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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[linux-2.6-block.git] / drivers / rtc / rtc-isl1208.c
CommitLineData
7e56a7dc
HVR		 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
7e56a7dc 13#include <linux/bcd.h>
4b3a6a3a
AB		 14#include <linux/i2c.h>
15#include <linux/module.h>
9ece7cd8 16#include <linux/of_irq.h>
4b3a6a3a 17#include <linux/rtc.h>
7e56a7dc 18
7e56a7dc
HVR		 19/* Register map */
20/* rtc section */
21#define ISL1208_REG_SC 0x00
22#define ISL1208_REG_MN 0x01
23#define ISL1208_REG_HR 0x02
9edae7bc
AZ		 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 */
7e56a7dc
HVR		 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
9edae7bc
AZ		 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 */
dd35bdb0 37#define ISL1208_REG_SR_EVT (1<<3) /* event */
9edae7bc
AZ		 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 */
7e56a7dc 41#define ISL1208_REG_INT 0x08
cf044f0e
RM		 42#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
43#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
dd35bdb0
MG		 44#define ISL1219_REG_EV 0x09
45#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
cfa30622 46#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
7e56a7dc
HVR		 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
dd35bdb0
MG		 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
9edae7bc 73static struct i2c_driver isl1208_driver;
7e56a7dc 74
dd35bdb0
MG		 75/* ISL1208 various variants */
76enum {
77 TYPE_ISL1208 = 0,
78 TYPE_ISL1218,
79 TYPE_ISL1219,
80};
81
7e56a7dc
HVR		 82/* block read */
83static int
84isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
9edae7bc 85 unsigned len)
7e56a7dc 86{
7e56a7dc
HVR		 87 int ret;
88
dd35bdb0
MG		 89 WARN_ON(reg > ISL1219_REG_YRT);
90 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
7e56a7dc 91
facc23b8
TP		 92 ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
93 return (ret < 0) ? ret : 0;
7e56a7dc
HVR		 94}
95
96/* block write */
97static int
98isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
9edae7bc 99 unsigned len)
7e56a7dc 100{
7e56a7dc
HVR		 101 int ret;
102
dd35bdb0
MG		 103 WARN_ON(reg > ISL1219_REG_YRT);
104 WARN_ON(reg + len > ISL1219_REG_YRT + 1);
7e56a7dc 105
facc23b8
TP		 106 ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf);
107 return (ret < 0) ? ret : 0;
7e56a7dc
HVR		 108}
109
48fc7f7e 110/* simple check to see whether we have a isl1208 */
9edae7bc
AZ		 111static int
112isl1208_i2c_validate_client(struct i2c_client *client)
7e56a7dc
HVR		 113{
114 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
115 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
116 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
117 };
118 int i;
119 int ret;
120
121 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
122 if (ret < 0)
123 return ret;
124
125 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
9edae7bc 126 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
7e56a7dc
HVR		 127 return -ENODEV;
128 }
129
130 return 0;
131}
132
9edae7bc
AZ		 133static int
134isl1208_i2c_get_sr(struct i2c_client *client)
7e56a7dc 135{
c91fd91d 136 return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
7e56a7dc
HVR		 137}
138
9edae7bc
AZ		 139static int
140isl1208_i2c_get_atr(struct i2c_client *client)
7e56a7dc
HVR		 141{
142 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
7e56a7dc 143 if (atr < 0)
9edae7bc 144 return atr;
7e56a7dc
HVR		 145
146 /* The 6bit value in the ATR register controls the load
147 * capacitance C_load * in steps of 0.25pF
148 *
149 * bit (1<<5) of the ATR register is inverted
150 *
151 * C_load(ATR=0x20) = 4.50pF
152 * C_load(ATR=0x00) = 12.50pF
153 * C_load(ATR=0x1f) = 20.25pF
154 *
155 */
156
9edae7bc
AZ		 157 atr &= 0x3f; /* mask out lsb */
158 atr ^= 1 << 5; /* invert 6th bit */
159 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
7e56a7dc
HVR		 160
161 return atr;
162}
163
9edae7bc
AZ		 164static int
165isl1208_i2c_get_dtr(struct i2c_client *client)
7e56a7dc
HVR		 166{
167 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
7e56a7dc
HVR		 168 if (dtr < 0)
169 return -EIO;
170
171 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
9edae7bc 172 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
7e56a7dc
HVR		 173
174 return dtr;
175}
176
9edae7bc
AZ		 177static int
178isl1208_i2c_get_usr(struct i2c_client *client)
7e56a7dc
HVR		 179{
180 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
181 int ret;
182
9edae7bc
AZ		 183 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
184 ISL1208_USR_SECTION_LEN);
7e56a7dc
HVR		 185 if (ret < 0)
186 return ret;
187
188 return (buf[1] << 8) | buf[0];
189}
190
9edae7bc
AZ		 191static int
192isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
7e56a7dc
HVR		 193{
194 u8 buf[ISL1208_USR_SECTION_LEN];
195
196 buf[0] = usr & 0xff;
197 buf[1] = (usr >> 8) & 0xff;
198
9edae7bc
AZ		 199 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
200 ISL1208_USR_SECTION_LEN);
7e56a7dc
HVR		 201}
202
cf044f0e
RM		 203static int
204isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
205{
206 int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
207
208 if (icr < 0) {
209 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
210 return icr;
211 }
212
213 if (enable)
214 icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
215 else
216 icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
217
218 icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
219 if (icr < 0) {
220 dev_err(&client->dev, "%s: writing INT failed\n", __func__);
221 return icr;
222 }
223
224 return 0;
225}
226
9edae7bc
AZ		 227static int
228isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
7e56a7dc
HVR		 229{
230 struct i2c_client *const client = to_i2c_client(dev);
231 int sr, dtr, atr, usr;
232
233 sr = isl1208_i2c_get_sr(client);
234 if (sr < 0) {
235 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
236 return sr;
237 }
238
239 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
240 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
241 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
242 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
243 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
244 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
9edae7bc 245 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
7e56a7dc
HVR		 246
247 seq_printf(seq, "batt_status\t: %s\n",
248 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
249
250 dtr = isl1208_i2c_get_dtr(client);
9edae7bc 251 if (dtr >= 0 - 1)
7e56a7dc
HVR		 252 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
253
254 atr = isl1208_i2c_get_atr(client);
255 if (atr >= 0)
256 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
9edae7bc 257 atr >> 2, (atr & 0x3) * 25);
7e56a7dc
HVR		 258
259 usr = isl1208_i2c_get_usr(client);
260 if (usr >= 0)
261 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
262
263 return 0;
264}
265
9edae7bc
AZ		 266static int
267isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
7e56a7dc
HVR		 268{
269 int sr;
270 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
271
272 sr = isl1208_i2c_get_sr(client);
273 if (sr < 0) {
274 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
275 return -EIO;
276 }
277
278 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
279 if (sr < 0) {
280 dev_err(&client->dev, "%s: reading RTC section failed\n",
281 __func__);
282 return sr;
283 }
284
fe20ba70
AB		 285 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
286 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
9edae7bc
AZ		 287
288 /* HR field has a more complex interpretation */
289 {
7e56a7dc 290 const u8 _hr = regs[ISL1208_REG_HR];
9edae7bc 291 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
fe20ba70 292 tm->tm_hour = bcd2bin(_hr & 0x3f);
9edae7bc
AZ		 293 else {
294 /* 12h format */
fe20ba70 295 tm->tm_hour = bcd2bin(_hr & 0x1f);
9edae7bc 296 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
7e56a7dc
HVR		 297 tm->tm_hour += 12;
298 }
299 }
300
fe20ba70
AB		 301 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
302 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
303 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
304 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
7e56a7dc
HVR		 305
306 return 0;
307}
308
9edae7bc
AZ		 309static int
310isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
7e56a7dc
HVR		 311{
312 struct rtc_time *const tm = &alarm->time;
313 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
cf044f0e 314 int icr, yr, sr = isl1208_i2c_get_sr(client);
7e56a7dc 315
7e56a7dc
HVR		 316 if (sr < 0) {
317 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
318 return sr;
319 }
320
321 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
9edae7bc 322 ISL1208_ALARM_SECTION_LEN);
7e56a7dc
HVR		 323 if (sr < 0) {
324 dev_err(&client->dev, "%s: reading alarm section failed\n",
325 __func__);
326 return sr;
327 }
328
329 /* MSB of each alarm register is an enable bit */
fe20ba70
AB		 330 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
331 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
332 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
333 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
9edae7bc 334 tm->tm_mon =
fe20ba70
AB		 335 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
336 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
7e56a7dc 337
cf044f0e
RM		 338 /* The alarm doesn't store the year so get it from the rtc section */
339 yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
340 if (yr < 0) {
341 dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
342 return yr;
343 }
344 tm->tm_year = bcd2bin(yr) + 100;
345
346 icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
347 if (icr < 0) {
348 dev_err(&client->dev, "%s: reading INT failed\n", __func__);
349 return icr;
350 }
351 alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
352
353 return 0;
354}
355
356static int
357isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
358{
359 struct rtc_time *alarm_tm = &alarm->time;
360 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
361 const int offs = ISL1208_REG_SCA;
cf044f0e
RM		 362 struct rtc_time rtc_tm;
363 int err, enable;
364
365 err = isl1208_i2c_read_time(client, &rtc_tm);
cf044f0e
RM		 366 if (err)
367 return err;
368
369 /* If the alarm time is before the current time disable the alarm */
f118db1e 370 if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)
cf044f0e
RM		 371 enable = 0x00;
372 else
373 enable = 0x80;
374
375 /* Program the alarm and enable it for each setting */
376 regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
377 regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
378 regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
379 ISL1208_REG_HR_MIL | enable;
380
381 regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
382 regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
383 regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
384
385 /* write ALARM registers */
386 err = isl1208_i2c_set_regs(client, offs, regs,
387 ISL1208_ALARM_SECTION_LEN);
388 if (err < 0) {
389 dev_err(&client->dev, "%s: writing ALARM section failed\n",
390 __func__);
391 return err;
392 }
393
394 err = isl1208_rtc_toggle_alarm(client, enable);
395 if (err)
396 return err;
397
7e56a7dc
HVR		 398 return 0;
399}
400
9edae7bc
AZ		 401static int
402isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
7e56a7dc
HVR		 403{
404 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
405}
406
9edae7bc
AZ		 407static int
408isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
7e56a7dc
HVR		 409{
410 int sr;
411 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
412
cc6c2ca3
CE		 413 /* The clock has an 8 bit wide bcd-coded register (they never learn)
414 * for the year. tm_year is an offset from 1900 and we are interested
415 * in the 2000-2099 range, so any value less than 100 is invalid.
416 */
417 if (tm->tm_year < 100)
418 return -EINVAL;
419
fe20ba70
AB		 420 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
421 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
422 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
7e56a7dc 423
fe20ba70
AB		 424 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
425 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
426 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
7e56a7dc 427
fe20ba70 428 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
7e56a7dc
HVR		 429
430 sr = isl1208_i2c_get_sr(client);
431 if (sr < 0) {
432 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
433 return sr;
434 }
435
436 /* set WRTC */
9edae7bc 437 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
7e56a7dc
HVR		 438 sr | ISL1208_REG_SR_WRTC);
439 if (sr < 0) {
440 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
441 return sr;
442 }
443
444 /* write RTC registers */
445 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
446 if (sr < 0) {
447 dev_err(&client->dev, "%s: writing RTC section failed\n",
448 __func__);
449 return sr;
450 }
451
452 /* clear WRTC again */
5b9fc795
DO		 453 sr = isl1208_i2c_get_sr(client);
454 if (sr < 0) {
455 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
456 return sr;
457 }
9edae7bc 458 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
7e56a7dc
HVR		 459 sr & ~ISL1208_REG_SR_WRTC);
460 if (sr < 0) {
461 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
462 return sr;
463 }
464
465 return 0;
466}
467
468
9edae7bc
AZ		 469static int
470isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
7e56a7dc
HVR		 471{
472 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
473}
474
9edae7bc
AZ		 475static int
476isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
7e56a7dc
HVR		 477{
478 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
479}
480
cf044f0e
RM		 481static int
482isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
483{
484 return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
485}
486
dd35bdb0
MG		 487static ssize_t timestamp0_store(struct device *dev,
488 struct device_attribute *attr,
489 const char *buf, size_t count)
490{
1b4c794f 491 struct i2c_client *client = to_i2c_client(dev->parent);
dd35bdb0
MG		 492 int sr;
493
494 sr = isl1208_i2c_get_sr(client);
495 if (sr < 0) {
496 dev_err(dev, "%s: reading SR failed\n", __func__);
497 return sr;
498 }
499
500 sr &= ~ISL1208_REG_SR_EVT;
501
502 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
503 if (sr < 0)
504 dev_err(dev, "%s: writing SR failed\n",
505 __func__);
506
507 return count;
508};
509
510static ssize_t timestamp0_show(struct device *dev,
511 struct device_attribute *attr, char *buf)
512{
1b4c794f 513 struct i2c_client *client = to_i2c_client(dev->parent);
dd35bdb0
MG		 514 u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
515 struct rtc_time tm;
516 int sr;
517
518 sr = isl1208_i2c_get_sr(client);
519 if (sr < 0) {
520 dev_err(dev, "%s: reading SR failed\n", __func__);
521 return sr;
522 }
523
524 if (!(sr & ISL1208_REG_SR_EVT))
525 return 0;
526
527 sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,
528 ISL1219_EVT_SECTION_LEN);
529 if (sr < 0) {
530 dev_err(dev, "%s: reading event section failed\n",
531 __func__);
532 return 0;
533 }
534
535 /* MSB of each alarm register is an enable bit */
536 tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);
537 tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);
538 tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);
539 tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);
540 tm.tm_mon =
541 bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;
542 tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;
543
544 sr = rtc_valid_tm(&tm);
545 if (sr)
546 return sr;
547
548 return sprintf(buf, "%llu\n",
549 (unsigned long long)rtc_tm_to_time64(&tm));
550};
551
552static DEVICE_ATTR_RW(timestamp0);
553
cf044f0e
RM		 554static irqreturn_t
555isl1208_rtc_interrupt(int irq, void *data)
556{
557 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
558 struct i2c_client *client = data;
72fca4a4 559 struct rtc_device *rtc = i2c_get_clientdata(client);
cf044f0e
RM		 560 int handled = 0, sr, err;
561
562 /*
563 * I2C reads get NAK'ed if we read straight away after an interrupt?
564 * Using a mdelay/msleep didn't seem to help either, so we work around
565 * this by continually trying to read the register for a short time.
566 */
567 while (1) {
568 sr = isl1208_i2c_get_sr(client);
569 if (sr >= 0)
570 break;
571
572 if (time_after(jiffies, timeout)) {
573 dev_err(&client->dev, "%s: reading SR failed\n",
574 __func__);
575 return sr;
576 }
577 }
578
579 if (sr & ISL1208_REG_SR_ALM) {
580 dev_dbg(&client->dev, "alarm!\n");
581
72fca4a4
JL		 582 rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
583
cf044f0e
RM		 584 /* Clear the alarm */
585 sr &= ~ISL1208_REG_SR_ALM;
586 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
587 if (sr < 0)
588 dev_err(&client->dev, "%s: writing SR failed\n",
589 __func__);
590 else
591 handled = 1;
592
593 /* Disable the alarm */
594 err = isl1208_rtc_toggle_alarm(client, 0);
595 if (err)
596 return err;
597 }
598
dd35bdb0
MG		 599 if (sr & ISL1208_REG_SR_EVT) {
600 sysfs_notify(&rtc->dev.kobj, NULL,
601 dev_attr_timestamp0.attr.name);
602 dev_warn(&client->dev, "event detected");
603 handled = 1;
604 }
605
cf044f0e
RM		 606 return handled ? IRQ_HANDLED : IRQ_NONE;
607}
608
ff8371ac 609static const struct rtc_class_ops isl1208_rtc_ops = {
9edae7bc
AZ		 610 .proc = isl1208_rtc_proc,
611 .read_time = isl1208_rtc_read_time,
612 .set_time = isl1208_rtc_set_time,
613 .read_alarm = isl1208_rtc_read_alarm,
cf044f0e 614 .set_alarm = isl1208_rtc_set_alarm,
7e56a7dc
HVR		 615};
616
617/* sysfs interface */
618
9edae7bc
AZ		 619static ssize_t
620isl1208_sysfs_show_atrim(struct device *dev,
621 struct device_attribute *attr, char *buf)
7e56a7dc 622{
1b4c794f 623 int atr = isl1208_i2c_get_atr(to_i2c_client(dev->parent));
7e56a7dc
HVR		 624 if (atr < 0)
625 return atr;
626
9edae7bc 627 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
7e56a7dc 628}
9edae7bc 629
7e56a7dc
HVR		 630static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
631
9edae7bc
AZ		 632static ssize_t
633isl1208_sysfs_show_dtrim(struct device *dev,
634 struct device_attribute *attr, char *buf)
7e56a7dc 635{
1b4c794f 636 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev->parent));
7e56a7dc
HVR		 637 if (dtr < 0)
638 return dtr;
639
640 return sprintf(buf, "%d ppm\n", dtr);
641}
9edae7bc 642
7e56a7dc
HVR		 643static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
644
9edae7bc
AZ		 645static ssize_t
646isl1208_sysfs_show_usr(struct device *dev,
647 struct device_attribute *attr, char *buf)
7e56a7dc 648{
1b4c794f 649 int usr = isl1208_i2c_get_usr(to_i2c_client(dev->parent));
7e56a7dc
HVR		 650 if (usr < 0)
651 return usr;
652
653 return sprintf(buf, "0x%.4x\n", usr);
654}
655
9edae7bc
AZ		 656static ssize_t
657isl1208_sysfs_store_usr(struct device *dev,
658 struct device_attribute *attr,
659 const char *buf, size_t count)
7e56a7dc
HVR		 660{
661 int usr = -1;
662
663 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
664 if (sscanf(buf, "%x", &usr) != 1)
665 return -EINVAL;
666 } else {
667 if (sscanf(buf, "%d", &usr) != 1)
668 return -EINVAL;
669 }
670
671 if (usr < 0 || usr > 0xffff)
672 return -EINVAL;
673
1b4c794f
AB		 674 if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr))
675 return -EIO;
676
677 return count;
7e56a7dc 678}
9edae7bc 679
7e56a7dc
HVR		 680static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
681 isl1208_sysfs_store_usr);
682
e17ab5cb
HS		 683static struct attribute *isl1208_rtc_attrs[] = {
684 &dev_attr_atrim.attr,
685 &dev_attr_dtrim.attr,
686 &dev_attr_usr.attr,
687 NULL
688};
9edae7bc 689
e17ab5cb
HS		 690static const struct attribute_group isl1208_rtc_sysfs_files = {
691 .attrs = isl1208_rtc_attrs,
692};
9edae7bc 693
dd35bdb0
MG		 694static struct attribute *isl1219_rtc_attrs[] = {
695 &dev_attr_timestamp0.attr,
696 NULL
697};
698
699static const struct attribute_group isl1219_rtc_sysfs_files = {
700 .attrs = isl1219_rtc_attrs,
701};
702
9ece7cd8
DO		 703static int isl1208_setup_irq(struct i2c_client *client, int irq)
704{
705 int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
706 isl1208_rtc_interrupt,
707 IRQF_SHARED | IRQF_ONESHOT,
708 isl1208_driver.driver.name,
709 client);
710 if (!rc) {
711 device_init_wakeup(&client->dev, 1);
712 enable_irq_wake(irq);
713 } else {
714 dev_err(&client->dev,
715 "Unable to request irq %d, no alarm support\n",
716 irq);
717 }
718 return rc;
719}
720
9edae7bc 721static int
d2653e92 722isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
9edae7bc
AZ		 723{
724 int rc = 0;
725 struct rtc_device *rtc;
9ece7cd8 726 int evdet_irq = -1;
7e56a7dc 727
9edae7bc
AZ		 728 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
729 return -ENODEV;
7e56a7dc 730
9edae7bc
AZ		 731 if (isl1208_i2c_validate_client(client) < 0)
732 return -ENODEV;
733
236b7187 734 rtc = devm_rtc_allocate_device(&client->dev);
adce8c14
SK		 735 if (IS_ERR(rtc))
736 return PTR_ERR(rtc);
7e56a7dc 737
236b7187
DO		 738 rtc->ops = &isl1208_rtc_ops;
739
9edae7bc 740 i2c_set_clientdata(client, rtc);
7e56a7dc 741
9edae7bc 742 rc = isl1208_i2c_get_sr(client);
7e56a7dc 743 if (rc < 0) {
9edae7bc 744 dev_err(&client->dev, "reading status failed\n");
adce8c14 745 return rc;
7e56a7dc
HVR		 746 }
747
748 if (rc & ISL1208_REG_SR_RTCF)
9edae7bc 749 dev_warn(&client->dev, "rtc power failure detected, "
7e56a7dc
HVR		 750 "please set clock.\n");
751
dd35bdb0 752 if (id->driver_data == TYPE_ISL1219) {
cfa30622
DO		 753 struct device_node *np = client->dev.of_node;
754 u32 evienb;
755
756 rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
757 if (rc < 0) {
758 dev_err(&client->dev, "failed to read EV reg\n");
759 return rc;
760 }
761 rc |= ISL1219_REG_EV_EVEN;
762 if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
763 if (evienb)
764 rc |= ISL1219_REG_EV_EVIENB;
765 else
766 rc &= ~ISL1219_REG_EV_EVIENB;
767 }
768 rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
dd35bdb0
MG		 769 if (rc < 0) {
770 dev_err(&client->dev, "could not enable tamper detection\n");
771 return rc;
772 }
773 rc = rtc_add_group(rtc, &isl1219_rtc_sysfs_files);
774 if (rc)
775 return rc;
cfa30622 776 evdet_irq = of_irq_get_byname(np, "evdet");
dd35bdb0
MG		 777 }
778
1b4c794f 779 rc = rtc_add_group(rtc, &isl1208_rtc_sysfs_files);
9edae7bc 780 if (rc)
adce8c14 781 return rc;
7e56a7dc 782
9ece7cd8
DO		 783 if (client->irq > 0)
784 rc = isl1208_setup_irq(client, client->irq);
785 if (rc)
786 return rc;
787
788 if (evdet_irq > 0 && evdet_irq != client->irq)
789 rc = isl1208_setup_irq(client, evdet_irq);
790 if (rc)
791 return rc;
9d327c2d 792
236b7187 793 return rtc_register_device(rtc);
7e56a7dc
HVR		 794}
795
3760f736 796static const struct i2c_device_id isl1208_id[] = {
dd35bdb0
MG		 797 { "isl1208", TYPE_ISL1208 },
798 { "isl1218", TYPE_ISL1218 },
799 { "isl1219", TYPE_ISL1219 },
3760f736
JD		 800 { }
801};
802MODULE_DEVICE_TABLE(i2c, isl1208_id);
803
03835504
JMC		 804static const struct of_device_id isl1208_of_match[] = {
805 { .compatible = "isil,isl1208" },
806 { .compatible = "isil,isl1218" },
dd35bdb0 807 { .compatible = "isil,isl1219" },
03835504
JMC		 808 { }
809};
810MODULE_DEVICE_TABLE(of, isl1208_of_match);
811
9edae7bc
AZ		 812static struct i2c_driver isl1208_driver = {
813 .driver = {
03835504
JMC		 814 .name = "rtc-isl1208",
815 .of_match_table = of_match_ptr(isl1208_of_match),
816 },
9edae7bc 817 .probe = isl1208_probe,
3760f736 818 .id_table = isl1208_id,
9edae7bc 819};
7e56a7dc 820
0abc9201 821module_i2c_driver(isl1208_driver);
7e56a7dc
HVR		 822
823MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
824MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
825MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)