1 files changed, 33 insertions, 8 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 2c4a65302a9d..8a6f9a9f9cb8 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -31,6 +31,8 @@ enum ds_type {
         ds_1338,
         ds_1339,
         ds_1340,
+        ds_1388,
+        ds_3231,
         m41t00,
         rx_8025,
         // rs5c372 too?  different address...
@@ -66,6 +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
@@ -94,6 +97,7 @@ enum ds_type {
 
 
 struct ds1307 {
+        u8                      offset; /* register's offset */
         u8                      regs[11];
         enum ds_type            type;
         unsigned long           flags;
@@ -128,6 +132,9 @@ static const struct chip_desc chips[] = {
 },
 [ds_1340] = {
 },
+[ds_3231] = {
+        .alarm          = 1,
+},
 [m41t00] = {
 },
 [rx_8025] = {
@@ -138,7 +145,9 @@ static const struct i2c_device_id ds1307_id[] = {
         { "ds1337", ds_1337 },
         { "ds1338", ds_1338 },
         { "ds1339", ds_1339 },
+        { "ds1388", ds_1388 },
         { "ds1340", ds_1340 },
+        { "ds3231", ds_3231 },
         { "m41t00", m41t00 },
         { "rx8025", rx_8025 },
         { }
@@ -291,7 +300,7 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 
         /* read the RTC date and time registers all at once */
         tmp = ds1307->read_block_data(ds1307->client,
-                DS1307_REG_SECS, 7, ds1307->regs);
+                ds1307->offset, 7, ds1307->regs);
         if (tmp != 7) {
                 dev_err(dev, "%s error %d\n", "read", tmp);
                 return -EIO;
@@ -353,6 +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:
@@ -367,7 +377,8 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
                 "write", buf[0], buf[1], buf[2], buf[3],
                 buf[4], buf[5], buf[6]);
 
-        result = ds1307->write_block_data(ds1307->client, 0, 7, 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;
@@ -624,6 +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))
@@ -632,9 +648,12 @@ static int __devinit ds1307_probe(struct i2c_client *client,
         if (!(ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL)))
                 return -ENOMEM;
 
-        ds1307->client = client;
         i2c_set_clientdata(client, ds1307);
-        ds1307->type = id->driver_data;
+
+        ds1307->client  = client;
+        ds1307->type    = id->driver_data;
+        ds1307->offset  = 0;
+
         buf = ds1307->regs;
         if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
                 ds1307->read_block_data = i2c_smbus_read_i2c_block_data;
@@ -647,6 +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);
@@ -666,12 +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);
                 }
 
@@ -751,6 +771,9 @@ static int __devinit ds1307_probe(struct i2c_client *client,
                                                   hour);
                 }
                 break;
+        case ds_1388:
+                ds1307->offset = 1; /* Seconds starts at 1 */
+                break;
         default:
                 break;
         }
@@ -814,6 +837,8 @@ read_rtc:
         case rx_8025:
         case ds_1337:
         case ds_1339:
+        case ds_1388:
+        case ds_3231:
                 break;
         }