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_dev {
  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_dev *dev, u8 reg, u8 *val, int len)
  35 {
  36         int ret;
  37         u8 buf[MAX_XFER_SIZE];
  38         struct i2c_msg msg[1] = {
  39                 {
  40                         .addr = dev->client->addr,
  41                         .flags = 0,
  42                         .len = 1 + len,
  43                         .buf = buf,
  44                 }
  45         };
  46
  47         if (1 + len > sizeof(buf)) {
  48                 dev_warn(&dev->client->dev,
  49                                 "i2c wr reg=%04x: len=%d is too big!\n",
  50                                 reg, len);
  51                 return -EINVAL;
  52         }
  53
  54         buf[0] = reg;
  55         memcpy(&buf[1], val, len);
  56
  57         ret = i2c_transfer(dev->client->adapter, msg, 1);
  58         if (ret == 1) {
  59                 ret = 0;
  60         } else {
  61                 dev_warn(&dev->client->dev,
  62                                 "i2c wr failed=%d reg=%02x len=%d\n",
  63                                 ret, reg, len);
  64                 ret = -EREMOTEIO;
  65         }
  66         return ret;
  67 }
  68
  69 /* read multiple registers */
  70 static int tda18212_rd_regs(struct tda18212_dev *dev, u8 reg, u8 *val, int len)
  71 {
  72         int ret;
  73         u8 buf[MAX_XFER_SIZE];
  74         struct i2c_msg msg[2] = {
  75                 {
  76                         .addr = dev->client->addr,
  77                         .flags = 0,
  78                         .len = 1,
  79                         .buf = &reg,
  80                 }, {
  81                         .addr = dev->client->addr,
  82                         .flags = I2C_M_RD,
  83                         .len = len,
  84                         .buf = buf,
  85                 }
  86         };
  87
  88         if (len > sizeof(buf)) {
  89                 dev_warn(&dev->client->dev,
  90                                 "i2c rd reg=%04x: len=%d is too big!\n",
  91                                 reg, len);
  92                 return -EINVAL;
  93         }
  94
  95         ret = i2c_transfer(dev->client->adapter, msg, 2);
  96         if (ret == 2) {
  97                 memcpy(val, buf, len);
  98                 ret = 0;
  99         } else {
 100                 dev_warn(&dev->client->dev,
 101                                 "i2c rd failed=%d reg=%02x len=%d\n",
 102                                 ret, reg, len);
 103                 ret = -EREMOTEIO;
 104         }
 105
 106         return ret;
 107 }
 108
 109 /* write single register */
 110 static int tda18212_wr_reg(struct tda18212_dev *dev, u8 reg, u8 val)
 111 {
 112         return tda18212_wr_regs(dev, reg, &val, 1);
 113 }
 114
 115 /* read single register */
 116 static int tda18212_rd_reg(struct tda18212_dev *dev, u8 reg, u8 *val)
 117 {
 118         return tda18212_rd_regs(dev, reg, val, 1);
 119 }
 120
 121 #if 0 /* keep, useful when developing driver */
 122 static void tda18212_dump_regs(struct tda18212_dev *dev)
 123 {
 124         int i;
 125         u8 buf[256];
 126
 127         #define TDA18212_RD_LEN 32
 128         for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
 129                 tda18212_rd_regs(dev, i, &buf[i], TDA18212_RD_LEN);
 130
 131         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
 132                 sizeof(buf), true);
 133
 134         return;
 135 }
 136 #endif
 137
 138 static int tda18212_set_params(struct dvb_frontend *fe)
 139 {
 140         struct tda18212_dev *dev = fe->tuner_priv;
 141         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 142         int ret, i;
 143         u32 if_khz;
 144         u8 buf[9];
 145         #define DVBT_6   0
 146         #define DVBT_7   1
 147         #define DVBT_8   2
 148         #define DVBT2_6  3
 149         #define DVBT2_7  4
 150         #define DVBT2_8  5
 151         #define DVBC_6   6
 152         #define DVBC_8   7
 153         #define ATSC_VSB 8
 154         #define ATSC_QAM 9
 155         static const u8 bw_params[][3] = {
 156                      /* reg:   0f    13    23 */
 157                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
 158                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
 159                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
 160                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
 161                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
 162                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
 163                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
 164                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
 165                 [ATSC_VSB] = { 0x7d, 0x20, 0x63 },
 166                 [ATSC_QAM] = { 0x7d, 0x20, 0x63 },
 167         };
 168
 169         dev_dbg(&dev->client->dev,
 170                         "delivery_system=%d frequency=%d bandwidth_hz=%d\n",
 171                         c->delivery_system, c->frequency,
 172                         c->bandwidth_hz);
 173
 174         if (fe->ops.i2c_gate_ctrl)
 175                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 176
 177         switch (c->delivery_system) {
 178         case SYS_ATSC:
 179                 if_khz = dev->cfg.if_atsc_vsb;
 180                 i = ATSC_VSB;
 181                 break;
 182         case SYS_DVBC_ANNEX_B:
 183                 if_khz = dev->cfg.if_atsc_qam;
 184                 i = ATSC_QAM;
 185                 break;
 186         case SYS_DVBT:
 187                 switch (c->bandwidth_hz) {
 188                 case 6000000:
 189                         if_khz = dev->cfg.if_dvbt_6;
 190                         i = DVBT_6;
 191                         break;
 192                 case 7000000:
 193                         if_khz = dev->cfg.if_dvbt_7;
 194                         i = DVBT_7;
 195                         break;
 196                 case 8000000:
 197                         if_khz = dev->cfg.if_dvbt_8;
 198                         i = DVBT_8;
 199                         break;
 200                 default:
 201                         ret = -EINVAL;
 202                         goto error;
 203                 }
 204                 break;
 205         case SYS_DVBT2:
 206                 switch (c->bandwidth_hz) {
 207                 case 6000000:
 208                         if_khz = dev->cfg.if_dvbt2_6;
 209                         i = DVBT2_6;
 210                         break;
 211                 case 7000000:
 212                         if_khz = dev->cfg.if_dvbt2_7;
 213                         i = DVBT2_7;
 214                         break;
 215                 case 8000000:
 216                         if_khz = dev->cfg.if_dvbt2_8;
 217                         i = DVBT2_8;
 218                         break;
 219                 default:
 220                         ret = -EINVAL;
 221                         goto error;
 222                 }
 223                 break;
 224         case SYS_DVBC_ANNEX_A:
 225         case SYS_DVBC_ANNEX_C:
 226                 if_khz = dev->cfg.if_dvbc;
 227                 i = DVBC_8;
 228                 break;
 229         default:
 230                 ret = -EINVAL;
 231                 goto error;
 232         }
 233
 234         ret = tda18212_wr_reg(dev, 0x23, bw_params[i][2]);
 235         if (ret)
 236                 goto error;
 237
 238         ret = tda18212_wr_reg(dev, 0x06, 0x00);
 239         if (ret)
 240                 goto error;
 241
 242         ret = tda18212_wr_reg(dev, 0x0f, bw_params[i][0]);
 243         if (ret)
 244                 goto error;
 245
 246         buf[0] = 0x02;
 247         buf[1] = bw_params[i][1];
 248         buf[2] = 0x03; /* default value */
 249         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 250         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 251         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 252         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 253         buf[7] = 0xc1;
 254         buf[8] = 0x01;
 255         ret = tda18212_wr_regs(dev, 0x12, buf, sizeof(buf));
 256         if (ret)
 257                 goto error;
 258
 259         /* actual IF rounded as it is on register */
 260         dev->if_frequency = buf[3] * 50 * 1000;
 261
 262 exit:
 263         if (fe->ops.i2c_gate_ctrl)
 264                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 265
 266         return ret;
 267
 268 error:
 269         dev_dbg(&dev->client->dev, "failed=%d\n", ret);
 270         goto exit;
 271 }
 272
 273 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 274 {
 275         struct tda18212_dev *dev = fe->tuner_priv;
 276
 277         *frequency = dev->if_frequency;
 278
 279         return 0;
 280 }
 281
 282 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 283         .info = {
 284                 .name           = "NXP TDA18212",
 285
 286                 .frequency_min  =  48000000,
 287                 .frequency_max  = 864000000,
 288                 .frequency_step =      1000,
 289         },
 290
 291         .set_params    = tda18212_set_params,
 292         .get_if_frequency = tda18212_get_if_frequency,
 293 };
 294
 295 static int tda18212_probe(struct i2c_client *client,
 296                 const struct i2c_device_id *id)
 297 {
 298         struct tda18212_config *cfg = client->dev.platform_data;
 299         struct dvb_frontend *fe = cfg->fe;
 300         struct tda18212_dev *dev;
 301         int ret;
 302         u8 chip_id = chip_id;
 303         char *version;
 304
 305         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 306         if (dev == NULL) {
 307                 ret = -ENOMEM;
 308                 dev_err(&client->dev, "kzalloc() failed\n");
 309                 goto err;
 310         }
 311
 312         memcpy(&dev->cfg, cfg, sizeof(struct tda18212_config));
 313         dev->client = client;
 314
 315         /* check if the tuner is there */
 316         if (fe->ops.i2c_gate_ctrl)
 317                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 318
 319         ret = tda18212_rd_reg(dev, 0x00, &chip_id);
 320         dev_dbg(&dev->client->dev, "chip_id=%02x\n", chip_id);
 321
 322         if (fe->ops.i2c_gate_ctrl)
 323                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 324
 325         if (ret)
 326                 goto err;
 327
 328         switch (chip_id) {
 329         case 0xc7:
 330                 version = "M"; /* master */
 331                 break;
 332         case 0x47:
 333                 version = "S"; /* slave */
 334                 break;
 335         default:
 336                 ret = -ENODEV;
 337                 goto err;
 338         }
 339
 340         dev_info(&dev->client->dev,
 341                         "NXP TDA18212HN/%s successfully identified\n", version);
 342
 343         fe->tuner_priv = dev;
 344         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 345                         sizeof(struct dvb_tuner_ops));
 346         i2c_set_clientdata(client, dev);
 347
 348         return 0;
 349 err:
 350         dev_dbg(&client->dev, "failed=%d\n", ret);
 351         kfree(dev);
 352         return ret;
 353 }
 354
 355 static int tda18212_remove(struct i2c_client *client)
 356 {
 357         struct tda18212_dev *dev = i2c_get_clientdata(client);
 358         struct dvb_frontend *fe = dev->cfg.fe;
 359
 360         dev_dbg(&client->dev, "\n");
 361
 362         memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 363         fe->tuner_priv = NULL;
 364         kfree(dev);
 365
 366         return 0;
 367 }
 368
 369 static const struct i2c_device_id tda18212_id[] = {
 370         {"tda18212", 0},
 371         {}
 372 };
 373 MODULE_DEVICE_TABLE(i2c, tda18212_id);
 374
 375 static struct i2c_driver tda18212_driver = {
 376         .driver = {
 377                 .owner  = THIS_MODULE,
 378                 .name   = "tda18212",
 379         },
 380         .probe          = tda18212_probe,
 381         .remove         = tda18212_remove,
 382         .id_table       = tda18212_id,
 383 };
 384
 385 module_i2c_driver(tda18212_driver);
 386
 387 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 388 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 389 MODULE_LICENSE("GPL");