[HWMON] Add LM82 support

Add LM82 thermal detector support (similar to the LM83, but less featureful).

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
---

 drivers/hwmon/lm83.c |   63 +++++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 49 insertions(+), 14 deletions(-)

diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c
index 26dfa9e..aa8b74d 100644
--- a/drivers/hwmon/lm83.c
+++ b/drivers/hwmon/lm83.c
@@ -12,6 +12,11 @@
  * Since the datasheet omits to give the chip stepping code, I give it
  * here: 0x03 (at register 0xff).
  *
+ * <jordan.crouse@amd.com>: Added LM82 support
+ * http://www.national.com/pf/LM/LM82.html - basically a stripped down
+ * model of the LM83, with only two temperatures reported.  The stepping
+ * is 0x01 (at least according to the datasheet).
+ *
  * 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
@@ -51,7 +56,7 @@ static unsigned short normal_i2c[] = { 0
  * Insmod parameters
  */
 
-I2C_CLIENT_INSMOD_1(lm83);
+I2C_CLIENT_INSMOD_2(lm83, lm82);
 
 /*
  * The LM83 registers
@@ -142,6 +147,7 @@ struct lm83_data {
 	struct semaphore update_lock;
 	char valid; /* zero until following fields are valid */
 	unsigned long last_updated; /* in jiffies */
+	int type;  /* Remember the type of chip */
 
 	/* registers values */
 	s8 temp[9];	/* 0..3: input 1-4,
@@ -159,7 +165,14 @@ static ssize_t show_temp(struct device *
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct lm83_data *data = lm83_update_device(dev);
-	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
+	int index = attr->index;
+
+	if (data->type == lm82) {
+		if (index == 1 || index == 5)
+			index++;
+	}
+
+	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 }
 
 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
@@ -172,6 +185,12 @@ static ssize_t set_temp(struct device *d
 	int nr = attr->index;
 
 	down(&data->update_lock);
+
+	if (data->type == lm82) {
+		if (nr == 1 || nr == 5)
+			nr++;
+	}
+
 	data->temp[nr] = TEMP_TO_REG(val);
 	i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
 				  data->temp[nr]);
@@ -283,6 +302,9 @@ static int lm83_detect(struct i2c_adapte
 			if (chip_id == 0x03) {
 				kind = lm83;
 			}
+			else if (chip_id == 0x01) {
+				kind = lm82;
+			}
 		}
 
 		if (kind <= 0) { /* identification failed */
@@ -296,10 +318,15 @@ static int lm83_detect(struct i2c_adapte
 	if (kind == lm83) {
 		name = "lm83";
 	}
+	else if (kind = lm82) {
+		name = "lm82";
+	}
 
 	/* We can fill in the remaining client fields */
 	strlcpy(new_client->name, name, I2C_NAME_SIZE);
 	data->valid = 0;
+	data->type = kind;
+
 	init_MUTEX(&data->update_lock);
 
 	/* Tell the I2C layer a new client has arrived */
@@ -322,28 +349,36 @@ static int lm83_detect(struct i2c_adapte
 			   &sensor_dev_attr_temp1_input.dev_attr);
 	device_create_file(&new_client->dev,
 			   &sensor_dev_attr_temp2_input.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp3_input.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp4_input.dev_attr);
+
 	device_create_file(&new_client->dev,
 			   &sensor_dev_attr_temp1_max.dev_attr);
 	device_create_file(&new_client->dev,
 			   &sensor_dev_attr_temp2_max.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp3_max.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp4_max.dev_attr);
+
 	device_create_file(&new_client->dev,
 			   &sensor_dev_attr_temp1_crit.dev_attr);
 	device_create_file(&new_client->dev,
 			   &sensor_dev_attr_temp2_crit.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp3_crit.dev_attr);
-	device_create_file(&new_client->dev,
-			   &sensor_dev_attr_temp4_crit.dev_attr);
+
 	device_create_file(&new_client->dev, &dev_attr_alarms);
 
+	if (kind == lm83) {
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp3_input.dev_attr);
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp4_input.dev_attr);
+
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp3_max.dev_attr);
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp4_max.dev_attr);
+
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp3_crit.dev_attr);
+		device_create_file(&new_client->dev,
+				   &sensor_dev_attr_temp4_crit.dev_attr);
+	}
+
 	return 0;
 
 exit_detach: