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