/*
   * lnbp22.h - driver for lnb supply and control ic lnbp22
   *
   * Copyright (C) 2006 Dominik Kuhlen
   * Based on lnbp21 driver
   *
   * 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/moduleparam.h>
  #include <linux/string.h>
  #include <linux/slab.h>
  
  #include "dvb_frontend.h"
  #include "lnbp22.h"
  
  static int debug;
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  
  
  #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
  
  struct lnbp22 {
  	u8		    config[4];
  	struct i2c_adapter *i2c;
  };
  
  static int lnbp22_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage)
  {
  	struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
  	struct i2c_msg msg = {
  		.addr = 0x08,
  		.flags = 0,
  		.buf = (char *)&lnbp22->config,
  		.len = sizeof(lnbp22->config),
  	};
  
  	dprintk(1, "%s: %d (18V=%d 13V=%d)
  ", __func__, voltage,
  	       SEC_VOLTAGE_18, SEC_VOLTAGE_13);
  
  	lnbp22->config[3] = 0x60; /* Power down */
  	switch (voltage) {
  	case SEC_VOLTAGE_OFF:
  		break;
  	case SEC_VOLTAGE_13:
  		lnbp22->config[3] |= LNBP22_EN;
  		break;
  	case SEC_VOLTAGE_18:
  		lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	dprintk(1, "%s: 0x%02x)
  ", __func__, lnbp22->config[3]);
  	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  }
  
  static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  {
  	struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
  	struct i2c_msg msg = {
  		.addr = 0x08,
  		.flags = 0,
  		.buf = (char *)&lnbp22->config,
  		.len = sizeof(lnbp22->config),
  	};
  
  	dprintk(1, "%s: %d
  ", __func__, (int)arg);
  	if (arg)
  		lnbp22->config[3] |= LNBP22_LLC;
  	else
  		lnbp22->config[3] &= ~LNBP22_LLC;
  
  	return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  }
  
  static void lnbp22_release(struct dvb_frontend *fe)
  {
  	dprintk(1, "%s
  ", __func__);
  	/* LNBP power off */
  	lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
  
  	/* free data */
  	kfree(fe->sec_priv);
  	fe->sec_priv = NULL;
  }
  
  struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
  					struct i2c_adapter *i2c)
  {
  	struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
  	if (!lnbp22)
  		return NULL;
  
  	/* default configuration */
  	lnbp22->config[0] = 0x00; /* ? */
  	lnbp22->config[1] = 0x28; /* ? */
  	lnbp22->config[2] = 0x48; /* ? */
  	lnbp22->config[3] = 0x60; /* Power down */
  	lnbp22->i2c = i2c;
  	fe->sec_priv = lnbp22;
  
  	/* detect if it is present or not */
  	if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
  		dprintk(0, "%s LNBP22 not found
  ", __func__);
  		kfree(lnbp22);
  		fe->sec_priv = NULL;
  		return NULL;
  	}
  
  	/* install release callback */
  	fe->ops.release_sec = lnbp22_release;
  
  	/* override frontend ops */
  	fe->ops.set_voltage = lnbp22_set_voltage;
  	fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
  
  	return fe;
  }
  EXPORT_SYMBOL(lnbp22_attach);
  
  MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
  MODULE_AUTHOR("Dominik Kuhlen");
  MODULE_LICENSE("GPL");