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 struct tda18212_priv {
  24         struct tda18212_config *cfg;
  25         struct i2c_adapter *i2c;
  26
  27         u32 if_frequency;
  28 };
  29
  30 /* write multiple registers */
  31 static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  32         int len)
  33 {
  34         int ret;
  35         u8 buf[len+1];
  36         struct i2c_msg msg[1] = {
  37                 {
  38                         .addr = priv->cfg->i2c_address,
  39                         .flags = 0,
  40                         .len = sizeof(buf),
  41                         .buf = buf,
  42                 }
  43         };
  44
  45         buf[0] = reg;
  46         memcpy(&buf[1], val, len);
  47
  48         ret = i2c_transfer(priv->i2c, msg, 1);
  49         if (ret == 1) {
  50                 ret = 0;
  51         } else {
  52                 dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
  53                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  54                 ret = -EREMOTEIO;
  55         }
  56         return ret;
  57 }
  58
  59 /* read multiple registers */
  60 static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  61         int len)
  62 {
  63         int ret;
  64         u8 buf[len];
  65         struct i2c_msg msg[2] = {
  66                 {
  67                         .addr = priv->cfg->i2c_address,
  68                         .flags = 0,
  69                         .len = 1,
  70                         .buf = &reg,
  71                 }, {
  72                         .addr = priv->cfg->i2c_address,
  73                         .flags = I2C_M_RD,
  74                         .len = sizeof(buf),
  75                         .buf = buf,
  76                 }
  77         };
  78
  79         ret = i2c_transfer(priv->i2c, msg, 2);
  80         if (ret == 2) {
  81                 memcpy(val, buf, len);
  82                 ret = 0;
  83         } else {
  84                 dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
  85                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  86                 ret = -EREMOTEIO;
  87         }
  88
  89         return ret;
  90 }
  91
  92 /* write single register */
  93 static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
  94 {
  95         return tda18212_wr_regs(priv, reg, &val, 1);
  96 }
  97
  98 /* read single register */
  99 static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
 100 {
 101         return tda18212_rd_regs(priv, reg, val, 1);
 102 }
 103
 104 #if 0 /* keep, useful when developing driver */
 105 static void tda18212_dump_regs(struct tda18212_priv *priv)
 106 {
 107         int i;
 108         u8 buf[256];
 109
 110         #define TDA18212_RD_LEN 32
 111         for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
 112                 tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
 113
 114         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
 115                 sizeof(buf), true);
 116
 117         return;
 118 }
 119 #endif
 120
 121 static int tda18212_set_params(struct dvb_frontend *fe)
 122 {
 123         struct tda18212_priv *priv = fe->tuner_priv;
 124         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 125         int ret, i;
 126         u32 if_khz;
 127         u8 buf[9];
 128         #define DVBT_6   0
 129         #define DVBT_7   1
 130         #define DVBT_8   2
 131         #define DVBT2_6  3
 132         #define DVBT2_7  4
 133         #define DVBT2_8  5
 134         #define DVBC_6   6
 135         #define DVBC_8   7
 136         static const u8 bw_params[][3] = {
 137                      /* reg:   0f    13    23 */
 138                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
 139                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
 140                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
 141                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
 142                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
 143                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
 144                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
 145                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
 146         };
 147
 148         dev_dbg(&priv->i2c->dev,
 149                         "%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n",
 150                         __func__, c->delivery_system, c->frequency,
 151                         c->bandwidth_hz);
 152
 153         if (fe->ops.i2c_gate_ctrl)
 154                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 155
 156         switch (c->delivery_system) {
 157         case SYS_DVBT:
 158                 switch (c->bandwidth_hz) {
 159                 case 6000000:
 160                         if_khz = priv->cfg->if_dvbt_6;
 161                         i = DVBT_6;
 162                         break;
 163                 case 7000000:
 164                         if_khz = priv->cfg->if_dvbt_7;
 165                         i = DVBT_7;
 166                         break;
 167                 case 8000000:
 168                         if_khz = priv->cfg->if_dvbt_8;
 169                         i = DVBT_8;
 170                         break;
 171                 default:
 172                         ret = -EINVAL;
 173                         goto error;
 174                 }
 175                 break;
 176         case SYS_DVBT2:
 177                 switch (c->bandwidth_hz) {
 178                 case 6000000:
 179                         if_khz = priv->cfg->if_dvbt2_6;
 180                         i = DVBT2_6;
 181                         break;
 182                 case 7000000:
 183                         if_khz = priv->cfg->if_dvbt2_7;
 184                         i = DVBT2_7;
 185                         break;
 186                 case 8000000:
 187                         if_khz = priv->cfg->if_dvbt2_8;
 188                         i = DVBT2_8;
 189                         break;
 190                 default:
 191                         ret = -EINVAL;
 192                         goto error;
 193                 }
 194                 break;
 195         case SYS_DVBC_ANNEX_A:
 196         case SYS_DVBC_ANNEX_C:
 197                 if_khz = priv->cfg->if_dvbc;
 198                 i = DVBC_8;
 199                 break;
 200         default:
 201                 ret = -EINVAL;
 202                 goto error;
 203         }
 204
 205         ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
 206         if (ret)
 207                 goto error;
 208
 209         ret = tda18212_wr_reg(priv, 0x06, 0x00);
 210         if (ret)
 211                 goto error;
 212
 213         ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
 214         if (ret)
 215                 goto error;
 216
 217         buf[0] = 0x02;
 218         buf[1] = bw_params[i][1];
 219         buf[2] = 0x03; /* default value */
 220         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 221         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 222         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 223         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 224         buf[7] = 0xc1;
 225         buf[8] = 0x01;
 226         ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
 227         if (ret)
 228                 goto error;
 229
 230         /* actual IF rounded as it is on register */
 231         priv->if_frequency = buf[3] * 50 * 1000;
 232
 233 exit:
 234         if (fe->ops.i2c_gate_ctrl)
 235                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 236
 237         return ret;
 238
 239 error:
 240         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 241         goto exit;
 242 }
 243
 244 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 245 {
 246         struct tda18212_priv *priv = fe->tuner_priv;
 247
 248         *frequency = priv->if_frequency;
 249
 250         return 0;
 251 }
 252
 253 static int tda18212_release(struct dvb_frontend *fe)
 254 {
 255         kfree(fe->tuner_priv);
 256         fe->tuner_priv = NULL;
 257         return 0;
 258 }
 259
 260 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 261         .info = {
 262                 .name           = "NXP TDA18212",
 263
 264                 .frequency_min  =  48000000,
 265                 .frequency_max  = 864000000,
 266                 .frequency_step =      1000,
 267         },
 268
 269         .release       = tda18212_release,
 270
 271         .set_params    = tda18212_set_params,
 272         .get_if_frequency = tda18212_get_if_frequency,
 273 };
 274
 275 struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
 276         struct i2c_adapter *i2c, struct tda18212_config *cfg)
 277 {
 278         struct tda18212_priv *priv = NULL;
 279         int ret;
 280         u8 val;
 281
 282         priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
 283         if (priv == NULL)
 284                 return NULL;
 285
 286         priv->cfg = cfg;
 287         priv->i2c = i2c;
 288         fe->tuner_priv = priv;
 289
 290         if (fe->ops.i2c_gate_ctrl)
 291                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 292
 293         /* check if the tuner is there */
 294         ret = tda18212_rd_reg(priv, 0x00, &val);
 295
 296         if (fe->ops.i2c_gate_ctrl)
 297                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 298
 299         if (!ret)
 300                 dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
 301         if (ret || val != 0xc7) {
 302                 kfree(priv);
 303                 return NULL;
 304         }
 305
 306         dev_info(&priv->i2c->dev,
 307                         "%s: NXP TDA18212HN successfully identified\n",
 308                         KBUILD_MODNAME);
 309
 310         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 311                 sizeof(struct dvb_tuner_ops));
 312
 313         return fe;
 314 }
 315 EXPORT_SYMBOL(tda18212_attach);
 316
 317 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 318 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 319 MODULE_LICENSE("GPL");