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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 | ||
17 | static int regmap_spi_write(struct device *dev, const void *data, size_t count) | |
18 | { | |
19 | struct spi_device *spi = to_spi_device(dev); | |
20 | ||
21 | return spi_write(spi, data, count); | |
22 | } | |
23 | ||
24 | static int regmap_spi_gather_write(struct device *dev, | |
25 | const void *reg, size_t reg_len, | |
26 | const void *val, size_t val_len) | |
27 | { | |
28 | struct spi_device *spi = to_spi_device(dev); | |
29 | struct spi_message m; | |
30 | struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, }, | |
31 | { .tx_buf = val, .len = val_len, }, }; | |
32 | ||
33 | spi_message_init(&m); | |
34 | spi_message_add_tail(&t[0], &m); | |
35 | spi_message_add_tail(&t[1], &m); | |
36 | ||
37 | return spi_sync(spi, &m); | |
38 | } | |
39 | ||
40 | static int regmap_spi_read(struct device *dev, | |
41 | const void *reg, size_t reg_size, | |
42 | void *val, size_t val_size) | |
43 | { | |
44 | struct spi_device *spi = to_spi_device(dev); | |
45 | ||
46 | return spi_write_then_read(spi, reg, reg_size, val, val_size); | |
47 | } | |
48 | ||
49 | static struct regmap_bus regmap_spi = { | |
50 | .type = &spi_bus_type, | |
51 | .write = regmap_spi_write, | |
52 | .gather_write = regmap_spi_gather_write, | |
53 | .read = regmap_spi_read, | |
54 | .owner = THIS_MODULE, | |
55 | .read_flag_mask = 0x80, | |
56 | }; | |
57 | ||
58 | /** | |
59 | * regmap_init_spi(): Initialise register map | |
60 | * | |
61 | * @spi: Device that will be interacted with | |
62 | * @config: Configuration for register map | |
63 | * | |
64 | * The return value will be an ERR_PTR() on error or a valid pointer to | |
65 | * a struct regmap. | |
66 | */ | |
67 | struct regmap *regmap_init_spi(struct spi_device *spi, | |
68 | const struct regmap_config *config) | |
69 | { | |
70 | return regmap_init(&spi->dev, ®map_spi, config); | |
71 | } | |
72 | EXPORT_SYMBOL_GPL(regmap_init_spi); |