d05266f7c5
Add basic command for bus information and read for onewire bus using Dallas 1-Wire protocol. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+
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*
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* (C) Copyright 2018
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* Microchip Technology, Inc.
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* Eugen Hristev <eugen.hristev@microchip.com>
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*/
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#include <common.h>
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#include <command.h>
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#include <w1.h>
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#include <w1-eeprom.h>
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#include <dm/device-internal.h>
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static int w1_bus(void)
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{
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struct udevice *bus, *dev;
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int ret;
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ret = w1_get_bus(0, &bus);
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if (ret) {
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printf("one wire interface not found\n");
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return CMD_RET_FAILURE;
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}
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printf("Bus %d:\t%s", bus->seq, bus->name);
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if (device_active(bus))
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printf(" (active)");
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printf("\n");
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for (device_find_first_child(bus, &dev);
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dev;
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device_find_next_child(&dev)) {
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ret = device_probe(dev);
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printf("\t%s (%d) uclass %s : ", dev->name, dev->seq,
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dev->uclass->uc_drv->name);
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if (ret)
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printf("device error\n");
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else
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printf("family 0x%x\n", w1_get_device_family(dev));
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}
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return CMD_RET_SUCCESS;
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}
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static int w1_read(int argc, char *const argv[])
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{
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int bus_n = 0, dev_n = 0, offset = 0, len = 512;
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int i;
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struct udevice *bus, *dev;
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int ret;
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u8 buf[512];
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if (argc > 2)
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bus_n = simple_strtoul(argv[2], NULL, 10);
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if (argc > 3)
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dev_n = simple_strtoul(argv[3], NULL, 10);
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if (argc > 4)
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offset = simple_strtoul(argv[4], NULL, 10);
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if (argc > 5)
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len = simple_strtoul(argv[5], NULL, 10);
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if (len > 512) {
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printf("len needs to be <= 512\n");
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return CMD_RET_FAILURE;
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}
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ret = w1_get_bus(bus_n, &bus);
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if (ret) {
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printf("one wire interface not found\n");
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return CMD_RET_FAILURE;
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}
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for (device_find_first_child(bus, &dev), i = 0;
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dev && i <= dev_n;
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device_find_next_child(&dev), i++) {
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ret = device_probe(dev);
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if (!ret && i == dev_n)
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break;
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}
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if (i != dev_n || ret || !dev) {
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printf("invalid dev\n");
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return CMD_RET_FAILURE;
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}
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if (strcmp(dev->uclass->uc_drv->name, "w1_eeprom")) {
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printf("the device present on the interface is of unknown device class\n");
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return CMD_RET_FAILURE;
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}
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ret = w1_eeprom_read_buf(dev, offset, (u8 *)buf, len);
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if (ret) {
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printf("error reading device %s\n", dev->name);
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return CMD_RET_FAILURE;
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}
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for (i = 0; i < len; i++)
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printf("%x", buf[i]);
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printf("\n");
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return CMD_RET_SUCCESS;
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}
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int do_w1(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
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{
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if (argc < 2)
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return CMD_RET_USAGE;
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if (!strcmp(argv[1], "bus"))
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return w1_bus();
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if (!strcmp(argv[1], "read"))
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return w1_read(argc, argv);
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(w1, 6, 0, do_w1,
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"onewire interface utility commands",
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"bus - show onewire bus info (all)\n"
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"w1 read [<bus> [<dev> [offset [length]]]]"
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" - read from onewire device 'dev' on onewire bus 'bus'"
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" starting from offset 'offset' and length 'length'\n"
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" defaults: bus 0, dev 0, offset 0, length 512 bytes.");
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