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
regmap_sdw_write(void * context,unsigned int reg,unsigned int val)9 static 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
regmap_sdw_read(void * context,unsigned int reg,unsigned int * val)17 static 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
31 static 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
regmap_sdw_config_check(const struct regmap_config * config)38 static 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
__regmap_init_sdw(struct sdw_slave * sdw,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)54 struct 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, ®map_sdw,
66 &sdw->dev, config, lock_key, lock_name);
67 }
68 EXPORT_SYMBOL_GPL(__regmap_init_sdw);
69
__devm_regmap_init_sdw(struct sdw_slave * sdw,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)70 struct 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, ®map_sdw,
82 &sdw->dev, config, lock_key, lock_name);
83 }
84 EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
85
86 MODULE_DESCRIPTION("Regmap SoundWire Module");
87 MODULE_LICENSE("GPL v2");
88