[mirror_ubuntu-bionic-kernel.git] / include / linux / regmap.h

#ifndef __LINUX_REGMAP_H
#define __LINUX_REGMAP_H

/*
 * Register map access API
 *
 * Copyright 2011 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/err.h>
#include <linux/bug.h>
#include <linux/lockdep.h>

struct module;
struct device;
struct i2c_client;
struct irq_domain;
struct spi_device;
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 {
	REGCACHE_NONE,
	REGCACHE_RBTREE,
	REGCACHE_COMPRESSED,
	REGCACHE_FLAT,
};

/**
 * Default value for a register.  We use an array of structs rather
 * than a simple array as many modern devices have very sparse
 * register maps.
 *
 * @reg: Register address.
 * @def: Register default value.
 */
struct reg_default {
	unsigned int reg;
	unsigned int def;
};

/**
 * Register/value pairs for sequences of writes with an optional delay in
 * microseconds to be applied after each write.
 *
 * @reg: Register address.
 * @def: Register value.
 * @delay_us: Delay to be applied after the register write in microseconds
 */
struct reg_sequence {
	unsigned int reg;
	unsigned int def;
	unsigned int delay_us;
};

#define	regmap_update_bits(map, reg, mask, val) \
	regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
#define	regmap_update_bits_async(map, reg, mask, val)\
	regmap_update_bits_base(map, reg, mask, val, NULL, true, false)
#define	regmap_update_bits_check(map, reg, mask, val, change)\
	regmap_update_bits_base(map, reg, mask, val, change, false, false)
#define	regmap_update_bits_check_async(map, reg, mask, val, change)\
	regmap_update_bits_base(map, reg, mask, val, change, true, false)

#define	regmap_field_write(field, val) \
	regmap_field_update_bits_base(field, ~0, val, NULL, false, false)
#define	regmap_field_update_bits(field, mask, val)\
	regmap_field_update_bits_base(field, mask, val, NULL, false, false)

#define	regmap_fields_write(field, id, val) \
	regmap_fields_update_bits_base(field, id, ~0, val, NULL, false, false)
#define	regmap_fields_update_bits(field, id, mask, val)\
	regmap_fields_update_bits_base(field, id, mask, val, NULL, false, false)

#ifdef CONFIG_REGMAP

enum regmap_endian {
	/* Unspecified -> 0 -> Backwards compatible default */
	REGMAP_ENDIAN_DEFAULT = 0,
	REGMAP_ENDIAN_BIG,
	REGMAP_ENDIAN_LITTLE,
	REGMAP_ENDIAN_NATIVE,
};

/**
 * A register range, used for access related checks
 * (readable/writeable/volatile/precious checks)
 *
 * @range_min: address of first register
 * @range_max: address of last register
 */
struct regmap_range {
	unsigned int range_min;
	unsigned int range_max;
};

#define regmap_reg_range(low, high) { .range_min = low, .range_max = high, }

/*
 * A table of ranges including some yes ranges and some no ranges.
 * If a register belongs to a no_range, the corresponding check function
 * will return false. If a register belongs to a yes range, the corresponding
 * check function will return true. "no_ranges" are searched first.
 *
 * @yes_ranges : pointer to an array of regmap ranges used as "yes ranges"
 * @n_yes_ranges: size of the above array
 * @no_ranges: pointer to an array of regmap ranges used as "no ranges"
 * @n_no_ranges: size of the above array
 */
struct regmap_access_table {
	const struct regmap_range *yes_ranges;
	unsigned int n_yes_ranges;
	const struct regmap_range *no_ranges;
	unsigned int n_no_ranges;
};

typedef void (*regmap_lock)(void *);
typedef void (*regmap_unlock)(void *);

/**
 * Configuration for the register map of a device.
 *
 * @name: Optional name of the regmap. Useful when a device has multiple
 *        register regions.
 *
 * @reg_bits: Number of bits in a register address, mandatory.
 * @reg_stride: The register address stride. Valid register addresses are a
 *              multiple of this value. If set to 0, a value of 1 will be
 *              used.
 * @pad_bits: Number of bits of padding between register and value.
 * @val_bits: Number of bits in a register value, mandatory.
 *
 * @writeable_reg: Optional callback returning true if the register
 *		   can be written to. If this field is NULL but wr_table
 *		   (see below) is not, the check is performed on such table
 *                 (a register is writeable if it belongs to one of the ranges
 *                  specified by wr_table).
 * @readable_reg: Optional callback returning true if the register
 *		  can be read from. If this field is NULL but rd_table
 *		   (see below) is not, the check is performed on such table
 *                 (a register is readable if it belongs to one of the ranges
 *                  specified by rd_table).
 * @volatile_reg: Optional callback returning true if the register
 *		  value can't be cached. If this field is NULL but
 *		  volatile_table (see below) is not, the check is performed on
 *                such table (a register is volatile if it belongs to one of
 *                the ranges specified by volatile_table).
 * @precious_reg: Optional callback returning true if the register
 *		  should not be read outside of a call from the driver
 *		  (e.g., a clear on read interrupt status register). If this
 *                field is NULL but precious_table (see below) is not, the
 *                check is performed on such table (a register is precious if
 *                it belongs to one of the ranges specified by precious_table).
 * @lock:	  Optional lock callback (overrides regmap's default lock
 *		  function, based on spinlock or mutex).
 * @unlock:	  As above for unlocking.
 * @lock_arg:	  this field is passed as the only argument of lock/unlock
 *		  functions (ignored in case regular lock/unlock functions
 *		  are not overridden).
 * @reg_read:	  Optional callback that if filled will be used to perform
 *           	  all the reads from the registers. Should only be provided for
 *		  devices whose read operation cannot be represented as a simple
 *		  read operation on a bus such as SPI, I2C, etc. Most of the
 *		  devices do not need this.
 * @reg_write:	  Same as above for writing.
 * @fast_io:	  Register IO is fast. Use a spinlock instead of a mutex
 *	     	  to perform locking. This field is ignored if custom lock/unlock
 *	     	  functions are used (see fields lock/unlock of struct regmap_config).
 *		  This field is a duplicate of a similar file in
 *		  'struct regmap_bus' and serves exact same purpose.
 *		   Use it only for "no-bus" cases.
 * @max_register: Optional, specifies the maximum valid register index.
 * @wr_table:     Optional, points to a struct regmap_access_table specifying
 *                valid ranges for write access.
 * @rd_table:     As above, for read access.
 * @volatile_table: As above, for volatile registers.
 * @precious_table: As above, for precious registers.
 * @reg_defaults: Power on reset values for registers (for use with
 *                register cache support).
 * @num_reg_defaults: Number of elements in reg_defaults.
 *
 * @read_flag_mask: Mask to be set in the top byte of the register when doing
 *                  a read.
 * @write_flag_mask: Mask to be set in the top byte of the register when doing
 *                   a write. If both read_flag_mask and write_flag_mask are
 *                   empty the regmap_bus default masks are used.
 * @use_single_rw: If set, converts the bulk read and write operations into
 *		    a series of single read and write operations. This is useful
 *		    for device that does not support bulk read and write.
 * @can_multi_write: If set, the device supports the multi write mode of bulk
 *                   write operations, if clear multi write requests will be
 *                   split into individual write operations
 *
 * @cache_type: The actual cache type.
 * @reg_defaults_raw: Power on reset values for registers (for use with
 *                    register cache support).
 * @num_reg_defaults_raw: Number of elements in reg_defaults_raw.
 * @reg_format_endian: Endianness for formatted register addresses. If this is
 *                     DEFAULT, the @reg_format_endian_default value from the
 *                     regmap bus is used.
 * @val_format_endian: Endianness for formatted register values. If this is
 *                     DEFAULT, the @reg_format_endian_default value from the
 *                     regmap bus is used.
 *
 * @ranges: Array of configuration entries for virtual address ranges.
 * @num_ranges: Number of range configuration entries.
 */
struct regmap_config {
	const char *name;

	int reg_bits;
	int reg_stride;
	int pad_bits;
	int val_bits;

	bool (*writeable_reg)(struct device *dev, unsigned int reg);
	bool (*readable_reg)(struct device *dev, unsigned int reg);
	bool (*volatile_reg)(struct device *dev, unsigned int reg);
	bool (*precious_reg)(struct device *dev, unsigned int reg);
	regmap_lock lock;
	regmap_unlock unlock;
	void *lock_arg;

	int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
	int (*reg_write)(void *context, unsigned int reg, unsigned int val);

	bool fast_io;

	unsigned int max_register;
	const struct regmap_access_table *wr_table;
	const struct regmap_access_table *rd_table;
	const struct regmap_access_table *volatile_table;
	const struct regmap_access_table *precious_table;
	const struct reg_default *reg_defaults;
	unsigned int num_reg_defaults;
	enum regcache_type cache_type;
	const void *reg_defaults_raw;
	unsigned int num_reg_defaults_raw;

	u8 read_flag_mask;
	u8 write_flag_mask;

	bool use_single_rw;
	bool can_multi_write;

	enum regmap_endian reg_format_endian;
	enum regmap_endian val_format_endian;

	const struct regmap_range_cfg *ranges;
	unsigned int num_ranges;
};

/**
 * Configuration for indirectly accessed or paged registers.
 * Registers, mapped to this virtual range, are accessed in two steps:
 *     1. page selector register update;
 *     2. access through data window registers.
 *
 * @name: Descriptive name for diagnostics
 *
 * @range_min: Address of the lowest register address in virtual range.
 * @range_max: Address of the highest register in virtual range.
 *
 * @page_sel_reg: Register with selector field.
 * @page_sel_mask: Bit shift for selector value.
 * @page_sel_shift: Bit mask for selector value.
 *
 * @window_start: Address of first (lowest) register in data window.
 * @window_len: Number of registers in data window.
 */
struct regmap_range_cfg {
	const char *name;

	/* Registers of virtual address range */
	unsigned int range_min;
	unsigned int range_max;

	/* Page selector for indirect addressing */
	unsigned int selector_reg;
	unsigned int selector_mask;
	int selector_shift;

	/* Data window (per each page) */
	unsigned int window_start;
	unsigned int window_len;
};

struct regmap_async;

typedef int (*regmap_hw_write)(void *context, const void *data,
			       size_t count);
typedef int (*regmap_hw_gather_write)(void *context,
				      const void *reg, size_t reg_len,
				      const void *val, size_t val_len);
typedef int (*regmap_hw_async_write)(void *context,
				     const void *reg, size_t reg_len,
				     const void *val, size_t val_len,
				     struct regmap_async *async);
typedef int (*regmap_hw_read)(void *context,
			      const void *reg_buf, size_t reg_size,
			      void *val_buf, size_t val_size);
typedef int (*regmap_hw_reg_read)(void *context, unsigned int reg,
				  unsigned int *val);
typedef int (*regmap_hw_reg_write)(void *context, unsigned int reg,
				   unsigned int val);
typedef int (*regmap_hw_reg_update_bits)(void *context, unsigned int reg,
					 unsigned int mask, unsigned int val);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);

/**
 * Description of a hardware bus for the register map infrastructure.
 *
 * @fast_io: Register IO is fast. Use a spinlock instead of a mutex
 *	     to perform locking. This field is ignored if custom lock/unlock
 *	     functions are used (see fields lock/unlock of
 *	     struct regmap_config).
 * @write: Write operation.
 * @gather_write: Write operation with split register/value, return -ENOTSUPP
 *                if not implemented  on a given device.
 * @async_write: Write operation which completes asynchronously, optional and
 *               must serialise with respect to non-async I/O.
 * @reg_write: Write a single register value to the given register address. This
 *             write operation has to complete when returning from the function.
 * @read: Read operation.  Data is returned in the buffer used to transmit
 *         data.
 * @reg_read: Read a single register value from a given register address.
 * @free_context: Free context.
 * @async_alloc: Allocate a regmap_async() structure.
 * @read_flag_mask: Mask to be set in the top byte of the register when doing
 *                  a read.
 * @reg_format_endian_default: Default endianness for formatted register
 *     addresses. Used when the regmap_config specifies DEFAULT. If this is
 *     DEFAULT, BIG is assumed.
 * @val_format_endian_default: Default endianness for formatted register
 *     values. Used when the regmap_config specifies DEFAULT. If this is
 *     DEFAULT, BIG is assumed.
 * @max_raw_read: Max raw read size that can be used on the bus.
 * @max_raw_write: Max raw write size that can be used on the bus.
 */
struct regmap_bus {
	bool fast_io;
	regmap_hw_write write;
	regmap_hw_gather_write gather_write;
	regmap_hw_async_write async_write;
	regmap_hw_reg_write reg_write;
	regmap_hw_reg_update_bits reg_update_bits;
	regmap_hw_read read;
	regmap_hw_reg_read reg_read;
	regmap_hw_free_context free_context;
	regmap_hw_async_alloc async_alloc;
	u8 read_flag_mask;
	enum regmap_endian reg_format_endian_default;
	enum regmap_endian val_format_endian_default;
	size_t max_raw_read;
	size_t max_raw_write;
};

/*
 * __regmap_init functions.
 *
 * These functions take a lock key and name parameter, and should not be called
 * directly. Instead, use the regmap_init macros that generate a key and name
 * for each call.
 */
struct regmap *__regmap_init(struct device *dev,
			     const struct regmap_bus *bus,
			     void *bus_context,
			     const struct regmap_config *config,
			     struct lock_class_key *lock_key,
			     const char *lock_name);
struct regmap *__regmap_init_i2c(struct i2c_client *i2c,
				 const struct regmap_config *config,
				 struct lock_class_key *lock_key,
				 const char *lock_name);
struct regmap *__regmap_init_spi(struct spi_device *dev,
				 const struct regmap_config *config,
				 struct lock_class_key *lock_key,
				 const char *lock_name);
struct regmap *__regmap_init_spmi_base(struct spmi_device *dev,
				       const struct regmap_config *config,
				       struct lock_class_key *lock_key,
				       const char *lock_name);
struct regmap *__regmap_init_spmi_ext(struct spmi_device *dev,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name);
struct regmap *__regmap_init_mmio_clk(struct device *dev, const char *clk_id,
				      void __iomem *regs,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name);
struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
				  const struct regmap_config *config,
				  struct lock_class_key *lock_key,
				  const char *lock_name);

struct regmap *__devm_regmap_init(struct device *dev,
				  const struct regmap_bus *bus,
				  void *bus_context,
				  const struct regmap_config *config,
				  struct lock_class_key *lock_key,
				  const char *lock_name);
struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name);
struct regmap *__devm_regmap_init_spi(struct spi_device *dev,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name);
struct regmap *__devm_regmap_init_spmi_base(struct spmi_device *dev,
					    const struct regmap_config *config,
					    struct lock_class_key *lock_key,
					    const char *lock_name);
struct regmap *__devm_regmap_init_spmi_ext(struct spmi_device *dev,
					   const struct regmap_config *config,
					   struct lock_class_key *lock_key,
					   const char *lock_name);
struct regmap *__devm_regmap_init_mmio_clk(struct device *dev,
					   const char *clk_id,
					   void __iomem *regs,
					   const struct regmap_config *config,
					   struct lock_class_key *lock_key,
					   const char *lock_name);
struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
				       const struct regmap_config *config,
				       struct lock_class_key *lock_key,
				       const char *lock_name);

/*
 * Wrapper for regmap_init macros to include a unique lockdep key and name
 * for each call. No-op if CONFIG_LOCKDEP is not set.
 *
 * @fn: Real function to call (in the form __[*_]regmap_init[_*])
 * @name: Config variable name (#config in the calling macro)
 **/
#ifdef CONFIG_LOCKDEP
#define __regmap_lockdep_wrapper(fn, name, ...)				\
(									\
	({								\
		static struct lock_class_key _key;			\
		fn(__VA_ARGS__, &_key,					\
			KBUILD_BASENAME ":"				\
			__stringify(__LINE__) ":"			\
			"(" name ")->lock");				\
	})								\
)
#else
#define __regmap_lockdep_wrapper(fn, name, ...) fn(__VA_ARGS__, NULL, NULL)
#endif

/**
 * regmap_init(): Initialise register map
 *
 * @dev: Device that will be interacted with
 * @bus: Bus-specific callbacks to use with device
 * @bus_context: Data passed to bus-specific callbacks
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer to
 * a struct regmap.  This function should generally not be called
 * directly, it should be called by bus-specific init functions.
 */
#define regmap_init(dev, bus, bus_context, config)			\
	__regmap_lockdep_wrapper(__regmap_init, #config,		\
				dev, bus, bus_context, config)
int regmap_attach_dev(struct device *dev, struct regmap *map,
		      const struct regmap_config *config);

/**
 * regmap_init_i2c(): Initialise register map
 *
 * @i2c: 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.
 */
#define regmap_init_i2c(i2c, config)					\
	__regmap_lockdep_wrapper(__regmap_init_i2c, #config,		\
				i2c, config)

/**
 * regmap_init_spi(): Initialise register map
 *
 * @spi: 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.
 */
#define regmap_init_spi(dev, config)					\
	__regmap_lockdep_wrapper(__regmap_init_spi, #config,		\
				dev, config)

/**
 * regmap_init_spmi_base(): Create regmap for the Base register space
 * @sdev:	SPMI 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.
 */
#define regmap_init_spmi_base(dev, config)				\
	__regmap_lockdep_wrapper(__regmap_init_spmi_base, #config,	\
				dev, config)

/**
 * regmap_init_spmi_ext(): Create regmap for Ext register space
 * @sdev:	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.
 */
#define regmap_init_spmi_ext(dev, config)				\
	__regmap_lockdep_wrapper(__regmap_init_spmi_ext, #config,	\
				dev, config)

/**
 * regmap_init_mmio_clk(): Initialise register map with register clock
 *
 * @dev: Device that will be interacted with
 * @clk_id: register clock consumer ID
 * @regs: Pointer to memory-mapped IO region
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer to
 * a struct regmap.
 */
#define regmap_init_mmio_clk(dev, clk_id, regs, config)			\
	__regmap_lockdep_wrapper(__regmap_init_mmio_clk, #config,	\
				dev, clk_id, regs, config)

/**
 * regmap_init_mmio(): Initialise register map
 *
 * @dev: Device that will be interacted with
 * @regs: Pointer to memory-mapped IO region
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer to
 * a struct regmap.
 */
#define regmap_init_mmio(dev, regs, config)		\
	regmap_init_mmio_clk(dev, NULL, regs, config)

/**
 * 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.
 */
#define regmap_init_ac97(ac97, config)					\
	__regmap_lockdep_wrapper(__regmap_init_ac97, #config,		\
				ac97, config)
bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);

/**
 * devm_regmap_init(): Initialise managed register map
 *
 * @dev: Device that will be interacted with
 * @bus: Bus-specific callbacks to use with device
 * @bus_context: Data passed to bus-specific callbacks
 * @config: Configuration for register map
 *
 * The return value will be an ERR_PTR() on error or a valid pointer
 * to a struct regmap.  This function should generally not be called
 * directly, it should be called by bus-specific init functions.  The
 * map will be automatically freed by the device management code.
 */
#define devm_regmap_init(dev, bus, bus_context, config)			\
	__regmap_lockdep_wrapper(__devm_regmap_init, #config,		\
				dev, bus, bus_context, config)

/**
 * devm_regmap_init_i2c(): Initialise managed register map
 *
 * @i2c: 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.
 */
#define devm_regmap_init_i2c(i2c, config)				\
	__regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config,	\
				i2c, config)

/**
 * devm_regmap_init_spi(): Initialise register map
 *
 * @spi: 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 map will be automatically freed by the
 * device management code.
 */
#define devm_regmap_init_spi(dev, config)				\
	__regmap_lockdep_wrapper(__devm_regmap_init_spi, #config,	\
				dev, config)

/**
 * devm_regmap_init_spmi_base(): Create managed regmap for Base register space
 * @sdev:	SPMI 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.
 */
#define devm_regmap_init_spmi_base(dev, config)				\
	__regmap_lockdep_wrapper(__devm_regmap_init_spmi_base, #config,	\
				dev, config)

/**
 * devm_regmap_init_spmi_ext(): Create managed regmap for Ext register space
 * @sdev:	SPMI 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.
 */
#define devm_regmap_init_spmi_ext(dev, config)				\
	__regmap_lockdep_wrapper(__devm_regmap_init_spmi_ext, #config,	\
				dev, config)

/**
 * devm_regmap_init_mmio_clk(): Initialise managed register map with clock
 *
 * @dev: Device that will be interacted with
 * @clk_id: register clock consumer ID
 * @regs: Pointer to memory-mapped IO region
 * @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.
 */
#define devm_regmap_init_mmio_clk(dev, clk_id, regs, config)		\
	__regmap_lockdep_wrapper(__devm_regmap_init_mmio_clk, #config,	\
				dev, clk_id, regs, config)

/**
 * devm_regmap_init_mmio(): Initialise managed register map
 *
 * @dev: Device that will be interacted with
 * @regs: Pointer to memory-mapped IO region
 * @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.
 */
#define devm_regmap_init_mmio(dev, regs, config)		\
	devm_regmap_init_mmio_clk(dev, NULL, regs, config)

/**
 * 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.
 */
#define devm_regmap_init_ac97(ac97, config)				\
	__regmap_lockdep_wrapper(__devm_regmap_init_ac97, #config,	\
				ac97, config)

void regmap_exit(struct regmap *map);
int regmap_reinit_cache(struct regmap *map,
			const struct regmap_config *config);
struct regmap *dev_get_regmap(struct device *dev, const char *name);
struct device *regmap_get_device(struct regmap *map);
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_raw_write(struct regmap *map, unsigned int reg,
		     const void *val, size_t val_len);
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
			size_t val_count);
int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
			int num_regs);
int regmap_multi_reg_write_bypassed(struct regmap *map,
				    const struct reg_sequence *regs,
				    int num_regs);
int regmap_raw_write_async(struct regmap *map, unsigned int reg,
			   const void *val, size_t val_len);
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
int regmap_raw_read(struct regmap *map, unsigned int reg,
		    void *val, size_t val_len);
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
		     size_t val_count);
int regmap_update_bits_base(struct regmap *map, unsigned int reg,
			    unsigned int mask, unsigned int val,
			    bool *change, bool async, bool force);
int regmap_write_bits(struct regmap *map, unsigned int reg,
		       unsigned int mask, unsigned int val);
int regmap_get_val_bytes(struct regmap *map);
int regmap_get_max_register(struct regmap *map);
int regmap_get_reg_stride(struct regmap *map);
int regmap_async_complete(struct regmap *map);
bool regmap_can_raw_write(struct regmap *map);
size_t regmap_get_raw_read_max(struct regmap *map);
size_t regmap_get_raw_write_max(struct regmap *map);

int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
			 unsigned int max);
int regcache_drop_region(struct regmap *map, unsigned int min,
			 unsigned int max);
void regcache_cache_only(struct regmap *map, bool enable);
void regcache_cache_bypass(struct regmap *map, bool enable);
void regcache_mark_dirty(struct regmap *map);

bool regmap_check_range_table(struct regmap *map, unsigned int reg,
			      const struct regmap_access_table *table);

int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
			  int num_regs);
int regmap_parse_val(struct regmap *map, const void *buf,
				unsigned int *val);

static inline bool regmap_reg_in_range(unsigned int reg,
				       const struct regmap_range *range)
{
	return reg >= range->range_min && reg <= range->range_max;
}

bool regmap_reg_in_ranges(unsigned int reg,
			  const struct regmap_range *ranges,
			  unsigned int nranges);

/**
 * Description of an register field
 *
 * @reg: Offset of the register within the regmap bank
 * @lsb: lsb of the register field.
 * @msb: msb of the register field.
 * @id_size: port size if it has some ports
 * @id_offset: address offset for each ports
 */
struct reg_field {
	unsigned int reg;
	unsigned int lsb;
	unsigned int msb;
	unsigned int id_size;
	unsigned int id_offset;
};

#define REG_FIELD(_reg, _lsb, _msb) {		\
				.reg = _reg,	\
				.lsb = _lsb,	\
				.msb = _msb,	\
				}

struct regmap_field *regmap_field_alloc(struct regmap *regmap,
		struct reg_field reg_field);
void regmap_field_free(struct regmap_field *field);

struct regmap_field *devm_regmap_field_alloc(struct device *dev,
		struct regmap *regmap, struct reg_field reg_field);
void devm_regmap_field_free(struct device *dev,	struct regmap_field *field);

int regmap_field_read(struct regmap_field *field, unsigned int *val);
int regmap_field_update_bits_base(struct regmap_field *field,
				  unsigned int mask, unsigned int val,
				  bool *change, bool async, bool force);
int regmap_fields_force_write(struct regmap_field *field, unsigned int id,
			unsigned int val);
int regmap_fields_read(struct regmap_field *field, unsigned int id,
		       unsigned int *val);
int regmap_fields_update_bits_base(struct regmap_field *field,  unsigned int id,
				   unsigned int mask, unsigned int val,
				   bool *change, bool async, bool force);

/**
 * Description of an IRQ for the generic regmap irq_chip.
 *
 * @reg_offset: Offset of the status/mask register within the bank
 * @mask:       Mask used to flag/control the register.
 * @type_reg_offset: Offset register for the irq type setting.
 * @type_rising_mask: Mask bit to configure RISING type irq.
 * @type_falling_mask: Mask bit to configure FALLING type irq.
 */
struct regmap_irq {
	unsigned int reg_offset;
	unsigned int mask;
	unsigned int type_reg_offset;
	unsigned int type_rising_mask;
	unsigned int type_falling_mask;
};

#define REGMAP_IRQ_REG(_irq, _off, _mask)		\
	[_irq] = { .reg_offset = (_off), .mask = (_mask) }

/**
 * Description of a generic regmap irq_chip.  This is not intended to
 * handle every possible interrupt controller, but it should handle a
 * substantial proportion of those that are found in the wild.
 *
 * @name:        Descriptive name for IRQ controller.
 *
 * @status_base: Base status register address.
 * @mask_base:   Base mask register address.
 * @unmask_base:  Base unmask register address. for chips who have
 *                separate mask and unmask registers
 * @ack_base:    Base ack address. If zero then the chip is clear on read.
 *               Using zero value is possible with @use_ack bit.
 * @wake_base:   Base address for wake enables.  If zero unsupported.
 * @type_base:   Base address for irq type.  If zero unsupported.
 * @irq_reg_stride:  Stride to use for chips where registers are not contiguous.
 * @init_ack_masked: Ack all masked interrupts once during initalization.
 * @mask_invert: Inverted mask register: cleared bits are masked out.
 * @use_ack:     Use @ack register even if it is zero.
 * @ack_invert:  Inverted ack register: cleared bits for ack.
 * @wake_invert: Inverted wake register: cleared bits are wake enabled.
 * @type_invert: Invert the type flags.
 * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
 *
 * @num_regs:    Number of registers in each control bank.
 * @irqs:        Descriptors for individual IRQs.  Interrupt numbers are
 *               assigned based on the index in the array of the interrupt.
 * @num_irqs:    Number of descriptors.
 * @num_type_reg:    Number of type registers.
 * @type_reg_stride: Stride to use for chips where type registers are not
 *			contiguous.
 */
struct regmap_irq_chip {
	const char *name;

	unsigned int status_base;
	unsigned int mask_base;
	unsigned int unmask_base;
	unsigned int ack_base;
	unsigned int wake_base;
	unsigned int type_base;
	unsigned int irq_reg_stride;
	bool init_ack_masked:1;
	bool mask_invert:1;
	bool use_ack:1;
	bool ack_invert:1;
	bool wake_invert:1;
	bool runtime_pm:1;
	bool type_invert:1;

	int num_regs;

	const struct regmap_irq *irqs;
	int num_irqs;

	int num_type_reg;
	unsigned int type_reg_stride;
};

struct regmap_irq_chip_data;

int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
			int irq_base, const struct regmap_irq_chip *chip,
			struct regmap_irq_chip_data **data);
void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);
int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);
int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq);
struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data);

#else

/*
 * These stubs should only ever be called by generic code which has
 * regmap based facilities, if they ever get called at runtime
 * something is going wrong and something probably needs to select
 * REGMAP.
 */

static inline int regmap_write(struct regmap *map, unsigned int reg,
			       unsigned int val)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_write_async(struct regmap *map, unsigned int reg,
				     unsigned int val)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_raw_write(struct regmap *map, unsigned int reg,
				   const void *val, size_t val_len)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_raw_write_async(struct regmap *map, unsigned int reg,
					 const void *val, size_t val_len)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_bulk_write(struct regmap *map, unsigned int reg,
				    const void *val, size_t val_count)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_read(struct regmap *map, unsigned int reg,
			      unsigned int *val)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_raw_read(struct regmap *map, unsigned int reg,
				  void *val, size_t val_len)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_bulk_read(struct regmap *map, unsigned int reg,
				   void *val, size_t val_count)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_update_bits_base(struct regmap *map, unsigned int reg,
					  unsigned int mask, unsigned int val,
					  bool *change, bool async, bool force)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_write_bits(struct regmap *map, unsigned int reg,
				     unsigned int mask, unsigned int val)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_field_update_bits_base(struct regmap_field *field,
					unsigned int mask, unsigned int val,
					bool *change, bool async, bool force)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_fields_update_bits_base(struct regmap_field *field,
				   unsigned int id,
				   unsigned int mask, unsigned int val,
				   bool *change, bool async, bool force)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_get_val_bytes(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_get_max_register(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_get_reg_stride(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regcache_sync(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regcache_sync_region(struct regmap *map, unsigned int min,
				       unsigned int max)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regcache_drop_region(struct regmap *map, unsigned int min,
				       unsigned int max)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline void regcache_cache_only(struct regmap *map, bool enable)
{
	WARN_ONCE(1, "regmap API is disabled");
}

static inline void regcache_cache_bypass(struct regmap *map, bool enable)
{
	WARN_ONCE(1, "regmap API is disabled");
}

static inline void regcache_mark_dirty(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
}

static inline void regmap_async_complete(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
}

static inline int regmap_register_patch(struct regmap *map,
					const struct reg_sequence *regs,
					int num_regs)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline int regmap_parse_val(struct regmap *map, const void *buf,
				unsigned int *val)
{
	WARN_ONCE(1, "regmap API is disabled");
	return -EINVAL;
}

static inline struct regmap *dev_get_regmap(struct device *dev,
					    const char *name)
{
	return NULL;
}

static inline struct device *regmap_get_device(struct regmap *map)
{
	WARN_ONCE(1, "regmap API is disabled");
	return NULL;
}

#endif

#endif