hwmon: (dme1737) probe all addresses

This patch adds a module load parameter to enable probing of
non-standard LPC addresses 0x162e and 0x164e when scanning for supported
ISA chips.

Signed-Off-By: Juerg Haefliger <juergh at gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/Documentation/hwmon/dme1737 b/Documentation/hwmon/dme1737
index 8f446070e64a..b1fe00999439 100644
--- a/Documentation/hwmon/dme1737
+++ b/Documentation/hwmon/dme1737
@@ -22,6 +22,10 @@ Module Parameters
                         and PWM output control functions. Using this parameter
                         shouldn't be required since the BIOS usually takes care
                         of this.
+* probe_all_addr: bool  Include non-standard LPC addresses 0x162e and 0x164e
+                        when probing for ISA devices. This is required for the
+                        following boards:
+                        - VIA EPIA SN18000
 
 Note that there is no need to use this parameter if the driver loads without
 complaining. The driver will say so if it is necessary.
diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
index c24b5b370daa..5a3d41fbdb3c 100644
--- a/drivers/hwmon/dme1737.c
+++ b/drivers/hwmon/dme1737.c
@@ -48,6 +48,11 @@ static unsigned short force_id;
 module_param(force_id, ushort, 0);
 MODULE_PARM_DESC(force_id, "Override the detected device ID");
 
+static int probe_all_addr;
+module_param(probe_all_addr, bool, 0);
+MODULE_PARM_DESC(probe_all_addr, "Include probing of non-standard LPC "
+                 "addresses");
+
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = {0x2c, 0x2d, 0x2e, I2C_CLIENT_END};
 
@@ -2430,7 +2435,10 @@ static int __init dme1737_init(void)
         }
 
         if (dme1737_isa_detect(0x2e, &addr) &&
-            dme1737_isa_detect(0x4e, &addr)) {
+            dme1737_isa_detect(0x4e, &addr) &&
+            (!probe_all_addr ||
+             (dme1737_isa_detect(0x162e, &addr) &&
+              dme1737_isa_detect(0x164e, &addr)))) {
                 /* Return 0 if we didn't find an ISA device */
                 return 0;
         }