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 #include <linux/regmap.h>
  23
  24 struct tda18212_dev {
  25         struct tda18212_config cfg;
  26         struct i2c_client *client;
  27         struct regmap *regmap;
  28
  29         u32 if_frequency;
  30 };
  31
  32 static int tda18212_set_params(struct dvb_frontend *fe)
  33 {
  34         struct tda18212_dev *dev = fe->tuner_priv;
  35         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  36         int ret, i;
  37         u32 if_khz;
  38         u8 buf[9];
  39         #define DVBT_6   0
  40         #define DVBT_7   1
  41         #define DVBT_8   2
  42         #define DVBT2_6  3
  43         #define DVBT2_7  4
  44         #define DVBT2_8  5
  45         #define DVBC_6   6
  46         #define DVBC_8   7
  47         #define ATSC_VSB 8
  48         #define ATSC_QAM 9
  49         static const u8 bw_params[][3] = {
  50                      /* reg:   0f    13    23 */
  51                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
  52                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
  53                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
  54                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
  55                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
  56                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
  57                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
  58                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
  59                 [ATSC_VSB] = { 0x7d, 0x20, 0x63 },
  60                 [ATSC_QAM] = { 0x7d, 0x20, 0x63 },
  61         };
  62
  63         dev_dbg(&dev->client->dev,
  64                         "delivery_system=%d frequency=%d bandwidth_hz=%d\n",
  65                         c->delivery_system, c->frequency,
  66                         c->bandwidth_hz);
  67
  68         if (fe->ops.i2c_gate_ctrl)
  69                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
  70
  71         switch (c->delivery_system) {
  72         case SYS_ATSC:
  73                 if_khz = dev->cfg.if_atsc_vsb;
  74                 i = ATSC_VSB;
  75                 break;
  76         case SYS_DVBC_ANNEX_B:
  77                 if_khz = dev->cfg.if_atsc_qam;
  78                 i = ATSC_QAM;
  79                 break;
  80         case SYS_DVBT:
  81                 switch (c->bandwidth_hz) {
  82                 case 6000000:
  83                         if_khz = dev->cfg.if_dvbt_6;
  84                         i = DVBT_6;
  85                         break;
  86                 case 7000000:
  87                         if_khz = dev->cfg.if_dvbt_7;
  88                         i = DVBT_7;
  89                         break;
  90                 case 8000000:
  91                         if_khz = dev->cfg.if_dvbt_8;
  92                         i = DVBT_8;
  93                         break;
  94                 default:
  95                         ret = -EINVAL;
  96                         goto error;
  97                 }
  98                 break;
  99         case SYS_DVBT2:
 100                 switch (c->bandwidth_hz) {
 101                 case 6000000:
 102                         if_khz = dev->cfg.if_dvbt2_6;
 103                         i = DVBT2_6;
 104                         break;
 105                 case 7000000:
 106                         if_khz = dev->cfg.if_dvbt2_7;
 107                         i = DVBT2_7;
 108                         break;
 109                 case 8000000:
 110                         if_khz = dev->cfg.if_dvbt2_8;
 111                         i = DVBT2_8;
 112                         break;
 113                 default:
 114                         ret = -EINVAL;
 115                         goto error;
 116                 }
 117                 break;
 118         case SYS_DVBC_ANNEX_A:
 119         case SYS_DVBC_ANNEX_C:
 120                 if_khz = dev->cfg.if_dvbc;
 121                 i = DVBC_8;
 122                 break;
 123         default:
 124                 ret = -EINVAL;
 125                 goto error;
 126         }
 127
 128         ret = regmap_write(dev->regmap, 0x23, bw_params[i][2]);
 129         if (ret)
 130                 goto error;
 131
 132         ret = regmap_write(dev->regmap, 0x06, 0x00);
 133         if (ret)
 134                 goto error;
 135
 136         ret = regmap_write(dev->regmap, 0x0f, bw_params[i][0]);
 137         if (ret)
 138                 goto error;
 139
 140         buf[0] = 0x02;
 141         buf[1] = bw_params[i][1];
 142         buf[2] = 0x03; /* default value */
 143         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 144         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 145         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 146         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 147         buf[7] = 0xc1;
 148         buf[8] = 0x01;
 149         ret = regmap_bulk_write(dev->regmap, 0x12, buf, sizeof(buf));
 150         if (ret)
 151                 goto error;
 152
 153         /* actual IF rounded as it is on register */
 154         dev->if_frequency = buf[3] * 50 * 1000;
 155
 156 exit:
 157         if (fe->ops.i2c_gate_ctrl)
 158                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 159
 160         return ret;
 161
 162 error:
 163         dev_dbg(&dev->client->dev, "failed=%d\n", ret);
 164         goto exit;
 165 }
 166
 167 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 168 {
 169         struct tda18212_dev *dev = fe->tuner_priv;
 170
 171         *frequency = dev->if_frequency;
 172
 173         return 0;
 174 }
 175
 176 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 177         .info = {
 178                 .name              = "NXP TDA18212",
 179
 180                 .frequency_min_hz  =  48 * MHz,
 181                 .frequency_max_hz  = 864 * MHz,
 182                 .frequency_step_hz =   1 * kHz,
 183         },
 184
 185         .set_params    = tda18212_set_params,
 186         .get_if_frequency = tda18212_get_if_frequency,
 187 };
 188
 189 static int tda18212_probe(struct i2c_client *client,
 190                 const struct i2c_device_id *id)
 191 {
 192         struct tda18212_config *cfg = client->dev.platform_data;
 193         struct dvb_frontend *fe = cfg->fe;
 194         struct tda18212_dev *dev;
 195         int ret;
 196         unsigned int chip_id;
 197         char *version;
 198         static const struct regmap_config regmap_config = {
 199                 .reg_bits = 8,
 200                 .val_bits = 8,
 201         };
 202
 203         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 204         if (dev == NULL) {
 205                 ret = -ENOMEM;
 206                 dev_err(&client->dev, "kzalloc() failed\n");
 207                 goto err;
 208         }
 209
 210         memcpy(&dev->cfg, cfg, sizeof(struct tda18212_config));
 211         dev->client = client;
 212         dev->regmap = devm_regmap_init_i2c(client, &regmap_config);
 213         if (IS_ERR(dev->regmap)) {
 214                 ret = PTR_ERR(dev->regmap);
 215                 goto err;
 216         }
 217
 218         /* check if the tuner is there */
 219         if (fe->ops.i2c_gate_ctrl)
 220                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 221
 222         ret = regmap_read(dev->regmap, 0x00, &chip_id);
 223         dev_dbg(&dev->client->dev, "chip_id=%02x\n", chip_id);
 224
 225         if (fe->ops.i2c_gate_ctrl)
 226                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 227
 228         if (ret)
 229                 goto err;
 230
 231         switch (chip_id) {
 232         case 0xc7:
 233                 version = "M"; /* master */
 234                 break;
 235         case 0x47:
 236                 version = "S"; /* slave */
 237                 break;
 238         default:
 239                 ret = -ENODEV;
 240                 goto err;
 241         }
 242
 243         dev_info(&dev->client->dev,
 244                         "NXP TDA18212HN/%s successfully identified\n", version);
 245
 246         fe->tuner_priv = dev;
 247         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 248                         sizeof(struct dvb_tuner_ops));
 249         i2c_set_clientdata(client, dev);
 250
 251         return 0;
 252 err:
 253         dev_dbg(&client->dev, "failed=%d\n", ret);
 254         kfree(dev);
 255         return ret;
 256 }
 257
 258 static int tda18212_remove(struct i2c_client *client)
 259 {
 260         struct tda18212_dev *dev = i2c_get_clientdata(client);
 261         struct dvb_frontend *fe = dev->cfg.fe;
 262
 263         dev_dbg(&client->dev, "\n");
 264
 265         memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 266         fe->tuner_priv = NULL;
 267         kfree(dev);
 268
 269         return 0;
 270 }
 271
 272 static const struct i2c_device_id tda18212_id[] = {
 273         {"tda18212", 0},
 274         {}
 275 };
 276 MODULE_DEVICE_TABLE(i2c, tda18212_id);
 277
 278 static struct i2c_driver tda18212_driver = {
 279         .driver = {
 280                 .name   = "tda18212",
 281         },
 282         .probe          = tda18212_probe,
 283         .remove         = tda18212_remove,
 284         .id_table       = tda18212_id,
 285 };
 286
 287 module_i2c_driver(tda18212_driver);
 288
 289 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 290 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 291 MODULE_LICENSE("GPL");