drivers/media/tuners/tda18218.c

   1 /*
   2  * NXP TDA18218HN silicon tuner driver
   3  *
   4  * Copyright (C) 2010 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
  17 #include "tda18218_priv.h"
  18
  19 /* Max transfer size done by I2C transfer functions */
  20 #define MAX_XFER_SIZE  64
  21
  22 /* write multiple registers */
  23 static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
  24 {
  25         int ret = 0, len2, remaining;
  26         u8 buf[MAX_XFER_SIZE];
  27         struct i2c_msg msg[1] = {
  28                 {
  29                         .addr = priv->cfg->i2c_address,
  30                         .flags = 0,
  31                         .buf = buf,
  32                 }
  33         };
  34
  35         if (1 + len > sizeof(buf)) {
  36                 dev_warn(&priv->i2c->dev,
  37                          "%s: i2c wr reg=%04x: len=%d is too big!\n",
  38                          KBUILD_MODNAME, reg, len);
  39                 return -EINVAL;
  40         }
  41
  42         for (remaining = len; remaining > 0;
  43                         remaining -= (priv->cfg->i2c_wr_max - 1)) {
  44                 len2 = remaining;
  45                 if (len2 > (priv->cfg->i2c_wr_max - 1))
  46                         len2 = (priv->cfg->i2c_wr_max - 1);
  47
  48                 msg[0].len = 1 + len2;
  49                 buf[0] = reg + len - remaining;
  50                 memcpy(&buf[1], &val[len - remaining], len2);
  51
  52                 ret = i2c_transfer(priv->i2c, msg, 1);
  53                 if (ret != 1)
  54                         break;
  55         }
  56
  57         if (ret == 1) {
  58                 ret = 0;
  59         } else {
  60                 dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
  61                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  62                 ret = -EREMOTEIO;
  63         }
  64
  65         return ret;
  66 }
  67
  68 /* read multiple registers */
  69 static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
  70 {
  71         int ret;
  72         u8 buf[MAX_XFER_SIZE]; /* we must start read always from reg 0x00 */
  73         struct i2c_msg msg[2] = {
  74                 {
  75                         .addr = priv->cfg->i2c_address,
  76                         .flags = 0,
  77                         .len = 1,
  78                         .buf = "\x00",
  79                 }, {
  80                         .addr = priv->cfg->i2c_address,
  81                         .flags = I2C_M_RD,
  82                         .len = reg + len,
  83                         .buf = buf,
  84                 }
  85         };
  86
  87         if (reg + len > sizeof(buf)) {
  88                 dev_warn(&priv->i2c->dev,
  89                          "%s: i2c wr reg=%04x: len=%d is too big!\n",
  90                          KBUILD_MODNAME, reg, len);
  91                 return -EINVAL;
  92         }
  93
  94         ret = i2c_transfer(priv->i2c, msg, 2);
  95         if (ret == 2) {
  96                 memcpy(val, &buf[reg], len);
  97                 ret = 0;
  98         } else {
  99                 dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
 100                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
 101                 ret = -EREMOTEIO;
 102         }
 103
 104         return ret;
 105 }
 106
 107 /* write single register */
 108 static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val)
 109 {
 110         return tda18218_wr_regs(priv, reg, &val, 1);
 111 }
 112
 113 /* read single register */
 114
 115 static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val)
 116 {
 117         return tda18218_rd_regs(priv, reg, val, 1);
 118 }
 119
 120 static int tda18218_set_params(struct dvb_frontend *fe)
 121 {
 122         struct tda18218_priv *priv = fe->tuner_priv;
 123         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 124         u32 bw = c->bandwidth_hz;
 125         int ret;
 126         u8 buf[3], i, BP_Filter, LP_Fc;
 127         u32 LO_Frac;
 128         /* TODO: find out correct AGC algorithm */
 129         u8 agc[][2] = {
 130                 { R20_AGC11, 0x60 },
 131                 { R23_AGC21, 0x02 },
 132                 { R20_AGC11, 0xa0 },
 133                 { R23_AGC21, 0x09 },
 134                 { R20_AGC11, 0xe0 },
 135                 { R23_AGC21, 0x0c },
 136                 { R20_AGC11, 0x40 },
 137                 { R23_AGC21, 0x01 },
 138                 { R20_AGC11, 0x80 },
 139                 { R23_AGC21, 0x08 },
 140                 { R20_AGC11, 0xc0 },
 141                 { R23_AGC21, 0x0b },
 142                 { R24_AGC22, 0x1c },
 143                 { R24_AGC22, 0x0c },
 144         };
 145
 146         if (fe->ops.i2c_gate_ctrl)
 147                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 148
 149         /* low-pass filter cut-off frequency */
 150         if (bw <= 6000000) {
 151                 LP_Fc = 0;
 152                 priv->if_frequency = 3000000;
 153         } else if (bw <= 7000000) {
 154                 LP_Fc = 1;
 155                 priv->if_frequency = 3500000;
 156         } else {
 157                 LP_Fc = 2;
 158                 priv->if_frequency = 4000000;
 159         }
 160
 161         LO_Frac = c->frequency + priv->if_frequency;
 162
 163         /* band-pass filter */
 164         if (LO_Frac < 188000000)
 165                 BP_Filter = 3;
 166         else if (LO_Frac < 253000000)
 167                 BP_Filter = 4;
 168         else if (LO_Frac < 343000000)
 169                 BP_Filter = 5;
 170         else
 171                 BP_Filter = 6;
 172
 173         buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */
 174         buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */
 175         buf[2] = priv->regs[R1C_AGC2B];
 176         ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3);
 177         if (ret)
 178                 goto error;
 179
 180         buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */
 181         buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */
 182         buf[2] = (LO_Frac / 1000) << 4 |
 183                 (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */
 184         ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3);
 185         if (ret)
 186                 goto error;
 187
 188         buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */
 189         ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
 190         if (ret)
 191                 goto error;
 192
 193         buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */
 194         ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
 195         if (ret)
 196                 goto error;
 197
 198         /* trigger AGC */
 199         for (i = 0; i < ARRAY_SIZE(agc); i++) {
 200                 ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]);
 201                 if (ret)
 202                         goto error;
 203         }
 204
 205 error:
 206         if (fe->ops.i2c_gate_ctrl)
 207                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 208
 209         if (ret)
 210                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 211
 212         return ret;
 213 }
 214
 215 static int tda18218_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 216 {
 217         struct tda18218_priv *priv = fe->tuner_priv;
 218         *frequency = priv->if_frequency;
 219         dev_dbg(&priv->i2c->dev, "%s: if_frequency=%d\n", __func__, *frequency);
 220         return 0;
 221 }
 222
 223 static int tda18218_sleep(struct dvb_frontend *fe)
 224 {
 225         struct tda18218_priv *priv = fe->tuner_priv;
 226         int ret;
 227
 228         if (fe->ops.i2c_gate_ctrl)
 229                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 230
 231         /* standby */
 232         ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
 233
 234         if (fe->ops.i2c_gate_ctrl)
 235                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 236
 237         if (ret)
 238                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 239
 240         return ret;
 241 }
 242
 243 static int tda18218_init(struct dvb_frontend *fe)
 244 {
 245         struct tda18218_priv *priv = fe->tuner_priv;
 246         int ret;
 247
 248         /* TODO: calibrations */
 249
 250         if (fe->ops.i2c_gate_ctrl)
 251                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 252
 253         ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS);
 254
 255         if (fe->ops.i2c_gate_ctrl)
 256                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 257
 258         if (ret)
 259                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 260
 261         return ret;
 262 }
 263
 264 static void tda18218_release(struct dvb_frontend *fe)
 265 {
 266         kfree(fe->tuner_priv);
 267         fe->tuner_priv = NULL;
 268 }
 269
 270 static const struct dvb_tuner_ops tda18218_tuner_ops = {
 271         .info = {
 272                 .name              = "NXP TDA18218",
 273
 274                 .frequency_min_hz  = 174 * MHz,
 275                 .frequency_max_hz  = 864 * MHz,
 276                 .frequency_step_hz =   1 * kHz,
 277         },
 278
 279         .release       = tda18218_release,
 280         .init          = tda18218_init,
 281         .sleep         = tda18218_sleep,
 282
 283         .set_params    = tda18218_set_params,
 284
 285         .get_if_frequency = tda18218_get_if_frequency,
 286 };
 287
 288 struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe,
 289         struct i2c_adapter *i2c, struct tda18218_config *cfg)
 290 {
 291         struct tda18218_priv *priv = NULL;
 292         u8 val;
 293         int ret;
 294         /* chip default registers values */
 295         static u8 def_regs[] = {
 296                 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40,
 297                 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00,
 298                 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01,
 299                 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9,
 300                 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00,
 301                 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6
 302         };
 303
 304         priv = kzalloc(sizeof(struct tda18218_priv), GFP_KERNEL);
 305         if (priv == NULL)
 306                 return NULL;
 307
 308         priv->cfg = cfg;
 309         priv->i2c = i2c;
 310         fe->tuner_priv = priv;
 311
 312         if (fe->ops.i2c_gate_ctrl)
 313                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 314
 315         /* check if the tuner is there */
 316         ret = tda18218_rd_reg(priv, R00_ID, &val);
 317         if (!ret)
 318                 dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
 319         if (ret || val != def_regs[R00_ID]) {
 320                 kfree(priv);
 321                 return NULL;
 322         }
 323
 324         dev_info(&priv->i2c->dev,
 325                         "%s: NXP TDA18218HN successfully identified\n",
 326                         KBUILD_MODNAME);
 327
 328         memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops,
 329                 sizeof(struct dvb_tuner_ops));
 330         memcpy(priv->regs, def_regs, sizeof(def_regs));
 331
 332         /* loop-through enabled chip default register values */
 333         if (priv->cfg->loop_through) {
 334                 priv->regs[R17_PD1] = 0xb0;
 335                 priv->regs[R18_PD2] = 0x59;
 336         }
 337
 338         /* standby */
 339         ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
 340         if (ret)
 341                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 342
 343         if (fe->ops.i2c_gate_ctrl)
 344                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 345
 346         return fe;
 347 }
 348 EXPORT_SYMBOL(tda18218_attach);
 349
 350 MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver");
 351 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 352 MODULE_LICENSE("GPL");