svn commit: r298268 - head/sys/dev/spibus

[Ruslan Bukin]

Author: br
Date: Tue Apr 19 14:18:12 2016
New Revision: 298268
URL: https://svnweb.freebsd.org/changeset/base/298268

Log:
  Add optional chip_select/deselect methods. This is required
  when we want to keep CS asserted for multiple transfers.

Modified:
  head/sys/dev/spibus/spibus.c
  head/sys/dev/spibus/spibus_if.m

Modified: head/sys/dev/spibus/spibus.c
==============================================================================
--- head/sys/dev/spibus/spibus.c	Tue Apr 19 13:36:31 2016	(r298267)
+++ head/sys/dev/spibus/spibus.c	Tue Apr 19 14:18:12 2016	(r298268)
@@ -185,9 +185,24 @@ spibus_hinted_child(device_t bus, const 
 static int
 spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd)
 {
+
 	return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd));
 }
 
+static int
+spibus_chip_select_impl(device_t dev, device_t child)
+{
+
+	return (SPIBUS_CHIP_SELECT(device_get_parent(dev), child));
+}
+
+static int
+spibus_chip_deselect_impl(device_t dev, device_t child)
+{
+
+	return (SPIBUS_CHIP_DESELECT(device_get_parent(dev), child));
+}
+
 static device_method_t spibus_methods[] = {
 	/* Device interface */
 	DEVMETHOD(device_probe,		spibus_probe),
@@ -208,6 +223,8 @@ static device_method_t spibus_methods[] 
 
 	/* spibus interface */
 	DEVMETHOD(spibus_transfer,	spibus_transfer_impl),
+	DEVMETHOD(spibus_chip_select,	spibus_chip_select_impl),
+	DEVMETHOD(spibus_chip_deselect,	spibus_chip_deselect_impl),
 
 	DEVMETHOD_END
 };

Modified: head/sys/dev/spibus/spibus_if.m
==============================================================================
--- head/sys/dev/spibus/spibus_if.m	Tue Apr 19 13:36:31 2016	(r298267)
+++ head/sys/dev/spibus/spibus_if.m	Tue Apr 19 14:18:12 2016	(r298268)
@@ -39,3 +39,19 @@ METHOD int transfer {
 	device_t child;
 	struct spi_command *cmd;
 };
+
+#
+# Assert chip select
+#
+METHOD int chip_select {
+	device_t dev;
+	device_t child;
+};
+
+#
+# Deassert chip select
+#
+METHOD int chip_deselect {
+	device_t dev;
+	device_t child;
+};