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ACPI: TAD: Add RTC class device interface

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Add an RTC class device interface allowing to read and set the real time
value to the ACPI TAD driver.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://patch.msgid.link/2352027.iZASKD2KPV@rafael.j.wysocki
This commit is contained in:
Rafael J. Wysocki 2026-03-04 19:16:01 +01:00
parent fca4f233a2
commit 8a1e7f4b17
1 changed files with 76 additions and 2 deletions
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78
drivers/acpi/acpi_tad.c
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@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/rtc.h>
#include <linux/suspend.h>
MODULE_DESCRIPTION("ACPI Time and Alarm (TAD) Device Driver");
@ -51,6 +52,7 @@ MODULE_AUTHOR("Rafael J. Wysocki");
/* ACPI TAD RTC */
#define ACPI_TAD_TZ_UNSPEC 2047
#define ACPI_TAD_TIME_ISDST 3
struct acpi_tad_driver_data {
u32 capabilities;
@ -164,6 +166,8 @@ static int acpi_tad_get_real_time(struct device *dev, struct acpi_tad_rt *rt)
return 0;
}
/* sysfs interface */
static char *acpi_tad_rt_next_field(char *s, int *val)
{
char *p;
@ -579,6 +583,71 @@ static const struct attribute_group acpi_tad_attr_group = {
.is_visible = acpi_tad_attr_is_visible,
};
#ifdef CONFIG_RTC_CLASS
/* RTC class device interface */
static int acpi_tad_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct acpi_tad_rt rt;
rt.year = tm->tm_year + 1900;
rt.month = tm->tm_mon + 1;
rt.day = tm->tm_mday;
rt.hour = tm->tm_hour;
rt.minute = tm->tm_min;
rt.second = tm->tm_sec;
rt.tz = ACPI_TAD_TZ_UNSPEC;
rt.daylight = ACPI_TAD_TIME_ISDST * !!tm->tm_isdst;
return acpi_tad_set_real_time(dev, &rt);
}
static int acpi_tad_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct acpi_tad_rt rt;
int ret;
ret = acpi_tad_get_real_time(dev, &rt);
if (ret)
return ret;
tm->tm_year = rt.year - 1900;
tm->tm_mon = rt.month - 1;
tm->tm_mday = rt.day;
tm->tm_hour = rt.hour;
tm->tm_min = rt.minute;
tm->tm_sec = rt.second;
tm->tm_isdst = rt.daylight == ACPI_TAD_TIME_ISDST;
return 0;
}
static const struct rtc_class_ops acpi_tad_rtc_ops = {
.read_time = acpi_tad_rtc_read_time,
.set_time = acpi_tad_rtc_set_time,
};
static void acpi_tad_register_rtc(struct device *dev)
{
struct rtc_device *rtc;
rtc = devm_rtc_allocate_device(dev);
if (IS_ERR(rtc))
return;
rtc->range_min = mktime64(1900, 1, 1, 0, 0, 0);
rtc->range_max = mktime64(9999, 12, 31, 23, 59, 59);
rtc->ops = &acpi_tad_rtc_ops;
devm_rtc_register_device(rtc);
}
#else /* !CONFIG_RTC_CLASS */
static inline void acpi_tad_register_rtc(struct device *dev) {}
#endif /* !CONFIG_RTC_CLASS */
/* Platform driver interface */
static int acpi_tad_disable_timer(struct device *dev, u32 timer_id)
{
return acpi_tad_wake_set(dev, "_STV", timer_id, ACPI_TAD_WAKE_DISABLED);
@ -660,10 +729,15 @@ static int acpi_tad_probe(struct platform_device *pdev)
pm_runtime_suspend(dev);
ret = sysfs_create_group(&dev->kobj, &acpi_tad_attr_group);
if (ret)
if (ret) {
acpi_tad_remove(pdev);
return ret;
}
return ret;
if (caps & ACPI_TAD_RT)
acpi_tad_register_rtc(dev);
return 0;
}
static const struct acpi_device_id acpi_tad_ids[] = {