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rtc: rv3029: drop rv3029_read_regs and rv3029_write_regs
[mirror_ubuntu-jammy-kernel.git] / drivers / rtc / rtc-rv3029c2.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
52365230 2/*
c2a1c145 3 * Micro Crystal RV-3029 / RV-3049 rtc class driver
52365230
HS		 4 *
5 * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
2dca3d9e 6 * Michael Buesch <m@bues.ch>
52365230
HS		 7 *
8 * based on previously existing rtc class drivers
52365230
HS		 9 */
10
11#include <linux/module.h>
12#include <linux/i2c.h>
c2a1c145 13#include <linux/spi/spi.h>
52365230
HS		 14#include <linux/bcd.h>
15#include <linux/rtc.h>
a7f6e287
MB		 16#include <linux/delay.h>
17#include <linux/of.h>
a696b31e
MB		 18#include <linux/hwmon.h>
19#include <linux/hwmon-sysfs.h>
e6e38082 20#include <linux/regmap.h>
52365230
HS		 21
22/* Register map */
23/* control section */
aba39d27 24#define RV3029_ONOFF_CTRL 0x00
7697de35
MB		 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)
aba39d27 33#define RV3029_IRQ_CTRL 0x01
7697de35
MB		 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)
aba39d27 39#define RV3029_IRQ_FLAGS 0x02
7697de35
MB		 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)
aba39d27 45#define RV3029_STATUS 0x03
7697de35
MB		 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)
aba39d27 51#define RV3029_RST_CTRL 0x04
7697de35 52#define RV3029_RST_CTRL_SYSR BIT(4)
aba39d27 53#define RV3029_CONTROL_SECTION_LEN 0x05
52365230
HS		 54
55/* watch section */
aba39d27
MB		 56#define RV3029_W_SEC 0x08
57#define RV3029_W_MINUTES 0x09
58#define RV3029_W_HOURS 0x0A
7697de35
MB		 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 */
aba39d27
MB		 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
52365230
HS		 66
67/* alarm section */
aba39d27
MB		 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
dc492e86 75#define RV3029_A_AE_X BIT(7)
aba39d27 76#define RV3029_ALARM_SECTION_LEN 0x07
52365230
HS		 77
78/* timer section */
aba39d27
MB		 79#define RV3029_TIMER_LOW 0x18
80#define RV3029_TIMER_HIGH 0x19
52365230
HS		 81
82/* temperature section */
aba39d27 83#define RV3029_TEMP_PAGE 0x20
52365230
HS		 84
85/* eeprom data section */
aba39d27
MB		 86#define RV3029_E2P_EEDATA1 0x28
87#define RV3029_E2P_EEDATA2 0x29
7697de35 88#define RV3029_E2PDATA_SECTION_LEN 0x02
52365230
HS		 89
90/* eeprom control section */
aba39d27 91#define RV3029_CONTROL_E2P_EECTRL 0x30
7697de35
MB		 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 */
52365230
HS		 110
111/* user ram section */
aba39d27
MB		 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
52365230 116
e6e38082
MJ		 117struct rv3029_data {
118 struct device *dev;
119 struct rtc_device *rtc;
120 struct regmap *regmap;
121 int irq;
122};
123
bb72dbba 124static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
a7f6e287 125{
bb72dbba 126 unsigned int sr;
a7f6e287 127 int i, ret;
a7f6e287
MB		 128
129 for (i = 100; i > 0; i--) {
bb72dbba 130 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 131 if (ret < 0)
132 break;
133 if (!(sr & RV3029_STATUS_EEBUSY))
134 break;
135 usleep_range(1000, 10000);
136 }
137 if (i <= 0) {
bb72dbba 138 dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
a7f6e287
MB		 139 return -ETIMEDOUT;
140 }
141
142 return ret;
143}
144
7518dd9a 145static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
a7f6e287
MB		 146{
147 /* Re-enable eeprom refresh */
609e97fe 148 return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
4e7f1a60
MJ		 149 RV3029_ONOFF_CTRL_EERE,
150 RV3029_ONOFF_CTRL_EERE);
a7f6e287
MB		 151}
152
7518dd9a 153static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
a7f6e287 154{
bb72dbba 155 unsigned int sr;
a7f6e287 156 int ret;
a7f6e287
MB		 157
158 /* Check whether we are in the allowed voltage range. */
bb72dbba 159 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 160 if (ret < 0)
161 return ret;
162 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
163 /* We clear the bits and retry once just in case
164 * we had a brown out in early startup.
165 */
54c5970d
AB		 166 ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
167 RV3029_STATUS_VLOW1 |
168 RV3029_STATUS_VLOW2, 0);
a7f6e287
MB		 169 if (ret < 0)
170 return ret;
171 usleep_range(1000, 10000);
bb72dbba 172 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 173 if (ret < 0)
174 return ret;
175 if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) {
7518dd9a 176 dev_err(rv3029->dev,
a7f6e287
MB		 177 "Supply voltage is too low to safely access the EEPROM.\n");
178 return -ENODEV;
179 }
180 }
181
182 /* Disable eeprom refresh. */
609e97fe
AB		 183 ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
184 RV3029_ONOFF_CTRL_EERE, 0);
a7f6e287
MB		 185 if (ret < 0)
186 return ret;
187
188 /* Wait for any previous eeprom accesses to finish. */
bb72dbba 189 ret = rv3029_eeprom_busywait(rv3029);
a7f6e287 190 if (ret < 0)
7518dd9a 191 rv3029_eeprom_exit(rv3029);
a7f6e287
MB		 192
193 return ret;
194}
195
7518dd9a 196static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,
a7f6e287
MB		 197 u8 buf[], size_t len)
198{
199 int ret, err;
200
7518dd9a 201 err = rv3029_eeprom_enter(rv3029);
a7f6e287
MB		 202 if (err < 0)
203 return err;
204
7518dd9a 205 ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);
a7f6e287 206
7518dd9a 207 err = rv3029_eeprom_exit(rv3029);
a7f6e287
MB		 208 if (err < 0)
209 return err;
210
211 return ret;
212}
213
7518dd9a 214static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,
a7f6e287
MB		 215 u8 const buf[], size_t len)
216{
7518dd9a 217 unsigned int tmp;
a6f26606 218 int ret, err;
a7f6e287 219 size_t i;
a7f6e287 220
7518dd9a 221 err = rv3029_eeprom_enter(rv3029);
a6f26606
DC		 222 if (err < 0)
223 return err;
a7f6e287
MB		 224
225 for (i = 0; i < len; i++, reg++) {
7518dd9a 226 ret = regmap_read(rv3029->regmap, reg, &tmp);
a7f6e287
MB		 227 if (ret < 0)
228 break;
229 if (tmp != buf[i]) {
7518dd9a
AB		 230 tmp = buf[i];
231 ret = regmap_write(rv3029->regmap, reg, tmp);
a7f6e287
MB		 232 if (ret < 0)
233 break;
234 }
bb72dbba 235 ret = rv3029_eeprom_busywait(rv3029);
a7f6e287
MB		 236 if (ret < 0)
237 break;
238 }
239
7518dd9a 240 err = rv3029_eeprom_exit(rv3029);
a6f26606
DC		 241 if (err < 0)
242 return err;
a7f6e287 243
a6f26606 244 return ret;
a7f6e287
MB		 245}
246
7518dd9a 247static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,
39387dc2
MB		 248 u8 reg, u8 mask, u8 set)
249{
250 u8 buf;
251 int ret;
252
7518dd9a 253 ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);
39387dc2
MB		 254 if (ret < 0)
255 return ret;
256 buf &= ~mask;
257 buf |= set & mask;
7518dd9a 258 ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);
39387dc2
MB		 259 if (ret < 0)
260 return ret;
261
262 return 0;
263}
264
0ddc5b89
MJ		 265static irqreturn_t rv3029_handle_irq(int irq, void *dev_id)
266{
267 struct device *dev = dev_id;
268 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
269 struct mutex *lock = &rv3029->rtc->ops_lock;
7518dd9a 270 unsigned int flags, controls;
0ddc5b89 271 unsigned long events = 0;
0ddc5b89
MJ		 272 int ret;
273
274 mutex_lock(lock);
275
7518dd9a 276 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
0ddc5b89
MJ		 277 if (ret) {
278 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
279 mutex_unlock(lock);
280 return IRQ_NONE;
281 }
282
7518dd9a 283 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
0ddc5b89
MJ		 284 if (ret) {
285 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
286 mutex_unlock(lock);
287 return IRQ_NONE;
288 }
289
290 if (flags & RV3029_IRQ_FLAGS_AF) {
291 flags &= ~RV3029_IRQ_FLAGS_AF;
292 controls &= ~RV3029_IRQ_CTRL_AIE;
293 events |= RTC_AF;
294 }
295
296 if (events) {
297 rtc_update_irq(rv3029->rtc, 1, events);
7518dd9a
AB		 298 regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
299 regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
0ddc5b89
MJ		 300 }
301 mutex_unlock(lock);
302
303 return IRQ_HANDLED;
304}
305
e6e38082 306static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
52365230 307{
7518dd9a 308 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 309 int ret;
aba39d27 310 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
52365230 311
7518dd9a 312 ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
4e7f1a60 313 RV3029_WATCH_SECTION_LEN);
52365230 314 if (ret < 0) {
e6e38082 315 dev_err(dev, "%s: reading RTC section failed\n", __func__);
52365230
HS		 316 return ret;
317 }
318
abe2f551
MJ		 319 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
320 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
52365230
HS		 321
322 /* HR field has a more complex interpretation */
323 {
abe2f551 324 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
aba39d27
MB		 325
326 if (_hr & RV3029_REG_HR_12_24) {
52365230
HS		 327 /* 12h format */
328 tm->tm_hour = bcd2bin(_hr & 0x1f);
aba39d27 329 if (_hr & RV3029_REG_HR_PM) /* PM flag set */
52365230
HS		 330 tm->tm_hour += 12;
331 } else /* 24h format */
332 tm->tm_hour = bcd2bin(_hr & 0x3f);
333 }
334
abe2f551
MJ		 335 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
336 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
337 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
338 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
52365230
HS		 339
340 return 0;
341}
342
e6e38082 343static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
52365230 344{
7518dd9a 345 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 346 struct rtc_time *const tm = &alarm->time;
7518dd9a 347 unsigned int controls, flags;
52365230 348 int ret;
7518dd9a 349 u8 regs[8];
52365230 350
7518dd9a 351 ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 352 RV3029_ALARM_SECTION_LEN);
52365230 353 if (ret < 0) {
e6e38082 354 dev_err(dev, "%s: reading alarm section failed\n", __func__);
52365230
HS		 355 return ret;
356 }
357
7518dd9a 358 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
0ddc5b89
MJ		 359 if (ret) {
360 dev_err(dev, "Read IRQ Control Register error %d\n", ret);
361 return ret;
362 }
7518dd9a 363 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
0ddc5b89
MJ		 364 if (ret < 0) {
365 dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
366 return ret;
367 }
368
abe2f551
MJ		 369 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
370 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
371 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
372 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
373 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
374 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
375 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
52365230 376
0ddc5b89
MJ		 377 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
378 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
379
52365230
HS		 380 return 0;
381}
382
0ddc5b89 383static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
52365230 384{
38ce8e30 385 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 386
38ce8e30
AB		 387 return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,
388 RV3029_IRQ_CTRL_AIE,
389 enable ? RV3029_IRQ_CTRL_AIE : 0);
52365230
HS		 390}
391
e6e38082 392static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
52365230 393{
7518dd9a 394 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230
HS		 395 struct rtc_time *const tm = &alarm->time;
396 int ret;
397 u8 regs[8];
398
399 /*
400 * The clock has an 8 bit wide bcd-coded register (they never learn)
401 * for the year. tm_year is an offset from 1900 and we are interested
402 * in the 2000-2099 range, so any value less than 100 is invalid.
403 */
404 if (tm->tm_year < 100)
405 return -EINVAL;
406
dc492e86
MJ		 407 /* Activate all the alarms with AE_x bit */
408 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
409 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
410 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
411 | RV3029_A_AE_X;
412 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
413 | RV3029_A_AE_X;
414 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
415 | RV3029_A_AE_X;
416 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
417 | RV3029_A_AE_X;
418 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
419 | RV3029_A_AE_X;
420
421 /* Write the alarm */
7518dd9a 422 ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 423 RV3029_ALARM_SECTION_LEN);
52365230
HS		 424 if (ret < 0)
425 return ret;
426
8fd3d609 427 return rv3029_alarm_irq_enable(dev, alarm->enabled);
52365230
HS		 428}
429
e6e38082 430static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
52365230 431{
54c5970d 432 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230
HS		 433 u8 regs[8];
434 int ret;
435
436 /*
437 * The clock has an 8 bit wide bcd-coded register (they never learn)
438 * for the year. tm_year is an offset from 1900 and we are interested
439 * in the 2000-2099 range, so any value less than 100 is invalid.
440 */
441 if (tm->tm_year < 100)
442 return -EINVAL;
443
abe2f551
MJ		 444 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
445 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
446 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
447 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
448 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
38201ca3 449 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
abe2f551 450 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
52365230 451
7518dd9a 452 ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
4e7f1a60 453 RV3029_WATCH_SECTION_LEN);
52365230
HS		 454 if (ret < 0)
455 return ret;
456
52365230 457 /* clear PON bit */
54c5970d
AB		 458 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
459 RV3029_STATUS_PON, 0);
52365230 460}
abe2f551 461
e27e2160
MB		 462static const struct rv3029_trickle_tab_elem {
463 u32 r; /* resistance in ohms */
464 u8 conf; /* trickle config bits */
465} rv3029_trickle_tab[] = {
466 {
467 .r = 1076,
468 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
469 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
470 }, {
471 .r = 1091,
472 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
473 RV3029_TRICKLE_20K,
474 }, {
475 .r = 1137,
476 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
477 RV3029_TRICKLE_80K,
478 }, {
479 .r = 1154,
480 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
481 }, {
482 .r = 1371,
483 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
484 RV3029_TRICKLE_80K,
485 }, {
486 .r = 1395,
487 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
488 }, {
489 .r = 1472,
490 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
491 }, {
492 .r = 1500,
493 .conf = RV3029_TRICKLE_1K,
494 }, {
495 .r = 3810,
496 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
497 RV3029_TRICKLE_80K,
498 }, {
499 .r = 4000,
500 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
501 }, {
502 .r = 4706,
503 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
504 }, {
505 .r = 5000,
506 .conf = RV3029_TRICKLE_5K,
507 }, {
508 .r = 16000,
509 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
510 }, {
511 .r = 20000,
512 .conf = RV3029_TRICKLE_20K,
513 }, {
514 .r = 80000,
515 .conf = RV3029_TRICKLE_80K,
516 },
517};
518
e6e38082 519static void rv3029_trickle_config(struct device *dev)
e27e2160 520{
7518dd9a 521 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
e6e38082 522 struct device_node *of_node = dev->of_node;
e27e2160
MB		 523 const struct rv3029_trickle_tab_elem *elem;
524 int i, err;
525 u32 ohms;
39387dc2 526 u8 trickle_set_bits;
e27e2160
MB		 527
528 if (!of_node)
529 return;
530
531 /* Configure the trickle charger. */
e27e2160
MB		 532 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
533 if (err) {
534 /* Disable trickle charger. */
39387dc2 535 trickle_set_bits = 0;
e27e2160
MB		 536 } else {
537 /* Enable trickle charger. */
538 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
539 elem = &rv3029_trickle_tab[i];
540 if (elem->r >= ohms)
541 break;
542 }
39387dc2 543 trickle_set_bits = elem->conf;
e6e38082 544 dev_info(dev,
e27e2160
MB		 545 "Trickle charger enabled at %d ohms resistance.\n",
546 elem->r);
547 }
7518dd9a 548 err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
39387dc2
MB		 549 RV3029_TRICKLE_MASK,
550 trickle_set_bits);
abe2f551 551 if (err < 0)
e6e38082 552 dev_err(dev, "Failed to update trickle charger config\n");
e27e2160
MB		 553}
554
a696b31e
MB		 555#ifdef CONFIG_RTC_DRV_RV3029_HWMON
556
7518dd9a 557static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
a696b31e 558{
7518dd9a 559 unsigned int temp;
a696b31e 560 int ret;
a696b31e 561
7518dd9a 562 ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
a696b31e
MB		 563 if (ret < 0)
564 return ret;
565
566 *temp_mC = ((int)temp - 60) * 1000;
567
568 return 0;
569}
570
571static ssize_t rv3029_hwmon_show_temp(struct device *dev,
572 struct device_attribute *attr,
573 char *buf)
574{
7518dd9a 575 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 576 int ret, temp_mC;
577
7518dd9a 578 ret = rv3029_read_temp(rv3029, &temp_mC);
a696b31e
MB		 579 if (ret < 0)
580 return ret;
581
582 return sprintf(buf, "%d\n", temp_mC);
583}
584
585static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
586 struct device_attribute *attr,
587 const char *buf,
588 size_t count)
589{
7518dd9a
AB		 590 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
591 unsigned int th_set_bits = 0;
a696b31e
MB		 592 unsigned long interval_ms;
593 int ret;
a696b31e
MB		 594
595 ret = kstrtoul(buf, 10, &interval_ms);
596 if (ret < 0)
597 return ret;
598
599 if (interval_ms != 0) {
600 th_set_bits |= RV3029_EECTRL_THE;
601 if (interval_ms >= 16000)
602 th_set_bits |= RV3029_EECTRL_THP;
603 }
7518dd9a 604 ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 605 RV3029_EECTRL_THE | RV3029_EECTRL_THP,
606 th_set_bits);
607 if (ret < 0)
608 return ret;
609
610 return count;
611}
612
613static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
614 struct device_attribute *attr,
615 char *buf)
616{
7518dd9a 617 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 618 int ret, interval_ms;
619 u8 eectrl;
620
7518dd9a 621 ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 622 &eectrl, 1);
623 if (ret < 0)
624 return ret;
625
626 if (eectrl & RV3029_EECTRL_THE) {
627 if (eectrl & RV3029_EECTRL_THP)
628 interval_ms = 16000;
629 else
630 interval_ms = 1000;
631 } else {
632 interval_ms = 0;
633 }
634
635 return sprintf(buf, "%d\n", interval_ms);
636}
637
638static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
639 NULL, 0);
640static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
641 rv3029_hwmon_show_update_interval,
642 rv3029_hwmon_set_update_interval, 0);
643
644static struct attribute *rv3029_hwmon_attrs[] = {
645 &sensor_dev_attr_temp1_input.dev_attr.attr,
646 &sensor_dev_attr_update_interval.dev_attr.attr,
647 NULL,
648};
649ATTRIBUTE_GROUPS(rv3029_hwmon);
650
e6e38082 651static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e 652{
e6e38082 653 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 654 struct device *hwmon_dev;
655
e6e38082
MJ		 656 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
657 rv3029_hwmon_groups);
a696b31e 658 if (IS_ERR(hwmon_dev)) {
e6e38082 659 dev_warn(dev, "unable to register hwmon device %ld\n",
4e7f1a60 660 PTR_ERR(hwmon_dev));
a696b31e
MB		 661 }
662}
663
664#else /* CONFIG_RTC_DRV_RV3029_HWMON */
665
e6e38082 666static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e
MB		 667{
668}
669
670#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
671
0ddc5b89 672static struct rtc_class_ops rv3029_rtc_ops = {
e6e38082
MJ		 673 .read_time = rv3029_read_time,
674 .set_time = rv3029_set_time,
52365230
HS		 675};
676
e6e38082
MJ		 677static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
678 const char *name)
52365230 679{
e6e38082 680 struct rv3029_data *rv3029;
52365230 681 int rc = 0;
52365230 682
e6e38082
MJ		 683 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
684 if (!rv3029)
685 return -ENOMEM;
686
687 rv3029->regmap = regmap;
688 rv3029->irq = irq;
689 rv3029->dev = dev;
690 dev_set_drvdata(dev, rv3029);
52365230 691
e6e38082
MJ		 692 rv3029_trickle_config(dev);
693 rv3029_hwmon_register(dev, name);
694
695 rv3029->rtc = devm_rtc_device_register(dev, name, &rv3029_rtc_ops,
696 THIS_MODULE);
0ddc5b89
MJ		 697 if (IS_ERR(rv3029->rtc)) {
698 dev_err(dev, "unable to register the class device\n");
699 return PTR_ERR(rv3029->rtc);
700 }
e27e2160 701
0ddc5b89
MJ		 702 if (rv3029->irq > 0) {
703 rc = devm_request_threaded_irq(dev, rv3029->irq,
704 NULL, rv3029_handle_irq,
705 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
706 "rv3029", dev);
707 if (rc) {
708 dev_warn(dev, "unable to request IRQ, alarms disabled\n");
709 rv3029->irq = 0;
710 } else {
711 rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
712 rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
713 rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
714 }
715 }
716
717 return 0;
e6e38082 718}
52365230 719
c509e434
AB		 720static const struct regmap_range rv3029_holes_range[] = {
721 regmap_reg_range(0x05, 0x07),
722 regmap_reg_range(0x0f, 0x0f),
723 regmap_reg_range(0x17, 0x17),
724 regmap_reg_range(0x1a, 0x1f),
725 regmap_reg_range(0x21, 0x27),
726 regmap_reg_range(0x34, 0x37),
727};
728
729static const struct regmap_access_table rv3029_regs = {
730 .no_ranges = rv3029_holes_range,
731 .n_no_ranges = ARRAY_SIZE(rv3029_holes_range),
732};
733
734static const struct regmap_config config = {
735 .reg_bits = 8,
736 .val_bits = 8,
737 .rd_table = &rv3029_regs,
738 .wr_table = &rv3029_regs,
739 .max_register = 0x3f,
740};
741
c2a1c145
MJ		 742#if IS_ENABLED(CONFIG_I2C)
743
e6e38082
MJ		 744static int rv3029_i2c_probe(struct i2c_client *client,
745 const struct i2c_device_id *id)
746{
747 struct regmap *regmap;
e6e38082
MJ		 748 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
749 I2C_FUNC_SMBUS_BYTE)) {
750 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
751 return -ENODEV;
752 }
52365230 753
e6e38082
MJ		 754 regmap = devm_regmap_init_i2c(client, &config);
755 if (IS_ERR(regmap)) {
756 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
757 __func__, PTR_ERR(regmap));
758 return PTR_ERR(regmap);
759 }
52365230 760
e6e38082 761 return rv3029_probe(&client->dev, regmap, client->irq, client->name);
52365230
HS		 762}
763
45a63518 764static const struct i2c_device_id rv3029_id[] = {
814db2bc
AB		 765 { "rv3029", 0 },
766 { "rv3029c2", 0 },
767 { }
768};
769MODULE_DEVICE_TABLE(i2c, rv3029_id);
770
e696a1dd 771static const struct of_device_id rv3029_of_match[] = {
45b611c8
AB		 772 { .compatible = "microcrystal,rv3029" },
773 /* Backward compatibility only, do not use compatibles below: */
e696a1dd
JMC		 774 { .compatible = "rv3029" },
775 { .compatible = "rv3029c2" },
776 { .compatible = "mc,rv3029c2" },
777 { }
778};
779MODULE_DEVICE_TABLE(of, rv3029_of_match);
780
aba39d27 781static struct i2c_driver rv3029_driver = {
52365230 782 .driver = {
9b45ef97 783 .name = "rv3029",
e696a1dd 784 .of_match_table = of_match_ptr(rv3029_of_match),
52365230 785 },
e6e38082 786 .probe = rv3029_i2c_probe,
aba39d27 787 .id_table = rv3029_id,
52365230
HS		 788};
789
c2a1c145
MJ		 790static int rv3029_register_driver(void)
791{
792 return i2c_add_driver(&rv3029_driver);
793}
794
795static void rv3029_unregister_driver(void)
796{
797 i2c_del_driver(&rv3029_driver);
798}
799
800#else
801
802static int rv3029_register_driver(void)
803{
804 return 0;
805}
806
807static void rv3029_unregister_driver(void)
808{
809}
810
811#endif
812
813#if IS_ENABLED(CONFIG_SPI_MASTER)
814
815static int rv3049_probe(struct spi_device *spi)
816{
c2a1c145
MJ		 817 struct regmap *regmap;
818
819 regmap = devm_regmap_init_spi(spi, &config);
820 if (IS_ERR(regmap)) {
821 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
822 __func__, PTR_ERR(regmap));
823 return PTR_ERR(regmap);
824 }
825
826 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
827}
828
829static struct spi_driver rv3049_driver = {
830 .driver = {
831 .name = "rv3049",
832 },
833 .probe = rv3049_probe,
834};
835
836static int rv3049_register_driver(void)
837{
838 return spi_register_driver(&rv3049_driver);
839}
840
841static void rv3049_unregister_driver(void)
842{
843 spi_unregister_driver(&rv3049_driver);
844}
845
846#else
847
848static int rv3049_register_driver(void)
849{
850 return 0;
851}
852
853static void rv3049_unregister_driver(void)
854{
855}
856
857#endif
858
859static int __init rv30x9_init(void)
860{
861 int ret;
862
863 ret = rv3029_register_driver();
864 if (ret) {
865 pr_err("Failed to register rv3029 driver: %d\n", ret);
866 return ret;
867 }
868
869 ret = rv3049_register_driver();
870 if (ret) {
871 pr_err("Failed to register rv3049 driver: %d\n", ret);
872 rv3029_unregister_driver();
873 }
874
875 return ret;
876}
877module_init(rv30x9_init)
878
879static void __exit rv30x9_exit(void)
880{
881 rv3049_unregister_driver();
882 rv3029_unregister_driver();
883}
884module_exit(rv30x9_exit)
52365230
HS		 885
886MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
2dca3d9e 887MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
c2a1c145 888MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
52365230 889MODULE_LICENSE("GPL");
c2a1c145 890MODULE_ALIAS("spi:rv3049");
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