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

   1/*
   2 * Register map access API - AC'97 support
   3 *
   4 * Copyright 2013 Linaro Ltd.  All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include <linux/clk.h>
  20#include <linux/err.h>
  21#include <linux/init.h>
  22#include <linux/io.h>
  23#include <linux/module.h>
  24#include <linux/regmap.h>
  25#include <linux/slab.h>
  26
  27#include <sound/ac97_codec.h>
  28
  29bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
  30{
  31        switch (reg) {
  32        case AC97_RESET:
  33        case AC97_POWERDOWN:
  34        case AC97_INT_PAGING:
  35        case AC97_EXTENDED_ID:
  36        case AC97_EXTENDED_STATUS:
  37        case AC97_EXTENDED_MID:
  38        case AC97_EXTENDED_MSTATUS:
  39        case AC97_GPIO_STATUS:
  40        case AC97_MISC_AFE:
  41        case AC97_VENDOR_ID1:
  42        case AC97_VENDOR_ID2:
  43        case AC97_CODEC_CLASS_REV:
  44        case AC97_PCI_SVID:
  45        case AC97_PCI_SID:
  46        case AC97_FUNC_SELECT:
  47        case AC97_FUNC_INFO:
  48        case AC97_SENSE_INFO:
  49                return true;
  50        default:
  51                return false;
  52        }
  53}
  54EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
  55
  56static int regmap_ac97_reg_read(void *context, unsigned int reg,
  57        unsigned int *val)
  58{
  59        struct snd_ac97 *ac97 = context;
  60
  61        *val = ac97->bus->ops->read(ac97, reg);
  62
  63        return 0;
  64}
  65
  66static int regmap_ac97_reg_write(void *context, unsigned int reg,
  67        unsigned int val)
  68{
  69        struct snd_ac97 *ac97 = context;
  70
  71        ac97->bus->ops->write(ac97, reg, val);
  72
  73        return 0;
  74}
  75
  76static const struct regmap_bus ac97_regmap_bus = {
  77        .reg_write = regmap_ac97_reg_write,
  78        .reg_read = regmap_ac97_reg_read,
  79};
  80
  81struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
  82                                  const struct regmap_config *config,
  83                                  struct lock_class_key *lock_key,
  84                                  const char *lock_name)
  85{
  86        return __regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
  87                             lock_key, lock_name);
  88}
  89EXPORT_SYMBOL_GPL(__regmap_init_ac97);
  90
  91struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
  92                                       const struct regmap_config *config,
  93                                       struct lock_class_key *lock_key,
  94                                       const char *lock_name)
  95{
  96        return __devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config,
  97                                  lock_key, lock_name);
  98}
  99EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
 100
 101MODULE_LICENSE("GPL v2");
 102