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[media] a8293: Allegro A8293 SEC driver
Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari
Mauro Carvalho Chehab
parent
88365105d6
commit
85bc9b510a
4 changed files with 231 additions and 0 deletions
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@ -621,6 +621,11 @@ config DVB_ISL6423
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help
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A SEC controller chip from Intersil
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config DVB_A8293
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tristate "Allegro A8293"
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depends on DVB_CORE && I2C
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default m if DVB_FE_CUSTOMISE
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config DVB_LGS8GL5
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tristate "Silicon Legend LGS-8GL5 demodulator (OFDM)"
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depends on DVB_CORE && I2C
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@ -92,4 +92,5 @@ obj-$(CONFIG_DVB_CXD2820R) += cxd2820r.o
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obj-$(CONFIG_DVB_DRXK) += drxk.o
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obj-$(CONFIG_DVB_TDA18271C2DD) += tda18271c2dd.o
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obj-$(CONFIG_DVB_IT913X_FE) += it913x-fe.o
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obj-$(CONFIG_DVB_A8293) += a8293.o
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184
drivers/media/dvb/frontends/a8293.c
Normal file
184
drivers/media/dvb/frontends/a8293.c
Normal file
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@ -0,0 +1,184 @@
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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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* 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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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
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#define LOG_PREFIX "a8293"
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#undef dbg
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#define dbg(f, arg...) \
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if (debug) \
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printk(KERN_INFO LOG_PREFIX": " f "\n" , ## arg)
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#undef err
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#define err(f, arg...) printk(KERN_ERR LOG_PREFIX": " f "\n" , ## arg)
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#undef info
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#define info(f, arg...) printk(KERN_INFO LOG_PREFIX": " f "\n" , ## arg)
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#undef warn
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#define warn(f, arg...) printk(KERN_WARNING LOG_PREFIX": " f "\n" , ## arg)
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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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warn("i2c failed=%d rd=%d", 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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dbg("%s: fe_sec_voltage=%d", __func__, 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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dbg("%s: failed=%d", __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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dbg("%s:", __func__);
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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[1], 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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info("Allegro A8293 SEC attached.");
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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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return fe;
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err:
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dbg("%s: failed=%d", __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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41
drivers/media/dvb/frontends/a8293.h
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41
drivers/media/dvb/frontends/a8293.h
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@ -0,0 +1,41 @@
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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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* 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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#ifndef A8293_H
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#define A8293_H
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struct a8293_config {
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u8 i2c_addr;
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};
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#if defined(CONFIG_DVB_A8293) || \
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(defined(CONFIG_DVB_A8293_MODULE) && defined(MODULE))
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extern 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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#else
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static inline 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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printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
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return NULL;
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}
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#endif
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#endif /* A8293_H */
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