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Subject[PATCH] char: rtc: remove unused rtc_control() API
Date
Since commit 34ce71a96dcb ("ALSA: timer: remove legacy rtctimer"), the
rtc_register/rtc_control/rtc_unregister API is unused. As it is highly
unlikely to be needed again, remove it.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---

Hi,

I'd like that one to go through the RTC tree as I have other changes in rtc.h
planned for the next release.

drivers/char/rtc.c | 83 -----------------------------------------------------
include/linux/rtc.h | 4 ---
2 files changed, 87 deletions(-)

diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index c6a317120a55..3d86115e5624 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -809,89 +809,6 @@ static __poll_t rtc_poll(struct file *file, poll_table *wait)
}
#endif

-int rtc_register(rtc_task_t *task)
-{
-#ifndef RTC_IRQ
- return -EIO;
-#else
- if (task == NULL || task->func == NULL)
- return -EINVAL;
- spin_lock_irq(&rtc_lock);
- if (rtc_status & RTC_IS_OPEN) {
- spin_unlock_irq(&rtc_lock);
- return -EBUSY;
- }
- spin_lock(&rtc_task_lock);
- if (rtc_callback) {
- spin_unlock(&rtc_task_lock);
- spin_unlock_irq(&rtc_lock);
- return -EBUSY;
- }
- rtc_status |= RTC_IS_OPEN;
- rtc_callback = task;
- spin_unlock(&rtc_task_lock);
- spin_unlock_irq(&rtc_lock);
- return 0;
-#endif
-}
-EXPORT_SYMBOL(rtc_register);
-
-int rtc_unregister(rtc_task_t *task)
-{
-#ifndef RTC_IRQ
- return -EIO;
-#else
- unsigned char tmp;
-
- spin_lock_irq(&rtc_lock);
- spin_lock(&rtc_task_lock);
- if (rtc_callback != task) {
- spin_unlock(&rtc_task_lock);
- spin_unlock_irq(&rtc_lock);
- return -ENXIO;
- }
- rtc_callback = NULL;
-
- /* disable controls */
- if (!hpet_mask_rtc_irq_bit(RTC_PIE | RTC_AIE | RTC_UIE)) {
- tmp = CMOS_READ(RTC_CONTROL);
- tmp &= ~RTC_PIE;
- tmp &= ~RTC_AIE;
- tmp &= ~RTC_UIE;
- CMOS_WRITE(tmp, RTC_CONTROL);
- CMOS_READ(RTC_INTR_FLAGS);
- }
- if (rtc_status & RTC_TIMER_ON) {
- rtc_status &= ~RTC_TIMER_ON;
- del_timer(&rtc_irq_timer);
- }
- rtc_status &= ~RTC_IS_OPEN;
- spin_unlock(&rtc_task_lock);
- spin_unlock_irq(&rtc_lock);
- return 0;
-#endif
-}
-EXPORT_SYMBOL(rtc_unregister);
-
-int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg)
-{
-#ifndef RTC_IRQ
- return -EIO;
-#else
- unsigned long flags;
- if (cmd != RTC_PIE_ON && cmd != RTC_PIE_OFF && cmd != RTC_IRQP_SET)
- return -EINVAL;
- spin_lock_irqsave(&rtc_task_lock, flags);
- if (rtc_callback != task) {
- spin_unlock_irqrestore(&rtc_task_lock, flags);
- return -ENXIO;
- }
- spin_unlock_irqrestore(&rtc_task_lock, flags);
- return rtc_do_ioctl(cmd, arg, 1);
-#endif
-}
-EXPORT_SYMBOL(rtc_control);
-
/*
* The various file operations we support.
*/
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index fc6c90b57be0..5024b61119b6 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -212,10 +212,6 @@ void rtc_aie_update_irq(void *private);
void rtc_uie_update_irq(void *private);
enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);

-int rtc_register(rtc_task_t *task);
-int rtc_unregister(rtc_task_t *task);
-int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
-
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);
--
2.15.1
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