linux/drivers/media/tuners/mt2131.c
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   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{
  97        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  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
 109        freq = c->frequency / 1000;  /* Hz -> kHz */
 110        dprintk(1, "%s() freq=%d\n", __func__, freq);
 111
 112        f_lo1 = freq + MT2131_IF1 * 1000;
 113        f_lo1 = (f_lo1 / 250) * 250;
 114        f_lo2 = f_lo1 - freq - MT2131_IF2;
 115
 116        priv->frequency =  (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
 117
 118        /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
 119        num1 = f_lo1 * 64 / (MT2131_FREF / 128);
 120        div1 = num1 / 8192;
 121        num1 &= 0x1fff;
 122
 123        /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
 124        num2 = f_lo2 * 64 / (MT2131_FREF / 128);
 125        div2 = num2 / 8192;
 126        num2 &= 0x1fff;
 127
 128        if (freq <=   82500) if_band_center = 0x00; else
 129        if (freq <=  137500) if_band_center = 0x01; else
 130        if (freq <=  192500) if_band_center = 0x02; else
 131        if (freq <=  247500) if_band_center = 0x03; else
 132        if (freq <=  302500) if_band_center = 0x04; else
 133        if (freq <=  357500) if_band_center = 0x05; else
 134        if (freq <=  412500) if_band_center = 0x06; else
 135        if (freq <=  467500) if_band_center = 0x07; else
 136        if (freq <=  522500) if_band_center = 0x08; else
 137        if (freq <=  577500) if_band_center = 0x09; else
 138        if (freq <=  632500) if_band_center = 0x0A; else
 139        if (freq <=  687500) if_band_center = 0x0B; else
 140        if (freq <=  742500) if_band_center = 0x0C; else
 141        if (freq <=  797500) if_band_center = 0x0D; else
 142        if (freq <=  852500) if_band_center = 0x0E; else
 143        if (freq <=  907500) if_band_center = 0x0F; else
 144        if (freq <=  962500) if_band_center = 0x10; else
 145        if (freq <= 1017500) if_band_center = 0x11; else
 146        if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
 147
 148        b[0] = 1;
 149        b[1] = (num1 >> 5) & 0xFF;
 150        b[2] = (num1 & 0x1F);
 151        b[3] = div1;
 152        b[4] = (num2 >> 5) & 0xFF;
 153        b[5] = num2 & 0x1F;
 154        b[6] = div2;
 155
 156        dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
 157        dprintk(1, "PLL freq=%dkHz  band=%d\n", (int)freq, (int)if_band_center);
 158        dprintk(1, "PLL f_lo1=%dkHz  f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
 159        dprintk(1, "PLL div1=%d  num1=%d  div2=%d  num2=%d\n",
 160                (int)div1, (int)num1, (int)div2, (int)num2);
 161        dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
 162                (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
 163                (int)b[6]);
 164
 165        ret = mt2131_writeregs(priv,b,7);
 166        if (ret < 0)
 167                return ret;
 168
 169        mt2131_writereg(priv, 0x0b, if_band_center);
 170
 171        /* Wait for lock */
 172        i = 0;
 173        do {
 174                mt2131_readreg(priv, 0x08, &lockval);
 175                if ((lockval & 0x88) == 0x88)
 176                        break;
 177                msleep(4);
 178                i++;
 179        } while (i < 10);
 180
 181        return ret;
 182}
 183
 184static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 185{
 186        struct mt2131_priv *priv = fe->tuner_priv;
 187        dprintk(1, "%s()\n", __func__);
 188        *frequency = priv->frequency;
 189        return 0;
 190}
 191
 192static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
 193{
 194        struct mt2131_priv *priv = fe->tuner_priv;
 195        u8 lock_status = 0;
 196        u8 afc_status = 0;
 197
 198        *status = 0;
 199
 200        mt2131_readreg(priv, 0x08, &lock_status);
 201        if ((lock_status & 0x88) == 0x88)
 202                *status = TUNER_STATUS_LOCKED;
 203
 204        mt2131_readreg(priv, 0x09, &afc_status);
 205        dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
 206                __func__, lock_status, afc_status);
 207
 208        return 0;
 209}
 210
 211static int mt2131_init(struct dvb_frontend *fe)
 212{
 213        struct mt2131_priv *priv = fe->tuner_priv;
 214        int ret;
 215        dprintk(1, "%s()\n", __func__);
 216
 217        if ((ret = mt2131_writeregs(priv, mt2131_config1,
 218                                    sizeof(mt2131_config1))) < 0)
 219                return ret;
 220
 221        mt2131_writereg(priv, 0x0b, 0x09);
 222        mt2131_writereg(priv, 0x15, 0x47);
 223        mt2131_writereg(priv, 0x07, 0xf2);
 224        mt2131_writereg(priv, 0x0b, 0x01);
 225
 226        if ((ret = mt2131_writeregs(priv, mt2131_config2,
 227                                    sizeof(mt2131_config2))) < 0)
 228                return ret;
 229
 230        return ret;
 231}
 232
 233static int mt2131_release(struct dvb_frontend *fe)
 234{
 235        dprintk(1, "%s()\n", __func__);
 236        kfree(fe->tuner_priv);
 237        fe->tuner_priv = NULL;
 238        return 0;
 239}
 240
 241static const struct dvb_tuner_ops mt2131_tuner_ops = {
 242        .info = {
 243                .name           = "Microtune MT2131",
 244                .frequency_min  =  48000000,
 245                .frequency_max  = 860000000,
 246                .frequency_step =     50000,
 247        },
 248
 249        .release       = mt2131_release,
 250        .init          = mt2131_init,
 251
 252        .set_params    = mt2131_set_params,
 253        .get_frequency = mt2131_get_frequency,
 254        .get_status    = mt2131_get_status
 255};
 256
 257struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
 258                                    struct i2c_adapter *i2c,
 259                                    struct mt2131_config *cfg, u16 if1)
 260{
 261        struct mt2131_priv *priv = NULL;
 262        u8 id = 0;
 263
 264        dprintk(1, "%s()\n", __func__);
 265
 266        priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
 267        if (priv == NULL)
 268                return NULL;
 269
 270        priv->cfg = cfg;
 271        priv->i2c = i2c;
 272
 273        if (mt2131_readreg(priv, 0, &id) != 0) {
 274                kfree(priv);
 275                return NULL;
 276        }
 277        if ( (id != 0x3E) && (id != 0x3F) ) {
 278                printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
 279                       cfg->i2c_address);
 280                kfree(priv);
 281                return NULL;
 282        }
 283
 284        printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
 285               cfg->i2c_address);
 286        memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
 287               sizeof(struct dvb_tuner_ops));
 288
 289        fe->tuner_priv = priv;
 290        return fe;
 291}
 292EXPORT_SYMBOL(mt2131_attach);
 293
 294MODULE_AUTHOR("Steven Toth");
 295MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
 296MODULE_LICENSE("GPL");
 297
 298/*
 299 * Local variables:
 300 * c-basic-offset: 8
 301 */
 302