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_adapter *i2c;
  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->cfg->i2c_address,
  42                         .flags = 0,
  43                         .len = 1 + len,
  44                         .buf = buf,
  45                 }
  46         };
  47
  48         if (1 + len > sizeof(buf)) {
  49                 dev_warn(&priv->i2c->dev,
  50                          "%s: i2c wr reg=%04x: len=%d is too big!\n",
  51                          KBUILD_MODNAME, reg, len);
  52                 return -EINVAL;
  53         }
  54
  55         buf[0] = reg;
  56         memcpy(&buf[1], val, len);
  57
  58         ret = i2c_transfer(priv->i2c, msg, 1);
  59         if (ret == 1) {
  60                 ret = 0;
  61         } else {
  62                 dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
  63                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  64                 ret = -EREMOTEIO;
  65         }
  66         return ret;
  67 }
  68
  69 /* read multiple registers */
  70 static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  71         int len)
  72 {
  73         int ret;
  74         u8 buf[MAX_XFER_SIZE];
  75         struct i2c_msg msg[2] = {
  76                 {
  77                         .addr = priv->cfg->i2c_address,
  78                         .flags = 0,
  79                         .len = 1,
  80                         .buf = &reg,
  81                 }, {
  82                         .addr = priv->cfg->i2c_address,
  83                         .flags = I2C_M_RD,
  84                         .len = len,
  85                         .buf = buf,
  86                 }
  87         };
  88
  89         if (len > sizeof(buf)) {
  90                 dev_warn(&priv->i2c->dev,
  91                          "%s: i2c rd reg=%04x: len=%d is too big!\n",
  92                          KBUILD_MODNAME, reg, len);
  93                 return -EINVAL;
  94         }
  95
  96         ret = i2c_transfer(priv->i2c, msg, 2);
  97         if (ret == 2) {
  98                 memcpy(val, buf, len);
  99                 ret = 0;
 100         } else {
 101                 dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
 102                                 "len=%d\n", KBUILD_MODNAME, 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_priv *priv, u8 reg, u8 val)
 111 {
 112         return tda18212_wr_regs(priv, reg, &val, 1);
 113 }
 114
 115 /* read single register */
 116 static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
 117 {
 118         return tda18212_rd_regs(priv, reg, val, 1);
 119 }
 120
 121 #if 0 /* keep, useful when developing driver */
 122 static void tda18212_dump_regs(struct tda18212_priv *priv)
 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(priv, 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_priv *priv = 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         static const u8 bw_params[][3] = {
 154                      /* reg:   0f    13    23 */
 155                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
 156                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
 157                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
 158                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
 159                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
 160                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
 161                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
 162                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
 163         };
 164
 165         dev_dbg(&priv->i2c->dev,
 166                         "%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n",
 167                         __func__, c->delivery_system, c->frequency,
 168                         c->bandwidth_hz);
 169
 170         if (fe->ops.i2c_gate_ctrl)
 171                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 172
 173         switch (c->delivery_system) {
 174         case SYS_DVBT:
 175                 switch (c->bandwidth_hz) {
 176                 case 6000000:
 177                         if_khz = priv->cfg->if_dvbt_6;
 178                         i = DVBT_6;
 179                         break;
 180                 case 7000000:
 181                         if_khz = priv->cfg->if_dvbt_7;
 182                         i = DVBT_7;
 183                         break;
 184                 case 8000000:
 185                         if_khz = priv->cfg->if_dvbt_8;
 186                         i = DVBT_8;
 187                         break;
 188                 default:
 189                         ret = -EINVAL;
 190                         goto error;
 191                 }
 192                 break;
 193         case SYS_DVBT2:
 194                 switch (c->bandwidth_hz) {
 195                 case 6000000:
 196                         if_khz = priv->cfg->if_dvbt2_6;
 197                         i = DVBT2_6;
 198                         break;
 199                 case 7000000:
 200                         if_khz = priv->cfg->if_dvbt2_7;
 201                         i = DVBT2_7;
 202                         break;
 203                 case 8000000:
 204                         if_khz = priv->cfg->if_dvbt2_8;
 205                         i = DVBT2_8;
 206                         break;
 207                 default:
 208                         ret = -EINVAL;
 209                         goto error;
 210                 }
 211                 break;
 212         case SYS_DVBC_ANNEX_A:
 213         case SYS_DVBC_ANNEX_C:
 214                 if_khz = priv->cfg->if_dvbc;
 215                 i = DVBC_8;
 216                 break;
 217         default:
 218                 ret = -EINVAL;
 219                 goto error;
 220         }
 221
 222         ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
 223         if (ret)
 224                 goto error;
 225
 226         ret = tda18212_wr_reg(priv, 0x06, 0x00);
 227         if (ret)
 228                 goto error;
 229
 230         ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
 231         if (ret)
 232                 goto error;
 233
 234         buf[0] = 0x02;
 235         buf[1] = bw_params[i][1];
 236         buf[2] = 0x03; /* default value */
 237         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 238         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 239         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 240         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 241         buf[7] = 0xc1;
 242         buf[8] = 0x01;
 243         ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
 244         if (ret)
 245                 goto error;
 246
 247         /* actual IF rounded as it is on register */
 248         priv->if_frequency = buf[3] * 50 * 1000;
 249
 250 exit:
 251         if (fe->ops.i2c_gate_ctrl)
 252                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 253
 254         return ret;
 255
 256 error:
 257         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 258         goto exit;
 259 }
 260
 261 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 262 {
 263         struct tda18212_priv *priv = fe->tuner_priv;
 264
 265         *frequency = priv->if_frequency;
 266
 267         return 0;
 268 }
 269
 270 static int tda18212_release(struct dvb_frontend *fe)
 271 {
 272         kfree(fe->tuner_priv);
 273         fe->tuner_priv = NULL;
 274         return 0;
 275 }
 276
 277 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 278         .info = {
 279                 .name           = "NXP TDA18212",
 280
 281                 .frequency_min  =  48000000,
 282                 .frequency_max  = 864000000,
 283                 .frequency_step =      1000,
 284         },
 285
 286         .release       = tda18212_release,
 287
 288         .set_params    = tda18212_set_params,
 289         .get_if_frequency = tda18212_get_if_frequency,
 290 };
 291
 292 struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
 293         struct i2c_adapter *i2c, struct tda18212_config *cfg)
 294 {
 295         struct tda18212_priv *priv = NULL;
 296         int ret;
 297         u8 val;
 298
 299         priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
 300         if (priv == NULL)
 301                 return NULL;
 302
 303         priv->cfg = cfg;
 304         priv->i2c = i2c;
 305         fe->tuner_priv = priv;
 306
 307         if (fe->ops.i2c_gate_ctrl)
 308                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 309
 310         /* check if the tuner is there */
 311         ret = tda18212_rd_reg(priv, 0x00, &val);
 312
 313         if (fe->ops.i2c_gate_ctrl)
 314                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 315
 316         if (!ret)
 317                 dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
 318         if (ret || val != 0xc7) {
 319                 kfree(priv);
 320                 return NULL;
 321         }
 322
 323         dev_info(&priv->i2c->dev,
 324                         "%s: NXP TDA18212HN successfully identified\n",
 325                         KBUILD_MODNAME);
 326
 327         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 328                 sizeof(struct dvb_tuner_ops));
 329
 330         return fe;
 331 }
 332 EXPORT_SYMBOL(tda18212_attach);
 333
 334 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 335 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 336 MODULE_LICENSE("GPL");