From: Mark Brown <broonie@xxxxxxxxxx>
Help simplify the cleanup code for SPI master drivers by providing a
managed master registration function, ensuring that the master is
automatically unregistered whenever the device is unbound.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
Documentation/driver-model/devres.txt | 3 +++
drivers/spi/spi.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/spi/spi.h | 2 ++
3 files changed, 40 insertions(+)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 3d9c2a7..5bdc8cb 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -303,3 +303,6 @@ PHY
SLAVE DMA ENGINE
devm_acpi_dma_controller_register()
+
+SPI
+ devm_spi_register_master()
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ced0703..3d34045 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1245,6 +1245,41 @@ done:
}
EXPORT_SYMBOL_GPL(spi_register_master);
+static void devm_spi_unregister(struct device *dev, void *res)
+{
+ spi_unregister_master(*(struct spi_master **)res);
+}
+
+/**
+ * dev_spi_register_master - register managed SPI master controller
+ * @dev: device managing SPI master
+ * @master: initialized master, originally from spi_alloc_master()
+ * Context: can sleep
+ *
+ * Register a SPI device as with spi_register_master() which will
+ * automatically be unregister
+ */
+int devm_spi_register_master(struct device *dev, struct spi_master *master)
+{
+ struct spi_master **ptr;
+ int ret;
+
+ ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ret = spi_register_master(master);
+ if (ret != 0) {
+ *ptr = master;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_spi_register_master);
+
static int __unregister(struct device *dev, void *null)
{
spi_unregister_device(to_spi_device(dev));
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 887116d..4d634d6 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -434,6 +434,8 @@ extern struct spi_master *
spi_alloc_master(struct device *host, unsigned size);
extern int spi_register_master(struct spi_master *master);
+extern int devm_spi_register_master(struct device *dev,
+ struct spi_master *master);
extern void spi_unregister_master(struct spi_master *master);
extern struct spi_master *spi_busnum_to_master(u16 busnum);
--
1.8.4.rc3
--
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