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/*
* Driver for Zarlink ZL10039 DVB-S tuner
*
* Copyright 2007 Jan D. Louw <jd.louw@mweb.co.za>
*
* 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/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/dvb/frontend.h>
#include <media/dvb_frontend.h>
#include "zl10039.h"
static int debug;
/* Max transfer size done by I2C transfer functions */
#define MAX_XFER_SIZE 64
#define dprintk(args...) \
do { \
if (debug) \
printk(KERN_DEBUG args); \
} while (0)
enum zl10039_model_id {
ID_ZL10039 = 1
};
struct zl10039_state {
struct i2c_adapter *i2c;
u8 i2c_addr;
u8 id;
};
enum zl10039_reg_addr {
PLL0 = 0,
PLL1,
PLL2,
PLL3,
RFFE,
BASE0,
BASE1,
BASE2,
LO0,
LO1,
LO2,
LO3,
LO4,
LO5,
LO6,
GENERAL
};
static int zl10039_read(const struct zl10039_state *state,
const enum zl10039_reg_addr reg, u8 *buf,
const size_t count)
{
u8 regbuf[] = { reg };
struct i2c_msg msg[] = {
{/* Write register address */
.addr = state->i2c_addr,
.flags = 0,
.buf = regbuf,
.len = 1,
}, {/* Read count bytes */
.addr = state->i2c_addr,
.flags = I2C_M_RD,
.buf = buf,
.len = count,
},
};
dprintk("%s\n", __func__);
if (i2c_transfer(state->i2c, msg, 2) != 2) {
dprintk("%s: i2c read error\n", __func__);
return -EREMOTEIO;
}
return 0; /* Success */
}
static int zl10039_write(struct zl10039_state *state,
const enum zl10039_reg_addr reg, const u8 *src,
const size_t count)
{
u8 buf[MAX_XFER_SIZE];
struct i2c_msg msg = {
.addr = state->i2c_addr,
.flags = 0,
.buf = buf,
.len = count + 1,
};
if (1 + count > sizeof(buf)) {
printk(KERN_WARNING
"%s: i2c wr reg=%04x: len=%zu is too big!\n",
KBUILD_MODNAME, reg, count);
return -EINVAL;
}
dprintk("%s\n", __func__);
/* Write register address and data in one go */
buf[0] = reg;
memcpy(&buf[1], src, count);
if (i2c_transfer(state->i2c, &msg, 1) != 1) {
dprintk("%s: i2c write error\n", __func__);
return -EREMOTEIO;
}
return 0; /* Success */
}
static inline int zl10039_readreg(struct zl10039_state *state,
const enum zl10039_reg_addr reg, u8 *val)
{
return zl10039_read(state, reg, val, 1);
}
static inline int zl10039_writereg(struct zl10039_state *state,
const enum zl10039_reg_addr reg,
const u8 val)
{
const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
return zl10039_write(state, reg, &tmp, 1);
}
static int zl10039_init(struct dvb_frontend *fe)
{
struct zl10039_state *state = fe->tuner_priv;
int ret;
dprintk("%s\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
/* Reset logic */
ret = zl10039_writereg(state, GENERAL, 0x40);
if (ret < 0) {
dprintk("Note: i2c write error normal when resetting the tuner\n");
}
/* Wake up */
ret = zl10039_writereg(state, GENERAL, 0x01);
if (ret < 0) {
dprintk("Tuner power up failed\n");
return ret;
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return 0;
}
static int zl10039_sleep(struct dvb_frontend *fe)
{
struct zl10039_state *state = fe->tuner_priv;
int ret;
dprintk("%s\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
ret = zl10039_writereg(state, GENERAL, 0x80);
if (ret < 0) {
dprintk("Tuner sleep failed\n");
return ret;
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return 0;
}
static int zl10039_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct zl10039_state *state = fe->tuner_priv;
u8 buf[6];
u8 bf;
u32 fbw;
u32 div;
int ret;
dprintk("%s\n", __func__);
dprintk("Set frequency = %d, symbol rate = %d\n",
c->frequency, c->symbol_rate);
/* Assumed 10.111 MHz crystal oscillator */
/* Cancelled num/den 80 to prevent overflow */
div = (c->frequency * 1000) / 126387;
fbw = (c->symbol_rate * 27) / 32000;
/* Cancelled num/den 10 to prevent overflow */
bf = ((fbw * 5088) / 1011100) - 1;
/*PLL divider*/
buf[0] = (div >> 8) & 0x7f;
buf[1] = (div >> 0) & 0xff;
/*Reference divider*/
/* Select reference ratio of 80 */
buf[2] = 0x1D;
/*PLL test modes*/
buf[3] = 0x40;
/*RF Control register*/
buf[4] = 0x6E; /* Bypass enable */
/*Baseband filter cutoff */
buf[5] = bf;
/* Open i2c gate */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
/* BR = 10, Enable filter adjustment */
ret = zl10039_writereg(state, BASE1, 0x0A);
if (ret < 0)
goto error;
/* Write new config values */
ret = zl10039_write(state, PLL0, buf, sizeof(buf));
if (ret < 0)
goto error;
/* BR = 10, Disable filter adjustment */
ret = zl10039_writereg(state, BASE1, 0x6A);
if (ret < 0)
goto error;
/* Close i2c gate */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return 0;
error:
dprintk("Error setting tuner\n");
return ret;
}
static void zl10039_release(struct dvb_frontend *fe)
{
struct zl10039_state *state = fe->tuner_priv;
dprintk("%s\n", __func__);
kfree(state);
fe->tuner_priv = NULL;
}
static const struct dvb_tuner_ops zl10039_ops = {
.release = zl10039_release,
.init = zl10039_init,
.sleep = zl10039_sleep,
.set_params = zl10039_set_params,
};
struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe,
u8 i2c_addr, struct i2c_adapter *i2c)
{
struct zl10039_state *state = NULL;
dprintk("%s\n", __func__);
state = kmalloc(sizeof(struct zl10039_state), GFP_KERNEL);
if (state == NULL)
goto error;
state->i2c = i2c;
state->i2c_addr = i2c_addr;
/* Open i2c gate */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
/* check if this is a valid tuner */
if (zl10039_readreg(state, GENERAL, &state->id) < 0) {
/* Close i2c gate */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
goto error;
}
/* Close i2c gate */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
state->id = state->id & 0x0f;
switch (state->id) {
case ID_ZL10039:
strcpy(fe->ops.tuner_ops.info.name,
"Zarlink ZL10039 DVB-S tuner");
break;
default:
dprintk("Chip ID=%x does not match a known type\n", state->id);
goto error;
}
memcpy(&fe->ops.tuner_ops, &zl10039_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = state;
dprintk("Tuner attached @ i2c address 0x%02x\n", i2c_addr);
return fe;
error:
kfree(state);
return NULL;
}
EXPORT_SYMBOL(zl10039_attach);
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("Zarlink ZL10039 DVB-S tuner driver");
MODULE_AUTHOR("Jan D. Louw <jd.louw@mweb.co.za>");
MODULE_LICENSE("GPL");
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