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1 | /* |
2 | * soc-io.c -- ASoC register I/O helpers | |
3 | * | |
4 | * Copyright 2009-2011 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/i2c.h> | |
15 | #include <linux/spi/spi.h> | |
be3ea3b9 | 16 | #include <linux/regmap.h> |
d81a6d71 | 17 | #include <linux/export.h> |
5bef44f9 MB |
18 | #include <sound/soc.h> |
19 | ||
20 | #include <trace/events/asoc.h> | |
21 | ||
4835ff9a | 22 | #ifdef CONFIG_REGMAP |
be3ea3b9 MB |
23 | static int hw_write(struct snd_soc_codec *codec, unsigned int reg, |
24 | unsigned int value) | |
5bef44f9 MB |
25 | { |
26 | int ret; | |
27 | ||
28 | if (!snd_soc_codec_volatile_register(codec, reg) && | |
29 | reg < codec->driver->reg_cache_size && | |
30 | !codec->cache_bypass) { | |
31 | ret = snd_soc_cache_write(codec, reg, value); | |
32 | if (ret < 0) | |
33 | return -1; | |
34 | } | |
35 | ||
36 | if (codec->cache_only) { | |
37 | codec->cache_sync = 1; | |
38 | return 0; | |
39 | } | |
40 | ||
be3ea3b9 | 41 | return regmap_write(codec->control_data, reg, value); |
5bef44f9 MB |
42 | } |
43 | ||
44 | static unsigned int hw_read(struct snd_soc_codec *codec, unsigned int reg) | |
45 | { | |
46 | int ret; | |
47 | unsigned int val; | |
48 | ||
49 | if (reg >= codec->driver->reg_cache_size || | |
50 | snd_soc_codec_volatile_register(codec, reg) || | |
51 | codec->cache_bypass) { | |
52 | if (codec->cache_only) | |
53 | return -1; | |
54 | ||
be3ea3b9 MB |
55 | ret = regmap_read(codec->control_data, reg, &val); |
56 | if (ret == 0) | |
57 | return val; | |
58 | else | |
3ebb5c9b | 59 | return -1; |
5bef44f9 MB |
60 | } |
61 | ||
62 | ret = snd_soc_cache_read(codec, reg, &val); | |
63 | if (ret < 0) | |
64 | return -1; | |
65 | return val; | |
66 | } | |
67 | ||
5bef44f9 | 68 | /* Primitive bulk write support for soc-cache. The data pointed to by |
be3ea3b9 MB |
69 | * `data' needs to already be in the form the hardware expects. Any |
70 | * data written through this function will not go through the cache as | |
71 | * it only handles writing to volatile or out of bounds registers. | |
72 | * | |
73 | * This is currently only supported for devices using the regmap API | |
74 | * wrappers. | |
5bef44f9 | 75 | */ |
be3ea3b9 MB |
76 | static int snd_soc_hw_bulk_write_raw(struct snd_soc_codec *codec, |
77 | unsigned int reg, | |
5bef44f9 MB |
78 | const void *data, size_t len) |
79 | { | |
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80 | /* To ensure that we don't get out of sync with the cache, check |
81 | * whether the base register is volatile or if we've directly asked | |
82 | * to bypass the cache. Out of bounds registers are considered | |
83 | * volatile. | |
84 | */ | |
85 | if (!codec->cache_bypass | |
86 | && !snd_soc_codec_volatile_register(codec, reg) | |
87 | && reg < codec->driver->reg_cache_size) | |
88 | return -EINVAL; | |
89 | ||
be3ea3b9 | 90 | return regmap_raw_write(codec->control_data, reg, data, len); |
5bef44f9 MB |
91 | } |
92 | ||
5bef44f9 MB |
93 | /** |
94 | * snd_soc_codec_set_cache_io: Set up standard I/O functions. | |
95 | * | |
96 | * @codec: CODEC to configure. | |
97 | * @addr_bits: Number of bits of register address data. | |
98 | * @data_bits: Number of bits of data per register. | |
99 | * @control: Control bus used. | |
100 | * | |
101 | * Register formats are frequently shared between many I2C and SPI | |
102 | * devices. In order to promote code reuse the ASoC core provides | |
103 | * some standard implementations of CODEC read and write operations | |
104 | * which can be set up using this function. | |
105 | * | |
106 | * The caller is responsible for allocating and initialising the | |
107 | * actual cache. | |
108 | * | |
109 | * Note that at present this code cannot be used by CODECs with | |
110 | * volatile registers. | |
111 | */ | |
112 | int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, | |
113 | int addr_bits, int data_bits, | |
114 | enum snd_soc_control_type control) | |
115 | { | |
be3ea3b9 | 116 | struct regmap_config config; |
2b4bdee2 | 117 | int ret; |
5bef44f9 | 118 | |
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119 | memset(&config, 0, sizeof(config)); |
120 | codec->write = hw_write; | |
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121 | codec->read = hw_read; |
122 | codec->bulk_write_raw = snd_soc_hw_bulk_write_raw; | |
123 | ||
be3ea3b9 MB |
124 | config.reg_bits = addr_bits; |
125 | config.val_bits = data_bits; | |
126 | ||
5bef44f9 | 127 | switch (control) { |
81bca762 | 128 | #if defined(CONFIG_REGMAP_I2C) || defined(CONFIG_REGMAP_I2C_MODULE) |
5bef44f9 | 129 | case SND_SOC_I2C: |
be3ea3b9 MB |
130 | codec->control_data = regmap_init_i2c(to_i2c_client(codec->dev), |
131 | &config); | |
5bef44f9 | 132 | break; |
f024d9a0 | 133 | #endif |
5bef44f9 | 134 | |
81bca762 | 135 | #if defined(CONFIG_REGMAP_SPI) || defined(CONFIG_REGMAP_SPI_MODULE) |
5bef44f9 | 136 | case SND_SOC_SPI: |
be3ea3b9 MB |
137 | codec->control_data = regmap_init_spi(to_spi_device(codec->dev), |
138 | &config); | |
5bef44f9 | 139 | break; |
f024d9a0 | 140 | #endif |
be3ea3b9 | 141 | |
0671da18 MB |
142 | case SND_SOC_REGMAP: |
143 | /* Device has made its own regmap arrangements */ | |
8a713da8 | 144 | codec->using_regmap = true; |
210cb67c MB |
145 | if (!codec->control_data) |
146 | codec->control_data = dev_get_regmap(codec->dev, NULL); | |
2b4bdee2 | 147 | |
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148 | if (codec->control_data) { |
149 | ret = regmap_get_val_bytes(codec->control_data); | |
150 | /* Errors are legitimate for non-integer byte | |
151 | * multiples */ | |
152 | if (ret > 0) | |
153 | codec->val_bytes = ret; | |
154 | } | |
0671da18 MB |
155 | break; |
156 | ||
be3ea3b9 MB |
157 | default: |
158 | return -EINVAL; | |
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159 | } |
160 | ||
8c6ffba0 | 161 | return PTR_ERR_OR_ZERO(codec->control_data); |
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162 | } |
163 | EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io); | |
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164 | #else |
165 | int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, | |
166 | int addr_bits, int data_bits, | |
167 | enum snd_soc_control_type control) | |
168 | { | |
169 | return -ENOTSUPP; | |
170 | } | |
171 | EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io); | |
172 | #endif |