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Merge tag 'sound-4.17-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[mirror_ubuntu-jammy-kernel.git] / drivers / rtc / rtc-isl1208.c
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 /* Register map */
19 /* rtc section */
20 #define ISL1208_REG_SC 0x00
21 #define ISL1208_REG_MN 0x01
22 #define ISL1208_REG_HR 0x02
23 #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
24 #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
25 #define ISL1208_REG_DT 0x03
26 #define ISL1208_REG_MO 0x04
27 #define ISL1208_REG_YR 0x05
28 #define ISL1208_REG_DW 0x06
29 #define ISL1208_RTC_SECTION_LEN 7
30
31 /* control/status section */
32 #define ISL1208_REG_SR 0x07
33 #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
34 #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
35 #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
36 #define ISL1208_REG_SR_ALM (1<<2) /* alarm */
37 #define ISL1208_REG_SR_BAT (1<<1) /* battery */
38 #define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
39 #define ISL1208_REG_INT 0x08
40 #define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
41 #define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
42 #define ISL1208_REG_09 0x09 /* reserved */
43 #define ISL1208_REG_ATR 0x0a
44 #define ISL1208_REG_DTR 0x0b
45
46 /* alarm section */
47 #define ISL1208_REG_SCA 0x0c
48 #define ISL1208_REG_MNA 0x0d
49 #define ISL1208_REG_HRA 0x0e
50 #define ISL1208_REG_DTA 0x0f
51 #define ISL1208_REG_MOA 0x10
52 #define ISL1208_REG_DWA 0x11
53 #define ISL1208_ALARM_SECTION_LEN 6
54
55 /* user section */
56 #define ISL1208_REG_USR1 0x12
57 #define ISL1208_REG_USR2 0x13
58 #define ISL1208_USR_SECTION_LEN 2
59
60 static struct i2c_driver isl1208_driver;
61
62 /* block read */
63 static int
64 isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
65 unsigned len)
66 {
67 u8 reg_addr[1] = { reg };
68 struct i2c_msg msgs[2] = {
69 {
70 .addr = client->addr,
71 .len = sizeof(reg_addr),
72 .buf = reg_addr
73 },
74 {
75 .addr = client->addr,
76 .flags = I2C_M_RD,
77 .len = len,
78 .buf = buf
79 }
80 };
81 int ret;
82
83 BUG_ON(reg > ISL1208_REG_USR2);
84 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
85
86 ret = i2c_transfer(client->adapter, msgs, 2);
87 if (ret > 0)
88 ret = 0;
89 return ret;
90 }
91
92 /* block write */
93 static int
94 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
95 unsigned len)
96 {
97 u8 i2c_buf[ISL1208_REG_USR2 + 2];
98 struct i2c_msg msgs[1] = {
99 {
100 .addr = client->addr,
101 .len = len + 1,
102 .buf = i2c_buf
103 }
104 };
105 int ret;
106
107 BUG_ON(reg > ISL1208_REG_USR2);
108 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
109
110 i2c_buf[0] = reg;
111 memcpy(&i2c_buf[1], &buf[0], len);
112
113 ret = i2c_transfer(client->adapter, msgs, 1);
114 if (ret > 0)
115 ret = 0;
116 return ret;
117 }
118
119 /* simple check to see whether we have a isl1208 */
120 static int
121 isl1208_i2c_validate_client(struct i2c_client *client)
122 {
123 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
124 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
125 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
126 };
127 int i;
128 int ret;
129
130 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
131 if (ret < 0)
132 return ret;
133
134 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
135 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
136 return -ENODEV;
137 }
138
139 return 0;
140 }
141
142 static int
143 isl1208_i2c_get_sr(struct i2c_client *client)
144 {
145 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
146 }
147
148 static int
149 isl1208_i2c_get_atr(struct i2c_client *client)
150 {
151 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
152 if (atr < 0)
153 return atr;
154
155 /* The 6bit value in the ATR register controls the load
156 * capacitance C_load * in steps of 0.25pF
157 *
158 * bit (1<<5) of the ATR register is inverted
159 *
160 * C_load(ATR=0x20) = 4.50pF
161 * C_load(ATR=0x00) = 12.50pF
162 * C_load(ATR=0x1f) = 20.25pF
163 *
164 */
165
166 atr &= 0x3f; /* mask out lsb */
167 atr ^= 1 << 5; /* invert 6th bit */
168 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
169
170 return atr;
171 }
172
173 static int
174 isl1208_i2c_get_dtr(struct i2c_client *client)
175 {
176 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
177 if (dtr < 0)
178 return -EIO;
179
180 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
181 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
182
183 return dtr;
184 }
185
186 static int
187 isl1208_i2c_get_usr(struct i2c_client *client)
188 {
189 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
190 int ret;
191
192 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
193 ISL1208_USR_SECTION_LEN);
194 if (ret < 0)
195 return ret;
196
197 return (buf[1] << 8) | buf[0];
198 }
199
200 static int
201 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
202 {
203 u8 buf[ISL1208_USR_SECTION_LEN];
204
205 buf[0] = usr & 0xff;
206 buf[1] = (usr >> 8) & 0xff;
207
208 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
209 ISL1208_USR_SECTION_LEN);
210 }
211
212 static int
213 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
214 {
215 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
216
217 if (icr < 0) {
218 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
219 return icr;
220 }
221
222 if (enable)
223 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
224 else
225 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
226
227 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
228 if (icr < 0) {
229 dev_err(&client->dev, "%s: writing INT failed\n", __func__);
230 return icr;
231 }
232
233 return 0;
234 }
235
236 static int
237 isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
238 {
239 struct i2c_client *const client = to_i2c_client(dev);
240 int sr, dtr, atr, usr;
241
242 sr = isl1208_i2c_get_sr(client);
243 if (sr < 0) {
244 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
245 return sr;
246 }
247
248 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
249 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
250 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
251 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
252 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
253 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
254 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
255
256 seq_printf(seq, "batt_status\t: %s\n",
257 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
258
259 dtr = isl1208_i2c_get_dtr(client);
260 if (dtr >= 0 - 1)
261 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
262
263 atr = isl1208_i2c_get_atr(client);
264 if (atr >= 0)
265 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
266 atr >> 2, (atr & 0x3) * 25);
267
268 usr = isl1208_i2c_get_usr(client);
269 if (usr >= 0)
270 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
271
272 return 0;
273 }
274
275 static int
276 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
277 {
278 int sr;
279 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
280
281 sr = isl1208_i2c_get_sr(client);
282 if (sr < 0) {
283 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
284 return -EIO;
285 }
286
287 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
288 if (sr < 0) {
289 dev_err(&client->dev, "%s: reading RTC section failed\n",
290 __func__);
291 return sr;
292 }
293
294 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
295 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
296
297 /* HR field has a more complex interpretation */
298 {
299 const u8 _hr = regs[ISL1208_REG_HR];
300 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
301 tm->tm_hour = bcd2bin(_hr & 0x3f);
302 else {
303 /* 12h format */
304 tm->tm_hour = bcd2bin(_hr & 0x1f);
305 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
306 tm->tm_hour += 12;
307 }
308 }
309
310 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
311 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
312 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
313 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
314
315 return 0;
316 }
317
318 static int
319 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
320 {
321 struct rtc_time *const tm = &alarm->time;
322 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
323 int icr, yr, sr = isl1208_i2c_get_sr(client);
324
325 if (sr < 0) {
326 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
327 return sr;
328 }
329
330 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
331 ISL1208_ALARM_SECTION_LEN);
332 if (sr < 0) {
333 dev_err(&client->dev, "%s: reading alarm section failed\n",
334 __func__);
335 return sr;
336 }
337
338 /* MSB of each alarm register is an enable bit */
339 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
340 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
341 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
342 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
343 tm->tm_mon =
344 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
345 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
346
347 /* The alarm doesn't store the year so get it from the rtc section */
348 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
349 if (yr < 0) {
350 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
351 return yr;
352 }
353 tm->tm_year = bcd2bin(yr) + 100;
354
355 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
356 if (icr < 0) {
357 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
358 return icr;
359 }
360 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
361
362 return 0;
363 }
364
365 static int
366 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
367 {
368 struct rtc_time *alarm_tm = &alarm->time;
369 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
370 const int offs = ISL1208_REG_SCA;
371 struct rtc_time rtc_tm;
372 int err, enable;
373
374 err = isl1208_i2c_read_time(client, &rtc_tm);
375 if (err)
376 return err;
377
378 /* If the alarm time is before the current time disable the alarm */
379 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)
380 enable = 0x00;
381 else
382 enable = 0x80;
383
384 /* Program the alarm and enable it for each setting */
385 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
386 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
387 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
388 ISL1208_REG_HR_MIL | enable;
389
390 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
391 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
392 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
393
394 /* write ALARM registers */
395 err = isl1208_i2c_set_regs(client, offs, regs,
396 ISL1208_ALARM_SECTION_LEN);
397 if (err < 0) {
398 dev_err(&client->dev, "%s: writing ALARM section failed\n",
399 __func__);
400 return err;
401 }
402
403 err = isl1208_rtc_toggle_alarm(client, enable);
404 if (err)
405 return err;
406
407 return 0;
408 }
409
410 static int
411 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
412 {
413 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
414 }
415
416 static int
417 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
418 {
419 int sr;
420 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
421
422 /* The clock has an 8 bit wide bcd-coded register (they never learn)
423 * for the year. tm_year is an offset from 1900 and we are interested
424 * in the 2000-2099 range, so any value less than 100 is invalid.
425 */
426 if (tm->tm_year < 100)
427 return -EINVAL;
428
429 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
430 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
431 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
432
433 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
434 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
435 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
436
437 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
438
439 sr = isl1208_i2c_get_sr(client);
440 if (sr < 0) {
441 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
442 return sr;
443 }
444
445 /* set WRTC */
446 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
447 sr | ISL1208_REG_SR_WRTC);
448 if (sr < 0) {
449 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
450 return sr;
451 }
452
453 /* write RTC registers */
454 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
455 if (sr < 0) {
456 dev_err(&client->dev, "%s: writing RTC section failed\n",
457 __func__);
458 return sr;
459 }
460
461 /* clear WRTC again */
462 sr = isl1208_i2c_get_sr(client);
463 if (sr < 0) {
464 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
465 return sr;
466 }
467 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
468 sr & ~ISL1208_REG_SR_WRTC);
469 if (sr < 0) {
470 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
471 return sr;
472 }
473
474 return 0;
475 }
476
477
478 static int
479 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
480 {
481 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
482 }
483
484 static int
485 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
486 {
487 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
488 }
489
490 static int
491 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
492 {
493 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
494 }
495
496 static irqreturn_t
497 isl1208_rtc_interrupt(int irq, void *data)
498 {
499 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
500 struct i2c_client *client = data;
501 struct rtc_device *rtc = i2c_get_clientdata(client);
502 int handled = 0, sr, err;
503
504 /*
505 * I2C reads get NAK'ed if we read straight away after an interrupt?
506 * Using a mdelay/msleep didn't seem to help either, so we work around
507 * this by continually trying to read the register for a short time.
508 */
509 while (1) {
510 sr = isl1208_i2c_get_sr(client);
511 if (sr >= 0)
512 break;
513
514 if (time_after(jiffies, timeout)) {
515 dev_err(&client->dev, "%s: reading SR failed\n",
516 __func__);
517 return sr;
518 }
519 }
520
521 if (sr & ISL1208_REG_SR_ALM) {
522 dev_dbg(&client->dev, "alarm!\n");
523
524 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
525
526 /* Clear the alarm */
527 sr &= ~ISL1208_REG_SR_ALM;
528 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
529 if (sr < 0)
530 dev_err(&client->dev, "%s: writing SR failed\n",
531 __func__);
532 else
533 handled = 1;
534
535 /* Disable the alarm */
536 err = isl1208_rtc_toggle_alarm(client, 0);
537 if (err)
538 return err;
539 }
540
541 return handled ? IRQ_HANDLED : IRQ_NONE;
542 }
543
544 static const struct rtc_class_ops isl1208_rtc_ops = {
545 .proc = isl1208_rtc_proc,
546 .read_time = isl1208_rtc_read_time,
547 .set_time = isl1208_rtc_set_time,
548 .read_alarm = isl1208_rtc_read_alarm,
549 .set_alarm = isl1208_rtc_set_alarm,
550 };
551
552 /* sysfs interface */
553
554 static ssize_t
555 isl1208_sysfs_show_atrim(struct device *dev,
556 struct device_attribute *attr, char *buf)
557 {
558 int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
559 if (atr < 0)
560 return atr;
561
562 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
563 }
564
565 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
566
567 static ssize_t
568 isl1208_sysfs_show_dtrim(struct device *dev,
569 struct device_attribute *attr, char *buf)
570 {
571 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
572 if (dtr < 0)
573 return dtr;
574
575 return sprintf(buf, "%d ppm\n", dtr);
576 }
577
578 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
579
580 static ssize_t
581 isl1208_sysfs_show_usr(struct device *dev,
582 struct device_attribute *attr, char *buf)
583 {
584 int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
585 if (usr < 0)
586 return usr;
587
588 return sprintf(buf, "0x%.4x\n", usr);
589 }
590
591 static ssize_t
592 isl1208_sysfs_store_usr(struct device *dev,
593 struct device_attribute *attr,
594 const char *buf, size_t count)
595 {
596 int usr = -1;
597
598 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
599 if (sscanf(buf, "%x", &usr) != 1)
600 return -EINVAL;
601 } else {
602 if (sscanf(buf, "%d", &usr) != 1)
603 return -EINVAL;
604 }
605
606 if (usr < 0 || usr > 0xffff)
607 return -EINVAL;
608
609 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
610 }
611
612 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
613 isl1208_sysfs_store_usr);
614
615 static struct attribute *isl1208_rtc_attrs[] = {
616 &dev_attr_atrim.attr,
617 &dev_attr_dtrim.attr,
618 &dev_attr_usr.attr,
619 NULL
620 };
621
622 static const struct attribute_group isl1208_rtc_sysfs_files = {
623 .attrs = isl1208_rtc_attrs,
624 };
625
626 static int
627 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
628 {
629 int rc = 0;
630 struct rtc_device *rtc;
631
632 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
633 return -ENODEV;
634
635 if (isl1208_i2c_validate_client(client) < 0)
636 return -ENODEV;
637
638 rtc = devm_rtc_allocate_device(&client->dev);
639 if (IS_ERR(rtc))
640 return PTR_ERR(rtc);
641
642 rtc->ops = &isl1208_rtc_ops;
643
644 i2c_set_clientdata(client, rtc);
645
646 rc = isl1208_i2c_get_sr(client);
647 if (rc < 0) {
648 dev_err(&client->dev, "reading status failed\n");
649 return rc;
650 }
651
652 if (rc & ISL1208_REG_SR_RTCF)
653 dev_warn(&client->dev, "rtc power failure detected, "
654 "please set clock.\n");
655
656 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
657 if (rc)
658 return rc;
659
660 if (client->irq > 0) {
661 rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
662 isl1208_rtc_interrupt,
663 IRQF_SHARED | IRQF_ONESHOT,
664 isl1208_driver.driver.name,
665 client);
666 if (!rc) {
667 device_init_wakeup(&client->dev, 1);
668 enable_irq_wake(client->irq);
669 } else {
670 dev_err(&client->dev,
671 "Unable to request irq %d, no alarm support\n",
672 client->irq);
673 client->irq = 0;
674 }
675 }
676
677 return rtc_register_device(rtc);
678 }
679
680 static int
681 isl1208_remove(struct i2c_client *client)
682 {
683 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
684
685 return 0;
686 }
687
688 static const struct i2c_device_id isl1208_id[] = {
689 { "isl1208", 0 },
690 { "isl1218", 0 },
691 { }
692 };
693 MODULE_DEVICE_TABLE(i2c, isl1208_id);
694
695 static const struct of_device_id isl1208_of_match[] = {
696 { .compatible = "isil,isl1208" },
697 { .compatible = "isil,isl1218" },
698 { }
699 };
700 MODULE_DEVICE_TABLE(of, isl1208_of_match);
701
702 static struct i2c_driver isl1208_driver = {
703 .driver = {
704 .name = "rtc-isl1208",
705 .of_match_table = of_match_ptr(isl1208_of_match),
706 },
707 .probe = isl1208_probe,
708 .remove = isl1208_remove,
709 .id_table = isl1208_id,
710 };
711
712 module_i2c_driver(isl1208_driver);
713
714 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
715 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
716 MODULE_LICENSE("GPL");
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