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
regmap_sdw_mbq_write(void * context,unsigned int reg,unsigned int val)12 static 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
regmap_sdw_mbq_read(void * context,unsigned int reg,unsigned int * val)25 static 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
45 static 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
regmap_sdw_mbq_config_check(const struct regmap_config * config)52 static 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
__regmap_init_sdw_mbq(struct sdw_slave * sdw,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)68 struct 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, ®map_sdw_mbq,
80 &sdw->dev, config, lock_key, lock_name);
81 }
82 EXPORT_SYMBOL_GPL(__regmap_init_sdw_mbq);
83
__devm_regmap_init_sdw_mbq(struct sdw_slave * sdw,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)84 struct 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, ®map_sdw_mbq,
96 &sdw->dev, config, lock_key, lock_name);
97 }
98 EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw_mbq);
99
100 MODULE_DESCRIPTION("Regmap SoundWire MBQ Module");
101 MODULE_LICENSE("GPL");
102