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davinci: MityDSP-L138/MityARM-1808 read MAC address from I2C Prom
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / rtc / rtc-fm3130.c
blob4cf2e70c5078a415313799cfec0de806c2766e42
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: %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
154 static 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
202 static 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
260 static 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
322 static 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
354 static 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
362 static struct i2c_driver fm3130_driver;
363
364 static 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
488 bad_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
517 bad_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;
544 exit_free:
545 kfree(fm3130);
546 return err;
547 }
548
549 static 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
558 static 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
568 static int __init fm3130_init(void)
569 {
570 return i2c_add_driver(&fm3130_driver);
571 }
572 module_init(fm3130_init);
573
574 static void __exit fm3130_exit(void)
575 {
576 i2c_del_driver(&fm3130_driver);
577 }
578 module_exit(fm3130_exit);
579
580 MODULE_DESCRIPTION("RTC driver for FM3130");
581 MODULE_AUTHOR("Sergey Lapin <slapin@ossfans.org>");
582 MODULE_LICENSE("GPL");
583
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree