1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* Register map access API - SPI support
*
* Copyright 2011 Wolfson Microelectronics plc
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/init.h>
#include <linux/module.h>
static int regmap_spi_write(struct device *dev, const void *data, size_t count)
{
struct spi_device *spi = to_spi_device(dev);
return spi_write(spi, data, count);
}
static int regmap_spi_gather_write(struct device *dev,
const void *reg, size_t reg_len,
const void *val, size_t val_len)
{
struct spi_device *spi = to_spi_device(dev);
struct spi_message m;
struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
{ .tx_buf = val, .len = val_len, }, };
spi_message_init(&m);
spi_message_add_tail(&t[0], &m);
spi_message_add_tail(&t[1], &m);
return spi_sync(spi, &m);
}
static int regmap_spi_read(struct device *dev,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct spi_device *spi = to_spi_device(dev);
return spi_write_then_read(spi, reg, reg_size, val, val_size);
}
static struct regmap_bus regmap_spi = {
.write = regmap_spi_write,
.gather_write = regmap_spi_gather_write,
.read = regmap_spi_read,
.read_flag_mask = 0x80,
};
/**
* regmap_init_spi(): Initialise register map
*
* @spi: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer to
* a struct regmap.
*/
struct regmap *regmap_init_spi(struct spi_device *spi,
const struct regmap_config *config)
{
return regmap_init(&spi->dev, ®map_spi, config);
}
EXPORT_SYMBOL_GPL(regmap_init_spi);
/**
* devm_regmap_init_spi(): Initialise register map
*
* @spi: Device that will be interacted with
* @config: Configuration for register map
*
* The return value will be an ERR_PTR() on error or a valid pointer
* to a struct regmap. The map will be automatically freed by the
* device management code.
*/
struct regmap *devm_regmap_init_spi(struct spi_device *spi,
const struct regmap_config *config)
{
return devm_regmap_init(&spi->dev, ®map_spi, config);
}
EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
MODULE_LICENSE("GPL");
|
