Hello Simon,
Am 03.07.2015 um 02:15 schrieb Simon Glass:
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
drivers/i2c/i2c-uclass.c | 11 +++++++++++ include/i2c.h | 13 +++++++++++++ 2 files changed, 24 insertions(+)
Acked-by: Heiko Schocher hs@denx.de
bye, Heiko
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