[PATCH platform-next v2 05/11] 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>
---
v1->v2:
Comments pointed out by Andy:
- Add string_upper(), string_lower() helpers. Use string_upper() for
  label conversion.
- Simplify code for event string construction.
---
 drivers/platform/mellanox/mlxreg-hotplug.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c 
b/drivers/platform/mellanox/mlxreg-hotplug.c
index d9863e7fd491..b013445147dd 100644
--- a/drivers/platform/mellanox/mlxreg-hotplug.c
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -16,6 +16,7 @@
 #include <linux/platform_data/mlxreg.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
+#include <linux/string_helpers.h>
 #include <linux/regmap.h>
 #include <linux/workqueue.h>
 
@@ -71,6 +72,23 @@ 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 };
+
+       mlxreg_hotplug_udev_envp[0] = event_str;
+       string_upper(label, data->label);
+       snprintf(event_str, MLXREG_CORE_LABEL_MAX_SIZE, "%s=%d", label, 
!!action);
+
+       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)
 {
@@ -78,7 +96,7 @@ static int mlxreg_hotplug_device_create(struct 
mlxreg_hotplug_priv_data *priv,
        struct i2c_client *client;
 
        /* 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
@@ -118,7 +136,7 @@ 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