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 struct 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 }
  89 EXPORT_SYMBOL_GPL(__regmap_init_ac97);
  90
  91 struct 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 }
  99 EXPORT_SYMBOL_GPL(__devm_regmap_init_ac97);
 100
 101 MODULE_LICENSE("GPL v2");