[U-Boot] [PATCH v4 10/34] w1: add command for onewire protocol

Eugen Hristev
2018-09-18T07:35:33Z

Add basic command for bus information and read for onewire
bus using Dallas 1-Wire protocol.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
cmd/Kconfig | 7 ++++
cmd/Makefile | 1 +
cmd/w1.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 cmd/w1.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 13d4c99..b0d6e1b 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -832,6 +832,13 @@ config CMD_I2C
help
I2C support.

+config CMD_W1
+ depends on W1
+ default y if W1
+ bool "w1 - Support for Dallas 1-Wire protocol"
+ help
+ Dallas 1-wire protocol support
+
config CMD_LOADB
bool "loadb"
default y
diff --git a/cmd/Makefile b/cmd/Makefile
index 3487c80..b5241b8 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -145,6 +145,7 @@ obj-$(CONFIG_CMD_THOR_DOWNLOAD) += thordown.o
obj-$(CONFIG_CMD_XIMG) += ximg.o
obj-$(CONFIG_CMD_YAFFS2) += yaffs2.o
obj-$(CONFIG_CMD_SPL) += spl.o
+obj-$(CONFIG_CMD_W1) += w1.o
obj-$(CONFIG_CMD_ZIP) += zip.o
obj-$(CONFIG_CMD_ZFS) += zfs.o

diff --git a/cmd/w1.c b/cmd/w1.c
new file mode 100644
index 0000000..9c95fcf
--- /dev/null
+++ b/cmd/w1.c
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * (C) Copyright 2018
+ * Microchip Technology, Inc.
+ * Eugen Hristev <eugen.hristev@microchip.com>
+ */
+#include <common.h>
+#include <command.h>
+#include <w1.h>
+#include <w1-eeprom.h>
+#include <dm/device-internal.h>
+
+static int w1_bus(void)
+{
+ struct udevice *bus, *dev;
+ int ret;
+
+ ret = w1_get_bus(0, &bus);
+ if (ret) {
+ printf("one wire interface not found\n");
+ return CMD_RET_FAILURE;
+ }
+ printf("Bus %d:\t%s", bus->seq, bus->name);
+ if (device_active(bus))
+ printf(" (active)");
+ printf("\n");
+
+ for (device_find_first_child(bus, &dev);
+ dev;
+ device_find_next_child(&dev)) {
+ ret = device_probe(dev);
+
+ printf("\t%s (%d) uclass %s : ", dev->name, dev->seq,
+ dev->uclass->uc_drv->name);
+
+ if (ret)
+ printf("device error\n");
+ else
+ printf("family 0x%x\n", w1_get_device_family(dev));
+ }
+ return CMD_RET_SUCCESS;
+}
+
+static int w1_read(int argc, char *const argv[])
+{
+ int bus_n = 0, dev_n = 0, offset = 0, len = 512;
+ int i;
+ struct udevice *bus, *dev;
+ int ret;
+ u8 buf[512];
+
+ if (argc > 2)
+ bus_n = simple_strtoul(argv[2], NULL, 10);
+
+ if (argc > 3)
+ dev_n = simple_strtoul(argv[3], NULL, 10);
+
+ if (argc > 4)
+ offset = simple_strtoul(argv[4], NULL, 10);
+
+ if (argc > 5)
+ len = simple_strtoul(argv[5], NULL, 10);
+
+ if (len > 512) {
+ printf("len needs to be <= 512\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = w1_get_bus(bus_n, &bus);
+ if (ret) {
+ printf("one wire interface not found\n");
+ return CMD_RET_FAILURE;
+ }
+
+ for (device_find_first_child(bus, &dev), i = 0;
+ dev && i <= dev_n;
+ device_find_next_child(&dev), i++) {
+ ret = device_probe(dev);
+ if (!ret && i == dev_n)
+ break;
+ }
+
+ if (i != dev_n || ret || !dev) {
+ printf("invalid dev\n");
+ return CMD_RET_FAILURE;
+ }
+
+ if (strcmp(dev->uclass->uc_drv->name, "w1_eeprom")) {
+ printf("the device present on the interface is of unknown device class\n");
+ return CMD_RET_FAILURE;
+ }
+
+ ret = w1_eeprom_read_buf(dev, offset, (u8 *)buf, len);
+ if (ret) {
+ printf("error reading device %s\n", dev->name);
+ return CMD_RET_FAILURE;
+ }
+
+ for (i = 0; i < len; i++)
+ printf("%x", buf[i]);
+ printf("\n");
+
+ return CMD_RET_SUCCESS;
+}
+
+int do_w1(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ if (argc < 2)
+ return CMD_RET_USAGE;
+
+ if (!strcmp(argv[1], "bus"))
+ return w1_bus();
+
+ if (!strcmp(argv[1], "read"))
+ return w1_read(argc, argv);
+
+ return CMD_RET_SUCCESS;
+}
+
+U_BOOT_CMD(w1, 6, 0, do_w1,
+ "onewire interface utility commands",
+ "bus - show onewire bus info (all)\n"
+ "w1 read [<bus> [<dev> [offset [length]]]]"
+ " - read from onewire device 'dev' on onewire bus 'bus'"
+ " starting from offset 'offset' and length 'length'\n"
+ " defaults: bus 0, dev 0, offset 0, length 512 bytes.");
--
2.7.4