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