Merge "msm: cec: Use CEC notifier framework in adapter driver"

2 files changed, 121 insertions, 0 deletions

diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
new file mode 100644
index 000000000000..035712e0993d
--- /dev/null
+++ b/include/media/cec-notifier.h
@@ -0,0 +1,111 @@
+/*
+ * cec-notifier.h - notify CEC drivers of physical address changes
+ *
+ * Copyright 2016 Russell King <rmk+kernel@arm.linux.org.uk>
+ * Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef LINUX_CEC_NOTIFIER_H
+#define LINUX_CEC_NOTIFIER_H
+
+#include <linux/types.h>
+#include <media/cec-edid.h>
+
+struct device;
+struct edid;
+struct cec_adapter;
+struct cec_notifier;
+
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+
+/**
+ * cec_notifier_get - find or create a new cec_notifier for the given device.
+ * @dev: device that sends the events.
+ *
+ * If a notifier for device @dev already exists, then increase the refcount
+ * and return that notifier.
+ *
+ * If it doesn't exist, then allocate a new notifier struct and return a
+ * pointer to that new struct.
+ *
+ * Return NULL if the memory could not be allocated.
+ */
+struct cec_notifier *cec_notifier_get(struct device *dev);
+
+/**
+ * cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
+ * @n: notifier
+ */
+void cec_notifier_put(struct cec_notifier *n);
+
+/**
+ * cec_notifier_set_phys_addr - set a new physical address.
+ * @n: the CEC notifier
+ * @pa: the CEC physical address
+ *
+ * Set a new CEC physical address.
+ */
+void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa);
+
+/**
+ * cec_notifier_set_phys_addr_from_edid - set parse the PA from the EDID.
+ * @n: the CEC notifier
+ * @edid: the struct edid pointer
+ *
+ * Parses the EDID to obtain the new CEC physical address and set it.
+ */
+void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
+					  const struct edid *edid);
+
+/**
+ * cec_notifier_register - register a callback with the notifier
+ * @n: the CEC notifier
+ * @adap: the CEC adapter, passed as argument to the callback function
+ * @callback: the callback function
+ */
+void cec_notifier_register(struct cec_notifier *n,
+			   struct cec_adapter *adap,
+			   void (*callback)(struct cec_adapter *adap, u16 pa));
+
+/**
+ * cec_notifier_unregister - unregister the callback from the notifier.
+ * @n: the CEC notifier
+ */
+void cec_notifier_unregister(struct cec_notifier *n);
+
+#else
+static inline struct cec_notifier *cec_notifier_get(struct device *dev)
+{
+	/* A non-NULL pointer is expected on success */
+	return (struct cec_notifier *)0xdeadfeed;
+}
+
+static inline void cec_notifier_put(struct cec_notifier *n)
+{
+}
+
+static inline void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
+{
+}
+
+static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
+							const struct edid *edid)
+{
+}
+
+#endif
+
+#endif
diff --git a/include/media/cec.h b/include/media/cec.h
index 96a0aa770d61..307f5dcaf034 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -30,6 +30,7 @@
 #include <linux/cec-funcs.h>
 #include <media/rc-core.h>
 #include <media/cec-edid.h>
+#include <media/cec-notifier.h>
 
 /**
  * struct cec_devnode - cec device node
@@ -173,6 +174,10 @@ struct cec_adapter {
 	bool passthrough;
 	struct cec_log_addrs log_addrs;
 
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+	struct cec_notifier *notifier;
+#endif
+
 	struct dentry *cec_dir;
 	struct dentry *status_file;
 
@@ -213,6 +218,11 @@ void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
 		       u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
 void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
 
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+void cec_register_cec_notifier(struct cec_adapter *adap,
+			       struct cec_notifier *notifier);
+#endif
+
 #else
 
 static inline int cec_register_adapter(struct cec_adapter *adap,