tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_byte_reg_read(void *context, unsigned int reg,
11 unsigned int *val)
12{
13 struct slim_device *sdev = context;
14 int v;
15
16 v = slim_readb(sdev, reg);
17
18 if (v < 0)
19 return v;
20
21 *val = v;
22
23 return 0;
24}
25
26static int regmap_slimbus_byte_reg_write(void *context, unsigned int reg,
27 unsigned int val)
28{
29 struct slim_device *sdev = context;
30
31 return slim_writeb(sdev, reg, val);
32}
33
34static struct regmap_bus regmap_slimbus_bus = {
35 .reg_write = regmap_slimbus_byte_reg_write,
36 .reg_read = regmap_slimbus_byte_reg_read,
37 .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
38 .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
39};
40
41static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim,
42 const struct regmap_config *config)
43{
44 if (config->val_bits == 8 && config->reg_bits == 16)
45 return ®map_slimbus_bus;
46
47 return ERR_PTR(-ENOTSUPP);
48}
49
50struct regmap *__regmap_init_slimbus(struct slim_device *slimbus,
51 const struct regmap_config *config,
52 struct lock_class_key *lock_key,
53 const char *lock_name)
54{
55 const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
56
57 if (IS_ERR(bus))
58 return ERR_CAST(bus);
59
60 return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config,
61 lock_key, lock_name);
62}
63EXPORT_SYMBOL_GPL(__regmap_init_slimbus);
64
65struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus,
66 const struct regmap_config *config,
67 struct lock_class_key *lock_key,
68 const char *lock_name)
69{
70 const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config);
71
72 if (IS_ERR(bus))
73 return ERR_CAST(bus);
74
75 return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config,
76 lock_key, lock_name);
77}
78EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus);
79
80MODULE_LICENSE("GPL v2");