From ba3864f8037f58dd1f46cad3b76adc0a84bd33b3 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 20 Apr 2015 12:37:14 -0600 Subject: [PATCH] dm: i2c: Add functions to read and write a register 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 Acked-by: Heiko Schocher --- 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 f2e95c0881..b8eb2d613f 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 6fd73fae4c..d794057f4b 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -123,6 +123,27 @@ int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer, 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 * -- 2.25.1