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115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/*
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* Register map access API - AC'97 support
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*
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* Copyright 2013 Linaro Ltd. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <sound/ac97_codec.h>
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bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case AC97_RESET:
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case AC97_POWERDOWN:
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case AC97_INT_PAGING:
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case AC97_EXTENDED_ID:
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case AC97_EXTENDED_STATUS:
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case AC97_EXTENDED_MID:
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case AC97_EXTENDED_MSTATUS:
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case AC97_GPIO_STATUS:
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case AC97_MISC_AFE:
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case AC97_VENDOR_ID1:
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case AC97_VENDOR_ID2:
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case AC97_CODEC_CLASS_REV:
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case AC97_PCI_SVID:
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case AC97_PCI_SID:
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case AC97_FUNC_SELECT:
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case AC97_FUNC_INFO:
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case AC97_SENSE_INFO:
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return true;
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default:
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return false;
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}
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}
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EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);
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static int regmap_ac97_reg_read(void *context, unsigned int reg,
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unsigned int *val)
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{
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struct snd_ac97 *ac97 = context;
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*val = ac97->bus->ops->read(ac97, reg);
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return 0;
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}
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static int regmap_ac97_reg_write(void *context, unsigned int reg,
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unsigned int val)
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{
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struct snd_ac97 *ac97 = context;
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ac97->bus->ops->write(ac97, reg, val);
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return 0;
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}
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static const struct regmap_bus ac97_regmap_bus = {
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.reg_write = regmap_ac97_reg_write,
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.reg_read = regmap_ac97_reg_read,
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};
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/**
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* regmap_init_ac97(): Initialise AC'97 register map
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*
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* @ac97: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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* a struct regmap.
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*/
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struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,
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const struct regmap_config *config)
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{
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return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
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}
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EXPORT_SYMBOL_GPL(regmap_init_ac97);
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/**
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* devm_regmap_init_ac97(): Initialise AC'97 register map
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*
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* @ac97: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer
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* to a struct regmap. The regmap will be automatically freed by the
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* device management code.
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*/
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struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,
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const struct regmap_config *config)
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{
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return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);
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MODULE_LICENSE("GPL v2");
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