linux/drivers/clk/clk-devres.c
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   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License version 2 as
   4 * published by the Free Software Foundation.
   5 */
   6
   7#include <linux/clk.h>
   8#include <linux/device.h>
   9#include <linux/export.h>
  10#include <linux/gfp.h>
  11
  12static void devm_clk_release(struct device *dev, void *res)
  13{
  14        clk_put(*(struct clk **)res);
  15}
  16
  17struct clk *devm_clk_get(struct device *dev, const char *id)
  18{
  19        struct clk **ptr, *clk;
  20
  21        ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
  22        if (!ptr)
  23                return ERR_PTR(-ENOMEM);
  24
  25        clk = clk_get(dev, id);
  26        if (!IS_ERR(clk)) {
  27                *ptr = clk;
  28                devres_add(dev, ptr);
  29        } else {
  30                devres_free(ptr);
  31        }
  32
  33        return clk;
  34}
  35EXPORT_SYMBOL(devm_clk_get);
  36
  37static int devm_clk_match(struct device *dev, void *res, void *data)
  38{
  39        struct clk **c = res;
  40        if (!c || !*c) {
  41                WARN_ON(!c || !*c);
  42                return 0;
  43        }
  44        return *c == data;
  45}
  46
  47void devm_clk_put(struct device *dev, struct clk *clk)
  48{
  49        int ret;
  50
  51        ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
  52
  53        WARN_ON(ret);
  54}
  55EXPORT_SYMBOL(devm_clk_put);
  56
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