forked from Minki/linux
f231ff38b7
Set regmap raw read/write from spi max_transfer_size so regmap_raw_read/write can split the access into chunks Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com> [André: fix build warning] Signed-off-by: André Almeida <andrealmeid@collabora.com> Link: https://lore.kernel.org/r/20211021132721.13669-1-andrealmeid@collabora.com Signed-off-by: Mark Brown <broonie@kernel.org>
161 lines
3.9 KiB
C
161 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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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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#include <linux/regmap.h>
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#include <linux/spi/spi.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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if (val)
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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 const 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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.reg_format_endian_default = REGMAP_ENDIAN_BIG,
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.val_format_endian_default = REGMAP_ENDIAN_BIG,
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};
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static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
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const struct regmap_config *config)
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{
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size_t max_size = spi_max_transfer_size(spi);
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struct regmap_bus *bus;
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if (max_size != SIZE_MAX) {
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bus = kmemdup(®map_spi, sizeof(*bus), GFP_KERNEL);
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if (!bus)
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return ERR_PTR(-ENOMEM);
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bus->free_on_exit = true;
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bus->max_raw_read = max_size;
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bus->max_raw_write = max_size;
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return bus;
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}
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return ®map_spi;
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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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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_spi);
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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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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
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if (IS_ERR(bus))
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return ERR_CAST(bus);
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return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
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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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