Adapter drivers might support only a subset of the SMBus operations
natively. Those drivers currently have to manually emulate unsupported
operations using I2C.
Make the i2c_smbus_xfer() function fall back to
i2c_smbus_xfer_emulated() when the adapter's .smbus_xfer() operation
returns -EOPNOTSUPP, like it already does when the .smbus_xfer()
operation isn't available at all.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 8cfa660..16e750e 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -2113,8 +2113,8 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
union i2c_smbus_data *data)
{
unsigned long orig_jiffies;
+ s32 res = -EOPNOTSUPP;
int try;
- s32 res;
flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
@@ -2134,7 +2134,12 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
break;
}
i2c_unlock_adapter(adapter);
- } else
+ }
+
+ /* Fall back to i2c_smbus_xfer_emulated of the adapter doesn't implement
+ * native support for the SMBus operation.
+ */
+ if (res == -EOPNOTSUPP && adapter->algo->master_xfer)
res = i2c_smbus_xfer_emulated(adapter, addr, flags, read_write,
command, protocol, data);
--
1.7.3.4
--
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