diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1307.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 52e2427e5a95..8a6f9a9f9cb8 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -32,6 +32,7 @@ enum ds_type { ds_1339, ds_1340, ds_1388, + ds_3231, m41t00, rx_8025, // rs5c372 too? different address... @@ -67,6 +68,7 @@ enum ds_type { #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 @@ -130,6 +132,9 @@ static const struct chip_desc chips[] = { }, [ds_1340] = { }, +[ds_3231] = { + .alarm = 1, +}, [m41t00] = { }, [rx_8025] = { @@ -142,6 +147,7 @@ static const struct i2c_device_id ds1307_id[] = { { "ds1339", ds_1339 }, { "ds1388", ds_1388 }, { "ds1340", ds_1340 }, + { "ds3231", ds_3231 }, { "m41t00", m41t00 }, { "rx8025", rx_8025 }, { } @@ -356,6 +362,7 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t) switch (ds1307->type) { case ds_1337: case ds_1339: + case ds_3231: buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY; break; case ds_1340: @@ -628,6 +635,11 @@ static int __devinit ds1307_probe(struct i2c_client *client, struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); int want_irq = false; unsigned char *buf; + 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)) @@ -654,6 +666,7 @@ static int __devinit ds1307_probe(struct i2c_client *client, switch (ds1307->type) { case ds_1337: case ds_1339: + case ds_3231: /* has IRQ? */ if (ds1307->client->irq > 0 && chip->alarm) { INIT_WORK(&ds1307->work, ds1307_work); @@ -673,12 +686,12 @@ static int __devinit ds1307_probe(struct i2c_client *client, ds1307->regs[0] &= ~DS1337_BIT_nEOSC; /* Using IRQ? Disable the square wave and both alarms. - * For ds1339, be sure alarms can trigger when we're - * running on Vbackup (BBSQI); we assume ds1337 will - * ignore that bit + * For some variants, be sure alarms can trigger when we're + * running on Vbackup (BBSQI/BBSQW) */ if (want_irq) { - ds1307->regs[0] |= DS1337_BIT_INTCN | DS1339_BIT_BBSQI; + ds1307->regs[0] |= DS1337_BIT_INTCN + | bbsqi_bitpos[ds1307->type]; ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); } @@ -825,6 +838,7 @@ read_rtc: case ds_1337: case ds_1339: case ds_1388: + case ds_3231: break; } |