1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * RTC subsystem, proc interface 4 * 5 * Copyright (C) 2005-06 Tower Technologies 6 * Author: Alessandro Zummo <a.zummo@towertech.it> 7 * 8 * based on arch/arm/common/rtctime.c 9 */ 10 11 #include <linux/module.h> 12 #include <linux/rtc.h> 13 #include <linux/proc_fs.h> 14 #include <linux/seq_file.h> 15 16 #include "rtc-core.h" 17 18 #define NAME_SIZE 10 19 20 #if defined(CONFIG_RTC_HCTOSYS_DEVICE) 21 static bool is_rtc_hctosys(struct rtc_device *rtc) 22 { 23 int size; 24 char name[NAME_SIZE]; 25 26 size = scnprintf(name, NAME_SIZE, "rtc%d", rtc->id); 27 if (size > NAME_SIZE) 28 return false; 29 30 return !strncmp(name, CONFIG_RTC_HCTOSYS_DEVICE, NAME_SIZE); 31 } 32 #else 33 static bool is_rtc_hctosys(struct rtc_device *rtc) 34 { 35 return (rtc->id == 0); 36 } 37 #endif 38 39 static int rtc_proc_show(struct seq_file *seq, void *offset) 40 { 41 int err; 42 struct rtc_device *rtc = seq->private; 43 const struct rtc_class_ops *ops = rtc->ops; 44 struct rtc_wkalrm alrm; 45 struct rtc_time tm; 46 47 err = rtc_read_time(rtc, &tm); 48 if (err == 0) { 49 seq_printf(seq, 50 "rtc_time\t: %ptRt\n" 51 "rtc_date\t: %ptRd\n", 52 &tm, &tm); 53 } 54 55 err = rtc_read_alarm(rtc, &alrm); 56 if (err == 0) { 57 seq_printf(seq, "alrm_time\t: %ptRt\n", &alrm.time); 58 seq_printf(seq, "alrm_date\t: %ptRd\n", &alrm.time); 59 seq_printf(seq, "alarm_IRQ\t: %s\n", 60 alrm.enabled ? "yes" : "no"); 61 seq_printf(seq, "alrm_pending\t: %s\n", 62 alrm.pending ? "yes" : "no"); 63 seq_printf(seq, "update IRQ enabled\t: %s\n", 64 (rtc->uie_rtctimer.enabled) ? "yes" : "no"); 65 seq_printf(seq, "periodic IRQ enabled\t: %s\n", 66 (rtc->pie_enabled) ? "yes" : "no"); 67 seq_printf(seq, "periodic IRQ frequency\t: %d\n", 68 rtc->irq_freq); 69 seq_printf(seq, "max user IRQ frequency\t: %d\n", 70 rtc->max_user_freq); 71 } 72 73 seq_printf(seq, "24hr\t\t: yes\n"); 74 75 if (ops->proc) 76 ops->proc(rtc->dev.parent, seq); 77 78 return 0; 79 } 80 81 void rtc_proc_add_device(struct rtc_device *rtc) 82 { 83 if (is_rtc_hctosys(rtc)) 84 proc_create_single_data("driver/rtc", 0, NULL, rtc_proc_show, 85 rtc); 86 } 87 88 void rtc_proc_del_device(struct rtc_device *rtc) 89 { 90 if (is_rtc_hctosys(rtc)) 91 remove_proc_entry("driver/rtc", NULL); 92 } 93