1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* 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.");
|