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  *    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
  22 #include "dvb_frontend.h"
  23 #include "ec100.h"
  24
  25 struct ec100_state {
  26         struct i2c_adapter *i2c;
  27         struct dvb_frontend frontend;
  28         struct ec100_config config;
  29
  30         u16 ber;
  31 };
  32
  33 /* write single register */
  34 static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
  35 {
  36         int ret;
  37         u8 buf[2] = {reg, val};
  38         struct i2c_msg msg[1] = {
  39                 {
  40                         .addr = state->config.demod_address,
  41                         .flags = 0,
  42                         .len = sizeof(buf),
  43                         .buf = buf,
  44                 }
  45         };
  46
  47         ret = i2c_transfer(state->i2c, msg, 1);
  48         if (ret == 1) {
  49                 ret = 0;
  50         } else {
  51                 dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
  52                                 KBUILD_MODNAME, ret, reg);
  53                 ret = -EREMOTEIO;
  54         }
  55
  56         return ret;
  57 }
  58
  59 /* read single register */
  60 static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
  61 {
  62         int ret;
  63         struct i2c_msg msg[2] = {
  64                 {
  65                         .addr = state->config.demod_address,
  66                         .flags = 0,
  67                         .len = 1,
  68                         .buf = &reg
  69                 }, {
  70                         .addr = state->config.demod_address,
  71                         .flags = I2C_M_RD,
  72                         .len = 1,
  73                         .buf = val
  74                 }
  75         };
  76
  77         ret = i2c_transfer(state->i2c, msg, 2);
  78         if (ret == 2) {
  79                 ret = 0;
  80         } else {
  81                 dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
  82                                 KBUILD_MODNAME, ret, reg);
  83                 ret = -EREMOTEIO;
  84         }
  85
  86         return ret;
  87 }
  88
  89 static int ec100_set_frontend(struct dvb_frontend *fe)
  90 {
  91         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  92         struct ec100_state *state = fe->demodulator_priv;
  93         int ret;
  94         u8 tmp, tmp2;
  95
  96         dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",
  97                         __func__, c->frequency, c->bandwidth_hz);
  98
  99         /* program tuner */
 100         if (fe->ops.tuner_ops.set_params)
 101                 fe->ops.tuner_ops.set_params(fe);
 102
 103         ret = ec100_write_reg(state, 0x04, 0x06);
 104         if (ret)
 105                 goto error;
 106         ret = ec100_write_reg(state, 0x67, 0x58);
 107         if (ret)
 108                 goto error;
 109         ret = ec100_write_reg(state, 0x05, 0x18);
 110         if (ret)
 111                 goto error;
 112
 113         /* reg/bw |   6  |   7  |   8
 114            -------+------+------+------
 115            A 0x1b | 0xa1 | 0xe7 | 0x2c
 116            A 0x1c | 0x55 | 0x63 | 0x72
 117            -------+------+------+------
 118            B 0x1b | 0xb7 | 0x00 | 0x49
 119            B 0x1c | 0x55 | 0x64 | 0x72 */
 120
 121         switch (c->bandwidth_hz) {
 122         case 6000000:
 123                 tmp = 0xb7;
 124                 tmp2 = 0x55;
 125                 break;
 126         case 7000000:
 127                 tmp = 0x00;
 128                 tmp2 = 0x64;
 129                 break;
 130         case 8000000:
 131         default:
 132                 tmp = 0x49;
 133                 tmp2 = 0x72;
 134         }
 135
 136         ret = ec100_write_reg(state, 0x1b, tmp);
 137         if (ret)
 138                 goto error;
 139         ret = ec100_write_reg(state, 0x1c, tmp2);
 140         if (ret)
 141                 goto error;
 142
 143         ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
 144         if (ret)
 145                 goto error;
 146         ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
 147         if (ret)
 148                 goto error;
 149
 150         ret = ec100_write_reg(state, 0x08, 0x24);
 151         if (ret)
 152                 goto error;
 153
 154         ret = ec100_write_reg(state, 0x00, 0x00); /* go */
 155         if (ret)
 156                 goto error;
 157         ret = ec100_write_reg(state, 0x00, 0x20); /* go */
 158         if (ret)
 159                 goto error;
 160
 161         return ret;
 162 error:
 163         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 164         return ret;
 165 }
 166
 167 static int ec100_get_tune_settings(struct dvb_frontend *fe,
 168         struct dvb_frontend_tune_settings *fesettings)
 169 {
 170         fesettings->min_delay_ms = 300;
 171         fesettings->step_size = 0;
 172         fesettings->max_drift = 0;
 173
 174         return 0;
 175 }
 176
 177 static int ec100_read_status(struct dvb_frontend *fe, enum fe_status *status)
 178 {
 179         struct ec100_state *state = fe->demodulator_priv;
 180         int ret;
 181         u8 tmp;
 182         *status = 0;
 183
 184         ret = ec100_read_reg(state, 0x42, &tmp);
 185         if (ret)
 186                 goto error;
 187
 188         if (tmp & 0x80) {
 189                 /* bit7 set - have lock */
 190                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
 191                         FE_HAS_SYNC | FE_HAS_LOCK;
 192         } else {
 193                 ret = ec100_read_reg(state, 0x01, &tmp);
 194                 if (ret)
 195                         goto error;
 196
 197                 if (tmp & 0x10) {
 198                         /* bit4 set - have signal */
 199                         *status |= FE_HAS_SIGNAL;
 200                         if (!(tmp & 0x01)) {
 201                                 /* bit0 clear - have ~valid signal */
 202                                 *status |= FE_HAS_CARRIER |  FE_HAS_VITERBI;
 203                         }
 204                 }
 205         }
 206
 207         return ret;
 208 error:
 209         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 210         return ret;
 211 }
 212
 213 static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
 214 {
 215         struct ec100_state *state = fe->demodulator_priv;
 216         int ret;
 217         u8 tmp, tmp2;
 218         u16 ber2;
 219
 220         *ber = 0;
 221
 222         ret = ec100_read_reg(state, 0x65, &tmp);
 223         if (ret)
 224                 goto error;
 225         ret = ec100_read_reg(state, 0x66, &tmp2);
 226         if (ret)
 227                 goto error;
 228
 229         ber2 = (tmp2 << 8) | tmp;
 230
 231         /* if counter overflow or clear */
 232         if (ber2 < state->ber)
 233                 *ber = ber2;
 234         else
 235                 *ber = ber2 - state->ber;
 236
 237         state->ber = ber2;
 238
 239         return ret;
 240 error:
 241         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 242         return ret;
 243 }
 244
 245 static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 246 {
 247         struct ec100_state *state = fe->demodulator_priv;
 248         int ret;
 249         u8 tmp;
 250
 251         ret = ec100_read_reg(state, 0x24, &tmp);
 252         if (ret) {
 253                 *strength = 0;
 254                 goto error;
 255         }
 256
 257         *strength = ((tmp << 8) | tmp);
 258
 259         return ret;
 260 error:
 261         dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
 262         return ret;
 263 }
 264
 265 static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
 266 {
 267         *snr = 0;
 268         return 0;
 269 }
 270
 271 static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 272 {
 273         *ucblocks = 0;
 274         return 0;
 275 }
 276
 277 static void ec100_release(struct dvb_frontend *fe)
 278 {
 279         struct ec100_state *state = fe->demodulator_priv;
 280         kfree(state);
 281 }
 282
 283 static const struct dvb_frontend_ops ec100_ops;
 284
 285 struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 286         struct i2c_adapter *i2c)
 287 {
 288         int ret;
 289         struct ec100_state *state = NULL;
 290         u8 tmp;
 291
 292         /* allocate memory for the internal state */
 293         state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
 294         if (state == NULL)
 295                 goto error;
 296
 297         /* setup the state */
 298         state->i2c = i2c;
 299         memcpy(&state->config, config, sizeof(struct ec100_config));
 300
 301         /* check if the demod is there */
 302         ret = ec100_read_reg(state, 0x33, &tmp);
 303         if (ret || tmp != 0x0b)
 304                 goto error;
 305
 306         /* create dvb_frontend */
 307         memcpy(&state->frontend.ops, &ec100_ops,
 308                 sizeof(struct dvb_frontend_ops));
 309         state->frontend.demodulator_priv = state;
 310
 311         return &state->frontend;
 312 error:
 313         kfree(state);
 314         return NULL;
 315 }
 316 EXPORT_SYMBOL(ec100_attach);
 317
 318 static const struct dvb_frontend_ops ec100_ops = {
 319         .delsys = { SYS_DVBT },
 320         .info = {
 321                 .name = "E3C EC100 DVB-T",
 322                 .caps =
 323                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 324                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 325                         FE_CAN_QPSK | FE_CAN_QAM_16 |
 326                         FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 327                         FE_CAN_TRANSMISSION_MODE_AUTO |
 328                         FE_CAN_GUARD_INTERVAL_AUTO |
 329                         FE_CAN_HIERARCHY_AUTO |
 330                         FE_CAN_MUTE_TS
 331         },
 332
 333         .release = ec100_release,
 334         .set_frontend = ec100_set_frontend,
 335         .get_tune_settings = ec100_get_tune_settings,
 336         .read_status = ec100_read_status,
 337         .read_ber = ec100_read_ber,
 338         .read_signal_strength = ec100_read_signal_strength,
 339         .read_snr = ec100_read_snr,
 340         .read_ucblocks = ec100_read_ucblocks,
 341 };
 342
 343 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 344 MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
 345 MODULE_LICENSE("GPL");