Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / base / regmap / regmap-spi.c
blobfe831e3ec8821453c7ea15547f04e5d184316630
1 /*
2 * Register map access API - SPI support
4 * Copyright 2011 Wolfson Microelectronics plc
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
13 #include <linux/regmap.h>
14 #include <linux/spi/spi.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
18 static int regmap_spi_write(struct device *dev, const void *data, size_t count)
20 struct spi_device *spi = to_spi_device(dev);
22 return spi_write(spi, data, count);
25 static int regmap_spi_gather_write(struct device *dev,
26 const void *reg, size_t reg_len,
27 const void *val, size_t val_len)
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, }, };
34 spi_message_init(&m);
35 spi_message_add_tail(&t[0], &m);
36 spi_message_add_tail(&t[1], &m);
38 return spi_sync(spi, &m);
41 static int regmap_spi_read(struct device *dev,
42 const void *reg, size_t reg_size,
43 void *val, size_t val_size)
45 struct spi_device *spi = to_spi_device(dev);
47 return spi_write_then_read(spi, reg, reg_size, val, val_size);
50 static struct regmap_bus regmap_spi = {
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,
58 /**
59 * regmap_init_spi(): Initialise register map
61 * @spi: Device that will be interacted with
62 * @config: Configuration for register map
64 * The return value will be an ERR_PTR() on error or a valid pointer to
65 * a struct regmap.
67 struct regmap *regmap_init_spi(struct spi_device *spi,
68 const struct regmap_config *config)
70 return regmap_init(&spi->dev, &regmap_spi, config);
72 EXPORT_SYMBOL_GPL(regmap_init_spi);
74 MODULE_LICENSE("GPL");