52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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/*
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* Copyright (c) 2023 Grinn
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT maxim_max20335
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#include <errno.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/sys/util.h>
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#define MAX20335_REG_CHIP_ID 0x00
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#define MAX20335_CHIP_ID_VAL 0x04
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struct mfd_max20335_config {
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struct i2c_dt_spec bus;
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};
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static int mfd_max20335_init(const struct device *dev)
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{
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const struct mfd_max20335_config *config = dev->config;
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uint8_t val;
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int ret;
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if (!i2c_is_ready_dt(&config->bus)) {
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return -ENODEV;
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}
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ret = i2c_reg_read_byte_dt(&config->bus, MAX20335_REG_CHIP_ID, &val);
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if (ret < 0) {
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return ret;
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}
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if (val != MAX20335_CHIP_ID_VAL) {
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return -ENODEV;
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}
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return 0;
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}
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#define MFD_MA20335_DEFINE(inst) \
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static const struct mfd_max20335_config mfd_max20335_config##inst = { \
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.bus = I2C_DT_SPEC_INST_GET(inst), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, mfd_max20335_init, NULL, NULL, \
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&mfd_max20335_config##inst, POST_KERNEL, \
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CONFIG_MFD_INIT_PRIORITY, NULL);
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DT_INST_FOREACH_STATUS_OKAY(MFD_MA20335_DEFINE)
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