Add a sandbox driver for a one wire EEPROM memory Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>lime2-spi
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/* SPDX-License-Identifier: GPL-2.0+
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* |
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* Copyright (c) 2018 Microchip Technology, Inc. |
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* |
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*/ |
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#include <common.h> |
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#include <linux/err.h> |
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#include <dm.h> |
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#include <w1-eeprom.h> |
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#include <w1.h> |
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#define W1_F2D_READ_EEPROM 0xf0 |
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#define EEP_SANDBOX_SAMPLE_MEM "this is a sample EEPROM memory string." |
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static int eep_sandbox_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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/* do not allow to copy more than our maximum sample string */ |
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if (offset + count < strlen(EEP_SANDBOX_SAMPLE_MEM)) { |
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offset = 0; |
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count = strlen(EEP_SANDBOX_SAMPLE_MEM); |
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} |
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strncpy((char *)buf, EEP_SANDBOX_SAMPLE_MEM, count); |
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/*
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* in case the w1 subsystem uses some different kind of sandbox testing, |
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* like randomized gpio values , we take the buffer from there |
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*/ |
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w1_reset_select(dev); |
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w1_write_byte(dev, W1_F2D_READ_EEPROM); |
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w1_write_byte(dev, offset & 0xff); |
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w1_write_byte(dev, offset >> 8); |
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w1_read_buf(dev, buf, count); |
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/*
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* even if read buf from w1 fails, return success as we hardcoded |
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* the buffer. |
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*/ |
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return 0; |
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} |
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static const struct w1_eeprom_ops eep_sandbox_ops = { |
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.read_buf = eep_sandbox_read_buf, |
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}; |
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static const struct udevice_id eep_sandbox_id[] = { |
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{ .compatible = "sandbox,w1-eeprom", .data = W1_FAMILY_EEP_SANDBOX }, |
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{ }, |
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}; |
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U_BOOT_DRIVER(eep_sandbox) = { |
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.name = "eep_sandbox", |
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.id = UCLASS_W1_EEPROM, |
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.of_match = eep_sandbox_id, |
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.ops = &eep_sandbox_ops, |
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}; |
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