linux-imx

/*

 * I2C access for DA9052 PMICs.

 *

 * Copyright(c) 2011 Dialog Semiconductor Ltd.

 *

 * Author: David Dajun Chen <dchen@diasemi.com>

 *

 * 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.

 *

 */

​

#include <linux/device.h>

#include <linux/module.h>

#include <linux/input.h>

#include <linux/mfd/core.h>

#include <linux/i2c.h>

#include <linux/err.h>

​

#include <linux/mfd/da9052/da9052.h>

#include <linux/mfd/da9052/reg.h>

​

#ifdef CONFIG_OF

#include <linux/of.h>

#include <linux/of_device.h>

#endif

​

/* I2C safe register check */

static inline bool i2c_safe_reg(unsigned char reg)

{

    switch (reg) {

    case DA9052_STATUS_A_REG:

    case DA9052_STATUS_B_REG:

    case DA9052_STATUS_C_REG:

    case DA9052_STATUS_D_REG:

    case DA9052_ADC_RES_L_REG:

    case DA9052_ADC_RES_H_REG:

    case DA9052_VDD_RES_REG:

    case DA9052_ICHG_AV_REG:

    case DA9052_TBAT_RES_REG:

    case DA9052_ADCIN4_RES_REG:

    case DA9052_ADCIN5_RES_REG:

    case DA9052_ADCIN6_RES_REG:

    case DA9052_TJUNC_RES_REG:

    case DA9052_TSI_X_MSB_REG:

    case DA9052_TSI_Y_MSB_REG:

    case DA9052_TSI_LSB_REG:

    case DA9052_TSI_Z_MSB_REG:

        return true;

    default:

        return false;

    }

}

​

/*

 * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC

 * gets lockup up or fails to respond following a system reset.

 * This fix is to follow any read or write with a dummy read to a safe

 * register.

 */

static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)