[media] stih-cec: add CEC notifier support

By using the CEC notifier framework there is no longer any reason
to manually set the physical address. This was the one blocking
issue that prevented this driver from going out of staging, so do
this move as well.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

8 files changed, 47 insertions, 21 deletions

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index ab0bb48..e252b27 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -460,6 +460,24 @@ config VIDEO_TI_SC
 config VIDEO_TI_CSC
 	tristate
 
+menuconfig V4L_CEC_DRIVERS
+	bool "Platform HDMI CEC drivers"
+	depends on MEDIA_CEC_SUPPORT
+
+if V4L_CEC_DRIVERS
+
+config VIDEO_STI_HDMI_CEC
+       tristate "STMicroelectronics STiH4xx HDMI CEC driver"
+       depends on VIDEO_DEV && MEDIA_CEC_SUPPORT && (ARCH_STI || COMPILE_TEST)
+       select MEDIA_CEC_NOTIFIER
+       ---help---
+         This is a driver for STIH4xx HDMI CEC interface. It uses the
+         generic CEC framework interface.
+         CEC bus is present in the HDMI connector and enables communication
+         between compatible devices.
+
+endif #V4L_CEC_DRIVERS
+
 menuconfig V4L_TEST_DRIVERS
 	bool "Media test drivers"
 	depends on MEDIA_CAMERA_SUPPORT
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index c491731..057422c 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_VIDEO_SAMSUNG_EXYNOS_GSC)	+= exynos-gsc/
 obj-$(CONFIG_VIDEO_STI_BDISP)		+= sti/bdisp/
 obj-$(CONFIG_VIDEO_STI_HVA)		+= sti/hva/
 obj-$(CONFIG_DVB_C8SECTPFE)		+= sti/c8sectpfe/
+obj-$(CONFIG_VIDEO_STI_HDMI_CEC) 	+= sti/cec/
 
 obj-$(CONFIG_VIDEO_STI_DELTA)		+= sti/delta/
 
diff --git a/drivers/staging/media/st-cec/Makefile b/drivers/media/platform/sti/cec/Makefile
index f07905e..f07905e 100644
--- a/drivers/staging/media/st-cec/Makefile
+++ b/drivers/media/platform/sti/cec/Makefile
diff --git a/drivers/staging/media/st-cec/stih-cec.c b/drivers/media/platform/sti/cec/stih-cec.c
index 521206d..39ff551 100644
--- a/drivers/staging/media/st-cec/stih-cec.c
+++ b/drivers/media/platform/sti/cec/stih-cec.c
@@ -1,6 +1,4 @@
 /*
- * drivers/staging/media/st-cec/stih-cec.c
- *
  * STIH4xx CEC driver
  * Copyright (C) STMicroelectronic SA 2016
  *
@@ -15,9 +13,11 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 
 #include <media/cec.h>
+#include <media/cec-notifier.h>
 
 #define CEC_NAME	"stih-cec"
 
@@ -129,6 +129,7 @@ struct stih_cec {
 	void __iomem		*regs;
 	int			irq;
 	u32			irq_status;
+	struct cec_notifier	*notifier;
 };
 
 static int stih_cec_adap_enable(struct cec_adapter *adap, bool enable)
@@ -303,12 +304,29 @@ static int stih_cec_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct resource *res;
 	struct stih_cec *cec;
+	struct device_node *np;
+	struct platform_device *hdmi_dev;
 	int ret;
 
 	cec = devm_kzalloc(dev, sizeof(*cec), GFP_KERNEL);
 	if (!cec)
 		return -ENOMEM;
 
+	np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
+
+	if (!np) {
+		dev_err(&pdev->dev, "Failed to find hdmi node in device tree\n");
+		return -ENODEV;
+	}
+
+	hdmi_dev = of_find_device_by_node(np);
+	if (!hdmi_dev)
+		return -EPROBE_DEFER;
+
+	cec->notifier = cec_notifier_get(&hdmi_dev->dev);
+	if (!cec->notifier)
+		return -ENOMEM;
+
 	cec->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -335,7 +353,7 @@ static int stih_cec_probe(struct platform_device *pdev)
 	cec->adap = cec_allocate_adapter(&sti_cec_adap_ops, cec,
 			CEC_NAME,
 			CEC_CAP_LOG_ADDRS | CEC_CAP_PASSTHROUGH |
-			CEC_CAP_PHYS_ADDR | CEC_CAP_TRANSMIT, 1);
+			CEC_CAP_TRANSMIT, 1);
 	ret = PTR_ERR_OR_ZERO(cec->adap);
 	if (ret)
 		return ret;
@@ -346,12 +364,19 @@ static int stih_cec_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	cec_register_cec_notifier(cec->adap, cec->notifier);
+
 	platform_set_drvdata(pdev, cec);
 	return 0;
 }
 
 static int stih_cec_remove(struct platform_device *pdev)
 {
+	struct stih_cec *cec = platform_get_drvdata(pdev);
+
+	cec_unregister_adapter(cec->adap);
+	cec_notifier_put(cec->notifier);
+
 	return 0;
 }
 
diff --git a/drivers/staging/media/Kconfig b/drivers/staging/media/Kconfig
index abd0e2d..28088de 100644
--- a/drivers/staging/media/Kconfig
+++ b/drivers/staging/media/Kconfig
@@ -34,6 +34,4 @@ source "drivers/staging/media/s5p-cec/Kconfig"
 # Keep LIRC at the end, as it has sub-menus
 source "drivers/staging/media/lirc/Kconfig"
 
-source "drivers/staging/media/st-cec/Kconfig"
-
 endif
diff --git a/drivers/staging/media/Makefile b/drivers/staging/media/Makefile
index dc89325..75e47dc 100644
--- a/drivers/staging/media/Makefile
+++ b/drivers/staging/media/Makefile
@@ -5,4 +5,3 @@ obj-$(CONFIG_LIRC_STAGING)	+= lirc/
 obj-$(CONFIG_VIDEO_BCM2835)	+= platform/bcm2835/
 obj-$(CONFIG_VIDEO_DM365_VPFE)	+= davinci_vpfe/
 obj-$(CONFIG_VIDEO_OMAP4)	+= omap4iss/
-obj-$(CONFIG_VIDEO_STI_HDMI_CEC) += st-cec/
diff --git a/drivers/staging/media/st-cec/Kconfig b/drivers/staging/media/st-cec/Kconfig
deleted file mode 100644
index c04283d..0000000
--- a/drivers/staging/media/st-cec/Kconfig
+++ /dev/null
@@ -1,8 +0,0 @@
-config VIDEO_STI_HDMI_CEC
-       tristate "STMicroelectronics STiH4xx HDMI CEC driver"
-       depends on VIDEO_DEV && MEDIA_CEC_SUPPORT && (ARCH_STI || COMPILE_TEST)
-       ---help---
-         This is a driver for STIH4xx HDMI CEC interface. It uses the
-         generic CEC framework interface.
-         CEC bus is present in the HDMI connector and enables communication
-         between compatible devices.
diff --git a/drivers/staging/media/st-cec/TODO b/drivers/staging/media/st-cec/TODO
deleted file mode 100644
index c612897..0000000
--- a/drivers/staging/media/st-cec/TODO
+++ /dev/null
@@ -1,7 +0,0 @@
-This driver requires that userspace sets the physical address.
-However, this should be passed on from the corresponding
-ST HDMI driver.
-
-We have to wait until the HDMI notifier framework has been merged
-in order to handle this gracefully, until that time this driver
-has to remain in staging.