1 files changed, 61 insertions, 3 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 229a89e84b0f..39d25a8cb1ad 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -24,6 +24,7 @@
    (c) 2013  Wolfram Sang <wsa@the-dreams.de>
    I2C ACPI code Copyright (C) 2014 Intel Corp
    Author: Lan Tianyu <tianyu.lan@intel.com>
+   I2C slave support (c) 2014 by Wolfram Sang <wsa@sang-engineering.com>
  */
 
 #include <linux/module.h>
@@ -261,7 +262,7 @@ acpi_i2c_space_handler(u32 function, acpi_physical_address command,
         struct acpi_resource *ares;
         u32 accessor_type = function >> 16;
         u8 action = function & ACPI_IO_MASK;
-        acpi_status ret = AE_OK;
+        acpi_status ret;
         int status;
 
         ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
@@ -628,6 +629,17 @@ static int i2c_device_probe(struct device *dev)
         if (!client)
                 return 0;
 
+        if (!client->irq && dev->of_node) {
+                int irq = of_irq_get(dev->of_node, 0);
+
+                if (irq == -EPROBE_DEFER)
+                        return irq;
+                if (irq < 0)
+                        irq = 0;
+
+                client->irq = irq;
+        }
+
         driver = to_i2c_driver(dev->driver);
         if (!driver->probe || !driver->id_table)
                 return -ENODEV;
@@ -1401,7 +1413,6 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
                 return ERR_PTR(-EINVAL);
         }
 
-        info.irq = irq_of_parse_and_map(node, 0);
         info.of_node = of_node_get(node);
         info.archdata = &dev_ad;
 
@@ -1415,7 +1426,6 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
                 dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
                         node->full_name);
                 of_node_put(node);
-                irq_dispose_mapping(info.irq);
                 return ERR_PTR(-EINVAL);
         }
         return result;
@@ -2962,6 +2972,54 @@ trace:
 }
 EXPORT_SYMBOL(i2c_smbus_xfer);
 
+int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb)
+{
+        int ret;
+
+        if (!client || !slave_cb)
+                return -EINVAL;
+
+        if (!(client->flags & I2C_CLIENT_TEN)) {
+                /* Enforce stricter address checking */
+                ret = i2c_check_addr_validity(client->addr);
+                if (ret)
+                        return ret;
+        }
+
+        if (!client->adapter->algo->reg_slave)
+                return -EOPNOTSUPP;
+
+        client->slave_cb = slave_cb;
+
+        i2c_lock_adapter(client->adapter);
+        ret = client->adapter->algo->reg_slave(client);
+        i2c_unlock_adapter(client->adapter);
+
+        if (ret)
+                client->slave_cb = NULL;
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(i2c_slave_register);
+
+int i2c_slave_unregister(struct i2c_client *client)
+{
+        int ret;
+
+        if (!client->adapter->algo->unreg_slave)
+                return -EOPNOTSUPP;
+
+        i2c_lock_adapter(client->adapter);
+        ret = client->adapter->algo->unreg_slave(client);
+        i2c_unlock_adapter(client->adapter);
+
+        if (ret == 0)
+                client->slave_cb = NULL;
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(i2c_slave_unregister);
+
 MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
 MODULE_DESCRIPTION("I2C-Bus main module");
 MODULE_LICENSE("GPL");