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         const 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         const struct tda8261_config *config = state->config;
  41         int err = 0;
  42         struct i2c_msg msg = { .addr    = config->addr, .flags = I2C_M_RD,.buf = buf,  .len = 2 };
  43
  44         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
  45                 printk("%s: read error, err=%d\n", __func__, err);
  46
  47         return err;
  48 }
  49
  50 static int tda8261_write(struct tda8261_state *state, u8 *buf)
  51 {
  52         const struct tda8261_config *config = state->config;
  53         int err = 0;
  54         struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
  55
  56         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
  57                 printk("%s: write error, err=%d\n", __func__, err);
  58
  59         return err;
  60 }
  61
  62 static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
  63 {
  64         struct tda8261_state *state = fe->tuner_priv;
  65         u8 result = 0;
  66         int err = 0;
  67
  68         *status = 0;
  69
  70         if ((err = tda8261_read(state, &result)) < 0) {
  71                 printk("%s: I/O Error\n", __func__);
  72                 return err;
  73         }
  74         if ((result >> 6) & 0x01) {
  75                 printk("%s: Tuner Phase Locked\n", __func__);
  76                 *status = 1;
  77         }
  78
  79         return err;
  80 }
  81
  82 static const u32 div_tab[] = { 2000, 1000,  500,  250,  125 }; /* kHz */
  83 static const u8  ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
  84
  85 static int tda8261_get_state(struct dvb_frontend *fe,
  86                              enum tuner_param param,
  87                              struct tuner_state *tstate)
  88 {
  89         struct tda8261_state *state = fe->tuner_priv;
  90         int err = 0;
  91
  92         switch (param) {
  93         case DVBFE_TUNER_FREQUENCY:
  94                 tstate->frequency = state->frequency;
  95                 break;
  96         case DVBFE_TUNER_BANDWIDTH:
  97                 tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */
  98                 break;
  99         default:
 100                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
 101                 err = -EINVAL;
 102                 break;
 103         }
 104
 105         return err;
 106 }
 107
 108 static int tda8261_set_state(struct dvb_frontend *fe,
 109                              enum tuner_param param,
 110                              struct tuner_state *tstate)
 111 {
 112         struct tda8261_state *state = fe->tuner_priv;
 113         const struct tda8261_config *config = state->config;
 114         u32 frequency, N, status = 0;
 115         u8 buf[4];
 116         int err = 0;
 117
 118         if (param & DVBFE_TUNER_FREQUENCY) {
 119                 /**
 120                  * N = Max VCO Frequency / Channel Spacing
 121                  * Max VCO Frequency = VCO frequency + (channel spacing - 1)
 122                  * (to account for half channel spacing on either side)
 123                  */
 124                 frequency = tstate->frequency;
 125                 if ((frequency < 950000) || (frequency > 2150000)) {
 126                         printk("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
 127                         return -EINVAL;
 128                 }
 129                 N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
 130                 printk("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
 131                         __func__, config->step_size, div_tab[config->step_size], N, N);
 132
 133                 buf[0] = (N >> 8) & 0xff;
 134                 buf[1] = N & 0xff;
 135                 buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
 136
 137                 if (frequency < 1450000)
 138                         buf[3] = 0x00;
 139                 if (frequency < 2000000)
 140                         buf[3] = 0x40;
 141                 if (frequency < 2150000)
 142                         buf[3] = 0x80;
 143
 144                 /* Set params */
 145                 if ((err = tda8261_write(state, buf)) < 0) {
 146                         printk("%s: I/O Error\n", __func__);
 147                         return err;
 148                 }
 149                 /* sleep for some time */
 150                 printk("%s: Waiting to Phase LOCK\n", __func__);
 151                 msleep(20);
 152                 /* check status */
 153                 if ((err = tda8261_get_status(fe, &status)) < 0) {
 154                         printk("%s: I/O Error\n", __func__);
 155                         return err;
 156                 }
 157                 if (status == 1) {
 158                         printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
 159                         state->frequency = frequency; /* cache successful state */
 160                 } else {
 161                         printk("%s: No Phase lock: status=%d\n", __func__, status);
 162                 }
 163         } else {
 164                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
 165                 return -EINVAL;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int tda8261_release(struct dvb_frontend *fe)
 172 {
 173         struct tda8261_state *state = fe->tuner_priv;
 174
 175         fe->tuner_priv = NULL;
 176         kfree(state);
 177         return 0;
 178 }
 179
 180 static struct dvb_tuner_ops tda8261_ops = {
 181
 182         .info = {
 183                 .name           = "TDA8261",
 184 //              .tuner_name     = NULL,
 185                 .frequency_min  =  950000,
 186                 .frequency_max  = 2150000,
 187                 .frequency_step = 0
 188         },
 189
 190         .set_state      = tda8261_set_state,
 191         .get_state      = tda8261_get_state,
 192         .get_status     = tda8261_get_status,
 193         .release        = tda8261_release
 194 };
 195
 196 struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
 197                                     const struct tda8261_config *config,
 198                                     struct i2c_adapter *i2c)
 199 {
 200         struct tda8261_state *state = NULL;
 201
 202         if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
 203                 goto exit;
 204
 205         state->config           = config;
 206         state->i2c              = i2c;
 207         state->fe               = fe;
 208         fe->tuner_priv          = state;
 209         fe->ops.tuner_ops       = tda8261_ops;
 210
 211         fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
 212 //      fe->ops.tuner_ops.tuner_name     = &config->buf;
 213
 214 //      printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
 215 //              __func__, fe->ops.tuner_ops.tuner_name);
 216         printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
 217
 218         return fe;
 219
 220 exit:
 221         kfree(state);
 222         return NULL;
 223 }
 224
 225 EXPORT_SYMBOL(tda8261_attach);
 226 MODULE_PARM_DESC(verbose, "Set verbosity level");
 227
 228 MODULE_AUTHOR("Manu Abraham");
 229 MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
 230 MODULE_LICENSE("GPL");