mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Bartosz Golaszewski](/assets/img/avatar_default.png)
rtc_register_device() is a managed interface but it doesn't use devres by itself - instead it marks an rtc_device as "registered" and the devres callback for devm_rtc_allocate_device() takes care of resource release. This doesn't correspond with the design behind devres where managed structures should not be aware of being managed. The correct solution here is to register a separate devres callback for unregistering the device. While at it: rename rtc_register_device() to devm_rtc_register_device() and add it to the list of managed interfaces in devres.rst. This way we can avoid any potential confusion of driver developers who may expect there to exist a corresponding unregister function. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20201109163409.24301-8-brgl@bgdev.pl
150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2019 BayLibre, SAS
|
|
* Author: Neil Armstrong <narmstrong@baylibre.com>
|
|
* Copyright (C) 2015 Amlogic, Inc. All rights reserved.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/time64.h>
|
|
|
|
struct meson_vrtc_data {
|
|
void __iomem *io_alarm;
|
|
struct rtc_device *rtc;
|
|
unsigned long alarm_time;
|
|
bool enabled;
|
|
};
|
|
|
|
static int meson_vrtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct timespec64 time;
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
ktime_get_raw_ts64(&time);
|
|
rtc_time64_to_tm(time.tv_sec, tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void meson_vrtc_set_wakeup_time(struct meson_vrtc_data *vrtc,
|
|
unsigned long time)
|
|
{
|
|
writel_relaxed(time, vrtc->io_alarm);
|
|
}
|
|
|
|
static int meson_vrtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
{
|
|
struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
|
|
|
|
dev_dbg(dev, "%s: alarm->enabled=%d\n", __func__, alarm->enabled);
|
|
if (alarm->enabled)
|
|
vrtc->alarm_time = rtc_tm_to_time64(&alarm->time);
|
|
else
|
|
vrtc->alarm_time = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int meson_vrtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
|
|
|
|
vrtc->enabled = enabled;
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops meson_vrtc_ops = {
|
|
.read_time = meson_vrtc_read_time,
|
|
.set_alarm = meson_vrtc_set_alarm,
|
|
.alarm_irq_enable = meson_vrtc_alarm_irq_enable,
|
|
};
|
|
|
|
static int meson_vrtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct meson_vrtc_data *vrtc;
|
|
|
|
vrtc = devm_kzalloc(&pdev->dev, sizeof(*vrtc), GFP_KERNEL);
|
|
if (!vrtc)
|
|
return -ENOMEM;
|
|
|
|
vrtc->io_alarm = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(vrtc->io_alarm))
|
|
return PTR_ERR(vrtc->io_alarm);
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
platform_set_drvdata(pdev, vrtc);
|
|
|
|
vrtc->rtc = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(vrtc->rtc))
|
|
return PTR_ERR(vrtc->rtc);
|
|
|
|
vrtc->rtc->ops = &meson_vrtc_ops;
|
|
return devm_rtc_register_device(vrtc->rtc);
|
|
}
|
|
|
|
static int __maybe_unused meson_vrtc_suspend(struct device *dev)
|
|
{
|
|
struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
if (vrtc->alarm_time) {
|
|
unsigned long local_time;
|
|
long alarm_secs;
|
|
struct timespec64 time;
|
|
|
|
ktime_get_raw_ts64(&time);
|
|
local_time = time.tv_sec;
|
|
|
|
dev_dbg(dev, "alarm_time = %lus, local_time=%lus\n",
|
|
vrtc->alarm_time, local_time);
|
|
alarm_secs = vrtc->alarm_time - local_time;
|
|
if (alarm_secs > 0) {
|
|
meson_vrtc_set_wakeup_time(vrtc, alarm_secs);
|
|
dev_dbg(dev, "system will wakeup in %lds.\n",
|
|
alarm_secs);
|
|
} else {
|
|
dev_err(dev, "alarm time already passed: %lds.\n",
|
|
alarm_secs);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused meson_vrtc_resume(struct device *dev)
|
|
{
|
|
struct meson_vrtc_data *vrtc = dev_get_drvdata(dev);
|
|
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
|
|
vrtc->alarm_time = 0;
|
|
meson_vrtc_set_wakeup_time(vrtc, 0);
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(meson_vrtc_pm_ops,
|
|
meson_vrtc_suspend, meson_vrtc_resume);
|
|
|
|
static const struct of_device_id meson_vrtc_dt_match[] = {
|
|
{ .compatible = "amlogic,meson-vrtc"},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, meson_vrtc_dt_match);
|
|
|
|
static struct platform_driver meson_vrtc_driver = {
|
|
.probe = meson_vrtc_probe,
|
|
.driver = {
|
|
.name = "meson-vrtc",
|
|
.of_match_table = meson_vrtc_dt_match,
|
|
.pm = &meson_vrtc_pm_ops,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(meson_vrtc_driver);
|
|
|
|
MODULE_DESCRIPTION("Amlogic Virtual Wakeup RTC Timer driver");
|
|
MODULE_LICENSE("GPL");
|