diff options
Diffstat (limited to 'drivers/hwmon/lm90.c')
| -rw-r--r-- | drivers/hwmon/lm90.c | 72 |
1 files changed, 56 insertions, 16 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 24b3b0e97537..5771130f51ff 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -43,6 +43,13 @@ * variants. The extra address and features of the MAX6659 are not * supported by this driver. * + * This driver also supports the MAX6680 and MAX6681, two other sensor + * chips made by Maxim. These are quite similar to the other Maxim + * chips. Complete datasheet can be obtained at: + * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370 + * The MAX6680 and MAX6681 only differ in the pinout so they can be + * treated identically. + * * This driver also supports the ADT7461 chip from Analog Devices but * only in its "compatability mode". If an ADT7461 chip is found but * is configured in non-compatible mode (where its temperature @@ -84,20 +91,25 @@ /* * Addresses to scan * Address is fully defined internally and cannot be changed except for - * MAX6659. + * MAX6659, MAX6680 and MAX6681. * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658 * have address 0x4c. * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d. * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). + * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, + * 0x4c, 0x4d or 0x4e. */ -static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END }; +static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, + 0x29, 0x2a, 0x2b, + 0x4c, 0x4d, 0x4e, + I2C_CLIENT_END }; /* * Insmod parameters */ -I2C_CLIENT_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461); +I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680); /* * The LM90 registers @@ -525,7 +537,8 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) ®_convrate) < 0) goto exit_free; - if (man_id == 0x01) { /* National Semiconductor */ + if ((address == 0x4C || address == 0x4D) + && man_id == 0x01) { /* National Semiconductor */ u8 reg_config2; if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2, @@ -548,7 +561,8 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) } } } else - if (man_id == 0x41) { /* Analog Devices */ + if ((address == 0x4C || address == 0x4D) + && man_id == 0x41) { /* Analog Devices */ if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ && (reg_config1 & 0x3F) == 0x00 && reg_convrate <= 0x0A) { @@ -562,18 +576,30 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) } else if (man_id == 0x4D) { /* Maxim */ /* - * The Maxim variants do NOT have a chip_id register. - * Reading from that address will return the last read - * value, which in our case is those of the man_id - * register. Likewise, the config1 register seems to - * lack a low nibble, so the value will be those of the - * previous read, so in our case those of the man_id - * register. + * The MAX6657, MAX6658 and MAX6659 do NOT have a + * chip_id register. Reading from that address will + * return the last read value, which in our case is + * those of the man_id register. Likewise, the config1 + * register seems to lack a low nibble, so the value + * will be those of the previous read, so in our case + * those of the man_id register. */ if (chip_id == man_id + && (address == 0x4F || address == 0x4D) && (reg_config1 & 0x1F) == (man_id & 0x0F) && reg_convrate <= 0x09) { kind = max6657; + } else + /* The chip_id register of the MAX6680 and MAX6681 + * holds the revision of the chip. + * the lowest bit of the config1 register is unused + * and should return zero when read, so should the + * second to last bit of config1 (software reset) + */ + if (chip_id == 0x01 + && (reg_config1 & 0x03) == 0x00 + && reg_convrate <= 0x07) { + kind = max6680; } } @@ -599,6 +625,8 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) name = "lm86"; } else if (kind == max6657) { name = "max6657"; + } else if (kind == max6680) { + name = "max6680"; } else if (kind == adt7461) { name = "adt7461"; } @@ -646,7 +674,8 @@ exit: static void lm90_init_client(struct i2c_client *client) { - u8 config; + u8 config, config_orig; + struct lm90_data *data = i2c_get_clientdata(client); /* * Start the conversions. @@ -657,9 +686,20 @@ static void lm90_init_client(struct i2c_client *client) dev_warn(&client->dev, "Initialization failed!\n"); return; } - if (config & 0x40) - i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, - config & 0xBF); /* run */ + config_orig = config; + + /* + * Put MAX6680/MAX8881 into extended resolution (bit 0x10, + * 0.125 degree resolution) and range (0x08, extend range + * to -64 degree) mode for the remote temperature sensor. + */ + if (data->kind == max6680) { + config |= 0x18; + } + + config &= 0xBF; /* run */ + if (config != config_orig) /* Only write if changed */ + i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); } static int lm90_detach_client(struct i2c_client *client) |