diff options
Diffstat (limited to 'drivers/rtc/rtc-sysfs.c')
| -rw-r--r-- | drivers/rtc/rtc-sysfs.c | 129 |
1 files changed, 50 insertions, 79 deletions
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c index 899ab8c514f..69df94b4484 100644 --- a/drivers/rtc/rtc-sysfs.c +++ b/drivers/rtc/rtc-sysfs.c @@ -12,20 +12,26 @@ #include <linux/module.h> #include <linux/rtc.h> +#include "rtc-core.h" + + /* device attributes */ -static ssize_t rtc_sysfs_show_name(struct class_device *dev, char *buf) +static ssize_t +rtc_sysfs_show_name(struct device *dev, struct device_attribute *attr, + char *buf) { return sprintf(buf, "%s\n", to_rtc_device(dev)->name); } -static CLASS_DEVICE_ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL); -static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf) +static ssize_t +rtc_sysfs_show_date(struct device *dev, struct device_attribute *attr, + char *buf) { ssize_t retval; struct rtc_time tm; - retval = rtc_read_time(dev, &tm); + retval = rtc_read_time(to_rtc_device(dev), &tm); if (retval == 0) { retval = sprintf(buf, "%04d-%02d-%02d\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); @@ -33,14 +39,15 @@ static ssize_t rtc_sysfs_show_date(struct class_device *dev, char *buf) return retval; } -static CLASS_DEVICE_ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL); -static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf) +static ssize_t +rtc_sysfs_show_time(struct device *dev, struct device_attribute *attr, + char *buf) { ssize_t retval; struct rtc_time tm; - retval = rtc_read_time(dev, &tm); + retval = rtc_read_time(to_rtc_device(dev), &tm); if (retval == 0) { retval = sprintf(buf, "%02d:%02d:%02d\n", tm.tm_hour, tm.tm_min, tm.tm_sec); @@ -48,14 +55,15 @@ static ssize_t rtc_sysfs_show_time(struct class_device *dev, char *buf) return retval; } -static CLASS_DEVICE_ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL); -static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf) +static ssize_t +rtc_sysfs_show_since_epoch(struct device *dev, struct device_attribute *attr, + char *buf) { ssize_t retval; struct rtc_time tm; - retval = rtc_read_time(dev, &tm); + retval = rtc_read_time(to_rtc_device(dev), &tm); if (retval == 0) { unsigned long time; rtc_tm_to_time(&tm, &time); @@ -64,23 +72,18 @@ static ssize_t rtc_sysfs_show_since_epoch(struct class_device *dev, char *buf) return retval; } -static CLASS_DEVICE_ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL); - -static struct attribute *rtc_attrs[] = { - &class_device_attr_name.attr, - &class_device_attr_date.attr, - &class_device_attr_time.attr, - &class_device_attr_since_epoch.attr, - NULL, -}; -static struct attribute_group rtc_attr_group = { - .attrs = rtc_attrs, +static struct device_attribute rtc_attrs[] = { + __ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL), + __ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL), + __ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL), + __ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL), + { }, }; - static ssize_t -rtc_sysfs_show_wakealarm(struct class_device *dev, char *buf) +rtc_sysfs_show_wakealarm(struct device *dev, struct device_attribute *attr, + char *buf) { ssize_t retval; unsigned long alarm; @@ -94,7 +97,7 @@ rtc_sysfs_show_wakealarm(struct class_device *dev, char *buf) * REVISIT maybe we should require RTC implementations to * disable the RTC alarm after it triggers, for uniformity. */ - retval = rtc_read_alarm(dev, &alm); + retval = rtc_read_alarm(to_rtc_device(dev), &alm); if (retval == 0 && alm.enabled) { rtc_tm_to_time(&alm.time, &alarm); retval = sprintf(buf, "%lu\n", alarm); @@ -104,16 +107,18 @@ rtc_sysfs_show_wakealarm(struct class_device *dev, char *buf) } static ssize_t -rtc_sysfs_set_wakealarm(struct class_device *dev, const char *buf, size_t n) +rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr, + const char *buf, size_t n) { ssize_t retval; unsigned long now, alarm; struct rtc_wkalrm alm; + struct rtc_device *rtc = to_rtc_device(dev); /* Only request alarms that trigger in the future. Disable them * by writing another time, e.g. 0 meaning Jan 1 1970 UTC. */ - retval = rtc_read_time(dev, &alm.time); + retval = rtc_read_time(rtc, &alm.time); if (retval < 0) return retval; rtc_tm_to_time(&alm.time, &now); @@ -124,7 +129,7 @@ rtc_sysfs_set_wakealarm(struct class_device *dev, const char *buf, size_t n) * entirely prevent that here, without even the minimal * locking from the /dev/rtcN api. */ - retval = rtc_read_alarm(dev, &alm); + retval = rtc_read_alarm(rtc, &alm); if (retval < 0) return retval; if (alm.enabled) @@ -141,10 +146,10 @@ rtc_sysfs_set_wakealarm(struct class_device *dev, const char *buf, size_t n) } rtc_time_to_tm(alarm, &alm.time); - retval = rtc_set_alarm(dev, &alm); + retval = rtc_set_alarm(rtc, &alm); return (retval < 0) ? retval : n; } -static const CLASS_DEVICE_ATTR(wakealarm, S_IRUGO | S_IWUSR, +static DEVICE_ATTR(wakealarm, S_IRUGO | S_IWUSR, rtc_sysfs_show_wakealarm, rtc_sysfs_set_wakealarm); @@ -153,71 +158,37 @@ static const CLASS_DEVICE_ATTR(wakealarm, S_IRUGO | S_IWUSR, * suspend-to-disk. So: no attribute unless that side effect is possible. * (Userspace may disable that mechanism later.) */ -static inline int rtc_does_wakealarm(struct class_device *class_dev) +static inline int rtc_does_wakealarm(struct rtc_device *rtc) { - struct rtc_device *rtc; - - if (!device_can_wakeup(class_dev->dev)) + if (!device_can_wakeup(rtc->dev.parent)) return 0; - rtc = to_rtc_device(class_dev); return rtc->ops->set_alarm != NULL; } -static int rtc_sysfs_add_device(struct class_device *class_dev, - struct class_interface *class_intf) +void rtc_sysfs_add_device(struct rtc_device *rtc) { int err; - dev_dbg(class_dev->dev, "rtc intf: sysfs\n"); + /* not all RTCs support both alarms and wakeup */ + if (!rtc_does_wakealarm(rtc)) + return; - err = sysfs_create_group(&class_dev->kobj, &rtc_attr_group); + err = device_create_file(&rtc->dev, &dev_attr_wakealarm); if (err) - dev_err(class_dev->dev, "failed to create %s\n", - "sysfs attributes"); - else if (rtc_does_wakealarm(class_dev)) { - /* not all RTCs support both alarms and wakeup */ - err = class_device_create_file(class_dev, - &class_device_attr_wakealarm); - if (err) { - dev_err(class_dev->dev, "failed to create %s\n", - "alarm attribute"); - sysfs_remove_group(&class_dev->kobj, &rtc_attr_group); - } - } - - return err; + dev_err(rtc->dev.parent, "failed to create " + "alarm attribute, %d", + err); } -static void rtc_sysfs_remove_device(struct class_device *class_dev, - struct class_interface *class_intf) +void rtc_sysfs_del_device(struct rtc_device *rtc) { - if (rtc_does_wakealarm(class_dev)) - class_device_remove_file(class_dev, - &class_device_attr_wakealarm); - sysfs_remove_group(&class_dev->kobj, &rtc_attr_group); + /* REVISIT did we add it successfully? */ + if (rtc_does_wakealarm(rtc)) + device_remove_file(&rtc->dev, &dev_attr_wakealarm); } -/* interface registration */ - -static struct class_interface rtc_sysfs_interface = { - .add = &rtc_sysfs_add_device, - .remove = &rtc_sysfs_remove_device, -}; - -static int __init rtc_sysfs_init(void) +void __init rtc_sysfs_init(struct class *rtc_class) { - return rtc_interface_register(&rtc_sysfs_interface); + rtc_class->dev_attrs = rtc_attrs; } - -static void __exit rtc_sysfs_exit(void) -{ - class_interface_unregister(&rtc_sysfs_interface); -} - -subsys_initcall(rtc_sysfs_init); -module_exit(rtc_sysfs_exit); - -MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); -MODULE_DESCRIPTION("RTC class sysfs interface"); -MODULE_LICENSE("GPL"); |