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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * An I2C and SPI driver for the NXP PCF2127/29/31 RTC
4 * Copyright 2013 Til-Technologies
5 *
6 * Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
7 *
8 * Watchdog and tamper functions
9 * Author: Bruno Thomsen <bruno.thomsen@gmail.com>
10 *
11 * PCF2131 support
12 * Author: Hugo Villeneuve <hvilleneuve@dimonoff.com>
13 *
14 * based on the other drivers in this same directory.
15 *
16 * Datasheets: https://www.nxp.com/docs/en/data-sheet/PCF2127.pdf
17 * https://www.nxp.com/docs/en/data-sheet/PCF2131DS.pdf
18 */
19
20#include <linux/i2c.h>
21#include <linux/spi/spi.h>
22#include <linux/bcd.h>
23#include <linux/rtc.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/of.h>
27#include <linux/of_irq.h>
28#include <linux/of_device.h>
29#include <linux/regmap.h>
30#include <linux/watchdog.h>
31
32/* Control register 1 */
33#define PCF2127_REG_CTRL1 0x00
34#define PCF2127_BIT_CTRL1_POR_OVRD BIT(3)
35#define PCF2127_BIT_CTRL1_TSF1 BIT(4)
36#define PCF2127_BIT_CTRL1_STOP BIT(5)
37/* Control register 2 */
38#define PCF2127_REG_CTRL2 0x01
39#define PCF2127_BIT_CTRL2_AIE BIT(1)
40#define PCF2127_BIT_CTRL2_TSIE BIT(2)
41#define PCF2127_BIT_CTRL2_AF BIT(4)
42#define PCF2127_BIT_CTRL2_TSF2 BIT(5)
43#define PCF2127_BIT_CTRL2_WDTF BIT(6)
44/* Control register 3 */
45#define PCF2127_REG_CTRL3 0x02
46#define PCF2127_BIT_CTRL3_BLIE BIT(0)
47#define PCF2127_BIT_CTRL3_BIE BIT(1)
48#define PCF2127_BIT_CTRL3_BLF BIT(2)
49#define PCF2127_BIT_CTRL3_BF BIT(3)
50#define PCF2127_BIT_CTRL3_BTSE BIT(4)
51/* Time and date registers */
52#define PCF2127_REG_TIME_BASE 0x03
53#define PCF2127_BIT_SC_OSF BIT(7)
54/* Alarm registers */
55#define PCF2127_REG_ALARM_BASE 0x0A
56#define PCF2127_BIT_ALARM_AE BIT(7)
57/* CLKOUT control register */
58#define PCF2127_REG_CLKOUT 0x0f
59#define PCF2127_BIT_CLKOUT_OTPR BIT(5)
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
67/* Tamper timestamp1 registers */
68#define PCF2127_REG_TS1_BASE 0x12
69#define PCF2127_BIT_TS_CTRL_TSOFF BIT(6)
70#define PCF2127_BIT_TS_CTRL_TSM BIT(7)
71/*
72 * RAM registers
73 * PCF2127 has 512 bytes general-purpose static RAM (SRAM) that is
74 * battery backed and can survive a power outage.
75 * PCF2129/31 doesn't have this feature.
76 */
77#define PCF2127_REG_RAM_ADDR_MSB 0x1A
78#define PCF2127_REG_RAM_WRT_CMD 0x1C
79#define PCF2127_REG_RAM_RD_CMD 0x1D
80
81/* Watchdog timer value constants */
82#define PCF2127_WD_VAL_STOP 0
83/* PCF2127/29 watchdog timer value constants */
84#define PCF2127_WD_CLOCK_HZ_X1000 1000 /* 1Hz */
85#define PCF2127_WD_MIN_HW_HEARTBEAT_MS 500
86/* PCF2131 watchdog timer value constants */
87#define PCF2131_WD_CLOCK_HZ_X1000 250 /* 1/4Hz */
88#define PCF2131_WD_MIN_HW_HEARTBEAT_MS 4000
89
90#define PCF2127_WD_DEFAULT_TIMEOUT_S 60
91
92/* Mask for currently enabled interrupts */
93#define PCF2127_CTRL1_IRQ_MASK (PCF2127_BIT_CTRL1_TSF1)
94#define PCF2127_CTRL2_IRQ_MASK ( \
95 PCF2127_BIT_CTRL2_AF | \
96 PCF2127_BIT_CTRL2_WDTF | \
97 PCF2127_BIT_CTRL2_TSF2)
98
99#define PCF2127_MAX_TS_SUPPORTED 4
100
101/* Control register 4 */
102#define PCF2131_REG_CTRL4 0x03
103#define PCF2131_BIT_CTRL4_TSF4 BIT(4)
104#define PCF2131_BIT_CTRL4_TSF3 BIT(5)
105#define PCF2131_BIT_CTRL4_TSF2 BIT(6)
106#define PCF2131_BIT_CTRL4_TSF1 BIT(7)
107/* Control register 5 */
108#define PCF2131_REG_CTRL5 0x04
109#define PCF2131_BIT_CTRL5_TSIE4 BIT(4)
110#define PCF2131_BIT_CTRL5_TSIE3 BIT(5)
111#define PCF2131_BIT_CTRL5_TSIE2 BIT(6)
112#define PCF2131_BIT_CTRL5_TSIE1 BIT(7)
113/* Software reset register */
114#define PCF2131_REG_SR_RESET 0x05
115#define PCF2131_SR_RESET_READ_PATTERN (BIT(2) | BIT(5))
116#define PCF2131_SR_RESET_CPR_CMD (PCF2131_SR_RESET_READ_PATTERN | BIT(7))
117/* Time and date registers */
118#define PCF2131_REG_TIME_BASE 0x07
119/* Alarm registers */
120#define PCF2131_REG_ALARM_BASE 0x0E
121/* CLKOUT control register */
122#define PCF2131_REG_CLKOUT 0x13
123/* Watchdog registers */
124#define PCF2131_REG_WD_CTL 0x35
125#define PCF2131_REG_WD_VAL 0x36
126/* Tamper timestamp1 registers */
127#define PCF2131_REG_TS1_BASE 0x14
128/* Tamper timestamp2 registers */
129#define PCF2131_REG_TS2_BASE 0x1B
130/* Tamper timestamp3 registers */
131#define PCF2131_REG_TS3_BASE 0x22
132/* Tamper timestamp4 registers */
133#define PCF2131_REG_TS4_BASE 0x29
134/* Interrupt mask registers */
135#define PCF2131_REG_INT_A_MASK1 0x31
136#define PCF2131_REG_INT_A_MASK2 0x32
137#define PCF2131_REG_INT_B_MASK1 0x33
138#define PCF2131_REG_INT_B_MASK2 0x34
139#define PCF2131_BIT_INT_BLIE BIT(0)
140#define PCF2131_BIT_INT_BIE BIT(1)
141#define PCF2131_BIT_INT_AIE BIT(2)
142#define PCF2131_BIT_INT_WD_CD BIT(3)
143#define PCF2131_BIT_INT_SI BIT(4)
144#define PCF2131_BIT_INT_MI BIT(5)
145#define PCF2131_CTRL2_IRQ_MASK ( \
146 PCF2127_BIT_CTRL2_AF | \
147 PCF2127_BIT_CTRL2_WDTF)
148#define PCF2131_CTRL4_IRQ_MASK ( \
149 PCF2131_BIT_CTRL4_TSF4 | \
150 PCF2131_BIT_CTRL4_TSF3 | \
151 PCF2131_BIT_CTRL4_TSF2 | \
152 PCF2131_BIT_CTRL4_TSF1)
153
154enum pcf21xx_type {
155 PCF2127,
156 PCF2129,
157 PCF2131,
158 PCF21XX_LAST_ID
159};
160
161struct pcf21xx_ts_config {
162 u8 reg_base; /* Base register to read timestamp values. */
163
164 /*
165 * If the TS input pin is driven to GND, an interrupt can be generated
166 * (supported by all variants).
167 */
168 u8 gnd_detect_reg; /* Interrupt control register address. */
169 u8 gnd_detect_bit; /* Interrupt bit. */
170
171 /*
172 * If the TS input pin is driven to an intermediate level between GND
173 * and supply, an interrupt can be generated (optional feature depending
174 * on variant).
175 */
176 u8 inter_detect_reg; /* Interrupt control register address. */
177 u8 inter_detect_bit; /* Interrupt bit. */
178
179 u8 ie_reg; /* Interrupt enable control register. */
180 u8 ie_bit; /* Interrupt enable bit. */
181};
182
183struct pcf21xx_config {
184 int type; /* IC variant */
185 int max_register;
186 unsigned int has_nvmem:1;
187 unsigned int has_bit_wd_ctl_cd0:1;
188 unsigned int wd_val_reg_readable:1; /* If watchdog value register can be read. */
189 unsigned int has_int_a_b:1; /* PCF2131 supports two interrupt outputs. */
190 u8 reg_time_base; /* Time/date base register. */
191 u8 regs_alarm_base; /* Alarm function base registers. */
192 u8 reg_wd_ctl; /* Watchdog control register. */
193 u8 reg_wd_val; /* Watchdog value register. */
194 u8 reg_clkout; /* Clkout register. */
195 int wdd_clock_hz_x1000; /* Watchdog clock in Hz multiplicated by 1000 */
196 int wdd_min_hw_heartbeat_ms;
197 unsigned int ts_count;
198 struct pcf21xx_ts_config ts[PCF2127_MAX_TS_SUPPORTED];
199 struct attribute_group attribute_group;
200};
201
202struct pcf2127 {
203 struct rtc_device *rtc;
204 struct watchdog_device wdd;
205 struct regmap *regmap;
206 const struct pcf21xx_config *cfg;
207 bool irq_enabled;
208 time64_t ts[PCF2127_MAX_TS_SUPPORTED]; /* Timestamp values. */
209 bool ts_valid[PCF2127_MAX_TS_SUPPORTED]; /* Timestamp valid indication. */
210};
211
212/*
213 * In the routines that deal directly with the pcf2127 hardware, we use
214 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
215 */
216static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm)
217{
218 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
219 unsigned char buf[7];
220 int ret;
221
222 /*
223 * Avoid reading CTRL2 register as it causes WD_VAL register
224 * value to reset to 0 which means watchdog is stopped.
225 */
226 ret = regmap_bulk_read(pcf2127->regmap, pcf2127->cfg->reg_time_base,
227 buf, sizeof(buf));
228 if (ret) {
229 dev_err(dev, "%s: read error\n", __func__);
230 return ret;
231 }
232
233 /* Clock integrity is not guaranteed when OSF flag is set. */
234 if (buf[0] & PCF2127_BIT_SC_OSF) {
235 /*
236 * no need clear the flag here,
237 * it will be cleared once the new date is saved
238 */
239 dev_warn(dev,
240 "oscillator stop detected, date/time is not reliable\n");
241 return -EINVAL;
242 }
243
244 dev_dbg(dev,
245 "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
246 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
247 __func__, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
248
249 tm->tm_sec = bcd2bin(buf[0] & 0x7F);
250 tm->tm_min = bcd2bin(buf[1] & 0x7F);
251 tm->tm_hour = bcd2bin(buf[2] & 0x3F);
252 tm->tm_mday = bcd2bin(buf[3] & 0x3F);
253 tm->tm_wday = buf[4] & 0x07;
254 tm->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
255 tm->tm_year = bcd2bin(buf[6]);
256 tm->tm_year += 100;
257
258 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
259 "mday=%d, mon=%d, year=%d, wday=%d\n",
260 __func__,
261 tm->tm_sec, tm->tm_min, tm->tm_hour,
262 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
263
264 return 0;
265}
266
267static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm)
268{
269 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
270 unsigned char buf[7];
271 int i = 0, err;
272
273 dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
274 "mday=%d, mon=%d, year=%d, wday=%d\n",
275 __func__,
276 tm->tm_sec, tm->tm_min, tm->tm_hour,
277 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
278
279 /* hours, minutes and seconds */
280 buf[i++] = bin2bcd(tm->tm_sec); /* this will also clear OSF flag */
281 buf[i++] = bin2bcd(tm->tm_min);
282 buf[i++] = bin2bcd(tm->tm_hour);
283 buf[i++] = bin2bcd(tm->tm_mday);
284 buf[i++] = tm->tm_wday & 0x07;
285
286 /* month, 1 - 12 */
287 buf[i++] = bin2bcd(tm->tm_mon + 1);
288
289 /* year */
290 buf[i++] = bin2bcd(tm->tm_year - 100);
291
292 /* Write access to time registers:
293 * PCF2127/29: no special action required.
294 * PCF2131: requires setting the STOP and CPR bits. STOP bit needs to
295 * be cleared after time registers are updated.
296 */
297 if (pcf2127->cfg->type == PCF2131) {
298 err = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
299 PCF2127_BIT_CTRL1_STOP,
300 PCF2127_BIT_CTRL1_STOP);
301 if (err) {
302 dev_dbg(dev, "setting STOP bit failed\n");
303 return err;
304 }
305
306 err = regmap_write(pcf2127->regmap, PCF2131_REG_SR_RESET,
307 PCF2131_SR_RESET_CPR_CMD);
308 if (err) {
309 dev_dbg(dev, "sending CPR cmd failed\n");
310 return err;
311 }
312 }
313
314 /* write time register's data */
315 err = regmap_bulk_write(pcf2127->regmap, pcf2127->cfg->reg_time_base, buf, i);
316 if (err) {
317 dev_dbg(dev, "%s: err=%d", __func__, err);
318 return err;
319 }
320
321 if (pcf2127->cfg->type == PCF2131) {
322 /* Clear STOP bit (PCF2131 only) after write is completed. */
323 err = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
324 PCF2127_BIT_CTRL1_STOP, 0);
325 if (err) {
326 dev_dbg(dev, "clearing STOP bit failed\n");
327 return err;
328 }
329 }
330
331 return 0;
332}
333
334static int pcf2127_rtc_ioctl(struct device *dev,
335 unsigned int cmd, unsigned long arg)
336{
337 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
338 int val, touser = 0;
339 int ret;
340
341 switch (cmd) {
342 case RTC_VL_READ:
343 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &val);
344 if (ret)
345 return ret;
346
347 if (val & PCF2127_BIT_CTRL3_BLF)
348 touser |= RTC_VL_BACKUP_LOW;
349
350 if (val & PCF2127_BIT_CTRL3_BF)
351 touser |= RTC_VL_BACKUP_SWITCH;
352
353 return put_user(touser, (unsigned int __user *)arg);
354
355 case RTC_VL_CLR:
356 return regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
357 PCF2127_BIT_CTRL3_BF, 0);
358
359 default:
360 return -ENOIOCTLCMD;
361 }
362}
363
364static int pcf2127_nvmem_read(void *priv, unsigned int offset,
365 void *val, size_t bytes)
366{
367 struct pcf2127 *pcf2127 = priv;
368 int ret;
369 unsigned char offsetbuf[] = { offset >> 8, offset };
370
371 ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB,
372 offsetbuf, 2);
373 if (ret)
374 return ret;
375
376 return regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_RD_CMD,
377 val, bytes);
378}
379
380static int pcf2127_nvmem_write(void *priv, unsigned int offset,
381 void *val, size_t bytes)
382{
383 struct pcf2127 *pcf2127 = priv;
384 int ret;
385 unsigned char offsetbuf[] = { offset >> 8, offset };
386
387 ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB,
388 offsetbuf, 2);
389 if (ret)
390 return ret;
391
392 return regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_WRT_CMD,
393 val, bytes);
394}
395
396/* watchdog driver */
397
398static int pcf2127_wdt_ping(struct watchdog_device *wdd)
399{
400 int wd_val;
401 struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
402
403 /*
404 * Compute counter value of WATCHDG_TIM_VAL to obtain desired period
405 * in seconds, depending on the source clock frequency.
406 */
407 wd_val = ((wdd->timeout * pcf2127->cfg->wdd_clock_hz_x1000) / 1000) + 1;
408
409 return regmap_write(pcf2127->regmap, pcf2127->cfg->reg_wd_val, wd_val);
410}
411
412/*
413 * Restart watchdog timer if feature is active.
414 *
415 * Note: Reading CTRL2 register causes watchdog to stop which is unfortunate,
416 * since register also contain control/status flags for other features.
417 * Always call this function after reading CTRL2 register.
418 */
419static int pcf2127_wdt_active_ping(struct watchdog_device *wdd)
420{
421 int ret = 0;
422
423 if (watchdog_active(wdd)) {
424 ret = pcf2127_wdt_ping(wdd);
425 if (ret)
426 dev_err(wdd->parent,
427 "%s: watchdog restart failed, ret=%d\n",
428 __func__, ret);
429 }
430
431 return ret;
432}
433
434static int pcf2127_wdt_start(struct watchdog_device *wdd)
435{
436 return pcf2127_wdt_ping(wdd);
437}
438
439static int pcf2127_wdt_stop(struct watchdog_device *wdd)
440{
441 struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
442
443 return regmap_write(pcf2127->regmap, pcf2127->cfg->reg_wd_val,
444 PCF2127_WD_VAL_STOP);
445}
446
447static int pcf2127_wdt_set_timeout(struct watchdog_device *wdd,
448 unsigned int new_timeout)
449{
450 dev_dbg(wdd->parent, "new watchdog timeout: %is (old: %is)\n",
451 new_timeout, wdd->timeout);
452
453 wdd->timeout = new_timeout;
454
455 return pcf2127_wdt_active_ping(wdd);
456}
457
458static const struct watchdog_info pcf2127_wdt_info = {
459 .identity = "NXP PCF2127/PCF2129 Watchdog",
460 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
461};
462
463static const struct watchdog_ops pcf2127_watchdog_ops = {
464 .owner = THIS_MODULE,
465 .start = pcf2127_wdt_start,
466 .stop = pcf2127_wdt_stop,
467 .ping = pcf2127_wdt_ping,
468 .set_timeout = pcf2127_wdt_set_timeout,
469};
470
471/*
472 * Compute watchdog period, t, in seconds, from the WATCHDG_TIM_VAL register
473 * value, n, and the clock frequency, f1000, in Hz x 1000.
474 *
475 * The PCF2127/29 datasheet gives t as:
476 * t = n / f
477 * The PCF2131 datasheet gives t as:
478 * t = (n - 1) / f
479 * For both variants, the watchdog is triggered when the WATCHDG_TIM_VAL reaches
480 * the value 1, and not zero. Consequently, the equation from the PCF2131
481 * datasheet seems to be the correct one for both variants.
482 */
483static int pcf2127_watchdog_get_period(int n, int f1000)
484{
485 return (1000 * (n - 1)) / f1000;
486}
487
488static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
489{
490 int ret;
491
492 if (!IS_ENABLED(CONFIG_WATCHDOG) ||
493 !device_property_read_bool(dev, "reset-source"))
494 return 0;
495
496 pcf2127->wdd.parent = dev;
497 pcf2127->wdd.info = &pcf2127_wdt_info;
498 pcf2127->wdd.ops = &pcf2127_watchdog_ops;
499
500 pcf2127->wdd.min_timeout =
501 pcf2127_watchdog_get_period(
502 2, pcf2127->cfg->wdd_clock_hz_x1000);
503 pcf2127->wdd.max_timeout =
504 pcf2127_watchdog_get_period(
505 255, pcf2127->cfg->wdd_clock_hz_x1000);
506 pcf2127->wdd.timeout = PCF2127_WD_DEFAULT_TIMEOUT_S;
507
508 dev_dbg(dev, "%s clock = %d Hz / 1000\n", __func__,
509 pcf2127->cfg->wdd_clock_hz_x1000);
510
511 pcf2127->wdd.min_hw_heartbeat_ms = pcf2127->cfg->wdd_min_hw_heartbeat_ms;
512 pcf2127->wdd.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
513
514 watchdog_set_drvdata(&pcf2127->wdd, pcf2127);
515
516 /* Test if watchdog timer is started by bootloader */
517 if (pcf2127->cfg->wd_val_reg_readable) {
518 u32 wdd_timeout;
519
520 ret = regmap_read(pcf2127->regmap, pcf2127->cfg->reg_wd_val,
521 &wdd_timeout);
522 if (ret)
523 return ret;
524
525 if (wdd_timeout)
526 set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status);
527 }
528
529 return devm_watchdog_register_device(dev, &pcf2127->wdd);
530}
531
532/* Alarm */
533static int pcf2127_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
534{
535 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
536 u8 buf[5];
537 unsigned int ctrl2;
538 int ret;
539
540 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2);
541 if (ret)
542 return ret;
543
544 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
545 if (ret)
546 return ret;
547
548 ret = regmap_bulk_read(pcf2127->regmap, pcf2127->cfg->regs_alarm_base,
549 buf, sizeof(buf));
550 if (ret)
551 return ret;
552
553 alrm->enabled = ctrl2 & PCF2127_BIT_CTRL2_AIE;
554 alrm->pending = ctrl2 & PCF2127_BIT_CTRL2_AF;
555
556 alrm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
557 alrm->time.tm_min = bcd2bin(buf[1] & 0x7F);
558 alrm->time.tm_hour = bcd2bin(buf[2] & 0x3F);
559 alrm->time.tm_mday = bcd2bin(buf[3] & 0x3F);
560
561 return 0;
562}
563
564static int pcf2127_rtc_alarm_irq_enable(struct device *dev, u32 enable)
565{
566 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
567 int ret;
568
569 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
570 PCF2127_BIT_CTRL2_AIE,
571 enable ? PCF2127_BIT_CTRL2_AIE : 0);
572 if (ret)
573 return ret;
574
575 return pcf2127_wdt_active_ping(&pcf2127->wdd);
576}
577
578static int pcf2127_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
579{
580 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
581 uint8_t buf[5];
582 int ret;
583
584 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
585 PCF2127_BIT_CTRL2_AF, 0);
586 if (ret)
587 return ret;
588
589 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
590 if (ret)
591 return ret;
592
593 buf[0] = bin2bcd(alrm->time.tm_sec);
594 buf[1] = bin2bcd(alrm->time.tm_min);
595 buf[2] = bin2bcd(alrm->time.tm_hour);
596 buf[3] = bin2bcd(alrm->time.tm_mday);
597 buf[4] = PCF2127_BIT_ALARM_AE; /* Do not match on week day */
598
599 ret = regmap_bulk_write(pcf2127->regmap, pcf2127->cfg->regs_alarm_base,
600 buf, sizeof(buf));
601 if (ret)
602 return ret;
603
604 return pcf2127_rtc_alarm_irq_enable(dev, alrm->enabled);
605}
606
607/*
608 * This function reads one timestamp function data, caller is responsible for
609 * calling pcf2127_wdt_active_ping()
610 */
611static int pcf2127_rtc_ts_read(struct device *dev, time64_t *ts,
612 int ts_id)
613{
614 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
615 struct rtc_time tm;
616 int ret;
617 unsigned char data[7];
618
619 ret = regmap_bulk_read(pcf2127->regmap, pcf2127->cfg->ts[ts_id].reg_base,
620 data, sizeof(data));
621 if (ret) {
622 dev_err(dev, "%s: read error ret=%d\n", __func__, ret);
623 return ret;
624 }
625
626 dev_dbg(dev,
627 "%s: raw data is ts_sc=%02x, ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n",
628 __func__, data[1], data[2], data[3], data[4], data[5], data[6]);
629
630 tm.tm_sec = bcd2bin(data[1] & 0x7F);
631 tm.tm_min = bcd2bin(data[2] & 0x7F);
632 tm.tm_hour = bcd2bin(data[3] & 0x3F);
633 tm.tm_mday = bcd2bin(data[4] & 0x3F);
634 /* TS_MO register (month) value range: 1-12 */
635 tm.tm_mon = bcd2bin(data[5] & 0x1F) - 1;
636 tm.tm_year = bcd2bin(data[6]);
637 if (tm.tm_year < 70)
638 tm.tm_year += 100; /* assume we are in 1970...2069 */
639
640 ret = rtc_valid_tm(&tm);
641 if (ret) {
642 dev_err(dev, "Invalid timestamp. ret=%d\n", ret);
643 return ret;
644 }
645
646 *ts = rtc_tm_to_time64(&tm);
647 return 0;
648};
649
650static void pcf2127_rtc_ts_snapshot(struct device *dev, int ts_id)
651{
652 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
653 int ret;
654
655 if (ts_id >= pcf2127->cfg->ts_count)
656 return;
657
658 /* Let userspace read the first timestamp */
659 if (pcf2127->ts_valid[ts_id])
660 return;
661
662 ret = pcf2127_rtc_ts_read(dev, &pcf2127->ts[ts_id], ts_id);
663 if (!ret)
664 pcf2127->ts_valid[ts_id] = true;
665}
666
667static irqreturn_t pcf2127_rtc_irq(int irq, void *dev)
668{
669 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
670 unsigned int ctrl2;
671 int ret = 0;
672
673 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2);
674 if (ret)
675 return IRQ_NONE;
676
677 if (pcf2127->cfg->ts_count == 1) {
678 /* PCF2127/29 */
679 unsigned int ctrl1;
680
681 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL1, &ctrl1);
682 if (ret)
683 return IRQ_NONE;
684
685 if (!(ctrl1 & PCF2127_CTRL1_IRQ_MASK || ctrl2 & PCF2127_CTRL2_IRQ_MASK))
686 return IRQ_NONE;
687
688 if (ctrl1 & PCF2127_BIT_CTRL1_TSF1 || ctrl2 & PCF2127_BIT_CTRL2_TSF2)
689 pcf2127_rtc_ts_snapshot(dev, 0);
690
691 if (ctrl1 & PCF2127_CTRL1_IRQ_MASK)
692 regmap_write(pcf2127->regmap, PCF2127_REG_CTRL1,
693 ctrl1 & ~PCF2127_CTRL1_IRQ_MASK);
694
695 if (ctrl2 & PCF2127_CTRL2_IRQ_MASK)
696 regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2,
697 ctrl2 & ~PCF2127_CTRL2_IRQ_MASK);
698 } else {
699 /* PCF2131. */
700 unsigned int ctrl4;
701
702 ret = regmap_read(pcf2127->regmap, PCF2131_REG_CTRL4, &ctrl4);
703 if (ret)
704 return IRQ_NONE;
705
706 if (!(ctrl4 & PCF2131_CTRL4_IRQ_MASK || ctrl2 & PCF2131_CTRL2_IRQ_MASK))
707 return IRQ_NONE;
708
709 if (ctrl4 & PCF2131_CTRL4_IRQ_MASK) {
710 int i;
711 int tsf_bit = PCF2131_BIT_CTRL4_TSF1; /* Start at bit 7. */
712
713 for (i = 0; i < pcf2127->cfg->ts_count; i++) {
714 if (ctrl4 & tsf_bit)
715 pcf2127_rtc_ts_snapshot(dev, i);
716
717 tsf_bit = tsf_bit >> 1;
718 }
719
720 regmap_write(pcf2127->regmap, PCF2131_REG_CTRL4,
721 ctrl4 & ~PCF2131_CTRL4_IRQ_MASK);
722 }
723
724 if (ctrl2 & PCF2131_CTRL2_IRQ_MASK)
725 regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2,
726 ctrl2 & ~PCF2131_CTRL2_IRQ_MASK);
727 }
728
729 if (ctrl2 & PCF2127_BIT_CTRL2_AF)
730 rtc_update_irq(pcf2127->rtc, 1, RTC_IRQF | RTC_AF);
731
732 pcf2127_wdt_active_ping(&pcf2127->wdd);
733
734 return IRQ_HANDLED;
735}
736
737static const struct rtc_class_ops pcf2127_rtc_ops = {
738 .ioctl = pcf2127_rtc_ioctl,
739 .read_time = pcf2127_rtc_read_time,
740 .set_time = pcf2127_rtc_set_time,
741 .read_alarm = pcf2127_rtc_read_alarm,
742 .set_alarm = pcf2127_rtc_set_alarm,
743 .alarm_irq_enable = pcf2127_rtc_alarm_irq_enable,
744};
745
746/* sysfs interface */
747
748static ssize_t timestamp_store(struct device *dev,
749 struct device_attribute *attr,
750 const char *buf, size_t count, int ts_id)
751{
752 struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent);
753 int ret;
754
755 if (ts_id >= pcf2127->cfg->ts_count)
756 return 0;
757
758 if (pcf2127->irq_enabled) {
759 pcf2127->ts_valid[ts_id] = false;
760 } else {
761 /* Always clear GND interrupt bit. */
762 ret = regmap_update_bits(pcf2127->regmap,
763 pcf2127->cfg->ts[ts_id].gnd_detect_reg,
764 pcf2127->cfg->ts[ts_id].gnd_detect_bit,
765 0);
766
767 if (ret) {
768 dev_err(dev, "%s: update TS gnd detect ret=%d\n", __func__, ret);
769 return ret;
770 }
771
772 if (pcf2127->cfg->ts[ts_id].inter_detect_bit) {
773 /* Clear intermediate level interrupt bit if supported. */
774 ret = regmap_update_bits(pcf2127->regmap,
775 pcf2127->cfg->ts[ts_id].inter_detect_reg,
776 pcf2127->cfg->ts[ts_id].inter_detect_bit,
777 0);
778 if (ret) {
779 dev_err(dev, "%s: update TS intermediate level detect ret=%d\n",
780 __func__, ret);
781 return ret;
782 }
783 }
784
785 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
786 if (ret)
787 return ret;
788 }
789
790 return count;
791}
792
793static ssize_t timestamp0_store(struct device *dev,
794 struct device_attribute *attr,
795 const char *buf, size_t count)
796{
797 return timestamp_store(dev, attr, buf, count, 0);
798};
799
800static ssize_t timestamp1_store(struct device *dev,
801 struct device_attribute *attr,
802 const char *buf, size_t count)
803{
804 return timestamp_store(dev, attr, buf, count, 1);
805};
806
807static ssize_t timestamp2_store(struct device *dev,
808 struct device_attribute *attr,
809 const char *buf, size_t count)
810{
811 return timestamp_store(dev, attr, buf, count, 2);
812};
813
814static ssize_t timestamp3_store(struct device *dev,
815 struct device_attribute *attr,
816 const char *buf, size_t count)
817{
818 return timestamp_store(dev, attr, buf, count, 3);
819};
820
821static ssize_t timestamp_show(struct device *dev,
822 struct device_attribute *attr, char *buf,
823 int ts_id)
824{
825 struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent);
826 int ret;
827 time64_t ts;
828
829 if (ts_id >= pcf2127->cfg->ts_count)
830 return 0;
831
832 if (pcf2127->irq_enabled) {
833 if (!pcf2127->ts_valid[ts_id])
834 return 0;
835 ts = pcf2127->ts[ts_id];
836 } else {
837 u8 valid_low = 0;
838 u8 valid_inter = 0;
839 unsigned int ctrl;
840
841 /* Check if TS input pin is driven to GND, supported by all
842 * variants.
843 */
844 ret = regmap_read(pcf2127->regmap,
845 pcf2127->cfg->ts[ts_id].gnd_detect_reg,
846 &ctrl);
847 if (ret)
848 return 0;
849
850 valid_low = ctrl & pcf2127->cfg->ts[ts_id].gnd_detect_bit;
851
852 if (pcf2127->cfg->ts[ts_id].inter_detect_bit) {
853 /* Check if TS input pin is driven to intermediate level
854 * between GND and supply, if supported by variant.
855 */
856 ret = regmap_read(pcf2127->regmap,
857 pcf2127->cfg->ts[ts_id].inter_detect_reg,
858 &ctrl);
859 if (ret)
860 return 0;
861
862 valid_inter = ctrl & pcf2127->cfg->ts[ts_id].inter_detect_bit;
863 }
864
865 if (!valid_low && !valid_inter)
866 return 0;
867
868 ret = pcf2127_rtc_ts_read(dev->parent, &ts, ts_id);
869 if (ret)
870 return 0;
871
872 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
873 if (ret)
874 return ret;
875 }
876 return sprintf(buf, "%llu\n", (unsigned long long)ts);
877}
878
879static ssize_t timestamp0_show(struct device *dev,
880 struct device_attribute *attr, char *buf)
881{
882 return timestamp_show(dev, attr, buf, 0);
883};
884
885static ssize_t timestamp1_show(struct device *dev,
886 struct device_attribute *attr, char *buf)
887{
888 return timestamp_show(dev, attr, buf, 1);
889};
890
891static ssize_t timestamp2_show(struct device *dev,
892 struct device_attribute *attr, char *buf)
893{
894 return timestamp_show(dev, attr, buf, 2);
895};
896
897static ssize_t timestamp3_show(struct device *dev,
898 struct device_attribute *attr, char *buf)
899{
900 return timestamp_show(dev, attr, buf, 3);
901};
902
903static DEVICE_ATTR_RW(timestamp0);
904static DEVICE_ATTR_RW(timestamp1);
905static DEVICE_ATTR_RW(timestamp2);
906static DEVICE_ATTR_RW(timestamp3);
907
908static struct attribute *pcf2127_attrs[] = {
909 &dev_attr_timestamp0.attr,
910 NULL
911};
912
913static struct attribute *pcf2131_attrs[] = {
914 &dev_attr_timestamp0.attr,
915 &dev_attr_timestamp1.attr,
916 &dev_attr_timestamp2.attr,
917 &dev_attr_timestamp3.attr,
918 NULL
919};
920
921static struct pcf21xx_config pcf21xx_cfg[] = {
922 [PCF2127] = {
923 .type = PCF2127,
924 .max_register = 0x1d,
925 .has_nvmem = 1,
926 .has_bit_wd_ctl_cd0 = 1,
927 .wd_val_reg_readable = 1,
928 .has_int_a_b = 0,
929 .reg_time_base = PCF2127_REG_TIME_BASE,
930 .regs_alarm_base = PCF2127_REG_ALARM_BASE,
931 .reg_wd_ctl = PCF2127_REG_WD_CTL,
932 .reg_wd_val = PCF2127_REG_WD_VAL,
933 .reg_clkout = PCF2127_REG_CLKOUT,
934 .wdd_clock_hz_x1000 = PCF2127_WD_CLOCK_HZ_X1000,
935 .wdd_min_hw_heartbeat_ms = PCF2127_WD_MIN_HW_HEARTBEAT_MS,
936 .ts_count = 1,
937 .ts[0] = {
938 .reg_base = PCF2127_REG_TS1_BASE,
939 .gnd_detect_reg = PCF2127_REG_CTRL1,
940 .gnd_detect_bit = PCF2127_BIT_CTRL1_TSF1,
941 .inter_detect_reg = PCF2127_REG_CTRL2,
942 .inter_detect_bit = PCF2127_BIT_CTRL2_TSF2,
943 .ie_reg = PCF2127_REG_CTRL2,
944 .ie_bit = PCF2127_BIT_CTRL2_TSIE,
945 },
946 .attribute_group = {
947 .attrs = pcf2127_attrs,
948 },
949 },
950 [PCF2129] = {
951 .type = PCF2129,
952 .max_register = 0x19,
953 .has_nvmem = 0,
954 .has_bit_wd_ctl_cd0 = 0,
955 .wd_val_reg_readable = 1,
956 .has_int_a_b = 0,
957 .reg_time_base = PCF2127_REG_TIME_BASE,
958 .regs_alarm_base = PCF2127_REG_ALARM_BASE,
959 .reg_wd_ctl = PCF2127_REG_WD_CTL,
960 .reg_wd_val = PCF2127_REG_WD_VAL,
961 .reg_clkout = PCF2127_REG_CLKOUT,
962 .wdd_clock_hz_x1000 = PCF2127_WD_CLOCK_HZ_X1000,
963 .wdd_min_hw_heartbeat_ms = PCF2127_WD_MIN_HW_HEARTBEAT_MS,
964 .ts_count = 1,
965 .ts[0] = {
966 .reg_base = PCF2127_REG_TS1_BASE,
967 .gnd_detect_reg = PCF2127_REG_CTRL1,
968 .gnd_detect_bit = PCF2127_BIT_CTRL1_TSF1,
969 .inter_detect_reg = PCF2127_REG_CTRL2,
970 .inter_detect_bit = PCF2127_BIT_CTRL2_TSF2,
971 .ie_reg = PCF2127_REG_CTRL2,
972 .ie_bit = PCF2127_BIT_CTRL2_TSIE,
973 },
974 .attribute_group = {
975 .attrs = pcf2127_attrs,
976 },
977 },
978 [PCF2131] = {
979 .type = PCF2131,
980 .max_register = 0x36,
981 .has_nvmem = 0,
982 .has_bit_wd_ctl_cd0 = 0,
983 .wd_val_reg_readable = 0,
984 .has_int_a_b = 1,
985 .reg_time_base = PCF2131_REG_TIME_BASE,
986 .regs_alarm_base = PCF2131_REG_ALARM_BASE,
987 .reg_wd_ctl = PCF2131_REG_WD_CTL,
988 .reg_wd_val = PCF2131_REG_WD_VAL,
989 .reg_clkout = PCF2131_REG_CLKOUT,
990 .wdd_clock_hz_x1000 = PCF2131_WD_CLOCK_HZ_X1000,
991 .wdd_min_hw_heartbeat_ms = PCF2131_WD_MIN_HW_HEARTBEAT_MS,
992 .ts_count = 4,
993 .ts[0] = {
994 .reg_base = PCF2131_REG_TS1_BASE,
995 .gnd_detect_reg = PCF2131_REG_CTRL4,
996 .gnd_detect_bit = PCF2131_BIT_CTRL4_TSF1,
997 .inter_detect_bit = 0,
998 .ie_reg = PCF2131_REG_CTRL5,
999 .ie_bit = PCF2131_BIT_CTRL5_TSIE1,
1000 },
1001 .ts[1] = {
1002 .reg_base = PCF2131_REG_TS2_BASE,
1003 .gnd_detect_reg = PCF2131_REG_CTRL4,
1004 .gnd_detect_bit = PCF2131_BIT_CTRL4_TSF2,
1005 .inter_detect_bit = 0,
1006 .ie_reg = PCF2131_REG_CTRL5,
1007 .ie_bit = PCF2131_BIT_CTRL5_TSIE2,
1008 },
1009 .ts[2] = {
1010 .reg_base = PCF2131_REG_TS3_BASE,
1011 .gnd_detect_reg = PCF2131_REG_CTRL4,
1012 .gnd_detect_bit = PCF2131_BIT_CTRL4_TSF3,
1013 .inter_detect_bit = 0,
1014 .ie_reg = PCF2131_REG_CTRL5,
1015 .ie_bit = PCF2131_BIT_CTRL5_TSIE3,
1016 },
1017 .ts[3] = {
1018 .reg_base = PCF2131_REG_TS4_BASE,
1019 .gnd_detect_reg = PCF2131_REG_CTRL4,
1020 .gnd_detect_bit = PCF2131_BIT_CTRL4_TSF4,
1021 .inter_detect_bit = 0,
1022 .ie_reg = PCF2131_REG_CTRL5,
1023 .ie_bit = PCF2131_BIT_CTRL5_TSIE4,
1024 },
1025 .attribute_group = {
1026 .attrs = pcf2131_attrs,
1027 },
1028 },
1029};
1030
1031/*
1032 * Enable timestamp function and corresponding interrupt(s).
1033 */
1034static int pcf2127_enable_ts(struct device *dev, int ts_id)
1035{
1036 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
1037 int ret;
1038
1039 if (ts_id >= pcf2127->cfg->ts_count) {
1040 dev_err(dev, "%s: invalid tamper detection ID (%d)\n",
1041 __func__, ts_id);
1042 return -EINVAL;
1043 }
1044
1045 /* Enable timestamp function. */
1046 ret = regmap_update_bits(pcf2127->regmap,
1047 pcf2127->cfg->ts[ts_id].reg_base,
1048 PCF2127_BIT_TS_CTRL_TSOFF |
1049 PCF2127_BIT_TS_CTRL_TSM,
1050 PCF2127_BIT_TS_CTRL_TSM);
1051 if (ret) {
1052 dev_err(dev, "%s: tamper detection config (ts%d_ctrl) failed\n",
1053 __func__, ts_id);
1054 return ret;
1055 }
1056
1057 /*
1058 * Enable interrupt generation when TSF timestamp flag is set.
1059 * Interrupt signals are open-drain outputs and can be left floating if
1060 * unused.
1061 */
1062 ret = regmap_update_bits(pcf2127->regmap, pcf2127->cfg->ts[ts_id].ie_reg,
1063 pcf2127->cfg->ts[ts_id].ie_bit,
1064 pcf2127->cfg->ts[ts_id].ie_bit);
1065 if (ret) {
1066 dev_err(dev, "%s: tamper detection TSIE%d config failed\n",
1067 __func__, ts_id);
1068 return ret;
1069 }
1070
1071 return ret;
1072}
1073
1074/* Route all interrupt sources to INT A pin. */
1075static int pcf2127_configure_interrupt_pins(struct device *dev)
1076{
1077 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
1078 int ret;
1079
1080 /* Mask bits need to be cleared to enable corresponding
1081 * interrupt source.
1082 */
1083 ret = regmap_write(pcf2127->regmap,
1084 PCF2131_REG_INT_A_MASK1, 0);
1085 if (ret)
1086 return ret;
1087
1088 ret = regmap_write(pcf2127->regmap,
1089 PCF2131_REG_INT_A_MASK2, 0);
1090 if (ret)
1091 return ret;
1092
1093 return ret;
1094}
1095
1096static int pcf2127_probe(struct device *dev, struct regmap *regmap,
1097 int alarm_irq, const struct pcf21xx_config *config)
1098{
1099 struct pcf2127 *pcf2127;
1100 int ret = 0;
1101 unsigned int val;
1102
1103 dev_dbg(dev, "%s\n", __func__);
1104
1105 pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL);
1106 if (!pcf2127)
1107 return -ENOMEM;
1108
1109 pcf2127->regmap = regmap;
1110 pcf2127->cfg = config;
1111
1112 dev_set_drvdata(dev, pcf2127);
1113
1114 pcf2127->rtc = devm_rtc_allocate_device(dev);
1115 if (IS_ERR(pcf2127->rtc))
1116 return PTR_ERR(pcf2127->rtc);
1117
1118 pcf2127->rtc->ops = &pcf2127_rtc_ops;
1119 pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
1120 pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
1121 pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
1122
1123 /*
1124 * PCF2127/29 do not work correctly when setting alarms at 1s intervals.
1125 * PCF2131 is ok.
1126 */
1127 if (pcf2127->cfg->type == PCF2127 || pcf2127->cfg->type == PCF2129) {
1128 set_bit(RTC_FEATURE_ALARM_RES_2S, pcf2127->rtc->features);
1129 clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, pcf2127->rtc->features);
1130 }
1131
1132 clear_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
1133
1134 if (alarm_irq > 0) {
1135 unsigned long flags;
1136
1137 /*
1138 * If flags = 0, devm_request_threaded_irq() will use IRQ flags
1139 * obtained from device tree.
1140 */
1141 if (dev_fwnode(dev))
1142 flags = 0;
1143 else
1144 flags = IRQF_TRIGGER_LOW;
1145
1146 ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
1147 pcf2127_rtc_irq,
1148 flags | IRQF_ONESHOT,
1149 dev_name(dev), dev);
1150 if (ret) {
1151 dev_err(dev, "failed to request alarm irq\n");
1152 return ret;
1153 }
1154 pcf2127->irq_enabled = true;
1155 }
1156
1157 if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
1158 device_init_wakeup(dev, true);
1159 set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
1160 }
1161
1162 if (pcf2127->cfg->has_int_a_b) {
1163 /* Configure int A/B pins, independently of alarm_irq. */
1164 ret = pcf2127_configure_interrupt_pins(dev);
1165 if (ret) {
1166 dev_err(dev, "failed to configure interrupt pins\n");
1167 return ret;
1168 }
1169 }
1170
1171 if (pcf2127->cfg->has_nvmem) {
1172 struct nvmem_config nvmem_cfg = {
1173 .priv = pcf2127,
1174 .reg_read = pcf2127_nvmem_read,
1175 .reg_write = pcf2127_nvmem_write,
1176 .size = 512,
1177 };
1178
1179 ret = devm_rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
1180 }
1181
1182 /*
1183 * The "Power-On Reset Override" facility prevents the RTC to do a reset
1184 * after power on. For normal operation the PORO must be disabled.
1185 */
1186 ret = regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
1187 PCF2127_BIT_CTRL1_POR_OVRD);
1188 if (ret < 0)
1189 return ret;
1190
1191 ret = regmap_read(pcf2127->regmap, pcf2127->cfg->reg_clkout, &val);
1192 if (ret < 0)
1193 return ret;
1194
1195 if (!(val & PCF2127_BIT_CLKOUT_OTPR)) {
1196 ret = regmap_set_bits(pcf2127->regmap, pcf2127->cfg->reg_clkout,
1197 PCF2127_BIT_CLKOUT_OTPR);
1198 if (ret < 0)
1199 return ret;
1200
1201 msleep(100);
1202 }
1203
1204 /*
1205 * Watchdog timer enabled and reset pin /RST activated when timed out.
1206 * Select 1Hz clock source for watchdog timer (1/4Hz for PCF2131).
1207 * Note: Countdown timer disabled and not available.
1208 * For pca2129, pcf2129 and pcf2131, only bit[7] is for Symbol WD_CD
1209 * of register watchdg_tim_ctl. The bit[6] is labeled
1210 * as T. Bits labeled as T must always be written with
1211 * logic 0.
1212 */
1213 ret = regmap_update_bits(pcf2127->regmap, pcf2127->cfg->reg_wd_ctl,
1214 PCF2127_BIT_WD_CTL_CD1 |
1215 PCF2127_BIT_WD_CTL_CD0 |
1216 PCF2127_BIT_WD_CTL_TF1 |
1217 PCF2127_BIT_WD_CTL_TF0,
1218 PCF2127_BIT_WD_CTL_CD1 |
1219 (pcf2127->cfg->has_bit_wd_ctl_cd0 ? PCF2127_BIT_WD_CTL_CD0 : 0) |
1220 PCF2127_BIT_WD_CTL_TF1);
1221 if (ret) {
1222 dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
1223 return ret;
1224 }
1225
1226 pcf2127_watchdog_init(dev, pcf2127);
1227
1228 /*
1229 * Disable battery low/switch-over timestamp and interrupts.
1230 * Clear battery interrupt flags which can block new trigger events.
1231 * Note: This is the default chip behaviour but added to ensure
1232 * correct tamper timestamp and interrupt function.
1233 */
1234 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
1235 PCF2127_BIT_CTRL3_BTSE |
1236 PCF2127_BIT_CTRL3_BIE |
1237 PCF2127_BIT_CTRL3_BLIE, 0);
1238 if (ret) {
1239 dev_err(dev, "%s: interrupt config (ctrl3) failed\n",
1240 __func__);
1241 return ret;
1242 }
1243
1244 /*
1245 * Enable timestamp functions 1 to 4.
1246 */
1247 for (int i = 0; i < pcf2127->cfg->ts_count; i++) {
1248 ret = pcf2127_enable_ts(dev, i);
1249 if (ret)
1250 return ret;
1251 }
1252
1253 ret = rtc_add_group(pcf2127->rtc, &pcf2127->cfg->attribute_group);
1254 if (ret) {
1255 dev_err(dev, "%s: tamper sysfs registering failed\n",
1256 __func__);
1257 return ret;
1258 }
1259
1260 return devm_rtc_register_device(pcf2127->rtc);
1261}
1262
1263#ifdef CONFIG_OF
1264static const struct of_device_id pcf2127_of_match[] = {
1265 { .compatible = "nxp,pcf2127", .data = &pcf21xx_cfg[PCF2127] },
1266 { .compatible = "nxp,pcf2129", .data = &pcf21xx_cfg[PCF2129] },
1267 { .compatible = "nxp,pca2129", .data = &pcf21xx_cfg[PCF2129] },
1268 { .compatible = "nxp,pcf2131", .data = &pcf21xx_cfg[PCF2131] },
1269 {}
1270};
1271MODULE_DEVICE_TABLE(of, pcf2127_of_match);
1272#endif
1273
1274#if IS_ENABLED(CONFIG_I2C)
1275
1276static int pcf2127_i2c_write(void *context, const void *data, size_t count)
1277{
1278 struct device *dev = context;
1279 struct i2c_client *client = to_i2c_client(dev);
1280 int ret;
1281
1282 ret = i2c_master_send(client, data, count);
1283 if (ret != count)
1284 return ret < 0 ? ret : -EIO;
1285
1286 return 0;
1287}
1288
1289static int pcf2127_i2c_gather_write(void *context,
1290 const void *reg, size_t reg_size,
1291 const void *val, size_t val_size)
1292{
1293 struct device *dev = context;
1294 struct i2c_client *client = to_i2c_client(dev);
1295 int ret;
1296 void *buf;
1297
1298 if (WARN_ON(reg_size != 1))
1299 return -EINVAL;
1300
1301 buf = kmalloc(val_size + 1, GFP_KERNEL);
1302 if (!buf)
1303 return -ENOMEM;
1304
1305 memcpy(buf, reg, 1);
1306 memcpy(buf + 1, val, val_size);
1307
1308 ret = i2c_master_send(client, buf, val_size + 1);
1309
1310 kfree(buf);
1311
1312 if (ret != val_size + 1)
1313 return ret < 0 ? ret : -EIO;
1314
1315 return 0;
1316}
1317
1318static int pcf2127_i2c_read(void *context, const void *reg, size_t reg_size,
1319 void *val, size_t val_size)
1320{
1321 struct device *dev = context;
1322 struct i2c_client *client = to_i2c_client(dev);
1323 int ret;
1324
1325 if (WARN_ON(reg_size != 1))
1326 return -EINVAL;
1327
1328 ret = i2c_master_send(client, reg, 1);
1329 if (ret != 1)
1330 return ret < 0 ? ret : -EIO;
1331
1332 ret = i2c_master_recv(client, val, val_size);
1333 if (ret != val_size)
1334 return ret < 0 ? ret : -EIO;
1335
1336 return 0;
1337}
1338
1339/*
1340 * The reason we need this custom regmap_bus instead of using regmap_init_i2c()
1341 * is that the STOP condition is required between set register address and
1342 * read register data when reading from registers.
1343 */
1344static const struct regmap_bus pcf2127_i2c_regmap = {
1345 .write = pcf2127_i2c_write,
1346 .gather_write = pcf2127_i2c_gather_write,
1347 .read = pcf2127_i2c_read,
1348};
1349
1350static struct i2c_driver pcf2127_i2c_driver;
1351
1352static const struct i2c_device_id pcf2127_i2c_id[] = {
1353 { "pcf2127", PCF2127 },
1354 { "pcf2129", PCF2129 },
1355 { "pca2129", PCF2129 },
1356 { "pcf2131", PCF2131 },
1357 { }
1358};
1359MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id);
1360
1361static int pcf2127_i2c_probe(struct i2c_client *client)
1362{
1363 struct regmap *regmap;
1364 static struct regmap_config config = {
1365 .reg_bits = 8,
1366 .val_bits = 8,
1367 };
1368 const struct pcf21xx_config *variant;
1369
1370 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
1371 return -ENODEV;
1372
1373 if (client->dev.of_node) {
1374 variant = of_device_get_match_data(&client->dev);
1375 if (!variant)
1376 return -ENODEV;
1377 } else {
1378 enum pcf21xx_type type =
1379 i2c_match_id(pcf2127_i2c_id, client)->driver_data;
1380
1381 if (type >= PCF21XX_LAST_ID)
1382 return -ENODEV;
1383 variant = &pcf21xx_cfg[type];
1384 }
1385
1386 config.max_register = variant->max_register,
1387
1388 regmap = devm_regmap_init(&client->dev, &pcf2127_i2c_regmap,
1389 &client->dev, &config);
1390 if (IS_ERR(regmap)) {
1391 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
1392 __func__, PTR_ERR(regmap));
1393 return PTR_ERR(regmap);
1394 }
1395
1396 return pcf2127_probe(&client->dev, regmap, client->irq, variant);
1397}
1398
1399static struct i2c_driver pcf2127_i2c_driver = {
1400 .driver = {
1401 .name = "rtc-pcf2127-i2c",
1402 .of_match_table = of_match_ptr(pcf2127_of_match),
1403 },
1404 .probe = pcf2127_i2c_probe,
1405 .id_table = pcf2127_i2c_id,
1406};
1407
1408static int pcf2127_i2c_register_driver(void)
1409{
1410 return i2c_add_driver(&pcf2127_i2c_driver);
1411}
1412
1413static void pcf2127_i2c_unregister_driver(void)
1414{
1415 i2c_del_driver(&pcf2127_i2c_driver);
1416}
1417
1418#else
1419
1420static int pcf2127_i2c_register_driver(void)
1421{
1422 return 0;
1423}
1424
1425static void pcf2127_i2c_unregister_driver(void)
1426{
1427}
1428
1429#endif
1430
1431#if IS_ENABLED(CONFIG_SPI_MASTER)
1432
1433static struct spi_driver pcf2127_spi_driver;
1434static const struct spi_device_id pcf2127_spi_id[];
1435
1436static int pcf2127_spi_probe(struct spi_device *spi)
1437{
1438 static struct regmap_config config = {
1439 .reg_bits = 8,
1440 .val_bits = 8,
1441 .read_flag_mask = 0xa0,
1442 .write_flag_mask = 0x20,
1443 };
1444 struct regmap *regmap;
1445 const struct pcf21xx_config *variant;
1446
1447 if (spi->dev.of_node) {
1448 variant = of_device_get_match_data(&spi->dev);
1449 if (!variant)
1450 return -ENODEV;
1451 } else {
1452 enum pcf21xx_type type = spi_get_device_id(spi)->driver_data;
1453
1454 if (type >= PCF21XX_LAST_ID)
1455 return -ENODEV;
1456 variant = &pcf21xx_cfg[type];
1457 }
1458
1459 config.max_register = variant->max_register,
1460
1461 regmap = devm_regmap_init_spi(spi, &config);
1462 if (IS_ERR(regmap)) {
1463 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
1464 __func__, PTR_ERR(regmap));
1465 return PTR_ERR(regmap);
1466 }
1467
1468 return pcf2127_probe(&spi->dev, regmap, spi->irq, variant);
1469}
1470
1471static const struct spi_device_id pcf2127_spi_id[] = {
1472 { "pcf2127", PCF2127 },
1473 { "pcf2129", PCF2129 },
1474 { "pca2129", PCF2129 },
1475 { "pcf2131", PCF2131 },
1476 { }
1477};
1478MODULE_DEVICE_TABLE(spi, pcf2127_spi_id);
1479
1480static struct spi_driver pcf2127_spi_driver = {
1481 .driver = {
1482 .name = "rtc-pcf2127-spi",
1483 .of_match_table = of_match_ptr(pcf2127_of_match),
1484 },
1485 .probe = pcf2127_spi_probe,
1486 .id_table = pcf2127_spi_id,
1487};
1488
1489static int pcf2127_spi_register_driver(void)
1490{
1491 return spi_register_driver(&pcf2127_spi_driver);
1492}
1493
1494static void pcf2127_spi_unregister_driver(void)
1495{
1496 spi_unregister_driver(&pcf2127_spi_driver);
1497}
1498
1499#else
1500
1501static int pcf2127_spi_register_driver(void)
1502{
1503 return 0;
1504}
1505
1506static void pcf2127_spi_unregister_driver(void)
1507{
1508}
1509
1510#endif
1511
1512static int __init pcf2127_init(void)
1513{
1514 int ret;
1515
1516 ret = pcf2127_i2c_register_driver();
1517 if (ret) {
1518 pr_err("Failed to register pcf2127 i2c driver: %d\n", ret);
1519 return ret;
1520 }
1521
1522 ret = pcf2127_spi_register_driver();
1523 if (ret) {
1524 pr_err("Failed to register pcf2127 spi driver: %d\n", ret);
1525 pcf2127_i2c_unregister_driver();
1526 }
1527
1528 return ret;
1529}
1530module_init(pcf2127_init)
1531
1532static void __exit pcf2127_exit(void)
1533{
1534 pcf2127_spi_unregister_driver();
1535 pcf2127_i2c_unregister_driver();
1536}
1537module_exit(pcf2127_exit)
1538
1539MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");
1540MODULE_DESCRIPTION("NXP PCF2127/29/31 RTC driver");
1541MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * An I2C and SPI driver for the NXP PCF2127/29 RTC
4 * Copyright 2013 Til-Technologies
5 *
6 * Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
7 *
8 * Watchdog and tamper functions
9 * Author: Bruno Thomsen <bruno.thomsen@gmail.com>
10 *
11 * based on the other drivers in this same directory.
12 *
13 * Datasheet: https://www.nxp.com/docs/en/data-sheet/PCF2127.pdf
14 */
15
16#include <linux/i2c.h>
17#include <linux/spi/spi.h>
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>
23#include <linux/of_irq.h>
24#include <linux/regmap.h>
25#include <linux/watchdog.h>
26
27/* Control register 1 */
28#define PCF2127_REG_CTRL1 0x00
29#define PCF2127_BIT_CTRL1_POR_OVRD BIT(3)
30#define PCF2127_BIT_CTRL1_TSF1 BIT(4)
31/* Control register 2 */
32#define PCF2127_REG_CTRL2 0x01
33#define PCF2127_BIT_CTRL2_AIE BIT(1)
34#define PCF2127_BIT_CTRL2_TSIE BIT(2)
35#define PCF2127_BIT_CTRL2_AF BIT(4)
36#define PCF2127_BIT_CTRL2_TSF2 BIT(5)
37#define PCF2127_BIT_CTRL2_WDTF BIT(6)
38/* Control register 3 */
39#define PCF2127_REG_CTRL3 0x02
40#define PCF2127_BIT_CTRL3_BLIE BIT(0)
41#define PCF2127_BIT_CTRL3_BIE BIT(1)
42#define PCF2127_BIT_CTRL3_BLF BIT(2)
43#define PCF2127_BIT_CTRL3_BF BIT(3)
44#define PCF2127_BIT_CTRL3_BTSE BIT(4)
45/* Time and date registers */
46#define PCF2127_REG_SC 0x03
47#define PCF2127_BIT_SC_OSF BIT(7)
48#define PCF2127_REG_MN 0x04
49#define PCF2127_REG_HR 0x05
50#define PCF2127_REG_DM 0x06
51#define PCF2127_REG_DW 0x07
52#define PCF2127_REG_MO 0x08
53#define PCF2127_REG_YR 0x09
54/* Alarm registers */
55#define PCF2127_REG_ALARM_SC 0x0A
56#define PCF2127_REG_ALARM_MN 0x0B
57#define PCF2127_REG_ALARM_HR 0x0C
58#define PCF2127_REG_ALARM_DM 0x0D
59#define PCF2127_REG_ALARM_DW 0x0E
60#define PCF2127_BIT_ALARM_AE BIT(7)
61/* CLKOUT control register */
62#define PCF2127_REG_CLKOUT 0x0f
63#define PCF2127_BIT_CLKOUT_OTPR BIT(5)
64/* Watchdog registers */
65#define PCF2127_REG_WD_CTL 0x10
66#define PCF2127_BIT_WD_CTL_TF0 BIT(0)
67#define PCF2127_BIT_WD_CTL_TF1 BIT(1)
68#define PCF2127_BIT_WD_CTL_CD0 BIT(6)
69#define PCF2127_BIT_WD_CTL_CD1 BIT(7)
70#define PCF2127_REG_WD_VAL 0x11
71/* Tamper timestamp registers */
72#define PCF2127_REG_TS_CTRL 0x12
73#define PCF2127_BIT_TS_CTRL_TSOFF BIT(6)
74#define PCF2127_BIT_TS_CTRL_TSM BIT(7)
75#define PCF2127_REG_TS_SC 0x13
76#define PCF2127_REG_TS_MN 0x14
77#define PCF2127_REG_TS_HR 0x15
78#define PCF2127_REG_TS_DM 0x16
79#define PCF2127_REG_TS_MO 0x17
80#define PCF2127_REG_TS_YR 0x18
81/*
82 * RAM registers
83 * PCF2127 has 512 bytes general-purpose static RAM (SRAM) that is
84 * battery backed and can survive a power outage.
85 * PCF2129 doesn't have this feature.
86 */
87#define PCF2127_REG_RAM_ADDR_MSB 0x1A
88#define PCF2127_REG_RAM_WRT_CMD 0x1C
89#define PCF2127_REG_RAM_RD_CMD 0x1D
90
91/* Watchdog timer value constants */
92#define PCF2127_WD_VAL_STOP 0
93#define PCF2127_WD_VAL_MIN 2
94#define PCF2127_WD_VAL_MAX 255
95#define PCF2127_WD_VAL_DEFAULT 60
96
97/* Mask for currently enabled interrupts */
98#define PCF2127_CTRL1_IRQ_MASK (PCF2127_BIT_CTRL1_TSF1)
99#define PCF2127_CTRL2_IRQ_MASK ( \
100 PCF2127_BIT_CTRL2_AF | \
101 PCF2127_BIT_CTRL2_WDTF | \
102 PCF2127_BIT_CTRL2_TSF2)
103
104struct pcf2127 {
105 struct rtc_device *rtc;
106 struct watchdog_device wdd;
107 struct regmap *regmap;
108 time64_t ts;
109 bool ts_valid;
110 bool irq_enabled;
111};
112
113/*
114 * In the routines that deal directly with the pcf2127 hardware, we use
115 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
116 */
117static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm)
118{
119 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
120 unsigned char buf[10];
121 int ret;
122
123 /*
124 * Avoid reading CTRL2 register as it causes WD_VAL register
125 * value to reset to 0 which means watchdog is stopped.
126 */
127 ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL3,
128 (buf + PCF2127_REG_CTRL3),
129 ARRAY_SIZE(buf) - PCF2127_REG_CTRL3);
130 if (ret) {
131 dev_err(dev, "%s: read error\n", __func__);
132 return ret;
133 }
134
135 if (buf[PCF2127_REG_CTRL3] & PCF2127_BIT_CTRL3_BLF)
136 dev_info(dev,
137 "low voltage detected, check/replace RTC battery.\n");
138
139 /* Clock integrity is not guaranteed when OSF flag is set. */
140 if (buf[PCF2127_REG_SC] & PCF2127_BIT_SC_OSF) {
141 /*
142 * no need clear the flag here,
143 * it will be cleared once the new date is saved
144 */
145 dev_warn(dev,
146 "oscillator stop detected, date/time is not reliable\n");
147 return -EINVAL;
148 }
149
150 dev_dbg(dev,
151 "%s: raw data is cr3=%02x, sec=%02x, min=%02x, hr=%02x, "
152 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
153 __func__, buf[PCF2127_REG_CTRL3], buf[PCF2127_REG_SC],
154 buf[PCF2127_REG_MN], buf[PCF2127_REG_HR],
155 buf[PCF2127_REG_DM], buf[PCF2127_REG_DW],
156 buf[PCF2127_REG_MO], buf[PCF2127_REG_YR]);
157
158 tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
159 tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
160 tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); /* rtc hr 0-23 */
161 tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
162 tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
163 tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
164 tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]);
165 tm->tm_year += 100;
166
167 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
168 "mday=%d, mon=%d, year=%d, wday=%d\n",
169 __func__,
170 tm->tm_sec, tm->tm_min, tm->tm_hour,
171 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
172
173 return 0;
174}
175
176static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm)
177{
178 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
179 unsigned char buf[7];
180 int i = 0, err;
181
182 dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, "
183 "mday=%d, mon=%d, year=%d, wday=%d\n",
184 __func__,
185 tm->tm_sec, tm->tm_min, tm->tm_hour,
186 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
187
188 /* hours, minutes and seconds */
189 buf[i++] = bin2bcd(tm->tm_sec); /* this will also clear OSF flag */
190 buf[i++] = bin2bcd(tm->tm_min);
191 buf[i++] = bin2bcd(tm->tm_hour);
192 buf[i++] = bin2bcd(tm->tm_mday);
193 buf[i++] = tm->tm_wday & 0x07;
194
195 /* month, 1 - 12 */
196 buf[i++] = bin2bcd(tm->tm_mon + 1);
197
198 /* year */
199 buf[i++] = bin2bcd(tm->tm_year - 100);
200
201 /* write register's data */
202 err = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_SC, buf, i);
203 if (err) {
204 dev_err(dev,
205 "%s: err=%d", __func__, err);
206 return err;
207 }
208
209 return 0;
210}
211
212static int pcf2127_rtc_ioctl(struct device *dev,
213 unsigned int cmd, unsigned long arg)
214{
215 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
216 int val, touser = 0;
217 int ret;
218
219 switch (cmd) {
220 case RTC_VL_READ:
221 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL3, &val);
222 if (ret)
223 return ret;
224
225 if (val & PCF2127_BIT_CTRL3_BLF)
226 touser |= RTC_VL_BACKUP_LOW;
227
228 if (val & PCF2127_BIT_CTRL3_BF)
229 touser |= RTC_VL_BACKUP_SWITCH;
230
231 return put_user(touser, (unsigned int __user *)arg);
232
233 case RTC_VL_CLR:
234 return regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
235 PCF2127_BIT_CTRL3_BF, 0);
236
237 default:
238 return -ENOIOCTLCMD;
239 }
240}
241
242static int pcf2127_nvmem_read(void *priv, unsigned int offset,
243 void *val, size_t bytes)
244{
245 struct pcf2127 *pcf2127 = priv;
246 int ret;
247 unsigned char offsetbuf[] = { offset >> 8, offset };
248
249 ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB,
250 offsetbuf, 2);
251 if (ret)
252 return ret;
253
254 return regmap_bulk_read(pcf2127->regmap, PCF2127_REG_RAM_RD_CMD,
255 val, bytes);
256}
257
258static int pcf2127_nvmem_write(void *priv, unsigned int offset,
259 void *val, size_t bytes)
260{
261 struct pcf2127 *pcf2127 = priv;
262 int ret;
263 unsigned char offsetbuf[] = { offset >> 8, offset };
264
265 ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_ADDR_MSB,
266 offsetbuf, 2);
267 if (ret)
268 return ret;
269
270 return regmap_bulk_write(pcf2127->regmap, PCF2127_REG_RAM_WRT_CMD,
271 val, bytes);
272}
273
274/* watchdog driver */
275
276static int pcf2127_wdt_ping(struct watchdog_device *wdd)
277{
278 struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
279
280 return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL, wdd->timeout);
281}
282
283/*
284 * Restart watchdog timer if feature is active.
285 *
286 * Note: Reading CTRL2 register causes watchdog to stop which is unfortunate,
287 * since register also contain control/status flags for other features.
288 * Always call this function after reading CTRL2 register.
289 */
290static int pcf2127_wdt_active_ping(struct watchdog_device *wdd)
291{
292 int ret = 0;
293
294 if (watchdog_active(wdd)) {
295 ret = pcf2127_wdt_ping(wdd);
296 if (ret)
297 dev_err(wdd->parent,
298 "%s: watchdog restart failed, ret=%d\n",
299 __func__, ret);
300 }
301
302 return ret;
303}
304
305static int pcf2127_wdt_start(struct watchdog_device *wdd)
306{
307 return pcf2127_wdt_ping(wdd);
308}
309
310static int pcf2127_wdt_stop(struct watchdog_device *wdd)
311{
312 struct pcf2127 *pcf2127 = watchdog_get_drvdata(wdd);
313
314 return regmap_write(pcf2127->regmap, PCF2127_REG_WD_VAL,
315 PCF2127_WD_VAL_STOP);
316}
317
318static int pcf2127_wdt_set_timeout(struct watchdog_device *wdd,
319 unsigned int new_timeout)
320{
321 dev_dbg(wdd->parent, "new watchdog timeout: %is (old: %is)\n",
322 new_timeout, wdd->timeout);
323
324 wdd->timeout = new_timeout;
325
326 return pcf2127_wdt_active_ping(wdd);
327}
328
329static const struct watchdog_info pcf2127_wdt_info = {
330 .identity = "NXP PCF2127/PCF2129 Watchdog",
331 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
332};
333
334static const struct watchdog_ops pcf2127_watchdog_ops = {
335 .owner = THIS_MODULE,
336 .start = pcf2127_wdt_start,
337 .stop = pcf2127_wdt_stop,
338 .ping = pcf2127_wdt_ping,
339 .set_timeout = pcf2127_wdt_set_timeout,
340};
341
342static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
343{
344 u32 wdd_timeout;
345 int ret;
346
347 if (!IS_ENABLED(CONFIG_WATCHDOG) ||
348 !device_property_read_bool(dev, "reset-source"))
349 return 0;
350
351 pcf2127->wdd.parent = dev;
352 pcf2127->wdd.info = &pcf2127_wdt_info;
353 pcf2127->wdd.ops = &pcf2127_watchdog_ops;
354 pcf2127->wdd.min_timeout = PCF2127_WD_VAL_MIN;
355 pcf2127->wdd.max_timeout = PCF2127_WD_VAL_MAX;
356 pcf2127->wdd.timeout = PCF2127_WD_VAL_DEFAULT;
357 pcf2127->wdd.min_hw_heartbeat_ms = 500;
358 pcf2127->wdd.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
359
360 watchdog_set_drvdata(&pcf2127->wdd, pcf2127);
361
362 /* Test if watchdog timer is started by bootloader */
363 ret = regmap_read(pcf2127->regmap, PCF2127_REG_WD_VAL, &wdd_timeout);
364 if (ret)
365 return ret;
366
367 if (wdd_timeout)
368 set_bit(WDOG_HW_RUNNING, &pcf2127->wdd.status);
369
370 return devm_watchdog_register_device(dev, &pcf2127->wdd);
371}
372
373/* Alarm */
374static int pcf2127_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
375{
376 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
377 unsigned int buf[5], ctrl2;
378 int ret;
379
380 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2);
381 if (ret)
382 return ret;
383
384 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
385 if (ret)
386 return ret;
387
388 ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf,
389 sizeof(buf));
390 if (ret)
391 return ret;
392
393 alrm->enabled = ctrl2 & PCF2127_BIT_CTRL2_AIE;
394 alrm->pending = ctrl2 & PCF2127_BIT_CTRL2_AF;
395
396 alrm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
397 alrm->time.tm_min = bcd2bin(buf[1] & 0x7F);
398 alrm->time.tm_hour = bcd2bin(buf[2] & 0x3F);
399 alrm->time.tm_mday = bcd2bin(buf[3] & 0x3F);
400
401 return 0;
402}
403
404static int pcf2127_rtc_alarm_irq_enable(struct device *dev, u32 enable)
405{
406 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
407 int ret;
408
409 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
410 PCF2127_BIT_CTRL2_AIE,
411 enable ? PCF2127_BIT_CTRL2_AIE : 0);
412 if (ret)
413 return ret;
414
415 return pcf2127_wdt_active_ping(&pcf2127->wdd);
416}
417
418static int pcf2127_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
419{
420 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
421 uint8_t buf[5];
422 int ret;
423
424 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
425 PCF2127_BIT_CTRL2_AF, 0);
426 if (ret)
427 return ret;
428
429 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
430 if (ret)
431 return ret;
432
433 buf[0] = bin2bcd(alrm->time.tm_sec);
434 buf[1] = bin2bcd(alrm->time.tm_min);
435 buf[2] = bin2bcd(alrm->time.tm_hour);
436 buf[3] = bin2bcd(alrm->time.tm_mday);
437 buf[4] = PCF2127_BIT_ALARM_AE; /* Do not match on week day */
438
439 ret = regmap_bulk_write(pcf2127->regmap, PCF2127_REG_ALARM_SC, buf,
440 sizeof(buf));
441 if (ret)
442 return ret;
443
444 return pcf2127_rtc_alarm_irq_enable(dev, alrm->enabled);
445}
446
447/*
448 * This function reads ctrl2 register, caller is responsible for calling
449 * pcf2127_wdt_active_ping()
450 */
451static int pcf2127_rtc_ts_read(struct device *dev, time64_t *ts)
452{
453 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
454 struct rtc_time tm;
455 int ret;
456 unsigned char data[25];
457
458 ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, data,
459 sizeof(data));
460 if (ret) {
461 dev_err(dev, "%s: read error ret=%d\n", __func__, ret);
462 return ret;
463 }
464
465 dev_dbg(dev,
466 "%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, ts_sc=%02x, ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n",
467 __func__, data[PCF2127_REG_CTRL1], data[PCF2127_REG_CTRL2],
468 data[PCF2127_REG_CTRL3], data[PCF2127_REG_TS_SC],
469 data[PCF2127_REG_TS_MN], data[PCF2127_REG_TS_HR],
470 data[PCF2127_REG_TS_DM], data[PCF2127_REG_TS_MO],
471 data[PCF2127_REG_TS_YR]);
472
473 tm.tm_sec = bcd2bin(data[PCF2127_REG_TS_SC] & 0x7F);
474 tm.tm_min = bcd2bin(data[PCF2127_REG_TS_MN] & 0x7F);
475 tm.tm_hour = bcd2bin(data[PCF2127_REG_TS_HR] & 0x3F);
476 tm.tm_mday = bcd2bin(data[PCF2127_REG_TS_DM] & 0x3F);
477 /* TS_MO register (month) value range: 1-12 */
478 tm.tm_mon = bcd2bin(data[PCF2127_REG_TS_MO] & 0x1F) - 1;
479 tm.tm_year = bcd2bin(data[PCF2127_REG_TS_YR]);
480 if (tm.tm_year < 70)
481 tm.tm_year += 100; /* assume we are in 1970...2069 */
482
483 ret = rtc_valid_tm(&tm);
484 if (ret) {
485 dev_err(dev, "Invalid timestamp. ret=%d\n", ret);
486 return ret;
487 }
488
489 *ts = rtc_tm_to_time64(&tm);
490 return 0;
491};
492
493static void pcf2127_rtc_ts_snapshot(struct device *dev)
494{
495 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
496 int ret;
497
498 /* Let userspace read the first timestamp */
499 if (pcf2127->ts_valid)
500 return;
501
502 ret = pcf2127_rtc_ts_read(dev, &pcf2127->ts);
503 if (!ret)
504 pcf2127->ts_valid = true;
505}
506
507static irqreturn_t pcf2127_rtc_irq(int irq, void *dev)
508{
509 struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
510 unsigned int ctrl1, ctrl2;
511 int ret = 0;
512
513 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL1, &ctrl1);
514 if (ret)
515 return IRQ_NONE;
516
517 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2);
518 if (ret)
519 return IRQ_NONE;
520
521 if (!(ctrl1 & PCF2127_CTRL1_IRQ_MASK || ctrl2 & PCF2127_CTRL2_IRQ_MASK))
522 return IRQ_NONE;
523
524 if (ctrl1 & PCF2127_BIT_CTRL1_TSF1 || ctrl2 & PCF2127_BIT_CTRL2_TSF2)
525 pcf2127_rtc_ts_snapshot(dev);
526
527 if (ctrl1 & PCF2127_CTRL1_IRQ_MASK)
528 regmap_write(pcf2127->regmap, PCF2127_REG_CTRL1,
529 ctrl1 & ~PCF2127_CTRL1_IRQ_MASK);
530
531 if (ctrl2 & PCF2127_CTRL2_IRQ_MASK)
532 regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2,
533 ctrl2 & ~PCF2127_CTRL2_IRQ_MASK);
534
535 if (ctrl2 & PCF2127_BIT_CTRL2_AF)
536 rtc_update_irq(pcf2127->rtc, 1, RTC_IRQF | RTC_AF);
537
538 pcf2127_wdt_active_ping(&pcf2127->wdd);
539
540 return IRQ_HANDLED;
541}
542
543static const struct rtc_class_ops pcf2127_rtc_ops = {
544 .ioctl = pcf2127_rtc_ioctl,
545 .read_time = pcf2127_rtc_read_time,
546 .set_time = pcf2127_rtc_set_time,
547 .read_alarm = pcf2127_rtc_read_alarm,
548 .set_alarm = pcf2127_rtc_set_alarm,
549 .alarm_irq_enable = pcf2127_rtc_alarm_irq_enable,
550};
551
552/* sysfs interface */
553
554static ssize_t timestamp0_store(struct device *dev,
555 struct device_attribute *attr,
556 const char *buf, size_t count)
557{
558 struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent);
559 int ret;
560
561 if (pcf2127->irq_enabled) {
562 pcf2127->ts_valid = false;
563 } else {
564 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
565 PCF2127_BIT_CTRL1_TSF1, 0);
566 if (ret) {
567 dev_err(dev, "%s: update ctrl1 ret=%d\n", __func__, ret);
568 return ret;
569 }
570
571 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
572 PCF2127_BIT_CTRL2_TSF2, 0);
573 if (ret) {
574 dev_err(dev, "%s: update ctrl2 ret=%d\n", __func__, ret);
575 return ret;
576 }
577
578 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
579 if (ret)
580 return ret;
581 }
582
583 return count;
584};
585
586static ssize_t timestamp0_show(struct device *dev,
587 struct device_attribute *attr, char *buf)
588{
589 struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent);
590 unsigned int ctrl1, ctrl2;
591 int ret;
592 time64_t ts;
593
594 if (pcf2127->irq_enabled) {
595 if (!pcf2127->ts_valid)
596 return 0;
597 ts = pcf2127->ts;
598 } else {
599 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL1, &ctrl1);
600 if (ret)
601 return 0;
602
603 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2);
604 if (ret)
605 return 0;
606
607 if (!(ctrl1 & PCF2127_BIT_CTRL1_TSF1) &&
608 !(ctrl2 & PCF2127_BIT_CTRL2_TSF2))
609 return 0;
610
611 ret = pcf2127_rtc_ts_read(dev->parent, &ts);
612 if (ret)
613 return 0;
614
615 ret = pcf2127_wdt_active_ping(&pcf2127->wdd);
616 if (ret)
617 return ret;
618 }
619 return sprintf(buf, "%llu\n", (unsigned long long)ts);
620};
621
622static DEVICE_ATTR_RW(timestamp0);
623
624static struct attribute *pcf2127_attrs[] = {
625 &dev_attr_timestamp0.attr,
626 NULL
627};
628
629static const struct attribute_group pcf2127_attr_group = {
630 .attrs = pcf2127_attrs,
631};
632
633static int pcf2127_probe(struct device *dev, struct regmap *regmap,
634 int alarm_irq, const char *name, bool is_pcf2127)
635{
636 struct pcf2127 *pcf2127;
637 int ret = 0;
638 unsigned int val;
639
640 dev_dbg(dev, "%s\n", __func__);
641
642 pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL);
643 if (!pcf2127)
644 return -ENOMEM;
645
646 pcf2127->regmap = regmap;
647
648 dev_set_drvdata(dev, pcf2127);
649
650 pcf2127->rtc = devm_rtc_allocate_device(dev);
651 if (IS_ERR(pcf2127->rtc))
652 return PTR_ERR(pcf2127->rtc);
653
654 pcf2127->rtc->ops = &pcf2127_rtc_ops;
655 pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
656 pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
657 pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
658 pcf2127->rtc->uie_unsupported = 1;
659 clear_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
660
661 if (alarm_irq > 0) {
662 ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
663 pcf2127_rtc_irq,
664 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
665 dev_name(dev), dev);
666 if (ret) {
667 dev_err(dev, "failed to request alarm irq\n");
668 return ret;
669 }
670 pcf2127->irq_enabled = true;
671 }
672
673 if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
674 device_init_wakeup(dev, true);
675 set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
676 }
677
678 if (is_pcf2127) {
679 struct nvmem_config nvmem_cfg = {
680 .priv = pcf2127,
681 .reg_read = pcf2127_nvmem_read,
682 .reg_write = pcf2127_nvmem_write,
683 .size = 512,
684 };
685
686 ret = devm_rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
687 }
688
689 /*
690 * The "Power-On Reset Override" facility prevents the RTC to do a reset
691 * after power on. For normal operation the PORO must be disabled.
692 */
693 regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
694 PCF2127_BIT_CTRL1_POR_OVRD);
695
696 ret = regmap_read(pcf2127->regmap, PCF2127_REG_CLKOUT, &val);
697 if (ret < 0)
698 return ret;
699
700 if (!(val & PCF2127_BIT_CLKOUT_OTPR)) {
701 ret = regmap_set_bits(pcf2127->regmap, PCF2127_REG_CLKOUT,
702 PCF2127_BIT_CLKOUT_OTPR);
703 if (ret < 0)
704 return ret;
705
706 msleep(100);
707 }
708
709 /*
710 * Watchdog timer enabled and reset pin /RST activated when timed out.
711 * Select 1Hz clock source for watchdog timer.
712 * Note: Countdown timer disabled and not available.
713 * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
714 * of register watchdg_tim_ctl. The bit[6] is labeled
715 * as T. Bits labeled as T must always be written with
716 * logic 0.
717 */
718 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
719 PCF2127_BIT_WD_CTL_CD1 |
720 PCF2127_BIT_WD_CTL_CD0 |
721 PCF2127_BIT_WD_CTL_TF1 |
722 PCF2127_BIT_WD_CTL_TF0,
723 PCF2127_BIT_WD_CTL_CD1 |
724 (is_pcf2127 ? PCF2127_BIT_WD_CTL_CD0 : 0) |
725 PCF2127_BIT_WD_CTL_TF1);
726 if (ret) {
727 dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
728 return ret;
729 }
730
731 pcf2127_watchdog_init(dev, pcf2127);
732
733 /*
734 * Disable battery low/switch-over timestamp and interrupts.
735 * Clear battery interrupt flags which can block new trigger events.
736 * Note: This is the default chip behaviour but added to ensure
737 * correct tamper timestamp and interrupt function.
738 */
739 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
740 PCF2127_BIT_CTRL3_BTSE |
741 PCF2127_BIT_CTRL3_BIE |
742 PCF2127_BIT_CTRL3_BLIE, 0);
743 if (ret) {
744 dev_err(dev, "%s: interrupt config (ctrl3) failed\n",
745 __func__);
746 return ret;
747 }
748
749 /*
750 * Enable timestamp function and store timestamp of first trigger
751 * event until TSF1 and TFS2 interrupt flags are cleared.
752 */
753 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_TS_CTRL,
754 PCF2127_BIT_TS_CTRL_TSOFF |
755 PCF2127_BIT_TS_CTRL_TSM,
756 PCF2127_BIT_TS_CTRL_TSM);
757 if (ret) {
758 dev_err(dev, "%s: tamper detection config (ts_ctrl) failed\n",
759 __func__);
760 return ret;
761 }
762
763 /*
764 * Enable interrupt generation when TSF1 or TSF2 timestamp flags
765 * are set. Interrupt signal is an open-drain output and can be
766 * left floating if unused.
767 */
768 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
769 PCF2127_BIT_CTRL2_TSIE,
770 PCF2127_BIT_CTRL2_TSIE);
771 if (ret) {
772 dev_err(dev, "%s: tamper detection config (ctrl2) failed\n",
773 __func__);
774 return ret;
775 }
776
777 ret = rtc_add_group(pcf2127->rtc, &pcf2127_attr_group);
778 if (ret) {
779 dev_err(dev, "%s: tamper sysfs registering failed\n",
780 __func__);
781 return ret;
782 }
783
784 return devm_rtc_register_device(pcf2127->rtc);
785}
786
787#ifdef CONFIG_OF
788static const struct of_device_id pcf2127_of_match[] = {
789 { .compatible = "nxp,pcf2127" },
790 { .compatible = "nxp,pcf2129" },
791 { .compatible = "nxp,pca2129" },
792 {}
793};
794MODULE_DEVICE_TABLE(of, pcf2127_of_match);
795#endif
796
797#if IS_ENABLED(CONFIG_I2C)
798
799static int pcf2127_i2c_write(void *context, const void *data, size_t count)
800{
801 struct device *dev = context;
802 struct i2c_client *client = to_i2c_client(dev);
803 int ret;
804
805 ret = i2c_master_send(client, data, count);
806 if (ret != count)
807 return ret < 0 ? ret : -EIO;
808
809 return 0;
810}
811
812static int pcf2127_i2c_gather_write(void *context,
813 const void *reg, size_t reg_size,
814 const void *val, size_t val_size)
815{
816 struct device *dev = context;
817 struct i2c_client *client = to_i2c_client(dev);
818 int ret;
819 void *buf;
820
821 if (WARN_ON(reg_size != 1))
822 return -EINVAL;
823
824 buf = kmalloc(val_size + 1, GFP_KERNEL);
825 if (!buf)
826 return -ENOMEM;
827
828 memcpy(buf, reg, 1);
829 memcpy(buf + 1, val, val_size);
830
831 ret = i2c_master_send(client, buf, val_size + 1);
832
833 kfree(buf);
834
835 if (ret != val_size + 1)
836 return ret < 0 ? ret : -EIO;
837
838 return 0;
839}
840
841static int pcf2127_i2c_read(void *context, const void *reg, size_t reg_size,
842 void *val, size_t val_size)
843{
844 struct device *dev = context;
845 struct i2c_client *client = to_i2c_client(dev);
846 int ret;
847
848 if (WARN_ON(reg_size != 1))
849 return -EINVAL;
850
851 ret = i2c_master_send(client, reg, 1);
852 if (ret != 1)
853 return ret < 0 ? ret : -EIO;
854
855 ret = i2c_master_recv(client, val, val_size);
856 if (ret != val_size)
857 return ret < 0 ? ret : -EIO;
858
859 return 0;
860}
861
862/*
863 * The reason we need this custom regmap_bus instead of using regmap_init_i2c()
864 * is that the STOP condition is required between set register address and
865 * read register data when reading from registers.
866 */
867static const struct regmap_bus pcf2127_i2c_regmap = {
868 .write = pcf2127_i2c_write,
869 .gather_write = pcf2127_i2c_gather_write,
870 .read = pcf2127_i2c_read,
871};
872
873static struct i2c_driver pcf2127_i2c_driver;
874
875static int pcf2127_i2c_probe(struct i2c_client *client,
876 const struct i2c_device_id *id)
877{
878 struct regmap *regmap;
879 static const struct regmap_config config = {
880 .reg_bits = 8,
881 .val_bits = 8,
882 .max_register = 0x1d,
883 };
884
885 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
886 return -ENODEV;
887
888 regmap = devm_regmap_init(&client->dev, &pcf2127_i2c_regmap,
889 &client->dev, &config);
890 if (IS_ERR(regmap)) {
891 dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
892 __func__, PTR_ERR(regmap));
893 return PTR_ERR(regmap);
894 }
895
896 return pcf2127_probe(&client->dev, regmap, client->irq,
897 pcf2127_i2c_driver.driver.name, id->driver_data);
898}
899
900static const struct i2c_device_id pcf2127_i2c_id[] = {
901 { "pcf2127", 1 },
902 { "pcf2129", 0 },
903 { "pca2129", 0 },
904 { }
905};
906MODULE_DEVICE_TABLE(i2c, pcf2127_i2c_id);
907
908static struct i2c_driver pcf2127_i2c_driver = {
909 .driver = {
910 .name = "rtc-pcf2127-i2c",
911 .of_match_table = of_match_ptr(pcf2127_of_match),
912 },
913 .probe = pcf2127_i2c_probe,
914 .id_table = pcf2127_i2c_id,
915};
916
917static int pcf2127_i2c_register_driver(void)
918{
919 return i2c_add_driver(&pcf2127_i2c_driver);
920}
921
922static void pcf2127_i2c_unregister_driver(void)
923{
924 i2c_del_driver(&pcf2127_i2c_driver);
925}
926
927#else
928
929static int pcf2127_i2c_register_driver(void)
930{
931 return 0;
932}
933
934static void pcf2127_i2c_unregister_driver(void)
935{
936}
937
938#endif
939
940#if IS_ENABLED(CONFIG_SPI_MASTER)
941
942static struct spi_driver pcf2127_spi_driver;
943
944static int pcf2127_spi_probe(struct spi_device *spi)
945{
946 static const struct regmap_config config = {
947 .reg_bits = 8,
948 .val_bits = 8,
949 .read_flag_mask = 0xa0,
950 .write_flag_mask = 0x20,
951 .max_register = 0x1d,
952 };
953 struct regmap *regmap;
954
955 regmap = devm_regmap_init_spi(spi, &config);
956 if (IS_ERR(regmap)) {
957 dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",
958 __func__, PTR_ERR(regmap));
959 return PTR_ERR(regmap);
960 }
961
962 return pcf2127_probe(&spi->dev, regmap, spi->irq,
963 pcf2127_spi_driver.driver.name,
964 spi_get_device_id(spi)->driver_data);
965}
966
967static const struct spi_device_id pcf2127_spi_id[] = {
968 { "pcf2127", 1 },
969 { "pcf2129", 0 },
970 { "pca2129", 0 },
971 { }
972};
973MODULE_DEVICE_TABLE(spi, pcf2127_spi_id);
974
975static struct spi_driver pcf2127_spi_driver = {
976 .driver = {
977 .name = "rtc-pcf2127-spi",
978 .of_match_table = of_match_ptr(pcf2127_of_match),
979 },
980 .probe = pcf2127_spi_probe,
981 .id_table = pcf2127_spi_id,
982};
983
984static int pcf2127_spi_register_driver(void)
985{
986 return spi_register_driver(&pcf2127_spi_driver);
987}
988
989static void pcf2127_spi_unregister_driver(void)
990{
991 spi_unregister_driver(&pcf2127_spi_driver);
992}
993
994#else
995
996static int pcf2127_spi_register_driver(void)
997{
998 return 0;
999}
1000
1001static void pcf2127_spi_unregister_driver(void)
1002{
1003}
1004
1005#endif
1006
1007static int __init pcf2127_init(void)
1008{
1009 int ret;
1010
1011 ret = pcf2127_i2c_register_driver();
1012 if (ret) {
1013 pr_err("Failed to register pcf2127 i2c driver: %d\n", ret);
1014 return ret;
1015 }
1016
1017 ret = pcf2127_spi_register_driver();
1018 if (ret) {
1019 pr_err("Failed to register pcf2127 spi driver: %d\n", ret);
1020 pcf2127_i2c_unregister_driver();
1021 }
1022
1023 return ret;
1024}
1025module_init(pcf2127_init)
1026
1027static void __exit pcf2127_exit(void)
1028{
1029 pcf2127_spi_unregister_driver();
1030 pcf2127_i2c_unregister_driver();
1031}
1032module_exit(pcf2127_exit)
1033
1034MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");
1035MODULE_DESCRIPTION("NXP PCF2127/29 RTC driver");
1036MODULE_LICENSE("GPL v2");