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Linux/drivers/rtc/rtc-pcf8563.c

  1 /*
  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/clk-provider.h>
 18 #include <linux/i2c.h>
 19 #include <linux/bcd.h>
 20 #include <linux/rtc.h>
 21 #include <linux/slab.h>
 22 #include <linux/module.h>
 23 #include <linux/of.h>
 24 #include <linux/err.h>
 25 
 26 #define DRV_VERSION "0.4.4"
 27 
 28 #define PCF8563_REG_ST1         0x00 /* status */
 29 #define PCF8563_REG_ST2         0x01
 30 #define PCF8563_BIT_AIE         (1 << 1)
 31 #define PCF8563_BIT_AF          (1 << 3)
 32 #define PCF8563_BITS_ST2_N      (7 << 5)
 33 
 34 #define PCF8563_REG_SC          0x02 /* datetime */
 35 #define PCF8563_REG_MN          0x03
 36 #define PCF8563_REG_HR          0x04
 37 #define PCF8563_REG_DM          0x05
 38 #define PCF8563_REG_DW          0x06
 39 #define PCF8563_REG_MO          0x07
 40 #define PCF8563_REG_YR          0x08
 41 
 42 #define PCF8563_REG_AMN         0x09 /* alarm */
 43 
 44 #define PCF8563_REG_CLKO                0x0D /* clock out */
 45 #define PCF8563_REG_CLKO_FE             0x80 /* clock out enabled */
 46 #define PCF8563_REG_CLKO_F_MASK         0x03 /* frequenc mask */
 47 #define PCF8563_REG_CLKO_F_32768HZ      0x00
 48 #define PCF8563_REG_CLKO_F_1024HZ       0x01
 49 #define PCF8563_REG_CLKO_F_32HZ         0x02
 50 #define PCF8563_REG_CLKO_F_1HZ          0x03
 51 
 52 #define PCF8563_REG_TMRC        0x0E /* timer control */
 53 #define PCF8563_TMRC_ENABLE     BIT(7)
 54 #define PCF8563_TMRC_4096       0
 55 #define PCF8563_TMRC_64         1
 56 #define PCF8563_TMRC_1          2
 57 #define PCF8563_TMRC_1_60       3
 58 #define PCF8563_TMRC_MASK       3
 59 
 60 #define PCF8563_REG_TMR         0x0F /* timer */
 61 
 62 #define PCF8563_SC_LV           0x80 /* low voltage */
 63 #define PCF8563_MO_C            0x80 /* century */
 64 
 65 static struct i2c_driver pcf8563_driver;
 66 
 67 struct pcf8563 {
 68         struct rtc_device *rtc;
 69         /*
 70          * The meaning of MO_C bit varies by the chip type.
 71          * From PCF8563 datasheet: this bit is toggled when the years
 72          * register overflows from 99 to 00
 73          *   0 indicates the century is 20xx
 74          *   1 indicates the century is 19xx
 75          * From RTC8564 datasheet: this bit indicates change of
 76          * century. When the year digit data overflows from 99 to 00,
 77          * this bit is set. By presetting it to 0 while still in the
 78          * 20th century, it will be set in year 2000, ...
 79          * There seems no reliable way to know how the system use this
 80          * bit.  So let's do it heuristically, assuming we are live in
 81          * 1970...2069.
 82          */
 83         int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
 84         int voltage_low; /* incicates if a low_voltage was detected */
 85 
 86         struct i2c_client *client;
 87 #ifdef CONFIG_COMMON_CLK
 88         struct clk_hw           clkout_hw;
 89 #endif
 90 };
 91 
 92 static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
 93                                    unsigned char length, unsigned char *buf)
 94 {
 95         struct i2c_msg msgs[] = {
 96                 {/* setup read ptr */
 97                         .addr = client->addr,
 98                         .len = 1,
 99                         .buf = &reg,
100                 },
101                 {
102                         .addr = client->addr,
103                         .flags = I2C_M_RD,
104                         .len = length,
105                         .buf = buf
106                 },
107         };
108 
109         if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
110                 dev_err(&client->dev, "%s: read error\n", __func__);
111                 return -EIO;
112         }
113 
114         return 0;
115 }
116 
117 static int pcf8563_write_block_data(struct i2c_client *client,
118                                    unsigned char reg, unsigned char length,
119                                    unsigned char *buf)
120 {
121         int i, err;
122 
123         for (i = 0; i < length; i++) {
124                 unsigned char data[2] = { reg + i, buf[i] };
125 
126                 err = i2c_master_send(client, data, sizeof(data));
127                 if (err != sizeof(data)) {
128                         dev_err(&client->dev,
129                                 "%s: err=%d addr=%02x, data=%02x\n",
130                                 __func__, err, data[0], data[1]);
131                         return -EIO;
132                 }
133         }
134 
135         return 0;
136 }
137 
138 static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
139 {
140         unsigned char buf;
141         int err;
142 
143         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
144         if (err < 0)
145                 return err;
146 
147         if (on)
148                 buf |= PCF8563_BIT_AIE;
149         else
150                 buf &= ~PCF8563_BIT_AIE;
151 
152         buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N);
153 
154         err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf);
155         if (err < 0) {
156                 dev_err(&client->dev, "%s: write error\n", __func__);
157                 return -EIO;
158         }
159 
160         return 0;
161 }
162 
163 static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
164                                   unsigned char *pen)
165 {
166         unsigned char buf;
167         int err;
168 
169         err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
170         if (err)
171                 return err;
172 
173         if (en)
174                 *en = !!(buf & PCF8563_BIT_AIE);
175         if (pen)
176                 *pen = !!(buf & PCF8563_BIT_AF);
177 
178         return 0;
179 }
180 
181 static irqreturn_t pcf8563_irq(int irq, void *dev_id)
182 {
183         struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
184         int err;
185         char pending;
186 
187         err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
188         if (err)
189                 return IRQ_NONE;
190 
191         if (pending) {
192                 rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
193                 pcf8563_set_alarm_mode(pcf8563->client, 1);
194                 return IRQ_HANDLED;
195         }
196 
197         return IRQ_NONE;
198 }
199 
200 /*
201  * In the routines that deal directly with the pcf8563 hardware, we use
202  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
203  */
204 static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
205 {
206         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
207         unsigned char buf[9];
208         int err;
209 
210         err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
211         if (err)
212                 return err;
213 
214         if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
215                 pcf8563->voltage_low = 1;
216                 dev_err(&client->dev,
217                         "low voltage detected, date/time is not reliable.\n");
218                 return -EINVAL;
219         }
220 
221         dev_dbg(&client->dev,
222                 "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
223                 "mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
224                 __func__,
225                 buf[0], buf[1], buf[2], buf[3],
226                 buf[4], buf[5], buf[6], buf[7],
227                 buf[8]);
228 
229 
230         tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
231         tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
232         tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
233         tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
234         tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
235         tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
236         tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
237         if (tm->tm_year < 70)
238                 tm->tm_year += 100;     /* assume we are in 1970...2069 */
239         /* detect the polarity heuristically. see note above. */
240         pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
241                 (tm->tm_year >= 100) : (tm->tm_year < 100);
242 
243         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
244                 "mday=%d, mon=%d, year=%d, wday=%d\n",
245                 __func__,
246                 tm->tm_sec, tm->tm_min, tm->tm_hour,
247                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
248 
249         return 0;
250 }
251 
252 static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
253 {
254         struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
255         unsigned char buf[9];
256 
257         dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
258                 "mday=%d, mon=%d, year=%d, wday=%d\n",
259                 __func__,
260                 tm->tm_sec, tm->tm_min, tm->tm_hour,
261                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
262 
263         /* hours, minutes and seconds */
264         buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
265         buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
266         buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
267 
268         buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
269 
270         /* month, 1 - 12 */
271         buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
272 
273         /* year and century */
274         buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
275         if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
276                 buf[PCF8563_REG_MO] |= PCF8563_MO_C;
277 
278         buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
279 
280         return pcf8563_write_block_data(client, PCF8563_REG_SC,
281                                 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
282 }
283 
284 #ifdef CONFIG_RTC_INTF_DEV
285 static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
286 {
287         struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
288         struct rtc_time tm;
289 
290         switch (cmd) {
291         case RTC_VL_READ:
292                 if (pcf8563->voltage_low)
293                         dev_info(dev, "low voltage detected, date/time is not reliable.\n");
294 
295                 if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
296                                         sizeof(int)))
297                         return -EFAULT;
298                 return 0;
299         case RTC_VL_CLR:
300                 /*
301                  * Clear the VL bit in the seconds register in case
302                  * the time has not been set already (which would
303                  * have cleared it). This does not really matter
304                  * because of the cached voltage_low value but do it
305                  * anyway for consistency.
306                  */
307                 if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
308                         pcf8563_set_datetime(to_i2c_client(dev), &tm);
309 
310                 /* Clear the cached value. */
311                 pcf8563->voltage_low = 0;
312 
313                 return 0;
314         default:
315                 return -ENOIOCTLCMD;
316         }
317 }
318 #else
319 #define pcf8563_rtc_ioctl NULL
320 #endif
321 
322 static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
323 {
324         return pcf8563_get_datetime(to_i2c_client(dev), tm);
325 }
326 
327 static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
328 {
329         return pcf8563_set_datetime(to_i2c_client(dev), tm);
330 }
331 
332 static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
333 {
334         struct i2c_client *client = to_i2c_client(dev);
335         unsigned char buf[4];
336         int err;
337 
338         err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
339         if (err)
340                 return err;
341 
342         dev_dbg(&client->dev,
343                 "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
344                 __func__, buf[0], buf[1], buf[2], buf[3]);
345 
346         tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
347         tm->time.tm_hour = bcd2bin(buf[1] & 0x3F);
348         tm->time.tm_mday = bcd2bin(buf[2] & 0x3F);
349         tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
350         tm->time.tm_mon = -1;
351         tm->time.tm_year = -1;
352         tm->time.tm_yday = -1;
353         tm->time.tm_isdst = -1;
354 
355         err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
356         if (err < 0)
357                 return err;
358 
359         dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
360                 " enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
361                 tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
362                 tm->enabled, tm->pending);
363 
364         return 0;
365 }
366 
367 static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
368 {
369         struct i2c_client *client = to_i2c_client(dev);
370         unsigned char buf[4];
371         int err;
372 
373         /* The alarm has no seconds, round up to nearest minute */
374         if (tm->time.tm_sec) {
375                 time64_t alarm_time = rtc_tm_to_time64(&tm->time);
376 
377                 alarm_time += 60 - tm->time.tm_sec;
378                 rtc_time64_to_tm(alarm_time, &tm->time);
379         }
380 
381         dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
382                 "enabled=%d pending=%d\n", __func__,
383                 tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
384                 tm->time.tm_mday, tm->enabled, tm->pending);
385 
386         buf[0] = bin2bcd(tm->time.tm_min);
387         buf[1] = bin2bcd(tm->time.tm_hour);
388         buf[2] = bin2bcd(tm->time.tm_mday);
389         buf[3] = tm->time.tm_wday & 0x07;
390 
391         err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
392         if (err)
393                 return err;
394 
395         return pcf8563_set_alarm_mode(client, 1);
396 }
397 
398 static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
399 {
400         dev_dbg(dev, "%s: en=%d\n", __func__, enabled);
401         return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
402 }
403 
404 #ifdef CONFIG_COMMON_CLK
405 /*
406  * Handling of the clkout
407  */
408 
409 #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw)
410 
411 static int clkout_rates[] = {
412         32768,
413         1024,
414         32,
415         1,
416 };
417 
418 static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw,
419                                                 unsigned long parent_rate)
420 {
421         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
422         struct i2c_client *client = pcf8563->client;
423         unsigned char buf;
424         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
425 
426         if (ret < 0)
427                 return 0;
428 
429         buf &= PCF8563_REG_CLKO_F_MASK;
430         return clkout_rates[ret];
431 }
432 
433 static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
434                                       unsigned long *prate)
435 {
436         int i;
437 
438         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
439                 if (clkout_rates[i] <= rate)
440                         return clkout_rates[i];
441 
442         return 0;
443 }
444 
445 static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
446                                    unsigned long parent_rate)
447 {
448         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
449         struct i2c_client *client = pcf8563->client;
450         unsigned char buf;
451         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
452         int i;
453 
454         if (ret < 0)
455                 return ret;
456 
457         for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
458                 if (clkout_rates[i] == rate) {
459                         buf &= ~PCF8563_REG_CLKO_F_MASK;
460                         buf |= i;
461                         ret = pcf8563_write_block_data(client,
462                                                        PCF8563_REG_CLKO, 1,
463                                                        &buf);
464                         return ret;
465                 }
466 
467         return -EINVAL;
468 }
469 
470 static int pcf8563_clkout_control(struct clk_hw *hw, bool enable)
471 {
472         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
473         struct i2c_client *client = pcf8563->client;
474         unsigned char buf;
475         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
476 
477         if (ret < 0)
478                 return ret;
479 
480         if (enable)
481                 buf |= PCF8563_REG_CLKO_FE;
482         else
483                 buf &= ~PCF8563_REG_CLKO_FE;
484 
485         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
486         return ret;
487 }
488 
489 static int pcf8563_clkout_prepare(struct clk_hw *hw)
490 {
491         return pcf8563_clkout_control(hw, 1);
492 }
493 
494 static void pcf8563_clkout_unprepare(struct clk_hw *hw)
495 {
496         pcf8563_clkout_control(hw, 0);
497 }
498 
499 static int pcf8563_clkout_is_prepared(struct clk_hw *hw)
500 {
501         struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw);
502         struct i2c_client *client = pcf8563->client;
503         unsigned char buf;
504         int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf);
505 
506         if (ret < 0)
507                 return ret;
508 
509         return !!(buf & PCF8563_REG_CLKO_FE);
510 }
511 
512 static const struct clk_ops pcf8563_clkout_ops = {
513         .prepare = pcf8563_clkout_prepare,
514         .unprepare = pcf8563_clkout_unprepare,
515         .is_prepared = pcf8563_clkout_is_prepared,
516         .recalc_rate = pcf8563_clkout_recalc_rate,
517         .round_rate = pcf8563_clkout_round_rate,
518         .set_rate = pcf8563_clkout_set_rate,
519 };
520 
521 static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563)
522 {
523         struct i2c_client *client = pcf8563->client;
524         struct device_node *node = client->dev.of_node;
525         struct clk *clk;
526         struct clk_init_data init;
527         int ret;
528         unsigned char buf;
529 
530         /* disable the clkout output */
531         buf = 0;
532         ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf);
533         if (ret < 0)
534                 return ERR_PTR(ret);
535 
536         init.name = "pcf8563-clkout";
537         init.ops = &pcf8563_clkout_ops;
538         init.flags = CLK_IS_ROOT;
539         init.parent_names = NULL;
540         init.num_parents = 0;
541         pcf8563->clkout_hw.init = &init;
542 
543         /* optional override of the clockname */
544         of_property_read_string(node, "clock-output-names", &init.name);
545 
546         /* register the clock */
547         clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw);
548 
549         if (!IS_ERR(clk))
550                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
551 
552         return clk;
553 }
554 #endif
555 
556 static const struct rtc_class_ops pcf8563_rtc_ops = {
557         .ioctl          = pcf8563_rtc_ioctl,
558         .read_time      = pcf8563_rtc_read_time,
559         .set_time       = pcf8563_rtc_set_time,
560         .read_alarm     = pcf8563_rtc_read_alarm,
561         .set_alarm      = pcf8563_rtc_set_alarm,
562         .alarm_irq_enable = pcf8563_irq_enable,
563 };
564 
565 static int pcf8563_probe(struct i2c_client *client,
566                                 const struct i2c_device_id *id)
567 {
568         struct pcf8563 *pcf8563;
569         int err;
570         unsigned char buf;
571         unsigned char alm_pending;
572 
573         dev_dbg(&client->dev, "%s\n", __func__);
574 
575         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
576                 return -ENODEV;
577 
578         pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
579                                 GFP_KERNEL);
580         if (!pcf8563)
581                 return -ENOMEM;
582 
583         dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
584 
585         i2c_set_clientdata(client, pcf8563);
586         pcf8563->client = client;
587         device_set_wakeup_capable(&client->dev, 1);
588 
589         /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
590         buf = PCF8563_TMRC_1_60;
591         err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
592         if (err < 0) {
593                 dev_err(&client->dev, "%s: write error\n", __func__);
594                 return err;
595         }
596 
597         err = pcf8563_get_alarm_mode(client, NULL, &alm_pending);
598         if (err) {
599                 dev_err(&client->dev, "%s: read error\n", __func__);
600                 return err;
601         }
602         if (alm_pending)
603                 pcf8563_set_alarm_mode(client, 0);
604 
605         pcf8563->rtc = devm_rtc_device_register(&client->dev,
606                                 pcf8563_driver.driver.name,
607                                 &pcf8563_rtc_ops, THIS_MODULE);
608 
609         if (IS_ERR(pcf8563->rtc))
610                 return PTR_ERR(pcf8563->rtc);
611 
612         if (client->irq > 0) {
613                 err = devm_request_threaded_irq(&client->dev, client->irq,
614                                 NULL, pcf8563_irq,
615                                 IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
616                                 pcf8563->rtc->name, client);
617                 if (err) {
618                         dev_err(&client->dev, "unable to request IRQ %d\n",
619                                                                 client->irq);
620                         return err;
621                 }
622 
623         }
624 
625 #ifdef CONFIG_COMMON_CLK
626         /* register clk in common clk framework */
627         pcf8563_clkout_register_clk(pcf8563);
628 #endif
629 
630         /* the pcf8563 alarm only supports a minute accuracy */
631         pcf8563->rtc->uie_unsupported = 1;
632 
633         return 0;
634 }
635 
636 static const struct i2c_device_id pcf8563_id[] = {
637         { "pcf8563", 0 },
638         { "rtc8564", 0 },
639         { }
640 };
641 MODULE_DEVICE_TABLE(i2c, pcf8563_id);
642 
643 #ifdef CONFIG_OF
644 static const struct of_device_id pcf8563_of_match[] = {
645         { .compatible = "nxp,pcf8563" },
646         {}
647 };
648 MODULE_DEVICE_TABLE(of, pcf8563_of_match);
649 #endif
650 
651 static struct i2c_driver pcf8563_driver = {
652         .driver         = {
653                 .name   = "rtc-pcf8563",
654                 .of_match_table = of_match_ptr(pcf8563_of_match),
655         },
656         .probe          = pcf8563_probe,
657         .id_table       = pcf8563_id,
658 };
659 
660 module_i2c_driver(pcf8563_driver);
661 
662 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
663 MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
664 MODULE_LICENSE("GPL");
665 MODULE_VERSION(DRV_VERSION);
666 

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