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https://github.com/physwizz/a155-U-u1.git
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147 lines
2.8 KiB
C
147 lines
2.8 KiB
C
// 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/module.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/iio.h>
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#include "ccci_config.h"
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#include "ccci_common_config.h"
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#include "ccci_core.h"
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#include "ccci_debug.h"
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#define TAG "ccci_adc"
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static struct device *md_adc_pdev;
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static int adc_num;
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static int adc_val;
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static int adc_mV;
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#ifdef CCCI_KMODULE_ENABLE
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/*
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* for debug log:
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* 0 to disable; 1 for print to ram; 2 for print to uart
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* other value to desiable all log
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*/
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#ifndef CCCI_LOG_LEVEL /* for platform override */
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#define CCCI_LOG_LEVEL CCCI_LOG_CRITICAL_UART
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#endif
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unsigned int ccci_debug_enable = CCCI_LOG_LEVEL;
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#endif
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static int ccci_get_adc_info(struct device *dev)
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{
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int ret, val, mV;
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struct iio_channel *md_channel;
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adc_val = -1;
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adc_mV = -1;
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md_channel = iio_channel_get(dev, "md-channel");
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ret = IS_ERR(md_channel);
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if (ret) {
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if (PTR_ERR(md_channel) == -EPROBE_DEFER) {
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CCCI_ERROR_LOG(-1, TAG, "%s EPROBE_DEFER\r\n",
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__func__);
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return -EPROBE_DEFER;
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}
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CCCI_ERROR_LOG(-1, TAG, "fail to get iio channel (%d)", ret);
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goto Fail;
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}
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adc_num = md_channel->channel->channel;
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ret = iio_read_channel_raw(md_channel, &val);
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if (ret < 0) {
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iio_channel_release(md_channel);
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CCCI_ERROR_LOG(-1, TAG, "iio_read_channel_raw fail");
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goto Fail;
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}
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adc_val = val;
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ret = iio_read_channel_processed(md_channel, &mV);
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iio_channel_release(md_channel);
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if (ret < 0) {
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CCCI_ERROR_LOG(-1, TAG, "iio_read_channel_processed fail");
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goto Fail;
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}
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adc_mV = mV;
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CCCI_NORMAL_LOG(0, TAG, "md_ch = %d, raw_val = %d[%dmV]\n",
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adc_num, val, mV);
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return ret;
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Fail:
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return -1;
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}
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int ccci_get_adc_num(void)
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{
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return adc_num;
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}
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EXPORT_SYMBOL(ccci_get_adc_num);
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int ccci_get_adc_val(void)
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{
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return adc_val;
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}
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EXPORT_SYMBOL(ccci_get_adc_val);
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int ccci_get_adc_mV(void)
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{
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return adc_mV;
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}
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EXPORT_SYMBOL(ccci_get_adc_mV);
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int get_auxadc_probe(struct platform_device *pdev)
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{
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int ret;
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ret = ccci_get_adc_info(&pdev->dev);
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if (ret < 0) {
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CCCI_ERROR_LOG(-1, TAG, "ccci get adc info fail");
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return ret;
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}
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md_adc_pdev = &pdev->dev;
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return 0;
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}
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static const struct of_device_id ccci_auxadc_of_ids[] = {
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{.compatible = "mediatek,md_auxadc"},
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{}
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};
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static struct platform_driver ccci_auxadc_driver = {
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.driver = {
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.name = "ccci_auxadc",
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.of_match_table = ccci_auxadc_of_ids,
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},
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.probe = get_auxadc_probe,
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};
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static int __init ccci_auxadc_init(void)
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{
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int ret;
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ret = platform_driver_register(&ccci_auxadc_driver);
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if (ret) {
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CCCI_ERROR_LOG(-1, TAG, "ccci auxadc 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_auxadc_init);
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MODULE_AUTHOR("ccci");
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MODULE_DESCRIPTION("ccci auxadc driver");
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MODULE_LICENSE("GPL");
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