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authorJeremy Kerr <jk@ozlabs.org>2017-06-07 00:08:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-09 12:52:07 +0300
commit09aecfab93b8f728c5d65d33f26055b7e726df3b (patch)
tree07849ad0a3a42c9a608f00f49c545839e734314e /drivers/fsi/fsi-core.c
parent9e69dd0179c346dfb5d08b8d46d5f5c9c81ab1b7 (diff)
downloadlinux-09aecfab93b8f728c5d65d33f26055b7e726df3b.tar.xz
drivers/fsi: Add fsi master definition
Add a `struct fsi_master` to represent a FSI master controller. FSI master drivers register one of these structs to provide device-specific of the standard operations: read/write/term/break and link control. Includes changes from Edward A. James <eajames@us.ibm.com> & Jeremy Kerr <jk@ozlabs.org>. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Chris Bostic <cbostic@linux.vnet.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fsi/fsi-core.c')
-rw-r--r--drivers/fsi/fsi-core.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 3d55bd547178..ca02913866f5 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -15,8 +15,43 @@
#include <linux/device.h>
#include <linux/fsi.h>
+#include <linux/idr.h>
#include <linux/module.h>
+#include "fsi-master.h"
+
+static DEFINE_IDA(master_ida);
+
+/* FSI master support */
+int fsi_master_register(struct fsi_master *master)
+{
+ int rc;
+
+ if (!master)
+ return -EINVAL;
+
+ master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
+ dev_set_name(&master->dev, "fsi%d", master->idx);
+
+ rc = device_register(&master->dev);
+ if (rc)
+ ida_simple_remove(&master_ida, master->idx);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(fsi_master_register);
+
+void fsi_master_unregister(struct fsi_master *master)
+{
+ if (master->idx >= 0) {
+ ida_simple_remove(&master_ida, master->idx);
+ master->idx = -1;
+ }
+
+ device_unregister(&master->dev);
+}
+EXPORT_SYMBOL_GPL(fsi_master_unregister);
+
/* FSI core & Linux bus type definitions */
static int fsi_bus_match(struct device *dev, struct device_driver *drv)