Add a driver for the Maxim DS2431 1-Wire EEPROM
Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com --- drivers/eeprom/Kconfig | 6 ++++++ drivers/eeprom/Makefile | 1 + drivers/eeprom/ds2431.c | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 45 insertions(+), 0 deletions(-) create mode 100644 drivers/eeprom/ds2431.c
diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig index 8dc597a8d894..98bbd67ba579 100644 --- a/drivers/eeprom/Kconfig +++ b/drivers/eeprom/Kconfig @@ -12,6 +12,12 @@ config EEPROM
if EEPROM
+config EEPROM_DS2431 + bool "Enable Maxim DS2431 EEPROM support" + depends on W1 + help + Maxim DS2431 1-Wire EEPROM support + endif
endmenu diff --git a/drivers/eeprom/Makefile b/drivers/eeprom/Makefile index 147dba5ec4b8..93dae0bf5d6d 100644 --- a/drivers/eeprom/Makefile +++ b/drivers/eeprom/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_EEPROM) += eeprom-uclass.o
+obj-$(CONFIG_EEPROM_DS2431) += ds2431.o diff --git a/drivers/eeprom/ds2431.c b/drivers/eeprom/ds2431.c new file mode 100644 index 000000000000..84c1a126c339 --- /dev/null +++ b/drivers/eeprom/ds2431.c @@ -0,0 +1,38 @@ +/* + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <linux/err.h> +#include <dm.h> +#include <eeprom.h> +#include <w1.h> + +#define W1_F2D_READ_EEPROM 0xf0 + +static int ds2431_read_buf(struct udevice *dev, unsigned offset, + u8 *buf, unsigned count) +{ + w1_reset_select(dev); + + w1_write_byte(dev, W1_F2D_READ_EEPROM); + w1_write_byte(dev, offset & 0xff); + w1_write_byte(dev, offset >> 8); + + return w1_read_buf(dev, buf, count); +} + +static const struct eeprom_ops ds2431_ops = { + .read_buf = ds2431_read_buf, +}; + +U_BOOT_DRIVER(ds2431) = { + .name = "ds2431", + .id = UCLASS_EEPROM, + .ops = &ds2431_ops, +}; + +U_BOOT_W1_DEVICE(ds2431, W1_FAMILY_DS2431);