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Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[linux-2.6.git] / drivers / rtc / rtc-rs5c372.c
blob90cf0a6ff23e3cce363958cb0c3e81cde08c14af
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
18 #define DRV_VERSION "0.6"
19
20
21 /*
22 * Ricoh has a family of I2C based RTCs, which differ only slightly from
23 * each other. Differences center on pinout (e.g. how many interrupts,
24 * output clock, etc) and how the control registers are used. The '372
25 * is significant only because that's the one this driver first supported.
26 */
27 #define RS5C372_REG_SECS 0
28 #define RS5C372_REG_MINS 1
29 #define RS5C372_REG_HOURS 2
30 #define RS5C372_REG_WDAY 3
31 #define RS5C372_REG_DAY 4
32 #define RS5C372_REG_MONTH 5
33 #define RS5C372_REG_YEAR 6
34 #define RS5C372_REG_TRIM 7
35 # define RS5C372_TRIM_XSL 0x80
36 # define RS5C372_TRIM_MASK 0x7F
37
38 #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */
39 #define RS5C_REG_ALARM_A_HOURS 9
40 #define RS5C_REG_ALARM_A_WDAY 10
41
42 #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */
43 #define RS5C_REG_ALARM_B_HOURS 12
44 #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */
45
46 #define RS5C_REG_CTRL1 14
47 # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */
48 # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */
49 # define RV5C387_CTRL1_24 (1 << 5)
50 # define RS5C372A_CTRL1_SL1 (1 << 5)
51 # define RS5C_CTRL1_CT_MASK (7 << 0)
52 # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */
53 # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */
54 #define RS5C_REG_CTRL2 15
55 # define RS5C372_CTRL2_24 (1 << 5)
56 # define R2025_CTRL2_XST (1 << 5)
57 # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */
58 # define RS5C_CTRL2_CTFG (1 << 2)
59 # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */
60 # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */
61
62
63 /* to read (style 1) or write registers starting at R */
64 #define RS5C_ADDR(R) (((R) << 4) | 0)
65
66
67 enum rtc_type {
68 rtc_undef = 0,
69 rtc_r2025sd,
70 rtc_rs5c372a,
71 rtc_rs5c372b,
72 rtc_rv5c386,
73 rtc_rv5c387a,
74 };
75
76 static const struct i2c_device_id rs5c372_id[] = {
77 { "r2025sd", rtc_r2025sd },
78 { "rs5c372a", rtc_rs5c372a },
79 { "rs5c372b", rtc_rs5c372b },
80 { "rv5c386", rtc_rv5c386 },
81 { "rv5c387a", rtc_rv5c387a },
82 { }
83 };
84 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
85
86 /* REVISIT: this assumes that:
87 * - we're in the 21st century, so it's safe to ignore the century
88 * bit for rv5c38[67] (REG_MONTH bit 7);
89 * - we should use ALARM_A not ALARM_B (may be wrong on some boards)
90 */
91 struct rs5c372 {
92 struct i2c_client *client;
93 struct rtc_device *rtc;
94 enum rtc_type type;
95 unsigned time24:1;
96 unsigned has_irq:1;
97 unsigned smbus:1;
98 char buf[17];
99 char *regs;
100 };
101
102 static int rs5c_get_regs(struct rs5c372 *rs5c)
103 {
104 struct i2c_client *client = rs5c->client;
105 struct i2c_msg msgs[] = {
106 { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf },
107 };
108
109 /* This implements the third reading method from the datasheet, using
110 * an internal address that's reset after each transaction (by STOP)
111 * to 0x0f ... so we read extra registers, and skip the first one.
112 *
113 * The first method doesn't work with the iop3xx adapter driver, on at
114 * least 80219 chips; this works around that bug.
115 *
116 * The third method on the other hand doesn't work for the SMBus-only
117 * configurations, so we use the the first method there, stripping off
118 * the extra register in the process.
119 */
120 if (rs5c->smbus) {
121 int addr = RS5C_ADDR(RS5C372_REG_SECS);
122 int size = sizeof(rs5c->buf) - 1;
123
124 if (i2c_smbus_read_i2c_block_data(client, addr, size,
125 rs5c->buf + 1) != size) {
126 dev_warn(&client->dev, "can't read registers\n");
127 return -EIO;
128 }
129 } else {
130 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
131 dev_warn(&client->dev, "can't read registers\n");
132 return -EIO;
133 }
134 }
135
136 dev_dbg(&client->dev,
137 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
138 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
139 rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3],
140 rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7],
141 rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11],
142 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);
143
144 return 0;
145 }
146
147 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
148 {
149 unsigned hour;
150
151 if (rs5c->time24)
152 return bcd2bin(reg & 0x3f);
153
154 hour = bcd2bin(reg & 0x1f);
155 if (hour == 12)
156 hour = 0;
157 if (reg & 0x20)
158 hour += 12;
159 return hour;
160 }
161
162 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
163 {
164 if (rs5c->time24)
165 return bin2bcd(hour);
166
167 if (hour > 12)
168 return 0x20 | bin2bcd(hour - 12);
169 if (hour == 12)
170 return 0x20 | bin2bcd(12);
171 if (hour == 0)
172 return bin2bcd(12);
173 return bin2bcd(hour);
174 }
175
176 static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
177 {
178 struct rs5c372 *rs5c = i2c_get_clientdata(client);
179 int status = rs5c_get_regs(rs5c);
180
181 if (status < 0)
182 return status;
183
184 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
185 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
186 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
187
188 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
189 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
190
191 /* tm->tm_mon is zero-based */
192 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
193
194 /* year is 1900 + tm->tm_year */
195 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;
196
197 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
198 "mday=%d, mon=%d, year=%d, wday=%d\n",
199 __func__,
200 tm->tm_sec, tm->tm_min, tm->tm_hour,
201 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
202
203 /* rtc might need initialization */
204 return rtc_valid_tm(tm);
205 }
206
207 static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
208 {
209 struct rs5c372 *rs5c = i2c_get_clientdata(client);
210 unsigned char buf[8];
211 int addr;
212
213 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
214 "mday=%d, mon=%d, year=%d, wday=%d\n",
215 __func__,
216 tm->tm_sec, tm->tm_min, tm->tm_hour,
217 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
218
219 addr = RS5C_ADDR(RS5C372_REG_SECS);
220 buf[0] = bin2bcd(tm->tm_sec);
221 buf[1] = bin2bcd(tm->tm_min);
222 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
223 buf[3] = bin2bcd(tm->tm_wday);
224 buf[4] = bin2bcd(tm->tm_mday);
225 buf[5] = bin2bcd(tm->tm_mon + 1);
226 buf[6] = bin2bcd(tm->tm_year - 100);
227
228 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
229 dev_err(&client->dev, "%s: write error\n", __func__);
230 return -EIO;
231 }
232
233 return 0;
234 }
235
236 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
237 #define NEED_TRIM
238 #endif
239
240 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
241 #define NEED_TRIM
242 #endif
243
244 #ifdef NEED_TRIM
245 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
246 {
247 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
248 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
249
250 if (osc)
251 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
252
253 if (trim) {
254 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
255 tmp &= RS5C372_TRIM_MASK;
256 if (tmp & 0x3e) {
257 int t = tmp & 0x3f;
258
259 if (tmp & 0x40)
260 t = (~t | (s8)0xc0) + 1;
261 else
262 t = t - 1;
263
264 tmp = t * 2;
265 } else
266 tmp = 0;
267 *trim = tmp;
268 }
269
270 return 0;
271 }
272 #endif
273
274 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
275 {
276 return rs5c372_get_datetime(to_i2c_client(dev), tm);
277 }
278
279 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
280 {
281 return rs5c372_set_datetime(to_i2c_client(dev), tm);
282 }
283
284 #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
285
286 static int
287 rs5c_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
288 {
289 struct i2c_client *client = to_i2c_client(dev);
290 struct rs5c372 *rs5c = i2c_get_clientdata(client);
291 unsigned char buf;
292 int status, addr;
293
294 buf = rs5c->regs[RS5C_REG_CTRL1];
295 switch (cmd) {
296 case RTC_UIE_OFF:
297 case RTC_UIE_ON:
298 /* some 327a modes use a different IRQ pin for 1Hz irqs */
299 if (rs5c->type == rtc_rs5c372a
300 && (buf & RS5C372A_CTRL1_SL1))
301 return -ENOIOCTLCMD;
302 case RTC_AIE_OFF:
303 case RTC_AIE_ON:
304 /* these irq management calls only make sense for chips
305 * which are wired up to an IRQ.
306 */
307 if (!rs5c->has_irq)
308 return -ENOIOCTLCMD;
309 break;
310 default:
311 return -ENOIOCTLCMD;
312 }
313
314 status = rs5c_get_regs(rs5c);
315 if (status < 0)
316 return status;
317
318 addr = RS5C_ADDR(RS5C_REG_CTRL1);
319 switch (cmd) {
320 case RTC_AIE_OFF: /* alarm off */
321 buf &= ~RS5C_CTRL1_AALE;
322 break;
323 case RTC_AIE_ON: /* alarm on */
324 buf |= RS5C_CTRL1_AALE;
325 break;
326 case RTC_UIE_OFF: /* update off */
327 buf &= ~RS5C_CTRL1_CT_MASK;
328 break;
329 case RTC_UIE_ON: /* update on */
330 buf &= ~RS5C_CTRL1_CT_MASK;
331 buf |= RS5C_CTRL1_CT4;
332 break;
333 }
334
335 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
336 printk(KERN_WARNING "%s: can't update alarm\n",
337 rs5c->rtc->name);
338 status = -EIO;
339 } else
340 rs5c->regs[RS5C_REG_CTRL1] = buf;
341
342 return status;
343 }
344
345 #else
346 #define rs5c_rtc_ioctl NULL
347 #endif
348
349
350 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI,
351 * which only exposes a polled programming interface; and since
352 * these calls map directly to those EFI requests; we don't demand
353 * we have an IRQ for this chip when we go through this API.
354 *
355 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
356 * though, managed through RTC_AIE_{ON,OFF} requests.
357 */
358
359 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
360 {
361 struct i2c_client *client = to_i2c_client(dev);
362 struct rs5c372 *rs5c = i2c_get_clientdata(client);
363 int status;
364
365 status = rs5c_get_regs(rs5c);
366 if (status < 0)
367 return status;
368
369 /* report alarm time */
370 t->time.tm_sec = 0;
371 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
372 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
373 t->time.tm_mday = -1;
374 t->time.tm_mon = -1;
375 t->time.tm_year = -1;
376 t->time.tm_wday = -1;
377 t->time.tm_yday = -1;
378 t->time.tm_isdst = -1;
379
380 /* ... and status */
381 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
382 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
383
384 return 0;
385 }
386
387 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
388 {
389 struct i2c_client *client = to_i2c_client(dev);
390 struct rs5c372 *rs5c = i2c_get_clientdata(client);
391 int status, addr, i;
392 unsigned char buf[3];
393
394 /* only handle up to 24 hours in the future, like RTC_ALM_SET */
395 if (t->time.tm_mday != -1
396 || t->time.tm_mon != -1
397 || t->time.tm_year != -1)
398 return -EINVAL;
399
400 /* REVISIT: round up tm_sec */
401
402 /* if needed, disable irq (clears pending status) */
403 status = rs5c_get_regs(rs5c);
404 if (status < 0)
405 return status;
406 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
407 addr = RS5C_ADDR(RS5C_REG_CTRL1);
408 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
409 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
410 pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
411 return -EIO;
412 }
413 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
414 }
415
416 /* set alarm */
417 buf[0] = bin2bcd(t->time.tm_min);
418 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
419 buf[2] = 0x7f; /* any/all days */
420
421 for (i = 0; i < sizeof(buf); i++) {
422 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
423 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
424 pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
425 return -EIO;
426 }
427 }
428
429 /* ... and maybe enable its irq */
430 if (t->enabled) {
431 addr = RS5C_ADDR(RS5C_REG_CTRL1);
432 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
433 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
434 printk(KERN_WARNING "%s: can't enable alarm\n",
435 rs5c->rtc->name);
436 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
437 }
438
439 return 0;
440 }
441
442 #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
443
444 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
445 {
446 int err, osc, trim;
447
448 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
449 if (err == 0) {
450 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
451 osc / 1000, osc % 1000);
452 seq_printf(seq, "trim\t\t: %d\n", trim);
453 }
454
455 return 0;
456 }
457
458 #else
459 #define rs5c372_rtc_proc NULL
460 #endif
461
462 static const struct rtc_class_ops rs5c372_rtc_ops = {
463 .proc = rs5c372_rtc_proc,
464 .ioctl = rs5c_rtc_ioctl,
465 .read_time = rs5c372_rtc_read_time,
466 .set_time = rs5c372_rtc_set_time,
467 .read_alarm = rs5c_read_alarm,
468 .set_alarm = rs5c_set_alarm,
469 };
470
471 #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
472
473 static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
474 struct device_attribute *attr, char *buf)
475 {
476 int err, trim;
477
478 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
479 if (err)
480 return err;
481
482 return sprintf(buf, "%d\n", trim);
483 }
484 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
485
486 static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
487 struct device_attribute *attr, char *buf)
488 {
489 int err, osc;
490
491 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
492 if (err)
493 return err;
494
495 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
496 }
497 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
498
499 static int rs5c_sysfs_register(struct device *dev)
500 {
501 int err;
502
503 err = device_create_file(dev, &dev_attr_trim);
504 if (err)
505 return err;
506 err = device_create_file(dev, &dev_attr_osc);
507 if (err)
508 device_remove_file(dev, &dev_attr_trim);
509
510 return err;
511 }
512
513 static void rs5c_sysfs_unregister(struct device *dev)
514 {
515 device_remove_file(dev, &dev_attr_trim);
516 device_remove_file(dev, &dev_attr_osc);
517 }
518
519 #else
520 static int rs5c_sysfs_register(struct device *dev)
521 {
522 return 0;
523 }
524
525 static void rs5c_sysfs_unregister(struct device *dev)
526 {
527 /* nothing */
528 }
529 #endif /* SYSFS */
530
531 static struct i2c_driver rs5c372_driver;
532
533 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
534 {
535 unsigned char buf[2];
536 int addr, i, ret = 0;
537
538 if (rs5c372->type == rtc_r2025sd) {
539 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
540 return ret;
541 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
542 } else {
543 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
544 return ret;
545 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
546 }
547
548 addr = RS5C_ADDR(RS5C_REG_CTRL1);
549 buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
550 buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
551
552 /* use 24hr mode */
553 switch (rs5c372->type) {
554 case rtc_rs5c372a:
555 case rtc_rs5c372b:
556 buf[1] |= RS5C372_CTRL2_24;
557 rs5c372->time24 = 1;
558 break;
559 case rtc_r2025sd:
560 case rtc_rv5c386:
561 case rtc_rv5c387a:
562 buf[0] |= RV5C387_CTRL1_24;
563 rs5c372->time24 = 1;
564 break;
565 default:
566 /* impossible */
567 break;
568 }
569
570 for (i = 0; i < sizeof(buf); i++) {
571 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
572 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
573 if (unlikely(ret < 0))
574 return ret;
575 }
576
577 rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
578 rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
579
580 return 0;
581 }
582
583 static int rs5c372_probe(struct i2c_client *client,
584 const struct i2c_device_id *id)
585 {
586 int err = 0;
587 int smbus_mode = 0;
588 struct rs5c372 *rs5c372;
589 struct rtc_time tm;
590
591 dev_dbg(&client->dev, "%s\n", __func__);
592
593 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
594 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
595 /*
596 * If we don't have any master mode adapter, try breaking
597 * it down in to the barest of capabilities.
598 */
599 if (i2c_check_functionality(client->adapter,
600 I2C_FUNC_SMBUS_BYTE_DATA |
601 I2C_FUNC_SMBUS_I2C_BLOCK))
602 smbus_mode = 1;
603 else {
604 /* Still no good, give up */
605 err = -ENODEV;
606 goto exit;
607 }
608 }
609
610 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
611 err = -ENOMEM;
612 goto exit;
613 }
614
615 rs5c372->client = client;
616 i2c_set_clientdata(client, rs5c372);
617 rs5c372->type = id->driver_data;
618
619 /* we read registers 0x0f then 0x00-0x0f; skip the first one */
620 rs5c372->regs = &rs5c372->buf[1];
621 rs5c372->smbus = smbus_mode;
622
623 err = rs5c_get_regs(rs5c372);
624 if (err < 0)
625 goto exit_kfree;
626
627 /* clock may be set for am/pm or 24 hr time */
628 switch (rs5c372->type) {
629 case rtc_rs5c372a:
630 case rtc_rs5c372b:
631 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
632 * so does periodic irq, except some 327a modes.
633 */
634 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
635 rs5c372->time24 = 1;
636 break;
637 case rtc_r2025sd:
638 case rtc_rv5c386:
639 case rtc_rv5c387a:
640 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
641 rs5c372->time24 = 1;
642 /* alarm uses ALARM_W; and nINTRB for alarm and periodic
643 * irq, on both 386 and 387
644 */
645 break;
646 default:
647 dev_err(&client->dev, "unknown RTC type\n");
648 goto exit_kfree;
649 }
650
651 /* if the oscillator lost power and no other software (like
652 * the bootloader) set it up, do it here.
653 *
654 * The R2025S/D does this a little differently than the other
655 * parts, so we special case that..
656 */
657 err = rs5c_oscillator_setup(rs5c372);
658 if (unlikely(err < 0)) {
659 dev_err(&client->dev, "setup error\n");
660 goto exit_kfree;
661 }
662
663 if (rs5c372_get_datetime(client, &tm) < 0)
664 dev_warn(&client->dev, "clock needs to be set\n");
665
666 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
667 ({ char *s; switch (rs5c372->type) {
668 case rtc_r2025sd: s = "r2025sd"; break;
669 case rtc_rs5c372a: s = "rs5c372a"; break;
670 case rtc_rs5c372b: s = "rs5c372b"; break;
671 case rtc_rv5c386: s = "rv5c386"; break;
672 case rtc_rv5c387a: s = "rv5c387a"; break;
673 default: s = "chip"; break;
674 }; s;}),
675 rs5c372->time24 ? "24hr" : "am/pm"
676 );
677
678 /* REVISIT use client->irq to register alarm irq ... */
679
680 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
681 &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
682
683 if (IS_ERR(rs5c372->rtc)) {
684 err = PTR_ERR(rs5c372->rtc);
685 goto exit_kfree;
686 }
687
688 err = rs5c_sysfs_register(&client->dev);
689 if (err)
690 goto exit_devreg;
691
692 return 0;
693
694 exit_devreg:
695 rtc_device_unregister(rs5c372->rtc);
696
697 exit_kfree:
698 kfree(rs5c372);
699
700 exit:
701 return err;
702 }
703
704 static int rs5c372_remove(struct i2c_client *client)
705 {
706 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
707
708 rtc_device_unregister(rs5c372->rtc);
709 rs5c_sysfs_unregister(&client->dev);
710 kfree(rs5c372);
711 return 0;
712 }
713
714 static struct i2c_driver rs5c372_driver = {
715 .driver = {
716 .name = "rtc-rs5c372",
717 },
718 .probe = rs5c372_probe,
719 .remove = rs5c372_remove,
720 .id_table = rs5c372_id,
721 };
722
723 static __init int rs5c372_init(void)
724 {
725 return i2c_add_driver(&rs5c372_driver);
726 }
727
728 static __exit void rs5c372_exit(void)
729 {
730 i2c_del_driver(&rs5c372_driver);
731 }
732
733 module_init(rs5c372_init);
734 module_exit(rs5c372_exit);
735
736 MODULE_AUTHOR(
737 "Pavel Mironchik <pmironchik@optifacio.net>, "
738 "Alessandro Zummo <a.zummo@towertech.it>, "
739 "Paul Mundt <lethal@linux-sh.org>");
740 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
741 MODULE_LICENSE("GPL");
742 MODULE_VERSION(DRV_VERSION);
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