1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2017, Linaro Ltd.
3
4#include <linux/regmap.h>
5#include <linux/slimbus.h>
6#include <linux/module.h>
7
8#include "internal.h"
9
10static int regmap_slimbus_write(void *context, const void *data, size_t count)
11{
12 struct slim_device *sdev = context;
13
14 return slim_write(sdev, addr: *(u16 *)data, count: count - 2, val: (u8 *)data + 2);
15}
16
17static int regmap_slimbus_read(void *context, const void *reg, size_t reg_size,
18 void *val, size_t val_size)
19{
20 struct slim_device *sdev = context;
21
22 return slim_read(sdev, addr: *(u16 *)reg, count: val_size, val);
23}
24
25static const struct regmap_bus regmap_slimbus_bus = {
26 .write = regmap_slimbus_write,
27 .read = regmap_slimbus_read,
28 .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
29 .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
30};
31
32static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
33 const struct regmap_config *config)
34{
35 if (config->val_bits == 8 && config->reg_bits == 16)
36 return &regmap_slimbus_bus;
37
38 return ERR_PTR(error: -ENOTSUPP);
39}
40
41struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
42 const struct regmap_config *config,
43 struct lock_class_key *lock_key,
44 const char *lock_name)
45{
46 const struct regmap_bus *bus = regmap_get_slimbus(slim: slimbus, config);
47
48 if (IS_ERR(ptr: bus))
49 return ERR_CAST(ptr: bus);
50
51 return __regmap_init(dev: &slimbus->dev, bus, bus_context: slimbus, config, lock_key, lock_name);
52}
53EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
54
55struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
56 const struct regmap_config *config,
57 struct lock_class_key *lock_key,
58 const char *lock_name)
59{
60 const struct regmap_bus *bus = regmap_get_slimbus(slim: slimbus, config);
61
62 if (IS_ERR(ptr: bus))
63 return ERR_CAST(ptr: bus);
64
65 return __devm_regmap_init(dev: &slimbus->dev, bus, bus_context: slimbus, config, lock_key, lock_name);
66}
67EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
68
69MODULE_DESCRIPTION("Register map access API - SLIMbus support");
70MODULE_LICENSE("GPL v2");
71

source code of linux/drivers/base/regmap/regmap-slimbus.c