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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux.git] / drivers / rtc / rtc-isl1208.c
CommitLineData
7e56a7dc
HVR		 1/*
2 * Intersil ISL1208 rtc class driver
3 *
4 * Copyright 2005,2006 Hebert Valerio Riedel <[email protected]>
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>
dd35bdb0 17#include "rtc-core.h"
9ece7cd8 18#include <linux/of_irq.h>
7e56a7dc 19
7e56a7dc
HVR		 20/* Register map */
21/* rtc section */
22#define ISL1208_REG_SC 0x00
23#define ISL1208_REG_MN 0x01
24#define ISL1208_REG_HR 0x02
9edae7bc
AZ		 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 */
7e56a7dc
HVR		 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
9edae7bc
AZ		 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 */
dd35bdb0 38#define ISL1208_REG_SR_EVT (1<<3) /* event */
9edae7bc
AZ		 39#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
40#define ISL1208_REG_SR_BAT (1<<1) /* battery */
41#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
7e56a7dc 42#define ISL1208_REG_INT 0x08
cf044f0e
RM		 43#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
44#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
dd35bdb0
MG		 45#define ISL1219_REG_EV 0x09
46#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
cfa30622 47#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
7e56a7dc
HVR		 48#define ISL1208_REG_ATR 0x0a
49#define ISL1208_REG_DTR 0x0b
50
51/* alarm section */
52#define ISL1208_REG_SCA 0x0c
53#define ISL1208_REG_MNA 0x0d
54#define ISL1208_REG_HRA 0x0e
55#define ISL1208_REG_DTA 0x0f
56#define ISL1208_REG_MOA 0x10
57#define ISL1208_REG_DWA 0x11
58#define ISL1208_ALARM_SECTION_LEN 6
59
60/* user section */
61#define ISL1208_REG_USR1 0x12
62#define ISL1208_REG_USR2 0x13
63#define ISL1208_USR_SECTION_LEN 2
64
dd35bdb0
MG		 65/* event section */
66#define ISL1219_REG_SCT 0x14
67#define ISL1219_REG_MNT 0x15
68#define ISL1219_REG_HRT 0x16
69#define ISL1219_REG_DTT 0x17
70#define ISL1219_REG_MOT 0x18
71#define ISL1219_REG_YRT 0x19
72#define ISL1219_EVT_SECTION_LEN 6
73
9edae7bc 74static struct i2c_driver isl1208_driver;
7e56a7dc 75
dd35bdb0
MG		 76/* ISL1208 various variants */
77enum {
78 TYPE_ISL1208 = 0,
79 TYPE_ISL1218,
80 TYPE_ISL1219,
81};
82
7e56a7dc
HVR		 83/* block read */
84static int
85isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
9edae7bc 86 unsigned len)
7e56a7dc
HVR		 87{
88 u8 reg_addr[1] = { reg };
89 struct i2c_msg msgs[2] = {
885ccbb3
S		 90 {
91 .addr = client->addr,
92 .len = sizeof(reg_addr),
93 .buf = reg_addr
94 },
95 {
96 .addr = client->addr,
97 .flags = I2C_M_RD,
98 .len = len,
99 .buf = buf
100 }
7e56a7dc
HVR		 101 };
102 int ret;
103
dd35bdb0
MG		 104 WARN_ON(reg > ISL1219_REG_YRT);
105 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
7e56a7dc
HVR		 106
107 ret = i2c_transfer(client->adapter, msgs, 2);
108 if (ret > 0)
109 ret = 0;
110 return ret;
111}
112
113/* block write */
114static int
115isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
9edae7bc 116 unsigned len)
7e56a7dc
HVR		 117{
118 u8 i2c_buf[ISL1208_REG_USR2 + 2];
119 struct i2c_msg msgs[1] = {
885ccbb3
S		 120 {
121 .addr = client->addr,
122 .len = len + 1,
123 .buf = i2c_buf
124 }
7e56a7dc
HVR		 125 };
126 int ret;
127
dd35bdb0
MG		 128 WARN_ON(reg > ISL1219_REG_YRT);
129 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
7e56a7dc
HVR		 130
131 i2c_buf[0] = reg;
132 memcpy(&i2c_buf[1], &buf[0], len);
133
134 ret = i2c_transfer(client->adapter, msgs, 1);
135 if (ret > 0)
136 ret = 0;
137 return ret;
138}
139
48fc7f7e 140/* simple check to see whether we have a isl1208 */
9edae7bc
AZ		 141static int
142isl1208_i2c_validate_client(struct i2c_client *client)
7e56a7dc
HVR		 143{
144 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
145 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
146 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
147 };
148 int i;
149 int ret;
150
151 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
152 if (ret < 0)
153 return ret;
154
155 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
9edae7bc 156 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
7e56a7dc
HVR		 157 return -ENODEV;
158 }
159
160 return 0;
161}
162
9edae7bc
AZ		 163static int
164isl1208_i2c_get_sr(struct i2c_client *client)
7e56a7dc 165{
c91fd91d 166 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
7e56a7dc
HVR		 167}
168
9edae7bc
AZ		 169static int
170isl1208_i2c_get_atr(struct i2c_client *client)
7e56a7dc
HVR		 171{
172 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
7e56a7dc 173 if (atr < 0)
9edae7bc 174 return atr;
7e56a7dc
HVR		 175
176 /* The 6bit value in the ATR register controls the load
177 * capacitance C_load * in steps of 0.25pF
178 *
179 * bit (1<<5) of the ATR register is inverted
180 *
181 * C_load(ATR=0x20) = 4.50pF
182 * C_load(ATR=0x00) = 12.50pF
183 * C_load(ATR=0x1f) = 20.25pF
184 *
185 */
186
9edae7bc
AZ		 187 atr &= 0x3f; /* mask out lsb */
188 atr ^= 1 << 5; /* invert 6th bit */
189 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
7e56a7dc
HVR		 190
191 return atr;
192}
193
9edae7bc
AZ		 194static int
195isl1208_i2c_get_dtr(struct i2c_client *client)
7e56a7dc
HVR		 196{
197 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
7e56a7dc
HVR		 198 if (dtr < 0)
199 return -EIO;
200
201 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
9edae7bc 202 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
7e56a7dc
HVR		 203
204 return dtr;
205}
206
9edae7bc
AZ		 207static int
208isl1208_i2c_get_usr(struct i2c_client *client)
7e56a7dc
HVR		 209{
210 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
211 int ret;
212
9edae7bc
AZ		 213 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
214 ISL1208_USR_SECTION_LEN);
7e56a7dc
HVR		 215 if (ret < 0)
216 return ret;
217
218 return (buf[1] << 8) | buf[0];
219}
220
9edae7bc
AZ		 221static int
222isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
7e56a7dc
HVR		 223{
224 u8 buf[ISL1208_USR_SECTION_LEN];
225
226 buf[0] = usr & 0xff;
227 buf[1] = (usr >> 8) & 0xff;
228
9edae7bc
AZ		 229 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
230 ISL1208_USR_SECTION_LEN);
7e56a7dc
HVR		 231}
232
cf044f0e
RM		 233static int
234isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
235{
236 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
237
238 if (icr < 0) {
239 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
240 return icr;
241 }
242
243 if (enable)
244 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
245 else
246 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
247
248 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
249 if (icr < 0) {
250 dev_err(&client->dev, "%s: writing INT failed\n", __func__);
251 return icr;
252 }
253
254 return 0;
255}
256
9edae7bc
AZ		 257static int
258isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
7e56a7dc
HVR		 259{
260 struct i2c_client *const client = to_i2c_client(dev);
261 int sr, dtr, atr, usr;
262
263 sr = isl1208_i2c_get_sr(client);
264 if (sr < 0) {
265 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
266 return sr;
267 }
268
269 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
270 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
271 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
272 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
273 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
274 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
9edae7bc 275 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
7e56a7dc
HVR		 276
277 seq_printf(seq, "batt_status\t: %s\n",
278 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
279
280 dtr = isl1208_i2c_get_dtr(client);
9edae7bc 281 if (dtr >= 0 - 1)
7e56a7dc
HVR		 282 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
283
284 atr = isl1208_i2c_get_atr(client);
285 if (atr >= 0)
286 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
9edae7bc 287 atr >> 2, (atr & 0x3) * 25);
7e56a7dc
HVR		 288
289 usr = isl1208_i2c_get_usr(client);
290 if (usr >= 0)
291 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
292
293 return 0;
294}
295
9edae7bc
AZ		 296static int
297isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
7e56a7dc
HVR		 298{
299 int sr;
300 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
301
302 sr = isl1208_i2c_get_sr(client);
303 if (sr < 0) {
304 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
305 return -EIO;
306 }
307
308 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
309 if (sr < 0) {
310 dev_err(&client->dev, "%s: reading RTC section failed\n",
311 __func__);
312 return sr;
313 }
314
fe20ba70
AB		 315 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
316 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
9edae7bc
AZ		 317
318 /* HR field has a more complex interpretation */
319 {
7e56a7dc 320 const u8 _hr = regs[ISL1208_REG_HR];
9edae7bc 321 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
fe20ba70 322 tm->tm_hour = bcd2bin(_hr & 0x3f);
9edae7bc
AZ		 323 else {
324 /* 12h format */
fe20ba70 325 tm->tm_hour = bcd2bin(_hr & 0x1f);
9edae7bc 326 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
7e56a7dc
HVR		 327 tm->tm_hour += 12;
328 }
329 }
330
fe20ba70
AB		 331 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
332 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
333 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
334 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
7e56a7dc
HVR		 335
336 return 0;
337}
338
9edae7bc
AZ		 339static int
340isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
7e56a7dc
HVR		 341{
342 struct rtc_time *const tm = &alarm->time;
343 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
cf044f0e 344 int icr, yr, sr = isl1208_i2c_get_sr(client);
7e56a7dc 345
7e56a7dc
HVR		 346 if (sr < 0) {
347 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
348 return sr;
349 }
350
351 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
9edae7bc 352 ISL1208_ALARM_SECTION_LEN);
7e56a7dc
HVR		 353 if (sr < 0) {
354 dev_err(&client->dev, "%s: reading alarm section failed\n",
355 __func__);
356 return sr;
357 }
358
359 /* MSB of each alarm register is an enable bit */
fe20ba70
AB		 360 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
361 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
362 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
363 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
9edae7bc 364 tm->tm_mon =
fe20ba70
AB		 365 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
366 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
7e56a7dc 367
cf044f0e
RM		 368 /* The alarm doesn't store the year so get it from the rtc section */
369 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
370 if (yr < 0) {
371 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
372 return yr;
373 }
374 tm->tm_year = bcd2bin(yr) + 100;
375
376 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
377 if (icr < 0) {
378 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
379 return icr;
380 }
381 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
382
383 return 0;
384}
385
386static int
387isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
388{
389 struct rtc_time *alarm_tm = &alarm->time;
390 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
391 const int offs = ISL1208_REG_SCA;
cf044f0e
RM		 392 struct rtc_time rtc_tm;
393 int err, enable;
394
395 err = isl1208_i2c_read_time(client, &rtc_tm);
cf044f0e
RM		 396 if (err)
397 return err;
398
399 /* If the alarm time is before the current time disable the alarm */
f118db1e 400 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)
cf044f0e
RM		 401 enable = 0x00;
402 else
403 enable = 0x80;
404
405 /* Program the alarm and enable it for each setting */
406 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
407 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
408 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
409 ISL1208_REG_HR_MIL | enable;
410
411 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
412 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
413 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
414
415 /* write ALARM registers */
416 err = isl1208_i2c_set_regs(client, offs, regs,
417 ISL1208_ALARM_SECTION_LEN);
418 if (err < 0) {
419 dev_err(&client->dev, "%s: writing ALARM section failed\n",
420 __func__);
421 return err;
422 }
423
424 err = isl1208_rtc_toggle_alarm(client, enable);
425 if (err)
426 return err;
427
7e56a7dc
HVR		 428 return 0;
429}
430
9edae7bc
AZ		 431static int
432isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
7e56a7dc
HVR		 433{
434 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
435}
436
9edae7bc
AZ		 437static int
438isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
7e56a7dc
HVR		 439{
440 int sr;
441 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
442
cc6c2ca3
CE		 443 /* The clock has an 8 bit wide bcd-coded register (they never learn)
444 * for the year. tm_year is an offset from 1900 and we are interested
445 * in the 2000-2099 range, so any value less than 100 is invalid.
446 */
447 if (tm->tm_year < 100)
448 return -EINVAL;
449
fe20ba70
AB		 450 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
451 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
452 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
7e56a7dc 453
fe20ba70
AB		 454 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
455 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
456 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
7e56a7dc 457
fe20ba70 458 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
7e56a7dc
HVR		 459
460 sr = isl1208_i2c_get_sr(client);
461 if (sr < 0) {
462 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
463 return sr;
464 }
465
466 /* set WRTC */
9edae7bc 467 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
7e56a7dc
HVR		 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 /* write RTC registers */
475 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
476 if (sr < 0) {
477 dev_err(&client->dev, "%s: writing RTC section failed\n",
478 __func__);
479 return sr;
480 }
481
482 /* clear WRTC again */
5b9fc795
DO		 483 sr = isl1208_i2c_get_sr(client);
484 if (sr < 0) {
485 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
486 return sr;
487 }
9edae7bc 488 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
7e56a7dc
HVR		 489 sr & ~ISL1208_REG_SR_WRTC);
490 if (sr < 0) {
491 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
492 return sr;
493 }
494
495 return 0;
496}
497
498
9edae7bc
AZ		 499static int
500isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
7e56a7dc
HVR		 501{
502 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
503}
504
9edae7bc
AZ		 505static int
506isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
7e56a7dc
HVR		 507{
508 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
509}
510
cf044f0e
RM		 511static int
512isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
513{
514 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
515}
516
dd35bdb0
MG		 517static ssize_t timestamp0_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
520{
521 struct i2c_client *client = dev_get_drvdata(dev);
522 int sr;
523
524 sr = isl1208_i2c_get_sr(client);
525 if (sr < 0) {
526 dev_err(dev, "%s: reading SR failed\n", __func__);
527 return sr;
528 }
529
530 sr &= ~ISL1208_REG_SR_EVT;
531
532 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
533 if (sr < 0)
534 dev_err(dev, "%s: writing SR failed\n",
535 __func__);
536
537 return count;
538};
539
540static ssize_t timestamp0_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542{
543 struct i2c_client *client = dev_get_drvdata(dev);
544 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
545 struct rtc_time tm;
546 int sr;
547
548 sr = isl1208_i2c_get_sr(client);
549 if (sr < 0) {
550 dev_err(dev, "%s: reading SR failed\n", __func__);
551 return sr;
552 }
553
554 if (!(sr & ISL1208_REG_SR_EVT))
555 return 0;
556
557 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,
558 ISL1219_EVT_SECTION_LEN);
559 if (sr < 0) {
560 dev_err(dev, "%s: reading event section failed\n",
561 __func__);
562 return 0;
563 }
564
565 /* MSB of each alarm register is an enable bit */
566 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);
567 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);
568 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);
569 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);
570 tm.tm_mon =
571 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;
572 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;
573
574 sr = rtc_valid_tm(&tm);
575 if (sr)
576 return sr;
577
578 return sprintf(buf, "%llu\n",
579 (unsigned long long)rtc_tm_to_time64(&tm));
580};
581
582static DEVICE_ATTR_RW(timestamp0);
583
cf044f0e
RM		 584static irqreturn_t
585isl1208_rtc_interrupt(int irq, void *data)
586{
587 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
588 struct i2c_client *client = data;
72fca4a4 589 struct rtc_device *rtc = i2c_get_clientdata(client);
cf044f0e
RM		 590 int handled = 0, sr, err;
591
592 /*
593 * I2C reads get NAK'ed if we read straight away after an interrupt?
594 * Using a mdelay/msleep didn't seem to help either, so we work around
595 * this by continually trying to read the register for a short time.
596 */
597 while (1) {
598 sr = isl1208_i2c_get_sr(client);
599 if (sr >= 0)
600 break;
601
602 if (time_after(jiffies, timeout)) {
603 dev_err(&client->dev, "%s: reading SR failed\n",
604 __func__);
605 return sr;
606 }
607 }
608
609 if (sr & ISL1208_REG_SR_ALM) {
610 dev_dbg(&client->dev, "alarm!\n");
611
72fca4a4
JL		 612 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
613
cf044f0e
RM		 614 /* Clear the alarm */
615 sr &= ~ISL1208_REG_SR_ALM;
616 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
617 if (sr < 0)
618 dev_err(&client->dev, "%s: writing SR failed\n",
619 __func__);
620 else
621 handled = 1;
622
623 /* Disable the alarm */
624 err = isl1208_rtc_toggle_alarm(client, 0);
625 if (err)
626 return err;
627 }
628
dd35bdb0
MG		 629 if (sr & ISL1208_REG_SR_EVT) {
630 sysfs_notify(&rtc->dev.kobj, NULL,
631 dev_attr_timestamp0.attr.name);
632 dev_warn(&client->dev, "event detected");
633 handled = 1;
634 }
635
cf044f0e
RM		 636 return handled ? IRQ_HANDLED : IRQ_NONE;
637}
638
ff8371ac 639static const struct rtc_class_ops isl1208_rtc_ops = {
9edae7bc
AZ		 640 .proc = isl1208_rtc_proc,
641 .read_time = isl1208_rtc_read_time,
642 .set_time = isl1208_rtc_set_time,
643 .read_alarm = isl1208_rtc_read_alarm,
cf044f0e 644 .set_alarm = isl1208_rtc_set_alarm,
7e56a7dc
HVR		 645};
646
647/* sysfs interface */
648
9edae7bc
AZ		 649static ssize_t
650isl1208_sysfs_show_atrim(struct device *dev,
651 struct device_attribute *attr, char *buf)
7e56a7dc 652{
9edae7bc 653 int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
7e56a7dc
HVR		 654 if (atr < 0)
655 return atr;
656
9edae7bc 657 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
7e56a7dc 658}
9edae7bc 659
7e56a7dc
HVR		 660static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
661
9edae7bc
AZ		 662static ssize_t
663isl1208_sysfs_show_dtrim(struct device *dev,
664 struct device_attribute *attr, char *buf)
7e56a7dc 665{
9edae7bc 666 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
7e56a7dc
HVR		 667 if (dtr < 0)
668 return dtr;
669
670 return sprintf(buf, "%d ppm\n", dtr);
671}
9edae7bc 672
7e56a7dc
HVR		 673static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
674
9edae7bc
AZ		 675static ssize_t
676isl1208_sysfs_show_usr(struct device *dev,
677 struct device_attribute *attr, char *buf)
7e56a7dc 678{
9edae7bc 679 int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
7e56a7dc
HVR		 680 if (usr < 0)
681 return usr;
682
683 return sprintf(buf, "0x%.4x\n", usr);
684}
685
9edae7bc
AZ		 686static ssize_t
687isl1208_sysfs_store_usr(struct device *dev,
688 struct device_attribute *attr,
689 const char *buf, size_t count)
7e56a7dc
HVR		 690{
691 int usr = -1;
692
693 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
694 if (sscanf(buf, "%x", &usr) != 1)
695 return -EINVAL;
696 } else {
697 if (sscanf(buf, "%d", &usr) != 1)
698 return -EINVAL;
699 }
700
701 if (usr < 0 || usr > 0xffff)
702 return -EINVAL;
703
704 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
705}
9edae7bc 706
7e56a7dc
HVR		 707static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
708 isl1208_sysfs_store_usr);
709
e17ab5cb
HS		 710static struct attribute *isl1208_rtc_attrs[] = {
711 &dev_attr_atrim.attr,
712 &dev_attr_dtrim.attr,
713 &dev_attr_usr.attr,
714 NULL
715};
9edae7bc 716
e17ab5cb
HS		 717static const struct attribute_group isl1208_rtc_sysfs_files = {
718 .attrs = isl1208_rtc_attrs,
719};
9edae7bc 720
dd35bdb0
MG		 721static struct attribute *isl1219_rtc_attrs[] = {
722 &dev_attr_timestamp0.attr,
723 NULL
724};
725
726static const struct attribute_group isl1219_rtc_sysfs_files = {
727 .attrs = isl1219_rtc_attrs,
728};
729
9ece7cd8
DO		 730static int isl1208_setup_irq(struct i2c_client *client, int irq)
731{
732 int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
733 isl1208_rtc_interrupt,
734 IRQF_SHARED | IRQF_ONESHOT,
735 isl1208_driver.driver.name,
736 client);
737 if (!rc) {
738 device_init_wakeup(&client->dev, 1);
739 enable_irq_wake(irq);
740 } else {
741 dev_err(&client->dev,
742 "Unable to request irq %d, no alarm support\n",
743 irq);
744 }
745 return rc;
746}
747
9edae7bc 748static int
d2653e92 749isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
9edae7bc
AZ		 750{
751 int rc = 0;
752 struct rtc_device *rtc;
9ece7cd8 753 int evdet_irq = -1;
7e56a7dc 754
9edae7bc
AZ		 755 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
756 return -ENODEV;
7e56a7dc 757
9edae7bc
AZ		 758 if (isl1208_i2c_validate_client(client) < 0)
759 return -ENODEV;
760
236b7187 761 rtc = devm_rtc_allocate_device(&client->dev);
adce8c14
SK		 762 if (IS_ERR(rtc))
763 return PTR_ERR(rtc);
7e56a7dc 764
236b7187
DO		 765 rtc->ops = &isl1208_rtc_ops;
766
9edae7bc 767 i2c_set_clientdata(client, rtc);
dd35bdb0 768 dev_set_drvdata(&rtc->dev, client);
7e56a7dc 769
9edae7bc 770 rc = isl1208_i2c_get_sr(client);
7e56a7dc 771 if (rc < 0) {
9edae7bc 772 dev_err(&client->dev, "reading status failed\n");
adce8c14 773 return rc;
7e56a7dc
HVR		 774 }
775
776 if (rc & ISL1208_REG_SR_RTCF)
9edae7bc 777 dev_warn(&client->dev, "rtc power failure detected, "
7e56a7dc
HVR		 778 "please set clock.\n");
779
dd35bdb0 780 if (id->driver_data == TYPE_ISL1219) {
cfa30622
DO		 781 struct device_node *np = client->dev.of_node;
782 u32 evienb;
783
784 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
785 if (rc < 0) {
786 dev_err(&client->dev, "failed to read EV reg\n");
787 return rc;
788 }
789 rc |= ISL1219_REG_EV_EVEN;
790 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
791 if (evienb)
792 rc |= ISL1219_REG_EV_EVIENB;
793 else
794 rc &= ~ISL1219_REG_EV_EVIENB;
795 }
796 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
dd35bdb0
MG		 797 if (rc < 0) {
798 dev_err(&client->dev, "could not enable tamper detection\n");
799 return rc;
800 }
801 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
802 if (rc)
803 return rc;
cfa30622 804 evdet_irq = of_irq_get_byname(np, "evdet");
dd35bdb0
MG		 805 }
806
e17ab5cb 807 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
9edae7bc 808 if (rc)
adce8c14 809 return rc;
7e56a7dc 810
9ece7cd8
DO		 811 if (client->irq > 0)
812 rc = isl1208_setup_irq(client, client->irq);
813 if (rc)
814 return rc;
815
816 if (evdet_irq > 0 && evdet_irq != client->irq)
817 rc = isl1208_setup_irq(client, evdet_irq);
818 if (rc)
819 return rc;
9d327c2d 820
236b7187 821 return rtc_register_device(rtc);
7e56a7dc
HVR		 822}
823
824static int
9edae7bc 825isl1208_remove(struct i2c_client *client)
7e56a7dc 826{
e17ab5cb 827 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
7e56a7dc
HVR		 828
829 return 0;
830}
831
3760f736 832static const struct i2c_device_id isl1208_id[] = {
dd35bdb0
MG		 833 { "isl1208", TYPE_ISL1208 },
834 { "isl1218", TYPE_ISL1218 },
835 { "isl1219", TYPE_ISL1219 },
3760f736
JD		 836 { }
837};
838MODULE_DEVICE_TABLE(i2c, isl1208_id);
839
03835504
JMC		 840static const struct of_device_id isl1208_of_match[] = {
841 { .compatible = "isil,isl1208" },
842 { .compatible = "isil,isl1218" },
dd35bdb0 843 { .compatible = "isil,isl1219" },
03835504
JMC		 844 { }
845};
846MODULE_DEVICE_TABLE(of, isl1208_of_match);
847
9edae7bc
AZ		 848static struct i2c_driver isl1208_driver = {
849 .driver = {
03835504
JMC		 850 .name = "rtc-isl1208",
851 .of_match_table = of_match_ptr(isl1208_of_match),
852 },
9edae7bc
AZ		 853 .probe = isl1208_probe,
854 .remove = isl1208_remove,
3760f736 855 .id_table = isl1208_id,
9edae7bc 856};
7e56a7dc 857
0abc9201 858module_i2c_driver(isl1208_driver);
7e56a7dc
HVR		 859
860MODULE_AUTHOR("Herbert Valerio Riedel <[email protected]>");
861MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
862MODULE_LICENSE("GPL");
Empty description
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