1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * 4 * Copyright (c) 2015 Free Electrons 5 * Copyright (c) 2015 NextThing Co 6 * Copyright (c) 2018 Microchip Technology, Inc. 7 * 8 */ 9 10 #include <common.h> 11 #include <linux/err.h> 12 #include <dm.h> 13 #include <w1-eeprom.h> 14 #include <w1.h> 15 16 #define W1_F2D_READ_EEPROM 0xf0 17 18 static int ds24xxx_read_buf(struct udevice *dev, unsigned int offset, 19 u8 *buf, unsigned int count) 20 { 21 w1_reset_select(dev); 22 23 w1_write_byte(dev, W1_F2D_READ_EEPROM); 24 w1_write_byte(dev, offset & 0xff); 25 w1_write_byte(dev, offset >> 8); 26 27 return w1_read_buf(dev, buf, count); 28 } 29 30 static int ds24xxx_probe(struct udevice *dev) 31 { 32 struct w1_device *w1; 33 34 w1 = dev_get_parent_platdata(dev); 35 w1->id = 0; 36 return 0; 37 } 38 39 static const struct w1_eeprom_ops ds24xxx_ops = { 40 .read_buf = ds24xxx_read_buf, 41 }; 42 43 static const struct udevice_id ds24xxx_id[] = { 44 { .compatible = "maxim,ds24b33", .data = W1_FAMILY_DS24B33 }, 45 { .compatible = "maxim,ds2431", .data = W1_FAMILY_DS2431 }, 46 { }, 47 }; 48 49 U_BOOT_DRIVER(ds24xxx) = { 50 .name = "ds24xxx", 51 .id = UCLASS_W1_EEPROM, 52 .of_match = ds24xxx_id, 53 .ops = &ds24xxx_ops, 54 .probe = ds24xxx_probe, 55 }; 56