Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[karo-tx-linux.git] / drivers / i2c / i2c-core.c

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 80ae12048e858a4bd80bfd66deaddf7d7351ef49..42e852d79ffaa5b001dda2c44219cad064a537e7 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1687,6 +1687,28 @@ s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
 }
 EXPORT_SYMBOL(i2c_smbus_write_word_data);
 
+/**
+ * i2c_smbus_process_call - SMBus "process call" protocol
+ * @client: Handle to slave device
+ * @command: Byte interpreted by slave
+ * @value: 16-bit "word" being written
+ *
+ * This executes the SMBus "process call" protocol, returning negative errno
+ * else a 16-bit unsigned "word" received from the device.
+ */
+s32 i2c_smbus_process_call(struct i2c_client *client, u8 command, u16 value)
+{
+       union i2c_smbus_data data;
+       int status;
+       data.word = value;
+
+       status = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+                               I2C_SMBUS_WRITE, command,
+                               I2C_SMBUS_PROC_CALL, &data);
+       return (status < 0) ? status : data.word;
+}
+EXPORT_SYMBOL(i2c_smbus_process_call);
+
 /**
  * i2c_smbus_read_block_data - SMBus "block read" protocol
  * @client: Handle to slave device