slave */
 336                 break;
 337         default:
 338                 ret = -ENODEV;
 339                 goto err;
 340         }
 341
 342         dev_info(&priv->client->dev,
 343                         "NXP TDA18212HN/%s successfully identified\n", version);
 344
 345         fe->tuner_priv = priv;
 346         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 347                         sizeof(struct dvb_tuner_ops));
 348         i2c_set_clientdata(client, priv);
 349
 350         return 0;
 351 err:
 352         dev_dbg(&client->dev, "failed=%d\n", ret);
 353         kfree(priv);
 354         return ret;
 355 }
 356
 357 static int tda18212_remove(struct i2c_client *client)
 358 {
 359         struct tda18212_priv *priv = i2c_get_clientdata(client);
 360         struct dvb_frontend *fe = priv->cfg.fe;
 361
 362         dev_dbg(&client->dev, "\n");
 363
 364         memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 365         fe->tuner_priv = NULL;
 366         kfree(priv);
 367
 368         return 0;
 369 }
 370
 371 static const struct i2c_device_id tda18212_id[] = {
 372         {"tda18212", 0},
 373         {}
 374 };
 375 MODULE_DEVICE_TABLE(i2c, tda18212_id);
 376
 377 static struct i2c_driver tda18212_driver = {
 378         .driver = {
 379                 .owner  = THIS_MODULE,
 380                 .name   = "tda18212",
 381         },
 382         .probe          = tda18212_probe,
 383         .remove         = tda18212_remove,
 384         .id_table       = tda18212_id,
 385 };
 386
 387 module_i2c_driver(tda18212_driver);
 388
 389 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 390 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 391 MODULE_LICENSE("GPL");