w1: add command for onewire protocol

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>

diff --git a/cmd/Kconfig b/cmd/Kconfig
index cf97a0f2be31f5ffb7d1d59c1d52d2127c44bb37..1e4ab6e78d902cfcdb2205efc41f1c7f516cb469 100644 (file)
--- 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 d3815abf26736665f55849b59ad9ea9425b05480..9e311a79c03a17a49899a2b1afb45f2f96bc71e3 100644 (file)
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -146,6 +146,7 @@ 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 (file)
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.");