diff options
Diffstat (limited to 'drivers/hwmon/pmbus/pmbus_core.c')
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 8470097907bc..2c196eddbb8d 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -1088,6 +1088,9 @@ static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data, snprintf(sensor->name, sizeof(sensor->name), "%s%d", name, seq); + if (data->flags & PMBUS_WRITE_PROTECTED) + readonly = true; + sensor->page = page; sensor->reg = reg; sensor->class = class; @@ -2141,6 +2144,15 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data, if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK)) client->flags |= I2C_CLIENT_PEC; + /* + * Check if the chip is write protected. If it is, we can not clear + * faults, and we should not try it. Also, in that case, writes into + * limit registers need to be disabled. + */ + ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT); + if (ret > 0 && (ret & PB_WP_ANY)) + data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK; + if (data->info->pages) pmbus_clear_faults(client); else |