regmap-i3c.c

 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 *__devm_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 __devm_regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
55				  lock_key, lock_name);
56}
57EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
58
59MODULE_AUTHOR("Vitor Soares <vitor.soares@synopsys.com>");
60MODULE_DESCRIPTION("regmap I3C Module");
61MODULE_LICENSE("GPL v2");