141 lines
3 KiB
C
141 lines
3 KiB
C
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/*
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* Allegro A8293 SEC driver
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*
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* Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "a8293.h"
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struct a8293_dev {
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struct i2c_client *client;
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u8 reg[2];
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};
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static int a8293_set_voltage(struct dvb_frontend *fe,
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enum fe_sec_voltage fe_sec_voltage)
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{
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struct a8293_dev *dev = fe->sec_priv;
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struct i2c_client *client = dev->client;
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int ret;
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u8 reg0, reg1;
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dev_dbg(&client->dev, "fe_sec_voltage=%d\n", fe_sec_voltage);
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switch (fe_sec_voltage) {
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case SEC_VOLTAGE_OFF:
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/* ENB=0 */
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reg0 = 0x10;
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break;
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case SEC_VOLTAGE_13:
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/* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
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reg0 = 0x31;
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break;
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case SEC_VOLTAGE_18:
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/* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
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reg0 = 0x38;
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break;
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default:
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ret = -EINVAL;
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goto err;
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}
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if (reg0 != dev->reg[0]) {
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ret = i2c_master_send(client, ®0, 1);
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if (ret < 0)
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goto err;
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dev->reg[0] = reg0;
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}
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/* TMODE=0, TGATE=1 */
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reg1 = 0x82;
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if (reg1 != dev->reg[1]) {
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ret = i2c_master_send(client, ®1, 1);
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if (ret < 0)
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goto err;
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dev->reg[1] = reg1;
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}
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usleep_range(1500, 50000);
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return 0;
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err:
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dev_dbg(&client->dev, "failed=%d\n", ret);
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return ret;
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}
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static int a8293_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct a8293_dev *dev;
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struct a8293_platform_data *pdata = client->dev.platform_data;
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struct dvb_frontend *fe = pdata->dvb_frontend;
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int ret;
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u8 buf[2];
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev) {
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ret = -ENOMEM;
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goto err;
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}
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dev->client = client;
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/* check if the SEC is there */
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ret = i2c_master_recv(client, buf, 2);
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if (ret < 0)
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goto err_kfree;
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/* override frontend ops */
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fe->ops.set_voltage = a8293_set_voltage;
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fe->sec_priv = dev;
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i2c_set_clientdata(client, dev);
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dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n");
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return 0;
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err_kfree:
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kfree(dev);
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err:
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dev_dbg(&client->dev, "failed=%d\n", ret);
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return ret;
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}
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static int a8293_remove(struct i2c_client *client)
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{
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struct a8293_dev *dev = i2c_get_clientdata(client);
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dev_dbg(&client->dev, "\n");
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kfree(dev);
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return 0;
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}
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static const struct i2c_device_id a8293_id_table[] = {
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{"a8293", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, a8293_id_table);
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static struct i2c_driver a8293_driver = {
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.driver = {
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.name = "a8293",
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.suppress_bind_attrs = true,
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},
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.probe = a8293_probe,
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.remove = a8293_remove,
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.id_table = a8293_id_table,
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};
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module_i2c_driver(a8293_driver);
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MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
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MODULE_DESCRIPTION("Allegro A8293 SEC driver");
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MODULE_LICENSE("GPL");
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