Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
18cb6368 | 2 | /* |
cee2cc21 | 3 | * An I2C and SPI driver for the NXP PCF2127/29 RTC |
18cb6368 RC |
4 | * Copyright 2013 Til-Technologies |
5 | * | |
6 | * Author: Renaud Cerrato <r.cerrato@til-technologies.fr> | |
7 | * | |
0e735eaa BT |
8 | * Watchdog and tamper functions |
9 | * Author: Bruno Thomsen <bruno.thomsen@gmail.com> | |
10 | * | |
18cb6368 RC |
11 | * based on the other drivers in this same directory. |
12 | * | |
cee2cc21 | 13 | * Datasheet: http://cache.nxp.com/documents/data_sheet/PCF2127.pdf |
18cb6368 RC |
14 | */ |
15 | ||
16 | #include <linux/i2c.h> | |
9408ec1a | 17 | #include <linux/spi/spi.h> |
18cb6368 RC |
18 | #include <linux/bcd.h> |
19 | #include <linux/rtc.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/of.h> | |
8a914bac | 23 | #include <linux/of_irq.h> |
907b3262 | 24 | #include <linux/regmap.h> |
0e735eaa | 25 | #include <linux/watchdog.h> |
18cb6368 | 26 | |
bbfe3a7a BT |
27 | /* Control register 1 */ |
28 | #define PCF2127_REG_CTRL1 0x00 | |
03623b4b | 29 | #define PCF2127_BIT_CTRL1_TSF1 BIT(4) |
bbfe3a7a BT |
30 | /* Control register 2 */ |
31 | #define PCF2127_REG_CTRL2 0x01 | |
8a914bac | 32 | #define PCF2127_BIT_CTRL2_AIE BIT(1) |
03623b4b | 33 | #define PCF2127_BIT_CTRL2_TSIE BIT(2) |
8a914bac | 34 | #define PCF2127_BIT_CTRL2_AF BIT(4) |
03623b4b | 35 | #define PCF2127_BIT_CTRL2_TSF2 BIT(5) |
27006416 | 36 | #define PCF2127_BIT_CTRL2_WDTF BIT(6) |
bbfe3a7a BT |
37 | /* Control register 3 */ |
38 | #define PCF2127_REG_CTRL3 0x02 | |
03623b4b BT |
39 | #define PCF2127_BIT_CTRL3_BLIE BIT(0) |
40 | #define PCF2127_BIT_CTRL3_BIE BIT(1) | |
bbfe3a7a | 41 | #define PCF2127_BIT_CTRL3_BLF BIT(2) |
03623b4b BT |
42 | #define PCF2127_BIT_CTRL3_BF BIT(3) |
43 | #define PCF2127_BIT_CTRL3_BTSE BIT(4) | |
bbfe3a7a BT |
44 | /* Time and date registers */ |
45 | #define PCF2127_REG_SC 0x03 | |
46 | #define PCF2127_BIT_SC_OSF BIT(7) | |
47 | #define PCF2127_REG_MN 0x04 | |
48 | #define PCF2127_REG_HR 0x05 | |
49 | #define PCF2127_REG_DM 0x06 | |
50 | #define PCF2127_REG_DW 0x07 | |
51 | #define PCF2127_REG_MO 0x08 | |
52 | #define PCF2127_REG_YR 0x09 | |
8a914bac LB |
53 | /* Alarm registers */ |
54 | #define PCF2127_REG_ALARM_SC 0x0A | |
55 | #define PCF2127_REG_ALARM_MN 0x0B | |
56 | #define PCF2127_REG_ALARM_HR 0x0C | |
57 | #define PCF2127_REG_ALARM_DM 0x0D | |
58 | #define PCF2127_REG_ALARM_DW 0x0E | |
27006416 | 59 | #define PCF2127_BIT_ALARM_AE BIT(7) |
0e735eaa BT |
60 | /* Watchdog registers */ |
61 | #define PCF2127_REG_WD_CTL 0x10 | |
62 | #define PCF2127_BIT_WD_CTL_TF0 BIT(0) | |
63 | #define PCF2127_BIT_WD_CTL_TF1 BIT(1) | |
64 | #define PCF2127_BIT_WD_CTL_CD0 BIT(6) | |
65 | #define PCF2127_BIT_WD_CTL_CD1 BIT(7) | |
66 | #define PCF2127_REG_WD_VAL 0x11 | |
03623b4b BT |
67 | /* Tamper timestamp registers */ |
68 | #define PCF2127_REG_TS_CTRL 0x12 | |
69 | #define PCF2127_BIT_TS_CTRL_TSOFF BIT(6) | |
70 | #define PCF2127_BIT_TS_CTRL_TSM BIT(7) | |
71 | #define PCF2127_REG_TS_SC 0x13 | |
72 | #define PCF2127_REG_TS_MN 0x14 | |
73 | #define PCF2127_REG_TS_HR 0x15 | |
74 | #define PCF2127_REG_TS_DM 0x16 | |
75 | #define PCF2127_REG_TS_MO 0x17 | |
76 | #define PCF2127_REG_TS_YR 0x18 | |
bbfe3a7a BT |
77 | /* |
78 | * RAM registers | |
79 | * PCF2127 has 512 bytes general-purpose static RAM (SRAM) that is | |
80 | * battery backed and can survive a power outage. | |
81 | * PCF2129 doesn't have this feature. | |
82 | */ | |
83 | #define PCF2127_REG_RAM_ADDR_MSB 0x1A | |
84 | #define PCF2127_REG_RAM_WRT_CMD 0x1C | |
85 | #define PCF2127_REG_RAM_RD_CMD 0x1D | |
d6c3029f | 86 | |
0e735eaa BT |
87 | /* Watchdog timer value constants */ |
88 | #define PCF2127_WD_VAL_STOP 0 | |
89 | #define PCF2127_WD_VAL_MIN 2 | |
90 | #define PCF2127_WD_VAL_MAX 255 | |
91 | #define PCF2127_WD_VAL_DEFAULT 60 | |
653ebd75 | 92 | |
18cb6368 RC |
93 | struct pcf2127 { |
94 | struct rtc_device *rtc; | |
0e735eaa | 95 | struct watchdog_device wdd; |
907b3262 | 96 | struct regmap *regmap; |
18cb6368 RC |
97 | }; |
98 | ||
99 | /* | |
100 | * In the routines that deal directly with the pcf2127 hardware, we use | |
101 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. | |
102 | */ | |
907b3262 | 103 | static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm) |
18cb6368 | 104 | { |
907b3262 AM |
105 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); |
106 | unsigned char buf[10]; | |
107 | int ret; | |
18cb6368 | 108 | |
7f43020e BT |
109 | /* |
110 | * Avoid reading CTRL2 register as it causes WD_VAL register | |
111 | * value to reset to 0 which means watchdog is stopped. | |
112 | */ | |
113 | ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL3, | |
114 | (buf + PCF2127_REG_CTRL3), | |
115 | ARRAY_SIZE(buf) - PCF2127_REG_CTRL3); | |
907b3262 AM |
116 | if (ret) { |
117 | dev_err(dev, "%s: read error\n", __func__); | |
118 | return ret; | |
18cb6368 RC |
119 | } |
120 | ||
bbfe3a7a | 121 | if (buf[PCF2127_REG_CTRL3] & PCF2127_BIT_CTRL3_BLF) |
907b3262 | 122 | dev_info(dev, |
653ebd75 | 123 | "low voltage detected, check/replace RTC battery.\n"); |
653ebd75 | 124 | |
bbfe3a7a BT |
125 | /* Clock integrity is not guaranteed when OSF flag is set. */ |
126 | if (buf[PCF2127_REG_SC] & PCF2127_BIT_SC_OSF) { | |
653ebd75 AS |
127 | /* |
128 | * no need clear the flag here, | |
129 | * it will be cleared once the new date is saved | |
130 | */ | |
907b3262 | 131 | dev_warn(dev, |
653ebd75 AS |
132 | "oscillator stop detected, date/time is not reliable\n"); |
133 | return -EINVAL; | |
18cb6368 RC |
134 | } |
135 | ||
907b3262 | 136 | dev_dbg(dev, |
7f43020e | 137 | "%s: raw data is cr3=%02x, sec=%02x, min=%02x, hr=%02x, " |
18cb6368 | 138 | "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", |
7f43020e BT |
139 | __func__, buf[PCF2127_REG_CTRL3], buf[PCF2127_REG_SC], |
140 | buf[PCF2127_REG_MN], buf[PCF2127_REG_HR], | |
141 | buf[PCF2127_REG_DM], buf[PCF2127_REG_DW], | |
142 | buf[PCF2127_REG_MO], buf[PCF2127_REG_YR]); | |
18cb6368 RC |
143 | |
144 | tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F); | |
145 | tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F); | |
146 | tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); /* rtc hr 0-23 */ | |
147 | tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F); | |
148 | tm->tm_wday = buf[PCF2127_REG_DW] & 0x07; | |
149 | tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ | |
150 | tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]); | |
b139bb5c | 151 | tm->tm_year += 100; |
18cb6368 | 152 | |
907b3262 | 153 | dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
18cb6368 RC |
154 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
155 | __func__, | |
156 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
157 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
158 | ||
22652ba7 | 159 | return 0; |
18cb6368 RC |
160 | } |
161 | ||
907b3262 | 162 | static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm) |
18cb6368 | 163 | { |
907b3262 AM |
164 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); |
165 | unsigned char buf[7]; | |
18cb6368 RC |
166 | int i = 0, err; |
167 | ||
907b3262 | 168 | dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, " |
18cb6368 RC |
169 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
170 | __func__, | |
171 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
172 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
173 | ||
18cb6368 | 174 | /* hours, minutes and seconds */ |
653ebd75 | 175 | buf[i++] = bin2bcd(tm->tm_sec); /* this will also clear OSF flag */ |
18cb6368 RC |
176 | buf[i++] = bin2bcd(tm->tm_min); |
177 | buf[i++] = bin2bcd(tm->tm_hour); | |
178 | buf[i++] = bin2bcd(tm->tm_mday); | |
179 | buf[i++] = tm->tm_wday & 0x07; | |
180 | ||
181 | /* month, 1 - 12 */ | |
182 | buf[i++] = bin2bcd(tm->tm_mon + 1); | |
183 | ||
184 | /* year */ | |
b139bb5c | 185 | buf[i++] = bin2bcd(tm->tm_year - 100); |
18cb6368 RC |
186 | |
187 | /* write register's data */ | |
907b3262 AM |
188 | err = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_SC, buf, i); |
189 | if (err) { | |
190 | dev_err(dev, | |
18cb6368 | 191 | "%s: err=%d", __func__, err); |
907b3262 | 192 | return err; |
18cb6368 RC |
193 | } |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
18cb6368 RC |
198 | static int pcf2127_rtc_ioctl(struct device *dev, |
199 | unsigned int cmd, unsigned long arg) | |
200 | { | |
907b3262 | 201 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); |
7d65cf8c | 202 | int val, touser = 0; |
f97cfddc | 203 | int ret; |
18cb6368 RC |
204 | |
205 | switch (cmd) { | |
206 | case RTC_VL_READ: | |
7d65cf8c | 207 | ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &val); |
907b3262 | 208 | if (ret) |
f97cfddc UKK |
209 | return ret; |
210 | ||
7d65cf8c AB |
211 | if (val & PCF2127_BIT_CTRL3_BLF) |
212 | touser |= RTC_VL_BACKUP_LOW; | |
213 | ||
214 | if (val & PCF2127_BIT_CTRL3_BF) | |
215 | touser |= RTC_VL_BACKUP_SWITCH; | |
18cb6368 | 216 | |
af427311 | 217 | return put_user(touser, (unsigned int __user *)arg); |
7d65cf8c AB |
218 | |
219 | case RTC_VL_CLR: | |
220 | return regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3, | |
221 | PCF2127_BIT_CTRL3_BF, 0); | |
222 | ||
18cb6368 RC |
223 | default: |
224 | return -ENOIOCTLCMD; | |
225 | } | |
226 | } | |
18cb6368 | 227 | |
18cb6368 RC |
228 | static const struct rtc_class_ops pcf2127_rtc_ops = { |
229 | .ioctl = pcf2127_rtc_ioctl, | |
230 | .read_time = pcf2127_rtc_read_time, | |
231 | .set_time = pcf2127_rtc_set_time, | |
232 | }; | |
233 | ||
d6c3029f UKK |
234 | static int pcf2127_nvmem_read(void *priv, unsigned int offset, |
235 | void *val, size_t bytes) | |
236 | { | |
237 | struct pcf2127 *pcf2127 = priv; | |
238 | int ret; | |
239 | unsigned char offsetbuf[] = { offset >> 8, offset }; | |
240 | ||
bbfe3a7a | 241 | ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB, |
d6c3029f UKK |
242 | offsetbuf, 2); |
243 | if (ret) | |
244 | return ret; | |
245 | ||
bbfe3a7a | 246 | ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_RD_CMD, |
d6c3029f UKK |
247 | val, bytes); |
248 | ||
249 | return ret ?: bytes; | |
250 | } | |
251 | ||
252 | static int pcf2127_nvmem_write(void *priv, unsigned int offset, | |
253 | void *val, size_t bytes) | |
254 | { | |
255 | struct pcf2127 *pcf2127 = priv; | |
256 | int ret; | |
257 | unsigned char offsetbuf[] = { offset >> 8, offset }; | |
258 | ||
bbfe3a7a | 259 | ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB, |
d6c3029f UKK |
260 | offsetbuf, 2); |
261 | if (ret) | |
262 | return ret; | |
263 | ||
bbfe3a7a | 264 | ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_WRT_CMD, |
d6c3029f UKK |
265 | val, bytes); |
266 | ||
267 | return ret ?: bytes; | |
268 | } | |
269 | ||
0e735eaa BT |
270 | /* watchdog driver */ |
271 | ||
272 | static int pcf2127_wdt_ping(struct watchdog_device *wdd) | |
273 | { | |
274 | struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd); | |
275 | ||
276 | return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL, wdd->timeout); | |
277 | } | |
278 | ||
279 | /* | |
280 | * Restart watchdog timer if feature is active. | |
281 | * | |
282 | * Note: Reading CTRL2 register causes watchdog to stop which is unfortunate, | |
283 | * since register also contain control/status flags for other features. | |
284 | * Always call this function after reading CTRL2 register. | |
285 | */ | |
286 | static int pcf2127_wdt_active_ping(struct watchdog_device *wdd) | |
287 | { | |
288 | int ret = 0; | |
289 | ||
290 | if (watchdog_active(wdd)) { | |
291 | ret = pcf2127_wdt_ping(wdd); | |
292 | if (ret) | |
293 | dev_err(wdd->parent, | |
294 | "%s: watchdog restart failed, ret=%d\n", | |
295 | __func__, ret); | |
296 | } | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
301 | static int pcf2127_wdt_start(struct watchdog_device *wdd) | |
302 | { | |
303 | return pcf2127_wdt_ping(wdd); | |
304 | } | |
305 | ||
306 | static int pcf2127_wdt_stop(struct watchdog_device *wdd) | |
307 | { | |
308 | struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd); | |
309 | ||
310 | return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL, | |
311 | PCF2127_WD_VAL_STOP); | |
312 | } | |
313 | ||
314 | static int pcf2127_wdt_set_timeout(struct watchdog_device *wdd, | |
315 | unsigned int new_timeout) | |
316 | { | |
317 | dev_dbg(wdd->parent, "new watchdog timeout: %is (old: %is)\n", | |
318 | new_timeout, wdd->timeout); | |
319 | ||
320 | wdd->timeout = new_timeout; | |
321 | ||
322 | return pcf2127_wdt_active_ping(wdd); | |
323 | } | |
324 | ||
325 | static const struct watchdog_info pcf2127_wdt_info = { | |
326 | .identity = "NXP PCF2127/PCF2129 Watchdog", | |
327 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, | |
328 | }; | |
329 | ||
330 | static const struct watchdog_ops pcf2127_watchdog_ops = { | |
331 | .owner = THIS_MODULE, | |
332 | .start = pcf2127_wdt_start, | |
333 | .stop = pcf2127_wdt_stop, | |
334 | .ping = pcf2127_wdt_ping, | |
335 | .set_timeout = pcf2127_wdt_set_timeout, | |
336 | }; | |
337 | ||
8a914bac LB |
338 | /* Alarm */ |
339 | static int pcf2127_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
340 | { | |
341 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); | |
342 | unsigned int buf[5], ctrl2; | |
343 | int ret; | |
344 | ||
345 | ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | ret = pcf2127_wdt_active_ping(&pcf2127->wdd); | |
350 | if (ret) | |
351 | return ret; | |
352 | ||
353 | ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf, | |
354 | sizeof(buf)); | |
355 | if (ret) | |
356 | return ret; | |
357 | ||
358 | alrm->enabled = ctrl2 & PCF2127_BIT_CTRL2_AIE; | |
359 | alrm->pending = ctrl2 & PCF2127_BIT_CTRL2_AF; | |
360 | ||
361 | alrm->time.tm_sec = bcd2bin(buf[0] & 0x7F); | |
362 | alrm->time.tm_min = bcd2bin(buf[1] & 0x7F); | |
363 | alrm->time.tm_hour = bcd2bin(buf[2] & 0x3F); | |
364 | alrm->time.tm_mday = bcd2bin(buf[3] & 0x3F); | |
8a914bac LB |
365 | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static int pcf2127_rtc_alarm_irq_enable(struct device *dev, u32 enable) | |
370 | { | |
371 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); | |
372 | int ret; | |
373 | ||
374 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2, | |
375 | PCF2127_BIT_CTRL2_AIE, | |
376 | enable ? PCF2127_BIT_CTRL2_AIE : 0); | |
377 | if (ret) | |
378 | return ret; | |
379 | ||
380 | return pcf2127_wdt_active_ping(&pcf2127->wdd); | |
381 | } | |
382 | ||
383 | static int pcf2127_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
384 | { | |
385 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); | |
386 | uint8_t buf[5]; | |
387 | int ret; | |
388 | ||
389 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2, | |
390 | PCF2127_BIT_CTRL2_AF, 0); | |
391 | if (ret) | |
392 | return ret; | |
393 | ||
394 | ret = pcf2127_wdt_active_ping(&pcf2127->wdd); | |
395 | if (ret) | |
396 | return ret; | |
397 | ||
398 | buf[0] = bin2bcd(alrm->time.tm_sec); | |
399 | buf[1] = bin2bcd(alrm->time.tm_min); | |
400 | buf[2] = bin2bcd(alrm->time.tm_hour); | |
401 | buf[3] = bin2bcd(alrm->time.tm_mday); | |
27006416 | 402 | buf[4] = PCF2127_BIT_ALARM_AE; /* Do not match on week day */ |
8a914bac LB |
403 | |
404 | ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf, | |
405 | sizeof(buf)); | |
406 | if (ret) | |
407 | return ret; | |
408 | ||
409 | return pcf2127_rtc_alarm_irq_enable(dev, alrm->enabled); | |
410 | } | |
411 | ||
412 | static irqreturn_t pcf2127_rtc_irq(int irq, void *dev) | |
413 | { | |
414 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev); | |
415 | unsigned int ctrl2 = 0; | |
416 | int ret = 0; | |
417 | ||
418 | ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2); | |
419 | if (ret) | |
420 | return IRQ_NONE; | |
421 | ||
27006416 AB |
422 | if (!(ctrl2 & PCF2127_BIT_CTRL2_AF)) |
423 | return IRQ_NONE; | |
8a914bac | 424 | |
27006416 AB |
425 | regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2, |
426 | ctrl2 & ~(PCF2127_BIT_CTRL2_AF | PCF2127_BIT_CTRL2_WDTF)); | |
8a914bac | 427 | |
27006416 AB |
428 | rtc_update_irq(pcf2127->rtc, 1, RTC_IRQF | RTC_AF); |
429 | ||
430 | pcf2127_wdt_active_ping(&pcf2127->wdd); | |
8a914bac LB |
431 | |
432 | return IRQ_HANDLED; | |
433 | } | |
434 | ||
435 | static const struct rtc_class_ops pcf2127_rtc_alrm_ops = { | |
436 | .ioctl = pcf2127_rtc_ioctl, | |
437 | .read_time = pcf2127_rtc_read_time, | |
438 | .set_time = pcf2127_rtc_set_time, | |
439 | .read_alarm = pcf2127_rtc_read_alarm, | |
440 | .set_alarm = pcf2127_rtc_set_alarm, | |
441 | .alarm_irq_enable = pcf2127_rtc_alarm_irq_enable, | |
442 | }; | |
443 | ||
03623b4b BT |
444 | /* sysfs interface */ |
445 | ||
446 | static ssize_t timestamp0_store(struct device *dev, | |
447 | struct device_attribute *attr, | |
448 | const char *buf, size_t count) | |
449 | { | |
450 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent); | |
451 | int ret; | |
452 | ||
453 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1, | |
454 | PCF2127_BIT_CTRL1_TSF1, 0); | |
455 | if (ret) { | |
456 | dev_err(dev, "%s: update ctrl1 ret=%d\n", __func__, ret); | |
457 | return ret; | |
458 | } | |
459 | ||
460 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2, | |
461 | PCF2127_BIT_CTRL2_TSF2, 0); | |
462 | if (ret) { | |
463 | dev_err(dev, "%s: update ctrl2 ret=%d\n", __func__, ret); | |
464 | return ret; | |
465 | } | |
466 | ||
467 | ret = pcf2127_wdt_active_ping(&pcf2127->wdd); | |
468 | if (ret) | |
469 | return ret; | |
470 | ||
471 | return count; | |
472 | }; | |
473 | ||
474 | static ssize_t timestamp0_show(struct device *dev, | |
475 | struct device_attribute *attr, char *buf) | |
476 | { | |
477 | struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent); | |
478 | struct rtc_time tm; | |
479 | int ret; | |
480 | unsigned char data[25]; | |
481 | ||
482 | ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, data, | |
483 | sizeof(data)); | |
484 | if (ret) { | |
485 | dev_err(dev, "%s: read error ret=%d\n", __func__, ret); | |
486 | return ret; | |
487 | } | |
488 | ||
489 | dev_dbg(dev, | |
490 | "%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, ts_sc=%02x, " | |
491 | "ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n", | |
492 | __func__, data[PCF2127_REG_CTRL1], data[PCF2127_REG_CTRL2], | |
493 | data[PCF2127_REG_CTRL3], data[PCF2127_REG_TS_SC], | |
494 | data[PCF2127_REG_TS_MN], data[PCF2127_REG_TS_HR], | |
495 | data[PCF2127_REG_TS_DM], data[PCF2127_REG_TS_MO], | |
496 | data[PCF2127_REG_TS_YR]); | |
497 | ||
498 | ret = pcf2127_wdt_active_ping(&pcf2127->wdd); | |
499 | if (ret) | |
500 | return ret; | |
501 | ||
502 | if (!(data[PCF2127_REG_CTRL1] & PCF2127_BIT_CTRL1_TSF1) && | |
503 | !(data[PCF2127_REG_CTRL2] & PCF2127_BIT_CTRL2_TSF2)) | |
504 | return 0; | |
505 | ||
506 | tm.tm_sec = bcd2bin(data[PCF2127_REG_TS_SC] & 0x7F); | |
507 | tm.tm_min = bcd2bin(data[PCF2127_REG_TS_MN] & 0x7F); | |
508 | tm.tm_hour = bcd2bin(data[PCF2127_REG_TS_HR] & 0x3F); | |
509 | tm.tm_mday = bcd2bin(data[PCF2127_REG_TS_DM] & 0x3F); | |
510 | /* TS_MO register (month) value range: 1-12 */ | |
511 | tm.tm_mon = bcd2bin(data[PCF2127_REG_TS_MO] & 0x1F) - 1; | |
512 | tm.tm_year = bcd2bin(data[PCF2127_REG_TS_YR]); | |
513 | if (tm.tm_year < 70) | |
514 | tm.tm_year += 100; /* assume we are in 1970...2069 */ | |
515 | ||
516 | ret = rtc_valid_tm(&tm); | |
517 | if (ret) | |
518 | return ret; | |
519 | ||
520 | return sprintf(buf, "%llu\n", | |
521 | (unsigned long long)rtc_tm_to_time64(&tm)); | |
522 | }; | |
523 | ||
524 | static DEVICE_ATTR_RW(timestamp0); | |
525 | ||
526 | static struct attribute *pcf2127_attrs[] = { | |
527 | &dev_attr_timestamp0.attr, | |
528 | NULL | |
529 | }; | |
530 | ||
531 | static const struct attribute_group pcf2127_attr_group = { | |
532 | .attrs = pcf2127_attrs, | |
533 | }; | |
534 | ||
907b3262 | 535 | static int pcf2127_probe(struct device *dev, struct regmap *regmap, |
27006416 | 536 | int alarm_irq, const char *name, bool has_nvmem) |
18cb6368 RC |
537 | { |
538 | struct pcf2127 *pcf2127; | |
62409933 | 539 | u32 wdd_timeout; |
d6c3029f | 540 | int ret = 0; |
18cb6368 | 541 | |
907b3262 | 542 | dev_dbg(dev, "%s\n", __func__); |
18cb6368 | 543 | |
907b3262 | 544 | pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL); |
18cb6368 RC |
545 | if (!pcf2127) |
546 | return -ENOMEM; | |
547 | ||
907b3262 | 548 | pcf2127->regmap = regmap; |
18cb6368 | 549 | |
907b3262 AM |
550 | dev_set_drvdata(dev, pcf2127); |
551 | ||
e788771c | 552 | pcf2127->rtc = devm_rtc_allocate_device(dev); |
d6c3029f UKK |
553 | if (IS_ERR(pcf2127->rtc)) |
554 | return PTR_ERR(pcf2127->rtc); | |
555 | ||
e788771c | 556 | pcf2127->rtc->ops = &pcf2127_rtc_ops; |
b139bb5c AB |
557 | pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
558 | pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099; | |
559 | pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */ | |
27006416 | 560 | pcf2127->rtc->uie_unsupported = 1; |
e788771c | 561 | |
35425baf | 562 | if (alarm_irq > 0) { |
27006416 AB |
563 | ret = devm_request_threaded_irq(dev, alarm_irq, NULL, |
564 | pcf2127_rtc_irq, | |
565 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
566 | dev_name(dev), dev); | |
8a914bac LB |
567 | if (ret) { |
568 | dev_err(dev, "failed to request alarm irq\n"); | |
569 | return ret; | |
570 | } | |
571 | } | |
572 | ||
35425baf | 573 | if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) { |
8a914bac LB |
574 | device_init_wakeup(dev, true); |
575 | pcf2127->rtc->ops = &pcf2127_rtc_alrm_ops; | |
576 | } | |
577 | ||
0e735eaa BT |
578 | pcf2127->wdd.parent = dev; |
579 | pcf2127->wdd.info = &pcf2127_wdt_info; | |
580 | pcf2127->wdd.ops = &pcf2127_watchdog_ops; | |
581 | pcf2127->wdd.min_timeout = PCF2127_WD_VAL_MIN; | |
582 | pcf2127->wdd.max_timeout = PCF2127_WD_VAL_MAX; | |
583 | pcf2127->wdd.timeout = PCF2127_WD_VAL_DEFAULT; | |
584 | pcf2127->wdd.min_hw_heartbeat_ms = 500; | |
4601e24a | 585 | pcf2127->wdd.status = WATCHDOG_NOWAYOUT_INIT_STATUS; |
0e735eaa BT |
586 | |
587 | watchdog_set_drvdata(&pcf2127->wdd, pcf2127); | |
588 | ||
d6c3029f UKK |
589 | if (has_nvmem) { |
590 | struct nvmem_config nvmem_cfg = { | |
591 | .priv = pcf2127, | |
592 | .reg_read = pcf2127_nvmem_read, | |
593 | .reg_write = pcf2127_nvmem_write, | |
594 | .size = 512, | |
595 | }; | |
596 | ||
597 | ret = rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg); | |
598 | } | |
18cb6368 | 599 | |
0e735eaa BT |
600 | /* |
601 | * Watchdog timer enabled and reset pin /RST activated when timed out. | |
602 | * Select 1Hz clock source for watchdog timer. | |
0e735eaa BT |
603 | * Note: Countdown timer disabled and not available. |
604 | */ | |
605 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL, | |
606 | PCF2127_BIT_WD_CTL_CD1 | | |
607 | PCF2127_BIT_WD_CTL_CD0 | | |
608 | PCF2127_BIT_WD_CTL_TF1 | | |
609 | PCF2127_BIT_WD_CTL_TF0, | |
610 | PCF2127_BIT_WD_CTL_CD1 | | |
611 | PCF2127_BIT_WD_CTL_CD0 | | |
612 | PCF2127_BIT_WD_CTL_TF1); | |
613 | if (ret) { | |
614 | dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__); | |
615 | return ret; | |
616 | } | |
617 | ||
62409933 MH |
618 | /* Test if watchdog timer is started by bootloader */ |
619 | ret = regmap_read(pcf2127->regmap, PCF2127_REG_WD_VAL, &wdd_timeout); | |
620 | if (ret) | |
621 | return ret; | |
622 | ||
623 | if (wdd_timeout) | |
624 | set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status); | |
625 | ||
28abbba3 | 626 | #ifdef CONFIG_WATCHDOG |
0e735eaa BT |
627 | ret = devm_watchdog_register_device(dev, &pcf2127->wdd); |
628 | if (ret) | |
629 | return ret; | |
28abbba3 | 630 | #endif /* CONFIG_WATCHDOG */ |
0e735eaa | 631 | |
03623b4b BT |
632 | /* |
633 | * Disable battery low/switch-over timestamp and interrupts. | |
634 | * Clear battery interrupt flags which can block new trigger events. | |
635 | * Note: This is the default chip behaviour but added to ensure | |
636 | * correct tamper timestamp and interrupt function. | |
637 | */ | |
638 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3, | |
639 | PCF2127_BIT_CTRL3_BTSE | | |
03623b4b BT |
640 | PCF2127_BIT_CTRL3_BIE | |
641 | PCF2127_BIT_CTRL3_BLIE, 0); | |
642 | if (ret) { | |
643 | dev_err(dev, "%s: interrupt config (ctrl3) failed\n", | |
644 | __func__); | |
645 | return ret; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Enable timestamp function and store timestamp of first trigger | |
650 | * event until TSF1 and TFS2 interrupt flags are cleared. | |
651 | */ | |
652 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_TS_CTRL, | |
653 | PCF2127_BIT_TS_CTRL_TSOFF | | |
654 | PCF2127_BIT_TS_CTRL_TSM, | |
655 | PCF2127_BIT_TS_CTRL_TSM); | |
656 | if (ret) { | |
657 | dev_err(dev, "%s: tamper detection config (ts_ctrl) failed\n", | |
658 | __func__); | |
659 | return ret; | |
660 | } | |
661 | ||
662 | /* | |
663 | * Enable interrupt generation when TSF1 or TSF2 timestamp flags | |
664 | * are set. Interrupt signal is an open-drain output and can be | |
665 | * left floating if unused. | |
666 | */ | |
667 | ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2, | |
668 | PCF2127_BIT_CTRL2_TSIE, | |
669 | PCF2127_BIT_CTRL2_TSIE); | |
670 | if (ret) { | |
671 | dev_err(dev, "%s: tamper detection config (ctrl2) failed\n", | |
672 | __func__); | |
673 | return ret; | |
674 | } | |
675 | ||
676 | ret = rtc_add_group(pcf2127->rtc, &pcf2127_attr_group); | |
677 | if (ret) { | |
678 | dev_err(dev, "%s: tamper sysfs registering failed\n", | |
679 | __func__); | |
680 | return ret; | |
681 | } | |
682 | ||
e788771c | 683 | return rtc_register_device(pcf2127->rtc); |
18cb6368 RC |
684 | } |
685 | ||
18cb6368 RC |
686 | #ifdef CONFIG_OF |
687 | static const struct of_device_id pcf2127_of_match[] = { | |
688 | { .compatible = "nxp,pcf2127" }, | |
cee2cc21 | 689 | { .compatible = "nxp,pcf2129" }, |
985b30db | 690 | { .compatible = "nxp,pca2129" }, |
18cb6368 RC |
691 | {} |
692 | }; | |
693 | MODULE_DEVICE_TABLE(of, pcf2127_of_match); | |
694 | #endif | |
695 | ||
9408ec1a AM |
696 | #if IS_ENABLED(CONFIG_I2C) |
697 | ||
907b3262 AM |
698 | static int pcf2127_i2c_write(void *context, const void *data, size_t count) |
699 | { | |
700 | struct device *dev = context; | |
701 | struct i2c_client *client = to_i2c_client(dev); | |
702 | int ret; | |
703 | ||
704 | ret = i2c_master_send(client, data, count); | |
705 | if (ret != count) | |
706 | return ret < 0 ? ret : -EIO; | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static int pcf2127_i2c_gather_write(void *context, | |
712 | const void *reg, size_t reg_size, | |
713 | const void *val, size_t val_size) | |
714 | { | |
715 | struct device *dev = context; | |
716 | struct i2c_client *client = to_i2c_client(dev); | |
717 | int ret; | |
718 | void *buf; | |
719 | ||
720 | if (WARN_ON(reg_size != 1)) | |
721 | return -EINVAL; | |
722 | ||
723 | buf = kmalloc(val_size + 1, GFP_KERNEL); | |
724 | if (!buf) | |
725 | return -ENOMEM; | |
726 | ||
727 | memcpy(buf, reg, 1); | |
728 | memcpy(buf + 1, val, val_size); | |
729 | ||
730 | ret = i2c_master_send(client, buf, val_size + 1); | |
9bde0afb XS |
731 | |
732 | kfree(buf); | |
733 | ||
907b3262 AM |
734 | if (ret != val_size + 1) |
735 | return ret < 0 ? ret : -EIO; | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
740 | static int pcf2127_i2c_read(void *context, const void *reg, size_t reg_size, | |
741 | void *val, size_t val_size) | |
742 | { | |
743 | struct device *dev = context; | |
744 | struct i2c_client *client = to_i2c_client(dev); | |
745 | int ret; | |
746 | ||
747 | if (WARN_ON(reg_size != 1)) | |
748 | return -EINVAL; | |
749 | ||
750 | ret = i2c_master_send(client, reg, 1); | |
751 | if (ret != 1) | |
752 | return ret < 0 ? ret : -EIO; | |
753 | ||
754 | ret = i2c_master_recv(client, val, val_size); | |
755 | if (ret != val_size) | |
756 | return ret < 0 ? ret : -EIO; | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
761 | /* | |
762 | * The reason we need this custom regmap_bus instead of using regmap_init_i2c() | |
763 | * is that the STOP condition is required between set register address and | |
764 | * read register data when reading from registers. | |
765 | */ | |
766 | static const struct regmap_bus pcf2127_i2c_regmap = { | |
767 | .write = pcf2127_i2c_write, | |
768 | .gather_write = pcf2127_i2c_gather_write, | |
769 | .read = pcf2127_i2c_read, | |
770 | }; | |
771 | ||
772 | static struct i2c_driver pcf2127_i2c_driver; | |
773 | ||
774 | static int pcf2127_i2c_probe(struct i2c_client *client, | |
775 | const struct i2c_device_id *id) | |
776 | { | |
777 | struct regmap *regmap; | |
778 | static const struct regmap_config config = { | |
779 | .reg_bits = 8, | |
780 | .val_bits = 8, | |
040e6dc0 | 781 | .max_register = 0x1d, |
907b3262 AM |
782 | }; |
783 | ||
784 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) | |
785 | return -ENODEV; | |
786 | ||
787 | regmap = devm_regmap_init(&client->dev, &pcf2127_i2c_regmap, | |
788 | &client->dev, &config); | |
789 | if (IS_ERR(regmap)) { | |
790 | dev_err(&client->dev, "%s: regmap allocation failed: %ld\n", | |
791 | __func__, PTR_ERR(regmap)); | |
792 | return PTR_ERR(regmap); | |
793 | } | |
794 | ||
27006416 | 795 | return pcf2127_probe(&client->dev, regmap, client->irq, |
d6c3029f | 796 | pcf2127_i2c_driver.driver.name, id->driver_data); |
907b3262 AM |
797 | } |
798 | ||
799 | static const struct i2c_device_id pcf2127_i2c_id[] = { | |
d6c3029f | 800 | { "pcf2127", 1 }, |
cee2cc21 | 801 | { "pcf2129", 0 }, |
985b30db | 802 | { "pca2129", 0 }, |
907b3262 AM |
803 | { } |
804 | }; | |
805 | MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id); | |
806 | ||
807 | static struct i2c_driver pcf2127_i2c_driver = { | |
18cb6368 | 808 | .driver = { |
907b3262 | 809 | .name = "rtc-pcf2127-i2c", |
18cb6368 RC |
810 | .of_match_table = of_match_ptr(pcf2127_of_match), |
811 | }, | |
907b3262 AM |
812 | .probe = pcf2127_i2c_probe, |
813 | .id_table = pcf2127_i2c_id, | |
18cb6368 | 814 | }; |
9408ec1a AM |
815 | |
816 | static int pcf2127_i2c_register_driver(void) | |
817 | { | |
818 | return i2c_add_driver(&pcf2127_i2c_driver); | |
819 | } | |
820 | ||
821 | static void pcf2127_i2c_unregister_driver(void) | |
822 | { | |
823 | i2c_del_driver(&pcf2127_i2c_driver); | |
824 | } | |
825 | ||
826 | #else | |
827 | ||
828 | static int pcf2127_i2c_register_driver(void) | |
829 | { | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static void pcf2127_i2c_unregister_driver(void) | |
834 | { | |
835 | } | |
836 | ||
837 | #endif | |
838 | ||
839 | #if IS_ENABLED(CONFIG_SPI_MASTER) | |
840 | ||
841 | static struct spi_driver pcf2127_spi_driver; | |
842 | ||
843 | static int pcf2127_spi_probe(struct spi_device *spi) | |
844 | { | |
845 | static const struct regmap_config config = { | |
846 | .reg_bits = 8, | |
847 | .val_bits = 8, | |
848 | .read_flag_mask = 0xa0, | |
849 | .write_flag_mask = 0x20, | |
040e6dc0 | 850 | .max_register = 0x1d, |
9408ec1a AM |
851 | }; |
852 | struct regmap *regmap; | |
853 | ||
854 | regmap = devm_regmap_init_spi(spi, &config); | |
855 | if (IS_ERR(regmap)) { | |
856 | dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n", | |
857 | __func__, PTR_ERR(regmap)); | |
858 | return PTR_ERR(regmap); | |
859 | } | |
860 | ||
27006416 AB |
861 | return pcf2127_probe(&spi->dev, regmap, spi->irq, |
862 | pcf2127_spi_driver.driver.name, | |
d6c3029f | 863 | spi_get_device_id(spi)->driver_data); |
9408ec1a AM |
864 | } |
865 | ||
866 | static const struct spi_device_id pcf2127_spi_id[] = { | |
d6c3029f | 867 | { "pcf2127", 1 }, |
cee2cc21 | 868 | { "pcf2129", 0 }, |
985b30db | 869 | { "pca2129", 0 }, |
9408ec1a AM |
870 | { } |
871 | }; | |
872 | MODULE_DEVICE_TABLE(spi, pcf2127_spi_id); | |
873 | ||
874 | static struct spi_driver pcf2127_spi_driver = { | |
875 | .driver = { | |
876 | .name = "rtc-pcf2127-spi", | |
877 | .of_match_table = of_match_ptr(pcf2127_of_match), | |
878 | }, | |
879 | .probe = pcf2127_spi_probe, | |
880 | .id_table = pcf2127_spi_id, | |
881 | }; | |
882 | ||
883 | static int pcf2127_spi_register_driver(void) | |
884 | { | |
885 | return spi_register_driver(&pcf2127_spi_driver); | |
886 | } | |
887 | ||
888 | static void pcf2127_spi_unregister_driver(void) | |
889 | { | |
890 | spi_unregister_driver(&pcf2127_spi_driver); | |
891 | } | |
892 | ||
893 | #else | |
894 | ||
895 | static int pcf2127_spi_register_driver(void) | |
896 | { | |
897 | return 0; | |
898 | } | |
899 | ||
900 | static void pcf2127_spi_unregister_driver(void) | |
901 | { | |
902 | } | |
903 | ||
904 | #endif | |
905 | ||
906 | static int __init pcf2127_init(void) | |
907 | { | |
908 | int ret; | |
909 | ||
910 | ret = pcf2127_i2c_register_driver(); | |
911 | if (ret) { | |
912 | pr_err("Failed to register pcf2127 i2c driver: %d\n", ret); | |
913 | return ret; | |
914 | } | |
915 | ||
916 | ret = pcf2127_spi_register_driver(); | |
917 | if (ret) { | |
918 | pr_err("Failed to register pcf2127 spi driver: %d\n", ret); | |
919 | pcf2127_i2c_unregister_driver(); | |
920 | } | |
921 | ||
922 | return ret; | |
923 | } | |
924 | module_init(pcf2127_init) | |
925 | ||
926 | static void __exit pcf2127_exit(void) | |
927 | { | |
928 | pcf2127_spi_unregister_driver(); | |
929 | pcf2127_i2c_unregister_driver(); | |
930 | } | |
931 | module_exit(pcf2127_exit) | |
18cb6368 RC |
932 | |
933 | MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>"); | |
cee2cc21 | 934 | MODULE_DESCRIPTION("NXP PCF2127/29 RTC driver"); |
4d8318bc | 935 | MODULE_LICENSE("GPL v2"); |