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device/i2c_bus: Add routines to read and write multiple bytes

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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 <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67098
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
This commit is contained in:
Werner Zeh
2022-08-26 13:17:52 +02:00
committed by Martin L Roth
parent 74a00b9cec
commit 63f72f0cd0
2 changed files with 84 additions and 0 deletions
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14
src/include/device/i2c_bus.h
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@@ -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_ */