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
  29 bool 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 }
  54 EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
  55
  56 static 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
  66 static 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
  76 static const struct regmap_bus ac97_regmap_bus = {
  77         .reg_write = regmap_ac97_reg_write,
  78         .reg_read = regmap_ac97_reg_read,
  79 };
  80
  81 /**
  82  * regmap_init_ac97(): Initialise AC'97 register map
  83  *
  84  * @ac97: Device that will be interacted with
  85  * @config: Configuration for register map
  86  *
  87  * The return value will be an ERR_PTR() on error or a valid pointer to
  88  * a struct regmap.
  89  */
  90 struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,
  91                                 const struct regmap_config *config)
  92 {
  93         return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
  94 }
  95 EXPORT_SYMBOL_GPL(regmap_init_ac97);
  96
  97 /**
  98  * devm_regmap_init_ac97(): Initialise AC'97 register map
  99  *
 100  * @ac97: Device that will be interacted with
 101  * @config: Configuration for register map
 102  *
 103  * The return value will be an ERR_PTR() on error or a valid pointer
 104  * to a struct regmap.  The regmap will be automatically freed by the
 105  * device management code.
 106  */
 107 struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,
 108                                      const struct regmap_config *config)
 109 {
 110         return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
 111 }
 112 EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);
 113
 114 MODULE_LICENSE("GPL v2");