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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for Microtune MT2131 "QAM/8VSB single chip tuner"4 *5 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>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 16#include "mt2131.h"17#include "mt2131_priv.h"18 19static int debug;20module_param(debug, int, 0644);21MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");22 23#define dprintk(level,fmt, arg...) if (debug >= level) \24 printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)25 26static u8 mt2131_config1[] = {27 0x01,28 0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,29 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,30 0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,31 0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x0032};33 34static u8 mt2131_config2[] = {35 0x10,36 0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x0437};38 39static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)40{41 struct i2c_msg msg[2] = {42 { .addr = priv->cfg->i2c_address, .flags = 0,43 .buf = ®, .len = 1 },44 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,45 .buf = val, .len = 1 },46 };47 48 if (i2c_transfer(priv->i2c, msg, 2) != 2) {49 printk(KERN_WARNING "mt2131 I2C read failed\n");50 return -EREMOTEIO;51 }52 return 0;53}54 55static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)56{57 u8 buf[2] = { reg, val };58 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0,59 .buf = buf, .len = 2 };60 61 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {62 printk(KERN_WARNING "mt2131 I2C write failed\n");63 return -EREMOTEIO;64 }65 return 0;66}67 68static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)69{70 struct i2c_msg msg = { .addr = priv->cfg->i2c_address,71 .flags = 0, .buf = buf, .len = len };72 73 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {74 printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",75 (int)len);76 return -EREMOTEIO;77 }78 return 0;79}80 81static int mt2131_set_params(struct dvb_frontend *fe)82{83 struct dtv_frontend_properties *c = &fe->dtv_property_cache;84 struct mt2131_priv *priv;85 int ret=0, i;86 u32 freq;87 u8 if_band_center;88 u32 f_lo1, f_lo2;89 u32 div1, num1, div2, num2;90 u8 b[8];91 u8 lockval = 0;92 93 priv = fe->tuner_priv;94 95 freq = c->frequency / 1000; /* Hz -> kHz */96 dprintk(1, "%s() freq=%d\n", __func__, freq);97 98 f_lo1 = freq + MT2131_IF1 * 1000;99 f_lo1 = (f_lo1 / 250) * 250;100 f_lo2 = f_lo1 - freq - MT2131_IF2;101 102 priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000;103 104 /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */105 num1 = f_lo1 * 64 / (MT2131_FREF / 128);106 div1 = num1 / 8192;107 num1 &= 0x1fff;108 109 /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */110 num2 = f_lo2 * 64 / (MT2131_FREF / 128);111 div2 = num2 / 8192;112 num2 &= 0x1fff;113 114 if (freq <= 82500) if_band_center = 0x00; else115 if (freq <= 137500) if_band_center = 0x01; else116 if (freq <= 192500) if_band_center = 0x02; else117 if (freq <= 247500) if_band_center = 0x03; else118 if (freq <= 302500) if_band_center = 0x04; else119 if (freq <= 357500) if_band_center = 0x05; else120 if (freq <= 412500) if_band_center = 0x06; else121 if (freq <= 467500) if_band_center = 0x07; else122 if (freq <= 522500) if_band_center = 0x08; else123 if (freq <= 577500) if_band_center = 0x09; else124 if (freq <= 632500) if_band_center = 0x0A; else125 if (freq <= 687500) if_band_center = 0x0B; else126 if (freq <= 742500) if_band_center = 0x0C; else127 if (freq <= 797500) if_band_center = 0x0D; else128 if (freq <= 852500) if_band_center = 0x0E; else129 if (freq <= 907500) if_band_center = 0x0F; else130 if (freq <= 962500) if_band_center = 0x10; else131 if (freq <= 1017500) if_band_center = 0x11; else132 if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;133 134 b[0] = 1;135 b[1] = (num1 >> 5) & 0xFF;136 b[2] = (num1 & 0x1F);137 b[3] = div1;138 b[4] = (num2 >> 5) & 0xFF;139 b[5] = num2 & 0x1F;140 b[6] = div2;141 142 dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);143 dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center);144 dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);145 dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n",146 (int)div1, (int)num1, (int)div2, (int)num2);147 dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",148 (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],149 (int)b[6]);150 151 ret = mt2131_writeregs(priv,b,7);152 if (ret < 0)153 return ret;154 155 mt2131_writereg(priv, 0x0b, if_band_center);156 157 /* Wait for lock */158 i = 0;159 do {160 mt2131_readreg(priv, 0x08, &lockval);161 if ((lockval & 0x88) == 0x88)162 break;163 msleep(4);164 i++;165 } while (i < 10);166 167 return ret;168}169 170static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)171{172 struct mt2131_priv *priv = fe->tuner_priv;173 dprintk(1, "%s()\n", __func__);174 *frequency = priv->frequency;175 return 0;176}177 178static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)179{180 struct mt2131_priv *priv = fe->tuner_priv;181 u8 lock_status = 0;182 u8 afc_status = 0;183 184 *status = 0;185 186 mt2131_readreg(priv, 0x08, &lock_status);187 if ((lock_status & 0x88) == 0x88)188 *status = TUNER_STATUS_LOCKED;189 190 mt2131_readreg(priv, 0x09, &afc_status);191 dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",192 __func__, lock_status, afc_status);193 194 return 0;195}196 197static int mt2131_init(struct dvb_frontend *fe)198{199 struct mt2131_priv *priv = fe->tuner_priv;200 int ret;201 dprintk(1, "%s()\n", __func__);202 203 if ((ret = mt2131_writeregs(priv, mt2131_config1,204 sizeof(mt2131_config1))) < 0)205 return ret;206 207 mt2131_writereg(priv, 0x0b, 0x09);208 mt2131_writereg(priv, 0x15, 0x47);209 mt2131_writereg(priv, 0x07, 0xf2);210 mt2131_writereg(priv, 0x0b, 0x01);211 212 if ((ret = mt2131_writeregs(priv, mt2131_config2,213 sizeof(mt2131_config2))) < 0)214 return ret;215 216 return ret;217}218 219static void mt2131_release(struct dvb_frontend *fe)220{221 dprintk(1, "%s()\n", __func__);222 kfree(fe->tuner_priv);223 fe->tuner_priv = NULL;224}225 226static const struct dvb_tuner_ops mt2131_tuner_ops = {227 .info = {228 .name = "Microtune MT2131",229 .frequency_min_hz = 48 * MHz,230 .frequency_max_hz = 860 * MHz,231 .frequency_step_hz = 50 * kHz,232 },233 234 .release = mt2131_release,235 .init = mt2131_init,236 237 .set_params = mt2131_set_params,238 .get_frequency = mt2131_get_frequency,239 .get_status = mt2131_get_status240};241 242struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,243 struct i2c_adapter *i2c,244 struct mt2131_config *cfg, u16 if1)245{246 struct mt2131_priv *priv = NULL;247 u8 id = 0;248 249 dprintk(1, "%s()\n", __func__);250 251 priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);252 if (priv == NULL)253 return NULL;254 255 priv->cfg = cfg;256 priv->i2c = i2c;257 258 if (mt2131_readreg(priv, 0, &id) != 0) {259 kfree(priv);260 return NULL;261 }262 if ( (id != 0x3E) && (id != 0x3F) ) {263 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",264 cfg->i2c_address);265 kfree(priv);266 return NULL;267 }268 269 printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",270 cfg->i2c_address);271 memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,272 sizeof(struct dvb_tuner_ops));273 274 fe->tuner_priv = priv;275 return fe;276}277EXPORT_SYMBOL_GPL(mt2131_attach);278 279MODULE_AUTHOR("Steven Toth");280MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");281MODULE_LICENSE("GPL");282