Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / drivers / rtc / class.c
index 413c7d5..be5a6b7 100644 (file)
 #include <linux/kdev_t.h>
 #include <linux/idr.h>
 
+#include "rtc-core.h"
+
+
 static DEFINE_IDR(rtc_idr);
 static DEFINE_MUTEX(idr_lock);
 struct class *rtc_class;
 
-static void rtc_device_release(struct class_device *class_dev)
+static void rtc_device_release(struct device *dev)
 {
-       struct rtc_device *rtc = to_rtc_device(class_dev);
+       struct rtc_device *rtc = to_rtc_device(dev);
        mutex_lock(&idr_lock);
        idr_remove(&rtc_idr, rtc->id);
        mutex_unlock(&idr_lock);
        kfree(rtc);
 }
 
+#if defined(CONFIG_PM) && defined(CONFIG_RTC_HCTOSYS_DEVICE)
+
+/*
+ * On suspend(), measure the delta between one RTC and the
+ * system's wall clock; restore it on resume().
+ */
+
+static struct timespec delta;
+static time_t          oldtime;
+
+static int rtc_suspend(struct device *dev, pm_message_t mesg)
+{
+       struct rtc_device       *rtc = to_rtc_device(dev);
+       struct rtc_time         tm;
+       struct timespec         ts = current_kernel_time();
+
+       if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
+               return 0;
+
+       rtc_read_time(rtc, &tm);
+       rtc_tm_to_time(&tm, &oldtime);
+
+       /* RTC precision is 1 second; adjust delta for avg 1/2 sec err */
+       set_normalized_timespec(&delta,
+                               ts.tv_sec - oldtime,
+                               ts.tv_nsec - (NSEC_PER_SEC >> 1));
+
+       return 0;
+}
+
+static int rtc_resume(struct device *dev)
+{
+       struct rtc_device       *rtc = to_rtc_device(dev);
+       struct rtc_time         tm;
+       time_t                  newtime;
+       struct timespec         time;
+
+       if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
+               return 0;
+
+       rtc_read_time(rtc, &tm);
+       if (rtc_valid_tm(&tm) != 0) {
+               pr_debug("%s:  bogus resume time\n", dev_name(&rtc->dev));
+               return 0;
+       }
+       rtc_tm_to_time(&tm, &newtime);
+       if (newtime <= oldtime) {
+               if (newtime < oldtime)
+                       pr_debug("%s:  time travel!\n", dev_name(&rtc->dev));
+               return 0;
+       }
+
+       /* restore wall clock using delta against this RTC;
+        * adjust again for avg 1/2 second RTC sampling error
+        */
+       set_normalized_timespec(&time,
+                               newtime + delta.tv_sec,
+                               (NSEC_PER_SEC >> 1) + delta.tv_nsec);
+       do_settimeofday(&time);
+
+       return 0;
+}
+
+#else
+#define rtc_suspend    NULL
+#define rtc_resume     NULL
+#endif
+
+
 /**
  * rtc_device_register - register w/ RTC class
  * @dev: the device to register
@@ -39,7 +111,7 @@ static void rtc_device_release(struct class_device *class_dev)
  * Returns the pointer to the new struct class device.
  */
 struct rtc_device *rtc_device_register(const char *name, struct device *dev,
-                                       struct rtc_class_ops *ops,
+                                       const struct rtc_class_ops *ops,
                                        struct module *owner)
 {
        struct rtc_device *rtc;
@@ -69,23 +141,31 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
        rtc->id = id;
        rtc->ops = ops;
        rtc->owner = owner;
-       rtc->class_dev.dev = dev;
-       rtc->class_dev.class = rtc_class;
-       rtc->class_dev.release = rtc_device_release;
+       rtc->max_user_freq = 64;
+       rtc->dev.parent = dev;
+       rtc->dev.class = rtc_class;
+       rtc->dev.release = rtc_device_release;
 
        mutex_init(&rtc->ops_lock);
        spin_lock_init(&rtc->irq_lock);
        spin_lock_init(&rtc->irq_task_lock);
+       init_waitqueue_head(&rtc->irq_queue);
 
        strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
-       snprintf(rtc->class_dev.class_id, BUS_ID_SIZE, "rtc%d", id);
+       dev_set_name(&rtc->dev, "rtc%d", id);
 
-       err = class_device_register(&rtc->class_dev);
+       rtc_dev_prepare(rtc);
+
+       err = device_register(&rtc->dev);
        if (err)
                goto exit_kfree;
 
+       rtc_dev_add_device(rtc);
+       rtc_sysfs_add_device(rtc);
+       rtc_proc_add_device(rtc);
+
        dev_info(dev, "rtc core: registered %s as %s\n",
-                       rtc->name, rtc->class_dev.class_id);
+                       rtc->name, dev_name(&rtc->dev));
 
        return rtc;
 
@@ -93,7 +173,9 @@ exit_kfree:
        kfree(rtc);
 
 exit_idr:
+       mutex_lock(&idr_lock);
        idr_remove(&rtc_idr, id);
+       mutex_unlock(&idr_lock);
 
 exit:
        dev_err(dev, "rtc core: unable to register %s, err = %d\n",
@@ -110,20 +192,22 @@ EXPORT_SYMBOL_GPL(rtc_device_register);
  */
 void rtc_device_unregister(struct rtc_device *rtc)
 {
-       mutex_lock(&rtc->ops_lock);
-       rtc->ops = NULL;
-       mutex_unlock(&rtc->ops_lock);
-       class_device_unregister(&rtc->class_dev);
+       if (get_device(&rtc->dev) != NULL) {
+               mutex_lock(&rtc->ops_lock);
+               /* remove innards of this RTC, then disable it, before
+                * letting any rtc_class_open() users access it again
+                */
+               rtc_sysfs_del_device(rtc);
+               rtc_dev_del_device(rtc);
+               rtc_proc_del_device(rtc);
+               device_unregister(&rtc->dev);
+               rtc->ops = NULL;
+               mutex_unlock(&rtc->ops_lock);
+               put_device(&rtc->dev);
+       }
 }
 EXPORT_SYMBOL_GPL(rtc_device_unregister);
 
-int rtc_interface_register(struct class_interface *intf)
-{
-       intf->class = rtc_class;
-       return class_interface_register(intf);
-}
-EXPORT_SYMBOL_GPL(rtc_interface_register);
-
 static int __init rtc_init(void)
 {
        rtc_class = class_create(THIS_MODULE, "rtc");
@@ -131,17 +215,22 @@ static int __init rtc_init(void)
                printk(KERN_ERR "%s: couldn't create class\n", __FILE__);
                return PTR_ERR(rtc_class);
        }
+       rtc_class->suspend = rtc_suspend;
+       rtc_class->resume = rtc_resume;
+       rtc_dev_init();
+       rtc_sysfs_init(rtc_class);
        return 0;
 }
 
 static void __exit rtc_exit(void)
 {
+       rtc_dev_exit();
        class_destroy(rtc_class);
 }
 
-module_init(rtc_init);
+subsys_initcall(rtc_init);
 module_exit(rtc_exit);
 
-MODULE_AUTHOR("Alessandro Zummo <a.zummo@towerteh.it>");
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("RTC class support");
 MODULE_LICENSE("GPL");