1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * RTC driver for the Micro Crystal RV8803
4 *
5 * Copyright (C) 2015 Micro Crystal SA
6 * Alexandre Belloni <alexandre.belloni@bootlin.com>
7 *
8 */
9
10 #include <linux/bcd.h>
11 #include <linux/bitops.h>
12 #include <linux/bitfield.h>
13 #include <linux/log2.h>
14 #include <linux/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/of_device.h>
19 #include <linux/rtc.h>
20
21 #define RV8803_I2C_TRY_COUNT 4
22
23 #define RV8803_SEC 0x00
24 #define RV8803_MIN 0x01
25 #define RV8803_HOUR 0x02
26 #define RV8803_WEEK 0x03
27 #define RV8803_DAY 0x04
28 #define RV8803_MONTH 0x05
29 #define RV8803_YEAR 0x06
30 #define RV8803_RAM 0x07
31 #define RV8803_ALARM_MIN 0x08
32 #define RV8803_ALARM_HOUR 0x09
33 #define RV8803_ALARM_WEEK_OR_DAY 0x0A
34 #define RV8803_EXT 0x0D
35 #define RV8803_FLAG 0x0E
36 #define RV8803_CTRL 0x0F
37 #define RV8803_OSC_OFFSET 0x2C
38
39 #define RV8803_EXT_WADA BIT(6)
40
41 #define RV8803_FLAG_V1F BIT(0)
42 #define RV8803_FLAG_V2F BIT(1)
43 #define RV8803_FLAG_AF BIT(3)
44 #define RV8803_FLAG_TF BIT(4)
45 #define RV8803_FLAG_UF BIT(5)
46
47 #define RV8803_CTRL_RESET BIT(0)
48
49 #define RV8803_CTRL_EIE BIT(2)
50 #define RV8803_CTRL_AIE BIT(3)
51 #define RV8803_CTRL_TIE BIT(4)
52 #define RV8803_CTRL_UIE BIT(5)
53
54 #define RX8803_CTRL_CSEL GENMASK(7, 6)
55
56 #define RX8900_BACKUP_CTRL 0x18
57 #define RX8900_FLAG_SWOFF BIT(2)
58 #define RX8900_FLAG_VDETOFF BIT(3)
59
60 enum rv8803_type {
61 rv_8803,
62 rx_8803,
63 rx_8804,
64 rx_8900
65 };
66
67 struct rv8803_data {
68 struct i2c_client *client;
69 struct rtc_device *rtc;
70 struct mutex flags_lock;
71 u8 ctrl;
72 u8 backup;
73 enum rv8803_type type;
74 };
75
rv8803_read_reg(const struct i2c_client * client,u8 reg)76 static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
77 {
78 int try = RV8803_I2C_TRY_COUNT;
79 s32 ret;
80
81 /*
82 * There is a 61µs window during which the RTC does not acknowledge I2C
83 * transfers. In that case, ensure that there are multiple attempts.
84 */
85 do
86 ret = i2c_smbus_read_byte_data(client, reg);
87 while ((ret == -ENXIO || ret == -EIO) && --try);
88 if (ret < 0)
89 dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
90
91 return ret;
92 }
93
rv8803_read_regs(const struct i2c_client * client,u8 reg,u8 count,u8 * values)94 static int rv8803_read_regs(const struct i2c_client *client,
95 u8 reg, u8 count, u8 *values)
96 {
97 int try = RV8803_I2C_TRY_COUNT;
98 s32 ret;
99
100 do
101 ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
102 while ((ret == -ENXIO || ret == -EIO) && --try);
103 if (ret != count) {
104 dev_err(&client->dev,
105 "Unable to read registers 0x%02x..0x%02x\n",
106 reg, reg + count - 1);
107 return ret < 0 ? ret : -EIO;
108 }
109
110 return 0;
111 }
112
rv8803_write_reg(const struct i2c_client * client,u8 reg,u8 value)113 static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
114 {
115 int try = RV8803_I2C_TRY_COUNT;
116 s32 ret;
117
118 do
119 ret = i2c_smbus_write_byte_data(client, reg, value);
120 while ((ret == -ENXIO || ret == -EIO) && --try);
121 if (ret)
122 dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
123
124 return ret;
125 }
126
rv8803_write_regs(const struct i2c_client * client,u8 reg,u8 count,const u8 * values)127 static int rv8803_write_regs(const struct i2c_client *client,
128 u8 reg, u8 count, const u8 *values)
129 {
130 int try = RV8803_I2C_TRY_COUNT;
131 s32 ret;
132
133 do
134 ret = i2c_smbus_write_i2c_block_data(client, reg, count,
135 values);
136 while ((ret == -ENXIO || ret == -EIO) && --try);
137 if (ret)
138 dev_err(&client->dev,
139 "Unable to write registers 0x%02x..0x%02x\n",
140 reg, reg + count - 1);
141
142 return ret;
143 }
144
rv8803_regs_init(struct rv8803_data * rv8803)145 static int rv8803_regs_init(struct rv8803_data *rv8803)
146 {
147 int ret;
148
149 ret = rv8803_write_reg(rv8803->client, RV8803_OSC_OFFSET, 0x00);
150 if (ret)
151 return ret;
152
153 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
154 FIELD_PREP(RX8803_CTRL_CSEL, 1)); /* 2s */
155 if (ret)
156 return ret;
157
158 ret = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3,
159 (u8[]){ 0, 0, 0 });
160 if (ret)
161 return ret;
162
163 return rv8803_write_reg(rv8803->client, RV8803_RAM, 0x00);
164 }
165
166 static int rv8803_regs_configure(struct rv8803_data *rv8803);
167
rv8803_regs_reset(struct rv8803_data * rv8803)168 static int rv8803_regs_reset(struct rv8803_data *rv8803)
169 {
170 /*
171 * The RV-8803 resets all registers to POR defaults after voltage-loss,
172 * the Epson RTCs don't, so we manually reset the remainder here.
173 */
174 if (rv8803->type == rx_8803 || rv8803->type == rx_8900) {
175 int ret = rv8803_regs_init(rv8803);
176 if (ret)
177 return ret;
178 }
179
180 return rv8803_regs_configure(rv8803);
181 }
182
rv8803_handle_irq(int irq,void * dev_id)183 static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
184 {
185 struct i2c_client *client = dev_id;
186 struct rv8803_data *rv8803 = i2c_get_clientdata(client);
187 unsigned long events = 0;
188 int flags;
189
190 mutex_lock(&rv8803->flags_lock);
191
192 flags = rv8803_read_reg(client, RV8803_FLAG);
193 if (flags <= 0) {
194 mutex_unlock(&rv8803->flags_lock);
195 return IRQ_NONE;
196 }
197
198 if (flags & RV8803_FLAG_V1F)
199 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
200
201 if (flags & RV8803_FLAG_V2F)
202 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
203
204 if (flags & RV8803_FLAG_TF) {
205 flags &= ~RV8803_FLAG_TF;
206 rv8803->ctrl &= ~RV8803_CTRL_TIE;
207 events |= RTC_PF;
208 }
209
210 if (flags & RV8803_FLAG_AF) {
211 flags &= ~RV8803_FLAG_AF;
212 rv8803->ctrl &= ~RV8803_CTRL_AIE;
213 events |= RTC_AF;
214 }
215
216 if (flags & RV8803_FLAG_UF) {
217 flags &= ~RV8803_FLAG_UF;
218 rv8803->ctrl &= ~RV8803_CTRL_UIE;
219 events |= RTC_UF;
220 }
221
222 if (events) {
223 rtc_update_irq(rv8803->rtc, 1, events);
224 rv8803_write_reg(client, RV8803_FLAG, flags);
225 rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
226 }
227
228 mutex_unlock(&rv8803->flags_lock);
229
230 return IRQ_HANDLED;
231 }
232
rv8803_get_time(struct device * dev,struct rtc_time * tm)233 static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
234 {
235 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
236 u8 date1[7];
237 u8 date2[7];
238 u8 *date = date1;
239 int ret, flags;
240
241 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
242 if (flags < 0)
243 return flags;
244
245 if (flags & RV8803_FLAG_V2F) {
246 dev_warn(dev, "Voltage low, data is invalid.\n");
247 return -EINVAL;
248 }
249
250 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
251 if (ret)
252 return ret;
253
254 if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
255 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
256 if (ret)
257 return ret;
258
259 if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
260 date = date2;
261 }
262
263 tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f);
264 tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f);
265 tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
266 tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
267 tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
268 tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
269 tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
270
271 return 0;
272 }
273
rv8803_set_time(struct device * dev,struct rtc_time * tm)274 static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
275 {
276 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
277 u8 date[7];
278 int ctrl, flags, ret;
279
280 ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
281 if (ctrl < 0)
282 return ctrl;
283
284 /* Stop the clock */
285 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
286 ctrl | RV8803_CTRL_RESET);
287 if (ret)
288 return ret;
289
290 date[RV8803_SEC] = bin2bcd(tm->tm_sec);
291 date[RV8803_MIN] = bin2bcd(tm->tm_min);
292 date[RV8803_HOUR] = bin2bcd(tm->tm_hour);
293 date[RV8803_WEEK] = 1 << (tm->tm_wday);
294 date[RV8803_DAY] = bin2bcd(tm->tm_mday);
295 date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
296 date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100);
297
298 ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
299 if (ret)
300 return ret;
301
302 /* Restart the clock */
303 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
304 ctrl & ~RV8803_CTRL_RESET);
305 if (ret)
306 return ret;
307
308 mutex_lock(&rv8803->flags_lock);
309
310 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
311 if (flags < 0) {
312 mutex_unlock(&rv8803->flags_lock);
313 return flags;
314 }
315
316 if (flags & RV8803_FLAG_V2F) {
317 ret = rv8803_regs_reset(rv8803);
318 if (ret) {
319 mutex_unlock(&rv8803->flags_lock);
320 return ret;
321 }
322 }
323
324 ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
325 flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
326
327 mutex_unlock(&rv8803->flags_lock);
328
329 return ret;
330 }
331
rv8803_get_alarm(struct device * dev,struct rtc_wkalrm * alrm)332 static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
333 {
334 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
335 struct i2c_client *client = rv8803->client;
336 u8 alarmvals[3];
337 int flags, ret;
338
339 ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
340 if (ret)
341 return ret;
342
343 flags = rv8803_read_reg(client, RV8803_FLAG);
344 if (flags < 0)
345 return flags;
346
347 alrm->time.tm_sec = 0;
348 alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
349 alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
350 alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
351
352 alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
353 alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
354
355 return 0;
356 }
357
rv8803_set_alarm(struct device * dev,struct rtc_wkalrm * alrm)358 static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
359 {
360 struct i2c_client *client = to_i2c_client(dev);
361 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
362 u8 alarmvals[3];
363 u8 ctrl[2];
364 int ret, err;
365
366 /* The alarm has no seconds, round up to nearest minute */
367 if (alrm->time.tm_sec) {
368 time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
369
370 alarm_time += 60 - alrm->time.tm_sec;
371 rtc_time64_to_tm(alarm_time, &alrm->time);
372 }
373
374 mutex_lock(&rv8803->flags_lock);
375
376 ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
377 if (ret) {
378 mutex_unlock(&rv8803->flags_lock);
379 return ret;
380 }
381
382 alarmvals[0] = bin2bcd(alrm->time.tm_min);
383 alarmvals[1] = bin2bcd(alrm->time.tm_hour);
384 alarmvals[2] = bin2bcd(alrm->time.tm_mday);
385
386 if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
387 rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
388 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
389 rv8803->ctrl);
390 if (err) {
391 mutex_unlock(&rv8803->flags_lock);
392 return err;
393 }
394 }
395
396 ctrl[0] &= ~RV8803_FLAG_AF;
397 err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[0]);
398 mutex_unlock(&rv8803->flags_lock);
399 if (err)
400 return err;
401
402 err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
403 if (err)
404 return err;
405
406 if (alrm->enabled) {
407 if (rv8803->rtc->uie_rtctimer.enabled)
408 rv8803->ctrl |= RV8803_CTRL_UIE;
409 if (rv8803->rtc->aie_timer.enabled)
410 rv8803->ctrl |= RV8803_CTRL_AIE;
411
412 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
413 rv8803->ctrl);
414 if (err)
415 return err;
416 }
417
418 return 0;
419 }
420
rv8803_alarm_irq_enable(struct device * dev,unsigned int enabled)421 static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
422 {
423 struct i2c_client *client = to_i2c_client(dev);
424 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
425 int ctrl, flags, err;
426
427 ctrl = rv8803->ctrl;
428
429 if (enabled) {
430 if (rv8803->rtc->uie_rtctimer.enabled)
431 ctrl |= RV8803_CTRL_UIE;
432 if (rv8803->rtc->aie_timer.enabled)
433 ctrl |= RV8803_CTRL_AIE;
434 } else {
435 if (!rv8803->rtc->uie_rtctimer.enabled)
436 ctrl &= ~RV8803_CTRL_UIE;
437 if (!rv8803->rtc->aie_timer.enabled)
438 ctrl &= ~RV8803_CTRL_AIE;
439 }
440
441 mutex_lock(&rv8803->flags_lock);
442 flags = rv8803_read_reg(client, RV8803_FLAG);
443 if (flags < 0) {
444 mutex_unlock(&rv8803->flags_lock);
445 return flags;
446 }
447 flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
448 err = rv8803_write_reg(client, RV8803_FLAG, flags);
449 mutex_unlock(&rv8803->flags_lock);
450 if (err)
451 return err;
452
453 if (ctrl != rv8803->ctrl) {
454 rv8803->ctrl = ctrl;
455 err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
456 if (err)
457 return err;
458 }
459
460 return 0;
461 }
462
rv8803_ioctl(struct device * dev,unsigned int cmd,unsigned long arg)463 static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
464 {
465 struct i2c_client *client = to_i2c_client(dev);
466 struct rv8803_data *rv8803 = dev_get_drvdata(dev);
467 unsigned int vl = 0;
468 int flags, ret = 0;
469
470 switch (cmd) {
471 case RTC_VL_READ:
472 flags = rv8803_read_reg(client, RV8803_FLAG);
473 if (flags < 0)
474 return flags;
475
476 if (flags & RV8803_FLAG_V1F) {
477 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
478 vl = RTC_VL_ACCURACY_LOW;
479 }
480
481 if (flags & RV8803_FLAG_V2F)
482 vl |= RTC_VL_DATA_INVALID;
483
484 return put_user(vl, (unsigned int __user *)arg);
485
486 case RTC_VL_CLR:
487 mutex_lock(&rv8803->flags_lock);
488 flags = rv8803_read_reg(client, RV8803_FLAG);
489 if (flags < 0) {
490 mutex_unlock(&rv8803->flags_lock);
491 return flags;
492 }
493
494 flags &= ~RV8803_FLAG_V1F;
495 ret = rv8803_write_reg(client, RV8803_FLAG, flags);
496 mutex_unlock(&rv8803->flags_lock);
497 if (ret)
498 return ret;
499
500 return 0;
501
502 default:
503 return -ENOIOCTLCMD;
504 }
505 }
506
rv8803_nvram_write(void * priv,unsigned int offset,void * val,size_t bytes)507 static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
508 size_t bytes)
509 {
510 return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
511 }
512
rv8803_nvram_read(void * priv,unsigned int offset,void * val,size_t bytes)513 static int rv8803_nvram_read(void *priv, unsigned int offset,
514 void *val, size_t bytes)
515 {
516 int ret;
517
518 ret = rv8803_read_reg(priv, RV8803_RAM);
519 if (ret < 0)
520 return ret;
521
522 *(u8 *)val = ret;
523
524 return 0;
525 }
526
527 static const struct rtc_class_ops rv8803_rtc_ops = {
528 .read_time = rv8803_get_time,
529 .set_time = rv8803_set_time,
530 .ioctl = rv8803_ioctl,
531 .read_alarm = rv8803_get_alarm,
532 .set_alarm = rv8803_set_alarm,
533 .alarm_irq_enable = rv8803_alarm_irq_enable,
534 };
535
rx8900_trickle_charger_init(struct rv8803_data * rv8803)536 static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
537 {
538 struct i2c_client *client = rv8803->client;
539 struct device_node *node = client->dev.of_node;
540 int err;
541 u8 flags;
542
543 if (!node)
544 return 0;
545
546 if (rv8803->type != rx_8900)
547 return 0;
548
549 err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
550 if (err < 0)
551 return err;
552
553 flags = (u8)err;
554 flags &= ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF);
555 flags |= rv8803->backup;
556
557 return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
558 flags);
559 }
560
561 /* configure registers with values different than the Power-On reset defaults */
rv8803_regs_configure(struct rv8803_data * rv8803)562 static int rv8803_regs_configure(struct rv8803_data *rv8803)
563 {
564 int err;
565
566 err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
567 if (err)
568 return err;
569
570 err = rx8900_trickle_charger_init(rv8803);
571 if (err) {
572 dev_err(&rv8803->client->dev, "failed to init charger\n");
573 return err;
574 }
575
576 return 0;
577 }
578
rv8803_probe(struct i2c_client * client,const struct i2c_device_id * id)579 static int rv8803_probe(struct i2c_client *client,
580 const struct i2c_device_id *id)
581 {
582 struct i2c_adapter *adapter = client->adapter;
583 struct rv8803_data *rv8803;
584 int err, flags;
585 struct nvmem_config nvmem_cfg = {
586 .name = "rv8803_nvram",
587 .word_size = 1,
588 .stride = 1,
589 .size = 1,
590 .reg_read = rv8803_nvram_read,
591 .reg_write = rv8803_nvram_write,
592 .priv = client,
593 };
594
595 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
596 I2C_FUNC_SMBUS_I2C_BLOCK)) {
597 dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
598 return -EIO;
599 }
600
601 rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
602 GFP_KERNEL);
603 if (!rv8803)
604 return -ENOMEM;
605
606 mutex_init(&rv8803->flags_lock);
607 rv8803->client = client;
608 if (client->dev.of_node)
609 rv8803->type = (enum rv8803_type)
610 of_device_get_match_data(&client->dev);
611 else
612 rv8803->type = id->driver_data;
613 i2c_set_clientdata(client, rv8803);
614
615 flags = rv8803_read_reg(client, RV8803_FLAG);
616 if (flags < 0)
617 return flags;
618
619 if (flags & RV8803_FLAG_V1F)
620 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
621
622 if (flags & RV8803_FLAG_V2F)
623 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
624
625 if (flags & RV8803_FLAG_AF)
626 dev_warn(&client->dev, "An alarm maybe have been missed.\n");
627
628 rv8803->rtc = devm_rtc_allocate_device(&client->dev);
629 if (IS_ERR(rv8803->rtc))
630 return PTR_ERR(rv8803->rtc);
631
632 if (client->irq > 0) {
633 err = devm_request_threaded_irq(&client->dev, client->irq,
634 NULL, rv8803_handle_irq,
635 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
636 "rv8803", client);
637 if (err) {
638 dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
639 client->irq = 0;
640 }
641 }
642 if (!client->irq)
643 clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);
644
645 if (of_property_read_bool(client->dev.of_node, "epson,vdet-disable"))
646 rv8803->backup |= RX8900_FLAG_VDETOFF;
647
648 if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))
649 rv8803->backup |= RX8900_FLAG_SWOFF;
650
651 err = rv8803_regs_configure(rv8803);
652 if (err)
653 return err;
654
655 rv8803->rtc->ops = &rv8803_rtc_ops;
656 rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
657 rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;
658 err = devm_rtc_register_device(rv8803->rtc);
659 if (err)
660 return err;
661
662 devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);
663
664 rv8803->rtc->max_user_freq = 1;
665
666 return 0;
667 }
668
669 static const struct i2c_device_id rv8803_id[] = {
670 { "rv8803", rv_8803 },
671 { "rv8804", rx_8804 },
672 { "rx8803", rx_8803 },
673 { "rx8900", rx_8900 },
674 { }
675 };
676 MODULE_DEVICE_TABLE(i2c, rv8803_id);
677
678 static const __maybe_unused struct of_device_id rv8803_of_match[] = {
679 {
680 .compatible = "microcrystal,rv8803",
681 .data = (void *)rv_8803
682 },
683 {
684 .compatible = "epson,rx8803",
685 .data = (void *)rx_8803
686 },
687 {
688 .compatible = "epson,rx8804",
689 .data = (void *)rx_8804
690 },
691 {
692 .compatible = "epson,rx8900",
693 .data = (void *)rx_8900
694 },
695 { }
696 };
697 MODULE_DEVICE_TABLE(of, rv8803_of_match);
698
699 static struct i2c_driver rv8803_driver = {
700 .driver = {
701 .name = "rtc-rv8803",
702 .of_match_table = of_match_ptr(rv8803_of_match),
703 },
704 .probe = rv8803_probe,
705 .id_table = rv8803_id,
706 };
707 module_i2c_driver(rv8803_driver);
708
709 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
710 MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
711 MODULE_LICENSE("GPL v2");
712
