linux-kernel - [PATCH] rtc-ds1307 : ds

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Date:	Wed, 16 Jan 2008 17:05:05 +0100
From:	frederic RODO <f.rodo@...-technologies.fr>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] rtc-ds1307 : ds_1340 change init

Hi,

this patch change the initialization of ds1340 according to the FIXME.

It was tested on a arm custom board, this is the log when I plug the 
board without backup battery.

Linux version 2.6.24-rc7 (fredo@...-devhard) (gcc version 3.4.6) #22 Tue 
Jan 15 19:45:16 CET 2008
.......
Kernel command line: debug
.......
atmel_spi atmel_spi.1: Atmel SPI Controller at 0xfffcc000 (irq 13)
i2c /dev entries driver
rtc-ds1307 0-0068: SET TIME!
rtc-ds1307 0-0068: rtc core: registered ds1340 as rtc0
i2c-gpio i2c-gpio: using pins 55 (SDA) and 56 (SCL)
.......

If you have any comments please CC me

bye.



Signed-off-by: Frederic RODO <f.rodo@...-technologies.fr>

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index bc1c7fe..3a86898 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -392,6 +392,33 @@ static int __devinit ds1307_probe(struct i2c_client 
*client)
  			dev_warn(&client->dev, "SET TIME!\n");
  		}
  		break;
+	case ds_1340:
+		/* Test nEOSC before OSF */
+		tmp = i2c_smbus_read_byte_data(client, DS1307_REG_SECS);
+		if (tmp < 0) {
+			pr_debug("read error %d\n", tmp);
+			err = -EIO;
+			goto exit_free;
+		}
+
+		/* oscillator off?  turn it on, so clock can tick. */
+		if (tmp & DS1340_BIT_nEOSC)
+			i2c_smbus_write_byte_data(client, DS1307_REG_SECS,
+				tmp & ~DS1340_BIT_nEOSC);
+
+		tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG);
+		if (tmp < 0) {
+			pr_debug("read error %d\n", tmp);
+			err = -EIO;
+			goto exit_free;
+		}
+
+		/* oscillator fault?  clear flag, and warn */
+		if (tmp & DS1340_BIT_OSF) {
+			i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0);
+			dev_warn(&client->dev, "SET TIME!\n");
+		}
+		break;
  	default:
  		break;
  	}
@@ -412,11 +439,6 @@ read_rtc:
  	 */
  	tmp = ds1307->regs[DS1307_REG_SECS];
  	switch (ds1307->type) {
-	case ds_1340:
-		/* FIXME read register with DS1340_BIT_OSF, use that to
-		 * trigger the "set time" warning (*after* restarting the
-		 * oscillator!) instead of this weaker ds1307/m41t00 test.
-		 */
  	case ds_1307:
  	case m41t00:
  		/* clock halted?  turn it on, so clock can tick. */
@@ -442,6 +464,7 @@ read_rtc:
  		break;
  	case ds_1337:
  	case ds_1339:
+	case ds_1340:
  		break;
  	}



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