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
ds24xxx_read_buf(struct udevice * dev,unsigned int offset,u8 * buf,unsigned int count)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
ds24xxx_probe(struct udevice * dev)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