1 /* 2 * An RTC test device/driver 3 * Copyright (C) 2005 Tower Technologies 4 * Author: Alessandro Zummo <a.zummo@towertech.it> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/err.h> 13 #include <linux/rtc.h> 14 #include <linux/platform_device.h> 15 16 static int test_mmss64; 17 module_param(test_mmss64, int, 0644); 18 MODULE_PARM_DESC(test_mmss64, "Test struct rtc_class_ops.set_mmss64()."); 19 20 static struct platform_device *test0 = NULL, *test1 = NULL; 21 22 static int test_rtc_read_alarm(struct device *dev, 23 struct rtc_wkalrm *alrm) 24 { 25 return 0; 26 } 27 28 static int test_rtc_set_alarm(struct device *dev, 29 struct rtc_wkalrm *alrm) 30 { 31 return 0; 32 } 33 34 static int test_rtc_read_time(struct device *dev, 35 struct rtc_time *tm) 36 { 37 rtc_time64_to_tm(ktime_get_real_seconds(), tm); 38 return 0; 39 } 40 41 static int test_rtc_set_mmss64(struct device *dev, time64_t secs) 42 { 43 dev_info(dev, "%s, secs = %lld\n", __func__, (long long)secs); 44 return 0; 45 } 46 47 static int test_rtc_set_mmss(struct device *dev, unsigned long secs) 48 { 49 dev_info(dev, "%s, secs = %lu\n", __func__, secs); 50 return 0; 51 } 52 53 static int test_rtc_proc(struct device *dev, struct seq_file *seq) 54 { 55 struct platform_device *plat_dev = to_platform_device(dev); 56 57 seq_printf(seq, "test\t\t: yes\n"); 58 seq_printf(seq, "id\t\t: %d\n", plat_dev->id); 59 60 return 0; 61 } 62 63 static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) 64 { 65 return 0; 66 } 67 68 static struct rtc_class_ops test_rtc_ops = { 69 .proc = test_rtc_proc, 70 .read_time = test_rtc_read_time, 71 .read_alarm = test_rtc_read_alarm, 72 .set_alarm = test_rtc_set_alarm, 73 .set_mmss = test_rtc_set_mmss, 74 .alarm_irq_enable = test_rtc_alarm_irq_enable, 75 }; 76 77 static ssize_t test_irq_show(struct device *dev, 78 struct device_attribute *attr, char *buf) 79 { 80 return sprintf(buf, "%d\n", 42); 81 } 82 static ssize_t test_irq_store(struct device *dev, 83 struct device_attribute *attr, 84 const char *buf, size_t count) 85 { 86 int retval; 87 struct platform_device *plat_dev = to_platform_device(dev); 88 struct rtc_device *rtc = platform_get_drvdata(plat_dev); 89 90 retval = count; 91 if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled) 92 rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF); 93 else if (strncmp(buf, "alarm", 5) == 0) { 94 struct rtc_wkalrm alrm; 95 int err = rtc_read_alarm(rtc, &alrm); 96 97 if (!err && alrm.enabled) 98 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); 99 100 } else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled) 101 rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF); 102 else 103 retval = -EINVAL; 104 105 return retval; 106 } 107 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store); 108 109 static int test_probe(struct platform_device *plat_dev) 110 { 111 int err; 112 struct rtc_device *rtc; 113 114 if (test_mmss64) { 115 test_rtc_ops.set_mmss64 = test_rtc_set_mmss64; 116 test_rtc_ops.set_mmss = NULL; 117 } 118 119 rtc = devm_rtc_device_register(&plat_dev->dev, "test", 120 &test_rtc_ops, THIS_MODULE); 121 if (IS_ERR(rtc)) { 122 return PTR_ERR(rtc); 123 } 124 125 err = device_create_file(&plat_dev->dev, &dev_attr_irq); 126 if (err) 127 dev_err(&plat_dev->dev, "Unable to create sysfs entry: %s\n", 128 dev_attr_irq.attr.name); 129 130 platform_set_drvdata(plat_dev, rtc); 131 132 return 0; 133 } 134 135 static int test_remove(struct platform_device *plat_dev) 136 { 137 device_remove_file(&plat_dev->dev, &dev_attr_irq); 138 139 return 0; 140 } 141 142 static struct platform_driver test_driver = { 143 .probe = test_probe, 144 .remove = test_remove, 145 .driver = { 146 .name = "rtc-test", 147 }, 148 }; 149 150 static int __init test_init(void) 151 { 152 int err; 153 154 if ((err = platform_driver_register(&test_driver))) 155 return err; 156 157 if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) { 158 err = -ENOMEM; 159 goto exit_driver_unregister; 160 } 161 162 if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) { 163 err = -ENOMEM; 164 goto exit_put_test0; 165 } 166 167 if ((err = platform_device_add(test0))) 168 goto exit_put_test1; 169 170 if ((err = platform_device_add(test1))) 171 goto exit_del_test0; 172 173 return 0; 174 175 exit_del_test0: 176 platform_device_del(test0); 177 178 exit_put_test1: 179 platform_device_put(test1); 180 181 exit_put_test0: 182 platform_device_put(test0); 183 184 exit_driver_unregister: 185 platform_driver_unregister(&test_driver); 186 return err; 187 } 188 189 static void __exit test_exit(void) 190 { 191 platform_device_unregister(test0); 192 platform_device_unregister(test1); 193 platform_driver_unregister(&test_driver); 194 } 195 196 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 197 MODULE_DESCRIPTION("RTC test driver/device"); 198 MODULE_LICENSE("GPL"); 199 200 module_init(test_init); 201 module_exit(test_exit); 202