[mirror_ubuntu-eoan-kernel.git] / include / linux / rtc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Generic RTC interface.
 * This version contains the part of the user interface to the Real Time Clock
 * service. It is used with both the legacy mc146818 and also  EFI
 * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
 * from <linux/mc146818rtc.h> to this file for 2.4 kernels.
 *
 * Copyright (C) 1999 Hewlett-Packard Co.
 * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
 */
#ifndef _LINUX_RTC_H_
#define _LINUX_RTC_H_


#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/nvmem-provider.h>
#include <uapi/linux/rtc.h>

extern int rtc_month_days(unsigned int month, unsigned int year);
extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
ktime_t rtc_tm_to_ktime(struct rtc_time tm);
struct rtc_time rtc_ktime_to_tm(ktime_t kt);

/*
 * rtc_tm_sub - Return the difference in seconds.
 */
static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
{
	return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
}

static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
{
	rtc_time64_to_tm(time, tm);
}

static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
{
	*time = rtc_tm_to_time64(tm);

	return 0;
}

#include <linux/device.h>
#include <linux/seq_file.h>
#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/timerqueue.h>
#include <linux/workqueue.h>

extern struct class *rtc_class;

/*
 * For these RTC methods the device parameter is the physical device
 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
 * was passed to rtc_device_register().  Its driver_data normally holds
 * device state, including the rtc_device pointer for the RTC.
 *
 * Most of these methods are called with rtc_device.ops_lock held,
 * through the rtc_*(struct rtc_device *, ...) calls.
 *
 * The (current) exceptions are mostly filesystem hooks:
 *   - the proc() hook for procfs
 *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
 *
 * REVISIT those periodic irq calls *do* have ops_lock when they're
 * issued through ioctl() ...
 */
struct rtc_class_ops {
	int (*ioctl)(struct device *, unsigned int, unsigned long);
	int (*read_time)(struct device *, struct rtc_time *);
	int (*set_time)(struct device *, struct rtc_time *);
	int (*read_alarm)(struct device *, struct rtc_wkalrm *);
	int (*set_alarm)(struct device *, struct rtc_wkalrm *);
	int (*proc)(struct device *, struct seq_file *);
	int (*set_mmss64)(struct device *, time64_t secs);
	int (*set_mmss)(struct device *, unsigned long secs);
	int (*read_callback)(struct device *, int data);
	int (*alarm_irq_enable)(struct device *, unsigned int enabled);
	int (*read_offset)(struct device *, long *offset);
	int (*set_offset)(struct device *, long offset);
};

struct rtc_timer {
	struct timerqueue_node node;
	ktime_t period;
	void (*func)(void *private_data);
	void *private_data;
	int enabled;
};


/* flags */
#define RTC_DEV_BUSY 0

struct rtc_device {
	struct device dev;
	struct module *owner;

	int id;

	const struct rtc_class_ops *ops;
	struct mutex ops_lock;

	struct cdev char_dev;
	unsigned long flags;

	unsigned long irq_data;
	spinlock_t irq_lock;
	wait_queue_head_t irq_queue;
	struct fasync_struct *async_queue;

	int irq_freq;
	int max_user_freq;

	struct timerqueue_head timerqueue;
	struct rtc_timer aie_timer;
	struct rtc_timer uie_rtctimer;
	struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
	int pie_enabled;
	struct work_struct irqwork;
	/* Some hardware can't support UIE mode */
	int uie_unsupported;

	/* Number of nsec it takes to set the RTC clock. This influences when
	 * the set ops are called. An offset:
	 *   - of 0.5 s will call RTC set for wall clock time 10.0 s at 9.5 s
	 *   - of 1.5 s will call RTC set for wall clock time 10.0 s at 8.5 s
	 *   - of -0.5 s will call RTC set for wall clock time 10.0 s at 10.5 s
	 */
	long set_offset_nsec;

	bool registered;

	struct nvmem_device *nvmem;
	/* Old ABI support */
	bool nvram_old_abi;
	struct bin_attribute *nvram;

	time64_t range_min;
	timeu64_t range_max;
	time64_t start_secs;
	time64_t offset_secs;
	bool set_start_time;

#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
	struct work_struct uie_task;
	struct timer_list uie_timer;
	/* Those fields are protected by rtc->irq_lock */
	unsigned int oldsecs;
	unsigned int uie_irq_active:1;
	unsigned int stop_uie_polling:1;
	unsigned int uie_task_active:1;
	unsigned int uie_timer_active:1;
#endif
};
#define to_rtc_device(d) container_of(d, struct rtc_device, dev)

/* useful timestamps */
#define RTC_TIMESTAMP_BEGIN_1900	-2208989361LL /* 1900-01-01 00:00:00 */
#define RTC_TIMESTAMP_BEGIN_2000	946684800LL /* 2000-01-01 00:00:00 */
#define RTC_TIMESTAMP_END_2099		4102444799LL /* 2099-12-31 23:59:59 */

extern struct rtc_device *devm_rtc_device_register(struct device *dev,
					const char *name,
					const struct rtc_class_ops *ops,
					struct module *owner);
struct rtc_device *devm_rtc_allocate_device(struct device *dev);
int __rtc_register_device(struct module *owner, struct rtc_device *rtc);
extern void devm_rtc_device_unregister(struct device *dev,
					struct rtc_device *rtc);

extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_ntp_time(struct timespec64 now, unsigned long *target_nsec);
int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
extern int rtc_read_alarm(struct rtc_device *rtc,
			struct rtc_wkalrm *alrm);
extern int rtc_set_alarm(struct rtc_device *rtc,
				struct rtc_wkalrm *alrm);
extern int rtc_initialize_alarm(struct rtc_device *rtc,
				struct rtc_wkalrm *alrm);
extern void rtc_update_irq(struct rtc_device *rtc,
			unsigned long num, unsigned long events);

extern struct rtc_device *rtc_class_open(const char *name);
extern void rtc_class_close(struct rtc_device *rtc);

extern int rtc_irq_set_state(struct rtc_device *rtc, int enabled);
extern int rtc_irq_set_freq(struct rtc_device *rtc, int freq);
extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
						unsigned int enabled);

void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
void rtc_aie_update_irq(void *private);
void rtc_uie_update_irq(void *private);
enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);

void rtc_timer_init(struct rtc_timer *timer, void (*f)(void *p), void *data);
int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
		    ktime_t expires, ktime_t period);
void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
int rtc_read_offset(struct rtc_device *rtc, long *offset);
int rtc_set_offset(struct rtc_device *rtc, long offset);
void rtc_timer_do_work(struct work_struct *work);

static inline bool is_leap_year(unsigned int year)
{
	return (!(year % 4) && (year % 100)) || !(year % 400);
}

/* Determine if we can call to driver to set the time. Drivers can only be
 * called to set a second aligned time value, and the field set_offset_nsec
 * specifies how far away from the second aligned time to call the driver.
 *
 * This also computes 'to_set' which is the time we are trying to set, and has
 * a zero in tv_nsecs, such that:
 *    to_set - set_delay_nsec == now +/- FUZZ
 *
 */
static inline bool rtc_tv_nsec_ok(s64 set_offset_nsec,
				  struct timespec64 *to_set,
				  const struct timespec64 *now)
{
	/* Allowed error in tv_nsec, arbitarily set to 5 jiffies in ns. */
	const unsigned long TIME_SET_NSEC_FUZZ = TICK_NSEC * 5;
	struct timespec64 delay = {.tv_sec = 0,
				   .tv_nsec = set_offset_nsec};

	*to_set = timespec64_add(*now, delay);

	if (to_set->tv_nsec < TIME_SET_NSEC_FUZZ) {
		to_set->tv_nsec = 0;
		return true;
	}

	if (to_set->tv_nsec > NSEC_PER_SEC - TIME_SET_NSEC_FUZZ) {
		to_set->tv_sec++;
		to_set->tv_nsec = 0;
		return true;
	}
	return false;
}

#define rtc_register_device(device) \
	__rtc_register_device(THIS_MODULE, device)

#ifdef CONFIG_RTC_HCTOSYS_DEVICE
extern int rtc_hctosys_ret;
#else
#define rtc_hctosys_ret -ENODEV
#endif

#ifdef CONFIG_RTC_NVMEM
int rtc_nvmem_register(struct rtc_device *rtc,
		       struct nvmem_config *nvmem_config);
void rtc_nvmem_unregister(struct rtc_device *rtc);
#else
static inline int rtc_nvmem_register(struct rtc_device *rtc,
				     struct nvmem_config *nvmem_config)
{
	return 0;
}
static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}
#endif

#ifdef CONFIG_RTC_INTF_SYSFS
int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp);
int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps);
#else
static inline
int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
{
	return 0;
}

static inline
int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
{
	return 0;
}
#endif
#endif /* _LINUX_RTC_H_ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/*
	3	* Generic RTC interface.
	4	* This version contains the part of the user interface to the Real Time Clock
	5	* service. It is used with both the legacy mc146818 and also EFI
	6	* Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
	7	* from <linux/mc146818rtc.h> to this file for 2.4 kernels.
ab6a2d70	8	*
1da177e4 LT	9	* Copyright (C) 1999 Hewlett-Packard Co.
	10	* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
	11	*/
	12	#ifndef _LINUX_RTC_H_
	13	#define _LINUX_RTC_H_
	14
1da177e4	15
78d89ef4	16	#include <linux/types.h>
4024ce5e	17	#include <linux/interrupt.h>
697e5a47	18	#include <linux/nvmem-provider.h>
607ca46e	19	#include <uapi/linux/rtc.h>
4024ce5e	20
c58411e9	21	extern int rtc_month_days(unsigned int month, unsigned int year);
8232212e	22	extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
c58411e9	23	extern int rtc_valid_tm(struct rtc_time *tm);
c2c11ae4	24	extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
c2c11ae4	25	extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
6610e089 JS	26	ktime_t rtc_tm_to_ktime(struct rtc_time tm);
	27	struct rtc_time rtc_ktime_to_tm(ktime_t kt);
	28
92000257 XP	29	/*
	30	* rtc_tm_sub - Return the difference in seconds.
	31	*/
	32	static inline time64_t rtc_tm_sub(struct rtc_time lhs, struct rtc_time rhs)
	33	{
	34	return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
	35	}
	36
c2c11ae4	37	static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
	38	{
	39	rtc_time64_to_tm(time, tm);
	40	}
	41
c2c11ae4	42	static inline int rtc_tm_to_time(struct rtc_time tm, unsigned long time)
	43	{
	44	*time = rtc_tm_to_time64(tm);
	45
	46	return 0;
	47	}
c58411e9	48
0c86edc0 AZ	49	#include <linux/device.h>
	50	#include <linux/seq_file.h>
	51	#include <linux/cdev.h>
	52	#include <linux/poll.h>
	53	#include <linux/mutex.h>
6610e089 JS	54	#include <linux/timerqueue.h>
6610e089 JS	55	#include <linux/workqueue.h>
0c86edc0 AZ	56
	57	extern struct class *rtc_class;
	58
5ad31a57 DB	59	/*
	60	* For these RTC methods the device parameter is the physical device
	61	* on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
	62	* was passed to rtc_device_register(). Its driver_data normally holds
	63	* device state, including the rtc_device pointer for the RTC.
	64	*
	65	* Most of these methods are called with rtc_device.ops_lock held,
	66	* through the rtc_(struct rtc_device , ...) calls.
	67	*
	68	* The (current) exceptions are mostly filesystem hooks:
	69	* - the proc() hook for procfs
	70	* - non-ioctl() chardev hooks: open(), release(), read_callback()
5ad31a57 DB	71	*
	72	* REVISIT those periodic irq calls do have ops_lock when they're
	73	* issued through ioctl() ...
	74	*/
0c86edc0	75	struct rtc_class_ops {
0c86edc0 AZ	76	int (ioctl)(struct device , unsigned int, unsigned long);
	77	int (read_time)(struct device , struct rtc_time *);
	78	int (set_time)(struct device , struct rtc_time *);
	79	int (read_alarm)(struct device , struct rtc_wkalrm *);
	80	int (set_alarm)(struct device , struct rtc_wkalrm *);
	81	int (proc)(struct device , struct seq_file *);
8e4ff1a8	82	int (set_mmss64)(struct device , time64_t secs);
0c86edc0	83	int (set_mmss)(struct device , unsigned long secs);
0c86edc0	84	int (read_callback)(struct device , int data);
099e6576	85	int (alarm_irq_enable)(struct device , unsigned int enabled);
b3967067 JC	86	int (read_offset)(struct device , long *offset);
b3967067 JC	87	int (set_offset)(struct device , long offset);
0c86edc0 AZ	88	};
0c86edc0 AZ	89
6610e089	90	struct rtc_timer {
6610e089 JS	91	struct timerqueue_node node;
6610e089 JS	92	ktime_t period;
5a5ba10f AB	93	void (func)(void private_data);
5a5ba10f AB	94	void *private_data;
6610e089 JS	95	int enabled;
	96	};
	97
0c86edc0	98
8853c202 JK	99	/* flags */
	100	#define RTC_DEV_BUSY 0
	101
1796dcce	102	struct rtc_device {
cd966209	103	struct device dev;
0c86edc0 AZ	104	struct module *owner;
	105
	106	int id;
0c86edc0	107
ff8371ac	108	const struct rtc_class_ops *ops;
0c86edc0 AZ	109	struct mutex ops_lock;
0c86edc0 AZ	110
0c86edc0	111	struct cdev char_dev;
8853c202	112	unsigned long flags;
0c86edc0 AZ	113
	114	unsigned long irq_data;
	115	spinlock_t irq_lock;
	116	wait_queue_head_t irq_queue;
	117	struct fasync_struct *async_queue;
	118
0c86edc0	119	int irq_freq;
110d693d	120	int max_user_freq;
6610e089 JS	121
	122	struct timerqueue_head timerqueue;
	123	struct rtc_timer aie_timer;
	124	struct rtc_timer uie_rtctimer;
	125	struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
	126	int pie_enabled;
	127	struct work_struct irqwork;
4a649903 JS	128	/* Some hardware can't support UIE mode */
4a649903 JS	129	int uie_unsupported;
6e57b1d6	130
0f295b06 JG	131	/* Number of nsec it takes to set the RTC clock. This influences when
	132	* the set ops are called. An offset:
	133	* - of 0.5 s will call RTC set for wall clock time 10.0 s at 9.5 s
	134	* - of 1.5 s will call RTC set for wall clock time 10.0 s at 8.5 s
	135	* - of -0.5 s will call RTC set for wall clock time 10.0 s at 10.5 s
	136	*/
	137	long set_offset_nsec;
	138
3068a254 AB	139	bool registered;
3068a254 AB	140
697e5a47 AB	141	struct nvmem_device *nvmem;
	142	/* Old ABI support */
	143	bool nvram_old_abi;
	144	struct bin_attribute *nvram;
	145
71db049e AB	146	time64_t range_min;
71db049e AB	147	timeu64_t range_max;
98951564 BW	148	time64_t start_secs;
	149	time64_t offset_secs;
	150	bool set_start_time;
71db049e	151
6e57b1d6 JS	152	#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
	153	struct work_struct uie_task;
	154	struct timer_list uie_timer;
	155	/* Those fields are protected by rtc->irq_lock */
	156	unsigned int oldsecs;
	157	unsigned int uie_irq_active:1;
	158	unsigned int stop_uie_polling:1;
	159	unsigned int uie_task_active:1;
	160	unsigned int uie_timer_active:1;
	161	#endif
0c86edc0	162	};
cd966209	163	#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
0c86edc0	164
83bbc5ac AB	165	/* useful timestamps */
	166	#define RTC_TIMESTAMP_BEGIN_1900 -2208989361LL /* 1900-01-01 00:00:00 */
	167	#define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */
	168	#define RTC_TIMESTAMP_END_2099 4102444799LL /* 2099-12-31 23:59:59 */
	169
6636a994 JH	170	extern struct rtc_device devm_rtc_device_register(struct device dev,
6636a994 JH	171	const char *name,
3e217b66 JH	172	const struct rtc_class_ops *ops,
3e217b66 JH	173	struct module *owner);
3068a254 AB	174	struct rtc_device devm_rtc_allocate_device(struct device dev);
3068a254 AB	175	int __rtc_register_device(struct module owner, struct rtc_device rtc);
3e217b66 JH	176	extern void devm_rtc_device_unregister(struct device *dev,
3e217b66 JH	177	struct rtc_device *rtc);
0c86edc0	178
ab6a2d70 DB	179	extern int rtc_read_time(struct rtc_device rtc, struct rtc_time tm);
ab6a2d70 DB	180	extern int rtc_set_time(struct rtc_device rtc, struct rtc_time tm);
0f295b06	181	extern int rtc_set_ntp_time(struct timespec64 now, unsigned long *target_nsec);
f44f7f96	182	int __rtc_read_alarm(struct rtc_device rtc, struct rtc_wkalrm alarm);
ab6a2d70	183	extern int rtc_read_alarm(struct rtc_device *rtc,
0c86edc0	184	struct rtc_wkalrm *alrm);
ab6a2d70	185	extern int rtc_set_alarm(struct rtc_device *rtc,
0c86edc0	186	struct rtc_wkalrm *alrm);
f6d5b331 JS	187	extern int rtc_initialize_alarm(struct rtc_device *rtc,
f6d5b331 JS	188	struct rtc_wkalrm *alrm);
ab6a2d70	189	extern void rtc_update_irq(struct rtc_device *rtc,
0c86edc0 AZ	190	unsigned long num, unsigned long events);
0c86edc0 AZ	191
9f3b795a	192	extern struct rtc_device rtc_class_open(const char name);
ab6a2d70	193	extern void rtc_class_close(struct rtc_device *rtc);
0c86edc0	194
8719d3c9 AB	195	extern int rtc_irq_set_state(struct rtc_device *rtc, int enabled);
8719d3c9 AB	196	extern int rtc_irq_set_freq(struct rtc_device *rtc, int freq);
099e6576 AZ	197	extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
099e6576 AZ	198	extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
6e57b1d6 JS	199	extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
6e57b1d6 JS	200	unsigned int enabled);
0c86edc0	201
456d66ec	202	void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
6610e089 JS	203	void rtc_aie_update_irq(void *private);
	204	void rtc_uie_update_irq(void *private);
	205	enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
1da177e4	206
1796dcce KK	207	void rtc_timer_init(struct rtc_timer timer, void (f)(void p), void data);
	208	int rtc_timer_start(struct rtc_device rtc, struct rtc_timer timer,
	209	ktime_t expires, ktime_t period);
73744a64	210	void rtc_timer_cancel(struct rtc_device rtc, struct rtc_timer timer);
b3967067 JC	211	int rtc_read_offset(struct rtc_device rtc, long offset);
b3967067 JC	212	int rtc_set_offset(struct rtc_device *rtc, long offset);
96c8f06a	213	void rtc_timer_do_work(struct work_struct *work);
6610e089	214
78d89ef4 AM	215	static inline bool is_leap_year(unsigned int year)
	216	{
	217	return (!(year % 4) && (year % 100)) \|\| !(year % 400);
	218	}
	219
0f295b06 JG	220	/* Determine if we can call to driver to set the time. Drivers can only be
	221	* called to set a second aligned time value, and the field set_offset_nsec
	222	* specifies how far away from the second aligned time to call the driver.
	223	*
	224	* This also computes 'to_set' which is the time we are trying to set, and has
	225	* a zero in tv_nsecs, such that:
	226	* to_set - set_delay_nsec == now +/- FUZZ
	227	*
	228	*/
	229	static inline bool rtc_tv_nsec_ok(s64 set_offset_nsec,
	230	struct timespec64 *to_set,
	231	const struct timespec64 *now)
	232	{
	233	/* Allowed error in tv_nsec, arbitarily set to 5 jiffies in ns. */
	234	const unsigned long TIME_SET_NSEC_FUZZ = TICK_NSEC * 5;
	235	struct timespec64 delay = {.tv_sec = 0,
	236	.tv_nsec = set_offset_nsec};
	237
	238	to_set = timespec64_add(now, delay);
	239
	240	if (to_set->tv_nsec < TIME_SET_NSEC_FUZZ) {
	241	to_set->tv_nsec = 0;
	242	return true;
	243	}
	244
	245	if (to_set->tv_nsec > NSEC_PER_SEC - TIME_SET_NSEC_FUZZ) {
	246	to_set->tv_sec++;
	247	to_set->tv_nsec = 0;
	248	return true;
	249	}
	250	return false;
	251	}
	252
3068a254 AB	253	#define rtc_register_device(device) \
	254	__rtc_register_device(THIS_MODULE, device)
	255
4c24e29e	256	#ifdef CONFIG_RTC_HCTOSYS_DEVICE
d0ab4a4d UKK	257	extern int rtc_hctosys_ret;
	258	#else
	259	#define rtc_hctosys_ret -ENODEV
	260	#endif
	261
fd5cd21d AB	262	#ifdef CONFIG_RTC_NVMEM
	263	int rtc_nvmem_register(struct rtc_device *rtc,
	264	struct nvmem_config *nvmem_config);
	265	void rtc_nvmem_unregister(struct rtc_device *rtc);
	266	#else
	267	static inline int rtc_nvmem_register(struct rtc_device *rtc,
	268	struct nvmem_config *nvmem_config)
	269	{
c59b3715	270	return 0;
fd5cd21d AB	271	}
	272	static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}
	273	#endif
	274
eb2bccb7 AB	275	#ifdef CONFIG_RTC_INTF_SYSFS
	276	int rtc_add_group(struct rtc_device rtc, const struct attribute_group grp);
	277	int rtc_add_groups(struct rtc_device rtc, const struct attribute_group *grps);
	278	#else
	279	static inline
	280	int rtc_add_group(struct rtc_device rtc, const struct attribute_group grp)
	281	{
	282	return 0;
	283	}
	284
	285	static inline
	286	int rtc_add_groups(struct rtc_device rtc, const struct attribute_group *grps)
	287	{
	288	return 0;
	289	}
	290	#endif
1da177e4	291	#endif /* _LINUX_RTC_H_ */