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.");