Patch for ds1337 i2c driver:
Add code to handle case where board firmware does not start the
RTC.
This patch was contributed by Michael Burian.
Signed-off-by: Michael Burian <[email protected]>
Signed-off-by: James Chapman <[email protected]>
--
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development
Add code to handle case where board firmware does not start the
RTC.
This patch was contributed by Michael Burian.
Signed-off-by: Michael Burian <[email protected]>
Signed-off-by: James Chapman <[email protected]>
Index: linux-2.6.14/drivers/i2c/chips/ds1337.c
===================================================================
--- linux-2.6.14.orig/drivers/i2c/chips/ds1337.c 2005-11-02 19:30:17.000000000 +0000
+++ linux-2.6.14/drivers/i2c/chips/ds1337.c 2005-11-03 20:14:58.981735046 +0000
@@ -149,12 +149,25 @@
u8 buf[8];
u8 val;
struct i2c_msg msg[1];
+ u8 status, control;
+ int i;
if (!dt) {
dev_dbg(&client->dev, "%s: EINVAL: dt=NULL\n", __FUNCTION__);
return -EINVAL;
}
+ status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
+ control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+
+ /* On some boards, the RTC isn't configured by boot firmware.
+ * Handle that case by starting/configuring the RTC now.
+ */
+ if ((status & 0x80) || (control & 0x80))
+ /* Initialize all, including STATUS and CONTROL to zero */
+ for (i = 0; i < 16; i++)
+ i2c_smbus_write_byte_data(client, i, 0);
+
dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n", __FUNCTION__,
dt->tm_sec, dt->tm_min, dt->tm_hour,
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