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e6e7376c AB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * RTC driver for the Micro Crystal RV3028 | |
4 | * | |
5 | * Copyright (C) 2019 Micro Crystal SA | |
6 | * | |
7 | * Alexandre Belloni <alexandre.belloni@bootlin.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/bcd.h> | |
12 | #include <linux/bitops.h> | |
13 | #include <linux/i2c.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/log2.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of_device.h> | |
19 | #include <linux/regmap.h> | |
20 | #include <linux/rtc.h> | |
21 | ||
22 | #define RV3028_SEC 0x00 | |
23 | #define RV3028_MIN 0x01 | |
24 | #define RV3028_HOUR 0x02 | |
25 | #define RV3028_WDAY 0x03 | |
26 | #define RV3028_DAY 0x04 | |
27 | #define RV3028_MONTH 0x05 | |
28 | #define RV3028_YEAR 0x06 | |
29 | #define RV3028_ALARM_MIN 0x07 | |
30 | #define RV3028_ALARM_HOUR 0x08 | |
31 | #define RV3028_ALARM_DAY 0x09 | |
32 | #define RV3028_STATUS 0x0E | |
33 | #define RV3028_CTRL1 0x0F | |
34 | #define RV3028_CTRL2 0x10 | |
35 | #define RV3028_EVT_CTRL 0x13 | |
36 | #define RV3028_TS_COUNT 0x14 | |
37 | #define RV3028_TS_SEC 0x15 | |
38 | #define RV3028_RAM1 0x1F | |
39 | #define RV3028_EEPROM_ADDR 0x25 | |
40 | #define RV3028_EEPROM_DATA 0x26 | |
41 | #define RV3028_EEPROM_CMD 0x27 | |
42 | #define RV3028_CLKOUT 0x35 | |
43 | #define RV3028_OFFSET 0x36 | |
44 | #define RV3028_BACKUP 0x37 | |
45 | ||
46 | #define RV3028_STATUS_PORF BIT(0) | |
47 | #define RV3028_STATUS_EVF BIT(1) | |
48 | #define RV3028_STATUS_AF BIT(2) | |
49 | #define RV3028_STATUS_TF BIT(3) | |
50 | #define RV3028_STATUS_UF BIT(4) | |
51 | #define RV3028_STATUS_BSF BIT(5) | |
52 | #define RV3028_STATUS_CLKF BIT(6) | |
53 | #define RV3028_STATUS_EEBUSY BIT(7) | |
54 | ||
55 | #define RV3028_CTRL1_EERD BIT(3) | |
56 | #define RV3028_CTRL1_WADA BIT(5) | |
57 | ||
58 | #define RV3028_CTRL2_RESET BIT(0) | |
59 | #define RV3028_CTRL2_12_24 BIT(1) | |
60 | #define RV3028_CTRL2_EIE BIT(2) | |
61 | #define RV3028_CTRL2_AIE BIT(3) | |
62 | #define RV3028_CTRL2_TIE BIT(4) | |
63 | #define RV3028_CTRL2_UIE BIT(5) | |
64 | #define RV3028_CTRL2_TSE BIT(7) | |
65 | ||
66 | #define RV3028_EVT_CTRL_TSR BIT(2) | |
67 | ||
68 | #define RV3028_EEPROM_CMD_WRITE 0x21 | |
69 | #define RV3028_EEPROM_CMD_READ 0x22 | |
70 | ||
71 | #define RV3028_EEBUSY_POLL 10000 | |
72 | #define RV3028_EEBUSY_TIMEOUT 100000 | |
73 | ||
74 | #define RV3028_BACKUP_TCE BIT(5) | |
75 | #define RV3028_BACKUP_TCR_MASK GENMASK(1,0) | |
76 | ||
77 | #define OFFSET_STEP_PPT 953674 | |
78 | ||
79 | enum rv3028_type { | |
80 | rv_3028, | |
81 | }; | |
82 | ||
83 | struct rv3028_data { | |
84 | struct regmap *regmap; | |
85 | struct rtc_device *rtc; | |
86 | enum rv3028_type type; | |
87 | }; | |
88 | ||
89 | static u16 rv3028_trickle_resistors[] = {1000, 3000, 6000, 11000}; | |
90 | ||
91 | static ssize_t timestamp0_store(struct device *dev, | |
92 | struct device_attribute *attr, | |
93 | const char *buf, size_t count) | |
94 | { | |
95 | struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); | |
96 | ||
97 | regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR, | |
98 | RV3028_EVT_CTRL_TSR); | |
99 | ||
100 | return count; | |
101 | }; | |
102 | ||
103 | static ssize_t timestamp0_show(struct device *dev, | |
104 | struct device_attribute *attr, char *buf) | |
105 | { | |
106 | struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); | |
107 | struct rtc_time tm; | |
108 | int ret, count; | |
109 | u8 date[6]; | |
110 | ||
111 | ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count); | |
112 | if (ret) | |
113 | return ret; | |
114 | ||
115 | if (!count) | |
116 | return 0; | |
117 | ||
118 | ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date, | |
119 | sizeof(date)); | |
120 | if (ret) | |
121 | return ret; | |
122 | ||
123 | tm.tm_sec = bcd2bin(date[0]); | |
124 | tm.tm_min = bcd2bin(date[1]); | |
125 | tm.tm_hour = bcd2bin(date[2]); | |
126 | tm.tm_mday = bcd2bin(date[3]); | |
127 | tm.tm_mon = bcd2bin(date[4]) - 1; | |
128 | tm.tm_year = bcd2bin(date[5]) + 100; | |
129 | ||
130 | ret = rtc_valid_tm(&tm); | |
131 | if (ret) | |
132 | return ret; | |
133 | ||
134 | return sprintf(buf, "%llu\n", | |
135 | (unsigned long long)rtc_tm_to_time64(&tm)); | |
136 | }; | |
137 | ||
138 | static DEVICE_ATTR_RW(timestamp0); | |
139 | ||
140 | static ssize_t timestamp0_count_show(struct device *dev, | |
141 | struct device_attribute *attr, char *buf) | |
142 | { | |
143 | struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent); | |
144 | int ret, count; | |
145 | ||
146 | ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count); | |
147 | if (ret) | |
148 | return ret; | |
149 | ||
150 | return sprintf(buf, "%u\n", count); | |
151 | }; | |
152 | ||
153 | static DEVICE_ATTR_RO(timestamp0_count); | |
154 | ||
155 | static struct attribute *rv3028_attrs[] = { | |
156 | &dev_attr_timestamp0.attr, | |
157 | &dev_attr_timestamp0_count.attr, | |
158 | NULL | |
159 | }; | |
160 | ||
161 | static const struct attribute_group rv3028_attr_group = { | |
162 | .attrs = rv3028_attrs, | |
163 | }; | |
164 | ||
165 | static irqreturn_t rv3028_handle_irq(int irq, void *dev_id) | |
166 | { | |
167 | struct rv3028_data *rv3028 = dev_id; | |
168 | unsigned long events = 0; | |
169 | u32 status = 0, ctrl = 0; | |
170 | ||
171 | if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 || | |
172 | status == 0) { | |
173 | return IRQ_NONE; | |
174 | } | |
175 | ||
176 | if (status & RV3028_STATUS_PORF) | |
177 | dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n"); | |
178 | ||
179 | if (status & RV3028_STATUS_TF) { | |
180 | status |= RV3028_STATUS_TF; | |
181 | ctrl |= RV3028_CTRL2_TIE; | |
182 | events |= RTC_PF; | |
183 | } | |
184 | ||
185 | if (status & RV3028_STATUS_AF) { | |
186 | status |= RV3028_STATUS_AF; | |
187 | ctrl |= RV3028_CTRL2_AIE; | |
188 | events |= RTC_AF; | |
189 | } | |
190 | ||
191 | if (status & RV3028_STATUS_UF) { | |
192 | status |= RV3028_STATUS_UF; | |
193 | ctrl |= RV3028_CTRL2_UIE; | |
194 | events |= RTC_UF; | |
195 | } | |
196 | ||
197 | if (events) { | |
198 | rtc_update_irq(rv3028->rtc, 1, events); | |
199 | regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0); | |
200 | regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0); | |
201 | } | |
202 | ||
203 | if (status & RV3028_STATUS_EVF) { | |
204 | sysfs_notify(&rv3028->rtc->dev.kobj, NULL, | |
205 | dev_attr_timestamp0.attr.name); | |
206 | dev_warn(&rv3028->rtc->dev, "event detected"); | |
207 | } | |
208 | ||
209 | return IRQ_HANDLED; | |
210 | } | |
211 | ||
212 | static int rv3028_get_time(struct device *dev, struct rtc_time *tm) | |
213 | { | |
214 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
215 | u8 date[7]; | |
216 | int ret, status; | |
217 | ||
218 | ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); | |
219 | if (ret < 0) | |
220 | return ret; | |
221 | ||
222 | if (status & RV3028_STATUS_PORF) { | |
223 | dev_warn(dev, "Voltage low, data is invalid.\n"); | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date)); | |
228 | if (ret) | |
229 | return ret; | |
230 | ||
231 | tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f); | |
232 | tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f); | |
233 | tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f); | |
234 | tm->tm_wday = ilog2(date[RV3028_WDAY] & 0x7f); | |
235 | tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f); | |
236 | tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1; | |
237 | tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int rv3028_set_time(struct device *dev, struct rtc_time *tm) | |
243 | { | |
244 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
245 | u8 date[7]; | |
246 | int ret; | |
247 | ||
248 | date[RV3028_SEC] = bin2bcd(tm->tm_sec); | |
249 | date[RV3028_MIN] = bin2bcd(tm->tm_min); | |
250 | date[RV3028_HOUR] = bin2bcd(tm->tm_hour); | |
251 | date[RV3028_WDAY] = 1 << (tm->tm_wday); | |
252 | date[RV3028_DAY] = bin2bcd(tm->tm_mday); | |
253 | date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1); | |
254 | date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100); | |
255 | ||
256 | /* | |
257 | * Writing to the Seconds register has the same effect as setting RESET | |
258 | * bit to 1 | |
259 | */ | |
260 | ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date, | |
261 | sizeof(date)); | |
262 | if (ret) | |
263 | return ret; | |
264 | ||
265 | ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, | |
266 | RV3028_STATUS_PORF, 0); | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
271 | static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
272 | { | |
273 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
274 | u8 alarmvals[3]; | |
275 | int status, ctrl, ret; | |
276 | ||
277 | ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals, | |
278 | sizeof(alarmvals)); | |
279 | if (ret) | |
280 | return ret; | |
281 | ||
282 | ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); | |
283 | if (ret < 0) | |
284 | return ret; | |
285 | ||
286 | ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl); | |
287 | if (ret < 0) | |
288 | return ret; | |
289 | ||
290 | alrm->time.tm_sec = 0; | |
291 | alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); | |
292 | alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); | |
293 | alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); | |
294 | ||
295 | alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE); | |
296 | alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
302 | { | |
303 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
304 | u8 alarmvals[3]; | |
305 | u8 ctrl = 0; | |
306 | int ret; | |
307 | ||
308 | /* The alarm has no seconds, round up to nearest minute */ | |
309 | if (alrm->time.tm_sec) { | |
310 | time64_t alarm_time = rtc_tm_to_time64(&alrm->time); | |
311 | ||
312 | alarm_time += 60 - alrm->time.tm_sec; | |
313 | rtc_time64_to_tm(alarm_time, &alrm->time); | |
314 | } | |
315 | ||
316 | ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, | |
317 | RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0); | |
318 | if (ret) | |
319 | return ret; | |
320 | ||
321 | alarmvals[0] = bin2bcd(alrm->time.tm_min); | |
322 | alarmvals[1] = bin2bcd(alrm->time.tm_hour); | |
323 | alarmvals[2] = bin2bcd(alrm->time.tm_mday); | |
324 | ||
325 | ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, | |
326 | RV3028_STATUS_AF, 0); | |
327 | if (ret) | |
328 | return ret; | |
329 | ||
330 | ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals, | |
331 | sizeof(alarmvals)); | |
332 | if (ret) | |
333 | return ret; | |
334 | ||
335 | if (alrm->enabled) { | |
336 | if (rv3028->rtc->uie_rtctimer.enabled) | |
337 | ctrl |= RV3028_CTRL2_UIE; | |
338 | if (rv3028->rtc->aie_timer.enabled) | |
339 | ctrl |= RV3028_CTRL2_AIE; | |
340 | } | |
341 | ||
342 | ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, | |
343 | RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl); | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
349 | { | |
350 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
351 | int ctrl = 0, ret; | |
352 | ||
353 | if (enabled) { | |
354 | if (rv3028->rtc->uie_rtctimer.enabled) | |
355 | ctrl |= RV3028_CTRL2_UIE; | |
356 | if (rv3028->rtc->aie_timer.enabled) | |
357 | ctrl |= RV3028_CTRL2_AIE; | |
358 | } | |
359 | ||
360 | ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, | |
361 | RV3028_STATUS_AF | RV3028_STATUS_UF, 0); | |
362 | if (ret) | |
363 | return ret; | |
364 | ||
365 | ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, | |
366 | RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl); | |
367 | if (ret) | |
368 | return ret; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static int rv3028_read_offset(struct device *dev, long *offset) | |
374 | { | |
375 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
376 | int ret, value, steps; | |
377 | ||
378 | ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | ||
382 | steps = sign_extend32(value << 1, 8); | |
383 | ||
384 | ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value); | |
385 | if (ret < 0) | |
386 | return ret; | |
387 | ||
388 | steps += value >> 7; | |
389 | ||
390 | *offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000); | |
391 | ||
392 | return 0; | |
393 | } | |
394 | ||
395 | static int rv3028_set_offset(struct device *dev, long offset) | |
396 | { | |
397 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
398 | int ret; | |
399 | ||
400 | offset = clamp(offset, -244141L, 243187L) * 1000; | |
401 | offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT); | |
402 | ||
403 | ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1); | |
404 | if (ret < 0) | |
405 | return ret; | |
406 | ||
407 | return regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7), | |
408 | offset << 7); | |
409 | } | |
410 | ||
411 | static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
412 | { | |
413 | struct rv3028_data *rv3028 = dev_get_drvdata(dev); | |
414 | int status, ret = 0; | |
415 | ||
416 | switch (cmd) { | |
417 | case RTC_VL_READ: | |
418 | ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); | |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
422 | if (status & RV3028_STATUS_PORF) | |
423 | dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n"); | |
424 | ||
425 | status &= RV3028_STATUS_PORF; | |
426 | ||
427 | if (copy_to_user((void __user *)arg, &status, sizeof(int))) | |
428 | return -EFAULT; | |
429 | ||
430 | return 0; | |
431 | ||
432 | case RTC_VL_CLR: | |
433 | ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS, | |
434 | RV3028_STATUS_PORF, 0); | |
435 | ||
436 | return ret; | |
437 | ||
438 | default: | |
439 | return -ENOIOCTLCMD; | |
440 | } | |
441 | } | |
442 | ||
443 | static int rv3028_nvram_write(void *priv, unsigned int offset, void *val, | |
444 | size_t bytes) | |
445 | { | |
446 | return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes); | |
447 | } | |
448 | ||
449 | static int rv3028_nvram_read(void *priv, unsigned int offset, void *val, | |
450 | size_t bytes) | |
451 | { | |
452 | return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes); | |
453 | } | |
454 | ||
455 | static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val, | |
456 | size_t bytes) | |
457 | { | |
458 | u32 status, ctrl1; | |
459 | int i, ret, err; | |
460 | u8 *buf = val; | |
461 | ||
462 | ret = regmap_read(priv, RV3028_CTRL1, &ctrl1); | |
463 | if (ret) | |
464 | return ret; | |
465 | ||
466 | if (!(ctrl1 & RV3028_CTRL1_EERD)) { | |
467 | ret = regmap_update_bits(priv, RV3028_CTRL1, | |
468 | RV3028_CTRL1_EERD, RV3028_CTRL1_EERD); | |
469 | if (ret) | |
470 | return ret; | |
471 | ||
472 | ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, | |
473 | !(status & RV3028_STATUS_EEBUSY), | |
474 | RV3028_EEBUSY_POLL, | |
475 | RV3028_EEBUSY_TIMEOUT); | |
476 | if (ret) | |
477 | goto restore_eerd; | |
478 | } | |
479 | ||
480 | for (i = 0; i < bytes; i++) { | |
481 | ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i); | |
482 | if (ret) | |
483 | goto restore_eerd; | |
484 | ||
485 | ret = regmap_write(priv, RV3028_EEPROM_DATA, buf[i]); | |
486 | if (ret) | |
487 | goto restore_eerd; | |
488 | ||
489 | ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0); | |
490 | if (ret) | |
491 | goto restore_eerd; | |
492 | ||
493 | ret = regmap_write(priv, RV3028_EEPROM_CMD, | |
494 | RV3028_EEPROM_CMD_WRITE); | |
495 | if (ret) | |
496 | goto restore_eerd; | |
497 | ||
498 | usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT); | |
499 | ||
500 | ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, | |
501 | !(status & RV3028_STATUS_EEBUSY), | |
502 | RV3028_EEBUSY_POLL, | |
503 | RV3028_EEBUSY_TIMEOUT); | |
504 | if (ret) | |
505 | goto restore_eerd; | |
506 | } | |
507 | ||
508 | restore_eerd: | |
509 | if (!(ctrl1 & RV3028_CTRL1_EERD)) | |
510 | { | |
511 | err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD, | |
512 | 0); | |
513 | if (err && !ret) | |
514 | ret = err; | |
515 | } | |
516 | ||
517 | return ret; | |
518 | } | |
519 | ||
520 | static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val, | |
521 | size_t bytes) | |
522 | { | |
523 | u32 status, ctrl1, data; | |
524 | int i, ret, err; | |
525 | u8 *buf = val; | |
526 | ||
527 | ret = regmap_read(priv, RV3028_CTRL1, &ctrl1); | |
528 | if (ret) | |
529 | return ret; | |
530 | ||
531 | if (!(ctrl1 & RV3028_CTRL1_EERD)) { | |
532 | ret = regmap_update_bits(priv, RV3028_CTRL1, | |
533 | RV3028_CTRL1_EERD, RV3028_CTRL1_EERD); | |
534 | if (ret) | |
535 | return ret; | |
536 | ||
537 | ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, | |
538 | !(status & RV3028_STATUS_EEBUSY), | |
539 | RV3028_EEBUSY_POLL, | |
540 | RV3028_EEBUSY_TIMEOUT); | |
541 | if (ret) | |
542 | goto restore_eerd; | |
543 | } | |
544 | ||
545 | for (i = 0; i < bytes; i++) { | |
546 | ret = regmap_write(priv, RV3028_EEPROM_ADDR, offset + i); | |
547 | if (ret) | |
548 | goto restore_eerd; | |
549 | ||
550 | ret = regmap_write(priv, RV3028_EEPROM_CMD, 0x0); | |
551 | if (ret) | |
552 | goto restore_eerd; | |
553 | ||
554 | ret = regmap_write(priv, RV3028_EEPROM_CMD, | |
555 | RV3028_EEPROM_CMD_READ); | |
556 | if (ret) | |
557 | goto restore_eerd; | |
558 | ||
559 | ret = regmap_read_poll_timeout(priv, RV3028_STATUS, status, | |
560 | !(status & RV3028_STATUS_EEBUSY), | |
561 | RV3028_EEBUSY_POLL, | |
562 | RV3028_EEBUSY_TIMEOUT); | |
563 | if (ret) | |
564 | goto restore_eerd; | |
565 | ||
566 | ret = regmap_read(priv, RV3028_EEPROM_DATA, &data); | |
567 | if (ret) | |
568 | goto restore_eerd; | |
569 | buf[i] = data; | |
570 | } | |
571 | ||
572 | restore_eerd: | |
573 | if (!(ctrl1 & RV3028_CTRL1_EERD)) | |
574 | { | |
575 | err = regmap_update_bits(priv, RV3028_CTRL1, RV3028_CTRL1_EERD, | |
576 | 0); | |
577 | if (err && !ret) | |
578 | ret = err; | |
579 | } | |
580 | ||
581 | return ret; | |
582 | } | |
583 | ||
584 | static struct rtc_class_ops rv3028_rtc_ops = { | |
585 | .read_time = rv3028_get_time, | |
586 | .set_time = rv3028_set_time, | |
587 | .read_offset = rv3028_read_offset, | |
588 | .set_offset = rv3028_set_offset, | |
589 | .ioctl = rv3028_ioctl, | |
590 | }; | |
591 | ||
592 | static const struct regmap_config regmap_config = { | |
593 | .reg_bits = 8, | |
594 | .val_bits = 8, | |
595 | .max_register = 0x37, | |
596 | }; | |
597 | ||
598 | static int rv3028_probe(struct i2c_client *client) | |
599 | { | |
600 | struct rv3028_data *rv3028; | |
601 | int ret, status; | |
602 | u32 ohms; | |
603 | struct nvmem_config nvmem_cfg = { | |
604 | .name = "rv3028_nvram", | |
605 | .word_size = 1, | |
606 | .stride = 1, | |
607 | .size = 2, | |
608 | .type = NVMEM_TYPE_BATTERY_BACKED, | |
609 | .reg_read = rv3028_nvram_read, | |
610 | .reg_write = rv3028_nvram_write, | |
611 | }; | |
612 | struct nvmem_config eeprom_cfg = { | |
613 | .name = "rv3028_eeprom", | |
614 | .word_size = 1, | |
615 | .stride = 1, | |
616 | .size = 43, | |
617 | .type = NVMEM_TYPE_EEPROM, | |
618 | .reg_read = rv3028_eeprom_read, | |
619 | .reg_write = rv3028_eeprom_write, | |
620 | }; | |
621 | ||
622 | rv3028 = devm_kzalloc(&client->dev, sizeof(struct rv3028_data), | |
623 | GFP_KERNEL); | |
624 | if (!rv3028) | |
625 | return -ENOMEM; | |
626 | ||
627 | rv3028->regmap = devm_regmap_init_i2c(client, ®map_config); | |
628 | ||
629 | i2c_set_clientdata(client, rv3028); | |
630 | ||
631 | ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status); | |
632 | if (ret < 0) | |
633 | return ret; | |
634 | ||
635 | if (status & RV3028_STATUS_PORF) | |
636 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
637 | ||
638 | if (status & RV3028_STATUS_AF) | |
639 | dev_warn(&client->dev, "An alarm may have been missed.\n"); | |
640 | ||
641 | rv3028->rtc = devm_rtc_allocate_device(&client->dev); | |
642 | if (IS_ERR(rv3028->rtc)) { | |
643 | return PTR_ERR(rv3028->rtc); | |
644 | } | |
645 | ||
646 | if (client->irq > 0) { | |
647 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
648 | NULL, rv3028_handle_irq, | |
649 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
650 | "rv3028", rv3028); | |
651 | if (ret) { | |
652 | dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
653 | client->irq = 0; | |
654 | } else { | |
655 | rv3028_rtc_ops.read_alarm = rv3028_get_alarm; | |
656 | rv3028_rtc_ops.set_alarm = rv3028_set_alarm; | |
657 | rv3028_rtc_ops.alarm_irq_enable = rv3028_alarm_irq_enable; | |
658 | } | |
659 | } | |
660 | ||
661 | ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1, | |
662 | RV3028_CTRL1_WADA, RV3028_CTRL1_WADA); | |
663 | if (ret) | |
664 | return ret; | |
665 | ||
666 | /* setup timestamping */ | |
667 | ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2, | |
668 | RV3028_CTRL2_EIE | RV3028_CTRL2_TSE, | |
669 | RV3028_CTRL2_EIE | RV3028_CTRL2_TSE); | |
670 | if (ret) | |
671 | return ret; | |
672 | ||
673 | /* setup trickle charger */ | |
674 | if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms", | |
675 | &ohms)) { | |
676 | int i; | |
677 | ||
678 | for (i = 0; i < ARRAY_SIZE(rv3028_trickle_resistors); i++) | |
679 | if (ohms == rv3028_trickle_resistors[i]) | |
680 | break; | |
681 | ||
682 | if (i < ARRAY_SIZE(rv3028_trickle_resistors)) { | |
683 | ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, | |
684 | RV3028_BACKUP_TCE | | |
685 | RV3028_BACKUP_TCR_MASK, | |
686 | RV3028_BACKUP_TCE | i); | |
687 | if (ret) | |
688 | return ret; | |
689 | } else { | |
690 | dev_warn(&client->dev, "invalid trickle resistor value\n"); | |
691 | } | |
692 | } | |
693 | ||
694 | ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group); | |
695 | if (ret) | |
696 | return ret; | |
697 | ||
698 | rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; | |
699 | rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099; | |
700 | rv3028->rtc->ops = &rv3028_rtc_ops; | |
701 | ret = rtc_register_device(rv3028->rtc); | |
702 | if (ret) | |
703 | return ret; | |
704 | ||
705 | nvmem_cfg.priv = rv3028->regmap; | |
706 | rtc_nvmem_register(rv3028->rtc, &nvmem_cfg); | |
707 | eeprom_cfg.priv = rv3028->regmap; | |
708 | rtc_nvmem_register(rv3028->rtc, &eeprom_cfg); | |
709 | ||
710 | rv3028->rtc->max_user_freq = 1; | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static const struct of_device_id rv3028_of_match[] = { | |
716 | { .compatible = "microcrystal,rv3028", }, | |
717 | { } | |
718 | }; | |
719 | MODULE_DEVICE_TABLE(of, rv3028_of_match); | |
720 | ||
721 | static struct i2c_driver rv3028_driver = { | |
722 | .driver = { | |
723 | .name = "rtc-rv3028", | |
724 | .of_match_table = of_match_ptr(rv3028_of_match), | |
725 | }, | |
726 | .probe_new = rv3028_probe, | |
727 | }; | |
728 | module_i2c_driver(rv3028_driver); | |
729 | ||
730 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>"); | |
731 | MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver"); | |
732 | MODULE_LICENSE("GPL v2"); |