drivers/media/tuners/mt2131.c

   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
  18 #include <linux/module.h>
  19 #include <linux/delay.h>
  20 #include <linux/dvb/frontend.h>
  21 #include <linux/i2c.h>
  22 #include <linux/slab.h>
  23
  24 #include <media/dvb_frontend.h>
  25
  26 #include "mt2131.h"
  27 #include "mt2131_priv.h"
  28
  29 static int debug;
  30 module_param(debug, int, 0644);
  31 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  32
  33 #define dprintk(level,fmt, arg...) if (debug >= level) \
  34         printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)
  35
  36 static u8 mt2131_config1[] = {
  37         0x01,
  38         0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,
  39         0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
  40         0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,
  41         0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00
  42 };
  43
  44 static u8 mt2131_config2[] = {
  45         0x10,
  46         0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
  47 };
  48
  49 static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)
  50 {
  51         struct i2c_msg msg[2] = {
  52                 { .addr = priv->cfg->i2c_address, .flags = 0,
  53                   .buf = &reg, .len = 1 },
  54                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  55                   .buf = val,  .len = 1 },
  56         };
  57
  58         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  59                 printk(KERN_WARNING "mt2131 I2C read failed\n");
  60                 return -EREMOTEIO;
  61         }
  62         return 0;
  63 }
  64
  65 static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)
  66 {
  67         u8 buf[2] = { reg, val };
  68         struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0,
  69                                .buf = buf, .len = 2 };
  70
  71         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  72                 printk(KERN_WARNING "mt2131 I2C write failed\n");
  73                 return -EREMOTEIO;
  74         }
  75         return 0;
  76 }
  77
  78 static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
  79 {
  80         struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
  81                                .flags = 0, .buf = buf, .len = len };
  82
  83         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  84                 printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",
  85                        (int)len);
  86                 return -EREMOTEIO;
  87         }
  88         return 0;
  89 }
  90
  91 static int mt2131_set_params(struct dvb_frontend *fe)
  92 {
  93         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  94         struct mt2131_priv *priv;
  95         int ret=0, i;
  96         u32 freq;
  97         u8  if_band_center;
  98         u32 f_lo1, f_lo2;
  99         u32 div1, num1, div2, num2;
 100         u8  b[8];
 101         u8 lockval = 0;
 102
 103         priv = fe->tuner_priv;
 104
 105         freq = c->frequency / 1000;  /* Hz -> kHz */
 106         dprintk(1, "%s() freq=%d\n", __func__, freq);
 107
 108         f_lo1 = freq + MT2131_IF1 * 1000;
 109         f_lo1 = (f_lo1 / 250) * 250;
 110         f_lo2 = f_lo1 - freq - MT2131_IF2;
 111
 112         priv->frequency =  (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
 113
 114         /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
 115         num1 = f_lo1 * 64 / (MT2131_FREF / 128);
 116         div1 = num1 / 8192;
 117         num1 &= 0x1fff;
 118
 119         /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
 120         num2 = f_lo2 * 64 / (MT2131_FREF / 128);
 121         div2 = num2 / 8192;
 122         num2 &= 0x1fff;
 123
 124         if (freq <=   82500) if_band_center = 0x00; else
 125         if (freq <=  137500) if_band_center = 0x01; else
 126         if (freq <=  192500) if_band_center = 0x02; else
 127         if (freq <=  247500) if_band_center = 0x03; else
 128         if (freq <=  302500) if_band_center = 0x04; else
 129         if (freq <=  357500) if_band_center = 0x05; else
 130         if (freq <=  412500) if_band_center = 0x06; else
 131         if (freq <=  467500) if_band_center = 0x07; else
 132         if (freq <=  522500) if_band_center = 0x08; else
 133         if (freq <=  577500) if_band_center = 0x09; else
 134         if (freq <=  632500) if_band_center = 0x0A; else
 135         if (freq <=  687500) if_band_center = 0x0B; else
 136         if (freq <=  742500) if_band_center = 0x0C; else
 137         if (freq <=  797500) if_band_center = 0x0D; else
 138         if (freq <=  852500) if_band_center = 0x0E; else
 139         if (freq <=  907500) if_band_center = 0x0F; else
 140         if (freq <=  962500) if_band_center = 0x10; else
 141         if (freq <= 1017500) if_band_center = 0x11; else
 142         if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
 143
 144         b[0] = 1;
 145         b[1] = (num1 >> 5) & 0xFF;
 146         b[2] = (num1 & 0x1F);
 147         b[3] = div1;
 148         b[4] = (num2 >> 5) & 0xFF;
 149         b[5] = num2 & 0x1F;
 150         b[6] = div2;
 151
 152         dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
 153         dprintk(1, "PLL freq=%dkHz  band=%d\n", (int)freq, (int)if_band_center);
 154         dprintk(1, "PLL f_lo1=%dkHz  f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
 155         dprintk(1, "PLL div1=%d  num1=%d  div2=%d  num2=%d\n",
 156                 (int)div1, (int)num1, (int)div2, (int)num2);
 157         dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
 158                 (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
 159                 (int)b[6]);
 160
 161         ret = mt2131_writeregs(priv,b,7);
 162         if (ret < 0)
 163                 return ret;
 164
 165         mt2131_writereg(priv, 0x0b, if_band_center);
 166
 167         /* Wait for lock */
 168         i = 0;
 169         do {
 170                 mt2131_readreg(priv, 0x08, &lockval);
 171                 if ((lockval & 0x88) == 0x88)
 172                         break;
 173                 msleep(4);
 174                 i++;
 175         } while (i < 10);
 176
 177         return ret;
 178 }
 179
 180 static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 181 {
 182         struct mt2131_priv *priv = fe->tuner_priv;
 183         dprintk(1, "%s()\n", __func__);
 184         *frequency = priv->frequency;
 185         return 0;
 186 }
 187
 188 static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
 189 {
 190         struct mt2131_priv *priv = fe->tuner_priv;
 191         u8 lock_status = 0;
 192         u8 afc_status = 0;
 193
 194         *status = 0;
 195
 196         mt2131_readreg(priv, 0x08, &lock_status);
 197         if ((lock_status & 0x88) == 0x88)
 198                 *status = TUNER_STATUS_LOCKED;
 199
 200         mt2131_readreg(priv, 0x09, &afc_status);
 201         dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
 202                 __func__, lock_status, afc_status);
 203
 204         return 0;
 205 }
 206
 207 static int mt2131_init(struct dvb_frontend *fe)
 208 {
 209         struct mt2131_priv *priv = fe->tuner_priv;
 210         int ret;
 211         dprintk(1, "%s()\n", __func__);
 212
 213         if ((ret = mt2131_writeregs(priv, mt2131_config1,
 214                                     sizeof(mt2131_config1))) < 0)
 215                 return ret;
 216
 217         mt2131_writereg(priv, 0x0b, 0x09);
 218         mt2131_writereg(priv, 0x15, 0x47);
 219         mt2131_writereg(priv, 0x07, 0xf2);
 220         mt2131_writereg(priv, 0x0b, 0x01);
 221
 222         if ((ret = mt2131_writeregs(priv, mt2131_config2,
 223                                     sizeof(mt2131_config2))) < 0)
 224                 return ret;
 225
 226         return ret;
 227 }
 228
 229 static void mt2131_release(struct dvb_frontend *fe)
 230 {
 231         dprintk(1, "%s()\n", __func__);
 232         kfree(fe->tuner_priv);
 233         fe->tuner_priv = NULL;
 234 }
 235
 236 static const struct dvb_tuner_ops mt2131_tuner_ops = {
 237         .info = {
 238                 .name              = "Microtune MT2131",
 239                 .frequency_min_hz  =  48 * MHz,
 240                 .frequency_max_hz  = 860 * MHz,
 241                 .frequency_step_hz =  50 * kHz,
 242         },
 243
 244         .release       = mt2131_release,
 245         .init          = mt2131_init,
 246
 247         .set_params    = mt2131_set_params,
 248         .get_frequency = mt2131_get_frequency,
 249         .get_status    = mt2131_get_status
 250 };
 251
 252 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
 253                                     struct i2c_adapter *i2c,
 254                                     struct mt2131_config *cfg, u16 if1)
 255 {
 256         struct mt2131_priv *priv = NULL;
 257         u8 id = 0;
 258
 259         dprintk(1, "%s()\n", __func__);
 260
 261         priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
 262         if (priv == NULL)
 263                 return NULL;
 264
 265         priv->cfg = cfg;
 266         priv->i2c = i2c;
 267
 268         if (mt2131_readreg(priv, 0, &id) != 0) {
 269                 kfree(priv);
 270                 return NULL;
 271         }
 272         if ( (id != 0x3E) && (id != 0x3F) ) {
 273                 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
 274                        cfg->i2c_address);
 275                 kfree(priv);
 276                 return NULL;
 277         }
 278
 279         printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
 280                cfg->i2c_address);
 281         memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
 282                sizeof(struct dvb_tuner_ops));
 283
 284         fe->tuner_priv = priv;
 285         return fe;
 286 }
 287 EXPORT_SYMBOL(mt2131_attach);
 288
 289 MODULE_AUTHOR("Steven Toth");
 290 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
 291 MODULE_LICENSE("GPL");