tjh.dev
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Micro Crystal RV-3029 / RV-3049 rtc class driver
4 *
5 * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
6 * Michael Buesch <m@bues.ch>
7 *
8 * based on previously existing rtc class drivers
9 */
10
11#include <linux/module.h>
12#include <linux/i2c.h>
13#include <linux/spi/spi.h>
14#include <linux/bcd.h>
15#include <linux/rtc.h>
16#include <linux/delay.h>
17#include <linux/of.h>
18#include <linux/hwmon.h>
19#include <linux/hwmon-sysfs.h>
20#include <linux/regmap.h>
21
22/* Register map */
23/* control section */
24#define RV3029_ONOFF_CTRL 0x00
25#define RV3029_ONOFF_CTRL_WE BIT(0)
26#define RV3029_ONOFF_CTRL_TE BIT(1)
27#define RV3029_ONOFF_CTRL_TAR BIT(2)
28#define RV3029_ONOFF_CTRL_EERE BIT(3)
29#define RV3029_ONOFF_CTRL_SRON BIT(4)
30#define RV3029_ONOFF_CTRL_TD0 BIT(5)
31#define RV3029_ONOFF_CTRL_TD1 BIT(6)
32#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
33#define RV3029_IRQ_CTRL 0x01
34#define RV3029_IRQ_CTRL_AIE BIT(0)
35#define RV3029_IRQ_CTRL_TIE BIT(1)
36#define RV3029_IRQ_CTRL_V1IE BIT(2)
37#define RV3029_IRQ_CTRL_V2IE BIT(3)
38#define RV3029_IRQ_CTRL_SRIE BIT(4)
39#define RV3029_IRQ_FLAGS 0x02
40#define RV3029_IRQ_FLAGS_AF BIT(0)
41#define RV3029_IRQ_FLAGS_TF BIT(1)
42#define RV3029_IRQ_FLAGS_V1IF BIT(2)
43#define RV3029_IRQ_FLAGS_V2IF BIT(3)
44#define RV3029_IRQ_FLAGS_SRF BIT(4)
45#define RV3029_STATUS 0x03
46#define RV3029_STATUS_VLOW1 BIT(2)
47#define RV3029_STATUS_VLOW2 BIT(3)
48#define RV3029_STATUS_SR BIT(4)
49#define RV3029_STATUS_PON BIT(5)
50#define RV3029_STATUS_EEBUSY BIT(7)
51#define RV3029_RST_CTRL 0x04
52#define RV3029_RST_CTRL_SYSR BIT(4)
53#define RV3029_CONTROL_SECTION_LEN 0x05
54
55/* watch section */
56#define RV3029_W_SEC 0x08
57#define RV3029_W_MINUTES 0x09
58#define RV3029_W_HOURS 0x0A
59#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
60#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
61#define RV3029_W_DATE 0x0B
62#define RV3029_W_DAYS 0x0C
63#define RV3029_W_MONTHS 0x0D
64#define RV3029_W_YEARS 0x0E
65#define RV3029_WATCH_SECTION_LEN 0x07
66
67/* alarm section */
68#define RV3029_A_SC 0x10
69#define RV3029_A_MN 0x11
70#define RV3029_A_HR 0x12
71#define RV3029_A_DT 0x13
72#define RV3029_A_DW 0x14
73#define RV3029_A_MO 0x15
74#define RV3029_A_YR 0x16
75#define RV3029_A_AE_X BIT(7)
76#define RV3029_ALARM_SECTION_LEN 0x07
77
78/* timer section */
79#define RV3029_TIMER_LOW 0x18
80#define RV3029_TIMER_HIGH 0x19
81
82/* temperature section */
83#define RV3029_TEMP_PAGE 0x20
84
85/* eeprom data section */
86#define RV3029_E2P_EEDATA1 0x28
87#define RV3029_E2P_EEDATA2 0x29
88#define RV3029_E2PDATA_SECTION_LEN 0x02
89
90/* eeprom control section */
91#define RV3029_CONTROL_E2P_EECTRL 0x30
92#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */
93#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */
94#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */
95#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */
96#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
97#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
98#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
99#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
100#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
101 RV3029_TRICKLE_5K |\
102 RV3029_TRICKLE_20K |\
103 RV3029_TRICKLE_80K)
104#define RV3029_TRICKLE_SHIFT 4
105#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */
106#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */
107#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */
108#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */
109#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */
110
111/* user ram section */
112#define RV3029_RAM_PAGE 0x38
113#define RV3029_RAM_SECTION_LEN 8
114
115struct rv3029_data {
116 struct device *dev;
117 struct rtc_device *rtc;
118 struct regmap *regmap;
119 int irq;
120};
121
122static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
123{
124 unsigned int sr;
125 int i, ret;
126
127 for (i = 100; i > 0; i--) {
128 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
129 if (ret < 0)
130 break;
131 if (!(sr & RV3029_STATUS_EEBUSY))
132 break;
133 usleep_range(1000, 10000);
134 }
135 if (i <= 0) {
136 dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
137 return -ETIMEDOUT;
138 }
139
140 return ret;
141}
142
143static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
144{
145 /* Re-enable eeprom refresh */
146 return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
147 RV3029_ONOFF_CTRL_EERE,
148 RV3029_ONOFF_CTRL_EERE);
149}
150
151static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
152{
153 unsigned int sr;
154 int ret;
155
156 /* Check whether we are in the allowed voltage range. */
157 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
158 if (ret < 0)
159 return ret;
160 if (sr & RV3029_STATUS_VLOW2)
161 return -ENODEV;
162 if (sr & RV3029_STATUS_VLOW1) {
163 /* We clear the bits and retry once just in case
164 * we had a brown out in early startup.
165 */
166 ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
167 RV3029_STATUS_VLOW1, 0);
168 if (ret < 0)
169 return ret;
170 usleep_range(1000, 10000);
171 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
172 if (ret < 0)
173 return ret;
174 if (sr & RV3029_STATUS_VLOW1) {
175 dev_err(rv3029->dev,
176 "Supply voltage is too low to safely access the EEPROM.\n");
177 return -ENODEV;
178 }
179 }
180
181 /* Disable eeprom refresh. */
182 ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
183 RV3029_ONOFF_CTRL_EERE, 0);
184 if (ret < 0)
185 return ret;
186
187 /* Wait for any previous eeprom accesses to finish. */
188 ret = rv3029_eeprom_busywait(rv3029);
189 if (ret < 0)
190 rv3029_eeprom_exit(rv3029);
191
192 return ret;
193}
194
195static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,
196 u8 buf[], size_t len)
197{
198 int ret, err;
199
200 err = rv3029_eeprom_enter(rv3029);
201 if (err < 0)
202 return err;
203
204 ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);
205
206 err = rv3029_eeprom_exit(rv3029);
207 if (err < 0)
208 return err;
209
210 return ret;
211}
212
213static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,
214 u8 const buf[], size_t len)
215{
216 unsigned int tmp;
217 int ret, err;
218 size_t i;
219
220 err = rv3029_eeprom_enter(rv3029);
221 if (err < 0)
222 return err;
223
224 for (i = 0; i < len; i++, reg++) {
225 ret = regmap_read(rv3029->regmap, reg, &tmp);
226 if (ret < 0)
227 break;
228 if (tmp != buf[i]) {
229 tmp = buf[i];
230 ret = regmap_write(rv3029->regmap, reg, tmp);
231 if (ret < 0)
232 break;
233 }
234 ret = rv3029_eeprom_busywait(rv3029);
235 if (ret < 0)
236 break;
237 }
238
239 err = rv3029_eeprom_exit(rv3029);
240 if (err < 0)
241 return err;
242
243 return ret;
244}
245
246static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,
247 u8 reg, u8 mask, u8 set)
248{
249 u8 buf;
250 int ret;
251
252 ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);
253 if (ret < 0)
254 return ret;
255 buf &= ~mask;
256 buf |= set & mask;
257 ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);
258 if (ret < 0)
259 return ret;
260
261 return 0;
262}
263
264static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
265{
266 struct device *dev = dev_id;
267 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
268 unsigned int flags, controls;
269 unsigned long events = 0;
270 int ret;
271
272 rtc_lock(rv3029->rtc);
273
274 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
275 if (ret) {
276 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
277 rtc_unlock(rv3029->rtc);
278 return IRQ_NONE;
279 }
280
281 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
282 if (ret) {
283 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
284 rtc_unlock(rv3029->rtc);
285 return IRQ_NONE;
286 }
287
288 if (flags & RV3029_IRQ_FLAGS_AF) {
289 flags &= ~RV3029_IRQ_FLAGS_AF;
290 controls &= ~RV3029_IRQ_CTRL_AIE;
291 events |= RTC_AF;
292 }
293
294 if (events) {
295 rtc_update_irq(rv3029->rtc, 1, events);
296 regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
297 regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
298 }
299 rtc_unlock(rv3029->rtc);
300
301 return IRQ_HANDLED;
302}
303
304static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
305{
306 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
307 unsigned int sr;
308 int ret;
309 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
310
311 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
312 if (ret < 0)
313 return ret;
314
315 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
316 return -EINVAL;
317
318 ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
319 RV3029_WATCH_SECTION_LEN);
320 if (ret < 0)
321 return ret;
322
323 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
324 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
325
326 /* HR field has a more complex interpretation */
327 {
328 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
329
330 if (_hr & RV3029_REG_HR_12_24) {
331 /* 12h format */
332 tm->tm_hour = bcd2bin(_hr & 0x1f);
333 if (_hr & RV3029_REG_HR_PM) /* PM flag set */
334 tm->tm_hour += 12;
335 } else /* 24h format */
336 tm->tm_hour = bcd2bin(_hr & 0x3f);
337 }
338
339 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
340 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
341 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
342 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
343
344 return 0;
345}
346
347static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
348{
349 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
350 struct rtc_time *const tm = &alarm->time;
351 unsigned int controls, flags;
352 int ret;
353 u8 regs[8];
354
355 ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
356 RV3029_ALARM_SECTION_LEN);
357 if (ret < 0)
358 return ret;
359
360 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
361 if (ret)
362 return ret;
363
364 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
365 if (ret < 0)
366 return ret;
367
368 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
369 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
370 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
371 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
372 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
373 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
374 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
375
376 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
377 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
378
379 return 0;
380}
381
382static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
383{
384 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
385
386 return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,
387 RV3029_IRQ_CTRL_AIE,
388 enable ? RV3029_IRQ_CTRL_AIE : 0);
389}
390
391static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
392{
393 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
394 struct rtc_time *const tm = &alarm->time;
395 int ret;
396 u8 regs[8];
397
398 /* Activate all the alarms with AE_x bit */
399 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
400 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
401 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
402 | RV3029_A_AE_X;
403 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
404 | RV3029_A_AE_X;
405 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
406 | RV3029_A_AE_X;
407 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
408 | RV3029_A_AE_X;
409 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
410 | RV3029_A_AE_X;
411
412 /* Write the alarm */
413 ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
414 RV3029_ALARM_SECTION_LEN);
415 if (ret < 0)
416 return ret;
417
418 return rv3029_alarm_irq_enable(dev, alarm->enabled);
419}
420
421static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
422{
423 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
424 u8 regs[8];
425 int ret;
426
427 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
428 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
429 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
430 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
431 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
432 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
433 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
434
435 ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
436 RV3029_WATCH_SECTION_LEN);
437 if (ret < 0)
438 return ret;
439
440 /* clear PON and VLOW2 bits */
441 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
442 RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0);
443}
444
445static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
446{
447 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
448 unsigned long vl = 0;
449 int sr, ret = 0;
450
451 switch (cmd) {
452 case RTC_VL_READ:
453 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
454 if (ret < 0)
455 return ret;
456
457 if (sr & RV3029_STATUS_VLOW1)
458 vl = RTC_VL_ACCURACY_LOW;
459
460 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
461 vl |= RTC_VL_DATA_INVALID;
462
463 return put_user(vl, (unsigned int __user *)arg);
464
465 case RTC_VL_CLR:
466 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
467 RV3029_STATUS_VLOW1, 0);
468
469 default:
470 return -ENOIOCTLCMD;
471 }
472}
473
474static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
475 size_t bytes)
476{
477 return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
478}
479
480static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
481 size_t bytes)
482{
483 return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
484}
485
486static const struct rv3029_trickle_tab_elem {
487 u32 r; /* resistance in ohms */
488 u8 conf; /* trickle config bits */
489} rv3029_trickle_tab[] = {
490 {
491 .r = 1076,
492 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
493 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
494 }, {
495 .r = 1091,
496 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
497 RV3029_TRICKLE_20K,
498 }, {
499 .r = 1137,
500 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
501 RV3029_TRICKLE_80K,
502 }, {
503 .r = 1154,
504 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
505 }, {
506 .r = 1371,
507 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
508 RV3029_TRICKLE_80K,
509 }, {
510 .r = 1395,
511 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
512 }, {
513 .r = 1472,
514 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
515 }, {
516 .r = 1500,
517 .conf = RV3029_TRICKLE_1K,
518 }, {
519 .r = 3810,
520 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
521 RV3029_TRICKLE_80K,
522 }, {
523 .r = 4000,
524 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
525 }, {
526 .r = 4706,
527 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
528 }, {
529 .r = 5000,
530 .conf = RV3029_TRICKLE_5K,
531 }, {
532 .r = 16000,
533 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
534 }, {
535 .r = 20000,
536 .conf = RV3029_TRICKLE_20K,
537 }, {
538 .r = 80000,
539 .conf = RV3029_TRICKLE_80K,
540 },
541};
542
543static void rv3029_trickle_config(struct device *dev)
544{
545 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
546 struct device_node *of_node = dev->of_node;
547 const struct rv3029_trickle_tab_elem *elem;
548 int i, err;
549 u32 ohms;
550 u8 trickle_set_bits;
551
552 if (!of_node)
553 return;
554
555 /* Configure the trickle charger. */
556 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
557 if (err) {
558 /* Disable trickle charger. */
559 trickle_set_bits = 0;
560 } else {
561 /* Enable trickle charger. */
562 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
563 elem = &rv3029_trickle_tab[i];
564 if (elem->r >= ohms)
565 break;
566 }
567 trickle_set_bits = elem->conf;
568 dev_info(dev,
569 "Trickle charger enabled at %d ohms resistance.\n",
570 elem->r);
571 }
572 err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
573 RV3029_TRICKLE_MASK,
574 trickle_set_bits);
575 if (err < 0)
576 dev_err(dev, "Failed to update trickle charger config\n");
577}
578
579#ifdef CONFIG_RTC_DRV_RV3029_HWMON
580
581static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
582{
583 unsigned int temp;
584 int ret;
585
586 ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
587 if (ret < 0)
588 return ret;
589
590 *temp_mC = ((int)temp - 60) * 1000;
591
592 return 0;
593}
594
595static ssize_t rv3029_hwmon_show_temp(struct device *dev,
596 struct device_attribute *attr,
597 char *buf)
598{
599 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
600 int ret, temp_mC;
601
602 ret = rv3029_read_temp(rv3029, &temp_mC);
603 if (ret < 0)
604 return ret;
605
606 return sprintf(buf, "%d\n", temp_mC);
607}
608
609static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
610 struct device_attribute *attr,
611 const char *buf,
612 size_t count)
613{
614 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
615 unsigned int th_set_bits = 0;
616 unsigned long interval_ms;
617 int ret;
618
619 ret = kstrtoul(buf, 10, &interval_ms);
620 if (ret < 0)
621 return ret;
622
623 if (interval_ms != 0) {
624 th_set_bits |= RV3029_EECTRL_THE;
625 if (interval_ms >= 16000)
626 th_set_bits |= RV3029_EECTRL_THP;
627 }
628 ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
629 RV3029_EECTRL_THE | RV3029_EECTRL_THP,
630 th_set_bits);
631 if (ret < 0)
632 return ret;
633
634 return count;
635}
636
637static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
638 struct device_attribute *attr,
639 char *buf)
640{
641 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
642 int ret, interval_ms;
643 u8 eectrl;
644
645 ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
646 &eectrl, 1);
647 if (ret < 0)
648 return ret;
649
650 if (eectrl & RV3029_EECTRL_THE) {
651 if (eectrl & RV3029_EECTRL_THP)
652 interval_ms = 16000;
653 else
654 interval_ms = 1000;
655 } else {
656 interval_ms = 0;
657 }
658
659 return sprintf(buf, "%d\n", interval_ms);
660}
661
662static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
663 NULL, 0);
664static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
665 rv3029_hwmon_show_update_interval,
666 rv3029_hwmon_set_update_interval, 0);
667
668static struct attribute *rv3029_hwmon_attrs[] = {
669 &sensor_dev_attr_temp1_input.dev_attr.attr,
670 &sensor_dev_attr_update_interval.dev_attr.attr,
671 NULL,
672};
673ATTRIBUTE_GROUPS(rv3029_hwmon);
674
675static void rv3029_hwmon_register(struct device *dev, const char *name)
676{
677 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
678 struct device *hwmon_dev;
679
680 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
681 rv3029_hwmon_groups);
682 if (IS_ERR(hwmon_dev)) {
683 dev_warn(dev, "unable to register hwmon device %ld\n",
684 PTR_ERR(hwmon_dev));
685 }
686}
687
688#else /* CONFIG_RTC_DRV_RV3029_HWMON */
689
690static void rv3029_hwmon_register(struct device *dev, const char *name)
691{
692}
693
694#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
695
696static const struct rtc_class_ops rv3029_rtc_ops = {
697 .read_time = rv3029_read_time,
698 .set_time = rv3029_set_time,
699 .ioctl = rv3029_ioctl,
700 .read_alarm = rv3029_read_alarm,
701 .set_alarm = rv3029_set_alarm,
702 .alarm_irq_enable = rv3029_alarm_irq_enable,
703};
704
705static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
706 const char *name)
707{
708 struct rv3029_data *rv3029;
709 struct nvmem_config nvmem_cfg = {
710 .name = "rv3029_nvram",
711 .word_size = 1,
712 .stride = 1,
713 .size = RV3029_RAM_SECTION_LEN,
714 .type = NVMEM_TYPE_BATTERY_BACKED,
715 .reg_read = rv3029_nvram_read,
716 .reg_write = rv3029_nvram_write,
717 };
718 int rc = 0;
719
720 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
721 if (!rv3029)
722 return -ENOMEM;
723
724 rv3029->regmap = regmap;
725 rv3029->irq = irq;
726 rv3029->dev = dev;
727 dev_set_drvdata(dev, rv3029);
728
729 rv3029_trickle_config(dev);
730 rv3029_hwmon_register(dev, name);
731
732 rv3029->rtc = devm_rtc_allocate_device(dev);
733 if (IS_ERR(rv3029->rtc))
734 return PTR_ERR(rv3029->rtc);
735
736 if (rv3029->irq > 0) {
737 rc = devm_request_threaded_irq(dev, rv3029->irq,
738 NULL, rv3029_handle_irq,
739 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
740 "rv3029", dev);
741 if (rc) {
742 dev_warn(dev, "unable to request IRQ, alarms disabled\n");
743 rv3029->irq = 0;
744 }
745 }
746 if (!rv3029->irq)
747 clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);
748
749 rv3029->rtc->ops = &rv3029_rtc_ops;
750 rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
751 rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
752
753 rc = devm_rtc_register_device(rv3029->rtc);
754 if (rc)
755 return rc;
756
757 nvmem_cfg.priv = rv3029->regmap;
758 devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);
759
760 return 0;
761}
762
763static const struct regmap_range rv3029_holes_range[] = {
764 regmap_reg_range(0x05, 0x07),
765 regmap_reg_range(0x0f, 0x0f),
766 regmap_reg_range(0x17, 0x17),
767 regmap_reg_range(0x1a, 0x1f),
768 regmap_reg_range(0x21, 0x27),
769 regmap_reg_range(0x34, 0x37),
770};
771
772static const struct regmap_access_table rv3029_regs = {
773 .no_ranges = rv3029_holes_range,
774 .n_no_ranges = ARRAY_SIZE(rv3029_holes_range),
775};
776
777static const struct regmap_config config = {
778 .reg_bits = 8,
779 .val_bits = 8,
780 .rd_table = &rv3029_regs,
781 .wr_table = &rv3029_regs,
782 .max_register = 0x3f,
783};
784
785#if IS_ENABLED(CONFIG_I2C)
786
787static int rv3029_i2c_probe(struct i2c_client *client)
788{
789 struct regmap *regmap;
790 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
791 I2C_FUNC_SMBUS_BYTE)) {
792 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
793 return -ENODEV;
794 }
795
796 regmap = devm_regmap_init_i2c(client, &config);
797 if (IS_ERR(regmap))
798 return PTR_ERR(regmap);
799
800 return rv3029_probe(&client->dev, regmap, client->irq, client->name);
801}
802
803static const struct i2c_device_id rv3029_id[] = {
804 { "rv3029", 0 },
805 { "rv3029c2", 0 },
806 { }
807};
808MODULE_DEVICE_TABLE(i2c, rv3029_id);
809
810static const __maybe_unused struct of_device_id rv3029_of_match[] = {
811 { .compatible = "microcrystal,rv3029" },
812 { }
813};
814MODULE_DEVICE_TABLE(of, rv3029_of_match);
815
816static struct i2c_driver rv3029_driver = {
817 .driver = {
818 .name = "rv3029",
819 .of_match_table = of_match_ptr(rv3029_of_match),
820 },
821 .probe_new = rv3029_i2c_probe,
822 .id_table = rv3029_id,
823};
824
825static int __init rv3029_register_driver(void)
826{
827 return i2c_add_driver(&rv3029_driver);
828}
829
830static void rv3029_unregister_driver(void)
831{
832 i2c_del_driver(&rv3029_driver);
833}
834
835#else
836
837static int __init rv3029_register_driver(void)
838{
839 return 0;
840}
841
842static void rv3029_unregister_driver(void)
843{
844}
845
846#endif
847
848#if IS_ENABLED(CONFIG_SPI_MASTER)
849
850static int rv3049_probe(struct spi_device *spi)
851{
852 struct regmap *regmap;
853
854 regmap = devm_regmap_init_spi(spi, &config);
855 if (IS_ERR(regmap))
856 return PTR_ERR(regmap);
857
858 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
859}
860
861static struct spi_driver rv3049_driver = {
862 .driver = {
863 .name = "rv3049",
864 },
865 .probe = rv3049_probe,
866};
867
868static int __init rv3049_register_driver(void)
869{
870 return spi_register_driver(&rv3049_driver);
871}
872
873static void __exit rv3049_unregister_driver(void)
874{
875 spi_unregister_driver(&rv3049_driver);
876}
877
878#else
879
880static int __init rv3049_register_driver(void)
881{
882 return 0;
883}
884
885static void __exit rv3049_unregister_driver(void)
886{
887}
888
889#endif
890
891static int __init rv30x9_init(void)
892{
893 int ret;
894
895 ret = rv3029_register_driver();
896 if (ret)
897 return ret;
898
899 ret = rv3049_register_driver();
900 if (ret)
901 rv3029_unregister_driver();
902
903 return ret;
904}
905module_init(rv30x9_init)
906
907static void __exit rv30x9_exit(void)
908{
909 rv3049_unregister_driver();
910 rv3029_unregister_driver();
911}
912module_exit(rv30x9_exit)
913
914MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
915MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
916MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
917MODULE_LICENSE("GPL");
918MODULE_ALIAS("spi:rv3049");