diff options
| -rw-r--r-- | drivers/media/cec/cec-notifier.c | 30 | ||||
| -rw-r--r-- | include/media/cec-notifier.h | 19 |
2 files changed, 48 insertions, 1 deletions
diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c index dd2078b27a41..9598c7778871 100644 --- a/drivers/media/cec/cec-notifier.c +++ b/drivers/media/cec/cec-notifier.c @@ -11,6 +11,7 @@ #include <linux/slab.h> #include <linux/list.h> #include <linux/kref.h> +#include <linux/of_platform.h> #include <media/cec.h> #include <media/cec-notifier.h> @@ -127,3 +128,32 @@ void cec_notifier_unregister(struct cec_notifier *n) cec_notifier_put(n); } EXPORT_SYMBOL_GPL(cec_notifier_unregister); + +struct device *cec_notifier_parse_hdmi_phandle(struct device *dev) +{ + struct platform_device *hdmi_pdev; + struct device *hdmi_dev = NULL; + struct device_node *np; + + np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0); + + if (!np) { + dev_err(dev, "Failed to find HDMI node in device tree\n"); + return ERR_PTR(-ENODEV); + } + hdmi_pdev = of_find_device_by_node(np); + of_node_put(np); + if (hdmi_pdev) { + hdmi_dev = &hdmi_pdev->dev; + /* + * Note that the device struct is only used as a key into the + * cec_notifiers list, it is never actually accessed. + * So we decrement the reference here so we don't leak + * memory. + */ + put_device(hdmi_dev); + return hdmi_dev; + } + return ERR_PTR(-EPROBE_DEFER); +} +EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle); diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h index 814eeef35a5c..57b3a9f6ea1d 100644 --- a/include/media/cec-notifier.h +++ b/include/media/cec-notifier.h @@ -9,7 +9,7 @@ #ifndef LINUX_CEC_NOTIFIER_H #define LINUX_CEC_NOTIFIER_H -#include <linux/types.h> +#include <linux/err.h> #include <media/cec.h> struct device; @@ -87,6 +87,17 @@ void cec_notifier_unregister(struct cec_notifier *n); void cec_register_cec_notifier(struct cec_adapter *adap, struct cec_notifier *notifier); +/** + * cec_notifier_parse_hdmi_phandle - find the hdmi device from "hdmi-phandle" + * @dev: the device with the "hdmi-phandle" device tree property + * + * Returns the device pointer referenced by the "hdmi-phandle" property. + * Note that the refcount of the returned device is not incremented. + * This device pointer is only used as a key value in the notifier + * list, but it is never accessed by the CEC driver. + */ +struct device *cec_notifier_parse_hdmi_phandle(struct device *dev); + #else static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn) @@ -122,6 +133,12 @@ static inline void cec_register_cec_notifier(struct cec_adapter *adap, struct cec_notifier *notifier) { } + +static inline struct device *cec_notifier_parse_hdmi_phandle(struct device *dev) +{ + return ERR_PTR(-ENODEV); +} + #endif /** |