linux-imx

/*

 * Regulator driver for PWM Regulators

 *

 * Copyright (C) 2014 - STMicroelectronics Inc.

 *

 * Author: Lee Jones <lee.jones@linaro.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/regulator/of_regulator.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/pwm.h>

#include <linux/gpio/consumer.h>

​

struct pwm_continuous_reg_data {

    unsigned int min_uV_dutycycle;

    unsigned int max_uV_dutycycle;

    unsigned int dutycycle_unit;

};

​

struct pwm_regulator_data {

    /*  Shared */

    struct pwm_device *pwm;

​

    /* Voltage table */

    struct pwm_voltages *duty_cycle_table;

​

    /* Continuous mode info */

    struct pwm_continuous_reg_data continuous;

​

    /* regulator descriptor */

    struct regulator_desc desc;

​

    int state;

​

    /* Enable GPIO */

    struct gpio_desc *enb_gpio;

};

​

struct pwm_voltages {

    unsigned int uV;

    unsigned int dutycycle;

};

​

/**

 * Voltage table call-backs

 */

static void pwm_regulator_init_state(struct regulator_dev *rdev)

{

    struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

    struct pwm_state pwm_state;

    unsigned int dutycycle;

    int i;

​

    pwm_get_state(drvdata->pwm, &pwm_state);

    dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);

​

    for (i = 0; i < rdev->desc->n_voltages; i++) {

        if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {

            drvdata->state = i;

            return;

        }

    }

}

​

static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)

{

    struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

​

    if (drvdata->state < 0)

        pwm_regulator_init_state(rdev);

​

    return drvdata->state;

}

​

static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,

                     unsigned selector)

{

    struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

    struct pwm_state pstate;

    int ret;

​

    pwm_init_state(drvdata->pwm, &pstate);