forked from luck/tmp_suning_uos_patched
6df80e211b
dev_dbg() is preferred to pr_debug(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1019 lines
27 KiB
C
1019 lines
27 KiB
C
/*
|
|
* rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips.
|
|
*
|
|
* Copyright (C) 2005 James Chapman (ds1337 core)
|
|
* Copyright (C) 2006 David Brownell
|
|
* Copyright (C) 2009 Matthias Fuchs (rx8025 support)
|
|
* Copyright (C) 2012 Bertrand Achard (nvram access fixes)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/string.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/bcd.h>
|
|
#include <linux/rtc/ds1307.h>
|
|
|
|
/*
|
|
* We can't determine type by probing, but if we expect pre-Linux code
|
|
* to have set the chip up as a clock (turning on the oscillator and
|
|
* setting the date and time), Linux can ignore the non-clock features.
|
|
* That's a natural job for a factory or repair bench.
|
|
*/
|
|
enum ds_type {
|
|
ds_1307,
|
|
ds_1337,
|
|
ds_1338,
|
|
ds_1339,
|
|
ds_1340,
|
|
ds_1388,
|
|
ds_3231,
|
|
m41t00,
|
|
mcp7941x,
|
|
rx_8025,
|
|
last_ds_type /* always last */
|
|
/* rs5c372 too? different address... */
|
|
};
|
|
|
|
|
|
/* RTC registers don't differ much, except for the century flag */
|
|
#define DS1307_REG_SECS 0x00 /* 00-59 */
|
|
# define DS1307_BIT_CH 0x80
|
|
# define DS1340_BIT_nEOSC 0x80
|
|
# define MCP7941X_BIT_ST 0x80
|
|
#define DS1307_REG_MIN 0x01 /* 00-59 */
|
|
#define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */
|
|
# define DS1307_BIT_12HR 0x40 /* in REG_HOUR */
|
|
# define DS1307_BIT_PM 0x20 /* in REG_HOUR */
|
|
# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
|
|
# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
|
|
#define DS1307_REG_WDAY 0x03 /* 01-07 */
|
|
# define MCP7941X_BIT_VBATEN 0x08
|
|
#define DS1307_REG_MDAY 0x04 /* 01-31 */
|
|
#define DS1307_REG_MONTH 0x05 /* 01-12 */
|
|
# define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */
|
|
#define DS1307_REG_YEAR 0x06 /* 00-99 */
|
|
|
|
/*
|
|
* Other registers (control, status, alarms, trickle charge, NVRAM, etc)
|
|
* start at 7, and they differ a LOT. Only control and status matter for
|
|
* basic RTC date and time functionality; be careful using them.
|
|
*/
|
|
#define DS1307_REG_CONTROL 0x07 /* or ds1338 */
|
|
# define DS1307_BIT_OUT 0x80
|
|
# define DS1338_BIT_OSF 0x20
|
|
# define DS1307_BIT_SQWE 0x10
|
|
# define DS1307_BIT_RS1 0x02
|
|
# define DS1307_BIT_RS0 0x01
|
|
#define DS1337_REG_CONTROL 0x0e
|
|
# define DS1337_BIT_nEOSC 0x80
|
|
# define DS1339_BIT_BBSQI 0x20
|
|
# define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */
|
|
# define DS1337_BIT_RS2 0x10
|
|
# define DS1337_BIT_RS1 0x08
|
|
# define DS1337_BIT_INTCN 0x04
|
|
# define DS1337_BIT_A2IE 0x02
|
|
# define DS1337_BIT_A1IE 0x01
|
|
#define DS1340_REG_CONTROL 0x07
|
|
# define DS1340_BIT_OUT 0x80
|
|
# define DS1340_BIT_FT 0x40
|
|
# define DS1340_BIT_CALIB_SIGN 0x20
|
|
# define DS1340_M_CALIBRATION 0x1f
|
|
#define DS1340_REG_FLAG 0x09
|
|
# define DS1340_BIT_OSF 0x80
|
|
#define DS1337_REG_STATUS 0x0f
|
|
# define DS1337_BIT_OSF 0x80
|
|
# define DS1337_BIT_A2I 0x02
|
|
# define DS1337_BIT_A1I 0x01
|
|
#define DS1339_REG_ALARM1_SECS 0x07
|
|
|
|
#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
|
|
|
|
#define RX8025_REG_CTRL1 0x0e
|
|
# define RX8025_BIT_2412 0x20
|
|
#define RX8025_REG_CTRL2 0x0f
|
|
# define RX8025_BIT_PON 0x10
|
|
# define RX8025_BIT_VDET 0x40
|
|
# define RX8025_BIT_XST 0x20
|
|
|
|
|
|
struct ds1307 {
|
|
u8 offset; /* register's offset */
|
|
u8 regs[11];
|
|
u16 nvram_offset;
|
|
struct bin_attribute *nvram;
|
|
enum ds_type type;
|
|
unsigned long flags;
|
|
#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
|
|
#define HAS_ALARM 1 /* bit 1 == irq claimed */
|
|
struct i2c_client *client;
|
|
struct rtc_device *rtc;
|
|
struct work_struct work;
|
|
s32 (*read_block_data)(const struct i2c_client *client, u8 command,
|
|
u8 length, u8 *values);
|
|
s32 (*write_block_data)(const struct i2c_client *client, u8 command,
|
|
u8 length, const u8 *values);
|
|
};
|
|
|
|
struct chip_desc {
|
|
unsigned alarm:1;
|
|
u16 nvram_offset;
|
|
u16 nvram_size;
|
|
u16 trickle_charger_reg;
|
|
};
|
|
|
|
static const struct chip_desc chips[last_ds_type] = {
|
|
[ds_1307] = {
|
|
.nvram_offset = 8,
|
|
.nvram_size = 56,
|
|
},
|
|
[ds_1337] = {
|
|
.alarm = 1,
|
|
},
|
|
[ds_1338] = {
|
|
.nvram_offset = 8,
|
|
.nvram_size = 56,
|
|
},
|
|
[ds_1339] = {
|
|
.alarm = 1,
|
|
.trickle_charger_reg = 0x10,
|
|
},
|
|
[ds_1340] = {
|
|
.trickle_charger_reg = 0x08,
|
|
},
|
|
[ds_1388] = {
|
|
.trickle_charger_reg = 0x0a,
|
|
},
|
|
[ds_3231] = {
|
|
.alarm = 1,
|
|
},
|
|
[mcp7941x] = {
|
|
/* this is battery backed SRAM */
|
|
.nvram_offset = 0x20,
|
|
.nvram_size = 0x40,
|
|
},
|
|
};
|
|
|
|
static const struct i2c_device_id ds1307_id[] = {
|
|
{ "ds1307", ds_1307 },
|
|
{ "ds1337", ds_1337 },
|
|
{ "ds1338", ds_1338 },
|
|
{ "ds1339", ds_1339 },
|
|
{ "ds1388", ds_1388 },
|
|
{ "ds1340", ds_1340 },
|
|
{ "ds3231", ds_3231 },
|
|
{ "m41t00", m41t00 },
|
|
{ "mcp7941x", mcp7941x },
|
|
{ "pt7c4338", ds_1307 },
|
|
{ "rx8025", rx_8025 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ds1307_id);
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
#define BLOCK_DATA_MAX_TRIES 10
|
|
|
|
static s32 ds1307_read_block_data_once(const struct i2c_client *client,
|
|
u8 command, u8 length, u8 *values)
|
|
{
|
|
s32 i, data;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
data = i2c_smbus_read_byte_data(client, command + i);
|
|
if (data < 0)
|
|
return data;
|
|
values[i] = data;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command,
|
|
u8 length, u8 *values)
|
|
{
|
|
u8 oldvalues[255];
|
|
s32 ret;
|
|
int tries = 0;
|
|
|
|
dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length);
|
|
ret = ds1307_read_block_data_once(client, command, length, values);
|
|
if (ret < 0)
|
|
return ret;
|
|
do {
|
|
if (++tries > BLOCK_DATA_MAX_TRIES) {
|
|
dev_err(&client->dev,
|
|
"ds1307_read_block_data failed\n");
|
|
return -EIO;
|
|
}
|
|
memcpy(oldvalues, values, length);
|
|
ret = ds1307_read_block_data_once(client, command, length,
|
|
values);
|
|
if (ret < 0)
|
|
return ret;
|
|
} while (memcmp(oldvalues, values, length));
|
|
return length;
|
|
}
|
|
|
|
static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command,
|
|
u8 length, const u8 *values)
|
|
{
|
|
u8 currvalues[255];
|
|
int tries = 0;
|
|
|
|
dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length);
|
|
do {
|
|
s32 i, ret;
|
|
|
|
if (++tries > BLOCK_DATA_MAX_TRIES) {
|
|
dev_err(&client->dev,
|
|
"ds1307_write_block_data failed\n");
|
|
return -EIO;
|
|
}
|
|
for (i = 0; i < length; i++) {
|
|
ret = i2c_smbus_write_byte_data(client, command + i,
|
|
values[i]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
ret = ds1307_read_block_data_once(client, command, length,
|
|
currvalues);
|
|
if (ret < 0)
|
|
return ret;
|
|
} while (memcmp(currvalues, values, length));
|
|
return length;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
/* These RTC devices are not designed to be connected to a SMbus adapter.
|
|
SMbus limits block operations length to 32 bytes, whereas it's not
|
|
limited on I2C buses. As a result, accesses may exceed 32 bytes;
|
|
in that case, split them into smaller blocks */
|
|
|
|
static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client,
|
|
u8 command, u8 length, const u8 *values)
|
|
{
|
|
u8 suboffset = 0;
|
|
|
|
if (length <= I2C_SMBUS_BLOCK_MAX)
|
|
return i2c_smbus_write_i2c_block_data(client,
|
|
command, length, values);
|
|
|
|
while (suboffset < length) {
|
|
s32 retval = i2c_smbus_write_i2c_block_data(client,
|
|
command + suboffset,
|
|
min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
|
|
values + suboffset);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
suboffset += I2C_SMBUS_BLOCK_MAX;
|
|
}
|
|
return length;
|
|
}
|
|
|
|
static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
|
|
u8 command, u8 length, u8 *values)
|
|
{
|
|
u8 suboffset = 0;
|
|
|
|
if (length <= I2C_SMBUS_BLOCK_MAX)
|
|
return i2c_smbus_read_i2c_block_data(client,
|
|
command, length, values);
|
|
|
|
while (suboffset < length) {
|
|
s32 retval = i2c_smbus_read_i2c_block_data(client,
|
|
command + suboffset,
|
|
min(I2C_SMBUS_BLOCK_MAX, length - suboffset),
|
|
values + suboffset);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
suboffset += I2C_SMBUS_BLOCK_MAX;
|
|
}
|
|
return length;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* The IRQ logic includes a "real" handler running in IRQ context just
|
|
* long enough to schedule this workqueue entry. We need a task context
|
|
* to talk to the RTC, since I2C I/O calls require that; and disable the
|
|
* IRQ until we clear its status on the chip, so that this handler can
|
|
* work with any type of triggering (not just falling edge).
|
|
*
|
|
* The ds1337 and ds1339 both have two alarms, but we only use the first
|
|
* one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
|
|
* signal; ds1339 chips have only one alarm signal.
|
|
*/
|
|
static void ds1307_work(struct work_struct *work)
|
|
{
|
|
struct ds1307 *ds1307;
|
|
struct i2c_client *client;
|
|
struct mutex *lock;
|
|
int stat, control;
|
|
|
|
ds1307 = container_of(work, struct ds1307, work);
|
|
client = ds1307->client;
|
|
lock = &ds1307->rtc->ops_lock;
|
|
|
|
mutex_lock(lock);
|
|
stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
|
|
if (stat < 0)
|
|
goto out;
|
|
|
|
if (stat & DS1337_BIT_A1I) {
|
|
stat &= ~DS1337_BIT_A1I;
|
|
i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat);
|
|
|
|
control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
|
|
if (control < 0)
|
|
goto out;
|
|
|
|
control &= ~DS1337_BIT_A1IE;
|
|
i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
|
|
|
|
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
|
|
}
|
|
|
|
out:
|
|
if (test_bit(HAS_ALARM, &ds1307->flags))
|
|
enable_irq(client->irq);
|
|
mutex_unlock(lock);
|
|
}
|
|
|
|
static irqreturn_t ds1307_irq(int irq, void *dev_id)
|
|
{
|
|
struct i2c_client *client = dev_id;
|
|
struct ds1307 *ds1307 = i2c_get_clientdata(client);
|
|
|
|
disable_irq_nosync(irq);
|
|
schedule_work(&ds1307->work);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static int ds1307_get_time(struct device *dev, struct rtc_time *t)
|
|
{
|
|
struct ds1307 *ds1307 = dev_get_drvdata(dev);
|
|
int tmp;
|
|
|
|
/* read the RTC date and time registers all at once */
|
|
tmp = ds1307->read_block_data(ds1307->client,
|
|
ds1307->offset, 7, ds1307->regs);
|
|
if (tmp != 7) {
|
|
dev_err(dev, "%s error %d\n", "read", tmp);
|
|
return -EIO;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs);
|
|
|
|
t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f);
|
|
t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f);
|
|
tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f;
|
|
t->tm_hour = bcd2bin(tmp);
|
|
t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1;
|
|
t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f);
|
|
tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f;
|
|
t->tm_mon = bcd2bin(tmp) - 1;
|
|
|
|
/* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */
|
|
t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100;
|
|
|
|
dev_dbg(dev, "%s secs=%d, mins=%d, "
|
|
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
|
|
"read", t->tm_sec, t->tm_min,
|
|
t->tm_hour, t->tm_mday,
|
|
t->tm_mon, t->tm_year, t->tm_wday);
|
|
|
|
/* initial clock setting can be undefined */
|
|
return rtc_valid_tm(t);
|
|
}
|
|
|
|
static int ds1307_set_time(struct device *dev, struct rtc_time *t)
|
|
{
|
|
struct ds1307 *ds1307 = dev_get_drvdata(dev);
|
|
int result;
|
|
int tmp;
|
|
u8 *buf = ds1307->regs;
|
|
|
|
dev_dbg(dev, "%s secs=%d, mins=%d, "
|
|
"hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
|
|
"write", t->tm_sec, t->tm_min,
|
|
t->tm_hour, t->tm_mday,
|
|
t->tm_mon, t->tm_year, t->tm_wday);
|
|
|
|
buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec);
|
|
buf[DS1307_REG_MIN] = bin2bcd(t->tm_min);
|
|
buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour);
|
|
buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1);
|
|
buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday);
|
|
buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1);
|
|
|
|
/* assume 20YY not 19YY */
|
|
tmp = t->tm_year - 100;
|
|
buf[DS1307_REG_YEAR] = bin2bcd(tmp);
|
|
|
|
switch (ds1307->type) {
|
|
case ds_1337:
|
|
case ds_1339:
|
|
case ds_3231:
|
|
buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY;
|
|
break;
|
|
case ds_1340:
|
|
buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
|
|
| DS1340_BIT_CENTURY;
|
|
break;
|
|
case mcp7941x:
|
|
/*
|
|
* these bits were cleared when preparing the date/time
|
|
* values and need to be set again before writing the
|
|
* buffer out to the device.
|
|
*/
|
|
buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST;
|
|
buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: %7ph\n", "write", buf);
|
|
|
|
result = ds1307->write_block_data(ds1307->client,
|
|
ds1307->offset, 7, buf);
|
|
if (result < 0) {
|
|
dev_err(dev, "%s error %d\n", "write", result);
|
|
return result;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ds1307 *ds1307 = i2c_get_clientdata(client);
|
|
int ret;
|
|
|
|
if (!test_bit(HAS_ALARM, &ds1307->flags))
|
|
return -EINVAL;
|
|
|
|
/* read all ALARM1, ALARM2, and status registers at once */
|
|
ret = ds1307->read_block_data(client,
|
|
DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
|
|
if (ret != 9) {
|
|
dev_err(dev, "%s error %d\n", "alarm read", ret);
|
|
return -EIO;
|
|
}
|
|
|
|
dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
|
|
"alarm read",
|
|
ds1307->regs[0], ds1307->regs[1],
|
|
ds1307->regs[2], ds1307->regs[3],
|
|
ds1307->regs[4], ds1307->regs[5],
|
|
ds1307->regs[6], ds1307->regs[7],
|
|
ds1307->regs[8]);
|
|
|
|
/*
|
|
* report alarm time (ALARM1); assume 24 hour and day-of-month modes,
|
|
* and that all four fields are checked matches
|
|
*/
|
|
t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
|
|
t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
|
|
t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
|
|
t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
|
|
t->time.tm_mon = -1;
|
|
t->time.tm_year = -1;
|
|
t->time.tm_wday = -1;
|
|
t->time.tm_yday = -1;
|
|
t->time.tm_isdst = -1;
|
|
|
|
/* ... and status */
|
|
t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
|
|
t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
|
|
|
|
dev_dbg(dev, "%s secs=%d, mins=%d, "
|
|
"hours=%d, mday=%d, enabled=%d, pending=%d\n",
|
|
"alarm read", t->time.tm_sec, t->time.tm_min,
|
|
t->time.tm_hour, t->time.tm_mday,
|
|
t->enabled, t->pending);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ds1307 *ds1307 = i2c_get_clientdata(client);
|
|
unsigned char *buf = ds1307->regs;
|
|
u8 control, status;
|
|
int ret;
|
|
|
|
if (!test_bit(HAS_ALARM, &ds1307->flags))
|
|
return -EINVAL;
|
|
|
|
dev_dbg(dev, "%s secs=%d, mins=%d, "
|
|
"hours=%d, mday=%d, enabled=%d, pending=%d\n",
|
|
"alarm set", t->time.tm_sec, t->time.tm_min,
|
|
t->time.tm_hour, t->time.tm_mday,
|
|
t->enabled, t->pending);
|
|
|
|
/* read current status of both alarms and the chip */
|
|
ret = ds1307->read_block_data(client,
|
|
DS1339_REG_ALARM1_SECS, 9, buf);
|
|
if (ret != 9) {
|
|
dev_err(dev, "%s error %d\n", "alarm write", ret);
|
|
return -EIO;
|
|
}
|
|
control = ds1307->regs[7];
|
|
status = ds1307->regs[8];
|
|
|
|
dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
|
|
"alarm set (old status)",
|
|
ds1307->regs[0], ds1307->regs[1],
|
|
ds1307->regs[2], ds1307->regs[3],
|
|
ds1307->regs[4], ds1307->regs[5],
|
|
ds1307->regs[6], control, status);
|
|
|
|
/* set ALARM1, using 24 hour and day-of-month modes */
|
|
buf[0] = bin2bcd(t->time.tm_sec);
|
|
buf[1] = bin2bcd(t->time.tm_min);
|
|
buf[2] = bin2bcd(t->time.tm_hour);
|
|
buf[3] = bin2bcd(t->time.tm_mday);
|
|
|
|
/* set ALARM2 to non-garbage */
|
|
buf[4] = 0;
|
|
buf[5] = 0;
|
|
buf[6] = 0;
|
|
|
|
/* optionally enable ALARM1 */
|
|
buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
|
|
if (t->enabled) {
|
|
dev_dbg(dev, "alarm IRQ armed\n");
|
|
buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */
|
|
}
|
|
buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
|
|
|
|
ret = ds1307->write_block_data(client,
|
|
DS1339_REG_ALARM1_SECS, 9, buf);
|
|
if (ret < 0) {
|
|
dev_err(dev, "can't set alarm time\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ds1307 *ds1307 = i2c_get_clientdata(client);
|
|
int ret;
|
|
|
|
if (!test_bit(HAS_ALARM, &ds1307->flags))
|
|
return -ENOTTY;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (enabled)
|
|
ret |= DS1337_BIT_A1IE;
|
|
else
|
|
ret &= ~DS1337_BIT_A1IE;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops ds13xx_rtc_ops = {
|
|
.read_time = ds1307_get_time,
|
|
.set_time = ds1307_set_time,
|
|
.read_alarm = ds1337_read_alarm,
|
|
.set_alarm = ds1337_set_alarm,
|
|
.alarm_irq_enable = ds1307_alarm_irq_enable,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static ssize_t
|
|
ds1307_nvram_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct i2c_client *client;
|
|
struct ds1307 *ds1307;
|
|
int result;
|
|
|
|
client = kobj_to_i2c_client(kobj);
|
|
ds1307 = i2c_get_clientdata(client);
|
|
|
|
if (unlikely(off >= ds1307->nvram->size))
|
|
return 0;
|
|
if ((off + count) > ds1307->nvram->size)
|
|
count = ds1307->nvram->size - off;
|
|
if (unlikely(!count))
|
|
return count;
|
|
|
|
result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
|
|
count, buf);
|
|
if (result < 0)
|
|
dev_err(&client->dev, "%s error %d\n", "nvram read", result);
|
|
return result;
|
|
}
|
|
|
|
static ssize_t
|
|
ds1307_nvram_write(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct i2c_client *client;
|
|
struct ds1307 *ds1307;
|
|
int result;
|
|
|
|
client = kobj_to_i2c_client(kobj);
|
|
ds1307 = i2c_get_clientdata(client);
|
|
|
|
if (unlikely(off >= ds1307->nvram->size))
|
|
return -EFBIG;
|
|
if ((off + count) > ds1307->nvram->size)
|
|
count = ds1307->nvram->size - off;
|
|
if (unlikely(!count))
|
|
return count;
|
|
|
|
result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
|
|
count, buf);
|
|
if (result < 0) {
|
|
dev_err(&client->dev, "%s error %d\n", "nvram write", result);
|
|
return result;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
static int ds1307_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ds1307 *ds1307;
|
|
int err = -ENODEV;
|
|
int tmp;
|
|
const struct chip_desc *chip = &chips[id->driver_data];
|
|
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
|
|
int want_irq = false;
|
|
unsigned char *buf;
|
|
struct ds1307_platform_data *pdata = client->dev.platform_data;
|
|
static const int bbsqi_bitpos[] = {
|
|
[ds_1337] = 0,
|
|
[ds_1339] = DS1339_BIT_BBSQI,
|
|
[ds_3231] = DS3231_BIT_BBSQW,
|
|
};
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
|
|
&& !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
|
|
return -EIO;
|
|
|
|
ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL);
|
|
if (!ds1307)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, ds1307);
|
|
|
|
ds1307->client = client;
|
|
ds1307->type = id->driver_data;
|
|
|
|
if (pdata && pdata->trickle_charger_setup && chip->trickle_charger_reg)
|
|
i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
|
|
DS13XX_TRICKLE_CHARGER_MAGIC | pdata->trickle_charger_setup);
|
|
|
|
buf = ds1307->regs;
|
|
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
|
|
ds1307->read_block_data = ds1307_native_smbus_read_block_data;
|
|
ds1307->write_block_data = ds1307_native_smbus_write_block_data;
|
|
} else {
|
|
ds1307->read_block_data = ds1307_read_block_data;
|
|
ds1307->write_block_data = ds1307_write_block_data;
|
|
}
|
|
|
|
switch (ds1307->type) {
|
|
case ds_1337:
|
|
case ds_1339:
|
|
case ds_3231:
|
|
/* get registers that the "rtc" read below won't read... */
|
|
tmp = ds1307->read_block_data(ds1307->client,
|
|
DS1337_REG_CONTROL, 2, buf);
|
|
if (tmp != 2) {
|
|
dev_dbg(&client->dev, "read error %d\n", tmp);
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
/* oscillator off? turn it on, so clock can tick. */
|
|
if (ds1307->regs[0] & DS1337_BIT_nEOSC)
|
|
ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
|
|
|
|
/*
|
|
* Using IRQ? Disable the square wave and both alarms.
|
|
* For some variants, be sure alarms can trigger when we're
|
|
* running on Vbackup (BBSQI/BBSQW)
|
|
*/
|
|
if (ds1307->client->irq > 0 && chip->alarm) {
|
|
INIT_WORK(&ds1307->work, ds1307_work);
|
|
|
|
ds1307->regs[0] |= DS1337_BIT_INTCN
|
|
| bbsqi_bitpos[ds1307->type];
|
|
ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
|
|
|
|
want_irq = true;
|
|
}
|
|
|
|
i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
|
|
ds1307->regs[0]);
|
|
|
|
/* oscillator fault? clear flag, and warn */
|
|
if (ds1307->regs[1] & DS1337_BIT_OSF) {
|
|
i2c_smbus_write_byte_data(client, DS1337_REG_STATUS,
|
|
ds1307->regs[1] & ~DS1337_BIT_OSF);
|
|
dev_warn(&client->dev, "SET TIME!\n");
|
|
}
|
|
break;
|
|
|
|
case rx_8025:
|
|
tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
|
|
RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
|
|
if (tmp != 2) {
|
|
dev_dbg(&client->dev, "read error %d\n", tmp);
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
/* oscillator off? turn it on, so clock can tick. */
|
|
if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
|
|
ds1307->regs[1] |= RX8025_BIT_XST;
|
|
i2c_smbus_write_byte_data(client,
|
|
RX8025_REG_CTRL2 << 4 | 0x08,
|
|
ds1307->regs[1]);
|
|
dev_warn(&client->dev,
|
|
"oscillator stop detected - SET TIME!\n");
|
|
}
|
|
|
|
if (ds1307->regs[1] & RX8025_BIT_PON) {
|
|
ds1307->regs[1] &= ~RX8025_BIT_PON;
|
|
i2c_smbus_write_byte_data(client,
|
|
RX8025_REG_CTRL2 << 4 | 0x08,
|
|
ds1307->regs[1]);
|
|
dev_warn(&client->dev, "power-on detected\n");
|
|
}
|
|
|
|
if (ds1307->regs[1] & RX8025_BIT_VDET) {
|
|
ds1307->regs[1] &= ~RX8025_BIT_VDET;
|
|
i2c_smbus_write_byte_data(client,
|
|
RX8025_REG_CTRL2 << 4 | 0x08,
|
|
ds1307->regs[1]);
|
|
dev_warn(&client->dev, "voltage drop detected\n");
|
|
}
|
|
|
|
/* make sure we are running in 24hour mode */
|
|
if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
|
|
u8 hour;
|
|
|
|
/* switch to 24 hour mode */
|
|
i2c_smbus_write_byte_data(client,
|
|
RX8025_REG_CTRL1 << 4 | 0x08,
|
|
ds1307->regs[0] |
|
|
RX8025_BIT_2412);
|
|
|
|
tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
|
|
RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
|
|
if (tmp != 2) {
|
|
dev_dbg(&client->dev, "read error %d\n", tmp);
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
/* correct hour */
|
|
hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
|
|
if (hour == 12)
|
|
hour = 0;
|
|
if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
|
|
hour += 12;
|
|
|
|
i2c_smbus_write_byte_data(client,
|
|
DS1307_REG_HOUR << 4 | 0x08,
|
|
hour);
|
|
}
|
|
break;
|
|
case ds_1388:
|
|
ds1307->offset = 1; /* Seconds starts at 1 */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
read_rtc:
|
|
/* read RTC registers */
|
|
tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf);
|
|
if (tmp != 8) {
|
|
dev_dbg(&client->dev, "read error %d\n", tmp);
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
/*
|
|
* minimal sanity checking; some chips (like DS1340) don't
|
|
* specify the extra bits as must-be-zero, but there are
|
|
* still a few values that are clearly out-of-range.
|
|
*/
|
|
tmp = ds1307->regs[DS1307_REG_SECS];
|
|
switch (ds1307->type) {
|
|
case ds_1307:
|
|
case m41t00:
|
|
/* clock halted? turn it on, so clock can tick. */
|
|
if (tmp & DS1307_BIT_CH) {
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
|
|
dev_warn(&client->dev, "SET TIME!\n");
|
|
goto read_rtc;
|
|
}
|
|
break;
|
|
case ds_1338:
|
|
/* clock halted? turn it on, so clock can tick. */
|
|
if (tmp & DS1307_BIT_CH)
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
|
|
|
|
/* oscillator fault? clear flag, and warn */
|
|
if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) {
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL,
|
|
ds1307->regs[DS1307_REG_CONTROL]
|
|
& ~DS1338_BIT_OSF);
|
|
dev_warn(&client->dev, "SET TIME!\n");
|
|
goto read_rtc;
|
|
}
|
|
break;
|
|
case ds_1340:
|
|
/* clock halted? turn it on, so clock can tick. */
|
|
if (tmp & DS1340_BIT_nEOSC)
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0);
|
|
|
|
tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
|
|
if (tmp < 0) {
|
|
dev_dbg(&client->dev, "read error %d\n", tmp);
|
|
err = -EIO;
|
|
goto exit_free;
|
|
}
|
|
|
|
/* oscillator fault? clear flag, and warn */
|
|
if (tmp & DS1340_BIT_OSF) {
|
|
i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
|
|
dev_warn(&client->dev, "SET TIME!\n");
|
|
}
|
|
break;
|
|
case mcp7941x:
|
|
/* make sure that the backup battery is enabled */
|
|
if (!(ds1307->regs[DS1307_REG_WDAY] & MCP7941X_BIT_VBATEN)) {
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_WDAY,
|
|
ds1307->regs[DS1307_REG_WDAY]
|
|
| MCP7941X_BIT_VBATEN);
|
|
}
|
|
|
|
/* clock halted? turn it on, so clock can tick. */
|
|
if (!(tmp & MCP7941X_BIT_ST)) {
|
|
i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
|
|
MCP7941X_BIT_ST);
|
|
dev_warn(&client->dev, "SET TIME!\n");
|
|
goto read_rtc;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
tmp = ds1307->regs[DS1307_REG_HOUR];
|
|
switch (ds1307->type) {
|
|
case ds_1340:
|
|
case m41t00:
|
|
/*
|
|
* NOTE: ignores century bits; fix before deploying
|
|
* systems that will run through year 2100.
|
|
*/
|
|
break;
|
|
case rx_8025:
|
|
break;
|
|
default:
|
|
if (!(tmp & DS1307_BIT_12HR))
|
|
break;
|
|
|
|
/*
|
|
* Be sure we're in 24 hour mode. Multi-master systems
|
|
* take note...
|
|
*/
|
|
tmp = bcd2bin(tmp & 0x1f);
|
|
if (tmp == 12)
|
|
tmp = 0;
|
|
if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
|
|
tmp += 12;
|
|
i2c_smbus_write_byte_data(client,
|
|
ds1307->offset + DS1307_REG_HOUR,
|
|
bin2bcd(tmp));
|
|
}
|
|
|
|
ds1307->rtc = rtc_device_register(client->name, &client->dev,
|
|
&ds13xx_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(ds1307->rtc)) {
|
|
err = PTR_ERR(ds1307->rtc);
|
|
dev_err(&client->dev,
|
|
"unable to register the class device\n");
|
|
goto exit_free;
|
|
}
|
|
|
|
if (want_irq) {
|
|
err = request_irq(client->irq, ds1307_irq, IRQF_SHARED,
|
|
ds1307->rtc->name, client);
|
|
if (err) {
|
|
dev_err(&client->dev,
|
|
"unable to request IRQ!\n");
|
|
goto exit_irq;
|
|
}
|
|
|
|
device_set_wakeup_capable(&client->dev, 1);
|
|
set_bit(HAS_ALARM, &ds1307->flags);
|
|
dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
|
|
}
|
|
|
|
if (chip->nvram_size) {
|
|
ds1307->nvram = kzalloc(sizeof(struct bin_attribute),
|
|
GFP_KERNEL);
|
|
if (!ds1307->nvram) {
|
|
err = -ENOMEM;
|
|
goto exit_nvram;
|
|
}
|
|
ds1307->nvram->attr.name = "nvram";
|
|
ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR;
|
|
sysfs_bin_attr_init(ds1307->nvram);
|
|
ds1307->nvram->read = ds1307_nvram_read,
|
|
ds1307->nvram->write = ds1307_nvram_write,
|
|
ds1307->nvram->size = chip->nvram_size;
|
|
ds1307->nvram_offset = chip->nvram_offset;
|
|
err = sysfs_create_bin_file(&client->dev.kobj, ds1307->nvram);
|
|
if (err) {
|
|
kfree(ds1307->nvram);
|
|
goto exit_nvram;
|
|
}
|
|
set_bit(HAS_NVRAM, &ds1307->flags);
|
|
dev_info(&client->dev, "%zu bytes nvram\n", ds1307->nvram->size);
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_nvram:
|
|
exit_irq:
|
|
rtc_device_unregister(ds1307->rtc);
|
|
exit_free:
|
|
kfree(ds1307);
|
|
return err;
|
|
}
|
|
|
|
static int ds1307_remove(struct i2c_client *client)
|
|
{
|
|
struct ds1307 *ds1307 = i2c_get_clientdata(client);
|
|
|
|
if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) {
|
|
free_irq(client->irq, client);
|
|
cancel_work_sync(&ds1307->work);
|
|
}
|
|
|
|
if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) {
|
|
sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);
|
|
kfree(ds1307->nvram);
|
|
}
|
|
|
|
rtc_device_unregister(ds1307->rtc);
|
|
kfree(ds1307);
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver ds1307_driver = {
|
|
.driver = {
|
|
.name = "rtc-ds1307",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ds1307_probe,
|
|
.remove = ds1307_remove,
|
|
.id_table = ds1307_id,
|
|
};
|
|
|
|
module_i2c_driver(ds1307_driver);
|
|
|
|
MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips");
|
|
MODULE_LICENSE("GPL");
|