?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.16.11
[linux/fpc-iii.git] / drivers / rtc / rtc-fm3130.c
blob576eadbba296799eca4bc2ad45d13769799a7cf1
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
48 struct 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 };
58 static const struct i2c_device_id fm3130_id[] = {
59 { "fm3130", 0 },
60 { }
61 };
62 MODULE_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
68 static 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
95 static 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
144 static 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
187 static 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
245 static 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
307 static 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
339 static 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
347 static struct i2c_driver fm3130_driver;
348
349 static 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
473 bad_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
502 bad_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;
519 exit_free:
520 return err;
521 }
522
523 static struct i2c_driver fm3130_driver = {
524 .driver = {
525 .name = "rtc-fm3130",
526 },
527 .probe = fm3130_probe,
528 .id_table = fm3130_id,
529 };
530
531 module_i2c_driver(fm3130_driver);
532
533 MODULE_DESCRIPTION("RTC driver for FM3130");
534 MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
535 MODULE_LICENSE("GPL");
536
Linux with added FPC-III support