regmap: spi: Support asynchronous I/O for SPI

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c
index ffa46a9..913274b 100644 (file)
--- 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,
 };