Commit | Line | Data |
---|---|---|
a9687aa2 EN |
1 | /* |
2 | * drivers/rtc/rtc-pcf85363.c | |
3 | * | |
4 | * Driver for NXP PCF85363 real-time clock. | |
5 | * | |
6 | * Copyright (C) 2017 Eric Nelson | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * Based loosely on rtc-8583 by Russell King, Wolfram Sang and Juergen Beisert | |
13 | */ | |
14 | #include <linux/module.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/rtc.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/bcd.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
24 | #include <linux/regmap.h> | |
25 | ||
26 | /* | |
27 | * Date/Time registers | |
28 | */ | |
29 | #define DT_100THS 0x00 | |
30 | #define DT_SECS 0x01 | |
31 | #define DT_MINUTES 0x02 | |
32 | #define DT_HOURS 0x03 | |
33 | #define DT_DAYS 0x04 | |
34 | #define DT_WEEKDAYS 0x05 | |
35 | #define DT_MONTHS 0x06 | |
36 | #define DT_YEARS 0x07 | |
37 | ||
38 | /* | |
39 | * Alarm registers | |
40 | */ | |
41 | #define DT_SECOND_ALM1 0x08 | |
42 | #define DT_MINUTE_ALM1 0x09 | |
43 | #define DT_HOUR_ALM1 0x0a | |
44 | #define DT_DAY_ALM1 0x0b | |
45 | #define DT_MONTH_ALM1 0x0c | |
46 | #define DT_MINUTE_ALM2 0x0d | |
47 | #define DT_HOUR_ALM2 0x0e | |
48 | #define DT_WEEKDAY_ALM2 0x0f | |
49 | #define DT_ALARM_EN 0x10 | |
50 | ||
51 | /* | |
52 | * Time stamp registers | |
53 | */ | |
54 | #define DT_TIMESTAMP1 0x11 | |
55 | #define DT_TIMESTAMP2 0x17 | |
56 | #define DT_TIMESTAMP3 0x1d | |
57 | #define DT_TS_MODE 0x23 | |
58 | ||
59 | /* | |
60 | * control registers | |
61 | */ | |
62 | #define CTRL_OFFSET 0x24 | |
63 | #define CTRL_OSCILLATOR 0x25 | |
64 | #define CTRL_BATTERY 0x26 | |
65 | #define CTRL_PIN_IO 0x27 | |
66 | #define CTRL_FUNCTION 0x28 | |
67 | #define CTRL_INTA_EN 0x29 | |
68 | #define CTRL_INTB_EN 0x2a | |
69 | #define CTRL_FLAGS 0x2b | |
70 | #define CTRL_RAMBYTE 0x2c | |
71 | #define CTRL_WDOG 0x2d | |
72 | #define CTRL_STOP_EN 0x2e | |
73 | #define CTRL_RESETS 0x2f | |
74 | #define CTRL_RAM 0x40 | |
75 | ||
e5aac267 AB |
76 | #define ALRM_SEC_A1E BIT(0) |
77 | #define ALRM_MIN_A1E BIT(1) | |
78 | #define ALRM_HR_A1E BIT(2) | |
79 | #define ALRM_DAY_A1E BIT(3) | |
80 | #define ALRM_MON_A1E BIT(4) | |
81 | #define ALRM_MIN_A2E BIT(5) | |
82 | #define ALRM_HR_A2E BIT(6) | |
83 | #define ALRM_DAY_A2E BIT(7) | |
84 | ||
85 | #define INT_WDIE BIT(0) | |
86 | #define INT_BSIE BIT(1) | |
87 | #define INT_TSRIE BIT(2) | |
88 | #define INT_A2IE BIT(3) | |
89 | #define INT_A1IE BIT(4) | |
90 | #define INT_OIE BIT(5) | |
91 | #define INT_PIE BIT(6) | |
92 | #define INT_ILP BIT(7) | |
93 | ||
94 | #define FLAGS_TSR1F BIT(0) | |
95 | #define FLAGS_TSR2F BIT(1) | |
96 | #define FLAGS_TSR3F BIT(2) | |
97 | #define FLAGS_BSF BIT(3) | |
98 | #define FLAGS_WDF BIT(4) | |
99 | #define FLAGS_A1F BIT(5) | |
100 | #define FLAGS_A2F BIT(6) | |
101 | #define FLAGS_PIF BIT(7) | |
102 | ||
103 | #define PIN_IO_INTAPM GENMASK(1, 0) | |
104 | #define PIN_IO_INTA_CLK 0 | |
105 | #define PIN_IO_INTA_BAT 1 | |
106 | #define PIN_IO_INTA_OUT 2 | |
107 | #define PIN_IO_INTA_HIZ 3 | |
108 | ||
188306ac AB |
109 | #define STOP_EN_STOP BIT(0) |
110 | ||
111 | #define RESET_CPR 0xa4 | |
112 | ||
a9687aa2 EN |
113 | #define NVRAM_SIZE 0x40 |
114 | ||
115 | static struct i2c_driver pcf85363_driver; | |
116 | ||
117 | struct pcf85363 { | |
118 | struct device *dev; | |
119 | struct rtc_device *rtc; | |
a9687aa2 EN |
120 | struct regmap *regmap; |
121 | }; | |
122 | ||
123 | static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
124 | { | |
125 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
126 | unsigned char buf[DT_YEARS + 1]; | |
127 | int ret, len = sizeof(buf); | |
128 | ||
129 | /* read the RTC date and time registers all at once */ | |
130 | ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len); | |
131 | if (ret) { | |
132 | dev_err(dev, "%s: error %d\n", __func__, ret); | |
133 | return ret; | |
134 | } | |
135 | ||
136 | tm->tm_year = bcd2bin(buf[DT_YEARS]); | |
137 | /* adjust for 1900 base of rtc_time */ | |
138 | tm->tm_year += 100; | |
139 | ||
140 | tm->tm_wday = buf[DT_WEEKDAYS] & 7; | |
141 | buf[DT_SECS] &= 0x7F; | |
142 | tm->tm_sec = bcd2bin(buf[DT_SECS]); | |
143 | buf[DT_MINUTES] &= 0x7F; | |
144 | tm->tm_min = bcd2bin(buf[DT_MINUTES]); | |
145 | tm->tm_hour = bcd2bin(buf[DT_HOURS]); | |
146 | tm->tm_mday = bcd2bin(buf[DT_DAYS]); | |
147 | tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
153 | { | |
154 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
188306ac AB |
155 | unsigned char tmp[11]; |
156 | unsigned char *buf = &tmp[2]; | |
157 | int ret; | |
158 | ||
159 | tmp[0] = STOP_EN_STOP; | |
160 | tmp[1] = RESET_CPR; | |
a9687aa2 EN |
161 | |
162 | buf[DT_100THS] = 0; | |
163 | buf[DT_SECS] = bin2bcd(tm->tm_sec); | |
164 | buf[DT_MINUTES] = bin2bcd(tm->tm_min); | |
165 | buf[DT_HOURS] = bin2bcd(tm->tm_hour); | |
166 | buf[DT_DAYS] = bin2bcd(tm->tm_mday); | |
167 | buf[DT_WEEKDAYS] = tm->tm_wday; | |
168 | buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1); | |
169 | buf[DT_YEARS] = bin2bcd(tm->tm_year % 100); | |
170 | ||
188306ac AB |
171 | ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN, |
172 | tmp, sizeof(tmp)); | |
173 | if (ret) | |
174 | return ret; | |
175 | ||
176 | return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0); | |
a9687aa2 EN |
177 | } |
178 | ||
e5aac267 AB |
179 | static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
180 | { | |
181 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
182 | unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1]; | |
183 | unsigned int val; | |
184 | int ret; | |
185 | ||
186 | ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf, | |
187 | sizeof(buf)); | |
188 | if (ret) | |
189 | return ret; | |
190 | ||
191 | alrm->time.tm_sec = bcd2bin(buf[0]); | |
192 | alrm->time.tm_min = bcd2bin(buf[1]); | |
193 | alrm->time.tm_hour = bcd2bin(buf[2]); | |
194 | alrm->time.tm_mday = bcd2bin(buf[3]); | |
195 | alrm->time.tm_mon = bcd2bin(buf[4]) - 1; | |
196 | ||
197 | ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val); | |
198 | if (ret) | |
199 | return ret; | |
200 | ||
201 | alrm->enabled = !!(val & INT_A1IE); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned | |
207 | int enabled) | |
208 | { | |
209 | unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E | | |
210 | ALRM_DAY_A1E | ALRM_MON_A1E; | |
211 | int ret; | |
212 | ||
213 | ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags, | |
214 | enabled ? alarm_flags : 0); | |
215 | if (ret) | |
216 | return ret; | |
217 | ||
218 | ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN, | |
219 | INT_A1IE, enabled ? INT_A1IE : 0); | |
220 | ||
221 | if (ret || enabled) | |
222 | return ret; | |
223 | ||
224 | /* clear current flags */ | |
225 | return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0); | |
226 | } | |
227 | ||
228 | static int pcf85363_rtc_alarm_irq_enable(struct device *dev, | |
229 | unsigned int enabled) | |
230 | { | |
231 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
232 | ||
233 | return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled); | |
234 | } | |
235 | ||
236 | static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
237 | { | |
238 | struct pcf85363 *pcf85363 = dev_get_drvdata(dev); | |
239 | unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1]; | |
240 | int ret; | |
241 | ||
242 | buf[0] = bin2bcd(alrm->time.tm_sec); | |
243 | buf[1] = bin2bcd(alrm->time.tm_min); | |
244 | buf[2] = bin2bcd(alrm->time.tm_hour); | |
245 | buf[3] = bin2bcd(alrm->time.tm_mday); | |
246 | buf[4] = bin2bcd(alrm->time.tm_mon + 1); | |
247 | ||
248 | /* | |
249 | * Disable the alarm interrupt before changing the value to avoid | |
250 | * spurious interrupts | |
251 | */ | |
252 | ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0); | |
253 | if (ret) | |
254 | return ret; | |
255 | ||
256 | ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf, | |
257 | sizeof(buf)); | |
258 | if (ret) | |
259 | return ret; | |
260 | ||
261 | return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled); | |
262 | } | |
263 | ||
264 | static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id) | |
265 | { | |
266 | struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id); | |
267 | unsigned int flags; | |
268 | int err; | |
269 | ||
270 | err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags); | |
271 | if (err) | |
272 | return IRQ_NONE; | |
273 | ||
274 | if (flags & FLAGS_A1F) { | |
275 | rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF); | |
276 | regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0); | |
277 | return IRQ_HANDLED; | |
278 | } | |
279 | ||
280 | return IRQ_NONE; | |
281 | } | |
282 | ||
a9687aa2 EN |
283 | static const struct rtc_class_ops rtc_ops = { |
284 | .read_time = pcf85363_rtc_read_time, | |
285 | .set_time = pcf85363_rtc_set_time, | |
286 | }; | |
287 | ||
e5aac267 AB |
288 | static const struct rtc_class_ops rtc_ops_alarm = { |
289 | .read_time = pcf85363_rtc_read_time, | |
290 | .set_time = pcf85363_rtc_set_time, | |
291 | .read_alarm = pcf85363_rtc_read_alarm, | |
292 | .set_alarm = pcf85363_rtc_set_alarm, | |
293 | .alarm_irq_enable = pcf85363_rtc_alarm_irq_enable, | |
294 | }; | |
295 | ||
a9687aa2 EN |
296 | static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val, |
297 | size_t bytes) | |
298 | { | |
299 | struct pcf85363 *pcf85363 = priv; | |
300 | ||
301 | return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset, | |
302 | val, bytes); | |
303 | } | |
304 | ||
305 | static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val, | |
306 | size_t bytes) | |
307 | { | |
308 | struct pcf85363 *pcf85363 = priv; | |
309 | ||
310 | return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset, | |
311 | val, bytes); | |
312 | } | |
313 | ||
314 | static const struct regmap_config regmap_config = { | |
315 | .reg_bits = 8, | |
316 | .val_bits = 8, | |
c57849dd | 317 | .max_register = 0x7f, |
a9687aa2 EN |
318 | }; |
319 | ||
320 | static int pcf85363_probe(struct i2c_client *client, | |
321 | const struct i2c_device_id *id) | |
322 | { | |
323 | struct pcf85363 *pcf85363; | |
0e7a412f AB |
324 | struct nvmem_config nvmem_cfg = { |
325 | .name = "pcf85363-", | |
326 | .word_size = 1, | |
327 | .stride = 1, | |
328 | .size = NVRAM_SIZE, | |
329 | .reg_read = pcf85363_nvram_read, | |
330 | .reg_write = pcf85363_nvram_write, | |
331 | }; | |
24849d17 | 332 | int ret; |
a9687aa2 EN |
333 | |
334 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) | |
335 | return -ENODEV; | |
336 | ||
337 | pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363), | |
338 | GFP_KERNEL); | |
339 | if (!pcf85363) | |
340 | return -ENOMEM; | |
341 | ||
342 | pcf85363->regmap = devm_regmap_init_i2c(client, ®map_config); | |
343 | if (IS_ERR(pcf85363->regmap)) { | |
344 | dev_err(&client->dev, "regmap allocation failed\n"); | |
345 | return PTR_ERR(pcf85363->regmap); | |
346 | } | |
347 | ||
348 | pcf85363->dev = &client->dev; | |
349 | i2c_set_clientdata(client, pcf85363); | |
350 | ||
351 | pcf85363->rtc = devm_rtc_allocate_device(pcf85363->dev); | |
352 | if (IS_ERR(pcf85363->rtc)) | |
353 | return PTR_ERR(pcf85363->rtc); | |
354 | ||
a9687aa2 EN |
355 | pcf85363->rtc->ops = &rtc_ops; |
356 | ||
e5aac267 AB |
357 | if (client->irq > 0) { |
358 | regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); | |
359 | regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, | |
360 | PIN_IO_INTA_OUT, PIN_IO_INTAPM); | |
361 | ret = devm_request_threaded_irq(pcf85363->dev, client->irq, | |
362 | NULL, pcf85363_rtc_handle_irq, | |
363 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
364 | "pcf85363", client); | |
365 | if (ret) | |
366 | dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
367 | else | |
368 | pcf85363->rtc->ops = &rtc_ops_alarm; | |
369 | } | |
370 | ||
24849d17 AB |
371 | ret = rtc_register_device(pcf85363->rtc); |
372 | ||
0e7a412f AB |
373 | nvmem_cfg.priv = pcf85363; |
374 | rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg); | |
24849d17 AB |
375 | |
376 | return ret; | |
a9687aa2 EN |
377 | } |
378 | ||
379 | static const struct of_device_id dev_ids[] = { | |
380 | { .compatible = "nxp,pcf85363" }, | |
381 | {} | |
382 | }; | |
383 | MODULE_DEVICE_TABLE(of, dev_ids); | |
384 | ||
385 | static struct i2c_driver pcf85363_driver = { | |
386 | .driver = { | |
387 | .name = "pcf85363", | |
388 | .of_match_table = of_match_ptr(dev_ids), | |
389 | }, | |
390 | .probe = pcf85363_probe, | |
391 | }; | |
392 | ||
393 | module_i2c_driver(pcf85363_driver); | |
394 | ||
395 | MODULE_AUTHOR("Eric Nelson"); | |
396 | MODULE_DESCRIPTION("pcf85363 I2C RTC driver"); | |
397 | MODULE_LICENSE("GPL"); |