tegra_udrm: add SEND_CONNECTOR_STATUS_EVENT ioctl

Add DRM_TEGRA_UDRM_SEND_CONNECTOR_STATUS_EVENT ioctl to generate
a uevent for connector status property change. user space calls
this ioctl with connector id and  property id related to the
status change.

Bug 200577678

Change-Id: I079a7ebbc2c11ad6e6c7003df6eab57817161e26
Signed-off-by: Yogish Kulkarni <yogishk@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2266101
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sai Kiran K <skirank@nvidia.com>
Tested-by: Sai Kiran K <skirank@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 38 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tegra_udrm/tegra_udrm_drv.c b/drivers/gpu/drm/tegra_udrm/tegra_udrm_drv.c
index 28effb97c..18e61df6a 100644
--- a/drivers/gpu/drm/tegra_udrm/tegra_udrm_drv.c
+++ b/drivers/gpu/drm/tegra_udrm/tegra_udrm_drv.c
@@ -334,6 +334,25 @@ static int tegra_udrm_send_vblank_event_ioctl(struct drm_device *drm,
         return 0;
 }
 
+static int tegra_udrm_send_connector_status_event_ioctl(struct drm_device *drm,
+                void *data, struct drm_file *file)
+{
+        struct drm_tegra_udrm_connector_status_event *args =
+                (struct drm_tegra_udrm_connector_status_event *)data;
+        char hotplug_str[] = "HOTPLUG=1", conn_id[30], prop_id[30];
+        char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
+        int ret = 0;
+
+        snprintf(conn_id, ARRAY_SIZE(conn_id), "CONNECTOR=%u", args->conn_id);
+        snprintf(prop_id, ARRAY_SIZE(prop_id), "PROPERTY=%u", args->prop_id);
+
+        ret = kobject_uevent_env(&drm->primary->kdev->kobj, KOBJ_CHANGE, envp);
+        if (ret < 0)
+                pr_err("%s: kobj_uevent error!\n", __func__);
+
+        return ret;
+}
+
 static const struct file_operations tegra_udrm_fops = {
         .owner = THIS_MODULE,
         .open = drm_open,
@@ -376,6 +395,8 @@ static const struct drm_ioctl_desc tegra_udrm_ioctls[] = {
                 tegra_udrm_drop_master_notify_ioctl, 0),
         DRM_IOCTL_DEF_DRV(TEGRA_UDRM_SET_MASTER_NOTIFY,
                 tegra_udrm_set_master_notify_ioctl, 0),
+        DRM_IOCTL_DEF_DRV(TEGRA_UDRM_SEND_CONNECTOR_STATUS_EVENT,
+                tegra_udrm_send_connector_status_event_ioctl, 0),
 };
 
 static int tegra_udrm_open(struct drm_device *drm, struct drm_file *filp)
diff --git a/include/uapi/drm/tegra_udrm.h b/include/uapi/drm/tegra_udrm.h
index 9ef02ffb7..2930bdfed 100644
--- a/include/uapi/drm/tegra_udrm.h
+++ b/include/uapi/drm/tegra_udrm.h
@@ -29,6 +29,7 @@ extern "C" {
 #define DRM_TEGRA_UDRM_SEND_VBLANK_EVENT        0x03
 #define DRM_TEGRA_UDRM_DROP_MASTER_NOTIFY       0x04
 #define DRM_TEGRA_UDRM_SET_MASTER_NOTIFY        0x05
+#define DRM_TEGRA_UDRM_SEND_CONNECTOR_STATUS_EVENT 0x06
 
 struct drm_tegra_udrm_dmabuf_mmap {
         int fd;
@@ -58,6 +59,11 @@ struct drm_tegra_udrm_set_master_notify {
         int clear;
 };
 
+struct drm_tegra_udrm_connector_status_event {
+        uint32_t conn_id;
+        uint32_t prop_id;
+};
+
 #define TEGRA_UDRM_IOCTL(dir, name, str) \
         DRM_##dir(DRM_COMMAND_BASE + DRM_TEGRA_UDRM_##name, \
                 struct drm_tegra_udrm_##str)
@@ -121,6 +127,17 @@ struct drm_tegra_udrm_set_master_notify {
 #define DRM_IOCTL_TEGRA_UDRM_SET_MASTER_NOTIFY \
         TEGRA_UDRM_IOCTL(IOW, SET_MASTER_NOTIFY, set_master_notify)
 
+/* UMD issues this ioctl to generate a uevent for connector status
+ * property change.
+ *
+ * In parameters -
+ *    conn_id: connector id related to the status change.
+ *    prop_id: property id related to the status change.
+ */
+#define DRM_IOCTL_TEGRA_UDRM_SEND_CONNECTOR_STATUS_EVENT \
+        TEGRA_UDRM_IOCTL(IOW, SEND_CONNECTOR_STATUS_EVENT, \
+                connector_status_event)
+
 #if defined(__cplusplus)
 }
 #endif