/*
   * isl6405.c - driver for dual lnb supply and control ic ISL6405
   *
   * Copyright (C) 2008 Hartmut Hackmann
   * Copyright (C) 2006 Oliver Endriss
   *
   * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
   *
   *
   * the project's page is at http://www.linuxtv.org
   */
  #include <linux/delay.h>
  #include <linux/errno.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/string.h>
  #include <linux/slab.h>
  
  #include "dvb_frontend.h"
  #include "isl6405.h"
  
  struct isl6405 {
  	u8			config;
  	u8			override_or;
  	u8			override_and;
  	struct i2c_adapter	*i2c;
  	u8			i2c_addr;
  };
  
  static int isl6405_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  {
  	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
  				.buf = &isl6405->config,
  				.len = sizeof(isl6405->config) };
  
  	if (isl6405->override_or & 0x80) {
  		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
  		switch (voltage) {
  		case SEC_VOLTAGE_OFF:
  			break;
  		case SEC_VOLTAGE_13:
  			isl6405->config |= ISL6405_EN2;
  			break;
  		case SEC_VOLTAGE_18:
  			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
  			break;
  		default:
  			return -EINVAL;
  		}
  	} else {
  		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
  		switch (voltage) {
  		case SEC_VOLTAGE_OFF:
  			break;
  		case SEC_VOLTAGE_13:
  			isl6405->config |= ISL6405_EN1;
  			break;
  		case SEC_VOLTAGE_18:
  			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
  			break;
  		default:
  			return -EINVAL;
  		}
  	}
  	isl6405->config |= isl6405->override_or;
  	isl6405->config &= isl6405->override_and;
  
  	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  }
  
  static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  {
  	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
  				.buf = &isl6405->config,
  				.len = sizeof(isl6405->config) };
  
  	if (isl6405->override_or & 0x80) {
  		if (arg)
  			isl6405->config |= ISL6405_LLC2;
  		else
  			isl6405->config &= ~ISL6405_LLC2;
  	} else {
  		if (arg)
  			isl6405->config |= ISL6405_LLC1;
  		else
  			isl6405->config &= ~ISL6405_LLC1;
  	}
  	isl6405->config |= isl6405->override_or;
  	isl6405->config &= isl6405->override_and;
  
  	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  }
  
  static void isl6405_release(struct dvb_frontend *fe)
  {
  	/* power off */
  	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
  
  	/* free */
  	kfree(fe->sec_priv);
  	fe->sec_priv = NULL;
  }
  
  struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
  				    u8 i2c_addr, u8 override_set, u8 override_clear)
  {
  	struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
  	if (!isl6405)
  		return NULL;
  
  	/* default configuration */
  	if (override_set & 0x80)
  		isl6405->config = ISL6405_ISEL2;
  	else
  		isl6405->config = ISL6405_ISEL1;
  	isl6405->i2c = i2c;
  	isl6405->i2c_addr = i2c_addr;
  	fe->sec_priv = isl6405;
  
  	/* bits which should be forced to '1' */
  	isl6405->override_or = override_set;
  
  	/* bits which should be forced to '0' */
  	isl6405->override_and = ~override_clear;
  
  	/* detect if it is present or not */
  	if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
  		kfree(isl6405);
  		fe->sec_priv = NULL;
  		return NULL;
  	}
  
  	/* install release callback */
  	fe->ops.release_sec = isl6405_release;
  
  	/* override frontend ops */
  	fe->ops.set_voltage = isl6405_set_voltage;
  	fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
  
  	return fe;
  }
  EXPORT_SYMBOL(isl6405_attach);
  
  MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
  MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
  MODULE_LICENSE("GPL");