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 #include <linux/of_device.h>
19
20 /*
21 * Ricoh has a family of I2C based RTCs, which differ only slightly from
22 * each other. Differences center on pinout (e.g. how many interrupts,
23 * output clock, etc) and how the control registers are used. The '372
24 * is significant only because that's the one this driver first supported.
25 */
26 #define RS5C372_REG_SECS 0
27 #define RS5C372_REG_MINS 1
28 #define RS5C372_REG_HOURS 2
29 #define RS5C372_REG_WDAY 3
30 #define RS5C372_REG_DAY 4
31 #define RS5C372_REG_MONTH 5
32 #define RS5C372_REG_YEAR 6
33 #define RS5C372_REG_TRIM 7
34 # define RS5C372_TRIM_XSL 0x80
35 # define RS5C372_TRIM_MASK 0x7F
36
37 #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */
38 #define RS5C_REG_ALARM_A_HOURS 9
39 #define RS5C_REG_ALARM_A_WDAY 10
40
41 #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */
42 #define RS5C_REG_ALARM_B_HOURS 12
43 #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */
44
45 #define RS5C_REG_CTRL1 14
46 # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */
47 # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */
48 # define RV5C387_CTRL1_24 (1 << 5)
49 # define RS5C372A_CTRL1_SL1 (1 << 5)
50 # define RS5C_CTRL1_CT_MASK (7 << 0)
51 # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */
52 # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */
53 #define RS5C_REG_CTRL2 15
54 # define RS5C372_CTRL2_24 (1 << 5)
55 # define R2025_CTRL2_XST (1 << 5)
56 # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */
57 # define RS5C_CTRL2_CTFG (1 << 2)
58 # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */
59 # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */
60
61
62 /* to read (style 1) or write registers starting at R */
63 #define RS5C_ADDR(R) (((R) << 4) | 0)
64
65
66 enum rtc_type {
67 rtc_undef = 0,
68 rtc_r2025sd,
69 rtc_r2221tl,
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 { "r2221tl", rtc_r2221tl },
79 { "rs5c372a", rtc_rs5c372a },
80 { "rs5c372b", rtc_rs5c372b },
81 { "rv5c386", rtc_rv5c386 },
82 { "rv5c387a", rtc_rv5c387a },
83 { }
84 };
85 MODULE_DEVICE_TABLE(i2c, rs5c372_id);
86
87 static const struct of_device_id rs5c372_of_match[] = {
88 {
89 .compatible = "ricoh,r2025sd",
90 .data = (void *)rtc_r2025sd
91 },
92 {
93 .compatible = "ricoh,r2221tl",
94 .data = (void *)rtc_r2221tl
95 },
96 {
97 .compatible = "ricoh,rs5c372a",
98 .data = (void *)rtc_rs5c372a
99 },
100 {
101 .compatible = "ricoh,rs5c372b",
102 .data = (void *)rtc_rs5c372b
103 },
104 {
105 .compatible = "ricoh,rv5c386",
106 .data = (void *)rtc_rv5c386
107 },
108 {
109 .compatible = "ricoh,rv5c387a",
110 .data = (void *)rtc_rv5c387a
111 },
112 { }
113 };
114 MODULE_DEVICE_TABLE(of, rs5c372_of_match);
115
116 /* REVISIT: this assumes that:
117 * - we're in the 21st century, so it's safe to ignore the century
118 * bit for rv5c38[67] (REG_MONTH bit 7);
119 * - we should use ALARM_A not ALARM_B (may be wrong on some boards)
120 */
121 struct rs5c372 {
122 struct i2c_client *client;
123 struct rtc_device *rtc;
124 enum rtc_type type;
125 unsigned time24:1;
126 unsigned has_irq:1;
127 unsigned smbus:1;
128 char buf[17];
129 char *regs;
130 };
131
rs5c_get_regs(struct rs5c372 * rs5c)132 static int rs5c_get_regs(struct rs5c372 *rs5c)
133 {
134 struct i2c_client *client = rs5c->client;
135 struct i2c_msg msgs[] = {
136 {
137 .addr = client->addr,
138 .flags = I2C_M_RD,
139 .len = sizeof(rs5c->buf),
140 .buf = rs5c->buf
141 },
142 };
143
144 /* This implements the third reading method from the datasheet, using
145 * an internal address that's reset after each transaction (by STOP)
146 * to 0x0f ... so we read extra registers, and skip the first one.
147 *
148 * The first method doesn't work with the iop3xx adapter driver, on at
149 * least 80219 chips; this works around that bug.
150 *
151 * The third method on the other hand doesn't work for the SMBus-only
152 * configurations, so we use the the first method there, stripping off
153 * the extra register in the process.
154 */
155 if (rs5c->smbus) {
156 int addr = RS5C_ADDR(RS5C372_REG_SECS);
157 int size = sizeof(rs5c->buf) - 1;
158
159 if (i2c_smbus_read_i2c_block_data(client, addr, size,
160 rs5c->buf + 1) != size) {
161 dev_warn(&client->dev, "can't read registers\n");
162 return -EIO;
163 }
164 } else {
165 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
166 dev_warn(&client->dev, "can't read registers\n");
167 return -EIO;
168 }
169 }
170
171 dev_dbg(&client->dev,
172 "%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n",
173 rs5c->regs + 0, rs5c->regs[3],
174 rs5c->regs + 4, rs5c->regs[7],
175 rs5c->regs + 8, rs5c->regs + 11,
176 rs5c->regs[14], rs5c->regs[15]);
177
178 return 0;
179 }
180
rs5c_reg2hr(struct rs5c372 * rs5c,unsigned reg)181 static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
182 {
183 unsigned hour;
184
185 if (rs5c->time24)
186 return bcd2bin(reg & 0x3f);
187
188 hour = bcd2bin(reg & 0x1f);
189 if (hour == 12)
190 hour = 0;
191 if (reg & 0x20)
192 hour += 12;
193 return hour;
194 }
195
rs5c_hr2reg(struct rs5c372 * rs5c,unsigned hour)196 static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
197 {
198 if (rs5c->time24)
199 return bin2bcd(hour);
200
201 if (hour > 12)
202 return 0x20 | bin2bcd(hour - 12);
203 if (hour == 12)
204 return 0x20 | bin2bcd(12);
205 if (hour == 0)
206 return bin2bcd(12);
207 return bin2bcd(hour);
208 }
209
rs5c372_rtc_read_time(struct device * dev,struct rtc_time * tm)210 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
211 {
212 struct i2c_client *client = to_i2c_client(dev);
213 struct rs5c372 *rs5c = i2c_get_clientdata(client);
214 int status = rs5c_get_regs(rs5c);
215
216 if (status < 0)
217 return status;
218
219 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
220 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
221 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
222
223 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
224 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
225
226 /* tm->tm_mon is zero-based */
227 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
228
229 /* year is 1900 + tm->tm_year */
230 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;
231
232 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
233 "mday=%d, mon=%d, year=%d, wday=%d\n",
234 __func__,
235 tm->tm_sec, tm->tm_min, tm->tm_hour,
236 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
237
238 return 0;
239 }
240
rs5c372_rtc_set_time(struct device * dev,struct rtc_time * tm)241 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
242 {
243 struct i2c_client *client = to_i2c_client(dev);
244 struct rs5c372 *rs5c = i2c_get_clientdata(client);
245 unsigned char buf[7];
246 int addr;
247
248 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
249 "mday=%d, mon=%d, year=%d, wday=%d\n",
250 __func__,
251 tm->tm_sec, tm->tm_min, tm->tm_hour,
252 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
253
254 addr = RS5C_ADDR(RS5C372_REG_SECS);
255 buf[0] = bin2bcd(tm->tm_sec);
256 buf[1] = bin2bcd(tm->tm_min);
257 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
258 buf[3] = bin2bcd(tm->tm_wday);
259 buf[4] = bin2bcd(tm->tm_mday);
260 buf[5] = bin2bcd(tm->tm_mon + 1);
261 buf[6] = bin2bcd(tm->tm_year - 100);
262
263 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
264 dev_err(&client->dev, "%s: write error\n", __func__);
265 return -EIO;
266 }
267
268 return 0;
269 }
270
271 #if IS_ENABLED(CONFIG_RTC_INTF_PROC)
272 #define NEED_TRIM
273 #endif
274
275 #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS)
276 #define NEED_TRIM
277 #endif
278
279 #ifdef NEED_TRIM
rs5c372_get_trim(struct i2c_client * client,int * osc,int * trim)280 static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
281 {
282 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
283 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
284
285 if (osc)
286 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
287
288 if (trim) {
289 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
290 tmp &= RS5C372_TRIM_MASK;
291 if (tmp & 0x3e) {
292 int t = tmp & 0x3f;
293
294 if (tmp & 0x40)
295 t = (~t | (s8)0xc0) + 1;
296 else
297 t = t - 1;
298
299 tmp = t * 2;
300 } else
301 tmp = 0;
302 *trim = tmp;
303 }
304
305 return 0;
306 }
307 #endif
308
rs5c_rtc_alarm_irq_enable(struct device * dev,unsigned int enabled)309 static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
310 {
311 struct i2c_client *client = to_i2c_client(dev);
312 struct rs5c372 *rs5c = i2c_get_clientdata(client);
313 unsigned char buf;
314 int status, addr;
315
316 buf = rs5c->regs[RS5C_REG_CTRL1];
317
318 if (!rs5c->has_irq)
319 return -EINVAL;
320
321 status = rs5c_get_regs(rs5c);
322 if (status < 0)
323 return status;
324
325 addr = RS5C_ADDR(RS5C_REG_CTRL1);
326 if (enabled)
327 buf |= RS5C_CTRL1_AALE;
328 else
329 buf &= ~RS5C_CTRL1_AALE;
330
331 if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
332 dev_warn(dev, "can't update alarm\n");
333 status = -EIO;
334 } else
335 rs5c->regs[RS5C_REG_CTRL1] = buf;
336
337 return status;
338 }
339
340
341 /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI,
342 * which only exposes a polled programming interface; and since
343 * these calls map directly to those EFI requests; we don't demand
344 * we have an IRQ for this chip when we go through this API.
345 *
346 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
347 * though, managed through RTC_AIE_{ON,OFF} requests.
348 */
349
rs5c_read_alarm(struct device * dev,struct rtc_wkalrm * t)350 static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
351 {
352 struct i2c_client *client = to_i2c_client(dev);
353 struct rs5c372 *rs5c = i2c_get_clientdata(client);
354 int status;
355
356 status = rs5c_get_regs(rs5c);
357 if (status < 0)
358 return status;
359
360 /* report alarm time */
361 t->time.tm_sec = 0;
362 t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
363 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
364
365 /* ... and status */
366 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
367 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
368
369 return 0;
370 }
371
rs5c_set_alarm(struct device * dev,struct rtc_wkalrm * t)372 static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
373 {
374 struct i2c_client *client = to_i2c_client(dev);
375 struct rs5c372 *rs5c = i2c_get_clientdata(client);
376 int status, addr, i;
377 unsigned char buf[3];
378
379 /* only handle up to 24 hours in the future, like RTC_ALM_SET */
380 if (t->time.tm_mday != -1
381 || t->time.tm_mon != -1
382 || t->time.tm_year != -1)
383 return -EINVAL;
384
385 /* REVISIT: round up tm_sec */
386
387 /* if needed, disable irq (clears pending status) */
388 status = rs5c_get_regs(rs5c);
389 if (status < 0)
390 return status;
391 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
392 addr = RS5C_ADDR(RS5C_REG_CTRL1);
393 buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
394 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
395 dev_dbg(dev, "can't disable alarm\n");
396 return -EIO;
397 }
398 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
399 }
400
401 /* set alarm */
402 buf[0] = bin2bcd(t->time.tm_min);
403 buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
404 buf[2] = 0x7f; /* any/all days */
405
406 for (i = 0; i < sizeof(buf); i++) {
407 addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
408 if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
409 dev_dbg(dev, "can't set alarm time\n");
410 return -EIO;
411 }
412 }
413
414 /* ... and maybe enable its irq */
415 if (t->enabled) {
416 addr = RS5C_ADDR(RS5C_REG_CTRL1);
417 buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
418 if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
419 dev_warn(dev, "can't enable alarm\n");
420 rs5c->regs[RS5C_REG_CTRL1] = buf[0];
421 }
422
423 return 0;
424 }
425
426 #if IS_ENABLED(CONFIG_RTC_INTF_PROC)
427
rs5c372_rtc_proc(struct device * dev,struct seq_file * seq)428 static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
429 {
430 int err, osc, trim;
431
432 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
433 if (err == 0) {
434 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
435 osc / 1000, osc % 1000);
436 seq_printf(seq, "trim\t\t: %d\n", trim);
437 }
438
439 return 0;
440 }
441
442 #else
443 #define rs5c372_rtc_proc NULL
444 #endif
445
446 static const struct rtc_class_ops rs5c372_rtc_ops = {
447 .proc = rs5c372_rtc_proc,
448 .read_time = rs5c372_rtc_read_time,
449 .set_time = rs5c372_rtc_set_time,
450 .read_alarm = rs5c_read_alarm,
451 .set_alarm = rs5c_set_alarm,
452 .alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
453 };
454
455 #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS)
456
rs5c372_sysfs_show_trim(struct device * dev,struct device_attribute * attr,char * buf)457 static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
458 struct device_attribute *attr, char *buf)
459 {
460 int err, trim;
461
462 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
463 if (err)
464 return err;
465
466 return sprintf(buf, "%d\n", trim);
467 }
468 static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
469
rs5c372_sysfs_show_osc(struct device * dev,struct device_attribute * attr,char * buf)470 static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
471 struct device_attribute *attr, char *buf)
472 {
473 int err, osc;
474
475 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
476 if (err)
477 return err;
478
479 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
480 }
481 static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
482
rs5c_sysfs_register(struct device * dev)483 static int rs5c_sysfs_register(struct device *dev)
484 {
485 int err;
486
487 err = device_create_file(dev, &dev_attr_trim);
488 if (err)
489 return err;
490 err = device_create_file(dev, &dev_attr_osc);
491 if (err)
492 device_remove_file(dev, &dev_attr_trim);
493
494 return err;
495 }
496
rs5c_sysfs_unregister(struct device * dev)497 static void rs5c_sysfs_unregister(struct device *dev)
498 {
499 device_remove_file(dev, &dev_attr_trim);
500 device_remove_file(dev, &dev_attr_osc);
501 }
502
503 #else
rs5c_sysfs_register(struct device * dev)504 static int rs5c_sysfs_register(struct device *dev)
505 {
506 return 0;
507 }
508
rs5c_sysfs_unregister(struct device * dev)509 static void rs5c_sysfs_unregister(struct device *dev)
510 {
511 /* nothing */
512 }
513 #endif /* SYSFS */
514
515 static struct i2c_driver rs5c372_driver;
516
rs5c_oscillator_setup(struct rs5c372 * rs5c372)517 static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
518 {
519 unsigned char buf[2];
520 int addr, i, ret = 0;
521
522 if (rs5c372->type == rtc_r2025sd) {
523 if (rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)
524 return ret;
525 rs5c372->regs[RS5C_REG_CTRL2] |= R2025_CTRL2_XST;
526 } else {
527 if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
528 return ret;
529 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
530 }
531
532 addr = RS5C_ADDR(RS5C_REG_CTRL1);
533 buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
534 buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
535
536 /* use 24hr mode */
537 switch (rs5c372->type) {
538 case rtc_rs5c372a:
539 case rtc_rs5c372b:
540 buf[1] |= RS5C372_CTRL2_24;
541 rs5c372->time24 = 1;
542 break;
543 case rtc_r2025sd:
544 case rtc_r2221tl:
545 case rtc_rv5c386:
546 case rtc_rv5c387a:
547 buf[0] |= RV5C387_CTRL1_24;
548 rs5c372->time24 = 1;
549 break;
550 default:
551 /* impossible */
552 break;
553 }
554
555 for (i = 0; i < sizeof(buf); i++) {
556 addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
557 ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
558 if (unlikely(ret < 0))
559 return ret;
560 }
561
562 rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
563 rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
564
565 return 0;
566 }
567
rs5c372_probe(struct i2c_client * client,const struct i2c_device_id * id)568 static int rs5c372_probe(struct i2c_client *client,
569 const struct i2c_device_id *id)
570 {
571 int err = 0;
572 int smbus_mode = 0;
573 struct rs5c372 *rs5c372;
574
575 dev_dbg(&client->dev, "%s\n", __func__);
576
577 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
578 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
579 /*
580 * If we don't have any master mode adapter, try breaking
581 * it down in to the barest of capabilities.
582 */
583 if (i2c_check_functionality(client->adapter,
584 I2C_FUNC_SMBUS_BYTE_DATA |
585 I2C_FUNC_SMBUS_I2C_BLOCK))
586 smbus_mode = 1;
587 else {
588 /* Still no good, give up */
589 err = -ENODEV;
590 goto exit;
591 }
592 }
593
594 rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372),
595 GFP_KERNEL);
596 if (!rs5c372) {
597 err = -ENOMEM;
598 goto exit;
599 }
600
601 rs5c372->client = client;
602 i2c_set_clientdata(client, rs5c372);
603 if (client->dev.of_node)
604 rs5c372->type = (enum rtc_type)
605 of_device_get_match_data(&client->dev);
606 else
607 rs5c372->type = id->driver_data;
608
609 /* we read registers 0x0f then 0x00-0x0f; skip the first one */
610 rs5c372->regs = &rs5c372->buf[1];
611 rs5c372->smbus = smbus_mode;
612
613 err = rs5c_get_regs(rs5c372);
614 if (err < 0)
615 goto exit;
616
617 /* clock may be set for am/pm or 24 hr time */
618 switch (rs5c372->type) {
619 case rtc_rs5c372a:
620 case rtc_rs5c372b:
621 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
622 * so does periodic irq, except some 327a modes.
623 */
624 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
625 rs5c372->time24 = 1;
626 break;
627 case rtc_r2025sd:
628 case rtc_r2221tl:
629 case rtc_rv5c386:
630 case rtc_rv5c387a:
631 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
632 rs5c372->time24 = 1;
633 /* alarm uses ALARM_W; and nINTRB for alarm and periodic
634 * irq, on both 386 and 387
635 */
636 break;
637 default:
638 dev_err(&client->dev, "unknown RTC type\n");
639 goto exit;
640 }
641
642 /* if the oscillator lost power and no other software (like
643 * the bootloader) set it up, do it here.
644 *
645 * The R2025S/D does this a little differently than the other
646 * parts, so we special case that..
647 */
648 err = rs5c_oscillator_setup(rs5c372);
649 if (unlikely(err < 0)) {
650 dev_err(&client->dev, "setup error\n");
651 goto exit;
652 }
653
654 dev_info(&client->dev, "%s found, %s\n",
655 ({ char *s; switch (rs5c372->type) {
656 case rtc_r2025sd: s = "r2025sd"; break;
657 case rtc_r2221tl: s = "r2221tl"; break;
658 case rtc_rs5c372a: s = "rs5c372a"; break;
659 case rtc_rs5c372b: s = "rs5c372b"; break;
660 case rtc_rv5c386: s = "rv5c386"; break;
661 case rtc_rv5c387a: s = "rv5c387a"; break;
662 default: s = "chip"; break;
663 }; s;}),
664 rs5c372->time24 ? "24hr" : "am/pm"
665 );
666
667 /* REVISIT use client->irq to register alarm irq ... */
668 rs5c372->rtc = devm_rtc_device_register(&client->dev,
669 rs5c372_driver.driver.name,
670 &rs5c372_rtc_ops, THIS_MODULE);
671
672 if (IS_ERR(rs5c372->rtc)) {
673 err = PTR_ERR(rs5c372->rtc);
674 goto exit;
675 }
676
677 err = rs5c_sysfs_register(&client->dev);
678 if (err)
679 goto exit;
680
681 return 0;
682
683 exit:
684 return err;
685 }
686
rs5c372_remove(struct i2c_client * client)687 static int rs5c372_remove(struct i2c_client *client)
688 {
689 rs5c_sysfs_unregister(&client->dev);
690 return 0;
691 }
692
693 static struct i2c_driver rs5c372_driver = {
694 .driver = {
695 .name = "rtc-rs5c372",
696 .of_match_table = of_match_ptr(rs5c372_of_match),
697 },
698 .probe = rs5c372_probe,
699 .remove = rs5c372_remove,
700 .id_table = rs5c372_id,
701 };
702
703 module_i2c_driver(rs5c372_driver);
704
705 MODULE_AUTHOR(
706 "Pavel Mironchik <pmironchik@optifacio.net>, "
707 "Alessandro Zummo <a.zummo@towertech.it>, "
708 "Paul Mundt <lethal@linux-sh.org>");
709 MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
710 MODULE_LICENSE("GPL");
711