drivers/media/common/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include "tda18212.h"
  24
  25 struct tda18212_priv {
  26         struct tda18212_config *cfg;
  27         struct i2c_adapter *i2c;
  28
  29         u32 if_frequency;
  30 };
  31
  32 #define dbg(fmt, arg...)                                        \
  33 do {                                                            \
  34         if (debug)                                              \
  35                 pr_info("%s: " fmt, __func__, ##arg);           \
  36 } while (0)
  37
  38 static int debug;
  39 module_param(debug, int, 0644);
  40 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  41
  42 /* write multiple registers */
  43 static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  44         int len)
  45 {
  46         int ret;
  47         u8 buf[len+1];
  48         struct i2c_msg msg[1] = {
  49                 {
  50                         .addr = priv->cfg->i2c_address,
  51                         .flags = 0,
  52                         .len = sizeof(buf),
  53                         .buf = buf,
  54                 }
  55         };
  56
  57         buf[0] = reg;
  58         memcpy(&buf[1], val, len);
  59
  60         ret = i2c_transfer(priv->i2c, msg, 1);
  61         if (ret == 1) {
  62                 ret = 0;
  63         } else {
  64                 pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
  65                         ret, reg, len);
  66                 ret = -EREMOTEIO;
  67         }
  68         return ret;
  69 }
  70
  71 /* read multiple registers */
  72 static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
  73         int len)
  74 {
  75         int ret;
  76         u8 buf[len];
  77         struct i2c_msg msg[2] = {
  78                 {
  79                         .addr = priv->cfg->i2c_address,
  80                         .flags = 0,
  81                         .len = 1,
  82                         .buf = &reg,
  83                 }, {
  84                         .addr = priv->cfg->i2c_address,
  85                         .flags = I2C_M_RD,
  86                         .len = sizeof(buf),
  87                         .buf = buf,
  88                 }
  89         };
  90
  91         ret = i2c_transfer(priv->i2c, msg, 2);
  92         if (ret == 2) {
  93                 memcpy(val, buf, len);
  94                 ret = 0;
  95         } else {
  96                 pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
  97                         ret, reg, len);
  98                 ret = -EREMOTEIO;
  99         }
 100
 101         return ret;
 102 }
 103
 104 /* write single register */
 105 static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
 106 {
 107         return tda18212_wr_regs(priv, reg, &val, 1);
 108 }
 109
 110 /* read single register */
 111 static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
 112 {
 113         return tda18212_rd_regs(priv, reg, val, 1);
 114 }
 115
 116 #if 0 /* keep, useful when developing driver */
 117 static void tda18212_dump_regs(struct tda18212_priv *priv)
 118 {
 119         int i;
 120         u8 buf[256];
 121
 122         #define TDA18212_RD_LEN 32
 123         for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
 124                 tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
 125
 126         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
 127                 sizeof(buf), true);
 128
 129         return;
 130 }
 131 #endif
 132
 133 static int tda18212_set_params(struct dvb_frontend *fe)
 134 {
 135         struct tda18212_priv *priv = fe->tuner_priv;
 136         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 137         int ret, i;
 138         u32 if_khz;
 139         u8 buf[9];
 140         #define DVBT_6   0
 141         #define DVBT_7   1
 142         #define DVBT_8   2
 143         #define DVBT2_6  3
 144         #define DVBT2_7  4
 145         #define DVBT2_8  5
 146         #define DVBC_6   6
 147         #define DVBC_8   7
 148         static const u8 bw_params[][3] = {
 149                      /* reg:   0f    13    23 */
 150                 [DVBT_6]  = { 0xb3, 0x20, 0x03 },
 151                 [DVBT_7]  = { 0xb3, 0x31, 0x01 },
 152                 [DVBT_8]  = { 0xb3, 0x22, 0x01 },
 153                 [DVBT2_6] = { 0xbc, 0x20, 0x03 },
 154                 [DVBT2_7] = { 0xbc, 0x72, 0x03 },
 155                 [DVBT2_8] = { 0xbc, 0x22, 0x01 },
 156                 [DVBC_6]  = { 0x92, 0x50, 0x03 },
 157                 [DVBC_8]  = { 0x92, 0x53, 0x03 },
 158         };
 159
 160         dbg("delsys=%d RF=%d BW=%d\n",
 161             c->delivery_system, c->frequency, c->bandwidth_hz);
 162
 163         if (fe->ops.i2c_gate_ctrl)
 164                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 165
 166         switch (c->delivery_system) {
 167         case SYS_DVBT:
 168                 switch (c->bandwidth_hz) {
 169                 case 6000000:
 170                         if_khz = priv->cfg->if_dvbt_6;
 171                         i = DVBT_6;
 172                         break;
 173                 case 7000000:
 174                         if_khz = priv->cfg->if_dvbt_7;
 175                         i = DVBT_7;
 176                         break;
 177                 case 8000000:
 178                         if_khz = priv->cfg->if_dvbt_8;
 179                         i = DVBT_8;
 180                         break;
 181                 default:
 182                         ret = -EINVAL;
 183                         goto error;
 184                 }
 185                 break;
 186         case SYS_DVBT2:
 187                 switch (c->bandwidth_hz) {
 188                 case 6000000:
 189                         if_khz = priv->cfg->if_dvbt2_6;
 190                         i = DVBT2_6;
 191                         break;
 192                 case 7000000:
 193                         if_khz = priv->cfg->if_dvbt2_7;
 194                         i = DVBT2_7;
 195                         break;
 196                 case 8000000:
 197                         if_khz = priv->cfg->if_dvbt2_8;
 198                         i = DVBT2_8;
 199                         break;
 200                 default:
 201                         ret = -EINVAL;
 202                         goto error;
 203                 }
 204                 break;
 205         case SYS_DVBC_ANNEX_A:
 206         case SYS_DVBC_ANNEX_C:
 207                 if_khz = priv->cfg->if_dvbc;
 208                 i = DVBC_8;
 209                 break;
 210         default:
 211                 ret = -EINVAL;
 212                 goto error;
 213         }
 214
 215         ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
 216         if (ret)
 217                 goto error;
 218
 219         ret = tda18212_wr_reg(priv, 0x06, 0x00);
 220         if (ret)
 221                 goto error;
 222
 223         ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
 224         if (ret)
 225                 goto error;
 226
 227         buf[0] = 0x02;
 228         buf[1] = bw_params[i][1];
 229         buf[2] = 0x03; /* default value */
 230         buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
 231         buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
 232         buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
 233         buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
 234         buf[7] = 0xc1;
 235         buf[8] = 0x01;
 236         ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
 237         if (ret)
 238                 goto error;
 239
 240         /* actual IF rounded as it is on register */
 241         priv->if_frequency = buf[3] * 50 * 1000;
 242
 243 exit:
 244         if (fe->ops.i2c_gate_ctrl)
 245                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 246
 247         return ret;
 248
 249 error:
 250         dbg("failed:%d\n", ret);
 251         goto exit;
 252 }
 253
 254 static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 255 {
 256         struct tda18212_priv *priv = fe->tuner_priv;
 257
 258         *frequency = priv->if_frequency;
 259
 260         return 0;
 261 }
 262
 263 static int tda18212_release(struct dvb_frontend *fe)
 264 {
 265         kfree(fe->tuner_priv);
 266         fe->tuner_priv = NULL;
 267         return 0;
 268 }
 269
 270 static const struct dvb_tuner_ops tda18212_tuner_ops = {
 271         .info = {
 272                 .name           = "NXP TDA18212",
 273
 274                 .frequency_min  =  48000000,
 275                 .frequency_max  = 864000000,
 276                 .frequency_step =      1000,
 277         },
 278
 279         .release       = tda18212_release,
 280
 281         .set_params    = tda18212_set_params,
 282         .get_if_frequency = tda18212_get_if_frequency,
 283 };
 284
 285 struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
 286         struct i2c_adapter *i2c, struct tda18212_config *cfg)
 287 {
 288         struct tda18212_priv *priv = NULL;
 289         int ret;
 290         u8 val;
 291
 292         priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
 293         if (priv == NULL)
 294                 return NULL;
 295
 296         priv->cfg = cfg;
 297         priv->i2c = i2c;
 298         fe->tuner_priv = priv;
 299
 300         if (fe->ops.i2c_gate_ctrl)
 301                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 302
 303         /* check if the tuner is there */
 304         ret = tda18212_rd_reg(priv, 0x00, &val);
 305
 306         if (fe->ops.i2c_gate_ctrl)
 307                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 308
 309         dbg("ret:%d chip ID:%02x\n", ret, val);
 310         if (ret || val != 0xc7) {
 311                 kfree(priv);
 312                 return NULL;
 313         }
 314
 315         pr_info("NXP TDA18212HN successfully identified\n");
 316
 317         memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
 318                 sizeof(struct dvb_tuner_ops));
 319
 320         return fe;
 321 }
 322 EXPORT_SYMBOL(tda18212_attach);
 323
 324 MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
 325 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 326 MODULE_LICENSE("GPL");