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path: root/drivers/rtc/rtc-ds1307.c
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Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
-rw-r--r--drivers/rtc/rtc-ds1307.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index b2005b44e4f7..62b0763b7b9a 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -34,6 +34,7 @@ enum ds_type {
ds_1388,
ds_3231,
m41t00,
+ mcp7941x,
rx_8025,
// rs5c372 too? different address...
};
@@ -43,6 +44,7 @@ enum ds_type {
#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 */
@@ -50,6 +52,7 @@ enum ds_type {
# 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 */
@@ -137,6 +140,8 @@ static const struct chip_desc chips[] = {
},
[m41t00] = {
},
+[mcp7941x] = {
+},
[rx_8025] = {
}, };
@@ -149,6 +154,7 @@ static const struct i2c_device_id ds1307_id[] = {
{ "ds1340", ds_1340 },
{ "ds3231", ds_3231 },
{ "m41t00", m41t00 },
+ { "mcp7941x", mcp7941x },
{ "pt7c4338", ds_1307 },
{ "rx8025", rx_8025 },
{ }
@@ -365,6 +371,10 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN
| DS1340_BIT_CENTURY;
break;
+ case mcp7941x:
+ buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST;
+ buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN;
+ break;
default:
break;
}
@@ -809,6 +819,23 @@ read_rtc:
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;
case rx_8025:
case ds_1337:
case ds_1339:
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