Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __LINUX_REGMAP_H
2#define __LINUX_REGMAP_H
3
4/*
5 * Register map access API
6 *
7 * Copyright 2011 Wolfson Microelectronics plc
8 *
9 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/device.h>
17#include <linux/list.h>
18#include <linux/module.h>
19
20struct i2c_client;
21struct spi_device;
22
23struct regmap_config {
24 int reg_bits;
25 int val_bits;
26};
27
28typedef int (*regmap_hw_write)(struct device *dev, const void *data,
29 size_t count);
30typedef int (*regmap_hw_gather_write)(struct device *dev,
31 const void *reg, size_t reg_len,
32 const void *val, size_t val_len);
33typedef int (*regmap_hw_read)(struct device *dev,
34 const void *reg_buf, size_t reg_size,
35 void *val_buf, size_t val_size);
36
37/**
38 * Description of a hardware bus for the register map infrastructure.
39 *
40 * @list: Internal use.
41 * @type: Bus type, used to identify bus to be used for a device.
42 * @write: Write operation.
43 * @gather_write: Write operation with split register/value, return -ENOTSUPP
44 * if not implemented on a given device.
45 * @read: Read operation. Data is returned in the buffer used to transmit
46 * data.
47 * @owner: Module with the bus implementation, used to pin the implementation
48 * in memory.
49 * @read_flag_mask: Mask to be set in the top byte of the register when doing
50 * a read.
51 */
52struct regmap_bus {
53 struct list_head list;
54 struct bus_type *type;
55 regmap_hw_write write;
56 regmap_hw_gather_write gather_write;
57 regmap_hw_read read;
58 struct module *owner;
59 u8 read_flag_mask;
60};
61
62struct regmap *regmap_init(struct device *dev,
63 const struct regmap_bus *bus,
64 const struct regmap_config *config);
65struct regmap *regmap_init_i2c(struct i2c_client *i2c,
66 const struct regmap_config *config);
67struct regmap *regmap_init_spi(struct spi_device *dev,
68 const struct regmap_config *config);
69
70void regmap_exit(struct regmap *map);
71int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
72int regmap_raw_write(struct regmap *map, unsigned int reg,
73 const void *val, size_t val_len);
74int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
75int regmap_raw_read(struct regmap *map, unsigned int reg,
76 void *val, size_t val_len);
77int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
78 size_t val_count);
79int regmap_update_bits(struct regmap *map, unsigned int reg,
80 unsigned int mask, unsigned int val);
81
82#endif