1// SPDX-License-Identifier: GPL-2.0
2// Copyright(c) 2015-17 Intel Corporation.
3
4#include <linux/device.h>
5#include <linux/module.h>
6#include <linux/soundwire/sdw.h>
7#include "internal.h"
8
9static int regmap_sdw_write(void *context, unsigned int reg, unsigned int val)
10{
11	struct device *dev = context;
12	struct sdw_slave *slave = dev_to_sdw_dev(dev);
13
14	return sdw_write_no_pm(slave, reg, val);
15}
16
17static int regmap_sdw_read(void *context, unsigned int reg, unsigned int *val)
18{
19	struct device *dev = context;
20	struct sdw_slave *slave = dev_to_sdw_dev(dev);
21	int read;
22
23	read = sdw_read_no_pm(slave, reg);
24	if (read < 0)
25		return read;
26
27	*val = read;
28	return 0;
29}
30
31static struct regmap_bus regmap_sdw = {
32	.reg_read = regmap_sdw_read,
33	.reg_write = regmap_sdw_write,
34	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
35	.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
36};
37
38static int regmap_sdw_config_check(const struct regmap_config *config)
39{
40	/* All register are 8-bits wide as per MIPI Soundwire 1.0 Spec */
41	if (config->val_bits != 8)
42		return -ENOTSUPP;
43
44	/* Registers are 32 bits wide */
45	if (config->reg_bits != 32)
46		return -ENOTSUPP;
47
48	if (config->pad_bits != 0)
49		return -ENOTSUPP;
50
51	return 0;
52}
53
54struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
55				 const struct regmap_config *config,
56				 struct lock_class_key *lock_key,
57				 const char *lock_name)
58{
59	int ret;
60
61	ret = regmap_sdw_config_check(config);
62	if (ret)
63		return ERR_PTR(ret);
64
65	return __regmap_init(&sdw->dev, &regmap_sdw,
66			&sdw->dev, config, lock_key, lock_name);
67}
68EXPORT_SYMBOL_GPL(__regmap_init_sdw);
69
70struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
71				      const struct regmap_config *config,
72				      struct lock_class_key *lock_key,
73				      const char *lock_name)
74{
75	int ret;
76
77	ret = regmap_sdw_config_check(config);
78	if (ret)
79		return ERR_PTR(ret);
80
81	return __devm_regmap_init(&sdw->dev, &regmap_sdw,
82			&sdw->dev, config, lock_key, lock_name);
83}
84EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
85
86MODULE_DESCRIPTION("Regmap SoundWire Module");
87MODULE_LICENSE("GPL v2");
88