linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * MAX1600 PCMCIA power switch library

 *

 * Copyright (C) 2016 Russell King

 */

#include <linux/device.h>

#include <linux/module.h>

#include <linux/gpio/consumer.h>

#include <linux/slab.h>

#include "max1600.h"

​

static const char *max1600_gpio_name[2][MAX1600_GPIO_MAX] = {

    { "a0vcc", "a1vcc", "a0vpp", "a1vpp" },

    { "b0vcc", "b1vcc", "b0vpp", "b1vpp" },

};

​

int max1600_init(struct device *dev, struct max1600 **ptr,

    unsigned int channel, unsigned int code)

{

    struct max1600 *m;

    int chan;

    int i;

​

    switch (channel) {

    case MAX1600_CHAN_A:

        chan = 0;

        break;

    case MAX1600_CHAN_B:

        chan = 1;

        break;

    default:

        return -EINVAL;

    }

​

    if (code != MAX1600_CODE_LOW && code != MAX1600_CODE_HIGH)

        return -EINVAL;

​

    m = devm_kzalloc(dev, sizeof(*m), GFP_KERNEL);

    if (!m)

        return -ENOMEM;

​

    m->dev = dev;

    m->code = code;

​

    for (i = 0; i < MAX1600_GPIO_MAX; i++) {

        const char *name;

​

        name = max1600_gpio_name[chan][i];

        if (i != MAX1600_GPIO_0VPP) {

            m->gpio[i] = devm_gpiod_get(dev, name, GPIOD_OUT_LOW);

        } else {

            m->gpio[i] = devm_gpiod_get_optional(dev, name,

                                 GPIOD_OUT_LOW);

            if (!m->gpio[i])

                break;

        }

        if (IS_ERR(m->gpio[i]))

            return PTR_ERR(m->gpio[i]);

    }

​

    *ptr = m;

​