From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Sang Subject: [PATCH 03/10] i2c: apply address offset for slaves, too Date: Sat, 8 Aug 2015 22:33:20 +0200 Message-ID: <1439066007-13951-4-git-send-email-wsa@the-dreams.de> References: <1439066007-13951-1-git-send-email-wsa@the-dreams.de> Return-path: In-Reply-To: <1439066007-13951-1-git-send-email-wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Magnus Damm , Simon Horman , Laurent Pinchart , Geert Uytterhoeven , Wolfram Sang , Andrey Danin , Stephen Warren , Stephen Warren List-Id: linux-i2c@vger.kernel.org From: Wolfram Sang 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 Acked-by: Stephen Warren Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index e6d4935161e490..150ee00b5ff5cb 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -57,6 +57,9 @@ #define CREATE_TRACE_POINTS #include +#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 */ @@ -776,6 +779,21 @@ 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) @@ -921,10 +939,8 @@ 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