Commit 8a1e7f4b authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI: TAD: Add RTC class device interface 



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

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://patch.msgid.link/2352027.iZASKD2KPV@rafael.j.wysocki
parent fca4f233

drivers/acpi/acpi_tad.c

+76 −2
Original line number Diff line number Diff line
@@ -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);
@@ -660,12 +729,17 @@ 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;

	}



	if (caps & ACPI_TAD_RT)

		acpi_tad_register_rtc(dev);



	return 0;

}



static const struct acpi_device_id acpi_tad_ids[] = {

	{"ACPI000E", 0},

	{}