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regmap: spi: Support asynchronous I/O for SPI

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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-01-29 12:14:12 +08:00
parent 0d509f2b11
commit e0356dfe98
1 changed files with 52 additions and 0 deletions
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52
drivers/base/regmap/regmap-spi.c
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@ -15,6 +15,21 @@
#include <linux/init.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;
@ -40,6 +55,41 @@ static int regmap_spi_gather_write(void *context,
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);
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);
return &async_spi->core;
}
static int regmap_spi_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
@ -53,6 +103,8 @@ static int regmap_spi_read(void *context,
static 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,
};