[PATCH platform-next v1 2/8] platform/mellanox: mlxreg-hotplug: Add environmental data to uevent

[Vadim Pasternak]

Send "udev" event with environmental data in order to allow handling
"ENV{}" variables in "udev" rules.

Signed-off-by: Vadim Pasternak <vad...@mellanox.com>
---
 drivers/platform/mellanox/mlxreg-hotplug.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c 
b/drivers/platform/mellanox/mlxreg-hotplug.c
index 832fcf282d45..5420d5bb0e6c 100644
--- a/drivers/platform/mellanox/mlxreg-hotplug.c
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -97,13 +97,36 @@ struct mlxreg_hotplug_priv_data {
        u8 not_asserted;
 };
 
+/* Environment variables array for udev. */
+static char *mlxreg_hotplug_udev_envp[] = { NULL, NULL };
+
+static int
+mlxreg_hotplug_udev_event_send(struct kobject *kobj,
+                              struct mlxreg_core_data *data, bool action)
+{
+       char event_str[MLXREG_CORE_LABEL_MAX_SIZE + 2];
+       char label[MLXREG_CORE_LABEL_MAX_SIZE] = { 0 };
+       int i;
+
+       mlxreg_hotplug_udev_envp[0] = event_str;
+       for (i = 0; data->label[i]; i++)
+               label[i] = toupper(data->label[i]);
+
+       if (action)
+               snprintf(event_str, MLXREG_CORE_LABEL_MAX_SIZE, "%s=1", label);
+       else
+               snprintf(event_str, MLXREG_CORE_LABEL_MAX_SIZE, "%s=0", label);
+
+       return kobject_uevent_env(kobj, KOBJ_CHANGE, mlxreg_hotplug_udev_envp);
+}
+
 static int mlxreg_hotplug_device_create(struct mlxreg_hotplug_priv_data *priv,
                                        struct mlxreg_core_data *data)
 {
        struct mlxreg_core_hotplug_platform_data *pdata;
 
        /* Notify user by sending hwmon uevent. */
-       kobject_uevent(&priv->hwmon->kobj, KOBJ_CHANGE);
+       mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, true);
 
        /*
         * Return if adapter number is negative. It could be in case hotplug
@@ -141,7 +164,7 @@ mlxreg_hotplug_device_destroy(struct 
mlxreg_hotplug_priv_data *priv,
                              struct mlxreg_core_data *data)
 {
        /* Notify user by sending hwmon uevent. */
-       kobject_uevent(&priv->hwmon->kobj, KOBJ_CHANGE);
+       mlxreg_hotplug_udev_event_send(&priv->hwmon->kobj, data, false);
 
        if (data->hpdev.client) {
                i2c_unregister_device(data->hpdev.client);
-- 
2.11.0