sound/soc/soc-devres.c

   1 /*
   2  * soc-devres.c  --  ALSA SoC Audio Layer devres functions
   3  *
   4  * Copyright (C) 2013 Linaro Ltd
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <sound/soc.h>
  15 #include <sound/dmaengine_pcm.h>
  16
  17 static void devm_component_release(struct device *dev, void *res)
  18 {
  19         snd_soc_unregister_component(*(struct device **)res);
  20 }
  21
  22 /**
  23  * devm_snd_soc_register_component - resource managed component registration
  24  * @dev: Device used to manage component
  25  * @cmpnt_drv: Component driver
  26  * @dai_drv: DAI driver
  27  * @num_dai: Number of DAIs to register
  28  *
  29  * Register a component with automatic unregistration when the device is
  30  * unregistered.
  31  */
  32 int devm_snd_soc_register_component(struct device *dev,
  33                          const struct snd_soc_component_driver *cmpnt_drv,
  34                          struct snd_soc_dai_driver *dai_drv, int num_dai)
  35 {
  36         struct device **ptr;
  37         int ret;
  38
  39         ptr = devres_alloc(devm_component_release, sizeof(*ptr), GFP_KERNEL);
  40         if (!ptr)
  41                 return -ENOMEM;
  42
  43         ret = snd_soc_register_component(dev, cmpnt_drv, dai_drv, num_dai);
  44         if (ret == 0) {
  45                 *ptr = dev;
  46                 devres_add(dev, ptr);
  47         } else {
  48                 devres_free(ptr);
  49         }
  50
  51         return ret;
  52 }
  53 EXPORT_SYMBOL_GPL(devm_snd_soc_register_component);
  54
  55 static void devm_card_release(struct device *dev, void *res)
  56 {
  57         snd_soc_unregister_card(*(struct snd_soc_card **)res);
  58 }
  59
  60 /**
  61  * devm_snd_soc_register_card - resource managed card registration
  62  * @dev: Device used to manage card
  63  * @card: Card to register
  64  *
  65  * Register a card with automatic unregistration when the device is
  66  * unregistered.
  67  */
  68 int devm_snd_soc_register_card(struct device *dev, struct snd_soc_card *card)
  69 {
  70         struct snd_soc_card **ptr;
  71         int ret;
  72
  73         ptr = devres_alloc(devm_card_release, sizeof(*ptr), GFP_KERNEL);
  74         if (!ptr)
  75                 return -ENOMEM;
  76
  77         ret = snd_soc_register_card(card);
  78         if (ret == 0) {
  79                 *ptr = card;
  80                 devres_add(dev, ptr);
  81         } else {
  82                 devres_free(ptr);
  83         }
  84
  85         return ret;
  86 }
  87 EXPORT_SYMBOL_GPL(devm_snd_soc_register_card);
  88
  89 #ifdef CONFIG_SND_SOC_GENERIC_DMAENGINE_PCM
  90
  91 static void devm_dmaengine_pcm_release(struct device *dev, void *res)
  92 {
  93         snd_dmaengine_pcm_unregister(*(struct device **)res);
  94 }
  95
  96 /**
  97  * devm_snd_dmaengine_pcm_register - resource managed dmaengine PCM registration
  98  * @dev: The parent device for the PCM device
  99  * @config: Platform specific PCM configuration
 100  * @flags: Platform specific quirks
 101  *
 102  * Register a dmaengine based PCM device with automatic unregistration when the
 103  * device is unregistered.
 104  */
 105 int devm_snd_dmaengine_pcm_register(struct device *dev,
 106         const struct snd_dmaengine_pcm_config *config, unsigned int flags)
 107 {
 108         struct device **ptr;
 109         int ret;
 110
 111         ptr = devres_alloc(devm_dmaengine_pcm_release, sizeof(*ptr), GFP_KERNEL);
 112         if (!ptr)
 113                 return -ENOMEM;
 114
 115         ret = snd_dmaengine_pcm_register(dev, config, flags);
 116         if (ret == 0) {
 117                 *ptr = dev;
 118                 devres_add(dev, ptr);
 119         } else {
 120                 devres_free(ptr);
 121         }
 122
 123         return ret;
 124 }
 125 EXPORT_SYMBOL_GPL(devm_snd_dmaengine_pcm_register);
 126
 127 #endif