forked from Minki/linux
148 lines
3.7 KiB
C
148 lines
3.7 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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#include "internal.h"
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struct regmap_async_spi {
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struct regmap_async core;
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struct spi_message m;
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struct spi_transfer t[2];
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};
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static void regmap_spi_complete(void *data)
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{
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struct regmap_async_spi *async = data;
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regmap_async_complete_cb(&async->core, async->m.status);
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}
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static int regmap_spi_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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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(void *context,
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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 device *dev = context;
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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_async_write(void *context,
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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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struct regmap_async *a)
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{
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struct regmap_async_spi *async = container_of(a,
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struct regmap_async_spi,
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core);
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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async->t[0].tx_buf = reg;
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async->t[0].len = reg_len;
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async->t[1].tx_buf = val;
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async->t[1].len = val_len;
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spi_message_init(&async->m);
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spi_message_add_tail(&async->t[0], &async->m);
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spi_message_add_tail(&async->t[1], &async->m);
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async->m.complete = regmap_spi_complete;
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async->m.context = async;
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return spi_async(spi, &async->m);
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}
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static struct regmap_async *regmap_spi_async_alloc(void)
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{
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struct regmap_async_spi *async_spi;
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async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
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if (!async_spi)
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return NULL;
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return &async_spi->core;
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}
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static int regmap_spi_read(void *context,
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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 device *dev = context;
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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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.async_write = regmap_spi_async_write,
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.async_alloc = regmap_spi_async_alloc,
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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, &spi->dev, config);
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}
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EXPORT_SYMBOL_GPL(regmap_init_spi);
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/**
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* devm_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
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* to a struct regmap. The map will be automatically freed by the
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* device management code.
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*/
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struct regmap *devm_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 devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config);
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}
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EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
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MODULE_LICENSE("GPL");
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