4e7e2a2008
* 'for-linus' of git://opensource.wolfsonmicro.com/regmap: (62 commits) mfd: Enable rbtree cache for wm831x devices regmap: Support some block operations on cached devices regmap: Allow caches for devices with no defaults regmap: Ensure rbtree syncs registers set to zero properly regmap: Allow rbtree to cache zero default values regmap: Warn on raw I/O as well as bulk reads that bypass cache regmap: Return a sensible error code if we fail to read the cache regmap: Use bsearch() to search the register defaults regmap: Fix doc comment regmap: Optimize the lookup path to use binary search regmap: Ensure we scream if we enable cache bypass/only at the same time regmap: Implement regcache_cache_bypass helper function regmap: Save/restore the bypass state upon syncing regmap: Lock the sync path, ensure we use the lockless _regmap_write() regmap: Fix apostrophe usage regmap: Make _regmap_write() global regmap: Fix lock used for regcache_cache_only() regmap: Grab the lock in regcache_cache_only() regmap: Modify map->cache_bypass directly regmap: Fix regcache_sync generic implementation ...
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* Register map access API - SPI support
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*
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* Copyright 2011 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <linux/init.h>
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#include <linux/module.h>
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static int regmap_spi_write(struct device *dev, const void *data, size_t count)
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{
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struct spi_device *spi = to_spi_device(dev);
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return spi_write(spi, data, count);
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}
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static int regmap_spi_gather_write(struct device *dev,
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const void *reg, size_t reg_len,
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const void *val, size_t val_len)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_message m;
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struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
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{ .tx_buf = val, .len = val_len, }, };
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spi_message_init(&m);
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spi_message_add_tail(&t[0], &m);
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spi_message_add_tail(&t[1], &m);
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return spi_sync(spi, &m);
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}
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static int regmap_spi_read(struct device *dev,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct spi_device *spi = to_spi_device(dev);
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return spi_write_then_read(spi, reg, reg_size, val, val_size);
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}
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static struct regmap_bus regmap_spi = {
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.write = regmap_spi_write,
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.gather_write = regmap_spi_gather_write,
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.read = regmap_spi_read,
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.read_flag_mask = 0x80,
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};
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/**
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* regmap_init_spi(): Initialise register map
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*
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* @spi: Device that will be interacted with
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* @config: Configuration for register map
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*
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* The return value will be an ERR_PTR() on error or a valid pointer to
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* a struct regmap.
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*/
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struct regmap *regmap_init_spi(struct spi_device *spi,
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const struct regmap_config *config)
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{
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return regmap_init(&spi->dev, ®map_spi, config);
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}
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EXPORT_SYMBOL_GPL(regmap_init_spi);
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MODULE_LICENSE("GPL");
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