hwmon: (lm87) Add support for the Analog Devices ADM1024

It happens that the Analog Devices ADM1024 is fully compatible with
the National Semiconductor LM87, so support for the former can easily
be added to the lm87 driver.

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

2 files changed, 21 insertions, 8 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a2187df5cc78..af43d566d770 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -433,12 +433,12 @@ config SENSORS_LM85
           will be called lm85.
 
 config SENSORS_LM87
-        tristate "National Semiconductor LM87"
+        tristate "National Semiconductor LM87 and compatibles"
         depends on I2C
         select HWMON_VID
         help
           If you say yes here you get support for National Semiconductor LM87
-          sensor chips.
+          and Analog Devices ADM1024 sensor chips.
 
           This driver can also be built as a module.  If so, the module
           will be called lm87.
diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index 28cdff0c556b..3ab4c3f0efdd 100644
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -5,7 +5,7 @@
  *                          Philip Edelbrock <phil@netroedge.com>
  *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
  *                          Dan Eaton <dan.eaton@rocketlogix.com>
- * Copyright (C) 2004       Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2004,2007  Jean Delvare <khali@linux-fr.org>
  *
  * Original port to Linux 2.6 by Jeff Oliver.
  *
@@ -37,6 +37,11 @@
  * instead. The LM87 is the only hardware monitoring chipset I know of
  * which uses amplitude modulation. Be careful when using this feature.
  *
+ * This driver also supports the ADM1024, a sensor chip made by Analog
+ * Devices. That chip is fully compatible with the LM87. Complete
+ * datasheet can be obtained from Analog's website at:
+ *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -74,7 +79,7 @@ static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  * Insmod parameters
  */
 
-I2C_CLIENT_INSMOD_1(lm87);
+I2C_CLIENT_INSMOD_2(lm87, adm1024);
 
 /*
  * The LM87 registers
@@ -662,6 +667,7 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
         struct i2c_client *new_client;
         struct lm87_data *data;
         int err = 0;
+        static const char *names[] = { "lm87", "adm1024" };
 
         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                 goto exit;
@@ -686,11 +692,18 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
 
         /* Now, we do the remaining detection. */
         if (kind < 0) {
+                u8 cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
                 u8 rev = lm87_read_value(new_client, LM87_REG_REVISION);
 
-                if (rev < 0x01 || rev > 0x08
-                 || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
-                 || lm87_read_value(new_client, LM87_REG_COMPANY_ID) != 0x02) {
+                if (cid == 0x02                 /* National Semiconductor */
+                 && (rev >= 0x01 && rev <= 0x08))
+                        kind = lm87;
+                else if (cid == 0x41            /* Analog Devices */
+                      && (rev & 0xf0) == 0x10)
+                        kind = adm1024;
+
+                if (kind < 0
+                 || (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)) {
                         dev_dbg(&adapter->dev,
                                 "LM87 detection failed at 0x%02x.\n",
                                 address);
@@ -699,7 +712,7 @@ static int lm87_detect(struct i2c_adapter *adapter, int address, int kind)
         }
 
         /* We can fill in the remaining client fields */
-        strlcpy(new_client->name, "lm87", I2C_NAME_SIZE);
+        strlcpy(new_client->name, names[kind - 1], I2C_NAME_SIZE);
         data->valid = 0;
         mutex_init(&data->update_lock);