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fbdev: imsttfb: Fix use after free bug in imsttfb_probe
[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>
e59b3c73 20#include <linux/kstrtox.h>
e6e38082 21#include <linux/regmap.h>
52365230
HS		 22
23/* Register map */
24/* control section */
aba39d27 25#define RV3029_ONOFF_CTRL 0x00
7697de35
MB		 26#define RV3029_ONOFF_CTRL_WE BIT(0)
27#define RV3029_ONOFF_CTRL_TE BIT(1)
28#define RV3029_ONOFF_CTRL_TAR BIT(2)
29#define RV3029_ONOFF_CTRL_EERE BIT(3)
30#define RV3029_ONOFF_CTRL_SRON BIT(4)
31#define RV3029_ONOFF_CTRL_TD0 BIT(5)
32#define RV3029_ONOFF_CTRL_TD1 BIT(6)
33#define RV3029_ONOFF_CTRL_CLKINT BIT(7)
aba39d27 34#define RV3029_IRQ_CTRL 0x01
7697de35
MB		 35#define RV3029_IRQ_CTRL_AIE BIT(0)
36#define RV3029_IRQ_CTRL_TIE BIT(1)
37#define RV3029_IRQ_CTRL_V1IE BIT(2)
38#define RV3029_IRQ_CTRL_V2IE BIT(3)
39#define RV3029_IRQ_CTRL_SRIE BIT(4)
aba39d27 40#define RV3029_IRQ_FLAGS 0x02
7697de35
MB		 41#define RV3029_IRQ_FLAGS_AF BIT(0)
42#define RV3029_IRQ_FLAGS_TF BIT(1)
43#define RV3029_IRQ_FLAGS_V1IF BIT(2)
44#define RV3029_IRQ_FLAGS_V2IF BIT(3)
45#define RV3029_IRQ_FLAGS_SRF BIT(4)
aba39d27 46#define RV3029_STATUS 0x03
7697de35
MB		 47#define RV3029_STATUS_VLOW1 BIT(2)
48#define RV3029_STATUS_VLOW2 BIT(3)
49#define RV3029_STATUS_SR BIT(4)
50#define RV3029_STATUS_PON BIT(5)
51#define RV3029_STATUS_EEBUSY BIT(7)
aba39d27 52#define RV3029_RST_CTRL 0x04
7697de35 53#define RV3029_RST_CTRL_SYSR BIT(4)
aba39d27 54#define RV3029_CONTROL_SECTION_LEN 0x05
52365230
HS		 55
56/* watch section */
aba39d27
MB		 57#define RV3029_W_SEC 0x08
58#define RV3029_W_MINUTES 0x09
59#define RV3029_W_HOURS 0x0A
7697de35
MB		 60#define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */
61#define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */
aba39d27
MB		 62#define RV3029_W_DATE 0x0B
63#define RV3029_W_DAYS 0x0C
64#define RV3029_W_MONTHS 0x0D
65#define RV3029_W_YEARS 0x0E
66#define RV3029_WATCH_SECTION_LEN 0x07
52365230
HS		 67
68/* alarm section */
aba39d27
MB		 69#define RV3029_A_SC 0x10
70#define RV3029_A_MN 0x11
71#define RV3029_A_HR 0x12
72#define RV3029_A_DT 0x13
73#define RV3029_A_DW 0x14
74#define RV3029_A_MO 0x15
75#define RV3029_A_YR 0x16
dc492e86 76#define RV3029_A_AE_X BIT(7)
aba39d27 77#define RV3029_ALARM_SECTION_LEN 0x07
52365230
HS		 78
79/* timer section */
aba39d27
MB		 80#define RV3029_TIMER_LOW 0x18
81#define RV3029_TIMER_HIGH 0x19
52365230
HS		 82
83/* temperature section */
aba39d27 84#define RV3029_TEMP_PAGE 0x20
52365230
HS		 85
86/* eeprom data section */
aba39d27
MB		 87#define RV3029_E2P_EEDATA1 0x28
88#define RV3029_E2P_EEDATA2 0x29
7697de35 89#define RV3029_E2PDATA_SECTION_LEN 0x02
52365230
HS		 90
91/* eeprom control section */
aba39d27 92#define RV3029_CONTROL_E2P_EECTRL 0x30
7697de35
MB		 93#define RV3029_EECTRL_THP BIT(0) /* temp scan interval */
94#define RV3029_EECTRL_THE BIT(1) /* thermometer enable */
95#define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */
96#define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */
97#define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */
98#define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */
99#define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */
100#define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */
101#define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\
102 RV3029_TRICKLE_5K |\
103 RV3029_TRICKLE_20K |\
104 RV3029_TRICKLE_80K)
105#define RV3029_TRICKLE_SHIFT 4
106#define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */
107#define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */
108#define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */
109#define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */
110#define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */
52365230
HS		 111
112/* user ram section */
ec923fcc
AB		 113#define RV3029_RAM_PAGE 0x38
114#define RV3029_RAM_SECTION_LEN 8
52365230 115
e6e38082
MJ		 116struct rv3029_data {
117 struct device *dev;
118 struct rtc_device *rtc;
119 struct regmap *regmap;
120 int irq;
121};
122
bb72dbba 123static int rv3029_eeprom_busywait(struct rv3029_data *rv3029)
a7f6e287 124{
bb72dbba 125 unsigned int sr;
a7f6e287 126 int i, ret;
a7f6e287
MB		 127
128 for (i = 100; i > 0; i--) {
bb72dbba 129 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 130 if (ret < 0)
131 break;
132 if (!(sr & RV3029_STATUS_EEBUSY))
133 break;
134 usleep_range(1000, 10000);
135 }
136 if (i <= 0) {
bb72dbba 137 dev_err(rv3029->dev, "EEPROM busy wait timeout.\n");
a7f6e287
MB		 138 return -ETIMEDOUT;
139 }
140
141 return ret;
142}
143
7518dd9a 144static int rv3029_eeprom_exit(struct rv3029_data *rv3029)
a7f6e287
MB		 145{
146 /* Re-enable eeprom refresh */
609e97fe 147 return regmap_update_bits(rv3029->regmap, RV3029_ONOFF_CTRL,
4e7f1a60
MJ		 148 RV3029_ONOFF_CTRL_EERE,
149 RV3029_ONOFF_CTRL_EERE);
a7f6e287
MB		 150}
151
7518dd9a 152static int rv3029_eeprom_enter(struct rv3029_data *rv3029)
a7f6e287 153{
bb72dbba 154 unsigned int sr;
a7f6e287 155 int ret;
a7f6e287
MB		 156
157 /* Check whether we are in the allowed voltage range. */
bb72dbba 158 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
a7f6e287
MB		 159 if (ret < 0)
160 return ret;
cff2e4d2
AB		 161 if (sr & RV3029_STATUS_VLOW2)
162 return -ENODEV;
163 if (sr & RV3029_STATUS_VLOW1) {
a7f6e287
MB		 164 /* We clear the bits and retry once just in case
165 * we had a brown out in early startup.
166 */
54c5970d 167 ret = regmap_update_bits(rv3029->regmap, RV3029_STATUS,
cff2e4d2 168 RV3029_STATUS_VLOW1, 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;
cff2e4d2 175 if (sr & RV3029_STATUS_VLOW1) {
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);
7518dd9a 269 unsigned int flags, controls;
0ddc5b89 270 unsigned long events = 0;
0ddc5b89
MJ		 271 int ret;
272
2a5654fe 273 rtc_lock(rv3029->rtc);
0ddc5b89 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);
2a5654fe 278 rtc_unlock(rv3029->rtc);
0ddc5b89
MJ		 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);
2a5654fe 285 rtc_unlock(rv3029->rtc);
0ddc5b89
MJ		 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 299 }
2a5654fe 300 rtc_unlock(rv3029->rtc);
0ddc5b89
MJ		 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);
bd0d9379 321 if (ret < 0)
52365230 322 return ret;
52365230 323
abe2f551
MJ		 324 tm->tm_sec = bcd2bin(regs[RV3029_W_SEC - RV3029_W_SEC]);
325 tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES - RV3029_W_SEC]);
52365230
HS		 326
327 /* HR field has a more complex interpretation */
328 {
abe2f551 329 const u8 _hr = regs[RV3029_W_HOURS - RV3029_W_SEC];
aba39d27
MB		 330
331 if (_hr & RV3029_REG_HR_12_24) {
52365230
HS		 332 /* 12h format */
333 tm->tm_hour = bcd2bin(_hr & 0x1f);
aba39d27 334 if (_hr & RV3029_REG_HR_PM) /* PM flag set */
52365230
HS		 335 tm->tm_hour += 12;
336 } else /* 24h format */
337 tm->tm_hour = bcd2bin(_hr & 0x3f);
338 }
339
abe2f551
MJ		 340 tm->tm_mday = bcd2bin(regs[RV3029_W_DATE - RV3029_W_SEC]);
341 tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS - RV3029_W_SEC]) - 1;
342 tm->tm_year = bcd2bin(regs[RV3029_W_YEARS - RV3029_W_SEC]) + 100;
343 tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS - RV3029_W_SEC]) - 1;
52365230
HS		 344
345 return 0;
346}
347
e6e38082 348static int rv3029_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
52365230 349{
7518dd9a 350 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230 351 struct rtc_time *const tm = &alarm->time;
7518dd9a 352 unsigned int controls, flags;
52365230 353 int ret;
7518dd9a 354 u8 regs[8];
52365230 355
7518dd9a 356 ret = regmap_bulk_read(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 357 RV3029_ALARM_SECTION_LEN);
bd0d9379 358 if (ret < 0)
52365230 359 return ret;
52365230 360
7518dd9a 361 ret = regmap_read(rv3029->regmap, RV3029_IRQ_CTRL, &controls);
bd0d9379 362 if (ret)
0ddc5b89 363 return ret;
bd0d9379 364
7518dd9a 365 ret = regmap_read(rv3029->regmap, RV3029_IRQ_FLAGS, &flags);
bd0d9379 366 if (ret < 0)
0ddc5b89 367 return ret;
0ddc5b89 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
dc492e86
MJ		 399 /* Activate all the alarms with AE_x bit */
400 regs[RV3029_A_SC - RV3029_A_SC] = bin2bcd(tm->tm_sec) | RV3029_A_AE_X;
401 regs[RV3029_A_MN - RV3029_A_SC] = bin2bcd(tm->tm_min) | RV3029_A_AE_X;
402 regs[RV3029_A_HR - RV3029_A_SC] = (bin2bcd(tm->tm_hour) & 0x3f)
403 | RV3029_A_AE_X;
404 regs[RV3029_A_DT - RV3029_A_SC] = (bin2bcd(tm->tm_mday) & 0x3f)
405 | RV3029_A_AE_X;
406 regs[RV3029_A_MO - RV3029_A_SC] = (bin2bcd(tm->tm_mon + 1) & 0x1f)
407 | RV3029_A_AE_X;
408 regs[RV3029_A_DW - RV3029_A_SC] = (bin2bcd(tm->tm_wday + 1) & 0x7)
409 | RV3029_A_AE_X;
410 regs[RV3029_A_YR - RV3029_A_SC] = (bin2bcd(tm->tm_year - 100))
411 | RV3029_A_AE_X;
412
413 /* Write the alarm */
7518dd9a 414 ret = regmap_bulk_write(rv3029->regmap, RV3029_A_SC, regs,
4e7f1a60 415 RV3029_ALARM_SECTION_LEN);
52365230
HS		 416 if (ret < 0)
417 return ret;
418
8fd3d609 419 return rv3029_alarm_irq_enable(dev, alarm->enabled);
52365230
HS		 420}
421
e6e38082 422static int rv3029_set_time(struct device *dev, struct rtc_time *tm)
52365230 423{
54c5970d 424 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
52365230
HS		 425 u8 regs[8];
426 int ret;
427
abe2f551
MJ		 428 regs[RV3029_W_SEC - RV3029_W_SEC] = bin2bcd(tm->tm_sec);
429 regs[RV3029_W_MINUTES - RV3029_W_SEC] = bin2bcd(tm->tm_min);
430 regs[RV3029_W_HOURS - RV3029_W_SEC] = bin2bcd(tm->tm_hour);
431 regs[RV3029_W_DATE - RV3029_W_SEC] = bin2bcd(tm->tm_mday);
432 regs[RV3029_W_MONTHS - RV3029_W_SEC] = bin2bcd(tm->tm_mon + 1);
38201ca3 433 regs[RV3029_W_DAYS - RV3029_W_SEC] = bin2bcd(tm->tm_wday + 1) & 0x7;
abe2f551 434 regs[RV3029_W_YEARS - RV3029_W_SEC] = bin2bcd(tm->tm_year - 100);
52365230 435
7518dd9a 436 ret = regmap_bulk_write(rv3029->regmap, RV3029_W_SEC, regs,
4e7f1a60 437 RV3029_WATCH_SECTION_LEN);
52365230
HS		 438 if (ret < 0)
439 return ret;
440
cff2e4d2 441 /* clear PON and VLOW2 bits */
54c5970d 442 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
cff2e4d2 443 RV3029_STATUS_PON | RV3029_STATUS_VLOW2, 0);
52365230 444}
abe2f551 445
f630f728
AB		 446static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
447{
448 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
449 unsigned long vl = 0;
450 int sr, ret = 0;
451
452 switch (cmd) {
453 case RTC_VL_READ:
454 ret = regmap_read(rv3029->regmap, RV3029_STATUS, &sr);
455 if (ret < 0)
456 return ret;
457
458 if (sr & RV3029_STATUS_VLOW1)
459 vl = RTC_VL_ACCURACY_LOW;
460
461 if (sr & (RV3029_STATUS_VLOW2 | RV3029_STATUS_PON))
462 vl |= RTC_VL_DATA_INVALID;
463
464 return put_user(vl, (unsigned int __user *)arg);
465
466 case RTC_VL_CLR:
467 return regmap_update_bits(rv3029->regmap, RV3029_STATUS,
468 RV3029_STATUS_VLOW1, 0);
469
470 default:
471 return -ENOIOCTLCMD;
472 }
473}
474
ec923fcc
AB		 475static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
476 size_t bytes)
477{
478 return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
479}
480
481static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
482 size_t bytes)
483{
484 return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
485}
486
e27e2160
MB		 487static const struct rv3029_trickle_tab_elem {
488 u32 r; /* resistance in ohms */
489 u8 conf; /* trickle config bits */
490} rv3029_trickle_tab[] = {
491 {
492 .r = 1076,
493 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
494 RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
495 }, {
496 .r = 1091,
497 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
498 RV3029_TRICKLE_20K,
499 }, {
500 .r = 1137,
501 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K |
502 RV3029_TRICKLE_80K,
503 }, {
504 .r = 1154,
505 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K,
506 }, {
507 .r = 1371,
508 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K |
509 RV3029_TRICKLE_80K,
510 }, {
511 .r = 1395,
512 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K,
513 }, {
514 .r = 1472,
515 .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K,
516 }, {
517 .r = 1500,
518 .conf = RV3029_TRICKLE_1K,
519 }, {
520 .r = 3810,
521 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K |
522 RV3029_TRICKLE_80K,
523 }, {
524 .r = 4000,
525 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K,
526 }, {
527 .r = 4706,
528 .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K,
529 }, {
530 .r = 5000,
531 .conf = RV3029_TRICKLE_5K,
532 }, {
533 .r = 16000,
534 .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K,
535 }, {
536 .r = 20000,
537 .conf = RV3029_TRICKLE_20K,
538 }, {
539 .r = 80000,
540 .conf = RV3029_TRICKLE_80K,
541 },
542};
543
e6e38082 544static void rv3029_trickle_config(struct device *dev)
e27e2160 545{
7518dd9a 546 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
e6e38082 547 struct device_node *of_node = dev->of_node;
e27e2160
MB		 548 const struct rv3029_trickle_tab_elem *elem;
549 int i, err;
550 u32 ohms;
39387dc2 551 u8 trickle_set_bits;
e27e2160
MB		 552
553 if (!of_node)
554 return;
555
556 /* Configure the trickle charger. */
e27e2160
MB		 557 err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms);
558 if (err) {
559 /* Disable trickle charger. */
39387dc2 560 trickle_set_bits = 0;
e27e2160
MB		 561 } else {
562 /* Enable trickle charger. */
563 for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) {
564 elem = &rv3029_trickle_tab[i];
565 if (elem->r >= ohms)
566 break;
567 }
39387dc2 568 trickle_set_bits = elem->conf;
e6e38082 569 dev_info(dev,
e27e2160
MB		 570 "Trickle charger enabled at %d ohms resistance.\n",
571 elem->r);
572 }
7518dd9a 573 err = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
39387dc2
MB		 574 RV3029_TRICKLE_MASK,
575 trickle_set_bits);
abe2f551 576 if (err < 0)
e6e38082 577 dev_err(dev, "Failed to update trickle charger config\n");
e27e2160
MB		 578}
579
a696b31e
MB		 580#ifdef CONFIG_RTC_DRV_RV3029_HWMON
581
7518dd9a 582static int rv3029_read_temp(struct rv3029_data *rv3029, int *temp_mC)
a696b31e 583{
7518dd9a 584 unsigned int temp;
a696b31e 585 int ret;
a696b31e 586
7518dd9a 587 ret = regmap_read(rv3029->regmap, RV3029_TEMP_PAGE, &temp);
a696b31e
MB		 588 if (ret < 0)
589 return ret;
590
591 *temp_mC = ((int)temp - 60) * 1000;
592
593 return 0;
594}
595
596static ssize_t rv3029_hwmon_show_temp(struct device *dev,
597 struct device_attribute *attr,
598 char *buf)
599{
7518dd9a 600 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 601 int ret, temp_mC;
602
7518dd9a 603 ret = rv3029_read_temp(rv3029, &temp_mC);
a696b31e
MB		 604 if (ret < 0)
605 return ret;
606
607 return sprintf(buf, "%d\n", temp_mC);
608}
609
610static ssize_t rv3029_hwmon_set_update_interval(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf,
613 size_t count)
614{
7518dd9a
AB		 615 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
616 unsigned int th_set_bits = 0;
a696b31e
MB		 617 unsigned long interval_ms;
618 int ret;
a696b31e
MB		 619
620 ret = kstrtoul(buf, 10, &interval_ms);
621 if (ret < 0)
622 return ret;
623
624 if (interval_ms != 0) {
625 th_set_bits |= RV3029_EECTRL_THE;
626 if (interval_ms >= 16000)
627 th_set_bits |= RV3029_EECTRL_THP;
628 }
7518dd9a 629 ret = rv3029_eeprom_update_bits(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 630 RV3029_EECTRL_THE | RV3029_EECTRL_THP,
631 th_set_bits);
632 if (ret < 0)
633 return ret;
634
635 return count;
636}
637
638static ssize_t rv3029_hwmon_show_update_interval(struct device *dev,
639 struct device_attribute *attr,
640 char *buf)
641{
7518dd9a 642 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 643 int ret, interval_ms;
644 u8 eectrl;
645
7518dd9a 646 ret = rv3029_eeprom_read(rv3029, RV3029_CONTROL_E2P_EECTRL,
a696b31e
MB		 647 &eectrl, 1);
648 if (ret < 0)
649 return ret;
650
651 if (eectrl & RV3029_EECTRL_THE) {
652 if (eectrl & RV3029_EECTRL_THP)
653 interval_ms = 16000;
654 else
655 interval_ms = 1000;
656 } else {
657 interval_ms = 0;
658 }
659
660 return sprintf(buf, "%d\n", interval_ms);
661}
662
663static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp,
664 NULL, 0);
665static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
666 rv3029_hwmon_show_update_interval,
667 rv3029_hwmon_set_update_interval, 0);
668
669static struct attribute *rv3029_hwmon_attrs[] = {
670 &sensor_dev_attr_temp1_input.dev_attr.attr,
671 &sensor_dev_attr_update_interval.dev_attr.attr,
672 NULL,
673};
674ATTRIBUTE_GROUPS(rv3029_hwmon);
675
e6e38082 676static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e 677{
e6e38082 678 struct rv3029_data *rv3029 = dev_get_drvdata(dev);
a696b31e
MB		 679 struct device *hwmon_dev;
680
e6e38082
MJ		 681 hwmon_dev = devm_hwmon_device_register_with_groups(dev, name, rv3029,
682 rv3029_hwmon_groups);
a696b31e 683 if (IS_ERR(hwmon_dev)) {
e6e38082 684 dev_warn(dev, "unable to register hwmon device %ld\n",
4e7f1a60 685 PTR_ERR(hwmon_dev));
a696b31e
MB		 686 }
687}
688
689#else /* CONFIG_RTC_DRV_RV3029_HWMON */
690
e6e38082 691static void rv3029_hwmon_register(struct device *dev, const char *name)
a696b31e
MB		 692{
693}
694
695#endif /* CONFIG_RTC_DRV_RV3029_HWMON */
696
9476b67b 697static const struct rtc_class_ops rv3029_rtc_ops = {
e6e38082
MJ		 698 .read_time = rv3029_read_time,
699 .set_time = rv3029_set_time,
f630f728 700 .ioctl = rv3029_ioctl,
9476b67b
AB		 701 .read_alarm = rv3029_read_alarm,
702 .set_alarm = rv3029_set_alarm,
703 .alarm_irq_enable = rv3029_alarm_irq_enable,
52365230
HS		 704};
705
e6e38082
MJ		 706static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
707 const char *name)
52365230 708{
e6e38082 709 struct rv3029_data *rv3029;
ec923fcc
AB		 710 struct nvmem_config nvmem_cfg = {
711 .name = "rv3029_nvram",
712 .word_size = 1,
713 .stride = 1,
714 .size = RV3029_RAM_SECTION_LEN,
715 .type = NVMEM_TYPE_BATTERY_BACKED,
716 .reg_read = rv3029_nvram_read,
717 .reg_write = rv3029_nvram_write,
718 };
52365230 719 int rc = 0;
52365230 720
e6e38082
MJ		 721 rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
722 if (!rv3029)
723 return -ENOMEM;
724
725 rv3029->regmap = regmap;
726 rv3029->irq = irq;
727 rv3029->dev = dev;
728 dev_set_drvdata(dev, rv3029);
52365230 729
e6e38082
MJ		 730 rv3029_trickle_config(dev);
731 rv3029_hwmon_register(dev, name);
732
9346f870
AB		 733 rv3029->rtc = devm_rtc_allocate_device(dev);
734 if (IS_ERR(rv3029->rtc))
0ddc5b89 735 return PTR_ERR(rv3029->rtc);
e27e2160 736
0ddc5b89 737 if (rv3029->irq > 0) {
bfff849f
AB		 738 unsigned long irqflags = IRQF_TRIGGER_LOW;
739
740 if (dev_fwnode(dev))
741 irqflags = 0;
742
0ddc5b89
MJ		 743 rc = devm_request_threaded_irq(dev, rv3029->irq,
744 NULL, rv3029_handle_irq,
bfff849f 745 irqflags | IRQF_ONESHOT,
0ddc5b89
MJ		 746 "rv3029", dev);
747 if (rc) {
748 dev_warn(dev, "unable to request IRQ, alarms disabled\n");
749 rv3029->irq = 0;
0ddc5b89
MJ		 750 }
751 }
9476b67b
AB		 752 if (!rv3029->irq)
753 clear_bit(RTC_FEATURE_ALARM, rv3029->rtc->features);
0ddc5b89 754
9346f870 755 rv3029->rtc->ops = &rv3029_rtc_ops;
cbc943eb
AB		 756 rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
757 rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
9346f870 758
fdcfd854 759 rc = devm_rtc_register_device(rv3029->rtc);
ec923fcc
AB		 760 if (rc)
761 return rc;
762
763 nvmem_cfg.priv = rv3029->regmap;
3a905c2d 764 devm_rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);
ec923fcc
AB		 765
766 return 0;
e6e38082 767}
52365230 768
c509e434
AB		 769static const struct regmap_range rv3029_holes_range[] = {
770 regmap_reg_range(0x05, 0x07),
771 regmap_reg_range(0x0f, 0x0f),
772 regmap_reg_range(0x17, 0x17),
773 regmap_reg_range(0x1a, 0x1f),
774 regmap_reg_range(0x21, 0x27),
775 regmap_reg_range(0x34, 0x37),
776};
777
778static const struct regmap_access_table rv3029_regs = {
779 .no_ranges = rv3029_holes_range,
780 .n_no_ranges = ARRAY_SIZE(rv3029_holes_range),
781};
782
783static const struct regmap_config config = {
784 .reg_bits = 8,
785 .val_bits = 8,
786 .rd_table = &rv3029_regs,
787 .wr_table = &rv3029_regs,
788 .max_register = 0x3f,
789};
790
c2a1c145
MJ		 791#if IS_ENABLED(CONFIG_I2C)
792
3f4a3322 793static int rv3029_i2c_probe(struct i2c_client *client)
e6e38082
MJ		 794{
795 struct regmap *regmap;
e6e38082
MJ		 796 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
797 I2C_FUNC_SMBUS_BYTE)) {
798 dev_err(&client->dev, "Adapter does not support SMBUS_I2C_BLOCK or SMBUS_I2C_BYTE\n");
799 return -ENODEV;
800 }
52365230 801
e6e38082 802 regmap = devm_regmap_init_i2c(client, &config);
bd0d9379 803 if (IS_ERR(regmap))
e6e38082 804 return PTR_ERR(regmap);
52365230 805
e6e38082 806 return rv3029_probe(&client->dev, regmap, client->irq, client->name);
52365230
HS		 807}
808
45a63518 809static const struct i2c_device_id rv3029_id[] = {
814db2bc
AB		 810 { "rv3029", 0 },
811 { "rv3029c2", 0 },
812 { }
813};
814MODULE_DEVICE_TABLE(i2c, rv3029_id);
815
788babdd 816static const __maybe_unused struct of_device_id rv3029_of_match[] = {
45b611c8 817 { .compatible = "microcrystal,rv3029" },
e696a1dd
JMC		 818 { }
819};
820MODULE_DEVICE_TABLE(of, rv3029_of_match);
821
aba39d27 822static struct i2c_driver rv3029_driver = {
52365230 823 .driver = {
9b45ef97 824 .name = "rv3029",
e696a1dd 825 .of_match_table = of_match_ptr(rv3029_of_match),
52365230 826 },
3f4a3322 827 .probe_new = rv3029_i2c_probe,
aba39d27 828 .id_table = rv3029_id,
52365230
HS		 829};
830
fc219291 831static int __init rv3029_register_driver(void)
c2a1c145
MJ		 832{
833 return i2c_add_driver(&rv3029_driver);
834}
835
836static void rv3029_unregister_driver(void)
837{
838 i2c_del_driver(&rv3029_driver);
839}
840
841#else
842
fc219291 843static int __init rv3029_register_driver(void)
c2a1c145
MJ		 844{
845 return 0;
846}
847
848static void rv3029_unregister_driver(void)
849{
850}
851
852#endif
853
854#if IS_ENABLED(CONFIG_SPI_MASTER)
855
856static int rv3049_probe(struct spi_device *spi)
857{
c2a1c145
MJ		 858 struct regmap *regmap;
859
860 regmap = devm_regmap_init_spi(spi, &config);
bd0d9379 861 if (IS_ERR(regmap))
c2a1c145 862 return PTR_ERR(regmap);
c2a1c145
MJ		 863
864 return rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
865}
866
867static struct spi_driver rv3049_driver = {
868 .driver = {
869 .name = "rv3049",
870 },
871 .probe = rv3049_probe,
872};
873
fc219291 874static int __init rv3049_register_driver(void)
c2a1c145
MJ		 875{
876 return spi_register_driver(&rv3049_driver);
877}
878
fc219291 879static void __exit rv3049_unregister_driver(void)
c2a1c145
MJ		 880{
881 spi_unregister_driver(&rv3049_driver);
882}
883
884#else
885
fc219291 886static int __init rv3049_register_driver(void)
c2a1c145
MJ		 887{
888 return 0;
889}
890
fc219291 891static void __exit rv3049_unregister_driver(void)
c2a1c145
MJ		 892{
893}
894
895#endif
896
897static int __init rv30x9_init(void)
898{
899 int ret;
900
901 ret = rv3029_register_driver();
bd0d9379 902 if (ret)
c2a1c145 903 return ret;
c2a1c145
MJ		 904
905 ret = rv3049_register_driver();
bd0d9379 906 if (ret)
c2a1c145 907 rv3029_unregister_driver();
c2a1c145
MJ		 908
909 return ret;
910}
911module_init(rv30x9_init)
912
913static void __exit rv30x9_exit(void)
914{
915 rv3049_unregister_driver();
916 rv3029_unregister_driver();
917}
918module_exit(rv30x9_exit)
52365230
HS		 919
920MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
2dca3d9e 921MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
c2a1c145 922MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
52365230 923MODULE_LICENSE("GPL");
c2a1c145 924MODULE_ALIAS("spi:rv3049");
Linux 6.x block layer and io_uring tree(s)