* Driver data (common to all clients)
*/
static struct i2c_driver ds1337_driver = {
- .owner = THIS_MODULE,
- .name = "ds1337",
- .flags = I2C_DF_NOTIFY,
+ .driver = {
+ .name = "ds1337",
+ },
.attach_adapter = ds1337_attach_adapter,
.detach_client = ds1337_detach_client,
.command = ds1337_command,
static void ds1337_init_client(struct i2c_client *client)
{
- s32 val;
+ u8 status, control;
- /* Ensure that device is set in 24-hour mode */
- val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR);
- if ((val >= 0) && (val & (1 << 6)))
- i2c_smbus_write_byte_data(client, DS1337_REG_HOUR,
- val & 0x3f);
+ /* On some boards, the RTC isn't configured by boot firmware.
+ * Handle that case by starting/configuring the RTC now.
+ */
+ status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
+ control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+
+ if ((status & 0x80) || (control & 0x80)) {
+ /* RTC not running */
+ u8 buf[1+16]; /* First byte is interpreted as address */
+ struct i2c_msg msg[1];
+
+ dev_dbg(&client->dev, "%s: RTC not running!\n", __FUNCTION__);
+
+ /* Initialize all, including STATUS and CONTROL to zero */
+ memset(buf, 0, sizeof(buf));
+
+ /* Write valid values in the date/time registers */
+ buf[1+DS1337_REG_DAY] = 1;
+ buf[1+DS1337_REG_DATE] = 1;
+ buf[1+DS1337_REG_MONTH] = 1;
+
+ msg[0].addr = client->addr;
+ msg[0].flags = 0;
+ msg[0].len = sizeof(buf);
+ msg[0].buf = &buf[0];
+
+ i2c_transfer(client->adapter, msg, 1);
+ } else {
+ /* Running: ensure that device is set in 24-hour mode */
+ s32 val;
+
+ val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR);
+ if ((val >= 0) && (val & (1 << 6)))
+ i2c_smbus_write_byte_data(client, DS1337_REG_HOUR,
+ val & 0x3f);
+ }
}
static int ds1337_detach_client(struct i2c_client *client)