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ARM: omap2: remove unnecessary boot_lock
[linux-2.6/linux-2.6-arm.git] / drivers / rtc / rtc-isl1208.c
blobec5ef518a09b260abadc85826aa834dfb443d2a3
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/bcd.h>
14 #include <linux/i2c.h>
15 #include <linux/module.h>
16 #include <linux/of_irq.h>
17 #include <linux/rtc.h>
18
19 /* Register map */
20 /* rtc section */
21 #define ISL1208_REG_SC 0x00
22 #define ISL1208_REG_MN 0x01
23 #define ISL1208_REG_HR 0x02
24 #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
25 #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
26 #define ISL1208_REG_DT 0x03
27 #define ISL1208_REG_MO 0x04
28 #define ISL1208_REG_YR 0x05
29 #define ISL1208_REG_DW 0x06
30 #define ISL1208_RTC_SECTION_LEN 7
31
32 /* control/status section */
33 #define ISL1208_REG_SR 0x07
34 #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
35 #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
36 #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
37 #define ISL1208_REG_SR_EVT (1<<3) /* event */
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 ISL1219_REG_EV 0x09
45 #define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
46 #define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
47 #define ISL1208_REG_ATR 0x0a
48 #define ISL1208_REG_DTR 0x0b
49
50 /* alarm section */
51 #define ISL1208_REG_SCA 0x0c
52 #define ISL1208_REG_MNA 0x0d
53 #define ISL1208_REG_HRA 0x0e
54 #define ISL1208_REG_DTA 0x0f
55 #define ISL1208_REG_MOA 0x10
56 #define ISL1208_REG_DWA 0x11
57 #define ISL1208_ALARM_SECTION_LEN 6
58
59 /* user section */
60 #define ISL1208_REG_USR1 0x12
61 #define ISL1208_REG_USR2 0x13
62 #define ISL1208_USR_SECTION_LEN 2
63
64 /* event section */
65 #define ISL1219_REG_SCT 0x14
66 #define ISL1219_REG_MNT 0x15
67 #define ISL1219_REG_HRT 0x16
68 #define ISL1219_REG_DTT 0x17
69 #define ISL1219_REG_MOT 0x18
70 #define ISL1219_REG_YRT 0x19
71 #define ISL1219_EVT_SECTION_LEN 6
72
73 static struct i2c_driver isl1208_driver;
74
75 /* ISL1208 various variants */
76 enum {
77 TYPE_ISL1208 = 0,
78 TYPE_ISL1218,
79 TYPE_ISL1219,
80 };
81
82 /* block read */
83 static int
84 isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
85 unsigned len)
86 {
87 u8 reg_addr[1] = { reg };
88 struct i2c_msg msgs[2] = {
89 {
90 .addr = client->addr,
91 .len = sizeof(reg_addr),
92 .buf = reg_addr
93 },
94 {
95 .addr = client->addr,
96 .flags = I2C_M_RD,
97 .len = len,
98 .buf = buf
99 }
100 };
101 int ret;
102
103 WARN_ON(reg > ISL1219_REG_YRT);
104 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
105
106 ret = i2c_transfer(client->adapter, msgs, 2);
107 if (ret > 0)
108 ret = 0;
109 return ret;
110 }
111
112 /* block write */
113 static int
114 isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
115 unsigned len)
116 {
117 u8 i2c_buf[ISL1208_REG_USR2 + 2];
118 struct i2c_msg msgs[1] = {
119 {
120 .addr = client->addr,
121 .len = len + 1,
122 .buf = i2c_buf
123 }
124 };
125 int ret;
126
127 WARN_ON(reg > ISL1219_REG_YRT);
128 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
129
130 i2c_buf[0] = reg;
131 memcpy(&i2c_buf[1], &buf[0], len);
132
133 ret = i2c_transfer(client->adapter, msgs, 1);
134 if (ret > 0)
135 ret = 0;
136 return ret;
137 }
138
139 /* simple check to see whether we have a isl1208 */
140 static int
141 isl1208_i2c_validate_client(struct i2c_client *client)
142 {
143 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
144 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
145 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
146 };
147 int i;
148 int ret;
149
150 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
151 if (ret < 0)
152 return ret;
153
154 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
155 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
156 return -ENODEV;
157 }
158
159 return 0;
160 }
161
162 static int
163 isl1208_i2c_get_sr(struct i2c_client *client)
164 {
165 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
166 }
167
168 static int
169 isl1208_i2c_get_atr(struct i2c_client *client)
170 {
171 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
172 if (atr < 0)
173 return atr;
174
175 /* The 6bit value in the ATR register controls the load
176 * capacitance C_load * in steps of 0.25pF
177 *
178 * bit (1<<5) of the ATR register is inverted
179 *
180 * C_load(ATR=0x20) = 4.50pF
181 * C_load(ATR=0x00) = 12.50pF
182 * C_load(ATR=0x1f) = 20.25pF
183 *
184 */
185
186 atr &= 0x3f; /* mask out lsb */
187 atr ^= 1 << 5; /* invert 6th bit */
188 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
189
190 return atr;
191 }
192
193 static int
194 isl1208_i2c_get_dtr(struct i2c_client *client)
195 {
196 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
197 if (dtr < 0)
198 return -EIO;
199
200 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
201 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
202
203 return dtr;
204 }
205
206 static int
207 isl1208_i2c_get_usr(struct i2c_client *client)
208 {
209 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
210 int ret;
211
212 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
213 ISL1208_USR_SECTION_LEN);
214 if (ret < 0)
215 return ret;
216
217 return (buf[1] << 8) | buf[0];
218 }
219
220 static int
221 isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
222 {
223 u8 buf[ISL1208_USR_SECTION_LEN];
224
225 buf[0] = usr & 0xff;
226 buf[1] = (usr >> 8) & 0xff;
227
228 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
229 ISL1208_USR_SECTION_LEN);
230 }
231
232 static int
233 isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
234 {
235 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
236
237 if (icr < 0) {
238 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
239 return icr;
240 }
241
242 if (enable)
243 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
244 else
245 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
246
247 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
248 if (icr < 0) {
249 dev_err(&client->dev, "%s: writing INT failed\n", __func__);
250 return icr;
251 }
252
253 return 0;
254 }
255
256 static int
257 isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
258 {
259 struct i2c_client *const client = to_i2c_client(dev);
260 int sr, dtr, atr, usr;
261
262 sr = isl1208_i2c_get_sr(client);
263 if (sr < 0) {
264 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
265 return sr;
266 }
267
268 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
269 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
270 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
271 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
272 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
273 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
274 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
275
276 seq_printf(seq, "batt_status\t: %s\n",
277 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
278
279 dtr = isl1208_i2c_get_dtr(client);
280 if (dtr >= 0 - 1)
281 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
282
283 atr = isl1208_i2c_get_atr(client);
284 if (atr >= 0)
285 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
286 atr >> 2, (atr & 0x3) * 25);
287
288 usr = isl1208_i2c_get_usr(client);
289 if (usr >= 0)
290 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
291
292 return 0;
293 }
294
295 static int
296 isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
297 {
298 int sr;
299 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
300
301 sr = isl1208_i2c_get_sr(client);
302 if (sr < 0) {
303 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
304 return -EIO;
305 }
306
307 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
308 if (sr < 0) {
309 dev_err(&client->dev, "%s: reading RTC section failed\n",
310 __func__);
311 return sr;
312 }
313
314 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
315 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
316
317 /* HR field has a more complex interpretation */
318 {
319 const u8 _hr = regs[ISL1208_REG_HR];
320 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
321 tm->tm_hour = bcd2bin(_hr & 0x3f);
322 else {
323 /* 12h format */
324 tm->tm_hour = bcd2bin(_hr & 0x1f);
325 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
326 tm->tm_hour += 12;
327 }
328 }
329
330 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
331 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
332 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
333 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
334
335 return 0;
336 }
337
338 static int
339 isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
340 {
341 struct rtc_time *const tm = &alarm->time;
342 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
343 int icr, yr, sr = isl1208_i2c_get_sr(client);
344
345 if (sr < 0) {
346 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
347 return sr;
348 }
349
350 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
351 ISL1208_ALARM_SECTION_LEN);
352 if (sr < 0) {
353 dev_err(&client->dev, "%s: reading alarm section failed\n",
354 __func__);
355 return sr;
356 }
357
358 /* MSB of each alarm register is an enable bit */
359 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
360 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
361 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
362 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
363 tm->tm_mon =
364 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
365 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
366
367 /* The alarm doesn't store the year so get it from the rtc section */
368 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
369 if (yr < 0) {
370 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
371 return yr;
372 }
373 tm->tm_year = bcd2bin(yr) + 100;
374
375 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
376 if (icr < 0) {
377 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
378 return icr;
379 }
380 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
381
382 return 0;
383 }
384
385 static int
386 isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
387 {
388 struct rtc_time *alarm_tm = &alarm->time;
389 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
390 const int offs = ISL1208_REG_SCA;
391 struct rtc_time rtc_tm;
392 int err, enable;
393
394 err = isl1208_i2c_read_time(client, &rtc_tm);
395 if (err)
396 return err;
397
398 /* If the alarm time is before the current time disable the alarm */
399 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)
400 enable = 0x00;
401 else
402 enable = 0x80;
403
404 /* Program the alarm and enable it for each setting */
405 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
406 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
407 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
408 ISL1208_REG_HR_MIL | enable;
409
410 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
411 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
412 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
413
414 /* write ALARM registers */
415 err = isl1208_i2c_set_regs(client, offs, regs,
416 ISL1208_ALARM_SECTION_LEN);
417 if (err < 0) {
418 dev_err(&client->dev, "%s: writing ALARM section failed\n",
419 __func__);
420 return err;
421 }
422
423 err = isl1208_rtc_toggle_alarm(client, enable);
424 if (err)
425 return err;
426
427 return 0;
428 }
429
430 static int
431 isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
432 {
433 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
434 }
435
436 static int
437 isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
438 {
439 int sr;
440 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
441
442 /* The clock has an 8 bit wide bcd-coded register (they never learn)
443 * for the year. tm_year is an offset from 1900 and we are interested
444 * in the 2000-2099 range, so any value less than 100 is invalid.
445 */
446 if (tm->tm_year < 100)
447 return -EINVAL;
448
449 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
450 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
451 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
452
453 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
454 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
455 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
456
457 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
458
459 sr = isl1208_i2c_get_sr(client);
460 if (sr < 0) {
461 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
462 return sr;
463 }
464
465 /* set WRTC */
466 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
467 sr | ISL1208_REG_SR_WRTC);
468 if (sr < 0) {
469 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
470 return sr;
471 }
472
473 /* write RTC registers */
474 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
475 if (sr < 0) {
476 dev_err(&client->dev, "%s: writing RTC section failed\n",
477 __func__);
478 return sr;
479 }
480
481 /* clear WRTC again */
482 sr = isl1208_i2c_get_sr(client);
483 if (sr < 0) {
484 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
485 return sr;
486 }
487 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
488 sr & ~ISL1208_REG_SR_WRTC);
489 if (sr < 0) {
490 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
491 return sr;
492 }
493
494 return 0;
495 }
496
497
498 static int
499 isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
500 {
501 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
502 }
503
504 static int
505 isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
506 {
507 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
508 }
509
510 static int
511 isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
512 {
513 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
514 }
515
516 static ssize_t timestamp0_store(struct device *dev,
517 struct device_attribute *attr,
518 const char *buf, size_t count)
519 {
520 struct i2c_client *client = to_i2c_client(dev->parent);
521 int sr;
522
523 sr = isl1208_i2c_get_sr(client);
524 if (sr < 0) {
525 dev_err(dev, "%s: reading SR failed\n", __func__);
526 return sr;
527 }
528
529 sr &= ~ISL1208_REG_SR_EVT;
530
531 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
532 if (sr < 0)
533 dev_err(dev, "%s: writing SR failed\n",
534 __func__);
535
536 return count;
537 };
538
539 static ssize_t timestamp0_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
541 {
542 struct i2c_client *client = to_i2c_client(dev->parent);
543 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
544 struct rtc_time tm;
545 int sr;
546
547 sr = isl1208_i2c_get_sr(client);
548 if (sr < 0) {
549 dev_err(dev, "%s: reading SR failed\n", __func__);
550 return sr;
551 }
552
553 if (!(sr & ISL1208_REG_SR_EVT))
554 return 0;
555
556 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,
557 ISL1219_EVT_SECTION_LEN);
558 if (sr < 0) {
559 dev_err(dev, "%s: reading event section failed\n",
560 __func__);
561 return 0;
562 }
563
564 /* MSB of each alarm register is an enable bit */
565 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);
566 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);
567 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);
568 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);
569 tm.tm_mon =
570 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;
571 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;
572
573 sr = rtc_valid_tm(&tm);
574 if (sr)
575 return sr;
576
577 return sprintf(buf, "%llu\n",
578 (unsigned long long)rtc_tm_to_time64(&tm));
579 };
580
581 static DEVICE_ATTR_RW(timestamp0);
582
583 static irqreturn_t
584 isl1208_rtc_interrupt(int irq, void *data)
585 {
586 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
587 struct i2c_client *client = data;
588 struct rtc_device *rtc = i2c_get_clientdata(client);
589 int handled = 0, sr, err;
590
591 /*
592 * I2C reads get NAK'ed if we read straight away after an interrupt?
593 * Using a mdelay/msleep didn't seem to help either, so we work around
594 * this by continually trying to read the register for a short time.
595 */
596 while (1) {
597 sr = isl1208_i2c_get_sr(client);
598 if (sr >= 0)
599 break;
600
601 if (time_after(jiffies, timeout)) {
602 dev_err(&client->dev, "%s: reading SR failed\n",
603 __func__);
604 return sr;
605 }
606 }
607
608 if (sr & ISL1208_REG_SR_ALM) {
609 dev_dbg(&client->dev, "alarm!\n");
610
611 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
612
613 /* Clear the alarm */
614 sr &= ~ISL1208_REG_SR_ALM;
615 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
616 if (sr < 0)
617 dev_err(&client->dev, "%s: writing SR failed\n",
618 __func__);
619 else
620 handled = 1;
621
622 /* Disable the alarm */
623 err = isl1208_rtc_toggle_alarm(client, 0);
624 if (err)
625 return err;
626 }
627
628 if (sr & ISL1208_REG_SR_EVT) {
629 sysfs_notify(&rtc->dev.kobj, NULL,
630 dev_attr_timestamp0.attr.name);
631 dev_warn(&client->dev, "event detected");
632 handled = 1;
633 }
634
635 return handled ? IRQ_HANDLED : IRQ_NONE;
636 }
637
638 static const struct rtc_class_ops isl1208_rtc_ops = {
639 .proc = isl1208_rtc_proc,
640 .read_time = isl1208_rtc_read_time,
641 .set_time = isl1208_rtc_set_time,
642 .read_alarm = isl1208_rtc_read_alarm,
643 .set_alarm = isl1208_rtc_set_alarm,
644 };
645
646 /* sysfs interface */
647
648 static ssize_t
649 isl1208_sysfs_show_atrim(struct device *dev,
650 struct device_attribute *attr, char *buf)
651 {
652 int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent));
653 if (atr < 0)
654 return atr;
655
656 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
657 }
658
659 static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
660
661 static ssize_t
662 isl1208_sysfs_show_dtrim(struct device *dev,
663 struct device_attribute *attr, char *buf)
664 {
665 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent));
666 if (dtr < 0)
667 return dtr;
668
669 return sprintf(buf, "%d ppm\n", dtr);
670 }
671
672 static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
673
674 static ssize_t
675 isl1208_sysfs_show_usr(struct device *dev,
676 struct device_attribute *attr, char *buf)
677 {
678 int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent));
679 if (usr < 0)
680 return usr;
681
682 return sprintf(buf, "0x%.4x\n", usr);
683 }
684
685 static ssize_t
686 isl1208_sysfs_store_usr(struct device *dev,
687 struct device_attribute *attr,
688 const char *buf, size_t count)
689 {
690 int usr = -1;
691
692 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
693 if (sscanf(buf, "%x", &usr) != 1)
694 return -EINVAL;
695 } else {
696 if (sscanf(buf, "%d", &usr) != 1)
697 return -EINVAL;
698 }
699
700 if (usr < 0 || usr > 0xffff)
701 return -EINVAL;
702
703 if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr))
704 return -EIO;
705
706 return count;
707 }
708
709 static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
710 isl1208_sysfs_store_usr);
711
712 static struct attribute *isl1208_rtc_attrs[] = {
713 &dev_attr_atrim.attr,
714 &dev_attr_dtrim.attr,
715 &dev_attr_usr.attr,
716 NULL
717 };
718
719 static const struct attribute_group isl1208_rtc_sysfs_files = {
720 .attrs = isl1208_rtc_attrs,
721 };
722
723 static struct attribute *isl1219_rtc_attrs[] = {
724 &dev_attr_timestamp0.attr,
725 NULL
726 };
727
728 static const struct attribute_group isl1219_rtc_sysfs_files = {
729 .attrs = isl1219_rtc_attrs,
730 };
731
732 static int isl1208_setup_irq(struct i2c_client *client, int irq)
733 {
734 int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
735 isl1208_rtc_interrupt,
736 IRQF_SHARED | IRQF_ONESHOT,
737 isl1208_driver.driver.name,
738 client);
739 if (!rc) {
740 device_init_wakeup(&client->dev, 1);
741 enable_irq_wake(irq);
742 } else {
743 dev_err(&client->dev,
744 "Unable to request irq %d, no alarm support\n",
745 irq);
746 }
747 return rc;
748 }
749
750 static int
751 isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
752 {
753 int rc = 0;
754 struct rtc_device *rtc;
755 int evdet_irq = -1;
756
757 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
758 return -ENODEV;
759
760 if (isl1208_i2c_validate_client(client) < 0)
761 return -ENODEV;
762
763 rtc = devm_rtc_allocate_device(&client->dev);
764 if (IS_ERR(rtc))
765 return PTR_ERR(rtc);
766
767 rtc->ops = &isl1208_rtc_ops;
768
769 i2c_set_clientdata(client, rtc);
770
771 rc = isl1208_i2c_get_sr(client);
772 if (rc < 0) {
773 dev_err(&client->dev, "reading status failed\n");
774 return rc;
775 }
776
777 if (rc & ISL1208_REG_SR_RTCF)
778 dev_warn(&client->dev, "rtc power failure detected, "
779 "please set clock.\n");
780
781 if (id->driver_data == TYPE_ISL1219) {
782 struct device_node *np = client->dev.of_node;
783 u32 evienb;
784
785 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
786 if (rc < 0) {
787 dev_err(&client->dev, "failed to read EV reg\n");
788 return rc;
789 }
790 rc |= ISL1219_REG_EV_EVEN;
791 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
792 if (evienb)
793 rc |= ISL1219_REG_EV_EVIENB;
794 else
795 rc &= ~ISL1219_REG_EV_EVIENB;
796 }
797 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
798 if (rc < 0) {
799 dev_err(&client->dev, "could not enable tamper detection\n");
800 return rc;
801 }
802 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
803 if (rc)
804 return rc;
805 evdet_irq = of_irq_get_byname(np, "evdet");
806 }
807
808 rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files);
809 if (rc)
810 return rc;
811
812 if (client->irq > 0)
813 rc = isl1208_setup_irq(client, client->irq);
814 if (rc)
815 return rc;
816
817 if (evdet_irq > 0 && evdet_irq != client->irq)
818 rc = isl1208_setup_irq(client, evdet_irq);
819 if (rc)
820 return rc;
821
822 return rtc_register_device(rtc);
823 }
824
825 static const struct i2c_device_id isl1208_id[] = {
826 { "isl1208", TYPE_ISL1208 },
827 { "isl1218", TYPE_ISL1218 },
828 { "isl1219", TYPE_ISL1219 },
829 { }
830 };
831 MODULE_DEVICE_TABLE(i2c, isl1208_id);
832
833 static const struct of_device_id isl1208_of_match[] = {
834 { .compatible = "isil,isl1208" },
835 { .compatible = "isil,isl1218" },
836 { .compatible = "isil,isl1219" },
837 { }
838 };
839 MODULE_DEVICE_TABLE(of, isl1208_of_match);
840
841 static struct i2c_driver isl1208_driver = {
842 .driver = {
843 .name = "rtc-isl1208",
844 .of_match_table = of_match_ptr(isl1208_of_match),
845 },
846 .probe = isl1208_probe,
847 .id_table = isl1208_id,
848 };
849
850 module_i2c_driver(isl1208_driver);
851
852 MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
853 MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
854 MODULE_LICENSE("GPL");
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