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pmic_external.c

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/*
 * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

/*!
 * @file pmic_external.c
 * @brief This file contains all external functions of PMIC drivers.
 *
 * @ingroup PMIC_CORE
 */

/*
 * Includes
 */
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/init.h>
#include <linux/errno.h>

#include <linux/pmic_external.h>
#include <linux/pmic_status.h>

/*
 * External Functions
 */
extern int pmic_read(int reg_num, unsigned int *reg_val);
extern int pmic_write(int reg_num, const unsigned int reg_val);

/*!
 * This function is called by PMIC clients to read a register on PMIC.
 *
 * @param        reg        number of register
 * @param        reg_value  return value of register
 * @param        reg_mask   Bitmap mask indicating which bits to modify
 *
 * @return       This function returns PMIC_SUCCESS if successful.
 */
00048 PMIC_STATUS pmic_read_reg(int reg, unsigned int *reg_value,
                    unsigned int reg_mask)
{
      int ret = 0;
      unsigned int temp = 0;

      ret = pmic_read(reg, &temp);
      if (ret != PMIC_SUCCESS) {
            return PMIC_ERROR;
      }
      *reg_value = (temp & reg_mask);

      pr_debug("Read REG[ %d ] = 0x%x\n", reg, *reg_value);

      return ret;
}

/*!
 * This function is called by PMIC clients to write a register on PMIC.
 *
 * @param        reg        number of register
 * @param        reg_value  New value of register
 * @param        reg_mask   Bitmap mask indicating which bits to modify
 *
 * @return       This function returns PMIC_SUCCESS if successful.
 */
00074 PMIC_STATUS pmic_write_reg(int reg, unsigned int reg_value,
                     unsigned int reg_mask)
{
      int ret = 0;
      unsigned int temp = 0;

      ret = pmic_read(reg, &temp);
      if (ret != PMIC_SUCCESS) {
            return PMIC_ERROR;
      }
      temp = (temp & (~reg_mask)) | reg_value;
#ifdef CONFIG_MXC_PMIC_MC13783
      if (reg == REG_POWER_MISCELLANEOUS)
            temp &= 0xFFFE7FFF;
#endif
      ret = pmic_write(reg, temp);
      if (ret != PMIC_SUCCESS) {
            return PMIC_ERROR;
      }

      pr_debug("Write REG[ %d ] = 0x%x\n", reg, reg_value);

      return ret;
}

EXPORT_SYMBOL(pmic_read_reg);
EXPORT_SYMBOL(pmic_write_reg);

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