summaryrefslogtreecommitdiffstats
path: root/drivers/base/regmap/regmap-spi.c
blob: edd9a839d004dcf98ab46b15c9002c958ad6fe56 (plain) (blame)
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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * 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/module.h>

#include "internal.h"

struct regmap_async_spi {
	struct regmap_async core;
	struct spi_message m;
	struct spi_transfer t[2];
};

static void regmap_spi_complete(void *data)
{
	struct regmap_async_spi *async = data;

	regmap_async_complete_cb(&async->core, async->m.status);
}

static int regmap_spi_write(void *context, const void *data, size_t count)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	return spi_write(spi, data, count);
}

static int regmap_spi_gather_write(void *context,
				   const void *reg, size_t reg_len,
				   const void *val, size_t val_len)
{
	struct device *dev = context;
	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_async_write(void *context,
				  const void *reg, size_t reg_len,
				  const void *val, size_t val_len,
				  struct regmap_async *a)
{
	struct regmap_async_spi *async = container_of(a,
						      struct regmap_async_spi,
						      core);
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	async->t[0].tx_buf = reg;
	async->t[0].len = reg_len;
	async->t[1].tx_buf = val;
	async->t[1].len = val_len;

	spi_message_init(&async->m);
	spi_message_add_tail(&async->t[0], &async->m);
	if (val)
		spi_message_add_tail(&async->t[1], &async->m);

	async->m.complete = regmap_spi_complete;
	async->m.context = async;

	return spi_async(spi, &async->m);
}

static struct regmap_async *regmap_spi_async_alloc(void)
{
	struct regmap_async_spi *async_spi;

	async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
	if (!async_spi)
		return NULL;

	return &async_spi->core;
}

static int regmap_spi_read(void *context,
			   const void *reg, size_t reg_size,
			   void *val, size_t val_size)
{
	struct device *dev = context;
	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,
	.async_write = regmap_spi_async_write,
	.async_alloc = regmap_spi_async_alloc,
	.read = regmap_spi_read,
	.read_flag_mask = 0x80,
	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
	.val_format_endian_default = REGMAP_ENDIAN_BIG,
};

struct regmap *__regmap_init_spi(struct spi_device *spi,
				 const struct regmap_config *config,
				 struct lock_class_key *lock_key,
				 const char *lock_name)
{
	return __regmap_init(&spi->dev, &regmap_spi, &spi->dev, config,
			     lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_spi);

struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name)
{
	return __devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config,
				  lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);

MODULE_LICENSE("GPL");