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Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
[linux-2.6.git] / drivers / rtc / rtc-isl1208.c
blobc016ad81767a9d1be4697c267072a124f4398fc6
1 /*
2 * Intersil ISL1208 rtc class driver
3 *
4 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/i2c.h>
15 #include <linux/bcd.h>
16 #include <linux/rtc.h>
17
18 #define DRV_VERSION "0.3"
19
20 /* Register map */
21 /* rtc section */
22 #define ISL1208_REG_SC 0x00
23 #define ISL1208_REG_MN 0x01
24 #define ISL1208_REG_HR 0x02
25 #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
26 #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
27 #define ISL1208_REG_DT 0x03
28 #define ISL1208_REG_MO 0x04
29 #define ISL1208_REG_YR 0x05
30 #define ISL1208_REG_DW 0x06
31 #define ISL1208_RTC_SECTION_LEN 7
32
33 /* control/status section */
34 #define ISL1208_REG_SR 0x07
35 #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
36 #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
37 #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
38 #define ISL1208_REG_SR_ALM (1<<2) /* alarm */
39 #define ISL1208_REG_SR_BAT (1<<1) /* battery */
40 #define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
41 #define ISL1208_REG_INT 0x08
42 #define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
43 #define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
44 #define ISL1208_REG_09 0x09 /* reserved */
45 #define ISL1208_REG_ATR 0x0a
46 #define ISL1208_REG_DTR 0x0b
47
48 /* alarm section */
49 #define ISL1208_REG_SCA 0x0c
50 #define ISL1208_REG_MNA 0x0d
51 #define ISL1208_REG_HRA 0x0e
52 #define ISL1208_REG_DTA 0x0f
53 #define ISL1208_REG_MOA 0x10
54 #define ISL1208_REG_DWA 0x11
55 #define ISL1208_ALARM_SECTION_LEN 6
56
57 /* user section */
58 #define ISL1208_REG_USR1 0x12
59 #define ISL1208_REG_USR2 0x13
60 #define ISL1208_USR_SECTION_LEN 2
61
62 static struct i2c_driver isl1208_driver;
63
64 /* block read */
65 static int
66 isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
67 unsigned len)
68 {
69 u8 reg_addr[1] = { reg };
70 struct i2c_msg msgs[2] = {
71 {
72 .addr = client->addr,
73 .len = sizeof(reg_addr),
74 .buf = reg_addr
75 },
76 {
77 .addr = client->addr,
78 .flags = I2C_M_RD,
79 .len = len,
80 .buf = buf
81 }
82 };
83 int ret;
84
85 BUG_ON(reg > ISL1208_REG_USR2);
86 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
87
88 ret = i2c_transfer(client->adapter, msgs, 2);
89 if (ret > 0)
90 ret = 0;
91 return ret;
92 }
93
94 /* block write */
95 static int
96 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
97 unsigned len)
98 {
99 u8 i2c_buf[ISL1208_REG_USR2 + 2];
100 struct i2c_msg msgs[1] = {
101 {
102 .addr = client->addr,
103 .len = len + 1,
104 .buf = i2c_buf
105 }
106 };
107 int ret;
108
109 BUG_ON(reg > ISL1208_REG_USR2);
110 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
111
112 i2c_buf[0] = reg;
113 memcpy(&i2c_buf[1], &buf[0], len);
114
115 ret = i2c_transfer(client->adapter, msgs, 1);
116 if (ret > 0)
117 ret = 0;
118 return ret;
119 }
120
121 /* simple check to see whether we have a isl1208 */
122 static int
123 isl1208_i2c_validate_client(struct i2c_client *client)
124 {
125 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
126 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
127 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
128 };
129 int i;
130 int ret;
131
132 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
133 if (ret < 0)
134 return ret;
135
136 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
137 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
138 return -ENODEV;
139 }
140
141 return 0;
142 }
143
144 static int
145 isl1208_i2c_get_sr(struct i2c_client *client)
146 {
147 int sr = i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
148 if (sr < 0)
149 return -EIO;
150
151 return sr;
152 }
153
154 static int
155 isl1208_i2c_get_atr(struct i2c_client *client)
156 {
157 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
158 if (atr < 0)
159 return atr;
160
161 /* The 6bit value in the ATR register controls the load
162 * capacitance C_load * in steps of 0.25pF
163 *
164 * bit (1<<5) of the ATR register is inverted
165 *
166 * C_load(ATR=0x20) = 4.50pF
167 * C_load(ATR=0x00) = 12.50pF
168 * C_load(ATR=0x1f) = 20.25pF
169 *
170 */
171
172 atr &= 0x3f; /* mask out lsb */
173 atr ^= 1 << 5; /* invert 6th bit */
174 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
175
176 return atr;
177 }
178
179 static int
180 isl1208_i2c_get_dtr(struct i2c_client *client)
181 {
182 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
183 if (dtr < 0)
184 return -EIO;
185
186 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
187 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
188
189 return dtr;
190 }
191
192 static int
193 isl1208_i2c_get_usr(struct i2c_client *client)
194 {
195 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
196 int ret;
197
198 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
199 ISL1208_USR_SECTION_LEN);
200 if (ret < 0)
201 return ret;
202
203 return (buf[1] << 8) | buf[0];
204 }
205
206 static int
207 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
208 {
209 u8 buf[ISL1208_USR_SECTION_LEN];
210
211 buf[0] = usr & 0xff;
212 buf[1] = (usr >> 8) & 0xff;
213
214 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
215 ISL1208_USR_SECTION_LEN);
216 }
217
218 static int
219 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
220 {
221 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
222
223 if (icr < 0) {
224 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
225 return icr;
226 }
227
228 if (enable)
229 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
230 else
231 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
232
233 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
234 if (icr < 0) {
235 dev_err(&client->dev, "%s: writing INT failed\n", __func__);
236 return icr;
237 }
238
239 return 0;
240 }
241
242 static int
243 isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
244 {
245 struct i2c_client *const client = to_i2c_client(dev);
246 int sr, dtr, atr, usr;
247
248 sr = isl1208_i2c_get_sr(client);
249 if (sr < 0) {
250 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
251 return sr;
252 }
253
254 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
255 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
256 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
257 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
258 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
259 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
260 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
261
262 seq_printf(seq, "batt_status\t: %s\n",
263 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
264
265 dtr = isl1208_i2c_get_dtr(client);
266 if (dtr >= 0 - 1)
267 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
268
269 atr = isl1208_i2c_get_atr(client);
270 if (atr >= 0)
271 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
272 atr >> 2, (atr & 0x3) * 25);
273
274 usr = isl1208_i2c_get_usr(client);
275 if (usr >= 0)
276 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
277
278 return 0;
279 }
280
281 static int
282 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
283 {
284 int sr;
285 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
286
287 sr = isl1208_i2c_get_sr(client);
288 if (sr < 0) {
289 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
290 return -EIO;
291 }
292
293 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
294 if (sr < 0) {
295 dev_err(&client->dev, "%s: reading RTC section failed\n",
296 __func__);
297 return sr;
298 }
299
300 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
301 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
302
303 /* HR field has a more complex interpretation */
304 {
305 const u8 _hr = regs[ISL1208_REG_HR];
306 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
307 tm->tm_hour = bcd2bin(_hr & 0x3f);
308 else {
309 /* 12h format */
310 tm->tm_hour = bcd2bin(_hr & 0x1f);
311 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
312 tm->tm_hour += 12;
313 }
314 }
315
316 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
317 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
318 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
319 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
320
321 return 0;
322 }
323
324 static int
325 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
326 {
327 struct rtc_time *const tm = &alarm->time;
328 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
329 int icr, yr, sr = isl1208_i2c_get_sr(client);
330
331 if (sr < 0) {
332 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
333 return sr;
334 }
335
336 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
337 ISL1208_ALARM_SECTION_LEN);
338 if (sr < 0) {
339 dev_err(&client->dev, "%s: reading alarm section failed\n",
340 __func__);
341 return sr;
342 }
343
344 /* MSB of each alarm register is an enable bit */
345 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
346 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
347 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
348 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
349 tm->tm_mon =
350 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
351 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
352
353 /* The alarm doesn't store the year so get it from the rtc section */
354 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
355 if (yr < 0) {
356 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
357 return yr;
358 }
359 tm->tm_year = bcd2bin(yr) + 100;
360
361 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
362 if (icr < 0) {
363 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
364 return icr;
365 }
366 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
367
368 return 0;
369 }
370
371 static int
372 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
373 {
374 struct rtc_time *alarm_tm = &alarm->time;
375 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
376 const int offs = ISL1208_REG_SCA;
377 unsigned long rtc_secs, alarm_secs;
378 struct rtc_time rtc_tm;
379 int err, enable;
380
381 err = isl1208_i2c_read_time(client, &rtc_tm);
382 if (err)
383 return err;
384 err = rtc_tm_to_time(&rtc_tm, &rtc_secs);
385 if (err)
386 return err;
387 err = rtc_tm_to_time(alarm_tm, &alarm_secs);
388 if (err)
389 return err;
390
391 /* If the alarm time is before the current time disable the alarm */
392 if (!alarm->enabled || alarm_secs <= rtc_secs)
393 enable = 0x00;
394 else
395 enable = 0x80;
396
397 /* Program the alarm and enable it for each setting */
398 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
399 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
400 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
401 ISL1208_REG_HR_MIL | enable;
402
403 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
404 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
405 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
406
407 /* write ALARM registers */
408 err = isl1208_i2c_set_regs(client, offs, regs,
409 ISL1208_ALARM_SECTION_LEN);
410 if (err < 0) {
411 dev_err(&client->dev, "%s: writing ALARM section failed\n",
412 __func__);
413 return err;
414 }
415
416 err = isl1208_rtc_toggle_alarm(client, enable);
417 if (err)
418 return err;
419
420 return 0;
421 }
422
423 static int
424 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
425 {
426 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
427 }
428
429 static int
430 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
431 {
432 int sr;
433 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
434
435 /* The clock has an 8 bit wide bcd-coded register (they never learn)
436 * for the year. tm_year is an offset from 1900 and we are interested
437 * in the 2000-2099 range, so any value less than 100 is invalid.
438 */
439 if (tm->tm_year < 100)
440 return -EINVAL;
441
442 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
443 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
444 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
445
446 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
447 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
448 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
449
450 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
451
452 sr = isl1208_i2c_get_sr(client);
453 if (sr < 0) {
454 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
455 return sr;
456 }
457
458 /* set WRTC */
459 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
460 sr | ISL1208_REG_SR_WRTC);
461 if (sr < 0) {
462 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
463 return sr;
464 }
465
466 /* write RTC registers */
467 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
468 if (sr < 0) {
469 dev_err(&client->dev, "%s: writing RTC section failed\n",
470 __func__);
471 return sr;
472 }
473
474 /* clear WRTC again */
475 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
476 sr & ~ISL1208_REG_SR_WRTC);
477 if (sr < 0) {
478 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
479 return sr;
480 }
481
482 return 0;
483 }
484
485
486 static int
487 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
488 {
489 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
490 }
491
492 static int
493 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
494 {
495 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
496 }
497
498 static int
499 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
500 {
501 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
502 }
503
504 static irqreturn_t
505 isl1208_rtc_interrupt(int irq, void *data)
506 {
507 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
508 struct i2c_client *client = data;
509 struct rtc_device *rtc = i2c_get_clientdata(client);
510 int handled = 0, sr, err;
511
512 /*
513 * I2C reads get NAK'ed if we read straight away after an interrupt?
514 * Using a mdelay/msleep didn't seem to help either, so we work around
515 * this by continually trying to read the register for a short time.
516 */
517 while (1) {
518 sr = isl1208_i2c_get_sr(client);
519 if (sr >= 0)
520 break;
521
522 if (time_after(jiffies, timeout)) {
523 dev_err(&client->dev, "%s: reading SR failed\n",
524 __func__);
525 return sr;
526 }
527 }
528
529 if (sr & ISL1208_REG_SR_ALM) {
530 dev_dbg(&client->dev, "alarm!\n");
531
532 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
533
534 /* Clear the alarm */
535 sr &= ~ISL1208_REG_SR_ALM;
536 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
537 if (sr < 0)
538 dev_err(&client->dev, "%s: writing SR failed\n",
539 __func__);
540 else
541 handled = 1;
542
543 /* Disable the alarm */
544 err = isl1208_rtc_toggle_alarm(client, 0);
545 if (err)
546 return err;
547 }
548
549 return handled ? IRQ_HANDLED : IRQ_NONE;
550 }
551
552 static const struct rtc_class_ops isl1208_rtc_ops = {
553 .proc = isl1208_rtc_proc,
554 .read_time = isl1208_rtc_read_time,
555 .set_time = isl1208_rtc_set_time,
556 .read_alarm = isl1208_rtc_read_alarm,
557 .set_alarm = isl1208_rtc_set_alarm,
558 };
559
560 /* sysfs interface */
561
562 static ssize_t
563 isl1208_sysfs_show_atrim(struct device *dev,
564 struct device_attribute *attr, char *buf)
565 {
566 int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
567 if (atr < 0)
568 return atr;
569
570 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
571 }
572
573 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
574
575 static ssize_t
576 isl1208_sysfs_show_dtrim(struct device *dev,
577 struct device_attribute *attr, char *buf)
578 {
579 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
580 if (dtr < 0)
581 return dtr;
582
583 return sprintf(buf, "%d ppm\n", dtr);
584 }
585
586 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
587
588 static ssize_t
589 isl1208_sysfs_show_usr(struct device *dev,
590 struct device_attribute *attr, char *buf)
591 {
592 int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
593 if (usr < 0)
594 return usr;
595
596 return sprintf(buf, "0x%.4x\n", usr);
597 }
598
599 static ssize_t
600 isl1208_sysfs_store_usr(struct device *dev,
601 struct device_attribute *attr,
602 const char *buf, size_t count)
603 {
604 int usr = -1;
605
606 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
607 if (sscanf(buf, "%x", &usr) != 1)
608 return -EINVAL;
609 } else {
610 if (sscanf(buf, "%d", &usr) != 1)
611 return -EINVAL;
612 }
613
614 if (usr < 0 || usr > 0xffff)
615 return -EINVAL;
616
617 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
618 }
619
620 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
621 isl1208_sysfs_store_usr);
622
623 static struct attribute *isl1208_rtc_attrs[] = {
624 &dev_attr_atrim.attr,
625 &dev_attr_dtrim.attr,
626 &dev_attr_usr.attr,
627 NULL
628 };
629
630 static const struct attribute_group isl1208_rtc_sysfs_files = {
631 .attrs = isl1208_rtc_attrs,
632 };
633
634 static int
635 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
636 {
637 int rc = 0;
638 struct rtc_device *rtc;
639
640 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
641 return -ENODEV;
642
643 if (isl1208_i2c_validate_client(client) < 0)
644 return -ENODEV;
645
646 dev_info(&client->dev,
647 "chip found, driver version " DRV_VERSION "\n");
648
649 if (client->irq > 0) {
650 rc = request_threaded_irq(client->irq, NULL,
651 isl1208_rtc_interrupt,
652 IRQF_SHARED,
653 isl1208_driver.driver.name, client);
654 if (!rc) {
655 device_init_wakeup(&client->dev, 1);
656 enable_irq_wake(client->irq);
657 } else {
658 dev_err(&client->dev,
659 "Unable to request irq %d, no alarm support\n",
660 client->irq);
661 client->irq = 0;
662 }
663 }
664
665 rtc = rtc_device_register(isl1208_driver.driver.name,
666 &client->dev, &isl1208_rtc_ops,
667 THIS_MODULE);
668 if (IS_ERR(rtc)) {
669 rc = PTR_ERR(rtc);
670 goto exit_free_irq;
671 }
672
673 i2c_set_clientdata(client, rtc);
674
675 rc = isl1208_i2c_get_sr(client);
676 if (rc < 0) {
677 dev_err(&client->dev, "reading status failed\n");
678 goto exit_unregister;
679 }
680
681 if (rc & ISL1208_REG_SR_RTCF)
682 dev_warn(&client->dev, "rtc power failure detected, "
683 "please set clock.\n");
684
685 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
686 if (rc)
687 goto exit_unregister;
688
689 return 0;
690
691 exit_unregister:
692 rtc_device_unregister(rtc);
693 exit_free_irq:
694 if (client->irq)
695 free_irq(client->irq, client);
696
697 return rc;
698 }
699
700 static int
701 isl1208_remove(struct i2c_client *client)
702 {
703 struct rtc_device *rtc = i2c_get_clientdata(client);
704
705 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
706 rtc_device_unregister(rtc);
707 if (client->irq)
708 free_irq(client->irq, client);
709
710 return 0;
711 }
712
713 static const struct i2c_device_id isl1208_id[] = {
714 { "isl1208", 0 },
715 { "isl1218", 0 },
716 { }
717 };
718 MODULE_DEVICE_TABLE(i2c, isl1208_id);
719
720 static struct i2c_driver isl1208_driver = {
721 .driver = {
722 .name = "rtc-isl1208",
723 },
724 .probe = isl1208_probe,
725 .remove = isl1208_remove,
726 .id_table = isl1208_id,
727 };
728
729 module_i2c_driver(isl1208_driver);
730
731 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
732 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
733 MODULE_LICENSE("GPL");
734 MODULE_VERSION(DRV_VERSION);
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