linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/* Copyright (c) 2013, The Linux Foundation. All rights reserved.

 * Copyright (c) 2015, Sony Mobile Communications Inc.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/regmap.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

​

struct qcom_coincell {

    struct device   *dev;

    struct regmap   *regmap;

    u32     base_addr;

};

​

#define QCOM_COINCELL_REG_RSET      0x44

#define QCOM_COINCELL_REG_VSET      0x45

#define QCOM_COINCELL_REG_ENABLE    0x46

​

#define QCOM_COINCELL_ENABLE        BIT(7)

​

static const int qcom_rset_map[] = { 2100, 1700, 1200, 800 };

static const int qcom_vset_map[] = { 2500, 3200, 3100, 3000 };

/* NOTE: for pm8921 and others, voltage of 2500 is 16 (10000b), not 0 */

​

/* if enable==0, rset and vset are ignored */

static int qcom_coincell_chgr_config(struct qcom_coincell *chgr, int rset,

                     int vset, bool enable)

{

    int i, j, rc;

​

    /* if disabling, just do that and skip other operations */

    if (!enable)

        return regmap_write(chgr->regmap,

              chgr->base_addr + QCOM_COINCELL_REG_ENABLE, 0);

​

    /* find index for current-limiting resistor */

    for (i = 0; i < ARRAY_SIZE(qcom_rset_map); i++)

        if (rset == qcom_rset_map[i])

            break;

​

    if (i >= ARRAY_SIZE(qcom_rset_map)) {

        dev_err(chgr->dev, "invalid rset-ohms value %d\n", rset);

        return -EINVAL;

    }

​

    /* find index for charge voltage */

    for (j = 0; j < ARRAY_SIZE(qcom_vset_map); j++)

        if (vset == qcom_vset_map[j])

            break;

​

    if (j >= ARRAY_SIZE(qcom_vset_map)) {

        dev_err(chgr->dev, "invalid vset-millivolts value %d\n", vset);

        return -EINVAL;

    }

​

    rc = regmap_write(chgr->regmap,

              chgr->base_addr + QCOM_COINCELL_REG_RSET, i);

    if (rc) {