From df358c6beca8f7cc2f2b67c54f0bf255ebd5cc22 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 2 Jul 2015 18:15:42 -0600 Subject: dm: i2c: Add a function to transfer messages Sometimes it is useful to be able to transfer a raw I2C message. This happens when the chip address needs to be set manually, or when the data to be sent/received is in another buffer. Add a function to provide access to this. Signed-off-by: Simon Glass Acked-by: Heiko Schocher --- include/i2c.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/i2c.h') diff --git a/include/i2c.h b/include/i2c.h index 4c0e263b933..d19182931c5 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -190,6 +190,19 @@ int dm_i2c_reg_read(struct udevice *dev, uint offset); */ int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val); +/** + * dm_i2c_xfer() - Transfer messages over I2C + * + * This transfers a raw message. It is best to use dm_i2c_reg_read/write() + * instead. + * + * @dev: Device to use for transfer + * @msg: List of messages to transfer + * @nmsgs: Number of messages to transfer + * @return 0 on success, -ve on error + */ +int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs); + /** * dm_i2c_set_bus_speed() - set the speed of a bus * -- cgit v1.2.3