374 lines
8.9 KiB
C
374 lines
8.9 KiB
C
/*
|
|
* Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
|
|
*
|
|
* Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
|
|
*
|
|
* 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 <linux/slab.h>
|
|
|
|
#include "dvb_frontend.h"
|
|
|
|
#include "mc44s803.h"
|
|
#include "mc44s803_priv.h"
|
|
|
|
#define mc_printk(level, format, arg...) \
|
|
printk(level "mc44s803: " format , ## arg)
|
|
|
|
/* Writes a single register */
|
|
static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
|
|
{
|
|
u8 buf[3];
|
|
struct i2c_msg msg = {
|
|
.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
|
|
};
|
|
|
|
buf[0] = (val & 0xff0000) >> 16;
|
|
buf[1] = (val & 0xff00) >> 8;
|
|
buf[2] = (val & 0xff);
|
|
|
|
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
|
|
mc_printk(KERN_WARNING, "I2C write failed\n");
|
|
return -EREMOTEIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Reads a single register */
|
|
static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
|
|
{
|
|
u32 wval;
|
|
u8 buf[3];
|
|
int ret;
|
|
struct i2c_msg msg[] = {
|
|
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
|
|
.buf = buf, .len = 3 },
|
|
};
|
|
|
|
wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(reg, MC44S803_D);
|
|
|
|
ret = mc44s803_writereg(priv, wval);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (i2c_transfer(priv->i2c, msg, 1) != 1) {
|
|
mc_printk(KERN_WARNING, "I2C read failed\n");
|
|
return -EREMOTEIO;
|
|
}
|
|
|
|
*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mc44s803_release(struct dvb_frontend *fe)
|
|
{
|
|
struct mc44s803_priv *priv = fe->tuner_priv;
|
|
|
|
fe->tuner_priv = NULL;
|
|
kfree(priv);
|
|
}
|
|
|
|
static int mc44s803_init(struct dvb_frontend *fe)
|
|
{
|
|
struct mc44s803_priv *priv = fe->tuner_priv;
|
|
u32 val;
|
|
int err;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1);
|
|
|
|
/* Reset chip */
|
|
val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_RS);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Power Up and Start Osc */
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
|
|
MC44S803_REG_SM(1, MC44S803_OSCSEL);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(0x200, MC44S803_POWER);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
msleep(10);
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
|
|
MC44S803_REG_SM(1, MC44S803_OSCSEL);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
msleep(20);
|
|
|
|
/* Setup Mixer */
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
|
|
MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Setup Cirquit Adjust */
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_G1) |
|
|
MC44S803_REG_SM(1, MC44S803_G3) |
|
|
MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
|
|
MC44S803_REG_SM(1, MC44S803_G6) |
|
|
MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
|
|
MC44S803_REG_SM(0x3, MC44S803_LP) |
|
|
MC44S803_REG_SM(1, MC44S803_CLRF) |
|
|
MC44S803_REG_SM(1, MC44S803_CLIF);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_G1) |
|
|
MC44S803_REG_SM(1, MC44S803_G3) |
|
|
MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
|
|
MC44S803_REG_SM(1, MC44S803_G6) |
|
|
MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
|
|
MC44S803_REG_SM(0x3, MC44S803_LP);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Setup Digtune */
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(3, MC44S803_XOD);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Setup AGC */
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_AT1) |
|
|
MC44S803_REG_SM(1, MC44S803_AT2) |
|
|
MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
|
|
MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
|
|
MC44S803_REG_SM(1, MC44S803_LNA0);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0);
|
|
return 0;
|
|
|
|
exit:
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0);
|
|
|
|
mc_printk(KERN_WARNING, "I/O Error\n");
|
|
return err;
|
|
}
|
|
|
|
static int mc44s803_set_params(struct dvb_frontend *fe)
|
|
{
|
|
struct mc44s803_priv *priv = fe->tuner_priv;
|
|
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
|
|
u32 r1, r2, n1, n2, lo1, lo2, freq, val;
|
|
int err;
|
|
|
|
priv->frequency = c->frequency;
|
|
|
|
r1 = MC44S803_OSC / 1000000;
|
|
r2 = MC44S803_OSC / 100000;
|
|
|
|
n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
|
|
freq = MC44S803_OSC / r1 * n1;
|
|
lo1 = ((60 * n1) + (r1 / 2)) / r1;
|
|
freq = freq - c->frequency;
|
|
|
|
n2 = (freq - MC44S803_IF2 + 50000) / 100000;
|
|
lo2 = ((60 * n2) + (r2 / 2)) / r2;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1);
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(r1-1, MC44S803_R1) |
|
|
MC44S803_REG_SM(r2-1, MC44S803_R2) |
|
|
MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(n1-2, MC44S803_LO1);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(n2-2, MC44S803_LO2);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(1, MC44S803_DA) |
|
|
MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
|
|
MC44S803_REG_SM(1, MC44S803_AT);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
|
|
MC44S803_REG_SM(2, MC44S803_DA) |
|
|
MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
|
|
MC44S803_REG_SM(1, MC44S803_AT);
|
|
|
|
err = mc44s803_writereg(priv, val);
|
|
if (err)
|
|
goto exit;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0);
|
|
|
|
return 0;
|
|
|
|
exit:
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0);
|
|
|
|
mc_printk(KERN_WARNING, "I/O Error\n");
|
|
return err;
|
|
}
|
|
|
|
static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
|
|
{
|
|
struct mc44s803_priv *priv = fe->tuner_priv;
|
|
*frequency = priv->frequency;
|
|
return 0;
|
|
}
|
|
|
|
static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
|
|
{
|
|
*frequency = MC44S803_IF2; /* 36.125 MHz */
|
|
return 0;
|
|
}
|
|
|
|
static const struct dvb_tuner_ops mc44s803_tuner_ops = {
|
|
.info = {
|
|
.name = "Freescale MC44S803",
|
|
.frequency_min = 48000000,
|
|
.frequency_max = 1000000000,
|
|
.frequency_step = 100000,
|
|
},
|
|
|
|
.release = mc44s803_release,
|
|
.init = mc44s803_init,
|
|
.set_params = mc44s803_set_params,
|
|
.get_frequency = mc44s803_get_frequency,
|
|
.get_if_frequency = mc44s803_get_if_frequency,
|
|
};
|
|
|
|
/* This functions tries to identify a MC44S803 tuner by reading the ID
|
|
register. This is hasty. */
|
|
struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
|
|
struct i2c_adapter *i2c, struct mc44s803_config *cfg)
|
|
{
|
|
struct mc44s803_priv *priv;
|
|
u32 reg;
|
|
u8 id;
|
|
int ret;
|
|
|
|
reg = 0;
|
|
|
|
priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
|
|
if (priv == NULL)
|
|
return NULL;
|
|
|
|
priv->cfg = cfg;
|
|
priv->i2c = i2c;
|
|
priv->fe = fe;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
|
|
|
|
ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®);
|
|
if (ret)
|
|
goto error;
|
|
|
|
id = MC44S803_REG_MS(reg, MC44S803_ID);
|
|
|
|
if (id != 0x14) {
|
|
mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
|
|
id);
|
|
goto error;
|
|
}
|
|
|
|
mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
|
|
memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
|
|
sizeof(struct dvb_tuner_ops));
|
|
|
|
fe->tuner_priv = priv;
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
|
|
|
|
return fe;
|
|
|
|
error:
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
|
|
|
|
kfree(priv);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(mc44s803_attach);
|
|
|
|
MODULE_AUTHOR("Jochen Friedrich");
|
|
MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
|
|
MODULE_LICENSE("GPL");
|