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1// SPDX-License-Identifier: GPL-2.0+
2//
3// RTC driver for Maxim MAX8997
4//
5// Copyright (C) 2013 Samsung Electronics Co.Ltd
6//
7// based on rtc-max8998.c
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/slab.h>
12#include <linux/rtc.h>
13#include <linux/delay.h>
14#include <linux/mutex.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/mfd/max8997-private.h>
18#include <linux/irqdomain.h>
19
20/* Module parameter for WTSR function control */
21static int wtsr_en = 1;
22module_param(wtsr_en, int, 0444);
23MODULE_PARM_DESC(wtsr_en, "Watchdog Timeout & Software Reset (default=on)");
24/* Module parameter for SMPL function control */
25static int smpl_en = 1;
26module_param(smpl_en, int, 0444);
27MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)");
28
29/* RTC Control Register */
30#define BCD_EN_SHIFT 0
31#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
32#define MODEL24_SHIFT 1
33#define MODEL24_MASK (1 << MODEL24_SHIFT)
34/* RTC Update Register1 */
35#define RTC_UDR_SHIFT 0
36#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
37/* WTSR and SMPL Register */
38#define WTSRT_SHIFT 0
39#define SMPLT_SHIFT 2
40#define WTSR_EN_SHIFT 6
41#define SMPL_EN_SHIFT 7
42#define WTSRT_MASK (3 << WTSRT_SHIFT)
43#define SMPLT_MASK (3 << SMPLT_SHIFT)
44#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT)
45#define SMPL_EN_MASK (1 << SMPL_EN_SHIFT)
46/* RTC Hour register */
47#define HOUR_PM_SHIFT 6
48#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
49/* RTC Alarm Enable */
50#define ALARM_ENABLE_SHIFT 7
51#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
52
53enum {
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
64struct max8997_rtc_info {
65 struct device *dev;
66 struct max8997_dev *max8997;
67 struct i2c_client *rtc;
68 struct rtc_device *rtc_dev;
69 struct mutex lock;
70 int virq;
71 int rtc_24hr_mode;
72};
73
74static void max8997_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
75 int rtc_24hr_mode)
76{
77 tm->tm_sec = data[RTC_SEC] & 0x7f;
78 tm->tm_min = data[RTC_MIN] & 0x7f;
79 if (rtc_24hr_mode)
80 tm->tm_hour = data[RTC_HOUR] & 0x1f;
81 else {
82 tm->tm_hour = data[RTC_HOUR] & 0x0f;
83 if (data[RTC_HOUR] & HOUR_PM_MASK)
84 tm->tm_hour += 12;
85 }
86
87 tm->tm_wday = fls(data[RTC_WEEKDAY] & 0x7f) - 1;
88 tm->tm_mday = data[RTC_DATE] & 0x1f;
89 tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
90 tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
91 tm->tm_yday = 0;
92 tm->tm_isdst = 0;
93}
94
95static int max8997_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
96{
97 data[RTC_SEC] = tm->tm_sec;
98 data[RTC_MIN] = tm->tm_min;
99 data[RTC_HOUR] = tm->tm_hour;
100 data[RTC_WEEKDAY] = 1 << tm->tm_wday;
101 data[RTC_DATE] = tm->tm_mday;
102 data[RTC_MONTH] = tm->tm_mon + 1;
103 data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
104
105 if (tm->tm_year < 100) {
106 pr_warn("RTC cannot handle the year %d. Assume it's 2000.\n",
107 1900 + tm->tm_year);
108 return -EINVAL;
109 }
110 return 0;
111}
112
113static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info)
114{
115 int ret;
116
117 ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1,
118 RTC_UDR_MASK);
119 if (ret < 0)
120 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
121 __func__, ret);
122 else {
123 /* Minimum 16ms delay required before RTC update.
124 * Otherwise, we may read and update based on out-of-date
125 * value */
126 msleep(20);
127 }
128
129 return ret;
130}
131
132static int max8997_rtc_read_time(struct device *dev, struct rtc_time *tm)
133{
134 struct max8997_rtc_info *info = dev_get_drvdata(dev);
135 u8 data[RTC_NR_TIME];
136 int ret;
137
138 mutex_lock(&info->lock);
139 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
140 mutex_unlock(&info->lock);
141
142 if (ret < 0) {
143 dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
144 ret);
145 return ret;
146 }
147
148 max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
149
150 return 0;
151}
152
153static int max8997_rtc_set_time(struct device *dev, struct rtc_time *tm)
154{
155 struct max8997_rtc_info *info = dev_get_drvdata(dev);
156 u8 data[RTC_NR_TIME];
157 int ret;
158
159 ret = max8997_rtc_tm_to_data(tm, data);
160 if (ret < 0)
161 return ret;
162
163 mutex_lock(&info->lock);
164
165 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
166 if (ret < 0) {
167 dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
168 ret);
169 goto out;
170 }
171
172 ret = max8997_rtc_set_update_reg(info);
173out:
174 mutex_unlock(&info->lock);
175 return ret;
176}
177
178static int max8997_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
179{
180 struct max8997_rtc_info *info = dev_get_drvdata(dev);
181 u8 data[RTC_NR_TIME];
182 u8 val;
183 int i, ret;
184
185 mutex_lock(&info->lock);
186
187 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
188 data);
189 if (ret < 0) {
190 dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
191 __func__, __LINE__, ret);
192 goto out;
193 }
194
195 max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
196
197 alrm->enabled = 0;
198 for (i = 0; i < RTC_NR_TIME; i++) {
199 if (data[i] & ALARM_ENABLE_MASK) {
200 alrm->enabled = 1;
201 break;
202 }
203 }
204
205 alrm->pending = 0;
206 ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val);
207 if (ret < 0) {
208 dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n",
209 __func__, __LINE__, ret);
210 goto out;
211 }
212
213 if (val & (1 << 4)) /* RTCA1 */
214 alrm->pending = 1;
215
216out:
217 mutex_unlock(&info->lock);
218 return ret;
219}
220
221static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info)
222{
223 u8 data[RTC_NR_TIME];
224 int ret, i;
225
226 if (!mutex_is_locked(&info->lock))
227 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
228
229 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
230 data);
231 if (ret < 0) {
232 dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
233 __func__, ret);
234 goto out;
235 }
236
237 for (i = 0; i < RTC_NR_TIME; i++)
238 data[i] &= ~ALARM_ENABLE_MASK;
239
240 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
241 data);
242 if (ret < 0) {
243 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
244 __func__, ret);
245 goto out;
246 }
247
248 ret = max8997_rtc_set_update_reg(info);
249out:
250 return ret;
251}
252
253static int max8997_rtc_start_alarm(struct max8997_rtc_info *info)
254{
255 u8 data[RTC_NR_TIME];
256 int ret;
257
258 if (!mutex_is_locked(&info->lock))
259 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
260
261 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
262 data);
263 if (ret < 0) {
264 dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
265 __func__, ret);
266 goto out;
267 }
268
269 data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
270 data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
271 data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
272 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
273 if (data[RTC_MONTH] & 0xf)
274 data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
275 if (data[RTC_YEAR] & 0x7f)
276 data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
277 if (data[RTC_DATE] & 0x1f)
278 data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
279
280 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
281 data);
282 if (ret < 0) {
283 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
284 __func__, ret);
285 goto out;
286 }
287
288 ret = max8997_rtc_set_update_reg(info);
289out:
290 return ret;
291}
292static int max8997_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
293{
294 struct max8997_rtc_info *info = dev_get_drvdata(dev);
295 u8 data[RTC_NR_TIME];
296 int ret;
297
298 ret = max8997_rtc_tm_to_data(&alrm->time, data);
299 if (ret < 0)
300 return ret;
301
302 dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__,
303 data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE],
304 data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]);
305
306 mutex_lock(&info->lock);
307
308 ret = max8997_rtc_stop_alarm(info);
309 if (ret < 0)
310 goto out;
311
312 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
313 data);
314 if (ret < 0) {
315 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
316 __func__, ret);
317 goto out;
318 }
319
320 ret = max8997_rtc_set_update_reg(info);
321 if (ret < 0)
322 goto out;
323
324 if (alrm->enabled)
325 ret = max8997_rtc_start_alarm(info);
326out:
327 mutex_unlock(&info->lock);
328 return ret;
329}
330
331static int max8997_rtc_alarm_irq_enable(struct device *dev,
332 unsigned int enabled)
333{
334 struct max8997_rtc_info *info = dev_get_drvdata(dev);
335 int ret;
336
337 mutex_lock(&info->lock);
338 if (enabled)
339 ret = max8997_rtc_start_alarm(info);
340 else
341 ret = max8997_rtc_stop_alarm(info);
342 mutex_unlock(&info->lock);
343
344 return ret;
345}
346
347static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data)
348{
349 struct max8997_rtc_info *info = data;
350
351 dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
352
353 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
354
355 return IRQ_HANDLED;
356}
357
358static const struct rtc_class_ops max8997_rtc_ops = {
359 .read_time = max8997_rtc_read_time,
360 .set_time = max8997_rtc_set_time,
361 .read_alarm = max8997_rtc_read_alarm,
362 .set_alarm = max8997_rtc_set_alarm,
363 .alarm_irq_enable = max8997_rtc_alarm_irq_enable,
364};
365
366static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable)
367{
368 int ret;
369 u8 val, mask;
370
371 if (!wtsr_en)
372 return;
373
374 if (enable)
375 val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT);
376 else
377 val = 0;
378
379 mask = WTSR_EN_MASK | WTSRT_MASK;
380
381 dev_info(info->dev, "%s: %s WTSR\n", __func__,
382 enable ? "enable" : "disable");
383
384 ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
385 if (ret < 0) {
386 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
387 __func__, ret);
388 return;
389 }
390
391 max8997_rtc_set_update_reg(info);
392}
393
394static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable)
395{
396 int ret;
397 u8 val, mask;
398
399 if (!smpl_en)
400 return;
401
402 if (enable)
403 val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT);
404 else
405 val = 0;
406
407 mask = SMPL_EN_MASK | SMPLT_MASK;
408
409 dev_info(info->dev, "%s: %s SMPL\n", __func__,
410 enable ? "enable" : "disable");
411
412 ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
413 if (ret < 0) {
414 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
415 __func__, ret);
416 return;
417 }
418
419 max8997_rtc_set_update_reg(info);
420
421 val = 0;
422 max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val);
423 pr_info("WTSR_SMPL(0x%02x)\n", val);
424}
425
426static int max8997_rtc_init_reg(struct max8997_rtc_info *info)
427{
428 u8 data[2];
429 int ret;
430
431 /* Set RTC control register : Binary mode, 24hour mdoe */
432 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
433 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
434
435 info->rtc_24hr_mode = 1;
436
437 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data);
438 if (ret < 0) {
439 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
440 __func__, ret);
441 return ret;
442 }
443
444 ret = max8997_rtc_set_update_reg(info);
445 return ret;
446}
447
448static int max8997_rtc_probe(struct platform_device *pdev)
449{
450 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
451 struct max8997_rtc_info *info;
452 int ret, virq;
453
454 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info),
455 GFP_KERNEL);
456 if (!info)
457 return -ENOMEM;
458
459 mutex_init(&info->lock);
460 info->dev = &pdev->dev;
461 info->max8997 = max8997;
462 info->rtc = max8997->rtc;
463
464 platform_set_drvdata(pdev, info);
465
466 ret = max8997_rtc_init_reg(info);
467
468 if (ret < 0) {
469 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
470 return ret;
471 }
472
473 max8997_rtc_enable_wtsr(info, true);
474 max8997_rtc_enable_smpl(info, true);
475
476 device_init_wakeup(&pdev->dev, 1);
477
478 info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8997-rtc",
479 &max8997_rtc_ops, THIS_MODULE);
480
481 if (IS_ERR(info->rtc_dev)) {
482 ret = PTR_ERR(info->rtc_dev);
483 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
484 return ret;
485 }
486
487 virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1);
488 if (!virq) {
489 dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n");
490 ret = -ENXIO;
491 goto err_out;
492 }
493 info->virq = virq;
494
495 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
496 max8997_rtc_alarm_irq, 0,
497 "rtc-alarm0", info);
498 if (ret < 0)
499 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
500 info->virq, ret);
501
502err_out:
503 return ret;
504}
505
506static void max8997_rtc_shutdown(struct platform_device *pdev)
507{
508 struct max8997_rtc_info *info = platform_get_drvdata(pdev);
509
510 max8997_rtc_enable_wtsr(info, false);
511 max8997_rtc_enable_smpl(info, false);
512}
513
514static const struct platform_device_id rtc_id[] = {
515 { "max8997-rtc", 0 },
516 {},
517};
518MODULE_DEVICE_TABLE(platform, rtc_id);
519
520static struct platform_driver max8997_rtc_driver = {
521 .driver = {
522 .name = "max8997-rtc",
523 },
524 .probe = max8997_rtc_probe,
525 .shutdown = max8997_rtc_shutdown,
526 .id_table = rtc_id,
527};
528
529module_platform_driver(max8997_rtc_driver);
530
531MODULE_DESCRIPTION("Maxim MAX8997 RTC driver");
532MODULE_AUTHOR("<ms925.kim@samsung.com>");
533MODULE_LICENSE("GPL");
1/*
2 * RTC driver for Maxim MAX8997
3 *
4 * Copyright (C) 2013 Samsung Electronics Co.Ltd
5 *
6 * based on rtc-max8998.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/slab.h>
16#include <linux/rtc.h>
17#include <linux/delay.h>
18#include <linux/mutex.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/mfd/max8997-private.h>
22#include <linux/irqdomain.h>
23
24/* Module parameter for WTSR function control */
25static int wtsr_en = 1;
26module_param(wtsr_en, int, 0444);
27MODULE_PARM_DESC(wtsr_en, "Watchdog Timeout & Software Reset (default=on)");
28/* Module parameter for SMPL function control */
29static int smpl_en = 1;
30module_param(smpl_en, int, 0444);
31MODULE_PARM_DESC(smpl_en, "Sudden Momentary Power Loss (default=on)");
32
33/* RTC Control Register */
34#define BCD_EN_SHIFT 0
35#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
36#define MODEL24_SHIFT 1
37#define MODEL24_MASK (1 << MODEL24_SHIFT)
38/* RTC Update Register1 */
39#define RTC_UDR_SHIFT 0
40#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
41/* WTSR and SMPL Register */
42#define WTSRT_SHIFT 0
43#define SMPLT_SHIFT 2
44#define WTSR_EN_SHIFT 6
45#define SMPL_EN_SHIFT 7
46#define WTSRT_MASK (3 << WTSRT_SHIFT)
47#define SMPLT_MASK (3 << SMPLT_SHIFT)
48#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT)
49#define SMPL_EN_MASK (1 << SMPL_EN_SHIFT)
50/* RTC Hour register */
51#define HOUR_PM_SHIFT 6
52#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
53/* RTC Alarm Enable */
54#define ALARM_ENABLE_SHIFT 7
55#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
56
57enum {
58 RTC_SEC = 0,
59 RTC_MIN,
60 RTC_HOUR,
61 RTC_WEEKDAY,
62 RTC_MONTH,
63 RTC_YEAR,
64 RTC_DATE,
65 RTC_NR_TIME
66};
67
68struct max8997_rtc_info {
69 struct device *dev;
70 struct max8997_dev *max8997;
71 struct i2c_client *rtc;
72 struct rtc_device *rtc_dev;
73 struct mutex lock;
74 int virq;
75 int rtc_24hr_mode;
76};
77
78static void max8997_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
79 int rtc_24hr_mode)
80{
81 tm->tm_sec = data[RTC_SEC] & 0x7f;
82 tm->tm_min = data[RTC_MIN] & 0x7f;
83 if (rtc_24hr_mode)
84 tm->tm_hour = data[RTC_HOUR] & 0x1f;
85 else {
86 tm->tm_hour = data[RTC_HOUR] & 0x0f;
87 if (data[RTC_HOUR] & HOUR_PM_MASK)
88 tm->tm_hour += 12;
89 }
90
91 tm->tm_wday = fls(data[RTC_WEEKDAY] & 0x7f) - 1;
92 tm->tm_mday = data[RTC_DATE] & 0x1f;
93 tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
94 tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
95 tm->tm_yday = 0;
96 tm->tm_isdst = 0;
97}
98
99static int max8997_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
100{
101 data[RTC_SEC] = tm->tm_sec;
102 data[RTC_MIN] = tm->tm_min;
103 data[RTC_HOUR] = tm->tm_hour;
104 data[RTC_WEEKDAY] = 1 << tm->tm_wday;
105 data[RTC_DATE] = tm->tm_mday;
106 data[RTC_MONTH] = tm->tm_mon + 1;
107 data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
108
109 if (tm->tm_year < 100) {
110 pr_warn("%s: MAX8997 RTC cannot handle the year %d."
111 "Assume it's 2000.\n", __func__, 1900 + tm->tm_year);
112 return -EINVAL;
113 }
114 return 0;
115}
116
117static inline int max8997_rtc_set_update_reg(struct max8997_rtc_info *info)
118{
119 int ret;
120
121 ret = max8997_write_reg(info->rtc, MAX8997_RTC_UPDATE1,
122 RTC_UDR_MASK);
123 if (ret < 0)
124 dev_err(info->dev, "%s: fail to write update reg(%d)\n",
125 __func__, ret);
126 else {
127 /* Minimum 16ms delay required before RTC update.
128 * Otherwise, we may read and update based on out-of-date
129 * value */
130 msleep(20);
131 }
132
133 return ret;
134}
135
136static int max8997_rtc_read_time(struct device *dev, struct rtc_time *tm)
137{
138 struct max8997_rtc_info *info = dev_get_drvdata(dev);
139 u8 data[RTC_NR_TIME];
140 int ret;
141
142 mutex_lock(&info->lock);
143 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
144 mutex_unlock(&info->lock);
145
146 if (ret < 0) {
147 dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__,
148 ret);
149 return ret;
150 }
151
152 max8997_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
153
154 return rtc_valid_tm(tm);
155}
156
157static int max8997_rtc_set_time(struct device *dev, struct rtc_time *tm)
158{
159 struct max8997_rtc_info *info = dev_get_drvdata(dev);
160 u8 data[RTC_NR_TIME];
161 int ret;
162
163 ret = max8997_rtc_tm_to_data(tm, data);
164 if (ret < 0)
165 return ret;
166
167 mutex_lock(&info->lock);
168
169 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_SEC, RTC_NR_TIME, data);
170 if (ret < 0) {
171 dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
172 ret);
173 goto out;
174 }
175
176 ret = max8997_rtc_set_update_reg(info);
177out:
178 mutex_unlock(&info->lock);
179 return ret;
180}
181
182static int max8997_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
183{
184 struct max8997_rtc_info *info = dev_get_drvdata(dev);
185 u8 data[RTC_NR_TIME];
186 u8 val;
187 int i, ret;
188
189 mutex_lock(&info->lock);
190
191 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
192 data);
193 if (ret < 0) {
194 dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
195 __func__, __LINE__, ret);
196 goto out;
197 }
198
199 max8997_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
200
201 alrm->enabled = 0;
202 for (i = 0; i < RTC_NR_TIME; i++) {
203 if (data[i] & ALARM_ENABLE_MASK) {
204 alrm->enabled = 1;
205 break;
206 }
207 }
208
209 alrm->pending = 0;
210 ret = max8997_read_reg(info->max8997->i2c, MAX8997_REG_STATUS1, &val);
211 if (ret < 0) {
212 dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n",
213 __func__, __LINE__, ret);
214 goto out;
215 }
216
217 if (val & (1 << 4)) /* RTCA1 */
218 alrm->pending = 1;
219
220out:
221 mutex_unlock(&info->lock);
222 return 0;
223}
224
225static int max8997_rtc_stop_alarm(struct max8997_rtc_info *info)
226{
227 u8 data[RTC_NR_TIME];
228 int ret, i;
229
230 if (!mutex_is_locked(&info->lock))
231 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
232
233 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
234 data);
235 if (ret < 0) {
236 dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
237 __func__, ret);
238 goto out;
239 }
240
241 for (i = 0; i < RTC_NR_TIME; i++)
242 data[i] &= ~ALARM_ENABLE_MASK;
243
244 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
245 data);
246 if (ret < 0) {
247 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
248 __func__, ret);
249 goto out;
250 }
251
252 ret = max8997_rtc_set_update_reg(info);
253out:
254 return ret;
255}
256
257static int max8997_rtc_start_alarm(struct max8997_rtc_info *info)
258{
259 u8 data[RTC_NR_TIME];
260 int ret;
261
262 if (!mutex_is_locked(&info->lock))
263 dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
264
265 ret = max8997_bulk_read(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
266 data);
267 if (ret < 0) {
268 dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
269 __func__, ret);
270 goto out;
271 }
272
273 data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
274 data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
275 data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
276 data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
277 if (data[RTC_MONTH] & 0xf)
278 data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
279 if (data[RTC_YEAR] & 0x7f)
280 data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
281 if (data[RTC_DATE] & 0x1f)
282 data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
283
284 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
285 data);
286 if (ret < 0) {
287 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
288 __func__, ret);
289 goto out;
290 }
291
292 ret = max8997_rtc_set_update_reg(info);
293out:
294 return ret;
295}
296static int max8997_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
297{
298 struct max8997_rtc_info *info = dev_get_drvdata(dev);
299 u8 data[RTC_NR_TIME];
300 int ret;
301
302 ret = max8997_rtc_tm_to_data(&alrm->time, data);
303 if (ret < 0)
304 return ret;
305
306 dev_info(info->dev, "%s: %d-%02d-%02d %02d:%02d:%02d\n", __func__,
307 data[RTC_YEAR] + 2000, data[RTC_MONTH], data[RTC_DATE],
308 data[RTC_HOUR], data[RTC_MIN], data[RTC_SEC]);
309
310 mutex_lock(&info->lock);
311
312 ret = max8997_rtc_stop_alarm(info);
313 if (ret < 0)
314 goto out;
315
316 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_ALARM1_SEC, RTC_NR_TIME,
317 data);
318 if (ret < 0) {
319 dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
320 __func__, ret);
321 goto out;
322 }
323
324 ret = max8997_rtc_set_update_reg(info);
325 if (ret < 0)
326 goto out;
327
328 if (alrm->enabled)
329 ret = max8997_rtc_start_alarm(info);
330out:
331 mutex_unlock(&info->lock);
332 return ret;
333}
334
335static int max8997_rtc_alarm_irq_enable(struct device *dev,
336 unsigned int enabled)
337{
338 struct max8997_rtc_info *info = dev_get_drvdata(dev);
339 int ret;
340
341 mutex_lock(&info->lock);
342 if (enabled)
343 ret = max8997_rtc_start_alarm(info);
344 else
345 ret = max8997_rtc_stop_alarm(info);
346 mutex_unlock(&info->lock);
347
348 return ret;
349}
350
351static irqreturn_t max8997_rtc_alarm_irq(int irq, void *data)
352{
353 struct max8997_rtc_info *info = data;
354
355 dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
356
357 rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
358
359 return IRQ_HANDLED;
360}
361
362static const struct rtc_class_ops max8997_rtc_ops = {
363 .read_time = max8997_rtc_read_time,
364 .set_time = max8997_rtc_set_time,
365 .read_alarm = max8997_rtc_read_alarm,
366 .set_alarm = max8997_rtc_set_alarm,
367 .alarm_irq_enable = max8997_rtc_alarm_irq_enable,
368};
369
370static void max8997_rtc_enable_wtsr(struct max8997_rtc_info *info, bool enable)
371{
372 int ret;
373 u8 val, mask;
374
375 if (!wtsr_en)
376 return;
377
378 if (enable)
379 val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT);
380 else
381 val = 0;
382
383 mask = WTSR_EN_MASK | WTSRT_MASK;
384
385 dev_info(info->dev, "%s: %s WTSR\n", __func__,
386 enable ? "enable" : "disable");
387
388 ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
389 if (ret < 0) {
390 dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
391 __func__, ret);
392 return;
393 }
394
395 max8997_rtc_set_update_reg(info);
396}
397
398static void max8997_rtc_enable_smpl(struct max8997_rtc_info *info, bool enable)
399{
400 int ret;
401 u8 val, mask;
402
403 if (!smpl_en)
404 return;
405
406 if (enable)
407 val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT);
408 else
409 val = 0;
410
411 mask = SMPL_EN_MASK | SMPLT_MASK;
412
413 dev_info(info->dev, "%s: %s SMPL\n", __func__,
414 enable ? "enable" : "disable");
415
416 ret = max8997_update_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, val, mask);
417 if (ret < 0) {
418 dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
419 __func__, ret);
420 return;
421 }
422
423 max8997_rtc_set_update_reg(info);
424
425 val = 0;
426 max8997_read_reg(info->rtc, MAX8997_RTC_WTSR_SMPL, &val);
427 pr_info("%s: WTSR_SMPL(0x%02x)\n", __func__, val);
428}
429
430static int max8997_rtc_init_reg(struct max8997_rtc_info *info)
431{
432 u8 data[2];
433 int ret;
434
435 /* Set RTC control register : Binary mode, 24hour mdoe */
436 data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
437 data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
438
439 info->rtc_24hr_mode = 1;
440
441 ret = max8997_bulk_write(info->rtc, MAX8997_RTC_CTRLMASK, 2, data);
442 if (ret < 0) {
443 dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
444 __func__, ret);
445 return ret;
446 }
447
448 ret = max8997_rtc_set_update_reg(info);
449 return ret;
450}
451
452static int max8997_rtc_probe(struct platform_device *pdev)
453{
454 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
455 struct max8997_rtc_info *info;
456 int ret, virq;
457
458 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_rtc_info),
459 GFP_KERNEL);
460 if (!info)
461 return -ENOMEM;
462
463 mutex_init(&info->lock);
464 info->dev = &pdev->dev;
465 info->max8997 = max8997;
466 info->rtc = max8997->rtc;
467
468 platform_set_drvdata(pdev, info);
469
470 ret = max8997_rtc_init_reg(info);
471
472 if (ret < 0) {
473 dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
474 return ret;
475 }
476
477 max8997_rtc_enable_wtsr(info, true);
478 max8997_rtc_enable_smpl(info, true);
479
480 device_init_wakeup(&pdev->dev, 1);
481
482 info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8997-rtc",
483 &max8997_rtc_ops, THIS_MODULE);
484
485 if (IS_ERR(info->rtc_dev)) {
486 ret = PTR_ERR(info->rtc_dev);
487 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
488 return ret;
489 }
490
491 virq = irq_create_mapping(max8997->irq_domain, MAX8997_PMICIRQ_RTCA1);
492 if (!virq) {
493 dev_err(&pdev->dev, "Failed to create mapping alarm IRQ\n");
494 ret = -ENXIO;
495 goto err_out;
496 }
497 info->virq = virq;
498
499 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
500 max8997_rtc_alarm_irq, 0,
501 "rtc-alarm0", info);
502 if (ret < 0)
503 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
504 info->virq, ret);
505
506err_out:
507 return ret;
508}
509
510static void max8997_rtc_shutdown(struct platform_device *pdev)
511{
512 struct max8997_rtc_info *info = platform_get_drvdata(pdev);
513
514 max8997_rtc_enable_wtsr(info, false);
515 max8997_rtc_enable_smpl(info, false);
516}
517
518static const struct platform_device_id rtc_id[] = {
519 { "max8997-rtc", 0 },
520 {},
521};
522
523static struct platform_driver max8997_rtc_driver = {
524 .driver = {
525 .name = "max8997-rtc",
526 .owner = THIS_MODULE,
527 },
528 .probe = max8997_rtc_probe,
529 .shutdown = max8997_rtc_shutdown,
530 .id_table = rtc_id,
531};
532
533module_platform_driver(max8997_rtc_driver);
534
535MODULE_DESCRIPTION("Maxim MAX8997 RTC driver");
536MODULE_AUTHOR("<ms925.kim@samsung.com>");
537MODULE_LICENSE("GPL");