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