Add driver model versions of the legacy functions to read and write a
single byte register. These are a useful shortcut in many cases.
Signed-off-by: Simon Glass <s...@chromium.org>
---
drivers/i2c/i2c-uclass.c | 19 +++++++++++++++++++
include/i2c.h | 21 +++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
index f2e95c0..b8eb2d6 100644
--- a/drivers/i2c/i2c-uclass.c
+++ b/drivers/i2c/i2c-uclass.c
@@ -186,6 +186,25 @@ int dm_i2c_write(struct udevice *dev, uint offset, const
uint8_t *buffer,
}
}
+int dm_i2c_reg_read(struct udevice *dev, uint offset)
+{
+ uint8_t val;
+ int ret;
+
+ ret = dm_i2c_read(dev, offset, &val, 1);
+ if (ret < 0)
+ return ret;
+
+ return val;
+}
+
+int dm_i2c_reg_write(struct udevice *dev, uint offset, uint value)
+{
+ uint8_t val = value;
+
+ return dm_i2c_write(dev, offset, &val, 1);
+}
+
/**
* i2c_probe_chip() - probe for a chip on a bus
*
diff --git a/include/i2c.h b/include/i2c.h
index 6fd73fa..d794057 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -124,6 +124,27 @@ int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint
chip_flags,
struct udevice **devp);
/**
+ * dm_i2c_reg_read() - Read a value from an I2C register
+ *
+ * This reads a single value from the given address in an I2C chip
+ *
+ * @addr: Address to read from
+ * @return value read, or -ve on error
+ */
+int dm_i2c_reg_read(struct udevice *dev, uint offset);
+
+/**
+ * dm_i2c_reg_write() - Write a value to an I2C register
+ *
+ * This writes a single value to the given address in an I2C chip
+ *
+ * @addr: Address to write to
+ * @val: Value to write (normally a byte)
+ * @return 0 on success, -ve on error
+ */
+int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
+
+/**
* dm_i2c_set_bus_speed() - set the speed of a bus
*
* @bus: Bus to adjust
--
2.2.0.rc0.207.ga3a616c
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