Loading...
1/* rtc-ds1343.c
2 *
3 * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
4 * Real Time Clock
5 *
6 * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
7 * Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/device.h>
19#include <linux/spi/spi.h>
20#include <linux/regmap.h>
21#include <linux/rtc.h>
22#include <linux/bcd.h>
23#include <linux/pm.h>
24#include <linux/pm_wakeirq.h>
25#include <linux/slab.h>
26
27#define DALLAS_MAXIM_DS1343 0
28#define DALLAS_MAXIM_DS1344 1
29
30/* RTC DS1343 Registers */
31#define DS1343_SECONDS_REG 0x00
32#define DS1343_MINUTES_REG 0x01
33#define DS1343_HOURS_REG 0x02
34#define DS1343_DAY_REG 0x03
35#define DS1343_DATE_REG 0x04
36#define DS1343_MONTH_REG 0x05
37#define DS1343_YEAR_REG 0x06
38#define DS1343_ALM0_SEC_REG 0x07
39#define DS1343_ALM0_MIN_REG 0x08
40#define DS1343_ALM0_HOUR_REG 0x09
41#define DS1343_ALM0_DAY_REG 0x0A
42#define DS1343_ALM1_SEC_REG 0x0B
43#define DS1343_ALM1_MIN_REG 0x0C
44#define DS1343_ALM1_HOUR_REG 0x0D
45#define DS1343_ALM1_DAY_REG 0x0E
46#define DS1343_CONTROL_REG 0x0F
47#define DS1343_STATUS_REG 0x10
48#define DS1343_TRICKLE_REG 0x11
49#define DS1343_NVRAM 0x20
50
51#define DS1343_NVRAM_LEN 96
52
53/* DS1343 Control Registers bits */
54#define DS1343_EOSC 0x80
55#define DS1343_DOSF 0x20
56#define DS1343_EGFIL 0x10
57#define DS1343_SQW 0x08
58#define DS1343_INTCN 0x04
59#define DS1343_A1IE 0x02
60#define DS1343_A0IE 0x01
61
62/* DS1343 Status Registers bits */
63#define DS1343_OSF 0x80
64#define DS1343_IRQF1 0x02
65#define DS1343_IRQF0 0x01
66
67/* DS1343 Trickle Charger Registers bits */
68#define DS1343_TRICKLE_MAGIC 0xa0
69#define DS1343_TRICKLE_DS1 0x08
70#define DS1343_TRICKLE_1K 0x01
71#define DS1343_TRICKLE_2K 0x02
72#define DS1343_TRICKLE_4K 0x03
73
74static const struct spi_device_id ds1343_id[] = {
75 { "ds1343", DALLAS_MAXIM_DS1343 },
76 { "ds1344", DALLAS_MAXIM_DS1344 },
77 { }
78};
79MODULE_DEVICE_TABLE(spi, ds1343_id);
80
81struct ds1343_priv {
82 struct spi_device *spi;
83 struct rtc_device *rtc;
84 struct regmap *map;
85 struct mutex mutex;
86 unsigned int irqen;
87 int irq;
88 int alarm_sec;
89 int alarm_min;
90 int alarm_hour;
91 int alarm_mday;
92};
93
94static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
95{
96 switch (cmd) {
97#ifdef RTC_SET_CHARGE
98 case RTC_SET_CHARGE:
99 {
100 int val;
101
102 if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
103 return -EFAULT;
104
105 return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
106 }
107 break;
108#endif
109 }
110
111 return -ENOIOCTLCMD;
112}
113
114static ssize_t ds1343_show_glitchfilter(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 struct ds1343_priv *priv = dev_get_drvdata(dev);
118 int glitch_filt_status, data;
119
120 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
121
122 glitch_filt_status = !!(data & DS1343_EGFIL);
123
124 if (glitch_filt_status)
125 return sprintf(buf, "enabled\n");
126 else
127 return sprintf(buf, "disabled\n");
128}
129
130static ssize_t ds1343_store_glitchfilter(struct device *dev,
131 struct device_attribute *attr,
132 const char *buf, size_t count)
133{
134 struct ds1343_priv *priv = dev_get_drvdata(dev);
135 int data;
136
137 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
138
139 if (strncmp(buf, "enabled", 7) == 0)
140 data |= DS1343_EGFIL;
141
142 else if (strncmp(buf, "disabled", 8) == 0)
143 data &= ~(DS1343_EGFIL);
144
145 else
146 return -EINVAL;
147
148 regmap_write(priv->map, DS1343_CONTROL_REG, data);
149
150 return count;
151}
152
153static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,
154 ds1343_store_glitchfilter);
155
156static int ds1343_nvram_write(void *priv, unsigned int off, void *val,
157 size_t bytes)
158{
159 struct ds1343_priv *ds1343 = priv;
160
161 return regmap_bulk_write(ds1343->map, DS1343_NVRAM + off, val, bytes);
162}
163
164static int ds1343_nvram_read(void *priv, unsigned int off, void *val,
165 size_t bytes)
166{
167 struct ds1343_priv *ds1343 = priv;
168
169 return regmap_bulk_read(ds1343->map, DS1343_NVRAM + off, val, bytes);
170}
171
172static ssize_t ds1343_show_tricklecharger(struct device *dev,
173 struct device_attribute *attr, char *buf)
174{
175 struct ds1343_priv *priv = dev_get_drvdata(dev);
176 int data;
177 char *diodes = "disabled", *resistors = " ";
178
179 regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
180
181 if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
182 switch (data & 0x0c) {
183 case DS1343_TRICKLE_DS1:
184 diodes = "one diode,";
185 break;
186
187 default:
188 diodes = "no diode,";
189 break;
190 }
191
192 switch (data & 0x03) {
193 case DS1343_TRICKLE_1K:
194 resistors = "1k Ohm";
195 break;
196
197 case DS1343_TRICKLE_2K:
198 resistors = "2k Ohm";
199 break;
200
201 case DS1343_TRICKLE_4K:
202 resistors = "4k Ohm";
203 break;
204
205 default:
206 diodes = "disabled";
207 break;
208 }
209 }
210
211 return sprintf(buf, "%s %s\n", diodes, resistors);
212}
213
214static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
215
216static int ds1343_sysfs_register(struct device *dev)
217{
218 int err;
219
220 err = device_create_file(dev, &dev_attr_glitch_filter);
221 if (err)
222 return err;
223
224 err = device_create_file(dev, &dev_attr_trickle_charger);
225 if (!err)
226 return 0;
227
228 device_remove_file(dev, &dev_attr_glitch_filter);
229
230 return err;
231}
232
233static void ds1343_sysfs_unregister(struct device *dev)
234{
235 device_remove_file(dev, &dev_attr_glitch_filter);
236 device_remove_file(dev, &dev_attr_trickle_charger);
237}
238
239static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
240{
241 struct ds1343_priv *priv = dev_get_drvdata(dev);
242 unsigned char buf[7];
243 int res;
244
245 res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
246 if (res)
247 return res;
248
249 dt->tm_sec = bcd2bin(buf[0]);
250 dt->tm_min = bcd2bin(buf[1]);
251 dt->tm_hour = bcd2bin(buf[2] & 0x3F);
252 dt->tm_wday = bcd2bin(buf[3]) - 1;
253 dt->tm_mday = bcd2bin(buf[4]);
254 dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
255 dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
256
257 return 0;
258}
259
260static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
261{
262 struct ds1343_priv *priv = dev_get_drvdata(dev);
263 int res;
264
265 res = regmap_write(priv->map, DS1343_SECONDS_REG,
266 bin2bcd(dt->tm_sec));
267 if (res)
268 return res;
269
270 res = regmap_write(priv->map, DS1343_MINUTES_REG,
271 bin2bcd(dt->tm_min));
272 if (res)
273 return res;
274
275 res = regmap_write(priv->map, DS1343_HOURS_REG,
276 bin2bcd(dt->tm_hour) & 0x3F);
277 if (res)
278 return res;
279
280 res = regmap_write(priv->map, DS1343_DAY_REG,
281 bin2bcd(dt->tm_wday + 1));
282 if (res)
283 return res;
284
285 res = regmap_write(priv->map, DS1343_DATE_REG,
286 bin2bcd(dt->tm_mday));
287 if (res)
288 return res;
289
290 res = regmap_write(priv->map, DS1343_MONTH_REG,
291 bin2bcd(dt->tm_mon + 1));
292 if (res)
293 return res;
294
295 dt->tm_year %= 100;
296
297 res = regmap_write(priv->map, DS1343_YEAR_REG,
298 bin2bcd(dt->tm_year));
299 if (res)
300 return res;
301
302 return 0;
303}
304
305static int ds1343_update_alarm(struct device *dev)
306{
307 struct ds1343_priv *priv = dev_get_drvdata(dev);
308 unsigned int control, stat;
309 unsigned char buf[4];
310 int res = 0;
311
312 res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
313 if (res)
314 return res;
315
316 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
317 if (res)
318 return res;
319
320 control &= ~(DS1343_A0IE);
321 stat &= ~(DS1343_IRQF0);
322
323 res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
324 if (res)
325 return res;
326
327 res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
328 if (res)
329 return res;
330
331 buf[0] = priv->alarm_sec < 0 || (priv->irqen & RTC_UF) ?
332 0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
333 buf[1] = priv->alarm_min < 0 || (priv->irqen & RTC_UF) ?
334 0x80 : bin2bcd(priv->alarm_min) & 0x7F;
335 buf[2] = priv->alarm_hour < 0 || (priv->irqen & RTC_UF) ?
336 0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
337 buf[3] = priv->alarm_mday < 0 || (priv->irqen & RTC_UF) ?
338 0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
339
340 res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
341 if (res)
342 return res;
343
344 if (priv->irqen) {
345 control |= DS1343_A0IE;
346 res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
347 }
348
349 return res;
350}
351
352static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
353{
354 struct ds1343_priv *priv = dev_get_drvdata(dev);
355 int res = 0;
356 unsigned int stat;
357
358 if (priv->irq <= 0)
359 return -EINVAL;
360
361 mutex_lock(&priv->mutex);
362
363 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
364 if (res)
365 goto out;
366
367 alarm->enabled = !!(priv->irqen & RTC_AF);
368 alarm->pending = !!(stat & DS1343_IRQF0);
369
370 alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
371 alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
372 alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
373 alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
374
375out:
376 mutex_unlock(&priv->mutex);
377 return res;
378}
379
380static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
381{
382 struct ds1343_priv *priv = dev_get_drvdata(dev);
383 int res = 0;
384
385 if (priv->irq <= 0)
386 return -EINVAL;
387
388 mutex_lock(&priv->mutex);
389
390 priv->alarm_sec = alarm->time.tm_sec;
391 priv->alarm_min = alarm->time.tm_min;
392 priv->alarm_hour = alarm->time.tm_hour;
393 priv->alarm_mday = alarm->time.tm_mday;
394
395 if (alarm->enabled)
396 priv->irqen |= RTC_AF;
397
398 res = ds1343_update_alarm(dev);
399
400 mutex_unlock(&priv->mutex);
401
402 return res;
403}
404
405static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
406{
407 struct ds1343_priv *priv = dev_get_drvdata(dev);
408 int res = 0;
409
410 if (priv->irq <= 0)
411 return -EINVAL;
412
413 mutex_lock(&priv->mutex);
414
415 if (enabled)
416 priv->irqen |= RTC_AF;
417 else
418 priv->irqen &= ~RTC_AF;
419
420 res = ds1343_update_alarm(dev);
421
422 mutex_unlock(&priv->mutex);
423
424 return res;
425}
426
427static irqreturn_t ds1343_thread(int irq, void *dev_id)
428{
429 struct ds1343_priv *priv = dev_id;
430 unsigned int stat, control;
431 int res = 0;
432
433 mutex_lock(&priv->mutex);
434
435 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
436 if (res)
437 goto out;
438
439 if (stat & DS1343_IRQF0) {
440 stat &= ~DS1343_IRQF0;
441 regmap_write(priv->map, DS1343_STATUS_REG, stat);
442
443 res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
444 if (res)
445 goto out;
446
447 control &= ~DS1343_A0IE;
448 regmap_write(priv->map, DS1343_CONTROL_REG, control);
449
450 rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
451 }
452
453out:
454 mutex_unlock(&priv->mutex);
455 return IRQ_HANDLED;
456}
457
458static const struct rtc_class_ops ds1343_rtc_ops = {
459 .ioctl = ds1343_ioctl,
460 .read_time = ds1343_read_time,
461 .set_time = ds1343_set_time,
462 .read_alarm = ds1343_read_alarm,
463 .set_alarm = ds1343_set_alarm,
464 .alarm_irq_enable = ds1343_alarm_irq_enable,
465};
466
467static int ds1343_probe(struct spi_device *spi)
468{
469 struct ds1343_priv *priv;
470 struct regmap_config config = { .reg_bits = 8, .val_bits = 8,
471 .write_flag_mask = 0x80, };
472 unsigned int data;
473 int res;
474 struct nvmem_config nvmem_cfg = {
475 .name = "ds1343-",
476 .word_size = 1,
477 .stride = 1,
478 .size = DS1343_NVRAM_LEN,
479 .reg_read = ds1343_nvram_read,
480 .reg_write = ds1343_nvram_write,
481 };
482
483 priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
484 if (!priv)
485 return -ENOMEM;
486
487 priv->spi = spi;
488 mutex_init(&priv->mutex);
489
490 /* RTC DS1347 works in spi mode 3 and
491 * its chip select is active high
492 */
493 spi->mode = SPI_MODE_3 | SPI_CS_HIGH;
494 spi->bits_per_word = 8;
495 res = spi_setup(spi);
496 if (res)
497 return res;
498
499 spi_set_drvdata(spi, priv);
500
501 priv->map = devm_regmap_init_spi(spi, &config);
502
503 if (IS_ERR(priv->map)) {
504 dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
505 return PTR_ERR(priv->map);
506 }
507
508 res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
509 if (res)
510 return res;
511
512 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
513 data |= DS1343_INTCN;
514 data &= ~(DS1343_EOSC | DS1343_A1IE | DS1343_A0IE);
515 regmap_write(priv->map, DS1343_CONTROL_REG, data);
516
517 regmap_read(priv->map, DS1343_STATUS_REG, &data);
518 data &= ~(DS1343_OSF | DS1343_IRQF1 | DS1343_IRQF0);
519 regmap_write(priv->map, DS1343_STATUS_REG, data);
520
521 priv->rtc = devm_rtc_allocate_device(&spi->dev);
522 if (IS_ERR(priv->rtc))
523 return PTR_ERR(priv->rtc);
524
525 priv->rtc->nvram_old_abi = true;
526 priv->rtc->ops = &ds1343_rtc_ops;
527
528 res = rtc_register_device(priv->rtc);
529 if (res)
530 return res;
531
532 nvmem_cfg.priv = priv;
533 rtc_nvmem_register(priv->rtc, &nvmem_cfg);
534
535 priv->irq = spi->irq;
536
537 if (priv->irq >= 0) {
538 res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
539 ds1343_thread, IRQF_ONESHOT,
540 "ds1343", priv);
541 if (res) {
542 priv->irq = -1;
543 dev_err(&spi->dev,
544 "unable to request irq for rtc ds1343\n");
545 } else {
546 device_init_wakeup(&spi->dev, true);
547 dev_pm_set_wake_irq(&spi->dev, spi->irq);
548 }
549 }
550
551 res = ds1343_sysfs_register(&spi->dev);
552 if (res)
553 dev_err(&spi->dev,
554 "unable to create sysfs entries for rtc ds1343\n");
555
556 return 0;
557}
558
559static int ds1343_remove(struct spi_device *spi)
560{
561 struct ds1343_priv *priv = spi_get_drvdata(spi);
562
563 if (spi->irq) {
564 mutex_lock(&priv->mutex);
565 priv->irqen &= ~RTC_AF;
566 mutex_unlock(&priv->mutex);
567
568 dev_pm_clear_wake_irq(&spi->dev);
569 device_init_wakeup(&spi->dev, false);
570 devm_free_irq(&spi->dev, spi->irq, priv);
571 }
572
573 spi_set_drvdata(spi, NULL);
574
575 ds1343_sysfs_unregister(&spi->dev);
576
577 return 0;
578}
579
580#ifdef CONFIG_PM_SLEEP
581
582static int ds1343_suspend(struct device *dev)
583{
584 struct spi_device *spi = to_spi_device(dev);
585
586 if (spi->irq >= 0 && device_may_wakeup(dev))
587 enable_irq_wake(spi->irq);
588
589 return 0;
590}
591
592static int ds1343_resume(struct device *dev)
593{
594 struct spi_device *spi = to_spi_device(dev);
595
596 if (spi->irq >= 0 && device_may_wakeup(dev))
597 disable_irq_wake(spi->irq);
598
599 return 0;
600}
601
602#endif
603
604static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
605
606static struct spi_driver ds1343_driver = {
607 .driver = {
608 .name = "ds1343",
609 .pm = &ds1343_pm,
610 },
611 .probe = ds1343_probe,
612 .remove = ds1343_remove,
613 .id_table = ds1343_id,
614};
615
616module_spi_driver(ds1343_driver);
617
618MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
619MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
620 "Ankur Srivastava <sankurece@gmail.com>");
621MODULE_LICENSE("GPL v2");
1/* rtc-ds1343.c
2 *
3 * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
4 * Real Time Clock
5 *
6 * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
7 * Ankur Srivastava <sankurece@gmail.com> : DS1343 Nvram Support
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 */
14
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/device.h>
19#include <linux/spi/spi.h>
20#include <linux/regmap.h>
21#include <linux/rtc.h>
22#include <linux/bcd.h>
23#include <linux/pm.h>
24#include <linux/pm_wakeirq.h>
25#include <linux/slab.h>
26
27#define DALLAS_MAXIM_DS1343 0
28#define DALLAS_MAXIM_DS1344 1
29
30/* RTC DS1343 Registers */
31#define DS1343_SECONDS_REG 0x00
32#define DS1343_MINUTES_REG 0x01
33#define DS1343_HOURS_REG 0x02
34#define DS1343_DAY_REG 0x03
35#define DS1343_DATE_REG 0x04
36#define DS1343_MONTH_REG 0x05
37#define DS1343_YEAR_REG 0x06
38#define DS1343_ALM0_SEC_REG 0x07
39#define DS1343_ALM0_MIN_REG 0x08
40#define DS1343_ALM0_HOUR_REG 0x09
41#define DS1343_ALM0_DAY_REG 0x0A
42#define DS1343_ALM1_SEC_REG 0x0B
43#define DS1343_ALM1_MIN_REG 0x0C
44#define DS1343_ALM1_HOUR_REG 0x0D
45#define DS1343_ALM1_DAY_REG 0x0E
46#define DS1343_CONTROL_REG 0x0F
47#define DS1343_STATUS_REG 0x10
48#define DS1343_TRICKLE_REG 0x11
49#define DS1343_NVRAM 0x20
50
51#define DS1343_NVRAM_LEN 96
52
53/* DS1343 Control Registers bits */
54#define DS1343_EOSC 0x80
55#define DS1343_DOSF 0x20
56#define DS1343_EGFIL 0x10
57#define DS1343_SQW 0x08
58#define DS1343_INTCN 0x04
59#define DS1343_A1IE 0x02
60#define DS1343_A0IE 0x01
61
62/* DS1343 Status Registers bits */
63#define DS1343_OSF 0x80
64#define DS1343_IRQF1 0x02
65#define DS1343_IRQF0 0x01
66
67/* DS1343 Trickle Charger Registers bits */
68#define DS1343_TRICKLE_MAGIC 0xa0
69#define DS1343_TRICKLE_DS1 0x08
70#define DS1343_TRICKLE_1K 0x01
71#define DS1343_TRICKLE_2K 0x02
72#define DS1343_TRICKLE_4K 0x03
73
74static const struct spi_device_id ds1343_id[] = {
75 { "ds1343", DALLAS_MAXIM_DS1343 },
76 { "ds1344", DALLAS_MAXIM_DS1344 },
77 { }
78};
79MODULE_DEVICE_TABLE(spi, ds1343_id);
80
81struct ds1343_priv {
82 struct spi_device *spi;
83 struct rtc_device *rtc;
84 struct regmap *map;
85 struct mutex mutex;
86 unsigned int irqen;
87 int irq;
88 int alarm_sec;
89 int alarm_min;
90 int alarm_hour;
91 int alarm_mday;
92};
93
94static int ds1343_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
95{
96 switch (cmd) {
97#ifdef RTC_SET_CHARGE
98 case RTC_SET_CHARGE:
99 {
100 int val;
101
102 if (copy_from_user(&val, (int __user *)arg, sizeof(int)))
103 return -EFAULT;
104
105 return regmap_write(priv->map, DS1343_TRICKLE_REG, val);
106 }
107 break;
108#endif
109 }
110
111 return -ENOIOCTLCMD;
112}
113
114static ssize_t ds1343_show_glitchfilter(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 struct ds1343_priv *priv = dev_get_drvdata(dev);
118 int glitch_filt_status, data;
119
120 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
121
122 glitch_filt_status = !!(data & DS1343_EGFIL);
123
124 if (glitch_filt_status)
125 return sprintf(buf, "enabled\n");
126 else
127 return sprintf(buf, "disabled\n");
128}
129
130static ssize_t ds1343_store_glitchfilter(struct device *dev,
131 struct device_attribute *attr,
132 const char *buf, size_t count)
133{
134 struct ds1343_priv *priv = dev_get_drvdata(dev);
135 int data;
136
137 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
138
139 if (strncmp(buf, "enabled", 7) == 0)
140 data |= DS1343_EGFIL;
141
142 else if (strncmp(buf, "disabled", 8) == 0)
143 data &= ~(DS1343_EGFIL);
144
145 else
146 return -EINVAL;
147
148 regmap_write(priv->map, DS1343_CONTROL_REG, data);
149
150 return count;
151}
152
153static DEVICE_ATTR(glitch_filter, S_IRUGO | S_IWUSR, ds1343_show_glitchfilter,
154 ds1343_store_glitchfilter);
155
156static ssize_t ds1343_nvram_write(struct file *filp, struct kobject *kobj,
157 struct bin_attribute *attr,
158 char *buf, loff_t off, size_t count)
159{
160 int ret;
161 unsigned char address;
162 struct device *dev = kobj_to_dev(kobj);
163 struct ds1343_priv *priv = dev_get_drvdata(dev);
164
165 address = DS1343_NVRAM + off;
166
167 ret = regmap_bulk_write(priv->map, address, buf, count);
168 if (ret < 0)
169 dev_err(&priv->spi->dev, "Error in nvram write %d", ret);
170
171 return (ret < 0) ? ret : count;
172}
173
174
175static ssize_t ds1343_nvram_read(struct file *filp, struct kobject *kobj,
176 struct bin_attribute *attr,
177 char *buf, loff_t off, size_t count)
178{
179 int ret;
180 unsigned char address;
181 struct device *dev = kobj_to_dev(kobj);
182 struct ds1343_priv *priv = dev_get_drvdata(dev);
183
184 address = DS1343_NVRAM + off;
185
186 ret = regmap_bulk_read(priv->map, address, buf, count);
187 if (ret < 0)
188 dev_err(&priv->spi->dev, "Error in nvram read %d\n", ret);
189
190 return (ret < 0) ? ret : count;
191}
192
193
194static struct bin_attribute nvram_attr = {
195 .attr.name = "nvram",
196 .attr.mode = S_IRUGO | S_IWUSR,
197 .read = ds1343_nvram_read,
198 .write = ds1343_nvram_write,
199 .size = DS1343_NVRAM_LEN,
200};
201
202static ssize_t ds1343_show_alarmstatus(struct device *dev,
203 struct device_attribute *attr, char *buf)
204{
205 struct ds1343_priv *priv = dev_get_drvdata(dev);
206 int alarmstatus, data;
207
208 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
209
210 alarmstatus = !!(data & DS1343_A0IE);
211
212 if (alarmstatus)
213 return sprintf(buf, "enabled\n");
214 else
215 return sprintf(buf, "disabled\n");
216}
217
218static DEVICE_ATTR(alarm_status, S_IRUGO, ds1343_show_alarmstatus, NULL);
219
220static ssize_t ds1343_show_alarmmode(struct device *dev,
221 struct device_attribute *attr, char *buf)
222{
223 struct ds1343_priv *priv = dev_get_drvdata(dev);
224 int alarm_mode, data;
225 char *alarm_str;
226
227 regmap_read(priv->map, DS1343_ALM0_SEC_REG, &data);
228 alarm_mode = (data & 0x80) >> 4;
229
230 regmap_read(priv->map, DS1343_ALM0_MIN_REG, &data);
231 alarm_mode |= (data & 0x80) >> 5;
232
233 regmap_read(priv->map, DS1343_ALM0_HOUR_REG, &data);
234 alarm_mode |= (data & 0x80) >> 6;
235
236 regmap_read(priv->map, DS1343_ALM0_DAY_REG, &data);
237 alarm_mode |= (data & 0x80) >> 7;
238
239 switch (alarm_mode) {
240 case 15:
241 alarm_str = "each second";
242 break;
243
244 case 7:
245 alarm_str = "seconds match";
246 break;
247
248 case 3:
249 alarm_str = "minutes and seconds match";
250 break;
251
252 case 1:
253 alarm_str = "hours, minutes and seconds match";
254 break;
255
256 case 0:
257 alarm_str = "day, hours, minutes and seconds match";
258 break;
259
260 default:
261 alarm_str = "invalid";
262 break;
263 }
264
265 return sprintf(buf, "%s\n", alarm_str);
266}
267
268static DEVICE_ATTR(alarm_mode, S_IRUGO, ds1343_show_alarmmode, NULL);
269
270static ssize_t ds1343_show_tricklecharger(struct device *dev,
271 struct device_attribute *attr, char *buf)
272{
273 struct ds1343_priv *priv = dev_get_drvdata(dev);
274 int data;
275 char *diodes = "disabled", *resistors = " ";
276
277 regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
278
279 if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
280 switch (data & 0x0c) {
281 case DS1343_TRICKLE_DS1:
282 diodes = "one diode,";
283 break;
284
285 default:
286 diodes = "no diode,";
287 break;
288 }
289
290 switch (data & 0x03) {
291 case DS1343_TRICKLE_1K:
292 resistors = "1k Ohm";
293 break;
294
295 case DS1343_TRICKLE_2K:
296 resistors = "2k Ohm";
297 break;
298
299 case DS1343_TRICKLE_4K:
300 resistors = "4k Ohm";
301 break;
302
303 default:
304 diodes = "disabled";
305 break;
306 }
307 }
308
309 return sprintf(buf, "%s %s\n", diodes, resistors);
310}
311
312static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
313
314static int ds1343_sysfs_register(struct device *dev)
315{
316 struct ds1343_priv *priv = dev_get_drvdata(dev);
317 int err;
318
319 err = device_create_file(dev, &dev_attr_glitch_filter);
320 if (err)
321 return err;
322
323 err = device_create_file(dev, &dev_attr_trickle_charger);
324 if (err)
325 goto error1;
326
327 err = device_create_bin_file(dev, &nvram_attr);
328 if (err)
329 goto error2;
330
331 if (priv->irq <= 0)
332 return err;
333
334 err = device_create_file(dev, &dev_attr_alarm_mode);
335 if (err)
336 goto error3;
337
338 err = device_create_file(dev, &dev_attr_alarm_status);
339 if (!err)
340 return err;
341
342 device_remove_file(dev, &dev_attr_alarm_mode);
343
344error3:
345 device_remove_bin_file(dev, &nvram_attr);
346
347error2:
348 device_remove_file(dev, &dev_attr_trickle_charger);
349
350error1:
351 device_remove_file(dev, &dev_attr_glitch_filter);
352
353 return err;
354}
355
356static void ds1343_sysfs_unregister(struct device *dev)
357{
358 struct ds1343_priv *priv = dev_get_drvdata(dev);
359
360 device_remove_file(dev, &dev_attr_glitch_filter);
361 device_remove_file(dev, &dev_attr_trickle_charger);
362 device_remove_bin_file(dev, &nvram_attr);
363
364 if (priv->irq <= 0)
365 return;
366
367 device_remove_file(dev, &dev_attr_alarm_status);
368 device_remove_file(dev, &dev_attr_alarm_mode);
369}
370
371static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
372{
373 struct ds1343_priv *priv = dev_get_drvdata(dev);
374 unsigned char buf[7];
375 int res;
376
377 res = regmap_bulk_read(priv->map, DS1343_SECONDS_REG, buf, 7);
378 if (res)
379 return res;
380
381 dt->tm_sec = bcd2bin(buf[0]);
382 dt->tm_min = bcd2bin(buf[1]);
383 dt->tm_hour = bcd2bin(buf[2] & 0x3F);
384 dt->tm_wday = bcd2bin(buf[3]) - 1;
385 dt->tm_mday = bcd2bin(buf[4]);
386 dt->tm_mon = bcd2bin(buf[5] & 0x1F) - 1;
387 dt->tm_year = bcd2bin(buf[6]) + 100; /* year offset from 1900 */
388
389 return rtc_valid_tm(dt);
390}
391
392static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
393{
394 struct ds1343_priv *priv = dev_get_drvdata(dev);
395 int res;
396
397 res = regmap_write(priv->map, DS1343_SECONDS_REG,
398 bin2bcd(dt->tm_sec));
399 if (res)
400 return res;
401
402 res = regmap_write(priv->map, DS1343_MINUTES_REG,
403 bin2bcd(dt->tm_min));
404 if (res)
405 return res;
406
407 res = regmap_write(priv->map, DS1343_HOURS_REG,
408 bin2bcd(dt->tm_hour) & 0x3F);
409 if (res)
410 return res;
411
412 res = regmap_write(priv->map, DS1343_DAY_REG,
413 bin2bcd(dt->tm_wday + 1));
414 if (res)
415 return res;
416
417 res = regmap_write(priv->map, DS1343_DATE_REG,
418 bin2bcd(dt->tm_mday));
419 if (res)
420 return res;
421
422 res = regmap_write(priv->map, DS1343_MONTH_REG,
423 bin2bcd(dt->tm_mon + 1));
424 if (res)
425 return res;
426
427 dt->tm_year %= 100;
428
429 res = regmap_write(priv->map, DS1343_YEAR_REG,
430 bin2bcd(dt->tm_year));
431 if (res)
432 return res;
433
434 return 0;
435}
436
437static int ds1343_update_alarm(struct device *dev)
438{
439 struct ds1343_priv *priv = dev_get_drvdata(dev);
440 unsigned int control, stat;
441 unsigned char buf[4];
442 int res = 0;
443
444 res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
445 if (res)
446 return res;
447
448 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
449 if (res)
450 return res;
451
452 control &= ~(DS1343_A0IE);
453 stat &= ~(DS1343_IRQF0);
454
455 res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
456 if (res)
457 return res;
458
459 res = regmap_write(priv->map, DS1343_STATUS_REG, stat);
460 if (res)
461 return res;
462
463 buf[0] = priv->alarm_sec < 0 || (priv->irqen & RTC_UF) ?
464 0x80 : bin2bcd(priv->alarm_sec) & 0x7F;
465 buf[1] = priv->alarm_min < 0 || (priv->irqen & RTC_UF) ?
466 0x80 : bin2bcd(priv->alarm_min) & 0x7F;
467 buf[2] = priv->alarm_hour < 0 || (priv->irqen & RTC_UF) ?
468 0x80 : bin2bcd(priv->alarm_hour) & 0x3F;
469 buf[3] = priv->alarm_mday < 0 || (priv->irqen & RTC_UF) ?
470 0x80 : bin2bcd(priv->alarm_mday) & 0x7F;
471
472 res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
473 if (res)
474 return res;
475
476 if (priv->irqen) {
477 control |= DS1343_A0IE;
478 res = regmap_write(priv->map, DS1343_CONTROL_REG, control);
479 }
480
481 return res;
482}
483
484static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
485{
486 struct ds1343_priv *priv = dev_get_drvdata(dev);
487 int res = 0;
488 unsigned int stat;
489
490 if (priv->irq <= 0)
491 return -EINVAL;
492
493 mutex_lock(&priv->mutex);
494
495 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
496 if (res)
497 goto out;
498
499 alarm->enabled = !!(priv->irqen & RTC_AF);
500 alarm->pending = !!(stat & DS1343_IRQF0);
501
502 alarm->time.tm_sec = priv->alarm_sec < 0 ? 0 : priv->alarm_sec;
503 alarm->time.tm_min = priv->alarm_min < 0 ? 0 : priv->alarm_min;
504 alarm->time.tm_hour = priv->alarm_hour < 0 ? 0 : priv->alarm_hour;
505 alarm->time.tm_mday = priv->alarm_mday < 0 ? 0 : priv->alarm_mday;
506
507out:
508 mutex_unlock(&priv->mutex);
509 return res;
510}
511
512static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
513{
514 struct ds1343_priv *priv = dev_get_drvdata(dev);
515 int res = 0;
516
517 if (priv->irq <= 0)
518 return -EINVAL;
519
520 mutex_lock(&priv->mutex);
521
522 priv->alarm_sec = alarm->time.tm_sec;
523 priv->alarm_min = alarm->time.tm_min;
524 priv->alarm_hour = alarm->time.tm_hour;
525 priv->alarm_mday = alarm->time.tm_mday;
526
527 if (alarm->enabled)
528 priv->irqen |= RTC_AF;
529
530 res = ds1343_update_alarm(dev);
531
532 mutex_unlock(&priv->mutex);
533
534 return res;
535}
536
537static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
538{
539 struct ds1343_priv *priv = dev_get_drvdata(dev);
540 int res = 0;
541
542 if (priv->irq <= 0)
543 return -EINVAL;
544
545 mutex_lock(&priv->mutex);
546
547 if (enabled)
548 priv->irqen |= RTC_AF;
549 else
550 priv->irqen &= ~RTC_AF;
551
552 res = ds1343_update_alarm(dev);
553
554 mutex_unlock(&priv->mutex);
555
556 return res;
557}
558
559static irqreturn_t ds1343_thread(int irq, void *dev_id)
560{
561 struct ds1343_priv *priv = dev_id;
562 unsigned int stat, control;
563 int res = 0;
564
565 mutex_lock(&priv->mutex);
566
567 res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
568 if (res)
569 goto out;
570
571 if (stat & DS1343_IRQF0) {
572 stat &= ~DS1343_IRQF0;
573 regmap_write(priv->map, DS1343_STATUS_REG, stat);
574
575 res = regmap_read(priv->map, DS1343_CONTROL_REG, &control);
576 if (res)
577 goto out;
578
579 control &= ~DS1343_A0IE;
580 regmap_write(priv->map, DS1343_CONTROL_REG, control);
581
582 rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
583 }
584
585out:
586 mutex_unlock(&priv->mutex);
587 return IRQ_HANDLED;
588}
589
590static const struct rtc_class_ops ds1343_rtc_ops = {
591 .ioctl = ds1343_ioctl,
592 .read_time = ds1343_read_time,
593 .set_time = ds1343_set_time,
594 .read_alarm = ds1343_read_alarm,
595 .set_alarm = ds1343_set_alarm,
596 .alarm_irq_enable = ds1343_alarm_irq_enable,
597};
598
599static int ds1343_probe(struct spi_device *spi)
600{
601 struct ds1343_priv *priv;
602 struct regmap_config config;
603 unsigned int data;
604 int res;
605
606 memset(&config, 0, sizeof(config));
607 config.reg_bits = 8;
608 config.val_bits = 8;
609 config.write_flag_mask = 0x80;
610
611 priv = devm_kzalloc(&spi->dev, sizeof(struct ds1343_priv), GFP_KERNEL);
612 if (!priv)
613 return -ENOMEM;
614
615 priv->spi = spi;
616 mutex_init(&priv->mutex);
617
618 /* RTC DS1347 works in spi mode 3 and
619 * its chip select is active high
620 */
621 spi->mode = SPI_MODE_3 | SPI_CS_HIGH;
622 spi->bits_per_word = 8;
623 res = spi_setup(spi);
624 if (res)
625 return res;
626
627 spi_set_drvdata(spi, priv);
628
629 priv->map = devm_regmap_init_spi(spi, &config);
630
631 if (IS_ERR(priv->map)) {
632 dev_err(&spi->dev, "spi regmap init failed for rtc ds1343\n");
633 return PTR_ERR(priv->map);
634 }
635
636 res = regmap_read(priv->map, DS1343_SECONDS_REG, &data);
637 if (res)
638 return res;
639
640 regmap_read(priv->map, DS1343_CONTROL_REG, &data);
641 data |= DS1343_INTCN;
642 data &= ~(DS1343_EOSC | DS1343_A1IE | DS1343_A0IE);
643 regmap_write(priv->map, DS1343_CONTROL_REG, data);
644
645 regmap_read(priv->map, DS1343_STATUS_REG, &data);
646 data &= ~(DS1343_OSF | DS1343_IRQF1 | DS1343_IRQF0);
647 regmap_write(priv->map, DS1343_STATUS_REG, data);
648
649 priv->rtc = devm_rtc_device_register(&spi->dev, "ds1343",
650 &ds1343_rtc_ops, THIS_MODULE);
651 if (IS_ERR(priv->rtc)) {
652 dev_err(&spi->dev, "unable to register rtc ds1343\n");
653 return PTR_ERR(priv->rtc);
654 }
655
656 priv->irq = spi->irq;
657
658 if (priv->irq >= 0) {
659 res = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
660 ds1343_thread, IRQF_ONESHOT,
661 "ds1343", priv);
662 if (res) {
663 priv->irq = -1;
664 dev_err(&spi->dev,
665 "unable to request irq for rtc ds1343\n");
666 } else {
667 device_init_wakeup(&spi->dev, true);
668 dev_pm_set_wake_irq(&spi->dev, spi->irq);
669 }
670 }
671
672 res = ds1343_sysfs_register(&spi->dev);
673 if (res)
674 dev_err(&spi->dev,
675 "unable to create sysfs entries for rtc ds1343\n");
676
677 return 0;
678}
679
680static int ds1343_remove(struct spi_device *spi)
681{
682 struct ds1343_priv *priv = spi_get_drvdata(spi);
683
684 if (spi->irq) {
685 mutex_lock(&priv->mutex);
686 priv->irqen &= ~RTC_AF;
687 mutex_unlock(&priv->mutex);
688
689 dev_pm_clear_wake_irq(&spi->dev);
690 device_init_wakeup(&spi->dev, false);
691 devm_free_irq(&spi->dev, spi->irq, priv);
692 }
693
694 spi_set_drvdata(spi, NULL);
695
696 ds1343_sysfs_unregister(&spi->dev);
697
698 return 0;
699}
700
701#ifdef CONFIG_PM_SLEEP
702
703static int ds1343_suspend(struct device *dev)
704{
705 struct spi_device *spi = to_spi_device(dev);
706
707 if (spi->irq >= 0 && device_may_wakeup(dev))
708 enable_irq_wake(spi->irq);
709
710 return 0;
711}
712
713static int ds1343_resume(struct device *dev)
714{
715 struct spi_device *spi = to_spi_device(dev);
716
717 if (spi->irq >= 0 && device_may_wakeup(dev))
718 disable_irq_wake(spi->irq);
719
720 return 0;
721}
722
723#endif
724
725static SIMPLE_DEV_PM_OPS(ds1343_pm, ds1343_suspend, ds1343_resume);
726
727static struct spi_driver ds1343_driver = {
728 .driver = {
729 .name = "ds1343",
730 .pm = &ds1343_pm,
731 },
732 .probe = ds1343_probe,
733 .remove = ds1343_remove,
734 .id_table = ds1343_id,
735};
736
737module_spi_driver(ds1343_driver);
738
739MODULE_DESCRIPTION("DS1343 RTC SPI Driver");
740MODULE_AUTHOR("Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>,"
741 "Ankur Srivastava <sankurece@gmail.com>");
742MODULE_LICENSE("GPL v2");