1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // RTC driver for Maxim MAX77686 and MAX77802
4 //
5 // Copyright (C) 2012 Samsung Electronics Co.Ltd
6 //
7 // based on rtc-max8997.c
8
9 #include <linux/i2c.h>
10 #include <linux/slab.h>
11 #include <linux/rtc.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/mfd/max77686-private.h>
17 #include <linux/irqdomain.h>
18 #include <linux/regmap.h>
19
20 #define MAX77686_I2C_ADDR_RTC (0x0C >> 1)
21 #define MAX77620_I2C_ADDR_RTC 0x68
22 #define MAX77686_INVALID_I2C_ADDR (-1)
23
24 /* Define non existing register */
25 #define MAX77686_INVALID_REG (-1)
26
27 /* RTC Control Register */
28 #define BCD_EN_SHIFT 0
29 #define BCD_EN_MASK BIT(BCD_EN_SHIFT)
30 #define MODEL24_SHIFT 1
31 #define MODEL24_MASK BIT(MODEL24_SHIFT)
32 /* RTC Update Register1 */
33 #define RTC_UDR_SHIFT 0
34 #define RTC_UDR_MASK BIT(RTC_UDR_SHIFT)
35 #define RTC_RBUDR_SHIFT 4
36 #define RTC_RBUDR_MASK BIT(RTC_RBUDR_SHIFT)
37 /* RTC Hour register */
38 #define HOUR_PM_SHIFT 6
39 #define HOUR_PM_MASK BIT(HOUR_PM_SHIFT)
40 /* RTC Alarm Enable */
41 #define ALARM_ENABLE_SHIFT 7
42 #define ALARM_ENABLE_MASK BIT(ALARM_ENABLE_SHIFT)
43
44 #define REG_RTC_NONE 0xdeadbeef
45
46 /*
47 * MAX77802 has separate register (RTCAE1) for alarm enable instead
48 * using 1 bit from registers RTC{SEC,MIN,HOUR,DAY,MONTH,YEAR,DATE}
49 * as in done in MAX77686.
50 */
51 #define MAX77802_ALARM_ENABLE_VALUE 0x77
52
53 enum {
54 RTC_SEC = 0,
55 RTC_MIN,
56 RTC_HOUR,
57 RTC_WEEKDAY,
58 RTC_MONTH,
59 RTC_YEAR,
60 RTC_DATE,
61 RTC_NR_TIME
62 };
63
64 struct max77686_rtc_driver_data {
65 /* Minimum usecs needed for a RTC update */
66 unsigned long delay;
67 /* Mask used to read RTC registers value */
68 u8 mask;
69 /* Registers offset to I2C addresses map */
70 const unsigned int *map;
71 /* Has a separate alarm enable register? */
72 bool alarm_enable_reg;
73 /* I2C address for RTC block */
74 int rtc_i2c_addr;
75 /* RTC interrupt via platform resource */
76 bool rtc_irq_from_platform;
77 /* Pending alarm status register */
78 int alarm_pending_status_reg;
79 /* RTC IRQ CHIP for regmap */
80 const struct regmap_irq_chip *rtc_irq_chip;
81 };
82
83 struct max77686_rtc_info {
84 struct device *dev;
85 struct i2c_client *rtc;
86 struct rtc_device *rtc_dev;
87 struct mutex lock;
88
89 struct regmap *regmap;
90 struct regmap *rtc_regmap;
91
92 const struct max77686_rtc_driver_data *drv_data;
93 struct regmap_irq_chip_data *rtc_irq_data;
94
95 int rtc_irq;
96 int virq;
97 int rtc_24hr_mode;
98 };
99
100 enum MAX77686_RTC_OP {
101 MAX77686_RTC_WRITE,
102 MAX77686_RTC_READ,
103 };
104
105 /* These are not registers but just offsets that are mapped to addresses */
106 enum max77686_rtc_reg_offset {
107 REG_RTC_CONTROLM = 0,
108 REG_RTC_CONTROL,
109 REG_RTC_UPDATE0,
110 REG_WTSR_SMPL_CNTL,
111 REG_RTC_SEC,
112 REG_RTC_MIN,
113 REG_RTC_HOUR,
114 REG_RTC_WEEKDAY,
115 REG_RTC_MONTH,
116 REG_RTC_YEAR,
117 REG_RTC_DATE,
118 REG_ALARM1_SEC,
119 REG_ALARM1_MIN,
120 REG_ALARM1_HOUR,
121 REG_ALARM1_WEEKDAY,
122 REG_ALARM1_MONTH,
123 REG_ALARM1_YEAR,
124 REG_ALARM1_DATE,
125 REG_ALARM2_SEC,
126 REG_ALARM2_MIN,
127 REG_ALARM2_HOUR,
128 REG_ALARM2_WEEKDAY,
129 REG_ALARM2_MONTH,
130 REG_ALARM2_YEAR,
131 REG_ALARM2_DATE,
132 REG_RTC_AE1,
133 REG_RTC_END,
134 };
135
136 /* Maps RTC registers offset to the MAX77686 register addresses */
137 static const unsigned int max77686_map[REG_RTC_END] = {
138 [REG_RTC_CONTROLM] = MAX77686_RTC_CONTROLM,
139 [REG_RTC_CONTROL] = MAX77686_RTC_CONTROL,
140 [REG_RTC_UPDATE0] = MAX77686_RTC_UPDATE0,
141 [REG_WTSR_SMPL_CNTL] = MAX77686_WTSR_SMPL_CNTL,
142 [REG_RTC_SEC] = MAX77686_RTC_SEC,
143 [REG_RTC_MIN] = MAX77686_RTC_MIN,
144 [REG_RTC_HOUR] = MAX77686_RTC_HOUR,
145 [REG_RTC_WEEKDAY] = MAX77686_RTC_WEEKDAY,
146 [REG_RTC_MONTH] = MAX77686_RTC_MONTH,
147 [REG_RTC_YEAR] = MAX77686_RTC_YEAR,
148 [REG_RTC_DATE] = MAX77686_RTC_DATE,
149 [REG_ALARM1_SEC] = MAX77686_ALARM1_SEC,
150 [REG_ALARM1_MIN] = MAX77686_ALARM1_MIN,
151 [REG_ALARM1_HOUR] = MAX77686_ALARM1_HOUR,
152 [REG_ALARM1_WEEKDAY] = MAX77686_ALARM1_WEEKDAY,
153 [REG_ALARM1_MONTH] = MAX77686_ALARM1_MONTH,
154 [REG_ALARM1_YEAR] = MAX77686_ALARM1_YEAR,
155 [REG_ALARM1_DATE] = MAX77686_ALARM1_DATE,
156 [REG_ALARM2_SEC] = MAX77686_ALARM2_SEC,
157 [REG_ALARM2_MIN] = MAX77686_ALARM2_MIN,
158 [REG_ALARM2_HOUR] = MAX77686_ALARM2_HOUR,
159 [REG_ALARM2_WEEKDAY] = MAX77686_ALARM2_WEEKDAY,
160 [REG_ALARM2_MONTH] = MAX77686_ALARM2_MONTH,
161 [REG_ALARM2_YEAR] = MAX77686_ALARM2_YEAR,
162 [REG_ALARM2_DATE] = MAX77686_ALARM2_DATE,
163 [REG_RTC_AE1] = REG_RTC_NONE,
164 };
165
166 static const struct regmap_irq max77686_rtc_irqs[] = {
167 /* RTC interrupts */
168 REGMAP_IRQ_REG(0, 0, MAX77686_RTCINT_RTC60S_MSK),
169 REGMAP_IRQ_REG(1, 0, MAX77686_RTCINT_RTCA1_MSK),
170 REGMAP_IRQ_REG(2, 0, MAX77686_RTCINT_RTCA2_MSK),
171 REGMAP_IRQ_REG(3, 0, MAX77686_RTCINT_SMPL_MSK),
172 REGMAP_IRQ_REG(4, 0, MAX77686_RTCINT_RTC1S_MSK),
173 REGMAP_IRQ_REG(5, 0, MAX77686_RTCINT_WTSR_MSK),
174 };
175
176 static const struct regmap_irq_chip max77686_rtc_irq_chip = {
177 .name = "max77686-rtc",
178 .status_base = MAX77686_RTC_INT,
179 .mask_base = MAX77686_RTC_INTM,
180 .num_regs = 1,
181 .irqs = max77686_rtc_irqs,
182 .num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
183 };
184
185 static const struct max77686_rtc_driver_data max77686_drv_data = {
186 .delay = 16000,
187 .mask = 0x7f,
188 .map = max77686_map,
189 .alarm_enable_reg = false,
190 .rtc_irq_from_platform = false,
191 .alarm_pending_status_reg = MAX77686_REG_STATUS2,
192 .rtc_i2c_addr = MAX77686_I2C_ADDR_RTC,
193 .rtc_irq_chip = &max77686_rtc_irq_chip,
194 };
195
196 static const struct max77686_rtc_driver_data max77620_drv_data = {
197 .delay = 16000,
198 .mask = 0x7f,
199 .map = max77686_map,
200 .alarm_enable_reg = false,
201 .rtc_irq_from_platform = true,
202 .alarm_pending_status_reg = MAX77686_INVALID_REG,
203 .rtc_i2c_addr = MAX77620_I2C_ADDR_RTC,
204 .rtc_irq_chip = &max77686_rtc_irq_chip,
205 };
206
207 static const unsigned int max77802_map[REG_RTC_END] = {
208 [REG_RTC_CONTROLM] = MAX77802_RTC_CONTROLM,
209 [REG_RTC_CONTROL] = MAX77802_RTC_CONTROL,
210 [REG_RTC_UPDATE0] = MAX77802_RTC_UPDATE0,
211 [REG_WTSR_SMPL_CNTL] = MAX77802_WTSR_SMPL_CNTL,
212 [REG_RTC_SEC] = MAX77802_RTC_SEC,
213 [REG_RTC_MIN] = MAX77802_RTC_MIN,
214 [REG_RTC_HOUR] = MAX77802_RTC_HOUR,
215 [REG_RTC_WEEKDAY] = MAX77802_RTC_WEEKDAY,
216 [REG_RTC_MONTH] = MAX77802_RTC_MONTH,
217 [REG_RTC_YEAR] = MAX77802_RTC_YEAR,
218 [REG_RTC_DATE] = MAX77802_RTC_DATE,
219 [REG_ALARM1_SEC] = MAX77802_ALARM1_SEC,
220 [REG_ALARM1_MIN] = MAX77802_ALARM1_MIN,
221 [REG_ALARM1_HOUR] = MAX77802_ALARM1_HOUR,
222 [REG_ALARM1_WEEKDAY] = MAX77802_ALARM1_WEEKDAY,
223 [REG_ALARM1_MONTH] = MAX77802_ALARM1_MONTH,
224 [REG_ALARM1_YEAR] = MAX77802_ALARM1_YEAR,
225 [REG_ALARM1_DATE] = MAX77802_ALARM1_DATE,
226 [REG_ALARM2_SEC] = MAX77802_ALARM2_SEC,
227 [REG_ALARM2_MIN] = MAX77802_ALARM2_MIN,
228 [REG_ALARM2_HOUR] = MAX77802_ALARM2_HOUR,
229 [REG_ALARM2_WEEKDAY] = MAX77802_ALARM2_WEEKDAY,
230 [REG_ALARM2_MONTH] = MAX77802_ALARM2_MONTH,
231 [REG_ALARM2_YEAR] = MAX77802_ALARM2_YEAR,
232 [REG_ALARM2_DATE] = MAX77802_ALARM2_DATE,
233 [REG_RTC_AE1] = MAX77802_RTC_AE1,
234 };
235
236 static const struct regmap_irq_chip max77802_rtc_irq_chip = {
237 .name = "max77802-rtc",
238 .status_base = MAX77802_RTC_INT,
239 .mask_base = MAX77802_RTC_INTM,
240 .num_regs = 1,
241 .irqs = max77686_rtc_irqs, /* same masks as 77686 */
242 .num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
243 };
244
245 static const struct max77686_rtc_driver_data max77802_drv_data = {
246 .delay = 200,
247 .mask = 0xff,
248 .map = max77802_map,
249 .alarm_enable_reg = true,
250 .rtc_irq_from_platform = false,
251 .alarm_pending_status_reg = MAX77686_REG_STATUS2,
252 .rtc_i2c_addr = MAX77686_INVALID_I2C_ADDR,
253 .rtc_irq_chip = &max77802_rtc_irq_chip,
254 };
255
max77686_rtc_data_to_tm(u8 * data,struct rtc_time * tm,struct max77686_rtc_info * info)256 static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
257 struct max77686_rtc_info *info)
258 {
259 u8 mask = info->drv_data->mask;
260
261 tm->tm_sec = data[RTC_SEC] & mask;
262 tm->tm_min = data[RTC_MIN] & mask;
263 if (info->rtc_24hr_mode) {
264 tm->tm_hour = data[RTC_HOUR] & 0x1f;
265 } else {
266 tm->tm_hour = data[RTC_HOUR] & 0x0f;
267 if (data[RTC_HOUR] & HOUR_PM_MASK)
268 tm->tm_hour += 12;
269 }
270
271 /* Only a single bit is set in data[], so fls() would be equivalent */
272 tm->tm_wday = ffs(data[RTC_WEEKDAY] & mask) - 1;
273 tm->tm_mday = data[RTC_DATE] & 0x1f;
274 tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
275 tm->tm_year = data[RTC_YEAR] & mask;
276 tm->tm_yday = 0;
277 tm->tm_isdst = 0;
278
279 /*
280 * MAX77686 uses 1 bit from sec/min/hour/etc RTC registers and the
281 * year values are just 0..99 so add 100 to support up to 2099.
282 */
283 if (!info->drv_data->alarm_enable_reg)
284 tm->tm_year += 100;
285 }
286
max77686_rtc_tm_to_data(struct rtc_time * tm,u8 * data,struct max77686_rtc_info * info)287 static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data,
288 struct max77686_rtc_info *info)
289 {
290 data[RTC_SEC] = tm->tm_sec;
291 data[RTC_MIN] = tm->tm_min;
292 data[RTC_HOUR] = tm->tm_hour;
293 data[RTC_WEEKDAY] = 1 << tm->tm_wday;
294 data[RTC_DATE] = tm->tm_mday;
295 data[RTC_MONTH] = tm->tm_mon + 1;
296
297 if (info->drv_data->alarm_enable_reg) {
298 data[RTC_YEAR] = tm->tm_year;
299 return 0;
300 }
301
302 data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
303
304 if (tm->tm_year < 100) {
305 dev_err(info->dev, "RTC cannot handle the year %d.\n",
306 1900 + tm->tm_year);
307 return -EINVAL;
308 }
309
310 return 0;
311 }
312
max77686_rtc_update(struct max77686_rtc_info * info,enum MAX77686_RTC_OP op)313 static int max77686_rtc_update(struct max77686_rtc_info *info,
314 enum MAX77686_RTC_OP op)
315 {
316 int ret;
317 unsigned int data;
318 unsigned long delay = info->drv_data->delay;
319
320 if (op == MAX77686_RTC_WRITE)
321 data = 1 << RTC_UDR_SHIFT;
322 else
323 data = 1 << RTC_RBUDR_SHIFT;
324
325 ret = regmap_update_bits(info->rtc_regmap,
326 info->drv_data->map[REG_RTC_UPDATE0],
327 data, data);
328 if (ret < 0)
329 dev_err(info->dev, "Fail to write update reg(ret=%d, data=0x%x)\n",
330 ret, data);
331 else {
332 /* Minimum delay required before RTC update. */
333 usleep_range(delay, delay * 2);
334 }
335
336 return ret;
337 }
338
max77686_rtc_read_time(struct device * dev,struct rtc_time * tm)339 static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
340 {
341 struct max77686_rtc_info *info = dev_get_drvdata(dev);
342 u8 data[RTC_NR_TIME];
343 int ret;
344
345 mutex_lock(&info->lock);
346
347 ret = max77686_rtc_update(info, MAX77686_RTC_READ);
348 if (ret < 0)
349 goto out;
350
351 ret = regmap_bulk_read(info->rtc_regmap,
352 info->drv_data->map[REG_RTC_SEC],
353 data, ARRAY_SIZE(data));
354 if (ret < 0) {
355 dev_err(info->dev, "Fail to read time reg(%d)\n", ret);
356 goto out;
357 }
358
359 max77686_rtc_data_to_tm(data, tm, info);
360
361 out:
362 mutex_unlock(&info->lock);
363 return 0;
364 }
365
max77686_rtc_set_time(struct device * dev,struct rtc_time * tm)366 static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
367 {
368 struct max77686_rtc_info *info = dev_get_drvdata(dev);
369 u8 data[RTC_NR_TIME];
370 int ret;
371
372 ret = max77686_rtc_tm_to_data(tm, data, info);
373 if (ret < 0)
374 return ret;
375
376 mutex_lock(&info->lock);
377
378 ret = regmap_bulk_write(info->rtc_regmap,
379 info->drv_data->map[REG_RTC_SEC],
380 data, ARRAY_SIZE(data));
381 if (ret < 0) {
382 dev_err(info->dev, "Fail to write time reg(%d)\n", ret);
383 goto out;
384 }
385
386 ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
387
388 out:
389 mutex_unlock(&info->lock);
390 return ret;
391 }
392
max77686_rtc_read_alarm(struct device * dev,struct rtc_wkalrm * alrm)393 static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
394 {
395 struct max77686_rtc_info *info = dev_get_drvdata(dev);
396 u8 data[RTC_NR_TIME];
397 unsigned int val;
398 const unsigned int *map = info->drv_data->map;
399 int i, ret;
400
401 mutex_lock(&info->lock);
402
403 ret = max77686_rtc_update(info, MAX77686_RTC_READ);
404 if (ret < 0)
405 goto out;
406
407 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
408 data, ARRAY_SIZE(data));
409 if (ret < 0) {
410 dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
411 goto out;
412 }
413
414 max77686_rtc_data_to_tm(data, &alrm->time, info);
415
416 alrm->enabled = 0;
417
418 if (info->drv_data->alarm_enable_reg) {
419 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
420 ret = -EINVAL;
421 dev_err(info->dev,
422 "alarm enable register not set(%d)\n", ret);
423 goto out;
424 }
425
426 ret = regmap_read(info->rtc_regmap, map[REG_RTC_AE1], &val);
427 if (ret < 0) {
428 dev_err(info->dev,
429 "fail to read alarm enable(%d)\n", ret);
430 goto out;
431 }
432
433 if (val)
434 alrm->enabled = 1;
435 } else {
436 for (i = 0; i < ARRAY_SIZE(data); i++) {
437 if (data[i] & ALARM_ENABLE_MASK) {
438 alrm->enabled = 1;
439 break;
440 }
441 }
442 }
443
444 alrm->pending = 0;
445
446 if (info->drv_data->alarm_pending_status_reg == MAX77686_INVALID_REG)
447 goto out;
448
449 ret = regmap_read(info->regmap,
450 info->drv_data->alarm_pending_status_reg, &val);
451 if (ret < 0) {
452 dev_err(info->dev,
453 "Fail to read alarm pending status reg(%d)\n", ret);
454 goto out;
455 }
456
457 if (val & (1 << 4)) /* RTCA1 */
458 alrm->pending = 1;
459
460 out:
461 mutex_unlock(&info->lock);
462 return ret;
463 }
464
max77686_rtc_stop_alarm(struct max77686_rtc_info * info)465 static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
466 {
467 u8 data[RTC_NR_TIME];
468 int ret, i;
469 struct rtc_time tm;
470 const unsigned int *map = info->drv_data->map;
471
472 if (!mutex_is_locked(&info->lock))
473 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
474
475 ret = max77686_rtc_update(info, MAX77686_RTC_READ);
476 if (ret < 0)
477 goto out;
478
479 if (info->drv_data->alarm_enable_reg) {
480 if (map[REG_RTC_AE1] == REG_RTC_NONE) {
481 ret = -EINVAL;
482 dev_err(info->dev,
483 "alarm enable register not set(%d)\n", ret);
484 goto out;
485 }
486
487 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1], 0);
488 } else {
489 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
490 data, ARRAY_SIZE(data));
491 if (ret < 0) {
492 dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
493 goto out;
494 }
495
496 max77686_rtc_data_to_tm(data, &tm, info);
497
498 for (i = 0; i < ARRAY_SIZE(data); i++)
499 data[i] &= ~ALARM_ENABLE_MASK;
500
501 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
502 data, ARRAY_SIZE(data));
503 }
504
505 if (ret < 0) {
506 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
507 goto out;
508 }
509
510 ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
511 out:
512 return ret;
513 }
514
max77686_rtc_start_alarm(struct max77686_rtc_info * info)515 static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
516 {
517 u8 data[RTC_NR_TIME];
518 int ret;
519 struct rtc_time tm;
520 const unsigned int *map = info->drv_data->map;
521
522 if (!mutex_is_locked(&info->lock))
523 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
524
525 ret = max77686_rtc_update(info, MAX77686_RTC_READ);
526 if (ret < 0)
527 goto out;
528
529 if (info->drv_data->alarm_enable_reg) {
530 ret = regmap_write(info->rtc_regmap, map[REG_RTC_AE1],
531 MAX77802_ALARM_ENABLE_VALUE);
532 } else {
533 ret = regmap_bulk_read(info->rtc_regmap, map[REG_ALARM1_SEC],
534 data, ARRAY_SIZE(data));
535 if (ret < 0) {
536 dev_err(info->dev, "Fail to read alarm reg(%d)\n", ret);
537 goto out;
538 }
539
540 max77686_rtc_data_to_tm(data, &tm, info);
541
542 data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
543 data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
544 data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
545 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
546 if (data[RTC_MONTH] & 0xf)
547 data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
548 if (data[RTC_YEAR] & info->drv_data->mask)
549 data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
550 if (data[RTC_DATE] & 0x1f)
551 data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
552
553 ret = regmap_bulk_write(info->rtc_regmap, map[REG_ALARM1_SEC],
554 data, ARRAY_SIZE(data));
555 }
556
557 if (ret < 0) {
558 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
559 goto out;
560 }
561
562 ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
563 out:
564 return ret;
565 }
566
max77686_rtc_set_alarm(struct device * dev,struct rtc_wkalrm * alrm)567 static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
568 {
569 struct max77686_rtc_info *info = dev_get_drvdata(dev);
570 u8 data[RTC_NR_TIME];
571 int ret;
572
573 ret = max77686_rtc_tm_to_data(&alrm->time, data, info);
574 if (ret < 0)
575 return ret;
576
577 mutex_lock(&info->lock);
578
579 ret = max77686_rtc_stop_alarm(info);
580 if (ret < 0)
581 goto out;
582
583 ret = regmap_bulk_write(info->rtc_regmap,
584 info->drv_data->map[REG_ALARM1_SEC],
585 data, ARRAY_SIZE(data));
586
587 if (ret < 0) {
588 dev_err(info->dev, "Fail to write alarm reg(%d)\n", ret);
589 goto out;
590 }
591
592 ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
593 if (ret < 0)
594 goto out;
595
596 if (alrm->enabled)
597 ret = max77686_rtc_start_alarm(info);
598 out:
599 mutex_unlock(&info->lock);
600 return ret;
601 }
602
max77686_rtc_alarm_irq_enable(struct device * dev,unsigned int enabled)603 static int max77686_rtc_alarm_irq_enable(struct device *dev,
604 unsigned int enabled)
605 {
606 struct max77686_rtc_info *info = dev_get_drvdata(dev);
607 int ret;
608
609 mutex_lock(&info->lock);
610 if (enabled)
611 ret = max77686_rtc_start_alarm(info);
612 else
613 ret = max77686_rtc_stop_alarm(info);
614 mutex_unlock(&info->lock);
615
616 return ret;
617 }
618
max77686_rtc_alarm_irq(int irq,void * data)619 static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
620 {
621 struct max77686_rtc_info *info = data;
622
623 dev_dbg(info->dev, "RTC alarm IRQ: %d\n", irq);
624
625 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
626
627 return IRQ_HANDLED;
628 }
629
630 static const struct rtc_class_ops max77686_rtc_ops = {
631 .read_time = max77686_rtc_read_time,
632 .set_time = max77686_rtc_set_time,
633 .read_alarm = max77686_rtc_read_alarm,
634 .set_alarm = max77686_rtc_set_alarm,
635 .alarm_irq_enable = max77686_rtc_alarm_irq_enable,
636 };
637
max77686_rtc_init_reg(struct max77686_rtc_info * info)638 static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
639 {
640 u8 data[2];
641 int ret;
642
643 /* Set RTC control register : Binary mode, 24hour mdoe */
644 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
645 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
646
647 info->rtc_24hr_mode = 1;
648
649 ret = regmap_bulk_write(info->rtc_regmap,
650 info->drv_data->map[REG_RTC_CONTROLM],
651 data, ARRAY_SIZE(data));
652 if (ret < 0) {
653 dev_err(info->dev, "Fail to write controlm reg(%d)\n", ret);
654 return ret;
655 }
656
657 ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
658 return ret;
659 }
660
661 static const struct regmap_config max77686_rtc_regmap_config = {
662 .reg_bits = 8,
663 .val_bits = 8,
664 };
665
max77686_init_rtc_regmap(struct max77686_rtc_info * info)666 static int max77686_init_rtc_regmap(struct max77686_rtc_info *info)
667 {
668 struct device *parent = info->dev->parent;
669 struct i2c_client *parent_i2c = to_i2c_client(parent);
670 int ret;
671
672 if (info->drv_data->rtc_irq_from_platform) {
673 struct platform_device *pdev = to_platform_device(info->dev);
674
675 info->rtc_irq = platform_get_irq(pdev, 0);
676 if (info->rtc_irq < 0) {
677 dev_err(info->dev, "Failed to get rtc interrupts: %d\n",
678 info->rtc_irq);
679 return info->rtc_irq;
680 }
681 } else {
682 info->rtc_irq = parent_i2c->irq;
683 }
684
685 info->regmap = dev_get_regmap(parent, NULL);
686 if (!info->regmap) {
687 dev_err(info->dev, "Failed to get rtc regmap\n");
688 return -ENODEV;
689 }
690
691 if (info->drv_data->rtc_i2c_addr == MAX77686_INVALID_I2C_ADDR) {
692 info->rtc_regmap = info->regmap;
693 goto add_rtc_irq;
694 }
695
696 info->rtc = i2c_new_dummy(parent_i2c->adapter,
697 info->drv_data->rtc_i2c_addr);
698 if (!info->rtc) {
699 dev_err(info->dev, "Failed to allocate I2C device for RTC\n");
700 return -ENODEV;
701 }
702
703 info->rtc_regmap = devm_regmap_init_i2c(info->rtc,
704 &max77686_rtc_regmap_config);
705 if (IS_ERR(info->rtc_regmap)) {
706 ret = PTR_ERR(info->rtc_regmap);
707 dev_err(info->dev, "Failed to allocate RTC regmap: %d\n", ret);
708 goto err_unregister_i2c;
709 }
710
711 add_rtc_irq:
712 ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq,
713 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
714 IRQF_SHARED, 0, info->drv_data->rtc_irq_chip,
715 &info->rtc_irq_data);
716 if (ret < 0) {
717 dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);
718 goto err_unregister_i2c;
719 }
720
721 return 0;
722
723 err_unregister_i2c:
724 if (info->rtc)
725 i2c_unregister_device(info->rtc);
726 return ret;
727 }
728
max77686_rtc_probe(struct platform_device * pdev)729 static int max77686_rtc_probe(struct platform_device *pdev)
730 {
731 struct max77686_rtc_info *info;
732 const struct platform_device_id *id = platform_get_device_id(pdev);
733 int ret;
734
735 info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
736 GFP_KERNEL);
737 if (!info)
738 return -ENOMEM;
739
740 mutex_init(&info->lock);
741 info->dev = &pdev->dev;
742 info->drv_data = (const struct max77686_rtc_driver_data *)
743 id->driver_data;
744
745 ret = max77686_init_rtc_regmap(info);
746 if (ret < 0)
747 return ret;
748
749 platform_set_drvdata(pdev, info);
750
751 ret = max77686_rtc_init_reg(info);
752 if (ret < 0) {
753 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
754 goto err_rtc;
755 }
756
757 device_init_wakeup(&pdev->dev, 1);
758
759 info->rtc_dev = devm_rtc_device_register(&pdev->dev, id->name,
760 &max77686_rtc_ops, THIS_MODULE);
761
762 if (IS_ERR(info->rtc_dev)) {
763 ret = PTR_ERR(info->rtc_dev);
764 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
765 if (ret == 0)
766 ret = -EINVAL;
767 goto err_rtc;
768 }
769
770 info->virq = regmap_irq_get_virq(info->rtc_irq_data,
771 MAX77686_RTCIRQ_RTCA1);
772 if (info->virq <= 0) {
773 ret = -ENXIO;
774 goto err_rtc;
775 }
776
777 ret = request_threaded_irq(info->virq, NULL, max77686_rtc_alarm_irq, 0,
778 "rtc-alarm1", info);
779 if (ret < 0) {
780 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
781 info->virq, ret);
782 goto err_rtc;
783 }
784
785 return 0;
786
787 err_rtc:
788 regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
789 if (info->rtc)
790 i2c_unregister_device(info->rtc);
791
792 return ret;
793 }
794
max77686_rtc_remove(struct platform_device * pdev)795 static int max77686_rtc_remove(struct platform_device *pdev)
796 {
797 struct max77686_rtc_info *info = platform_get_drvdata(pdev);
798
799 free_irq(info->virq, info);
800 regmap_del_irq_chip(info->rtc_irq, info->rtc_irq_data);
801 if (info->rtc)
802 i2c_unregister_device(info->rtc);
803
804 return 0;
805 }
806
807 #ifdef CONFIG_PM_SLEEP
max77686_rtc_suspend(struct device * dev)808 static int max77686_rtc_suspend(struct device *dev)
809 {
810 if (device_may_wakeup(dev)) {
811 struct max77686_rtc_info *info = dev_get_drvdata(dev);
812
813 return enable_irq_wake(info->virq);
814 }
815
816 return 0;
817 }
818
max77686_rtc_resume(struct device * dev)819 static int max77686_rtc_resume(struct device *dev)
820 {
821 if (device_may_wakeup(dev)) {
822 struct max77686_rtc_info *info = dev_get_drvdata(dev);
823
824 return disable_irq_wake(info->virq);
825 }
826
827 return 0;
828 }
829 #endif
830
831 static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
832 max77686_rtc_suspend, max77686_rtc_resume);
833
834 static const struct platform_device_id rtc_id[] = {
835 { "max77686-rtc", .driver_data = (kernel_ulong_t)&max77686_drv_data, },
836 { "max77802-rtc", .driver_data = (kernel_ulong_t)&max77802_drv_data, },
837 { "max77620-rtc", .driver_data = (kernel_ulong_t)&max77620_drv_data, },
838 {},
839 };
840 MODULE_DEVICE_TABLE(platform, rtc_id);
841
842 static struct platform_driver max77686_rtc_driver = {
843 .driver = {
844 .name = "max77686-rtc",
845 .pm = &max77686_rtc_pm_ops,
846 },
847 .probe = max77686_rtc_probe,
848 .remove = max77686_rtc_remove,
849 .id_table = rtc_id,
850 };
851
852 module_platform_driver(max77686_rtc_driver);
853
854 MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
855 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
856 MODULE_LICENSE("GPL");
857
