// SPDX-License-Identifier: GPL-2.0-only
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/*
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* cec-notifier.c - notify CEC drivers of physical address changes
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*
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* Copyright 2016 Russell King.
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* Copyright 2016-2017 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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*/
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/kref.h>
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#include <linux/of_platform.h>
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#include <media/cec.h>
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#include <media/cec-notifier.h>
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#include <drm/drm_edid.h>
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struct cec_notifier {
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struct mutex lock;
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struct list_head head;
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struct kref kref;
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struct device *hdmi_dev;
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struct cec_connector_info conn_info;
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const char *port_name;
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struct cec_adapter *cec_adap;
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u16 phys_addr;
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};
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static LIST_HEAD(cec_notifiers);
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static DEFINE_MUTEX(cec_notifiers_lock);
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/**
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* cec_notifier_get_conn - find or create a new cec_notifier for the given
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* device and connector tuple.
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* @hdmi_dev: device that sends the events.
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* @port_name: the connector name from which the event occurs
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*
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* If a notifier for device @dev already exists, then increase the refcount
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* and return that notifier.
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*
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* If it doesn't exist, then allocate a new notifier struct and return a
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* pointer to that new struct.
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*
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* Return NULL if the memory could not be allocated.
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*/
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static struct cec_notifier *
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cec_notifier_get_conn(struct device *hdmi_dev, const char *port_name)
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{
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struct cec_notifier *n;
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mutex_lock(&cec_notifiers_lock);
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list_for_each_entry(n, &cec_notifiers, head) {
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if (n->hdmi_dev == hdmi_dev &&
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(!port_name ||
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(n->port_name && !strcmp(n->port_name, port_name)))) {
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kref_get(&n->kref);
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mutex_unlock(&cec_notifiers_lock);
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return n;
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}
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}
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n = kzalloc(sizeof(*n), GFP_KERNEL);
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if (!n)
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goto unlock;
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n->hdmi_dev = hdmi_dev;
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if (port_name) {
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n->port_name = kstrdup(port_name, GFP_KERNEL);
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if (!n->port_name) {
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kfree(n);
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n = NULL;
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goto unlock;
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}
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}
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n->phys_addr = CEC_PHYS_ADDR_INVALID;
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mutex_init(&n->lock);
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kref_init(&n->kref);
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list_add_tail(&n->head, &cec_notifiers);
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unlock:
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mutex_unlock(&cec_notifiers_lock);
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return n;
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}
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static void cec_notifier_release(struct kref *kref)
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{
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struct cec_notifier *n =
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container_of(kref, struct cec_notifier, kref);
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list_del(&n->head);
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kfree(n->port_name);
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kfree(n);
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}
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static void cec_notifier_put(struct cec_notifier *n)
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{
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mutex_lock(&cec_notifiers_lock);
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kref_put(&n->kref, cec_notifier_release);
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mutex_unlock(&cec_notifiers_lock);
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}
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struct cec_notifier *
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cec_notifier_conn_register(struct device *hdmi_dev, const char *port_name,
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const struct cec_connector_info *conn_info)
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{
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struct cec_notifier *n = cec_notifier_get_conn(hdmi_dev, port_name);
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if (!n)
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return n;
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mutex_lock(&n->lock);
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n->phys_addr = CEC_PHYS_ADDR_INVALID;
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if (conn_info)
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n->conn_info = *conn_info;
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else
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memset(&n->conn_info, 0, sizeof(n->conn_info));
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if (n->cec_adap) {
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if (!n->cec_adap->adap_controls_phys_addr)
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cec_phys_addr_invalidate(n->cec_adap);
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cec_s_conn_info(n->cec_adap, conn_info);
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}
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mutex_unlock(&n->lock);
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return n;
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}
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EXPORT_SYMBOL_GPL(cec_notifier_conn_register);
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void cec_notifier_conn_unregister(struct cec_notifier *n)
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{
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if (!n)
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return;
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mutex_lock(&n->lock);
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memset(&n->conn_info, 0, sizeof(n->conn_info));
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n->phys_addr = CEC_PHYS_ADDR_INVALID;
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if (n->cec_adap) {
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if (!n->cec_adap->adap_controls_phys_addr)
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cec_phys_addr_invalidate(n->cec_adap);
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cec_s_conn_info(n->cec_adap, NULL);
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}
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mutex_unlock(&n->lock);
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cec_notifier_put(n);
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}
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EXPORT_SYMBOL_GPL(cec_notifier_conn_unregister);
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struct cec_notifier *
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cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *port_name,
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struct cec_adapter *adap)
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{
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struct cec_notifier *n;
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if (WARN_ON(!adap))
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return NULL;
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n = cec_notifier_get_conn(hdmi_dev, port_name);
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if (!n)
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return n;
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mutex_lock(&n->lock);
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n->cec_adap = adap;
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adap->conn_info = n->conn_info;
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adap->notifier = n;
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if (!adap->adap_controls_phys_addr)
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cec_s_phys_addr(adap, n->phys_addr, false);
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mutex_unlock(&n->lock);
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return n;
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}
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EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_register);
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void cec_notifier_cec_adap_unregister(struct cec_notifier *n,
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struct cec_adapter *adap)
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{
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if (!n)
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return;
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mutex_lock(&n->lock);
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adap->notifier = NULL;
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n->cec_adap = NULL;
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mutex_unlock(&n->lock);
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cec_notifier_put(n);
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}
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EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_unregister);
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void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
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{
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if (n == NULL)
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return;
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mutex_lock(&n->lock);
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n->phys_addr = pa;
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if (n->cec_adap && !n->cec_adap->adap_controls_phys_addr)
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cec_s_phys_addr(n->cec_adap, n->phys_addr, false);
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mutex_unlock(&n->lock);
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}
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EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
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void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
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const struct edid *edid)
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{
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u16 pa = CEC_PHYS_ADDR_INVALID;
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if (n == NULL)
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return;
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if (edid && edid->extensions)
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pa = cec_get_edid_phys_addr((const u8 *)edid,
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EDID_LENGTH * (edid->extensions + 1), NULL);
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cec_notifier_set_phys_addr(n, pa);
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}
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EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
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struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
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{
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struct platform_device *hdmi_pdev;
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struct device *hdmi_dev = NULL;
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struct device_node *np;
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np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
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if (!np) {
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dev_err(dev, "Failed to find HDMI node in device tree\n");
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return ERR_PTR(-ENODEV);
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}
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hdmi_pdev = of_find_device_by_node(np);
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of_node_put(np);
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if (hdmi_pdev) {
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hdmi_dev = &hdmi_pdev->dev;
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/*
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* Note that the device struct is only used as a key into the
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* cec_notifiers list, it is never actually accessed.
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* So we decrement the reference here so we don't leak
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* memory.
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*/
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put_device(hdmi_dev);
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return hdmi_dev;
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}
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return ERR_PTR(-EPROBE_DEFER);
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}
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EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);
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