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