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71 lines · 1.8 KiB

1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
3
4#include <linux/array_size.h>
5#include <linux/regmap.h>
6#include <linux/i3c/device.h>
7#include <linux/i3c/master.h>
8#include <linux/module.h>
9
10static int regmap_i3c_write(void *context, const void *data, size_t count)
11{
12 struct device *dev = context;
13 struct i3c_device *i3c = dev_to_i3cdev(dev);
14 struct i3c_xfer xfers[] = {
15 {
16 .rnw = false,
17 .len = count,
18 .data.out = data,
19 },
20 };
21
22 return i3c_device_do_xfers(i3c, xfers, ARRAY_SIZE(xfers), I3C_SDR);
23}
24
25static int regmap_i3c_read(void *context,
26 const void *reg, size_t reg_size,
27 void *val, size_t val_size)
28{
29 struct device *dev = context;
30 struct i3c_device *i3c = dev_to_i3cdev(dev);
31 struct i3c_xfer xfers[2];
32
33 xfers[0].rnw = false;
34 xfers[0].len = reg_size;
35 xfers[0].data.out = reg;
36
37 xfers[1].rnw = true;
38 xfers[1].len = val_size;
39 xfers[1].data.in = val;
40
41 return i3c_device_do_xfers(i3c, xfers, ARRAY_SIZE(xfers), I3C_SDR);
42}
43
44static const struct regmap_bus regmap_i3c = {
45 .write = regmap_i3c_write,
46 .read = regmap_i3c_read,
47};
48
49struct regmap *__regmap_init_i3c(struct i3c_device *i3c,
50 const struct regmap_config *config,
51 struct lock_class_key *lock_key,
52 const char *lock_name)
53{
54 return __regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
55 lock_key, lock_name);
56}
57EXPORT_SYMBOL_GPL(__regmap_init_i3c);
58
59struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
60 const struct regmap_config *config,
61 struct lock_class_key *lock_key,
62 const char *lock_name)
63{
64 return __devm_regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
65 lock_key, lock_name);
66}
67EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
68
69MODULE_AUTHOR("Vitor Soares <[email protected]>");
70MODULE_DESCRIPTION("regmap I3C Module");
71MODULE_LICENSE("GPL v2");