In progress changes for OLED display work

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2669 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 36 insertions, 1 deletions

diff --git a/nuttx/configs/olimex-strp711/src/up_spi.c b/nuttx/configs/olimex-strp711/src/up_spi.c
index c01cbbc87..5ca35b72e 100644
--- a/nuttx/configs/olimex-strp711/src/up_spi.c
+++ b/nuttx/configs/olimex-strp711/src/up_spi.c
@@ -390,6 +390,9 @@ static inline void spi_drain(FAR struct str71x_spidev_s *priv);
 
 /* SPI methods */
 
+#ifndef CONFIG_SPI_OWNBUS
+static int    spi_lock(FAR struct spi_dev_s *dev, bool lock);
+#endif
 static void   spi_select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected);
 static uint32_t spi_setfrequency(FAR struct spi_dev_s *dev, uint32_t frequency);
 static uint8_t  spi_status(FAR struct spi_dev_s *dev, enum spi_dev_e devid);
@@ -403,7 +406,9 @@ static void   spi_recvblock(FAR struct spi_dev_s *dev, FAR void *buffer, size_t
 
 static const struct spi_ops_s g_spiops =
 {
-  .lock              = 0,                 /* Not yet implemented */
+#ifndef CONFIG_SPI_OWNBUS
+  .lock              = spi_lock,
+#endif
   .select            = spi_select,
   .setfrequency      = spi_setfrequency,
   .status            = spi_status,
@@ -527,6 +532,36 @@ static inline void spi_drain(FAR struct str71x_spidev_s *priv)
 }
 
 /****************************************************************************
+ * Name: spi_lock
+ *
+ * Description:
+ *   On SPI busses where there are multiple devices, it will be necessary to
+ *   lock SPI to have exclusive access to the busses for a sequence of
+ *   transfers.  The bus should be locked before the chip is selected. After
+ *   locking the SPI bus, the caller should then also call the setfrequency,
+ *   setbits, and setmode methods to make sure that the SPI is properly
+ *   configured for the device.  If the SPI buss is being shared, then it
+ *   may have been left in an incompatible state.
+ *
+ * Input Parameters:
+ *   dev  - Device-specific state data
+ *   lock - true: Lock spi bus, false: unlock SPI bus
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_SPI_OWNBUS
+static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
+{
+  /* Not implemented */
+
+  return -ENOSYS;
+}
+#endif
+
+/****************************************************************************
  * Name: spi_select
  *
  * Description: