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 <s...@chromium.org>
---
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
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