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_frequency(struct dvb_frontend *fe, u32 *frequency)
  70 {
  71         struct tda665x_state *state = fe->tuner_priv;
  72
  73         *frequency = state->frequency;
  74
  75         return 0;
  76 }
  77
  78 static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
  79 {
  80         struct tda665x_state *state = fe->tuner_priv;
  81         u8 result = 0;
  82         int err = 0;
  83
  84         *status = 0;
  85
  86         err = tda665x_read(state, &result);
  87         if (err < 0)
  88                 goto exit;
  89
  90         if ((result >> 6) & 0x01) {
  91                 printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
  92                 *status = 1;
  93         }
  94
  95         return err;
  96 exit:
  97         printk(KERN_ERR "%s: I/O Error\n", __func__);
  98         return err;
  99 }
 100
 101 static int tda665x_set_frequency(struct dvb_frontend *fe,
 102                                  u32 new_frequency)
 103 {
 104         struct tda665x_state *state = fe->tuner_priv;
 105         const struct tda665x_config *config = state->config;
 106         u32 frequency, status = 0;
 107         u8 buf[4];
 108         int err = 0;
 109
 110         if ((new_frequency < config->frequency_max)
 111             || (new_frequency > config->frequency_min)) {
 112                 printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n",
 113                        __func__, new_frequency);
 114                 return -EINVAL;
 115         }
 116
 117         frequency = new_frequency;
 118
 119         frequency += config->frequency_offst;
 120         frequency *= config->ref_multiplier;
 121         frequency += config->ref_divider >> 1;
 122         frequency /= config->ref_divider;
 123
 124         buf[0] = (u8) ((frequency & 0x7f00) >> 8);
 125         buf[1] = (u8) (frequency & 0x00ff) >> 0;
 126         buf[2] = 0x80 | 0x40 | 0x02;
 127         buf[3] = 0x00;
 128
 129         /* restore frequency */
 130         frequency = new_frequency;
 131
 132         if (frequency < 153000000) {
 133                 /* VHF-L */
 134                 buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
 135                 if (frequency < 68000000)
 136                         buf[3] |= 0x40; /* 83uA */
 137                 if (frequency < 1040000000)
 138                         buf[3] |= 0x60; /* 122uA */
 139                 if (frequency < 1250000000)
 140                         buf[3] |= 0x80; /* 163uA */
 141                 else
 142                         buf[3] |= 0xa0; /* 254uA */
 143         } else if (frequency < 438000000) {
 144                 /* VHF-H */
 145                 buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
 146                 if (frequency < 230000000)
 147                         buf[3] |= 0x40;
 148                 if (frequency < 300000000)
 149                         buf[3] |= 0x60;
 150                 else
 151                         buf[3] |= 0x80;
 152         } else {
 153                 /* UHF */
 154                 buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
 155                 if (frequency < 470000000)
 156                         buf[3] |= 0x60;
 157                 if (frequency < 526000000)
 158                         buf[3] |= 0x80;
 159                 else
 160                         buf[3] |= 0xa0;
 161         }
 162
 163         /* Set params */
 164         err = tda665x_write(state, buf, 5);
 165         if (err < 0)
 166                 goto exit;
 167
 168         /* sleep for some time */
 169         printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
 170         msleep(20);
 171         /* check status */
 172         err = tda665x_get_status(fe, &status);
 173         if (err < 0)
 174                 goto exit;
 175
 176         if (status == 1) {
 177                 printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n",
 178                        __func__, status);
 179                 state->frequency = frequency; /* cache successful state */
 180         } else {
 181                 printk(KERN_ERR "%s: No Phase lock: status=%d\n",
 182                        __func__, status);
 183         }
 184
 185         return 0;
 186 exit:
 187         printk(KERN_ERR "%s: I/O Error\n", __func__);
 188         return err;
 189 }
 190
 191 static int tda665x_set_params(struct dvb_frontend *fe)
 192 {
 193         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 194
 195         tda665x_set_frequency(fe, c->frequency);
 196
 197         return 0;
 198 }
 199
 200 static void tda665x_release(struct dvb_frontend *fe)
 201 {
 202         struct tda665x_state *state = fe->tuner_priv;
 203
 204         fe->tuner_priv = NULL;
 205         kfree(state);
 206 }
 207
 208 static const struct dvb_tuner_ops tda665x_ops = {
 209         .get_status     = tda665x_get_status,
 210         .set_params     = tda665x_set_params,
 211         .get_frequency  = tda665x_get_frequency,
 212         .release        = tda665x_release
 213 };
 214
 215 struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
 216                                     const struct tda665x_config *config,
 217                                     struct i2c_adapter *i2c)
 218 {
 219         struct tda665x_state *state = NULL;
 220         struct dvb_tuner_info *info;
 221
 222         state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
 223         if (!state)
 224                 return NULL;
 225
 226         state->config           = config;
 227         state->i2c              = i2c;
 228         state->fe               = fe;
 229         fe->tuner_priv          = state;
 230         fe->ops.tuner_ops       = tda665x_ops;
 231         info                     = &fe->ops.tuner_ops.info;
 232
 233         memcpy(info->name, config->name, sizeof(config->name));
 234         info->frequency_min     = config->frequency_min;
 235         info->frequency_max     = config->frequency_max;
 236         info->frequency_step    = config->frequency_offst;
 237
 238         printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
 239
 240         return fe;
 241 }
 242 EXPORT_SYMBOL(tda665x_attach);
 243
 244 MODULE_DESCRIPTION("TDA665x driver");
 245 MODULE_AUTHOR("Manu Abraham");
 246 MODULE_LICENSE("GPL");