1 // SPDX-License-Identifier: GPL-2.0+
4 * Copyright (c) 2015 Free Electrons
5 * Copyright (c) 2015 NextThing Co.
6 * Copyright (c) 2018 Microchip Technology, Inc.
8 * Maxime Ripard <maxime.ripard@free-electrons.com>
9 * Eugen Hristev <eugen.hristev@microchip.com>
17 #include <w1-eeprom.h>
19 #include <dm/device-internal.h>
21 int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
22 u8 *buf, unsigned int count)
24 const struct w1_eeprom_ops *ops = device_get_ops(dev);
31 ret = w1_eeprom_get_id(dev, &id);
37 return ops->read_buf(dev, offset, buf, count);
40 int w1_eeprom_register_new_device(u64 id)
42 u8 family = id & 0xff;
46 for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
48 uclass_next_device(&dev)) {
50 debug("cannot find w1 eeprom dev\n");
53 if (dev_get_driver_data(dev) == family) {
56 w1 = dev_get_parent_platdata(dev);
57 if (w1->id) /* device already in use */
60 debug("%s: Match found: %s:%s %llx\n", __func__,
61 dev->name, dev->driver->name, id);
66 debug("%s: No matches found: error %d\n", __func__, ret);
71 int w1_eeprom_get_id(struct udevice *dev, u64 *id)
73 struct w1_device *w1 = dev_get_parent_platdata(dev);
82 UCLASS_DRIVER(w1_eeprom) = {
84 .id = UCLASS_W1_EEPROM,
85 .flags = DM_UC_FLAG_SEQ_ALIAS,
86 #if CONFIG_IS_ENABLED(OF_CONTROL)
87 .post_bind = dm_scan_fdt_dev,
91 int w1_eeprom_dm_init(void)
97 ret = uclass_get(UCLASS_W1_EEPROM, &uc);
99 debug("W1_EEPROM uclass not available\n");
103 uclass_foreach_dev(dev, uc) {
104 ret = device_probe(dev);
105 if (ret == -ENODEV) { /* No such device. */
106 debug("W1_EEPROM not available.\n");
110 if (ret) { /* Other error. */
111 printf("W1_EEPROM probe failed, error %d\n", ret);