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1 | /* |
2 | * Register map access API - SPI support | |
3 | * | |
4 | * Copyright 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 | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/regmap.h> | |
14 | #include <linux/spi/spi.h> | |
15 | #include <linux/init.h> | |
b5ddbf46 | 16 | #include <linux/module.h> |
a676f083 | 17 | |
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18 | #include "internal.h" |
19 | ||
20 | struct regmap_async_spi { | |
21 | struct regmap_async core; | |
22 | struct spi_message m; | |
23 | struct spi_transfer t[2]; | |
24 | }; | |
25 | ||
26 | static void regmap_spi_complete(void *data) | |
27 | { | |
28 | struct regmap_async_spi *async = data; | |
29 | ||
30 | regmap_async_complete_cb(&async->core, async->m.status); | |
31 | } | |
32 | ||
0135bbcc | 33 | static int regmap_spi_write(void *context, const void *data, size_t count) |
a676f083 | 34 | { |
0135bbcc | 35 | struct device *dev = context; |
a676f083 MB |
36 | struct spi_device *spi = to_spi_device(dev); |
37 | ||
38 | return spi_write(spi, data, count); | |
39 | } | |
40 | ||
0135bbcc | 41 | static int regmap_spi_gather_write(void *context, |
a676f083 MB |
42 | const void *reg, size_t reg_len, |
43 | const void *val, size_t val_len) | |
44 | { | |
0135bbcc | 45 | struct device *dev = context; |
a676f083 MB |
46 | struct spi_device *spi = to_spi_device(dev); |
47 | struct spi_message m; | |
48 | struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, }, | |
49 | { .tx_buf = val, .len = val_len, }, }; | |
50 | ||
51 | spi_message_init(&m); | |
52 | spi_message_add_tail(&t[0], &m); | |
53 | spi_message_add_tail(&t[1], &m); | |
54 | ||
55 | return spi_sync(spi, &m); | |
56 | } | |
57 | ||
e0356dfe MB |
58 | static int regmap_spi_async_write(void *context, |
59 | const void *reg, size_t reg_len, | |
60 | const void *val, size_t val_len, | |
61 | struct regmap_async *a) | |
62 | { | |
63 | struct regmap_async_spi *async = container_of(a, | |
64 | struct regmap_async_spi, | |
65 | core); | |
66 | struct device *dev = context; | |
67 | struct spi_device *spi = to_spi_device(dev); | |
68 | ||
69 | async->t[0].tx_buf = reg; | |
70 | async->t[0].len = reg_len; | |
71 | async->t[1].tx_buf = val; | |
72 | async->t[1].len = val_len; | |
73 | ||
74 | spi_message_init(&async->m); | |
75 | spi_message_add_tail(&async->t[0], &async->m); | |
cd1b9dd0 MB |
76 | if (val) |
77 | spi_message_add_tail(&async->t[1], &async->m); | |
e0356dfe MB |
78 | |
79 | async->m.complete = regmap_spi_complete; | |
80 | async->m.context = async; | |
81 | ||
82 | return spi_async(spi, &async->m); | |
83 | } | |
84 | ||
85 | static struct regmap_async *regmap_spi_async_alloc(void) | |
86 | { | |
87 | struct regmap_async_spi *async_spi; | |
88 | ||
89 | async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL); | |
95601d65 MB |
90 | if (!async_spi) |
91 | return NULL; | |
e0356dfe MB |
92 | |
93 | return &async_spi->core; | |
94 | } | |
95 | ||
0135bbcc | 96 | static int regmap_spi_read(void *context, |
a676f083 MB |
97 | const void *reg, size_t reg_size, |
98 | void *val, size_t val_size) | |
99 | { | |
0135bbcc | 100 | struct device *dev = context; |
a676f083 MB |
101 | struct spi_device *spi = to_spi_device(dev); |
102 | ||
103 | return spi_write_then_read(spi, reg, reg_size, val, val_size); | |
104 | } | |
105 | ||
106 | static struct regmap_bus regmap_spi = { | |
a676f083 MB |
107 | .write = regmap_spi_write, |
108 | .gather_write = regmap_spi_gather_write, | |
e0356dfe MB |
109 | .async_write = regmap_spi_async_write, |
110 | .async_alloc = regmap_spi_async_alloc, | |
a676f083 | 111 | .read = regmap_spi_read, |
a676f083 MB |
112 | .read_flag_mask = 0x80, |
113 | }; | |
114 | ||
115 | /** | |
116 | * regmap_init_spi(): Initialise register map | |
117 | * | |
118 | * @spi: Device that will be interacted with | |
119 | * @config: Configuration for register map | |
120 | * | |
121 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
122 | * a struct regmap. | |
123 | */ | |
124 | struct regmap *regmap_init_spi(struct spi_device *spi, | |
125 | const struct regmap_config *config) | |
126 | { | |
0135bbcc | 127 | return regmap_init(&spi->dev, ®map_spi, &spi->dev, config); |
a676f083 MB |
128 | } |
129 | EXPORT_SYMBOL_GPL(regmap_init_spi); | |
b33f9cbd | 130 | |
c0eb4676 MB |
131 | /** |
132 | * devm_regmap_init_spi(): Initialise register map | |
133 | * | |
134 | * @spi: Device that will be interacted with | |
135 | * @config: Configuration for register map | |
136 | * | |
137 | * The return value will be an ERR_PTR() on error or a valid pointer | |
138 | * to a struct regmap. The map will be automatically freed by the | |
139 | * device management code. | |
140 | */ | |
141 | struct regmap *devm_regmap_init_spi(struct spi_device *spi, | |
142 | const struct regmap_config *config) | |
143 | { | |
0135bbcc | 144 | return devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config); |
c0eb4676 MB |
145 | } |
146 | EXPORT_SYMBOL_GPL(devm_regmap_init_spi); | |
147 | ||
b33f9cbd | 148 | MODULE_LICENSE("GPL"); |