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Message-ID: <20081002014201.GD26575@xi.wantstofly.org>
Date: Thu, 2 Oct 2008 03:42:01 +0200
From: Lennert Buytenhek <buytenh@...tstofly.org>
To: netdev@...r.kernel.org, Andy Fleming <afleming@...escale.com>
Cc: Byron Bradley <byron.bbradley@...il.com>,
Tim Ellis <tim.ellis@....com>, Imre Kaloz <kaloz@...nwrt.org>,
Nicolas Pitre <nico@....org>, Dirk Teurlings <dirk@...xia.nl>,
Peter van Valderen <p.v.valderen@...il.com>
Subject: [PATCHv2 3/3] phylib: give mdio buses a device tree presence
Introduce the mdio_bus class, and give each 'struct mii_bus' its own
'struct device', so that mii_bus objects are represented in the device
tree and can be found by querying the device tree.
Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>
---
drivers/net/phy/mdio_bus.c | 75 +++++++++++++++++++++++++++++++++++++++++--
include/linux/phy.h | 8 +++++
2 files changed, 79 insertions(+), 4 deletions(-)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index e889a06..6671e2d 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -43,11 +43,35 @@
*/
struct mii_bus *mdiobus_alloc(void)
{
- return kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
+ struct mii_bus *bus;
+
+ bus = kzalloc(sizeof(*bus), GFP_KERNEL);
+ if (bus != NULL)
+ bus->state = MDIOBUS_ALLOCATED;
+
+ return bus;
}
EXPORT_SYMBOL(mdiobus_alloc);
/**
+ * mdiobus_release - mii_bus device release callback
+ *
+ * Description: called when the last reference to an mii_bus is
+ * dropped, to free the underlying memory.
+ */
+static void mdiobus_release(struct device *d)
+{
+ struct mii_bus *bus = to_mii_bus(d);
+ BUG_ON(bus->state != MDIOBUS_RELEASED);
+ kfree(bus);
+}
+
+static struct class mdio_bus_class = {
+ .name = "mdio_bus",
+ .dev_release = mdiobus_release,
+};
+
+/**
* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
* @bus: target mii_bus
*
@@ -66,6 +90,22 @@ int mdiobus_register(struct mii_bus *bus)
NULL == bus->write)
return -EINVAL;
+ BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
+ bus->state != MDIOBUS_UNREGISTERED);
+
+ bus->dev.parent = bus->parent;
+ bus->dev.class = &mdio_bus_class;
+ bus->dev.groups = NULL;
+ memcpy(bus->dev.bus_id, bus->id, MII_BUS_ID_SIZE);
+
+ err = device_register(&bus->dev);
+ if (err) {
+ printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
+ return -EINVAL;
+ }
+
+ bus->state = MDIOBUS_REGISTERED;
+
mutex_init(&bus->mdio_lock);
if (bus->reset)
@@ -92,6 +132,10 @@ void mdiobus_unregister(struct mii_bus *bus)
{
int i;
+ BUG_ON(bus->state != MDIOBUS_REGISTERED);
+ bus->state = MDIOBUS_UNREGISTERED;
+
+ device_unregister(&bus->dev);
for (i = 0; i < PHY_MAX_ADDR; i++) {
if (bus->phy_map[i])
device_unregister(&bus->phy_map[i]->dev);
@@ -103,11 +147,24 @@ EXPORT_SYMBOL(mdiobus_unregister);
* mdiobus_free - free a struct mii_bus
* @bus: mii_bus to free
*
- * This function frees the mii_bus.
+ * This function releases the reference to the underlying device
+ * object in the mii_bus. If this is the last reference, the mii_bus
+ * will be freed.
*/
void mdiobus_free(struct mii_bus *bus)
{
- kfree(bus);
+ /*
+ * For compatibility with error handling in drivers.
+ */
+ if (bus->state == MDIOBUS_ALLOCATED) {
+ kfree(bus);
+ return;
+ }
+
+ BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
+ bus->state = MDIOBUS_RELEASED;
+
+ put_device(&bus->dev);
}
EXPORT_SYMBOL(mdiobus_free);
@@ -254,10 +311,20 @@ EXPORT_SYMBOL(mdio_bus_type);
int __init mdio_bus_init(void)
{
- return bus_register(&mdio_bus_type);
+ int ret;
+
+ ret = class_register(&mdio_bus_class);
+ if (!ret) {
+ ret = bus_register(&mdio_bus_type);
+ if (ret)
+ class_unregister(&mdio_bus_class);
+ }
+
+ return ret;
}
void mdio_bus_exit(void)
{
+ class_unregister(&mdio_bus_class);
bus_unregister(&mdio_bus_type);
}
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e6c46c8..77c4ed6 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -100,6 +100,13 @@ struct mii_bus {
struct mutex mdio_lock;
struct device *parent;
+ enum {
+ MDIOBUS_ALLOCATED = 1,
+ MDIOBUS_REGISTERED,
+ MDIOBUS_UNREGISTERED,
+ MDIOBUS_RELEASED,
+ } state;
+ struct device dev;
/* list of all PHYs on bus */
struct phy_device *phy_map[PHY_MAX_ADDR];
@@ -113,6 +120,7 @@ struct mii_bus {
*/
int *irq;
};
+#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
struct mii_bus *mdiobus_alloc(void);
int mdiobus_register(struct mii_bus *bus);
--
1.5.6.4
--
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