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_priv.h"
  24 #include "ec100.h"
  25
  26 int ec100_debug;
  27 module_param_named(debug, ec100_debug, int, 0644);
  28 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  29
  30 struct ec100_state {
  31         struct i2c_adapter *i2c;
  32         struct dvb_frontend frontend;
  33         struct ec100_config config;
  34
  35         u16 ber;
  36 };
  37
  38 /* write single register */
  39 static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
  40 {
  41         u8 buf[2] = {reg, val};
  42         struct i2c_msg msg = {
  43                 .addr = state->config.demod_address,
  44                 .flags = 0,
  45                 .len = 2,
  46                 .buf = buf};
  47
  48         if (i2c_transfer(state->i2c, &msg, 1) != 1) {
  49                 warn("I2C write failed reg:%02x", reg);
  50                 return -EREMOTEIO;
  51         }
  52         return 0;
  53 }
  54
  55 /* read single register */
  56 static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
  57 {
  58         struct i2c_msg msg[2] = {
  59                 {
  60                         .addr = state->config.demod_address,
  61                         .flags = 0,
  62                         .len = 1,
  63                         .buf = &reg
  64                 }, {
  65                         .addr = state->config.demod_address,
  66                         .flags = I2C_M_RD,
  67                         .len = 1,
  68                         .buf = val
  69                 }
  70         };
  71
  72         if (i2c_transfer(state->i2c, msg, 2) != 2) {
  73                 warn("I2C read failed reg:%02x", reg);
  74                 return -EREMOTEIO;
  75         }
  76         return 0;
  77 }
  78
  79 static int ec100_set_frontend(struct dvb_frontend *fe,
  80         struct dvb_frontend_parameters *params)
  81 {
  82         struct ec100_state *state = fe->demodulator_priv;
  83         int ret;
  84         u8 tmp, tmp2;
  85
  86         deb_info("%s: freq:%d bw:%d\n", __func__, params->frequency,
  87                 params->u.ofdm.bandwidth);
  88
  89         /* program tuner */
  90         if (fe->ops.tuner_ops.set_params)
  91                 fe->ops.tuner_ops.set_params(fe, params);
  92
  93         ret = ec100_write_reg(state, 0x04, 0x06);
  94         if (ret)
  95                 goto error;
  96         ret = ec100_write_reg(state, 0x67, 0x58);
  97         if (ret)
  98                 goto error;
  99         ret = ec100_write_reg(state, 0x05, 0x18);
 100         if (ret)
 101                 goto error;
 102
 103         /* reg/bw |   6  |   7  |   8
 104            -------+------+------+------
 105            A 0x1b | 0xa1 | 0xe7 | 0x2c
 106            A 0x1c | 0x55 | 0x63 | 0x72
 107            -------+------+------+------
 108            B 0x1b | 0xb7 | 0x00 | 0x49
 109            B 0x1c | 0x55 | 0x64 | 0x72 */
 110
 111         switch (params->u.ofdm.bandwidth) {
 112         case BANDWIDTH_6_MHZ:
 113                 tmp = 0xb7;
 114                 tmp2 = 0x55;
 115                 break;
 116         case BANDWIDTH_7_MHZ:
 117                 tmp = 0x00;
 118                 tmp2 = 0x64;
 119                 break;
 120         case BANDWIDTH_8_MHZ:
 121         default:
 122                 tmp = 0x49;
 123                 tmp2 = 0x72;
 124         }
 125
 126         ret = ec100_write_reg(state, 0x1b, tmp);
 127         if (ret)
 128                 goto error;
 129         ret = ec100_write_reg(state, 0x1c, tmp2);
 130         if (ret)
 131                 goto error;
 132
 133         ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
 134         if (ret)
 135                 goto error;
 136         ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
 137         if (ret)
 138                 goto error;
 139
 140         ret = ec100_write_reg(state, 0x08, 0x24);
 141         if (ret)
 142                 goto error;
 143
 144         ret = ec100_write_reg(state, 0x00, 0x00); /* go */
 145         if (ret)
 146                 goto error;
 147         ret = ec100_write_reg(state, 0x00, 0x20); /* go */
 148         if (ret)
 149                 goto error;
 150
 151         return ret;
 152 error:
 153         deb_info("%s: failed:%d\n", __func__, ret);
 154         return ret;
 155 }
 156
 157 static int ec100_get_tune_settings(struct dvb_frontend *fe,
 158         struct dvb_frontend_tune_settings *fesettings)
 159 {
 160         fesettings->min_delay_ms = 300;
 161         fesettings->step_size = 0;
 162         fesettings->max_drift = 0;
 163
 164         return 0;
 165 }
 166
 167 static int ec100_read_status(struct dvb_frontend *fe, fe_status_t *status)
 168 {
 169         struct ec100_state *state = fe->demodulator_priv;
 170         int ret;
 171         u8 tmp;
 172         *status = 0;
 173
 174         ret = ec100_read_reg(state, 0x42, &tmp);
 175         if (ret)
 176                 goto error;
 177
 178         if (tmp & 0x80) {
 179                 /* bit7 set - have lock */
 180                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
 181                         FE_HAS_SYNC | FE_HAS_LOCK;
 182         } else {
 183                 ret = ec100_read_reg(state, 0x01, &tmp);
 184                 if (ret)
 185                         goto error;
 186
 187                 if (tmp & 0x10) {
 188                         /* bit4 set - have signal */
 189                         *status |= FE_HAS_SIGNAL;
 190                         if (!(tmp & 0x01)) {
 191                                 /* bit0 clear - have ~valid signal */
 192                                 *status |= FE_HAS_CARRIER |  FE_HAS_VITERBI;
 193                         }
 194                 }
 195         }
 196
 197         return ret;
 198 error:
 199         deb_info("%s: failed:%d\n", __func__, ret);
 200         return ret;
 201 }
 202
 203 static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
 204 {
 205         struct ec100_state *state = fe->demodulator_priv;
 206         int ret;
 207         u8 tmp, tmp2;
 208         u16 ber2;
 209
 210         *ber = 0;
 211
 212         ret = ec100_read_reg(state, 0x65, &tmp);
 213         if (ret)
 214                 goto error;
 215         ret = ec100_read_reg(state, 0x66, &tmp2);
 216         if (ret)
 217                 goto error;
 218
 219         ber2 = (tmp2 << 8) | tmp;
 220
 221         /* if counter overflow or clear */
 222         if (ber2 < state->ber)
 223                 *ber = ber2;
 224         else
 225                 *ber = ber2 - state->ber;
 226
 227         state->ber = ber2;
 228
 229         return ret;
 230 error:
 231         deb_info("%s: failed:%d\n", __func__, ret);
 232         return ret;
 233 }
 234
 235 static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 236 {
 237         struct ec100_state *state = fe->demodulator_priv;
 238         int ret;
 239         u8 tmp;
 240
 241         ret = ec100_read_reg(state, 0x24, &tmp);
 242         if (ret) {
 243                 *strength = 0;
 244                 goto error;
 245         }
 246
 247         *strength = ((tmp << 8) | tmp);
 248
 249         return ret;
 250 error:
 251         deb_info("%s: failed:%d\n", __func__, ret);
 252         return ret;
 253 }
 254
 255 static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
 256 {
 257         *snr = 0;
 258         return 0;
 259 }
 260
 261 static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 262 {
 263         *ucblocks = 0;
 264         return 0;
 265 }
 266
 267 static void ec100_release(struct dvb_frontend *fe)
 268 {
 269         struct ec100_state *state = fe->demodulator_priv;
 270         kfree(state);
 271 }
 272
 273 static struct dvb_frontend_ops ec100_ops;
 274
 275 struct dvb_frontend *ec100_attach(const struct ec100_config *config,
 276         struct i2c_adapter *i2c)
 277 {
 278         int ret;
 279         struct ec100_state *state = NULL;
 280         u8 tmp;
 281
 282         /* allocate memory for the internal state */
 283         state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
 284         if (state == NULL)
 285                 goto error;
 286
 287         /* setup the state */
 288         state->i2c = i2c;
 289         memcpy(&state->config, config, sizeof(struct ec100_config));
 290
 291         /* check if the demod is there */
 292         ret = ec100_read_reg(state, 0x33, &tmp);
 293         if (ret || tmp != 0x0b)
 294                 goto error;
 295
 296         /* create dvb_frontend */
 297         memcpy(&state->frontend.ops, &ec100_ops,
 298                 sizeof(struct dvb_frontend_ops));
 299         state->frontend.demodulator_priv = state;
 300
 301         return &state->frontend;
 302 error:
 303         kfree(state);
 304         return NULL;
 305 }
 306 EXPORT_SYMBOL(ec100_attach);
 307
 308 static struct dvb_frontend_ops ec100_ops = {
 309         .info = {
 310                 .name = "E3C EC100 DVB-T",
 311                 .type = FE_OFDM,
 312                 .caps =
 313                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 314                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 315                         FE_CAN_QPSK | FE_CAN_QAM_16 |
 316                         FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 317                         FE_CAN_TRANSMISSION_MODE_AUTO |
 318                         FE_CAN_GUARD_INTERVAL_AUTO |
 319                         FE_CAN_HIERARCHY_AUTO |
 320                         FE_CAN_MUTE_TS
 321         },
 322
 323         .release = ec100_release,
 324         .set_frontend = ec100_set_frontend,
 325         .get_tune_settings = ec100_get_tune_settings,
 326         .read_status = ec100_read_status,
 327         .read_ber = ec100_read_ber,
 328         .read_signal_strength = ec100_read_signal_strength,
 329         .read_snr = ec100_read_snr,
 330         .read_ucblocks = ec100_read_ucblocks,
 331 };
 332
 333 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 334 MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
 335 MODULE_LICENSE("GPL");