Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/rtc/rtc-max77686.c

  1 /*
  2  * RTC driver for Maxim MAX77686 and MAX77802
  3  *
  4  * Copyright (C) 2012 Samsung Electronics Co.Ltd
  5  *
  6  *  based on rtc-max8997.c
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  *
 13  */
 14 
 15 #include <linux/i2c.h>
 16 #include <linux/slab.h>
 17 #include <linux/rtc.h>
 18 #include <linux/delay.h>
 19 #include <linux/mutex.h>
 20 #include <linux/module.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/mfd/max77686-private.h>
 23 #include <linux/irqdomain.h>
 24 #include <linux/regmap.h>
 25 
 26 #define MAX77686_I2C_ADDR_RTC           (0x0C >> 1)
 27 #define MAX77620_I2C_ADDR_RTC           0x68
 28 #define MAX77686_INVALID_I2C_ADDR       (-1)
 29 
 30 /* Define non existing register */
 31 #define MAX77686_INVALID_REG            (-1)
 32 
 33 /* RTC Control Register */
 34 #define BCD_EN_SHIFT                    0
 35 #define BCD_EN_MASK                     BIT(BCD_EN_SHIFT)
 36 #define MODEL24_SHIFT                   1
 37 #define MODEL24_MASK                    BIT(MODEL24_SHIFT)
 38 /* RTC Update Register1 */
 39 #define RTC_UDR_SHIFT                   0
 40 #define RTC_UDR_MASK                    BIT(RTC_UDR_SHIFT)
 41 #define RTC_RBUDR_SHIFT                 4
 42 #define RTC_RBUDR_MASK                  BIT(RTC_RBUDR_SHIFT)
 43 /* RTC Hour register */
 44 #define HOUR_PM_SHIFT                   6
 45 #define HOUR_PM_MASK                    BIT(HOUR_PM_SHIFT)
 46 /* RTC Alarm Enable */
 47 #define ALARM_ENABLE_SHIFT              7
 48 #define ALARM_ENABLE_MASK               BIT(ALARM_ENABLE_SHIFT)
 49 
 50 #define REG_RTC_NONE                    0xdeadbeef
 51 
 52 /*
 53  * MAX77802 has separate register (RTCAE1) for alarm enable instead
 54  * using 1 bit from registers RTC{SEC,MIN,HOUR,DAY,MONTH,YEAR,DATE}
 55  * as in done in MAX77686.
 56  */
 57 #define MAX77802_ALARM_ENABLE_VALUE     0x77
 58 
 59 enum {
 60         RTC_SEC = 0,
 61         RTC_MIN,
 62         RTC_HOUR,
 63         RTC_WEEKDAY,
 64         RTC_MONTH,
 65         RTC_YEAR,
 66         RTC_DATE,
 67         RTC_NR_TIME
 68 };
 69 
 70 struct max77686_rtc_driver_data {
 71         /* Minimum usecs needed for a RTC update */
 72         unsigned long           delay;
 73         /* Mask used to read RTC registers value */
 74         u8                      mask;
 75         /* Registers offset to I2C addresses map */
 76         const unsigned int      *map;
 77         /* Has a separate alarm enable register? */
 78         bool                    alarm_enable_reg;
 79         /* I2C address for RTC block */
 80         int                     rtc_i2c_addr;
 81         /* RTC interrupt via platform resource */
 82         bool                    rtc_irq_from_platform;
 83         /* Pending alarm status register */
 84         int                     alarm_pending_status_reg;
 85         /* RTC IRQ CHIP for regmap */
 86         const struct regmap_irq_chip *rtc_irq_chip;
 87 };
 88 
 89 struct max77686_rtc_info {
 90         struct device           *dev;
 91         struct i2c_client       *rtc;
 92         struct rtc_device       *rtc_dev;
 93         struct mutex            lock;
 94 
 95         struct regmap           *regmap;
 96         struct regmap           *rtc_regmap;
 97 
 98         const struct max77686_rtc_driver_data *drv_data;
 99         struct regmap_irq_chip_data *rtc_irq_data;
100 
101         int rtc_irq;
102         int virq;
103         int rtc_24hr_mode;
104 };
105 
106 enum MAX77686_RTC_OP {
107         MAX77686_RTC_WRITE,
108         MAX77686_RTC_READ,
109 };
110 
111 /* These are not registers but just offsets that are mapped to addresses */
112 enum max77686_rtc_reg_offset {
113         REG_RTC_CONTROLM = 0,
114         REG_RTC_CONTROL,
115         REG_RTC_UPDATE0,
116         REG_WTSR_SMPL_CNTL,
117         REG_RTC_SEC,
118         REG_RTC_MIN,
119         REG_RTC_HOUR,
120         REG_RTC_WEEKDAY,
121         REG_RTC_MONTH,
122         REG_RTC_YEAR,
123         REG_RTC_DATE,
124         REG_ALARM1_SEC,
125         REG_ALARM1_MIN,
126         REG_ALARM1_HOUR,
127         REG_ALARM1_WEEKDAY,
128         REG_ALARM1_MONTH,
129         REG_ALARM1_YEAR,
130         REG_ALARM1_DATE,
131         REG_ALARM2_SEC,
132         REG_ALARM2_MIN,
133         REG_ALARM2_HOUR,
134         REG_ALARM2_WEEKDAY,
135         REG_ALARM2_MONTH,
136         REG_ALARM2_YEAR,
137         REG_ALARM2_DATE,
138         REG_RTC_AE1,
139         REG_RTC_END,
140 };
141 
142 /* Maps RTC registers offset to the MAX77686 register addresses */
143 static const unsigned int max77686_map[REG_RTC_END] = {
144         [REG_RTC_CONTROLM]   = MAX77686_RTC_CONTROLM,
145         [REG_RTC_CONTROL]    = MAX77686_RTC_CONTROL,
146         [REG_RTC_UPDATE0]    = MAX77686_RTC_UPDATE0,
147         [REG_WTSR_SMPL_CNTL] = MAX77686_WTSR_SMPL_CNTL,
148         [REG_RTC_SEC]        = MAX77686_RTC_SEC,
149         [REG_RTC_MIN]        = MAX77686_RTC_MIN,
150         [REG_RTC_HOUR]       = MAX77686_RTC_HOUR,
151         [REG_RTC_WEEKDAY]    = MAX77686_RTC_WEEKDAY,
152         [REG_RTC_MONTH]      = MAX77686_RTC_MONTH,
153         [REG_RTC_YEAR]       = MAX77686_RTC_YEAR,
154         [REG_RTC_DATE]       = MAX77686_RTC_DATE,
155         [REG_ALARM1_SEC]     = MAX77686_ALARM1_SEC,
156         [REG_ALARM1_MIN]     = MAX77686_ALARM1_MIN,
157         [REG_ALARM1_HOUR]    = MAX77686_ALARM1_HOUR,
158         [REG_ALARM1_WEEKDAY] = MAX77686_ALARM1_WEEKDAY,
159         [REG_ALARM1_MONTH]   = MAX77686_ALARM1_MONTH,
160         [REG_ALARM1_YEAR]    = MAX77686_ALARM1_YEAR,
161         [REG_ALARM1_DATE]    = MAX77686_ALARM1_DATE,
162         [REG_ALARM2_SEC]     = MAX77686_ALARM2_SEC,
163         [REG_ALARM2_MIN]     = MAX77686_ALARM2_MIN,
164         [REG_ALARM2_HOUR]    = MAX77686_ALARM2_HOUR,
165         [REG_ALARM2_WEEKDAY] = MAX77686_ALARM2_WEEKDAY,
166         [REG_ALARM2_MONTH]   = MAX77686_ALARM2_MONTH,
167         [REG_ALARM2_YEAR]    = MAX77686_ALARM2_YEAR,
168         [REG_ALARM2_DATE]    = MAX77686_ALARM2_DATE,
169         [REG_RTC_AE1]        = REG_RTC_NONE,
170 };
171 
172 static const struct regmap_irq max77686_rtc_irqs[] = {
173         /* RTC interrupts */
174         REGMAP_IRQ_REG(0, 0, MAX77686_RTCINT_RTC60S_MSK),
175         REGMAP_IRQ_REG(1, 0, MAX77686_RTCINT_RTCA1_MSK),
176         REGMAP_IRQ_REG(2, 0, MAX77686_RTCINT_RTCA2_MSK),
177         REGMAP_IRQ_REG(3, 0, MAX77686_RTCINT_SMPL_MSK),
178         REGMAP_IRQ_REG(4, 0, MAX77686_RTCINT_RTC1S_MSK),
179         REGMAP_IRQ_REG(5, 0, MAX77686_RTCINT_WTSR_MSK),
180 };
181 
182 static const struct regmap_irq_chip max77686_rtc_irq_chip = {
183         .name           = "max77686-rtc",
184         .status_base    = MAX77686_RTC_INT,
185         .mask_base      = MAX77686_RTC_INTM,
186         .num_regs       = 1,
187         .irqs           = max77686_rtc_irqs,
188         .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
189 };
190 
191 static const struct max77686_rtc_driver_data max77686_drv_data = {
192         .delay = 16000,
193         .mask  = 0x7f,
194         .map   = max77686_map,
195         .alarm_enable_reg  = false,
196         .rtc_irq_from_platform = false,
197         .alarm_pending_status_reg = MAX77686_REG_STATUS2,
198         .rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
199         .rtc_irq_chip = &max77686_rtc_irq_chip,
200 };
201 
202 static const struct max77686_rtc_driver_data max77620_drv_data = {
203         .delay = 16000,
204         .mask  = 0x7f,
205         .map   = max77686_map,
206         .alarm_enable_reg  = false,
207         .rtc_irq_from_platform = true,
208         .alarm_pending_status_reg = MAX77686_INVALID_REG,
209         .rtc_i2c_addr = MAX77620_I2C_ADDR_RTC,
210         .rtc_irq_chip = &max77686_rtc_irq_chip,
211 };
212 
213 static const unsigned int max77802_map[REG_RTC_END] = {
214         [REG_RTC_CONTROLM]   = MAX77802_RTC_CONTROLM,
215         [REG_RTC_CONTROL]    = MAX77802_RTC_CONTROL,
216         [REG_RTC_UPDATE0]    = MAX77802_RTC_UPDATE0,
217         [REG_WTSR_SMPL_CNTL] = MAX77802_WTSR_SMPL_CNTL,
218         [REG_RTC_SEC]        = MAX77802_RTC_SEC,
219         [REG_RTC_MIN]        = MAX77802_RTC_MIN,
220         [REG_RTC_HOUR]       = MAX77802_RTC_HOUR,
221         [REG_RTC_WEEKDAY]    = MAX77802_RTC_WEEKDAY,
222         [REG_RTC_MONTH]      = MAX77802_RTC_MONTH,
223         [REG_RTC_YEAR]       = MAX77802_RTC_YEAR,
224         [REG_RTC_DATE]       = MAX77802_RTC_DATE,
225         [REG_ALARM1_SEC]     = MAX77802_ALARM1_SEC,
226         [REG_ALARM1_MIN]     = MAX77802_ALARM1_MIN,
227         [REG_ALARM1_HOUR]    = MAX77802_ALARM1_HOUR,
228         [REG_ALARM1_WEEKDAY] = MAX77802_ALARM1_WEEKDAY,
229         [REG_ALARM1_MONTH]   = MAX77802_ALARM1_MONTH,
230         [REG_ALARM1_YEAR]    = MAX77802_ALARM1_YEAR,
231         [REG_ALARM1_DATE]    = MAX77802_ALARM1_DATE,
232         [REG_ALARM2_SEC]     = MAX77802_ALARM2_SEC,
233         [REG_ALARM2_MIN]     = MAX77802_ALARM2_MIN,
234         [REG_ALARM2_HOUR]    = MAX77802_ALARM2_HOUR,
235         [REG_ALARM2_WEEKDAY] = MAX77802_ALARM2_WEEKDAY,
236         [REG_ALARM2_MONTH]   = MAX77802_ALARM2_MONTH,
237         [REG_ALARM2_YEAR]    = MAX77802_ALARM2_YEAR,
238         [REG_ALARM2_DATE]    = MAX77802_ALARM2_DATE,
239         [REG_RTC_AE1]        = MAX77802_RTC_AE1,
240 };
241 
242 static const struct regmap_irq_chip max77802_rtc_irq_chip = {
243         .name           = "max77802-rtc",
244         .status_base    = MAX77802_RTC_INT,
245         .mask_base      = MAX77802_RTC_INTM,
246         .num_regs       = 1,
247         .irqs           = max77686_rtc_irqs, /* same masks as 77686 */
248         .num_irqs       = ARRAY_SIZE(max77686_rtc_irqs),
249 };
250 
251 static const struct max77686_rtc_driver_data max77802_drv_data = {
252         .delay = 200,
253         .mask  = 0xff,
254         .map   = max77802_map,
255         .alarm_enable_reg  = true,
256         .rtc_irq_from_platform = false,
257         .alarm_pending_status_reg = MAX77686_REG_STATUS2,
258         .rtc_i2c_addr = MAX77686_INVALID_I2C_ADDR,
259         .rtc_irq_chip = &max77802_rtc_irq_chip,
260 };
261 
262 static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
263                                     struct max77686_rtc_info *info)
264 {
265         u8 mask = info->drv_data->mask;
266 
267         tm->tm_sec = data[RTC_SEC] & mask;
268         tm->tm_min = data[RTC_MIN] & mask;
269         if (info->rtc_24hr_mode) {
270                 tm->tm_hour = data[RTC_HOUR] & 0x1f;
271         } else {
272                 tm->tm_hour = data[RTC_HOUR] & 0x0f;
273                 if (data[RTC_HOUR] & HOUR_PM_MASK)
274                         tm->tm_hour += 12;
275         }
276 
277         /* Only a single bit is set in data[], so fls() would be equivalent */
278         tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
279         tm->tm_mday = data[RTC_DATE] & 0x1f;
280         tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
281         tm->tm_year = data[RTC_YEAR] & mask;
282         tm->tm_yday = 0;
283         tm->tm_isdst = 0;
284 
285         /*
286          * MAX77686 uses 1 bit from sec/min/hour/etc RTC registers and the
287          * year values are just 0..99 so add 100 to support up to 2099.
288          */
289         if (!info->drv_data->alarm_enable_reg)
290                 tm->tm_year += 100;
291 }
292 
293 static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
294                                    struct max77686_rtc_info *info)
295 {
296         data[RTC_SEC] = tm->tm_sec;
297         data[RTC_MIN] = tm->tm_min;
298         data[RTC_HOUR] = tm->tm_hour;
299         data[RTC_WEEKDAY] = 1 << tm->tm_wday;
300         data[RTC_DATE] = tm->tm_mday;
301         data[RTC_MONTH] = tm->tm_mon + 1;
302 
303         if (info->drv_data->alarm_enable_reg) {
304                 data[RTC_YEAR] = tm->tm_year;
305                 return 0;
306         }
307 
308         data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
309 
310         if (tm->tm_year < 100) {
311                 dev_err(info->dev, "RTC cannot handle the year %d.\n",
312                         1900 + tm->tm_year);
313                 return -EINVAL;
314         }
315 
316         return 0;
317 }
318 
319 static int max77686_rtc_update(struct max77686_rtc_info *info,
320                                enum MAX77686_RTC_OP op)
321 {
322         int ret;
323         unsigned int data;
324         unsigned long delay = info->drv_data->delay;
325 
326         if (op == MAX77686_RTC_WRITE)
327                 data = 1 << RTC_UDR_SHIFT;
328         else
329                 data = 1 << RTC_RBUDR_SHIFT;
330 
331         ret = regmap_update_bits(info->rtc_regmap,
332                                  info->drv_data->map[REG_RTC_UPDATE0],
333                                  data, data);
334         if (ret < 0)
335                 dev_err(info->dev, "Fail to write update reg(ret=%d, data=0x%x)\n",
336                         ret, data);
337         else {
338                 /* Minimum delay required before RTC update. */
339                 usleep_range(delay, delay * 2);
340         }
341 
342         return ret;
343 }
344 
345 static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
346 {
347         struct max77686_rtc_info *info = dev_get_drvdata(dev);
348         u8 data[RTC_NR_TIME];
349         int ret;
350 
351         mutex_lock(&info->lock);
352 
353         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
354         if (ret < 0)
355                 goto out;
356 
357         ret = regmap_bulk_read(info->rtc_regmap,
358                                info->drv_data->map[REG_RTC_SEC],
359                                data, ARRAY_SIZE(data));
360         if (ret < 0) {
361                 dev_err(info->dev, "Fail to read time reg(%d)\n", ret);
362                 goto out;
363         }
364 
365         max77686_rtc_data_to_tm(data, tm, info);
366 
367         ret = rtc_valid_tm(tm);
368 
369 out:
370         mutex_unlock(&info->lock);
371         return ret;
372 }
373 
374 static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
375 {
376         struct max77686_rtc_info *info = dev_get_drvdata(dev);
377         u8 data[RTC_NR_TIME];
378         int ret;
379 
380         ret = max77686_rtc_tm_to_data(tm, data, info);
381         if (ret < 0)
382                 return ret;
383 
384         mutex_lock(&info->lock);
385 
386         ret = regmap_bulk_write(info->rtc_regmap,
387                                 info->drv_data->map[REG_RTC_SEC],
388                                 data, ARRAY_SIZE(data));
389         if (ret < 0) {
390                 dev_err(info->dev, "Fail to write time reg(%d)\n", ret);
391                 goto out;
392         }
393 
394         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
395 
396 out:
397         mutex_unlock(&info->lock);
398         return ret;
399 }
400 
401 static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
402 {
403         struct max77686_rtc_info *info = dev_get_drvdata(dev);
404         u8 data[RTC_NR_TIME];
405         unsigned int val;
406         const unsigned int *map = info->drv_data->map;
407         int i, ret;
408 
409         mutex_lock(&info->lock);
410 
411         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
412         if (ret < 0)
413                 goto out;
414 
415         ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
416                                data, ARRAY_SIZE(data));
417         if (ret < 0) {
418                 dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
419                 goto out;
420         }
421 
422         max77686_rtc_data_to_tm(data, &alrm->time, info);
423 
424         alrm->enabled = 0;
425 
426         if (info->drv_data->alarm_enable_reg) {
427                 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
428                         ret = -EINVAL;
429                         dev_err(info->dev,
430                                 "alarm enable register not set(%d)\n", ret);
431                         goto out;
432                 }
433 
434                 ret = regmap_read(info->rtc_regmap, map[REG_RTC_AE1], &val);
435                 if (ret < 0) {
436                         dev_err(info->dev,
437                                 "fail to read alarm enable(%d)\n", ret);
438                         goto out;
439                 }
440 
441                 if (val)
442                         alrm->enabled = 1;
443         } else {
444                 for (i = 0; i < ARRAY_SIZE(data); i++) {
445                         if (data[i] & ALARM_ENABLE_MASK) {
446                                 alrm->enabled = 1;
447                                 break;
448                         }
449                 }
450         }
451 
452         alrm->pending = 0;
453 
454         if (info->drv_data->alarm_pending_status_reg == MAX77686_INVALID_REG)
455                 goto out;
456 
457         ret = regmap_read(info->regmap,
458                           info->drv_data->alarm_pending_status_reg, &val);
459         if (ret < 0) {
460                 dev_err(info->dev,
461                         "Fail to read alarm pending status reg(%d)\n", ret);
462                 goto out;
463         }
464 
465         if (val & (1 << 4)) /* RTCA1 */
466                 alrm->pending = 1;
467 
468 out:
469         mutex_unlock(&info->lock);
470         return ret;
471 }
472 
473 static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
474 {
475         u8 data[RTC_NR_TIME];
476         int ret, i;
477         struct rtc_time tm;
478         const unsigned int *map = info->drv_data->map;
479 
480         if (!mutex_is_locked(&info->lock))
481                 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
482 
483         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
484         if (ret < 0)
485                 goto out;
486 
487         if (info->drv_data->alarm_enable_reg) {
488                 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
489                         ret = -EINVAL;
490                         dev_err(info->dev,
491                                 "alarm enable register not set(%d)\n", ret);
492                         goto out;
493                 }
494 
495                 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1], 0);
496         } else {
497                 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
498                                        data, ARRAY_SIZE(data));
499                 if (ret < 0) {
500                         dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
501                         goto out;
502                 }
503 
504                 max77686_rtc_data_to_tm(data, &tm, info);
505 
506                 for (i = 0; i < ARRAY_SIZE(data); i++)
507                         data[i] &= ~ALARM_ENABLE_MASK;
508 
509                 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
510                                         data, ARRAY_SIZE(data));
511         }
512 
513         if (ret < 0) {
514                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
515                 goto out;
516         }
517 
518         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
519 out:
520         return ret;
521 }
522 
523 static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
524 {
525         u8 data[RTC_NR_TIME];
526         int ret;
527         struct rtc_time tm;
528         const unsigned int *map = info->drv_data->map;
529 
530         if (!mutex_is_locked(&info->lock))
531                 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
532 
533         ret = max77686_rtc_update(info, MAX77686_RTC_READ);
534         if (ret < 0)
535                 goto out;
536 
537         if (info->drv_data->alarm_enable_reg) {
538                 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1],
539                                    MAX77802_ALARM_ENABLE_VALUE);
540         } else {
541                 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
542                                        data, ARRAY_SIZE(data));
543                 if (ret < 0) {
544                         dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
545                         goto out;
546                 }
547 
548                 max77686_rtc_data_to_tm(data, &tm, info);
549 
550                 data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
551                 data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
552                 data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
553                 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
554                 if (data[RTC_MONTH] & 0xf)
555                         data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
556                 if (data[RTC_YEAR] & info->drv_data->mask)
557                         data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
558                 if (data[RTC_DATE] & 0x1f)
559                         data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
560 
561                 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
562                                         data, ARRAY_SIZE(data));
563         }
564 
565         if (ret < 0) {
566                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
567                 goto out;
568         }
569 
570         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
571 out:
572         return ret;
573 }
574 
575 static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
576 {
577         struct max77686_rtc_info *info = dev_get_drvdata(dev);
578         u8 data[RTC_NR_TIME];
579         int ret;
580 
581         ret = max77686_rtc_tm_to_data(&alrm->time, data, info);
582         if (ret < 0)
583                 return ret;
584 
585         mutex_lock(&info->lock);
586 
587         ret = max77686_rtc_stop_alarm(info);
588         if (ret < 0)
589                 goto out;
590 
591         ret = regmap_bulk_write(info->rtc_regmap,
592                                 info->drv_data->map[REG_ALARM1_SEC],
593                                 data, ARRAY_SIZE(data));
594 
595         if (ret < 0) {
596                 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
597                 goto out;
598         }
599 
600         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
601         if (ret < 0)
602                 goto out;
603 
604         if (alrm->enabled)
605                 ret = max77686_rtc_start_alarm(info);
606 out:
607         mutex_unlock(&info->lock);
608         return ret;
609 }
610 
611 static int max77686_rtc_alarm_irq_enable(struct device *dev,
612                                          unsigned int enabled)
613 {
614         struct max77686_rtc_info *info = dev_get_drvdata(dev);
615         int ret;
616 
617         mutex_lock(&info->lock);
618         if (enabled)
619                 ret = max77686_rtc_start_alarm(info);
620         else
621                 ret = max77686_rtc_stop_alarm(info);
622         mutex_unlock(&info->lock);
623 
624         return ret;
625 }
626 
627 static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
628 {
629         struct max77686_rtc_info *info = data;
630 
631         dev_dbg(info->dev, "RTC alarm IRQ: %d\n", irq);
632 
633         rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
634 
635         return IRQ_HANDLED;
636 }
637 
638 static const struct rtc_class_ops max77686_rtc_ops = {
639         .read_time = max77686_rtc_read_time,
640         .set_time = max77686_rtc_set_time,
641         .read_alarm = max77686_rtc_read_alarm,
642         .set_alarm = max77686_rtc_set_alarm,
643         .alarm_irq_enable = max77686_rtc_alarm_irq_enable,
644 };
645 
646 static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
647 {
648         u8 data[2];
649         int ret;
650 
651         /* Set RTC control register : Binary mode, 24hour mdoe */
652         data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
653         data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
654 
655         info->rtc_24hr_mode = 1;
656 
657         ret = regmap_bulk_write(info->rtc_regmap,
658                                 info->drv_data->map[REG_RTC_CONTROLM],
659                                 data, ARRAY_SIZE(data));
660         if (ret < 0) {
661                 dev_err(info->dev, "Fail to write controlm reg(%d)\n", ret);
662                 return ret;
663         }
664 
665         ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
666         return ret;
667 }
668 
669 static const struct regmap_config max77686_rtc_regmap_config = {
670         .reg_bits = 8,
671         .val_bits = 8,
672 };
673 
674 static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
675 {
676         struct device *parent = info->dev->parent;
677         struct i2c_client *parent_i2c = to_i2c_client(parent);
678         int ret;
679 
680         if (info->drv_data->rtc_irq_from_platform) {
681                 struct platform_device *pdev = to_platform_device(info->dev);
682 
683                 info->rtc_irq = platform_get_irq(pdev, 0);
684                 if (info->rtc_irq < 0) {
685                         dev_err(info->dev, "Failed to get rtc interrupts: %d\n",
686                                 info->rtc_irq);
687                         return info->rtc_irq;
688                 }
689         } else {
690                 info->rtc_irq =  parent_i2c->irq;
691         }
692 
693         info->regmap = dev_get_regmap(parent, NULL);
694         if (!info->regmap) {
695                 dev_err(info->dev, "Failed to get rtc regmap\n");
696                 return -ENODEV;
697         }
698 
699         if (info->drv_data->rtc_i2c_addr == MAX77686_INVALID_I2C_ADDR) {
700                 info->rtc_regmap = info->regmap;
701                 goto add_rtc_irq;
702         }
703 
704         info->rtc = i2c_new_dummy(parent_i2c->adapter,
705                                   info->drv_data->rtc_i2c_addr);
706         if (!info->rtc) {
707                 dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
708                 return -ENODEV;
709         }
710 
711         info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
712                                                 &max77686_rtc_regmap_config);
713         if (IS_ERR(info->rtc_regmap)) {
714                 ret = PTR_ERR(info->rtc_regmap);
715                 dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
716                 goto err_unregister_i2c;
717         }
718 
719 add_rtc_irq:
720         ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq,
721                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
722                                   IRQF_SHARED, 0, info->drv_data->rtc_irq_chip,
723                                   &info->rtc_irq_data);
724         if (ret < 0) {
725                 dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
726                 goto err_unregister_i2c;
727         }
728 
729         return 0;
730 
731 err_unregister_i2c:
732         if (info->rtc)
733                 i2c_unregister_device(info->rtc);
734         return ret;
735 }
736 
737 static int max77686_rtc_probe(struct platform_device *pdev)
738 {
739         struct max77686_rtc_info *info;
740         const struct platform_device_id *id = platform_get_device_id(pdev);
741         int ret;
742 
743         info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
744                             GFP_KERNEL);
745         if (!info)
746                 return -ENOMEM;
747 
748         mutex_init(&info->lock);
749         info->dev = &pdev->dev;
750         info->drv_data = (const struct max77686_rtc_driver_data *)
751                 id->driver_data;
752 
753         ret = max77686_init_rtc_regmap(info);
754         if (ret < 0)
755                 return ret;
756 
757         platform_set_drvdata(pdev, info);
758 
759         ret = max77686_rtc_init_reg(info);
760         if (ret < 0) {
761                 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
762                 goto err_rtc;
763         }
764 
765         device_init_wakeup(&pdev->dev, 1);
766 
767         info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
768                                         &max77686_rtc_ops, THIS_MODULE);
769 
770         if (IS_ERR(info->rtc_dev)) {
771                 ret = PTR_ERR(info->rtc_dev);
772                 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
773                 if (ret == 0)
774                         ret = -EINVAL;
775                 goto err_rtc;
776         }
777 
778         info->virq = regmap_irq_get_virq(info->rtc_irq_data,
779                                          MAX77686_RTCIRQ_RTCA1);
780         if (info->virq <= 0) {
781                 ret = -ENXIO;
782                 goto err_rtc;
783         }
784 
785         ret = request_threaded_irq(info->virq, NULL, max77686_rtc_alarm_irq, 0,
786                                    "rtc-alarm1", info);
787         if (ret < 0) {
788                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
789                         info->virq, ret);
790                 goto err_rtc;
791         }
792 
793         return 0;
794 
795 err_rtc:
796         regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
797         if (info->rtc)
798                 i2c_unregister_device(info->rtc);
799 
800         return ret;
801 }
802 
803 static int max77686_rtc_remove(struct platform_device *pdev)
804 {
805         struct max77686_rtc_info *info = platform_get_drvdata(pdev);
806 
807         free_irq(info->virq, info);
808         regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
809         if (info->rtc)
810                 i2c_unregister_device(info->rtc);
811 
812         return 0;
813 }
814 
815 #ifdef CONFIG_PM_SLEEP
816 static int max77686_rtc_suspend(struct device *dev)
817 {
818         if (device_may_wakeup(dev)) {
819                 struct max77686_rtc_info *info = dev_get_drvdata(dev);
820 
821                 return enable_irq_wake(info->virq);
822         }
823 
824         return 0;
825 }
826 
827 static int max77686_rtc_resume(struct device *dev)
828 {
829         if (device_may_wakeup(dev)) {
830                 struct max77686_rtc_info *info = dev_get_drvdata(dev);
831 
832                 return disable_irq_wake(info->virq);
833         }
834 
835         return 0;
836 }
837 #endif
838 
839 static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
840                          max77686_rtc_suspend, max77686_rtc_resume);
841 
842 static const struct platform_device_id rtc_id[] = {
843         { "max77686-rtc", .driver_data = (kernel_ulong_t)&max77686_drv_data, },
844         { "max77802-rtc", .driver_data = (kernel_ulong_t)&max77802_drv_data, },
845         { "max77620-rtc", .driver_data = (kernel_ulong_t)&max77620_drv_data, },
846         {},
847 };
848 MODULE_DEVICE_TABLE(platform, rtc_id);
849 
850 static struct platform_driver max77686_rtc_driver = {
851         .driver         = {
852                 .name   = "max77686-rtc",
853                 .pm     = &max77686_rtc_pm_ops,
854         },
855         .probe          = max77686_rtc_probe,
856         .remove         = max77686_rtc_remove,
857         .id_table       = rtc_id,
858 };
859 
860 module_platform_driver(max77686_rtc_driver);
861 
862 MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
863 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
864 MODULE_LICENSE("GPL");
865 

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