Mark Brown | a676f08 | 2011-05-12 11:42:10 +0200 | [diff] [blame] | 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> |
Stephen Rothwell | b5ddbf4 | 2011-08-16 09:36:06 +1000 | [diff] [blame] | 16 | #include <linux/module.h> |
Mark Brown | a676f08 | 2011-05-12 11:42:10 +0200 | [diff] [blame] | 17 | |
| 18 | static 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 | |
| 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) |
| 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 | |
| 41 | static 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 | |
| 50 | static struct regmap_bus regmap_spi = { |
Mark Brown | a676f08 | 2011-05-12 11:42:10 +0200 | [diff] [blame] | 51 | .write = regmap_spi_write, |
| 52 | .gather_write = regmap_spi_gather_write, |
| 53 | .read = regmap_spi_read, |
Mark Brown | a676f08 | 2011-05-12 11:42:10 +0200 | [diff] [blame] | 54 | .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 | */ |
| 66 | struct regmap *regmap_init_spi(struct spi_device *spi, |
| 67 | const struct regmap_config *config) |
| 68 | { |
| 69 | return regmap_init(&spi->dev, ®map_spi, config); |
| 70 | } |
| 71 | EXPORT_SYMBOL_GPL(regmap_init_spi); |
Stephen Warren | b33f9cb | 2011-08-11 11:59:10 -0600 | [diff] [blame] | 72 | |
Mark Brown | c0eb467 | 2012-01-30 19:56:52 +0000 | [diff] [blame] | 73 | /** |
| 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 | */ |
| 83 | struct regmap *devm_regmap_init_spi(struct spi_device *spi, |
| 84 | const struct regmap_config *config) |
| 85 | { |
| 86 | return devm_regmap_init(&spi->dev, ®map_spi, config); |
| 87 | } |
| 88 | EXPORT_SYMBOL_GPL(devm_regmap_init_spi); |
| 89 | |
Stephen Warren | b33f9cb | 2011-08-11 11:59:10 -0600 | [diff] [blame] | 90 | MODULE_LICENSE("GPL"); |