clk-devres.c

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/*
 * 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/clk.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/gfp.h>

static void devm_clk_release(struct device *dev, void *res)
{
    clk_put(*(struct clk **)res);
}

struct clk *devm_clk_get(struct device *dev, const char *id)
{
    struct clk **ptr, *clk;

    ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
    if (!ptr)
        return ERR_PTR(-ENOMEM);

    clk = clk_get(dev, id);
    if (!IS_ERR(clk)) {
        *ptr = clk;
        devres_add(dev, ptr);
    } else {
        devres_free(ptr);
    }

    return clk;
}
EXPORT_SYMBOL(devm_clk_get);

static int devm_clk_match(struct device *dev, void *res, void *data)
{
    struct clk **c = res;
    if (!c || !*c) {
        WARN_ON(!c || !*c);
        return 0;
    }
    return *c == data;
}

void devm_clk_put(struct device *dev, struct clk *clk)
{
    int ret;

    ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);

    WARN_ON(ret);
}
EXPORT_SYMBOL(devm_clk_put);