drivers/media/dvb/frontends/zl10353.c

   1 /*
   2  * Driver for Zarlink DVB-T ZL10353 demodulator
   3  *
   4  * Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
   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  *
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29
  30 #include "dvb_frontend.h"
  31 #include "zl10353_priv.h"
  32 #include "zl10353.h"
  33
  34 struct zl10353_state {
  35         struct i2c_adapter *i2c;
  36         struct dvb_frontend frontend;
  37
  38         struct zl10353_config config;
  39 };
  40
  41 static int debug_regs = 0;
  42
  43 static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
  44 {
  45         struct zl10353_state *state = fe->demodulator_priv;
  46         u8 buf[2] = { reg, val };
  47         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
  48                                .buf = buf, .len = 2 };
  49         int err = i2c_transfer(state->i2c, &msg, 1);
  50         if (err != 1) {
  51                 printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
  52                 return err;
  53         }
  54         return 0;
  55 }
  56
  57 int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
  58 {
  59         int err, i;
  60         for (i = 0; i < ilen - 1; i++)
  61                 if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
  62                         return err;
  63
  64         return 0;
  65 }
  66
  67 static int zl10353_read_register(struct zl10353_state *state, u8 reg)
  68 {
  69         int ret;
  70         u8 b0[1] = { reg };
  71         u8 b1[1] = { 0 };
  72         struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
  73                                     .flags = 0,
  74                                     .buf = b0, .len = 1 },
  75                                   { .addr = state->config.demod_address,
  76                                     .flags = I2C_M_RD,
  77                                     .buf = b1, .len = 1 } };
  78
  79         ret = i2c_transfer(state->i2c, msg, 2);
  80
  81         if (ret != 2) {
  82                 printk("%s: readreg error (reg=%d, ret==%i)\n",
  83                        __FUNCTION__, reg, ret);
  84                 return ret;
  85         }
  86
  87         return b1[0];
  88 }
  89
  90 static void zl10353_dump_regs(struct dvb_frontend *fe)
  91 {
  92         struct zl10353_state *state = fe->demodulator_priv;
  93         char buf[52], buf2[4];
  94         int ret;
  95         u8 reg;
  96
  97         /* Dump all registers. */
  98         for (reg = 0; ; reg++) {
  99                 if (reg % 16 == 0) {
 100                         if (reg)
 101                                 printk(KERN_DEBUG "%s\n", buf);
 102                         sprintf(buf, "%02x: ", reg);
 103                 }
 104                 ret = zl10353_read_register(state, reg);
 105                 if (ret >= 0)
 106                         sprintf(buf2, "%02x ", (u8)ret);
 107                 else
 108                         strcpy(buf2, "-- ");
 109                 strcat(buf, buf2);
 110                 if (reg == 0xff)
 111                         break;
 112         }
 113         printk(KERN_DEBUG "%s\n", buf);
 114 }
 115
 116 static int zl10353_sleep(struct dvb_frontend *fe)
 117 {
 118         static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
 119
 120         zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
 121         return 0;
 122 }
 123
 124 static int zl10353_set_parameters(struct dvb_frontend *fe,
 125                                   struct dvb_frontend_parameters *param)
 126 {
 127         struct zl10353_state *state = fe->demodulator_priv;
 128
 129         u8 pllbuf[6] = { 0x67 };
 130
 131         /* These settings set "auto-everything" and start the FSM. */
 132         zl10353_single_write(fe, 0x55, 0x80);
 133         udelay(200);
 134         zl10353_single_write(fe, 0xEA, 0x01);
 135         udelay(200);
 136         zl10353_single_write(fe, 0xEA, 0x00);
 137
 138         zl10353_single_write(fe, 0x56, 0x28);
 139         zl10353_single_write(fe, 0x89, 0x20);
 140         zl10353_single_write(fe, 0x5E, 0x00);
 141         zl10353_single_write(fe, 0x65, 0x5A);
 142         zl10353_single_write(fe, 0x66, 0xE9);
 143         zl10353_single_write(fe, 0x6C, 0xCD);
 144         zl10353_single_write(fe, 0x6D, 0x7E);
 145         zl10353_single_write(fe, 0x62, 0x0A);
 146
 147         // if there is no attached secondary tuner, we call set_params to program
 148         // a potential tuner attached somewhere else
 149         if (state->config.no_tuner) {
 150                 if (fe->ops.tuner_ops.set_params) {
 151                         fe->ops.tuner_ops.set_params(fe, param);
 152                         if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 153                 }
 154         }
 155
 156         // if pllbuf is defined, retrieve the settings
 157         if (fe->ops.tuner_ops.calc_regs) {
 158                 fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
 159                 pllbuf[1] <<= 1;
 160         } else {
 161                 // fake pllbuf settings
 162                 pllbuf[1] = 0x61 << 1;
 163                 pllbuf[2] = 0;
 164                 pllbuf[3] = 0;
 165                 pllbuf[3] = 0;
 166                 pllbuf[4] = 0;
 167         }
 168
 169         // there is no call to _just_ start decoding, so we send the pllbuf anyway
 170         // even if there isn't a PLL attached to the secondary bus
 171         zl10353_write(fe, pllbuf, sizeof(pllbuf));
 172
 173         zl10353_single_write(fe, 0x5F, 0x13);
 174         zl10353_single_write(fe, 0x70, 0x01);
 175         udelay(250);
 176         zl10353_single_write(fe, 0xE4, 0x00);
 177         zl10353_single_write(fe, 0xE5, 0x2A);
 178         zl10353_single_write(fe, 0xE9, 0x02);
 179         zl10353_single_write(fe, 0xE7, 0x40);
 180         zl10353_single_write(fe, 0xE8, 0x10);
 181
 182         return 0;
 183 }
 184
 185 static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
 186 {
 187         struct zl10353_state *state = fe->demodulator_priv;
 188         int s6, s7, s8;
 189
 190         if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
 191                 return -EREMOTEIO;
 192         if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
 193                 return -EREMOTEIO;
 194         if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
 195                 return -EREMOTEIO;
 196
 197         *status = 0;
 198         if (s6 & (1 << 2))
 199                 *status |= FE_HAS_CARRIER;
 200         if (s6 & (1 << 1))
 201                 *status |= FE_HAS_VITERBI;
 202         if (s6 & (1 << 5))
 203                 *status |= FE_HAS_LOCK;
 204         if (s7 & (1 << 4))
 205                 *status |= FE_HAS_SYNC;
 206         if (s8 & (1 << 6))
 207                 *status |= FE_HAS_SIGNAL;
 208
 209         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
 210             (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
 211                 *status &= ~FE_HAS_LOCK;
 212
 213         return 0;
 214 }
 215
 216 static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
 217 {
 218         struct zl10353_state *state = fe->demodulator_priv;
 219         u8 _snr;
 220
 221         if (debug_regs)
 222                 zl10353_dump_regs(fe);
 223
 224         _snr = zl10353_read_register(state, SNR);
 225         *snr = (_snr << 8) | _snr;
 226
 227         return 0;
 228 }
 229
 230 static int zl10353_get_tune_settings(struct dvb_frontend *fe,
 231                                      struct dvb_frontend_tune_settings
 232                                          *fe_tune_settings)
 233 {
 234         fe_tune_settings->min_delay_ms = 1000;
 235         fe_tune_settings->step_size = 0;
 236         fe_tune_settings->max_drift = 0;
 237
 238         return 0;
 239 }
 240
 241 static int zl10353_init(struct dvb_frontend *fe)
 242 {
 243         struct zl10353_state *state = fe->demodulator_priv;
 244         u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
 245         int rc = 0;
 246
 247         if (debug_regs)
 248                 zl10353_dump_regs(fe);
 249         if (state->config.parallel_ts)
 250                 zl10353_reset_attach[2] &= ~0x20;
 251
 252         /* Do a "hard" reset if not already done */
 253         if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
 254             zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
 255                 rc = zl10353_write(fe, zl10353_reset_attach,
 256                                    sizeof(zl10353_reset_attach));
 257                 if (debug_regs)
 258                         zl10353_dump_regs(fe);
 259         }
 260
 261         return 0;
 262 }
 263
 264 static void zl10353_release(struct dvb_frontend *fe)
 265 {
 266         struct zl10353_state *state = fe->demodulator_priv;
 267         kfree(state);
 268 }
 269
 270 static struct dvb_frontend_ops zl10353_ops;
 271
 272 struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
 273                                     struct i2c_adapter *i2c)
 274 {
 275         struct zl10353_state *state = NULL;
 276
 277         /* allocate memory for the internal state */
 278         state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
 279         if (state == NULL)
 280                 goto error;
 281
 282         /* setup the state */
 283         state->i2c = i2c;
 284         memcpy(&state->config, config, sizeof(struct zl10353_config));
 285
 286         /* check if the demod is there */
 287         if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
 288                 goto error;
 289
 290         /* create dvb_frontend */
 291         memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
 292         state->frontend.demodulator_priv = state;
 293
 294         return &state->frontend;
 295 error:
 296         kfree(state);
 297         return NULL;
 298 }
 299
 300 static struct dvb_frontend_ops zl10353_ops = {
 301
 302         .info = {
 303                 .name                   = "Zarlink ZL10353 DVB-T",
 304                 .type                   = FE_OFDM,
 305                 .frequency_min          = 174000000,
 306                 .frequency_max          = 862000000,
 307                 .frequency_stepsize     = 166667,
 308                 .frequency_tolerance    = 0,
 309                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 310                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 311                         FE_CAN_FEC_AUTO |
 312                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 313                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 314                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 315                         FE_CAN_MUTE_TS
 316         },
 317
 318         .release = zl10353_release,
 319
 320         .init = zl10353_init,
 321         .sleep = zl10353_sleep,
 322         .write = zl10353_write,
 323
 324         .set_frontend = zl10353_set_parameters,
 325         .get_tune_settings = zl10353_get_tune_settings,
 326
 327         .read_status = zl10353_read_status,
 328         .read_snr = zl10353_read_snr,
 329 };
 330
 331 module_param(debug_regs, int, 0644);
 332 MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
 333
 334 MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
 335 MODULE_AUTHOR("Chris Pascoe");
 336 MODULE_LICENSE("GPL");
 337
 338 EXPORT_SYMBOL(zl10353_attach);