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@@ -0,0 +1,116 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ *
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+ * Copyright (c) 2015 Free Electrons
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+ * Copyright (c) 2015 NextThing Co.
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+ * Copyright (c) 2018 Microchip Technology, Inc.
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+ *
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+ * Maxime Ripard <maxime.ripard@free-electrons.com>
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+ * Eugen Hristev <eugen.hristev@microchip.com>
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+ *
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <w1.h>
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+#include <w1-eeprom.h>
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+
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+#include <dm/device-internal.h>
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+
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+int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset,
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+ u8 *buf, unsigned int count)
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+{
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+ const struct w1_eeprom_ops *ops = device_get_ops(dev);
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+ u64 id = 0;
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+ int ret;
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+
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+ if (!ops->read_buf)
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+ return -ENOSYS;
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+
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+ ret = w1_eeprom_get_id(dev, &id);
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+ if (ret)
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+ return ret;
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+ if (!id)
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+ return -ENODEV;
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+
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+ return ops->read_buf(dev, offset, buf, count);
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+}
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+
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+int w1_eeprom_register_new_device(u64 id)
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+{
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+ u8 family = id & 0xff;
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+ int ret;
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+ struct udevice *dev;
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+
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+ for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
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+ !ret && dev;
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+ uclass_next_device(&dev)) {
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+ if (ret || !dev) {
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+ debug("cannot find w1 eeprom dev\n");
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+ return ret;
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+ }
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+ if (dev_get_driver_data(dev) == family) {
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+ struct w1_device *w1;
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+
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+ w1 = dev_get_parent_platdata(dev);
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+ if (w1->id) /* device already in use */
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+ continue;
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+ w1->id = id;
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+ debug("%s: Match found: %s:%s %llx\n", __func__,
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+ dev->name, dev->driver->name, id);
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+ return 0;
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+ }
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+ }
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+
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+ debug("%s: No matches found: error %d\n", __func__, ret);
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+
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+ return ret;
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+}
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+
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+int w1_eeprom_get_id(struct udevice *dev, u64 *id)
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+{
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+ struct w1_device *w1 = dev_get_parent_platdata(dev);
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+
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+ if (!w1)
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+ return -ENODEV;
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+ *id = w1->id;
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+
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+ return 0;
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+}
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+
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+UCLASS_DRIVER(w1_eeprom) = {
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+ .name = "w1_eeprom",
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+ .id = UCLASS_W1_EEPROM,
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+ .flags = DM_UC_FLAG_SEQ_ALIAS,
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+#if CONFIG_IS_ENABLED(OF_CONTROL)
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+ .post_bind = dm_scan_fdt_dev,
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+#endif
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+};
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+
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+int w1_eeprom_dm_init(void)
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+{
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+ struct udevice *dev;
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+ struct uclass *uc;
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+ int ret;
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+
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+ ret = uclass_get(UCLASS_W1_EEPROM, &uc);
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+ if (ret) {
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+ debug("W1_EEPROM uclass not available\n");
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+ return ret;
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+ }
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+
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+ uclass_foreach_dev(dev, uc) {
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+ ret = device_probe(dev);
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+ if (ret == -ENODEV) { /* No such device. */
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+ debug("W1_EEPROM not available.\n");
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+ continue;
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+ }
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+
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+ if (ret) { /* Other error. */
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+ printf("W1_EEPROM probe failed, error %d\n", ret);
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+ continue;
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+ }
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+ }
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+
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+ return 0;
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+}
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