Loading...
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>
16#include <linux/module.h>
17
18static int regmap_spi_write(struct device *dev, const void *data, size_t count)
19{
20 struct spi_device *spi = to_spi_device(dev);
21
22 return spi_write(spi, data, count);
23}
24
25static int regmap_spi_gather_write(struct device *dev,
26 const void *reg, size_t reg_len,
27 const void *val, size_t val_len)
28{
29 struct spi_device *spi = to_spi_device(dev);
30 struct spi_message m;
31 struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
32 { .tx_buf = val, .len = val_len, }, };
33
34 spi_message_init(&m);
35 spi_message_add_tail(&t[0], &m);
36 spi_message_add_tail(&t[1], &m);
37
38 return spi_sync(spi, &m);
39}
40
41static int regmap_spi_read(struct device *dev,
42 const void *reg, size_t reg_size,
43 void *val, size_t val_size)
44{
45 struct spi_device *spi = to_spi_device(dev);
46
47 return spi_write_then_read(spi, reg, reg_size, val, val_size);
48}
49
50static struct regmap_bus regmap_spi = {
51 .type = &spi_bus_type,
52 .write = regmap_spi_write,
53 .gather_write = regmap_spi_gather_write,
54 .read = regmap_spi_read,
55 .owner = THIS_MODULE,
56 .read_flag_mask = 0x80,
57};
58
59/**
60 * regmap_init_spi(): Initialise register map
61 *
62 * @spi: Device that will be interacted with
63 * @config: Configuration for register map
64 *
65 * The return value will be an ERR_PTR() on error or a valid pointer to
66 * a struct regmap.
67 */
68struct regmap *regmap_init_spi(struct spi_device *spi,
69 const struct regmap_config *config)
70{
71 return regmap_init(&spi->dev, ®map_spi, config);
72}
73EXPORT_SYMBOL_GPL(regmap_init_spi);
74
75MODULE_LICENSE("GPL");
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/module.h>
16
17#include "internal.h"
18
19struct regmap_async_spi {
20 struct regmap_async core;
21 struct spi_message m;
22 struct spi_transfer t[2];
23};
24
25static void regmap_spi_complete(void *data)
26{
27 struct regmap_async_spi *async = data;
28
29 regmap_async_complete_cb(&async->core, async->m.status);
30}
31
32static int regmap_spi_write(void *context, const void *data, size_t count)
33{
34 struct device *dev = context;
35 struct spi_device *spi = to_spi_device(dev);
36
37 return spi_write(spi, data, count);
38}
39
40static int regmap_spi_gather_write(void *context,
41 const void *reg, size_t reg_len,
42 const void *val, size_t val_len)
43{
44 struct device *dev = context;
45 struct spi_device *spi = to_spi_device(dev);
46 struct spi_message m;
47 struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
48 { .tx_buf = val, .len = val_len, }, };
49
50 spi_message_init(&m);
51 spi_message_add_tail(&t[0], &m);
52 spi_message_add_tail(&t[1], &m);
53
54 return spi_sync(spi, &m);
55}
56
57static int regmap_spi_async_write(void *context,
58 const void *reg, size_t reg_len,
59 const void *val, size_t val_len,
60 struct regmap_async *a)
61{
62 struct regmap_async_spi *async = container_of(a,
63 struct regmap_async_spi,
64 core);
65 struct device *dev = context;
66 struct spi_device *spi = to_spi_device(dev);
67
68 async->t[0].tx_buf = reg;
69 async->t[0].len = reg_len;
70 async->t[1].tx_buf = val;
71 async->t[1].len = val_len;
72
73 spi_message_init(&async->m);
74 spi_message_add_tail(&async->t[0], &async->m);
75 if (val)
76 spi_message_add_tail(&async->t[1], &async->m);
77
78 async->m.complete = regmap_spi_complete;
79 async->m.context = async;
80
81 return spi_async(spi, &async->m);
82}
83
84static struct regmap_async *regmap_spi_async_alloc(void)
85{
86 struct regmap_async_spi *async_spi;
87
88 async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
89 if (!async_spi)
90 return NULL;
91
92 return &async_spi->core;
93}
94
95static int regmap_spi_read(void *context,
96 const void *reg, size_t reg_size,
97 void *val, size_t val_size)
98{
99 struct device *dev = context;
100 struct spi_device *spi = to_spi_device(dev);
101
102 return spi_write_then_read(spi, reg, reg_size, val, val_size);
103}
104
105static const struct regmap_bus regmap_spi = {
106 .write = regmap_spi_write,
107 .gather_write = regmap_spi_gather_write,
108 .async_write = regmap_spi_async_write,
109 .async_alloc = regmap_spi_async_alloc,
110 .read = regmap_spi_read,
111 .read_flag_mask = 0x80,
112 .reg_format_endian_default = REGMAP_ENDIAN_BIG,
113 .val_format_endian_default = REGMAP_ENDIAN_BIG,
114};
115
116struct regmap *__regmap_init_spi(struct spi_device *spi,
117 const struct regmap_config *config,
118 struct lock_class_key *lock_key,
119 const char *lock_name)
120{
121 return __regmap_init(&spi->dev, ®map_spi, &spi->dev, config,
122 lock_key, lock_name);
123}
124EXPORT_SYMBOL_GPL(__regmap_init_spi);
125
126struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
127 const struct regmap_config *config,
128 struct lock_class_key *lock_key,
129 const char *lock_name)
130{
131 return __devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config,
132 lock_key, lock_name);
133}
134EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);
135
136MODULE_LICENSE("GPL");