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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 | ||
9943fa30 | 20 | struct i2c_client; |
a676f083 | 21 | struct spi_device; |
9943fa30 | 22 | |
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23 | /** |
24 | * Default value for a register. We use an array of structs rather | |
25 | * than a simple array as many modern devices have very sparse | |
26 | * register maps. | |
27 | * | |
28 | * @reg: Register address. | |
29 | * @def: Register default value. | |
30 | */ | |
31 | struct reg_default { | |
32 | unsigned int reg; | |
33 | unsigned int def; | |
34 | }; | |
35 | ||
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36 | /** |
37 | * Configuration for the register map of a device. | |
38 | * | |
39 | * @reg_bits: Number of bits in a register address, mandatory. | |
40 | * @val_bits: Number of bits in a register value, mandatory. | |
2e2ae66d | 41 | * |
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42 | * @writeable_reg: Optional callback returning true if the register |
43 | * can be written to. | |
44 | * @readable_reg: Optional callback returning true if the register | |
45 | * can be read from. | |
46 | * @volatile_reg: Optional callback returning true if the register | |
47 | * value can't be cached. | |
48 | * @precious_reg: Optional callback returning true if the rgister | |
49 | * should not be read outside of a call from the driver | |
50 | * (eg, a clear on read interrupt status register). | |
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51 | * |
52 | * @max_register: Optional, specifies the maximum valid register index. | |
53 | * @reg_defaults: Power on reset values for registers (for use with | |
54 | * register cache support). | |
55 | * @num_reg_defaults: Number of elements in reg_defaults. | |
dd898b20 | 56 | */ |
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57 | struct regmap_config { |
58 | int reg_bits; | |
59 | int val_bits; | |
2e2ae66d | 60 | |
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61 | bool (*writeable_reg)(struct device *dev, unsigned int reg); |
62 | bool (*readable_reg)(struct device *dev, unsigned int reg); | |
63 | bool (*volatile_reg)(struct device *dev, unsigned int reg); | |
18694886 | 64 | bool (*precious_reg)(struct device *dev, unsigned int reg); |
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65 | |
66 | unsigned int max_register; | |
67 | struct reg_default *reg_defaults; | |
68 | int num_reg_defaults; | |
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69 | }; |
70 | ||
71 | typedef int (*regmap_hw_write)(struct device *dev, const void *data, | |
72 | size_t count); | |
73 | typedef int (*regmap_hw_gather_write)(struct device *dev, | |
74 | const void *reg, size_t reg_len, | |
75 | const void *val, size_t val_len); | |
76 | typedef int (*regmap_hw_read)(struct device *dev, | |
77 | const void *reg_buf, size_t reg_size, | |
78 | void *val_buf, size_t val_size); | |
79 | ||
80 | /** | |
81 | * Description of a hardware bus for the register map infrastructure. | |
82 | * | |
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83 | * @write: Write operation. |
84 | * @gather_write: Write operation with split register/value, return -ENOTSUPP | |
85 | * if not implemented on a given device. | |
86 | * @read: Read operation. Data is returned in the buffer used to transmit | |
87 | * data. | |
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88 | * @read_flag_mask: Mask to be set in the top byte of the register when doing |
89 | * a read. | |
90 | */ | |
91 | struct regmap_bus { | |
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92 | regmap_hw_write write; |
93 | regmap_hw_gather_write gather_write; | |
94 | regmap_hw_read read; | |
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95 | u8 read_flag_mask; |
96 | }; | |
97 | ||
98 | struct regmap *regmap_init(struct device *dev, | |
99 | const struct regmap_bus *bus, | |
100 | const struct regmap_config *config); | |
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101 | struct regmap *regmap_init_i2c(struct i2c_client *i2c, |
102 | const struct regmap_config *config); | |
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103 | struct regmap *regmap_init_spi(struct spi_device *dev, |
104 | const struct regmap_config *config); | |
105 | ||
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106 | void regmap_exit(struct regmap *map); |
107 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val); | |
108 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
109 | const void *val, size_t val_len); | |
110 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val); | |
111 | int regmap_raw_read(struct regmap *map, unsigned int reg, | |
112 | void *val, size_t val_len); | |
113 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
114 | size_t val_count); | |
115 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
116 | unsigned int mask, unsigned int val); | |
117 | ||
118 | #endif |