This source file includes following definitions.
- rv3029_read_regs
- rv3029_write_regs
- rv3029_update_bits
- rv3029_get_sr
- rv3029_set_sr
- rv3029_eeprom_busywait
- rv3029_eeprom_exit
- rv3029_eeprom_enter
- rv3029_eeprom_read
- rv3029_eeprom_write
- rv3029_eeprom_update_bits
- rv3029_handle_irq
- rv3029_read_time
- rv3029_read_alarm
- rv3029_alarm_irq_enable
- rv3029_set_alarm
- rv3029_set_time
- rv3029_trickle_config
- rv3029_read_temp
- rv3029_hwmon_show_temp
- rv3029_hwmon_set_update_interval
- rv3029_hwmon_show_update_interval
- rv3029_hwmon_register
- rv3029_hwmon_register
- rv3029_probe
- rv3029_i2c_probe
- rv3029_register_driver
- rv3029_unregister_driver
- rv3029_register_driver
- rv3029_unregister_driver
- rv3049_probe
- rv3049_register_driver
- rv3049_unregister_driver
- rv3049_register_driver
- rv3049_unregister_driver
- rv30x9_init
- module_init
1
2
3
4
5
6
7
8
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
23
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
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)
60 #define RV3029_REG_HR_PM BIT(5)
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
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
79 #define RV3029_TIMER_LOW 0x18
80 #define RV3029_TIMER_HIGH 0x19
81
82
83 #define RV3029_TEMP_PAGE 0x20
84
85
86 #define RV3029_E2P_EEDATA1 0x28
87 #define RV3029_E2P_EEDATA2 0x29
88 #define RV3029_E2PDATA_SECTION_LEN 0x02
89
90
91 #define RV3029_CONTROL_E2P_EECTRL 0x30
92 #define RV3029_EECTRL_THP BIT(0)
93 #define RV3029_EECTRL_THE BIT(1)
94 #define RV3029_EECTRL_FD0 BIT(2)
95 #define RV3029_EECTRL_FD1 BIT(3)
96 #define RV3029_TRICKLE_1K BIT(4)
97 #define RV3029_TRICKLE_5K BIT(5)
98 #define RV3029_TRICKLE_20K BIT(6)
99 #define RV3029_TRICKLE_80K BIT(7)
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
106 #define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7)
107 #define RV3029_CONTROL_E2P_QCOEF 0x32
108 #define RV3029_CONTROL_E2P_TURNOVER 0x33
109 #define RV3029_CONTROL_E2P_TOV_MASK 0x3F
110
111
112 #define RV3029_USR1_RAM_PAGE 0x38
113 #define RV3029_USR1_SECTION_LEN 0x04
114 #define RV3029_USR2_RAM_PAGE 0x3C
115 #define RV3029_USR2_SECTION_LEN 0x04
116
117 struct rv3029_data {
118 struct device *dev;
119 struct rtc_device *rtc;
120 struct regmap *regmap;
121 int irq;
122 };
123
124 static int rv3029_read_regs(struct device *dev, u8 reg, u8 *buf,
125 unsigned int len)
126 {
127 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
128
129 if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
130 (reg + len > RV3029_USR1_RAM_PAGE + 8))
131 return -EINVAL;
132
133 return regmap_bulk_read(rv3029->regmap, reg, buf, len);
134 }
135
136 static int rv3029_write_regs(struct device *dev, u8 reg, u8 const buf[],
137 unsigned int len)
138 {
139 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
140
141 if ((reg > RV3029_USR1_RAM_PAGE + 7) ||
142 (reg + len > RV3029_USR1_RAM_PAGE + 8))
143 return -EINVAL;
144
145 return regmap_bulk_write(rv3029->regmap, reg, buf, len);
146 }
147
148 static int rv3029_update_bits(struct device *dev, u8 reg, u8 mask, u8 set)
149 {
150 u8 buf;
151 int ret;
152
153 ret = rv3029_read_regs(dev, reg, &buf, 1);
154 if (ret < 0)
155 return ret;
156 buf &= ~mask;
157 buf |= set & mask;
158 ret = rv3029_write_regs(dev, reg, &buf, 1);
159 if (ret < 0)
160 return ret;
161
162 return 0;
163 }
164
165 static int rv3029_get_sr(struct device *dev, u8 *buf)
166 {
167 int ret = rv3029_read_regs(dev, RV3029_STATUS, buf, 1);
168
169 if (ret < 0)
170 return -EIO;
171 dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
172 return 0;
173 }
174
175 static int rv3029_set_sr(struct device *dev, u8 val)
176 {
177 u8 buf[1];
178 int sr;
179
180 buf[0] = val;
181 sr = rv3029_write_regs(dev, RV3029_STATUS, buf, 1);
182 dev_dbg(dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
183 if (sr < 0)
184 return -EIO;
185 return 0;
186 }
187
188 static int rv3029_eeprom_busywait(struct device *dev)
189 {
190 int i, ret;
191 u8 sr;
192
193 for (i = 100; i > 0; i--) {
194 ret = rv3029_get_sr(dev, &sr);
195 if (ret < 0)
196 break;
197 if (!(sr & RV3029_STATUS_EEBUSY))
198 break;
199 usleep_range(1000, 10000);
200 }
201 if (i <= 0) {
202 dev_err(dev, "EEPROM busy wait timeout.\n");
203 return -ETIMEDOUT;
204 }
205
206 return ret;
207 }
208
209 static int rv3029_eeprom_exit(struct device *dev)
210 {
211
212 return rv3029_update_bits(dev, RV3029_ONOFF_CTRL,
213 RV3029_ONOFF_CTRL_EERE,
214 RV3029_ONOFF_CTRL_EERE);
215 }
216
217 static int rv3029_eeprom_enter(struct device *dev)
218 {
219 int ret;
220 u8 sr;
221
222
223 ret = rv3029_get_sr(dev, &sr);
224 if (ret < 0)
225 return ret;
226 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
227
228
229
230 sr &= ~RV3029_STATUS_VLOW1;
231 sr &= ~RV3029_STATUS_VLOW2;
232 ret = rv3029_set_sr(dev, sr);
233 if (ret < 0)
234 return ret;
235 usleep_range(1000, 10000);
236 ret = rv3029_get_sr(dev, &sr);
237 if (ret < 0)
238 return ret;
239 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
240 dev_err(dev,
241 "Supply voltage is too low to safely access the EEPROM.\n");
242 return -ENODEV;
243 }
244 }
245
246
247 ret = rv3029_update_bits(dev, RV3029_ONOFF_CTRL, RV3029_ONOFF_CTRL_EERE,
248 0);
249 if (ret < 0)
250 return ret;
251
252
253 ret = rv3029_eeprom_busywait(dev);
254 if (ret < 0)
255 rv3029_eeprom_exit(dev);
256
257 return ret;
258 }
259
260 static int rv3029_eeprom_read(struct device *dev, u8 reg,
261 u8 buf[], size_t len)
262 {
263 int ret, err;
264
265 err = rv3029_eeprom_enter(dev);
266 if (err < 0)
267 return err;
268
269 ret = rv3029_read_regs(dev, reg, buf, len);
270
271 err = rv3029_eeprom_exit(dev);
272 if (err < 0)
273 return err;
274
275 return ret;
276 }
277
278 static int rv3029_eeprom_write(struct device *dev, u8 reg,
279 u8 const buf[], size_t len)
280 {
281 int ret, err;
282 size_t i;
283 u8 tmp;
284
285 err = rv3029_eeprom_enter(dev);
286 if (err < 0)
287 return err;
288
289 for (i = 0; i < len; i++, reg++) {
290 ret = rv3029_read_regs(dev, reg, &tmp, 1);
291 if (ret < 0)
292 break;
293 if (tmp != buf[i]) {
294 ret = rv3029_write_regs(dev, reg, &buf[i], 1);
295 if (ret < 0)
296 break;
297 }
298 ret = rv3029_eeprom_busywait(dev);
299 if (ret < 0)
300 break;
301 }
302
303 err = rv3029_eeprom_exit(dev);
304 if (err < 0)
305 return err;
306
307 return ret;
308 }
309
310 static int rv3029_eeprom_update_bits(struct device *dev,
311 u8 reg, u8 mask, u8 set)
312 {
313 u8 buf;
314 int ret;
315
316 ret = rv3029_eeprom_read(dev, reg, &buf, 1);
317 if (ret < 0)
318 return ret;
319 buf &= ~mask;
320 buf |= set & mask;
321 ret = rv3029_eeprom_write(dev, reg, &buf, 1);
322 if (ret < 0)
323 return ret;
324
325 return 0;
326 }
327
328 static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
329 {
330 struct device *dev = dev_id;
331 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
332 struct mutex *lock = &rv3029->rtc->ops_lock;
333 unsigned long events = 0;
334 u8 flags, controls;
335 int ret;
336
337 mutex_lock(lock);
338
339 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
340 if (ret) {
341 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
342 mutex_unlock(lock);
343 return IRQ_NONE;
344 }
345
346 ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
347 if (ret) {
348 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
349 mutex_unlock(lock);
350 return IRQ_NONE;
351 }
352
353 if (flags & RV3029_IRQ_FLAGS_AF) {
354 flags &= ~RV3029_IRQ_FLAGS_AF;
355 controls &= ~RV3029_IRQ_CTRL_AIE;
356 events |= RTC_AF;
357 }
358
359 if (events) {
360 rtc_update_irq(rv3029->rtc, 1, events);
361 rv3029_write_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
362 rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
363 }
364 mutex_unlock(lock);
365
366 return IRQ_HANDLED;
367 }
368
369 static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
370 {
371 u8 buf[1];
372 int ret;
373 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
374
375 ret = rv3029_get_sr(dev, buf);
376 if (ret < 0) {
377 dev_err(dev, "%s: reading SR failed\n", __func__);
378 return -EIO;
379 }
380
381 ret = rv3029_read_regs(dev, RV3029_W_SEC, regs,
382 RV3029_WATCH_SECTION_LEN);
383 if (ret < 0) {
384 dev_err(dev, "%s: reading RTC section failed\n", __func__);
385 return ret;
386 }
387
388 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
389 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
390
391
392 {
393 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
394
395 if (_hr & RV3029_REG_HR_12_24) {
396
397 tm->tm_hour = bcd2bin(_hr & 0x1f);
398 if (_hr & RV3029_REG_HR_PM)
399 tm->tm_hour += 12;
400 } else
401 tm->tm_hour = bcd2bin(_hr & 0x3f);
402 }
403
404 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
405 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
406 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
407 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
408
409 return 0;
410 }
411
412 static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
413 {
414 struct rtc_time *const tm = &alarm->time;
415 int ret;
416 u8 regs[8], controls, flags;
417
418 ret = rv3029_get_sr(dev, regs);
419 if (ret < 0) {
420 dev_err(dev, "%s: reading SR failed\n", __func__);
421 return -EIO;
422 }
423
424 ret = rv3029_read_regs(dev, RV3029_A_SC, regs,
425 RV3029_ALARM_SECTION_LEN);
426
427 if (ret < 0) {
428 dev_err(dev, "%s: reading alarm section failed\n", __func__);
429 return ret;
430 }
431
432 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
433 if (ret) {
434 dev_err(dev, "Read IRQ Control Register error %d\n", ret);
435 return ret;
436 }
437 ret = rv3029_read_regs(dev, RV3029_IRQ_FLAGS, &flags, 1);
438 if (ret < 0) {
439 dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
440 return ret;
441 }
442
443 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
444 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
445 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
446 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
447 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
448 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
449 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
450
451 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
452 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
453
454 return 0;
455 }
456
457 static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
458 {
459 int ret;
460 u8 controls;
461
462 ret = rv3029_read_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
463 if (ret < 0) {
464 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
465 return ret;
466 }
467
468
469 if (enable)
470 controls |= RV3029_IRQ_CTRL_AIE;
471 else
472 controls &= ~RV3029_IRQ_CTRL_AIE;
473
474 ret = rv3029_write_regs(dev, RV3029_IRQ_CTRL, &controls, 1);
475 if (ret < 0) {
476 dev_err(dev, "can't update INT reg\n");
477 return ret;
478 }
479
480 return 0;
481 }
482
483 static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
484 {
485 struct rtc_time *const tm = &alarm->time;
486 int ret;
487 u8 regs[8];
488
489
490
491
492
493
494 if (tm->tm_year < 100)
495 return -EINVAL;
496
497 ret = rv3029_get_sr(dev, regs);
498 if (ret < 0) {
499 dev_err(dev, "%s: reading SR failed\n", __func__);
500 return -EIO;
501 }
502
503
504 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
505 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
506 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
507 | RV3029_A_AE_X;
508 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
509 | RV3029_A_AE_X;
510 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
511 | RV3029_A_AE_X;
512 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
513 | RV3029_A_AE_X;
514 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
515 | RV3029_A_AE_X;
516
517
518 ret = rv3029_write_regs(dev, RV3029_A_SC, regs,
519 RV3029_ALARM_SECTION_LEN);
520 if (ret < 0)
521 return ret;
522
523 if (alarm->enabled) {
524
525 ret = rv3029_alarm_irq_enable(dev, 1);
526 if (ret)
527 return ret;
528 } else {
529
530 ret = rv3029_alarm_irq_enable(dev, 0);
531 if (ret)
532 return ret;
533 }
534
535 return 0;
536 }
537
538 static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
539 {
540 u8 regs[8];
541 int ret;
542
543
544
545
546
547
548 if (tm->tm_year < 100)
549 return -EINVAL;
550
551 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
552 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
553 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
554 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
555 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
556 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
557 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
558
559 ret = rv3029_write_regs(dev, RV3029_W_SEC, regs,
560 RV3029_WATCH_SECTION_LEN);
561 if (ret < 0)
562 return ret;
563
564 ret = rv3029_get_sr(dev, regs);
565 if (ret < 0) {
566 dev_err(dev, "%s: reading SR failed\n", __func__);
567 return ret;
568 }
569
570 ret = rv3029_set_sr(dev, (regs[0] & ~RV3029_STATUS_PON));
571 if (ret < 0) {
572 dev_err(dev, "%s: reading SR failed\n", __func__);
573 return ret;
574 }
575
576 return 0;
577 }
578
579 static const struct rv3029_trickle_tab_elem {
580 u32 r;
581 u8 conf;
582 } rv3029_trickle_tab[] = {
583 {
584 .r = 1076,
585 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
586 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
587 }, {
588 .r = 1091,
589 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
590 RV3029_TRICKLE_20K,
591 }, {
592 .r = 1137,
593 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
594 RV3029_TRICKLE_80K,
595 }, {
596 .r = 1154,
597 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
598 }, {
599 .r = 1371,
600 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
601 RV3029_TRICKLE_80K,
602 }, {
603 .r = 1395,
604 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
605 }, {
606 .r = 1472,
607 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
608 }, {
609 .r = 1500,
610 .conf = RV3029_TRICKLE_1K,
611 }, {
612 .r = 3810,
613 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
614 RV3029_TRICKLE_80K,
615 }, {
616 .r = 4000,
617 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
618 }, {
619 .r = 4706,
620 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
621 }, {
622 .r = 5000,
623 .conf = RV3029_TRICKLE_5K,
624 }, {
625 .r = 16000,
626 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
627 }, {
628 .r = 20000,
629 .conf = RV3029_TRICKLE_20K,
630 }, {
631 .r = 80000,
632 .conf = RV3029_TRICKLE_80K,
633 },
634 };
635
636 static void rv3029_trickle_config(struct device *dev)
637 {
638 struct device_node *of_node = dev->of_node;
639 const struct rv3029_trickle_tab_elem *elem;
640 int i, err;
641 u32 ohms;
642 u8 trickle_set_bits;
643
644 if (!of_node)
645 return;
646
647
648 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
649 if (err) {
650
651 trickle_set_bits = 0;
652 } else {
653
654 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
655 elem = &rv3029_trickle_tab[i];
656 if (elem->r >= ohms)
657 break;
658 }
659 trickle_set_bits = elem->conf;
660 dev_info(dev,
661 "Trickle charger enabled at %d ohms resistance.\n",
662 elem->r);
663 }
664 err = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
665 RV3029_TRICKLE_MASK,
666 trickle_set_bits);
667 if (err < 0)
668 dev_err(dev, "Failed to update trickle charger config\n");
669 }
670
671 #ifdef CONFIG_RTC_DRV_RV3029_HWMON
672
673 static int rv3029_read_temp(struct device *dev, int *temp_mC)
674 {
675 int ret;
676 u8 temp;
677
678 ret = rv3029_read_regs(dev, RV3029_TEMP_PAGE, &temp, 1);
679 if (ret < 0)
680 return ret;
681
682 *temp_mC = ((int)temp - 60) * 1000;
683
684 return 0;
685 }
686
687 static ssize_t rv3029_hwmon_show_temp(struct device *dev,
688 struct device_attribute *attr,
689 char *buf)
690 {
691 int ret, temp_mC;
692
693 ret = rv3029_read_temp(dev, &temp_mC);
694 if (ret < 0)
695 return ret;
696
697 return sprintf(buf, "%d\n", temp_mC);
698 }
699
700 static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
701 struct device_attribute *attr,
702 const char *buf,
703 size_t count)
704 {
705 unsigned long interval_ms;
706 int ret;
707 u8 th_set_bits = 0;
708
709 ret = kstrtoul(buf, 10, &interval_ms);
710 if (ret < 0)
711 return ret;
712
713 if (interval_ms != 0) {
714 th_set_bits |= RV3029_EECTRL_THE;
715 if (interval_ms >= 16000)
716 th_set_bits |= RV3029_EECTRL_THP;
717 }
718 ret = rv3029_eeprom_update_bits(dev, RV3029_CONTROL_E2P_EECTRL,
719 RV3029_EECTRL_THE | RV3029_EECTRL_THP,
720 th_set_bits);
721 if (ret < 0)
722 return ret;
723
724 return count;
725 }
726
727 static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
728 struct device_attribute *attr,
729 char *buf)
730 {
731 int ret, interval_ms;
732 u8 eectrl;
733
734 ret = rv3029_eeprom_read(dev, RV3029_CONTROL_E2P_EECTRL,
735 &eectrl, 1);
736 if (ret < 0)
737 return ret;
738
739 if (eectrl & RV3029_EECTRL_THE) {
740 if (eectrl & RV3029_EECTRL_THP)
741 interval_ms = 16000;
742 else
743 interval_ms = 1000;
744 } else {
745 interval_ms = 0;
746 }
747
748 return sprintf(buf, "%d\n", interval_ms);
749 }
750
751 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
752 NULL, 0);
753 static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
754 rv3029_hwmon_show_update_interval,
755 rv3029_hwmon_set_update_interval, 0);
756
757 static struct attribute *rv3029_hwmon_attrs[] = {
758 &sensor_dev_attr_temp1_input.dev_attr.attr,
759 &sensor_dev_attr_update_interval.dev_attr.attr,
760 NULL,
761 };
762 ATTRIBUTE_GROUPS(rv3029_hwmon);
763
764 static void rv3029_hwmon_register(struct device *dev, const char *name)
765 {
766 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
767 struct device *hwmon_dev;
768
769 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
770 rv3029_hwmon_groups);
771 if (IS_ERR(hwmon_dev)) {
772 dev_warn(dev, "unable to register hwmon device %ld\n",
773 PTR_ERR(hwmon_dev));
774 }
775 }
776
777 #else
778
779 static void rv3029_hwmon_register(struct device *dev, const char *name)
780 {
781 }
782
783 #endif
784
785 static struct rtc_class_ops rv3029_rtc_ops = {
786 .read_time = rv3029_read_time,
787 .set_time = rv3029_set_time,
788 };
789
790 static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
791 const char *name)
792 {
793 struct rv3029_data *rv3029;
794 int rc = 0;
795 u8 buf[1];
796
797 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
798 if (!rv3029)
799 return -ENOMEM;
800
801 rv3029->regmap = regmap;
802 rv3029->irq = irq;
803 rv3029->dev = dev;
804 dev_set_drvdata(dev, rv3029);
805
806 rc = rv3029_get_sr(dev, buf);
807 if (rc < 0) {
808 dev_err(dev, "reading status failed\n");
809 return rc;
810 }
811
812 rv3029_trickle_config(dev);
813 rv3029_hwmon_register(dev, name);
814
815 rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
816 THIS_MODULE);
817 if (IS_ERR(rv3029->rtc)) {
818 dev_err(dev, "unable to register the class device\n");
819 return PTR_ERR(rv3029->rtc);
820 }
821
822 if (rv3029->irq > 0) {
823 rc = devm_request_threaded_irq(dev, rv3029->irq,
824 NULL, rv3029_handle_irq,
825 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
826 "rv3029", dev);
827 if (rc) {
828 dev_warn(dev, "unable to request IRQ, alarms disabled\n");
829 rv3029->irq = 0;
830 } else {
831 rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
832 rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
833 rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
834 }
835 }
836
837 return 0;
838 }
839
840 #if IS_ENABLED(CONFIG_I2C)
841
842 static int rv3029_i2c_probe(struct i2c_client *client,
843 const struct i2c_device_id *id)
844 {
845 struct regmap *regmap;
846 static const struct regmap_config config = {
847 .reg_bits = 8,
848 .val_bits = 8,
849 };
850
851 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
852 I2C_FUNC_SMBUS_BYTE)) {
853 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
854 return -ENODEV;
855 }
856
857 regmap = devm_regmap_init_i2c(client, &config);
858 if (IS_ERR(regmap)) {
859 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
860 __func__, PTR_ERR(regmap));
861 return PTR_ERR(regmap);
862 }
863
864 return rv3029_probe(&client->dev, regmap, client->irq, client->name);
865 }
866
867 static const struct i2c_device_id rv3029_id[] = {
868 { "rv3029", 0 },
869 { "rv3029c2", 0 },
870 { }
871 };
872 MODULE_DEVICE_TABLE(i2c, rv3029_id);
873
874 static const struct of_device_id rv3029_of_match[] = {
875 { .compatible = "microcrystal,rv3029" },
876
877 { .compatible = "rv3029" },
878 { .compatible = "rv3029c2" },
879 { .compatible = "mc,rv3029c2" },
880 { }
881 };
882 MODULE_DEVICE_TABLE(of, rv3029_of_match);
883
884 static struct i2c_driver rv3029_driver = {
885 .driver = {
886 .name = "rtc-rv3029c2",
887 .of_match_table = of_match_ptr(rv3029_of_match),
888 },
889 .probe = rv3029_i2c_probe,
890 .id_table = rv3029_id,
891 };
892
893 static int rv3029_register_driver(void)
894 {
895 return i2c_add_driver(&rv3029_driver);
896 }
897
898 static void rv3029_unregister_driver(void)
899 {
900 i2c_del_driver(&rv3029_driver);
901 }
902
903 #else
904
905 static int rv3029_register_driver(void)
906 {
907 return 0;
908 }
909
910 static void rv3029_unregister_driver(void)
911 {
912 }
913
914 #endif
915
916 #if IS_ENABLED(CONFIG_SPI_MASTER)
917
918 static int rv3049_probe(struct spi_device *spi)
919 {
920 static const struct regmap_config config = {
921 .reg_bits = 8,
922 .val_bits = 8,
923 };
924 struct regmap *regmap;
925
926 regmap = devm_regmap_init_spi(spi, &config);
927 if (IS_ERR(regmap)) {
928 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
929 __func__, PTR_ERR(regmap));
930 return PTR_ERR(regmap);
931 }
932
933 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
934 }
935
936 static struct spi_driver rv3049_driver = {
937 .driver = {
938 .name = "rv3049",
939 },
940 .probe = rv3049_probe,
941 };
942
943 static int rv3049_register_driver(void)
944 {
945 return spi_register_driver(&rv3049_driver);
946 }
947
948 static void rv3049_unregister_driver(void)
949 {
950 spi_unregister_driver(&rv3049_driver);
951 }
952
953 #else
954
955 static int rv3049_register_driver(void)
956 {
957 return 0;
958 }
959
960 static void rv3049_unregister_driver(void)
961 {
962 }
963
964 #endif
965
966 static int __init rv30x9_init(void)
967 {
968 int ret;
969
970 ret = rv3029_register_driver();
971 if (ret) {
972 pr_err("Failed to register rv3029 driver: %d\n", ret);
973 return ret;
974 }
975
976 ret = rv3049_register_driver();
977 if (ret) {
978 pr_err("Failed to register rv3049 driver: %d\n", ret);
979 rv3029_unregister_driver();
980 }
981
982 return ret;
983 }
984 module_init(rv30x9_init)
985
986 static void __exit rv30x9_exit(void)
987 {
988 rv3049_unregister_driver();
989 rv3029_unregister_driver();
990 }
991 module_exit(rv30x9_exit)
992
993 MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
994 MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
995 MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
996 MODULE_LICENSE("GPL");
997 MODULE_ALIAS("spi:rv3049");