a8293.c
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/*
* Allegro A8293 SEC driver
*
* Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "dvb_frontend.h"
#include "a8293.h"
struct a8293_priv {
struct i2c_adapter *i2c;
const struct a8293_config *cfg;
u8 reg[2];
};
static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd)
{
int ret;
struct i2c_msg msg[1] = {
{
.addr = priv->cfg->i2c_addr,
.len = len,
.buf = val,
}
};
if (rd)
msg[0].flags = I2C_M_RD;
else
msg[0].flags = 0;
ret = i2c_transfer(priv->i2c, msg, 1);
if (ret == 1) {
ret = 0;
} else {
dev_warn(&priv->i2c->dev, "%s: i2c failed=%d rd=%d\n",
KBUILD_MODNAME, ret, rd);
ret = -EREMOTEIO;
}
return ret;
}
static int a8293_wr(struct a8293_priv *priv, u8 *val, int len)
{
return a8293_i2c(priv, val, len, 0);
}
static int a8293_rd(struct a8293_priv *priv, u8 *val, int len)
{
return a8293_i2c(priv, val, len, 1);
}
static int a8293_set_voltage(struct dvb_frontend *fe,
fe_sec_voltage_t fe_sec_voltage)
{
struct a8293_priv *priv = fe->sec_priv;
int ret;
dev_dbg(&priv->i2c->dev, "%s: fe_sec_voltage=%d\n", __func__,
fe_sec_voltage);
switch (fe_sec_voltage) {
case SEC_VOLTAGE_OFF:
/* ENB=0 */
priv->reg[0] = 0x10;
break;
case SEC_VOLTAGE_13:
/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
priv->reg[0] = 0x31;
break;
case SEC_VOLTAGE_18:
/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
priv->reg[0] = 0x38;
break;
default:
ret = -EINVAL;
goto err;
}
ret = a8293_wr(priv, &priv->reg[0], 1);
if (ret)
goto err;
usleep_range(1500, 50000);
return ret;
err:
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static void a8293_release_sec(struct dvb_frontend *fe)
{
a8293_set_voltage(fe, SEC_VOLTAGE_OFF);
kfree(fe->sec_priv);
fe->sec_priv = NULL;
}
struct dvb_frontend *a8293_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, const struct a8293_config *cfg)
{
int ret;
struct a8293_priv *priv = NULL;
u8 buf[2];
/* allocate memory for the internal priv */
priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL);
if (priv == NULL) {
ret = -ENOMEM;
goto err;
}
/* setup the priv */
priv->i2c = i2c;
priv->cfg = cfg;
fe->sec_priv = priv;
/* check if the SEC is there */
ret = a8293_rd(priv, buf, 2);
if (ret)
goto err;
/* ENB=0 */
priv->reg[0] = 0x10;
ret = a8293_wr(priv, &priv->reg[0], 1);
if (ret)
goto err;
/* TMODE=0, TGATE=1 */
priv->reg[1] = 0x82;
ret = a8293_wr(priv, &priv->reg[1], 1);
if (ret)
goto err;
fe->ops.release_sec = a8293_release_sec;
/* override frontend ops */
fe->ops.set_voltage = a8293_set_voltage;
dev_info(&priv->i2c->dev, "%s: Allegro A8293 SEC attached\n",
KBUILD_MODNAME);
return fe;
err:
dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
kfree(priv);
return NULL;
}
EXPORT_SYMBOL(a8293_attach);
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Allegro A8293 SEC driver");
MODULE_LICENSE("GPL");