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 err = PTR_ERR(rtc); 108 return err; 109 } 110 111 err = device_create_file(&plat_dev->dev, &dev_attr_irq); 112 if (err) 113 goto err; 114 115 platform_set_drvdata(plat_dev, rtc); 116 117 return 0; 118 119 err: 120 return err; 121 } 122 123 static int test_remove(struct platform_device *plat_dev) 124 { 125 device_remove_file(&plat_dev->dev, &dev_attr_irq); 126 127 return 0; 128 } 129 130 static struct platform_driver test_driver = { 131 .probe = test_probe, 132 .remove = test_remove, 133 .driver = { 134 .name = "rtc-test", 135 .owner = THIS_MODULE, 136 }, 137 }; 138 139 static int __init test_init(void) 140 { 141 int err; 142 143 if ((err = platform_driver_register(&test_driver))) 144 return err; 145 146 if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) { 147 err = -ENOMEM; 148 goto exit_driver_unregister; 149 } 150 151 if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) { 152 err = -ENOMEM; 153 goto exit_put_test0; 154 } 155 156 if ((err = platform_device_add(test0))) 157 goto exit_put_test1; 158 159 if ((err = platform_device_add(test1))) 160 goto exit_del_test0; 161 162 return 0; 163 164 exit_del_test0: 165 platform_device_del(test0); 166 167 exit_put_test1: 168 platform_device_put(test1); 169 170 exit_put_test0: 171 platform_device_put(test0); 172 173 exit_driver_unregister: 174 platform_driver_unregister(&test_driver); 175 return err; 176 } 177 178 static void __exit test_exit(void) 179 { 180 platform_device_unregister(test0); 181 platform_device_unregister(test1); 182 platform_driver_unregister(&test_driver); 183 } 184 185 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 186 MODULE_DESCRIPTION("RTC test driver/device"); 187 MODULE_LICENSE("GPL"); 188 189 module_init(test_init); 190 module_exit(test_exit); 191