| #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/device.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| |
| struct i2c_client; |
| struct spi_device; |
| |
| /** |
| * 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; |
| }; |
| |
| /** |
| * Configuration for the register map of a device. |
| * |
| * @reg_bits: Number of bits in a register address, mandatory. |
| * @val_bits: Number of bits in a register value, mandatory. |
| * |
| * @writeable_reg: Optional callback returning true if the register |
| * can be written to. |
| * @readable_reg: Optional callback returning true if the register |
| * can be read from. |
| * @volatile_reg: Optional callback returning true if the register |
| * value can't be cached. |
| * @precious_reg: Optional callback returning true if the rgister |
| * should not be read outside of a call from the driver |
| * (eg, a clear on read interrupt status register). |
| * |
| * @max_register: Optional, specifies the maximum valid register index. |
| * @reg_defaults: Power on reset values for registers (for use with |
| * register cache support). |
| * @num_reg_defaults: Number of elements in reg_defaults. |
| */ |
| struct regmap_config { |
| int reg_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); |
| |
| unsigned int max_register; |
| struct reg_default *reg_defaults; |
| int num_reg_defaults; |
| }; |
| |
| typedef int (*regmap_hw_write)(struct device *dev, const void *data, |
| size_t count); |
| typedef int (*regmap_hw_gather_write)(struct device *dev, |
| const void *reg, size_t reg_len, |
| const void *val, size_t val_len); |
| typedef int (*regmap_hw_read)(struct device *dev, |
| const void *reg_buf, size_t reg_size, |
| void *val_buf, size_t val_size); |
| |
| /** |
| * Description of a hardware bus for the register map infrastructure. |
| * |
| * @write: Write operation. |
| * @gather_write: Write operation with split register/value, return -ENOTSUPP |
| * if not implemented on a given device. |
| * @read: Read operation. Data is returned in the buffer used to transmit |
| * data. |
| * @read_flag_mask: Mask to be set in the top byte of the register when doing |
| * a read. |
| */ |
| struct regmap_bus { |
| regmap_hw_write write; |
| regmap_hw_gather_write gather_write; |
| regmap_hw_read read; |
| u8 read_flag_mask; |
| }; |
| |
| struct regmap *regmap_init(struct device *dev, |
| const struct regmap_bus *bus, |
| const struct regmap_config *config); |
| struct regmap *regmap_init_i2c(struct i2c_client *i2c, |
| const struct regmap_config *config); |
| struct regmap *regmap_init_spi(struct spi_device *dev, |
| const struct regmap_config *config); |
| |
| void regmap_exit(struct regmap *map); |
| int regmap_write(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_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(struct regmap *map, unsigned int reg, |
| unsigned int mask, unsigned int val); |
| |
| #endif |