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1 | /* |
2 | * RTC driver for Maxim MAX77686 |
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/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/max77686-private.h> |
22 | #include <linux/irqdomain.h> |
23 | #include <linux/regmap.h> |
24 | |
25 | /* RTC Control Register */ |
26 | #define BCD_EN_SHIFT 0 |
27 | #define BCD_EN_MASK (1 << BCD_EN_SHIFT) |
28 | #define MODEL24_SHIFT 1 |
29 | #define MODEL24_MASK (1 << MODEL24_SHIFT) |
30 | /* RTC Update Register1 */ |
31 | #define RTC_UDR_SHIFT 0 |
32 | #define RTC_UDR_MASK (1 << RTC_UDR_SHIFT) |
33 | #define RTC_RBUDR_SHIFT 4 |
34 | #define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT) |
35 | /* WTSR and SMPL Register */ |
36 | #define WTSRT_SHIFT 0 |
37 | #define SMPLT_SHIFT 2 |
38 | #define WTSR_EN_SHIFT 6 |
39 | #define SMPL_EN_SHIFT 7 |
40 | #define WTSRT_MASK (3 << WTSRT_SHIFT) |
41 | #define SMPLT_MASK (3 << SMPLT_SHIFT) |
42 | #define WTSR_EN_MASK (1 << WTSR_EN_SHIFT) |
43 | #define SMPL_EN_MASK (1 << SMPL_EN_SHIFT) |
44 | /* RTC Hour register */ |
45 | #define HOUR_PM_SHIFT 6 |
46 | #define HOUR_PM_MASK (1 << HOUR_PM_SHIFT) |
47 | /* RTC Alarm Enable */ |
48 | #define ALARM_ENABLE_SHIFT 7 |
49 | #define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT) |
50 | |
51 | #define MAX77686_RTC_UPDATE_DELAY 16 |
52 | #undef MAX77686_RTC_WTSR_SMPL |
53 | |
54 | enum { |
55 | RTC_SEC = 0, |
56 | RTC_MIN, |
57 | RTC_HOUR, |
58 | RTC_WEEKDAY, |
59 | RTC_MONTH, |
60 | RTC_YEAR, |
61 | RTC_DATE, |
62 | RTC_NR_TIME |
63 | }; |
64 | |
65 | struct max77686_rtc_info { |
66 | struct device *dev; |
67 | struct max77686_dev *max77686; |
68 | struct i2c_client *rtc; |
69 | struct rtc_device *rtc_dev; |
70 | struct mutex lock; |
71 | |
72 | struct regmap *regmap; |
73 | |
74 | int virq; |
75 | int rtc_24hr_mode; |
76 | }; |
77 | |
78 | enum MAX77686_RTC_OP { |
79 | MAX77686_RTC_WRITE, |
80 | MAX77686_RTC_READ, |
81 | }; |
82 | |
83 | static inline int max77686_rtc_calculate_wday(u8 shifted) |
84 | { |
85 | int counter = -1; |
86 | while (shifted) { |
87 | shifted >>= 1; |
88 | counter++; |
89 | } |
90 | return counter; |
91 | } |
92 | |
93 | static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm, |
94 | int rtc_24hr_mode) |
95 | { |
96 | tm->tm_sec = data[RTC_SEC] & 0x7f; |
97 | tm->tm_min = data[RTC_MIN] & 0x7f; |
98 | if (rtc_24hr_mode) |
99 | tm->tm_hour = data[RTC_HOUR] & 0x1f; |
100 | else { |
101 | tm->tm_hour = data[RTC_HOUR] & 0x0f; |
102 | if (data[RTC_HOUR] & HOUR_PM_MASK) |
103 | tm->tm_hour += 12; |
104 | } |
105 | |
106 | tm->tm_wday = max77686_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f); |
107 | tm->tm_mday = data[RTC_DATE] & 0x1f; |
108 | tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1; |
109 | tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100; |
110 | tm->tm_yday = 0; |
111 | tm->tm_isdst = 0; |
112 | } |
113 | |
114 | static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data) |
115 | { |
116 | data[RTC_SEC] = tm->tm_sec; |
117 | data[RTC_MIN] = tm->tm_min; |
118 | data[RTC_HOUR] = tm->tm_hour; |
119 | data[RTC_WEEKDAY] = 1 << tm->tm_wday; |
120 | data[RTC_DATE] = tm->tm_mday; |
121 | data[RTC_MONTH] = tm->tm_mon + 1; |
122 | data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0 ; |
123 | |
124 | if (tm->tm_year < 100) { |
125 | pr_warn("%s: MAX77686 RTC cannot handle the year %d." |
126 | "Assume it's 2000.\n", __func__, 1900 + tm->tm_year); |
127 | return -EINVAL; |
128 | } |
129 | return 0; |
130 | } |
131 | |
132 | static int max77686_rtc_update(struct max77686_rtc_info *info, |
133 | enum MAX77686_RTC_OP op) |
134 | { |
135 | int ret; |
136 | unsigned int data; |
137 | |
138 | if (op == MAX77686_RTC_WRITE) |
139 | data = 1 << RTC_UDR_SHIFT; |
140 | else |
141 | data = 1 << RTC_RBUDR_SHIFT; |
142 | |
143 | ret = regmap_update_bits(info->max77686->rtc_regmap, |
144 | MAX77686_RTC_UPDATE0, data, data); |
145 | if (ret < 0) |
146 | dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n", |
147 | __func__, ret, data); |
148 | else { |
149 | /* Minimum 16ms delay required before RTC update. */ |
150 | msleep(MAX77686_RTC_UPDATE_DELAY); |
151 | } |
152 | |
153 | return ret; |
154 | } |
155 | |
156 | static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm) |
157 | { |
158 | struct max77686_rtc_info *info = dev_get_drvdata(dev); |
159 | u8 data[RTC_NR_TIME]; |
160 | int ret; |
161 | |
162 | mutex_lock(&info->lock); |
163 | |
164 | ret = max77686_rtc_update(info, MAX77686_RTC_READ); |
165 | if (ret < 0) |
166 | goto out; |
167 | |
168 | ret = regmap_bulk_read(info->max77686->rtc_regmap, |
169 | MAX77686_RTC_SEC, data, RTC_NR_TIME); |
170 | if (ret < 0) { |
171 | dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, ret); |
172 | goto out; |
173 | } |
174 | |
175 | max77686_rtc_data_to_tm(data, tm, info->rtc_24hr_mode); |
176 | |
177 | ret = rtc_valid_tm(tm); |
178 | |
179 | out: |
180 | mutex_unlock(&info->lock); |
181 | return ret; |
182 | } |
183 | |
184 | static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm) |
185 | { |
186 | struct max77686_rtc_info *info = dev_get_drvdata(dev); |
187 | u8 data[RTC_NR_TIME]; |
188 | int ret; |
189 | |
190 | ret = max77686_rtc_tm_to_data(tm, data); |
191 | if (ret < 0) |
192 | return ret; |
193 | |
194 | mutex_lock(&info->lock); |
195 | |
196 | ret = regmap_bulk_write(info->max77686->rtc_regmap, |
197 | MAX77686_RTC_SEC, data, RTC_NR_TIME); |
198 | if (ret < 0) { |
199 | dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__, |
200 | ret); |
201 | goto out; |
202 | } |
203 | |
204 | ret = max77686_rtc_update(info, MAX77686_RTC_WRITE); |
205 | |
206 | out: |
207 | mutex_unlock(&info->lock); |
208 | return ret; |
209 | } |
210 | |
211 | static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
212 | { |
213 | struct max77686_rtc_info *info = dev_get_drvdata(dev); |
214 | u8 data[RTC_NR_TIME]; |
215 | unsigned int val; |
216 | int i, ret; |
217 | |
218 | mutex_lock(&info->lock); |
219 | |
220 | ret = max77686_rtc_update(info, MAX77686_RTC_READ); |
221 | if (ret < 0) |
222 | goto out; |
223 | |
224 | ret = regmap_bulk_read(info->max77686->rtc_regmap, |
225 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
226 | if (ret < 0) { |
227 | dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n", |
228 | __func__, __LINE__, ret); |
229 | goto out; |
230 | } |
231 | |
232 | max77686_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode); |
233 | |
234 | alrm->enabled = 0; |
235 | for (i = 0; i < RTC_NR_TIME; i++) { |
236 | if (data[i] & ALARM_ENABLE_MASK) { |
237 | alrm->enabled = 1; |
238 | break; |
239 | } |
240 | } |
241 | |
242 | alrm->pending = 0; |
243 | ret = regmap_read(info->max77686->regmap, MAX77686_REG_STATUS1, &val); |
244 | if (ret < 0) { |
245 | dev_err(info->dev, "%s:%d fail to read status1 reg(%d)\n", |
246 | __func__, __LINE__, ret); |
247 | goto out; |
248 | } |
249 | |
250 | if (val & (1 << 4)) /* RTCA1 */ |
251 | alrm->pending = 1; |
252 | |
253 | out: |
254 | mutex_unlock(&info->lock); |
255 | return 0; |
256 | } |
257 | |
258 | static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info) |
259 | { |
260 | u8 data[RTC_NR_TIME]; |
261 | int ret, i; |
262 | struct rtc_time tm; |
263 | |
264 | if (!mutex_is_locked(&info->lock)) |
265 | dev_warn(info->dev, "%s: should have mutex locked\n", __func__); |
266 | |
267 | ret = max77686_rtc_update(info, MAX77686_RTC_READ); |
268 | if (ret < 0) |
269 | goto out; |
270 | |
271 | ret = regmap_bulk_read(info->max77686->rtc_regmap, |
272 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
273 | if (ret < 0) { |
274 | dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", |
275 | __func__, ret); |
276 | goto out; |
277 | } |
278 | |
279 | max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode); |
280 | |
281 | for (i = 0; i < RTC_NR_TIME; i++) |
282 | data[i] &= ~ALARM_ENABLE_MASK; |
283 | |
284 | ret = regmap_bulk_write(info->max77686->rtc_regmap, |
285 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
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 = max77686_rtc_update(info, MAX77686_RTC_WRITE); |
293 | out: |
294 | return ret; |
295 | } |
296 | |
297 | static int max77686_rtc_start_alarm(struct max77686_rtc_info *info) |
298 | { |
299 | u8 data[RTC_NR_TIME]; |
300 | int ret; |
301 | struct rtc_time tm; |
302 | |
303 | if (!mutex_is_locked(&info->lock)) |
304 | dev_warn(info->dev, "%s: should have mutex locked\n", __func__); |
305 | |
306 | ret = max77686_rtc_update(info, MAX77686_RTC_READ); |
307 | if (ret < 0) |
308 | goto out; |
309 | |
310 | ret = regmap_bulk_read(info->max77686->rtc_regmap, |
311 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
312 | if (ret < 0) { |
313 | dev_err(info->dev, "%s: fail to read alarm reg(%d)\n", |
314 | __func__, ret); |
315 | goto out; |
316 | } |
317 | |
318 | max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode); |
319 | |
320 | data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT); |
321 | data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT); |
322 | data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT); |
323 | data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK; |
324 | if (data[RTC_MONTH] & 0xf) |
325 | data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT); |
326 | if (data[RTC_YEAR] & 0x7f) |
327 | data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT); |
328 | if (data[RTC_DATE] & 0x1f) |
329 | data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT); |
330 | |
331 | ret = regmap_bulk_write(info->max77686->rtc_regmap, |
332 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
333 | if (ret < 0) { |
334 | dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", |
335 | __func__, ret); |
336 | goto out; |
337 | } |
338 | |
339 | ret = max77686_rtc_update(info, MAX77686_RTC_WRITE); |
340 | out: |
341 | return ret; |
342 | } |
343 | |
344 | static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
345 | { |
346 | struct max77686_rtc_info *info = dev_get_drvdata(dev); |
347 | u8 data[RTC_NR_TIME]; |
348 | int ret; |
349 | |
350 | ret = max77686_rtc_tm_to_data(&alrm->time, data); |
351 | if (ret < 0) |
352 | return ret; |
353 | |
354 | mutex_lock(&info->lock); |
355 | |
356 | ret = max77686_rtc_stop_alarm(info); |
357 | if (ret < 0) |
358 | goto out; |
359 | |
360 | ret = regmap_bulk_write(info->max77686->rtc_regmap, |
361 | MAX77686_ALARM1_SEC, data, RTC_NR_TIME); |
362 | |
363 | if (ret < 0) { |
364 | dev_err(info->dev, "%s: fail to write alarm reg(%d)\n", |
365 | __func__, ret); |
366 | goto out; |
367 | } |
368 | |
369 | ret = max77686_rtc_update(info, MAX77686_RTC_WRITE); |
370 | if (ret < 0) |
371 | goto out; |
372 | |
373 | if (alrm->enabled) |
374 | ret = max77686_rtc_start_alarm(info); |
375 | out: |
376 | mutex_unlock(&info->lock); |
377 | return ret; |
378 | } |
379 | |
380 | static int max77686_rtc_alarm_irq_enable(struct device *dev, |
381 | unsigned int enabled) |
382 | { |
383 | struct max77686_rtc_info *info = dev_get_drvdata(dev); |
384 | int ret; |
385 | |
386 | mutex_lock(&info->lock); |
387 | if (enabled) |
388 | ret = max77686_rtc_start_alarm(info); |
389 | else |
390 | ret = max77686_rtc_stop_alarm(info); |
391 | mutex_unlock(&info->lock); |
392 | |
393 | return ret; |
394 | } |
395 | |
396 | static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data) |
397 | { |
398 | struct max77686_rtc_info *info = data; |
399 | |
400 | dev_info(info->dev, "%s:irq(%d)\n", __func__, irq); |
401 | |
402 | rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); |
403 | |
404 | return IRQ_HANDLED; |
405 | } |
406 | |
407 | static const struct rtc_class_ops max77686_rtc_ops = { |
408 | .read_time = max77686_rtc_read_time, |
409 | .set_time = max77686_rtc_set_time, |
410 | .read_alarm = max77686_rtc_read_alarm, |
411 | .set_alarm = max77686_rtc_set_alarm, |
412 | .alarm_irq_enable = max77686_rtc_alarm_irq_enable, |
413 | }; |
414 | |
415 | #ifdef MAX77686_RTC_WTSR_SMPL |
416 | static void max77686_rtc_enable_wtsr(struct max77686_rtc_info *info, bool enable) |
417 | { |
418 | int ret; |
419 | unsigned int val, mask; |
420 | |
421 | if (enable) |
422 | val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT); |
423 | else |
424 | val = 0; |
425 | |
426 | mask = WTSR_EN_MASK | WTSRT_MASK; |
427 | |
428 | dev_info(info->dev, "%s: %s WTSR\n", __func__, |
429 | enable ? "enable" : "disable"); |
430 | |
431 | ret = regmap_update_bits(info->max77686->rtc_regmap, |
432 | MAX77686_WTSR_SMPL_CNTL, mask, val); |
433 | if (ret < 0) { |
434 | dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n", |
435 | __func__, ret); |
436 | return; |
437 | } |
438 | |
439 | max77686_rtc_update(info, MAX77686_RTC_WRITE); |
440 | } |
441 | |
442 | static void max77686_rtc_enable_smpl(struct max77686_rtc_info *info, bool enable) |
443 | { |
444 | int ret; |
445 | unsigned int val, mask; |
446 | |
447 | if (enable) |
448 | val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT); |
449 | else |
450 | val = 0; |
451 | |
452 | mask = SMPL_EN_MASK | SMPLT_MASK; |
453 | |
454 | dev_info(info->dev, "%s: %s SMPL\n", __func__, |
455 | enable ? "enable" : "disable"); |
456 | |
457 | ret = regmap_update_bits(info->max77686->rtc_regmap, |
458 | MAX77686_WTSR_SMPL_CNTL, mask, val); |
459 | if (ret < 0) { |
460 | dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n", |
461 | __func__, ret); |
462 | return; |
463 | } |
464 | |
465 | max77686_rtc_update(info, MAX77686_RTC_WRITE); |
466 | |
467 | val = 0; |
468 | regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val); |
469 | pr_info("%s: WTSR_SMPL(0x%02x)\n", __func__, val); |
470 | } |
471 | #endif /* MAX77686_RTC_WTSR_SMPL */ |
472 | |
473 | static int max77686_rtc_init_reg(struct max77686_rtc_info *info) |
474 | { |
475 | u8 data[2]; |
476 | int ret; |
477 | |
478 | /* Set RTC control register : Binary mode, 24hour mdoe */ |
479 | data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); |
480 | data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT); |
481 | |
482 | info->rtc_24hr_mode = 1; |
483 | |
484 | ret = regmap_bulk_write(info->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2); |
485 | if (ret < 0) { |
486 | dev_err(info->dev, "%s: fail to write controlm reg(%d)\n", |
487 | __func__, ret); |
488 | return ret; |
489 | } |
490 | |
491 | ret = max77686_rtc_update(info, MAX77686_RTC_WRITE); |
492 | return ret; |
493 | } |
494 | |
495 | static struct regmap_config max77686_rtc_regmap_config = { |
496 | .reg_bits = 8, |
497 | .val_bits = 8, |
498 | }; |
499 | |
500 | static int max77686_rtc_probe(struct platform_device *pdev) |
501 | { |
502 | struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent); |
503 | struct max77686_rtc_info *info; |
504 | int ret, virq; |
505 | |
506 | dev_info(&pdev->dev, "%s\n", __func__); |
507 | |
508 | info = kzalloc(sizeof(struct max77686_rtc_info), GFP_KERNEL); |
509 | if (!info) |
510 | return -ENOMEM; |
511 | |
512 | mutex_init(&info->lock); |
513 | info->dev = &pdev->dev; |
514 | info->max77686 = max77686; |
515 | info->rtc = max77686->rtc; |
516 | info->max77686->rtc_regmap = regmap_init_i2c(info->max77686->rtc, |
517 | &max77686_rtc_regmap_config); |
518 | if (IS_ERR(info->max77686->rtc_regmap)) { |
519 | ret = PTR_ERR(info->max77686->rtc_regmap); |
520 | dev_err(info->max77686->dev, "Failed to allocate register map: %d\n", |
521 | ret); |
522 | kfree(info); |
523 | return ret; |
524 | } |
525 | platform_set_drvdata(pdev, info); |
526 | |
527 | ret = max77686_rtc_init_reg(info); |
528 | |
529 | if (ret < 0) { |
530 | dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret); |
531 | goto err_rtc; |
532 | } |
533 | |
534 | #ifdef MAX77686_RTC_WTSR_SMPL |
535 | max77686_rtc_enable_wtsr(info, true); |
536 | max77686_rtc_enable_smpl(info, true); |
537 | #endif |
538 | |
539 | device_init_wakeup(&pdev->dev, 1); |
540 | |
541 | info->rtc_dev = rtc_device_register("max77686-rtc", &pdev->dev, |
542 | &max77686_rtc_ops, THIS_MODULE); |
543 | |
544 | if (IS_ERR(info->rtc_dev)) { |
545 | dev_info(&pdev->dev, "%s: fail\n", __func__); |
546 | |
547 | ret = PTR_ERR(info->rtc_dev); |
548 | dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); |
549 | if (ret == 0) |
550 | ret = -EINVAL; |
551 | goto err_rtc; |
552 | } |
553 | virq = irq_create_mapping(max77686->irq_domain, MAX77686_RTCIRQ_RTCA1); |
554 | if (!virq) |
555 | goto err_rtc; |
556 | info->virq = virq; |
557 | |
558 | ret = request_threaded_irq(virq, NULL, max77686_rtc_alarm_irq, 0, |
559 | "rtc-alarm0", info); |
560 | if (ret < 0) { |
561 | dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", |
562 | info->virq, ret); |
563 | goto err_rtc; |
564 | } |
565 | |
566 | goto out; |
567 | err_rtc: |
568 | kfree(info); |
569 | return ret; |
570 | out: |
571 | return ret; |
572 | } |
573 | |
574 | static int max77686_rtc_remove(struct platform_device *pdev) |
575 | { |
576 | struct max77686_rtc_info *info = platform_get_drvdata(pdev); |
577 | |
578 | if (info) { |
579 | free_irq(info->virq, info); |
580 | rtc_device_unregister(info->rtc_dev); |
581 | kfree(info); |
582 | } |
583 | |
584 | return 0; |
585 | } |
586 | |
587 | static void max77686_rtc_shutdown(struct platform_device *pdev) |
588 | { |
589 | #ifdef MAX77686_RTC_WTSR_SMPL |
590 | struct max77686_rtc_info *info = platform_get_drvdata(pdev); |
591 | int i; |
592 | u8 val = 0; |
593 | |
594 | for (i = 0; i < 3; i++) { |
595 | max77686_rtc_enable_wtsr(info, false); |
596 | regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val); |
597 | pr_info("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val); |
598 | if (val & WTSR_EN_MASK) |
599 | pr_emerg("%s: fail to disable WTSR\n", __func__); |
600 | else { |
601 | pr_info("%s: success to disable WTSR\n", __func__); |
602 | break; |
603 | } |
604 | } |
605 | |
606 | /* Disable SMPL when power off */ |
607 | max77686_rtc_enable_smpl(info, false); |
608 | #endif /* MAX77686_RTC_WTSR_SMPL */ |
609 | } |
610 | |
611 | static const struct platform_device_id rtc_id[] = { |
612 | { "max77686-rtc", 0 }, |
613 | {}, |
614 | }; |
615 | |
616 | static struct platform_driver max77686_rtc_driver = { |
617 | .driver = { |
618 | .name = "max77686-rtc", |
619 | .owner = THIS_MODULE, |
620 | }, |
621 | .probe = max77686_rtc_probe, |
622 | .remove = max77686_rtc_remove, |
623 | .shutdown = max77686_rtc_shutdown, |
624 | .id_table = rtc_id, |
625 | }; |
626 | |
627 | static int __init max77686_rtc_init(void) |
628 | { |
629 | return platform_driver_register(&max77686_rtc_driver); |
630 | } |
631 | module_init(max77686_rtc_init); |
632 | |
633 | static void __exit max77686_rtc_exit(void) |
634 | { |
635 | platform_driver_unregister(&max77686_rtc_driver); |
636 | } |
637 | module_exit(max77686_rtc_exit); |
638 | |
639 | MODULE_DESCRIPTION("Maxim MAX77686 RTC driver"); |
640 | MODULE_AUTHOR("<woong.byun@samsung.com>"); |
641 | MODULE_LICENSE("GPL"); |
642 |
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v2.6.34-rc5
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