Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us