Add a sandbox driver for a one wire EEPROM memory
Signed-off-by: Eugen Hristev eugen.hristev@microchip.com --- drivers/w1-eeprom/Kconfig | 6 ++++ drivers/w1-eeprom/Makefile | 1 + drivers/w1-eeprom/eep_sandbox.c | 61 +++++++++++++++++++++++++++++++++++++++++ include/w1.h | 1 + 4 files changed, 69 insertions(+) create mode 100644 drivers/w1-eeprom/eep_sandbox.c
diff --git a/drivers/w1-eeprom/Kconfig b/drivers/w1-eeprom/Kconfig index 20ec549..4b7f3c4 100644 --- a/drivers/w1-eeprom/Kconfig +++ b/drivers/w1-eeprom/Kconfig @@ -18,6 +18,12 @@ config W1_EEPROM_DS24XXX help Maxim DS24 EEPROMs 1-Wire EEPROM support
+config W1_EEPROM_SANDBOX + bool "Enable sandbox onewire EEPROM driver" + depends on W1 + help + Sandbox driver for a onewire EEPROM memory + endif
endmenu diff --git a/drivers/w1-eeprom/Makefile b/drivers/w1-eeprom/Makefile index 3f4aa13..03cc4c8 100644 --- a/drivers/w1-eeprom/Makefile +++ b/drivers/w1-eeprom/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
obj-$(CONFIG_W1_EEPROM_DS24XXX) += ds24xxx.o
+obj-$(CONFIG_W1_EEPROM_SANDBOX) += eep_sandbox.o diff --git a/drivers/w1-eeprom/eep_sandbox.c b/drivers/w1-eeprom/eep_sandbox.c new file mode 100644 index 0000000..27c7f9f --- /dev/null +++ b/drivers/w1-eeprom/eep_sandbox.c @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0+ + * + * Copyright (c) 2018 Microchip Technology, Inc. + * + */ + +#include <common.h> +#include <linux/err.h> +#include <dm.h> +#include <w1-eeprom.h> +#include <w1.h> + +#define W1_F2D_READ_EEPROM 0xf0 + +#define EEP_SANDBOX_SAMPLE_MEM "this is a sample EEPROM memory string." + +static int eep_sandbox_read_buf(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count) +{ + /* do not allow to copy more than our maximum sample string */ + if (offset + count < strlen(EEP_SANDBOX_SAMPLE_MEM)) { + offset = 0; + count = strlen(EEP_SANDBOX_SAMPLE_MEM); + } + strncpy((char *)buf, EEP_SANDBOX_SAMPLE_MEM, count); + + /* + * in case the w1 subsystem uses some different kind of sandbox testing, + * like randomized gpio values , we take the buffer from there + */ + + w1_reset_select(dev); + + w1_write_byte(dev, W1_F2D_READ_EEPROM); + w1_write_byte(dev, offset & 0xff); + w1_write_byte(dev, offset >> 8); + + w1_read_buf(dev, buf, count); + + /* + * even if read buf from w1 fails, return success as we hardcoded + * the buffer. + */ + return 0; +} + +static const struct w1_eeprom_ops eep_sandbox_ops = { + .read_buf = eep_sandbox_read_buf, +}; + +static const struct udevice_id eep_sandbox_id[] = { + { .compatible = "sandbox,w1-eeprom", .data = W1_FAMILY_EEP_SANDBOX }, + { }, +}; + +U_BOOT_DRIVER(eep_sandbox) = { + .name = "eep_sandbox", + .id = UCLASS_W1_EEPROM, + .of_match = eep_sandbox_id, + .ops = &eep_sandbox_ops, +}; diff --git a/include/w1.h b/include/w1.h index b36e0f8..399177a 100644 --- a/include/w1.h +++ b/include/w1.h @@ -12,6 +12,7 @@
#define W1_FAMILY_DS24B33 0x23 #define W1_FAMILY_DS2431 0x2d +#define W1_FAMILY_EEP_SANDBOX 0xfe
struct w1_device { u64 id;