From: "amatus@ocgnet.org" <amatus@ocgnet.org>
To: torvalds@osdl.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] m41t00: fix bitmasks when writing to chip
Date: Wed, 12 Apr 2006 11:58:21 -0500 [thread overview]
Message-ID: <20060412165821.GA3025@login.ocgnet.org> (raw)
From: David Barksdale <amatus@ocgnet.org>
This patch fixes the bitmasks used when writing to the M41T00 registers.
The origional code used a mask of 0x7f when writing to each register,
this is incorrect and probably the result of a copy-paste error. As a
result years from 1980 to 1999 will be read back as 2000 to 2019.
Signed-off-by: David Barksdale <amatus@ocgnet.org>
---
The following patch is against the 2.6.16.4 linux kernel
--- linux-2.6.16.4/drivers/i2c/chips/m41t00.c.orig 2006-04-12 11:28:04.740793700 -0500
+++ linux-2.6.16.4/drivers/i2c/chips/m41t00.c 2006-04-12 11:29:58.093959100 -0500
@@ -129,13 +129,13 @@ m41t00_set_tlet(ulong arg)
if ((i2c_smbus_write_byte_data(save_client, 0, tm.tm_sec & 0x7f) < 0)
|| (i2c_smbus_write_byte_data(save_client, 1, tm.tm_min & 0x7f)
< 0)
- || (i2c_smbus_write_byte_data(save_client, 2, tm.tm_hour & 0x7f)
+ || (i2c_smbus_write_byte_data(save_client, 2, tm.tm_hour & 0x3f)
< 0)
- || (i2c_smbus_write_byte_data(save_client, 4, tm.tm_mday & 0x7f)
+ || (i2c_smbus_write_byte_data(save_client, 4, tm.tm_mday & 0x3f)
< 0)
- || (i2c_smbus_write_byte_data(save_client, 5, tm.tm_mon & 0x7f)
+ || (i2c_smbus_write_byte_data(save_client, 5, tm.tm_mon & 0x1f)
< 0)
- || (i2c_smbus_write_byte_data(save_client, 6, tm.tm_year & 0x7f)
+ || (i2c_smbus_write_byte_data(save_client, 6, tm.tm_year & 0xff)
< 0))
dev_warn(&save_client->dev,"m41t00: can't write to rtc chip\n");
reply other threads:[~2006-04-12 16:58 UTC|newest]
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