gpu: drm: nexell: Add extcon notification for hdmi connection

Currently, HDMI cable connection generates only uevent by drm core. In
addition, it has no inforation about connection state. But, in tizen,
to handle TV-out mode uevent should be generated by extcon subsystem
with connection state. To this end, this patch will add extcon
notification for hdmi connection.

Change-Id: I101bf3b582498fbe46733839e3cbd75c292cf88f
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

diff --git a/drivers/gpu/drm/nexell/Kconfig b/drivers/gpu/drm/nexell/Kconfig
index 8b841d13aa54846e26488d3ed6a11af2843a5907..eedcb129f605d1c68d578862927649d0b0629542 100644 (file)
--- a/drivers/gpu/drm/nexell/Kconfig
+++ b/drivers/gpu/drm/nexell/Kconfig
@@ -58,6 +58,7 @@ config DRM_NX_MIPI_DSI
 config DRM_NX_HDMI
        bool "HDMI support"
        depends on DRM_NX
+       select EXTCON
        help
         This selects support for HDMI display out.
         If you want to enable HDMI display,

diff --git a/drivers/gpu/drm/nexell/nx_drm_hdmi.c b/drivers/gpu/drm/nexell/nx_drm_hdmi.c
index d5ebffd9b8598b33c15a0d261539957043e9fd74..4de04355125e05708c327735f4ee3282474856cd 100644 (file)
--- a/drivers/gpu/drm/nexell/nx_drm_hdmi.c
+++ b/drivers/gpu/drm/nexell/nx_drm_hdmi.c
@@ -29,6 +29,7 @@
 #include <video/of_display_timing.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <drm/nexell_drm.h>
+#include <linux/extcon.h>
 
 #include "nx_drm_drv.h"
 #include "nx_drm_fb.h"
@@ -51,6 +52,12 @@ struct hdmi_context {
        /* properties */
        int crtc_pipe;
        unsigned int possible_crtcs_mask;
+       struct extcon_dev *edev;
+};
+
+static const unsigned int supported_cable[] = {
+       EXTCON_DISP_HDMI,
+       EXTCON_NONE,
 };
 
 #define ctx_to_display(c)      \
@@ -367,6 +374,8 @@ static void panel_hdmi_hpd_work(struct work_struct *work)
 
        DRM_INFO("HDMI %s\n", plug ? "plug" : "unplug");
 
+       extcon_set_cable_state_(ctx->edev, EXTCON_DISP_HDMI, plug);
+
        ctx->plug = plug;
        connector = &ctx->connector->connector;
        drm_helper_hpd_irq_event(connector->dev);
@@ -557,6 +566,40 @@ static int panel_hdmi_get_display(struct platform_device *pdev,
        return 0;
 }
 
+static int panel_hdmi_extcon_init(struct platform_device *pdev,
+                                       struct hdmi_context *ctx)
+{
+       struct device *dev = &pdev->dev;
+       struct nx_drm_display *display = ctx_to_display(ctx);
+       struct extcon_dev *edev;
+       int err;
+
+       edev = devm_extcon_dev_allocate(dev, supported_cable);
+       if (IS_ERR(edev)) {
+               DRM_ERROR("failed to allocate extcon device\n");
+               return -ENODEV;
+       }
+
+       err = devm_extcon_dev_register(dev, edev);
+       if (err) {
+               DRM_ERROR("failed to register extcon device\n");
+               return err;
+       }
+
+       if (!display->ops->hdmi->is_connected) {
+               DRM_ERROR("HDMI not implement connected API\n");
+               return -ENOENT;
+       }
+
+       ctx->edev = edev;
+
+       /* notify the plugged state when hdmi is already connected */
+       if (display->ops->hdmi->is_connected(display))
+               extcon_set_cable_state_(edev, EXTCON_DISP_HDMI, true);
+
+       return 0;
+}
+
 static int panel_hdmi_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -593,6 +636,10 @@ static int panel_hdmi_probe(struct platform_device *pdev)
        if (err < 0)
                goto err_probe;
 
+       err = panel_hdmi_extcon_init(pdev, ctx);
+       if (0 > err)
+               return err;
+
        dev_set_drvdata(dev, ctx);
 
        component_add(dev, &panel_comp_ops);