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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/rtc/rtc-ds1343.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /* rtc-ds1343.c
2
3
  *
3
4
  * Driver for Dallas Semiconductor DS1343 Low Current, SPI Compatible
..
..
@@ -5,11 +6,6 @@
5
6
  *
6
7
  * Author : Raghavendra Chandra Ganiga <ravi23ganiga@gmail.com>
7
8
  *	    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
9
  */
14
10
 
15
11
 #include <linux/init.h>
..
..
@@ -79,45 +75,21 @@
79
75
 MODULE_DEVICE_TABLE(spi, ds1343_id);
80
76
 
81
77
 struct ds1343_priv {
82
-	struct spi_device *spi;
83
78
 	struct rtc_device *rtc;
84
79
 	struct regmap *map;
85
-	struct mutex mutex;
86
-	unsigned int irqen;
87
80
 	int irq;
88
-	int alarm_sec;
89
-	int alarm_min;
90
-	int alarm_hour;
91
-	int alarm_mday;
92
81
 };
93
-
94
-static 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
82
 
114
83
 static ssize_t ds1343_show_glitchfilter(struct device *dev,
115
84
 				struct device_attribute *attr, char *buf)
116
85
 {
117
-	struct ds1343_priv *priv = dev_get_drvdata(dev);
86
+	struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
118
87
 	int glitch_filt_status, data;
88
+	int res;
119
89
 
120
-	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
90
+	res = regmap_read(priv->map, DS1343_CONTROL_REG, &data);
91
+	if (res)
92
+		return res;
121
93
 
122
94
 	glitch_filt_status = !!(data & DS1343_EGFIL);
123
95
 
..
..
@@ -131,21 +103,19 @@
131
103
 					struct device_attribute *attr,
132
104
 					const char *buf, size_t count)
133
105
 {
134
-	struct ds1343_priv *priv = dev_get_drvdata(dev);
135
-	int data;
136
-
137
-	regmap_read(priv->map, DS1343_CONTROL_REG, &data);
106
+	struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
107
+	int data = 0;
108
+	int res;
138
109
 
139
110
 	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
111
+		data = DS1343_EGFIL;
112
+	else if (strncmp(buf, "disabled", 8))
146
113
 		return -EINVAL;
147
114
 
148
-	regmap_write(priv->map, DS1343_CONTROL_REG, data);
115
+	res = regmap_update_bits(priv->map, DS1343_CONTROL_REG,
116
+				 DS1343_EGFIL, data);
117
+	if (res)
118
+		return res;
149
119
 
150
120
 	return count;
151
121
 }
..
..
@@ -172,11 +142,13 @@
172
142
 static ssize_t ds1343_show_tricklecharger(struct device *dev,
173
143
 				struct device_attribute *attr, char *buf)
174
144
 {
175
-	struct ds1343_priv *priv = dev_get_drvdata(dev);
176
-	int data;
145
+	struct ds1343_priv *priv = dev_get_drvdata(dev->parent);
146
+	int res, data;
177
147
 	char *diodes = "disabled", *resistors = " ";
178
148
 
179
-	regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
149
+	res = regmap_read(priv->map, DS1343_TRICKLE_REG, &data);
150
+	if (res)
151
+		return res;
180
152
 
181
153
 	if ((data & 0xf0) == DS1343_TRICKLE_MAGIC) {
182
154
 		switch (data & 0x0c) {
..
..
@@ -213,28 +185,15 @@
213
185
 
214
186
 static DEVICE_ATTR(trickle_charger, S_IRUGO, ds1343_show_tricklecharger, NULL);
215
187
 
216
-static int ds1343_sysfs_register(struct device *dev)
217
-{
218
-	int err;
188
+static struct attribute *ds1343_attrs[] = {
189
+	&dev_attr_glitch_filter.attr,
190
+	&dev_attr_trickle_charger.attr,
191
+	NULL
192
+};
219
193
 
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
-
233
-static 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
-}
194
+static const struct attribute_group ds1343_attr_group = {
195
+	.attrs  = ds1343_attrs,
196
+};
238
197
 
239
198
 static int ds1343_read_time(struct device *dev, struct rtc_time *dt)
240
199
 {
..
..
@@ -260,144 +219,78 @@
260
219
 static int ds1343_set_time(struct device *dev, struct rtc_time *dt)
261
220
 {
262
221
 	struct ds1343_priv *priv = dev_get_drvdata(dev);
263
-	int res;
222
+	u8 buf[7];
264
223
 
265
-	res = regmap_write(priv->map, DS1343_SECONDS_REG,
266
-				bin2bcd(dt->tm_sec));
267
-	if (res)
268
-		return res;
224
+	buf[0] = bin2bcd(dt->tm_sec);
225
+	buf[1] = bin2bcd(dt->tm_min);
226
+	buf[2] = bin2bcd(dt->tm_hour) & 0x3F;
227
+	buf[3] = bin2bcd(dt->tm_wday + 1);
228
+	buf[4] = bin2bcd(dt->tm_mday);
229
+	buf[5] = bin2bcd(dt->tm_mon + 1);
230
+	buf[6] = bin2bcd(dt->tm_year - 100);
269
231
 
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
-
305
-static 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;
232
+	return regmap_bulk_write(priv->map, DS1343_SECONDS_REG,
233
+				 buf, sizeof(buf));
350
234
 }
351
235
 
352
236
 static int ds1343_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
353
237
 {
354
238
 	struct ds1343_priv *priv = dev_get_drvdata(dev);
355
-	int res = 0;
356
-	unsigned int stat;
239
+	unsigned char buf[4];
240
+	unsigned int val;
241
+	int res;
357
242
 
358
243
 	if (priv->irq <= 0)
359
244
 		return -EINVAL;
360
245
 
361
-	mutex_lock(&priv->mutex);
362
-
363
-	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
246
+	res = regmap_read(priv->map, DS1343_STATUS_REG, &val);
364
247
 	if (res)
365
-		goto out;
248
+		return res;
366
249
 
367
-	alarm->enabled = !!(priv->irqen & RTC_AF);
368
-	alarm->pending = !!(stat & DS1343_IRQF0);
250
+	alarm->pending = !!(val & DS1343_IRQF0);
369
251
 
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;
252
+	res = regmap_read(priv->map, DS1343_CONTROL_REG, &val);
253
+	if (res)
254
+		return res;
255
+	alarm->enabled = !!(val & DS1343_A0IE);
374
256
 
375
-out:
376
-	mutex_unlock(&priv->mutex);
377
-	return res;
257
+	res = regmap_bulk_read(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
258
+	if (res)
259
+		return res;
260
+
261
+	alarm->time.tm_sec = bcd2bin(buf[0]) & 0x7f;
262
+	alarm->time.tm_min = bcd2bin(buf[1]) & 0x7f;
263
+	alarm->time.tm_hour = bcd2bin(buf[2]) & 0x3f;
264
+	alarm->time.tm_mday = bcd2bin(buf[3]) & 0x3f;
265
+
266
+	return 0;
378
267
 }
379
268
 
380
269
 static int ds1343_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
381
270
 {
382
271
 	struct ds1343_priv *priv = dev_get_drvdata(dev);
272
+	unsigned char buf[4];
383
273
 	int res = 0;
384
274
 
385
275
 	if (priv->irq <= 0)
386
276
 		return -EINVAL;
387
277
 
388
-	mutex_lock(&priv->mutex);
278
+	res = regmap_update_bits(priv->map, DS1343_CONTROL_REG, DS1343_A0IE, 0);
279
+	if (res)
280
+		return res;
389
281
 
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;
282
+	buf[0] = bin2bcd(alarm->time.tm_sec);
283
+	buf[1] = bin2bcd(alarm->time.tm_min);
284
+	buf[2] = bin2bcd(alarm->time.tm_hour);
285
+	buf[3] = bin2bcd(alarm->time.tm_mday);
286
+
287
+	res = regmap_bulk_write(priv->map, DS1343_ALM0_SEC_REG, buf, 4);
288
+	if (res)
289
+		return res;
394
290
 
395
291
 	if (alarm->enabled)
396
-		priv->irqen |= RTC_AF;
397
-
398
-	res = ds1343_update_alarm(dev);
399
-
400
-	mutex_unlock(&priv->mutex);
292
+		res = regmap_update_bits(priv->map, DS1343_CONTROL_REG,
293
+					 DS1343_A0IE, DS1343_A0IE);
401
294
 
402
295
 	return res;
403
296
 }
..
..
@@ -405,32 +298,21 @@
405
298
 static int ds1343_alarm_irq_enable(struct device *dev, unsigned int enabled)
406
299
 {
407
300
 	struct ds1343_priv *priv = dev_get_drvdata(dev);
408
-	int res = 0;
409
301
 
410
302
 	if (priv->irq <= 0)
411
303
 		return -EINVAL;
412
304
 
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;
305
+	return regmap_update_bits(priv->map, DS1343_CONTROL_REG,
306
+				  DS1343_A0IE, enabled ? DS1343_A0IE : 0);
425
307
 }
426
308
 
427
309
 static irqreturn_t ds1343_thread(int irq, void *dev_id)
428
310
 {
429
311
 	struct ds1343_priv *priv = dev_id;
430
-	unsigned int stat, control;
312
+	unsigned int stat;
431
313
 	int res = 0;
432
314
 
433
-	mutex_lock(&priv->mutex);
315
+	rtc_lock(priv->rtc);
434
316
 
435
317
 	res = regmap_read(priv->map, DS1343_STATUS_REG, &stat);
436
318
 	if (res)
..
..
@@ -440,23 +322,18 @@
440
322
 		stat &= ~DS1343_IRQF0;
441
323
 		regmap_write(priv->map, DS1343_STATUS_REG, stat);
442
324
 
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
325
 		rtc_update_irq(priv->rtc, 1, RTC_AF | RTC_IRQF);
326
+
327
+		regmap_update_bits(priv->map, DS1343_CONTROL_REG,
328
+				   DS1343_A0IE, 0);
451
329
 	}
452
330
 
453
331
 out:
454
-	mutex_unlock(&priv->mutex);
332
+	rtc_unlock(priv->rtc);
455
333
 	return IRQ_HANDLED;
456
334
 }
457
335
 
458
336
 static const struct rtc_class_ops ds1343_rtc_ops = {
459
-	.ioctl		= ds1343_ioctl,
460
337
 	.read_time	= ds1343_read_time,
461
338
 	.set_time	= ds1343_set_time,
462
339
 	.read_alarm	= ds1343_read_alarm,
..
..
@@ -484,13 +361,13 @@
484
361
 	if (!priv)
485
362
 		return -ENOMEM;
486
363
 
487
-	priv->spi = spi;
488
-	mutex_init(&priv->mutex);
489
-
490
364
 	/* RTC DS1347 works in spi mode 3 and
491
-	 * its chip select is active high
365
+	 * its chip select is active high. Active high should be defined as
366
+	 * "inverse polarity" as GPIO-based chip selects can be logically
367
+	 * active high but inverted by the GPIO library.
492
368
 	 */
493
-	spi->mode = SPI_MODE_3 | SPI_CS_HIGH;
369
+	spi->mode |= SPI_MODE_3;
370
+	spi->mode ^= SPI_CS_HIGH;
494
371
 	spi->bits_per_word = 8;
495
372
 	res = spi_setup(spi);
496
373
 	if (res)
..
..
@@ -524,6 +401,13 @@
524
401
 
525
402
 	priv->rtc->nvram_old_abi = true;
526
403
 	priv->rtc->ops = &ds1343_rtc_ops;
404
+	priv->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
405
+	priv->rtc->range_max = RTC_TIMESTAMP_END_2099;
406
+
407
+	res = rtc_add_group(priv->rtc, &ds1343_attr_group);
408
+	if (res)
409
+		dev_err(&spi->dev,
410
+			"unable to create sysfs entries for rtc ds1343\n");
527
411
 
528
412
 	res = rtc_register_device(priv->rtc);
529
413
 	if (res)
..
..
@@ -548,31 +432,12 @@
548
432
 		}
549
433
 	}
550
434
 
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
435
 	return 0;
557
436
 }
558
437
 
559
438
 static int ds1343_remove(struct spi_device *spi)
560
439
 {
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);
440
+	dev_pm_clear_wake_irq(&spi->dev);
576
441
 
577
442
 	return 0;
578
443
 }