Merge branch 'akpm' (Andrew's incoming - part two)

[pandora-kernel.git] / drivers / rtc / rtc-ds1307.c

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index b2005b4..62b0763 100644 (file)
--- 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;
        }
@@ -808,6 +818,23 @@ read_rtc:
                        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;
        case rx_8025:
        case ds_1337: