linux/drivers/media/common/tuners/mt2131.c
<<
>>
Prefs
   1/*
   2 *  Driver for Microtune MT2131 "QAM/8VSB single chip tuner"
   3 *
   4 *  Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22#include <linux/module.h>
  23#include <linux/delay.h>
  24#include <linux/dvb/frontend.h>
  25#include <linux/i2c.h>
  26#include <linux/slab.h>
  27
  28#include "dvb_frontend.h"
  29
  30#include "mt2131.h"
  31#include "mt2131_priv.h"
  32
  33static int debug;
  34module_param(debug, int, 0644);
  35MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  36
  37#define dprintk(level,fmt, arg...) if (debug >= level) \
  38        printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)
  39
  40static u8 mt2131_config1[] = {
  41        0x01,
  42        0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,
  43        0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
  44        0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,
  45        0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00
  46};
  47
  48static u8 mt2131_config2[] = {
  49        0x10,
  50        0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
  51};
  52
  53static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)
  54{
  55        struct i2c_msg msg[2] = {
  56                { .addr = priv->cfg->i2c_address, .flags = 0,
  57                  .buf = &reg, .len = 1 },
  58                { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  59                  .buf = val,  .len = 1 },
  60        };
  61
  62        if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  63                printk(KERN_WARNING "mt2131 I2C read failed\n");
  64                return -EREMOTEIO;
  65        }
  66        return 0;
  67}
  68
  69static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)
  70{
  71        u8 buf[2] = { reg, val };
  72        struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0,
  73                               .buf = buf, .len = 2 };
  74
  75        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  76                printk(KERN_WARNING "mt2131 I2C write failed\n");
  77                return -EREMOTEIO;
  78        }
  79        return 0;
  80}
  81
  82static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
  83{
  84        struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
  85                               .flags = 0, .buf = buf, .len = len };
  86
  87        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  88                printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",
  89                       (int)len);
  90                return -EREMOTEIO;
  91        }
  92        return 0;
  93}
  94
  95static int mt2131_set_params(struct dvb_frontend *fe,
  96                             struct dvb_frontend_parameters *params)
  97{
  98        struct mt2131_priv *priv;
  99        int ret=0, i;
 100        u32 freq;
 101        u8  if_band_center;
 102        u32 f_lo1, f_lo2;
 103        u32 div1, num1, div2, num2;
 104        u8  b[8];
 105        u8 lockval = 0;
 106
 107        priv = fe->tuner_priv;
 108        if (fe->ops.info.type == FE_OFDM)
 109                priv->bandwidth = params->u.ofdm.bandwidth;
 110        else
 111                priv->bandwidth = 0;
 112
 113        freq = params->frequency / 1000;  // Hz -> kHz
 114        dprintk(1, "%s() freq=%d\n", __func__, freq);
 115
 116        f_lo1 = freq + MT2131_IF1 * 1000;
 117        f_lo1 = (f_lo1 / 250) * 250;
 118        f_lo2 = f_lo1 - freq - MT2131_IF2;
 119
 120        priv->frequency =  (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
 121
 122        /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
 123        num1 = f_lo1 * 64 / (MT2131_FREF / 128);
 124        div1 = num1 / 8192;
 125        num1 &= 0x1fff;
 126
 127        /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
 128        num2 = f_lo2 * 64 / (MT2131_FREF / 128);
 129        div2 = num2 / 8192;
 130        num2 &= 0x1fff;
 131
 132        if (freq <=   82500) if_band_center = 0x00; else
 133        if (freq <=  137500) if_band_center = 0x01; else
 134        if (freq <=  192500) if_band_center = 0x02; else
 135        if (freq <=  247500) if_band_center = 0x03; else
 136        if (freq <=  302500) if_band_center = 0x04; else
 137        if (freq <=  357500) if_band_center = 0x05; else
 138        if (freq <=  412500) if_band_center = 0x06; else
 139        if (freq <=  467500) if_band_center = 0x07; else
 140        if (freq <=  522500) if_band_center = 0x08; else
 141        if (freq <=  577500) if_band_center = 0x09; else
 142        if (freq <=  632500) if_band_center = 0x0A; else
 143        if (freq <=  687500) if_band_center = 0x0B; else
 144        if (freq <=  742500) if_band_center = 0x0C; else
 145        if (freq <=  797500) if_band_center = 0x0D; else
 146        if (freq <=  852500) if_band_center = 0x0E; else
 147        if (freq <=  907500) if_band_center = 0x0F; else
 148        if (freq <=  962500) if_band_center = 0x10; else
 149        if (freq <= 1017500) if_band_center = 0x11; else
 150        if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
 151
 152        b[0] = 1;
 153        b[1] = (num1 >> 5) & 0xFF;
 154        b[2] = (num1 & 0x1F);
 155        b[3] = div1;
 156        b[4] = (num2 >> 5) & 0xFF;
 157        b[5] = num2 & 0x1F;
 158        b[6] = div2;
 159
 160        dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
 161        dprintk(1, "PLL freq=%dkHz  band=%d\n", (int)freq, (int)if_band_center);
 162        dprintk(1, "PLL f_lo1=%dkHz  f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
 163        dprintk(1, "PLL div1=%d  num1=%d  div2=%d  num2=%d\n",
 164                (int)div1, (int)num1, (int)div2, (int)num2);
 165        dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
 166                (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
 167                (int)b[6]);
 168
 169        ret = mt2131_writeregs(priv,b,7);
 170        if (ret < 0)
 171                return ret;
 172
 173        mt2131_writereg(priv, 0x0b, if_band_center);
 174
 175        /* Wait for lock */
 176        i = 0;
 177        do {
 178                mt2131_readreg(priv, 0x08, &lockval);
 179                if ((lockval & 0x88) == 0x88)
 180                        break;
 181                msleep(4);
 182                i++;
 183        } while (i < 10);
 184
 185        return ret;
 186}
 187
 188static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 189{
 190        struct mt2131_priv *priv = fe->tuner_priv;
 191        dprintk(1, "%s()\n", __func__);
 192        *frequency = priv->frequency;
 193        return 0;
 194}
 195
 196static int mt2131_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 197{
 198        struct mt2131_priv *priv = fe->tuner_priv;
 199        dprintk(1, "%s()\n", __func__);
 200        *bandwidth = priv->bandwidth;
 201        return 0;
 202}
 203
 204static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
 205{
 206        struct mt2131_priv *priv = fe->tuner_priv;
 207        u8 lock_status = 0;
 208        u8 afc_status = 0;
 209
 210        *status = 0;
 211
 212        mt2131_readreg(priv, 0x08, &lock_status);
 213        if ((lock_status & 0x88) == 0x88)
 214                *status = TUNER_STATUS_LOCKED;
 215
 216        mt2131_readreg(priv, 0x09, &afc_status);
 217        dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
 218                __func__, lock_status, afc_status);
 219
 220        return 0;
 221}
 222
 223static int mt2131_init(struct dvb_frontend *fe)
 224{
 225        struct mt2131_priv *priv = fe->tuner_priv;
 226        int ret;
 227        dprintk(1, "%s()\n", __func__);
 228
 229        if ((ret = mt2131_writeregs(priv, mt2131_config1,
 230                                    sizeof(mt2131_config1))) < 0)
 231                return ret;
 232
 233        mt2131_writereg(priv, 0x0b, 0x09);
 234        mt2131_writereg(priv, 0x15, 0x47);
 235        mt2131_writereg(priv, 0x07, 0xf2);
 236        mt2131_writereg(priv, 0x0b, 0x01);
 237
 238        if ((ret = mt2131_writeregs(priv, mt2131_config2,
 239                                    sizeof(mt2131_config2))) < 0)
 240                return ret;
 241
 242        return ret;
 243}
 244
 245static int mt2131_release(struct dvb_frontend *fe)
 246{
 247        dprintk(1, "%s()\n", __func__);
 248        kfree(fe->tuner_priv);
 249        fe->tuner_priv = NULL;
 250        return 0;
 251}
 252
 253static const struct dvb_tuner_ops mt2131_tuner_ops = {
 254        .info = {
 255                .name           = "Microtune MT2131",
 256                .frequency_min  =  48000000,
 257                .frequency_max  = 860000000,
 258                .frequency_step =     50000,
 259        },
 260
 261        .release       = mt2131_release,
 262        .init          = mt2131_init,
 263
 264        .set_params    = mt2131_set_params,
 265        .get_frequency = mt2131_get_frequency,
 266        .get_bandwidth = mt2131_get_bandwidth,
 267        .get_status    = mt2131_get_status
 268};
 269
 270struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
 271                                    struct i2c_adapter *i2c,
 272                                    struct mt2131_config *cfg, u16 if1)
 273{
 274        struct mt2131_priv *priv = NULL;
 275        u8 id = 0;
 276
 277        dprintk(1, "%s()\n", __func__);
 278
 279        priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
 280        if (priv == NULL)
 281                return NULL;
 282
 283        priv->cfg = cfg;
 284        priv->bandwidth = 6000000; /* 6MHz */
 285        priv->i2c = i2c;
 286
 287        if (mt2131_readreg(priv, 0, &id) != 0) {
 288                kfree(priv);
 289                return NULL;
 290        }
 291        if ( (id != 0x3E) && (id != 0x3F) ) {
 292                printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
 293                       cfg->i2c_address);
 294                kfree(priv);
 295                return NULL;
 296        }
 297
 298        printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
 299               cfg->i2c_address);
 300        memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
 301               sizeof(struct dvb_tuner_ops));
 302
 303        fe->tuner_priv = priv;
 304        return fe;
 305}
 306EXPORT_SYMBOL(mt2131_attach);
 307
 308MODULE_AUTHOR("Steven Toth");
 309MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
 310MODULE_LICENSE("GPL");
 311
 312/*
 313 * Local variables:
 314 * c-basic-offset: 8
 315 */
 316