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