diff options
| -rw-r--r-- | Documentation/hwmon/tmp421 | 4 | ||||
| -rw-r--r-- | drivers/hwmon/tmp421.c | 14 |
2 files changed, 16 insertions, 2 deletions
diff --git a/Documentation/hwmon/tmp421 b/Documentation/hwmon/tmp421 index 0cf07f82474..d0e77143077 100644 --- a/Documentation/hwmon/tmp421 +++ b/Documentation/hwmon/tmp421 @@ -8,11 +8,11 @@ Supported chips: Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html * Texas Instruments TMP422 Prefix: 'tmp422' - Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f + Addresses scanned: I2C 0x4c, 0x4d, 0x4e and 0x4f Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html * Texas Instruments TMP423 Prefix: 'tmp423' - Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f + Addresses scanned: I2C 0x4c and 0x4d Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html Authors: diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c index 7bab7a9bedc..9438c1bd5d5 100644 --- a/drivers/hwmon/tmp421.c +++ b/drivers/hwmon/tmp421.c @@ -42,6 +42,7 @@ static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f, enum chips { tmp421, tmp422, tmp423 }; /* The TMP421 registers */ +#define TMP421_STATUS_REG 0x08 #define TMP421_CONFIG_REG_1 0x09 #define TMP421_CONVERSION_RATE_REG 0x0B #define TMP421_MANUFACTURER_ID_REG 0xFE @@ -235,6 +236,7 @@ static int tmp421_detect(struct i2c_client *client, enum chips kind; struct i2c_adapter *adapter = client->adapter; const char *names[] = { "TMP421", "TMP422", "TMP423" }; + int addr = client->addr; u8 reg; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) @@ -244,15 +246,27 @@ static int tmp421_detect(struct i2c_client *client, if (reg != TMP421_MANUFACTURER_ID) return -ENODEV; + reg = i2c_smbus_read_byte_data(client, TMP421_CONVERSION_RATE_REG); + if (reg & 0xf8) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, TMP421_STATUS_REG); + if (reg & 0x7f) + return -ENODEV; + reg = i2c_smbus_read_byte_data(client, TMP421_DEVICE_ID_REG); switch (reg) { case TMP421_DEVICE_ID: kind = tmp421; break; case TMP422_DEVICE_ID: + if (addr == 0x2a) + return -ENODEV; kind = tmp422; break; case TMP423_DEVICE_ID: + if (addr != 0x4c && addr != 0x4d) + return -ENODEV; kind = tmp423; break; default: |