From: Wolfram Sang <wsa+rene...@sang-engineering.com>
We want a separate address range for being an I2C slave. Add an offset
of 0x1000, so it can be combined with ten bit addresses as well. Add a
separate function to create the address value, we will need it later in
other places.
Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
---
drivers/i2c/i2c-core.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e6d4935161e490..a807e272e1fc2e 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -776,6 +776,21 @@ struct i2c_client *i2c_verify_client(struct device *dev)
EXPORT_SYMBOL(i2c_verify_client);
+/* Return a unique address which takes the flags of the client into account */
+static unsigned short i2c_encode_flags_to_addr(struct i2c_client *client)
+{
+ unsigned short addr = client->addr;
+
+ /* For some client flags, add an arbitrary offset to avoid collisions */
+ if (client->flags & I2C_CLIENT_TEN)
+ addr |= 0xa000;
+
+ if (client->flags & I2C_CLIENT_SLAVE)
+ addr |= 0x1000;
+
+ return addr;
+}
+
/* This is a permissive address validity check, I2C address map constraints
* are purposely not enforced, except for the general call address. */
static int i2c_check_client_addr_validity(const struct i2c_client *client)
@@ -921,10 +936,8 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
return;
}
- /* For 10-bit clients, add an arbitrary offset to avoid collisions */
dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap),
- client->addr | ((client->flags & I2C_CLIENT_TEN)
- ? 0xa000 : 0));
+ i2c_encode_flags_to_addr(client));
}
/**
--
2.1.4
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