[PATCH] RTC subsystem: proc interface
Add the proc interface to the RTC subsystem.
The first RTC driver which registers with the class will be accessible by
/proc/driver/rtc .
This is required for compatibility with the standard RTC driver and to avoid
breaking any user space application which may erroneusly rely on this.
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/rtc/rtc-proc.c b/drivers/rtc/rtc-proc.c
new file mode 100644
index 0000000..90b8a97
--- /dev/null
+++ b/drivers/rtc/rtc-proc.c
@@ -0,0 +1,162 @@
+/*
+ * RTC subsystem, proc interface
+ *
+ * Copyright (C) 2005-06 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * based on arch/arm/common/rtctime.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/proc_fs.h>
+#include <linux/seq_file.h>
+
+static struct class_device *rtc_dev = NULL;
+static DEFINE_MUTEX(rtc_lock);
+
+static int rtc_proc_show(struct seq_file *seq, void *offset)
+{
+ int err;
+ struct class_device *class_dev = seq->private;
+ struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
+ struct rtc_wkalrm alrm;
+ struct rtc_time tm;
+
+ err = rtc_read_time(class_dev, &tm);
+ if (err == 0) {
+ seq_printf(seq,
+ "rtc_time\t: %02d:%02d:%02d\n"
+ "rtc_date\t: %04d-%02d-%02d\n",
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+ }
+
+ err = rtc_read_alarm(class_dev, &alrm);
+ if (err == 0) {
+ seq_printf(seq, "alrm_time\t: ");
+ if ((unsigned int)alrm.time.tm_hour <= 24)
+ seq_printf(seq, "%02d:", alrm.time.tm_hour);
+ else
+ seq_printf(seq, "**:");
+ if ((unsigned int)alrm.time.tm_min <= 59)
+ seq_printf(seq, "%02d:", alrm.time.tm_min);
+ else
+ seq_printf(seq, "**:");
+ if ((unsigned int)alrm.time.tm_sec <= 59)
+ seq_printf(seq, "%02d\n", alrm.time.tm_sec);
+ else
+ seq_printf(seq, "**\n");
+
+ seq_printf(seq, "alrm_date\t: ");
+ if ((unsigned int)alrm.time.tm_year <= 200)
+ seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
+ else
+ seq_printf(seq, "****-");
+ if ((unsigned int)alrm.time.tm_mon <= 11)
+ seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
+ else
+ seq_printf(seq, "**-");
+ if ((unsigned int)alrm.time.tm_mday <= 31)
+ seq_printf(seq, "%02d\n", alrm.time.tm_mday);
+ else
+ seq_printf(seq, "**\n");
+ seq_printf(seq, "alrm_wakeup\t: %s\n",
+ alrm.enabled ? "yes" : "no");
+ seq_printf(seq, "alrm_pending\t: %s\n",
+ alrm.pending ? "yes" : "no");
+ }
+
+ if (ops->proc)
+ ops->proc(class_dev->dev, seq);
+
+ return 0;
+}
+
+static int rtc_proc_open(struct inode *inode, struct file *file)
+{
+ struct class_device *class_dev = PDE(inode)->data;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ return single_open(file, rtc_proc_show, class_dev);
+}
+
+static int rtc_proc_release(struct inode *inode, struct file *file)
+{
+ int res = single_release(inode, file);
+ module_put(THIS_MODULE);
+ return res;
+}
+
+static struct file_operations rtc_proc_fops = {
+ .open = rtc_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = rtc_proc_release,
+};
+
+static int rtc_proc_add_device(struct class_device *class_dev,
+ struct class_interface *class_intf)
+{
+ mutex_lock(&rtc_lock);
+ if (rtc_dev == NULL) {
+ struct proc_dir_entry *ent;
+
+ rtc_dev = class_dev;
+
+ ent = create_proc_entry("driver/rtc", 0, NULL);
+ if (ent) {
+ struct rtc_device *rtc = to_rtc_device(class_dev);
+
+ ent->proc_fops = &rtc_proc_fops;
+ ent->owner = rtc->owner;
+ ent->data = class_dev;
+
+ dev_info(class_dev->dev, "rtc intf: proc\n");
+ }
+ else
+ rtc_dev = NULL;
+ }
+ mutex_unlock(&rtc_lock);
+
+ return 0;
+}
+
+static void rtc_proc_remove_device(struct class_device *class_dev,
+ struct class_interface *class_intf)
+{
+ mutex_lock(&rtc_lock);
+ if (rtc_dev == class_dev) {
+ remove_proc_entry("driver/rtc", NULL);
+ rtc_dev = NULL;
+ }
+ mutex_unlock(&rtc_lock);
+}
+
+static struct class_interface rtc_proc_interface = {
+ .add = &rtc_proc_add_device,
+ .remove = &rtc_proc_remove_device,
+};
+
+static int __init rtc_proc_init(void)
+{
+ return rtc_interface_register(&rtc_proc_interface);
+}
+
+static void __exit rtc_proc_exit(void)
+{
+ class_interface_unregister(&rtc_proc_interface);
+}
+
+module_init(rtc_proc_init);
+module_exit(rtc_proc_exit);
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("RTC class proc interface");
+MODULE_LICENSE("GPL");