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_time(struct device *dev, 38 struct rtc_time *tm) 39 { 40 return 0; 41 } 42 43 static int test_rtc_set_mmss(struct device *dev, unsigned long secs) 44 { 45 return 0; 46 } 47 48 static int test_rtc_proc(struct device *dev, struct seq_file *seq) 49 { 50 struct platform_device *plat_dev = to_platform_device(dev); 51 52 seq_printf(seq, "24hr\t\t: yes\n"); 53 seq_printf(seq, "test\t\t: yes\n"); 54 seq_printf(seq, "id\t\t: %d\n", plat_dev->id); 55 56 return 0; 57 } 58 59 static int test_rtc_ioctl(struct device *dev, unsigned int cmd, 60 unsigned long arg) 61 { 62 /* We do support interrupts, they're generated 63 * using the sysfs interface. 64 */ 65 switch (cmd) { 66 case RTC_PIE_ON: 67 case RTC_PIE_OFF: 68 case RTC_UIE_ON: 69 case RTC_UIE_OFF: 70 case RTC_AIE_ON: 71 case RTC_AIE_OFF: 72 return 0; 73 74 default: 75 return -EINVAL; 76 } 77 } 78 79 static struct rtc_class_ops test_rtc_ops = { 80 .proc = test_rtc_proc, 81 .read_time = test_rtc_read_time, 82 .set_time = test_rtc_set_time, 83 .read_alarm = test_rtc_read_alarm, 84 .set_alarm = test_rtc_set_alarm, 85 .set_mmss = test_rtc_set_mmss, 86 .ioctl = test_rtc_ioctl, 87 }; 88 89 static ssize_t test_irq_show(struct device *dev, 90 struct device_attribute *attr, char *buf) 91 { 92 return sprintf(buf, "%d\n", 42); 93 } 94 static ssize_t test_irq_store(struct device *dev, 95 struct device_attribute *attr, 96 const char *buf, size_t count) 97 { 98 int retval; 99 struct platform_device *plat_dev = to_platform_device(dev); 100 struct rtc_device *rtc = platform_get_drvdata(plat_dev); 101 102 retval = count; 103 if (strncmp(buf, "tick", 4) == 0) 104 rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF); 105 else if (strncmp(buf, "alarm", 5) == 0) 106 rtc_update_irq(&rtc->class_dev, 1, RTC_AF | RTC_IRQF); 107 else if (strncmp(buf, "update", 6) == 0) 108 rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF); 109 else 110 retval = -EINVAL; 111 112 return retval; 113 } 114 static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store); 115 116 static int test_probe(struct platform_device *plat_dev) 117 { 118 int err; 119 struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev, 120 &test_rtc_ops, THIS_MODULE); 121 if (IS_ERR(rtc)) { 122 err = PTR_ERR(rtc); 123 dev_err(&plat_dev->dev, 124 "unable to register the class device\n"); 125 return err; 126 } 127 device_create_file(&plat_dev->dev, &dev_attr_irq); 128 129 platform_set_drvdata(plat_dev, rtc); 130 131 return 0; 132 } 133 134 static int __devexit test_remove(struct platform_device *plat_dev) 135 { 136 struct rtc_device *rtc = platform_get_drvdata(plat_dev); 137 138 rtc_device_unregister(rtc); 139 device_remove_file(&plat_dev->dev, &dev_attr_irq); 140 141 return 0; 142 } 143 144 static struct platform_driver test_drv = { 145 .probe = test_probe, 146 .remove = __devexit_p(test_remove), 147 .driver = { 148 .name = "rtc-test", 149 .owner = THIS_MODULE, 150 }, 151 }; 152 153 static int __init test_init(void) 154 { 155 int err; 156 157 if ((err = platform_driver_register(&test_drv))) 158 return err; 159 160 if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) { 161 err = -ENOMEM; 162 goto exit_driver_unregister; 163 } 164 165 if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) { 166 err = -ENOMEM; 167 goto exit_free_test0; 168 } 169 170 if ((err = platform_device_add(test0))) 171 goto exit_free_test1; 172 173 if ((err = platform_device_add(test1))) 174 goto exit_device_unregister; 175 176 return 0; 177 178 exit_device_unregister: 179 platform_device_unregister(test0); 180 181 exit_free_test1: 182 platform_device_put(test1); 183 184 exit_free_test0: 185 platform_device_put(test0); 186 187 exit_driver_unregister: 188 platform_driver_unregister(&test_drv); 189 return err; 190 } 191 192 static void __exit test_exit(void) 193 { 194 platform_device_unregister(test0); 195 platform_device_unregister(test1); 196 platform_driver_unregister(&test_drv); 197 } 198 199 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 200 MODULE_DESCRIPTION("RTC test driver/device"); 201 MODULE_LICENSE("GPL"); 202 203 module_init(test_init); 204 module_exit(test_exit); 205