113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 MediaTek Inc.
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*/
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include "ccci_rtc.h"
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#include "ccci_core.h"
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#include "ccci_debug.h"
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#define TAG "ccci_rtc"
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static int g_ccci_rtc_val;
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int mtk_crystal_exist_status(void)
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{
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CCCI_ERROR_LOG(-1, TAG, "[%s] g_ccci_rtc_val : %d.",
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__func__, g_ccci_rtc_val);
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return g_ccci_rtc_val;
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}
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EXPORT_SYMBOL(mtk_crystal_exist_status);
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static int ccci_get_rtc_info(struct platform_device *pdev)
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{
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struct nvmem_cell *cell = NULL;
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u8 *buf = NULL;
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ssize_t len = 0;
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cell = nvmem_cell_get(&pdev->dev, "external-32k");
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if (!cell) {
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CCCI_ERROR_LOG(-1, TAG, "[%s] nvmem_cell_get fail: %zu",
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__func__, PTR_ERR(cell));
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return -1;
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}
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if (IS_ERR(cell)) {
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CCCI_ERROR_LOG(-1, TAG, "[%s] nvmem_cell_get fail: %zu",
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__func__, PTR_ERR(cell));
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if (PTR_ERR(cell) == -EPROBE_DEFER)
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return PTR_ERR(cell);
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goto fail;
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}
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buf = (u8 *)nvmem_cell_read(cell, &len);
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nvmem_cell_put(cell);
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if (IS_ERR(buf)) {
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CCCI_ERROR_LOG(-1, TAG, "[%s] nvmem_cell_read fail: %zu\n",
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__func__, PTR_ERR(buf));
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goto fail;
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}
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g_ccci_rtc_val = (u8)(*buf);
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kfree(buf);
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CCCI_NORMAL_LOG(-1, TAG, "[%s] g_ccci_rtc_val = %d; len = %zu\n",
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__func__, g_ccci_rtc_val, len);
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return 0;
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fail:
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return -1;
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}
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static int ccci_rtc_probe(struct platform_device *pdev)
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{
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return ccci_get_rtc_info(pdev);
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}
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static const struct of_device_id ccci_rtc_of_ids[] = {
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{.compatible = "mediatek,md_ccci_rtc"},
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{}
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};
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static struct platform_driver ccci_rtc_driver = {
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.driver = {
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.name = "md_ccci_rtc",
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.of_match_table = ccci_rtc_of_ids,
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},
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.probe = ccci_rtc_probe,
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};
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static int __init ccci_rtc_init(void)
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{
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int ret;
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ret = platform_driver_register(&ccci_rtc_driver);
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if (ret) {
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CCCI_ERROR_LOG(-1, TAG, "ccci rtc driver init fail %d", ret);
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return ret;
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}
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return 0;
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}
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module_init(ccci_rtc_init);
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MODULE_AUTHOR("ccci");
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MODULE_DESCRIPTION("ccci rtc driver");
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MODULE_LICENSE("GPL");
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