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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-01-29 12:14:12 +0800 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-01-29 12:16:21 +0800 |
commit | e0356dfe98f227cd18314bdbcf93a9b464026ce7 (patch) | |
tree | 3def946a94101d00ac85df4e73e4105a83247cd9 /drivers/base/regmap/regmap-spi.c | |
parent | 0d509f2b112b21411712f0bf789b372987967e49 (diff) | |
download | linux-e0356dfe98f227cd18314bdbcf93a9b464026ce7.tar.bz2 |
regmap: spi: Support asynchronous I/O for SPI
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base/regmap/regmap-spi.c')
-rw-r--r-- | drivers/base/regmap/regmap-spi.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c index ffa46a92ad33..913274b5f00a 100644 --- a/drivers/base/regmap/regmap-spi.c +++ b/drivers/base/regmap/regmap-spi.c @@ -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, }; |