diff options
Diffstat (limited to 'drivers/rtc/rtc-mc13783.c')
| -rw-r--r-- | drivers/rtc/rtc-mc13783.c | 428 |
1 files changed, 0 insertions, 428 deletions
diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c deleted file mode 100644 index 675bfb515367..000000000000 --- a/drivers/rtc/rtc-mc13783.c +++ /dev/null @@ -1,428 +0,0 @@ -/* - * Real Time Clock driver for Freescale MC13783 PMIC - * - * (C) 2009 Sascha Hauer, Pengutronix - * (C) 2009 Uwe Kleine-Koenig, Pengutronix - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/mfd/mc13783.h> -#include <linux/platform_device.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/rtc.h> - -#define DRIVER_NAME "mc13783-rtc" - -#define MC13783_RTCTOD 20 -#define MC13783_RTCTODA 21 -#define MC13783_RTCDAY 22 -#define MC13783_RTCDAYA 23 - -struct mc13783_rtc { - struct rtc_device *rtc; - struct mc13783 *mc13783; - 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); - unsigned int seconds, days1, days2; - unsigned long s1970; - int ret; - - mc13783_lock(priv->mc13783); - - if (!priv->valid) { - ret = -ENODATA; - goto out; - } - - ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days1); - if (unlikely(ret)) - goto out; - - ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTOD, &seconds); - if (unlikely(ret)) - goto out; - - ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days2); -out: - mc13783_unlock(priv->mc13783); - - if (ret) - return ret; - - if (days2 == days1 + 1) { - if (seconds >= 86400 / 2) - days2 = days1; - else - days1 = days2; - } - - if (days1 != days2) - return -EIO; - - s1970 = days1 * 86400 + seconds; - - rtc_time_to_tm(s1970, tm); - - return rtc_valid_tm(tm); -} - -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; - days = secs / 86400; - - mc13783_lock(priv->mc13783); - - /* - * 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); - if (unlikely(ret)) - goto out; - - ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAY, days); - if (unlikely(ret)) - goto out; - - ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, seconds); - 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; - - ret = mc13783_irq_unmask(priv->mc13783, MC13783_IRQ_RTCRST); -out: - priv->valid = !ret; - - mc13783_unlock(priv->mc13783); - - 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; - struct mc13783 *mc13783 = priv->mc13783; - - dev_dbg(&priv->rtc->dev, "1HZ\n"); - - rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF); - - mc13783_irq_ack(mc13783, irq); - - return IRQ_HANDLED; -} - -static int mc13783_rtc_update_irq_enable(struct device *dev, - unsigned int enabled) -{ - return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_1HZ); -} - -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, -}; - -static irqreturn_t mc13783_rtc_reset_handler(int irq, void *dev) -{ - struct mc13783_rtc *priv = dev; - struct mc13783 *mc13783 = priv->mc13783; - - dev_dbg(&priv->rtc->dev, "RTCRST\n"); - priv->valid = 0; - - mc13783_irq_mask(mc13783, irq); - - return IRQ_HANDLED; -} - -static int __devinit mc13783_rtc_probe(struct platform_device *pdev) -{ - int ret; - struct mc13783_rtc *priv; - struct mc13783 *mc13783; - int rtcrst_pending; - - priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - mc13783 = dev_get_drvdata(pdev->dev.parent); - priv->mc13783 = mc13783; - - platform_set_drvdata(pdev, priv); - - mc13783_lock(mc13783); - - ret = mc13783_irq_request(mc13783, MC13783_IRQ_RTCRST, - mc13783_rtc_reset_handler, DRIVER_NAME, priv); - if (ret) - goto err_reset_irq_request; - - ret = mc13783_irq_status(mc13783, MC13783_IRQ_RTCRST, - NULL, &rtcrst_pending); - if (ret) - goto err_reset_irq_status; - - priv->valid = !rtcrst_pending; - - ret = mc13783_irq_request_nounmask(mc13783, MC13783_IRQ_1HZ, - mc13783_rtc_update_handler, DRIVER_NAME, priv); - if (ret) - goto err_update_irq_request; - - ret = mc13783_irq_request_nounmask(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(mc13783, MC13783_IRQ_TODA, priv); -err_alarm_irq_request: - - mc13783_irq_free(mc13783, MC13783_IRQ_1HZ, priv); -err_update_irq_request: - -err_reset_irq_status: - - mc13783_irq_free(mc13783, MC13783_IRQ_RTCRST, priv); -err_reset_irq_request: - - platform_set_drvdata(pdev, NULL); - kfree(priv); - } - - mc13783_unlock(mc13783); - - return ret; -} - -static int __devexit mc13783_rtc_remove(struct platform_device *pdev) -{ - struct mc13783_rtc *priv = platform_get_drvdata(pdev); - - mc13783_lock(priv->mc13783); - - 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); - - mc13783_unlock(priv->mc13783); - - platform_set_drvdata(pdev, NULL); - - kfree(priv); - - return 0; -} - -static struct platform_driver mc13783_rtc_driver = { - .remove = __devexit_p(mc13783_rtc_remove), - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init mc13783_rtc_init(void) -{ - return platform_driver_probe(&mc13783_rtc_driver, &mc13783_rtc_probe); -} -module_init(mc13783_rtc_init); - -static void __exit mc13783_rtc_exit(void) -{ - platform_driver_unregister(&mc13783_rtc_driver); -} -module_exit(mc13783_rtc_exit); - -MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); -MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS("platform:" DRIVER_NAME); |