From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Mon, 18 May 2015 19:09:12 +0000 (+0200)
Subject: i2c: apply address offset for slaves, too
X-Git-Tag: firefly_0821_release~176^2~1111^2~19
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=da899f55b359225f85e154765baaddb13ec436ca;p=firefly-linux-kernel-4.4.55.git

i2c: apply address offset for slaves, too

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.

Tested-by: Andrey Danin <danindrey@mail.ru>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 07a83f34ed58..47dbe2514741 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -57,6 +57,9 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/i2c.h>
 
+#define I2C_ADDR_OFFSET_TEN_BIT	0xa000
+#define I2C_ADDR_OFFSET_SLAVE	0x1000
+
 /* core_lock protects i2c_adapter_idr, and guarantees
    that device detection, deletion of detected devices, and attach_adapter
    calls are serialized */
@@ -778,6 +781,21 @@ 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 |= I2C_ADDR_OFFSET_TEN_BIT;
+
+	if (client->flags & I2C_CLIENT_SLAVE)
+		addr |= I2C_ADDR_OFFSET_SLAVE;
+
+	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)
@@ -923,10 +941,8 @@ 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));
 }
 
 /**