blob: 7c0c35a39c331afa9e5c5d940e8bf16354aa4a10 [file] [log] [blame]
Mark Browna676f082011-05-12 11:42:10 +02001/*
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>
Stephen Rothwellb5ddbf42011-08-16 09:36:06 +100016#include <linux/module.h>
Mark Browna676f082011-05-12 11:42:10 +020017
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 = {
Mark Browna676f082011-05-12 11:42:10 +020051 .write = regmap_spi_write,
52 .gather_write = regmap_spi_gather_write,
53 .read = regmap_spi_read,
Mark Browna676f082011-05-12 11:42:10 +020054 .read_flag_mask = 0x80,
55};
56
57/**
58 * regmap_init_spi(): Initialise register map
59 *
60 * @spi: Device that will be interacted with
61 * @config: Configuration for register map
62 *
63 * The return value will be an ERR_PTR() on error or a valid pointer to
64 * a struct regmap.
65 */
66struct regmap *regmap_init_spi(struct spi_device *spi,
67 const struct regmap_config *config)
68{
69 return regmap_init(&spi->dev, &regmap_spi, config);
70}
71EXPORT_SYMBOL_GPL(regmap_init_spi);
Stephen Warrenb33f9cb2011-08-11 11:59:10 -060072
Mark Brownc0eb4672012-01-30 19:56:52 +000073/**
74 * devm_regmap_init_spi(): Initialise register map
75 *
76 * @spi: Device that will be interacted with
77 * @config: Configuration for register map
78 *
79 * The return value will be an ERR_PTR() on error or a valid pointer
80 * to a struct regmap. The map will be automatically freed by the
81 * device management code.
82 */
83struct regmap *devm_regmap_init_spi(struct spi_device *spi,
84 const struct regmap_config *config)
85{
86 return devm_regmap_init(&spi->dev, &regmap_spi, config);
87}
88EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
89
Stephen Warrenb33f9cb2011-08-11 11:59:10 -060090MODULE_LICENSE("GPL");