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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
67enum rtc_type {
68 rtc_undef = 0,
69 rtc_r2025sd,
70 rtc_rs5c372a,
71 rtc_rs5c372b,
72 rtc_rv5c386,
73 rtc_rv5c387a,
74};
75
76static 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};
84MODULE_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 */
91struct 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
102static 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
147static 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
162static 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
176static 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
207static 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[7];
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
245static 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
274static 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
279static 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
285static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
286{
287 struct i2c_client *client = to_i2c_client(dev);
288 struct rs5c372 *rs5c = i2c_get_clientdata(client);
289 unsigned char buf;
290 int status, addr;
291
292 buf = rs5c->regs[RS5C_REG_CTRL1];
293
294 if (!rs5c->has_irq)
295 return -EINVAL;
296
297 status = rs5c_get_regs(rs5c);
298 if (status < 0)
299 return status;
300
301 addr = RS5C_ADDR(RS5C_REG_CTRL1);
302 if (enabled)
303 buf |= RS5C_CTRL1_AALE;
304 else
305 buf &= ~RS5C_CTRL1_AALE;
306
307 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
308 printk(KERN_WARNING "%s: can't update alarm\n",
309 rs5c->rtc->name);
310 status = -EIO;
311 } else
312 rs5c->regs[RS5C_REG_CTRL1] = buf;
313
314 return status;
315}
316
317
318/* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI,
319 * which only exposes a polled programming interface; and since
320 * these calls map directly to those EFI requests; we don't demand
321 * we have an IRQ for this chip when we go through this API.
322 *
323 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
324 * though, managed through RTC_AIE_{ON,OFF} requests.
325 */
326
327static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
328{
329 struct i2c_client *client = to_i2c_client(dev);
330 struct rs5c372 *rs5c = i2c_get_clientdata(client);
331 int status;
332
333 status = rs5c_get_regs(rs5c);
334 if (status < 0)
335 return status;
336
337 /* report alarm time */
338 t->time.tm_sec = 0;
339 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
340 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
341 t->time.tm_mday = -1;
342 t->time.tm_mon = -1;
343 t->time.tm_year = -1;
344 t->time.tm_wday = -1;
345 t->time.tm_yday = -1;
346 t->time.tm_isdst = -1;
347
348 /* ... and status */
349 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
350 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
351
352 return 0;
353}
354
355static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
356{
357 struct i2c_client *client = to_i2c_client(dev);
358 struct rs5c372 *rs5c = i2c_get_clientdata(client);
359 int status, addr, i;
360 unsigned char buf[3];
361
362 /* only handle up to 24 hours in the future, like RTC_ALM_SET */
363 if (t->time.tm_mday != -1
364 || t->time.tm_mon != -1
365 || t->time.tm_year != -1)
366 return -EINVAL;
367
368 /* REVISIT: round up tm_sec */
369
370 /* if needed, disable irq (clears pending status) */
371 status = rs5c_get_regs(rs5c);
372 if (status < 0)
373 return status;
374 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
375 addr = RS5C_ADDR(RS5C_REG_CTRL1);
376 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
377 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
378 pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
379 return -EIO;
380 }
381 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
382 }
383
384 /* set alarm */
385 buf[0] = bin2bcd(t->time.tm_min);
386 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
387 buf[2] = 0x7f; /* any/all days */
388
389 for (i = 0; i < sizeof(buf); i++) {
390 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
391 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
392 pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
393 return -EIO;
394 }
395 }
396
397 /* ... and maybe enable its irq */
398 if (t->enabled) {
399 addr = RS5C_ADDR(RS5C_REG_CTRL1);
400 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
401 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
402 printk(KERN_WARNING "%s: can't enable alarm\n",
403 rs5c->rtc->name);
404 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
405 }
406
407 return 0;
408}
409
410#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
411
412static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
413{
414 int err, osc, trim;
415
416 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
417 if (err == 0) {
418 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
419 osc / 1000, osc % 1000);
420 seq_printf(seq, "trim\t\t: %d\n", trim);
421 }
422
423 return 0;
424}
425
426#else
427#define rs5c372_rtc_proc NULL
428#endif
429
430static const struct rtc_class_ops rs5c372_rtc_ops = {
431 .proc = rs5c372_rtc_proc,
432 .read_time = rs5c372_rtc_read_time,
433 .set_time = rs5c372_rtc_set_time,
434 .read_alarm = rs5c_read_alarm,
435 .set_alarm = rs5c_set_alarm,
436 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
437};
438
439#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
440
441static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
442 struct device_attribute *attr, char *buf)
443{
444 int err, trim;
445
446 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
447 if (err)
448 return err;
449
450 return sprintf(buf, "%d\n", trim);
451}
452static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
453
454static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
455 struct device_attribute *attr, char *buf)
456{
457 int err, osc;
458
459 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
460 if (err)
461 return err;
462
463 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
464}
465static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
466
467static int rs5c_sysfs_register(struct device *dev)
468{
469 int err;
470
471 err = device_create_file(dev, &dev_attr_trim);
472 if (err)
473 return err;
474 err = device_create_file(dev, &dev_attr_osc);
475 if (err)
476 device_remove_file(dev, &dev_attr_trim);
477
478 return err;
479}
480
481static void rs5c_sysfs_unregister(struct device *dev)
482{
483 device_remove_file(dev, &dev_attr_trim);
484 device_remove_file(dev, &dev_attr_osc);
485}
486
487#else
488static int rs5c_sysfs_register(struct device *dev)
489{
490 return 0;
491}
492
493static void rs5c_sysfs_unregister(struct device *dev)
494{
495 /* nothing */
496}
497#endif /* SYSFS */
498
499static struct i2c_driver rs5c372_driver;
500
501static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
502{
503 unsigned char buf[2];
504 int addr, i, ret = 0;
505
506 if (rs5c372->type == rtc_r2025sd) {
507 if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
508 return ret;
509 rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
510 } else {
511 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
512 return ret;
513 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
514 }
515
516 addr = RS5C_ADDR(RS5C_REG_CTRL1);
517 buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
518 buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
519
520 /* use 24hr mode */
521 switch (rs5c372->type) {
522 case rtc_rs5c372a:
523 case rtc_rs5c372b:
524 buf[1] |= RS5C372_CTRL2_24;
525 rs5c372->time24 = 1;
526 break;
527 case rtc_r2025sd:
528 case rtc_rv5c386:
529 case rtc_rv5c387a:
530 buf[0] |= RV5C387_CTRL1_24;
531 rs5c372->time24 = 1;
532 break;
533 default:
534 /* impossible */
535 break;
536 }
537
538 for (i = 0; i < sizeof(buf); i++) {
539 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
540 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
541 if (unlikely(ret < 0))
542 return ret;
543 }
544
545 rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
546 rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
547
548 return 0;
549}
550
551static int rs5c372_probe(struct i2c_client *client,
552 const struct i2c_device_id *id)
553{
554 int err = 0;
555 int smbus_mode = 0;
556 struct rs5c372 *rs5c372;
557 struct rtc_time tm;
558
559 dev_dbg(&client->dev, "%s\n", __func__);
560
561 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
562 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
563 /*
564 * If we don't have any master mode adapter, try breaking
565 * it down in to the barest of capabilities.
566 */
567 if (i2c_check_functionality(client->adapter,
568 I2C_FUNC_SMBUS_BYTE_DATA |
569 I2C_FUNC_SMBUS_I2C_BLOCK))
570 smbus_mode = 1;
571 else {
572 /* Still no good, give up */
573 err = -ENODEV;
574 goto exit;
575 }
576 }
577
578 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
579 err = -ENOMEM;
580 goto exit;
581 }
582
583 rs5c372->client = client;
584 i2c_set_clientdata(client, rs5c372);
585 rs5c372->type = id->driver_data;
586
587 /* we read registers 0x0f then 0x00-0x0f; skip the first one */
588 rs5c372->regs = &rs5c372->buf[1];
589 rs5c372->smbus = smbus_mode;
590
591 err = rs5c_get_regs(rs5c372);
592 if (err < 0)
593 goto exit_kfree;
594
595 /* clock may be set for am/pm or 24 hr time */
596 switch (rs5c372->type) {
597 case rtc_rs5c372a:
598 case rtc_rs5c372b:
599 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
600 * so does periodic irq, except some 327a modes.
601 */
602 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
603 rs5c372->time24 = 1;
604 break;
605 case rtc_r2025sd:
606 case rtc_rv5c386:
607 case rtc_rv5c387a:
608 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
609 rs5c372->time24 = 1;
610 /* alarm uses ALARM_W; and nINTRB for alarm and periodic
611 * irq, on both 386 and 387
612 */
613 break;
614 default:
615 dev_err(&client->dev, "unknown RTC type\n");
616 goto exit_kfree;
617 }
618
619 /* if the oscillator lost power and no other software (like
620 * the bootloader) set it up, do it here.
621 *
622 * The R2025S/D does this a little differently than the other
623 * parts, so we special case that..
624 */
625 err = rs5c_oscillator_setup(rs5c372);
626 if (unlikely(err < 0)) {
627 dev_err(&client->dev, "setup error\n");
628 goto exit_kfree;
629 }
630
631 if (rs5c372_get_datetime(client, &tm) < 0)
632 dev_warn(&client->dev, "clock needs to be set\n");
633
634 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
635 ({ char *s; switch (rs5c372->type) {
636 case rtc_r2025sd: s = "r2025sd"; break;
637 case rtc_rs5c372a: s = "rs5c372a"; break;
638 case rtc_rs5c372b: s = "rs5c372b"; break;
639 case rtc_rv5c386: s = "rv5c386"; break;
640 case rtc_rv5c387a: s = "rv5c387a"; break;
641 default: s = "chip"; break;
642 }; s;}),
643 rs5c372->time24 ? "24hr" : "am/pm"
644 );
645
646 /* REVISIT use client->irq to register alarm irq ... */
647
648 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
649 &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
650
651 if (IS_ERR(rs5c372->rtc)) {
652 err = PTR_ERR(rs5c372->rtc);
653 goto exit_kfree;
654 }
655
656 err = rs5c_sysfs_register(&client->dev);
657 if (err)
658 goto exit_devreg;
659
660 return 0;
661
662exit_devreg:
663 rtc_device_unregister(rs5c372->rtc);
664
665exit_kfree:
666 kfree(rs5c372);
667
668exit:
669 return err;
670}
671
672static int rs5c372_remove(struct i2c_client *client)
673{
674 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
675
676 rtc_device_unregister(rs5c372->rtc);
677 rs5c_sysfs_unregister(&client->dev);
678 kfree(rs5c372);
679 return 0;
680}
681
682static struct i2c_driver rs5c372_driver = {
683 .driver = {
684 .name = "rtc-rs5c372",
685 },
686 .probe = rs5c372_probe,
687 .remove = rs5c372_remove,
688 .id_table = rs5c372_id,
689};
690
691static __init int rs5c372_init(void)
692{
693 return i2c_add_driver(&rs5c372_driver);
694}
695
696static __exit void rs5c372_exit(void)
697{
698 i2c_del_driver(&rs5c372_driver);
699}
700
701module_init(rs5c372_init);
702module_exit(rs5c372_exit);
703
704MODULE_AUTHOR(
705 "Pavel Mironchik <pmironchik@optifacio.net>, "
706 "Alessandro Zummo <a.zummo@towertech.it>, "
707 "Paul Mundt <lethal@linux-sh.org>");
708MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
709MODULE_LICENSE("GPL");
710MODULE_VERSION(DRV_VERSION);
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
68enum 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
78static 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};
87MODULE_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 */
94struct 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
105static 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
155static 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
170static 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
184static 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
215static 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
253static 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
282static 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
287static 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
293static 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
334static 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
362static 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
418static 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
436static 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
447static 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}
458static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
459
460static 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}
471static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
472
473static 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
487static 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
494static int rs5c_sysfs_register(struct device *dev)
495{
496 return 0;
497}
498
499static void rs5c_sysfs_unregister(struct device *dev)
500{
501 /* nothing */
502}
503#endif /* SYSFS */
504
505static struct i2c_driver rs5c372_driver;
506
507static 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
558static 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
673exit:
674 return err;
675}
676
677static int rs5c372_remove(struct i2c_client *client)
678{
679 rs5c_sysfs_unregister(&client->dev);
680 return 0;
681}
682
683static 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
692module_i2c_driver(rs5c372_driver);
693
694MODULE_AUTHOR(
695 "Pavel Mironchik <pmironchik@optifacio.net>, "
696 "Alessandro Zummo <a.zummo@towertech.it>, "
697 "Paul Mundt <lethal@linux-sh.org>");
698MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
699MODULE_LICENSE("GPL");
700MODULE_VERSION(DRV_VERSION);