drivers/media/dvb/frontends/mt2266.c

   1 /*
   2  *  Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
   3  *
   4  *  Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
   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  *  GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/delay.h>
  20 #include <linux/dvb/frontend.h>
  21 #include <linux/i2c.h>
  22
  23 #include "dvb_frontend.h"
  24 #include "mt2266.h"
  25
  26 #define I2C_ADDRESS 0x60
  27
  28 #define REG_PART_REV   0
  29 #define REG_TUNE       1
  30 #define REG_BAND       6
  31 #define REG_BANDWIDTH  8
  32 #define REG_LOCK       0x12
  33
  34 #define PART_REV 0x85
  35
  36 struct mt2266_priv {
  37         struct mt2266_config *cfg;
  38         struct i2c_adapter   *i2c;
  39
  40         u32 frequency;
  41         u32 bandwidth;
  42 };
  43
  44 /* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
  45
  46 static int debug;
  47 module_param(debug, int, 0644);
  48 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  49
  50 #define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)
  51
  52 // Reads a single register
  53 static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val)
  54 {
  55         struct i2c_msg msg[2] = {
  56                 { .addr = priv->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
  57                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val,  .len = 1 },
  58         };
  59         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  60                 printk(KERN_WARNING "MT2266 I2C read failed\n");
  61                 return -EREMOTEIO;
  62         }
  63         return 0;
  64 }
  65
  66 // Writes a single register
  67 static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
  68 {
  69         u8 buf[2] = { reg, val };
  70         struct i2c_msg msg = {
  71                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
  72         };
  73         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  74                 printk(KERN_WARNING "MT2266 I2C write failed\n");
  75                 return -EREMOTEIO;
  76         }
  77         return 0;
  78 }
  79
  80 // Writes a set of consecutive registers
  81 static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len)
  82 {
  83         struct i2c_msg msg = {
  84                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
  85         };
  86         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  87                 printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
  88                 return -EREMOTEIO;
  89         }
  90         return 0;
  91 }
  92
  93 // Initialisation sequences
  94 static u8 mt2266_init1[] = {
  95         REG_TUNE,
  96         0x00, 0x00, 0x28, 0x00, 0x52, 0x99, 0x3f };
  97
  98 static u8 mt2266_init2[] = {
  99         0x17,                                     0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a,
 100         0xd4, 0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14, 0x01, 0x01, 0x01, 0x01,
 101         0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff, 0xff, 0x00, 0x77, 0x0f, 0x2d };
 102
 103 static u8 mt2266_init_8mhz[] = {
 104         REG_BANDWIDTH,
 105         0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22 };
 106
 107 static u8 mt2266_init_7mhz[] = {
 108         REG_BANDWIDTH,
 109         0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32 };
 110
 111 static u8 mt2266_init_6mhz[] = {
 112         REG_BANDWIDTH,
 113         0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7 };
 114
 115 #define FREF 30000       // Quartz oscillator 30 MHz
 116
 117 static int mt2266_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
 118 {
 119         struct mt2266_priv *priv;
 120         int ret=0;
 121         u32 freq;
 122         u32 tune;
 123         u8  lnaband;
 124         u8  b[10];
 125         int i;
 126
 127         priv = fe->tuner_priv;
 128
 129         mt2266_writereg(priv,0x17,0x6d);
 130         mt2266_writereg(priv,0x1c,0xff);
 131
 132         freq = params->frequency / 1000; // Hz -> kHz
 133         priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
 134         priv->frequency = freq * 1000;
 135         tune=2 * freq * (8192/16) / (FREF/16);
 136
 137         if (freq <= 495000) lnaband = 0xEE; else
 138         if (freq <= 525000) lnaband = 0xDD; else
 139         if (freq <= 550000) lnaband = 0xCC; else
 140         if (freq <= 580000) lnaband = 0xBB; else
 141         if (freq <= 605000) lnaband = 0xAA; else
 142         if (freq <= 630000) lnaband = 0x99; else
 143         if (freq <= 655000) lnaband = 0x88; else
 144         if (freq <= 685000) lnaband = 0x77; else
 145         if (freq <= 710000) lnaband = 0x66; else
 146         if (freq <= 735000) lnaband = 0x55; else
 147         if (freq <= 765000) lnaband = 0x44; else
 148         if (freq <= 802000) lnaband = 0x33; else
 149         if (freq <= 840000) lnaband = 0x22; else lnaband = 0x11;
 150
 151         msleep(100);
 152         mt2266_writeregs(priv,(params->u.ofdm.bandwidth==BANDWIDTH_6_MHZ)?mt2266_init_6mhz:
 153                                 (params->u.ofdm.bandwidth==BANDWIDTH_7_MHZ)?mt2266_init_7mhz:
 154                                 mt2266_init_8mhz,sizeof(mt2266_init_8mhz));
 155
 156         b[0] = REG_TUNE;
 157         b[1] = (tune >> 8) & 0x1F;
 158         b[2] = tune & 0xFF;
 159         b[3] = tune >> 13;
 160         mt2266_writeregs(priv,b,4);
 161
 162         dprintk("set_parms: tune=%d band=%d\n",(int)tune,(int)lnaband);
 163         dprintk("set_parms: [1..3]: %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3]);
 164
 165         b[0] = 0x05;
 166         b[1] = 0x62;
 167         b[2] = lnaband;
 168         mt2266_writeregs(priv,b,3);
 169
 170         //Waits for pll lock or timeout
 171         i = 0;
 172         do {
 173                 mt2266_readreg(priv,REG_LOCK,b);
 174                 if ((b[0] & 0x40)==0x40)
 175                         break;
 176                 msleep(10);
 177                 i++;
 178         } while (i<10);
 179         dprintk("Lock when i=%i\n",(int)i);
 180         return ret;
 181 }
 182
 183 static void mt2266_calibrate(struct mt2266_priv *priv)
 184 {
 185         mt2266_writereg(priv,0x11,0x03);
 186         mt2266_writereg(priv,0x11,0x01);
 187
 188         mt2266_writeregs(priv,mt2266_init1,sizeof(mt2266_init1));
 189         mt2266_writeregs(priv,mt2266_init2,sizeof(mt2266_init2));
 190
 191         mt2266_writereg(priv,0x33,0x5e);
 192         mt2266_writereg(priv,0x10,0x10);
 193         mt2266_writereg(priv,0x10,0x00);
 194
 195         mt2266_writeregs(priv,mt2266_init_8mhz,sizeof(mt2266_init_8mhz));
 196
 197         msleep(25);
 198         mt2266_writereg(priv,0x17,0x6d);
 199         mt2266_writereg(priv,0x1c,0x00);
 200         msleep(75);
 201         mt2266_writereg(priv,0x17,0x6d);
 202         mt2266_writereg(priv,0x1c,0xff);
 203 }
 204
 205 static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 206 {
 207         struct mt2266_priv *priv = fe->tuner_priv;
 208         *frequency = priv->frequency;
 209         return 0;
 210 }
 211
 212 static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 213 {
 214         struct mt2266_priv *priv = fe->tuner_priv;
 215         *bandwidth = priv->bandwidth;
 216         return 0;
 217 }
 218
 219 static int mt2266_init(struct dvb_frontend *fe)
 220 {
 221         struct mt2266_priv *priv = fe->tuner_priv;
 222         mt2266_writereg(priv,0x17,0x6d);
 223         mt2266_writereg(priv,0x1c,0xff);
 224         return 0;
 225 }
 226
 227 static int mt2266_sleep(struct dvb_frontend *fe)
 228 {
 229         struct mt2266_priv *priv = fe->tuner_priv;
 230         mt2266_writereg(priv,0x17,0x6d);
 231         mt2266_writereg(priv,0x1c,0x00);
 232         return 0;
 233 }
 234
 235 static int mt2266_release(struct dvb_frontend *fe)
 236 {
 237         kfree(fe->tuner_priv);
 238         fe->tuner_priv = NULL;
 239         return 0;
 240 }
 241
 242 static const struct dvb_tuner_ops mt2266_tuner_ops = {
 243         .info = {
 244                 .name           = "Microtune MT2266",
 245                 .frequency_min  = 470000000,
 246                 .frequency_max  = 860000000,
 247                 .frequency_step =     50000,
 248         },
 249         .release       = mt2266_release,
 250         .init          = mt2266_init,
 251         .sleep         = mt2266_sleep,
 252         .set_params    = mt2266_set_params,
 253         .get_frequency = mt2266_get_frequency,
 254         .get_bandwidth = mt2266_get_bandwidth
 255 };
 256
 257 struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg)
 258 {
 259         struct mt2266_priv *priv = NULL;
 260         u8 id = 0;
 261
 262         priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
 263         if (priv == NULL)
 264                 return NULL;
 265
 266         priv->cfg      = cfg;
 267         priv->i2c      = i2c;
 268
 269         if (mt2266_readreg(priv,0,&id) != 0) {
 270                 kfree(priv);
 271                 return NULL;
 272         }
 273         if (id != PART_REV) {
 274                 kfree(priv);
 275                 return NULL;
 276         }
 277         printk(KERN_INFO "MT2266: successfully identified\n");
 278         memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));
 279
 280         fe->tuner_priv = priv;
 281         mt2266_calibrate(priv);
 282         return fe;
 283 }
 284 EXPORT_SYMBOL(mt2266_attach);
 285
 286 MODULE_AUTHOR("Olivier DANET");
 287 MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
 288 MODULE_LICENSE("GPL");