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         struct dvb_frontend_ops ops;
  38
  39         struct zl10353_config config;
  40 };
  41
  42 static int debug_regs = 0;
  43
  44 static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
  45 {
  46         struct zl10353_state *state = fe->demodulator_priv;
  47         u8 buf[2] = { reg, val };
  48         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
  49                                .buf = buf, .len = 2 };
  50         int err = i2c_transfer(state->i2c, &msg, 1);
  51         if (err != 1) {
  52                 printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
  53                 return err;
  54         }
  55         return 0;
  56 }
  57
  58 int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
  59 {
  60         int err, i;
  61         for (i = 0; i < ilen - 1; i++)
  62                 if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
  63                         return err;
  64
  65         return 0;
  66 }
  67
  68 static int zl10353_read_register(struct zl10353_state *state, u8 reg)
  69 {
  70         int ret;
  71         u8 b0[1] = { reg };
  72         u8 b1[1] = { 0 };
  73         struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
  74                                     .flags = 0,
  75                                     .buf = b0, .len = 1 },
  76                                   { .addr = state->config.demod_address,
  77                                     .flags = I2C_M_RD,
  78                                     .buf = b1, .len = 1 } };
  79
  80         ret = i2c_transfer(state->i2c, msg, 2);
  81
  82         if (ret != 2) {
  83                 printk("%s: readreg error (reg=%d, ret==%i)\n",
  84                        __FUNCTION__, reg, ret);
  85                 return ret;
  86         }
  87
  88         return b1[0];
  89 }
  90
  91 static void zl10353_dump_regs(struct dvb_frontend *fe)
  92 {
  93         struct zl10353_state *state = fe->demodulator_priv;
  94         char buf[52], buf2[4];
  95         int ret;
  96         u8 reg;
  97
  98         /* Dump all registers. */
  99         for (reg = 0; ; reg++) {
 100                 if (reg % 16 == 0) {
 101                         if (reg)
 102                                 printk(KERN_DEBUG "%s\n", buf);
 103                         sprintf(buf, "%02x: ", reg);
 104                 }
 105                 ret = zl10353_read_register(state, reg);
 106                 if (ret >= 0)
 107                         sprintf(buf2, "%02x ", (u8)ret);
 108                 else
 109                         strcpy(buf2, "-- ");
 110                 strcat(buf, buf2);
 111                 if (reg == 0xff)
 112                         break;
 113         }
 114         printk(KERN_DEBUG "%s\n", buf);
 115 }
 116
 117 static int zl10353_sleep(struct dvb_frontend *fe)
 118 {
 119         static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
 120
 121         zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
 122         return 0;
 123 }
 124
 125 static int zl10353_set_parameters(struct dvb_frontend *fe,
 126                                   struct dvb_frontend_parameters *param)
 127 {
 128         struct zl10353_state *state = fe->demodulator_priv;
 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, 0x62, 0x0A);
 144
 145         state->config.pll_set(fe, param, pllbuf + 1);
 146         zl10353_write(fe, pllbuf, sizeof(pllbuf));
 147
 148         zl10353_single_write(fe, 0x70, 0x01);
 149         udelay(250);
 150         zl10353_single_write(fe, 0xE4, 0x00);
 151         zl10353_single_write(fe, 0xE5, 0x2A);
 152         zl10353_single_write(fe, 0xE9, 0x02);
 153         zl10353_single_write(fe, 0xE7, 0x40);
 154         zl10353_single_write(fe, 0xE8, 0x10);
 155
 156         return 0;
 157 }
 158
 159 static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
 160 {
 161         struct zl10353_state *state = fe->demodulator_priv;
 162         int s6, s7, s8;
 163
 164         if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
 165                 return -EREMOTEIO;
 166         if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
 167                 return -EREMOTEIO;
 168         if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
 169                 return -EREMOTEIO;
 170
 171         *status = 0;
 172         if (s6 & (1 << 2))
 173                 *status |= FE_HAS_CARRIER;
 174         if (s6 & (1 << 1))
 175                 *status |= FE_HAS_VITERBI;
 176         if (s6 & (1 << 5))
 177                 *status |= FE_HAS_LOCK;
 178         if (s7 & (1 << 4))
 179                 *status |= FE_HAS_SYNC;
 180         if (s8 & (1 << 6))
 181                 *status |= FE_HAS_SIGNAL;
 182
 183         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
 184             (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
 185                 *status &= ~FE_HAS_LOCK;
 186
 187         return 0;
 188 }
 189
 190 static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
 191 {
 192         struct zl10353_state *state = fe->demodulator_priv;
 193         u8 _snr;
 194
 195         if (debug_regs)
 196                 zl10353_dump_regs(fe);
 197
 198         _snr = zl10353_read_register(state, SNR);
 199         *snr = (_snr << 8) | _snr;
 200
 201         return 0;
 202 }
 203
 204 static int zl10353_get_tune_settings(struct dvb_frontend *fe,
 205                                      struct dvb_frontend_tune_settings
 206                                          *fe_tune_settings)
 207 {
 208         fe_tune_settings->min_delay_ms = 1000;
 209         fe_tune_settings->step_size = 0;
 210         fe_tune_settings->max_drift = 0;
 211
 212         return 0;
 213 }
 214
 215 static int zl10353_init(struct dvb_frontend *fe)
 216 {
 217         struct zl10353_state *state = fe->demodulator_priv;
 218         u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
 219         int rc = 0;
 220
 221         if (debug_regs)
 222                 zl10353_dump_regs(fe);
 223
 224         /* Do a "hard" reset if not already done */
 225         if (zl10353_read_register(state, 0x50) != 0x03) {
 226                 rc = zl10353_write(fe, zl10353_reset_attach,
 227                                    sizeof(zl10353_reset_attach));
 228                 if (debug_regs)
 229                         zl10353_dump_regs(fe);
 230         }
 231
 232         return 0;
 233 }
 234
 235 static void zl10353_release(struct dvb_frontend *fe)
 236 {
 237         struct zl10353_state *state = fe->demodulator_priv;
 238
 239         kfree(state);
 240 }
 241
 242 static struct dvb_frontend_ops zl10353_ops;
 243
 244 struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
 245                                     struct i2c_adapter *i2c)
 246 {
 247         struct zl10353_state *state = NULL;
 248
 249         /* allocate memory for the internal state */
 250         state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
 251         if (state == NULL)
 252                 goto error;
 253
 254         /* setup the state */
 255         state->i2c = i2c;
 256         memcpy(&state->config, config, sizeof(struct zl10353_config));
 257         memcpy(&state->ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
 258
 259         /* check if the demod is there */
 260         if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
 261                 goto error;
 262
 263         /* create dvb_frontend */
 264         state->frontend.ops = &state->ops;
 265         state->frontend.demodulator_priv = state;
 266
 267         return &state->frontend;
 268 error:
 269         kfree(state);
 270         return NULL;
 271 }
 272
 273 static struct dvb_frontend_ops zl10353_ops = {
 274
 275         .info = {
 276                 .name                   = "Zarlink ZL10353 DVB-T",
 277                 .type                   = FE_OFDM,
 278                 .frequency_min          = 174000000,
 279                 .frequency_max          = 862000000,
 280                 .frequency_stepsize     = 166667,
 281                 .frequency_tolerance    = 0,
 282                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 283                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 284                         FE_CAN_FEC_AUTO |
 285                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 286                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 287                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 288                         FE_CAN_MUTE_TS
 289         },
 290
 291         .release = zl10353_release,
 292
 293         .init = zl10353_init,
 294         .sleep = zl10353_sleep,
 295
 296         .set_frontend = zl10353_set_parameters,
 297         .get_tune_settings = zl10353_get_tune_settings,
 298
 299         .read_status = zl10353_read_status,
 300         .read_snr = zl10353_read_snr,
 301 };
 302
 303 module_param(debug_regs, int, 0644);
 304 MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
 305
 306 MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
 307 MODULE_AUTHOR("Chris Pascoe");
 308 MODULE_LICENSE("GPL");
 309
 310 EXPORT_SYMBOL(zl10353_attach);
 311 EXPORT_SYMBOL(zl10353_write);