From 38f250cde3889dbc50f4f3f931876d67a340a8c3 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 4 Mar 2015 06:52:46 -0600
Subject: [PATCH] Add missing SPI callback functions to the STM32 SPI driver. 
 From Freddie Chopin

---
 arch/arm/src/stm32/stm32_spi.c | 36 +++++++++++++++++++----
 arch/arm/src/stm32/stm32_spi.h | 52 ++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 6 deletions(-)

diff --git a/arch/arm/src/stm32/stm32_spi.c b/arch/arm/src/stm32/stm32_spi.c
index 6cbdff6ec9..8ba8692405 100644
--- a/arch/arm/src/stm32/stm32_spi.c
+++ b/arch/arm/src/stm32/stm32_spi.c
@@ -285,7 +285,11 @@ static const struct spi_ops_s g_sp1iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi1register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi1dev =
@@ -324,7 +328,11 @@ static const struct spi_ops_s g_sp2iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi2register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi2dev =
@@ -363,7 +371,11 @@ static const struct spi_ops_s g_sp3iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi3register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi3dev =
@@ -402,7 +414,11 @@ static const struct spi_ops_s g_sp4iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi4register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi4dev =
@@ -441,7 +457,11 @@ static const struct spi_ops_s g_sp5iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi5register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi5dev =
@@ -480,7 +500,11 @@ static const struct spi_ops_s g_sp6iops =
   .sndblock          = spi_sndblock,
   .recvblock         = spi_recvblock,
 #endif
-  .registercallback  = 0,
+#ifdef CONFIG_SPI_CALLBACK
+  .registercallback  = stm32_spi6register,  /* provided externally */
+#else
+  .registercallback  = 0,  /* not implemented */
+#endif
 };
 
 static struct stm32_spidev_s g_spi6dev =
diff --git a/arch/arm/src/stm32/stm32_spi.h b/arch/arm/src/stm32/stm32_spi.h
index 2ee090958f..ddcc0f083c 100644
--- a/arch/arm/src/stm32/stm32_spi.h
+++ b/arch/arm/src/stm32/stm32_spi.h
@@ -136,6 +136,58 @@ uint8_t stm32_spi6status(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
 int stm32_spi6cmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd);
 #endif
 
+/****************************************************************************
+ * Name: stm32_spi1/2/...register
+ *
+ * Description:
+ *   If the board supports a card detect callback to inform the SPI-based
+ *   MMC/SD drvier when an SD card is inserted or removed, then
+ *   CONFIG_SPI_CALLBACK should be defined and the following function(s) must
+ *   be implemented.  These functiosn implements the registercallback method
+ *   of the SPI interface (see include/nuttx/spi/spi.h for details)
+ *
+ * Input Parameters:
+ *   dev -      Device-specific state data
+ *   callback - The funtion to call on the media change
+ *   arg -      A caller provided value to return with the callback
+ *
+ * Returned Value:
+ *   0 on success; negated errno on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SPI_CALLBACK
+#ifdef CONFIG_STM32_SPI1
+EXTERN int stm32_spi1register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+
+#ifdef CONFIG_STM32_SPI2
+EXTERN int stm32_spi2register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+
+#ifdef CONFIG_STM32_SPI3
+EXTERN int stm32_spi3register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+
+#ifdef CONFIG_STM32_SPI4
+EXTERN int stm32_spi4register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+
+#ifdef CONFIG_STM32_SPI5
+EXTERN int stm32_spi5register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+
+#ifdef CONFIG_STM32_SPI6
+EXTERN int stm32_spi6register(FAR struct spi_dev_s *dev,
+                              spi_mediachange_t callback, void *arg);
+#endif
+#endif
+
 #undef EXTERN
 #if defined(__cplusplus)
 }