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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/drivers/rtc/rtc-ab8500.c
....@@ -1,7 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) ST-Ericsson SA 2010
34  *
4
- * License terms: GNU General Public License (GPL) version 2
55  * Author: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
66  *
77  * RTC clock driver for the RTC part of the AB8500 Power management chip.
....@@ -46,7 +46,6 @@
4646 #define RTC_STATUS_DATA			0x01
4747 
4848 #define COUNTS_PER_SEC			(0xF000 / 60)
49
-#define AB8500_RTC_EPOCH		2000
5049 
5150 static const u8 ab8500_rtc_time_regs[] = {
5251 	AB8500_RTC_WATCH_TMIN_HI_REG, AB8500_RTC_WATCH_TMIN_MID_REG,
....@@ -58,23 +57,6 @@
5857 	AB8500_RTC_ALRM_MIN_HI_REG, AB8500_RTC_ALRM_MIN_MID_REG,
5958 	AB8500_RTC_ALRM_MIN_LOW_REG
6059 };
61
-
62
-/* Calculate the seconds from 1970 to 01-01-2000 00:00:00 */
63
-static unsigned long get_elapsed_seconds(int year)
64
-{
65
-	unsigned long secs;
66
-	struct rtc_time tm = {
67
-		.tm_year = year - 1900,
68
-		.tm_mday = 1,
69
-	};
70
-
71
-	/*
72
-	 * This function calculates secs from 1970 and not from
73
-	 * 1900, even if we supply the offset from year 1900.
74
-	 */
75
-	rtc_tm_to_time(&tm, &secs);
76
-	return secs;
77
-}
7860 
7961 static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
8062 {
....@@ -118,10 +100,7 @@
118100 	secs =	secs / COUNTS_PER_SEC;
119101 	secs =	secs + (mins * 60);
120102 
121
-	/* Add back the initially subtracted number of seconds */
122
-	secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
123
-
124
-	rtc_time_to_tm(secs, tm);
103
+	rtc_time64_to_tm(secs, tm);
125104 	return 0;
126105 }
127106 
....@@ -131,20 +110,7 @@
131110 	unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
132111 	unsigned long no_secs, no_mins, secs = 0;
133112 
134
-	if (tm->tm_year < (AB8500_RTC_EPOCH - 1900)) {
135
-		dev_dbg(dev, "year should be equal to or greater than %d\n",
136
-				AB8500_RTC_EPOCH);
137
-		return -EINVAL;
138
-	}
139
-
140
-	/* Get the number of seconds since 1970 */
141
-	rtc_tm_to_time(tm, &secs);
142
-
143
-	/*
144
-	 * Convert it to the number of seconds since 01-01-2000 00:00:00, since
145
-	 * we only have a small counter in the RTC.
146
-	 */
147
-	secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
113
+	secs = rtc_tm_to_time64(tm);
148114 
149115 	no_mins = secs / 60;
150116 
....@@ -202,12 +168,9 @@
202168 	mins = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
203169 	secs = mins * 60;
204170 
205
-	/* Add back the initially subtracted number of seconds */
206
-	secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
171
+	rtc_time64_to_tm(secs, &alarm->time);
207172 
208
-	rtc_time_to_tm(secs, &alarm->time);
209
-
210
-	return rtc_valid_tm(&alarm->time);
173
+	return 0;
211174 }
212175 
213176 static int ab8500_rtc_irq_enable(struct device *dev, unsigned int enabled)
....@@ -224,14 +187,8 @@
224187 	unsigned long mins, secs = 0, cursec = 0;
225188 	struct rtc_time curtm;
226189 
227
-	if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
228
-		dev_dbg(dev, "year should be equal to or greater than %d\n",
229
-				AB8500_RTC_EPOCH);
230
-		return -EINVAL;
231
-	}
232
-
233190 	/* Get the number of seconds since 1970 */
234
-	rtc_tm_to_time(&alarm->time, &secs);
191
+	secs = rtc_tm_to_time64(&alarm->time);
235192 
236193 	/*
237194 	 * Check whether alarm is set less than 1min.
....@@ -239,17 +196,11 @@
239196 	 * return -EINVAL, so UIE EMUL can take it up, incase of UIE_ON
240197 	 */
241198 	ab8500_rtc_read_time(dev, &curtm); /* Read current time */
242
-	rtc_tm_to_time(&curtm, &cursec);
199
+	cursec = rtc_tm_to_time64(&curtm);
243200 	if ((secs - cursec) < 59) {
244201 		dev_dbg(dev, "Alarm less than 1 minute not supported\r\n");
245202 		return -EINVAL;
246203 	}
247
-
248
-	/*
249
-	 * Convert it to the number of seconds since 01-01-2000 00:00:00, since
250
-	 * we only have a small counter in the RTC.
251
-	 */
252
-	secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
253204 
254205 	mins = secs / 60;
255206 
....@@ -360,15 +311,14 @@
360311 		   ab8500_sysfs_show_rtc_calibration,
361312 		   ab8500_sysfs_store_rtc_calibration);
362313 
363
-static int ab8500_sysfs_rtc_register(struct device *dev)
364
-{
365
-	return device_create_file(dev, &dev_attr_rtc_calibration);
366
-}
314
+static struct attribute *ab8500_rtc_attrs[] = {
315
+	&dev_attr_rtc_calibration.attr,
316
+	NULL
317
+};
367318 
368
-static void ab8500_sysfs_rtc_unregister(struct device *dev)
369
-{
370
-	device_remove_file(dev, &dev_attr_rtc_calibration);
371
-}
319
+static const struct attribute_group ab8500_rtc_sysfs_files = {
320
+	.attrs	= ab8500_rtc_attrs,
321
+};
372322 
373323 static irqreturn_t rtc_alarm_handler(int irq, void *data)
374324 {
....@@ -429,14 +379,11 @@
429379 
430380 	device_init_wakeup(&pdev->dev, true);
431381 
432
-	rtc = devm_rtc_device_register(&pdev->dev, "ab8500-rtc",
433
-				(struct rtc_class_ops *)platid->driver_data,
434
-				THIS_MODULE);
435
-	if (IS_ERR(rtc)) {
436
-		dev_err(&pdev->dev, "Registration failed\n");
437
-		err = PTR_ERR(rtc);
438
-		return err;
439
-	}
382
+	rtc = devm_rtc_allocate_device(&pdev->dev);
383
+	if (IS_ERR(rtc))
384
+		return PTR_ERR(rtc);
385
+
386
+	rtc->ops = (struct rtc_class_ops *)platid->driver_data;
440387 
441388 	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
442389 			rtc_alarm_handler, IRQF_ONESHOT,
....@@ -447,22 +394,23 @@
447394 	dev_pm_set_wake_irq(&pdev->dev, irq);
448395 	platform_set_drvdata(pdev, rtc);
449396 
450
-	err = ab8500_sysfs_rtc_register(&pdev->dev);
451
-	if (err) {
452
-		dev_err(&pdev->dev, "sysfs RTC failed to register\n");
453
-		return err;
454
-	}
455
-
456397 	rtc->uie_unsupported = 1;
457398 
458
-	return 0;
399
+	rtc->range_max = (1ULL << 24) * 60 - 1; // 24-bit minutes + 59 secs
400
+	rtc->start_secs = RTC_TIMESTAMP_BEGIN_2000;
401
+	rtc->set_start_time = true;
402
+
403
+	err = rtc_add_group(rtc, &ab8500_rtc_sysfs_files);
404
+	if (err)
405
+		return err;
406
+
407
+	return rtc_register_device(rtc);
459408 }
460409 
461410 static int ab8500_rtc_remove(struct platform_device *pdev)
462411 {
463412 	dev_pm_clear_wake_irq(&pdev->dev);
464413 	device_init_wakeup(&pdev->dev, false);
465
-	ab8500_sysfs_rtc_unregister(&pdev->dev);
466414 
467415 	return 0;
468416 }