blob: 6e76de1856fc14c6ae5168cf0980735ec02d5550 [file] [log] [blame]
David Brownell1abb0dc2006-06-25 05:48:17 -07001/*
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
Matthias Fuchsa2166852009-03-31 15:24:58 -07006 * Copyright (C) 2009 Matthias Fuchs (rx8025 support)
Bertrand Achardbc48b902013-04-29 16:19:26 -07007 * Copyright (C) 2012 Bertrand Achard (nvram access fixes)
David Brownell1abb0dc2006-06-25 05:48:17 -07008 *
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
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <linux/i2c.h>
18#include <linux/string.h>
19#include <linux/rtc.h>
20#include <linux/bcd.h>
Wolfram Sangeb86c302012-05-29 15:07:38 -070021#include <linux/rtc/ds1307.h>
David Brownell1abb0dc2006-06-25 05:48:17 -070022
David Anders40ce9722012-03-23 15:02:37 -070023/*
24 * We can't determine type by probing, but if we expect pre-Linux code
David Brownell1abb0dc2006-06-25 05:48:17 -070025 * to have set the chip up as a clock (turning on the oscillator and
26 * setting the date and time), Linux can ignore the non-clock features.
27 * That's a natural job for a factory or repair bench.
David Brownell1abb0dc2006-06-25 05:48:17 -070028 */
29enum ds_type {
David Brownell045e0e82007-07-17 04:04:55 -070030 ds_1307,
31 ds_1337,
32 ds_1338,
33 ds_1339,
34 ds_1340,
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -070035 ds_1388,
Wolfram Sang97f902b2009-06-17 16:26:10 -070036 ds_3231,
David Brownell045e0e82007-07-17 04:04:55 -070037 m41t00,
Tomas Novotnyf4199f82014-12-10 15:53:57 -080038 mcp794xx,
Matthias Fuchsa2166852009-03-31 15:24:58 -070039 rx_8025,
Wolfram Sang32d322b2012-03-23 15:02:36 -070040 last_ds_type /* always last */
David Anders40ce9722012-03-23 15:02:37 -070041 /* rs5c372 too? different address... */
David Brownell1abb0dc2006-06-25 05:48:17 -070042};
43
David Brownell1abb0dc2006-06-25 05:48:17 -070044
45/* RTC registers don't differ much, except for the century flag */
46#define DS1307_REG_SECS 0x00 /* 00-59 */
47# define DS1307_BIT_CH 0x80
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -070048# define DS1340_BIT_nEOSC 0x80
Tomas Novotnyf4199f82014-12-10 15:53:57 -080049# define MCP794XX_BIT_ST 0x80
David Brownell1abb0dc2006-06-25 05:48:17 -070050#define DS1307_REG_MIN 0x01 /* 00-59 */
51#define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */
David Brownellc065f352007-07-17 04:05:10 -070052# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */
53# define DS1307_BIT_PM 0x20 /* in REG_HOUR */
David Brownell1abb0dc2006-06-25 05:48:17 -070054# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
55# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
56#define DS1307_REG_WDAY 0x03 /* 01-07 */
Tomas Novotnyf4199f82014-12-10 15:53:57 -080057# define MCP794XX_BIT_VBATEN 0x08
David Brownell1abb0dc2006-06-25 05:48:17 -070058#define DS1307_REG_MDAY 0x04 /* 01-31 */
59#define DS1307_REG_MONTH 0x05 /* 01-12 */
60# define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */
61#define DS1307_REG_YEAR 0x06 /* 00-99 */
62
David Anders40ce9722012-03-23 15:02:37 -070063/*
64 * Other registers (control, status, alarms, trickle charge, NVRAM, etc)
David Brownell045e0e82007-07-17 04:04:55 -070065 * start at 7, and they differ a LOT. Only control and status matter for
66 * basic RTC date and time functionality; be careful using them.
David Brownell1abb0dc2006-06-25 05:48:17 -070067 */
David Brownell045e0e82007-07-17 04:04:55 -070068#define DS1307_REG_CONTROL 0x07 /* or ds1338 */
David Brownell1abb0dc2006-06-25 05:48:17 -070069# define DS1307_BIT_OUT 0x80
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -070070# define DS1338_BIT_OSF 0x20
David Brownell1abb0dc2006-06-25 05:48:17 -070071# define DS1307_BIT_SQWE 0x10
72# define DS1307_BIT_RS1 0x02
73# define DS1307_BIT_RS0 0x01
74#define DS1337_REG_CONTROL 0x0e
75# define DS1337_BIT_nEOSC 0x80
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -070076# define DS1339_BIT_BBSQI 0x20
Wolfram Sang97f902b2009-06-17 16:26:10 -070077# define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */
David Brownell1abb0dc2006-06-25 05:48:17 -070078# define DS1337_BIT_RS2 0x10
79# define DS1337_BIT_RS1 0x08
80# define DS1337_BIT_INTCN 0x04
81# define DS1337_BIT_A2IE 0x02
82# define DS1337_BIT_A1IE 0x01
David Brownell045e0e82007-07-17 04:04:55 -070083#define DS1340_REG_CONTROL 0x07
84# define DS1340_BIT_OUT 0x80
85# define DS1340_BIT_FT 0x40
86# define DS1340_BIT_CALIB_SIGN 0x20
87# define DS1340_M_CALIBRATION 0x1f
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -070088#define DS1340_REG_FLAG 0x09
89# define DS1340_BIT_OSF 0x80
David Brownell1abb0dc2006-06-25 05:48:17 -070090#define DS1337_REG_STATUS 0x0f
91# define DS1337_BIT_OSF 0x80
92# define DS1337_BIT_A2I 0x02
93# define DS1337_BIT_A1I 0x01
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -070094#define DS1339_REG_ALARM1_SECS 0x07
Wolfram Sangeb86c302012-05-29 15:07:38 -070095
96#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
David Brownell1abb0dc2006-06-25 05:48:17 -070097
Matthias Fuchsa2166852009-03-31 15:24:58 -070098#define RX8025_REG_CTRL1 0x0e
99# define RX8025_BIT_2412 0x20
100#define RX8025_REG_CTRL2 0x0f
101# define RX8025_BIT_PON 0x10
102# define RX8025_BIT_VDET 0x40
103# define RX8025_BIT_XST 0x20
David Brownell1abb0dc2006-06-25 05:48:17 -0700104
105
106struct ds1307 {
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700107 u8 offset; /* register's offset */
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700108 u8 regs[11];
Austin Boyle9eab0a72012-03-23 15:02:38 -0700109 u16 nvram_offset;
110 struct bin_attribute *nvram;
David Brownell1abb0dc2006-06-25 05:48:17 -0700111 enum ds_type type;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700112 unsigned long flags;
113#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
114#define HAS_ALARM 1 /* bit 1 == irq claimed */
David Brownell045e0e82007-07-17 04:04:55 -0700115 struct i2c_client *client;
David Brownell1abb0dc2006-06-25 05:48:17 -0700116 struct rtc_device *rtc;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700117 struct work_struct work;
Jean Delvare0cc43a12011-01-10 22:11:23 +0100118 s32 (*read_block_data)(const struct i2c_client *client, u8 command,
Ed Swierk30e7b032009-03-31 15:24:56 -0700119 u8 length, u8 *values);
Jean Delvare0cc43a12011-01-10 22:11:23 +0100120 s32 (*write_block_data)(const struct i2c_client *client, u8 command,
Ed Swierk30e7b032009-03-31 15:24:56 -0700121 u8 length, const u8 *values);
David Brownell1abb0dc2006-06-25 05:48:17 -0700122};
123
David Brownell045e0e82007-07-17 04:04:55 -0700124struct chip_desc {
David Brownell045e0e82007-07-17 04:04:55 -0700125 unsigned alarm:1;
Austin Boyle9eab0a72012-03-23 15:02:38 -0700126 u16 nvram_offset;
127 u16 nvram_size;
Wolfram Sangeb86c302012-05-29 15:07:38 -0700128 u16 trickle_charger_reg;
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700129 u8 trickle_charger_setup;
130 u8 (*do_trickle_setup)(struct i2c_client *, uint32_t, bool);
David Brownell045e0e82007-07-17 04:04:55 -0700131};
132
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700133static u8 do_trickle_setup_ds1339(struct i2c_client *,
134 uint32_t ohms, bool diode);
135
136static struct chip_desc chips[last_ds_type] = {
Wolfram Sang32d322b2012-03-23 15:02:36 -0700137 [ds_1307] = {
Austin Boyle9eab0a72012-03-23 15:02:38 -0700138 .nvram_offset = 8,
139 .nvram_size = 56,
Wolfram Sang32d322b2012-03-23 15:02:36 -0700140 },
141 [ds_1337] = {
142 .alarm = 1,
143 },
144 [ds_1338] = {
Austin Boyle9eab0a72012-03-23 15:02:38 -0700145 .nvram_offset = 8,
146 .nvram_size = 56,
Wolfram Sang32d322b2012-03-23 15:02:36 -0700147 },
148 [ds_1339] = {
149 .alarm = 1,
Wolfram Sangeb86c302012-05-29 15:07:38 -0700150 .trickle_charger_reg = 0x10,
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700151 .do_trickle_setup = &do_trickle_setup_ds1339,
Wolfram Sangeb86c302012-05-29 15:07:38 -0700152 },
153 [ds_1340] = {
154 .trickle_charger_reg = 0x08,
155 },
156 [ds_1388] = {
157 .trickle_charger_reg = 0x0a,
Wolfram Sang32d322b2012-03-23 15:02:36 -0700158 },
159 [ds_3231] = {
160 .alarm = 1,
161 },
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800162 [mcp794xx] = {
Simon Guinot1d1945d2014-04-03 14:49:55 -0700163 .alarm = 1,
Austin Boyle9eab0a72012-03-23 15:02:38 -0700164 /* this is battery backed SRAM */
165 .nvram_offset = 0x20,
166 .nvram_size = 0x40,
167 },
Wolfram Sang32d322b2012-03-23 15:02:36 -0700168};
David Brownell045e0e82007-07-17 04:04:55 -0700169
Jean Delvare3760f732008-04-29 23:11:40 +0200170static const struct i2c_device_id ds1307_id[] = {
171 { "ds1307", ds_1307 },
172 { "ds1337", ds_1337 },
173 { "ds1338", ds_1338 },
174 { "ds1339", ds_1339 },
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700175 { "ds1388", ds_1388 },
Jean Delvare3760f732008-04-29 23:11:40 +0200176 { "ds1340", ds_1340 },
Wolfram Sang97f902b2009-06-17 16:26:10 -0700177 { "ds3231", ds_3231 },
Jean Delvare3760f732008-04-29 23:11:40 +0200178 { "m41t00", m41t00 },
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800179 { "mcp7940x", mcp794xx },
180 { "mcp7941x", mcp794xx },
Priyanka Jain31c17712011-06-27 16:18:04 -0700181 { "pt7c4338", ds_1307 },
Matthias Fuchsa2166852009-03-31 15:24:58 -0700182 { "rx8025", rx_8025 },
Jean Delvare3760f732008-04-29 23:11:40 +0200183 { }
184};
185MODULE_DEVICE_TABLE(i2c, ds1307_id);
David Brownell1abb0dc2006-06-25 05:48:17 -0700186
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700187/*----------------------------------------------------------------------*/
188
Ed Swierk30e7b032009-03-31 15:24:56 -0700189#define BLOCK_DATA_MAX_TRIES 10
190
Jean Delvare0cc43a12011-01-10 22:11:23 +0100191static s32 ds1307_read_block_data_once(const struct i2c_client *client,
192 u8 command, u8 length, u8 *values)
Ed Swierk30e7b032009-03-31 15:24:56 -0700193{
194 s32 i, data;
195
196 for (i = 0; i < length; i++) {
197 data = i2c_smbus_read_byte_data(client, command + i);
198 if (data < 0)
199 return data;
200 values[i] = data;
201 }
202 return i;
203}
204
Jean Delvare0cc43a12011-01-10 22:11:23 +0100205static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command,
Ed Swierk30e7b032009-03-31 15:24:56 -0700206 u8 length, u8 *values)
207{
Bertrand Achardbc48b902013-04-29 16:19:26 -0700208 u8 oldvalues[255];
Ed Swierk30e7b032009-03-31 15:24:56 -0700209 s32 ret;
210 int tries = 0;
211
212 dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length);
213 ret = ds1307_read_block_data_once(client, command, length, values);
214 if (ret < 0)
215 return ret;
216 do {
217 if (++tries > BLOCK_DATA_MAX_TRIES) {
218 dev_err(&client->dev,
219 "ds1307_read_block_data failed\n");
220 return -EIO;
221 }
222 memcpy(oldvalues, values, length);
223 ret = ds1307_read_block_data_once(client, command, length,
224 values);
225 if (ret < 0)
226 return ret;
227 } while (memcmp(oldvalues, values, length));
228 return length;
229}
230
Jean Delvare0cc43a12011-01-10 22:11:23 +0100231static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command,
Ed Swierk30e7b032009-03-31 15:24:56 -0700232 u8 length, const u8 *values)
233{
Bertrand Achardbc48b902013-04-29 16:19:26 -0700234 u8 currvalues[255];
Ed Swierk30e7b032009-03-31 15:24:56 -0700235 int tries = 0;
236
237 dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length);
238 do {
239 s32 i, ret;
240
241 if (++tries > BLOCK_DATA_MAX_TRIES) {
242 dev_err(&client->dev,
243 "ds1307_write_block_data failed\n");
244 return -EIO;
245 }
246 for (i = 0; i < length; i++) {
247 ret = i2c_smbus_write_byte_data(client, command + i,
248 values[i]);
249 if (ret < 0)
250 return ret;
251 }
252 ret = ds1307_read_block_data_once(client, command, length,
253 currvalues);
254 if (ret < 0)
255 return ret;
256 } while (memcmp(currvalues, values, length));
257 return length;
258}
259
260/*----------------------------------------------------------------------*/
261
Bertrand Achardbc48b902013-04-29 16:19:26 -0700262/* These RTC devices are not designed to be connected to a SMbus adapter.
263 SMbus limits block operations length to 32 bytes, whereas it's not
264 limited on I2C buses. As a result, accesses may exceed 32 bytes;
265 in that case, split them into smaller blocks */
266
267static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client,
268 u8 command, u8 length, const u8 *values)
269{
270 u8 suboffset = 0;
271
272 if (length <= I2C_SMBUS_BLOCK_MAX)
273 return i2c_smbus_write_i2c_block_data(client,
274 command, length, values);
275
276 while (suboffset < length) {
277 s32 retval = i2c_smbus_write_i2c_block_data(client,
278 command + suboffset,
279 min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
280 values + suboffset);
281 if (retval < 0)
282 return retval;
283
284 suboffset += I2C_SMBUS_BLOCK_MAX;
285 }
286 return length;
287}
288
289static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
290 u8 command, u8 length, u8 *values)
291{
292 u8 suboffset = 0;
293
294 if (length <= I2C_SMBUS_BLOCK_MAX)
295 return i2c_smbus_read_i2c_block_data(client,
296 command, length, values);
297
298 while (suboffset < length) {
299 s32 retval = i2c_smbus_read_i2c_block_data(client,
300 command + suboffset,
301 min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
302 values + suboffset);
303 if (retval < 0)
304 return retval;
305
306 suboffset += I2C_SMBUS_BLOCK_MAX;
307 }
308 return length;
309}
310
311/*----------------------------------------------------------------------*/
312
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700313/*
314 * The IRQ logic includes a "real" handler running in IRQ context just
315 * long enough to schedule this workqueue entry. We need a task context
316 * to talk to the RTC, since I2C I/O calls require that; and disable the
317 * IRQ until we clear its status on the chip, so that this handler can
318 * work with any type of triggering (not just falling edge).
319 *
320 * The ds1337 and ds1339 both have two alarms, but we only use the first
321 * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
322 * signal; ds1339 chips have only one alarm signal.
323 */
324static void ds1307_work(struct work_struct *work)
325{
326 struct ds1307 *ds1307;
327 struct i2c_client *client;
328 struct mutex *lock;
329 int stat, control;
330
331 ds1307 = container_of(work, struct ds1307, work);
332 client = ds1307->client;
333 lock = &ds1307->rtc->ops_lock;
334
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
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700351 rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700352 }
353
354out:
355 if (test_bit(HAS_ALARM, &ds1307->flags))
356 enable_irq(client->irq);
357 mutex_unlock(lock);
358}
359
360static irqreturn_t ds1307_irq(int irq, void *dev_id)
361{
362 struct i2c_client *client = dev_id;
363 struct ds1307 *ds1307 = i2c_get_clientdata(client);
364
365 disable_irq_nosync(irq);
366 schedule_work(&ds1307->work);
367 return IRQ_HANDLED;
368}
369
370/*----------------------------------------------------------------------*/
371
David Brownell1abb0dc2006-06-25 05:48:17 -0700372static int ds1307_get_time(struct device *dev, struct rtc_time *t)
373{
374 struct ds1307 *ds1307 = dev_get_drvdata(dev);
375 int tmp;
376
David Brownell045e0e82007-07-17 04:04:55 -0700377 /* read the RTC date and time registers all at once */
Ed Swierk30e7b032009-03-31 15:24:56 -0700378 tmp = ds1307->read_block_data(ds1307->client,
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700379 ds1307->offset, 7, ds1307->regs);
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800380 if (tmp != 7) {
David Brownell1abb0dc2006-06-25 05:48:17 -0700381 dev_err(dev, "%s error %d\n", "read", tmp);
382 return -EIO;
383 }
384
Andy Shevchenko01a4ca12013-02-21 16:44:22 -0800385 dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
David Brownell1abb0dc2006-06-25 05:48:17 -0700386
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700387 t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f);
388 t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f);
David Brownell1abb0dc2006-06-25 05:48:17 -0700389 tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700390 t->tm_hour = bcd2bin(tmp);
391 t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1;
392 t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f);
David Brownell1abb0dc2006-06-25 05:48:17 -0700393 tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700394 t->tm_mon = bcd2bin(tmp) - 1;
David Brownell1abb0dc2006-06-25 05:48:17 -0700395
396 /* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700397 t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
David Brownell1abb0dc2006-06-25 05:48:17 -0700398
399 dev_dbg(dev, "%s secs=%d, mins=%d, "
400 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
401 "read", t->tm_sec, t->tm_min,
402 t->tm_hour, t->tm_mday,
403 t->tm_mon, t->tm_year, t->tm_wday);
404
David Brownell045e0e82007-07-17 04:04:55 -0700405 /* initial clock setting can be undefined */
406 return rtc_valid_tm(t);
David Brownell1abb0dc2006-06-25 05:48:17 -0700407}
408
409static int ds1307_set_time(struct device *dev, struct rtc_time *t)
410{
411 struct ds1307 *ds1307 = dev_get_drvdata(dev);
412 int result;
413 int tmp;
414 u8 *buf = ds1307->regs;
415
416 dev_dbg(dev, "%s secs=%d, mins=%d, "
417 "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
Jeff Garzik11966ad2006-10-04 04:41:53 -0400418 "write", t->tm_sec, t->tm_min,
419 t->tm_hour, t->tm_mday,
420 t->tm_mon, t->tm_year, t->tm_wday);
David Brownell1abb0dc2006-06-25 05:48:17 -0700421
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700422 buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
423 buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
424 buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
425 buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
426 buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
427 buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
David Brownell1abb0dc2006-06-25 05:48:17 -0700428
429 /* assume 20YY not 19YY */
430 tmp = t->tm_year - 100;
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700431 buf[DS1307_REG_YEAR] = bin2bcd(tmp);
David Brownell1abb0dc2006-06-25 05:48:17 -0700432
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700433 switch (ds1307->type) {
434 case ds_1337:
435 case ds_1339:
Wolfram Sang97f902b2009-06-17 16:26:10 -0700436 case ds_3231:
David Brownell1abb0dc2006-06-25 05:48:17 -0700437 buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700438 break;
439 case ds_1340:
David Brownell1abb0dc2006-06-25 05:48:17 -0700440 buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
441 | DS1340_BIT_CENTURY;
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700442 break;
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800443 case mcp794xx:
David Anders40ce9722012-03-23 15:02:37 -0700444 /*
445 * these bits were cleared when preparing the date/time
446 * values and need to be set again before writing the
447 * buffer out to the device.
448 */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800449 buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST;
450 buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN;
David Anders43fcb812011-11-02 13:37:53 -0700451 break;
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700452 default:
453 break;
454 }
David Brownell1abb0dc2006-06-25 05:48:17 -0700455
Andy Shevchenko01a4ca12013-02-21 16:44:22 -0800456 dev_dbg(dev, "%s: %7ph\n", "write", buf);
David Brownell1abb0dc2006-06-25 05:48:17 -0700457
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700458 result = ds1307->write_block_data(ds1307->client,
459 ds1307->offset, 7, buf);
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800460 if (result < 0) {
461 dev_err(dev, "%s error %d\n", "write", result);
462 return result;
David Brownell1abb0dc2006-06-25 05:48:17 -0700463 }
464 return 0;
465}
466
Jüri Reitel74d88eb2009-01-07 18:07:16 -0800467static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700468{
469 struct i2c_client *client = to_i2c_client(dev);
470 struct ds1307 *ds1307 = i2c_get_clientdata(client);
471 int ret;
472
473 if (!test_bit(HAS_ALARM, &ds1307->flags))
474 return -EINVAL;
475
476 /* read all ALARM1, ALARM2, and status registers at once */
Ed Swierk30e7b032009-03-31 15:24:56 -0700477 ret = ds1307->read_block_data(client,
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800478 DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
479 if (ret != 9) {
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700480 dev_err(dev, "%s error %d\n", "alarm read", ret);
481 return -EIO;
482 }
483
484 dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
485 "alarm read",
486 ds1307->regs[0], ds1307->regs[1],
487 ds1307->regs[2], ds1307->regs[3],
488 ds1307->regs[4], ds1307->regs[5],
489 ds1307->regs[6], ds1307->regs[7],
490 ds1307->regs[8]);
491
David Anders40ce9722012-03-23 15:02:37 -0700492 /*
493 * report alarm time (ALARM1); assume 24 hour and day-of-month modes,
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700494 * and that all four fields are checked matches
495 */
496 t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
497 t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
498 t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
499 t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
500 t->time.tm_mon = -1;
501 t->time.tm_year = -1;
502 t->time.tm_wday = -1;
503 t->time.tm_yday = -1;
504 t->time.tm_isdst = -1;
505
506 /* ... and status */
507 t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
508 t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
509
510 dev_dbg(dev, "%s secs=%d, mins=%d, "
511 "hours=%d, mday=%d, enabled=%d, pending=%d\n",
512 "alarm read", t->time.tm_sec, t->time.tm_min,
513 t->time.tm_hour, t->time.tm_mday,
514 t->enabled, t->pending);
515
516 return 0;
517}
518
Jüri Reitel74d88eb2009-01-07 18:07:16 -0800519static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700520{
David Anders40ce9722012-03-23 15:02:37 -0700521 struct i2c_client *client = to_i2c_client(dev);
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700522 struct ds1307 *ds1307 = i2c_get_clientdata(client);
523 unsigned char *buf = ds1307->regs;
524 u8 control, status;
525 int ret;
526
527 if (!test_bit(HAS_ALARM, &ds1307->flags))
528 return -EINVAL;
529
530 dev_dbg(dev, "%s secs=%d, mins=%d, "
531 "hours=%d, mday=%d, enabled=%d, pending=%d\n",
532 "alarm set", t->time.tm_sec, t->time.tm_min,
533 t->time.tm_hour, t->time.tm_mday,
534 t->enabled, t->pending);
535
536 /* read current status of both alarms and the chip */
Ed Swierk30e7b032009-03-31 15:24:56 -0700537 ret = ds1307->read_block_data(client,
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800538 DS1339_REG_ALARM1_SECS, 9, buf);
539 if (ret != 9) {
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700540 dev_err(dev, "%s error %d\n", "alarm write", ret);
541 return -EIO;
542 }
543 control = ds1307->regs[7];
544 status = ds1307->regs[8];
545
546 dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
547 "alarm set (old status)",
548 ds1307->regs[0], ds1307->regs[1],
549 ds1307->regs[2], ds1307->regs[3],
550 ds1307->regs[4], ds1307->regs[5],
551 ds1307->regs[6], control, status);
552
553 /* set ALARM1, using 24 hour and day-of-month modes */
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700554 buf[0] = bin2bcd(t->time.tm_sec);
555 buf[1] = bin2bcd(t->time.tm_min);
556 buf[2] = bin2bcd(t->time.tm_hour);
557 buf[3] = bin2bcd(t->time.tm_mday);
558
559 /* set ALARM2 to non-garbage */
560 buf[4] = 0;
561 buf[5] = 0;
562 buf[6] = 0;
563
564 /* optionally enable ALARM1 */
565 buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
566 if (t->enabled) {
567 dev_dbg(dev, "alarm IRQ armed\n");
568 buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */
569 }
570 buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
571
Ed Swierk30e7b032009-03-31 15:24:56 -0700572 ret = ds1307->write_block_data(client,
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800573 DS1339_REG_ALARM1_SECS, 9, buf);
574 if (ret < 0) {
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700575 dev_err(dev, "can't set alarm time\n");
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800576 return ret;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700577 }
578
579 return 0;
580}
581
John Stultz16380c12011-02-02 17:02:41 -0800582static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700583{
584 struct i2c_client *client = to_i2c_client(dev);
585 struct ds1307 *ds1307 = i2c_get_clientdata(client);
586 int ret;
587
John Stultz16380c12011-02-02 17:02:41 -0800588 if (!test_bit(HAS_ALARM, &ds1307->flags))
589 return -ENOTTY;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700590
John Stultz16380c12011-02-02 17:02:41 -0800591 ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
592 if (ret < 0)
593 return ret;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700594
John Stultz16380c12011-02-02 17:02:41 -0800595 if (enabled)
596 ret |= DS1337_BIT_A1IE;
597 else
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700598 ret &= ~DS1337_BIT_A1IE;
599
John Stultz16380c12011-02-02 17:02:41 -0800600 ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret);
601 if (ret < 0)
602 return ret;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700603
604 return 0;
605}
606
David Brownellff8371a2006-09-30 23:28:17 -0700607static const struct rtc_class_ops ds13xx_rtc_ops = {
David Brownell1abb0dc2006-06-25 05:48:17 -0700608 .read_time = ds1307_get_time,
609 .set_time = ds1307_set_time,
Jüri Reitel74d88eb2009-01-07 18:07:16 -0800610 .read_alarm = ds1337_read_alarm,
611 .set_alarm = ds1337_set_alarm,
John Stultz16380c12011-02-02 17:02:41 -0800612 .alarm_irq_enable = ds1307_alarm_irq_enable,
David Brownell1abb0dc2006-06-25 05:48:17 -0700613};
614
David Brownell682d73f2007-11-14 16:58:32 -0800615/*----------------------------------------------------------------------*/
616
Simon Guinot1d1945d2014-04-03 14:49:55 -0700617/*
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800618 * Alarm support for mcp794xx devices.
Simon Guinot1d1945d2014-04-03 14:49:55 -0700619 */
620
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800621#define MCP794XX_REG_CONTROL 0x07
622# define MCP794XX_BIT_ALM0_EN 0x10
623# define MCP794XX_BIT_ALM1_EN 0x20
624#define MCP794XX_REG_ALARM0_BASE 0x0a
625#define MCP794XX_REG_ALARM0_CTRL 0x0d
626#define MCP794XX_REG_ALARM1_BASE 0x11
627#define MCP794XX_REG_ALARM1_CTRL 0x14
628# define MCP794XX_BIT_ALMX_IF (1 << 3)
629# define MCP794XX_BIT_ALMX_C0 (1 << 4)
630# define MCP794XX_BIT_ALMX_C1 (1 << 5)
631# define MCP794XX_BIT_ALMX_C2 (1 << 6)
632# define MCP794XX_BIT_ALMX_POL (1 << 7)
633# define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \
634 MCP794XX_BIT_ALMX_C1 | \
635 MCP794XX_BIT_ALMX_C2)
Simon Guinot1d1945d2014-04-03 14:49:55 -0700636
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800637static void mcp794xx_work(struct work_struct *work)
Simon Guinot1d1945d2014-04-03 14:49:55 -0700638{
639 struct ds1307 *ds1307 = container_of(work, struct ds1307, work);
640 struct i2c_client *client = ds1307->client;
641 int reg, ret;
642
643 mutex_lock(&ds1307->rtc->ops_lock);
644
645 /* Check and clear alarm 0 interrupt flag. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800646 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700647 if (reg < 0)
648 goto out;
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800649 if (!(reg & MCP794XX_BIT_ALMX_IF))
Simon Guinot1d1945d2014-04-03 14:49:55 -0700650 goto out;
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800651 reg &= ~MCP794XX_BIT_ALMX_IF;
652 ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_ALARM0_CTRL, reg);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700653 if (ret < 0)
654 goto out;
655
656 /* Disable alarm 0. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800657 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700658 if (reg < 0)
659 goto out;
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800660 reg &= ~MCP794XX_BIT_ALM0_EN;
661 ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700662 if (ret < 0)
663 goto out;
664
665 rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
666
667out:
668 if (test_bit(HAS_ALARM, &ds1307->flags))
669 enable_irq(client->irq);
670 mutex_unlock(&ds1307->rtc->ops_lock);
671}
672
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800673static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
Simon Guinot1d1945d2014-04-03 14:49:55 -0700674{
675 struct i2c_client *client = to_i2c_client(dev);
676 struct ds1307 *ds1307 = i2c_get_clientdata(client);
677 u8 *regs = ds1307->regs;
678 int ret;
679
680 if (!test_bit(HAS_ALARM, &ds1307->flags))
681 return -EINVAL;
682
683 /* Read control and alarm 0 registers. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800684 ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700685 if (ret < 0)
686 return ret;
687
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800688 t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700689
690 /* Report alarm 0 time assuming 24-hour and day-of-month modes. */
691 t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f);
692 t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f);
693 t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f);
694 t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1;
695 t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f);
696 t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1;
697 t->time.tm_year = -1;
698 t->time.tm_yday = -1;
699 t->time.tm_isdst = -1;
700
701 dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
702 "enabled=%d polarity=%d irq=%d match=%d\n", __func__,
703 t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
704 t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled,
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800705 !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL),
706 !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF),
707 (ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700708
709 return 0;
710}
711
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800712static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t)
Simon Guinot1d1945d2014-04-03 14:49:55 -0700713{
714 struct i2c_client *client = to_i2c_client(dev);
715 struct ds1307 *ds1307 = i2c_get_clientdata(client);
716 unsigned char *regs = ds1307->regs;
717 int ret;
718
719 if (!test_bit(HAS_ALARM, &ds1307->flags))
720 return -EINVAL;
721
722 dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
723 "enabled=%d pending=%d\n", __func__,
724 t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
725 t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
726 t->enabled, t->pending);
727
728 /* Read control and alarm 0 registers. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800729 ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700730 if (ret < 0)
731 return ret;
732
733 /* Set alarm 0, using 24-hour and day-of-month modes. */
734 regs[3] = bin2bcd(t->time.tm_sec);
735 regs[4] = bin2bcd(t->time.tm_min);
736 regs[5] = bin2bcd(t->time.tm_hour);
737 regs[6] = bin2bcd(t->time.tm_wday) + 1;
738 regs[7] = bin2bcd(t->time.tm_mday);
739 regs[8] = bin2bcd(t->time.tm_mon) + 1;
740
741 /* Clear the alarm 0 interrupt flag. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800742 regs[6] &= ~MCP794XX_BIT_ALMX_IF;
Simon Guinot1d1945d2014-04-03 14:49:55 -0700743 /* Set alarm match: second, minute, hour, day, date, month. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800744 regs[6] |= MCP794XX_MSK_ALMX_MATCH;
Nishanth Menone3edd672015-04-20 19:51:34 -0500745 /* Disable interrupt. We will not enable until completely programmed */
746 regs[0] &= ~MCP794XX_BIT_ALM0_EN;
Simon Guinot1d1945d2014-04-03 14:49:55 -0700747
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800748 ret = ds1307->write_block_data(client, MCP794XX_REG_CONTROL, 10, regs);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700749 if (ret < 0)
750 return ret;
751
Nishanth Menone3edd672015-04-20 19:51:34 -0500752 if (!t->enabled)
753 return 0;
754 regs[0] |= MCP794XX_BIT_ALM0_EN;
755 return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, regs[0]);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700756}
757
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800758static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
Simon Guinot1d1945d2014-04-03 14:49:55 -0700759{
760 struct i2c_client *client = to_i2c_client(dev);
761 struct ds1307 *ds1307 = i2c_get_clientdata(client);
762 int reg;
763
764 if (!test_bit(HAS_ALARM, &ds1307->flags))
765 return -EINVAL;
766
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800767 reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700768 if (reg < 0)
769 return reg;
770
771 if (enabled)
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800772 reg |= MCP794XX_BIT_ALM0_EN;
Simon Guinot1d1945d2014-04-03 14:49:55 -0700773 else
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800774 reg &= ~MCP794XX_BIT_ALM0_EN;
Simon Guinot1d1945d2014-04-03 14:49:55 -0700775
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800776 return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg);
Simon Guinot1d1945d2014-04-03 14:49:55 -0700777}
778
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800779static const struct rtc_class_ops mcp794xx_rtc_ops = {
Simon Guinot1d1945d2014-04-03 14:49:55 -0700780 .read_time = ds1307_get_time,
781 .set_time = ds1307_set_time,
Tomas Novotnyf4199f82014-12-10 15:53:57 -0800782 .read_alarm = mcp794xx_read_alarm,
783 .set_alarm = mcp794xx_set_alarm,
784 .alarm_irq_enable = mcp794xx_alarm_irq_enable,
Simon Guinot1d1945d2014-04-03 14:49:55 -0700785};
786
787/*----------------------------------------------------------------------*/
788
David Brownell682d73f2007-11-14 16:58:32 -0800789static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700790ds1307_nvram_read(struct file *filp, struct kobject *kobj,
791 struct bin_attribute *attr,
David Brownell682d73f2007-11-14 16:58:32 -0800792 char *buf, loff_t off, size_t count)
793{
794 struct i2c_client *client;
795 struct ds1307 *ds1307;
David Brownell682d73f2007-11-14 16:58:32 -0800796 int result;
797
frederic Rodofcd8db02008-02-06 01:38:55 -0800798 client = kobj_to_i2c_client(kobj);
David Brownell682d73f2007-11-14 16:58:32 -0800799 ds1307 = i2c_get_clientdata(client);
800
Austin Boyle9eab0a72012-03-23 15:02:38 -0700801 if (unlikely(off >= ds1307->nvram->size))
David Brownell682d73f2007-11-14 16:58:32 -0800802 return 0;
Austin Boyle9eab0a72012-03-23 15:02:38 -0700803 if ((off + count) > ds1307->nvram->size)
804 count = ds1307->nvram->size - off;
David Brownell682d73f2007-11-14 16:58:32 -0800805 if (unlikely(!count))
806 return count;
807
Austin Boyle9eab0a72012-03-23 15:02:38 -0700808 result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
809 count, buf);
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800810 if (result < 0)
David Brownell682d73f2007-11-14 16:58:32 -0800811 dev_err(&client->dev, "%s error %d\n", "nvram read", result);
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800812 return result;
David Brownell682d73f2007-11-14 16:58:32 -0800813}
814
815static ssize_t
Chris Wright2c3c8be2010-05-12 18:28:57 -0700816ds1307_nvram_write(struct file *filp, struct kobject *kobj,
817 struct bin_attribute *attr,
David Brownell682d73f2007-11-14 16:58:32 -0800818 char *buf, loff_t off, size_t count)
819{
820 struct i2c_client *client;
Ed Swierk30e7b032009-03-31 15:24:56 -0700821 struct ds1307 *ds1307;
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800822 int result;
David Brownell682d73f2007-11-14 16:58:32 -0800823
frederic Rodofcd8db02008-02-06 01:38:55 -0800824 client = kobj_to_i2c_client(kobj);
Ed Swierk30e7b032009-03-31 15:24:56 -0700825 ds1307 = i2c_get_clientdata(client);
David Brownell682d73f2007-11-14 16:58:32 -0800826
Austin Boyle9eab0a72012-03-23 15:02:38 -0700827 if (unlikely(off >= ds1307->nvram->size))
David Brownell682d73f2007-11-14 16:58:32 -0800828 return -EFBIG;
Austin Boyle9eab0a72012-03-23 15:02:38 -0700829 if ((off + count) > ds1307->nvram->size)
830 count = ds1307->nvram->size - off;
David Brownell682d73f2007-11-14 16:58:32 -0800831 if (unlikely(!count))
832 return count;
833
Austin Boyle9eab0a72012-03-23 15:02:38 -0700834 result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
835 count, buf);
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800836 if (result < 0) {
837 dev_err(&client->dev, "%s error %d\n", "nvram write", result);
838 return result;
839 }
840 return count;
David Brownell682d73f2007-11-14 16:58:32 -0800841}
842
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700843
David Brownell682d73f2007-11-14 16:58:32 -0800844/*----------------------------------------------------------------------*/
845
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700846static u8 do_trickle_setup_ds1339(struct i2c_client *client,
847 uint32_t ohms, bool diode)
848{
849 u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE :
850 DS1307_TRICKLE_CHARGER_NO_DIODE;
851
852 switch (ohms) {
853 case 250:
854 setup |= DS1307_TRICKLE_CHARGER_250_OHM;
855 break;
856 case 2000:
857 setup |= DS1307_TRICKLE_CHARGER_2K_OHM;
858 break;
859 case 4000:
860 setup |= DS1307_TRICKLE_CHARGER_4K_OHM;
861 break;
862 default:
863 dev_warn(&client->dev,
864 "Unsupported ohm value %u in dt\n", ohms);
865 return 0;
866 }
867 return setup;
868}
869
870static void ds1307_trickle_of_init(struct i2c_client *client,
871 struct chip_desc *chip)
872{
873 uint32_t ohms = 0;
874 bool diode = true;
875
876 if (!chip->do_trickle_setup)
877 goto out;
878 if (of_property_read_u32(client->dev.of_node, "trickle-resistor-ohms" , &ohms))
879 goto out;
880 if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))
881 diode = false;
882 chip->trickle_charger_setup = chip->do_trickle_setup(client,
883 ohms, diode);
884out:
885 return;
886}
887
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800888static int ds1307_probe(struct i2c_client *client,
889 const struct i2c_device_id *id)
David Brownell1abb0dc2006-06-25 05:48:17 -0700890{
891 struct ds1307 *ds1307;
892 int err = -ENODEV;
David Brownell1abb0dc2006-06-25 05:48:17 -0700893 int tmp;
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700894 struct chip_desc *chip = &chips[id->driver_data];
David Brownellc065f352007-07-17 04:05:10 -0700895 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
Peter Senna Tschudinc8b18da2013-11-12 15:10:59 -0800896 bool want_irq = false;
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800897 unsigned char *buf;
Jingoo Han01ce8932013-11-12 15:10:41 -0800898 struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
Wolfram Sang97f902b2009-06-17 16:26:10 -0700899 static const int bbsqi_bitpos[] = {
900 [ds_1337] = 0,
901 [ds_1339] = DS1339_BIT_BBSQI,
902 [ds_3231] = DS3231_BIT_BBSQW,
903 };
Simon Guinot1d1945d2014-04-03 14:49:55 -0700904 const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops;
David Brownell1abb0dc2006-06-25 05:48:17 -0700905
Ed Swierk30e7b032009-03-31 15:24:56 -0700906 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
907 && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
David Brownellc065f352007-07-17 04:05:10 -0700908 return -EIO;
David Brownell1abb0dc2006-06-25 05:48:17 -0700909
Jingoo Hanedca66d2013-07-03 15:07:05 -0700910 ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL);
David Anders40ce9722012-03-23 15:02:37 -0700911 if (!ds1307)
David Brownellc065f352007-07-17 04:05:10 -0700912 return -ENOMEM;
David Brownell045e0e82007-07-17 04:04:55 -0700913
David Brownell1abb0dc2006-06-25 05:48:17 -0700914 i2c_set_clientdata(client, ds1307);
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700915
916 ds1307->client = client;
917 ds1307->type = id->driver_data;
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -0700918
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700919 if (!pdata && client->dev.of_node)
920 ds1307_trickle_of_init(client, chip);
921 else if (pdata && pdata->trickle_charger_setup)
922 chip->trickle_charger_setup = pdata->trickle_charger_setup;
923
924 if (chip->trickle_charger_setup && chip->trickle_charger_reg) {
925 dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n",
926 DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup,
927 chip->trickle_charger_reg);
Wolfram Sangeb86c302012-05-29 15:07:38 -0700928 i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
Matti Vaittinen33b04b72014-10-13 15:52:48 -0700929 DS13XX_TRICKLE_CHARGER_MAGIC |
930 chip->trickle_charger_setup);
931 }
Wolfram Sangeb86c302012-05-29 15:07:38 -0700932
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800933 buf = ds1307->regs;
Ed Swierk30e7b032009-03-31 15:24:56 -0700934 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
Bertrand Achardbc48b902013-04-29 16:19:26 -0700935 ds1307->read_block_data = ds1307_native_smbus_read_block_data;
936 ds1307->write_block_data = ds1307_native_smbus_write_block_data;
Ed Swierk30e7b032009-03-31 15:24:56 -0700937 } else {
938 ds1307->read_block_data = ds1307_read_block_data;
939 ds1307->write_block_data = ds1307_write_block_data;
940 }
David Brownell045e0e82007-07-17 04:04:55 -0700941
942 switch (ds1307->type) {
943 case ds_1337:
944 case ds_1339:
Wolfram Sang97f902b2009-06-17 16:26:10 -0700945 case ds_3231:
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700946 /* get registers that the "rtc" read below won't read... */
Ed Swierk30e7b032009-03-31 15:24:56 -0700947 tmp = ds1307->read_block_data(ds1307->client,
BARRE Sebastienfed40b72009-01-07 18:07:13 -0800948 DS1337_REG_CONTROL, 2, buf);
David Brownell1abb0dc2006-06-25 05:48:17 -0700949 if (tmp != 2) {
Jingoo Han6df80e22013-04-29 16:19:28 -0700950 dev_dbg(&client->dev, "read error %d\n", tmp);
David Brownell1abb0dc2006-06-25 05:48:17 -0700951 err = -EIO;
Jingoo Hanedca66d2013-07-03 15:07:05 -0700952 goto exit;
David Brownell1abb0dc2006-06-25 05:48:17 -0700953 }
954
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700955 /* oscillator off? turn it on, so clock can tick. */
956 if (ds1307->regs[0] & DS1337_BIT_nEOSC)
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700957 ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
958
David Anders40ce9722012-03-23 15:02:37 -0700959 /*
960 * Using IRQ? Disable the square wave and both alarms.
Wolfram Sang97f902b2009-06-17 16:26:10 -0700961 * For some variants, be sure alarms can trigger when we're
962 * running on Vbackup (BBSQI/BBSQW)
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700963 */
Wolfram Sangb24a7262012-03-23 15:02:37 -0700964 if (ds1307->client->irq > 0 && chip->alarm) {
965 INIT_WORK(&ds1307->work, ds1307_work);
966
Wolfram Sang97f902b2009-06-17 16:26:10 -0700967 ds1307->regs[0] |= DS1337_BIT_INTCN
968 | bbsqi_bitpos[ds1307->type];
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700969 ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
Wolfram Sangb24a7262012-03-23 15:02:37 -0700970
971 want_irq = true;
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -0700972 }
973
974 i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
975 ds1307->regs[0]);
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -0700976
977 /* oscillator fault? clear flag, and warn */
978 if (ds1307->regs[1] & DS1337_BIT_OSF) {
979 i2c_smbus_write_byte_data(client, DS1337_REG_STATUS,
980 ds1307->regs[1] & ~DS1337_BIT_OSF);
981 dev_warn(&client->dev, "SET TIME!\n");
David Brownell1abb0dc2006-06-25 05:48:17 -0700982 }
David Brownell045e0e82007-07-17 04:04:55 -0700983 break;
Matthias Fuchsa2166852009-03-31 15:24:58 -0700984
985 case rx_8025:
986 tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
987 RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
988 if (tmp != 2) {
Jingoo Han6df80e22013-04-29 16:19:28 -0700989 dev_dbg(&client->dev, "read error %d\n", tmp);
Matthias Fuchsa2166852009-03-31 15:24:58 -0700990 err = -EIO;
Jingoo Hanedca66d2013-07-03 15:07:05 -0700991 goto exit;
Matthias Fuchsa2166852009-03-31 15:24:58 -0700992 }
993
994 /* oscillator off? turn it on, so clock can tick. */
995 if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
996 ds1307->regs[1] |= RX8025_BIT_XST;
997 i2c_smbus_write_byte_data(client,
998 RX8025_REG_CTRL2 << 4 | 0x08,
999 ds1307->regs[1]);
1000 dev_warn(&client->dev,
1001 "oscillator stop detected - SET TIME!\n");
1002 }
1003
1004 if (ds1307->regs[1] & RX8025_BIT_PON) {
1005 ds1307->regs[1] &= ~RX8025_BIT_PON;
1006 i2c_smbus_write_byte_data(client,
1007 RX8025_REG_CTRL2 << 4 | 0x08,
1008 ds1307->regs[1]);
1009 dev_warn(&client->dev, "power-on detected\n");
1010 }
1011
1012 if (ds1307->regs[1] & RX8025_BIT_VDET) {
1013 ds1307->regs[1] &= ~RX8025_BIT_VDET;
1014 i2c_smbus_write_byte_data(client,
1015 RX8025_REG_CTRL2 << 4 | 0x08,
1016 ds1307->regs[1]);
1017 dev_warn(&client->dev, "voltage drop detected\n");
1018 }
1019
1020 /* make sure we are running in 24hour mode */
1021 if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
1022 u8 hour;
1023
1024 /* switch to 24 hour mode */
1025 i2c_smbus_write_byte_data(client,
1026 RX8025_REG_CTRL1 << 4 | 0x08,
1027 ds1307->regs[0] |
1028 RX8025_BIT_2412);
1029
1030 tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
1031 RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
1032 if (tmp != 2) {
Jingoo Han6df80e22013-04-29 16:19:28 -07001033 dev_dbg(&client->dev, "read error %d\n", tmp);
Matthias Fuchsa2166852009-03-31 15:24:58 -07001034 err = -EIO;
Jingoo Hanedca66d2013-07-03 15:07:05 -07001035 goto exit;
Matthias Fuchsa2166852009-03-31 15:24:58 -07001036 }
1037
1038 /* correct hour */
1039 hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
1040 if (hour == 12)
1041 hour = 0;
1042 if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
1043 hour += 12;
1044
1045 i2c_smbus_write_byte_data(client,
1046 DS1307_REG_HOUR << 4 | 0x08,
1047 hour);
1048 }
1049 break;
Joakim Tjernlund33df2ee2009-06-17 16:26:08 -07001050 case ds_1388:
1051 ds1307->offset = 1; /* Seconds starts at 1 */
1052 break;
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001053 case mcp794xx:
1054 rtc_ops = &mcp794xx_rtc_ops;
Simon Guinot1d1945d2014-04-03 14:49:55 -07001055 if (ds1307->client->irq > 0 && chip->alarm) {
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001056 INIT_WORK(&ds1307->work, mcp794xx_work);
Simon Guinot1d1945d2014-04-03 14:49:55 -07001057 want_irq = true;
1058 }
1059 break;
David Brownell045e0e82007-07-17 04:04:55 -07001060 default:
1061 break;
1062 }
David Brownell1abb0dc2006-06-25 05:48:17 -07001063
1064read_rtc:
1065 /* read RTC registers */
Joakim Tjernlund96fc3a42010-06-29 15:05:34 -07001066 tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
BARRE Sebastienfed40b72009-01-07 18:07:13 -08001067 if (tmp != 8) {
Jingoo Han6df80e22013-04-29 16:19:28 -07001068 dev_dbg(&client->dev, "read error %d\n", tmp);
David Brownell1abb0dc2006-06-25 05:48:17 -07001069 err = -EIO;
Jingoo Hanedca66d2013-07-03 15:07:05 -07001070 goto exit;
David Brownell1abb0dc2006-06-25 05:48:17 -07001071 }
1072
David Anders40ce9722012-03-23 15:02:37 -07001073 /*
1074 * minimal sanity checking; some chips (like DS1340) don't
David Brownell1abb0dc2006-06-25 05:48:17 -07001075 * specify the extra bits as must-be-zero, but there are
1076 * still a few values that are clearly out-of-range.
1077 */
1078 tmp = ds1307->regs[DS1307_REG_SECS];
David Brownell045e0e82007-07-17 04:04:55 -07001079 switch (ds1307->type) {
1080 case ds_1307:
David Brownell045e0e82007-07-17 04:04:55 -07001081 case m41t00:
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -07001082 /* clock halted? turn it on, so clock can tick. */
David Brownell045e0e82007-07-17 04:04:55 -07001083 if (tmp & DS1307_BIT_CH) {
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -07001084 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1085 dev_warn(&client->dev, "SET TIME!\n");
David Brownell045e0e82007-07-17 04:04:55 -07001086 goto read_rtc;
David Brownell1abb0dc2006-06-25 05:48:17 -07001087 }
David Brownell045e0e82007-07-17 04:04:55 -07001088 break;
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -07001089 case ds_1338:
1090 /* clock halted? turn it on, so clock can tick. */
David Brownell045e0e82007-07-17 04:04:55 -07001091 if (tmp & DS1307_BIT_CH)
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -07001092 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1093
1094 /* oscillator fault? clear flag, and warn */
1095 if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
1096 i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL,
David Brownellbd16f9e2007-07-26 10:41:00 -07001097 ds1307->regs[DS1307_REG_CONTROL]
Rodolfo Giomettibe5f59f2007-07-17 04:05:06 -07001098 & ~DS1338_BIT_OSF);
1099 dev_warn(&client->dev, "SET TIME!\n");
1100 goto read_rtc;
1101 }
David Brownell045e0e82007-07-17 04:04:55 -07001102 break;
frederic Rodofcd8db02008-02-06 01:38:55 -08001103 case ds_1340:
1104 /* clock halted? turn it on, so clock can tick. */
1105 if (tmp & DS1340_BIT_nEOSC)
1106 i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
1107
1108 tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
1109 if (tmp < 0) {
Jingoo Han6df80e22013-04-29 16:19:28 -07001110 dev_dbg(&client->dev, "read error %d\n", tmp);
frederic Rodofcd8db02008-02-06 01:38:55 -08001111 err = -EIO;
Jingoo Hanedca66d2013-07-03 15:07:05 -07001112 goto exit;
frederic Rodofcd8db02008-02-06 01:38:55 -08001113 }
1114
1115 /* oscillator fault? clear flag, and warn */
1116 if (tmp & DS1340_BIT_OSF) {
1117 i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
1118 dev_warn(&client->dev, "SET TIME!\n");
1119 }
1120 break;
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001121 case mcp794xx:
David Anders43fcb812011-11-02 13:37:53 -07001122 /* make sure that the backup battery is enabled */
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001123 if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) {
David Anders43fcb812011-11-02 13:37:53 -07001124 i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
1125 ds1307->regs[DS1307_REG_WDAY]
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001126 | MCP794XX_BIT_VBATEN);
David Anders43fcb812011-11-02 13:37:53 -07001127 }
1128
1129 /* clock halted? turn it on, so clock can tick. */
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001130 if (!(tmp & MCP794XX_BIT_ST)) {
David Anders43fcb812011-11-02 13:37:53 -07001131 i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
Tomas Novotnyf4199f82014-12-10 15:53:57 -08001132 MCP794XX_BIT_ST);
David Anders43fcb812011-11-02 13:37:53 -07001133 dev_warn(&client->dev, "SET TIME!\n");
1134 goto read_rtc;
1135 }
1136
1137 break;
Wolfram Sang32d322b2012-03-23 15:02:36 -07001138 default:
David Brownell045e0e82007-07-17 04:04:55 -07001139 break;
David Brownell1abb0dc2006-06-25 05:48:17 -07001140 }
David Brownell045e0e82007-07-17 04:04:55 -07001141
David Brownell1abb0dc2006-06-25 05:48:17 -07001142 tmp = ds1307->regs[DS1307_REG_HOUR];
David Brownellc065f352007-07-17 04:05:10 -07001143 switch (ds1307->type) {
1144 case ds_1340:
1145 case m41t00:
David Anders40ce9722012-03-23 15:02:37 -07001146 /*
1147 * NOTE: ignores century bits; fix before deploying
David Brownellc065f352007-07-17 04:05:10 -07001148 * systems that will run through year 2100.
1149 */
1150 break;
Matthias Fuchsa2166852009-03-31 15:24:58 -07001151 case rx_8025:
1152 break;
David Brownellc065f352007-07-17 04:05:10 -07001153 default:
1154 if (!(tmp & DS1307_BIT_12HR))
1155 break;
1156
David Anders40ce9722012-03-23 15:02:37 -07001157 /*
1158 * Be sure we're in 24 hour mode. Multi-master systems
David Brownellc065f352007-07-17 04:05:10 -07001159 * take note...
1160 */
Adrian Bunkfe20ba72008-10-18 20:28:41 -07001161 tmp = bcd2bin(tmp & 0x1f);
David Brownellc065f352007-07-17 04:05:10 -07001162 if (tmp == 12)
1163 tmp = 0;
1164 if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
1165 tmp += 12;
David Brownell1abb0dc2006-06-25 05:48:17 -07001166 i2c_smbus_write_byte_data(client,
Joakim Tjernlund96fc3a42010-06-29 15:05:34 -07001167 ds1307->offset + DS1307_REG_HOUR,
Adrian Bunkfe20ba72008-10-18 20:28:41 -07001168 bin2bcd(tmp));
David Brownell1abb0dc2006-06-25 05:48:17 -07001169 }
1170
Simon Guinot5ea73512014-04-03 14:49:54 -07001171 device_set_wakeup_capable(&client->dev, want_irq);
Jingoo Hanedca66d2013-07-03 15:07:05 -07001172 ds1307->rtc = devm_rtc_device_register(&client->dev, client->name,
Simon Guinot1d1945d2014-04-03 14:49:55 -07001173 rtc_ops, THIS_MODULE);
David Brownell1abb0dc2006-06-25 05:48:17 -07001174 if (IS_ERR(ds1307->rtc)) {
Alessandro Zummo4071ea22014-04-03 14:49:36 -07001175 return PTR_ERR(ds1307->rtc);
David Brownell1abb0dc2006-06-25 05:48:17 -07001176 }
1177
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -07001178 if (want_irq) {
Dmitry Eremin-Solenikov43d15bc2009-12-15 16:46:14 -08001179 err = request_irq(client->irq, ds1307_irq, IRQF_SHARED,
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -07001180 ds1307->rtc->name, client);
1181 if (err) {
Alessandro Zummo4071ea22014-04-03 14:49:36 -07001182 client->irq = 0;
1183 dev_err(&client->dev, "unable to request IRQ!\n");
1184 } else {
Anton Vorontsov26b3c012009-12-17 15:27:23 -08001185
Alessandro Zummo4071ea22014-04-03 14:49:36 -07001186 set_bit(HAS_ALARM, &ds1307->flags);
1187 dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
1188 }
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -07001189 }
1190
Austin Boyle9eab0a72012-03-23 15:02:38 -07001191 if (chip->nvram_size) {
Alessandro Zummo4071ea22014-04-03 14:49:36 -07001192
Jingoo Hanedca66d2013-07-03 15:07:05 -07001193 ds1307->nvram = devm_kzalloc(&client->dev,
1194 sizeof(struct bin_attribute),
1195 GFP_KERNEL);
Austin Boyle9eab0a72012-03-23 15:02:38 -07001196 if (!ds1307->nvram) {
Alessandro Zummo4071ea22014-04-03 14:49:36 -07001197 dev_err(&client->dev, "cannot allocate memory for nvram sysfs\n");
1198 } else {
1199
1200 ds1307->nvram->attr.name = "nvram";
1201 ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR;
1202
1203 sysfs_bin_attr_init(ds1307->nvram);
1204
1205 ds1307->nvram->read = ds1307_nvram_read;
1206 ds1307->nvram->write = ds1307_nvram_write;
1207 ds1307->nvram->size = chip->nvram_size;
1208 ds1307->nvram_offset = chip->nvram_offset;
1209
1210 err = sysfs_create_bin_file(&client->dev.kobj,
1211 ds1307->nvram);
1212 if (err) {
1213 dev_err(&client->dev,
1214 "unable to create sysfs file: %s\n",
1215 ds1307->nvram->attr.name);
1216 } else {
1217 set_bit(HAS_NVRAM, &ds1307->flags);
1218 dev_info(&client->dev, "%zu bytes nvram\n",
1219 ds1307->nvram->size);
1220 }
David Brownell682d73f2007-11-14 16:58:32 -08001221 }
1222 }
1223
David Brownell1abb0dc2006-06-25 05:48:17 -07001224 return 0;
1225
Jingoo Hanedca66d2013-07-03 15:07:05 -07001226exit:
David Brownell1abb0dc2006-06-25 05:48:17 -07001227 return err;
1228}
1229
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -08001230static int ds1307_remove(struct i2c_client *client)
David Brownell1abb0dc2006-06-25 05:48:17 -07001231{
David Anders40ce9722012-03-23 15:02:37 -07001232 struct ds1307 *ds1307 = i2c_get_clientdata(client);
David Brownell1abb0dc2006-06-25 05:48:17 -07001233
Rodolfo Giometticb49a5e2008-10-15 22:02:58 -07001234 if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) {
1235 free_irq(client->irq, client);
1236 cancel_work_sync(&ds1307->work);
1237 }
1238
Jingoo Hanedca66d2013-07-03 15:07:05 -07001239 if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags))
Austin Boyle9eab0a72012-03-23 15:02:38 -07001240 sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);
David Brownell682d73f2007-11-14 16:58:32 -08001241
David Brownell1abb0dc2006-06-25 05:48:17 -07001242 return 0;
1243}
1244
1245static struct i2c_driver ds1307_driver = {
1246 .driver = {
David Brownellc065f352007-07-17 04:05:10 -07001247 .name = "rtc-ds1307",
David Brownell1abb0dc2006-06-25 05:48:17 -07001248 .owner = THIS_MODULE,
1249 },
David Brownellc065f352007-07-17 04:05:10 -07001250 .probe = ds1307_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -08001251 .remove = ds1307_remove,
Jean Delvare3760f732008-04-29 23:11:40 +02001252 .id_table = ds1307_id,
David Brownell1abb0dc2006-06-25 05:48:17 -07001253};
1254
Axel Lin0abc9202012-03-23 15:02:31 -07001255module_i2c_driver(ds1307_driver);
David Brownell1abb0dc2006-06-25 05:48:17 -07001256
1257MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips");
1258MODULE_LICENSE("GPL");