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, &regmap_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/init.h>
16#include <linux/module.h>
17
18static int regmap_spi_write(void *context, const void *data, size_t count)
19{
20	struct device *dev = context;
21	struct spi_device *spi = to_spi_device(dev);
22
23	return spi_write(spi, data, count);
24}
25
26static int regmap_spi_gather_write(void *context,
27				   const void *reg, size_t reg_len,
28				   const void *val, size_t val_len)
29{
30	struct device *dev = context;
31	struct spi_device *spi = to_spi_device(dev);
32	struct spi_message m;
33	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
34				     { .tx_buf = val, .len = val_len, }, };
35
36	spi_message_init(&m);
37	spi_message_add_tail(&t[0], &m);
38	spi_message_add_tail(&t[1], &m);
39
40	return spi_sync(spi, &m);
41}
42
43static int regmap_spi_read(void *context,
44			   const void *reg, size_t reg_size,
45			   void *val, size_t val_size)
46{
47	struct device *dev = context;
48	struct spi_device *spi = to_spi_device(dev);
49
50	return spi_write_then_read(spi, reg, reg_size, val, val_size);
51}
52
53static struct regmap_bus regmap_spi = {
 
54	.write = regmap_spi_write,
55	.gather_write = regmap_spi_gather_write,
56	.read = regmap_spi_read,
 
57	.read_flag_mask = 0x80,
58};
59
60/**
61 * regmap_init_spi(): Initialise register map
62 *
63 * @spi: Device that will be interacted with
64 * @config: Configuration for register map
65 *
66 * The return value will be an ERR_PTR() on error or a valid pointer to
67 * a struct regmap.
68 */
69struct regmap *regmap_init_spi(struct spi_device *spi,
70			       const struct regmap_config *config)
71{
72	return regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
73}
74EXPORT_SYMBOL_GPL(regmap_init_spi);
75
76/**
77 * devm_regmap_init_spi(): Initialise register map
78 *
79 * @spi: Device that will be interacted with
80 * @config: Configuration for register map
81 *
82 * The return value will be an ERR_PTR() on error or a valid pointer
83 * to a struct regmap.  The map will be automatically freed by the
84 * device management code.
85 */
86struct regmap *devm_regmap_init_spi(struct spi_device *spi,
87				    const struct regmap_config *config)
88{
89	return devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
90}
91EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
92
93MODULE_LICENSE("GPL");