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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 0x6018 19#define REG_PART_REV 020#define REG_TUNE 121#define REG_BAND 622#define REG_BANDWIDTH 823#define REG_LOCK 0x1224 25#define PART_REV 0x8526 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 137#define MT2266_UHF 038 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 register48static 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 = ®, .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 register62static 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 = 267 };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 registers76static 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 = len80 };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 sequences89static 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, 0x2d97};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 MHz115 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 else197 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_bandwidth309};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_GPL(mt2266_attach);340 341MODULE_AUTHOR("Olivier DANET");342MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");343MODULE_LICENSE("GPL");344