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  *  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
  33 static int debug;
  34 module_param(debug, int, 0644);
  35 MODULE_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
  40 static 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
  48 static u8 mt2131_config2[] = {
  49         0x10,
  50         0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
  51 };
  52
  53 static 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
  69 static 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
  82 static 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
  95 static 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
 184 static 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
 192 static 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
 211 static 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
 233 static void mt2131_release(struct dvb_frontend *fe)
 234 {
 235         dprintk(1, "%s()\n", __func__);
 236         kfree(fe->tuner_priv);
 237         fe->tuner_priv = NULL;
 238 }
 239
 240 static const struct dvb_tuner_ops mt2131_tuner_ops = {
 241         .info = {
 242                 .name           = "Microtune MT2131",
 243                 .frequency_min  =  48000000,
 244                 .frequency_max  = 860000000,
 245                 .frequency_step =     50000,
 246         },
 247
 248         .release       = mt2131_release,
 249         .init          = mt2131_init,
 250
 251         .set_params    = mt2131_set_params,
 252         .get_frequency = mt2131_get_frequency,
 253         .get_status    = mt2131_get_status
 254 };
 255
 256 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
 257                                     struct i2c_adapter *i2c,
 258                                     struct mt2131_config *cfg, u16 if1)
 259 {
 260         struct mt2131_priv *priv = NULL;
 261         u8 id = 0;
 262
 263         dprintk(1, "%s()\n", __func__);
 264
 265         priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
 266         if (priv == NULL)
 267                 return NULL;
 268
 269         priv->cfg = cfg;
 270         priv->i2c = i2c;
 271
 272         if (mt2131_readreg(priv, 0, &id) != 0) {
 273                 kfree(priv);
 274                 return NULL;
 275         }
 276         if ( (id != 0x3E) && (id != 0x3F) ) {
 277                 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
 278                        cfg->i2c_address);
 279                 kfree(priv);
 280                 return NULL;
 281         }
 282
 283         printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
 284                cfg->i2c_address);
 285         memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
 286                sizeof(struct dvb_tuner_ops));
 287
 288         fe->tuner_priv = priv;
 289         return fe;
 290 }
 291 EXPORT_SYMBOL(mt2131_attach);
 292
 293 MODULE_AUTHOR("Steven Toth");
 294 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
 295 MODULE_LICENSE("GPL");