From 6e57b1d6a8d8ed1998229b71c102be1997e397c6 Mon Sep 17 00:00:00 2001 From: John Stultz Date: Fri, 11 Feb 2011 17:45:40 -0800 Subject: RTC: Revert UIE emulation removal MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Uwe pointed out that my alarm based UIE emulation is not sufficient to replace the older timer/polling based UIE emulation on devices where there is no alarm irq. This causes rtc devices without alarms to return -EINVAL to UIE ioctls. The fix is to re-instate the old timer/polling method for devices without alarm irqs. This patch reverts the following commits: 042620a018afcfba1d678062b62e46 - Remove UIE emulation 1daeddd5962acad1bea55e524fc0fa - Cleanup removed UIE emulation declaration b5cc8ca1c9c3a37eaddf709b2fd3e1 - Remove Kconfig symbol for UIE emulation The emulation mode will still need to be wired-in with a following patch before it will work. CC: Uwe Kleine-König CC: Thomas Gleixner Reported-by: Uwe Kleine-König Signed-off-by: John Stultz --- include/linux/rtc.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'include') diff --git a/include/linux/rtc.h b/include/linux/rtc.h index a0b639f8e80..80408e711be 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -203,6 +203,18 @@ struct rtc_device struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */ int pie_enabled; struct work_struct irqwork; + + +#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) @@ -235,6 +247,8 @@ extern int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, 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_aie_update_irq(void *private); void rtc_uie_update_irq(void *private); -- cgit v1.2.3-70-g09d2 From 456d66ecd09e3bc326b93174745faafb6ac378d6 Mon Sep 17 00:00:00 2001 From: John Stultz Date: Fri, 11 Feb 2011 18:15:23 -0800 Subject: RTC: Re-enable UIE timer/polling emulation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch re-enables UIE timer/polling emulation for rtc devices that do not support alarm irqs. CC: Uwe Kleine-König CC: Thomas Gleixner Reported-by: Uwe Kleine-König Tested-by: Uwe Kleine-König Signed-off-by: John Stultz --- drivers/rtc/interface.c | 18 +++++++++++++++++- drivers/rtc/rtc-dev.c | 2 +- include/linux/rtc.h | 1 + 3 files changed, 19 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 413ae053791..cb2f0728fd7 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -228,6 +228,12 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) if (err) return err; +#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL + if (enabled == 0 && rtc->uie_irq_active) { + mutex_unlock(&rtc->ops_lock); + return rtc_dev_update_irq_enable_emul(rtc, 0); + } +#endif /* make sure we're changing state */ if (rtc->uie_rtctimer.enabled == enabled) goto out; @@ -247,6 +253,16 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) out: mutex_unlock(&rtc->ops_lock); +#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL + /* + * Enable emulation if the driver did not provide + * the update_irq_enable function pointer or if returned + * -EINVAL to signal that it has been configured without + * interrupts or that are not available at the moment. + */ + if (err == -EINVAL) + err = rtc_dev_update_irq_enable_emul(rtc, enabled); +#endif return err; } @@ -262,7 +278,7 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable); * * Triggers the registered irq_task function callback. */ -static void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode) +void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode) { unsigned long flags; diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index dfa72c9c268..d0e06edb14c 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -76,7 +76,7 @@ static void rtc_uie_task(struct work_struct *work) } spin_unlock_irq(&rtc->irq_lock); if (num) - rtc_update_irq(rtc, num, RTC_UF | RTC_IRQF); + rtc_handle_legacy_irq(rtc, num, RTC_UF); } static void rtc_uie_timer(unsigned long data) { diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 80408e711be..89c3e518299 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -250,6 +250,7 @@ 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); -- cgit v1.2.3-70-g09d2