Commit 22853223 authored by Mark Brown's avatar Mark Brown
Browse files

regmap: ac97: Add generic AC'97 callbacks 



Use the recently added support for bus operations to provide a standard
mapping for AC'97 register I/O.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
parent f114040e

drivers/base/regmap/Kconfig

+4 −1
Original line number Diff line number Diff line
@@ -3,12 +3,15 @@ 
# subsystems should select the appropriate symbols.



config REGMAP

	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_MMIO || REGMAP_IRQ)

	default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ)

	select LZO_COMPRESS

	select LZO_DECOMPRESS

	select IRQ_DOMAIN if REGMAP_IRQ

	bool



config REGMAP_AC97

	tristate



config REGMAP_I2C

	tristate

	depends on I2C

drivers/base/regmap/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_REGMAP) += regmap.o regcache.o

obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o regcache-flat.o

obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o

obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o

obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o

obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o

obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o

drivers/base/regmap/regmap-ac97.c

0 → 100644
+114 −0
Original line number Diff line number Diff line 
/*

 * Register map access API - AC'97 support

 *

 * Copyright 2013 Linaro Ltd.  All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/clk.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/slab.h>



#include <sound/ac97_codec.h>



bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case AC97_RESET:

	case AC97_POWERDOWN:

	case AC97_INT_PAGING:

	case AC97_EXTENDED_ID:

	case AC97_EXTENDED_STATUS:

	case AC97_EXTENDED_MID:

	case AC97_EXTENDED_MSTATUS:

	case AC97_GPIO_STATUS:

	case AC97_MISC_AFE:

	case AC97_VENDOR_ID1:

	case AC97_VENDOR_ID2:

	case AC97_CODEC_CLASS_REV:

	case AC97_PCI_SVID:

	case AC97_PCI_SID:

	case AC97_FUNC_SELECT:

	case AC97_FUNC_INFO:

	case AC97_SENSE_INFO:

		return true;

	default:

		return false;

	}

}

EXPORT_SYMBOL_GPL(regmap_ac97_default_volatile);



static int regmap_ac97_reg_read(void *context, unsigned int reg,

	unsigned int *val)

{

	struct snd_ac97 *ac97 = context;



	*val = ac97->bus->ops->read(ac97, reg);



	return 0;

}



static int regmap_ac97_reg_write(void *context, unsigned int reg,

	unsigned int val)

{

	struct snd_ac97 *ac97 = context;



	ac97->bus->ops->write(ac97, reg, val);



	return 0;

}



static const struct regmap_bus ac97_regmap_bus = {

		.reg_write = regmap_ac97_reg_write,

		.reg_read = regmap_ac97_reg_read,

};



/**

 * regmap_init_ac97(): Initialise AC'97 register map

 *

 * @ac97: Device that will be interacted with

 * @config: Configuration for register map

 *

 * The return value will be an ERR_PTR() on error or a valid pointer to

 * a struct regmap.

 */

struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,

				const struct regmap_config *config)

{

	return regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);

}

EXPORT_SYMBOL_GPL(regmap_init_ac97);



/**

 * devm_regmap_init_ac97(): Initialise AC'97 register map

 *

 * @ac97: Device that will be interacted with

 * @config: Configuration for register map

 *

 * The return value will be an ERR_PTR() on error or a valid pointer

 * to a struct regmap.  The regmap will be automatically freed by the

 * device management code.

 */

struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,

				     const struct regmap_config *config)

{

	return devm_regmap_init(&ac97->dev, &ac97_regmap_bus, ac97, config);

}

EXPORT_SYMBOL_GPL(devm_regmap_init_ac97);



MODULE_LICENSE("GPL v2");

include/linux/regmap.h

+7 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ struct spmi_device; 
struct regmap;

struct regmap_range_cfg;

struct regmap_field;

struct snd_ac97;



/* An enum of all the supported cache types */

enum regcache_type {
@@ -340,6 +341,8 @@ struct regmap *regmap_init_spmi_ext(struct spmi_device *dev, 
struct regmap *regmap_init_mmio_clk(struct device *dev, const char *clk_id,

				    void __iomem *regs,

				    const struct regmap_config *config);

struct regmap *regmap_init_ac97(struct snd_ac97 *ac97,

				const struct regmap_config *config);



struct regmap *devm_regmap_init(struct device *dev,

				const struct regmap_bus *bus,
@@ -356,6 +359,10 @@ struct regmap *devm_regmap_init_spmi_ext(struct spmi_device *dev, 
struct regmap *devm_regmap_init_mmio_clk(struct device *dev, const char *clk_id,

					 void __iomem *regs,

					 const struct regmap_config *config);

struct regmap *devm_regmap_init_ac97(struct snd_ac97 *ac97,

				     const struct regmap_config *config);



bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);



/**

 * regmap_init_mmio(): Initialise register map