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rtc: ds1307: fix ds1307_native_smbus_read_block_data function
[deliverable/linux.git] / drivers / rtc / rtc-ds1307.c
CommitLineData
1abb0dc9
DB		 1/*
2 * rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips.
3 *
4 * Copyright (C) 2005 James Chapman (ds1337 core)
5 * Copyright (C) 2006 David Brownell
a2166858 6 * Copyright (C) 2009 Matthias Fuchs (rx8025 support)
bc48b902 7 * Copyright (C) 2012 Bertrand Achard (nvram access fixes)
1abb0dc9
DB		 8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
eac7237f
NM		 14#include <linux/bcd.h>
15#include <linux/i2c.h>
1abb0dc9 16#include <linux/init.h>
eac7237f
NM		 17#include <linux/module.h>
18#include <linux/rtc/ds1307.h>
19#include <linux/rtc.h>
1abb0dc9 20#include <linux/slab.h>
1abb0dc9 21#include <linux/string.h>
445c0207
AM		 22#include <linux/hwmon.h>
23#include <linux/hwmon-sysfs.h>
6c6ff145 24#include <linux/clk-provider.h>
1abb0dc9 25
40ce972d
DA		 26/*
27 * We can't determine type by probing, but if we expect pre-Linux code
1abb0dc9
DB		 28 * to have set the chip up as a clock (turning on the oscillator and
29 * setting the date and time), Linux can ignore the non-clock features.
30 * That's a natural job for a factory or repair bench.
1abb0dc9
DB		 31 */
32enum ds_type {
045e0e85
DB		 33 ds_1307,
34 ds_1337,
35 ds_1338,
36 ds_1339,
37 ds_1340,
33df2ee1 38 ds_1388,
97f902b7 39 ds_3231,
045e0e85 40 m41t00,
f4199f85 41 mcp794xx,
a2166858 42 rx_8025,
32d322bc 43 last_ds_type /* always last */
40ce972d 44 /* rs5c372 too? different address... */
1abb0dc9
DB		 45};
46
1abb0dc9
DB		 47
48/* RTC registers don't differ much, except for the century flag */
49#define DS1307_REG_SECS 0x00 /* 00-59 */
50# define DS1307_BIT_CH 0x80
be5f59f4 51# define DS1340_BIT_nEOSC 0x80
f4199f85 52# define MCP794XX_BIT_ST 0x80
1abb0dc9
DB		 53#define DS1307_REG_MIN 0x01 /* 00-59 */
54#define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */
c065f35c
DB		 55# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */
56# define DS1307_BIT_PM 0x20 /* in REG_HOUR */
1abb0dc9
DB		 57# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
58# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
59#define DS1307_REG_WDAY 0x03 /* 01-07 */
f4199f85 60# define MCP794XX_BIT_VBATEN 0x08
1abb0dc9
DB		 61#define DS1307_REG_MDAY 0x04 /* 01-31 */
62#define DS1307_REG_MONTH 0x05 /* 01-12 */
63# define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */
64#define DS1307_REG_YEAR 0x06 /* 00-99 */
65
40ce972d
DA		 66/*
67 * Other registers (control, status, alarms, trickle charge, NVRAM, etc)
045e0e85
DB		 68 * start at 7, and they differ a LOT. Only control and status matter for
69 * basic RTC date and time functionality; be careful using them.
1abb0dc9 70 */
045e0e85 71#define DS1307_REG_CONTROL 0x07 /* or ds1338 */
1abb0dc9 72# define DS1307_BIT_OUT 0x80
be5f59f4 73# define DS1338_BIT_OSF 0x20
1abb0dc9
DB		 74# define DS1307_BIT_SQWE 0x10
75# define DS1307_BIT_RS1 0x02
76# define DS1307_BIT_RS0 0x01
77#define DS1337_REG_CONTROL 0x0e
78# define DS1337_BIT_nEOSC 0x80
cb49a5e9 79# define DS1339_BIT_BBSQI 0x20
97f902b7 80# define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */
1abb0dc9
DB		 81# define DS1337_BIT_RS2 0x10
82# define DS1337_BIT_RS1 0x08
83# define DS1337_BIT_INTCN 0x04
84# define DS1337_BIT_A2IE 0x02
85# define DS1337_BIT_A1IE 0x01
045e0e85
DB		 86#define DS1340_REG_CONTROL 0x07
87# define DS1340_BIT_OUT 0x80
88# define DS1340_BIT_FT 0x40
89# define DS1340_BIT_CALIB_SIGN 0x20
90# define DS1340_M_CALIBRATION 0x1f
be5f59f4
RG		 91#define DS1340_REG_FLAG 0x09
92# define DS1340_BIT_OSF 0x80
1abb0dc9
DB		 93#define DS1337_REG_STATUS 0x0f
94# define DS1337_BIT_OSF 0x80
6c6ff145 95# define DS3231_BIT_EN32KHZ 0x08
1abb0dc9
DB		 96# define DS1337_BIT_A2I 0x02
97# define DS1337_BIT_A1I 0x01
cb49a5e9 98#define DS1339_REG_ALARM1_SECS 0x07
eb86c306
WS		 99
100#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
1abb0dc9 101
a2166858
MF		 102#define RX8025_REG_CTRL1 0x0e
103# define RX8025_BIT_2412 0x20
104#define RX8025_REG_CTRL2 0x0f
105# define RX8025_BIT_PON 0x10
106# define RX8025_BIT_VDET 0x40
107# define RX8025_BIT_XST 0x20
1abb0dc9
DB		 108
109
110struct ds1307 {
33df2ee1 111 u8 offset; /* register's offset */
cb49a5e9 112 u8 regs[11];
9eab0a78
AB		 113 u16 nvram_offset;
114 struct bin_attribute *nvram;
1abb0dc9 115 enum ds_type type;
cb49a5e9
RG		 116 unsigned long flags;
117#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
118#define HAS_ALARM 1 /* bit 1 == irq claimed */
045e0e85 119 struct i2c_client *client;
1abb0dc9 120 struct rtc_device *rtc;
0cc43a18 121 s32 (*read_block_data)(const struct i2c_client *client, u8 command,
30e7b039 122 u8 length, u8 *values);
0cc43a18 123 s32 (*write_block_data)(const struct i2c_client *client, u8 command,
30e7b039 124 u8 length, const u8 *values);
6c6ff145
AM		 125#ifdef CONFIG_COMMON_CLK
126 struct clk_hw clks[2];
127#endif
1abb0dc9
DB		 128};
129
045e0e85 130struct chip_desc {
045e0e85 131 unsigned alarm:1;
9eab0a78
AB		 132 u16 nvram_offset;
133 u16 nvram_size;
eb86c306 134 u16 trickle_charger_reg;
33b04b7b
MV		 135 u8 trickle_charger_setup;
136 u8 (*do_trickle_setup)(struct i2c_client *, uint32_t, bool);
045e0e85
DB		 137};
138
33b04b7b
MV		 139static u8 do_trickle_setup_ds1339(struct i2c_client *,
140 uint32_t ohms, bool diode);
141
142static struct chip_desc chips[last_ds_type] = {
32d322bc 143 [ds_1307] = {
9eab0a78
AB		 144 .nvram_offset = 8,
145 .nvram_size = 56,
32d322bc
WS		 146 },
147 [ds_1337] = {
148 .alarm = 1,
149 },
150 [ds_1338] = {
9eab0a78
AB		 151 .nvram_offset = 8,
152 .nvram_size = 56,
32d322bc
WS		 153 },
154 [ds_1339] = {
155 .alarm = 1,
eb86c306 156 .trickle_charger_reg = 0x10,
33b04b7b 157 .do_trickle_setup = &do_trickle_setup_ds1339,
eb86c306
WS		 158 },
159 [ds_1340] = {
160 .trickle_charger_reg = 0x08,
161 },
162 [ds_1388] = {
163 .trickle_charger_reg = 0x0a,
32d322bc
WS		 164 },
165 [ds_3231] = {
166 .alarm = 1,
167 },
f4199f85 168 [mcp794xx] = {
1d1945d2 169 .alarm = 1,
9eab0a78
AB		 170 /* this is battery backed SRAM */
171 .nvram_offset = 0x20,
172 .nvram_size = 0x40,
173 },
32d322bc 174};
045e0e85 175
3760f736
JD		 176static const struct i2c_device_id ds1307_id[] = {
177 { "ds1307", ds_1307 },
178 { "ds1337", ds_1337 },
179 { "ds1338", ds_1338 },
180 { "ds1339", ds_1339 },
33df2ee1 181 { "ds1388", ds_1388 },
3760f736 182 { "ds1340", ds_1340 },
97f902b7 183 { "ds3231", ds_3231 },
3760f736 184 { "m41t00", m41t00 },
f4199f85
TN		 185 { "mcp7940x", mcp794xx },
186 { "mcp7941x", mcp794xx },
31c1771c 187 { "pt7c4338", ds_1307 },
a2166858 188 { "rx8025", rx_8025 },
3760f736
JD		 189 { }
190};
191MODULE_DEVICE_TABLE(i2c, ds1307_id);
1abb0dc9 192
cb49a5e9
RG		 193/*----------------------------------------------------------------------*/
194
30e7b039
ES		 195#define BLOCK_DATA_MAX_TRIES 10
196
0cc43a18
JD		 197static s32 ds1307_read_block_data_once(const struct i2c_client *client,
198 u8 command, u8 length, u8 *values)
30e7b039
ES		 199{
200 s32 i, data;
201
202 for (i = 0; i < length; i++) {
203 data = i2c_smbus_read_byte_data(client, command + i);
204 if (data < 0)
205 return data;
206 values[i] = data;
207 }
208 return i;
209}
210
0cc43a18 211static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command,
30e7b039
ES		 212 u8 length, u8 *values)
213{
bc48b902 214 u8 oldvalues[255];
30e7b039
ES		 215 s32 ret;
216 int tries = 0;
217
218 dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length);
219 ret = ds1307_read_block_data_once(client, command, length, values);
220 if (ret < 0)
221 return ret;
222 do {
223 if (++tries > BLOCK_DATA_MAX_TRIES) {
224 dev_err(&client->dev,
225 "ds1307_read_block_data failed\n");
226 return -EIO;
227 }
228 memcpy(oldvalues, values, length);
229 ret = ds1307_read_block_data_once(client, command, length,
230 values);
231 if (ret < 0)
232 return ret;
233 } while (memcmp(oldvalues, values, length));
234 return length;
235}
236
0cc43a18 237static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command,
30e7b039
ES		 238 u8 length, const u8 *values)
239{
bc48b902 240 u8 currvalues[255];
30e7b039
ES		 241 int tries = 0;
242
243 dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length);
244 do {
245 s32 i, ret;
246
247 if (++tries > BLOCK_DATA_MAX_TRIES) {
248 dev_err(&client->dev,
249 "ds1307_write_block_data failed\n");
250 return -EIO;
251 }
252 for (i = 0; i < length; i++) {
253 ret = i2c_smbus_write_byte_data(client, command + i,
254 values[i]);
255 if (ret < 0)
256 return ret;
257 }
258 ret = ds1307_read_block_data_once(client, command, length,
259 currvalues);
260 if (ret < 0)
261 return ret;
262 } while (memcmp(currvalues, values, length));
263 return length;
264}
265
266/*----------------------------------------------------------------------*/
267
bc48b902
BA		 268/* These RTC devices are not designed to be connected to a SMbus adapter.
269 SMbus limits block operations length to 32 bytes, whereas it's not
270 limited on I2C buses. As a result, accesses may exceed 32 bytes;
271 in that case, split them into smaller blocks */
272
273static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client,
274 u8 command, u8 length, const u8 *values)
275{
276 u8 suboffset = 0;
277
1d87951c
NB		 278 if (length <= I2C_SMBUS_BLOCK_MAX) {
279 s32 retval = i2c_smbus_write_i2c_block_data(client,
bc48b902 280 command, length, values);
1d87951c
NB		 281 if (retval < 0)
282 return retval;
283 return length;
284 }
bc48b902
BA		 285
286 while (suboffset < length) {
287 s32 retval = i2c_smbus_write_i2c_block_data(client,
288 command + suboffset,
289 min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
290 values + suboffset);
291 if (retval < 0)
292 return retval;
293
294 suboffset += I2C_SMBUS_BLOCK_MAX;
295 }
296 return length;
297}
298
299static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
300 u8 command, u8 length, u8 *values)
301{
302 u8 suboffset = 0;
303
304 if (length <= I2C_SMBUS_BLOCK_MAX)
305 return i2c_smbus_read_i2c_block_data(client,
306 command, length, values);
307
308 while (suboffset < length) {
309 s32 retval = i2c_smbus_read_i2c_block_data(client,
310 command + suboffset,
311 min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
312 values + suboffset);
313 if (retval < 0)
314 return retval;
315
316 suboffset += I2C_SMBUS_BLOCK_MAX;
317 }
318 return length;
319}
320
321/*----------------------------------------------------------------------*/
322
cb49a5e9 323/*
cb49a5e9
RG		 324 * The ds1337 and ds1339 both have two alarms, but we only use the first
325 * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
326 * signal; ds1339 chips have only one alarm signal.
327 */
2fb07a10 328static irqreturn_t ds1307_irq(int irq, void *dev_id)
cb49a5e9 329{
2fb07a10
FB		 330 struct i2c_client *client = dev_id;
331 struct ds1307 *ds1307 = i2c_get_clientdata(client);
332 struct mutex *lock = &ds1307->rtc->ops_lock;
cb49a5e9
RG		 333 int stat, control;
334
cb49a5e9
RG		 335 mutex_lock(lock);
336 stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
337 if (stat < 0)
338 goto out;
339
340 if (stat & DS1337_BIT_A1I) {
341 stat &= ~DS1337_BIT_A1I;
342 i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat);
343
344 control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
345 if (control < 0)
346 goto out;
347
348 control &= ~DS1337_BIT_A1IE;
349 i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
350
cb49a5e9 351 rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
cb49a5e9
RG		 352 }
353
354out:
cb49a5e9 355 mutex_unlock(lock);
cb49a5e9 356
cb49a5e9
RG		 357 return IRQ_HANDLED;
358}
359
360/*----------------------------------------------------------------------*/
361
1abb0dc9
DB		 362static int ds1307_get_time(struct device *dev, struct rtc_time *t)
363{
364 struct ds1307 *ds1307 = dev_get_drvdata(dev);
365 int tmp;
366
045e0e85 367 /* read the RTC date and time registers all at once */
30e7b039 368 tmp = ds1307->read_block_data(ds1307->client,
33df2ee1 369 ds1307->offset, 7, ds1307->regs);
fed40b73 370 if (tmp != 7) {
1abb0dc9
DB		 371 dev_err(dev, "%s error %d\n", "read", tmp);
372 return -EIO;
373 }
374
01a4ca16 375 dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
1abb0dc9 376
fe20ba70
AB		 377 t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f);
378 t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f);
1abb0dc9 379 tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f;
fe20ba70
AB		 380 t->tm_hour = bcd2bin(tmp);
381 t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1;
382 t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f);
1abb0dc9 383 tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f;
fe20ba70 384 t->tm_mon = bcd2bin(tmp) - 1;
1abb0dc9
DB		 385
386 /* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */
fe20ba70 387 t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
1abb0dc9
DB		 388
389 dev_dbg(dev, "%s secs=%d, mins=%d, "
390 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
391 "read", t->tm_sec, t->tm_min,
392 t->tm_hour, t->tm_mday,
393 t->tm_mon, t->tm_year, t->tm_wday);
394
045e0e85
DB		 395 /* initial clock setting can be undefined */
396 return rtc_valid_tm(t);
1abb0dc9
DB		 397}
398
399static int ds1307_set_time(struct device *dev, struct rtc_time *t)
400{
401 struct ds1307 *ds1307 = dev_get_drvdata(dev);
402 int result;
403 int tmp;
404 u8 *buf = ds1307->regs;
405
406 dev_dbg(dev, "%s secs=%d, mins=%d, "
407 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
11966adc
JG		 408 "write", t->tm_sec, t->tm_min,
409 t->tm_hour, t->tm_mday,
410 t->tm_mon, t->tm_year, t->tm_wday);
1abb0dc9 411
fe20ba70
AB		 412 buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
413 buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
414 buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
415 buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
416 buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
417 buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
1abb0dc9
DB		 418
419 /* assume 20YY not 19YY */
420 tmp = t->tm_year - 100;
fe20ba70 421 buf[DS1307_REG_YEAR] = bin2bcd(tmp);
1abb0dc9 422
be5f59f4
RG		 423 switch (ds1307->type) {
424 case ds_1337:
425 case ds_1339:
97f902b7 426 case ds_3231:
1abb0dc9 427 buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
be5f59f4
RG		 428 break;
429 case ds_1340:
1abb0dc9
DB		 430 buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
431 | DS1340_BIT_CENTURY;
be5f59f4 432 break;
f4199f85 433 case mcp794xx:
40ce972d
DA		 434 /*
435 * these bits were cleared when preparing the date/time
436 * values and need to be set again before writing the
437 * buffer out to the device.
438 */
f4199f85
TN		 439 buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
440 buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
43fcb815 441 break;
be5f59f4
RG		 442 default:
443 break;
444 }
1abb0dc9 445
01a4ca16 446 dev_dbg(dev, "%s: %7ph\n", "write", buf);
1abb0dc9 447
33df2ee1
JT		 448 result = ds1307->write_block_data(ds1307->client,
449 ds1307->offset, 7, buf);
fed40b73
BS		 450 if (result < 0) {
451 dev_err(dev, "%s error %d\n", "write", result);
452 return result;
1abb0dc9
DB		 453 }
454 return 0;
455}
456
74d88eb2 457static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
cb49a5e9
RG		 458{
459 struct i2c_client *client = to_i2c_client(dev);
460 struct ds1307 *ds1307 = i2c_get_clientdata(client);
461 int ret;
462
463 if (!test_bit(HAS_ALARM, &ds1307->flags))
464 return -EINVAL;
465
466 /* read all ALARM1, ALARM2, and status registers at once */
30e7b039 467 ret = ds1307->read_block_data(client,
fed40b73
BS		 468 DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
469 if (ret != 9) {
cb49a5e9
RG		 470 dev_err(dev, "%s error %d\n", "alarm read", ret);
471 return -EIO;
472 }
473
ff67abd2
RV		 474 dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read",
475 &ds1307->regs[0], &ds1307->regs[4], &ds1307->regs[7]);
cb49a5e9 476
40ce972d
DA		 477 /*
478 * report alarm time (ALARM1); assume 24 hour and day-of-month modes,
cb49a5e9
RG		 479 * and that all four fields are checked matches
480 */
481 t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
482 t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
483 t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
484 t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
485 t->time.tm_mon = -1;
486 t->time.tm_year = -1;
487 t->time.tm_wday = -1;
488 t->time.tm_yday = -1;
489 t->time.tm_isdst = -1;
490
491 /* ... and status */
492 t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
493 t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
494
495 dev_dbg(dev, "%s secs=%d, mins=%d, "
496 "hours=%d, mday=%d, enabled=%d, pending=%d\n",
497 "alarm read", t->time.tm_sec, t->time.tm_min,
498 t->time.tm_hour, t->time.tm_mday,
499 t->enabled, t->pending);
500
501 return 0;
502}
503
74d88eb2 504static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
cb49a5e9 505{
40ce972d 506 struct i2c_client *client = to_i2c_client(dev);
cb49a5e9
RG		 507 struct ds1307 *ds1307 = i2c_get_clientdata(client);
508 unsigned char *buf = ds1307->regs;
509 u8 control, status;
510 int ret;
511
512 if (!test_bit(HAS_ALARM, &ds1307->flags))
513 return -EINVAL;
514
515 dev_dbg(dev, "%s secs=%d, mins=%d, "
516 "hours=%d, mday=%d, enabled=%d, pending=%d\n",
517 "alarm set", t->time.tm_sec, t->time.tm_min,
518 t->time.tm_hour, t->time.tm_mday,
519 t->enabled, t->pending);
520
521 /* read current status of both alarms and the chip */
30e7b039 522 ret = ds1307->read_block_data(client,
fed40b73
BS		 523 DS1339_REG_ALARM1_SECS, 9, buf);
524 if (ret != 9) {
cb49a5e9
RG		 525 dev_err(dev, "%s error %d\n", "alarm write", ret);
526 return -EIO;
527 }
528 control = ds1307->regs[7];
529 status = ds1307->regs[8];
530
ff67abd2
RV		 531 dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)",
532 &ds1307->regs[0], &ds1307->regs[4], control, status);
cb49a5e9
RG		 533
534 /* set ALARM1, using 24 hour and day-of-month modes */
cb49a5e9
RG		 535 buf[0] = bin2bcd(t->time.tm_sec);
536 buf[1] = bin2bcd(t->time.tm_min);
537 buf[2] = bin2bcd(t->time.tm_hour);
538 buf[3] = bin2bcd(t->time.tm_mday);
539
540 /* set ALARM2 to non-garbage */
541 buf[4] = 0;
542 buf[5] = 0;
543 buf[6] = 0;
544
545 /* optionally enable ALARM1 */
546 buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
547 if (t->enabled) {
548 dev_dbg(dev, "alarm IRQ armed\n");
549 buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */
550 }
551 buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
552
30e7b039 553 ret = ds1307->write_block_data(client,
fed40b73
BS		 554 DS1339_REG_ALARM1_SECS, 9, buf);
555 if (ret < 0) {
cb49a5e9 556 dev_err(dev, "can't set alarm time\n");
fed40b73 557 return ret;
cb49a5e9
RG		 558 }
559
560 return 0;
561}
562
16380c15 563static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
cb49a5e9
RG		 564{
565 struct i2c_client *client = to_i2c_client(dev);
566 struct ds1307 *ds1307 = i2c_get_clientdata(client);
567 int ret;
568
16380c15
JS		 569 if (!test_bit(HAS_ALARM, &ds1307->flags))
570 return -ENOTTY;
cb49a5e9 571
16380c15
JS		 572 ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
573 if (ret < 0)
574 return ret;
cb49a5e9 575
16380c15 576 if (enabled)
cb49a5e9 577 ret |= DS1337_BIT_A1IE;
16380c15
JS		 578 else
579 ret &= ~DS1337_BIT_A1IE;
cb49a5e9 580
16380c15
JS		 581 ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret);
582 if (ret < 0)
583 return ret;
cb49a5e9
RG		 584
585 return 0;
586}
587
ff8371ac 588static const struct rtc_class_ops ds13xx_rtc_ops = {
1abb0dc9
DB		 589 .read_time = ds1307_get_time,
590 .set_time = ds1307_set_time,
74d88eb2
JR		 591 .read_alarm = ds1337_read_alarm,
592 .set_alarm = ds1337_set_alarm,
16380c15 593 .alarm_irq_enable = ds1307_alarm_irq_enable,
1abb0dc9
DB		 594};
595
682d73f6
DB		 596/*----------------------------------------------------------------------*/
597
1d1945d2 598/*
f4199f85 599 * Alarm support for mcp794xx devices.
1d1945d2
SG		 600 */
601
f4199f85
TN		 602#define MCP794XX_REG_CONTROL 0x07
603# define MCP794XX_BIT_ALM0_EN 0x10
604# define MCP794XX_BIT_ALM1_EN 0x20
605#define MCP794XX_REG_ALARM0_BASE 0x0a
606#define MCP794XX_REG_ALARM0_CTRL 0x0d
607#define MCP794XX_REG_ALARM1_BASE 0x11
608#define MCP794XX_REG_ALARM1_CTRL 0x14
609# define MCP794XX_BIT_ALMX_IF (1 << 3)
610# define MCP794XX_BIT_ALMX_C0 (1 << 4)
611# define MCP794XX_BIT_ALMX_C1 (1 << 5)
612# define MCP794XX_BIT_ALMX_C2 (1 << 6)
613# define MCP794XX_BIT_ALMX_POL (1 << 7)
614# define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \
615 MCP794XX_BIT_ALMX_C1 | \
616 MCP794XX_BIT_ALMX_C2)
617
2fb07a10 618static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
1d1945d2 619{
2fb07a10
FB		 620 struct i2c_client *client = dev_id;
621 struct ds1307 *ds1307 = i2c_get_clientdata(client);
622 struct mutex *lock = &ds1307->rtc->ops_lock;
1d1945d2
SG		 623 int reg, ret;
624
2fb07a10 625 mutex_lock(lock);
1d1945d2
SG		 626
627 /* Check and clear alarm 0 interrupt flag. */
f4199f85 628 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL);
1d1945d2
SG		 629 if (reg < 0)
630 goto out;
f4199f85 631 if (!(reg & MCP794XX_BIT_ALMX_IF))
1d1945d2 632 goto out;
f4199f85
TN		 633 reg &= ~MCP794XX_BIT_ALMX_IF;
634 ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_ALARM0_CTRL, reg);
1d1945d2
SG		 635 if (ret < 0)
636 goto out;
637
638 /* Disable alarm 0. */
f4199f85 639 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
1d1945d2
SG		 640 if (reg < 0)
641 goto out;
f4199f85
TN		 642 reg &= ~MCP794XX_BIT_ALM0_EN;
643 ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
1d1945d2
SG		 644 if (ret < 0)
645 goto out;
646
647 rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
648
649out:
2fb07a10
FB		 650 mutex_unlock(lock);
651
652 return IRQ_HANDLED;
1d1945d2
SG		 653}
654
f4199f85 655static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
1d1945d2
SG		 656{
657 struct i2c_client *client = to_i2c_client(dev);
658 struct ds1307 *ds1307 = i2c_get_clientdata(client);
659 u8 *regs = ds1307->regs;
660 int ret;
661
662 if (!test_bit(HAS_ALARM, &ds1307->flags))
663 return -EINVAL;
664
665 /* Read control and alarm 0 registers. */
f4199f85 666 ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
1d1945d2
SG		 667 if (ret < 0)
668 return ret;
669
f4199f85 670 t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
1d1945d2
SG		 671
672 /* Report alarm 0 time assuming 24-hour and day-of-month modes. */
673 t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f);
674 t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f);
675 t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f);
676 t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1;
677 t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f);
678 t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1;
679 t->time.tm_year = -1;
680 t->time.tm_yday = -1;
681 t->time.tm_isdst = -1;
682
683 dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
684 "enabled=%d polarity=%d irq=%d match=%d\n", __func__,
685 t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
686 t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
f4199f85
TN		 687 !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL),
688 !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF),
689 (ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
1d1945d2
SG		 690
691 return 0;
692}
693
f4199f85 694static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
1d1945d2
SG		 695{
696 struct i2c_client *client = to_i2c_client(dev);
697 struct ds1307 *ds1307 = i2c_get_clientdata(client);
698 unsigned char *regs = ds1307->regs;
699 int ret;
700
701 if (!test_bit(HAS_ALARM, &ds1307->flags))
702 return -EINVAL;
703
704 dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
705 "enabled=%d pending=%d\n", __func__,
706 t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
707 t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
708 t->enabled, t->pending);
709
710 /* Read control and alarm 0 registers. */
f4199f85 711 ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
1d1945d2
SG		 712 if (ret < 0)
713 return ret;
714
715 /* Set alarm 0, using 24-hour and day-of-month modes. */
716 regs[3] = bin2bcd(t->time.tm_sec);
717 regs[4] = bin2bcd(t->time.tm_min);
718 regs[5] = bin2bcd(t->time.tm_hour);
62c8c20a 719 regs[6] = bin2bcd(t->time.tm_wday + 1);
1d1945d2 720 regs[7] = bin2bcd(t->time.tm_mday);
62c8c20a 721 regs[8] = bin2bcd(t->time.tm_mon + 1);
1d1945d2
SG		 722
723 /* Clear the alarm 0 interrupt flag. */
f4199f85 724 regs[6] &= ~MCP794XX_BIT_ALMX_IF;
1d1945d2 725 /* Set alarm match: second, minute, hour, day, date, month. */
f4199f85 726 regs[6] |= MCP794XX_MSK_ALMX_MATCH;
e3edd671
NM		 727 /* Disable interrupt. We will not enable until completely programmed */
728 regs[0] &= ~MCP794XX_BIT_ALM0_EN;
1d1945d2 729
f4199f85 730 ret = ds1307->write_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
1d1945d2
SG		 731 if (ret < 0)
732 return ret;
733
e3edd671
NM		 734 if (!t->enabled)
735 return 0;
736 regs[0] |= MCP794XX_BIT_ALM0_EN;
737 return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, regs[0]);
1d1945d2
SG		 738}
739
f4199f85 740static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
1d1945d2
SG		 741{
742 struct i2c_client *client = to_i2c_client(dev);
743 struct ds1307 *ds1307 = i2c_get_clientdata(client);
744 int reg;
745
746 if (!test_bit(HAS_ALARM, &ds1307->flags))
747 return -EINVAL;
748
f4199f85 749 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
1d1945d2
SG		 750 if (reg < 0)
751 return reg;
752
753 if (enabled)
f4199f85 754 reg |= MCP794XX_BIT_ALM0_EN;
1d1945d2 755 else
f4199f85 756 reg &= ~MCP794XX_BIT_ALM0_EN;
1d1945d2 757
f4199f85 758 return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
1d1945d2
SG		 759}
760
f4199f85 761static const struct rtc_class_ops mcp794xx_rtc_ops = {
1d1945d2
SG		 762 .read_time = ds1307_get_time,
763 .set_time = ds1307_set_time,
f4199f85
TN		 764 .read_alarm = mcp794xx_read_alarm,
765 .set_alarm = mcp794xx_set_alarm,
766 .alarm_irq_enable = mcp794xx_alarm_irq_enable,
1d1945d2
SG		 767};
768
769/*----------------------------------------------------------------------*/
770
682d73f6 771static ssize_t
2c3c8bea
CW		 772ds1307_nvram_read(struct file *filp, struct kobject *kobj,
773 struct bin_attribute *attr,
682d73f6
DB		 774 char *buf, loff_t off, size_t count)
775{
776 struct i2c_client *client;
777 struct ds1307 *ds1307;
682d73f6
DB		 778 int result;
779
fcd8db00 780 client = kobj_to_i2c_client(kobj);
682d73f6
DB		 781 ds1307 = i2c_get_clientdata(client);
782
9eab0a78
AB		 783 result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
784 count, buf);
fed40b73 785 if (result < 0)
682d73f6 786 dev_err(&client->dev, "%s error %d\n", "nvram read", result);
fed40b73 787 return result;
682d73f6
DB		 788}
789
790static ssize_t
2c3c8bea
CW		 791ds1307_nvram_write(struct file *filp, struct kobject *kobj,
792 struct bin_attribute *attr,
682d73f6
DB		 793 char *buf, loff_t off, size_t count)
794{
795 struct i2c_client *client;
30e7b039 796 struct ds1307 *ds1307;
fed40b73 797 int result;
682d73f6 798
fcd8db00 799 client = kobj_to_i2c_client(kobj);
30e7b039 800 ds1307 = i2c_get_clientdata(client);
682d73f6 801
9eab0a78
AB		 802 result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
803 count, buf);
fed40b73
BS		 804 if (result < 0) {
805 dev_err(&client->dev, "%s error %d\n", "nvram write", result);
806 return result;
807 }
808 return count;
682d73f6
DB		 809}
810
33b04b7b 811
682d73f6
DB		 812/*----------------------------------------------------------------------*/
813
33b04b7b
MV		 814static u8 do_trickle_setup_ds1339(struct i2c_client *client,
815 uint32_t ohms, bool diode)
816{
817 u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
818 DS1307_TRICKLE_CHARGER_NO_DIODE;
819
820 switch (ohms) {
821 case 250:
822 setup |= DS1307_TRICKLE_CHARGER_250_OHM;
823 break;
824 case 2000:
825 setup |= DS1307_TRICKLE_CHARGER_2K_OHM;
826 break;
827 case 4000:
828 setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
829 break;
830 default:
831 dev_warn(&client->dev,
832 "Unsupported ohm value %u in dt\n", ohms);
833 return 0;
834 }
835 return setup;
836}
837
838static void ds1307_trickle_of_init(struct i2c_client *client,
839 struct chip_desc *chip)
840{
841 uint32_t ohms = 0;
842 bool diode = true;
843
844 if (!chip->do_trickle_setup)
845 goto out;
846 if (of_property_read_u32(client->dev.of_node, "trickle-resistor-ohms" , &ohms))
847 goto out;
848 if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))
849 diode = false;
850 chip->trickle_charger_setup = chip->do_trickle_setup(client,
851 ohms, diode);
852out:
853 return;
854}
855
445c0207
AM		 856/*----------------------------------------------------------------------*/
857
858#ifdef CONFIG_RTC_DRV_DS1307_HWMON
859
860/*
861 * Temperature sensor support for ds3231 devices.
862 */
863
864#define DS3231_REG_TEMPERATURE 0x11
865
866/*
867 * A user-initiated temperature conversion is not started by this function,
868 * so the temperature is updated once every 64 seconds.
869 */
9a3dce62 870static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC)
445c0207
AM		 871{
872 struct ds1307 *ds1307 = dev_get_drvdata(dev);
873 u8 temp_buf[2];
874 s16 temp;
875 int ret;
876
877 ret = ds1307->read_block_data(ds1307->client, DS3231_REG_TEMPERATURE,
878 sizeof(temp_buf), temp_buf);
879 if (ret < 0)
880 return ret;
881 if (ret != sizeof(temp_buf))
882 return -EIO;
883
884 /*
885 * Temperature is represented as a 10-bit code with a resolution of
886 * 0.25 degree celsius and encoded in two's complement format.
887 */
888 temp = (temp_buf[0] << 8) | temp_buf[1];
889 temp >>= 6;
890 *mC = temp * 250;
891
892 return 0;
893}
894
895static ssize_t ds3231_hwmon_show_temp(struct device *dev,
896 struct device_attribute *attr, char *buf)
897{
898 int ret;
9a3dce62 899 s32 temp;
445c0207
AM		 900
901 ret = ds3231_hwmon_read_temp(dev, &temp);
902 if (ret)
903 return ret;
904
905 return sprintf(buf, "%d\n", temp);
906}
907static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp,
908 NULL, 0);
909
910static struct attribute *ds3231_hwmon_attrs[] = {
911 &sensor_dev_attr_temp1_input.dev_attr.attr,
912 NULL,
913};
914ATTRIBUTE_GROUPS(ds3231_hwmon);
915
916static void ds1307_hwmon_register(struct ds1307 *ds1307)
917{
918 struct device *dev;
919
920 if (ds1307->type != ds_3231)
921 return;
922
923 dev = devm_hwmon_device_register_with_groups(&ds1307->client->dev,
924 ds1307->client->name,
925 ds1307, ds3231_hwmon_groups);
926 if (IS_ERR(dev)) {
927 dev_warn(&ds1307->client->dev,
928 "unable to register hwmon device %ld\n", PTR_ERR(dev));
929 }
930}
931
932#else
933
934static void ds1307_hwmon_register(struct ds1307 *ds1307)
935{
936}
937
6c6ff145
AM		 938#endif /* CONFIG_RTC_DRV_DS1307_HWMON */
939
940/*----------------------------------------------------------------------*/
941
942/*
943 * Square-wave output support for DS3231
944 * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3231.pdf
945 */
946#ifdef CONFIG_COMMON_CLK
947
948enum {
949 DS3231_CLK_SQW = 0,
950 DS3231_CLK_32KHZ,
951};
952
953#define clk_sqw_to_ds1307(clk) \
954 container_of(clk, struct ds1307, clks[DS3231_CLK_SQW])
955#define clk_32khz_to_ds1307(clk) \
956 container_of(clk, struct ds1307, clks[DS3231_CLK_32KHZ])
957
958static int ds3231_clk_sqw_rates[] = {
959 1,
960 1024,
961 4096,
962 8192,
963};
964
965static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value)
966{
967 struct i2c_client *client = ds1307->client;
968 struct mutex *lock = &ds1307->rtc->ops_lock;
969 int control;
970 int ret;
971
972 mutex_lock(lock);
973
974 control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
975 if (control < 0) {
976 ret = control;
977 goto out;
978 }
979
980 control &= ~mask;
981 control |= value;
982
983 ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
984out:
985 mutex_unlock(lock);
986
987 return ret;
988}
989
990static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw,
991 unsigned long parent_rate)
992{
993 struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
994 int control;
995 int rate_sel = 0;
996
997 control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL);
998 if (control < 0)
999 return control;
1000 if (control & DS1337_BIT_RS1)
1001 rate_sel += 1;
1002 if (control & DS1337_BIT_RS2)
1003 rate_sel += 2;
1004
1005 return ds3231_clk_sqw_rates[rate_sel];
1006}
1007
1008static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
1009 unsigned long *prate)
1010{
1011 int i;
1012
1013 for (i = ARRAY_SIZE(ds3231_clk_sqw_rates) - 1; i >= 0; i--) {
1014 if (ds3231_clk_sqw_rates[i] <= rate)
1015 return ds3231_clk_sqw_rates[i];
1016 }
1017
1018 return 0;
1019}
1020
1021static int ds3231_clk_sqw_set_rate(struct clk_hw *hw, unsigned long rate,
1022 unsigned long parent_rate)
1023{
1024 struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
1025 int control = 0;
1026 int rate_sel;
1027
1028 for (rate_sel = 0; rate_sel < ARRAY_SIZE(ds3231_clk_sqw_rates);
1029 rate_sel++) {
1030 if (ds3231_clk_sqw_rates[rate_sel] == rate)
1031 break;
1032 }
1033
1034 if (rate_sel == ARRAY_SIZE(ds3231_clk_sqw_rates))
1035 return -EINVAL;
1036
1037 if (rate_sel & 1)
1038 control |= DS1337_BIT_RS1;
1039 if (rate_sel & 2)
1040 control |= DS1337_BIT_RS2;
1041
1042 return ds1337_write_control(ds1307, DS1337_BIT_RS1 | DS1337_BIT_RS2,
1043 control);
1044}
1045
1046static int ds3231_clk_sqw_prepare(struct clk_hw *hw)
1047{
1048 struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
1049
1050 return ds1337_write_control(ds1307, DS1337_BIT_INTCN, 0);
1051}
1052
1053static void ds3231_clk_sqw_unprepare(struct clk_hw *hw)
1054{
1055 struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
1056
1057 ds1337_write_control(ds1307, DS1337_BIT_INTCN, DS1337_BIT_INTCN);
1058}
1059
1060static int ds3231_clk_sqw_is_prepared(struct clk_hw *hw)
1061{
1062 struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw);
1063 int control;
1064
1065 control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL);
1066 if (control < 0)
1067 return control;
1068
1069 return !(control & DS1337_BIT_INTCN);
1070}
1071
1072static const struct clk_ops ds3231_clk_sqw_ops = {
1073 .prepare = ds3231_clk_sqw_prepare,
1074 .unprepare = ds3231_clk_sqw_unprepare,
1075 .is_prepared = ds3231_clk_sqw_is_prepared,
1076 .recalc_rate = ds3231_clk_sqw_recalc_rate,
1077 .round_rate = ds3231_clk_sqw_round_rate,
1078 .set_rate = ds3231_clk_sqw_set_rate,
1079};
1080
1081static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw,
1082 unsigned long parent_rate)
1083{
1084 return 32768;
1085}
1086
1087static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable)
1088{
1089 struct i2c_client *client = ds1307->client;
1090 struct mutex *lock = &ds1307->rtc->ops_lock;
1091 int status;
1092 int ret;
1093
1094 mutex_lock(lock);
1095
1096 status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
1097 if (status < 0) {
1098 ret = status;
1099 goto out;
1100 }
1101
1102 if (enable)
1103 status |= DS3231_BIT_EN32KHZ;
1104 else
1105 status &= ~DS3231_BIT_EN32KHZ;
1106
1107 ret = i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, status);
1108out:
1109 mutex_unlock(lock);
1110
1111 return ret;
1112}
1113
1114static int ds3231_clk_32khz_prepare(struct clk_hw *hw)
1115{
1116 struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw);
1117
1118 return ds3231_clk_32khz_control(ds1307, true);
1119}
1120
1121static void ds3231_clk_32khz_unprepare(struct clk_hw *hw)
1122{
1123 struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw);
1124
1125 ds3231_clk_32khz_control(ds1307, false);
1126}
1127
1128static int ds3231_clk_32khz_is_prepared(struct clk_hw *hw)
1129{
1130 struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw);
1131 int status;
1132
1133 status = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_STATUS);
1134 if (status < 0)
1135 return status;
1136
1137 return !!(status & DS3231_BIT_EN32KHZ);
1138}
1139
1140static const struct clk_ops ds3231_clk_32khz_ops = {
1141 .prepare = ds3231_clk_32khz_prepare,
1142 .unprepare = ds3231_clk_32khz_unprepare,
1143 .is_prepared = ds3231_clk_32khz_is_prepared,
1144 .recalc_rate = ds3231_clk_32khz_recalc_rate,
1145};
1146
1147static struct clk_init_data ds3231_clks_init[] = {
1148 [DS3231_CLK_SQW] = {
1149 .name = "ds3231_clk_sqw",
1150 .ops = &ds3231_clk_sqw_ops,
1151 .flags = CLK_IS_ROOT,
1152 },
1153 [DS3231_CLK_32KHZ] = {
1154 .name = "ds3231_clk_32khz",
1155 .ops = &ds3231_clk_32khz_ops,
1156 .flags = CLK_IS_ROOT,
1157 },
1158};
1159
1160static int ds3231_clks_register(struct ds1307 *ds1307)
1161{
1162 struct i2c_client *client = ds1307->client;
1163 struct device_node *node = client->dev.of_node;
1164 struct clk_onecell_data *onecell;
1165 int i;
1166
1167 onecell = devm_kzalloc(&client->dev, sizeof(*onecell), GFP_KERNEL);
1168 if (!onecell)
1169 return -ENOMEM;
1170
1171 onecell->clk_num = ARRAY_SIZE(ds3231_clks_init);
1172 onecell->clks = devm_kcalloc(&client->dev, onecell->clk_num,
1173 sizeof(onecell->clks[0]), GFP_KERNEL);
1174 if (!onecell->clks)
1175 return -ENOMEM;
1176
1177 for (i = 0; i < ARRAY_SIZE(ds3231_clks_init); i++) {
1178 struct clk_init_data init = ds3231_clks_init[i];
1179
1180 /*
1181 * Interrupt signal due to alarm conditions and square-wave
1182 * output share same pin, so don't initialize both.
1183 */
1184 if (i == DS3231_CLK_SQW && test_bit(HAS_ALARM, &ds1307->flags))
1185 continue;
1186
1187 /* optional override of the clockname */
1188 of_property_read_string_index(node, "clock-output-names", i,
1189 &init.name);
1190 ds1307->clks[i].init = &init;
1191
1192 onecell->clks[i] = devm_clk_register(&client->dev,
1193 &ds1307->clks[i]);
1194 if (IS_ERR(onecell->clks[i]))
1195 return PTR_ERR(onecell->clks[i]);
1196 }
1197
1198 if (!node)
1199 return 0;
1200
1201 of_clk_add_provider(node, of_clk_src_onecell_get, onecell);
1202
1203 return 0;
1204}
1205
1206static void ds1307_clks_register(struct ds1307 *ds1307)
1207{
1208 int ret;
1209
1210 if (ds1307->type != ds_3231)
1211 return;
1212
1213 ret = ds3231_clks_register(ds1307);
1214 if (ret) {
1215 dev_warn(&ds1307->client->dev,
1216 "unable to register clock device %d\n", ret);
1217 }
1218}
1219
1220#else
1221
1222static void ds1307_clks_register(struct ds1307 *ds1307)
1223{
1224}
1225
1226#endif /* CONFIG_COMMON_CLK */
445c0207 1227
5a167f45
GKH		 1228static int ds1307_probe(struct i2c_client *client,
1229 const struct i2c_device_id *id)
1abb0dc9
DB		 1230{
1231 struct ds1307 *ds1307;
1232 int err = -ENODEV;
1abb0dc9 1233 int tmp;
33b04b7b 1234 struct chip_desc *chip = &chips[id->driver_data];
c065f35c 1235 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
c8b18da7 1236 bool want_irq = false;
8bc2a407 1237 bool ds1307_can_wakeup_device = false;
fed40b73 1238 unsigned char *buf;
01ce893d 1239 struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
2fb07a10
FB		 1240 irq_handler_t irq_handler = ds1307_irq;
1241
97f902b7
WS		 1242 static const int bbsqi_bitpos[] = {
1243 [ds_1337] = 0,
1244 [ds_1339] = DS1339_BIT_BBSQI,
1245 [ds_3231] = DS3231_BIT_BBSQW,
1246 };
1d1945d2 1247 const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
1abb0dc9 1248
30e7b039
ES		 1249 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
1250 && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
c065f35c
DB		 1251 return -EIO;
1252
edca66d2 1253 ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
40ce972d 1254 if (!ds1307)
c065f35c 1255 return -ENOMEM;
045e0e85 1256
1abb0dc9 1257 i2c_set_clientdata(client, ds1307);
33df2ee1
JT		 1258
1259 ds1307->client = client;
1260 ds1307->type = id->driver_data;
33df2ee1 1261
33b04b7b
MV		 1262 if (!pdata && client->dev.of_node)
1263 ds1307_trickle_of_init(client, chip);
1264 else if (pdata && pdata->trickle_charger_setup)
1265 chip->trickle_charger_setup = pdata->trickle_charger_setup;
1266
1267 if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
1268 dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n",
1269 DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
1270 chip->trickle_charger_reg);
eb86c306 1271 i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
33b04b7b
MV		 1272 DS13XX_TRICKLE_CHARGER_MAGIC |
1273 chip->trickle_charger_setup);
1274 }
eb86c306 1275
fed40b73 1276 buf = ds1307->regs;
30e7b039 1277 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
bc48b902
BA		 1278 ds1307->read_block_data = ds1307_native_smbus_read_block_data;
1279 ds1307->write_block_data = ds1307_native_smbus_write_block_data;
30e7b039
ES		 1280 } else {
1281 ds1307->read_block_data = ds1307_read_block_data;
1282 ds1307->write_block_data = ds1307_write_block_data;
1283 }
045e0e85 1284
8bc2a407
ML		 1285#ifdef CONFIG_OF
1286/*
1287 * For devices with no IRQ directly connected to the SoC, the RTC chip
1288 * can be forced as a wakeup source by stating that explicitly in
1289 * the device's .dts file using the "wakeup-source" boolean property.
1290 * If the "wakeup-source" property is set, don't request an IRQ.
1291 * This will guarantee the 'wakealarm' sysfs entry is available on the device,
1292 * if supported by the RTC.
1293 */
1294 if (of_property_read_bool(client->dev.of_node, "wakeup-source")) {
1295 ds1307_can_wakeup_device = true;
1296 }
1297#endif
1298
045e0e85
DB		 1299 switch (ds1307->type) {
1300 case ds_1337:
1301 case ds_1339:
97f902b7 1302 case ds_3231:
be5f59f4 1303 /* get registers that the "rtc" read below won't read... */
30e7b039 1304 tmp = ds1307->read_block_data(ds1307->client,
fed40b73 1305 DS1337_REG_CONTROL, 2, buf);
1abb0dc9 1306 if (tmp != 2) {
6df80e21 1307 dev_dbg(&client->dev, "read error %d\n", tmp);
1abb0dc9 1308 err = -EIO;
edca66d2 1309 goto exit;
1abb0dc9
DB		 1310 }
1311
be5f59f4
RG		 1312 /* oscillator off? turn it on, so clock can tick. */
1313 if (ds1307->regs[0] & DS1337_BIT_nEOSC)
cb49a5e9
RG		 1314 ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
1315
40ce972d 1316 /*
8bc2a407
ML		 1317 * Using IRQ or defined as wakeup-source?
1318 * Disable the square wave and both alarms.
97f902b7
WS		 1319 * For some variants, be sure alarms can trigger when we're
1320 * running on Vbackup (BBSQI/BBSQW)
cb49a5e9 1321 */
8bc2a407
ML		 1322 if (chip->alarm && (ds1307->client->irq > 0 ||
1323 ds1307_can_wakeup_device)) {
97f902b7
WS		 1324 ds1307->regs[0] |= DS1337_BIT_INTCN
1325 | bbsqi_bitpos[ds1307->type];
cb49a5e9 1326 ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
b24a7267
WS		 1327
1328 want_irq = true;
cb49a5e9
RG		 1329 }
1330
1331 i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
1332 ds1307->regs[0]);
be5f59f4
RG		 1333
1334 /* oscillator fault? clear flag, and warn */
1335 if (ds1307->regs[1] & DS1337_BIT_OSF) {
1336 i2c_smbus_write_byte_data(client, DS1337_REG_STATUS,
1337 ds1307->regs[1] & ~DS1337_BIT_OSF);
1338 dev_warn(&client->dev, "SET TIME!\n");
1abb0dc9 1339 }
045e0e85 1340 break;
a2166858
MF		 1341
1342 case rx_8025:
1343 tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
1344 RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
1345 if (tmp != 2) {
6df80e21 1346 dev_dbg(&client->dev, "read error %d\n", tmp);
a2166858 1347 err = -EIO;
edca66d2 1348 goto exit;
a2166858
MF		 1349 }
1350
1351 /* oscillator off? turn it on, so clock can tick. */
1352 if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
1353 ds1307->regs[1] |= RX8025_BIT_XST;
1354 i2c_smbus_write_byte_data(client,
1355 RX8025_REG_CTRL2 << 4 | 0x08,
1356 ds1307->regs[1]);
1357 dev_warn(&client->dev,
1358 "oscillator stop detected - SET TIME!\n");
1359 }
1360
1361 if (ds1307->regs[1] & RX8025_BIT_PON) {
1362 ds1307->regs[1] &= ~RX8025_BIT_PON;
1363 i2c_smbus_write_byte_data(client,
1364 RX8025_REG_CTRL2 << 4 | 0x08,
1365 ds1307->regs[1]);
1366 dev_warn(&client->dev, "power-on detected\n");
1367 }
1368
1369 if (ds1307->regs[1] & RX8025_BIT_VDET) {
1370 ds1307->regs[1] &= ~RX8025_BIT_VDET;
1371 i2c_smbus_write_byte_data(client,
1372 RX8025_REG_CTRL2 << 4 | 0x08,
1373 ds1307->regs[1]);
1374 dev_warn(&client->dev, "voltage drop detected\n");
1375 }
1376
1377 /* make sure we are running in 24hour mode */
1378 if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
1379 u8 hour;
1380
1381 /* switch to 24 hour mode */
1382 i2c_smbus_write_byte_data(client,
1383 RX8025_REG_CTRL1 << 4 | 0x08,
1384 ds1307->regs[0] |
1385 RX8025_BIT_2412);
1386
1387 tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
1388 RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
1389 if (tmp != 2) {
6df80e21 1390 dev_dbg(&client->dev, "read error %d\n", tmp);
a2166858 1391 err = -EIO;
edca66d2 1392 goto exit;
a2166858
MF		 1393 }
1394
1395 /* correct hour */
1396 hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
1397 if (hour == 12)
1398 hour = 0;
1399 if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
1400 hour += 12;
1401
1402 i2c_smbus_write_byte_data(client,
1403 DS1307_REG_HOUR << 4 | 0x08,
1404 hour);
1405 }
1406 break;
33df2ee1
JT		 1407 case ds_1388:
1408 ds1307->offset = 1; /* Seconds starts at 1 */
1409 break;
f4199f85
TN		 1410 case mcp794xx:
1411 rtc_ops = &mcp794xx_rtc_ops;
1d1945d2 1412 if (ds1307->client->irq > 0 && chip->alarm) {
2fb07a10 1413 irq_handler = mcp794xx_irq;
1d1945d2
SG		 1414 want_irq = true;
1415 }
1416 break;
045e0e85
DB		 1417 default:
1418 break;
1419 }
1abb0dc9
DB		 1420
1421read_rtc:
1422 /* read RTC registers */
96fc3a45 1423 tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
fed40b73 1424 if (tmp != 8) {
6df80e21 1425 dev_dbg(&client->dev, "read error %d\n", tmp);
1abb0dc9 1426 err = -EIO;
edca66d2 1427 goto exit;
1abb0dc9
DB		 1428 }
1429
40ce972d
DA		 1430 /*
1431 * minimal sanity checking; some chips (like DS1340) don't
1abb0dc9
DB		 1432 * specify the extra bits as must-be-zero, but there are
1433 * still a few values that are clearly out-of-range.
1434 */
1435 tmp = ds1307->regs[DS1307_REG_SECS];
045e0e85
DB		 1436 switch (ds1307->type) {
1437 case ds_1307:
045e0e85 1438 case m41t00:
be5f59f4 1439 /* clock halted? turn it on, so clock can tick. */
045e0e85 1440 if (tmp & DS1307_BIT_CH) {
be5f59f4
RG		 1441 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1442 dev_warn(&client->dev, "SET TIME!\n");
045e0e85 1443 goto read_rtc;
1abb0dc9 1444 }
045e0e85 1445 break;
be5f59f4
RG		 1446 case ds_1338:
1447 /* clock halted? turn it on, so clock can tick. */
045e0e85 1448 if (tmp & DS1307_BIT_CH)
be5f59f4
RG		 1449 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1450
1451 /* oscillator fault? clear flag, and warn */
1452 if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
1453 i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL,
bd16f9eb 1454 ds1307->regs[DS1307_REG_CONTROL]
be5f59f4
RG		 1455 & ~DS1338_BIT_OSF);
1456 dev_warn(&client->dev, "SET TIME!\n");
1457 goto read_rtc;
1458 }
045e0e85 1459 break;
fcd8db00
R		 1460 case ds_1340:
1461 /* clock halted? turn it on, so clock can tick. */
1462 if (tmp & DS1340_BIT_nEOSC)
1463 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1464
1465 tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
1466 if (tmp < 0) {
6df80e21 1467 dev_dbg(&client->dev, "read error %d\n", tmp);
fcd8db00 1468 err = -EIO;
edca66d2 1469 goto exit;
fcd8db00
R		 1470 }
1471
1472 /* oscillator fault? clear flag, and warn */
1473 if (tmp & DS1340_BIT_OSF) {
1474 i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
1475 dev_warn(&client->dev, "SET TIME!\n");
1476 }
43fcb815 1477 break;
f4199f85 1478 case mcp794xx:
43fcb815 1479 /* make sure that the backup battery is enabled */
f4199f85 1480 if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
43fcb815
DA		 1481 i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
1482 ds1307->regs[DS1307_REG_WDAY]
f4199f85 1483 | MCP794XX_BIT_VBATEN);
43fcb815
DA		 1484 }
1485
1486 /* clock halted? turn it on, so clock can tick. */
f4199f85 1487 if (!(tmp & MCP794XX_BIT_ST)) {
43fcb815 1488 i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
f4199f85 1489 MCP794XX_BIT_ST);
43fcb815
DA		 1490 dev_warn(&client->dev, "SET TIME!\n");
1491 goto read_rtc;
1492 }
1493
fcd8db00 1494 break;
32d322bc 1495 default:
045e0e85 1496 break;
1abb0dc9 1497 }
045e0e85 1498
1abb0dc9 1499 tmp = ds1307->regs[DS1307_REG_HOUR];
c065f35c
DB		 1500 switch (ds1307->type) {
1501 case ds_1340:
1502 case m41t00:
40ce972d
DA		 1503 /*
1504 * NOTE: ignores century bits; fix before deploying
c065f35c
DB		 1505 * systems that will run through year 2100.
1506 */
1507 break;
a2166858
MF		 1508 case rx_8025:
1509 break;
c065f35c
DB		 1510 default:
1511 if (!(tmp & DS1307_BIT_12HR))
1512 break;
1513
40ce972d
DA		 1514 /*
1515 * Be sure we're in 24 hour mode. Multi-master systems
c065f35c
DB		 1516 * take note...
1517 */
fe20ba70 1518 tmp = bcd2bin(tmp & 0x1f);
c065f35c
DB		 1519 if (tmp == 12)
1520 tmp = 0;
1521 if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
1522 tmp += 12;
1abb0dc9 1523 i2c_smbus_write_byte_data(client,
96fc3a45 1524 ds1307->offset + DS1307_REG_HOUR,
fe20ba70 1525 bin2bcd(tmp));
1abb0dc9
DB		 1526 }
1527
3abb1ada
SG		 1528 if (want_irq) {
1529 device_set_wakeup_capable(&client->dev, true);
1530 set_bit(HAS_ALARM, &ds1307->flags);
1531 }
edca66d2 1532 ds1307->rtc = devm_rtc_device_register(&client->dev, client->name,
1d1945d2 1533 rtc_ops, THIS_MODULE);
1abb0dc9 1534 if (IS_ERR(ds1307->rtc)) {
4071ea25 1535 return PTR_ERR(ds1307->rtc);
1abb0dc9
DB		 1536 }
1537
38a7a73e 1538 if (ds1307_can_wakeup_device && ds1307->client->irq <= 0) {
8bc2a407
ML		 1539 /* Disable request for an IRQ */
1540 want_irq = false;
1541 dev_info(&client->dev, "'wakeup-source' is set, request for an IRQ is disabled!\n");
1542 /* We cannot support UIE mode if we do not have an IRQ line */
1543 ds1307->rtc->uie_unsupported = 1;
1544 }
1545
cb49a5e9 1546 if (want_irq) {
c5983191
NM		 1547 err = devm_request_threaded_irq(&client->dev,
1548 client->irq, NULL, irq_handler,
1549 IRQF_SHARED | IRQF_ONESHOT,
1550 ds1307->rtc->name, client);
cb49a5e9 1551 if (err) {
4071ea25 1552 client->irq = 0;
3abb1ada
SG		 1553 device_set_wakeup_capable(&client->dev, false);
1554 clear_bit(HAS_ALARM, &ds1307->flags);
4071ea25 1555 dev_err(&client->dev, "unable to request IRQ!\n");
3abb1ada 1556 } else
51c4cfef 1557 dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
cb49a5e9
RG		 1558 }
1559
9eab0a78 1560 if (chip->nvram_size) {
4071ea25 1561
edca66d2
JH		 1562 ds1307->nvram = devm_kzalloc(&client->dev,
1563 sizeof(struct bin_attribute),
1564 GFP_KERNEL);
9eab0a78 1565 if (!ds1307->nvram) {
4071ea25
AZ		 1566 dev_err(&client->dev, "cannot allocate memory for nvram sysfs\n");
1567 } else {
1568
1569 ds1307->nvram->attr.name = "nvram";
1570 ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR;
1571
1572 sysfs_bin_attr_init(ds1307->nvram);
1573
1574 ds1307->nvram->read = ds1307_nvram_read;
1575 ds1307->nvram->write = ds1307_nvram_write;
1576 ds1307->nvram->size = chip->nvram_size;
1577 ds1307->nvram_offset = chip->nvram_offset;
1578
1579 err = sysfs_create_bin_file(&client->dev.kobj,
1580 ds1307->nvram);
1581 if (err) {
1582 dev_err(&client->dev,
1583 "unable to create sysfs file: %s\n",
1584 ds1307->nvram->attr.name);
1585 } else {
1586 set_bit(HAS_NVRAM, &ds1307->flags);
1587 dev_info(&client->dev, "%zu bytes nvram\n",
1588 ds1307->nvram->size);
1589 }
9eab0a78 1590 }
682d73f6
DB		 1591 }
1592
445c0207 1593 ds1307_hwmon_register(ds1307);
6c6ff145 1594 ds1307_clks_register(ds1307);
445c0207 1595
1abb0dc9
DB		 1596 return 0;
1597
edca66d2 1598exit:
1abb0dc9
DB		 1599 return err;
1600}
1601
5a167f45 1602static int ds1307_remove(struct i2c_client *client)
1abb0dc9 1603{
40ce972d 1604 struct ds1307 *ds1307 = i2c_get_clientdata(client);
cb49a5e9 1605
edca66d2 1606 if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags))
9eab0a78 1607 sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);
682d73f6 1608
1abb0dc9
DB		 1609 return 0;
1610}
1611
1612static struct i2c_driver ds1307_driver = {
1613 .driver = {
c065f35c 1614 .name = "rtc-ds1307",
1abb0dc9 1615 },
c065f35c 1616 .probe = ds1307_probe,
5a167f45 1617 .remove = ds1307_remove,
3760f736 1618 .id_table = ds1307_id,
1abb0dc9
DB		 1619};
1620
0abc9201 1621module_i2c_driver(ds1307_driver);
1abb0dc9
DB		 1622
1623MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips");
1624MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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