Alessandro Zummo | 728a294 | 2006-03-27 01:16:40 -0800 | [diff] [blame] | 1 | /* |
| 2 | * RTC subsystem, proc interface |
| 3 | * |
| 4 | * Copyright (C) 2005-06 Tower Technologies |
| 5 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
| 6 | * |
| 7 | * based on arch/arm/common/rtctime.c |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/rtc.h> |
| 16 | #include <linux/proc_fs.h> |
| 17 | #include <linux/seq_file.h> |
| 18 | |
| 19 | static struct class_device *rtc_dev = NULL; |
| 20 | static DEFINE_MUTEX(rtc_lock); |
| 21 | |
| 22 | static int rtc_proc_show(struct seq_file *seq, void *offset) |
| 23 | { |
| 24 | int err; |
| 25 | struct class_device *class_dev = seq->private; |
| 26 | struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops; |
| 27 | struct rtc_wkalrm alrm; |
| 28 | struct rtc_time tm; |
| 29 | |
| 30 | err = rtc_read_time(class_dev, &tm); |
| 31 | if (err == 0) { |
| 32 | seq_printf(seq, |
| 33 | "rtc_time\t: %02d:%02d:%02d\n" |
| 34 | "rtc_date\t: %04d-%02d-%02d\n", |
| 35 | tm.tm_hour, tm.tm_min, tm.tm_sec, |
| 36 | tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday); |
| 37 | } |
| 38 | |
| 39 | err = rtc_read_alarm(class_dev, &alrm); |
| 40 | if (err == 0) { |
| 41 | seq_printf(seq, "alrm_time\t: "); |
| 42 | if ((unsigned int)alrm.time.tm_hour <= 24) |
| 43 | seq_printf(seq, "%02d:", alrm.time.tm_hour); |
| 44 | else |
| 45 | seq_printf(seq, "**:"); |
| 46 | if ((unsigned int)alrm.time.tm_min <= 59) |
| 47 | seq_printf(seq, "%02d:", alrm.time.tm_min); |
| 48 | else |
| 49 | seq_printf(seq, "**:"); |
| 50 | if ((unsigned int)alrm.time.tm_sec <= 59) |
| 51 | seq_printf(seq, "%02d\n", alrm.time.tm_sec); |
| 52 | else |
| 53 | seq_printf(seq, "**\n"); |
| 54 | |
| 55 | seq_printf(seq, "alrm_date\t: "); |
| 56 | if ((unsigned int)alrm.time.tm_year <= 200) |
| 57 | seq_printf(seq, "%04d-", alrm.time.tm_year + 1900); |
| 58 | else |
| 59 | seq_printf(seq, "****-"); |
| 60 | if ((unsigned int)alrm.time.tm_mon <= 11) |
| 61 | seq_printf(seq, "%02d-", alrm.time.tm_mon + 1); |
| 62 | else |
| 63 | seq_printf(seq, "**-"); |
| 64 | if ((unsigned int)alrm.time.tm_mday <= 31) |
| 65 | seq_printf(seq, "%02d\n", alrm.time.tm_mday); |
| 66 | else |
| 67 | seq_printf(seq, "**\n"); |
| 68 | seq_printf(seq, "alrm_wakeup\t: %s\n", |
| 69 | alrm.enabled ? "yes" : "no"); |
| 70 | seq_printf(seq, "alrm_pending\t: %s\n", |
| 71 | alrm.pending ? "yes" : "no"); |
| 72 | } |
| 73 | |
| 74 | if (ops->proc) |
| 75 | ops->proc(class_dev->dev, seq); |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int rtc_proc_open(struct inode *inode, struct file *file) |
| 81 | { |
| 82 | struct class_device *class_dev = PDE(inode)->data; |
| 83 | |
| 84 | if (!try_module_get(THIS_MODULE)) |
| 85 | return -ENODEV; |
| 86 | |
| 87 | return single_open(file, rtc_proc_show, class_dev); |
| 88 | } |
| 89 | |
| 90 | static int rtc_proc_release(struct inode *inode, struct file *file) |
| 91 | { |
| 92 | int res = single_release(inode, file); |
| 93 | module_put(THIS_MODULE); |
| 94 | return res; |
| 95 | } |
| 96 | |
| 97 | static struct file_operations rtc_proc_fops = { |
| 98 | .open = rtc_proc_open, |
| 99 | .read = seq_read, |
| 100 | .llseek = seq_lseek, |
| 101 | .release = rtc_proc_release, |
| 102 | }; |
| 103 | |
| 104 | static int rtc_proc_add_device(struct class_device *class_dev, |
| 105 | struct class_interface *class_intf) |
| 106 | { |
| 107 | mutex_lock(&rtc_lock); |
| 108 | if (rtc_dev == NULL) { |
| 109 | struct proc_dir_entry *ent; |
| 110 | |
| 111 | rtc_dev = class_dev; |
| 112 | |
| 113 | ent = create_proc_entry("driver/rtc", 0, NULL); |
| 114 | if (ent) { |
| 115 | struct rtc_device *rtc = to_rtc_device(class_dev); |
| 116 | |
| 117 | ent->proc_fops = &rtc_proc_fops; |
| 118 | ent->owner = rtc->owner; |
| 119 | ent->data = class_dev; |
| 120 | |
| 121 | dev_info(class_dev->dev, "rtc intf: proc\n"); |
| 122 | } |
| 123 | else |
| 124 | rtc_dev = NULL; |
| 125 | } |
| 126 | mutex_unlock(&rtc_lock); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static void rtc_proc_remove_device(struct class_device *class_dev, |
| 132 | struct class_interface *class_intf) |
| 133 | { |
| 134 | mutex_lock(&rtc_lock); |
| 135 | if (rtc_dev == class_dev) { |
| 136 | remove_proc_entry("driver/rtc", NULL); |
| 137 | rtc_dev = NULL; |
| 138 | } |
| 139 | mutex_unlock(&rtc_lock); |
| 140 | } |
| 141 | |
| 142 | static struct class_interface rtc_proc_interface = { |
| 143 | .add = &rtc_proc_add_device, |
| 144 | .remove = &rtc_proc_remove_device, |
| 145 | }; |
| 146 | |
| 147 | static int __init rtc_proc_init(void) |
| 148 | { |
| 149 | return rtc_interface_register(&rtc_proc_interface); |
| 150 | } |
| 151 | |
| 152 | static void __exit rtc_proc_exit(void) |
| 153 | { |
| 154 | class_interface_unregister(&rtc_proc_interface); |
| 155 | } |
| 156 | |
| 157 | module_init(rtc_proc_init); |
| 158 | module_exit(rtc_proc_exit); |
| 159 | |
| 160 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
| 161 | MODULE_DESCRIPTION("RTC class proc interface"); |
| 162 | MODULE_LICENSE("GPL"); |