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Alessandro Zummob5a82d62006-03-27 01:16:44 -08001/*
2 * An I2C driver for the Philips PCF8563 RTC
3 * Copyright 2005-06 Tower Technologies
4 *
5 * Author: Alessandro Zummo <a.zummo@towertech.it>
6 * Maintainers: http://www.nslu2-linux.org/
7 *
8 * based on the other drivers in this same directory.
9 *
10 * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/i2c.h>
18#include <linux/bcd.h>
19#include <linux/rtc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Paul Gortmaker21138522011-05-27 09:57:25 -040021#include <linux/module.h>
Nick Bowler8dccaf02012-07-30 14:41:59 -070022#include <linux/of.h>
Sachin Kamat23f809e2013-07-03 15:07:51 -070023#include <linux/err.h>
Alessandro Zummob5a82d62006-03-27 01:16:44 -080024
Jan Kardell538330c2015-05-28 08:48:45 +020025#define DRV_VERSION "0.4.4"
Alessandro Zummob5a82d62006-03-27 01:16:44 -080026
27#define PCF8563_REG_ST1 0x00 /* status */
28#define PCF8563_REG_ST2 0x01
Vincent Donnefortede3e9d2014-08-08 14:20:18 -070029#define PCF8563_BIT_AIE (1 << 1)
30#define PCF8563_BIT_AF (1 << 3)
Jan Kardell45ef0452014-12-10 15:53:34 -080031#define PCF8563_BITS_ST2_N (7 << 5)
Alessandro Zummob5a82d62006-03-27 01:16:44 -080032
33#define PCF8563_REG_SC 0x02 /* datetime */
34#define PCF8563_REG_MN 0x03
35#define PCF8563_REG_HR 0x04
36#define PCF8563_REG_DM 0x05
37#define PCF8563_REG_DW 0x06
38#define PCF8563_REG_MO 0x07
39#define PCF8563_REG_YR 0x08
40
41#define PCF8563_REG_AMN 0x09 /* alarm */
Alessandro Zummob5a82d62006-03-27 01:16:44 -080042
43#define PCF8563_REG_CLKO 0x0D /* clock out */
44#define PCF8563_REG_TMRC 0x0E /* timer control */
Jan Kardellff0bc502014-12-10 15:53:43 -080045#define PCF8563_TMRC_ENABLE BIT(7)
46#define PCF8563_TMRC_4096 0
47#define PCF8563_TMRC_64 1
48#define PCF8563_TMRC_1 2
49#define PCF8563_TMRC_1_60 3
50#define PCF8563_TMRC_MASK 3
51
Alessandro Zummob5a82d62006-03-27 01:16:44 -080052#define PCF8563_REG_TMR 0x0F /* timer */
53
54#define PCF8563_SC_LV 0x80 /* low voltage */
55#define PCF8563_MO_C 0x80 /* century */
56
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -070057static struct i2c_driver pcf8563_driver;
58
Atsushi Nemotocbb94502007-02-08 14:20:24 -080059struct pcf8563 {
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -070060 struct rtc_device *rtc;
Atsushi Nemotocbb94502007-02-08 14:20:24 -080061 /*
62 * The meaning of MO_C bit varies by the chip type.
63 * From PCF8563 datasheet: this bit is toggled when the years
64 * register overflows from 99 to 00
65 * 0 indicates the century is 20xx
66 * 1 indicates the century is 19xx
67 * From RTC8564 datasheet: this bit indicates change of
68 * century. When the year digit data overflows from 99 to 00,
69 * this bit is set. By presetting it to 0 while still in the
70 * 20th century, it will be set in year 2000, ...
71 * There seems no reliable way to know how the system use this
72 * bit. So let's do it heuristically, assuming we are live in
73 * 1970...2069.
74 */
75 int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
Alexander Stein0f20b762012-05-29 15:07:36 -070076 int voltage_low; /* incicates if a low_voltage was detected */
Vincent Donnefortede3e9d2014-08-08 14:20:18 -070077
78 struct i2c_client *client;
Atsushi Nemotocbb94502007-02-08 14:20:24 -080079};
80
Vincent Donnefort2784366c2014-08-08 14:20:16 -070081static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
82 unsigned char length, unsigned char *buf)
83{
84 struct i2c_msg msgs[] = {
85 {/* setup read ptr */
86 .addr = client->addr,
87 .len = 1,
88 .buf = &reg,
89 },
90 {
91 .addr = client->addr,
92 .flags = I2C_M_RD,
93 .len = length,
94 .buf = buf
95 },
96 };
97
98 if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
99 dev_err(&client->dev, "%s: read error\n", __func__);
100 return -EIO;
101 }
102
103 return 0;
104}
105
106static int pcf8563_write_block_data(struct i2c_client *client,
107 unsigned char reg, unsigned char length,
108 unsigned char *buf)
109{
110 int i, err;
111
112 for (i = 0; i < length; i++) {
113 unsigned char data[2] = { reg + i, buf[i] };
114
115 err = i2c_master_send(client, data, sizeof(data));
116 if (err != sizeof(data)) {
117 dev_err(&client->dev,
118 "%s: err=%d addr=%02x, data=%02x\n",
119 __func__, err, data[0], data[1]);
120 return -EIO;
121 }
122 }
123
124 return 0;
125}
126
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700127static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
128{
Jan Kardell17a1e5e2014-12-10 15:53:31 -0800129 unsigned char buf;
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700130 int err;
131
Jan Kardell17a1e5e2014-12-10 15:53:31 -0800132 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700133 if (err < 0)
134 return err;
135
136 if (on)
Jan Kardell17a1e5e2014-12-10 15:53:31 -0800137 buf |= PCF8563_BIT_AIE;
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700138 else
Jan Kardell17a1e5e2014-12-10 15:53:31 -0800139 buf &= ~PCF8563_BIT_AIE;
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700140
Jan Kardell45ef0452014-12-10 15:53:34 -0800141 buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700142
Jan Kardell17a1e5e2014-12-10 15:53:31 -0800143 err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700144 if (err < 0) {
145 dev_err(&client->dev, "%s: write error\n", __func__);
146 return -EIO;
147 }
148
149 return 0;
150}
151
152static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
153 unsigned char *pen)
154{
155 unsigned char buf;
156 int err;
157
158 err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
159 if (err)
160 return err;
161
162 if (en)
163 *en = !!(buf & PCF8563_BIT_AIE);
164 if (pen)
165 *pen = !!(buf & PCF8563_BIT_AF);
166
167 return 0;
168}
169
170static irqreturn_t pcf8563_irq(int irq, void *dev_id)
171{
172 struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
173 int err;
174 char pending;
175
176 err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
Arnd Bergmanne698a512014-10-13 15:53:07 -0700177 if (err)
Arnd Bergmann3ff38232014-10-13 15:53:10 -0700178 return IRQ_NONE;
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700179
180 if (pending) {
181 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
182 pcf8563_set_alarm_mode(pcf8563->client, 1);
183 return IRQ_HANDLED;
184 }
185
186 return IRQ_NONE;
187}
188
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800189/*
190 * In the routines that deal directly with the pcf8563 hardware, we use
191 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
192 */
193static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
194{
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700195 struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
Vincent Donnefort2784366c2014-08-08 14:20:16 -0700196 unsigned char buf[9];
197 int err;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800198
Vincent Donnefort2784366c2014-08-08 14:20:16 -0700199 err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
200 if (err)
201 return err;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800202
Alexander Stein0f20b762012-05-29 15:07:36 -0700203 if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
204 pcf8563->voltage_low = 1;
Jan Kardell538330c2015-05-28 08:48:45 +0200205 dev_err(&client->dev,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800206 "low voltage detected, date/time is not reliable.\n");
Jan Kardell538330c2015-05-28 08:48:45 +0200207 return -EINVAL;
Alexander Stein0f20b762012-05-29 15:07:36 -0700208 }
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800209
210 dev_dbg(&client->dev,
211 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
212 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700213 __func__,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800214 buf[0], buf[1], buf[2], buf[3],
215 buf[4], buf[5], buf[6], buf[7],
216 buf[8]);
217
218
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700219 tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
220 tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
221 tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
222 tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800223 tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700224 tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
225 tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
Atsushi Nemotocbb94502007-02-08 14:20:24 -0800226 if (tm->tm_year < 70)
227 tm->tm_year += 100; /* assume we are in 1970...2069 */
228 /* detect the polarity heuristically. see note above. */
229 pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
230 (tm->tm_year >= 100) : (tm->tm_year < 100);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800231
232 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
233 "mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700234 __func__,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800235 tm->tm_sec, tm->tm_min, tm->tm_hour,
236 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
237
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800238 return 0;
239}
240
241static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
242{
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700243 struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800244 unsigned char buf[9];
245
246 dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
247 "mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700248 __func__,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800249 tm->tm_sec, tm->tm_min, tm->tm_hour,
250 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
251
252 /* hours, minutes and seconds */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700253 buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
254 buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
255 buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800256
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700257 buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800258
259 /* month, 1 - 12 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700260 buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800261
262 /* year and century */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700263 buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
Atsushi Nemotocbb94502007-02-08 14:20:24 -0800264 if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800265 buf[PCF8563_REG_MO] |= PCF8563_MO_C;
266
267 buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
268
Robert Kmiecb0c57b52015-04-16 12:45:01 -0700269 return pcf8563_write_block_data(client, PCF8563_REG_SC,
Vincent Donnefort2784366c2014-08-08 14:20:16 -0700270 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800271}
272
Alexander Stein0f20b762012-05-29 15:07:36 -0700273#ifdef CONFIG_RTC_INTF_DEV
274static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
275{
276 struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
277 struct rtc_time tm;
278
279 switch (cmd) {
280 case RTC_VL_READ:
281 if (pcf8563->voltage_low)
282 dev_info(dev, "low voltage detected, date/time is not reliable.\n");
283
284 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
285 sizeof(int)))
286 return -EFAULT;
287 return 0;
288 case RTC_VL_CLR:
289 /*
290 * Clear the VL bit in the seconds register in case
291 * the time has not been set already (which would
292 * have cleared it). This does not really matter
293 * because of the cached voltage_low value but do it
294 * anyway for consistency.
295 */
296 if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
297 pcf8563_set_datetime(to_i2c_client(dev), &tm);
298
299 /* Clear the cached value. */
300 pcf8563->voltage_low = 0;
301
302 return 0;
303 default:
304 return -ENOIOCTLCMD;
305 }
306}
307#else
308#define pcf8563_rtc_ioctl NULL
309#endif
310
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800311static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
312{
313 return pcf8563_get_datetime(to_i2c_client(dev), tm);
314}
315
316static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
317{
318 return pcf8563_set_datetime(to_i2c_client(dev), tm);
319}
320
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700321static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
322{
323 struct i2c_client *client = to_i2c_client(dev);
324 unsigned char buf[4];
325 int err;
326
327 err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
328 if (err)
329 return err;
330
331 dev_dbg(&client->dev,
332 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
333 __func__, buf[0], buf[1], buf[2], buf[3]);
334
335 tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
Jan Kardellc7aef4f2014-12-10 15:53:37 -0800336 tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
337 tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700338 tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
339 tm->time.tm_mon = -1;
340 tm->time.tm_year = -1;
341 tm->time.tm_yday = -1;
342 tm->time.tm_isdst = -1;
343
344 err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
345 if (err < 0)
346 return err;
347
348 dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
349 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
350 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
351 tm->enabled, tm->pending);
352
353 return 0;
354}
355
356static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
357{
358 struct i2c_client *client = to_i2c_client(dev);
359 unsigned char buf[4];
360 int err;
Jan Kardell599cda52014-12-10 15:53:40 -0800361
362 /* The alarm has no seconds, round up to nearest minute */
363 if (tm->time.tm_sec) {
Xunlei Pang626fea02015-06-12 10:04:09 +0800364 time64_t alarm_time = rtc_tm_to_time64(&tm->time);
365
366 alarm_time += 60 - tm->time.tm_sec;
367 rtc_time64_to_tm(alarm_time, &tm->time);
Jan Kardell599cda52014-12-10 15:53:40 -0800368 }
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700369
370 dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
371 "enabled=%d pending=%d\n", __func__,
372 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
373 tm->time.tm_mday, tm->enabled, tm->pending);
374
375 buf[0] = bin2bcd(tm->time.tm_min);
376 buf[1] = bin2bcd(tm->time.tm_hour);
377 buf[2] = bin2bcd(tm->time.tm_mday);
378 buf[3] = tm->time.tm_wday & 0x07;
379
380 err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
381 if (err)
382 return err;
383
384 return pcf8563_set_alarm_mode(client, 1);
385}
386
387static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
388{
Jan Kardella45d5282014-12-10 15:53:46 -0800389 dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700390 return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
391}
392
David Brownellff8371a2006-09-30 23:28:17 -0700393static const struct rtc_class_ops pcf8563_rtc_ops = {
Alexander Stein0f20b762012-05-29 15:07:36 -0700394 .ioctl = pcf8563_rtc_ioctl,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800395 .read_time = pcf8563_rtc_read_time,
396 .set_time = pcf8563_rtc_set_time,
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700397 .read_alarm = pcf8563_rtc_read_alarm,
398 .set_alarm = pcf8563_rtc_set_alarm,
399 .alarm_irq_enable = pcf8563_irq_enable,
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800400};
401
Jean Delvared2653e92008-04-29 23:11:39 +0200402static int pcf8563_probe(struct i2c_client *client,
403 const struct i2c_device_id *id)
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800404{
Atsushi Nemotocbb94502007-02-08 14:20:24 -0800405 struct pcf8563 *pcf8563;
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700406 int err;
Jan Kardellff0bc502014-12-10 15:53:43 -0800407 unsigned char buf;
Jan Kardella45d5282014-12-10 15:53:46 -0800408 unsigned char alm_pending;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800409
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700410 dev_dbg(&client->dev, "%s\n", __func__);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800411
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700412 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
413 return -ENODEV;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800414
Jingoo Hand6fbdc32013-04-29 16:20:49 -0700415 pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
416 GFP_KERNEL);
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700417 if (!pcf8563)
418 return -ENOMEM;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800419
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800420 dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
421
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800422 i2c_set_clientdata(client, pcf8563);
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700423 pcf8563->client = client;
424 device_set_wakeup_capable(&client->dev, 1);
Alessandro Zummob74d2ca2009-12-15 16:45:53 -0800425
Jan Kardellff0bc502014-12-10 15:53:43 -0800426 /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
427 buf = PCF8563_TMRC_1_60;
428 err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
429 if (err < 0) {
430 dev_err(&client->dev, "%s: write error\n", __func__);
431 return err;
432 }
433
Jan Kardella45d5282014-12-10 15:53:46 -0800434 err = pcf8563_get_alarm_mode(client, NULL, &alm_pending);
Arnd Bergmanncd1420d2015-05-12 23:27:02 +0200435 if (err) {
Jan Kardella45d5282014-12-10 15:53:46 -0800436 dev_err(&client->dev, "%s: read error\n", __func__);
437 return err;
438 }
439 if (alm_pending)
440 pcf8563_set_alarm_mode(client, 0);
441
Jingoo Hand6fbdc32013-04-29 16:20:49 -0700442 pcf8563->rtc = devm_rtc_device_register(&client->dev,
443 pcf8563_driver.driver.name,
444 &pcf8563_rtc_ops, THIS_MODULE);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800445
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700446 if (IS_ERR(pcf8563->rtc))
447 return PTR_ERR(pcf8563->rtc);
448
449 if (client->irq > 0) {
450 err = devm_request_threaded_irq(&client->dev, client->irq,
451 NULL, pcf8563_irq,
452 IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
453 pcf8563->rtc->name, client);
454 if (err) {
455 dev_err(&client->dev, "unable to request IRQ %d\n",
456 client->irq);
457 return err;
458 }
459
460 }
461
Jan Kardell599cda52014-12-10 15:53:40 -0800462 /* the pcf8563 alarm only supports a minute accuracy */
463 pcf8563->rtc->uie_unsupported = 1;
464
Vincent Donnefortede3e9d2014-08-08 14:20:18 -0700465 return 0;
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800466}
467
Jean Delvare3760f732008-04-29 23:11:40 +0200468static const struct i2c_device_id pcf8563_id[] = {
469 { "pcf8563", 0 },
Jon Smirl8ea92122008-07-12 13:47:56 -0700470 { "rtc8564", 0 },
Jean Delvare3760f732008-04-29 23:11:40 +0200471 { }
472};
473MODULE_DEVICE_TABLE(i2c, pcf8563_id);
474
Nick Bowler8dccaf02012-07-30 14:41:59 -0700475#ifdef CONFIG_OF
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800476static const struct of_device_id pcf8563_of_match[] = {
Nick Bowler8dccaf02012-07-30 14:41:59 -0700477 { .compatible = "nxp,pcf8563" },
478 {}
479};
480MODULE_DEVICE_TABLE(of, pcf8563_of_match);
481#endif
482
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700483static struct i2c_driver pcf8563_driver = {
484 .driver = {
485 .name = "rtc-pcf8563",
Nick Bowler0a25bf42012-07-30 14:41:57 -0700486 .owner = THIS_MODULE,
Nick Bowler8dccaf02012-07-30 14:41:59 -0700487 .of_match_table = of_match_ptr(pcf8563_of_match),
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700488 },
489 .probe = pcf8563_probe,
Jean Delvare3760f732008-04-29 23:11:40 +0200490 .id_table = pcf8563_id,
Alessandro Zummoe5fc9cc2008-04-28 02:11:54 -0700491};
492
Axel Lin0abc9202012-03-23 15:02:31 -0700493module_i2c_driver(pcf8563_driver);
Alessandro Zummob5a82d62006-03-27 01:16:44 -0800494
495MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
496MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
497MODULE_LICENSE("GPL");
498MODULE_VERSION(DRV_VERSION);