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  *    You should have received a copy of the GNU General Public License
  17  *    along with this program; if not, write to the Free Software
  18  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "tda18218_priv.h"
  22
  23 /* write multiple registers */
  24 static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
  25 {
  26         int ret = 0, len2, remaining;
  27         u8 buf[1 + len];
  28         struct i2c_msg msg[1] = {
  29                 {
  30                         .addr = priv->cfg->i2c_address,
  31                         .flags = 0,
  32                         .buf = buf,
  33                 }
  34         };
  35
  36         for (remaining = len; remaining > 0;
  37                         remaining -= (priv->cfg->i2c_wr_max - 1)) {
  38                 len2 = remaining;
  39                 if (len2 > (priv->cfg->i2c_wr_max - 1))
  40                         len2 = (priv->cfg->i2c_wr_max - 1);
  41
  42                 msg[0].len = 1 + len2;
  43                 buf[0] = reg + len - remaining;
  44                 memcpy(&buf[1], &val[len - remaining], len2);
  45
  46                 ret = i2c_transfer(priv->i2c, msg, 1);
  47                 if (ret != 1)
  48                         break;
  49         }
  50
  51         if (ret == 1) {
  52                 ret = 0;
  53         } else {
  54                 dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
  55                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  56                 ret = -EREMOTEIO;
  57         }
  58
  59         return ret;
  60 }
  61
  62 /* read multiple registers */
  63 static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
  64 {
  65         int ret;
  66         u8 buf[reg+len]; /* we must start read always from reg 0x00 */
  67         struct i2c_msg msg[2] = {
  68                 {
  69                         .addr = priv->cfg->i2c_address,
  70                         .flags = 0,
  71                         .len = 1,
  72                         .buf = "\x00",
  73                 }, {
  74                         .addr = priv->cfg->i2c_address,
  75                         .flags = I2C_M_RD,
  76                         .len = sizeof(buf),
  77                         .buf = buf,
  78                 }
  79         };
  80
  81         ret = i2c_transfer(priv->i2c, msg, 2);
  82         if (ret == 2) {
  83                 memcpy(val, &buf[reg], len);
  84                 ret = 0;
  85         } else {
  86                 dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
  87                                 "len=%d\n", KBUILD_MODNAME, ret, reg, len);
  88                 ret = -EREMOTEIO;
  89         }
  90
  91         return ret;
  92 }
  93
  94 /* write single register */
  95 static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val)
  96 {
  97         return tda18218_wr_regs(priv, reg, &val, 1);
  98 }
  99
 100 /* read single register */
 101
 102 static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val)
 103 {
 104         return tda18218_rd_regs(priv, reg, val, 1);
 105 }
 106
 107 static int tda18218_set_params(struct dvb_frontend *fe)
 108 {
 109         struct tda18218_priv *priv = fe->tuner_priv;
 110         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 111         u32 bw = c->bandwidth_hz;
 112         int ret;
 113         u8 buf[3], i, BP_Filter, LP_Fc;
 114         u32 LO_Frac;
 115         /* TODO: find out correct AGC algorithm */
 116         u8 agc[][2] = {
 117                 { R20_AGC11, 0x60 },
 118                 { R23_AGC21, 0x02 },
 119                 { R20_AGC11, 0xa0 },
 120                 { R23_AGC21, 0x09 },
 121                 { R20_AGC11, 0xe0 },
 122                 { R23_AGC21, 0x0c },
 123                 { R20_AGC11, 0x40 },
 124                 { R23_AGC21, 0x01 },
 125                 { R20_AGC11, 0x80 },
 126                 { R23_AGC21, 0x08 },
 127                 { R20_AGC11, 0xc0 },
 128                 { R23_AGC21, 0x0b },
 129                 { R24_AGC22, 0x1c },
 130                 { R24_AGC22, 0x0c },
 131         };
 132
 133         if (fe->ops.i2c_gate_ctrl)
 134                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 135
 136         /* low-pass filter cut-off frequency */
 137         if (bw <= 6000000) {
 138                 LP_Fc = 0;
 139                 priv->if_frequency = 3000000;
 140         } else if (bw <= 7000000) {
 141                 LP_Fc = 1;
 142                 priv->if_frequency = 3500000;
 143         } else {
 144                 LP_Fc = 2;
 145                 priv->if_frequency = 4000000;
 146         }
 147
 148         LO_Frac = c->frequency + priv->if_frequency;
 149
 150         /* band-pass filter */
 151         if (LO_Frac < 188000000)
 152                 BP_Filter = 3;
 153         else if (LO_Frac < 253000000)
 154                 BP_Filter = 4;
 155         else if (LO_Frac < 343000000)
 156                 BP_Filter = 5;
 157         else
 158                 BP_Filter = 6;
 159
 160         buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */
 161         buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */
 162         buf[2] = priv->regs[R1C_AGC2B];
 163         ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3);
 164         if (ret)
 165                 goto error;
 166
 167         buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */
 168         buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */
 169         buf[2] = (LO_Frac / 1000) << 4 |
 170                 (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */
 171         ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3);
 172         if (ret)
 173                 goto error;
 174
 175         buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */
 176         ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
 177         if (ret)
 178                 goto error;
 179
 180         buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */
 181         ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
 182         if (ret)
 183                 goto error;
 184
 185         /* trigger AGC */
 186         for (i = 0; i < ARRAY_SIZE(agc); i++) {
 187                 ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]);
 188                 if (ret)
 189                         goto error;
 190         }
 191
 192 error:
 193         if (fe->ops.i2c_gate_ctrl)
 194                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 195
 196         if (ret)
 197                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 198
 199         return ret;
 200 }
 201
 202 static int tda18218_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 203 {
 204         struct tda18218_priv *priv = fe->tuner_priv;
 205         *frequency = priv->if_frequency;
 206         dev_dbg(&priv->i2c->dev, "%s: if_frequency=%d\n", __func__, *frequency);
 207         return 0;
 208 }
 209
 210 static int tda18218_sleep(struct dvb_frontend *fe)
 211 {
 212         struct tda18218_priv *priv = fe->tuner_priv;
 213         int ret;
 214
 215         if (fe->ops.i2c_gate_ctrl)
 216                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 217
 218         /* standby */
 219         ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
 220
 221         if (fe->ops.i2c_gate_ctrl)
 222                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 223
 224         if (ret)
 225                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 226
 227         return ret;
 228 }
 229
 230 static int tda18218_init(struct dvb_frontend *fe)
 231 {
 232         struct tda18218_priv *priv = fe->tuner_priv;
 233         int ret;
 234
 235         /* TODO: calibrations */
 236
 237         if (fe->ops.i2c_gate_ctrl)
 238                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 239
 240         ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS);
 241
 242         if (fe->ops.i2c_gate_ctrl)
 243                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 244
 245         if (ret)
 246                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 247
 248         return ret;
 249 }
 250
 251 static int tda18218_release(struct dvb_frontend *fe)
 252 {
 253         kfree(fe->tuner_priv);
 254         fe->tuner_priv = NULL;
 255         return 0;
 256 }
 257
 258 static const struct dvb_tuner_ops tda18218_tuner_ops = {
 259         .info = {
 260                 .name           = "NXP TDA18218",
 261
 262                 .frequency_min  = 174000000,
 263                 .frequency_max  = 864000000,
 264                 .frequency_step =      1000,
 265         },
 266
 267         .release       = tda18218_release,
 268         .init          = tda18218_init,
 269         .sleep         = tda18218_sleep,
 270
 271         .set_params    = tda18218_set_params,
 272
 273         .get_if_frequency = tda18218_get_if_frequency,
 274 };
 275
 276 struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe,
 277         struct i2c_adapter *i2c, struct tda18218_config *cfg)
 278 {
 279         struct tda18218_priv *priv = NULL;
 280         u8 val;
 281         int ret;
 282         /* chip default registers values */
 283         static u8 def_regs[] = {
 284                 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40,
 285                 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00,
 286                 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01,
 287                 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9,
 288                 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00,
 289                 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6
 290         };
 291
 292         priv = kzalloc(sizeof(struct tda18218_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 = tda18218_rd_reg(priv, R00_ID, &val);
 305         if (!ret)
 306                 dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
 307         if (ret || val != def_regs[R00_ID]) {
 308                 kfree(priv);
 309                 return NULL;
 310         }
 311
 312         dev_info(&priv->i2c->dev,
 313                         "%s: NXP TDA18218HN successfully identified\n",
 314                         KBUILD_MODNAME);
 315
 316         memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops,
 317                 sizeof(struct dvb_tuner_ops));
 318         memcpy(priv->regs, def_regs, sizeof(def_regs));
 319
 320         /* loop-through enabled chip default register values */
 321         if (priv->cfg->loop_through) {
 322                 priv->regs[R17_PD1] = 0xb0;
 323                 priv->regs[R18_PD2] = 0x59;
 324         }
 325
 326         /* standby */
 327         ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
 328         if (ret)
 329                 dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 330
 331         if (fe->ops.i2c_gate_ctrl)
 332                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 333
 334         return fe;
 335 }
 336 EXPORT_SYMBOL(tda18218_attach);
 337
 338 MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver");
 339 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 340 MODULE_LICENSE("GPL");