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Linux/drivers/rtc/rtc-da9052.c

  1 /*
  2  * Real time clock driver for DA9052
  3  *
  4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
  5  *
  6  * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/rtc.h>
 18 #include <linux/err.h>
 19 
 20 #include <linux/mfd/da9052/da9052.h>
 21 #include <linux/mfd/da9052/reg.h>
 22 
 23 #define rtc_err(rtc, fmt, ...) \
 24                 dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)
 25 
 26 struct da9052_rtc {
 27         struct rtc_device *rtc;
 28         struct da9052 *da9052;
 29 };
 30 
 31 static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)
 32 {
 33         int ret;
 34         if (enable) {
 35                 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
 36                                 DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,
 37                                 DA9052_ALARM_Y_ALARM_ON);
 38                 if (ret != 0)
 39                         rtc_err(rtc, "Failed to enable ALM: %d\n", ret);
 40         } else {
 41                 ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
 42                         DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);
 43                 if (ret != 0)
 44                         rtc_err(rtc, "Write error: %d\n", ret);
 45         }
 46         return ret;
 47 }
 48 
 49 static irqreturn_t da9052_rtc_irq(int irq, void *data)
 50 {
 51         struct da9052_rtc *rtc = data;
 52 
 53         rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
 54 
 55         return IRQ_HANDLED;
 56 }
 57 
 58 static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
 59 {
 60         int ret;
 61         uint8_t v[5];
 62 
 63         ret = da9052_group_read(rtc->da9052, DA9052_ALARM_MI_REG, 5, v);
 64         if (ret != 0) {
 65                 rtc_err(rtc, "Failed to group read ALM: %d\n", ret);
 66                 return ret;
 67         }
 68 
 69         rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100;
 70         rtc_tm->tm_mon  = (v[3] & DA9052_RTC_MONTH) - 1;
 71         rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY;
 72         rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR;
 73         rtc_tm->tm_min  = v[0] & DA9052_RTC_MIN;
 74 
 75         ret = rtc_valid_tm(rtc_tm);
 76         return ret;
 77 }
 78 
 79 static int da9052_set_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)
 80 {
 81         struct da9052 *da9052 = rtc->da9052;
 82         unsigned long alm_time;
 83         int ret;
 84         uint8_t v[3];
 85 
 86         ret = rtc_tm_to_time(rtc_tm, &alm_time);
 87         if (ret != 0)
 88                 return ret;
 89 
 90         if (rtc_tm->tm_sec > 0) {
 91                 alm_time += 60 - rtc_tm->tm_sec;
 92                 rtc_time_to_tm(alm_time, rtc_tm);
 93         }
 94         BUG_ON(rtc_tm->tm_sec); /* it will cause repeated irqs if not zero */
 95 
 96         rtc_tm->tm_year -= 100;
 97         rtc_tm->tm_mon += 1;
 98 
 99         ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG,
100                                 DA9052_RTC_MIN, rtc_tm->tm_min);
101         if (ret != 0) {
102                 rtc_err(rtc, "Failed to write ALRM MIN: %d\n", ret);
103                 return ret;
104         }
105 
106         v[0] = rtc_tm->tm_hour;
107         v[1] = rtc_tm->tm_mday;
108         v[2] = rtc_tm->tm_mon;
109 
110         ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v);
111         if (ret < 0)
112                 return ret;
113 
114         ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG,
115                                 DA9052_RTC_YEAR, rtc_tm->tm_year);
116         if (ret != 0)
117                 rtc_err(rtc, "Failed to write ALRM YEAR: %d\n", ret);
118 
119         return ret;
120 }
121 
122 static int da9052_rtc_get_alarm_status(struct da9052_rtc *rtc)
123 {
124         int ret;
125 
126         ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_Y_REG);
127         if (ret < 0) {
128                 rtc_err(rtc, "Failed to read ALM: %d\n", ret);
129                 return ret;
130         }
131 
132         return !!(ret&DA9052_ALARM_Y_ALARM_ON);
133 }
134 
135 static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
136 {
137         struct da9052_rtc *rtc = dev_get_drvdata(dev);
138         uint8_t v[6];
139         int ret;
140 
141         ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
142         if (ret < 0) {
143                 rtc_err(rtc, "Failed to read RTC time : %d\n", ret);
144                 return ret;
145         }
146 
147         rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100;
148         rtc_tm->tm_mon  = (v[4] & DA9052_RTC_MONTH) - 1;
149         rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY;
150         rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR;
151         rtc_tm->tm_min  = v[1] & DA9052_RTC_MIN;
152         rtc_tm->tm_sec  = v[0] & DA9052_RTC_SEC;
153 
154         ret = rtc_valid_tm(rtc_tm);
155         return ret;
156 }
157 
158 static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm)
159 {
160         struct da9052_rtc *rtc;
161         uint8_t v[6];
162         int ret;
163 
164         rtc = dev_get_drvdata(dev);
165 
166         v[0] = tm->tm_sec;
167         v[1] = tm->tm_min;
168         v[2] = tm->tm_hour;
169         v[3] = tm->tm_mday;
170         v[4] = tm->tm_mon + 1;
171         v[5] = tm->tm_year - 100;
172 
173         ret = da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v);
174         if (ret < 0)
175                 rtc_err(rtc, "failed to set RTC time: %d\n", ret);
176         return ret;
177 }
178 
179 static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
180 {
181         int ret;
182         struct rtc_time *tm = &alrm->time;
183         struct da9052_rtc *rtc = dev_get_drvdata(dev);
184 
185         ret = da9052_read_alarm(rtc, tm);
186         if (ret < 0) {
187                 rtc_err(rtc, "failed to read RTC alarm: %d\n", ret);
188                 return ret;
189         }
190 
191         alrm->enabled = da9052_rtc_get_alarm_status(rtc);
192         return 0;
193 }
194 
195 static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
196 {
197         int ret;
198         struct rtc_time *tm = &alrm->time;
199         struct da9052_rtc *rtc = dev_get_drvdata(dev);
200 
201         ret = da9052_rtc_enable_alarm(rtc, 0);
202         if (ret < 0)
203                 return ret;
204 
205         ret = da9052_set_alarm(rtc, tm);
206         if (ret < 0)
207                 return ret;
208 
209         ret = da9052_rtc_enable_alarm(rtc, 1);
210         return ret;
211 }
212 
213 static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
214 {
215         struct da9052_rtc *rtc = dev_get_drvdata(dev);
216 
217         return da9052_rtc_enable_alarm(rtc, enabled);
218 }
219 
220 static const struct rtc_class_ops da9052_rtc_ops = {
221         .read_time      = da9052_rtc_read_time,
222         .set_time       = da9052_rtc_set_time,
223         .read_alarm     = da9052_rtc_read_alarm,
224         .set_alarm      = da9052_rtc_set_alarm,
225         .alarm_irq_enable = da9052_rtc_alarm_irq_enable,
226 };
227 
228 static int da9052_rtc_probe(struct platform_device *pdev)
229 {
230         struct da9052_rtc *rtc;
231         int ret;
232 
233         rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL);
234         if (!rtc)
235                 return -ENOMEM;
236 
237         rtc->da9052 = dev_get_drvdata(pdev->dev.parent);
238         platform_set_drvdata(pdev, rtc);
239 
240         ret = da9052_reg_write(rtc->da9052, DA9052_BBAT_CONT_REG, 0xFE);
241         if (ret < 0) {
242                 rtc_err(rtc,
243                         "Failed to setup RTC battery charging: %d\n", ret);
244                 return ret;
245         }
246 
247         ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,
248                                 DA9052_ALARM_Y_TICK_ON, 0);
249         if (ret != 0)
250                 rtc_err(rtc, "Failed to disable TICKS: %d\n", ret);
251 
252         ret = da9052_request_irq(rtc->da9052, DA9052_IRQ_ALARM, "ALM",
253                                 da9052_rtc_irq, rtc);
254         if (ret != 0) {
255                 rtc_err(rtc, "irq registration failed: %d\n", ret);
256                 return ret;
257         }
258 
259         rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
260                                        &da9052_rtc_ops, THIS_MODULE);
261         return PTR_ERR_OR_ZERO(rtc->rtc);
262 }
263 
264 static struct platform_driver da9052_rtc_driver = {
265         .probe  = da9052_rtc_probe,
266         .driver = {
267                 .name   = "da9052-rtc",
268                 .owner  = THIS_MODULE,
269         },
270 };
271 
272 module_platform_driver(da9052_rtc_driver);
273 
274 MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
275 MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC");
276 MODULE_LICENSE("GPL");
277 MODULE_ALIAS("platform:da9052-rtc");
278 

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