LXR linux/drivers/clk/clk-devres.c

   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
  37struct clk_bulk_devres {
  38        struct clk_bulk_data *clks;
  39        int num_clks;
  40};
  41
  42static void devm_clk_bulk_release(struct device *dev, void *res)
  43{
  44        struct clk_bulk_devres *devres = res;
  45
  46        clk_bulk_put(devres->num_clks, devres->clks);
  47}
  48
  49int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
  50                      struct clk_bulk_data *clks)
  51{
  52        struct clk_bulk_devres *devres;
  53        int ret;
  54
  55        devres = devres_alloc(devm_clk_bulk_release,
  56                              sizeof(*devres), GFP_KERNEL);
  57        if (!devres)
  58                return -ENOMEM;
  59
  60        ret = clk_bulk_get(dev, num_clks, clks);
  61        if (!ret) {
  62                devres->clks = clks;
  63                devres->num_clks = num_clks;
  64                devres_add(dev, devres);
  65        } else {
  66                devres_free(devres);
  67        }
  68
  69        return ret;
  70}
  71EXPORT_SYMBOL_GPL(devm_clk_bulk_get);
  72
  73static int devm_clk_match(struct device *dev, void *res, void *data)
  74{
  75        struct clk **c = res;
  76        if (!c || !*c) {
  77                WARN_ON(!c || !*c);
  78                return 0;
  79        }
  80        return *c == data;
  81}
  82
  83void devm_clk_put(struct device *dev, struct clk *clk)
  84{
  85        int ret;
  86
  87        ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
  88
  89        WARN_ON(ret);
  90}
  91EXPORT_SYMBOL(devm_clk_put);
  92
  93struct clk *devm_get_clk_from_child(struct device *dev,
  94                                    struct device_node *np, const char *con_id)
  95{
  96        struct clk **ptr, *clk;
  97
  98        ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
  99        if (!ptr)
 100                return ERR_PTR(-ENOMEM);
 101
 102        clk = of_clk_get_by_name(np, con_id);
 103        if (!IS_ERR(clk)) {
 104                *ptr = clk;
 105                devres_add(dev, ptr);
 106        } else {
 107                devres_free(ptr);
 108        }
 109
 110        return clk;
 111}
 112EXPORT_SYMBOL(devm_get_clk_from_child);
 113