linux-imx

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

/*

 * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.

 *

 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.

 * Copyright (C) 2009 Sascha Hauer, Pengutronix

 */

​

#include <linux/mfd/mc13xxx.h>

#include <linux/platform_device.h>

#include <linux/hwmon-sysfs.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/hwmon.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/err.h>

​

#define DRIVER_NAME "mc13783-adc"

​

/* platform device id driver data */

#define MC13783_ADC_16CHANS 1

#define MC13783_ADC_BPDIV2  2

​

struct mc13783_adc_priv {

    struct mc13xxx *mc13xxx;

    struct device *hwmon_dev;

    char name[PLATFORM_NAME_SIZE];

};

​

static ssize_t name_show(struct device *dev, struct device_attribute *devattr,

             char *buf)

{

    struct mc13783_adc_priv *priv = dev_get_drvdata(dev);

​

    return sprintf(buf, "%s\n", priv->name);

}

​

static int mc13783_adc_read(struct device *dev,

        struct device_attribute *devattr, unsigned int *val)

{

    struct mc13783_adc_priv *priv = dev_get_drvdata(dev);

    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

    unsigned int channel = attr->index;

    unsigned int sample[4];

    int ret;

​

    ret = mc13xxx_adc_do_conversion(priv->mc13xxx,

            MC13XXX_ADC_MODE_MULT_CHAN,

            channel, 0, 0, sample);

    if (ret)

        return ret;

​

    /* ADIN7 subchannels */

    if (channel >= 16)

        channel = 7;

​

    channel &= 0x7;

​

    *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;

​

    return 0;