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authorGuenter Roeck <linux@roeck-us.net>2015-08-17 16:26:21 -0700
committerGuenter Roeck <linux@roeck-us.net>2015-08-19 09:08:29 -0700
commitd830e27dac26b4f084c5ed2282666527f90db0ed (patch)
treeb27b123577dcef97da43c4c047183172792ea37c /drivers/hwmon/pmbus
parent2c052d4280ca48fddc7a9ffd2329ada3628cab86 (diff)
downloadlinux-d830e27dac26b4f084c5ed2282666527f90db0ed.tar.bz2
hwmon: (pmbus) Enable PEC if the controller supports it
PMBus controllers optionally support PEC. Configure the driver to use it if available to improve operational security. Suggested-by: Michael Jones <mike@proclivis.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/pmbus')
-rw-r--r--drivers/hwmon/pmbus/pmbus_core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 398198140b81..ba59eaef2e07 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -1751,6 +1751,11 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
}
}
+ /* Enable PEC if the controller supports it */
+ ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
+ if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK))
+ client->flags |= I2C_CLIENT_PEC;
+
pmbus_clear_faults(client);
if (info->identify) {