[patch 47/74] hwmon: (smsc47m1) Differentiate between LPC47M233 and LPC47M292

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jean Delvare <khali@xxxxxxxxxxxx>

commit 1b54ab450b180eaeeb0eee6f0f64349246a22c14 upstream.

The SMSC LPC47M233 and LPC47M292 chips have the same device ID but
are not compatible.

Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Juerg Haefliger <juergh@xxxxxxxxx>
Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/hwmon/smsc47m1.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -86,6 +86,7 @@ superio_exit(void)
 #define SUPERIO_REG_ACT		0x30
 #define SUPERIO_REG_BASE	0x60
 #define SUPERIO_REG_DEVID	0x20
+#define SUPERIO_REG_DEVREV	0x21
 
 /* Logical device registers */
 
@@ -429,6 +430,9 @@ static int __init smsc47m1_find(unsigned
 	 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
 	 * supports a 3rd fan, and the pin configuration registers are
 	 * unfortunately different.
+	 * The LPC47M233 has the same device id (0x6B) but is not compatible.
+	 * We check the high bit of the device revision register to
+	 * differentiate them.
 	 */
 	switch (val) {
 	case 0x51:
@@ -448,6 +452,13 @@ static int __init smsc47m1_find(unsigned
 		sio_data->type = smsc47m1;
 		break;
 	case 0x6B:
+		if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
+			pr_debug(DRVNAME ": "
+				 "Found SMSC LPC47M233, unsupported\n");
+			superio_exit();
+			return -ENODEV;
+		}
+
 		pr_info(DRVNAME ": Found SMSC LPC47M292\n");
 		sio_data->type = smsc47m2;
 		break;


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