rtc: add initial support for mcp7941x parts

Add initial support for the microchip mcp7941x series of real time clocks.

The mcp7941x series is generally compatible with the ds1307 and ds1337 rtc
devices from dallas semiconductor.  minor differences include a backup
battery enable bit, and the polarity of the oscillator enable bit.

Signed-off-by: David Anders <danders.dev@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;
        }
@@ -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: