linux/drivers/media/tuners/mt2266.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
   4 *
   5 *  Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/delay.h>
  10#include <linux/dvb/frontend.h>
  11#include <linux/i2c.h>
  12#include <linux/slab.h>
  13
  14#include <media/dvb_frontend.h>
  15#include "mt2266.h"
  16
  17#define I2C_ADDRESS 0x60
  18
  19#define REG_PART_REV   0
  20#define REG_TUNE       1
  21#define REG_BAND       6
  22#define REG_BANDWIDTH  8
  23#define REG_LOCK       0x12
  24
  25#define PART_REV 0x85
  26
  27struct mt2266_priv {
  28        struct mt2266_config *cfg;
  29        struct i2c_adapter   *i2c;
  30
  31        u32 frequency;
  32        u32 bandwidth;
  33        u8 band;
  34};
  35
  36#define MT2266_VHF 1
  37#define MT2266_UHF 0
  38
  39/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
  40
  41static int debug;
  42module_param(debug, int, 0644);
  43MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  44
  45#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)
  46
  47// Reads a single register
  48static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val)
  49{
  50        struct i2c_msg msg[2] = {
  51                { .addr = priv->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
  52                { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val,  .len = 1 },
  53        };
  54        if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  55                printk(KERN_WARNING "MT2266 I2C read failed\n");
  56                return -EREMOTEIO;
  57        }
  58        return 0;
  59}
  60
  61// Writes a single register
  62static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
  63{
  64        u8 buf[2] = { reg, val };
  65        struct i2c_msg msg = {
  66                .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
  67        };
  68        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  69                printk(KERN_WARNING "MT2266 I2C write failed\n");
  70                return -EREMOTEIO;
  71        }
  72        return 0;
  73}
  74
  75// Writes a set of consecutive registers
  76static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len)
  77{
  78        struct i2c_msg msg = {
  79                .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
  80        };
  81        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  82                printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
  83                return -EREMOTEIO;
  84        }
  85        return 0;
  86}
  87
  88// Initialisation sequences
  89static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
  90                                 0x00, 0x52, 0x99, 0x3f };
  91
  92static u8 mt2266_init2[] = {
  93    0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4,
  94    0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14,
  95    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff,
  96    0xff, 0x00, 0x77, 0x0f, 0x2d
  97};
  98
  99static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
 100                                                0x22, 0x22, 0x22, 0x22 };
 101
 102static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
 103                                                0x32, 0x32, 0x32, 0x32 };
 104
 105static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
 106                                                0xa7, 0xa7, 0xa7, 0xa7 };
 107
 108static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
 109                           0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };
 110
 111static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
 112                           0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };
 113
 114#define FREF 30000       // Quartz oscillator 30 MHz
 115
 116static int mt2266_set_params(struct dvb_frontend *fe)
 117{
 118        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 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        u8 band;
 127
 128        priv = fe->tuner_priv;
 129
 130        freq = priv->frequency / 1000; /* Hz -> kHz */
 131        if (freq < 470000 && freq > 230000)
 132                return -EINVAL; /* Gap between VHF and UHF bands */
 133
 134        priv->frequency = c->frequency;
 135        tune = 2 * freq * (8192/16) / (FREF/16);
 136        band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
 137        if (band == MT2266_VHF)
 138                tune *= 2;
 139
 140        switch (c->bandwidth_hz) {
 141        case 6000000:
 142                mt2266_writeregs(priv, mt2266_init_6mhz,
 143                                 sizeof(mt2266_init_6mhz));
 144                break;
 145        case 8000000:
 146                mt2266_writeregs(priv, mt2266_init_8mhz,
 147                                 sizeof(mt2266_init_8mhz));
 148                break;
 149        case 7000000:
 150        default:
 151                mt2266_writeregs(priv, mt2266_init_7mhz,
 152                                 sizeof(mt2266_init_7mhz));
 153                break;
 154        }
 155        priv->bandwidth = c->bandwidth_hz;
 156
 157        if (band == MT2266_VHF && priv->band == MT2266_UHF) {
 158                dprintk("Switch from UHF to VHF");
 159                mt2266_writereg(priv, 0x05, 0x04);
 160                mt2266_writereg(priv, 0x19, 0x61);
 161                mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
 162        } else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
 163                dprintk("Switch from VHF to UHF");
 164                mt2266_writereg(priv, 0x05, 0x52);
 165                mt2266_writereg(priv, 0x19, 0x61);
 166                mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
 167        }
 168        msleep(10);
 169
 170        if (freq <= 495000)
 171                lnaband = 0xEE;
 172        else if (freq <= 525000)
 173                lnaband = 0xDD;
 174        else if (freq <= 550000)
 175                lnaband = 0xCC;
 176        else if (freq <= 580000)
 177                lnaband = 0xBB;
 178        else if (freq <= 605000)
 179                lnaband = 0xAA;
 180        else if (freq <= 630000)
 181                lnaband = 0x99;
 182        else if (freq <= 655000)
 183                lnaband = 0x88;
 184        else if (freq <= 685000)
 185                lnaband = 0x77;
 186        else if (freq <= 710000)
 187                lnaband = 0x66;
 188        else if (freq <= 735000)
 189                lnaband = 0x55;
 190        else if (freq <= 765000)
 191                lnaband = 0x44;
 192        else if (freq <= 802000)
 193                lnaband = 0x33;
 194        else if (freq <= 840000)
 195                lnaband = 0x22;
 196        else
 197                lnaband = 0x11;
 198
 199        b[0] = REG_TUNE;
 200        b[1] = (tune >> 8) & 0x1F;
 201        b[2] = tune & 0xFF;
 202        b[3] = tune >> 13;
 203        mt2266_writeregs(priv,b,4);
 204
 205        dprintk("set_parms: tune=%d band=%d %s",
 206                (int) tune, (int) lnaband,
 207                (band == MT2266_UHF) ? "UHF" : "VHF");
 208        dprintk("set_parms: [1..3]: %2x %2x %2x",
 209                (int) b[1], (int) b[2], (int)b[3]);
 210
 211        if (band == MT2266_UHF) {
 212                b[0] = 0x05;
 213                b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
 214                b[2] = lnaband;
 215                mt2266_writeregs(priv, b, 3);
 216        }
 217
 218        /* Wait for pll lock or timeout */
 219        i = 0;
 220        do {
 221                mt2266_readreg(priv,REG_LOCK,b);
 222                if (b[0] & 0x40)
 223                        break;
 224                msleep(10);
 225                i++;
 226        } while (i<10);
 227        dprintk("Lock when i=%i",(int)i);
 228
 229        if (band == MT2266_UHF && priv->band == MT2266_VHF)
 230                mt2266_writereg(priv, 0x05, 0x62);
 231
 232        priv->band = band;
 233
 234        return ret;
 235}
 236
 237static void mt2266_calibrate(struct mt2266_priv *priv)
 238{
 239        mt2266_writereg(priv, 0x11, 0x03);
 240        mt2266_writereg(priv, 0x11, 0x01);
 241        mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
 242        mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
 243        mt2266_writereg(priv, 0x33, 0x5e);
 244        mt2266_writereg(priv, 0x10, 0x10);
 245        mt2266_writereg(priv, 0x10, 0x00);
 246        mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
 247        msleep(25);
 248        mt2266_writereg(priv, 0x17, 0x6d);
 249        mt2266_writereg(priv, 0x1c, 0x00);
 250        msleep(75);
 251        mt2266_writereg(priv, 0x17, 0x6d);
 252        mt2266_writereg(priv, 0x1c, 0xff);
 253}
 254
 255static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 256{
 257        struct mt2266_priv *priv = fe->tuner_priv;
 258        *frequency = priv->frequency;
 259        return 0;
 260}
 261
 262static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 263{
 264        struct mt2266_priv *priv = fe->tuner_priv;
 265        *bandwidth = priv->bandwidth;
 266        return 0;
 267}
 268
 269static int mt2266_init(struct dvb_frontend *fe)
 270{
 271        int ret;
 272        struct mt2266_priv *priv = fe->tuner_priv;
 273        ret = mt2266_writereg(priv, 0x17, 0x6d);
 274        if (ret < 0)
 275                return ret;
 276        ret = mt2266_writereg(priv, 0x1c, 0xff);
 277        if (ret < 0)
 278                return ret;
 279        return 0;
 280}
 281
 282static int mt2266_sleep(struct dvb_frontend *fe)
 283{
 284        struct mt2266_priv *priv = fe->tuner_priv;
 285        mt2266_writereg(priv, 0x17, 0x6d);
 286        mt2266_writereg(priv, 0x1c, 0x00);
 287        return 0;
 288}
 289
 290static void mt2266_release(struct dvb_frontend *fe)
 291{
 292        kfree(fe->tuner_priv);
 293        fe->tuner_priv = NULL;
 294}
 295
 296static const struct dvb_tuner_ops mt2266_tuner_ops = {
 297        .info = {
 298                .name              = "Microtune MT2266",
 299                .frequency_min_hz  = 174 * MHz,
 300                .frequency_max_hz  = 862 * MHz,
 301                .frequency_step_hz =  50 * kHz,
 302        },
 303        .release       = mt2266_release,
 304        .init          = mt2266_init,
 305        .sleep         = mt2266_sleep,
 306        .set_params    = mt2266_set_params,
 307        .get_frequency = mt2266_get_frequency,
 308        .get_bandwidth = mt2266_get_bandwidth
 309};
 310
 311struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg)
 312{
 313        struct mt2266_priv *priv = NULL;
 314        u8 id = 0;
 315
 316        priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
 317        if (priv == NULL)
 318                return NULL;
 319
 320        priv->cfg      = cfg;
 321        priv->i2c      = i2c;
 322        priv->band     = MT2266_UHF;
 323
 324        if (mt2266_readreg(priv, 0, &id)) {
 325                kfree(priv);
 326                return NULL;
 327        }
 328        if (id != PART_REV) {
 329                kfree(priv);
 330                return NULL;
 331        }
 332        printk(KERN_INFO "MT2266: successfully identified\n");
 333        memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));
 334
 335        fe->tuner_priv = priv;
 336        mt2266_calibrate(priv);
 337        return fe;
 338}
 339EXPORT_SYMBOL(mt2266_attach);
 340
 341MODULE_AUTHOR("Olivier DANET");
 342MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
 343MODULE_LICENSE("GPL");
 344