From 899be96db75451ba98cb217109ef4cf2ee6de927 Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Mon, 8 Nov 2010 13:35:10 +0800 Subject: rtc: rtc-sh - fix a memory leak request_mem_region() will call kzalloc to allocate memory for struct resource. release_resource() unregisters the resource but does not free the allocated memory, thus use release_mem_region() instead to fix the memory leak. Signed-off-by: Axel Lin Signed-off-by: Paul Mundt --- drivers/rtc/rtc-sh.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c index 5efbd5990ff8..06e41ed93230 100644 --- a/drivers/rtc/rtc-sh.c +++ b/drivers/rtc/rtc-sh.c @@ -761,7 +761,7 @@ err_unmap: clk_put(rtc->clk); iounmap(rtc->regbase); err_badmap: - release_resource(rtc->res); + release_mem_region(rtc->res->start, rtc->regsize); err_badres: kfree(rtc); @@ -786,7 +786,7 @@ static int __exit sh_rtc_remove(struct platform_device *pdev) } iounmap(rtc->regbase); - release_resource(rtc->res); + release_mem_region(rtc->res->start, rtc->regsize); clk_disable(rtc->clk); clk_put(rtc->clk); -- cgit v1.2.3 From a404ad1ff593589bdd34c48ebecddada9edbfaf3 Mon Sep 17 00:00:00 2001 From: Marcelo Roberto Jimenez Date: Mon, 18 Oct 2010 22:33:53 +0100 Subject: ARM: 6452/1: Fix checkpatch.pl issues in drivers/rtc/rtc-sa1100.c. This patch fixes checkpatch.pl issues in drivers/rtc/rtc-sa1100.c, which I will later modify. Signed-off-by: Marcelo Roberto Jimenez Signed-off-by: Russell King --- drivers/rtc/rtc-sa1100.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c index e4a44b641702..e19ed0f6dca0 100644 --- a/drivers/rtc/rtc-sa1100.c +++ b/drivers/rtc/rtc-sa1100.c @@ -39,7 +39,7 @@ #include #endif -#define RTC_DEF_DIVIDER 32768 - 1 +#define RTC_DEF_DIVIDER (32768 - 1) #define RTC_DEF_TRIM 0 static unsigned long rtc_freq = 1024; @@ -61,7 +61,8 @@ static inline int rtc_periodic_alarm(struct rtc_time *tm) * Calculate the next alarm time given the requested alarm time mask * and the current time. */ -static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc_time *alrm) +static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, + struct rtc_time *alrm) { unsigned long next_time; unsigned long now_time; @@ -178,7 +179,7 @@ static int sa1100_rtc_read_callback(struct device *dev, int data) * Here we compare (match - OSCR) 8 instead of 0 -- * see comment in pxa_timer_interrupt() for explanation. */ - while( (signed long)((osmr1 = OSMR1) - OSCR) <= 8 ) { + while ((signed long)((osmr1 = OSMR1) - OSCR) <= 8) { data += 0x100; OSSR = OSSR_M1; /* clear match on timer 1 */ OSMR1 = osmr1 + period; @@ -192,19 +193,19 @@ static int sa1100_rtc_open(struct device *dev) int ret; ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED, - "rtc 1Hz", dev); + "rtc 1Hz", dev); if (ret) { dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz); goto fail_ui; } ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, IRQF_DISABLED, - "rtc Alrm", dev); + "rtc Alrm", dev); if (ret) { dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm); goto fail_ai; } ret = request_irq(IRQ_OST1, timer1_interrupt, IRQF_DISABLED, - "rtc timer", dev); + "rtc timer", dev); if (ret) { dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1); goto fail_pi; @@ -236,7 +237,7 @@ static void sa1100_rtc_release(struct device *dev) static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { - switch(cmd) { + switch (cmd) { case RTC_AIE_OFF: spin_lock_irq(&sa1100_rtc_lock); RTSR &= ~RTSR_ALE; @@ -364,7 +365,8 @@ static int sa1100_rtc_probe(struct platform_device *pdev) */ if (RTTR == 0) { RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16); - dev_warn(&pdev->dev, "warning: initializing default clock divider/trim value\n"); + dev_warn(&pdev->dev, "warning: " + "initializing default clock divider/trim value\n"); /* The current RTC value probably doesn't make sense either */ RCNR = 0; } @@ -386,7 +388,7 @@ static int sa1100_rtc_remove(struct platform_device *pdev) { struct rtc_device *rtc = platform_get_drvdata(pdev); - if (rtc) + if (rtc) rtc_device_unregister(rtc); return 0; -- cgit v1.2.3 From fd3ee6d3421bc05ce42ee7f48071aee72051af28 Mon Sep 17 00:00:00 2001 From: Marcelo Roberto Jimenez Date: Mon, 18 Oct 2010 22:34:47 +0100 Subject: ARM: 6453/1: sa1100: Print the value of RTSR on /proc/drivers/rtc. This patch adds a line to the output of /proc/drivers/rtc to show the value of the RTSR register. It will be used to demonstrate a nasty initialization bug that will be fixed in the sequence. Signed-off-by: Marcelo Roberto Jimenez Signed-off-by: Russell King --- drivers/rtc/rtc-sa1100.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c index e19ed0f6dca0..b04c8374a279 100644 --- a/drivers/rtc/rtc-sa1100.c +++ b/drivers/rtc/rtc-sa1100.c @@ -334,6 +334,7 @@ static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq) seq_printf(seq, "periodic_IRQ\t: %s\n", (OIER & OIER_E1) ? "yes" : "no"); seq_printf(seq, "periodic_freq\t: %ld\n", rtc_freq); + seq_printf(seq, "RTSR\t\t: 0x%08x\n", (u32)RTSR); return 0; } -- cgit v1.2.3 From 7decaa557a20f48aabef35f817ec16ef563567b0 Mon Sep 17 00:00:00 2001 From: Marcelo Roberto Jimenez Date: Mon, 18 Oct 2010 22:35:54 +0100 Subject: ARM: 6454/1: sa1100: Fix for a nasty initialization bug in the RTSR. This patch fixes a nasty initialization condition on the RTSR register. Sometimes, bit 1 will wake up set, sometimes not. This can be seen by checking the value of the RTSR by typing '$ cat /proc/driver/rtc', which has been provided by the previous patch. If this bit is set, the command '$ cat /dev/rtc0' will lock the system in an endless interrupt routine calling loop. This patch fixes the issue both at sa1100_rtc_probe(), where it avoids a spurious interrupt from happening, and at sa1100_rtc_interrupt(), which is the robust solution, though it does not avoid the first spurious interrupt. Signed-off-by: Marcelo Roberto Jimenez Signed-off-by: Russell King --- drivers/rtc/rtc-sa1100.c | 42 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c index b04c8374a279..b0985f727078 100644 --- a/drivers/rtc/rtc-sa1100.c +++ b/drivers/rtc/rtc-sa1100.c @@ -117,7 +117,23 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id) rtsr = RTSR; /* clear interrupt sources */ RTSR = 0; - RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2); + /* Fix for a nasty initialization problem the in SA11xx RTSR register. + * See also the comments in sa1100_rtc_probe(). */ + if (rtsr & (RTSR_ALE | RTSR_HZE)) { + /* This is the original code, before there was the if test + * above. This code does not clear interrupts that were not + * enabled. */ + RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2); + } else { + /* For some reason, it is possible to enter this routine + * without interruptions enabled, it has been tested with + * several units (Bug in SA11xx chip?). + * + * This situation leads to an infinite "loop" of interrupt + * routine calling and as a result the processor seems to + * lock on its first call to open(). */ + RTSR = RTSR_AL | RTSR_HZ; + } /* clear alarm interrupt if it has occurred */ if (rtsr & RTSR_AL) @@ -382,6 +398,30 @@ static int sa1100_rtc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, rtc); + /* Fix for a nasty initialization problem the in SA11xx RTSR register. + * See also the comments in sa1100_rtc_interrupt(). + * + * Sometimes bit 1 of the RTSR (RTSR_HZ) will wake up 1, which means an + * interrupt pending, even though interrupts were never enabled. + * In this case, this bit it must be reset before enabling + * interruptions to avoid a nonexistent interrupt to occur. + * + * In principle, the same problem would apply to bit 0, although it has + * never been observed to happen. + * + * This issue is addressed both here and in sa1100_rtc_interrupt(). + * If the issue is not addressed here, in the times when the processor + * wakes up with the bit set there will be one spurious interrupt. + * + * The issue is also dealt with in sa1100_rtc_interrupt() to be on the + * safe side, once the condition that lead to this strange + * initialization is unknown and could in principle happen during + * normal processing. + * + * Notice that clearing bit 1 and 0 is accomplished by writting ONES to + * the corresponding bits in RTSR. */ + RTSR = RTSR_AL | RTSR_HZ; + return 0; } -- cgit v1.2.3 From 8cb7c71bda16e2d67a332642661e0b4219641a23 Mon Sep 17 00:00:00 2001 From: Srikanth Krishnakar Date: Thu, 14 Oct 2010 04:03:35 +0000 Subject: rtc-cmos.c : Fix warning on PowerPC The following warning is seen while compilation of PowerPC kernel: CC drivers/rtc/rtc-cmos.o drivers/rtc/rtc-cmos.c:697:2: warning: #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. Fix it by adding defined(__powerpc__). Signed-off-by: Srikanth Krishnakar Signed-off-by: Benjamin Herrenschmidt --- drivers/rtc/rtc-cmos.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index 5856167a0c90..7e6ce626b7f1 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -687,7 +687,8 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) #if defined(CONFIG_ATARI) address_space = 64; #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \ - || defined(__sparc__) || defined(__mips__) + || defined(__sparc__) || defined(__mips__) \ + || defined(__powerpc__) address_space = 128; #else #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. -- cgit v1.2.3 From 6610e0893b8bc6f59b14fed7f089c5997f035f88 Mon Sep 17 00:00:00 2001 From: John Stultz Date: Thu, 23 Sep 2010 15:07:34 -0700 Subject: RTC: Rework RTC code to use timerqueue for events This patch reworks a large portion of the generic RTC code to in-effect virtualize the rtc interrupt code. The current RTC interface is very much a raw hardware interface. Via the proc, /dev/, or sysfs interfaces, applciations can set the hardware to trigger interrupts in one of three modes: AIE: Alarm interrupt UIE: Update interrupt (ie: once per second) PIE: Periodic interrupt (sub-second irqs) The problem with this interface is that it limits the RTC hardware so it can only be used by one application at a time. The purpose of this patch is to extend the RTC code so that we can multiplex multiple applications event needs onto a single RTC device. This is done by utilizing the timerqueue infrastructure to manage a list of events, which cause the RTC hardware to be programmed to fire an interrupt for the next event in the list. In order to preserve the functionality of the exsting proc,/dev/ and sysfs interfaces, we emulate the different interrupt modes as follows: AIE: We create a rtc_timer dedicated to AIE mode interrupts. There is only one per device, so we don't change existing interface semantics. UIE: Again, a dedicated rtc_timer, set for periodic mode, is used to emulate UIE interrupts. Again, only one per device. PIE: Since PIE mode interrupts fire faster then the RTC's clock read granularity, we emulate PIE mode interrupts using a hrtimer. Again, one per device. With this patch, the rtctest.c application in Documentation/rtc.txt passes fine on x86 hardware. However, there may very well still be bugs, so greatly I'd appreciate any feedback or testing! Signed-off-by: John Stultz LKML Reference: <1290136329-18291-4-git-send-email-john.stultz@linaro.org> Acked-by: Alessandro Zummo Reviewed-by: Thomas Gleixner CC: Alessandro Zummo CC: Thomas Gleixner CC: Richard Cochran --- drivers/rtc/class.c | 13 ++ drivers/rtc/interface.c | 574 +++++++++++++++++++++++++++++------------------- drivers/rtc/rtc-lib.c | 28 +++ 3 files changed, 390 insertions(+), 225 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 565562ba6ac9..95d2b82762d6 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "rtc-core.h" @@ -152,6 +153,18 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, spin_lock_init(&rtc->irq_task_lock); init_waitqueue_head(&rtc->irq_queue); + /* Init timerqueue */ + timerqueue_init_head(&rtc->timerqueue); + INIT_WORK(&rtc->irqwork, rtctimer_do_work); + /* Init aie timer */ + rtctimer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc); + /* Init uie timer */ + rtctimer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc); + /* Init pie timer */ + hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + rtc->pie_timer.function = rtc_pie_update_irq; + rtc->pie_enabled = 0; + strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE); dev_set_name(&rtc->dev, "rtc%d", id); diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index a0c816238aa9..c81c50b497b7 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -14,15 +14,11 @@ #include #include #include +#include -int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) +static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) { int err; - - err = mutex_lock_interruptible(&rtc->ops_lock); - if (err) - return err; - if (!rtc->ops) err = -ENODEV; else if (!rtc->ops->read_time) @@ -31,7 +27,18 @@ int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) memset(tm, 0, sizeof(struct rtc_time)); err = rtc->ops->read_time(rtc->dev.parent, tm); } + return err; +} + +int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm) +{ + int err; + err = mutex_lock_interruptible(&rtc->ops_lock); + if (err) + return err; + + err = __rtc_read_time(rtc, tm); mutex_unlock(&rtc->ops_lock); return err; } @@ -106,188 +113,54 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs) } EXPORT_SYMBOL_GPL(rtc_set_mmss); -static int rtc_read_alarm_internal(struct rtc_device *rtc, struct rtc_wkalrm *alarm) +int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) { int err; err = mutex_lock_interruptible(&rtc->ops_lock); if (err) return err; - - if (rtc->ops == NULL) - err = -ENODEV; - else if (!rtc->ops->read_alarm) - err = -EINVAL; - else { - memset(alarm, 0, sizeof(struct rtc_wkalrm)); - err = rtc->ops->read_alarm(rtc->dev.parent, alarm); - } - + alarm->enabled = rtc->aie_timer.enabled; + if (alarm->enabled) + alarm->time = rtc_ktime_to_tm(rtc->aie_timer.node.expires); mutex_unlock(&rtc->ops_lock); - return err; + + return 0; } +EXPORT_SYMBOL_GPL(rtc_read_alarm); -int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) +int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) { + struct rtc_time tm; + long now, scheduled; int err; - struct rtc_time before, now; - int first_time = 1; - unsigned long t_now, t_alm; - enum { none, day, month, year } missing = none; - unsigned days; - - /* The lower level RTC driver may return -1 in some fields, - * creating invalid alarm->time values, for reasons like: - * - * - The hardware may not be capable of filling them in; - * many alarms match only on time-of-day fields, not - * day/month/year calendar data. - * - * - Some hardware uses illegal values as "wildcard" match - * values, which non-Linux firmware (like a BIOS) may try - * to set up as e.g. "alarm 15 minutes after each hour". - * Linux uses only oneshot alarms. - * - * When we see that here, we deal with it by using values from - * a current RTC timestamp for any missing (-1) values. The - * RTC driver prevents "periodic alarm" modes. - * - * But this can be racey, because some fields of the RTC timestamp - * may have wrapped in the interval since we read the RTC alarm, - * which would lead to us inserting inconsistent values in place - * of the -1 fields. - * - * Reading the alarm and timestamp in the reverse sequence - * would have the same race condition, and not solve the issue. - * - * So, we must first read the RTC timestamp, - * then read the RTC alarm value, - * and then read a second RTC timestamp. - * - * If any fields of the second timestamp have changed - * when compared with the first timestamp, then we know - * our timestamp may be inconsistent with that used by - * the low-level rtc_read_alarm_internal() function. - * - * So, when the two timestamps disagree, we just loop and do - * the process again to get a fully consistent set of values. - * - * This could all instead be done in the lower level driver, - * but since more than one lower level RTC implementation needs it, - * then it's probably best best to do it here instead of there.. - */ - /* Get the "before" timestamp */ - err = rtc_read_time(rtc, &before); - if (err < 0) + err = rtc_valid_tm(&alarm->time); + if (err) return err; - do { - if (!first_time) - memcpy(&before, &now, sizeof(struct rtc_time)); - first_time = 0; - - /* get the RTC alarm values, which may be incomplete */ - err = rtc_read_alarm_internal(rtc, alarm); - if (err) - return err; - if (!alarm->enabled) - return 0; - - /* full-function RTCs won't have such missing fields */ - if (rtc_valid_tm(&alarm->time) == 0) - return 0; - - /* get the "after" timestamp, to detect wrapped fields */ - err = rtc_read_time(rtc, &now); - if (err < 0) - return err; - - /* note that tm_sec is a "don't care" value here: */ - } while ( before.tm_min != now.tm_min - || before.tm_hour != now.tm_hour - || before.tm_mon != now.tm_mon - || before.tm_year != now.tm_year); - - /* Fill in the missing alarm fields using the timestamp; we - * know there's at least one since alarm->time is invalid. - */ - if (alarm->time.tm_sec == -1) - alarm->time.tm_sec = now.tm_sec; - if (alarm->time.tm_min == -1) - alarm->time.tm_min = now.tm_min; - if (alarm->time.tm_hour == -1) - alarm->time.tm_hour = now.tm_hour; - - /* For simplicity, only support date rollover for now */ - if (alarm->time.tm_mday == -1) { - alarm->time.tm_mday = now.tm_mday; - missing = day; - } - if (alarm->time.tm_mon == -1) { - alarm->time.tm_mon = now.tm_mon; - if (missing == none) - missing = month; - } - if (alarm->time.tm_year == -1) { - alarm->time.tm_year = now.tm_year; - if (missing == none) - missing = year; - } - - /* with luck, no rollover is needed */ - rtc_tm_to_time(&now, &t_now); - rtc_tm_to_time(&alarm->time, &t_alm); - if (t_now < t_alm) - goto done; - - switch (missing) { + rtc_tm_to_time(&alarm->time, &scheduled); - /* 24 hour rollover ... if it's now 10am Monday, an alarm that - * that will trigger at 5am will do so at 5am Tuesday, which - * could also be in the next month or year. This is a common - * case, especially for PCs. - */ - case day: - dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day"); - t_alm += 24 * 60 * 60; - rtc_time_to_tm(t_alm, &alarm->time); - break; - - /* Month rollover ... if it's the 31th, an alarm on the 3rd will - * be next month. An alarm matching on the 30th, 29th, or 28th - * may end up in the month after that! Many newer PCs support - * this type of alarm. + /* Make sure we're not setting alarms in the past */ + err = __rtc_read_time(rtc, &tm); + rtc_tm_to_time(&tm, &now); + if (scheduled <= now) + return -ETIME; + /* + * XXX - We just checked to make sure the alarm time is not + * in the past, but there is still a race window where if + * the is alarm set for the next second and the second ticks + * over right here, before we set the alarm. */ - case month: - dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month"); - do { - if (alarm->time.tm_mon < 11) - alarm->time.tm_mon++; - else { - alarm->time.tm_mon = 0; - alarm->time.tm_year++; - } - days = rtc_month_days(alarm->time.tm_mon, - alarm->time.tm_year); - } while (days < alarm->time.tm_mday); - break; - - /* Year rollover ... easy except for leap years! */ - case year: - dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year"); - do { - alarm->time.tm_year++; - } while (rtc_valid_tm(&alarm->time) != 0); - break; - - default: - dev_warn(&rtc->dev, "alarm rollover not handled\n"); - } -done: - return 0; + if (!rtc->ops) + err = -ENODEV; + else if (!rtc->ops->set_alarm) + err = -EINVAL; + else + err = rtc->ops->set_alarm(rtc->dev.parent, alarm); + + return err; } -EXPORT_SYMBOL_GPL(rtc_read_alarm); int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) { @@ -300,16 +173,18 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) err = mutex_lock_interruptible(&rtc->ops_lock); if (err) return err; - - if (!rtc->ops) - err = -ENODEV; - else if (!rtc->ops->set_alarm) - err = -EINVAL; - else - err = rtc->ops->set_alarm(rtc->dev.parent, alarm); - + if (rtc->aie_timer.enabled) { + rtctimer_remove(rtc, &rtc->aie_timer); + rtc->aie_timer.enabled = 0; + } + rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time); + rtc->aie_timer.period = ktime_set(0, 0); + if (alarm->enabled) { + rtc->aie_timer.enabled = 1; + rtctimer_enqueue(rtc, &rtc->aie_timer); + } mutex_unlock(&rtc->ops_lock); - return err; + return 0; } EXPORT_SYMBOL_GPL(rtc_set_alarm); @@ -319,6 +194,16 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled) if (err) return err; + if (rtc->aie_timer.enabled != enabled) { + if (enabled) { + rtc->aie_timer.enabled = 1; + rtctimer_enqueue(rtc, &rtc->aie_timer); + } else { + rtctimer_remove(rtc, &rtc->aie_timer); + rtc->aie_timer.enabled = 0; + } + } + if (!rtc->ops) err = -ENODEV; else if (!rtc->ops->alarm_irq_enable) @@ -337,52 +222,53 @@ 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, enabled); + /* make sure we're changing state */ + if (rtc->uie_rtctimer.enabled == enabled) + goto out; + + if (enabled) { + struct rtc_time tm; + ktime_t now, onesec; + + __rtc_read_time(rtc, &tm); + onesec = ktime_set(1, 0); + now = rtc_tm_to_ktime(tm); + rtc->uie_rtctimer.node.expires = ktime_add(now, onesec); + rtc->uie_rtctimer.period = ktime_set(1, 0); + rtc->uie_rtctimer.enabled = 1; + rtctimer_enqueue(rtc, &rtc->uie_rtctimer); + } else { + rtctimer_remove(rtc, &rtc->uie_rtctimer); + rtc->uie_rtctimer.enabled = 0; } -#endif - - if (!rtc->ops) - err = -ENODEV; - else if (!rtc->ops->update_irq_enable) - err = -EINVAL; - else - err = rtc->ops->update_irq_enable(rtc->dev.parent, 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; + } EXPORT_SYMBOL_GPL(rtc_update_irq_enable); + /** - * rtc_update_irq - report RTC periodic, alarm, and/or update irqs - * @rtc: the rtc device - * @num: how many irqs are being reported (usually one) - * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF - * Context: any + * rtc_handle_legacy_irq - AIE, UIE and PIE event hook + * @rtc: pointer to the rtc device + * + * This function is called when an AIE, UIE or PIE mode interrupt + * has occured (or been emulated). + * + * Triggers the registered irq_task function callback. */ -void rtc_update_irq(struct rtc_device *rtc, - unsigned long num, unsigned long events) +static void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode) { unsigned long flags; + /* mark one irq of the appropriate mode */ spin_lock_irqsave(&rtc->irq_lock, flags); - rtc->irq_data = (rtc->irq_data + (num << 8)) | events; + rtc->irq_data = (rtc->irq_data + (num << 8)) | (RTC_IRQF|mode); spin_unlock_irqrestore(&rtc->irq_lock, flags); + /* call the task func */ spin_lock_irqsave(&rtc->irq_task_lock, flags); if (rtc->irq_task) rtc->irq_task->func(rtc->irq_task->private_data); @@ -391,6 +277,69 @@ void rtc_update_irq(struct rtc_device *rtc, wake_up_interruptible(&rtc->irq_queue); kill_fasync(&rtc->async_queue, SIGIO, POLL_IN); } + + +/** + * rtc_aie_update_irq - AIE mode rtctimer hook + * @private: pointer to the rtc_device + * + * This functions is called when the aie_timer expires. + */ +void rtc_aie_update_irq(void *private) +{ + struct rtc_device *rtc = (struct rtc_device *)private; + rtc_handle_legacy_irq(rtc, 1, RTC_AF); +} + + +/** + * rtc_uie_update_irq - UIE mode rtctimer hook + * @private: pointer to the rtc_device + * + * This functions is called when the uie_timer expires. + */ +void rtc_uie_update_irq(void *private) +{ + struct rtc_device *rtc = (struct rtc_device *)private; + rtc_handle_legacy_irq(rtc, 1, RTC_UF); +} + + +/** + * rtc_pie_update_irq - PIE mode hrtimer hook + * @timer: pointer to the pie mode hrtimer + * + * This function is used to emulate PIE mode interrupts + * using an hrtimer. This function is called when the periodic + * hrtimer expires. + */ +enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer) +{ + struct rtc_device *rtc; + ktime_t period; + int count; + rtc = container_of(timer, struct rtc_device, pie_timer); + + period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq); + count = hrtimer_forward_now(timer, period); + + rtc_handle_legacy_irq(rtc, count, RTC_PF); + + return HRTIMER_RESTART; +} + +/** + * rtc_update_irq - Triggered when a RTC interrupt occurs. + * @rtc: the rtc device + * @num: how many irqs are being reported (usually one) + * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF + * Context: any + */ +void rtc_update_irq(struct rtc_device *rtc, + unsigned long num, unsigned long events) +{ + schedule_work(&rtc->irqwork); +} EXPORT_SYMBOL_GPL(rtc_update_irq); static int __rtc_match(struct device *dev, void *data) @@ -477,18 +426,20 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled int err = 0; unsigned long flags; - if (rtc->ops->irq_set_state == NULL) - return -ENXIO; - spin_lock_irqsave(&rtc->irq_task_lock, flags); if (rtc->irq_task != NULL && task == NULL) err = -EBUSY; if (rtc->irq_task != task) err = -EACCES; - spin_unlock_irqrestore(&rtc->irq_task_lock, flags); - if (err == 0) - err = rtc->ops->irq_set_state(rtc->dev.parent, enabled); + if (enabled) { + ktime_t period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq); + hrtimer_start(&rtc->pie_timer, period, HRTIMER_MODE_REL); + } else { + hrtimer_cancel(&rtc->pie_timer); + } + rtc->pie_enabled = enabled; + spin_unlock_irqrestore(&rtc->irq_task_lock, flags); return err; } @@ -509,21 +460,194 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) int err = 0; unsigned long flags; - if (rtc->ops->irq_set_freq == NULL) - return -ENXIO; - spin_lock_irqsave(&rtc->irq_task_lock, flags); if (rtc->irq_task != NULL && task == NULL) err = -EBUSY; if (rtc->irq_task != task) err = -EACCES; - spin_unlock_irqrestore(&rtc->irq_task_lock, flags); - if (err == 0) { - err = rtc->ops->irq_set_freq(rtc->dev.parent, freq); - if (err == 0) - rtc->irq_freq = freq; + rtc->irq_freq = freq; + if (rtc->pie_enabled) { + ktime_t period; + hrtimer_cancel(&rtc->pie_timer); + period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq); + hrtimer_start(&rtc->pie_timer, period, + HRTIMER_MODE_REL); + } } + spin_unlock_irqrestore(&rtc->irq_task_lock, flags); return err; } EXPORT_SYMBOL_GPL(rtc_irq_set_freq); + +/** + * rtctimer_enqueue - Adds a rtc_timer to the rtc_device timerqueue + * @rtc rtc device + * @timer timer being added. + * + * Enqueues a timer onto the rtc devices timerqueue and sets + * the next alarm event appropriately. + * + * Must hold ops_lock for proper serialization of timerqueue + */ +void rtctimer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) +{ + timerqueue_add(&rtc->timerqueue, &timer->node); + if (&timer->node == timerqueue_getnext(&rtc->timerqueue)) { + struct rtc_wkalrm alarm; + int err; + alarm.time = rtc_ktime_to_tm(timer->node.expires); + alarm.enabled = 1; + err = __rtc_set_alarm(rtc, &alarm); + if (err == -ETIME) + schedule_work(&rtc->irqwork); + } +} + +/** + * rtctimer_remove - Removes a rtc_timer from the rtc_device timerqueue + * @rtc rtc device + * @timer timer being removed. + * + * Removes a timer onto the rtc devices timerqueue and sets + * the next alarm event appropriately. + * + * Must hold ops_lock for proper serialization of timerqueue + */ +void rtctimer_remove(struct rtc_device *rtc, struct rtc_timer *timer) +{ + struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue); + timerqueue_del(&rtc->timerqueue, &timer->node); + + if (next == &timer->node) { + struct rtc_wkalrm alarm; + int err; + next = timerqueue_getnext(&rtc->timerqueue); + if (!next) + return; + alarm.time = rtc_ktime_to_tm(next->expires); + alarm.enabled = 1; + err = __rtc_set_alarm(rtc, &alarm); + if (err == -ETIME) + schedule_work(&rtc->irqwork); + } +} + +/** + * rtctimer_do_work - Expires rtc timers + * @rtc rtc device + * @timer timer being removed. + * + * Expires rtc timers. Reprograms next alarm event if needed. + * Called via worktask. + * + * Serializes access to timerqueue via ops_lock mutex + */ +void rtctimer_do_work(struct work_struct *work) +{ + struct rtc_timer *timer; + struct timerqueue_node *next; + ktime_t now; + struct rtc_time tm; + + struct rtc_device *rtc = + container_of(work, struct rtc_device, irqwork); + + mutex_lock(&rtc->ops_lock); +again: + __rtc_read_time(rtc, &tm); + now = rtc_tm_to_ktime(tm); + while ((next = timerqueue_getnext(&rtc->timerqueue))) { + if (next->expires.tv64 > now.tv64) + break; + + /* expire timer */ + timer = container_of(next, struct rtc_timer, node); + timerqueue_del(&rtc->timerqueue, &timer->node); + timer->enabled = 0; + if (timer->task.func) + timer->task.func(timer->task.private_data); + + /* Re-add/fwd periodic timers */ + if (ktime_to_ns(timer->period)) { + timer->node.expires = ktime_add(timer->node.expires, + timer->period); + timer->enabled = 1; + timerqueue_add(&rtc->timerqueue, &timer->node); + } + } + + /* Set next alarm */ + if (next) { + struct rtc_wkalrm alarm; + int err; + alarm.time = rtc_ktime_to_tm(next->expires); + alarm.enabled = 1; + err = __rtc_set_alarm(rtc, &alarm); + if (err == -ETIME) + goto again; + } + + mutex_unlock(&rtc->ops_lock); +} + + +/* rtctimer_init - Initializes an rtc_timer + * @timer: timer to be intiialized + * @f: function pointer to be called when timer fires + * @data: private data passed to function pointer + * + * Kernel interface to initializing an rtc_timer. + */ +void rtctimer_init(struct rtc_timer *timer, void (*f)(void* p), void* data) +{ + timerqueue_init(&timer->node); + timer->enabled = 0; + timer->task.func = f; + timer->task.private_data = data; +} + +/* rtctimer_start - Sets an rtc_timer to fire in the future + * @ rtc: rtc device to be used + * @ timer: timer being set + * @ expires: time at which to expire the timer + * @ period: period that the timer will recur + * + * Kernel interface to set an rtc_timer + */ +int rtctimer_start(struct rtc_device *rtc, struct rtc_timer* timer, + ktime_t expires, ktime_t period) +{ + int ret = 0; + mutex_lock(&rtc->ops_lock); + if (timer->enabled) + rtctimer_remove(rtc, timer); + + timer->node.expires = expires; + timer->period = period; + + timer->enabled = 1; + rtctimer_enqueue(rtc, timer); + + mutex_unlock(&rtc->ops_lock); + return ret; +} + +/* rtctimer_cancel - Stops an rtc_timer + * @ rtc: rtc device to be used + * @ timer: timer being set + * + * Kernel interface to cancel an rtc_timer + */ +int rtctimer_cancel(struct rtc_device *rtc, struct rtc_timer* timer) +{ + int ret = 0; + mutex_lock(&rtc->ops_lock); + if (timer->enabled) + rtctimer_remove(rtc, timer); + timer->enabled = 0; + mutex_unlock(&rtc->ops_lock); + return ret; +} + + diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index 773851f338b8..075f1708deae 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -117,4 +117,32 @@ int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time) } EXPORT_SYMBOL(rtc_tm_to_time); +/* + * Convert rtc_time to ktime + */ +ktime_t rtc_tm_to_ktime(struct rtc_time tm) +{ + time_t time; + rtc_tm_to_time(&tm, &time); + return ktime_set(time, 0); +} +EXPORT_SYMBOL_GPL(rtc_tm_to_ktime); + +/* + * Convert ktime to rtc_time + */ +struct rtc_time rtc_ktime_to_tm(ktime_t kt) +{ + struct timespec ts; + struct rtc_time ret; + + ts = ktime_to_timespec(kt); + /* Round up any ns */ + if (ts.tv_nsec) + ts.tv_sec++; + rtc_time_to_tm(ts.tv_sec, &ret); + return ret; +} +EXPORT_SYMBOL_GPL(rtc_ktime_to_tm); + MODULE_LICENSE("GPL"); -- cgit v1.2.3 From 042620a018afcfba1d678062b62e463b9e43a68d Mon Sep 17 00:00:00 2001 From: John Stultz Date: Thu, 14 Oct 2010 16:22:33 -0700 Subject: RTC: Remove UIE emulation Since we provide UIE interrupts via a rtc_timer, the old emulation code can be removed. Signed-off-by: John Stultz LKML Reference: <1290136329-18291-5-git-send-email-john.stultz@linaro.org> Acked-by: Alessandro Zummo Reviewed-by: Thomas Gleixner CC: Alessandro Zummo CC: Thomas Gleixner CC: Richard Cochran --- drivers/rtc/rtc-dev.c | 104 -------------------------------------------------- 1 file changed, 104 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 62227cd52410..212b16edafc0 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -46,105 +46,6 @@ static int rtc_dev_open(struct inode *inode, struct file *file) return err; } -#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL -/* - * Routine to poll RTC seconds field for change as often as possible, - * after first RTC_UIE use timer to reduce polling - */ -static void rtc_uie_task(struct work_struct *work) -{ - struct rtc_device *rtc = - container_of(work, struct rtc_device, uie_task); - struct rtc_time tm; - int num = 0; - int err; - - err = rtc_read_time(rtc, &tm); - - spin_lock_irq(&rtc->irq_lock); - if (rtc->stop_uie_polling || err) { - rtc->uie_task_active = 0; - } else if (rtc->oldsecs != tm.tm_sec) { - num = (tm.tm_sec + 60 - rtc->oldsecs) % 60; - rtc->oldsecs = tm.tm_sec; - rtc->uie_timer.expires = jiffies + HZ - (HZ/10); - rtc->uie_timer_active = 1; - rtc->uie_task_active = 0; - add_timer(&rtc->uie_timer); - } else if (schedule_work(&rtc->uie_task) == 0) { - rtc->uie_task_active = 0; - } - spin_unlock_irq(&rtc->irq_lock); - if (num) - rtc_update_irq(rtc, num, RTC_UF | RTC_IRQF); -} -static void rtc_uie_timer(unsigned long data) -{ - struct rtc_device *rtc = (struct rtc_device *)data; - unsigned long flags; - - spin_lock_irqsave(&rtc->irq_lock, flags); - rtc->uie_timer_active = 0; - rtc->uie_task_active = 1; - if ((schedule_work(&rtc->uie_task) == 0)) - rtc->uie_task_active = 0; - spin_unlock_irqrestore(&rtc->irq_lock, flags); -} - -static int clear_uie(struct rtc_device *rtc) -{ - spin_lock_irq(&rtc->irq_lock); - if (rtc->uie_irq_active) { - rtc->stop_uie_polling = 1; - if (rtc->uie_timer_active) { - spin_unlock_irq(&rtc->irq_lock); - del_timer_sync(&rtc->uie_timer); - spin_lock_irq(&rtc->irq_lock); - rtc->uie_timer_active = 0; - } - if (rtc->uie_task_active) { - spin_unlock_irq(&rtc->irq_lock); - flush_scheduled_work(); - spin_lock_irq(&rtc->irq_lock); - } - rtc->uie_irq_active = 0; - } - spin_unlock_irq(&rtc->irq_lock); - return 0; -} - -static int set_uie(struct rtc_device *rtc) -{ - struct rtc_time tm; - int err; - - err = rtc_read_time(rtc, &tm); - if (err) - return err; - spin_lock_irq(&rtc->irq_lock); - if (!rtc->uie_irq_active) { - rtc->uie_irq_active = 1; - rtc->stop_uie_polling = 0; - rtc->oldsecs = tm.tm_sec; - rtc->uie_task_active = 1; - if (schedule_work(&rtc->uie_task) == 0) - rtc->uie_task_active = 0; - } - rtc->irq_data = 0; - spin_unlock_irq(&rtc->irq_lock); - return 0; -} - -int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled) -{ - if (enabled) - return set_uie(rtc); - else - return clear_uie(rtc); -} -EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul); - -#endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */ static ssize_t rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) @@ -493,11 +394,6 @@ void rtc_dev_prepare(struct rtc_device *rtc) rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id); -#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL - INIT_WORK(&rtc->uie_task, rtc_uie_task); - setup_timer(&rtc->uie_timer, rtc_uie_timer, (unsigned long)rtc); -#endif - cdev_init(&rtc->char_dev, &rtc_dev_fops); rtc->char_dev.owner = rtc->owner; } -- cgit v1.2.3 From 96c8f06a0fb359a9a89701a7afab6d837e466ab0 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Mon, 13 Dec 2010 22:45:48 +0100 Subject: rtc: Namespace fixup rtctimer_* is already occupied by sound/core/rtctimer.c. Instead of fiddling with that, rename the new functions to rtc_timer_* which reads nicer anyway. Signed-off-by: Thomas Gleixner Cc: John Stultz --- drivers/rtc/class.c | 6 +++--- drivers/rtc/interface.c | 42 +++++++++++++++++++++--------------------- 2 files changed, 24 insertions(+), 24 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 95d2b82762d6..3243832a17cd 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -155,11 +155,11 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, /* Init timerqueue */ timerqueue_init_head(&rtc->timerqueue); - INIT_WORK(&rtc->irqwork, rtctimer_do_work); + INIT_WORK(&rtc->irqwork, rtc_timer_do_work); /* Init aie timer */ - rtctimer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc); + rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc); /* Init uie timer */ - rtctimer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc); + rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc); /* Init pie timer */ hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); rtc->pie_timer.function = rtc_pie_update_irq; diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index c81c50b497b7..90384b9f6b2c 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -174,14 +174,14 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) if (err) return err; if (rtc->aie_timer.enabled) { - rtctimer_remove(rtc, &rtc->aie_timer); + rtc_timer_remove(rtc, &rtc->aie_timer); rtc->aie_timer.enabled = 0; } rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time); rtc->aie_timer.period = ktime_set(0, 0); if (alarm->enabled) { rtc->aie_timer.enabled = 1; - rtctimer_enqueue(rtc, &rtc->aie_timer); + rtc_timer_enqueue(rtc, &rtc->aie_timer); } mutex_unlock(&rtc->ops_lock); return 0; @@ -197,9 +197,9 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled) if (rtc->aie_timer.enabled != enabled) { if (enabled) { rtc->aie_timer.enabled = 1; - rtctimer_enqueue(rtc, &rtc->aie_timer); + rtc_timer_enqueue(rtc, &rtc->aie_timer); } else { - rtctimer_remove(rtc, &rtc->aie_timer); + rtc_timer_remove(rtc, &rtc->aie_timer); rtc->aie_timer.enabled = 0; } } @@ -236,9 +236,9 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled) rtc->uie_rtctimer.node.expires = ktime_add(now, onesec); rtc->uie_rtctimer.period = ktime_set(1, 0); rtc->uie_rtctimer.enabled = 1; - rtctimer_enqueue(rtc, &rtc->uie_rtctimer); + rtc_timer_enqueue(rtc, &rtc->uie_rtctimer); } else { - rtctimer_remove(rtc, &rtc->uie_rtctimer); + rtc_timer_remove(rtc, &rtc->uie_rtctimer); rtc->uie_rtctimer.enabled = 0; } @@ -481,7 +481,7 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) EXPORT_SYMBOL_GPL(rtc_irq_set_freq); /** - * rtctimer_enqueue - Adds a rtc_timer to the rtc_device timerqueue + * rtc_timer_enqueue - Adds a rtc_timer to the rtc_device timerqueue * @rtc rtc device * @timer timer being added. * @@ -490,7 +490,7 @@ EXPORT_SYMBOL_GPL(rtc_irq_set_freq); * * Must hold ops_lock for proper serialization of timerqueue */ -void rtctimer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) +void rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) { timerqueue_add(&rtc->timerqueue, &timer->node); if (&timer->node == timerqueue_getnext(&rtc->timerqueue)) { @@ -505,7 +505,7 @@ void rtctimer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) } /** - * rtctimer_remove - Removes a rtc_timer from the rtc_device timerqueue + * rtc_timer_remove - Removes a rtc_timer from the rtc_device timerqueue * @rtc rtc device * @timer timer being removed. * @@ -514,7 +514,7 @@ void rtctimer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) * * Must hold ops_lock for proper serialization of timerqueue */ -void rtctimer_remove(struct rtc_device *rtc, struct rtc_timer *timer) +void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer) { struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue); timerqueue_del(&rtc->timerqueue, &timer->node); @@ -534,7 +534,7 @@ void rtctimer_remove(struct rtc_device *rtc, struct rtc_timer *timer) } /** - * rtctimer_do_work - Expires rtc timers + * rtc_timer_do_work - Expires rtc timers * @rtc rtc device * @timer timer being removed. * @@ -543,7 +543,7 @@ void rtctimer_remove(struct rtc_device *rtc, struct rtc_timer *timer) * * Serializes access to timerqueue via ops_lock mutex */ -void rtctimer_do_work(struct work_struct *work) +void rtc_timer_do_work(struct work_struct *work) { struct rtc_timer *timer; struct timerqueue_node *next; @@ -592,14 +592,14 @@ again: } -/* rtctimer_init - Initializes an rtc_timer +/* rtc_timer_init - Initializes an rtc_timer * @timer: timer to be intiialized * @f: function pointer to be called when timer fires * @data: private data passed to function pointer * * Kernel interface to initializing an rtc_timer. */ -void rtctimer_init(struct rtc_timer *timer, void (*f)(void* p), void* data) +void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data) { timerqueue_init(&timer->node); timer->enabled = 0; @@ -607,7 +607,7 @@ void rtctimer_init(struct rtc_timer *timer, void (*f)(void* p), void* data) timer->task.private_data = data; } -/* rtctimer_start - Sets an rtc_timer to fire in the future +/* rtc_timer_start - Sets an rtc_timer to fire in the future * @ rtc: rtc device to be used * @ timer: timer being set * @ expires: time at which to expire the timer @@ -615,36 +615,36 @@ void rtctimer_init(struct rtc_timer *timer, void (*f)(void* p), void* data) * * Kernel interface to set an rtc_timer */ -int rtctimer_start(struct rtc_device *rtc, struct rtc_timer* timer, +int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer, ktime_t expires, ktime_t period) { int ret = 0; mutex_lock(&rtc->ops_lock); if (timer->enabled) - rtctimer_remove(rtc, timer); + rtc_timer_remove(rtc, timer); timer->node.expires = expires; timer->period = period; timer->enabled = 1; - rtctimer_enqueue(rtc, timer); + rtc_timer_enqueue(rtc, timer); mutex_unlock(&rtc->ops_lock); return ret; } -/* rtctimer_cancel - Stops an rtc_timer +/* rtc_timer_cancel - Stops an rtc_timer * @ rtc: rtc device to be used * @ timer: timer being set * * Kernel interface to cancel an rtc_timer */ -int rtctimer_cancel(struct rtc_device *rtc, struct rtc_timer* timer) +int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer) { int ret = 0; mutex_lock(&rtc->ops_lock); if (timer->enabled) - rtctimer_remove(rtc, timer); + rtc_timer_remove(rtc, timer); timer->enabled = 0; mutex_unlock(&rtc->ops_lock); return ret; -- cgit v1.2.3 From d2ccb52d88dcb7eb3539d0e0c77a7028b8d46037 Mon Sep 17 00:00:00 2001 From: Marcelo Roberto Jimenez Date: Thu, 16 Dec 2010 21:31:32 +0100 Subject: ARM: 6455/2: Better use of the RTC framework for sa11xx. This patch uses the RTC framework to treat some common ioctl. In particular, it fixes the behaviour of rtc_irq_set_freq(), which did not work as expected because the timer was not beeing retriggered. Signed-off-by: Marcelo Roberto Jimenez Signed-off-by: Russell King --- drivers/rtc/rtc-sa1100.c | 98 ++++++++++++++++++++++++++++++++++++------------ 1 file changed, 74 insertions(+), 24 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c index b0985f727078..88ea52b8647a 100644 --- a/drivers/rtc/rtc-sa1100.c +++ b/drivers/rtc/rtc-sa1100.c @@ -42,7 +42,7 @@ #define RTC_DEF_DIVIDER (32768 - 1) #define RTC_DEF_TRIM 0 -static unsigned long rtc_freq = 1024; +static const unsigned long RTC_FREQ = 1024; static unsigned long timer_freq; static struct rtc_time rtc_alarm; static DEFINE_SPINLOCK(sa1100_rtc_lock); @@ -156,8 +156,58 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static int sa1100_irq_set_freq(struct device *dev, int freq) +{ + if (freq < 1 || freq > timer_freq) { + return -EINVAL; + } else { + struct rtc_device *rtc = (struct rtc_device *)dev; + + rtc->irq_freq = freq; + + return 0; + } +} + static int rtc_timer1_count; +static int sa1100_irq_set_state(struct device *dev, int enabled) +{ + spin_lock_irq(&sa1100_rtc_lock); + if (enabled) { + struct rtc_device *rtc = (struct rtc_device *)dev; + + OSMR1 = timer_freq / rtc->irq_freq + OSCR; + OIER |= OIER_E1; + rtc_timer1_count = 1; + } else { + OIER &= ~OIER_E1; + } + spin_unlock_irq(&sa1100_rtc_lock); + + return 0; +} + +static inline int sa1100_timer1_retrigger(struct rtc_device *rtc) +{ + unsigned long diff; + unsigned long period = timer_freq / rtc->irq_freq; + + spin_lock_irq(&sa1100_rtc_lock); + + do { + OSMR1 += period; + diff = OSMR1 - OSCR; + /* If OSCR > OSMR1, diff is a very large number (unsigned + * math). This means we have a lost interrupt. */ + } while (diff > period); + OIER |= OIER_E1; + + spin_unlock_irq(&sa1100_rtc_lock); + + return 0; +} + static irqreturn_t timer1_interrupt(int irq, void *dev_id) { struct platform_device *pdev = to_platform_device(dev_id); @@ -175,7 +225,11 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id) rtc_update_irq(rtc, rtc_timer1_count, RTC_PF | RTC_IRQF); if (rtc_timer1_count == 1) - rtc_timer1_count = (rtc_freq * ((1 << 30) / (timer_freq >> 2))); + rtc_timer1_count = + (rtc->irq_freq * ((1 << 30) / (timer_freq >> 2))); + + /* retrigger. */ + sa1100_timer1_retrigger(rtc); return IRQ_HANDLED; } @@ -183,8 +237,10 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id) static int sa1100_rtc_read_callback(struct device *dev, int data) { if (data & RTC_PF) { + struct rtc_device *rtc = (struct rtc_device *)dev; + /* interpolate missed periods and set match for the next */ - unsigned long period = timer_freq / rtc_freq; + unsigned long period = timer_freq / rtc->irq_freq; unsigned long oscr = OSCR; unsigned long osmr1 = OSMR1; unsigned long missed = (oscr - osmr1)/period; @@ -207,6 +263,7 @@ static int sa1100_rtc_read_callback(struct device *dev, int data) static int sa1100_rtc_open(struct device *dev) { int ret; + struct rtc_device *rtc = (struct rtc_device *)dev; ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED, "rtc 1Hz", dev); @@ -226,6 +283,9 @@ static int sa1100_rtc_open(struct device *dev) dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1); goto fail_pi; } + rtc->max_user_freq = RTC_FREQ; + sa1100_irq_set_freq(dev, RTC_FREQ); + return 0; fail_pi: @@ -274,25 +334,6 @@ static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd, RTSR |= RTSR_HZE; spin_unlock_irq(&sa1100_rtc_lock); return 0; - case RTC_PIE_OFF: - spin_lock_irq(&sa1100_rtc_lock); - OIER &= ~OIER_E1; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - case RTC_PIE_ON: - spin_lock_irq(&sa1100_rtc_lock); - OSMR1 = timer_freq / rtc_freq + OSCR; - OIER |= OIER_E1; - rtc_timer1_count = 1; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - case RTC_IRQP_READ: - return put_user(rtc_freq, (unsigned long *)arg); - case RTC_IRQP_SET: - if (arg < 1 || arg > timer_freq) - return -EINVAL; - rtc_freq = arg; - return 0; } return -ENOIOCTLCMD; } @@ -344,12 +385,14 @@ static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq) { + struct rtc_device *rtc = (struct rtc_device *)dev; + seq_printf(seq, "trim/divider\t: 0x%08x\n", (u32) RTTR); seq_printf(seq, "update_IRQ\t: %s\n", (RTSR & RTSR_HZE) ? "yes" : "no"); seq_printf(seq, "periodic_IRQ\t: %s\n", (OIER & OIER_E1) ? "yes" : "no"); - seq_printf(seq, "periodic_freq\t: %ld\n", rtc_freq); + seq_printf(seq, "periodic_freq\t: %d\n", rtc->irq_freq); seq_printf(seq, "RTSR\t\t: 0x%08x\n", (u32)RTSR); return 0; @@ -365,6 +408,8 @@ static const struct rtc_class_ops sa1100_rtc_ops = { .read_alarm = sa1100_rtc_read_alarm, .set_alarm = sa1100_rtc_set_alarm, .proc = sa1100_rtc_proc, + .irq_set_freq = sa1100_irq_set_freq, + .irq_set_state = sa1100_irq_set_state, }; static int sa1100_rtc_probe(struct platform_device *pdev) @@ -391,13 +436,18 @@ static int sa1100_rtc_probe(struct platform_device *pdev) device_init_wakeup(&pdev->dev, 1); rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops, - THIS_MODULE); + THIS_MODULE); if (IS_ERR(rtc)) return PTR_ERR(rtc); platform_set_drvdata(pdev, rtc); + /* Set the irq_freq */ + /*TODO: Find out who is messing with this value after we initialize + * it here.*/ + rtc->irq_freq = RTC_FREQ; + /* Fix for a nasty initialization problem the in SA11xx RTSR register. * See also the comments in sa1100_rtc_interrupt(). * -- cgit v1.2.3 From 118364948fad7b6c0469ef2d3ddaee447d7a0b5f Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 21 Dec 2010 17:24:24 -0800 Subject: rtc: rs5c372: fix buffer size Match the buffer size to the amount of initialized values. Before, it was one too big and thus destroyed the neighbouring register causing the clock to run at false speeds. Reported-by: Andre van Rooyen Signed-off-by: Wolfram Sang Cc: Alessandro Zummo Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-rs5c372.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c index 90cf0a6ff23e..dd14e202c2c8 100644 --- a/drivers/rtc/rtc-rs5c372.c +++ b/drivers/rtc/rtc-rs5c372.c @@ -207,7 +207,7 @@ static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) { struct rs5c372 *rs5c = i2c_get_clientdata(client); - unsigned char buf[8]; + unsigned char buf[7]; int addr; dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " -- cgit v1.2.3 From 9db8995be5e1869b5effa117909bc285e06fc09b Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 24 Dec 2010 16:00:17 +0100 Subject: rtc: don't use flush_scheduled_work() flush_scheduled_work() is deprecated and scheduled to be removed. On removal, directly cancel the work, and flush the uie_task in rtc-dev.c::clear_uie(). Signed-off-by: Tejun Heo Cc: Alessandro Zummo Cc: rtc-linux@googlegroups.com --- drivers/rtc/rtc-dev.c | 2 +- drivers/rtc/rtc-ds1305.c | 2 +- drivers/rtc/rtc-ds1374.c | 2 +- drivers/rtc/rtc-ds3232.c | 2 +- drivers/rtc/rtc-rx8025.c | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 62227cd52410..0cc0984d155b 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -104,7 +104,7 @@ static int clear_uie(struct rtc_device *rtc) } if (rtc->uie_task_active) { spin_unlock_irq(&rtc->irq_lock); - flush_scheduled_work(); + flush_work_sync(&rtc->uie_task); spin_lock_irq(&rtc->irq_lock); } rtc->uie_irq_active = 0; diff --git a/drivers/rtc/rtc-ds1305.c b/drivers/rtc/rtc-ds1305.c index 48da85e97ca4..077af1d7b9e4 100644 --- a/drivers/rtc/rtc-ds1305.c +++ b/drivers/rtc/rtc-ds1305.c @@ -813,7 +813,7 @@ static int __devexit ds1305_remove(struct spi_device *spi) if (spi->irq) { set_bit(FLAG_EXITING, &ds1305->flags); free_irq(spi->irq, ds1305); - flush_scheduled_work(); + cancel_work_sync(&ds1305->work); } rtc_device_unregister(ds1305->rtc); diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c index 1f0007fd4431..47fb6357c346 100644 --- a/drivers/rtc/rtc-ds1374.c +++ b/drivers/rtc/rtc-ds1374.c @@ -417,7 +417,7 @@ static int __devexit ds1374_remove(struct i2c_client *client) mutex_unlock(&ds1374->mutex); free_irq(client->irq, client); - flush_scheduled_work(); + cancel_work_sync(&ds1374->work); } rtc_device_unregister(ds1374->rtc); diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c index 57063552d3b7..23a9ee19764c 100644 --- a/drivers/rtc/rtc-ds3232.c +++ b/drivers/rtc/rtc-ds3232.c @@ -463,7 +463,7 @@ static int __devexit ds3232_remove(struct i2c_client *client) mutex_unlock(&ds3232->mutex); free_irq(client->irq, client); - flush_scheduled_work(); + cancel_work_sync(&ds3232->work); } rtc_device_unregister(ds3232->rtc); diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c index 1146e3522d3c..af32a62e12a8 100644 --- a/drivers/rtc/rtc-rx8025.c +++ b/drivers/rtc/rtc-rx8025.c @@ -650,7 +650,7 @@ static int __devexit rx8025_remove(struct i2c_client *client) mutex_unlock(lock); free_irq(client->irq, client); - flush_scheduled_work(); + cancel_work_sync(&rx8025->work); } rx8025_sysfs_unregister(&client->dev); -- cgit v1.2.3 From 0cc43a1806f078f7fd414850d8f1f1761696e4af Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Mon, 10 Jan 2011 22:11:23 +0100 Subject: i2c: Constify i2c_client where possible Helper functions for I2C and SMBus transactions don't modify the i2c_client that is passed to them, so it can be marked const. Signed-off-by: Jean Delvare --- drivers/rtc/rtc-ds1307.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index d827ce570a8c..0d559b6416dd 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -106,9 +106,9 @@ struct ds1307 { struct i2c_client *client; struct rtc_device *rtc; struct work_struct work; - s32 (*read_block_data)(struct i2c_client *client, u8 command, + s32 (*read_block_data)(const struct i2c_client *client, u8 command, u8 length, u8 *values); - s32 (*write_block_data)(struct i2c_client *client, u8 command, + s32 (*write_block_data)(const struct i2c_client *client, u8 command, u8 length, const u8 *values); }; @@ -158,8 +158,8 @@ MODULE_DEVICE_TABLE(i2c, ds1307_id); #define BLOCK_DATA_MAX_TRIES 10 -static s32 ds1307_read_block_data_once(struct i2c_client *client, u8 command, - u8 length, u8 *values) +static s32 ds1307_read_block_data_once(const struct i2c_client *client, + u8 command, u8 length, u8 *values) { s32 i, data; @@ -172,7 +172,7 @@ static s32 ds1307_read_block_data_once(struct i2c_client *client, u8 command, return i; } -static s32 ds1307_read_block_data(struct i2c_client *client, u8 command, +static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command, u8 length, u8 *values) { u8 oldvalues[I2C_SMBUS_BLOCK_MAX]; @@ -198,7 +198,7 @@ static s32 ds1307_read_block_data(struct i2c_client *client, u8 command, return length; } -static s32 ds1307_write_block_data(struct i2c_client *client, u8 command, +static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command, u8 length, const u8 *values) { u8 currvalues[I2C_SMBUS_BLOCK_MAX]; -- cgit v1.2.3 From 19412ce9fcc9ca2d0f5b62af15c63381f0ac9657 Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Wed, 12 Jan 2011 17:00:05 -0800 Subject: drivers/rtc/rtc-omap.c: fix a memory leak request_mem_region() will call kzalloc to allocate memory for struct resource. release_resource() unregisters the resource but does not free the allocated memory, thus use release_mem_region() instead to fix the memory leak. Also add a missing iounmap() in omap_rtc_remove(). Signed-off-by: Axel Lin Cc: Alessandro Zummo Cc: Sekhar Nori Cc: Kevin Hilman Cc: Tony Lindgren Acked-by: Mark A. Greer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-omap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 73377b0d65da..e72b523c79a5 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -429,13 +429,14 @@ fail1: fail0: iounmap(rtc_base); fail: - release_resource(mem); + release_mem_region(mem->start, resource_size(mem)); return -EIO; } static int __exit omap_rtc_remove(struct platform_device *pdev) { struct rtc_device *rtc = platform_get_drvdata(pdev); + struct resource *mem = dev_get_drvdata(&rtc->dev); device_init_wakeup(&pdev->dev, 0); @@ -447,8 +448,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) if (omap_rtc_timer != omap_rtc_alarm) free_irq(omap_rtc_alarm, rtc); - release_resource(dev_get_drvdata(&rtc->dev)); rtc_device_unregister(rtc); + iounmap(rtc_base); + release_mem_region(mem->start, resource_size(mem)); return 0; } -- cgit v1.2.3 From 2fb08e6ca9f00d1aedb3964983e9c8f84b36b807 Mon Sep 17 00:00:00 2001 From: Paul Fox Date: Wed, 12 Jan 2011 17:00:07 -0800 Subject: rtc-cmos: fix suspend/resume rtc-cmos was setting suspend/resume hooks at the device_driver level. However, the platform bus code (drivers/base/platform.c) only looks for resume hooks at the dev_pm_ops level, or within the platform_driver. Switch rtc_cmos to use dev_pm_ops so that suspend/resume code is executed again. Paul said: : The user visible symptom in our (XO laptop) case was that rtcwake would : fail to wake the laptop. The RTC alarm would expire, but the wakeup : wasn't unmasked. : : As for severity, the impact may have been reduced because if I recall : correctly, the bug only affected platforms with CONFIG_PNP disabled. Signed-off-by: Paul Fox Signed-off-by: Daniel Drake Acked-by: Rafael J. Wysocki Cc: [2.6.37.x] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-cmos.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index 7e6ce626b7f1..c7ff8df347e7 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -36,6 +36,7 @@ #include #include #include +#include /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include @@ -851,7 +852,7 @@ static void __exit cmos_do_remove(struct device *dev) #ifdef CONFIG_PM -static int cmos_suspend(struct device *dev, pm_message_t mesg) +static int cmos_suspend(struct device *dev) { struct cmos_rtc *cmos = dev_get_drvdata(dev); unsigned char tmp; @@ -899,7 +900,7 @@ static int cmos_suspend(struct device *dev, pm_message_t mesg) */ static inline int cmos_poweroff(struct device *dev) { - return cmos_suspend(dev, PMSG_HIBERNATE); + return cmos_suspend(dev); } static int cmos_resume(struct device *dev) @@ -946,9 +947,9 @@ static int cmos_resume(struct device *dev) return 0; } +static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume); + #else -#define cmos_suspend NULL -#define cmos_resume NULL static inline int cmos_poweroff(struct device *dev) { @@ -1078,7 +1079,7 @@ static void __exit cmos_pnp_remove(struct pnp_dev *pnp) static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg) { - return cmos_suspend(&pnp->dev, mesg); + return cmos_suspend(&pnp->dev); } static int cmos_pnp_resume(struct pnp_dev *pnp) @@ -1158,8 +1159,9 @@ static struct platform_driver cmos_platform_driver = { .shutdown = cmos_platform_shutdown, .driver = { .name = (char *) driver_name, - .suspend = cmos_suspend, - .resume = cmos_resume, +#ifdef CONFIG_PM + .pm = &cmos_pm_ops, +#endif } }; -- cgit v1.2.3 From 5f003feba2a8761d2ee7b367df5a0fe6b729dc8f Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Wed, 12 Jan 2011 17:00:09 -0800 Subject: rtc: rtc-max6902 - set driver data in max6902_probe() Current implementation does not set driver data in max6902_probe(), thus calling platform_get_drvdata(spi) in max6902_remove() returns NULL. Signed-off-by: Axel Lin Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-max6902.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/rtc') diff --git a/drivers/rtc/rtc-max6902.c b/drivers/rtc/rtc-max6902.c index 657403ebd54a..0ec3f588a255 100644 --- a/drivers/rtc/rtc-max6902.c +++ b/drivers/rtc/rtc-max6902.c @@ -139,12 +139,13 @@ static int __devinit max6902_probe(struct spi_device *spi) if (IS_ERR(rtc)) return PTR_ERR(rtc); + dev_set_drvdata(&spi->dev, rtc); return 0; } static int __devexit max6902_remove(struct spi_device *spi) { - struct rtc_device *rtc = platform_get_drvdata(spi); + struct rtc_device *rtc = dev_get_drvdata(&spi->dev); rtc_device_unregister(rtc); return 0; -- cgit v1.2.3 From 337ce5d1c5759644cea6c47220ce7e84f0398362 Mon Sep 17 00:00:00 2001 From: MyungJoo Ham Date: Tue, 4 Jan 2011 14:17:39 +0900 Subject: mfd: Support LP3974 RTC The first releases of LP3974 have a large delay in RTC registers, which requires 2 seconds of delay after writing to a rtc register (recommended by National Semiconductor's engineers) before reading it. If "rtc_delay" field of the platform data is true, the rtc driver assumes that such delays are required. Although we have not seen LP3974s without requiring such delays, we assume that such LP3974s will be released soon (or they have done so already) and they are supported by "lp3974" without setting "rtc_delay" at the platform data. This patch adds delays with msleep when writing values to RTC registers if the platform data has rtc_delay set. Signed-off-by: MyungJoo Ham