diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/rtc-mc13783.c | 185 |
1 files changed, 172 insertions, 13 deletions
diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c index 6a36201178a8..d60c81b7b693 100644 --- a/drivers/rtc/rtc-mc13783.c +++ b/drivers/rtc/rtc-mc13783.c @@ -28,6 +28,34 @@ struct mc13783_rtc { int valid; }; +static int mc13783_rtc_irq_enable_unlocked(struct device *dev, + unsigned int enabled, int irq) +{ + struct mc13783_rtc *priv = dev_get_drvdata(dev); + int (*func)(struct mc13783 *mc13783, int irq); + + if (!priv->valid) + return -ENODATA; + + func = enabled ? mc13783_irq_unmask : mc13783_irq_mask; + return func(priv->mc13783, irq); +} + +static int mc13783_rtc_irq_enable(struct device *dev, + unsigned int enabled, int irq) +{ + struct mc13783_rtc *priv = dev_get_drvdata(dev); + int ret; + + mc13783_lock(priv->mc13783); + + ret = mc13783_rtc_irq_enable_unlocked(dev, enabled, irq); + + mc13783_unlock(priv->mc13783); + + return ret; +} + static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct mc13783_rtc *priv = dev_get_drvdata(dev); @@ -78,6 +106,7 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs) { struct mc13783_rtc *priv = dev_get_drvdata(dev); unsigned int seconds, days; + unsigned int alarmseconds; int ret; seconds = secs % 86400; @@ -86,7 +115,22 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs) mc13783_lock(priv->mc13783); /* - * first write seconds=0 to prevent a day switch between writing days + * temporarily invalidate alarm to prevent triggering it when the day is + * already updated while the time isn't yet. + */ + ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &alarmseconds); + if (unlikely(ret)) + goto out; + + if (alarmseconds < 86400) { + ret = mc13783_reg_write(priv->mc13783, + MC13783_RTCTODA, 0x1ffff); + if (unlikely(ret)) + goto out; + } + + /* + * write seconds=0 to prevent a day switch between writing days * and seconds below */ ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, 0); @@ -101,6 +145,14 @@ static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs) if (unlikely(ret)) goto out; + /* restore alarm */ + if (alarmseconds < 86400) { + ret = mc13783_reg_write(priv->mc13783, + MC13783_RTCTODA, alarmseconds); + if (unlikely(ret)) + goto out; + } + ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_RTCRST); if (unlikely(ret)) goto out; @@ -114,6 +166,107 @@ out: return ret; } +static int mc13783_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct mc13783_rtc *priv = dev_get_drvdata(dev); + unsigned seconds, days; + unsigned long s1970; + int enabled, pending; + int ret; + + mc13783_lock(priv->mc13783); + + ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &seconds); + if (unlikely(ret)) + goto out; + if (seconds >= 86400) { + ret = -ENODATA; + goto out; + } + + ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days); + if (unlikely(ret)) + goto out; + + ret = mc13783_irq_status(priv->mc13783, MC13783_IRQ_TODA, + &enabled, &pending); + +out: + mc13783_unlock(priv->mc13783); + + if (ret) + return ret; + + alarm->enabled = enabled; + alarm->pending = pending; + + s1970 = days * 86400 + seconds; + + rtc_time_to_tm(s1970, &alarm->time); + dev_dbg(dev, "%s: %lu\n", __func__, s1970); + + return 0; +} + +static int mc13783_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct mc13783_rtc *priv = dev_get_drvdata(dev); + unsigned long s1970; + unsigned seconds, days; + int ret; + + mc13783_lock(priv->mc13783); + + /* disable alarm to prevent false triggering */ + ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, 0x1ffff); + if (unlikely(ret)) + goto out; + + ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_TODA); + if (unlikely(ret)) + goto out; + + ret = rtc_tm_to_time(&alarm->time, &s1970); + if (unlikely(ret)) + goto out; + + dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff", + s1970); + + ret = mc13783_rtc_irq_enable_unlocked(dev, alarm->enabled, + MC13783_IRQ_TODA); + if (unlikely(ret)) + goto out; + + seconds = s1970 % 86400; + days = s1970 / 86400; + + ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAYA, days); + if (unlikely(ret)) + goto out; + + ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, seconds); + +out: + mc13783_unlock(priv->mc13783); + + return ret; +} + +static irqreturn_t mc13783_rtc_alarm_handler(int irq, void *dev) +{ + struct mc13783_rtc *priv = dev; + struct mc13783 *mc13783 = priv->mc13783; + + dev_dbg(&priv->rtc->dev, "Alarm\n"); + + rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF); + + mc13783_irq_ack(mc13783, irq); + + return IRQ_HANDLED; +} + static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev) { struct mc13783_rtc *priv = dev; @@ -131,24 +284,21 @@ static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev) static int mc13783_rtc_update_irq_enable(struct device *dev, unsigned int enabled) { - struct mc13783_rtc *priv = dev_get_drvdata(dev); - int ret = -ENODATA; - - mc13783_lock(priv->mc13783); - if (!priv->valid) - goto out; - - ret = (enabled ? mc13783_irq_unmask : mc13783_irq_mask)(priv->mc13783, - MC13783_IRQ_1HZ); -out: - mc13783_unlock(priv->mc13783); + return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_1HZ); +} - return ret; +static int mc13783_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_TODA); } static const struct rtc_class_ops mc13783_rtc_ops = { .read_time = mc13783_rtc_read_time, .set_mmss = mc13783_rtc_set_mmss, + .read_alarm = mc13783_rtc_read_alarm, + .set_alarm = mc13783_rtc_set_alarm, + .alarm_irq_enable = mc13783_rtc_alarm_irq_enable, .update_irq_enable = mc13783_rtc_update_irq_enable, }; @@ -197,11 +347,19 @@ static int __devinit mc13783_rtc_probe(struct platform_device *pdev) if (ret) goto err_update_irq_request; + ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_TODA, + mc13783_rtc_alarm_handler, DRIVER_NAME, priv); + if (ret) + goto err_alarm_irq_request; + priv->rtc = rtc_device_register(pdev->name, &pdev->dev, &mc13783_rtc_ops, THIS_MODULE); if (IS_ERR(priv->rtc)) { ret = PTR_ERR(priv->rtc); + mc13783_irq_free(priv->mc13783, MC13783_IRQ_TODA, priv); +err_alarm_irq_request: + mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv); err_update_irq_request: @@ -227,6 +385,7 @@ static int __devexit mc13783_rtc_remove(struct platform_device *pdev) rtc_device_unregister(priv->rtc); + mc13783_irq_free(priv->mc13783, MC13783_IRQ_TODA, priv); mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv); mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv); |
