| /* |
| * RTC subsystem, base class |
| * |
| * Copyright (C) 2005 Tower Technologies |
| * Author: Alessandro Zummo <a.zummo@towertech.it> |
| * |
| * class skeleton from drivers/hwmon/hwmon.c |
| * |
| * 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/module.h> |
| #include <linux/rtc.h> |
| #include <linux/kdev_t.h> |
| #include <linux/idr.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) |
| { |
| struct rtc_device *rtc = to_rtc_device(class_dev); |
| mutex_lock(&idr_lock); |
| idr_remove(&rtc_idr, rtc->id); |
| mutex_unlock(&idr_lock); |
| kfree(rtc); |
| } |
| |
| /** |
| * rtc_device_register - register w/ RTC class |
| * @dev: the device to register |
| * |
| * rtc_device_unregister() must be called when the class device is no |
| * longer needed. |
| * |
| * 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, |
| struct module *owner) |
| { |
| struct rtc_device *rtc; |
| int id, err; |
| |
| if (idr_pre_get(&rtc_idr, GFP_KERNEL) == 0) { |
| err = -ENOMEM; |
| goto exit; |
| } |
| |
| |
| mutex_lock(&idr_lock); |
| err = idr_get_new(&rtc_idr, NULL, &id); |
| mutex_unlock(&idr_lock); |
| |
| if (err < 0) |
| goto exit; |
| |
| id = id & MAX_ID_MASK; |
| |
| rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL); |
| if (rtc == NULL) { |
| err = -ENOMEM; |
| goto exit_idr; |
| } |
| |
| 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; |
| |
| mutex_init(&rtc->ops_lock); |
| spin_lock_init(&rtc->irq_lock); |
| spin_lock_init(&rtc->irq_task_lock); |
| |
| strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE); |
| snprintf(rtc->class_dev.class_id, BUS_ID_SIZE, "rtc%d", id); |
| |
| err = class_device_register(&rtc->class_dev); |
| if (err) |
| goto exit_kfree; |
| |
| dev_info(dev, "rtc core: registered %s as %s\n", |
| rtc->name, rtc->class_dev.class_id); |
| |
| return rtc; |
| |
| exit_kfree: |
| kfree(rtc); |
| |
| exit_idr: |
| idr_remove(&rtc_idr, id); |
| |
| exit: |
| return ERR_PTR(err); |
| } |
| EXPORT_SYMBOL_GPL(rtc_device_register); |
| |
| |
| /** |
| * rtc_device_unregister - removes the previously registered RTC class device |
| * |
| * @rtc: the RTC class device to destroy |
| */ |
| 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); |
| } |
| 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"); |
| if (IS_ERR(rtc_class)) { |
| printk(KERN_ERR "%s: couldn't create class\n", __FILE__); |
| return PTR_ERR(rtc_class); |
| } |
| return 0; |
| } |
| |
| static void __exit rtc_exit(void) |
| { |
| class_destroy(rtc_class); |
| } |
| |
| module_init(rtc_init); |
| module_exit(rtc_exit); |
| |
| MODULE_AUTHOR("Alessandro Zummo <a.zummo@towerteh.it>"); |
| MODULE_DESCRIPTION("RTC class support"); |
| MODULE_LICENSE("GPL"); |