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authorGuenter Roeck <guenter.roeck@ericsson.com>2011-07-05 13:31:48 -0700
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-07-28 00:17:35 -0700
commit8c1d04192e2ef1e6d38e9d5e9c500e5330d20339 (patch)
tree06bd055abad6db6660f7a52bc03a6086a8f15391 /drivers/hwmon
parentfffd80ccc1e6c7e5f13741e17a7d80582ae21fcc (diff)
downloadlinux-8c1d04192e2ef1e6d38e9d5e9c500e5330d20339.tar.bz2
hwmon: (lm95241) Add support for LM95231
LM95231 is fully compatible to LM95241; only necessary change is to add chip detection. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Acked-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig5
-rw-r--r--drivers/hwmon/lm95241.c31
2 files changed, 22 insertions, 14 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 166889b326ff..38c2adba8381 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -694,10 +694,11 @@ config SENSORS_LTC4261
be called ltc4261.
config SENSORS_LM95241
- tristate "National Semiconductor LM95241 sensor chip"
+ tristate "National Semiconductor LM95241 and compatibles"
depends on I2C
help
- If you say yes here you get support for LM95241 sensor chip.
+ If you say yes here you get support for LM95231 and LM95241 sensor
+ chips.
This driver can also be built as a module. If so, the module
will be called lm95241.
diff --git a/drivers/hwmon/lm95241.c b/drivers/hwmon/lm95241.c
index d3b464b74ced..513901d592a9 100644
--- a/drivers/hwmon/lm95241.c
+++ b/drivers/hwmon/lm95241.c
@@ -74,8 +74,9 @@ static const unsigned short normal_i2c[] = {
#define TT_OFF 0
#define TT_ON 1
#define TT_MASK 7
-#define MANUFACTURER_ID 0x01
-#define DEFAULT_REVISION 0xA4
+#define NATSEMI_MAN_ID 0x01
+#define LM95231_CHIP_ID 0xA1
+#define LM95241_CHIP_ID 0xA4
static const u8 lm95241_reg_address[] = {
LM95241_REG_R_LOCAL_TEMPH,
@@ -338,20 +339,25 @@ static int lm95241_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
- int address = new_client->addr;
const char *name;
+ int mfg_id, chip_id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
- if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
- == MANUFACTURER_ID)
- && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
- == DEFAULT_REVISION)) {
- name = DEVNAME;
- } else {
- dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n",
- address);
+ mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
+ if (mfg_id != NATSEMI_MAN_ID)
+ return -ENODEV;
+
+ chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
+ switch (chip_id) {
+ case LM95231_CHIP_ID:
+ name = "lm95231";
+ break;
+ case LM95241_CHIP_ID:
+ name = "lm95241";
+ break;
+ default:
return -ENODEV;
}
@@ -431,7 +437,8 @@ static int lm95241_remove(struct i2c_client *client)
/* Driver data (common to all clients) */
static const struct i2c_device_id lm95241_id[] = {
- { DEVNAME, 0 },
+ { "lm95231", 0 },
+ { "lm95241", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm95241_id);