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