[linux-block.git] / drivers / base / regmap / regmap-spi.c

// SPDX-License-Identifier: GPL-2.0
//
// Register map access API - SPI support
//
// Copyright 2011 Wolfson Microelectronics plc
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/module.h>

#include "internal.h"

struct regmap_async_spi {
	struct regmap_async core;
	struct spi_message m;
	struct spi_transfer t[2];
};

static void regmap_spi_complete(void *data)
{
	struct regmap_async_spi *async = data;

	regmap_async_complete_cb(&async->core, async->m.status);
}

static int regmap_spi_write(void *context, const void *data, size_t count)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	return spi_write(spi, data, count);
}

static int regmap_spi_gather_write(void *context,
				   const void *reg, size_t reg_len,
				   const void *val, size_t val_len)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);
	struct spi_message m;
	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
				     { .tx_buf = val, .len = val_len, }, };

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);

	return spi_sync(spi, &m);
}

static int regmap_spi_async_write(void *context,
				  const void *reg, size_t reg_len,
				  const void *val, size_t val_len,
				  struct regmap_async *a)
{
	struct regmap_async_spi *async = container_of(a,
						      struct regmap_async_spi,
						      core);
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	async->t[0].tx_buf = reg;
	async->t[0].len = reg_len;
	async->t[1].tx_buf = val;
	async->t[1].len = val_len;

	spi_message_init(&async->m);
	spi_message_add_tail(&async->t[0], &async->m);
	if (val)
		spi_message_add_tail(&async->t[1], &async->m);

	async->m.complete = regmap_spi_complete;
	async->m.context = async;

	return spi_async(spi, &async->m);
}

static struct regmap_async *regmap_spi_async_alloc(void)
{
	struct regmap_async_spi *async_spi;

	async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
	if (!async_spi)
		return NULL;

	return &async_spi->core;
}

static int regmap_spi_read(void *context,
			   const void *reg, size_t reg_size,
			   void *val, size_t val_size)
{
	struct device *dev = context;
	struct spi_device *spi = to_spi_device(dev);

	return spi_write_then_read(spi, reg, reg_size, val, val_size);
}

static const struct regmap_bus regmap_spi = {
	.write = regmap_spi_write,
	.gather_write = regmap_spi_gather_write,
	.async_write = regmap_spi_async_write,
	.async_alloc = regmap_spi_async_alloc,
	.read = regmap_spi_read,
	.read_flag_mask = 0x80,
	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
	.val_format_endian_default = REGMAP_ENDIAN_BIG,
};

static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
						   const struct regmap_config *config)
{
	size_t max_size = spi_max_transfer_size(spi);
	size_t max_msg_size, reg_reserve_size;
	struct regmap_bus *bus;

	if (max_size != SIZE_MAX) {
		bus = kmemdup(&regmap_spi, sizeof(*bus), GFP_KERNEL);
		if (!bus)
			return ERR_PTR(-ENOMEM);

		max_msg_size = spi_max_message_size(spi);
		reg_reserve_size = config->reg_bits / BITS_PER_BYTE
				 + config->pad_bits / BITS_PER_BYTE;
		if (max_size + reg_reserve_size > max_msg_size)
			max_size -= reg_reserve_size;

		bus->free_on_exit = true;
		bus->max_raw_read = max_size;
		bus->max_raw_write = max_size;

		return bus;
	}

	return &regmap_spi;
}

struct regmap *__regmap_init_spi(struct spi_device *spi,
				 const struct regmap_config *config,
				 struct lock_class_key *lock_key,
				 const char *lock_name)
{
	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);

	if (IS_ERR(bus))
		return ERR_CAST(bus);

	return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_spi);

struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name)
{
	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);

	if (IS_ERR(bus))
		return ERR_CAST(bus);

	return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);

MODULE_LICENSE("GPL");
Commit	Line	Data
37613fa5 GKH	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// Register map access API - SPI support
	4	//
	5	// Copyright 2011 Wolfson Microelectronics plc
	6	//
	7	// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
a676f083 MB	8
	9	#include <linux/regmap.h>
	10	#include <linux/spi/spi.h>
b5ddbf46	11	#include <linux/module.h>
a676f083	12
e0356dfe MB	13	#include "internal.h"
	14
	15	struct regmap_async_spi {
	16	struct regmap_async core;
	17	struct spi_message m;
	18	struct spi_transfer t[2];
	19	};
	20
	21	static void regmap_spi_complete(void *data)
	22	{
	23	struct regmap_async_spi *async = data;
	24
	25	regmap_async_complete_cb(&async->core, async->m.status);
	26	}
	27
0135bbcc	28	static int regmap_spi_write(void context, const void data, size_t count)
a676f083	29	{
0135bbcc	30	struct device *dev = context;
a676f083 MB	31	struct spi_device *spi = to_spi_device(dev);
	32
	33	return spi_write(spi, data, count);
	34	}
	35
0135bbcc	36	static int regmap_spi_gather_write(void *context,
a676f083 MB	37	const void *reg, size_t reg_len,
	38	const void *val, size_t val_len)
	39	{
0135bbcc	40	struct device *dev = context;
a676f083 MB	41	struct spi_device *spi = to_spi_device(dev);
	42	struct spi_message m;
	43	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
	44	{ .tx_buf = val, .len = val_len, }, };
	45
	46	spi_message_init(&m);
	47	spi_message_add_tail(&t[0], &m);
	48	spi_message_add_tail(&t[1], &m);
	49
	50	return spi_sync(spi, &m);
	51	}
	52
e0356dfe MB	53	static int regmap_spi_async_write(void *context,
	54	const void *reg, size_t reg_len,
	55	const void *val, size_t val_len,
	56	struct regmap_async *a)
	57	{
	58	struct regmap_async_spi *async = container_of(a,
	59	struct regmap_async_spi,
	60	core);
	61	struct device *dev = context;
	62	struct spi_device *spi = to_spi_device(dev);
	63
	64	async->t[0].tx_buf = reg;
	65	async->t[0].len = reg_len;
	66	async->t[1].tx_buf = val;
	67	async->t[1].len = val_len;
	68
	69	spi_message_init(&async->m);
	70	spi_message_add_tail(&async->t[0], &async->m);
cd1b9dd0 MB	71	if (val)
cd1b9dd0 MB	72	spi_message_add_tail(&async->t[1], &async->m);
e0356dfe MB	73
	74	async->m.complete = regmap_spi_complete;
	75	async->m.context = async;
	76
	77	return spi_async(spi, &async->m);
	78	}
	79
	80	static struct regmap_async *regmap_spi_async_alloc(void)
	81	{
	82	struct regmap_async_spi *async_spi;
	83
	84	async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
95601d65 MB	85	if (!async_spi)
95601d65 MB	86	return NULL;
e0356dfe MB	87
	88	return &async_spi->core;
	89	}
	90
0135bbcc	91	static int regmap_spi_read(void *context,
a676f083 MB	92	const void *reg, size_t reg_size,
	93	void *val, size_t val_size)
	94	{
0135bbcc	95	struct device *dev = context;
a676f083 MB	96	struct spi_device *spi = to_spi_device(dev);
	97
	98	return spi_write_then_read(spi, reg, reg_size, val, val_size);
	99	}
	100
9c2e5cb3	101	static const struct regmap_bus regmap_spi = {
a676f083 MB	102	.write = regmap_spi_write,
a676f083 MB	103	.gather_write = regmap_spi_gather_write,
e0356dfe MB	104	.async_write = regmap_spi_async_write,
e0356dfe MB	105	.async_alloc = regmap_spi_async_alloc,
a676f083	106	.read = regmap_spi_read,
a676f083	107	.read_flag_mask = 0x80,
d647c199 XL	108	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
d647c199 XL	109	.val_format_endian_default = REGMAP_ENDIAN_BIG,
a676f083 MB	110	};
a676f083 MB	111
f231ff38 LT	112	static const struct regmap_bus regmap_get_spi_bus(struct spi_device spi,
	113	const struct regmap_config *config)
	114	{
	115	size_t max_size = spi_max_transfer_size(spi);
f5723cfc	116	size_t max_msg_size, reg_reserve_size;
f231ff38 LT	117	struct regmap_bus *bus;
	118
	119	if (max_size != SIZE_MAX) {
	120	bus = kmemdup(&regmap_spi, sizeof(*bus), GFP_KERNEL);
	121	if (!bus)
	122	return ERR_PTR(-ENOMEM);
	123
f5723cfc CC	124	max_msg_size = spi_max_message_size(spi);
	125	reg_reserve_size = config->reg_bits / BITS_PER_BYTE
	126	+ config->pad_bits / BITS_PER_BYTE;
	127	if (max_size + reg_reserve_size > max_msg_size)
	128	max_size -= reg_reserve_size;
	129
f231ff38 LT	130	bus->free_on_exit = true;
	131	bus->max_raw_read = max_size;
	132	bus->max_raw_write = max_size;
f5723cfc	133
f231ff38 LT	134	return bus;
	135	}
	136
	137	return &regmap_spi;
	138	}
	139
3cfe7a74 NB	140	struct regmap __regmap_init_spi(struct spi_device spi,
	141	const struct regmap_config *config,
	142	struct lock_class_key *lock_key,
	143	const char *lock_name)
a676f083	144	{
f231ff38 LT	145	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
	146
	147	if (IS_ERR(bus))
	148	return ERR_CAST(bus);
	149
	150	return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
a676f083	151	}
3cfe7a74	152	EXPORT_SYMBOL_GPL(__regmap_init_spi);
b33f9cbd	153
3cfe7a74 NB	154	struct regmap __devm_regmap_init_spi(struct spi_device spi,
	155	const struct regmap_config *config,
	156	struct lock_class_key *lock_key,
	157	const char *lock_name)
c0eb4676	158	{
f231ff38 LT	159	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
	160
	161	if (IS_ERR(bus))
	162	return ERR_CAST(bus);
	163
	164	return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
c0eb4676	165	}
3cfe7a74	166	EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);
c0eb4676	167
b33f9cbd	168	MODULE_LICENSE("GPL");