drivers/media/dvb/frontends/tda8261.c

   1 /*
   2         TDA8261 8PSK/QPSK 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
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24
  25 #include "dvb_frontend.h"
  26 #include "tda8261.h"
  27
  28 struct tda8261_state {
  29         struct dvb_frontend     *fe;
  30         struct i2c_adapter      *i2c;
  31         struct tda8261_config   *config;
  32
  33         /* state cache */
  34         u32 frequency;
  35         u32 bandwidth;
  36 };
  37
  38 static int tda8261_read(struct tda8261_state *state, u8 *buf)
  39 {
  40         struct tda8261_config *config = state->config;
  41         int err = 0;
  42         struct i2c_msg msg[] = {
  43                 { .addr = config->addr, .flags = 0,       .buf = NULL, .len = 0 },
  44                 { .addr = config->addr, .flags = I2C_M_RD,.buf = buf,  .len = 1 }
  45         };
  46
  47         if ((err = i2c_transfer(state->i2c, msg, 2)) != 2)
  48                 printk("%s: read error, err=%d\n", __func__, err);
  49
  50         return err;
  51 }
  52
  53 static int tda8261_write(struct tda8261_state *state, u8 *buf)
  54 {
  55         struct tda8261_config *config = state->config;
  56         int err = 0;
  57         struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
  58
  59         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
  60                 printk("%s: read error, err=%d\n", __func__, err);
  61
  62         return err;
  63 }
  64
  65 static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
  66 {
  67         struct tda8261_state *state = fe->tuner_priv;
  68         u8 result = 0;
  69         int err = 0;
  70
  71         if ((err = tda8261_read(state, &result)) < 0) {
  72                 printk("%s: I/O Error\n", __func__);
  73                 return err;
  74         }
  75         if ((result >> 6) & 0x01) {
  76                 printk("%s: Tuner Phase Locked\n", __func__);
  77                 *status = 1;
  78         }
  79
  80         return err;
  81 }
  82
  83 static const u32 div_tab[] = { 2000, 1000,  500,  250,  125 }; /* kHz */
  84 static const u8  ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
  85
  86 static int tda8261_get_state(struct dvb_frontend *fe,
  87                              enum tuner_param param,
  88                              struct tuner_state *tstate)
  89 {
  90         struct tda8261_state *state = fe->tuner_priv;
  91         int err = 0;
  92
  93         switch (param) {
  94         case DVBFE_TUNER_FREQUENCY:
  95                 tstate->frequency = state->frequency;
  96                 break;
  97         case DVBFE_TUNER_BANDWIDTH:
  98                 tstate->bandwidth = 60000000; /* FIXME! need to calculate Bandwidth */
  99                 break;
 100         default:
 101                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
 102                 err = -EINVAL;
 103                 break;
 104         }
 105
 106         return err;
 107 }
 108
 109 static int tda8261_set_state(struct dvb_frontend *fe,
 110                              enum tuner_param param,
 111                              struct tuner_state *tstate)
 112 {
 113         struct tda8261_state *state = fe->tuner_priv;
 114         struct tda8261_config *config = state->config;
 115         u32 frequency, N, status = 0;
 116         u8 buf[4];
 117         int err = 0;
 118
 119         if (param & DVBFE_TUNER_FREQUENCY) {
 120                 /**
 121                  * N = Max VCO Frequency / Channel Spacing
 122                  * Max VCO Frequency = VCO frequency + (channel spacing - 1)
 123                  * (to account for half channel spacing on either side)
 124                  */
 125                 frequency = tstate->frequency;
 126                 N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
 127                 buf[0] = (N >> 8) & 0xff;
 128                 buf[1] = N & 0xff;
 129                 buf[2] = (0x08 << 4) | ((ref_div[config->step_size] & 0x07) << 1);
 130                 buf[3] = 0xc0;
 131                 /* Set params */
 132                 printk("%s: Frequency=%d, Sending[ %02x %02x %02x %02x ]\n",
 133                         __func__, frequency, buf[0], buf[1], buf[2], buf[3]);
 134
 135                 if ((err = tda8261_write(state, buf)) < 0) {
 136                         printk("%s: I/O Error\n", __func__);
 137                         return err;
 138                 }
 139                 /* sleep for some time */
 140                 msleep(100);
 141                 /* check status */
 142                 if ((err = tda8261_get_status(fe, &status)) < 0) {
 143                         printk("%s: I/O Error\n", __func__);
 144                         return err;
 145                 }
 146                 if (status == 1) {
 147                         printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
 148                         state->frequency = frequency; /* cache last successful */
 149                 } else {
 150                         printk("%s: No Phase lock: status=%d\n", __func__, status);
 151                 }
 152         } else {
 153                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
 154                 return -EINVAL;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int tda8261_release(struct dvb_frontend *fe)
 161 {
 162         struct tda8261_state *state = fe->tuner_priv;
 163
 164         fe->tuner_priv = NULL;
 165         kfree(state);
 166         return 0;
 167 }
 168
 169 static struct dvb_tuner_ops tda8261_ops = {
 170
 171         .info = {
 172                 .name           = "TDA8261",
 173 //              .tuner_name     = NULL,
 174                 .frequency_min  =  950000,
 175                 .frequency_max  = 2150000,
 176                 .frequency_step = 0
 177         },
 178
 179         .set_state      = tda8261_set_state,
 180         .get_state      = tda8261_get_state,
 181         .release        = tda8261_release
 182 };
 183
 184 struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
 185                                     struct tda8261_config *config,
 186                                     struct i2c_adapter *i2c)
 187 {
 188         struct tda8261_state *state = NULL;
 189
 190         if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
 191                 goto exit;
 192
 193         state->config           = config;
 194         state->i2c              = i2c;
 195         state->fe               = fe;
 196         fe->tuner_priv          = state;
 197         fe->ops.tuner_ops       = tda8261_ops;
 198
 199         fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
 200 //      fe->ops.tuner_ops.tuner_name     = &config->buf;
 201
 202 //      printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
 203 //              __func__, fe->ops.tuner_ops.tuner_name);
 204         printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
 205
 206
 207         return fe;
 208
 209 exit:
 210         kfree(state);
 211         return NULL;
 212 }
 213
 214 EXPORT_SYMBOL(tda8261_attach);
 215 MODULE_PARM_DESC(verbose, "Set verbosity level");
 216
 217 MODULE_AUTHOR("Manu Abraham");
 218 MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
 219 MODULE_LICENSE("GPL");