From 9a72f564dec662c816a2065c4555ca38f10d5aae Mon Sep 17 00:00:00 2001
From: Bin Yang <yangbin@rock-chips.com>
Date: Thu, 9 Feb 2017 18:15:30 +0800
Subject: [PATCH] drm: bridge/dw_hdmi: add switch state to support hdmi audio

Change-Id: Ib8122f9cc913d2cd15b92a3d6c57c7edf77d0483
Signed-off-by: Bin Yang <yangbin@rock-chips.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 03ae15e1d989..f784f8098114 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -30,6 +30,9 @@
 #include <drm/drm_encoder_slave.h>
 #include <drm/drm_scdc_helper.h>
 #include <drm/bridge/dw_hdmi.h>
+#ifdef CONFIG_SWITCH
+#include <linux/switch.h>
+#endif
 
 #include <uapi/linux/media-bus-format.h>
 #include <uapi/linux/videodev2.h>
@@ -240,6 +243,10 @@ struct dw_hdmi {
 	unsigned int audio_n;
 	bool audio_enable;
 
+#ifdef CONFIG_SWITCH
+	struct switch_dev switchdev;
+#endif
+
 	unsigned int reg_shift;
 	struct regmap *regm;
 	void (*enable_audio)(struct dw_hdmi *hdmi);
@@ -2511,6 +2518,12 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 			phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
 		if (hdmi->bridge.dev)
 			drm_helper_hpd_irq_event(hdmi->bridge.dev);
+#ifdef CONFIG_SWITCH
+		if (phy_int_pol & HDMI_PHY_HPD)
+			switch_set_state(&hdmi->switchdev, 1);
+		else
+			switch_set_state(&hdmi->switchdev, 0);
+#endif
 	}
 
 	hdmi_writeb(hdmi, intr_stat, HDMI_IH_PHY_STAT0);
@@ -3046,6 +3059,11 @@ __dw_hdmi_probe(struct platform_device *pdev,
 		hdmi->cec = platform_device_register_full(&pdevinfo);
 	}
 
+#ifdef CONFIG_SWITCH
+	hdmi->switchdev.name = "hdmi";
+	switch_dev_register(&hdmi->switchdev);
+#endif
+
 	/* Reset HDMI DDC I2C master controller and mute I2CM interrupts */
 	if (hdmi->i2c)
 		dw_hdmi_i2c_init(hdmi);
@@ -3084,6 +3102,10 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
 	/* Disable all interrupts */
 	hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0);
 
+#ifdef CONFIG_SWITCH
+	switch_dev_unregister(&hdmi->switchdev);
+#endif
+
 	dw_hdmi_destroy_properties(hdmi);
 
 	if (hdmi->cec_notifier)