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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 | |
9fabe24e DP |
23 | /* An enum of all the supported cache types */ |
24 | enum regcache_type { | |
25 | REGCACHE_NONE, | |
195af65c | 26 | REGCACHE_INDEXED, |
28644c80 | 27 | REGCACHE_RBTREE, |
2cbbb579 | 28 | REGCACHE_LZO |
9fabe24e DP |
29 | }; |
30 | ||
bd20eb54 MB |
31 | /** |
32 | * Default value for a register. We use an array of structs rather | |
33 | * than a simple array as many modern devices have very sparse | |
34 | * register maps. | |
35 | * | |
36 | * @reg: Register address. | |
37 | * @def: Register default value. | |
38 | */ | |
39 | struct reg_default { | |
40 | unsigned int reg; | |
41 | unsigned int def; | |
42 | }; | |
43 | ||
dd898b20 MB |
44 | /** |
45 | * Configuration for the register map of a device. | |
46 | * | |
47 | * @reg_bits: Number of bits in a register address, mandatory. | |
48 | * @val_bits: Number of bits in a register value, mandatory. | |
2e2ae66d | 49 | * |
3566cc9d MB |
50 | * @writeable_reg: Optional callback returning true if the register |
51 | * can be written to. | |
52 | * @readable_reg: Optional callback returning true if the register | |
53 | * can be read from. | |
54 | * @volatile_reg: Optional callback returning true if the register | |
55 | * value can't be cached. | |
56 | * @precious_reg: Optional callback returning true if the rgister | |
57 | * should not be read outside of a call from the driver | |
58 | * (eg, a clear on read interrupt status register). | |
bd20eb54 MB |
59 | * |
60 | * @max_register: Optional, specifies the maximum valid register index. | |
61 | * @reg_defaults: Power on reset values for registers (for use with | |
62 | * register cache support). | |
63 | * @num_reg_defaults: Number of elements in reg_defaults. | |
6f306441 LPC |
64 | * |
65 | * @read_flag_mask: Mask to be set in the top byte of the register when doing | |
66 | * a read. | |
67 | * @write_flag_mask: Mask to be set in the top byte of the register when doing | |
68 | * a write. If both read_flag_mask and write_flag_mask are | |
69 | * empty the regmap_bus default masks are used. | |
9fabe24e DP |
70 | * |
71 | * @cache_type: The actual cache type. | |
72 | * @reg_defaults_raw: Power on reset values for registers (for use with | |
73 | * register cache support). | |
74 | * @num_reg_defaults_raw: Number of elements in reg_defaults_raw. | |
dd898b20 | 75 | */ |
b83a313b MB |
76 | struct regmap_config { |
77 | int reg_bits; | |
78 | int val_bits; | |
2e2ae66d | 79 | |
2e2ae66d MB |
80 | bool (*writeable_reg)(struct device *dev, unsigned int reg); |
81 | bool (*readable_reg)(struct device *dev, unsigned int reg); | |
82 | bool (*volatile_reg)(struct device *dev, unsigned int reg); | |
18694886 | 83 | bool (*precious_reg)(struct device *dev, unsigned int reg); |
bd20eb54 MB |
84 | |
85 | unsigned int max_register; | |
86 | struct reg_default *reg_defaults; | |
9fabe24e DP |
87 | unsigned int num_reg_defaults; |
88 | enum regcache_type cache_type; | |
89 | const void *reg_defaults_raw; | |
90 | unsigned int num_reg_defaults_raw; | |
6f306441 LPC |
91 | |
92 | u8 read_flag_mask; | |
93 | u8 write_flag_mask; | |
b83a313b MB |
94 | }; |
95 | ||
96 | typedef int (*regmap_hw_write)(struct device *dev, const void *data, | |
97 | size_t count); | |
98 | typedef int (*regmap_hw_gather_write)(struct device *dev, | |
99 | const void *reg, size_t reg_len, | |
100 | const void *val, size_t val_len); | |
101 | typedef int (*regmap_hw_read)(struct device *dev, | |
102 | const void *reg_buf, size_t reg_size, | |
103 | void *val_buf, size_t val_size); | |
104 | ||
105 | /** | |
106 | * Description of a hardware bus for the register map infrastructure. | |
107 | * | |
b83a313b MB |
108 | * @write: Write operation. |
109 | * @gather_write: Write operation with split register/value, return -ENOTSUPP | |
110 | * if not implemented on a given device. | |
111 | * @read: Read operation. Data is returned in the buffer used to transmit | |
112 | * data. | |
b83a313b MB |
113 | * @read_flag_mask: Mask to be set in the top byte of the register when doing |
114 | * a read. | |
115 | */ | |
116 | struct regmap_bus { | |
b83a313b MB |
117 | regmap_hw_write write; |
118 | regmap_hw_gather_write gather_write; | |
119 | regmap_hw_read read; | |
b83a313b MB |
120 | u8 read_flag_mask; |
121 | }; | |
122 | ||
123 | struct regmap *regmap_init(struct device *dev, | |
124 | const struct regmap_bus *bus, | |
125 | const struct regmap_config *config); | |
9943fa30 MB |
126 | struct regmap *regmap_init_i2c(struct i2c_client *i2c, |
127 | const struct regmap_config *config); | |
a676f083 MB |
128 | struct regmap *regmap_init_spi(struct spi_device *dev, |
129 | const struct regmap_config *config); | |
130 | ||
b83a313b MB |
131 | void regmap_exit(struct regmap *map); |
132 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val); | |
133 | int regmap_raw_write(struct regmap *map, unsigned int reg, | |
134 | const void *val, size_t val_len); | |
135 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val); | |
136 | int regmap_raw_read(struct regmap *map, unsigned int reg, | |
137 | void *val, size_t val_len); | |
138 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, | |
139 | size_t val_count); | |
140 | int regmap_update_bits(struct regmap *map, unsigned int reg, | |
141 | unsigned int mask, unsigned int val); | |
142 | ||
143 | #endif |