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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 "a8293.h"
struct a8293_dev {
struct i2c_client *client;
u8 reg[2];
};
static int a8293_set_voltage(struct dvb_frontend *fe,
enum fe_sec_voltage fe_sec_voltage)
{
struct a8293_dev *dev = fe->sec_priv;
struct i2c_client *client = dev->client;
int ret;
u8 reg0, reg1;
dev_dbg(&client->dev, "fe_sec_voltage=%d\n", fe_sec_voltage);
switch (fe_sec_voltage) {
case SEC_VOLTAGE_OFF:
/* ENB=0 */
reg0 = 0x10;
break;
case SEC_VOLTAGE_13:
/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
reg0 = 0x31;
break;
case SEC_VOLTAGE_18:
/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
reg0 = 0x38;
break;
default:
ret = -EINVAL;
goto err;
}
if (reg0 != dev->reg[0]) {
ret = i2c_master_send(client, ®0, 1);
if (ret < 0)
goto err;
dev->reg[0] = reg0;
}
/* TMODE=0, TGATE=1 */
reg1 = 0x82;
if (reg1 != dev->reg[1]) {
ret = i2c_master_send(client, ®1, 1);
if (ret < 0)
goto err;
dev->reg[1] = reg1;
}
usleep_range(1500, 50000);
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static int a8293_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct a8293_dev *dev;
struct a8293_platform_data *pdata = client->dev.platform_data;
struct dvb_frontend *fe = pdata->dvb_frontend;
int ret;
u8 buf[2];
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto err;
}
dev->client = client;
/* check if the SEC is there */
ret = i2c_master_recv(client, buf, 2);
if (ret < 0)
goto err_kfree;
/* override frontend ops */
fe->ops.set_voltage = a8293_set_voltage;
fe->sec_priv = dev;
i2c_set_clientdata(client, dev);
dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n");
return 0;
err_kfree:
kfree(dev);
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
return ret;
}
static int a8293_remove(struct i2c_client *client)
{
struct a8293_dev *dev = i2c_get_clientdata(client);
dev_dbg(&client->dev, "\n");
kfree(dev);
return 0;
}
static const struct i2c_device_id a8293_id_table[] = {
{"a8293", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, a8293_id_table);
static struct i2c_driver a8293_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "a8293",
.suppress_bind_attrs = true,
},
.probe = a8293_probe,
.remove = a8293_remove,
.id_table = a8293_id_table,
};
module_i2c_driver(a8293_driver);
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("Allegro A8293 SEC driver");
MODULE_LICENSE("GPL");
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