forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
3.3 KiB
132 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// |
|
// Register map access API - SPI support |
|
// |
|
// Copyright 2011 Wolfson Microelectronics plc |
|
// |
|
// Author: Mark Brown <[email protected]> |
|
|
|
#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, |
|
}; |
|
|
|
struct regmap *__regmap_init_spi(struct spi_device *spi, |
|
const struct regmap_config *config, |
|
struct lock_class_key *lock_key, |
|
const char *lock_name) |
|
{ |
|
return __regmap_init(&spi->dev, ®map_spi, &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) |
|
{ |
|
return __devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config, |
|
lock_key, lock_name); |
|
} |
|
EXPORT_SYMBOL_GPL(__devm_regmap_init_spi); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|