static void ds1374_set_work(struct work_struct *work)
{
ulong t1, t2;
int limit = 10; /* arbitrary retry limit */
t1 = new_time;
mutex_lock(&ds1374_mutex);
/*
* Since the writes are being performed one byte at a time using
* the SMBus vs a 4-byte i2c transfer, there is a chance that a
* carry will occur during the write. To detect this, the write
* value is read back and compared.
*/
do {
ds1374_write_rtc(t1);
t2 = ds1374_read_rtc();
} while (t1 != t2 && limit--);
mutex_unlock(&ds1374_mutex);
if (t1 != t2)
dev_warn(&save_client->dev,
"can't confirm time set from rtc chip\n");
}
/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
static void ds1374_wdt_ping(void)
{
u32 val;
int ret = 0;
ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
if (ret)
pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
}
static int ds1374_read_time(struct device *dev, struct rtc_time *time)
{
struct i2c_client *client = to_i2c_client(dev);
u32 itime;
int ret;
ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
if (!ret)
rtc_time_to_tm(itime, time);
return ret;
}
static int ds1374_read_time(struct device *dev, struct rtc_time *time)
{
struct ds1374 *ds1374 = dev_get_drvdata(dev);
u32 itime;
int ret;
ret = ds1374_read_rtc(&ds1374->client, &itime, DS1374_REG_TOD0, 4);
if (!ret)
rtc_time_to_tm(itime, time);
return ret;
}
/* The ds1374 has a decrementer for an alarm, rather than a comparator.
* If the time of day is changed, then the alarm will need to be
* reset.
*/
static int ds1374_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds1374 *ds1374 = i2c_get_clientdata(client);
u32 now, cur_alarm;
int cr, sr;
int ret = 0;
if (client->irq <= 0)
return -EINVAL;
mutex_lock(&ds1374->mutex);
cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
if (ret < 0)
goto out;
sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
if (ret < 0)
goto out;
ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
if (ret)
goto out;
ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
if (ret)
goto out;
rtc_time_to_tm(now + cur_alarm, &alarm->time);
alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
alarm->pending = !!(sr & DS1374_REG_SR_AF);
out:
mutex_unlock(&ds1374->mutex);
return ret;
}
