Eric Lee / smarc-uboot

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cmd/w1.c 2.71 KB
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d05266f7c   Eugen Hristev   w1: add command f... 
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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 <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
  ");
  		return CMD_RET_FAILURE;
  	}
  	printf("Bus %d:\t%s", bus->seq, bus->name);
  	if (device_active(bus))
  		printf("  (active)");
  	printf("
  ");
  
  	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
  ");
  		else
  			printf("family 0x%x
  ", 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
  ");
  		return CMD_RET_FAILURE;
  	}
  
  	ret = w1_get_bus(bus_n, &bus);
  	if (ret) {
  		printf("one wire interface not found
  ");
  		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
  ");
  		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
  ");
  		return CMD_RET_FAILURE;
  	}
  
  	ret = w1_eeprom_read_buf(dev, offset, (u8 *)buf, len);
  	if (ret) {
  		printf("error reading device %s
  ", dev->name);
  		return CMD_RET_FAILURE;
  	}
  
  	for (i = 0; i < len; i++)
  		printf("%x", buf[i]);
  	printf("
  ");
  
  	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)
  "
  	   "w1 read [<bus> [<dev> [offset [length]]]]"
  	   "    - read from onewire device 'dev' on onewire bus 'bus'"
  	   " starting from offset 'offset' and length 'length'
  "
  	   "      defaults: bus 0, dev 0, offset 0, length 512 bytes.");