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343 lines
8.5 KiB
343 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for Microtune MT2266 "Direct conversion low power broadband tuner" |
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* |
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* Copyright (c) 2007 Olivier DANET <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/dvb/frontend.h> |
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#include <linux/i2c.h> |
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#include <linux/slab.h> |
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#include <media/dvb_frontend.h> |
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#include "mt2266.h" |
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#define I2C_ADDRESS 0x60 |
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#define REG_PART_REV 0 |
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#define REG_TUNE 1 |
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#define REG_BAND 6 |
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#define REG_BANDWIDTH 8 |
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#define REG_LOCK 0x12 |
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#define PART_REV 0x85 |
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struct mt2266_priv { |
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struct mt2266_config *cfg; |
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struct i2c_adapter *i2c; |
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u32 frequency; |
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u32 bandwidth; |
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u8 band; |
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}; |
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#define MT2266_VHF 1 |
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#define MT2266_UHF 0 |
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/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */ |
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static int debug; |
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module_param(debug, int, 0644); |
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MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); |
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#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0) |
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// Reads a single register |
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static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val) |
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{ |
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struct i2c_msg msg[2] = { |
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{ .addr = priv->cfg->i2c_address, .flags = 0, .buf = ®, .len = 1 }, |
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{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 }, |
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}; |
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if (i2c_transfer(priv->i2c, msg, 2) != 2) { |
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printk(KERN_WARNING "MT2266 I2C read failed\n"); |
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return -EREMOTEIO; |
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} |
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return 0; |
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} |
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// Writes a single register |
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static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val) |
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{ |
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u8 buf[2] = { reg, val }; |
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struct i2c_msg msg = { |
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.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2 |
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}; |
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if (i2c_transfer(priv->i2c, &msg, 1) != 1) { |
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printk(KERN_WARNING "MT2266 I2C write failed\n"); |
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return -EREMOTEIO; |
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} |
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return 0; |
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} |
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// Writes a set of consecutive registers |
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static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len) |
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{ |
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struct i2c_msg msg = { |
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.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len |
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}; |
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if (i2c_transfer(priv->i2c, &msg, 1) != 1) { |
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printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len); |
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return -EREMOTEIO; |
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} |
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return 0; |
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} |
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// Initialisation sequences |
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static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28, |
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0x00, 0x52, 0x99, 0x3f }; |
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static u8 mt2266_init2[] = { |
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0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4, |
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0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14, |
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff, |
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0xff, 0x00, 0x77, 0x0f, 0x2d |
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}; |
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static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22, |
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0x22, 0x22, 0x22, 0x22 }; |
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static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32, |
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0x32, 0x32, 0x32, 0x32 }; |
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static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7, |
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0xa7, 0xa7, 0xa7, 0xa7 }; |
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static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64, |
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0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 }; |
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static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5, |
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0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f }; |
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#define FREF 30000 // Quartz oscillator 30 MHz |
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static int mt2266_set_params(struct dvb_frontend *fe) |
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{ |
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struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
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struct mt2266_priv *priv; |
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int ret=0; |
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u32 freq; |
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u32 tune; |
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u8 lnaband; |
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u8 b[10]; |
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int i; |
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u8 band; |
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priv = fe->tuner_priv; |
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freq = priv->frequency / 1000; /* Hz -> kHz */ |
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if (freq < 470000 && freq > 230000) |
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return -EINVAL; /* Gap between VHF and UHF bands */ |
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priv->frequency = c->frequency; |
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tune = 2 * freq * (8192/16) / (FREF/16); |
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band = (freq < 300000) ? MT2266_VHF : MT2266_UHF; |
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if (band == MT2266_VHF) |
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tune *= 2; |
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switch (c->bandwidth_hz) { |
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case 6000000: |
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mt2266_writeregs(priv, mt2266_init_6mhz, |
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sizeof(mt2266_init_6mhz)); |
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break; |
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case 8000000: |
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mt2266_writeregs(priv, mt2266_init_8mhz, |
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sizeof(mt2266_init_8mhz)); |
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break; |
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case 7000000: |
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default: |
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mt2266_writeregs(priv, mt2266_init_7mhz, |
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sizeof(mt2266_init_7mhz)); |
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break; |
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} |
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priv->bandwidth = c->bandwidth_hz; |
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if (band == MT2266_VHF && priv->band == MT2266_UHF) { |
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dprintk("Switch from UHF to VHF"); |
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mt2266_writereg(priv, 0x05, 0x04); |
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mt2266_writereg(priv, 0x19, 0x61); |
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mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf)); |
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} else if (band == MT2266_UHF && priv->band == MT2266_VHF) { |
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dprintk("Switch from VHF to UHF"); |
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mt2266_writereg(priv, 0x05, 0x52); |
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mt2266_writereg(priv, 0x19, 0x61); |
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mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf)); |
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} |
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msleep(10); |
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if (freq <= 495000) |
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lnaband = 0xEE; |
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else if (freq <= 525000) |
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lnaband = 0xDD; |
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else if (freq <= 550000) |
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lnaband = 0xCC; |
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else if (freq <= 580000) |
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lnaband = 0xBB; |
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else if (freq <= 605000) |
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lnaband = 0xAA; |
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else if (freq <= 630000) |
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lnaband = 0x99; |
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else if (freq <= 655000) |
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lnaband = 0x88; |
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else if (freq <= 685000) |
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lnaband = 0x77; |
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else if (freq <= 710000) |
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lnaband = 0x66; |
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else if (freq <= 735000) |
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lnaband = 0x55; |
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else if (freq <= 765000) |
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lnaband = 0x44; |
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else if (freq <= 802000) |
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lnaband = 0x33; |
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else if (freq <= 840000) |
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lnaband = 0x22; |
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else |
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lnaband = 0x11; |
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b[0] = REG_TUNE; |
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b[1] = (tune >> 8) & 0x1F; |
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b[2] = tune & 0xFF; |
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b[3] = tune >> 13; |
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mt2266_writeregs(priv,b,4); |
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dprintk("set_parms: tune=%d band=%d %s", |
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(int) tune, (int) lnaband, |
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(band == MT2266_UHF) ? "UHF" : "VHF"); |
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dprintk("set_parms: [1..3]: %2x %2x %2x", |
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(int) b[1], (int) b[2], (int)b[3]); |
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if (band == MT2266_UHF) { |
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b[0] = 0x05; |
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b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62; |
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b[2] = lnaband; |
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mt2266_writeregs(priv, b, 3); |
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} |
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/* Wait for pll lock or timeout */ |
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i = 0; |
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do { |
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mt2266_readreg(priv,REG_LOCK,b); |
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if (b[0] & 0x40) |
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break; |
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msleep(10); |
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i++; |
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} while (i<10); |
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dprintk("Lock when i=%i",(int)i); |
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if (band == MT2266_UHF && priv->band == MT2266_VHF) |
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mt2266_writereg(priv, 0x05, 0x62); |
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priv->band = band; |
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return ret; |
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} |
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static void mt2266_calibrate(struct mt2266_priv *priv) |
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{ |
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mt2266_writereg(priv, 0x11, 0x03); |
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mt2266_writereg(priv, 0x11, 0x01); |
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mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1)); |
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mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2)); |
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mt2266_writereg(priv, 0x33, 0x5e); |
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mt2266_writereg(priv, 0x10, 0x10); |
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mt2266_writereg(priv, 0x10, 0x00); |
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mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz)); |
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msleep(25); |
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mt2266_writereg(priv, 0x17, 0x6d); |
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mt2266_writereg(priv, 0x1c, 0x00); |
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msleep(75); |
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mt2266_writereg(priv, 0x17, 0x6d); |
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mt2266_writereg(priv, 0x1c, 0xff); |
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} |
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static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
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{ |
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struct mt2266_priv *priv = fe->tuner_priv; |
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*frequency = priv->frequency; |
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return 0; |
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} |
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static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) |
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{ |
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struct mt2266_priv *priv = fe->tuner_priv; |
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*bandwidth = priv->bandwidth; |
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return 0; |
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} |
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static int mt2266_init(struct dvb_frontend *fe) |
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{ |
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int ret; |
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struct mt2266_priv *priv = fe->tuner_priv; |
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ret = mt2266_writereg(priv, 0x17, 0x6d); |
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if (ret < 0) |
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return ret; |
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ret = mt2266_writereg(priv, 0x1c, 0xff); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int mt2266_sleep(struct dvb_frontend *fe) |
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{ |
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struct mt2266_priv *priv = fe->tuner_priv; |
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mt2266_writereg(priv, 0x17, 0x6d); |
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mt2266_writereg(priv, 0x1c, 0x00); |
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return 0; |
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} |
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static void mt2266_release(struct dvb_frontend *fe) |
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{ |
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kfree(fe->tuner_priv); |
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fe->tuner_priv = NULL; |
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} |
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static const struct dvb_tuner_ops mt2266_tuner_ops = { |
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.info = { |
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.name = "Microtune MT2266", |
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.frequency_min_hz = 174 * MHz, |
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.frequency_max_hz = 862 * MHz, |
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.frequency_step_hz = 50 * kHz, |
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}, |
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.release = mt2266_release, |
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.init = mt2266_init, |
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.sleep = mt2266_sleep, |
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.set_params = mt2266_set_params, |
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.get_frequency = mt2266_get_frequency, |
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.get_bandwidth = mt2266_get_bandwidth |
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}; |
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struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg) |
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{ |
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struct mt2266_priv *priv = NULL; |
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u8 id = 0; |
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priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL); |
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if (priv == NULL) |
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return NULL; |
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priv->cfg = cfg; |
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priv->i2c = i2c; |
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priv->band = MT2266_UHF; |
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if (mt2266_readreg(priv, 0, &id)) { |
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kfree(priv); |
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return NULL; |
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} |
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if (id != PART_REV) { |
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kfree(priv); |
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return NULL; |
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} |
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printk(KERN_INFO "MT2266: successfully identified\n"); |
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memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops)); |
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fe->tuner_priv = priv; |
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mt2266_calibrate(priv); |
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return fe; |
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} |
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EXPORT_SYMBOL(mt2266_attach); |
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MODULE_AUTHOR("Olivier DANET"); |
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MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver"); |
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MODULE_LICENSE("GPL");
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