cmd/w1.c

   1 /* SPDX-License-Identifier: GPL-2.0+
   2  *
   3  * (C) Copyright 2018
   4  * Microchip Technology, Inc.
   5  * Eugen Hristev <eugen.hristev@microchip.com>
   6  */
   7 #include <common.h>
   8 #include <command.h>
   9 #include <w1.h>
  10 #include <w1-eeprom.h>
  11 #include <dm/device-internal.h>
  12
  13 static int w1_bus(void)
  14 {
  15         struct udevice *bus, *dev;
  16         int ret;
  17
  18         ret = w1_get_bus(0, &bus);
  19         if (ret) {
  20                 printf("one wire interface not found\n");
  21                 return CMD_RET_FAILURE;
  22         }
  23         printf("Bus %d:\t%s", bus->seq, bus->name);
  24         if (device_active(bus))
  25                 printf("  (active)");
  26         printf("\n");
  27
  28         for (device_find_first_child(bus, &dev);
  29              dev;
  30              device_find_next_child(&dev)) {
  31                 ret = device_probe(dev);
  32
  33                 printf("\t%s (%d) uclass %s : ", dev->name, dev->seq,
  34                        dev->uclass->uc_drv->name);
  35
  36                 if (ret)
  37                         printf("device error\n");
  38                 else
  39                         printf("family 0x%x\n", w1_get_device_family(dev));
  40         }
  41         return CMD_RET_SUCCESS;
  42 }
  43
  44 static int w1_read(int argc, char *const argv[])
  45 {
  46         int bus_n = 0, dev_n = 0, offset = 0, len = 512;
  47         int i;
  48         struct udevice *bus, *dev;
  49         int ret;
  50         u8 buf[512];
  51
  52         if (argc > 2)
  53                 bus_n = simple_strtoul(argv[2], NULL, 10);
  54
  55         if (argc > 3)
  56                 dev_n = simple_strtoul(argv[3], NULL, 10);
  57
  58         if (argc > 4)
  59                 offset = simple_strtoul(argv[4], NULL, 10);
  60
  61         if (argc > 5)
  62                 len = simple_strtoul(argv[5], NULL, 10);
  63
  64         if (len > 512) {
  65                 printf("len needs to be <= 512\n");
  66                 return CMD_RET_FAILURE;
  67         }
  68
  69         ret = w1_get_bus(bus_n, &bus);
  70         if (ret) {
  71                 printf("one wire interface not found\n");
  72                 return CMD_RET_FAILURE;
  73         }
  74
  75         for (device_find_first_child(bus, &dev), i = 0;
  76            dev && i <= dev_n;
  77            device_find_next_child(&dev), i++) {
  78                 ret = device_probe(dev);
  79                 if (!ret && i == dev_n)
  80                         break;
  81         }
  82
  83         if (i != dev_n || ret || !dev) {
  84                 printf("invalid dev\n");
  85                 return CMD_RET_FAILURE;
  86         }
  87
  88         if (strcmp(dev->uclass->uc_drv->name, "w1_eeprom")) {
  89                 printf("the device present on the interface is of unknown device class\n");
  90                 return CMD_RET_FAILURE;
  91         }
  92
  93         ret = w1_eeprom_read_buf(dev, offset, (u8 *)buf, len);
  94         if (ret) {
  95                 printf("error reading device %s\n", dev->name);
  96                 return CMD_RET_FAILURE;
  97         }
  98
  99         for (i = 0; i < len; i++)
 100                 printf("%x", buf[i]);
 101         printf("\n");
 102
 103         return CMD_RET_SUCCESS;
 104 }
 105
 106 int do_w1(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 107 {
 108         if (argc < 2)
 109                 return CMD_RET_USAGE;
 110
 111         if (!strcmp(argv[1], "bus"))
 112                 return w1_bus();
 113
 114         if (!strcmp(argv[1], "read"))
 115                 return w1_read(argc, argv);
 116
 117         return CMD_RET_SUCCESS;
 118 }
 119
 120 U_BOOT_CMD(w1, 6, 0, do_w1,
 121            "onewire interface utility commands",
 122            "bus - show onewire bus info (all)\n"
 123            "w1 read [<bus> [<dev> [offset [length]]]]"
 124            "    - read from onewire device 'dev' on onewire bus 'bus'"
 125            " starting from offset 'offset' and length 'length'\n"
 126            "      defaults: bus 0, dev 0, offset 0, length 512 bytes.");