diff options
Diffstat (limited to 'drivers/hwmon/adm1021.c')
| -rw-r--r-- | drivers/hwmon/adm1021.c | 90 |
1 files changed, 75 insertions, 15 deletions
diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c index 7e76922a4ba9..29dd9f746dfa 100644 --- a/drivers/hwmon/adm1021.c +++ b/drivers/hwmon/adm1021.c @@ -284,15 +284,11 @@ static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); static struct attribute *adm1021_attributes[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, - &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, - &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &dev_attr_alarms.attr, &dev_attr_low_power.attr, @@ -303,6 +299,18 @@ static const struct attribute_group adm1021_group = { .attrs = adm1021_attributes, }; +static struct attribute *adm1021_min_attributes[] = { + &sensor_dev_attr_temp1_min.dev_attr.attr, + &sensor_dev_attr_temp2_min.dev_attr.attr, + &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, + &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, + NULL +}; + +static const struct attribute_group adm1021_min_group = { + .attrs = adm1021_min_attributes, +}; + /* Return 0 if detection is successful, -ENODEV otherwise */ static int adm1021_detect(struct i2c_client *client, struct i2c_board_info *info) @@ -331,26 +339,68 @@ static int adm1021_detect(struct i2c_client *client, man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID); dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID); + if (man_id < 0 || dev_id < 0) + return -ENODEV; + if (man_id == 0x4d && dev_id == 0x01) type_name = "max1617a"; else if (man_id == 0x41) { if ((dev_id & 0xF0) == 0x30) type_name = "adm1023"; - else + else if ((dev_id & 0xF0) == 0x00) type_name = "adm1021"; + else + return -ENODEV; } else if (man_id == 0x49) type_name = "thmc10"; else if (man_id == 0x23) type_name = "gl523sm"; else if (man_id == 0x54) type_name = "mc1066"; - /* LM84 Mfr ID in a different place, and it has more unused bits */ - else if (conv_rate == 0x00 - && (config & 0x7F) == 0x00 - && (status & 0xAB) == 0x00) - type_name = "lm84"; - else - type_name = "max1617"; + else { + int lte, rte, lhi, rhi, llo, rlo; + + /* extra checks for LM84 and MAX1617 to avoid misdetections */ + + llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0)); + rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1)); + + /* fail if any of the additional register reads failed */ + if (llo < 0 || rlo < 0) + return -ENODEV; + + lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0)); + rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1)); + lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0)); + rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1)); + + /* + * Fail for negative temperatures and negative high limits. + * This check also catches read errors on the tested registers. + */ + if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0) + return -ENODEV; + + /* fail if all registers hold the same value */ + if (lte == rte && lte == lhi && lte == rhi && lte == llo + && lte == rlo) + return -ENODEV; + + /* + * LM84 Mfr ID is in a different place, + * and it has more unused bits. + */ + if (conv_rate == 0x00 + && (config & 0x7F) == 0x00 + && (status & 0xAB) == 0x00) { + type_name = "lm84"; + } else { + /* fail if low limits are larger than high limits */ + if ((s8)llo > lhi || (s8)rlo > rhi) + return -ENODEV; + type_name = "max1617"; + } + } pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n", type_name, i2c_adapter_id(adapter), client->addr); @@ -383,6 +433,12 @@ static int adm1021_probe(struct i2c_client *client, if (err) return err; + if (data->type != lm84) { + err = sysfs_create_group(&client->dev.kobj, &adm1021_min_group); + if (err) + goto error; + } + data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); @@ -392,6 +448,7 @@ static int adm1021_probe(struct i2c_client *client, return 0; error: + sysfs_remove_group(&client->dev.kobj, &adm1021_min_group); sysfs_remove_group(&client->dev.kobj, &adm1021_group); return err; } @@ -410,6 +467,7 @@ static int adm1021_remove(struct i2c_client *client) struct adm1021_data *data = i2c_get_clientdata(client); hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &adm1021_min_group); sysfs_remove_group(&client->dev.kobj, &adm1021_group); return 0; @@ -435,9 +493,11 @@ static struct adm1021_data *adm1021_update_device(struct device *dev) data->temp_max[i] = 1000 * (s8) i2c_smbus_read_byte_data( client, ADM1021_REG_TOS_R(i)); - data->temp_min[i] = 1000 * - (s8) i2c_smbus_read_byte_data( - client, ADM1021_REG_THYST_R(i)); + if (data->type != lm84) { + data->temp_min[i] = 1000 * + (s8) i2c_smbus_read_byte_data(client, + ADM1021_REG_THYST_R(i)); + } } data->alarms = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS) & 0x7c; |