linux-imx

/*

 * RTC subsystem, nvmem interface

 *

 * Copyright (C) 2017 Alexandre Belloni

 *

 * 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/err.h>

#include <linux/types.h>

#include <linux/nvmem-consumer.h>

#include <linux/rtc.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

​

/*

 * Deprecated ABI compatibility, this should be removed at some point

 */

​

static const char nvram_warning[] = "Deprecated ABI, please use nvmem";

​

static ssize_t

rtc_nvram_read(struct file *filp, struct kobject *kobj,

           struct bin_attribute *attr,

           char *buf, loff_t off, size_t count)

{

    dev_warn_once(kobj_to_dev(kobj), nvram_warning);

​

    return nvmem_device_read(attr->private, off, count, buf);

}

​

static ssize_t

rtc_nvram_write(struct file *filp, struct kobject *kobj,

        struct bin_attribute *attr,

        char *buf, loff_t off, size_t count)

{

    dev_warn_once(kobj_to_dev(kobj), nvram_warning);

​

    return nvmem_device_write(attr->private, off, count, buf);

}

​

static int rtc_nvram_register(struct rtc_device *rtc,

                  struct nvmem_device *nvmem, size_t size)

{

    int err;

​

    rtc->nvram = kzalloc(sizeof(struct bin_attribute), GFP_KERNEL);

    if (!rtc->nvram)

        return -ENOMEM;

​

    rtc->nvram->attr.name = "nvram";

    rtc->nvram->attr.mode = 0644;

    rtc->nvram->private = nvmem;

​

    sysfs_bin_attr_init(rtc->nvram);

​

    rtc->nvram->read = rtc_nvram_read;

    rtc->nvram->write = rtc_nvram_write;

    rtc->nvram->size = size;

​

    err = sysfs_create_bin_file(&rtc->dev.parent->kobj,