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
  17 bool 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 }
  42 EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
  43
  44 static 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
  54 static 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
  64 static const struct regmap_bus ac97_regmap_bus = {
  65         .reg_write = regmap_ac97_reg_write,
  66         .reg_read = regmap_ac97_reg_read,
  67 };
  68
  69 struct 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 }
  77 EXPORT_SYMBOL_GPL(__regmap_init_ac97);
  78
  79 struct 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 }
  87 EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
  88
  89 MODULE_LICENSE("GPL v2");