LXR linux/drivers/base/regmap/regmap-ac97.c

   1// SPDX-License-Identifier: GPL-2.0
   2//
   3// Register map access API - AC'97 support
   4//
   5// Copyright 2013 Linaro Ltd.  All rights reserved.
   6
   7#include <linux/clk.h>
   8#include <linux/err.h>
   9#include <linux/init.h>
  10#include <linux/io.h>
  11#include <linux/module.h>
  12#include <linux/regmap.h>
  13#include <linux/slab.h>
  14
  15#include <sound/ac97_codec.h>
  16
  17bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
  18{
  19        switch (reg) {
  20        case AC97_RESET:
  21        case AC97_POWERDOWN:
  22        case AC97_INT_PAGING:
  23        case AC97_EXTENDED_ID:
  24        case AC97_EXTENDED_STATUS:
  25        case AC97_EXTENDED_MID:
  26        case AC97_EXTENDED_MSTATUS:
  27        case AC97_GPIO_STATUS:
  28        case AC97_MISC_AFE:
  29        case AC97_VENDOR_ID1:
  30        case AC97_VENDOR_ID2:
  31        case AC97_CODEC_CLASS_REV:
  32        case AC97_PCI_SVID:
  33        case AC97_PCI_SID:
  34        case AC97_FUNC_SELECT:
  35        case AC97_FUNC_INFO:
  36        case AC97_SENSE_INFO:
  37                return true;
  38        default:
  39                return false;
  40        }
  41}
  42EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
  43
  44static int regmap_ac97_reg_read(void *context, unsigned int reg,
  45        unsigned int *val)
  46{
  47        struct snd_ac97 *ac97 = context;
  48
  49        *val = ac97->bus->ops->read(ac97, reg);
  50
  51        return 0;
  52}
  53
  54static int regmap_ac97_reg_write(void *context, unsigned int reg,
  55        unsigned int val)
  56{
  57        struct snd_ac97 *ac97 = context;
  58
  59        ac97->bus->ops->write(ac97, reg, val);
  60
  61        return 0;
  62}
  63
  64static const struct regmap_bus ac97_regmap_bus = {
  65        .reg_write = regmap_ac97_reg_write,
  66        .reg_read = regmap_ac97_reg_read,
  67};
  68
  69struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
  70                                  const struct regmap_config *config,
  71                                  struct lock_class_key *lock_key,
  72                                  const char *lock_name)
  73{
  74        return __regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
  75                             lock_key, lock_name);
  76}
  77EXPORT_SYMBOL_GPL(__regmap_init_ac97);
  78
  79struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
  80                                       const struct regmap_config *config,
  81                                       struct lock_class_key *lock_key,
  82                                       const char *lock_name)
  83{
  84        return __devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
  85                                  lock_key, lock_name);
  86}
  87EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
  88
  89MODULE_LICENSE("GPL v2");
  90