282 lines
7.1 KiB
C
282 lines
7.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Microtune MT2131 "QAM/8VSB single chip tuner"
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*
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* Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
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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 "mt2131.h"
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#include "mt2131_priv.h"
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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(level,fmt, arg...) if (debug >= level) \
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printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)
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static u8 mt2131_config1[] = {
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0x01,
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0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,
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0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
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0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,
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0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00
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};
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static u8 mt2131_config2[] = {
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0x10,
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0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
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};
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static int mt2131_readreg(struct mt2131_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,
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.buf = ®, .len = 1 },
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{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
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.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 "mt2131 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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static int mt2131_writereg(struct mt2131_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 = { .addr = priv->cfg->i2c_address, .flags = 0,
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.buf = buf, .len = 2 };
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if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
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printk(KERN_WARNING "mt2131 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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static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
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{
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struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
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.flags = 0, .buf = buf, .len = len };
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if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
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printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",
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(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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static int mt2131_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 mt2131_priv *priv;
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int ret=0, i;
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u32 freq;
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u8 if_band_center;
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u32 f_lo1, f_lo2;
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u32 div1, num1, div2, num2;
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u8 b[8];
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u8 lockval = 0;
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priv = fe->tuner_priv;
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freq = c->frequency / 1000; /* Hz -> kHz */
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dprintk(1, "%s() freq=%d\n", __func__, freq);
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f_lo1 = freq + MT2131_IF1 * 1000;
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f_lo1 = (f_lo1 / 250) * 250;
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f_lo2 = f_lo1 - freq - MT2131_IF2;
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priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
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/* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
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num1 = f_lo1 * 64 / (MT2131_FREF / 128);
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div1 = num1 / 8192;
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num1 &= 0x1fff;
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/* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
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num2 = f_lo2 * 64 / (MT2131_FREF / 128);
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div2 = num2 / 8192;
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num2 &= 0x1fff;
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if (freq <= 82500) if_band_center = 0x00; else
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if (freq <= 137500) if_band_center = 0x01; else
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if (freq <= 192500) if_band_center = 0x02; else
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if (freq <= 247500) if_band_center = 0x03; else
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if (freq <= 302500) if_band_center = 0x04; else
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if (freq <= 357500) if_band_center = 0x05; else
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if (freq <= 412500) if_band_center = 0x06; else
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if (freq <= 467500) if_band_center = 0x07; else
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if (freq <= 522500) if_band_center = 0x08; else
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if (freq <= 577500) if_band_center = 0x09; else
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if (freq <= 632500) if_band_center = 0x0A; else
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if (freq <= 687500) if_band_center = 0x0B; else
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if (freq <= 742500) if_band_center = 0x0C; else
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if (freq <= 797500) if_band_center = 0x0D; else
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if (freq <= 852500) if_band_center = 0x0E; else
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if (freq <= 907500) if_band_center = 0x0F; else
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if (freq <= 962500) if_band_center = 0x10; else
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if (freq <= 1017500) if_band_center = 0x11; else
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if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
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b[0] = 1;
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b[1] = (num1 >> 5) & 0xFF;
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b[2] = (num1 & 0x1F);
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b[3] = div1;
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b[4] = (num2 >> 5) & 0xFF;
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b[5] = num2 & 0x1F;
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b[6] = div2;
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dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
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dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center);
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dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
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dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n",
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(int)div1, (int)num1, (int)div2, (int)num2);
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dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
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(int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
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(int)b[6]);
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ret = mt2131_writeregs(priv,b,7);
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if (ret < 0)
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return ret;
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mt2131_writereg(priv, 0x0b, if_band_center);
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/* Wait for lock */
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i = 0;
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do {
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mt2131_readreg(priv, 0x08, &lockval);
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if ((lockval & 0x88) == 0x88)
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break;
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msleep(4);
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i++;
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} while (i < 10);
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return ret;
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}
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static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct mt2131_priv *priv = fe->tuner_priv;
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dprintk(1, "%s()\n", __func__);
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*frequency = priv->frequency;
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return 0;
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}
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static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
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{
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struct mt2131_priv *priv = fe->tuner_priv;
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u8 lock_status = 0;
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u8 afc_status = 0;
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*status = 0;
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mt2131_readreg(priv, 0x08, &lock_status);
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if ((lock_status & 0x88) == 0x88)
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*status = TUNER_STATUS_LOCKED;
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mt2131_readreg(priv, 0x09, &afc_status);
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dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
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__func__, lock_status, afc_status);
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return 0;
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}
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static int mt2131_init(struct dvb_frontend *fe)
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{
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struct mt2131_priv *priv = fe->tuner_priv;
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int ret;
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dprintk(1, "%s()\n", __func__);
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if ((ret = mt2131_writeregs(priv, mt2131_config1,
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sizeof(mt2131_config1))) < 0)
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return ret;
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mt2131_writereg(priv, 0x0b, 0x09);
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mt2131_writereg(priv, 0x15, 0x47);
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mt2131_writereg(priv, 0x07, 0xf2);
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mt2131_writereg(priv, 0x0b, 0x01);
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if ((ret = mt2131_writeregs(priv, mt2131_config2,
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sizeof(mt2131_config2))) < 0)
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return ret;
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return ret;
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}
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static void mt2131_release(struct dvb_frontend *fe)
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{
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dprintk(1, "%s()\n", __func__);
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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 mt2131_tuner_ops = {
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.info = {
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.name = "Microtune MT2131",
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.frequency_min_hz = 48 * MHz,
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.frequency_max_hz = 860 * MHz,
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.frequency_step_hz = 50 * kHz,
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},
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.release = mt2131_release,
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.init = mt2131_init,
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.set_params = mt2131_set_params,
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.get_frequency = mt2131_get_frequency,
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.get_status = mt2131_get_status
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};
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struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
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struct i2c_adapter *i2c,
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struct mt2131_config *cfg, u16 if1)
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{
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struct mt2131_priv *priv = NULL;
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u8 id = 0;
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dprintk(1, "%s()\n", __func__);
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priv = kzalloc(sizeof(struct mt2131_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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if (mt2131_readreg(priv, 0, &id) != 0) {
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kfree(priv);
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return NULL;
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}
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if ( (id != 0x3E) && (id != 0x3F) ) {
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printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
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cfg->i2c_address);
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kfree(priv);
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return NULL;
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}
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printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
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cfg->i2c_address);
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memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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fe->tuner_priv = priv;
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return fe;
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}
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EXPORT_SYMBOL(mt2131_attach);
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MODULE_AUTHOR("Steven Toth");
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MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
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MODULE_LICENSE("GPL");
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