hwmon: (lm78/w83781d) Probe fewer I2C addresses

We've never seen any device supported by the lm78 or w83781d driver at
addresses 0x20-0x27, so let's stop probing these addresses. Extra probes cost
time, and have potential for confusing or misdetecting other I2C devices.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

4 files changed, 10 insertions, 13 deletions

diff --git a/Documentation/hwmon/lm78 b/Documentation/hwmon/lm78
index dfc318a60fd4..60932e26abaa 100644
--- a/Documentation/hwmon/lm78
+++ b/Documentation/hwmon/lm78
@@ -4,12 +4,12 @@ Kernel driver lm78
 Supported chips:
   * National Semiconductor LM78 / LM78-J
     Prefix: 'lm78'
-    Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
+    Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports)
     Datasheet: Publicly available at the National Semiconductor website
                http://www.national.com/
   * National Semiconductor LM79
     Prefix: 'lm79'
-    Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
+    Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports)
     Datasheet: Publicly available at the National Semiconductor website
                http://www.national.com/
 
diff --git a/Documentation/hwmon/w83781d b/Documentation/hwmon/w83781d
index b1e9f80098ee..dbeadb269a69 100644
--- a/Documentation/hwmon/w83781d
+++ b/Documentation/hwmon/w83781d
@@ -4,11 +4,11 @@ Kernel driver w83781d
 Supported chips:
   * Winbond W83781D
     Prefix: 'w83781d'
-    Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
+    Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports)
     Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/w83781d.pdf
   * Winbond W83782D
     Prefix: 'w83782d'
-    Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
+    Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports)
     Datasheet: http://www.winbond.com/PDF/sheet/w83782d.pdf
   * Winbond W83783S
     Prefix: 'w83783s'
@@ -16,7 +16,7 @@ Supported chips:
     Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/w83783s.pdf
   * Winbond W83627HF
     Prefix: 'w83627hf'
-    Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
+    Addresses scanned: I2C 0x28 - 0x2f, ISA 0x290 (8 I/O ports)
     Datasheet: http://www.winbond.com/PDF/sheet/w83627hf.pdf
   * Asus AS99127F
     Prefix: 'as99127f'
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
index 3f7055ee679f..934378eb4f8f 100644
--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -37,10 +37,8 @@
 static struct platform_device *pdev;
 
 /* Addresses to scan */
-static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
-                                        0x25, 0x26, 0x27, 0x28, 0x29,
-                                        0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
-                                        0x2f, I2C_CLIENT_END };
+static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
+                                       0x2e, 0x2f, I2C_CLIENT_END };
 static unsigned short isa_address = 0x290;
 
 /* Insmod parameters */
diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index e0fa7520400d..d38b9ede3abd 100644
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -54,9 +54,8 @@
 static struct platform_device *pdev;
 
 /* Addresses to scan */
-static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
-                                        0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
-                                        0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
+static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
+                                       0x2e, 0x2f, I2C_CLIENT_END };
 static unsigned short isa_address = 0x290;
 
 /* Insmod parameters */
@@ -1270,7 +1269,7 @@ w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
                         kind = w83783s;
                 else if (val1 == 0x21 && vendid == winbond)
                         kind = w83627hf;
-                else if (val1 == 0x31 && address >= 0x28)
+                else if (val1 == 0x31)
                         kind = as99127f;
                 else {
                         if (kind == 0)