phylib: add mdiobus_{read,write}

[pandora-kernel.git] / drivers / net / phy / mdio_bus.c

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index fb4c096..6671e2d 100644 (file)
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -210,6 +210,55 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
 }
 EXPORT_SYMBOL(mdiobus_scan);
 
+/**
+ * mdiobus_read - Convenience function for reading a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to read
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum)
+{
+       int retval;
+
+       BUG_ON(in_interrupt());
+
+       mutex_lock(&bus->mdio_lock);
+       retval = bus->read(bus, addr, regnum);
+       mutex_unlock(&bus->mdio_lock);
+
+       return retval;
+}
+EXPORT_SYMBOL(mdiobus_read);
+
+/**
+ * mdiobus_write - Convenience function for writing a given MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val)
+{
+       int err;
+
+       BUG_ON(in_interrupt());
+
+       mutex_lock(&bus->mdio_lock);
+       err = bus->write(bus, addr, regnum, val);
+       mutex_unlock(&bus->mdio_lock);
+
+       return err;
+}
+EXPORT_SYMBOL(mdiobus_write);
+
 /**
  * mdio_bus_match - determine if given PHY driver supports the given PHY device
  * @dev: target PHY device