xref: /openbmc/u-boot/cmd/w1.c (revision 48f8e159)
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(cmd_tbl_t *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.");
127