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 #include <linux/slab.h>
  24
  25 #include "dvb_frontend.h"
  26 #include "tda665x.h"
  27
  28 struct tda665x_state {
  29         struct dvb_frontend             *fe;
  30         struct i2c_adapter              *i2c;
  31         const struct tda665x_config     *config;
  32
  33         u32 frequency;
  34         u32 bandwidth;
  35 };
  36
  37 static int tda665x_read(struct tda665x_state *state, u8 *buf)
  38 {
  39         const struct tda665x_config *config = state->config;
  40         int err = 0;
  41         struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
  42
  43         err = i2c_transfer(state->i2c, &msg, 1);
  44         if (err != 1)
  45                 goto exit;
  46
  47         return err;
  48 exit:
  49         printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
  50         return err;
  51 }
  52
  53 static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
  54 {
  55         const struct tda665x_config *config = state->config;
  56         int err = 0;
  57         struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
  58
  59         err = i2c_transfer(state->i2c, &msg, 1);
  60         if (err != 1)
  61                 goto exit;
  62
  63         return err;
  64 exit:
  65         printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
  66         return err;
  67 }
  68
  69 static int tda665x_get_state(struct dvb_frontend *fe,
  70                              enum tuner_param param,
  71                              struct tuner_state *tstate)
  72 {
  73         struct tda665x_state *state = fe->tuner_priv;
  74         int err = 0;
  75
  76         switch (param) {
  77         case DVBFE_TUNER_FREQUENCY:
  78                 tstate->frequency = state->frequency;
  79                 break;
  80         case DVBFE_TUNER_BANDWIDTH:
  81                 break;
  82         default:
  83                 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
  84                 err = -EINVAL;
  85                 break;
  86         }
  87
  88         return err;
  89 }
  90
  91 static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
  92 {
  93         struct tda665x_state *state = fe->tuner_priv;
  94         u8 result = 0;
  95         int err = 0;
  96
  97         *status = 0;
  98
  99         err = tda665x_read(state, &result);
 100         if (err < 0)
 101                 goto exit;
 102
 103         if ((result >> 6) & 0x01) {
 104                 printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
 105                 *status = 1;
 106         }
 107
 108         return err;
 109 exit:
 110         printk(KERN_ERR "%s: I/O Error\n", __func__);
 111         return err;
 112 }
 113
 114 static int tda665x_set_state(struct dvb_frontend *fe,
 115                              enum tuner_param param,
 116                              struct tuner_state *tstate)
 117 {
 118         struct tda665x_state *state = fe->tuner_priv;
 119         const struct tda665x_config *config = state->config;
 120         u32 frequency, status = 0;
 121         u8 buf[4];
 122         int err = 0;
 123
 124         if (param & DVBFE_TUNER_FREQUENCY) {
 125
 126                 frequency = tstate->frequency;
 127                 if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) {
 128                         printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
 129                         return -EINVAL;
 130                 }
 131
 132                 frequency += config->frequency_offst;
 133                 frequency *= config->ref_multiplier;
 134                 frequency += config->ref_divider >> 1;
 135                 frequency /= config->ref_divider;
 136
 137                 buf[0] = (u8) ((frequency & 0x7f00) >> 8);
 138                 buf[1] = (u8) (frequency & 0x00ff) >> 0;
 139                 buf[2] = 0x80 | 0x40 | 0x02;
 140                 buf[3] = 0x00;
 141
 142                 /* restore frequency */
 143                 frequency = tstate->frequency;
 144
 145                 if (frequency < 153000000) {
 146                         /* VHF-L */
 147                         buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
 148                         if (frequency < 68000000)
 149                                 buf[3] |= 0x40; /* 83uA */
 150                         if (frequency < 1040000000)
 151                                 buf[3] |= 0x60; /* 122uA */
 152                         if (frequency < 1250000000)
 153                                 buf[3] |= 0x80; /* 163uA */
 154                         else
 155                                 buf[3] |= 0xa0; /* 254uA */
 156                 } else if (frequency < 438000000) {
 157                         /* VHF-H */
 158                         buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
 159                         if (frequency < 230000000)
 160                                 buf[3] |= 0x40;
 161                         if (frequency < 300000000)
 162                                 buf[3] |= 0x60;
 163                         else
 164                                 buf[3] |= 0x80;
 165                 } else {
 166                         /* UHF */
 167                         buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
 168                         if (frequency < 470000000)
 169                                 buf[3] |= 0x60;
 170                         if (frequency < 526000000)
 171                                 buf[3] |= 0x80;
 172                         else
 173                                 buf[3] |= 0xa0;
 174                 }
 175
 176                 /* Set params */
 177                 err = tda665x_write(state, buf, 5);
 178                 if (err < 0)
 179                         goto exit;
 180
 181                 /* sleep for some time */
 182                 printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
 183                 msleep(20);
 184                 /* check status */
 185                 err = tda665x_get_status(fe, &status);
 186                 if (err < 0)
 187                         goto exit;
 188
 189                 if (status == 1) {
 190                         printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status);
 191                         state->frequency = frequency; /* cache successful state */
 192                 } else {
 193                         printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status);
 194                 }
 195         } else {
 196                 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
 197                 return -EINVAL;
 198         }
 199
 200         return 0;
 201 exit:
 202         printk(KERN_ERR "%s: I/O Error\n", __func__);
 203         return err;
 204 }
 205
 206 static int tda665x_release(struct dvb_frontend *fe)
 207 {
 208         struct tda665x_state *state = fe->tuner_priv;
 209
 210         fe->tuner_priv = NULL;
 211         kfree(state);
 212         return 0;
 213 }
 214
 215 static struct dvb_tuner_ops tda665x_ops = {
 216
 217         .set_state      = tda665x_set_state,
 218         .get_state      = tda665x_get_state,
 219         .get_status     = tda665x_get_status,
 220         .release        = tda665x_release
 221 };
 222
 223 struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
 224                                     const struct tda665x_config *config,
 225                                     struct i2c_adapter *i2c)
 226 {
 227         struct tda665x_state *state = NULL;
 228         struct dvb_tuner_info *info;
 229
 230         state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
 231         if (!state)
 232                 return NULL;
 233
 234         state->config           = config;
 235         state->i2c              = i2c;
 236         state->fe               = fe;
 237         fe->tuner_priv          = state;
 238         fe->ops.tuner_ops       = tda665x_ops;
 239         info                     = &fe->ops.tuner_ops.info;
 240
 241         memcpy(info->name, config->name, sizeof(config->name));
 242         info->frequency_min     = config->frequency_min;
 243         info->frequency_max     = config->frequency_max;
 244         info->frequency_step    = config->frequency_offst;
 245
 246         printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
 247
 248         return fe;
 249 }
 250 EXPORT_SYMBOL(tda665x_attach);
 251
 252 MODULE_DESCRIPTION("TDA665x driver");
 253 MODULE_AUTHOR("Manu Abraham");
 254 MODULE_LICENSE("GPL");