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1/*
2 * rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip.
3 *
4 * Copyright (C) 2008 Sergey Lapin
5 * Based on ds1307 driver by James Chapman and David Brownell
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/i2c.h>
14#include <linux/rtc.h>
15#include <linux/bcd.h>
16#include <linux/slab.h>
17
18#define FM3130_RTC_CONTROL (0x0)
19#define FM3130_CAL_CONTROL (0x1)
20#define FM3130_RTC_SECONDS (0x2)
21#define FM3130_RTC_MINUTES (0x3)
22#define FM3130_RTC_HOURS (0x4)
23#define FM3130_RTC_DAY (0x5)
24#define FM3130_RTC_DATE (0x6)
25#define FM3130_RTC_MONTHS (0x7)
26#define FM3130_RTC_YEARS (0x8)
27
28#define FM3130_ALARM_SECONDS (0x9)
29#define FM3130_ALARM_MINUTES (0xa)
30#define FM3130_ALARM_HOURS (0xb)
31#define FM3130_ALARM_DATE (0xc)
32#define FM3130_ALARM_MONTHS (0xd)
33#define FM3130_ALARM_WP_CONTROL (0xe)
34
35#define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */
36#define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */
37#define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */
38#define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */
39#define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */
40#define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */
41#define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */
42#define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */
43#define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */
44
45#define FM3130_CLOCK_REGS 7
46#define FM3130_ALARM_REGS 5
47
48struct fm3130 {
49 u8 reg_addr_time;
50 u8 reg_addr_alarm;
51 u8 regs[15];
52 struct i2c_msg msg[4];
53 struct i2c_client *client;
54 struct rtc_device *rtc;
55 int alarm_valid;
56 int data_valid;
57};
58static const struct i2c_device_id fm3130_id[] = {
59 { "fm3130", 0 },
60 { }
61};
62MODULE_DEVICE_TABLE(i2c, fm3130_id);
63
64#define FM3130_MODE_NORMAL 0
65#define FM3130_MODE_WRITE 1
66#define FM3130_MODE_READ 2
67
68static void fm3130_rtc_mode(struct device *dev, int mode)
69{
70 struct fm3130 *fm3130 = dev_get_drvdata(dev);
71
72 fm3130->regs[FM3130_RTC_CONTROL] =
73 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
74 switch (mode) {
75 case FM3130_MODE_NORMAL:
76 fm3130->regs[FM3130_RTC_CONTROL] &=
77 ~(FM3130_RTC_CONTROL_BIT_WRITE |
78 FM3130_RTC_CONTROL_BIT_READ);
79 break;
80 case FM3130_MODE_WRITE:
81 fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE;
82 break;
83 case FM3130_MODE_READ:
84 fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ;
85 break;
86 default:
87 dev_dbg(dev, "invalid mode %d\n", mode);
88 break;
89 }
90
91 i2c_smbus_write_byte_data(fm3130->client,
92 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]);
93}
94
95static int fm3130_get_time(struct device *dev, struct rtc_time *t)
96{
97 struct fm3130 *fm3130 = dev_get_drvdata(dev);
98 int tmp;
99
100 if (!fm3130->data_valid) {
101 /* We have invalid data in RTC, probably due
102 to battery faults or other problems. Return EIO
103 for now, it will allow us to set data later instead
104 of error during probing which disables device */
105 return -EIO;
106 }
107 fm3130_rtc_mode(dev, FM3130_MODE_READ);
108
109 /* read the RTC date and time registers all at once */
110 tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
111 fm3130->msg, 2);
112 if (tmp != 2) {
113 dev_err(dev, "%s error %d\n", "read", tmp);
114 return -EIO;
115 }
116
117 fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
118
119 dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x %02x"
120 "%02x %02x %02x %02x %02x %02x %02x\n",
121 "read",
122 fm3130->regs[0], fm3130->regs[1],
123 fm3130->regs[2], fm3130->regs[3],
124 fm3130->regs[4], fm3130->regs[5],
125 fm3130->regs[6], fm3130->regs[7],
126 fm3130->regs[8], fm3130->regs[9],
127 fm3130->regs[0xa], fm3130->regs[0xb],
128 fm3130->regs[0xc], fm3130->regs[0xd],
129 fm3130->regs[0xe]);
130
131 t->tm_sec = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
132 t->tm_min = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
133 tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f;
134 t->tm_hour = bcd2bin(tmp);
135 t->tm_wday = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1;
136 t->tm_mday = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
137 tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f;
138 t->tm_mon = bcd2bin(tmp) - 1;
139
140 /* assume 20YY not 19YY, and ignore CF bit */
141 t->tm_year = bcd2bin(fm3130->regs[FM3130_RTC_YEARS]) + 100;
142
143 dev_dbg(dev, "%s secs=%d, mins=%d, "
144 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
145 "read", t->tm_sec, t->tm_min,
146 t->tm_hour, t->tm_mday,
147 t->tm_mon, t->tm_year, t->tm_wday);
148
149 /* initial clock setting can be undefined */
150 return rtc_valid_tm(t);
151}
152
153
154static int fm3130_set_time(struct device *dev, struct rtc_time *t)
155{
156 struct fm3130 *fm3130 = dev_get_drvdata(dev);
157 int tmp, i;
158 u8 *buf = fm3130->regs;
159
160 dev_dbg(dev, "%s secs=%d, mins=%d, "
161 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
162 "write", t->tm_sec, t->tm_min,
163 t->tm_hour, t->tm_mday,
164 t->tm_mon, t->tm_year, t->tm_wday);
165
166 /* first register addr */
167 buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec);
168 buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min);
169 buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour);
170 buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1);
171 buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday);
172 buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1);
173
174 /* assume 20YY not 19YY */
175 tmp = t->tm_year - 100;
176 buf[FM3130_RTC_YEARS] = bin2bcd(tmp);
177
178 dev_dbg(dev, "%s: %02x %02x %02x %02x %02x %02x %02x"
179 "%02x %02x %02x %02x %02x %02x %02x %02x\n",
180 "write", buf[0], buf[1], buf[2], buf[3],
181 buf[4], buf[5], buf[6], buf[7],
182 buf[8], buf[9], buf[0xa], buf[0xb],
183 buf[0xc], buf[0xd], buf[0xe]);
184
185 fm3130_rtc_mode(dev, FM3130_MODE_WRITE);
186
187 /* Writing time registers, we don't support multibyte transfers */
188 for (i = 0; i < FM3130_CLOCK_REGS; i++) {
189 i2c_smbus_write_byte_data(fm3130->client,
190 FM3130_RTC_SECONDS + i,
191 fm3130->regs[FM3130_RTC_SECONDS + i]);
192 }
193
194 fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
195
196 /* We assume here that data are valid once written */
197 if (!fm3130->data_valid)
198 fm3130->data_valid = 1;
199 return 0;
200}
201
202static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
203{
204 struct fm3130 *fm3130 = dev_get_drvdata(dev);
205 int tmp;
206 struct rtc_time *tm = &alrm->time;
207
208 if (!fm3130->alarm_valid) {
209 /*
210 * We have invalid alarm in RTC, probably due to battery faults
211 * or other problems. Return EIO for now, it will allow us to
212 * set alarm value later instead of error during probing which
213 * disables device
214 */
215 return -EIO;
216 }
217
218 /* read the RTC alarm registers all at once */
219 tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
220 &fm3130->msg[2], 2);
221 if (tmp != 2) {
222 dev_err(dev, "%s error %d\n", "read", tmp);
223 return -EIO;
224 }
225 dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
226 fm3130->regs[FM3130_ALARM_SECONDS],
227 fm3130->regs[FM3130_ALARM_MINUTES],
228 fm3130->regs[FM3130_ALARM_HOURS],
229 fm3130->regs[FM3130_ALARM_DATE],
230 fm3130->regs[FM3130_ALARM_MONTHS]);
231
232 tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
233 tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
234 tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
235 tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
236 tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
237
238 if (tm->tm_mon > 0)
239 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
240
241 dev_dbg(dev, "%s secs=%d, mins=%d, "
242 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
243 "read alarm", tm->tm_sec, tm->tm_min,
244 tm->tm_hour, tm->tm_mday,
245 tm->tm_mon, tm->tm_year, tm->tm_wday);
246
247 /* check if alarm enabled */
248 fm3130->regs[FM3130_RTC_CONTROL] =
249 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
250
251 if ((fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AEN) &&
252 (~fm3130->regs[FM3130_RTC_CONTROL] &
253 FM3130_RTC_CONTROL_BIT_CAL)) {
254 alrm->enabled = 1;
255 }
256
257 return 0;
258}
259
260static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
261{
262 struct fm3130 *fm3130 = dev_get_drvdata(dev);
263 struct rtc_time *tm = &alrm->time;
264 int i;
265
266 dev_dbg(dev, "%s secs=%d, mins=%d, "
267 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
268 "write alarm", tm->tm_sec, tm->tm_min,
269 tm->tm_hour, tm->tm_mday,
270 tm->tm_mon, tm->tm_year, tm->tm_wday);
271
272 fm3130->regs[FM3130_ALARM_SECONDS] =
273 (tm->tm_sec != -1) ? bin2bcd(tm->tm_sec) : 0x80;
274
275 fm3130->regs[FM3130_ALARM_MINUTES] =
276 (tm->tm_min != -1) ? bin2bcd(tm->tm_min) : 0x80;
277
278 fm3130->regs[FM3130_ALARM_HOURS] =
279 (tm->tm_hour != -1) ? bin2bcd(tm->tm_hour) : 0x80;
280
281 fm3130->regs[FM3130_ALARM_DATE] =
282 (tm->tm_mday != -1) ? bin2bcd(tm->tm_mday) : 0x80;
283
284 fm3130->regs[FM3130_ALARM_MONTHS] =
285 (tm->tm_mon != -1) ? bin2bcd(tm->tm_mon + 1) : 0x80;
286
287 dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
288 fm3130->regs[FM3130_ALARM_SECONDS],
289 fm3130->regs[FM3130_ALARM_MINUTES],
290 fm3130->regs[FM3130_ALARM_HOURS],
291 fm3130->regs[FM3130_ALARM_DATE],
292 fm3130->regs[FM3130_ALARM_MONTHS]);
293 /* Writing time registers, we don't support multibyte transfers */
294 for (i = 0; i < FM3130_ALARM_REGS; i++) {
295 i2c_smbus_write_byte_data(fm3130->client,
296 FM3130_ALARM_SECONDS + i,
297 fm3130->regs[FM3130_ALARM_SECONDS + i]);
298 }
299 fm3130->regs[FM3130_RTC_CONTROL] =
300 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
301
302 /* enable or disable alarm */
303 if (alrm->enabled) {
304 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
305 (fm3130->regs[FM3130_RTC_CONTROL] &
306 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
307 FM3130_RTC_CONTROL_BIT_AEN);
308 } else {
309 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
310 fm3130->regs[FM3130_RTC_CONTROL] &
311 ~(FM3130_RTC_CONTROL_BIT_CAL) &
312 ~(FM3130_RTC_CONTROL_BIT_AEN));
313 }
314
315 /* We assume here that data is valid once written */
316 if (!fm3130->alarm_valid)
317 fm3130->alarm_valid = 1;
318
319 return 0;
320}
321
322static int fm3130_alarm_irq_enable(struct device *dev, unsigned int enabled)
323{
324 struct fm3130 *fm3130 = dev_get_drvdata(dev);
325 int ret = 0;
326
327 fm3130->regs[FM3130_RTC_CONTROL] =
328 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
329
330 dev_dbg(dev, "alarm_irq_enable: enable=%d, FM3130_RTC_CONTROL=%02x\n",
331 enabled, fm3130->regs[FM3130_RTC_CONTROL]);
332
333 switch (enabled) {
334 case 0: /* alarm off */
335 ret = i2c_smbus_write_byte_data(fm3130->client,
336 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL] &
337 ~(FM3130_RTC_CONTROL_BIT_CAL) &
338 ~(FM3130_RTC_CONTROL_BIT_AEN));
339 break;
340 case 1: /* alarm on */
341 ret = i2c_smbus_write_byte_data(fm3130->client,
342 FM3130_RTC_CONTROL, (fm3130->regs[FM3130_RTC_CONTROL] &
343 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
344 FM3130_RTC_CONTROL_BIT_AEN);
345 break;
346 default:
347 ret = -EINVAL;
348 break;
349 }
350
351 return ret;
352}
353
354static const struct rtc_class_ops fm3130_rtc_ops = {
355 .read_time = fm3130_get_time,
356 .set_time = fm3130_set_time,
357 .read_alarm = fm3130_read_alarm,
358 .set_alarm = fm3130_set_alarm,
359 .alarm_irq_enable = fm3130_alarm_irq_enable,
360};
361
362static struct i2c_driver fm3130_driver;
363
364static int __devinit fm3130_probe(struct i2c_client *client,
365 const struct i2c_device_id *id)
366{
367 struct fm3130 *fm3130;
368 int err = -ENODEV;
369 int tmp;
370 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
371
372 if (!i2c_check_functionality(adapter,
373 I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
374 return -EIO;
375
376 fm3130 = kzalloc(sizeof(struct fm3130), GFP_KERNEL);
377
378 if (!fm3130)
379 return -ENOMEM;
380
381 fm3130->client = client;
382 i2c_set_clientdata(client, fm3130);
383 fm3130->reg_addr_time = FM3130_RTC_SECONDS;
384 fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;
385
386 /* Messages to read time */
387 fm3130->msg[0].addr = client->addr;
388 fm3130->msg[0].flags = 0;
389 fm3130->msg[0].len = 1;
390 fm3130->msg[0].buf = &fm3130->reg_addr_time;
391
392 fm3130->msg[1].addr = client->addr;
393 fm3130->msg[1].flags = I2C_M_RD;
394 fm3130->msg[1].len = FM3130_CLOCK_REGS;
395 fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];
396
397 /* Messages to read alarm */
398 fm3130->msg[2].addr = client->addr;
399 fm3130->msg[2].flags = 0;
400 fm3130->msg[2].len = 1;
401 fm3130->msg[2].buf = &fm3130->reg_addr_alarm;
402
403 fm3130->msg[3].addr = client->addr;
404 fm3130->msg[3].flags = I2C_M_RD;
405 fm3130->msg[3].len = FM3130_ALARM_REGS;
406 fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];
407
408 fm3130->alarm_valid = 0;
409 fm3130->data_valid = 0;
410
411 tmp = i2c_transfer(adapter, fm3130->msg, 4);
412 if (tmp != 4) {
413 pr_debug("read error %d\n", tmp);
414 err = -EIO;
415 goto exit_free;
416 }
417
418 fm3130->regs[FM3130_RTC_CONTROL] =
419 i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
420 fm3130->regs[FM3130_CAL_CONTROL] =
421 i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);
422
423 /* Disabling calibration mode */
424 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) {
425 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
426 fm3130->regs[FM3130_RTC_CONTROL] &
427 ~(FM3130_RTC_CONTROL_BIT_CAL));
428 dev_warn(&client->dev, "Disabling calibration mode!\n");
429 }
430
431 /* Disabling read and write modes */
432 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
433 fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) {
434 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
435 fm3130->regs[FM3130_RTC_CONTROL] &
436 ~(FM3130_RTC_CONTROL_BIT_READ |
437 FM3130_RTC_CONTROL_BIT_WRITE));
438 dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");
439 }
440
441 /* oscillator off? turn it on, so clock can tick. */
442 if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
443 i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
444 fm3130->regs[FM3130_CAL_CONTROL] &
445 ~(FM3130_CAL_CONTROL_BIT_nOSCEN));
446
447 /* low battery? clear flag, and warn */
448 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
449 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
450 fm3130->regs[FM3130_RTC_CONTROL] &
451 ~(FM3130_RTC_CONTROL_BIT_LB));
452 dev_warn(&client->dev, "Low battery!\n");
453 }
454
455 /* check if Power On Reset bit is set */
456 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
457 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
458 fm3130->regs[FM3130_RTC_CONTROL] &
459 ~FM3130_RTC_CONTROL_BIT_POR);
460 dev_dbg(&client->dev, "POR bit is set\n");
461 }
462 /* ACS is controlled by alarm */
463 i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
464
465 /* alarm registers sanity check */
466 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
467 if (tmp > 59)
468 goto bad_alarm;
469
470 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
471 if (tmp > 59)
472 goto bad_alarm;
473
474 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
475 if (tmp > 23)
476 goto bad_alarm;
477
478 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
479 if (tmp == 0 || tmp > 31)
480 goto bad_alarm;
481
482 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
483 if (tmp == 0 || tmp > 12)
484 goto bad_alarm;
485
486 fm3130->alarm_valid = 1;
487
488bad_alarm:
489
490 /* clock registers sanity chek */
491 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
492 if (tmp > 59)
493 goto bad_clock;
494
495 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
496 if (tmp > 59)
497 goto bad_clock;
498
499 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
500 if (tmp > 23)
501 goto bad_clock;
502
503 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
504 if (tmp == 0 || tmp > 7)
505 goto bad_clock;
506
507 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
508 if (tmp == 0 || tmp > 31)
509 goto bad_clock;
510
511 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
512 if (tmp == 0 || tmp > 12)
513 goto bad_clock;
514
515 fm3130->data_valid = 1;
516
517bad_clock:
518
519 if (!fm3130->data_valid || !fm3130->alarm_valid)
520 dev_dbg(&client->dev,
521 "%s: %02x %02x %02x %02x %02x %02x %02x %02x"
522 "%02x %02x %02x %02x %02x %02x %02x\n",
523 "bogus registers",
524 fm3130->regs[0], fm3130->regs[1],
525 fm3130->regs[2], fm3130->regs[3],
526 fm3130->regs[4], fm3130->regs[5],
527 fm3130->regs[6], fm3130->regs[7],
528 fm3130->regs[8], fm3130->regs[9],
529 fm3130->regs[0xa], fm3130->regs[0xb],
530 fm3130->regs[0xc], fm3130->regs[0xd],
531 fm3130->regs[0xe]);
532
533 /* We won't bail out here because we just got invalid data.
534 Time setting from u-boot doesn't work anyway */
535 fm3130->rtc = rtc_device_register(client->name, &client->dev,
536 &fm3130_rtc_ops, THIS_MODULE);
537 if (IS_ERR(fm3130->rtc)) {
538 err = PTR_ERR(fm3130->rtc);
539 dev_err(&client->dev,
540 "unable to register the class device\n");
541 goto exit_free;
542 }
543 return 0;
544exit_free:
545 kfree(fm3130);
546 return err;
547}
548
549static int __devexit fm3130_remove(struct i2c_client *client)
550{
551 struct fm3130 *fm3130 = i2c_get_clientdata(client);
552
553 rtc_device_unregister(fm3130->rtc);
554 kfree(fm3130);
555 return 0;
556}
557
558static struct i2c_driver fm3130_driver = {
559 .driver = {
560 .name = "rtc-fm3130",
561 .owner = THIS_MODULE,
562 },
563 .probe = fm3130_probe,
564 .remove = __devexit_p(fm3130_remove),
565 .id_table = fm3130_id,
566};
567
568module_i2c_driver(fm3130_driver);
569
570MODULE_DESCRIPTION("RTC driver for FM3130");
571MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
572MODULE_LICENSE("GPL");
573
1/*
2 * rtc-fm3130.c - RTC driver for Ramtron FM3130 I2C chip.
3 *
4 * Copyright (C) 2008 Sergey Lapin
5 * Based on ds1307 driver by James Chapman and David Brownell
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/i2c.h>
14#include <linux/rtc.h>
15#include <linux/bcd.h>
16#include <linux/slab.h>
17
18#define FM3130_RTC_CONTROL (0x0)
19#define FM3130_CAL_CONTROL (0x1)
20#define FM3130_RTC_SECONDS (0x2)
21#define FM3130_RTC_MINUTES (0x3)
22#define FM3130_RTC_HOURS (0x4)
23#define FM3130_RTC_DAY (0x5)
24#define FM3130_RTC_DATE (0x6)
25#define FM3130_RTC_MONTHS (0x7)
26#define FM3130_RTC_YEARS (0x8)
27
28#define FM3130_ALARM_SECONDS (0x9)
29#define FM3130_ALARM_MINUTES (0xa)
30#define FM3130_ALARM_HOURS (0xb)
31#define FM3130_ALARM_DATE (0xc)
32#define FM3130_ALARM_MONTHS (0xd)
33#define FM3130_ALARM_WP_CONTROL (0xe)
34
35#define FM3130_CAL_CONTROL_BIT_nOSCEN (1 << 7) /* Osciallator enabled */
36#define FM3130_RTC_CONTROL_BIT_LB (1 << 7) /* Low battery */
37#define FM3130_RTC_CONTROL_BIT_AF (1 << 6) /* Alarm flag */
38#define FM3130_RTC_CONTROL_BIT_CF (1 << 5) /* Century overflow */
39#define FM3130_RTC_CONTROL_BIT_POR (1 << 4) /* Power on reset */
40#define FM3130_RTC_CONTROL_BIT_AEN (1 << 3) /* Alarm enable */
41#define FM3130_RTC_CONTROL_BIT_CAL (1 << 2) /* Calibration mode */
42#define FM3130_RTC_CONTROL_BIT_WRITE (1 << 1) /* W=1 -> write mode W=0 normal */
43#define FM3130_RTC_CONTROL_BIT_READ (1 << 0) /* R=1 -> read mode R=0 normal */
44
45#define FM3130_CLOCK_REGS 7
46#define FM3130_ALARM_REGS 5
47
48struct fm3130 {
49 u8 reg_addr_time;
50 u8 reg_addr_alarm;
51 u8 regs[15];
52 struct i2c_msg msg[4];
53 struct i2c_client *client;
54 struct rtc_device *rtc;
55 int alarm_valid;
56 int data_valid;
57};
58static const struct i2c_device_id fm3130_id[] = {
59 { "fm3130", 0 },
60 { }
61};
62MODULE_DEVICE_TABLE(i2c, fm3130_id);
63
64#define FM3130_MODE_NORMAL 0
65#define FM3130_MODE_WRITE 1
66#define FM3130_MODE_READ 2
67
68static void fm3130_rtc_mode(struct device *dev, int mode)
69{
70 struct fm3130 *fm3130 = dev_get_drvdata(dev);
71
72 fm3130->regs[FM3130_RTC_CONTROL] =
73 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
74 switch (mode) {
75 case FM3130_MODE_NORMAL:
76 fm3130->regs[FM3130_RTC_CONTROL] &=
77 ~(FM3130_RTC_CONTROL_BIT_WRITE |
78 FM3130_RTC_CONTROL_BIT_READ);
79 break;
80 case FM3130_MODE_WRITE:
81 fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_WRITE;
82 break;
83 case FM3130_MODE_READ:
84 fm3130->regs[FM3130_RTC_CONTROL] |= FM3130_RTC_CONTROL_BIT_READ;
85 break;
86 default:
87 dev_dbg(dev, "invalid mode %d\n", mode);
88 break;
89 }
90
91 i2c_smbus_write_byte_data(fm3130->client,
92 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL]);
93}
94
95static int fm3130_get_time(struct device *dev, struct rtc_time *t)
96{
97 struct fm3130 *fm3130 = dev_get_drvdata(dev);
98 int tmp;
99
100 if (!fm3130->data_valid) {
101 /* We have invalid data in RTC, probably due
102 to battery faults or other problems. Return EIO
103 for now, it will allow us to set data later instead
104 of error during probing which disables device */
105 return -EIO;
106 }
107 fm3130_rtc_mode(dev, FM3130_MODE_READ);
108
109 /* read the RTC date and time registers all at once */
110 tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
111 fm3130->msg, 2);
112 if (tmp != 2) {
113 dev_err(dev, "%s error %d\n", "read", tmp);
114 return -EIO;
115 }
116
117 fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
118
119 dev_dbg(dev, "%s: %15ph\n", "read", fm3130->regs);
120
121 t->tm_sec = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
122 t->tm_min = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
123 tmp = fm3130->regs[FM3130_RTC_HOURS] & 0x3f;
124 t->tm_hour = bcd2bin(tmp);
125 t->tm_wday = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x07) - 1;
126 t->tm_mday = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
127 tmp = fm3130->regs[FM3130_RTC_MONTHS] & 0x1f;
128 t->tm_mon = bcd2bin(tmp) - 1;
129
130 /* assume 20YY not 19YY, and ignore CF bit */
131 t->tm_year = bcd2bin(fm3130->regs[FM3130_RTC_YEARS]) + 100;
132
133 dev_dbg(dev, "%s secs=%d, mins=%d, "
134 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
135 "read", t->tm_sec, t->tm_min,
136 t->tm_hour, t->tm_mday,
137 t->tm_mon, t->tm_year, t->tm_wday);
138
139 /* initial clock setting can be undefined */
140 return rtc_valid_tm(t);
141}
142
143
144static int fm3130_set_time(struct device *dev, struct rtc_time *t)
145{
146 struct fm3130 *fm3130 = dev_get_drvdata(dev);
147 int tmp, i;
148 u8 *buf = fm3130->regs;
149
150 dev_dbg(dev, "%s secs=%d, mins=%d, "
151 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
152 "write", t->tm_sec, t->tm_min,
153 t->tm_hour, t->tm_mday,
154 t->tm_mon, t->tm_year, t->tm_wday);
155
156 /* first register addr */
157 buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec);
158 buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min);
159 buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour);
160 buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1);
161 buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday);
162 buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1);
163
164 /* assume 20YY not 19YY */
165 tmp = t->tm_year - 100;
166 buf[FM3130_RTC_YEARS] = bin2bcd(tmp);
167
168 dev_dbg(dev, "%s: %15ph\n", "write", buf);
169
170 fm3130_rtc_mode(dev, FM3130_MODE_WRITE);
171
172 /* Writing time registers, we don't support multibyte transfers */
173 for (i = 0; i < FM3130_CLOCK_REGS; i++) {
174 i2c_smbus_write_byte_data(fm3130->client,
175 FM3130_RTC_SECONDS + i,
176 fm3130->regs[FM3130_RTC_SECONDS + i]);
177 }
178
179 fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
180
181 /* We assume here that data are valid once written */
182 if (!fm3130->data_valid)
183 fm3130->data_valid = 1;
184 return 0;
185}
186
187static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
188{
189 struct fm3130 *fm3130 = dev_get_drvdata(dev);
190 int tmp;
191 struct rtc_time *tm = &alrm->time;
192
193 if (!fm3130->alarm_valid) {
194 /*
195 * We have invalid alarm in RTC, probably due to battery faults
196 * or other problems. Return EIO for now, it will allow us to
197 * set alarm value later instead of error during probing which
198 * disables device
199 */
200 return -EIO;
201 }
202
203 /* read the RTC alarm registers all at once */
204 tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
205 &fm3130->msg[2], 2);
206 if (tmp != 2) {
207 dev_err(dev, "%s error %d\n", "read", tmp);
208 return -EIO;
209 }
210 dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
211 fm3130->regs[FM3130_ALARM_SECONDS],
212 fm3130->regs[FM3130_ALARM_MINUTES],
213 fm3130->regs[FM3130_ALARM_HOURS],
214 fm3130->regs[FM3130_ALARM_DATE],
215 fm3130->regs[FM3130_ALARM_MONTHS]);
216
217 tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
218 tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
219 tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
220 tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
221 tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
222
223 if (tm->tm_mon > 0)
224 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
225
226 dev_dbg(dev, "%s secs=%d, mins=%d, "
227 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
228 "read alarm", tm->tm_sec, tm->tm_min,
229 tm->tm_hour, tm->tm_mday,
230 tm->tm_mon, tm->tm_year, tm->tm_wday);
231
232 /* check if alarm enabled */
233 fm3130->regs[FM3130_RTC_CONTROL] =
234 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
235
236 if ((fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AEN) &&
237 (~fm3130->regs[FM3130_RTC_CONTROL] &
238 FM3130_RTC_CONTROL_BIT_CAL)) {
239 alrm->enabled = 1;
240 }
241
242 return 0;
243}
244
245static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
246{
247 struct fm3130 *fm3130 = dev_get_drvdata(dev);
248 struct rtc_time *tm = &alrm->time;
249 int i;
250
251 dev_dbg(dev, "%s secs=%d, mins=%d, "
252 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
253 "write alarm", tm->tm_sec, tm->tm_min,
254 tm->tm_hour, tm->tm_mday,
255 tm->tm_mon, tm->tm_year, tm->tm_wday);
256
257 fm3130->regs[FM3130_ALARM_SECONDS] =
258 (tm->tm_sec != -1) ? bin2bcd(tm->tm_sec) : 0x80;
259
260 fm3130->regs[FM3130_ALARM_MINUTES] =
261 (tm->tm_min != -1) ? bin2bcd(tm->tm_min) : 0x80;
262
263 fm3130->regs[FM3130_ALARM_HOURS] =
264 (tm->tm_hour != -1) ? bin2bcd(tm->tm_hour) : 0x80;
265
266 fm3130->regs[FM3130_ALARM_DATE] =
267 (tm->tm_mday != -1) ? bin2bcd(tm->tm_mday) : 0x80;
268
269 fm3130->regs[FM3130_ALARM_MONTHS] =
270 (tm->tm_mon != -1) ? bin2bcd(tm->tm_mon + 1) : 0x80;
271
272 dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
273 fm3130->regs[FM3130_ALARM_SECONDS],
274 fm3130->regs[FM3130_ALARM_MINUTES],
275 fm3130->regs[FM3130_ALARM_HOURS],
276 fm3130->regs[FM3130_ALARM_DATE],
277 fm3130->regs[FM3130_ALARM_MONTHS]);
278 /* Writing time registers, we don't support multibyte transfers */
279 for (i = 0; i < FM3130_ALARM_REGS; i++) {
280 i2c_smbus_write_byte_data(fm3130->client,
281 FM3130_ALARM_SECONDS + i,
282 fm3130->regs[FM3130_ALARM_SECONDS + i]);
283 }
284 fm3130->regs[FM3130_RTC_CONTROL] =
285 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
286
287 /* enable or disable alarm */
288 if (alrm->enabled) {
289 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
290 (fm3130->regs[FM3130_RTC_CONTROL] &
291 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
292 FM3130_RTC_CONTROL_BIT_AEN);
293 } else {
294 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
295 fm3130->regs[FM3130_RTC_CONTROL] &
296 ~(FM3130_RTC_CONTROL_BIT_CAL) &
297 ~(FM3130_RTC_CONTROL_BIT_AEN));
298 }
299
300 /* We assume here that data is valid once written */
301 if (!fm3130->alarm_valid)
302 fm3130->alarm_valid = 1;
303
304 return 0;
305}
306
307static int fm3130_alarm_irq_enable(struct device *dev, unsigned int enabled)
308{
309 struct fm3130 *fm3130 = dev_get_drvdata(dev);
310 int ret = 0;
311
312 fm3130->regs[FM3130_RTC_CONTROL] =
313 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
314
315 dev_dbg(dev, "alarm_irq_enable: enable=%d, FM3130_RTC_CONTROL=%02x\n",
316 enabled, fm3130->regs[FM3130_RTC_CONTROL]);
317
318 switch (enabled) {
319 case 0: /* alarm off */
320 ret = i2c_smbus_write_byte_data(fm3130->client,
321 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL] &
322 ~(FM3130_RTC_CONTROL_BIT_CAL) &
323 ~(FM3130_RTC_CONTROL_BIT_AEN));
324 break;
325 case 1: /* alarm on */
326 ret = i2c_smbus_write_byte_data(fm3130->client,
327 FM3130_RTC_CONTROL, (fm3130->regs[FM3130_RTC_CONTROL] &
328 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
329 FM3130_RTC_CONTROL_BIT_AEN);
330 break;
331 default:
332 ret = -EINVAL;
333 break;
334 }
335
336 return ret;
337}
338
339static const struct rtc_class_ops fm3130_rtc_ops = {
340 .read_time = fm3130_get_time,
341 .set_time = fm3130_set_time,
342 .read_alarm = fm3130_read_alarm,
343 .set_alarm = fm3130_set_alarm,
344 .alarm_irq_enable = fm3130_alarm_irq_enable,
345};
346
347static struct i2c_driver fm3130_driver;
348
349static int fm3130_probe(struct i2c_client *client,
350 const struct i2c_device_id *id)
351{
352 struct fm3130 *fm3130;
353 int err = -ENODEV;
354 int tmp;
355 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
356
357 if (!i2c_check_functionality(adapter,
358 I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
359 return -EIO;
360
361 fm3130 = devm_kzalloc(&client->dev, sizeof(struct fm3130), GFP_KERNEL);
362
363 if (!fm3130)
364 return -ENOMEM;
365
366 fm3130->client = client;
367 i2c_set_clientdata(client, fm3130);
368 fm3130->reg_addr_time = FM3130_RTC_SECONDS;
369 fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;
370
371 /* Messages to read time */
372 fm3130->msg[0].addr = client->addr;
373 fm3130->msg[0].flags = 0;
374 fm3130->msg[0].len = 1;
375 fm3130->msg[0].buf = &fm3130->reg_addr_time;
376
377 fm3130->msg[1].addr = client->addr;
378 fm3130->msg[1].flags = I2C_M_RD;
379 fm3130->msg[1].len = FM3130_CLOCK_REGS;
380 fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];
381
382 /* Messages to read alarm */
383 fm3130->msg[2].addr = client->addr;
384 fm3130->msg[2].flags = 0;
385 fm3130->msg[2].len = 1;
386 fm3130->msg[2].buf = &fm3130->reg_addr_alarm;
387
388 fm3130->msg[3].addr = client->addr;
389 fm3130->msg[3].flags = I2C_M_RD;
390 fm3130->msg[3].len = FM3130_ALARM_REGS;
391 fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];
392
393 fm3130->alarm_valid = 0;
394 fm3130->data_valid = 0;
395
396 tmp = i2c_transfer(adapter, fm3130->msg, 4);
397 if (tmp != 4) {
398 dev_dbg(&client->dev, "read error %d\n", tmp);
399 err = -EIO;
400 goto exit_free;
401 }
402
403 fm3130->regs[FM3130_RTC_CONTROL] =
404 i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
405 fm3130->regs[FM3130_CAL_CONTROL] =
406 i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);
407
408 /* Disabling calibration mode */
409 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) {
410 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
411 fm3130->regs[FM3130_RTC_CONTROL] &
412 ~(FM3130_RTC_CONTROL_BIT_CAL));
413 dev_warn(&client->dev, "Disabling calibration mode!\n");
414 }
415
416 /* Disabling read and write modes */
417 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
418 fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) {
419 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
420 fm3130->regs[FM3130_RTC_CONTROL] &
421 ~(FM3130_RTC_CONTROL_BIT_READ |
422 FM3130_RTC_CONTROL_BIT_WRITE));
423 dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");
424 }
425
426 /* oscillator off? turn it on, so clock can tick. */
427 if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
428 i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
429 fm3130->regs[FM3130_CAL_CONTROL] &
430 ~(FM3130_CAL_CONTROL_BIT_nOSCEN));
431
432 /* low battery? clear flag, and warn */
433 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
434 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
435 fm3130->regs[FM3130_RTC_CONTROL] &
436 ~(FM3130_RTC_CONTROL_BIT_LB));
437 dev_warn(&client->dev, "Low battery!\n");
438 }
439
440 /* check if Power On Reset bit is set */
441 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
442 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
443 fm3130->regs[FM3130_RTC_CONTROL] &
444 ~FM3130_RTC_CONTROL_BIT_POR);
445 dev_dbg(&client->dev, "POR bit is set\n");
446 }
447 /* ACS is controlled by alarm */
448 i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
449
450 /* alarm registers sanity check */
451 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
452 if (tmp > 59)
453 goto bad_alarm;
454
455 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
456 if (tmp > 59)
457 goto bad_alarm;
458
459 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
460 if (tmp > 23)
461 goto bad_alarm;
462
463 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
464 if (tmp == 0 || tmp > 31)
465 goto bad_alarm;
466
467 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
468 if (tmp == 0 || tmp > 12)
469 goto bad_alarm;
470
471 fm3130->alarm_valid = 1;
472
473bad_alarm:
474
475 /* clock registers sanity chek */
476 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
477 if (tmp > 59)
478 goto bad_clock;
479
480 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
481 if (tmp > 59)
482 goto bad_clock;
483
484 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
485 if (tmp > 23)
486 goto bad_clock;
487
488 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
489 if (tmp == 0 || tmp > 7)
490 goto bad_clock;
491
492 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
493 if (tmp == 0 || tmp > 31)
494 goto bad_clock;
495
496 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
497 if (tmp == 0 || tmp > 12)
498 goto bad_clock;
499
500 fm3130->data_valid = 1;
501
502bad_clock:
503
504 if (!fm3130->data_valid || !fm3130->alarm_valid)
505 dev_dbg(&client->dev, "%s: %15ph\n", "bogus registers",
506 fm3130->regs);
507
508 /* We won't bail out here because we just got invalid data.
509 Time setting from u-boot doesn't work anyway */
510 fm3130->rtc = devm_rtc_device_register(&client->dev, client->name,
511 &fm3130_rtc_ops, THIS_MODULE);
512 if (IS_ERR(fm3130->rtc)) {
513 err = PTR_ERR(fm3130->rtc);
514 dev_err(&client->dev,
515 "unable to register the class device\n");
516 goto exit_free;
517 }
518 return 0;
519exit_free:
520 return err;
521}
522
523static struct i2c_driver fm3130_driver = {
524 .driver = {
525 .name = "rtc-fm3130",
526 .owner = THIS_MODULE,
527 },
528 .probe = fm3130_probe,
529 .id_table = fm3130_id,
530};
531
532module_i2c_driver(fm3130_driver);
533
534MODULE_DESCRIPTION("RTC driver for FM3130");
535MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
536MODULE_LICENSE("GPL");
537