1// SPDX-License-Identifier: GPL-2.0
2// Copyright(c) 2020 Intel Corporation.
3
4#include <linux/device.h>
5#include <linux/errno.h>
6#include <linux/module.h>
7#include <linux/regmap.h>
8#include <linux/soundwire/sdw.h>
9#include <linux/soundwire/sdw_registers.h>
10#include "internal.h"
11
12static int regmap_sdw_mbq_write(void *context, unsigned int reg, unsigned int val)
13{
14	struct device *dev = context;
15	struct sdw_slave *slave = dev_to_sdw_dev(dev);
16	int ret;
17
18	ret = sdw_write_no_pm(slave, SDW_SDCA_MBQ_CTL(reg), (val >> 8) & 0xff);
19	if (ret < 0)
20		return ret;
21
22	return sdw_write_no_pm(slave, reg, val & 0xff);
23}
24
25static int regmap_sdw_mbq_read(void *context, unsigned int reg, unsigned int *val)
26{
27	struct device *dev = context;
28	struct sdw_slave *slave = dev_to_sdw_dev(dev);
29	int read0;
30	int read1;
31
32	read0 = sdw_read_no_pm(slave, reg);
33	if (read0 < 0)
34		return read0;
35
36	read1 = sdw_read_no_pm(slave, SDW_SDCA_MBQ_CTL(reg));
37	if (read1 < 0)
38		return read1;
39
40	*val = (read1 << 8) | read0;
41
42	return 0;
43}
44
45static const struct regmap_bus regmap_sdw_mbq = {
46	.reg_read = regmap_sdw_mbq_read,
47	.reg_write = regmap_sdw_mbq_write,
48	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
49	.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
50};
51
52static int regmap_sdw_mbq_config_check(const struct regmap_config *config)
53{
54	/* MBQ-based controls are only 16-bits for now */
55	if (config->val_bits != 16)
56		return -ENOTSUPP;
57
58	/* Registers are 32 bits wide */
59	if (config->reg_bits != 32)
60		return -ENOTSUPP;
61
62	if (config->pad_bits != 0)
63		return -ENOTSUPP;
64
65	return 0;
66}
67
68struct regmap *__regmap_init_sdw_mbq(struct sdw_slave *sdw,
69				     const struct regmap_config *config,
70				     struct lock_class_key *lock_key,
71				     const char *lock_name)
72{
73	int ret;
74
75	ret = regmap_sdw_mbq_config_check(config);
76	if (ret)
77		return ERR_PTR(ret);
78
79	return __regmap_init(&sdw->dev, &regmap_sdw_mbq,
80			&sdw->dev, config, lock_key, lock_name);
81}
82EXPORT_SYMBOL_GPL(__regmap_init_sdw_mbq);
83
84struct regmap *__devm_regmap_init_sdw_mbq(struct sdw_slave *sdw,
85					  const struct regmap_config *config,
86					  struct lock_class_key *lock_key,
87					  const char *lock_name)
88{
89	int ret;
90
91	ret = regmap_sdw_mbq_config_check(config);
92	if (ret)
93		return ERR_PTR(ret);
94
95	return __devm_regmap_init(&sdw->dev, &regmap_sdw_mbq,
96			&sdw->dev, config, lock_key, lock_name);
97}
98EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw_mbq);
99
100MODULE_DESCRIPTION("Regmap SoundWire MBQ Module");
101MODULE_LICENSE("GPL");
102