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分享android rtc驱动问题
1. android4.4, i2c接口外部rtc驱动。写驱动的时候，发现发rtc注册到i2c device下面时（rtc = devm_rtc_device_register(&client->dev, em3027_driver.driver.name, &em3027_rtc_ops, THIS_MODULE);），android系统里面设置时间时，
驱动会提示找不到rtc设备;
只有注册到paltform_dev下面时，android系统设置时间时才会找到rtc设备(priv->rtc = rtc_device_register("aml_rtc", &pdev->dev, &aml_rtc_ops, THIS_MODULE);).
android系统设置时间时，会调用 到kernel中的drivers/staging/android/alarm-dev.c
2. i2c的rtc驱动 :rtc注册到&client->dev时，android系统里面设置时间时找不到rtc设备。
3. 如果是注册到platform device下面, 操作rtc时，又获取不到i2c_client。请问如何去获取i2c_client?
驱动会提示找不到rtc设备;
只有注册到paltform_dev下面时，android系统设置时间时才会找到rtc设备(priv->rtc = rtc_device_register("aml_rtc", &pdev->dev, &aml_rtc_ops, THIS_MODULE);).
android系统设置时间时，会调用 到kernel中的drivers/staging/android/alarm-dev.c
static int alarm_set_rtc(struct timespec *ts)
{
struct rtc_time new_rtc_tm;
struct rtc_device *rtc_dev;
unsigned long flags;
int rv = 0;
rtc_time_to_tm(ts->tv_sec, &new_rtc_tm);
rtc_dev = alarmtimer_get_rtcdev(); //rtc注册到i2c device中时，这里就找获取不到rtc_dev
rv = do_settimeofday(ts);
if (rv < 0)
return rv;
if (rtc_dev)
{
printk("#### [kernel] %s %s %d ####\n", __FILE__, __FUNCTION__, __LINE__);
rv = rtc_set_time(rtc_dev, &new_rtc_tm);
}
spin_lock_irqsave(&alarm_slock, flags);
alarm_pending |= ANDROID_ALARM_TIME_CHANGE_MASK;
wake_up(&alarm_wait_queue);
spin_unlock_irqrestore(&alarm_slock, flags);
return rv;
}
2. i2c的rtc驱动 :rtc注册到&client->dev时，android系统里面设置时间时找不到rtc设备。
/*
* An rtc/i2c driver for the EM Microelectronic EM3027
* Copyright 2011 CompuLab, Ltd.
*
* Author: Mike Rapoport <mike@compulab.co.il>
*
* Based on rtc-ds1672.c by Alessandro Zummo <a.zummo@towertech.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/module.h>
/* Registers */
#define EM3027_REG_ON_OFF_CTRL 0x00
#define EM3027_REG_IRQ_CTRL 0x01
#define EM3027_REG_IRQ_FLAGS 0x02
#define EM3027_REG_STATUS 0x03
#define EM3027_REG_RST_CTRL 0x04
#define EM3027_REG_WATCH_SEC 0x08
#define EM3027_REG_WATCH_MIN 0x09
#define EM3027_REG_WATCH_HOUR 0x0a
#define EM3027_REG_WATCH_DATE 0x0b
#define EM3027_REG_WATCH_DAY 0x0c
#define EM3027_REG_WATCH_MON 0x0d
#define EM3027_REG_WATCH_YEAR 0x0e
#define EM3027_REG_ALARM_SEC 0x10
#define EM3027_REG_ALARM_MIN 0x11
#define EM3027_REG_ALARM_HOUR 0x12
#define EM3027_REG_ALARM_DATE 0x13
#define EM3027_REG_ALARM_DAY 0x14
#define EM3027_REG_ALARM_MON 0x15
#define EM3027_REG_ALARM_YEAR 0x16
static struct i2c_driver em3027_driver;
static int em3027_get_time(struct device *dev, struct rtc_time *tm)
{
return 0;
}
static int em3027_set_time(struct device *dev, struct rtc_time *tm)
{
return 0;
}
static const struct rtc_class_ops em3027_rtc_ops = {
.read_time = em3027_get_time,
.set_time = em3027_set_time,
};
//em3027_probe中, rtc注册到&client->dev时，android系统里面设置时间时找不到rtc设备。
static int em3027_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct rtc_device *rtc;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
rtc = devm_rtc_device_register(&client->dev, em3027_driver.driver.name, &em3027_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
i2c_set_clientdata(client, rtc);
return 0;
}
static int em3027_remove(struct i2c_client *client)
{
return 0;
}
static struct i2c_device_id em3027_id[] = {
{ "i2c-rtc", 0 },
{ }
};
static struct i2c_driver em3027_driver = {
.driver = {
.name = "aml-rtc-em3027",
},
.probe = &em3027_probe,
.remove = &em3027_remove,
.id_table = em3027_id,
};
module_i2c_driver(em3027_driver);
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_DESCRIPTION("EM Microelectronic EM3027 RTC driver");
MODULE_LICENSE("GPL");
3. 如果是注册到platform device下面, 操作rtc时，又获取不到i2c_client。请问如何去获取i2c_client?
/*
* this driver is written for the internal rtc for M1
*/
#include<linux/module.h>
#include<linux/platform_device.h>
#include<linux/rtc.h>
#include<linux/slab.h>
#include<asm/delay.h>
#include<mach/am_regs.h>
#if MESON_CPU_TYPE >= MESON_CPU_TYPE_MESON6
#include <plat/io.h>
#endif
#include <linux/of.h>
struct aml_rtc_priv{
struct rtc_device *rtc;
unsigned long base_addr;
struct timer_list timer;
struct work_struct work;
struct workqueue_struct *rtc_work_queue;
};
typedef struct alarm_data_s {
int level;
unsigned alarm_sec; //in s
} alarm_data_t;
//这里的to_i2c_client找不到dev
static int aml_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
return pt7c4337_get_datetime(to_i2c_client(dev), tm);
}
static int aml_rtc_write_time(struct device *dev, struct rtc_time *tm)
{
return pt7c4337_set_datetime(to_i2c_client(dev), tm);
}
static const struct rtc_class_ops aml_rtc_ops ={
.read_time = aml_rtc_read_time,
.set_time = aml_rtc_write_time,
.set_alarm = aml_rtc_set_alarm,
};
static int aml_rtc_probe(struct platform_device *pdev)
{
struct aml_rtc_priv *priv;
struct device_node* aml_rtc_node = pdev->dev.of_node;
int ret;
int sec_adjust = 0;
priv = (struct aml_rtc_priv *)kzalloc(sizeof(*priv), GFP_KERNEL);
if(!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
/* platform setup code should have handled this; sigh */
if (!device_can_wakeup(&pdev->dev))
device_init_wakeup(&pdev->dev, 1);
priv->rtc = rtc_device_register("aml_rtc", &pdev->dev, &aml_rtc_ops, THIS_MODULE);
if(IS_ERR(priv->rtc)){
ret = PTR_ERR(priv->rtc);
goto out;
}
return 0;
out:
if(priv->rtc_work_queue)
destroy_workqueue(priv->rtc_work_queue);
kfree(priv);
return ret;
}
static const struct of_device_id meson6_rtc_dt_match[]={
{ .compatible = "amlogic,aml_rtc"},
{},
};
struct platform_driver aml_rtc_driver = {
.driver = {
.name = "aml_rtc",
.owner = THIS_MODULE,
.of_match_table=meson6_rtc_dt_match,
},
.probe = aml_rtc_probe,
};
static int __init aml_rtc_init(void)
{
return platform_driver_register(&aml_rtc_driver);
}
static void __init aml_rtc_exit(void)
{
return platform_driver_unregister(&aml_rtc_driver);
}
module_init(aml_rtc_init);
module_exit(aml_rtc_exit);
MODULE_DESCRIPTION("Amlogic internal rtc driver");
MODULE_LICENSE("GPL");
...全文
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刘大球 2016-10-25
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这个方法是有效的。提醒，在驱动中set_alarm要有，否则
if (!rtc->ops->set_alarm)就也是-1了。
感谢大家
houyizi313 2016-09-12
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这是因为alarmtimer.c中alarmtimer_rtc_add_device()函数中对if (!device_may_wakeup(rtc->dev.parent)) return -1;直接返回了；在你的i2c的rtc的probe驱动增加一行： device_init_wakeup(&client->dev, true); 就解决了；
static int rx8010_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct rx8010_data *rx8010;
int err, need_reset = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
dev_err(&adapter->dev, "doesn't support required functionality\n");
err = -EIO;
goto errout;
}
rx8010 = kzalloc(sizeof(*rx8010), GFP_KERNEL);
if (!rx8010) {
dev_err(&adapter->dev, "failed to alloc memory\n");
err = -ENOMEM;
goto errout;
}
rx8010->client = client;
i2c_set_clientdata(client, rx8010);
INIT_WORK(&rx8010->work, rx8010_work);
device_init_wakeup(&client->dev, true); //解决alarm_set_rtc@163 rtc_dev->name=(null)
err = rx8010_init_client(client, &need_reset);
if (err)
goto errout_free;
if (need_reset) {
struct rtc_time tm;
dev_info(&client->dev, "bad conditions detected, resetting date\n");
rtc_time_to_tm(0, &tm); // set to 1970/1/1
rx8010_set_time(&client->dev, &tm);
}
rx8010->rtc = rtc_device_register(client->name, &client->dev, &rx8010_rtc_ops, THIS_MODULE); //cat /sys/class/rtc/rtc0/name=>rx8010
//rx8010->rtc = devm_rtc_device_register(&client->dev, rx8010_driver.driver.name,&rx8010_rtc_ops, THIS_MODULE);
if (IS_ERR(rx8010->rtc)) {
err = PTR_ERR(rx8010->rtc);
dev_err(&client->dev, "unable to register the class device\n");
goto errout_free;
}
if (client->irq > 0) {
dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
err = devm_request_threaded_irq(&client->dev,client->irq, NULL, rx8010_irq, IRQF_TRIGGER_LOW | IRQF_ONESHOT,"rx8010", client);
if (err) {
dev_err(&client->dev, "unable to request IRQ\n");
goto errout_reg;
}
}
rx8010->rtc->irq_freq = 1;
rx8010->rtc->max_user_freq = 1;
return 0;
errout_reg:
rtc_device_unregister(rx8010->rtc);
errout_free:
kfree(rx8010);
errout:
dev_err(&adapter->dev, "probing for rx8010 failed\n");
return err;
}
houyizi313 2016-09-08
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楼主怎么解决的？我也遇到了这个问题！
colwer 2015-12-25
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或者，我在drivers/staging/android/alarm-dev.c中，能获取到驱动的i2c dev吗？想把rv = rtc_set_time(rtc_dev中的rtc_dev换成i2c的，该怎么写呢？
