drivers/media/dvb/frontends/tda665x.c

   1 /*
   2         TDA665x tuner driver
   3         Copyright (C) Manu Abraham (abraham.manu@gmail.com)
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the Free Software
  17         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23
  24 #include "dvb_frontend.h"
  25 #include "tda665x.h"
  26
  27 struct tda665x_state {
  28         struct dvb_frontend             *fe;
  29         struct i2c_adapter              *i2c;
  30         const struct tda665x_config     *config;
  31
  32         u32 frequency;
  33         u32 bandwidth;
  34 };
  35
  36 static int tda665x_read(struct tda665x_state *state, u8 *buf)
  37 {
  38         const struct tda665x_config *config = state->config;
  39         int err = 0;
  40         struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
  41
  42         err = i2c_transfer(state->i2c, &msg, 1);
  43         if (err != 1)
  44                 goto exit;
  45
  46         return err;
  47 exit:
  48         printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
  49         return err;
  50 }
  51
  52 static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
  53 {
  54         const struct tda665x_config *config = state->config;
  55         int err = 0;
  56         struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
  57
  58         err = i2c_transfer(state->i2c, &msg, 1);
  59         if (err != 1)
  60                 goto exit;
  61
  62         return err;
  63 exit:
  64         printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
  65         return err;
  66 }
  67
  68 static int tda665x_get_state(struct dvb_frontend *fe,
  69                              enum tuner_param param,
  70                              struct tuner_state *tstate)
  71 {
  72         struct tda665x_state *state = fe->tuner_priv;
  73         int err = 0;
  74
  75         switch (param) {
  76         case DVBFE_TUNER_FREQUENCY:
  77                 tstate->frequency = state->frequency;
  78                 break;
  79         case DVBFE_TUNER_BANDWIDTH:
  80                 break;
  81         default:
  82                 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
  83                 err = -EINVAL;
  84                 break;
  85         }
  86
  87         return err;
  88 }
  89
  90 static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
  91 {
  92         struct tda665x_state *state = fe->tuner_priv;
  93         u8 result = 0;
  94         int err = 0;
  95
  96         *status = 0;
  97
  98         err = tda665x_read(state, &result);
  99         if (err < 0)
 100                 goto exit;
 101
 102         if ((result >> 6) & 0x01) {
 103                 printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
 104                 *status = 1;
 105         }
 106
 107         return err;
 108 exit:
 109         printk(KERN_ERR "%s: I/O Error\n", __func__);
 110         return err;
 111 }
 112
 113 static int tda665x_set_state(struct dvb_frontend *fe,
 114                              enum tuner_param param,
 115                              struct tuner_state *tstate)
 116 {
 117         struct tda665x_state *state = fe->tuner_priv;
 118         const struct tda665x_config *config = state->config;
 119         u32 frequency, status = 0;
 120         u8 buf[4];
 121         int err = 0;
 122
 123         if (param & DVBFE_TUNER_FREQUENCY) {
 124
 125                 frequency = tstate->frequency;
 126                 if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) {
 127                         printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
 128                         return -EINVAL;
 129                 }
 130
 131                 frequency += config->frequency_offst;
 132                 frequency *= config->ref_multiplier;
 133                 frequency += config->ref_divider >> 1;
 134                 frequency /= config->ref_divider;
 135
 136                 buf[0] = (u8) ((frequency & 0x7f00) >> 8);
 137                 buf[1] = (u8) (frequency & 0x00ff) >> 0;
 138                 buf[2] = 0x80 | 0x40 | 0x02;
 139                 buf[3] = 0x00;
 140
 141                 /* restore frequency */
 142                 frequency = tstate->frequency;
 143
 144                 if (frequency < 153000000) {
 145                         /* VHF-L */
 146                         buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
 147                         if (frequency < 68000000)
 148                                 buf[3] |= 0x40; /* 83uA */
 149                         if (frequency < 1040000000)
 150                                 buf[3] |= 0x60; /* 122uA */
 151                         if (frequency < 1250000000)
 152                                 buf[3] |= 0x80; /* 163uA */
 153                         else
 154                                 buf[3] |= 0xa0; /* 254uA */
 155                 } else if (frequency < 438000000) {
 156                         /* VHF-H */
 157                         buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
 158                         if (frequency < 230000000)
 159                                 buf[3] |= 0x40;
 160                         if (frequency < 300000000)
 161                                 buf[3] |= 0x60;
 162                         else
 163                                 buf[3] |= 0x80;
 164                 } else {
 165                         /* UHF */
 166                         buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
 167                         if (frequency < 470000000)
 168                                 buf[3] |= 0x60;
 169                         if (frequency < 526000000)
 170                                 buf[3] |= 0x80;
 171                         else
 172                                 buf[3] |= 0xa0;
 173                 }
 174
 175                 /* Set params */
 176                 err = tda665x_write(state, buf, 5);
 177                 if (err < 0)
 178                         goto exit;
 179
 180                 /* sleep for some time */
 181                 printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
 182                 msleep(20);
 183                 /* check status */
 184                 err = tda665x_get_status(fe, &status);
 185                 if (err < 0)
 186                         goto exit;
 187
 188                 if (status == 1) {
 189                         printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status);
 190                         state->frequency = frequency; /* cache successful state */
 191                 } else {
 192                         printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status);
 193                 }
 194         } else {
 195                 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
 196                 return -EINVAL;
 197         }
 198
 199         return 0;
 200 exit:
 201         printk(KERN_ERR "%s: I/O Error\n", __func__);
 202         return err;
 203 }
 204
 205 static int tda665x_release(struct dvb_frontend *fe)
 206 {
 207         struct tda665x_state *state = fe->tuner_priv;
 208
 209         fe->tuner_priv = NULL;
 210         kfree(state);
 211         return 0;
 212 }
 213
 214 static struct dvb_tuner_ops tda665x_ops = {
 215
 216         .set_state      = tda665x_set_state,
 217         .get_state      = tda665x_get_state,
 218         .get_status     = tda665x_get_status,
 219         .release        = tda665x_release
 220 };
 221
 222 struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
 223                                     const struct tda665x_config *config,
 224                                     struct i2c_adapter *i2c)
 225 {
 226         struct tda665x_state *state = NULL;
 227         struct dvb_tuner_info *info;
 228
 229         state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
 230         if (state == NULL)
 231                 goto exit;
 232
 233         state->config           = config;
 234         state->i2c              = i2c;
 235         state->fe               = fe;
 236         fe->tuner_priv          = state;
 237         fe->ops.tuner_ops       = tda665x_ops;
 238         info                     = &fe->ops.tuner_ops.info;
 239
 240         memcpy(info->name, config->name, sizeof(config->name));
 241         info->frequency_min     = config->frequency_min;
 242         info->frequency_max     = config->frequency_max;
 243         info->frequency_step    = config->frequency_offst;
 244
 245         printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
 246
 247         return fe;
 248
 249 exit:
 250         kfree(state);
 251         return NULL;
 252 }
 253 EXPORT_SYMBOL(tda665x_attach);
 254
 255 MODULE_DESCRIPTION("TDA665x driver");
 256 MODULE_AUTHOR("Manu Abraham");
 257 MODULE_LICENSE("GPL");