| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * An RTC test device/driver |
| 4 | * Copyright (C) 2005 Tower Technologies |
| 5 | * Author: Alessandro Zummo <a.zummo@towertech.it> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/err.h> |
| 10 | #include <linux/rtc.h> |
| 11 | #include <linux/platform_device.h> |
| 12 | |
| 13 | #define MAX_RTC_TEST 3 |
| 14 | |
| 15 | struct rtc_test_data { |
| 16 | struct rtc_device *rtc; |
| 17 | time64_t offset; |
| 18 | struct timer_list alarm; |
| 19 | bool alarm_en; |
| 20 | }; |
| 21 | |
| 22 | static struct platform_device *pdev[MAX_RTC_TEST]; |
| 23 | |
| 24 | static int test_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 25 | { |
| 26 | struct rtc_test_data *rtd = dev_get_drvdata(dev); |
| 27 | time64_t alarm; |
| 28 | |
| 29 | alarm = (rtd->alarm.expires - jiffies) / HZ; |
| 30 | alarm += ktime_get_real_seconds() + rtd->offset; |
| 31 | |
| 32 | rtc_time64_to_tm(alarm, &alrm->time); |
| 33 | alrm->enabled = rtd->alarm_en; |
| 34 | |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static int test_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 39 | { |
| 40 | struct rtc_test_data *rtd = dev_get_drvdata(dev); |
| 41 | ktime_t timeout; |
| 42 | u64 expires; |
| 43 | |
| 44 | timeout = rtc_tm_to_time64(&alrm->time) - ktime_get_real_seconds(); |
| 45 | timeout -= rtd->offset; |
| 46 | |
| 47 | del_timer(&rtd->alarm); |
| 48 | |
| 49 | expires = jiffies + timeout * HZ; |
| 50 | if (expires > U32_MAX) |
| 51 | expires = U32_MAX; |
| 52 | |
| 53 | rtd->alarm.expires = expires; |
| 54 | |
| 55 | if (alrm->enabled) |
| 56 | add_timer(&rtd->alarm); |
| 57 | |
| 58 | rtd->alarm_en = alrm->enabled; |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int test_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 64 | { |
| 65 | struct rtc_test_data *rtd = dev_get_drvdata(dev); |
| 66 | |
| 67 | rtc_time64_to_tm(ktime_get_real_seconds() + rtd->offset, tm); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static int test_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 73 | { |
| 74 | struct rtc_test_data *rtd = dev_get_drvdata(dev); |
| 75 | |
| 76 | rtd->offset = rtc_tm_to_time64(tm) - ktime_get_real_seconds(); |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int test_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) |
| 82 | { |
| 83 | struct rtc_test_data *rtd = dev_get_drvdata(dev); |
| 84 | |
| 85 | rtd->alarm_en = enable; |
| 86 | if (enable) |
| 87 | add_timer(&rtd->alarm); |
| 88 | else |
| 89 | del_timer(&rtd->alarm); |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static const struct rtc_class_ops test_rtc_ops_noalm = { |
| 95 | .read_time = test_rtc_read_time, |
| 96 | .set_time = test_rtc_set_time, |
| 97 | .alarm_irq_enable = test_rtc_alarm_irq_enable, |
| 98 | }; |
| 99 | |
| 100 | static const struct rtc_class_ops test_rtc_ops = { |
| 101 | .read_time = test_rtc_read_time, |
| 102 | .set_time = test_rtc_set_time, |
| 103 | .read_alarm = test_rtc_read_alarm, |
| 104 | .set_alarm = test_rtc_set_alarm, |
| 105 | .alarm_irq_enable = test_rtc_alarm_irq_enable, |
| 106 | }; |
| 107 | |
| 108 | static void test_rtc_alarm_handler(struct timer_list *t) |
| 109 | { |
| 110 | struct rtc_test_data *rtd = from_timer(rtd, t, alarm); |
| 111 | |
| 112 | rtc_update_irq(rtd->rtc, 1, RTC_AF | RTC_IRQF); |
| 113 | } |
| 114 | |
| 115 | static int test_probe(struct platform_device *plat_dev) |
| 116 | { |
| 117 | struct rtc_test_data *rtd; |
| 118 | |
| 119 | rtd = devm_kzalloc(&plat_dev->dev, sizeof(*rtd), GFP_KERNEL); |
| 120 | if (!rtd) |
| 121 | return -ENOMEM; |
| 122 | |
| 123 | platform_set_drvdata(plat_dev, rtd); |
| 124 | |
| 125 | rtd->rtc = devm_rtc_allocate_device(&plat_dev->dev); |
| 126 | if (IS_ERR(rtd->rtc)) |
| 127 | return PTR_ERR(rtd->rtc); |
| 128 | |
| 129 | switch (plat_dev->id) { |
| 130 | case 0: |
| 131 | rtd->rtc->ops = &test_rtc_ops_noalm; |
| 132 | break; |
| 133 | default: |
| 134 | rtd->rtc->ops = &test_rtc_ops; |
| 135 | device_init_wakeup(&plat_dev->dev, 1); |
| 136 | } |
| 137 | |
| 138 | timer_setup(&rtd->alarm, test_rtc_alarm_handler, 0); |
| 139 | rtd->alarm.expires = 0; |
| 140 | |
| 141 | return devm_rtc_register_device(rtd->rtc); |
| 142 | } |
| 143 | |
| 144 | static struct platform_driver test_driver = { |
| 145 | .probe = test_probe, |
| 146 | .driver = { |
| 147 | .name = "rtc-test", |
| 148 | }, |
| 149 | }; |
| 150 | |
| 151 | static int __init test_init(void) |
| 152 | { |
| 153 | int i, err; |
| 154 | |
| 155 | err = platform_driver_register(&test_driver); |
| 156 | if (err) |
| 157 | return err; |
| 158 | |
| 159 | err = -ENOMEM; |
| 160 | for (i = 0; i < MAX_RTC_TEST; i++) { |
| 161 | pdev[i] = platform_device_alloc("rtc-test", i); |
| 162 | if (!pdev[i]) |
| 163 | goto exit_free_mem; |
| 164 | } |
| 165 | |
| 166 | for (i = 0; i < MAX_RTC_TEST; i++) { |
| 167 | err = platform_device_add(pdev[i]); |
| 168 | if (err) |
| 169 | goto exit_device_del; |
| 170 | } |
| 171 | |
| 172 | return 0; |
| 173 | |
| 174 | exit_device_del: |
| 175 | for (; i > 0; i--) |
| 176 | platform_device_del(pdev[i - 1]); |
| 177 | |
| 178 | exit_free_mem: |
| 179 | for (i = 0; i < MAX_RTC_TEST; i++) |
| 180 | platform_device_put(pdev[i]); |
| 181 | |
| 182 | platform_driver_unregister(&test_driver); |
| 183 | return err; |
| 184 | } |
| 185 | |
| 186 | static void __exit test_exit(void) |
| 187 | { |
| 188 | int i; |
| 189 | |
| 190 | for (i = 0; i < MAX_RTC_TEST; i++) |
| 191 | platform_device_unregister(pdev[i]); |
| 192 | |
| 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 v2"); |
| 199 | |
| 200 | module_init(test_init); |
| 201 | module_exit(test_exit); |