drivers/media/dvb-frontends/ec100.c

   1 /*
   2  * E3C EC100 demodulator driver
   3  *
   4  * Copyright (C) 2009 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
  18 #include <media/dvb_frontend.h>
  19 #include "ec100.h"
  20
  21 struct ec100_state {
  22         struct i2c_adapter *i2c;
  23         struct dvb_frontend frontend;
  24         struct ec100_config config;
  25
  26         u16 ber;
  27 };
  28
  29 /* write single register */
  30 static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
  31 {
  32         int ret;
  33         u8 buf[2] = {reg, val};
  34         struct i2c_msg msg[1] = {
  35                 {
  36                         .addr = state->config.demod_address,
  37                         .flags = 0,
  38                         .len = sizeof(buf),
  39                         .buf = buf,
  40                 }
  41         };
  42
  43         ret = i2c_transfer(state->i2c, msg, 1);
  44         if (ret == 1) {
  45                 ret = 0;
  46         } else {
  47                 dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
  48                                 KBUILD_MODNAME, ret, reg);
  49                 ret = -EREMOTEIO;
  50         }
  51
  52         return ret;
  53 }
  54
  55 /* read single register */
  56 static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
  57 {
  58         int ret;
  59         struct i2c_msg msg[2] = {
  60                 {
  61                         .addr = state->config.demod_address,
  62                         .flags = 0,
  63                         .len = 1,
  64                         .buf = &reg
  65                 }, {
  66                         .addr = state->config.demod_address,
  67                         .flags = I2C_M_RD,
  68                         .len = 1,
  69                         .buf = val
  70                 }
  71         };
  72
  73         ret = i2c_transfer(state->i2c, msg, 2);
  74         if (ret == 2) {
  75                 ret = 0;
  76         } else {
  77                 dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
  78                                 KBUILD_MODNAME, ret, reg);
  79                 ret = -EREMOTEIO;
  80         }
  81
  82         return ret;
  83 }
  84
  85 static int ec100_set_frontend(struct dvb_frontend *fe)
  86 {
  87         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  88         struct ec100_state *state = fe->demodulator_priv;
  89         int ret;
  90         u8 tmp, tmp2;
  91
  92         dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",
  93                         __func__, c->frequency, c->bandwidth_hz);
  94
  95         /* program tuner */
  96         if (fe->ops.tuner_ops.set_params)
  97                 fe->ops.tuner_ops.set_params(fe);
  98
  99         ret = ec100_write_reg(state, 0x04, 0x06);
 100         if (ret)
 101                 goto error;
 102         ret = ec100_write_reg(state, 0x67, 0x58);
 103         if (ret)
 104                 goto error;
 105         ret = ec100_write_reg(state, 0x05, 0x18);
 106         if (ret)
 107                 goto error;
 108
 109         /* reg/bw |   6  |   7  |   8
 110            -------+------+------+------
 111            A 0x1b | 0xa1 | 0xe7 | 0x2c
 112            A 0x1c | 0x55 | 0x63 | 0x72
 113            -------+------+------+------
 114            B 0x1b | 0xb7 | 0x00 | 0x49
 115            B 0x1c | 0x55 | 0x64 | 0x72 */
 116
 117         switch (c->bandwidth_hz) {
 118         case 6000000:
 119                 tmp = 0xb7;
 120                 tmp2 = 0x55;
 121                 break;
 122         case 7000000:
 123                 tmp = 0x00;
 124                 tmp2 = 0x64;
 125                 break;
 126         case 8000000:
 127         default:
 128                 tmp = 0x49;
 129                 tmp2 = 0x72;
 130         }
 131
 132         ret = ec100_write_reg(state, 0x1b, tmp);
 133         if (ret)
 134                 goto error;
 135         ret = ec100_write_reg(state, 0x1c, tmp2);
 136         if (ret)
 137                 goto error;
 138
 139         ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
 140         if (ret)
 141                 goto error;
 142         ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
 143         if (ret)
 144                 goto error;
 145
 146         ret = ec100_write_reg(state, 0x08, 0x24);
 147         if (ret)
 148                 goto error;
 149
 150         ret = ec100_write_reg(state, 0x00, 0x00); /* go */
 151         if (ret)
 152                 goto error;
 153         ret = ec100_write_reg(state, 0x00, 0x20); /* go */
 154         if (ret)
 155                 goto error;
 156
 157         return ret;
 158 error:
 159         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 160         return ret;
 161 }
 162
 163 static int ec100_get_tune_settings(struct dvb_frontend *fe,
 164         struct dvb_frontend_tune_settings *fesettings)
 165 {
 166         fesettings->min_delay_ms = 300;
 167         fesettings->step_size = 0;
 168         fesettings->max_drift = 0;
 169
 170         return 0;
 171 }
 172
 173 static int ec100_read_status(struct dvb_frontend *fe, enum fe_status *status)
 174 {
 175         struct ec100_state *state = fe->demodulator_priv;
 176         int ret;
 177         u8 tmp;
 178         *status = 0;
 179
 180         ret = ec100_read_reg(state, 0x42, &tmp);
 181         if (ret)
 182                 goto error;
 183
 184         if (tmp & 0x80) {
 185                 /* bit7 set - have lock */
 186                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
 187                         FE_HAS_SYNC | FE_HAS_LOCK;
 188         } else {
 189                 ret = ec100_read_reg(state, 0x01, &tmp);
 190                 if (ret)
 191                         goto error;
 192
 193                 if (tmp & 0x10) {
 194                         /* bit4 set - have signal */
 195                         *status |= FE_HAS_SIGNAL;
 196                         if (!(tmp & 0x01)) {
 197                                 /* bit0 clear - have ~valid signal */
 198                                 *status |= FE_HAS_CARRIER |  FE_HAS_VITERBI;
 199                         }
 200                 }
 201         }
 202
 203         return ret;
 204 error:
 205         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 206         return ret;
 207 }
 208
 209 static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
 210 {
 211         struct ec100_state *state = fe->demodulator_priv;
 212         int ret;
 213         u8 tmp, tmp2;
 214         u16 ber2;
 215
 216         *ber = 0;
 217
 218         ret = ec100_read_reg(state, 0x65, &tmp);
 219         if (ret)
 220                 goto error;
 221         ret = ec100_read_reg(state, 0x66, &tmp2);
 222         if (ret)
 223                 goto error;
 224
 225         ber2 = (tmp2 << 8) | tmp;
 226
 227         /* if counter overflow or clear */
 228         if (ber2 < state->ber)
 229                 *ber = ber2;
 230         else
 231                 *ber = ber2 - state->ber;
 232
 233         state->ber = ber2;
 234
 235         return ret;
 236 error:
 237         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 238         return ret;
 239 }
 240
 241 static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 242 {
 243         struct ec100_state *state = fe->demodulator_priv;
 244         int ret;
 245         u8 tmp;
 246
 247         ret = ec100_read_reg(state, 0x24, &tmp);
 248         if (ret) {
 249                 *strength = 0;
 250                 goto error;
 251         }
 252
 253         *strength = ((tmp << 8) | tmp);
 254
 255         return ret;
 256 error:
 257         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 258         return ret;
 259 }
 260
 261 static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
 262 {
 263         *snr = 0;
 264         return 0;
 265 }
 266
 267 static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 268 {
 269         *ucblocks = 0;
 270         return 0;
 271 }
 272
 273 static void ec100_release(struct dvb_frontend *fe)
 274 {
 275         struct ec100_state *state = fe->demodulator_priv;
 276         kfree(state);
 277 }
 278
 279 static const struct dvb_frontend_ops ec100_ops;
 280
 281 struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 282         struct i2c_adapter *i2c)
 283 {
 284         int ret;
 285         struct ec100_state *state = NULL;
 286         u8 tmp;
 287
 288         /* allocate memory for the internal state */
 289         state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
 290         if (state == NULL)
 291                 goto error;
 292
 293         /* setup the state */
 294         state->i2c = i2c;
 295         memcpy(&state->config, config, sizeof(struct ec100_config));
 296
 297         /* check if the demod is there */
 298         ret = ec100_read_reg(state, 0x33, &tmp);
 299         if (ret || tmp != 0x0b)
 300                 goto error;
 301
 302         /* create dvb_frontend */
 303         memcpy(&state->frontend.ops, &ec100_ops,
 304                 sizeof(struct dvb_frontend_ops));
 305         state->frontend.demodulator_priv = state;
 306
 307         return &state->frontend;
 308 error:
 309         kfree(state);
 310         return NULL;
 311 }
 312 EXPORT_SYMBOL(ec100_attach);
 313
 314 static const struct dvb_frontend_ops ec100_ops = {
 315         .delsys = { SYS_DVBT },
 316         .info = {
 317                 .name = "E3C EC100 DVB-T",
 318                 .caps =
 319                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 320                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 321                         FE_CAN_QPSK | FE_CAN_QAM_16 |
 322                         FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 323                         FE_CAN_TRANSMISSION_MODE_AUTO |
 324                         FE_CAN_GUARD_INTERVAL_AUTO |
 325                         FE_CAN_HIERARCHY_AUTO |
 326                         FE_CAN_MUTE_TS
 327         },
 328
 329         .release = ec100_release,
 330         .set_frontend = ec100_set_frontend,
 331         .get_tune_settings = ec100_get_tune_settings,
 332         .read_status = ec100_read_status,
 333         .read_ber = ec100_read_ber,
 334         .read_signal_strength = ec100_read_signal_strength,
 335         .read_snr = ec100_read_snr,
 336         .read_ucblocks = ec100_read_ucblocks,
 337 };
 338
 339 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 340 MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
 341 MODULE_LICENSE("GPL");