From: Maxime Ripard <maxime.rip...@free-electrons.com>
We might want to access data stored onto one wire EEPROMs.
Create a framework to provide a consistent API.
Signed-off-by: Maxime Ripard <maxime.rip...@bootlin.com>
[eugen.hris...@microchip.com: reworked patch]
Signed-off-by: Eugen Hristev <eugen.hris...@microchip.com>
---
drivers/Kconfig | 2 ++
drivers/Makefile | 1 +
drivers/w1-eeprom/Kconfig | 17 +++++++++++
drivers/w1-eeprom/Makefile | 2 ++
drivers/w1-eeprom/w1-eeprom-uclass.c | 56 ++++++++++++++++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/w1-eeprom.h | 28 ++++++++++++++++++
7 files changed, 107 insertions(+)
create mode 040000 drivers/w1-eeprom
create mode 100644 drivers/w1-eeprom/Kconfig
create mode 100644 drivers/w1-eeprom/Makefile
create mode 100644 drivers/w1-eeprom/w1-eeprom-uclass.c
create mode 100644 include/w1-eeprom.h
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 2cae829..386af75 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -104,6 +104,8 @@ source "drivers/video/Kconfig"
source "drivers/w1/Kconfig"
+source "drivers/w1-eeprom/Kconfig"
+
source "drivers/watchdog/Kconfig"
config PHYS_TO_BUS
diff --git a/drivers/Makefile b/drivers/Makefile
index 728380b..de67a17 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -102,6 +102,7 @@ obj-y += soc/
obj-$(CONFIG_REMOTEPROC) += remoteproc/
obj-y += thermal/
obj-$(CONFIG_W1) += w1/
+obj-$(CONFIG_W1_EEPROM) += w1-eeprom/
obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
endif
diff --git a/drivers/w1-eeprom/Kconfig b/drivers/w1-eeprom/Kconfig
new file mode 100644
index 0000000..d5ddc80
--- /dev/null
+++ b/drivers/w1-eeprom/Kconfig
@@ -0,0 +1,17 @@
+#
+# EEPROM subsystem configuration
+#
+
+menu "1-wire EEPROM support"
+
+config W1_EEPROM
+ bool "Enable support for EEPROMs on 1wire interface"
+ depends on DM
+ help
+ Support for the EEPROMs connected on 1-wire Dallas protocol interface
+
+if W1_EEPROM
+
+endif
+
+endmenu
diff --git a/drivers/w1-eeprom/Makefile b/drivers/w1-eeprom/Makefile
new file mode 100644
index 0000000..b72950e
--- /dev/null
+++ b/drivers/w1-eeprom/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o
+
diff --git a/drivers/w1-eeprom/w1-eeprom-uclass.c
b/drivers/w1-eeprom/w1-eeprom-uclass.c
new file mode 100644
index 0000000..4176baf
--- /dev/null
+++ b/drivers/w1-eeprom/w1-eeprom-uclass.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Copyright (c) 2015 Free Electrons
+ * Copyright (c) 2015 NextThing Co.
+ *
+ * Maxime Ripard <maxime.rip...@free-electrons.com>
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <w1-eeprom.h>
+
+#include <dm/device-internal.h>
+
+int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
+ u8 *buf, unsigned int count)
+{
+ const struct w1_eeprom_ops *ops = device_get_ops(dev);
+
+ if (!ops->read_buf)
+ return -ENOSYS;
+
+ return ops->read_buf(dev, offset, buf, count);
+}
+
+UCLASS_DRIVER(w1_eeprom) = {
+ .name = "w1_eeprom",
+ .id = UCLASS_W1_EEPROM,
+};
+
+int w1_eeprom_dm_init(void)
+{
+ struct udevice *bus;
+ struct uclass *uc;
+ int ret;
+
+ ret = uclass_get(UCLASS_W1_EEPROM, &uc);
+ if (ret)
+ return ret;
+
+ uclass_foreach_dev(bus, uc) {
+ ret = device_probe(bus);
+ if (ret == -ENODEV) { /* No such device. */
+ debug("W1_EEPROM not available.\n");
+ continue;
+ }
+
+ if (ret) { /* Other error. */
+ printf("W1_EEPROM probe failed, error %d\n", ret);
+ continue;
+ }
+ }
+
+ return 0;
+}
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 8eca9dc..06ff339 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -90,6 +90,7 @@ enum uclass_id {
UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */
UCLASS_VIDEO_CONSOLE, /* Text console driver for video device */
UCLASS_W1, /* Dallas 1-Wire bus */
+ UCLASS_W1_EEPROM, /* one-wire EEPROMs */
UCLASS_WDT, /* Watchdot Timer driver */
UCLASS_COUNT,
diff --git a/include/w1-eeprom.h b/include/w1-eeprom.h
new file mode 100644
index 0000000..7c9dd96
--- /dev/null
+++ b/include/w1-eeprom.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Copyright (c) 2015 Free Electrons
+ * Copyright (c) 2015 NextThing Co
+ * Copyright (c) 2018 Microchip Technology, Inc.
+ *
+ */
+
+#ifndef __W1_EEPROM_H
+#define __W1_EEPROM_H
+
+struct udevice;
+
+struct w1_eeprom_ops {
+ /*
+ * Reads a buff from the given EEPROM memory, starting at
+ * given offset and place the results into the given buffer.
+ * Should read given count of bytes.
+ * Should return 0 on success, and normal error.h on error
+ */
+ int (*read_buf)(struct udevice *dev, unsigned int offset,
+ u8 *buf, unsigned int count);
+};
+
+int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
+ u8 *buf, unsigned int count);
+
+#endif
--
2.7.4
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