diff options
| author | Simon Glass <sjg@chromium.org> | 2015-07-02 18:15:42 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 20:57:51 -0600 |
| commit | df358c6beca8f7cc2f2b67c54f0bf255ebd5cc22 (patch) | |
| tree | 702662e59c25602e3c8820742ce85c9506d410ba | |
| parent | 7fc65bcf8a0a5463db86efbb273a40448c845efc (diff) | |
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 <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
| -rw-r--r-- | drivers/i2c/i2c-uclass.c | 11 | ||||
| -rw-r--r-- | include/i2c.h | 13 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c index 42d6e89e9dd..50b99ead3d9 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 4c0e263b933..d19182931c5 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 |