From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Glass Date: Thu, 2 Jul 2015 18:15:42 -0600 Subject: [U-Boot] [PATCH 05/55] dm: i2c: Add a function to transfer messages In-Reply-To: <1435882592-487-1-git-send-email-sjg@chromium.org> References: <1435882592-487-1-git-send-email-sjg@chromium.org> Message-ID: <1435882592-487-6-git-send-email-sjg@chromium.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 --- drivers/i2c/i2c-uclass.c | 11 +++++++++++ include/i2c.h | 13 +++++++++++++ 2 files changed, 24 insertions(+) diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c index 42d6e89..50b99ea 100644 --- a/drivers/i2c/i2c-uclass.c +++ b/drivers/i2c/i2c-uclass.c @@ -202,6 +202,17 @@ int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer, } } +int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs) +{ + struct udevice *bus = dev_get_parent(dev); + struct dm_i2c_ops *ops = i2c_get_ops(bus); + + if (!ops->xfer) + return -ENOSYS; + + return ops->xfer(bus, msg, nmsgs); +} + int dm_i2c_reg_read(struct udevice *dev, uint offset) { uint8_t val; diff --git a/include/i2c.h b/include/i2c.h index 4c0e263..d191829 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -191,6 +191,19 @@ 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 * * @bus: Bus to adjust -- 2.4.3.573.g4eafbef