134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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* Driver for adc demo on Firefly board.
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*
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* Copyright (C) 2016, Zhongshan T-chip Intelligent Technology Co.,ltd.
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* Copyright 2006 ZL.Guan
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* NOTE: This demo is only applicable to: Firefly-RK3588 */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/consumer.h>
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#define FIREFLY_ADC_SAMPLE_JIFFIES (50 / (MSEC_PER_SEC / HZ))
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#define FIREFLY_FAN_ABSOLUTE_VALUE 500
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#define VREF 1800
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struct iio_channel *chan;
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struct delayed_work adc_poll_work;
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bool fan_insert;
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int count;
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static void firefly_demo_adc_poll(struct work_struct *work)
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{
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int ret,raw;
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int result = -1;
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ret = iio_read_channel_raw(chan, &raw);
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if (ret < 0) {
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printk("read hook adc channel() error: %d\n", ret);
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return;
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}
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if(raw < FIREFLY_FAN_ABSOLUTE_VALUE && !fan_insert){
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if(count < 8) count++;
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else{
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fan_insert = true;
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count = 0;
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result = (VREF*raw)/4095 ;//Vref / (2^n-1) = Vresult / raw
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printk("Fan insert! raw= %d Voltage= %dmV\n",raw,result);
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}
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}
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else if(raw > FIREFLY_FAN_ABSOLUTE_VALUE && fan_insert){
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if(count < 8) count++;
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else{
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fan_insert = false;
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count = 0;
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result = (VREF*raw)/4095;
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printk("Fan out! raw= %d Voltage=%dmV\n",raw,result);
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}
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}
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else count = 0;
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schedule_delayed_work(&adc_poll_work, FIREFLY_ADC_SAMPLE_JIFFIES);
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}
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static int firefly_adc_probe(struct platform_device *pdev)
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{
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printk("firefly_adc_probe!\n");
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count = 0;
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chan = iio_channel_get(&(pdev->dev), NULL);
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if (IS_ERR(chan))
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{
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chan = NULL;
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printk("%s() have not set adc chan\n", __FUNCTION__);
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return -1;
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}
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fan_insert = false;
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if (chan) {
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INIT_DELAYED_WORK(&adc_poll_work, firefly_demo_adc_poll);
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schedule_delayed_work(&adc_poll_work,1000);
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}
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return 0;
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}
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static int firefly_adc_remove(struct platform_device *pdev)
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{
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printk("firefly_adc_remove!\n");
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iio_channel_release(chan);
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return 0;
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}
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static const struct of_device_id firefly_adc_match[] = {
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{ .compatible = "firefly,rk3588-adc" },
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{},
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};
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static struct platform_driver firefly_adc_driver = {
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.probe = firefly_adc_probe,
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.remove = firefly_adc_remove,
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.driver = {
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.name = "firefly_adc",
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.owner = THIS_MODULE,
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.of_match_table = firefly_adc_match,
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},
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};
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static int firefly_adc_init(void)
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{
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int ret ;
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printk("Firefly adc init\n");
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printk("Firefly adc-->FIREFLY_ADC_SAMPLE_JIFFIES: %ld \n",FIREFLY_ADC_SAMPLE_JIFFIES);
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printk("Firefly adc-->MSEC_PER_SEC: %ld \n",MSEC_PER_SEC);
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printk("Firefly adc-->HZ: %d \n",HZ);
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ret = platform_driver_register(&firefly_adc_driver);
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printk("Firefly adc-->ret: %d \n",ret);
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return 0;
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}
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static void firefly_adc_exit(void)
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{
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printk("Firefly adc exit\n");
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platform_driver_unregister(&firefly_adc_driver);
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}
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module_init(firefly_adc_init);
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module_exit(firefly_adc_exit);
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MODULE_AUTHOR("maocl <service@t-firefly.com>");
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MODULE_DESCRIPTION("Firefly adc demo driver");
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MODULE_ALIAS("platform:firefly-adc");
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MODULE_LICENSE("GPL");
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