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540d1e15 AK |
1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * drivers/rtc/rtc-rc5t619.c | |
4 | * | |
5 | * Real time clock driver for RICOH RC5T619 power management chip. | |
6 | * | |
7 | * Copyright (C) 2019 Andreas Kemnade | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/mfd/rn5t618.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/bcd.h> | |
19 | #include <linux/rtc.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/irqdomain.h> | |
22 | ||
23 | struct rc5t619_rtc { | |
24 | int irq; | |
25 | struct rtc_device *rtc; | |
26 | struct rn5t618 *rn5t618; | |
27 | }; | |
28 | ||
29 | #define CTRL1_ALARM_ENABLED 0x40 | |
30 | #define CTRL1_24HR 0x20 | |
31 | #define CTRL1_PERIODIC_MASK 0xf | |
32 | ||
33 | #define CTRL2_PON 0x10 | |
34 | #define CTRL2_ALARM_STATUS 0x80 | |
35 | #define CTRL2_CTFG 0x4 | |
36 | #define CTRL2_CTC 0x1 | |
37 | ||
38 | #define MONTH_CENTFLAG 0x80 | |
39 | #define HOUR_PMFLAG 0x20 | |
40 | #define MDAY_DAL_EXT 0x80 | |
41 | ||
42 | static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour) | |
43 | { | |
44 | if (hour & HOUR_PMFLAG) { | |
45 | hour = bcd2bin(hour & ~HOUR_PMFLAG); | |
46 | return hour == 12 ? 12 : 12 + hour; | |
47 | } | |
48 | ||
49 | hour = bcd2bin(hour); | |
50 | return hour == 12 ? 0 : hour; | |
51 | } | |
52 | ||
53 | static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour) | |
54 | { | |
55 | if (!hour) | |
56 | return 0x12; | |
57 | ||
58 | if (hour < 12) | |
59 | return bin2bcd(hour); | |
60 | ||
61 | if (hour == 12) | |
62 | return 0x12 | HOUR_PMFLAG; | |
63 | ||
64 | return bin2bcd(hour - 12) | HOUR_PMFLAG; | |
65 | } | |
66 | ||
67 | static int rc5t619_rtc_periodic_disable(struct device *dev) | |
68 | { | |
69 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
70 | int err; | |
71 | ||
72 | /* disable function */ | |
73 | err = regmap_update_bits(rtc->rn5t618->regmap, | |
74 | RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0); | |
75 | if (err < 0) | |
76 | return err; | |
77 | ||
78 | /* clear alarm flag and CTFG */ | |
79 | err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, | |
80 | CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC, | |
81 | 0); | |
82 | if (err < 0) | |
83 | return err; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | /* things to be done once after power on */ | |
89 | static int rc5t619_rtc_pon_setup(struct device *dev) | |
90 | { | |
91 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
92 | int err; | |
93 | unsigned int reg_data; | |
94 | ||
95 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, ®_data); | |
96 | if (err < 0) | |
97 | return err; | |
98 | ||
99 | /* clear VDET PON */ | |
100 | reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a); /* 0101-1011 */ | |
101 | reg_data |= 0x20; /* 0010-0000 */ | |
102 | err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data); | |
103 | if (err < 0) | |
104 | return err; | |
105 | ||
106 | /* clearing RTC Adjust register */ | |
107 | err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0); | |
108 | if (err) | |
109 | return err; | |
110 | ||
111 | return regmap_update_bits(rtc->rn5t618->regmap, | |
112 | RN5T618_RTC_CTRL1, | |
113 | CTRL1_24HR, CTRL1_24HR); | |
114 | } | |
115 | ||
116 | static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
117 | { | |
118 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
119 | u8 buff[7]; | |
120 | int err; | |
121 | int cent_flag; | |
122 | unsigned int ctrl1; | |
123 | unsigned int ctrl2; | |
124 | ||
125 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2); | |
126 | if (err < 0) | |
127 | return err; | |
128 | ||
129 | if (ctrl2 & CTRL2_PON) | |
130 | return -EINVAL; | |
131 | ||
132 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1); | |
133 | if (err < 0) | |
134 | return err; | |
135 | ||
136 | err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS, | |
137 | buff, sizeof(buff)); | |
138 | if (err < 0) | |
139 | return err; | |
140 | ||
141 | if (buff[5] & MONTH_CENTFLAG) | |
142 | cent_flag = 1; | |
143 | else | |
144 | cent_flag = 0; | |
145 | ||
146 | tm->tm_sec = bcd2bin(buff[0]); | |
147 | tm->tm_min = bcd2bin(buff[1]); | |
148 | ||
149 | if (ctrl1 & CTRL1_24HR) | |
150 | tm->tm_hour = bcd2bin(buff[2]); | |
151 | else | |
152 | tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]); | |
153 | ||
154 | tm->tm_wday = bcd2bin(buff[3]); | |
155 | tm->tm_mday = bcd2bin(buff[4]); | |
156 | tm->tm_mon = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */ | |
157 | tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
163 | { | |
164 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
165 | u8 buff[7]; | |
166 | int err; | |
167 | int cent_flag; | |
168 | unsigned int ctrl1; | |
169 | unsigned int ctrl2; | |
170 | ||
171 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2); | |
172 | if (err < 0) | |
173 | return err; | |
174 | ||
175 | if (ctrl2 & CTRL2_PON) | |
176 | rc5t619_rtc_pon_setup(dev); | |
177 | ||
178 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1); | |
179 | if (err < 0) | |
180 | return err; | |
181 | ||
182 | if (tm->tm_year >= 100) | |
183 | cent_flag = 1; | |
184 | else | |
185 | cent_flag = 0; | |
186 | ||
187 | buff[0] = bin2bcd(tm->tm_sec); | |
188 | buff[1] = bin2bcd(tm->tm_min); | |
189 | ||
190 | if (ctrl1 & CTRL1_24HR) | |
191 | buff[2] = bin2bcd(tm->tm_hour); | |
192 | else | |
193 | buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour); | |
194 | ||
195 | buff[3] = bin2bcd(tm->tm_wday); | |
196 | buff[4] = bin2bcd(tm->tm_mday); | |
197 | buff[5] = bin2bcd(tm->tm_mon + 1); /* system set 0-11 */ | |
198 | buff[6] = bin2bcd(tm->tm_year - cent_flag * 100); | |
199 | ||
200 | if (cent_flag) | |
201 | buff[5] |= MONTH_CENTFLAG; | |
202 | ||
203 | err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS, | |
204 | buff, sizeof(buff)); | |
205 | if (err < 0) { | |
206 | dev_err(dev, "failed to program new time: %d\n", err); | |
207 | return err; | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | /* 0-disable, 1-enable */ | |
214 | static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled) | |
215 | { | |
216 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
217 | ||
218 | return regmap_update_bits(rtc->rn5t618->regmap, | |
219 | RN5T618_RTC_CTRL1, | |
220 | CTRL1_ALARM_ENABLED, | |
221 | enabled ? CTRL1_ALARM_ENABLED : 0); | |
222 | } | |
223 | ||
224 | static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
225 | { | |
226 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
227 | u8 buff[6]; | |
228 | unsigned int buff_cent; | |
229 | int err; | |
230 | int cent_flag; | |
231 | unsigned int ctrl1; | |
232 | ||
233 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1); | |
234 | if (err) | |
235 | return err; | |
236 | ||
237 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent); | |
238 | if (err < 0) { | |
239 | dev_err(dev, "failed to read time: %d\n", err); | |
240 | return err; | |
241 | } | |
242 | ||
243 | if (buff_cent & MONTH_CENTFLAG) | |
244 | cent_flag = 1; | |
245 | else | |
246 | cent_flag = 0; | |
247 | ||
248 | err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC, | |
249 | buff, sizeof(buff)); | |
250 | if (err) | |
251 | return err; | |
252 | ||
253 | buff[3] = buff[3] & 0x3f; | |
254 | ||
255 | alrm->time.tm_sec = bcd2bin(buff[0]); | |
256 | alrm->time.tm_min = bcd2bin(buff[1]); | |
257 | ||
258 | if (ctrl1 & CTRL1_24HR) | |
259 | alrm->time.tm_hour = bcd2bin(buff[2]); | |
260 | else | |
261 | alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]); | |
262 | ||
263 | alrm->time.tm_mday = bcd2bin(buff[3]); | |
264 | alrm->time.tm_mon = bcd2bin(buff[4]) - 1; | |
265 | alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag; | |
266 | alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED); | |
267 | dev_dbg(dev, "read alarm: %ptR\n", &alrm->time); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
273 | { | |
274 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
275 | u8 buff[6]; | |
276 | int err; | |
277 | int cent_flag; | |
278 | unsigned int ctrl1; | |
279 | ||
280 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1); | |
281 | if (err) | |
282 | return err; | |
283 | ||
284 | err = rc5t619_rtc_alarm_enable(dev, 0); | |
285 | if (err < 0) | |
286 | return err; | |
287 | ||
288 | if (rtc->irq == -1) | |
289 | return -EINVAL; | |
290 | ||
291 | if (alrm->enabled == 0) | |
292 | return 0; | |
293 | ||
294 | if (alrm->time.tm_year >= 100) | |
295 | cent_flag = 1; | |
296 | else | |
297 | cent_flag = 0; | |
298 | ||
299 | alrm->time.tm_mon += 1; | |
300 | buff[0] = bin2bcd(alrm->time.tm_sec); | |
301 | buff[1] = bin2bcd(alrm->time.tm_min); | |
302 | ||
303 | if (ctrl1 & CTRL1_24HR) | |
304 | buff[2] = bin2bcd(alrm->time.tm_hour); | |
305 | else | |
306 | buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour); | |
307 | ||
308 | buff[3] = bin2bcd(alrm->time.tm_mday); | |
309 | buff[4] = bin2bcd(alrm->time.tm_mon); | |
310 | buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag); | |
311 | buff[3] |= MDAY_DAL_EXT; | |
312 | ||
313 | err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC, | |
314 | buff, sizeof(buff)); | |
315 | if (err < 0) | |
316 | return err; | |
317 | ||
318 | return rc5t619_rtc_alarm_enable(dev, alrm->enabled); | |
319 | } | |
320 | ||
321 | static const struct rtc_class_ops rc5t619_rtc_ops = { | |
322 | .read_time = rc5t619_rtc_read_time, | |
323 | .set_time = rc5t619_rtc_set_time, | |
324 | .set_alarm = rc5t619_rtc_set_alarm, | |
325 | .read_alarm = rc5t619_rtc_read_alarm, | |
326 | .alarm_irq_enable = rc5t619_rtc_alarm_enable, | |
327 | }; | |
328 | ||
329 | static int rc5t619_rtc_alarm_flag_clr(struct device *dev) | |
330 | { | |
331 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
332 | ||
333 | /* clear alarm-D status bits.*/ | |
334 | return regmap_update_bits(rtc->rn5t618->regmap, | |
335 | RN5T618_RTC_CTRL2, | |
336 | CTRL2_ALARM_STATUS | CTRL2_CTC, 0); | |
337 | } | |
338 | ||
339 | static irqreturn_t rc5t619_rtc_irq(int irq, void *data) | |
340 | { | |
341 | struct device *dev = data; | |
342 | struct rc5t619_rtc *rtc = dev_get_drvdata(dev); | |
343 | ||
344 | rc5t619_rtc_alarm_flag_clr(dev); | |
345 | ||
346 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
347 | return IRQ_HANDLED; | |
348 | } | |
349 | ||
350 | static int rc5t619_rtc_probe(struct platform_device *pdev) | |
351 | { | |
352 | struct device *dev = &pdev->dev; | |
353 | struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent); | |
354 | struct rc5t619_rtc *rtc; | |
355 | unsigned int ctrl2; | |
356 | int err; | |
357 | ||
358 | rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL); | |
11ddbdfb | 359 | if (!rtc) |
540d1e15 | 360 | return -ENOMEM; |
540d1e15 AK |
361 | |
362 | rtc->rn5t618 = rn5t618; | |
363 | ||
364 | dev_set_drvdata(dev, rtc); | |
365 | rtc->irq = -1; | |
366 | ||
367 | if (rn5t618->irq_data) | |
368 | rtc->irq = regmap_irq_get_virq(rn5t618->irq_data, | |
369 | RN5T618_IRQ_RTC); | |
370 | ||
371 | if (rtc->irq < 0) | |
372 | rtc->irq = -1; | |
373 | ||
374 | err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2); | |
375 | if (err < 0) | |
376 | return err; | |
377 | ||
378 | /* disable rtc periodic function */ | |
379 | err = rc5t619_rtc_periodic_disable(&pdev->dev); | |
380 | if (err) | |
381 | return err; | |
382 | ||
383 | if (ctrl2 & CTRL2_PON) { | |
384 | err = rc5t619_rtc_alarm_flag_clr(&pdev->dev); | |
385 | if (err) | |
386 | return err; | |
387 | } | |
388 | ||
389 | rtc->rtc = devm_rtc_allocate_device(&pdev->dev); | |
390 | if (IS_ERR(rtc->rtc)) { | |
391 | err = PTR_ERR(rtc->rtc); | |
392 | dev_err(dev, "RTC device register: err %d\n", err); | |
393 | return err; | |
394 | } | |
395 | ||
396 | rtc->rtc->ops = &rc5t619_rtc_ops; | |
397 | rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900; | |
398 | rtc->rtc->range_max = RTC_TIMESTAMP_END_2099; | |
399 | ||
400 | /* set interrupt and enable it */ | |
401 | if (rtc->irq != -1) { | |
402 | err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, | |
403 | rc5t619_rtc_irq, | |
404 | IRQF_ONESHOT, | |
405 | "rtc-rc5t619", | |
406 | &pdev->dev); | |
407 | if (err < 0) { | |
408 | dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq); | |
409 | rtc->irq = -1; | |
410 | ||
411 | err = rc5t619_rtc_alarm_enable(&pdev->dev, 0); | |
412 | if (err) | |
413 | return err; | |
414 | ||
415 | } else { | |
416 | /* enable wake */ | |
417 | device_init_wakeup(&pdev->dev, 1); | |
418 | enable_irq_wake(rtc->irq); | |
419 | } | |
420 | } else { | |
421 | /* system don't want to using alarm interrupt, so close it */ | |
422 | err = rc5t619_rtc_alarm_enable(&pdev->dev, 0); | |
423 | if (err) | |
424 | return err; | |
425 | ||
426 | dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n"); | |
427 | } | |
428 | ||
fdcfd854 | 429 | return devm_rtc_register_device(rtc->rtc); |
540d1e15 AK |
430 | } |
431 | ||
432 | static struct platform_driver rc5t619_rtc_driver = { | |
433 | .driver = { | |
434 | .name = "rc5t619-rtc", | |
435 | }, | |
436 | .probe = rc5t619_rtc_probe, | |
437 | }; | |
438 | ||
439 | module_platform_driver(rc5t619_rtc_driver); | |
440 | MODULE_ALIAS("platform:rc5t619-rtc"); | |
441 | MODULE_DESCRIPTION("RICOH RC5T619 RTC driver"); | |
442 | MODULE_LICENSE("GPL"); |