Merge branch 'i2c/for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

[linux-beck.git] / include / linux / i2c-smbus.h

diff --git a/include/linux/i2c-smbus.h b/include/linux/i2c-smbus.h
index 8f1b086ca5bcc962cbd9d509c4235346c46fefbc..c2e3324f946853037d6f2ad90eacfc15781ceab1 100644 (file)
--- a/include/linux/i2c-smbus.h
+++ b/include/linux/i2c-smbus.h
@@ -23,6 +23,8 @@
 #define _LINUX_I2C_SMBUS_H
 
 #include <linux/i2c.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
 
 
 /**
@@ -48,4 +50,31 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter,
                                         struct i2c_smbus_alert_setup *setup);
 int i2c_handle_smbus_alert(struct i2c_client *ara);
 
+/**
+ * smbus_host_notify - internal structure used by the Host Notify mechanism.
+ * @adapter: the I2C adapter associated with this struct
+ * @work: worker used to schedule the IRQ in the slave device
+ * @lock: spinlock to check if a notification is already pending
+ * @pending: flag set when a notification is pending (any new notification will
+ *             be rejected if pending is true)
+ * @payload: the actual payload of the Host Notify event
+ * @addr: the address of the slave device which raised the notification
+ *
+ * This struct needs to be allocated by i2c_setup_smbus_host_notify() and does
+ * not need to be freed. Internally, i2c_setup_smbus_host_notify() uses a
+ * managed resource to clean this up when the adapter get released.
+ */
+struct smbus_host_notify {
+       struct i2c_adapter      *adapter;
+       struct work_struct      work;
+       spinlock_t              lock;
+       bool                    pending;
+       u16                     payload;
+       u8                      addr;
+};
+
+struct smbus_host_notify *i2c_setup_smbus_host_notify(struct i2c_adapter *adap);
+int i2c_handle_smbus_host_notify(struct smbus_host_notify *host_notify,
+                                unsigned short addr, unsigned int data);
+
 #endif /* _LINUX_I2C_SMBUS_H */