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linux/drivers/media/common/tuners/mt2266.c
Mauro Carvalho Chehab b094516f95 V4L/DVB (7769): Move other terrestrial tuners to common/tuners 
Those tuners are currently used only under media/dvb. However,
they can support also analog TV. Better to move them to the same place
as the other hybrid tuners. This would make easier to use those tuners also
by analog drivers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-29 18:41:38 -03:00

352 lines
8.9 KiB
C
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/*
* Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
*
* Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include "dvb_frontend.h"
#include "mt2266.h"
#define I2C_ADDRESS 0x60
#define REG_PART_REV 0
#define REG_TUNE 1
#define REG_BAND 6
#define REG_BANDWIDTH 8
#define REG_LOCK 0x12
#define PART_REV 0x85
struct mt2266_priv {
struct mt2266_config *cfg;
struct i2c_adapter *i2c;
u32 frequency;
u32 bandwidth;
u8 band;
};
#define MT2266_VHF 1
#define MT2266_UHF 0
/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)
// Reads a single register
static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
{ .addr = priv->cfg->i2c_address, .flags = 0, .buf = &reg, .len = 1 },
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 },
};
if (i2c_transfer(priv->i2c, msg, 2) != 2) {
printk(KERN_WARNING "MT2266 I2C read failed\n");
return -EREMOTEIO;
}
return 0;
}
// Writes a single register
static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
{
u8 buf[2] = { reg, val };
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
};
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "MT2266 I2C write failed\n");
return -EREMOTEIO;
}
return 0;
}
// Writes a set of consecutive registers
static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len)
{
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
};
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
return -EREMOTEIO;
}
return 0;
}
// Initialisation sequences
static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
0x00, 0x52, 0x99, 0x3f };
static u8 mt2266_init2[] = {
0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4,
0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff,
0xff, 0x00, 0x77, 0x0f, 0x2d
};
static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
0x22, 0x22, 0x22, 0x22 };
static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
0x32, 0x32, 0x32, 0x32 };
static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
0xa7, 0xa7, 0xa7, 0xa7 };
static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };
static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };
#define FREF 30000 // Quartz oscillator 30 MHz
static int mt2266_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
{
struct mt2266_priv *priv;
int ret=0;
u32 freq;
u32 tune;
u8 lnaband;
u8 b[10];
int i;
u8 band;
priv = fe->tuner_priv;
freq = params->frequency / 1000; // Hz -> kHz
if (freq < 470000 && freq > 230000)
return -EINVAL; /* Gap between VHF and UHF bands */
priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
priv->frequency = freq * 1000;
tune = 2 * freq * (8192/16) / (FREF/16);
band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
if (band == MT2266_VHF)
tune *= 2;
switch (params->u.ofdm.bandwidth) {
case BANDWIDTH_6_MHZ:
mt2266_writeregs(priv, mt2266_init_6mhz,
sizeof(mt2266_init_6mhz));
break;
case BANDWIDTH_7_MHZ:
mt2266_writeregs(priv, mt2266_init_7mhz,
sizeof(mt2266_init_7mhz));
break;
case BANDWIDTH_8_MHZ:
default:
mt2266_writeregs(priv, mt2266_init_8mhz,
sizeof(mt2266_init_8mhz));
break;
}
if (band == MT2266_VHF && priv->band == MT2266_UHF) {
dprintk("Switch from UHF to VHF");
mt2266_writereg(priv, 0x05, 0x04);
mt2266_writereg(priv, 0x19, 0x61);
mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
} else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
dprintk("Switch from VHF to UHF");
mt2266_writereg(priv, 0x05, 0x52);
mt2266_writereg(priv, 0x19, 0x61);
mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
}
msleep(10);
if (freq <= 495000)
lnaband = 0xEE;
else if (freq <= 525000)
lnaband = 0xDD;
else if (freq <= 550000)
lnaband = 0xCC;
else if (freq <= 580000)
lnaband = 0xBB;
else if (freq <= 605000)
lnaband = 0xAA;
else if (freq <= 630000)
lnaband = 0x99;
else if (freq <= 655000)
lnaband = 0x88;
else if (freq <= 685000)
lnaband = 0x77;
else if (freq <= 710000)
lnaband = 0x66;
else if (freq <= 735000)
lnaband = 0x55;
else if (freq <= 765000)
lnaband = 0x44;
else if (freq <= 802000)
lnaband = 0x33;
else if (freq <= 840000)
lnaband = 0x22;
else
lnaband = 0x11;
b[0] = REG_TUNE;
b[1] = (tune >> 8) & 0x1F;
b[2] = tune & 0xFF;
b[3] = tune >> 13;
mt2266_writeregs(priv,b,4);
dprintk("set_parms: tune=%d band=%d %s",
(int) tune, (int) lnaband,
(band == MT2266_UHF) ? "UHF" : "VHF");
dprintk("set_parms: [1..3]: %2x %2x %2x",
(int) b[1], (int) b[2], (int)b[3]);
if (band == MT2266_UHF) {
b[0] = 0x05;
b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
b[2] = lnaband;
mt2266_writeregs(priv, b, 3);
}
/* Wait for pll lock or timeout */
i = 0;
do {
mt2266_readreg(priv,REG_LOCK,b);
if (b[0] & 0x40)
break;
msleep(10);
i++;
} while (i<10);
dprintk("Lock when i=%i",(int)i);
if (band == MT2266_UHF && priv->band == MT2266_VHF)
mt2266_writereg(priv, 0x05, 0x62);
priv->band = band;
return ret;
}
static void mt2266_calibrate(struct mt2266_priv *priv)
{
mt2266_writereg(priv, 0x11, 0x03);
mt2266_writereg(priv, 0x11, 0x01);
mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
mt2266_writereg(priv, 0x33, 0x5e);
mt2266_writereg(priv, 0x10, 0x10);
mt2266_writereg(priv, 0x10, 0x00);
mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
msleep(25);
mt2266_writereg(priv, 0x17, 0x6d);
mt2266_writereg(priv, 0x1c, 0x00);
msleep(75);
mt2266_writereg(priv, 0x17, 0x6d);
mt2266_writereg(priv, 0x1c, 0xff);
}
static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct mt2266_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
struct mt2266_priv *priv = fe->tuner_priv;
*bandwidth = priv->bandwidth;
return 0;
}
static int mt2266_init(struct dvb_frontend *fe)
{
int ret;
struct mt2266_priv *priv = fe->tuner_priv;
ret = mt2266_writereg(priv, 0x17, 0x6d);
if (ret < 0)
return ret;
ret = mt2266_writereg(priv, 0x1c, 0xff);
if (ret < 0)
return ret;
return 0;
}
static int mt2266_sleep(struct dvb_frontend *fe)
{
struct mt2266_priv *priv = fe->tuner_priv;
mt2266_writereg(priv, 0x17, 0x6d);
mt2266_writereg(priv, 0x1c, 0x00);
return 0;
}
static int mt2266_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static const struct dvb_tuner_ops mt2266_tuner_ops = {
.info = {
.name = "Microtune MT2266",
.frequency_min = 174000000,
.frequency_max = 862000000,
.frequency_step = 50000,
},
.release = mt2266_release,
.init = mt2266_init,
.sleep = mt2266_sleep,
.set_params = mt2266_set_params,
.get_frequency = mt2266_get_frequency,
.get_bandwidth = mt2266_get_bandwidth
};
struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg)
{
struct mt2266_priv *priv = NULL;
u8 id = 0;
priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
priv->band = MT2266_UHF;
if (mt2266_readreg(priv, 0, &id)) {
kfree(priv);
return NULL;
}
if (id != PART_REV) {
kfree(priv);
return NULL;
}
printk(KERN_INFO "MT2266: successfully identified\n");
memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
mt2266_calibrate(priv);
return fe;
}
EXPORT_SYMBOL(mt2266_attach);
MODULE_AUTHOR("Olivier DANET");
MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
MODULE_LICENSE("GPL");
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