diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lm92.c | 58 |
1 files changed, 0 insertions, 58 deletions
diff --git a/drivers/hwmon/lm92.c b/drivers/hwmon/lm92.c index 2a91974a10bb..18509b5af11e 100644 --- a/drivers/hwmon/lm92.c +++ b/drivers/hwmon/lm92.c @@ -259,62 +259,6 @@ static void lm92_init_client(struct i2c_client *client) config & 0xFE); } -/* - * The MAX6635 has no identification register, so we have to use tricks - * to identify it reliably. This is somewhat slow. - * Note that we do NOT rely on the 2 MSB of the configuration register - * always reading 0, as suggested by the datasheet, because it was once - * reported not to be true. - */ -static int max6635_check(struct i2c_client *client) -{ - u16 temp_low, temp_high, temp_hyst, temp_crit; - u8 conf; - int i; - - /* - * No manufacturer ID register, so a read from this address will - * always return the last read value. - */ - temp_low = i2c_smbus_read_word_data(client, LM92_REG_TEMP_LOW); - if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_low) - return 0; - temp_high = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HIGH); - if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_high) - return 0; - - /* Limits are stored as integer values (signed, 9-bit). */ - if ((temp_low & 0x7f00) || (temp_high & 0x7f00)) - return 0; - temp_hyst = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HYST); - temp_crit = i2c_smbus_read_word_data(client, LM92_REG_TEMP_CRIT); - if ((temp_hyst & 0x7f00) || (temp_crit & 0x7f00)) - return 0; - - /* - * Registers addresses were found to cycle over 16-byte boundaries. - * We don't test all registers with all offsets so as to save some - * reads and time, but this should still be sufficient to dismiss - * non-MAX6635 chips. - */ - conf = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG); - for (i = 16; i < 96; i *= 2) { - if (temp_hyst != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HYST + i - 16) - || temp_crit != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_CRIT + i) - || temp_low != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_LOW + i + 16) - || temp_high != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HIGH + i + 32) - || conf != i2c_smbus_read_byte_data(client, - LM92_REG_CONFIG + i)) - return 0; - } - - return 1; -} - static struct attribute *lm92_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_crit.dev_attr.attr, @@ -348,8 +292,6 @@ static int lm92_detect(struct i2c_client *new_client, if ((config & 0xe0) == 0x00 && man_id == 0x0180) pr_info("lm92: Found National Semiconductor LM92 chip\n"); - else if (max6635_check(new_client)) - pr_info("lm92: Found Maxim MAX6635 chip\n"); else return -ENODEV; |