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- /* 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 <dm.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", dev_seq(bus), 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),
- 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 = dectoul(argv[2], NULL);
- if (argc > 3)
- dev_n = dectoul(argv[3], NULL);
- if (argc > 4)
- offset = dectoul(argv[4], NULL);
- if (argc > 5)
- len = dectoul(argv[5], NULL);
- 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(struct cmd_tbl *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.");
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