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Linux/drivers/rtc/rtc-da9055.c

  1 /*
  2  * Real time clock driver for DA9055
  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 
 19 #include <linux/mfd/da9055/core.h>
 20 #include <linux/mfd/da9055/reg.h>
 21 #include <linux/mfd/da9055/pdata.h>
 22 
 23 struct da9055_rtc {
 24         struct rtc_device *rtc;
 25         struct da9055 *da9055;
 26         int alarm_enable;
 27 };
 28 
 29 static int da9055_rtc_enable_alarm(struct da9055_rtc *rtc, bool enable)
 30 {
 31         int ret;
 32         if (enable) {
 33                 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
 34                                         DA9055_RTC_ALM_EN,
 35                                         DA9055_RTC_ALM_EN);
 36                 if (ret != 0)
 37                         dev_err(rtc->da9055->dev, "Failed to enable ALM: %d\n",
 38                                 ret);
 39                 rtc->alarm_enable = 1;
 40         } else {
 41                 ret = da9055_reg_update(rtc->da9055, DA9055_REG_ALARM_Y,
 42                                         DA9055_RTC_ALM_EN, 0);
 43                 if (ret != 0)
 44                         dev_err(rtc->da9055->dev,
 45                                 "Failed to disable ALM: %d\n", ret);
 46                 rtc->alarm_enable = 0;
 47         }
 48         return ret;
 49 }
 50 
 51 static irqreturn_t da9055_rtc_alm_irq(int irq, void *data)
 52 {
 53         struct da9055_rtc *rtc = data;
 54 
 55         da9055_rtc_enable_alarm(rtc, 0);
 56         rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
 57 
 58         return IRQ_HANDLED;
 59 }
 60 
 61 static int da9055_read_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
 62 {
 63         int ret;
 64         uint8_t v[5];
 65 
 66         ret = da9055_group_read(da9055, DA9055_REG_ALARM_MI, 5, v);
 67         if (ret != 0) {
 68                 dev_err(da9055->dev, "Failed to group read ALM: %d\n", ret);
 69                 return ret;
 70         }
 71 
 72         rtc_tm->tm_year = (v[4] & DA9055_RTC_ALM_YEAR) + 100;
 73         rtc_tm->tm_mon  = (v[3] & DA9055_RTC_ALM_MONTH) - 1;
 74         rtc_tm->tm_mday = v[2] & DA9055_RTC_ALM_DAY;
 75         rtc_tm->tm_hour = v[1] & DA9055_RTC_ALM_HOUR;
 76         rtc_tm->tm_min  = v[0] & DA9055_RTC_ALM_MIN;
 77 
 78         return rtc_valid_tm(rtc_tm);
 79 }
 80 
 81 static int da9055_set_alarm(struct da9055 *da9055, struct rtc_time *rtc_tm)
 82 {
 83         int ret;
 84         uint8_t v[2];
 85 
 86         rtc_tm->tm_year -= 100;
 87         rtc_tm->tm_mon += 1;
 88 
 89         ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MI,
 90                                 DA9055_RTC_ALM_MIN, rtc_tm->tm_min);
 91         if (ret != 0) {
 92                 dev_err(da9055->dev, "Failed to write ALRM MIN: %d\n", ret);
 93                 return ret;
 94         }
 95 
 96         v[0] = rtc_tm->tm_hour;
 97         v[1] = rtc_tm->tm_mday;
 98 
 99         ret = da9055_group_write(da9055, DA9055_REG_ALARM_H, 2, v);
100         if (ret < 0)
101                 return ret;
102 
103         ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
104                                 DA9055_RTC_ALM_MONTH, rtc_tm->tm_mon);
105         if (ret < 0)
106                 dev_err(da9055->dev, "Failed to write ALM Month:%d\n", ret);
107 
108         ret = da9055_reg_update(da9055, DA9055_REG_ALARM_Y,
109                                 DA9055_RTC_ALM_YEAR, rtc_tm->tm_year);
110         if (ret < 0)
111                 dev_err(da9055->dev, "Failed to write ALM Year:%d\n", ret);
112 
113         return ret;
114 }
115 
116 static int da9055_rtc_get_alarm_status(struct da9055 *da9055)
117 {
118         int ret;
119 
120         ret = da9055_reg_read(da9055, DA9055_REG_ALARM_Y);
121         if (ret < 0) {
122                 dev_err(da9055->dev, "Failed to read ALM: %d\n", ret);
123                 return ret;
124         }
125         ret &= DA9055_RTC_ALM_EN;
126         return (ret > 0) ? 1 : 0;
127 }
128 
129 static int da9055_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
130 {
131         struct da9055_rtc *rtc = dev_get_drvdata(dev);
132         uint8_t v[6];
133         int ret;
134 
135         ret = da9055_reg_read(rtc->da9055, DA9055_REG_COUNT_S);
136         if (ret < 0)
137                 return ret;
138 
139         /*
140          * Registers are only valid when RTC_READ
141          * status bit is asserted
142          */
143         if (!(ret & DA9055_RTC_READ))
144                 return -EBUSY;
145 
146         ret = da9055_group_read(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
147         if (ret < 0) {
148                 dev_err(rtc->da9055->dev, "Failed to read RTC time : %d\n",
149                         ret);
150                 return ret;
151         }
152 
153         rtc_tm->tm_year = (v[5] & DA9055_RTC_YEAR) + 100;
154         rtc_tm->tm_mon  = (v[4] & DA9055_RTC_MONTH) - 1;
155         rtc_tm->tm_mday = v[3] & DA9055_RTC_DAY;
156         rtc_tm->tm_hour = v[2] & DA9055_RTC_HOUR;
157         rtc_tm->tm_min  = v[1] & DA9055_RTC_MIN;
158         rtc_tm->tm_sec  = v[0] & DA9055_RTC_SEC;
159 
160         return rtc_valid_tm(rtc_tm);
161 }
162 
163 static int da9055_rtc_set_time(struct device *dev, struct rtc_time *tm)
164 {
165         struct da9055_rtc *rtc;
166         uint8_t v[6];
167 
168         rtc = dev_get_drvdata(dev);
169 
170         v[0] = tm->tm_sec;
171         v[1] = tm->tm_min;
172         v[2] = tm->tm_hour;
173         v[3] = tm->tm_mday;
174         v[4] = tm->tm_mon + 1;
175         v[5] = tm->tm_year - 100;
176 
177         return da9055_group_write(rtc->da9055, DA9055_REG_COUNT_S, 6, v);
178 }
179 
180 static int da9055_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
181 {
182         int ret;
183         struct rtc_time *tm = &alrm->time;
184         struct da9055_rtc *rtc = dev_get_drvdata(dev);
185 
186         ret = da9055_read_alarm(rtc->da9055, tm);
187 
188         if (ret)
189                 return ret;
190 
191         alrm->enabled = da9055_rtc_get_alarm_status(rtc->da9055);
192 
193         return 0;
194 }
195 
196 static int da9055_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
197 {
198         int ret;
199         struct rtc_time *tm = &alrm->time;
200         struct da9055_rtc *rtc = dev_get_drvdata(dev);
201 
202         ret = da9055_rtc_enable_alarm(rtc, 0);
203         if (ret < 0)
204                 return ret;
205 
206         ret = da9055_set_alarm(rtc->da9055, tm);
207         if (ret)
208                 return ret;
209 
210         ret = da9055_rtc_enable_alarm(rtc, 1);
211 
212         return ret;
213 }
214 
215 static int da9055_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
216 {
217         struct da9055_rtc *rtc = dev_get_drvdata(dev);
218 
219         return da9055_rtc_enable_alarm(rtc, enabled);
220 }
221 
222 static const struct rtc_class_ops da9055_rtc_ops = {
223         .read_time      = da9055_rtc_read_time,
224         .set_time       = da9055_rtc_set_time,
225         .read_alarm     = da9055_rtc_read_alarm,
226         .set_alarm      = da9055_rtc_set_alarm,
227         .alarm_irq_enable = da9055_rtc_alarm_irq_enable,
228 };
229 
230 static int da9055_rtc_device_init(struct da9055 *da9055,
231                                         struct da9055_pdata *pdata)
232 {
233         int ret;
234 
235         /* Enable RTC and the internal Crystal */
236         ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
237                                 DA9055_RTC_EN, DA9055_RTC_EN);
238         if (ret < 0)
239                 return ret;
240         ret = da9055_reg_update(da9055, DA9055_REG_EN_32K,
241                                 DA9055_CRYSTAL_EN, DA9055_CRYSTAL_EN);
242         if (ret < 0)
243                 return ret;
244 
245         /* Enable RTC in Power Down mode */
246         ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
247                                 DA9055_RTC_MODE_PD, DA9055_RTC_MODE_PD);
248         if (ret < 0)
249                 return ret;
250 
251         /* Enable RTC in Reset mode */
252         if (pdata && pdata->reset_enable) {
253                 ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
254                                         DA9055_RTC_MODE_SD,
255                                         DA9055_RTC_MODE_SD <<
256                                         DA9055_RTC_MODE_SD_SHIFT);
257                 if (ret < 0)
258                         return ret;
259         }
260 
261         /* Disable the RTC TICK ALM */
262         ret = da9055_reg_update(da9055, DA9055_REG_ALARM_MO,
263                                 DA9055_RTC_TICK_WAKE_MASK, 0);
264         if (ret < 0)
265                 return ret;
266 
267         return 0;
268 }
269 
270 static int da9055_rtc_probe(struct platform_device *pdev)
271 {
272         struct da9055_rtc *rtc;
273         struct da9055_pdata *pdata = NULL;
274         int ret, alm_irq;
275 
276         rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9055_rtc), GFP_KERNEL);
277         if (!rtc)
278                 return -ENOMEM;
279 
280         rtc->da9055 = dev_get_drvdata(pdev->dev.parent);
281         pdata = dev_get_platdata(rtc->da9055->dev);
282         platform_set_drvdata(pdev, rtc);
283 
284         ret = da9055_rtc_device_init(rtc->da9055, pdata);
285         if (ret < 0)
286                 goto err_rtc;
287 
288         ret = da9055_reg_read(rtc->da9055, DA9055_REG_ALARM_Y);
289         if (ret < 0)
290                 goto err_rtc;
291 
292         if (ret & DA9055_RTC_ALM_EN)
293                 rtc->alarm_enable = 1;
294 
295         device_init_wakeup(&pdev->dev, 1);
296 
297         rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
298                                         &da9055_rtc_ops, THIS_MODULE);
299         if (IS_ERR(rtc->rtc)) {
300                 ret = PTR_ERR(rtc->rtc);
301                 goto err_rtc;
302         }
303 
304         alm_irq = platform_get_irq_byname(pdev, "ALM");
305         if (alm_irq < 0)
306                 return alm_irq;
307 
308         ret = devm_request_threaded_irq(&pdev->dev, alm_irq, NULL,
309                                         da9055_rtc_alm_irq,
310                                         IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
311                                         "ALM", rtc);
312         if (ret != 0)
313                 dev_err(rtc->da9055->dev, "irq registration failed: %d\n", ret);
314 
315 err_rtc:
316         return ret;
317 
318 }
319 
320 #ifdef CONFIG_PM
321 /* Turn off the alarm if it should not be a wake source. */
322 static int da9055_rtc_suspend(struct device *dev)
323 {
324         struct platform_device *pdev = to_platform_device(dev);
325         struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
326         int ret;
327 
328         if (!device_may_wakeup(&pdev->dev)) {
329                 /* Disable the ALM IRQ */
330                 ret = da9055_rtc_enable_alarm(rtc, 0);
331                 if (ret < 0)
332                         dev_err(&pdev->dev, "Failed to disable RTC ALM\n");
333         }
334 
335         return 0;
336 }
337 
338 /* Enable the alarm if it should be enabled (in case it was disabled to
339  * prevent use as a wake source).
340  */
341 static int da9055_rtc_resume(struct device *dev)
342 {
343         struct platform_device *pdev = to_platform_device(dev);
344         struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
345         int ret;
346 
347         if (!device_may_wakeup(&pdev->dev)) {
348                 if (rtc->alarm_enable) {
349                         ret = da9055_rtc_enable_alarm(rtc, 1);
350                         if (ret < 0)
351                                 dev_err(&pdev->dev,
352                                         "Failed to restart RTC ALM\n");
353                 }
354         }
355 
356         return 0;
357 }
358 
359 /* Unconditionally disable the alarm */
360 static int da9055_rtc_freeze(struct device *dev)
361 {
362         struct platform_device *pdev = to_platform_device(dev);
363         struct da9055_rtc *rtc = dev_get_drvdata(&pdev->dev);
364         int ret;
365 
366         ret = da9055_rtc_enable_alarm(rtc, 0);
367         if (ret < 0)
368                 dev_err(&pdev->dev, "Failed to freeze RTC ALMs\n");
369 
370         return 0;
371 
372 }
373 #else
374 #define da9055_rtc_suspend NULL
375 #define da9055_rtc_resume NULL
376 #define da9055_rtc_freeze NULL
377 #endif
378 
379 static const struct dev_pm_ops da9055_rtc_pm_ops = {
380         .suspend = da9055_rtc_suspend,
381         .resume = da9055_rtc_resume,
382 
383         .freeze = da9055_rtc_freeze,
384         .thaw = da9055_rtc_resume,
385         .restore = da9055_rtc_resume,
386 
387         .poweroff = da9055_rtc_suspend,
388 };
389 
390 static struct platform_driver da9055_rtc_driver = {
391         .probe  = da9055_rtc_probe,
392         .driver = {
393                 .name   = "da9055-rtc",
394                 .owner  = THIS_MODULE,
395                 .pm = &da9055_rtc_pm_ops,
396         },
397 };
398 
399 module_platform_driver(da9055_rtc_driver);
400 
401 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
402 MODULE_DESCRIPTION("RTC driver for Dialog DA9055 PMIC");
403 MODULE_LICENSE("GPL");
404 MODULE_ALIAS("platform:da9055-rtc");
405 

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