10749f646SMaxime Ripard // SPDX-License-Identifier: GPL-2.0+ 20749f646SMaxime Ripard /* 30749f646SMaxime Ripard * 40749f646SMaxime Ripard * Copyright (c) 2015 Free Electrons 50749f646SMaxime Ripard * Copyright (c) 2015 NextThing Co 60749f646SMaxime Ripard * Copyright (c) 2018 Microchip Technology, Inc. 70749f646SMaxime Ripard * 80749f646SMaxime Ripard */ 90749f646SMaxime Ripard 100749f646SMaxime Ripard #include <common.h> 110749f646SMaxime Ripard #include <linux/err.h> 120749f646SMaxime Ripard #include <dm.h> 130749f646SMaxime Ripard #include <w1-eeprom.h> 140749f646SMaxime Ripard #include <w1.h> 150749f646SMaxime Ripard 160749f646SMaxime Ripard #define W1_F2D_READ_EEPROM 0xf0 170749f646SMaxime Ripard 180749f646SMaxime Ripard static int ds24xxx_read_buf(struct udevice *dev, unsigned int offset, 190749f646SMaxime Ripard u8 *buf, unsigned int count) 200749f646SMaxime Ripard { 210749f646SMaxime Ripard w1_reset_select(dev); 220749f646SMaxime Ripard 230749f646SMaxime Ripard w1_write_byte(dev, W1_F2D_READ_EEPROM); 240749f646SMaxime Ripard w1_write_byte(dev, offset & 0xff); 250749f646SMaxime Ripard w1_write_byte(dev, offset >> 8); 260749f646SMaxime Ripard 270749f646SMaxime Ripard return w1_read_buf(dev, buf, count); 280749f646SMaxime Ripard } 290749f646SMaxime Ripard 300749f646SMaxime Ripard static int ds24xxx_probe(struct udevice *dev) 310749f646SMaxime Ripard { 320749f646SMaxime Ripard struct w1_device *w1; 330749f646SMaxime Ripard 34*586d4b01SMartin Fuzzey w1 = dev_get_parent_platdata(dev); 350749f646SMaxime Ripard w1->id = 0; 360749f646SMaxime Ripard return 0; 370749f646SMaxime Ripard } 380749f646SMaxime Ripard 390749f646SMaxime Ripard static const struct w1_eeprom_ops ds24xxx_ops = { 400749f646SMaxime Ripard .read_buf = ds24xxx_read_buf, 410749f646SMaxime Ripard }; 420749f646SMaxime Ripard 430749f646SMaxime Ripard static const struct udevice_id ds24xxx_id[] = { 440749f646SMaxime Ripard { .compatible = "maxim,ds24b33", .data = W1_FAMILY_DS24B33 }, 450749f646SMaxime Ripard { .compatible = "maxim,ds2431", .data = W1_FAMILY_DS2431 }, 460749f646SMaxime Ripard { }, 470749f646SMaxime Ripard }; 480749f646SMaxime Ripard 490749f646SMaxime Ripard U_BOOT_DRIVER(ds24xxx) = { 500749f646SMaxime Ripard .name = "ds24xxx", 510749f646SMaxime Ripard .id = UCLASS_W1_EEPROM, 520749f646SMaxime Ripard .of_match = ds24xxx_id, 530749f646SMaxime Ripard .ops = &ds24xxx_ops, 540749f646SMaxime Ripard .probe = ds24xxx_probe, 550749f646SMaxime Ripard }; 56