1 /* rtc-da9063.c - Real time clock device driver for DA9063
2 * Copyright (C) 2013-14 Dialog Semiconductor Ltd.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/interrupt.h>
20 #include <linux/rtc.h>
21 #include <linux/slab.h>
22 #include <linux/delay.h>
23 #include <linux/regmap.h>
24 #include <linux/mfd/da9063/registers.h>
25 #include <linux/mfd/da9063/core.h>
27 #define YEARS_TO_DA9063(year) ((year) - 100)
28 #define MONTHS_TO_DA9063(month) ((month) + 1)
29 #define YEARS_FROM_DA9063(year) ((year) + 100)
30 #define MONTHS_FROM_DA9063(month) ((month) - 1)
32 #define RTC_DATA_LEN (DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1)
41 struct rtc_device *rtc_dev;
43 struct rtc_time alarm_time;
47 static void da9063_data_to_tm(u8 *data, struct rtc_time *tm)
49 tm->tm_sec = data[RTC_SEC] & DA9063_COUNT_SEC_MASK;
50 tm->tm_min = data[RTC_MIN] & DA9063_COUNT_MIN_MASK;
51 tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK;
52 tm->tm_mday = data[RTC_DAY] & DA9063_COUNT_DAY_MASK;
53 tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
54 DA9063_COUNT_MONTH_MASK);
55 tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
56 DA9063_COUNT_YEAR_MASK);
59 static void da9063_tm_to_data(struct rtc_time *tm, u8 *data)
61 data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK;
62 data[RTC_SEC] |= tm->tm_sec & DA9063_COUNT_SEC_MASK;
64 data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK;
65 data[RTC_MIN] |= tm->tm_min & DA9063_COUNT_MIN_MASK;
67 data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK;
68 data[RTC_HOUR] |= tm->tm_hour & DA9063_COUNT_HOUR_MASK;
70 data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK;
71 data[RTC_DAY] |= tm->tm_mday & DA9063_COUNT_DAY_MASK;
73 data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK;
74 data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
75 DA9063_COUNT_MONTH_MASK;
77 data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK;
78 data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
79 DA9063_COUNT_YEAR_MASK;
82 static int da9063_rtc_stop_alarm(struct device *dev)
84 struct da9063_rtc *rtc = dev_get_drvdata(dev);
86 return regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
90 static int da9063_rtc_start_alarm(struct device *dev)
92 struct da9063_rtc *rtc = dev_get_drvdata(dev);
94 return regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
95 DA9063_ALARM_ON, DA9063_ALARM_ON);
98 static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
100 struct da9063_rtc *rtc = dev_get_drvdata(dev);
101 unsigned long tm_secs;
102 unsigned long al_secs;
103 u8 data[RTC_DATA_LEN];
106 ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S,
109 dev_err(dev, "Failed to read RTC time data: %d\n", ret);
113 if (!(data[RTC_SEC] & DA9063_RTC_READ)) {
114 dev_dbg(dev, "RTC not yet ready to be read by the host\n");
118 da9063_data_to_tm(data, tm);
120 rtc_tm_to_time(tm, &tm_secs);
121 rtc_tm_to_time(&rtc->alarm_time, &al_secs);
123 /* handle the rtc synchronisation delay */
124 if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
125 memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
127 rtc->rtc_sync = false;
129 return rtc_valid_tm(tm);
132 static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
134 struct da9063_rtc *rtc = dev_get_drvdata(dev);
135 u8 data[RTC_DATA_LEN];
138 da9063_tm_to_data(tm, data);
139 ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S,
142 dev_err(dev, "Failed to set RTC time data: %d\n", ret);
147 static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
149 struct da9063_rtc *rtc = dev_get_drvdata(dev);
150 u8 data[RTC_DATA_LEN];
154 ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_ALARM_S,
155 &data[RTC_SEC], RTC_DATA_LEN);
159 da9063_data_to_tm(data, &alrm->time);
161 alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON);
163 ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val);
167 if (val & (DA9063_E_ALARM))
175 static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
177 struct da9063_rtc *rtc = dev_get_drvdata(dev);
178 u8 data[RTC_DATA_LEN];
181 da9063_tm_to_data(&alrm->time, data);
183 ret = da9063_rtc_stop_alarm(dev);
185 dev_err(dev, "Failed to stop alarm: %d\n", ret);
189 ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_ALARM_S,
192 dev_err(dev, "Failed to write alarm: %d\n", ret);
196 rtc->alarm_time = alrm->time;
199 ret = da9063_rtc_start_alarm(dev);
201 dev_err(dev, "Failed to start alarm: %d\n", ret);
209 static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
212 return da9063_rtc_start_alarm(dev);
214 return da9063_rtc_stop_alarm(dev);
217 static irqreturn_t da9063_alarm_event(int irq, void *data)
219 struct da9063_rtc *rtc = data;
221 regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
224 rtc->rtc_sync = true;
225 rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
230 static const struct rtc_class_ops da9063_rtc_ops = {
231 .read_time = da9063_rtc_read_time,
232 .set_time = da9063_rtc_set_time,
233 .read_alarm = da9063_rtc_read_alarm,
234 .set_alarm = da9063_rtc_set_alarm,
235 .alarm_irq_enable = da9063_rtc_alarm_irq_enable,
238 static int da9063_rtc_probe(struct platform_device *pdev)
240 struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
241 struct da9063_rtc *rtc;
243 u8 data[RTC_DATA_LEN];
246 ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E,
247 DA9063_RTC_EN, DA9063_RTC_EN);
249 dev_err(&pdev->dev, "Failed to enable RTC\n");
253 ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K,
254 DA9063_CRYSTAL, DA9063_CRYSTAL);
256 dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
260 ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_S,
261 DA9063_ALARM_STATUS_TICK | DA9063_ALARM_STATUS_ALARM,
264 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
268 ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_S,
269 DA9063_ALARM_STATUS_ALARM,
270 DA9063_ALARM_STATUS_ALARM);
272 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
276 ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_Y,
279 dev_err(&pdev->dev, "Failed to disable TICKs\n");
283 ret = regmap_bulk_read(da9063->regmap, DA9063_REG_ALARM_S,
286 dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
291 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
295 platform_set_drvdata(pdev, rtc);
297 irq_alarm = platform_get_irq_byname(pdev, "ALARM");
298 ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
300 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
303 dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
309 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
310 &da9063_rtc_ops, THIS_MODULE);
311 if (IS_ERR(rtc->rtc_dev))
312 return PTR_ERR(rtc->rtc_dev);
314 da9063_data_to_tm(data, &rtc->alarm_time);
315 rtc->rtc_sync = false;
320 static struct platform_driver da9063_rtc_driver = {
321 .probe = da9063_rtc_probe,
323 .name = DA9063_DRVNAME_RTC,
324 .owner = THIS_MODULE,
328 module_platform_driver(da9063_rtc_driver);
330 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
331 MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
332 MODULE_LICENSE("GPL v2");
333 MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);