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rtc: rv3029: drop deprecated compatbiles
[linux-block.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 */
ec923fcc
AB		 112#define RV3029_RAM_PAGE 0x38
113#define RV3029_RAM_SECTION_LEN 8
52365230 114
e6e38082
MJ		 115struct rv3029_data {
116 struct device *dev;
117 struct rtc_device *rtc;
118 struct regmap *regmap;
119 int irq;
120};
121
bb72dbba 122static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
a7f6e287 123{
bb72dbba 124 unsigned int sr;
a7f6e287 125 int i, ret;
a7f6e287
MB		 126
127 for (i = 100; i > 0; i--) {
bb72dbba 128 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 129 if (ret < 0)
130 break;
131 if (!(sr & RV3029_STATUS_EEBUSY))
132 break;
133 usleep_range(1000, 10000);
134 }
135 if (i <= 0) {
bb72dbba 136 dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
a7f6e287
MB		 137 return -ETIMEDOUT;
138 }
139
140 return ret;
141}
142
7518dd9a 143static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
a7f6e287
MB		 144{
145 /* Re-enable eeprom refresh */
609e97fe 146 return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
4e7f1a60
MJ		 147 RV3029_ONOFF_CTRL_EERE,
148 RV3029_ONOFF_CTRL_EERE);
a7f6e287
MB		 149}
150
7518dd9a 151static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
a7f6e287 152{
bb72dbba 153 unsigned int sr;
a7f6e287 154 int ret;
a7f6e287
MB		 155
156 /* Check whether we are in the allowed voltage range. */
bb72dbba 157 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 158 if (ret < 0)
159 return ret;
cff2e4d2
AB		 160 if (sr & RV3029_STATUS_VLOW2)
161 return -ENODEV;
162 if (sr & RV3029_STATUS_VLOW1) {
a7f6e287
MB		 163 /* We clear the bits and retry once just in case
164 * we had a brown out in early startup.
165 */
54c5970d 166 ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
cff2e4d2 167 RV3029_STATUS_VLOW1, 0);
a7f6e287
MB		 168 if (ret < 0)
169 return ret;
170 usleep_range(1000, 10000);
bb72dbba 171 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 172 if (ret < 0)
173 return ret;
cff2e4d2 174 if (sr & RV3029_STATUS_VLOW1) {
7518dd9a 175 dev_err(rv3029->dev,
a7f6e287
MB		 176 "Supply voltage is too low to safely access the EEPROM.\n");
177 return -ENODEV;
178 }
179 }
180
181 /* Disable eeprom refresh. */
609e97fe
AB		 182 ret = regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
183 RV3029_ONOFF_CTRL_EERE, 0);
a7f6e287
MB		 184 if (ret < 0)
185 return ret;
186
187 /* Wait for any previous eeprom accesses to finish. */
bb72dbba 188 ret = rv3029_eeprom_busywait(rv3029);
a7f6e287 189 if (ret < 0)
7518dd9a 190 rv3029_eeprom_exit(rv3029);
a7f6e287
MB		 191
192 return ret;
193}
194
7518dd9a 195static int rv3029_eeprom_read(struct rv3029_data *rv3029, u8 reg,
a7f6e287
MB		 196 u8 buf[], size_t len)
197{
198 int ret, err;
199
7518dd9a 200 err = rv3029_eeprom_enter(rv3029);
a7f6e287
MB		 201 if (err < 0)
202 return err;
203
7518dd9a 204 ret = regmap_bulk_read(rv3029->regmap, reg, buf, len);
a7f6e287 205
7518dd9a 206 err = rv3029_eeprom_exit(rv3029);
a7f6e287
MB		 207 if (err < 0)
208 return err;
209
210 return ret;
211}
212
7518dd9a 213static int rv3029_eeprom_write(struct rv3029_data *rv3029, u8 reg,
a7f6e287
MB		 214 u8 const buf[], size_t len)
215{
7518dd9a 216 unsigned int tmp;
a6f26606 217 int ret, err;
a7f6e287 218 size_t i;
a7f6e287 219
7518dd9a 220 err = rv3029_eeprom_enter(rv3029);
a6f26606
DC		 221 if (err < 0)
222 return err;
a7f6e287
MB		 223
224 for (i = 0; i < len; i++, reg++) {
7518dd9a 225 ret = regmap_read(rv3029->regmap, reg, &tmp);
a7f6e287
MB		 226 if (ret < 0)
227 break;
228 if (tmp != buf[i]) {
7518dd9a
AB		 229 tmp = buf[i];
230 ret = regmap_write(rv3029->regmap, reg, tmp);
a7f6e287
MB		 231 if (ret < 0)
232 break;
233 }
bb72dbba 234 ret = rv3029_eeprom_busywait(rv3029);
a7f6e287
MB		 235 if (ret < 0)
236 break;
237 }
238
7518dd9a 239 err = rv3029_eeprom_exit(rv3029);
a6f26606
DC		 240 if (err < 0)
241 return err;
a7f6e287 242
a6f26606 243 return ret;
a7f6e287
MB		 244}
245
7518dd9a 246static int rv3029_eeprom_update_bits(struct rv3029_data *rv3029,
39387dc2
MB		 247 u8 reg, u8 mask, u8 set)
248{
249 u8 buf;
250 int ret;
251
7518dd9a 252 ret = rv3029_eeprom_read(rv3029, reg, &buf, 1);
39387dc2
MB		 253 if (ret < 0)
254 return ret;
255 buf &= ~mask;
256 buf |= set & mask;
7518dd9a 257 ret = rv3029_eeprom_write(rv3029, reg, &buf, 1);
39387dc2
MB		 258 if (ret < 0)
259 return ret;
260
261 return 0;
262}
263
0ddc5b89
MJ		 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 struct mutex *lock = &rv3029->rtc->ops_lock;
7518dd9a 269 unsigned int flags, controls;
0ddc5b89 270 unsigned long events = 0;
0ddc5b89
MJ		 271 int ret;
272
273 mutex_lock(lock);
274
7518dd9a 275 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
0ddc5b89
MJ		 276 if (ret) {
277 dev_warn(dev, "Read IRQ Control Register error %d\n", ret);
278 mutex_unlock(lock);
279 return IRQ_NONE;
280 }
281
7518dd9a 282 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
0ddc5b89
MJ		 283 if (ret) {
284 dev_warn(dev, "Read IRQ Flags Register error %d\n", ret);
285 mutex_unlock(lock);
286 return IRQ_NONE;
287 }
288
289 if (flags & RV3029_IRQ_FLAGS_AF) {
290 flags &= ~RV3029_IRQ_FLAGS_AF;
291 controls &= ~RV3029_IRQ_CTRL_AIE;
292 events |= RTC_AF;
293 }
294
295 if (events) {
296 rtc_update_irq(rv3029->rtc, 1, events);
7518dd9a
AB		 297 regmap_write(rv3029->regmap, RV3029_IRQ_FLAGS, flags);
298 regmap_write(rv3029->regmap, RV3029_IRQ_CTRL, controls);
0ddc5b89
MJ		 299 }
300 mutex_unlock(lock);
301
302 return IRQ_HANDLED;
303}
304
e6e38082 305static int rv3029_read_time(struct device *dev, struct rtc_time *tm)
52365230 306{
7518dd9a 307 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
cff2e4d2 308 unsigned int sr;
52365230 309 int ret;
aba39d27 310 u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, };
52365230 311
cff2e4d2
AB		 312 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
313 if (ret < 0)
314 return ret;
315
316 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
317 return -EINVAL;
318
7518dd9a 319 ret = regmap_bulk_read(rv3029->regmap, RV3029_W_SEC, regs,
4e7f1a60 320 RV3029_WATCH_SECTION_LEN);
52365230 321 if (ret < 0) {
e6e38082 322 dev_err(dev, "%s: reading RTC section failed\n", __func__);
52365230
HS		 323 return ret;
324 }
325
abe2f551
MJ		 326 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
327 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
52365230
HS		 328
329 /* HR field has a more complex interpretation */
330 {
abe2f551 331 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
aba39d27
MB		 332
333 if (_hr & RV3029_REG_HR_12_24) {
52365230
HS		 334 /* 12h format */
335 tm->tm_hour = bcd2bin(_hr & 0x1f);
aba39d27 336 if (_hr & RV3029_REG_HR_PM) /* PM flag set */
52365230
HS		 337 tm->tm_hour += 12;
338 } else /* 24h format */
339 tm->tm_hour = bcd2bin(_hr & 0x3f);
340 }
341
abe2f551
MJ		 342 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
343 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
344 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
345 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
52365230
HS		 346
347 return 0;
348}
349
e6e38082 350static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
52365230 351{
7518dd9a 352 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 353 struct rtc_time *const tm = &alarm->time;
7518dd9a 354 unsigned int controls, flags;
52365230 355 int ret;
7518dd9a 356 u8 regs[8];
52365230 357
7518dd9a 358 ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 359 RV3029_ALARM_SECTION_LEN);
52365230 360 if (ret < 0) {
e6e38082 361 dev_err(dev, "%s: reading alarm section failed\n", __func__);
52365230
HS		 362 return ret;
363 }
364
7518dd9a 365 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
0ddc5b89
MJ		 366 if (ret) {
367 dev_err(dev, "Read IRQ Control Register error %d\n", ret);
368 return ret;
369 }
7518dd9a 370 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
0ddc5b89
MJ		 371 if (ret < 0) {
372 dev_err(dev, "Read IRQ Flags Register error %d\n", ret);
373 return ret;
374 }
375
abe2f551
MJ		 376 tm->tm_sec = bcd2bin(regs[RV3029_A_SC - RV3029_A_SC] & 0x7f);
377 tm->tm_min = bcd2bin(regs[RV3029_A_MN - RV3029_A_SC] & 0x7f);
378 tm->tm_hour = bcd2bin(regs[RV3029_A_HR - RV3029_A_SC] & 0x3f);
379 tm->tm_mday = bcd2bin(regs[RV3029_A_DT - RV3029_A_SC] & 0x3f);
380 tm->tm_mon = bcd2bin(regs[RV3029_A_MO - RV3029_A_SC] & 0x1f) - 1;
381 tm->tm_year = bcd2bin(regs[RV3029_A_YR - RV3029_A_SC] & 0x7f) + 100;
382 tm->tm_wday = bcd2bin(regs[RV3029_A_DW - RV3029_A_SC] & 0x07) - 1;
52365230 383
0ddc5b89
MJ		 384 alarm->enabled = !!(controls & RV3029_IRQ_CTRL_AIE);
385 alarm->pending = (flags & RV3029_IRQ_FLAGS_AF) && alarm->enabled;
386
52365230
HS		 387 return 0;
388}
389
0ddc5b89 390static int rv3029_alarm_irq_enable(struct device *dev, unsigned int enable)
52365230 391{
38ce8e30 392 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 393
38ce8e30
AB		 394 return regmap_update_bits(rv3029->regmap, RV3029_IRQ_CTRL,
395 RV3029_IRQ_CTRL_AIE,
396 enable ? RV3029_IRQ_CTRL_AIE : 0);
52365230
HS		 397}
398
e6e38082 399static int rv3029_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
52365230 400{
7518dd9a 401 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230
HS		 402 struct rtc_time *const tm = &alarm->time;
403 int ret;
404 u8 regs[8];
405
dc492e86
MJ		 406 /* Activate all the alarms with AE_x bit */
407 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
408 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
409 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
410 | RV3029_A_AE_X;
411 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
412 | RV3029_A_AE_X;
413 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
414 | RV3029_A_AE_X;
415 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
416 | RV3029_A_AE_X;
417 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
418 | RV3029_A_AE_X;
419
420 /* Write the alarm */
7518dd9a 421 ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 422 RV3029_ALARM_SECTION_LEN);
52365230
HS		 423 if (ret < 0)
424 return ret;
425
8fd3d609 426 return rv3029_alarm_irq_enable(dev, alarm->enabled);
52365230
HS		 427}
428
e6e38082 429static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
52365230 430{
54c5970d 431 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230
HS		 432 u8 regs[8];
433 int ret;
434
abe2f551
MJ		 435 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
436 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
437 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
438 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
439 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
38201ca3 440 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
abe2f551 441 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
52365230 442
7518dd9a 443 ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
4e7f1a60 444 RV3029_WATCH_SECTION_LEN);
52365230
HS		 445 if (ret < 0)
446 return ret;
447
cff2e4d2 448 /* clear PON and VLOW2 bits */
54c5970d 449 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
cff2e4d2 450 RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0);
52365230 451}
abe2f551 452
f630f728
AB		 453static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
454{
455 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
456 unsigned long vl = 0;
457 int sr, ret = 0;
458
459 switch (cmd) {
460 case RTC_VL_READ:
461 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
462 if (ret < 0)
463 return ret;
464
465 if (sr & RV3029_STATUS_VLOW1)
466 vl = RTC_VL_ACCURACY_LOW;
467
468 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
469 vl |= RTC_VL_DATA_INVALID;
470
471 return put_user(vl, (unsigned int __user *)arg);
472
473 case RTC_VL_CLR:
474 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
475 RV3029_STATUS_VLOW1, 0);
476
477 default:
478 return -ENOIOCTLCMD;
479 }
480}
481
ec923fcc
AB		 482static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
483 size_t bytes)
484{
485 return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
486}
487
488static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
489 size_t bytes)
490{
491 return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
492}
493
e27e2160
MB		 494static const struct rv3029_trickle_tab_elem {
495 u32 r; /* resistance in ohms */
496 u8 conf; /* trickle config bits */
497} rv3029_trickle_tab[] = {
498 {
499 .r = 1076,
500 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
501 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
502 }, {
503 .r = 1091,
504 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
505 RV3029_TRICKLE_20K,
506 }, {
507 .r = 1137,
508 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
509 RV3029_TRICKLE_80K,
510 }, {
511 .r = 1154,
512 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
513 }, {
514 .r = 1371,
515 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
516 RV3029_TRICKLE_80K,
517 }, {
518 .r = 1395,
519 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
520 }, {
521 .r = 1472,
522 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
523 }, {
524 .r = 1500,
525 .conf = RV3029_TRICKLE_1K,
526 }, {
527 .r = 3810,
528 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
529 RV3029_TRICKLE_80K,
530 }, {
531 .r = 4000,
532 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
533 }, {
534 .r = 4706,
535 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
536 }, {
537 .r = 5000,
538 .conf = RV3029_TRICKLE_5K,
539 }, {
540 .r = 16000,
541 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
542 }, {
543 .r = 20000,
544 .conf = RV3029_TRICKLE_20K,
545 }, {
546 .r = 80000,
547 .conf = RV3029_TRICKLE_80K,
548 },
549};
550
e6e38082 551static void rv3029_trickle_config(struct device *dev)
e27e2160 552{
7518dd9a 553 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
e6e38082 554 struct device_node *of_node = dev->of_node;
e27e2160
MB		 555 const struct rv3029_trickle_tab_elem *elem;
556 int i, err;
557 u32 ohms;
39387dc2 558 u8 trickle_set_bits;
e27e2160
MB		 559
560 if (!of_node)
561 return;
562
563 /* Configure the trickle charger. */
e27e2160
MB		 564 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
565 if (err) {
566 /* Disable trickle charger. */
39387dc2 567 trickle_set_bits = 0;
e27e2160
MB		 568 } else {
569 /* Enable trickle charger. */
570 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
571 elem = &rv3029_trickle_tab[i];
572 if (elem->r >= ohms)
573 break;
574 }
39387dc2 575 trickle_set_bits = elem->conf;
e6e38082 576 dev_info(dev,
e27e2160
MB		 577 "Trickle charger enabled at %d ohms resistance.\n",
578 elem->r);
579 }
7518dd9a 580 err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
39387dc2
MB		 581 RV3029_TRICKLE_MASK,
582 trickle_set_bits);
abe2f551 583 if (err < 0)
e6e38082 584 dev_err(dev, "Failed to update trickle charger config\n");
e27e2160
MB		 585}
586
a696b31e
MB		 587#ifdef CONFIG_RTC_DRV_RV3029_HWMON
588
7518dd9a 589static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
a696b31e 590{
7518dd9a 591 unsigned int temp;
a696b31e 592 int ret;
a696b31e 593
7518dd9a 594 ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
a696b31e
MB		 595 if (ret < 0)
596 return ret;
597
598 *temp_mC = ((int)temp - 60) * 1000;
599
600 return 0;
601}
602
603static ssize_t rv3029_hwmon_show_temp(struct device *dev,
604 struct device_attribute *attr,
605 char *buf)
606{
7518dd9a 607 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 608 int ret, temp_mC;
609
7518dd9a 610 ret = rv3029_read_temp(rv3029, &temp_mC);
a696b31e
MB		 611 if (ret < 0)
612 return ret;
613
614 return sprintf(buf, "%d\n", temp_mC);
615}
616
617static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
618 struct device_attribute *attr,
619 const char *buf,
620 size_t count)
621{
7518dd9a
AB		 622 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
623 unsigned int th_set_bits = 0;
a696b31e
MB		 624 unsigned long interval_ms;
625 int ret;
a696b31e
MB		 626
627 ret = kstrtoul(buf, 10, &interval_ms);
628 if (ret < 0)
629 return ret;
630
631 if (interval_ms != 0) {
632 th_set_bits |= RV3029_EECTRL_THE;
633 if (interval_ms >= 16000)
634 th_set_bits |= RV3029_EECTRL_THP;
635 }
7518dd9a 636 ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 637 RV3029_EECTRL_THE | RV3029_EECTRL_THP,
638 th_set_bits);
639 if (ret < 0)
640 return ret;
641
642 return count;
643}
644
645static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
646 struct device_attribute *attr,
647 char *buf)
648{
7518dd9a 649 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 650 int ret, interval_ms;
651 u8 eectrl;
652
7518dd9a 653 ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 654 &eectrl, 1);
655 if (ret < 0)
656 return ret;
657
658 if (eectrl & RV3029_EECTRL_THE) {
659 if (eectrl & RV3029_EECTRL_THP)
660 interval_ms = 16000;
661 else
662 interval_ms = 1000;
663 } else {
664 interval_ms = 0;
665 }
666
667 return sprintf(buf, "%d\n", interval_ms);
668}
669
670static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
671 NULL, 0);
672static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
673 rv3029_hwmon_show_update_interval,
674 rv3029_hwmon_set_update_interval, 0);
675
676static struct attribute *rv3029_hwmon_attrs[] = {
677 &sensor_dev_attr_temp1_input.dev_attr.attr,
678 &sensor_dev_attr_update_interval.dev_attr.attr,
679 NULL,
680};
681ATTRIBUTE_GROUPS(rv3029_hwmon);
682
e6e38082 683static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e 684{
e6e38082 685 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 686 struct device *hwmon_dev;
687
e6e38082
MJ		 688 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
689 rv3029_hwmon_groups);
a696b31e 690 if (IS_ERR(hwmon_dev)) {
e6e38082 691 dev_warn(dev, "unable to register hwmon device %ld\n",
4e7f1a60 692 PTR_ERR(hwmon_dev));
a696b31e
MB		 693 }
694}
695
696#else /* CONFIG_RTC_DRV_RV3029_HWMON */
697
e6e38082 698static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e
MB		 699{
700}
701
702#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
703
0ddc5b89 704static struct rtc_class_ops rv3029_rtc_ops = {
e6e38082
MJ		 705 .read_time = rv3029_read_time,
706 .set_time = rv3029_set_time,
f630f728 707 .ioctl = rv3029_ioctl,
52365230
HS		 708};
709
e6e38082
MJ		 710static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
711 const char *name)
52365230 712{
e6e38082 713 struct rv3029_data *rv3029;
ec923fcc
AB		 714 struct nvmem_config nvmem_cfg = {
715 .name = "rv3029_nvram",
716 .word_size = 1,
717 .stride = 1,
718 .size = RV3029_RAM_SECTION_LEN,
719 .type = NVMEM_TYPE_BATTERY_BACKED,
720 .reg_read = rv3029_nvram_read,
721 .reg_write = rv3029_nvram_write,
722 };
52365230 723 int rc = 0;
52365230 724
e6e38082
MJ		 725 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
726 if (!rv3029)
727 return -ENOMEM;
728
729 rv3029->regmap = regmap;
730 rv3029->irq = irq;
731 rv3029->dev = dev;
732 dev_set_drvdata(dev, rv3029);
52365230 733
e6e38082
MJ		 734 rv3029_trickle_config(dev);
735 rv3029_hwmon_register(dev, name);
736
9346f870
AB		 737 rv3029->rtc = devm_rtc_allocate_device(dev);
738 if (IS_ERR(rv3029->rtc))
0ddc5b89 739 return PTR_ERR(rv3029->rtc);
e27e2160 740
0ddc5b89
MJ		 741 if (rv3029->irq > 0) {
742 rc = devm_request_threaded_irq(dev, rv3029->irq,
743 NULL, rv3029_handle_irq,
744 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
745 "rv3029", dev);
746 if (rc) {
747 dev_warn(dev, "unable to request IRQ, alarms disabled\n");
748 rv3029->irq = 0;
749 } else {
750 rv3029_rtc_ops.read_alarm = rv3029_read_alarm;
751 rv3029_rtc_ops.set_alarm = rv3029_set_alarm;
752 rv3029_rtc_ops.alarm_irq_enable = rv3029_alarm_irq_enable;
753 }
754 }
755
9346f870 756 rv3029->rtc->ops = &rv3029_rtc_ops;
cbc943eb
AB		 757 rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
758 rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
9346f870 759
ec923fcc
AB		 760 rc = rtc_register_device(rv3029->rtc);
761 if (rc)
762 return rc;
763
764 nvmem_cfg.priv = rv3029->regmap;
765 rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);
766
767 return 0;
e6e38082 768}
52365230 769
c509e434
AB		 770static const struct regmap_range rv3029_holes_range[] = {
771 regmap_reg_range(0x05, 0x07),
772 regmap_reg_range(0x0f, 0x0f),
773 regmap_reg_range(0x17, 0x17),
774 regmap_reg_range(0x1a, 0x1f),
775 regmap_reg_range(0x21, 0x27),
776 regmap_reg_range(0x34, 0x37),
777};
778
779static const struct regmap_access_table rv3029_regs = {
780 .no_ranges = rv3029_holes_range,
781 .n_no_ranges = ARRAY_SIZE(rv3029_holes_range),
782};
783
784static const struct regmap_config config = {
785 .reg_bits = 8,
786 .val_bits = 8,
787 .rd_table = &rv3029_regs,
788 .wr_table = &rv3029_regs,
789 .max_register = 0x3f,
790};
791
c2a1c145
MJ		 792#if IS_ENABLED(CONFIG_I2C)
793
e6e38082
MJ		 794static int rv3029_i2c_probe(struct i2c_client *client,
795 const struct i2c_device_id *id)
796{
797 struct regmap *regmap;
e6e38082
MJ		 798 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
799 I2C_FUNC_SMBUS_BYTE)) {
800 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
801 return -ENODEV;
802 }
52365230 803
e6e38082
MJ		 804 regmap = devm_regmap_init_i2c(client, &config);
805 if (IS_ERR(regmap)) {
806 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
807 __func__, PTR_ERR(regmap));
808 return PTR_ERR(regmap);
809 }
52365230 810
e6e38082 811 return rv3029_probe(&client->dev, regmap, client->irq, client->name);
52365230
HS		 812}
813
45a63518 814static const struct i2c_device_id rv3029_id[] = {
814db2bc
AB		 815 { "rv3029", 0 },
816 { "rv3029c2", 0 },
817 { }
818};
819MODULE_DEVICE_TABLE(i2c, rv3029_id);
820
e696a1dd 821static const struct of_device_id rv3029_of_match[] = {
45b611c8 822 { .compatible = "microcrystal,rv3029" },
e696a1dd
JMC		 823 { }
824};
825MODULE_DEVICE_TABLE(of, rv3029_of_match);
826
aba39d27 827static struct i2c_driver rv3029_driver = {
52365230 828 .driver = {
9b45ef97 829 .name = "rv3029",
e696a1dd 830 .of_match_table = of_match_ptr(rv3029_of_match),
52365230 831 },
e6e38082 832 .probe = rv3029_i2c_probe,
aba39d27 833 .id_table = rv3029_id,
52365230
HS		 834};
835
c2a1c145
MJ		 836static int rv3029_register_driver(void)
837{
838 return i2c_add_driver(&rv3029_driver);
839}
840
841static void rv3029_unregister_driver(void)
842{
843 i2c_del_driver(&rv3029_driver);
844}
845
846#else
847
848static int rv3029_register_driver(void)
849{
850 return 0;
851}
852
853static void rv3029_unregister_driver(void)
854{
855}
856
857#endif
858
859#if IS_ENABLED(CONFIG_SPI_MASTER)
860
861static int rv3049_probe(struct spi_device *spi)
862{
c2a1c145
MJ		 863 struct regmap *regmap;
864
865 regmap = devm_regmap_init_spi(spi, &config);
866 if (IS_ERR(regmap)) {
867 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
868 __func__, PTR_ERR(regmap));
869 return PTR_ERR(regmap);
870 }
871
872 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
873}
874
875static struct spi_driver rv3049_driver = {
876 .driver = {
877 .name = "rv3049",
878 },
879 .probe = rv3049_probe,
880};
881
882static int rv3049_register_driver(void)
883{
884 return spi_register_driver(&rv3049_driver);
885}
886
887static void rv3049_unregister_driver(void)
888{
889 spi_unregister_driver(&rv3049_driver);
890}
891
892#else
893
894static int rv3049_register_driver(void)
895{
896 return 0;
897}
898
899static void rv3049_unregister_driver(void)
900{
901}
902
903#endif
904
905static int __init rv30x9_init(void)
906{
907 int ret;
908
909 ret = rv3029_register_driver();
910 if (ret) {
911 pr_err("Failed to register rv3029 driver: %d\n", ret);
912 return ret;
913 }
914
915 ret = rv3049_register_driver();
916 if (ret) {
917 pr_err("Failed to register rv3049 driver: %d\n", ret);
918 rv3029_unregister_driver();
919 }
920
921 return ret;
922}
923module_init(rv30x9_init)
924
925static void __exit rv30x9_exit(void)
926{
927 rv3049_unregister_driver();
928 rv3029_unregister_driver();
929}
930module_exit(rv30x9_exit)
52365230
HS		 931
932MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
2dca3d9e 933MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
c2a1c145 934MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
52365230 935MODULE_LICENSE("GPL");
c2a1c145 936MODULE_ALIAS("spi:rv3049");
Linux 6.x block layer and io_uring tree(s)