linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * AS3711 PMIC backlight driver, using DCDC Step Up Converters

 *

 * Copyright (C) 2012 Renesas Electronics Corporation

 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>

 */

​

#include <linux/backlight.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/fb.h>

#include <linux/kernel.h>

#include <linux/mfd/as3711.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

​

enum as3711_bl_type {

    AS3711_BL_SU1,

    AS3711_BL_SU2,

};

​

struct as3711_bl_data {

    bool powered;

    enum as3711_bl_type type;

    int brightness;

    struct backlight_device *bl;

};

​

struct as3711_bl_supply {

    struct as3711_bl_data su1;

    struct as3711_bl_data su2;

    const struct as3711_bl_pdata *pdata;

    struct as3711 *as3711;

};

​

static struct as3711_bl_supply *to_supply(struct as3711_bl_data *su)

{

    switch (su->type) {

    case AS3711_BL_SU1:

        return container_of(su, struct as3711_bl_supply, su1);

    case AS3711_BL_SU2:

        return container_of(su, struct as3711_bl_supply, su2);

    }

    return NULL;

}

​

static int as3711_set_brightness_auto_i(struct as3711_bl_data *data,

                    unsigned int brightness)

{

    struct as3711_bl_supply *supply = to_supply(data);

    struct as3711 *as3711 = supply->as3711;

    const struct as3711_bl_pdata *pdata = supply->pdata;

    int ret = 0;

​

    /* Only all equal current values are supported */

    if (pdata->su2_auto_curr1)

        ret = regmap_write(as3711->regmap, AS3711_CURR1_VALUE,

                   brightness);

    if (!ret && pdata->su2_auto_curr2)

        ret = regmap_write(as3711->regmap, AS3711_CURR2_VALUE,

                   brightness);

    if (!ret && pdata->su2_auto_curr3)

        ret = regmap_write(as3711->regmap, AS3711_CURR3_VALUE,

                   brightness);

​

    return ret;

}

​

static int as3711_set_brightness_v(struct as3711 *as3711,

                   unsigned int brightness,

                   unsigned int reg)

{

    if (brightness > 31)

        return -EINVAL;

​

    return regmap_update_bits(as3711->regmap, reg, 0xf0,

                  brightness << 4);

}

​

static int as3711_bl_su2_reset(struct as3711_bl_supply *supply)

{

    struct as3711 *as3711 = supply->as3711;

    int ret = regmap_update_bits(as3711->regmap, AS3711_STEPUP_CONTROL_5,

                     3, supply->pdata->su2_fbprot);

    if (!ret)

        ret = regmap_update_bits(as3711->regmap,

                     AS3711_STEPUP_CONTROL_2, 1, 0);

    if (!ret)