From 63f72f0cd0d01ef6138bfba80b7cd19d57c6602c Mon Sep 17 00:00:00 2001 From: Werner Zeh Date: Fri, 26 Aug 2022 13:17:52 +0200 Subject: device/i2c_bus: Add routines to read and write multiple bytes Some devices require that several bytes are written with a single I2C write command. Extend the i2c_bus interface functions and add both, read and write for more than one byte at a defined byte offset. Change-Id: I0eec2e1d4185170f02b4ab35aa6546dc69569303 Signed-off-by: Werner Zeh Reviewed-on: https://review.coreboot.org/c/coreboot/+/67098 Reviewed-by: Nico Huber Tested-by: build bot (Jenkins) Reviewed-by: Mario Scheithauer --- src/include/device/i2c_bus.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'src/include') diff --git a/src/include/device/i2c_bus.h b/src/include/device/i2c_bus.h index 1a7e777278..4c9b98d14f 100644 --- a/src/include/device/i2c_bus.h +++ b/src/include/device/i2c_bus.h @@ -90,5 +90,19 @@ int i2c_dev_writeb_at(struct device *, uint8_t off, uint8_t val); * value on error. */ int i2c_dev_read_at16(struct device *, uint8_t *buf, size_t len, uint16_t off); +/* + * Sends the 8-bit register offset `off` and reads `len` bytes into `buf`. + * + * Returns the number of bytes read on success, negative `enum cb_err` + * value on error. + */ +int i2c_dev_read_at(struct device *, uint8_t *buf, size_t len, uint8_t off); +/* + * Sends the 8-bit register offset `off` and writes `len` bytes from `buf`. + * + * Returns the number of bytes written on success, negative `enum cb_err` + * value on error. + */ +int i2c_dev_write_at(struct device *, uint8_t *buf, size_t len, uint8_t off); #endif /* _DEVICE_I2C_BUS_H_ */ -- cgit v1.2.3