rtc: Add max77660 rtc driver
[linux-3.10.git] / drivers / rtc / rtc-rs5c372.c
1 /*
2  * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs
3  *
4  * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
5  * Copyright (C) 2006 Tower Technologies
6  * Copyright (C) 2008 Paul Mundt
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/i2c.h>
14 #include <linux/rtc.h>
15 #include <linux/bcd.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18
19 #define DRV_VERSION "0.6"
20
21
22 /*
23  * Ricoh has a family of I2C based RTCs, which differ only slightly from
24  * each other.  Differences center on pinout (e.g. how many interrupts,
25  * output clock, etc) and how the control registers are used.  The '372
26  * is significant only because that's the one this driver first supported.
27  */
28 #define RS5C372_REG_SECS        0
29 #define RS5C372_REG_MINS        1
30 #define RS5C372_REG_HOURS       2
31 #define RS5C372_REG_WDAY        3
32 #define RS5C372_REG_DAY         4
33 #define RS5C372_REG_MONTH       5
34 #define RS5C372_REG_YEAR        6
35 #define RS5C372_REG_TRIM        7
36 #       define RS5C372_TRIM_XSL         0x80
37 #       define RS5C372_TRIM_MASK        0x7F
38
39 #define RS5C_REG_ALARM_A_MIN    8                       /* or ALARM_W */
40 #define RS5C_REG_ALARM_A_HOURS  9
41 #define RS5C_REG_ALARM_A_WDAY   10
42
43 #define RS5C_REG_ALARM_B_MIN    11                      /* or ALARM_D */
44 #define RS5C_REG_ALARM_B_HOURS  12
45 #define RS5C_REG_ALARM_B_WDAY   13                      /* (ALARM_B only) */
46
47 #define RS5C_REG_CTRL1          14
48 #       define RS5C_CTRL1_AALE          (1 << 7)        /* or WALE */
49 #       define RS5C_CTRL1_BALE          (1 << 6)        /* or DALE */
50 #       define RV5C387_CTRL1_24         (1 << 5)
51 #       define RS5C372A_CTRL1_SL1       (1 << 5)
52 #       define RS5C_CTRL1_CT_MASK       (7 << 0)
53 #       define RS5C_CTRL1_CT0           (0 << 0)        /* no periodic irq */
54 #       define RS5C_CTRL1_CT4           (4 << 0)        /* 1 Hz level irq */
55 #define RS5C_REG_CTRL2          15
56 #       define RS5C372_CTRL2_24         (1 << 5)
57 #       define R2025_CTRL2_XST          (1 << 5)
58 #       define RS5C_CTRL2_XSTP          (1 << 4)        /* only if !R2025S/D */
59 #       define RS5C_CTRL2_CTFG          (1 << 2)
60 #       define RS5C_CTRL2_AAFG          (1 << 1)        /* or WAFG */
61 #       define RS5C_CTRL2_BAFG          (1 << 0)        /* or DAFG */
62
63
64 /* to read (style 1) or write registers starting at R */
65 #define RS5C_ADDR(R)            (((R) << 4) | 0)
66
67
68 enum rtc_type {
69         rtc_undef = 0,
70         rtc_r2025sd,
71         rtc_r2221tl,
72         rtc_rs5c372a,
73         rtc_rs5c372b,
74         rtc_rv5c386,
75         rtc_rv5c387a,
76 };
77
78 static const struct i2c_device_id rs5c372_id[] = {
79         { "r2025sd", rtc_r2025sd },
80         { "r2221tl", rtc_r2221tl },
81         { "rs5c372a", rtc_rs5c372a },
82         { "rs5c372b", rtc_rs5c372b },
83         { "rv5c386", rtc_rv5c386 },
84         { "rv5c387a", rtc_rv5c387a },
85         { }
86 };
87 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
88
89 /* REVISIT:  this assumes that:
90  *  - we're in the 21st century, so it's safe to ignore the century
91  *    bit for rv5c38[67] (REG_MONTH bit 7);
92  *  - we should use ALARM_A not ALARM_B (may be wrong on some boards)
93  */
94 struct rs5c372 {
95         struct i2c_client       *client;
96         struct rtc_device       *rtc;
97         enum rtc_type           type;
98         unsigned                time24:1;
99         unsigned                has_irq:1;
100         unsigned                smbus:1;
101         char                    buf[17];
102         char                    *regs;
103 };
104
105 static int rs5c_get_regs(struct rs5c372 *rs5c)
106 {
107         struct i2c_client       *client = rs5c->client;
108         struct i2c_msg          msgs[] = {
109                 {
110                         .addr = client->addr,
111                         .flags = I2C_M_RD,
112                         .len = sizeof(rs5c->buf),
113                         .buf = rs5c->buf
114                 },
115         };
116
117         /* This implements the third reading method from the datasheet, using
118          * an internal address that's reset after each transaction (by STOP)
119          * to 0x0f ... so we read extra registers, and skip the first one.
120          *
121          * The first method doesn't work with the iop3xx adapter driver, on at
122          * least 80219 chips; this works around that bug.
123          *
124          * The third method on the other hand doesn't work for the SMBus-only
125          * configurations, so we use the the first method there, stripping off
126          * the extra register in the process.
127          */
128         if (rs5c->smbus) {
129                 int addr = RS5C_ADDR(RS5C372_REG_SECS);
130                 int size = sizeof(rs5c->buf) - 1;
131
132                 if (i2c_smbus_read_i2c_block_data(client, addr, size,
133                                                   rs5c->buf + 1) != size) {
134                         dev_warn(&client->dev, "can't read registers\n");
135                         return -EIO;
136                 }
137         } else {
138                 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
139                         dev_warn(&client->dev, "can't read registers\n");
140                         return -EIO;
141                 }
142         }
143
144         dev_dbg(&client->dev,
145                 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
146                 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
147                 rs5c->regs[0],  rs5c->regs[1],  rs5c->regs[2],  rs5c->regs[3],
148                 rs5c->regs[4],  rs5c->regs[5],  rs5c->regs[6],  rs5c->regs[7],
149                 rs5c->regs[8],  rs5c->regs[9],  rs5c->regs[10], rs5c->regs[11],
150                 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);
151
152         return 0;
153 }
154
155 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
156 {
157         unsigned        hour;
158
159         if (rs5c->time24)
160                 return bcd2bin(reg & 0x3f);
161
162         hour = bcd2bin(reg & 0x1f);
163         if (hour == 12)
164                 hour = 0;
165         if (reg & 0x20)
166                 hour += 12;
167         return hour;
168 }
169
170 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
171 {
172         if (rs5c->time24)
173                 return bin2bcd(hour);
174
175         if (hour > 12)
176                 return 0x20 | bin2bcd(hour - 12);
177         if (hour == 12)
178                 return 0x20 | bin2bcd(12);
179         if (hour == 0)
180                 return bin2bcd(12);
181         return bin2bcd(hour);
182 }
183
184 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
185 {
186         struct rs5c372  *rs5c = i2c_get_clientdata(client);
187         int             status = rs5c_get_regs(rs5c);
188
189         if (status < 0)
190                 return status;
191
192         tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
193         tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
194         tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
195
196         tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
197         tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
198
199         /* tm->tm_mon is zero-based */
200         tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
201
202         /* year is 1900 + tm->tm_year */
203         tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;
204
205         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
206                 "mday=%d, mon=%d, year=%d, wday=%d\n",
207                 __func__,
208                 tm->tm_sec, tm->tm_min, tm->tm_hour,
209                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
210
211         /* rtc might need initialization */
212         return rtc_valid_tm(tm);
213 }
214
215 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
216 {
217         struct rs5c372  *rs5c = i2c_get_clientdata(client);
218         unsigned char   buf[7];
219         int             addr;
220
221         dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
222                 "mday=%d, mon=%d, year=%d, wday=%d\n",
223                 __func__,
224                 tm->tm_sec, tm->tm_min, tm->tm_hour,
225                 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
226
227         addr   = RS5C_ADDR(RS5C372_REG_SECS);
228         buf[0] = bin2bcd(tm->tm_sec);
229         buf[1] = bin2bcd(tm->tm_min);
230         buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
231         buf[3] = bin2bcd(tm->tm_wday);
232         buf[4] = bin2bcd(tm->tm_mday);
233         buf[5] = bin2bcd(tm->tm_mon + 1);
234         buf[6] = bin2bcd(tm->tm_year - 100);
235
236         if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
237                 dev_err(&client->dev, "%s: write error\n", __func__);
238                 return -EIO;
239         }
240
241         return 0;
242 }
243
244 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
245 #define NEED_TRIM
246 #endif
247
248 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
249 #define NEED_TRIM
250 #endif
251
252 #ifdef  NEED_TRIM
253 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
254 {
255         struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
256         u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
257
258         if (osc)
259                 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
260
261         if (trim) {
262                 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
263                 tmp &= RS5C372_TRIM_MASK;
264                 if (tmp & 0x3e) {
265                         int t = tmp & 0x3f;
266
267                         if (tmp & 0x40)
268                                 t = (~t | (s8)0xc0) + 1;
269                         else
270                                 t = t - 1;
271
272                         tmp = t * 2;
273                 } else
274                         tmp = 0;
275                 *trim = tmp;
276         }
277
278         return 0;
279 }
280 #endif
281
282 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
283 {
284         return rs5c372_get_datetime(to_i2c_client(dev), tm);
285 }
286
287 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
288 {
289         return rs5c372_set_datetime(to_i2c_client(dev), tm);
290 }
291
292
293 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
294 {
295         struct i2c_client       *client = to_i2c_client(dev);
296         struct rs5c372          *rs5c = i2c_get_clientdata(client);
297         unsigned char           buf;
298         int                     status, addr;
299
300         buf = rs5c->regs[RS5C_REG_CTRL1];
301
302         if (!rs5c->has_irq)
303                 return -EINVAL;
304
305         status = rs5c_get_regs(rs5c);
306         if (status < 0)
307                 return status;
308
309         addr = RS5C_ADDR(RS5C_REG_CTRL1);
310         if (enabled)
311                 buf |= RS5C_CTRL1_AALE;
312         else
313                 buf &= ~RS5C_CTRL1_AALE;
314
315         if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
316                 dev_warn(dev, "can't update alarm\n");
317                 status = -EIO;
318         } else
319                 rs5c->regs[RS5C_REG_CTRL1] = buf;
320
321         return status;
322 }
323
324
325 /* NOTE:  Since RTC_WKALM_{RD,SET} were originally defined for EFI,
326  * which only exposes a polled programming interface; and since
327  * these calls map directly to those EFI requests; we don't demand
328  * we have an IRQ for this chip when we go through this API.
329  *
330  * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
331  * though, managed through RTC_AIE_{ON,OFF} requests.
332  */
333
334 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
335 {
336         struct i2c_client       *client = to_i2c_client(dev);
337         struct rs5c372          *rs5c = i2c_get_clientdata(client);
338         int                     status;
339
340         status = rs5c_get_regs(rs5c);
341         if (status < 0)
342                 return status;
343
344         /* report alarm time */
345         t->time.tm_sec = 0;
346         t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
347         t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
348         t->time.tm_mday = -1;
349         t->time.tm_mon = -1;
350         t->time.tm_year = -1;
351         t->time.tm_wday = -1;
352         t->time.tm_yday = -1;
353         t->time.tm_isdst = -1;
354
355         /* ... and status */
356         t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
357         t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
358
359         return 0;
360 }
361
362 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
363 {
364         struct i2c_client       *client = to_i2c_client(dev);
365         struct rs5c372          *rs5c = i2c_get_clientdata(client);
366         int                     status, addr, i;
367         unsigned char           buf[3];
368
369         /* only handle up to 24 hours in the future, like RTC_ALM_SET */
370         if (t->time.tm_mday != -1
371                         || t->time.tm_mon != -1
372                         || t->time.tm_year != -1)
373                 return -EINVAL;
374
375         /* REVISIT: round up tm_sec */
376
377         /* if needed, disable irq (clears pending status) */
378         status = rs5c_get_regs(rs5c);
379         if (status < 0)
380                 return status;
381         if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
382                 addr = RS5C_ADDR(RS5C_REG_CTRL1);
383                 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
384                 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
385                         dev_dbg(dev, "can't disable alarm\n");
386                         return -EIO;
387                 }
388                 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
389         }
390
391         /* set alarm */
392         buf[0] = bin2bcd(t->time.tm_min);
393         buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
394         buf[2] = 0x7f;  /* any/all days */
395
396         for (i = 0; i < sizeof(buf); i++) {
397                 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
398                 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
399                         dev_dbg(dev, "can't set alarm time\n");
400                         return -EIO;
401                 }
402         }
403
404         /* ... and maybe enable its irq */
405         if (t->enabled) {
406                 addr = RS5C_ADDR(RS5C_REG_CTRL1);
407                 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
408                 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
409                         dev_warn(dev, "can't enable alarm\n");
410                 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
411         }
412
413         return 0;
414 }
415
416 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
417
418 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
419 {
420         int err, osc, trim;
421
422         err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
423         if (err == 0) {
424                 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
425                                 osc / 1000, osc % 1000);
426                 seq_printf(seq, "trim\t\t: %d\n", trim);
427         }
428
429         return 0;
430 }
431
432 #else
433 #define rs5c372_rtc_proc        NULL
434 #endif
435
436 static const struct rtc_class_ops rs5c372_rtc_ops = {
437         .proc           = rs5c372_rtc_proc,
438         .read_time      = rs5c372_rtc_read_time,
439         .set_time       = rs5c372_rtc_set_time,
440         .read_alarm     = rs5c_read_alarm,
441         .set_alarm      = rs5c_set_alarm,
442         .alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
443 };
444
445 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
446
447 static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
448                                 struct device_attribute *attr, char *buf)
449 {
450         int err, trim;
451
452         err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
453         if (err)
454                 return err;
455
456         return sprintf(buf, "%d\n", trim);
457 }
458 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
459
460 static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
461                                 struct device_attribute *attr, char *buf)
462 {
463         int err, osc;
464
465         err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
466         if (err)
467                 return err;
468
469         return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
470 }
471 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
472
473 static int rs5c_sysfs_register(struct device *dev)
474 {
475         int err;
476
477         err = device_create_file(dev, &dev_attr_trim);
478         if (err)
479                 return err;
480         err = device_create_file(dev, &dev_attr_osc);
481         if (err)
482                 device_remove_file(dev, &dev_attr_trim);
483
484         return err;
485 }
486
487 static void rs5c_sysfs_unregister(struct device *dev)
488 {
489         device_remove_file(dev, &dev_attr_trim);
490         device_remove_file(dev, &dev_attr_osc);
491 }
492
493 #else
494 static int rs5c_sysfs_register(struct device *dev)
495 {
496         return 0;
497 }
498
499 static void rs5c_sysfs_unregister(struct device *dev)
500 {
501         /* nothing */
502 }
503 #endif  /* SYSFS */
504
505 static struct i2c_driver rs5c372_driver;
506
507 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
508 {
509         unsigned char buf[2];
510         int addr, i, ret = 0;
511
512         if (rs5c372->type == rtc_r2025sd) {
513                 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
514                         return ret;
515                 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
516         } else {
517                 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
518                         return ret;
519                 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
520         }
521
522         addr   = RS5C_ADDR(RS5C_REG_CTRL1);
523         buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
524         buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
525
526         /* use 24hr mode */
527         switch (rs5c372->type) {
528         case rtc_rs5c372a:
529         case rtc_rs5c372b:
530                 buf[1] |= RS5C372_CTRL2_24;
531                 rs5c372->time24 = 1;
532                 break;
533         case rtc_r2025sd:
534         case rtc_r2221tl:
535         case rtc_rv5c386:
536         case rtc_rv5c387a:
537                 buf[0] |= RV5C387_CTRL1_24;
538                 rs5c372->time24 = 1;
539                 break;
540         default:
541                 /* impossible */
542                 break;
543         }
544
545         for (i = 0; i < sizeof(buf); i++) {
546                 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
547                 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
548                 if (unlikely(ret < 0))
549                         return ret;
550         }
551
552         rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
553         rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
554
555         return 0;
556 }
557
558 static int rs5c372_probe(struct i2c_client *client,
559                          const struct i2c_device_id *id)
560 {
561         int err = 0;
562         int smbus_mode = 0;
563         struct rs5c372 *rs5c372;
564         struct rtc_time tm;
565
566         dev_dbg(&client->dev, "%s\n", __func__);
567
568         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
569                         I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
570                 /*
571                  * If we don't have any master mode adapter, try breaking
572                  * it down in to the barest of capabilities.
573                  */
574                 if (i2c_check_functionality(client->adapter,
575                                 I2C_FUNC_SMBUS_BYTE_DATA |
576                                 I2C_FUNC_SMBUS_I2C_BLOCK))
577                         smbus_mode = 1;
578                 else {
579                         /* Still no good, give up */
580                         err = -ENODEV;
581                         goto exit;
582                 }
583         }
584
585         rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372),
586                                 GFP_KERNEL);
587         if (!rs5c372) {
588                 err = -ENOMEM;
589                 goto exit;
590         }
591
592         rs5c372->client = client;
593         i2c_set_clientdata(client, rs5c372);
594         rs5c372->type = id->driver_data;
595
596         /* we read registers 0x0f then 0x00-0x0f; skip the first one */
597         rs5c372->regs = &rs5c372->buf[1];
598         rs5c372->smbus = smbus_mode;
599
600         err = rs5c_get_regs(rs5c372);
601         if (err < 0)
602                 goto exit;
603
604         /* clock may be set for am/pm or 24 hr time */
605         switch (rs5c372->type) {
606         case rtc_rs5c372a:
607         case rtc_rs5c372b:
608                 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
609                  * so does periodic irq, except some 327a modes.
610                  */
611                 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
612                         rs5c372->time24 = 1;
613                 break;
614         case rtc_r2025sd:
615         case rtc_r2221tl:
616         case rtc_rv5c386:
617         case rtc_rv5c387a:
618                 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
619                         rs5c372->time24 = 1;
620                 /* alarm uses ALARM_W; and nINTRB for alarm and periodic
621                  * irq, on both 386 and 387
622                  */
623                 break;
624         default:
625                 dev_err(&client->dev, "unknown RTC type\n");
626                 goto exit;
627         }
628
629         /* if the oscillator lost power and no other software (like
630          * the bootloader) set it up, do it here.
631          *
632          * The R2025S/D does this a little differently than the other
633          * parts, so we special case that..
634          */
635         err = rs5c_oscillator_setup(rs5c372);
636         if (unlikely(err < 0)) {
637                 dev_err(&client->dev, "setup error\n");
638                 goto exit;
639         }
640
641         if (rs5c372_get_datetime(client, &tm) < 0)
642                 dev_warn(&client->dev, "clock needs to be set\n");
643
644         dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
645                         ({ char *s; switch (rs5c372->type) {
646                         case rtc_r2025sd:       s = "r2025sd"; break;
647                         case rtc_r2221tl:       s = "r2221tl"; break;
648                         case rtc_rs5c372a:      s = "rs5c372a"; break;
649                         case rtc_rs5c372b:      s = "rs5c372b"; break;
650                         case rtc_rv5c386:       s = "rv5c386"; break;
651                         case rtc_rv5c387a:      s = "rv5c387a"; break;
652                         default:                s = "chip"; break;
653                         }; s;}),
654                         rs5c372->time24 ? "24hr" : "am/pm"
655                         );
656
657         /* REVISIT use client->irq to register alarm irq ... */
658         rs5c372->rtc = devm_rtc_device_register(&client->dev,
659                                         rs5c372_driver.driver.name,
660                                         &rs5c372_rtc_ops, THIS_MODULE);
661
662         if (IS_ERR(rs5c372->rtc)) {
663                 err = PTR_ERR(rs5c372->rtc);
664                 goto exit;
665         }
666
667         err = rs5c_sysfs_register(&client->dev);
668         if (err)
669                 goto exit;
670
671         return 0;
672
673 exit:
674         return err;
675 }
676
677 static int rs5c372_remove(struct i2c_client *client)
678 {
679         rs5c_sysfs_unregister(&client->dev);
680         return 0;
681 }
682
683 static struct i2c_driver rs5c372_driver = {
684         .driver         = {
685                 .name   = "rtc-rs5c372",
686         },
687         .probe          = rs5c372_probe,
688         .remove         = rs5c372_remove,
689         .id_table       = rs5c372_id,
690 };
691
692 module_i2c_driver(rs5c372_driver);
693
694 MODULE_AUTHOR(
695                 "Pavel Mironchik <pmironchik@optifacio.net>, "
696                 "Alessandro Zummo <a.zummo@towertech.it>, "
697                 "Paul Mundt <lethal@linux-sh.org>");
698 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
699 MODULE_LICENSE("GPL");
700 MODULE_VERSION(DRV_VERSION);