Re: [alsa-devel] [PATCH 1/4] regmap: ac97: Add generic AC'97 callbacks

[Lars-Peter Clausen <lars@metafoo.de>]

On 11/18/2014 07:45 PM, Lars-Peter Clausen wrote:
> From: Mark Brown <broonie@linaro.org>
>
> Use the recently added support for bus operations to provide a standard
> mapping for AC'97 register I/O.
>
> Signed-off-by: Mark Brown <broonie@linaro.org>

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

Sorry for that.

> ---
> Changes from the original version:
> 	* Add ac97_regmap_bus and made regmap_ac97_reg_{write,read} static
> 	* Use ac97->bus->ops instead of passing the ops separately
> ---
>   drivers/base/regmap/Kconfig       |   5 +-
>   drivers/base/regmap/Makefile      |   1 +
>   drivers/base/regmap/regmap-ac97.c | 114 ++++++++++++++++++++++++++++++++++++++
>   include/linux/regmap.h            |   7 +++
>   4 files changed, 126 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/base/regmap/regmap-ac97.c
>
> diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
> index 8a3f51f..db9d00c3 100644
> --- a/drivers/base/regmap/Kconfig
> +++ b/drivers/base/regmap/Kconfig
> @@ -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
> diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
> index a7c670b..0a53365 100644
> --- a/drivers/base/regmap/Makefile
> +++ b/drivers/base/regmap/Makefile
> @@ -1,6 +1,7 @@
>   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
> diff --git a/drivers/base/regmap/regmap-ac97.c b/drivers/base/regmap/regmap-ac97.c
> new file mode 100644
> index 0000000..e4c45d2
> --- /dev/null
> +++ b/drivers/base/regmap/regmap-ac97.c
> @@ -0,0 +1,114 @@
> +/*
> + * 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");
> diff --git a/include/linux/regmap.h b/include/linux/regmap.h
> index c5ed83f..4419b99 100644
> --- a/include/linux/regmap.h
> +++ b/include/linux/regmap.h
> @@ -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
>