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 * Maxime Ripard <maxime.ripard@free-electrons.com>
9 * Eugen Hristev <eugen.hristev@microchip.com>
10 *
11 */
12
13#define LOG_CATEGORY UCLASS_W1_EEPROM
14
15#include <common.h>
16#include <dm.h>
17#include <log.h>
18#include <w1.h>
19#include <w1-eeprom.h>
20
21#include <dm/device-internal.h>
22
23int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
24		       u8 *buf, unsigned int count)
25{
26	const struct w1_eeprom_ops *ops = device_get_ops(dev);
27	u64 id = 0;
28	int ret;
29
30	if (!ops->read_buf)
31		return -ENOSYS;
32
33	ret = w1_eeprom_get_id(dev, &id);
34	if (ret)
35		return ret;
36	if (!id)
37		return -ENODEV;
38
39	return ops->read_buf(dev, offset, buf, count);
40}
41
42int w1_eeprom_get_id(struct udevice *dev, u64 *id)
43{
44	struct w1_device *w1 = dev_get_parent_plat(dev);
45
46	if (!w1)
47		return -ENODEV;
48	*id = w1->id;
49
50	return 0;
51}
52
53UCLASS_DRIVER(w1_eeprom) = {
54	.name		= "w1_eeprom",
55	.id		= UCLASS_W1_EEPROM,
56	.flags		= DM_UC_FLAG_SEQ_ALIAS,
57#if CONFIG_IS_ENABLED(OF_CONTROL)
58	.post_bind	= dm_scan_fdt_dev,
59#endif
60};
61
62int w1_eeprom_dm_init(void)
63{
64	struct udevice *dev;
65	struct uclass *uc;
66	int ret;
67
68	ret = uclass_get(UCLASS_W1_EEPROM, &uc);
69	if (ret) {
70		debug("W1_EEPROM uclass not available\n");
71		return ret;
72	}
73
74	uclass_foreach_dev(dev, uc) {
75		ret = device_probe(dev);
76		if (ret == -ENODEV) {	/* No such device. */
77			debug("W1_EEPROM not available.\n");
78			continue;
79		}
80
81		if (ret) {		/* Other error. */
82			printf("W1_EEPROM probe failed, error %d\n", ret);
83			continue;
84		}
85	}
86
87	return 0;
88}
89