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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 return 0;
140}
141
142
143static int fm3130_set_time(struct device *dev, struct rtc_time *t)
144{
145 struct fm3130 *fm3130 = dev_get_drvdata(dev);
146 int tmp, i;
147 u8 *buf = fm3130->regs;
148
149 dev_dbg(dev, "%s secs=%d, mins=%d, "
150 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
151 "write", t->tm_sec, t->tm_min,
152 t->tm_hour, t->tm_mday,
153 t->tm_mon, t->tm_year, t->tm_wday);
154
155 /* first register addr */
156 buf[FM3130_RTC_SECONDS] = bin2bcd(t->tm_sec);
157 buf[FM3130_RTC_MINUTES] = bin2bcd(t->tm_min);
158 buf[FM3130_RTC_HOURS] = bin2bcd(t->tm_hour);
159 buf[FM3130_RTC_DAY] = bin2bcd(t->tm_wday + 1);
160 buf[FM3130_RTC_DATE] = bin2bcd(t->tm_mday);
161 buf[FM3130_RTC_MONTHS] = bin2bcd(t->tm_mon + 1);
162
163 /* assume 20YY not 19YY */
164 tmp = t->tm_year - 100;
165 buf[FM3130_RTC_YEARS] = bin2bcd(tmp);
166
167 dev_dbg(dev, "%s: %15ph\n", "write", buf);
168
169 fm3130_rtc_mode(dev, FM3130_MODE_WRITE);
170
171 /* Writing time registers, we don't support multibyte transfers */
172 for (i = 0; i < FM3130_CLOCK_REGS; i++) {
173 i2c_smbus_write_byte_data(fm3130->client,
174 FM3130_RTC_SECONDS + i,
175 fm3130->regs[FM3130_RTC_SECONDS + i]);
176 }
177
178 fm3130_rtc_mode(dev, FM3130_MODE_NORMAL);
179
180 /* We assume here that data are valid once written */
181 if (!fm3130->data_valid)
182 fm3130->data_valid = 1;
183 return 0;
184}
185
186static int fm3130_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
187{
188 struct fm3130 *fm3130 = dev_get_drvdata(dev);
189 int tmp;
190 struct rtc_time *tm = &alrm->time;
191
192 if (!fm3130->alarm_valid) {
193 /*
194 * We have invalid alarm in RTC, probably due to battery faults
195 * or other problems. Return EIO for now, it will allow us to
196 * set alarm value later instead of error during probing which
197 * disables device
198 */
199 return -EIO;
200 }
201
202 /* read the RTC alarm registers all at once */
203 tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
204 &fm3130->msg[2], 2);
205 if (tmp != 2) {
206 dev_err(dev, "%s error %d\n", "read", tmp);
207 return -EIO;
208 }
209 dev_dbg(dev, "alarm read %02x %02x %02x %02x %02x\n",
210 fm3130->regs[FM3130_ALARM_SECONDS],
211 fm3130->regs[FM3130_ALARM_MINUTES],
212 fm3130->regs[FM3130_ALARM_HOURS],
213 fm3130->regs[FM3130_ALARM_DATE],
214 fm3130->regs[FM3130_ALARM_MONTHS]);
215
216 tm->tm_sec = bcd2bin(fm3130->regs[FM3130_ALARM_SECONDS] & 0x7F);
217 tm->tm_min = bcd2bin(fm3130->regs[FM3130_ALARM_MINUTES] & 0x7F);
218 tm->tm_hour = bcd2bin(fm3130->regs[FM3130_ALARM_HOURS] & 0x3F);
219 tm->tm_mday = bcd2bin(fm3130->regs[FM3130_ALARM_DATE] & 0x3F);
220 tm->tm_mon = bcd2bin(fm3130->regs[FM3130_ALARM_MONTHS] & 0x1F);
221
222 if (tm->tm_mon > 0)
223 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */
224
225 dev_dbg(dev, "%s secs=%d, mins=%d, "
226 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
227 "read alarm", tm->tm_sec, tm->tm_min,
228 tm->tm_hour, tm->tm_mday,
229 tm->tm_mon, tm->tm_year, tm->tm_wday);
230
231 /* check if alarm enabled */
232 fm3130->regs[FM3130_RTC_CONTROL] =
233 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
234
235 if ((fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_AEN) &&
236 (~fm3130->regs[FM3130_RTC_CONTROL] &
237 FM3130_RTC_CONTROL_BIT_CAL)) {
238 alrm->enabled = 1;
239 }
240
241 return 0;
242}
243
244static int fm3130_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
245{
246 struct fm3130 *fm3130 = dev_get_drvdata(dev);
247 struct rtc_time *tm = &alrm->time;
248 int i;
249
250 dev_dbg(dev, "%s secs=%d, mins=%d, "
251 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
252 "write alarm", tm->tm_sec, tm->tm_min,
253 tm->tm_hour, tm->tm_mday,
254 tm->tm_mon, tm->tm_year, tm->tm_wday);
255
256 fm3130->regs[FM3130_ALARM_SECONDS] =
257 (tm->tm_sec != -1) ? bin2bcd(tm->tm_sec) : 0x80;
258
259 fm3130->regs[FM3130_ALARM_MINUTES] =
260 (tm->tm_min != -1) ? bin2bcd(tm->tm_min) : 0x80;
261
262 fm3130->regs[FM3130_ALARM_HOURS] =
263 (tm->tm_hour != -1) ? bin2bcd(tm->tm_hour) : 0x80;
264
265 fm3130->regs[FM3130_ALARM_DATE] =
266 (tm->tm_mday != -1) ? bin2bcd(tm->tm_mday) : 0x80;
267
268 fm3130->regs[FM3130_ALARM_MONTHS] =
269 (tm->tm_mon != -1) ? bin2bcd(tm->tm_mon + 1) : 0x80;
270
271 dev_dbg(dev, "alarm write %02x %02x %02x %02x %02x\n",
272 fm3130->regs[FM3130_ALARM_SECONDS],
273 fm3130->regs[FM3130_ALARM_MINUTES],
274 fm3130->regs[FM3130_ALARM_HOURS],
275 fm3130->regs[FM3130_ALARM_DATE],
276 fm3130->regs[FM3130_ALARM_MONTHS]);
277 /* Writing time registers, we don't support multibyte transfers */
278 for (i = 0; i < FM3130_ALARM_REGS; i++) {
279 i2c_smbus_write_byte_data(fm3130->client,
280 FM3130_ALARM_SECONDS + i,
281 fm3130->regs[FM3130_ALARM_SECONDS + i]);
282 }
283 fm3130->regs[FM3130_RTC_CONTROL] =
284 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
285
286 /* enable or disable alarm */
287 if (alrm->enabled) {
288 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
289 (fm3130->regs[FM3130_RTC_CONTROL] &
290 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
291 FM3130_RTC_CONTROL_BIT_AEN);
292 } else {
293 i2c_smbus_write_byte_data(fm3130->client, FM3130_RTC_CONTROL,
294 fm3130->regs[FM3130_RTC_CONTROL] &
295 ~(FM3130_RTC_CONTROL_BIT_CAL) &
296 ~(FM3130_RTC_CONTROL_BIT_AEN));
297 }
298
299 /* We assume here that data is valid once written */
300 if (!fm3130->alarm_valid)
301 fm3130->alarm_valid = 1;
302
303 return 0;
304}
305
306static int fm3130_alarm_irq_enable(struct device *dev, unsigned int enabled)
307{
308 struct fm3130 *fm3130 = dev_get_drvdata(dev);
309 int ret = 0;
310
311 fm3130->regs[FM3130_RTC_CONTROL] =
312 i2c_smbus_read_byte_data(fm3130->client, FM3130_RTC_CONTROL);
313
314 dev_dbg(dev, "alarm_irq_enable: enable=%d, FM3130_RTC_CONTROL=%02x\n",
315 enabled, fm3130->regs[FM3130_RTC_CONTROL]);
316
317 switch (enabled) {
318 case 0: /* alarm off */
319 ret = i2c_smbus_write_byte_data(fm3130->client,
320 FM3130_RTC_CONTROL, fm3130->regs[FM3130_RTC_CONTROL] &
321 ~(FM3130_RTC_CONTROL_BIT_CAL) &
322 ~(FM3130_RTC_CONTROL_BIT_AEN));
323 break;
324 case 1: /* alarm on */
325 ret = i2c_smbus_write_byte_data(fm3130->client,
326 FM3130_RTC_CONTROL, (fm3130->regs[FM3130_RTC_CONTROL] &
327 ~(FM3130_RTC_CONTROL_BIT_CAL)) |
328 FM3130_RTC_CONTROL_BIT_AEN);
329 break;
330 default:
331 ret = -EINVAL;
332 break;
333 }
334
335 return ret;
336}
337
338static const struct rtc_class_ops fm3130_rtc_ops = {
339 .read_time = fm3130_get_time,
340 .set_time = fm3130_set_time,
341 .read_alarm = fm3130_read_alarm,
342 .set_alarm = fm3130_set_alarm,
343 .alarm_irq_enable = fm3130_alarm_irq_enable,
344};
345
346static struct i2c_driver fm3130_driver;
347
348static int fm3130_probe(struct i2c_client *client,
349 const struct i2c_device_id *id)
350{
351 struct fm3130 *fm3130;
352 int err = -ENODEV;
353 int tmp;
354 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
355
356 if (!i2c_check_functionality(adapter,
357 I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
358 return -EIO;
359
360 fm3130 = devm_kzalloc(&client->dev, sizeof(struct fm3130), GFP_KERNEL);
361
362 if (!fm3130)
363 return -ENOMEM;
364
365 fm3130->client = client;
366 i2c_set_clientdata(client, fm3130);
367 fm3130->reg_addr_time = FM3130_RTC_SECONDS;
368 fm3130->reg_addr_alarm = FM3130_ALARM_SECONDS;
369
370 /* Messages to read time */
371 fm3130->msg[0].addr = client->addr;
372 fm3130->msg[0].flags = 0;
373 fm3130->msg[0].len = 1;
374 fm3130->msg[0].buf = &fm3130->reg_addr_time;
375
376 fm3130->msg[1].addr = client->addr;
377 fm3130->msg[1].flags = I2C_M_RD;
378 fm3130->msg[1].len = FM3130_CLOCK_REGS;
379 fm3130->msg[1].buf = &fm3130->regs[FM3130_RTC_SECONDS];
380
381 /* Messages to read alarm */
382 fm3130->msg[2].addr = client->addr;
383 fm3130->msg[2].flags = 0;
384 fm3130->msg[2].len = 1;
385 fm3130->msg[2].buf = &fm3130->reg_addr_alarm;
386
387 fm3130->msg[3].addr = client->addr;
388 fm3130->msg[3].flags = I2C_M_RD;
389 fm3130->msg[3].len = FM3130_ALARM_REGS;
390 fm3130->msg[3].buf = &fm3130->regs[FM3130_ALARM_SECONDS];
391
392 fm3130->alarm_valid = 0;
393 fm3130->data_valid = 0;
394
395 tmp = i2c_transfer(adapter, fm3130->msg, 4);
396 if (tmp != 4) {
397 dev_dbg(&client->dev, "read error %d\n", tmp);
398 err = -EIO;
399 goto exit_free;
400 }
401
402 fm3130->regs[FM3130_RTC_CONTROL] =
403 i2c_smbus_read_byte_data(client, FM3130_RTC_CONTROL);
404 fm3130->regs[FM3130_CAL_CONTROL] =
405 i2c_smbus_read_byte_data(client, FM3130_CAL_CONTROL);
406
407 /* Disabling calibration mode */
408 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_CAL) {
409 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
410 fm3130->regs[FM3130_RTC_CONTROL] &
411 ~(FM3130_RTC_CONTROL_BIT_CAL));
412 dev_warn(&client->dev, "Disabling calibration mode!\n");
413 }
414
415 /* Disabling read and write modes */
416 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_WRITE ||
417 fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_READ) {
418 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
419 fm3130->regs[FM3130_RTC_CONTROL] &
420 ~(FM3130_RTC_CONTROL_BIT_READ |
421 FM3130_RTC_CONTROL_BIT_WRITE));
422 dev_warn(&client->dev, "Disabling READ or WRITE mode!\n");
423 }
424
425 /* oscillator off? turn it on, so clock can tick. */
426 if (fm3130->regs[FM3130_CAL_CONTROL] & FM3130_CAL_CONTROL_BIT_nOSCEN)
427 i2c_smbus_write_byte_data(client, FM3130_CAL_CONTROL,
428 fm3130->regs[FM3130_CAL_CONTROL] &
429 ~(FM3130_CAL_CONTROL_BIT_nOSCEN));
430
431 /* low battery? clear flag, and warn */
432 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_LB) {
433 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
434 fm3130->regs[FM3130_RTC_CONTROL] &
435 ~(FM3130_RTC_CONTROL_BIT_LB));
436 dev_warn(&client->dev, "Low battery!\n");
437 }
438
439 /* check if Power On Reset bit is set */
440 if (fm3130->regs[FM3130_RTC_CONTROL] & FM3130_RTC_CONTROL_BIT_POR) {
441 i2c_smbus_write_byte_data(client, FM3130_RTC_CONTROL,
442 fm3130->regs[FM3130_RTC_CONTROL] &
443 ~FM3130_RTC_CONTROL_BIT_POR);
444 dev_dbg(&client->dev, "POR bit is set\n");
445 }
446 /* ACS is controlled by alarm */
447 i2c_smbus_write_byte_data(client, FM3130_ALARM_WP_CONTROL, 0x80);
448
449 /* alarm registers sanity check */
450 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
451 if (tmp > 59)
452 goto bad_alarm;
453
454 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
455 if (tmp > 59)
456 goto bad_alarm;
457
458 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
459 if (tmp > 23)
460 goto bad_alarm;
461
462 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
463 if (tmp == 0 || tmp > 31)
464 goto bad_alarm;
465
466 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
467 if (tmp == 0 || tmp > 12)
468 goto bad_alarm;
469
470 fm3130->alarm_valid = 1;
471
472bad_alarm:
473
474 /* clock registers sanity chek */
475 tmp = bcd2bin(fm3130->regs[FM3130_RTC_SECONDS] & 0x7f);
476 if (tmp > 59)
477 goto bad_clock;
478
479 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MINUTES] & 0x7f);
480 if (tmp > 59)
481 goto bad_clock;
482
483 tmp = bcd2bin(fm3130->regs[FM3130_RTC_HOURS] & 0x3f);
484 if (tmp > 23)
485 goto bad_clock;
486
487 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DAY] & 0x7);
488 if (tmp == 0 || tmp > 7)
489 goto bad_clock;
490
491 tmp = bcd2bin(fm3130->regs[FM3130_RTC_DATE] & 0x3f);
492 if (tmp == 0 || tmp > 31)
493 goto bad_clock;
494
495 tmp = bcd2bin(fm3130->regs[FM3130_RTC_MONTHS] & 0x1f);
496 if (tmp == 0 || tmp > 12)
497 goto bad_clock;
498
499 fm3130->data_valid = 1;
500
501bad_clock:
502
503 if (!fm3130->data_valid || !fm3130->alarm_valid)
504 dev_dbg(&client->dev, "%s: %15ph\n", "bogus registers",
505 fm3130->regs);
506
507 /* We won't bail out here because we just got invalid data.
508 Time setting from u-boot doesn't work anyway */
509 fm3130->rtc = devm_rtc_device_register(&client->dev, client->name,
510 &fm3130_rtc_ops, THIS_MODULE);
511 if (IS_ERR(fm3130->rtc)) {
512 err = PTR_ERR(fm3130->rtc);
513 dev_err(&client->dev,
514 "unable to register the class device\n");
515 goto exit_free;
516 }
517 return 0;
518exit_free:
519 return err;
520}
521
522static struct i2c_driver fm3130_driver = {
523 .driver = {
524 .name = "rtc-fm3130",
525 },
526 .probe = fm3130_probe,
527 .id_table = fm3130_id,
528};
529
530module_i2c_driver(fm3130_driver);
531
532MODULE_DESCRIPTION("RTC driver for FM3130");
533MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
534MODULE_LICENSE("GPL");
535