2015-07-28 08:33:02 -06:00
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/*
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* lnbh25.c
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*
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* Driver for LNB supply and control IC LNBH25
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*
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* Copyright (C) 2014 NetUP Inc.
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* Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru>
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* Copyright (C) 2014 Abylay Ospan <aospan@netup.ru>
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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 <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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2017-12-28 11:03:51 -07:00
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#include <media/dvb_frontend.h>
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2015-07-28 08:33:02 -06:00
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#include "lnbh25.h"
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/**
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* struct lnbh25_priv - LNBH25 driver private data
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* @i2c: pointer to the I2C adapter structure
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* @i2c_address: I2C address of LNBH25 SEC chip
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* @config: Registers configuration:
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* offset 0: 1st register address, always 0x02 (DATA1)
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* offset 1: DATA1 register value
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* offset 2: DATA2 register value
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*/
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struct lnbh25_priv {
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struct i2c_adapter *i2c;
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u8 i2c_address;
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u8 config[3];
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};
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#define LNBH25_STATUS_OFL 0x1
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#define LNBH25_STATUS_VMON 0x4
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#define LNBH25_VSEL_13 0x03
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#define LNBH25_VSEL_18 0x0a
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static int lnbh25_read_vmon(struct lnbh25_priv *priv)
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{
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int i, ret;
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u8 addr = 0x00;
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u8 status[6];
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struct i2c_msg msg[2] = {
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{
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.addr = priv->i2c_address,
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.flags = 0,
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.len = 1,
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.buf = &addr
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}, {
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.addr = priv->i2c_address,
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.flags = I2C_M_RD,
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.len = sizeof(status),
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.buf = status
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}
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};
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for (i = 0; i < 2; i++) {
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ret = i2c_transfer(priv->i2c, &msg[i], 1);
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if (ret >= 0 && ret != 1)
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ret = -EIO;
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if (ret < 0) {
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dev_dbg(&priv->i2c->dev,
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"%s(): I2C transfer %d failed (%d)\n",
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__func__, i, ret);
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return ret;
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}
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}
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2017-06-20 13:57:24 -06:00
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dev_dbg(&priv->i2c->dev, "%s(): %*ph\n",
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__func__, (int) sizeof(status), status);
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2015-07-28 08:33:02 -06:00
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if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) {
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dev_err(&priv->i2c->dev,
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"%s(): voltage in failure state, status reg 0x%x\n",
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__func__, status[0]);
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return -EIO;
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}
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return 0;
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}
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static int lnbh25_set_voltage(struct dvb_frontend *fe,
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enum fe_sec_voltage voltage)
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{
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int ret;
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u8 data1_reg;
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const char *vsel;
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struct lnbh25_priv *priv = fe->sec_priv;
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struct i2c_msg msg = {
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.addr = priv->i2c_address,
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.flags = 0,
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.len = sizeof(priv->config),
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.buf = priv->config
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};
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switch (voltage) {
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case SEC_VOLTAGE_OFF:
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data1_reg = 0x00;
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vsel = "Off";
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break;
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case SEC_VOLTAGE_13:
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data1_reg = LNBH25_VSEL_13;
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vsel = "13V";
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break;
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case SEC_VOLTAGE_18:
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data1_reg = LNBH25_VSEL_18;
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vsel = "18V";
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break;
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default:
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return -EINVAL;
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}
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priv->config[1] = data1_reg;
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dev_dbg(&priv->i2c->dev,
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"%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n",
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__func__, vsel, priv->i2c_address,
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priv->config[0], priv->config[1], priv->config[2]);
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ret = i2c_transfer(priv->i2c, &msg, 1);
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if (ret >= 0 && ret != 1)
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ret = -EIO;
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if (ret < 0) {
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dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n",
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__func__, ret);
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return ret;
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}
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if (voltage != SEC_VOLTAGE_OFF) {
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msleep(120);
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ret = lnbh25_read_vmon(priv);
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} else {
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msleep(20);
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ret = 0;
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}
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return ret;
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}
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static void lnbh25_release(struct dvb_frontend *fe)
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{
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struct lnbh25_priv *priv = fe->sec_priv;
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dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
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lnbh25_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 *lnbh25_attach(struct dvb_frontend *fe,
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struct lnbh25_config *cfg,
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struct i2c_adapter *i2c)
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{
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struct lnbh25_priv *priv;
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dev_dbg(&i2c->dev, "%s()\n", __func__);
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priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL);
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if (!priv)
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return NULL;
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priv->i2c_address = (cfg->i2c_address >> 1);
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priv->i2c = i2c;
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priv->config[0] = 0x02;
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priv->config[1] = 0x00;
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priv->config[2] = cfg->data2_config;
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fe->sec_priv = priv;
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if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) {
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dev_err(&i2c->dev,
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"%s(): no LNBH25 found at I2C addr 0x%02x\n",
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__func__, priv->i2c_address);
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kfree(priv);
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fe->sec_priv = NULL;
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return NULL;
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}
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fe->ops.release_sec = lnbh25_release;
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fe->ops.set_voltage = lnbh25_set_voltage;
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2017-06-20 13:57:24 -06:00
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dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n",
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2015-07-28 08:33:02 -06:00
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__func__, priv->i2c_address);
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return fe;
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}
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EXPORT_SYMBOL(lnbh25_attach);
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MODULE_DESCRIPTION("ST LNBH25 driver");
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MODULE_AUTHOR("info@netup.ru");
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MODULE_LICENSE("GPL");
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