mirror of https://gitee.com/openkylin/linux.git
[media] cec: add HDMI CEC framework (core)
The added HDMI CEC framework provides a generic kernel interface for HDMI CEC devices. Note that the CEC framework is added to staging/media and that the cec.h and cec-funcs.h headers are not exported yet. While the kABI is mature, I would prefer to allow the uABI some more time before it is mainlined in case it needs more tweaks. This adds the cec-core.c, media/cec.h and cec-priv.h sources. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> [k.debski@samsung.com: Merged CEC Updates commit by Hans Verkuil] [k.debski@samsung.com: Merged Update author commit by Hans Verkuil] [k.debski@samsung.com: code cleanup and fixes] [k.debski@samsung.com: add missing CEC commands to match spec] [k.debski@samsung.com: add RC framework support] [k.debski@samsung.com: move and edit documentation] [k.debski@samsung.com: add vendor id reporting] [k.debski@samsung.com: reorder of API structs and add reserved fields] [k.debski@samsung.com: fix handling of events and fix 32/64bit timespec problem] [k.debski@samsung.com: add sequence number handling] [k.debski@samsung.com: add passthrough mode] [k.debski@samsung.com: fix CEC defines, add missing CEC 2.0 commands] Signed-off-by: Kamil Debski <kamil@wypas.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
50f7d5a65e
commit
a56960e8b4
|
|
@ -0,0 +1,409 @@
|
|||
/*
|
||||
* cec-core.c - HDMI Consumer Electronics Control framework - Core
|
||||
*
|
||||
* Copyright 2016 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.
|
||||
*/
|
||||
|
||||
#include <linux/errno.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/kmod.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#include "cec-priv.h"
|
||||
|
||||
#define CEC_NUM_DEVICES 256
|
||||
#define CEC_NAME "cec"
|
||||
|
||||
int cec_debug;
|
||||
module_param_named(debug, cec_debug, int, 0644);
|
||||
MODULE_PARM_DESC(debug, "debug level (0-2)");
|
||||
|
||||
static dev_t cec_dev_t;
|
||||
|
||||
/* Active devices */
|
||||
static DEFINE_MUTEX(cec_devnode_lock);
|
||||
static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
|
||||
|
||||
static struct dentry *top_cec_dir;
|
||||
|
||||
/* dev to cec_devnode */
|
||||
#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
|
||||
|
||||
int cec_get_device(struct cec_devnode *devnode)
|
||||
{
|
||||
/*
|
||||
* Check if the cec device is available. This needs to be done with
|
||||
* the cec_devnode_lock held to prevent an open/unregister race:
|
||||
* without the lock, the device could be unregistered and freed between
|
||||
* the devnode->registered check and get_device() calls, leading to
|
||||
* a crash.
|
||||
*/
|
||||
mutex_lock(&cec_devnode_lock);
|
||||
/*
|
||||
* return ENXIO if the cec device has been removed
|
||||
* already or if it is not registered anymore.
|
||||
*/
|
||||
if (!devnode->registered) {
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
return -ENXIO;
|
||||
}
|
||||
/* and increase the device refcount */
|
||||
get_device(&devnode->dev);
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void cec_put_device(struct cec_devnode *devnode)
|
||||
{
|
||||
mutex_lock(&cec_devnode_lock);
|
||||
put_device(&devnode->dev);
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
}
|
||||
|
||||
/* Called when the last user of the cec device exits. */
|
||||
static void cec_devnode_release(struct device *cd)
|
||||
{
|
||||
struct cec_devnode *devnode = to_cec_devnode(cd);
|
||||
|
||||
mutex_lock(&cec_devnode_lock);
|
||||
|
||||
/* Mark device node number as free */
|
||||
clear_bit(devnode->minor, cec_devnode_nums);
|
||||
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
cec_delete_adapter(to_cec_adapter(devnode));
|
||||
}
|
||||
|
||||
static struct bus_type cec_bus_type = {
|
||||
.name = CEC_NAME,
|
||||
};
|
||||
|
||||
/*
|
||||
* Register a cec device node
|
||||
*
|
||||
* The registration code assigns minor numbers and registers the new device node
|
||||
* with the kernel. An error is returned if no free minor number can be found,
|
||||
* or if the registration of the device node fails.
|
||||
*
|
||||
* Zero is returned on success.
|
||||
*
|
||||
* Note that if the cec_devnode_register call fails, the release() callback of
|
||||
* the cec_devnode structure is *not* called, so the caller is responsible for
|
||||
* freeing any data.
|
||||
*/
|
||||
static int __must_check cec_devnode_register(struct cec_devnode *devnode,
|
||||
struct module *owner)
|
||||
{
|
||||
int minor;
|
||||
int ret;
|
||||
|
||||
/* Initialization */
|
||||
INIT_LIST_HEAD(&devnode->fhs);
|
||||
mutex_init(&devnode->fhs_lock);
|
||||
|
||||
/* Part 1: Find a free minor number */
|
||||
mutex_lock(&cec_devnode_lock);
|
||||
minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
|
||||
if (minor == CEC_NUM_DEVICES) {
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
pr_err("could not get a free minor\n");
|
||||
return -ENFILE;
|
||||
}
|
||||
|
||||
set_bit(minor, cec_devnode_nums);
|
||||
mutex_unlock(&cec_devnode_lock);
|
||||
|
||||
devnode->minor = minor;
|
||||
devnode->dev.bus = &cec_bus_type;
|
||||
devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
|
||||
devnode->dev.release = cec_devnode_release;
|
||||
devnode->dev.parent = devnode->parent;
|
||||
dev_set_name(&devnode->dev, "cec%d", devnode->minor);
|
||||
device_initialize(&devnode->dev);
|
||||
|
||||
/* Part 2: Initialize and register the character device */
|
||||
cdev_init(&devnode->cdev, &cec_devnode_fops);
|
||||
devnode->cdev.kobj.parent = &devnode->dev.kobj;
|
||||
devnode->cdev.owner = owner;
|
||||
|
||||
ret = cdev_add(&devnode->cdev, devnode->dev.devt, 1);
|
||||
if (ret < 0) {
|
||||
pr_err("%s: cdev_add failed\n", __func__);
|
||||
goto clr_bit;
|
||||
}
|
||||
|
||||
ret = device_add(&devnode->dev);
|
||||
if (ret)
|
||||
goto cdev_del;
|
||||
|
||||
devnode->registered = true;
|
||||
return 0;
|
||||
|
||||
cdev_del:
|
||||
cdev_del(&devnode->cdev);
|
||||
clr_bit:
|
||||
clear_bit(devnode->minor, cec_devnode_nums);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Unregister a cec device node
|
||||
*
|
||||
* This unregisters the passed device. Future open calls will be met with
|
||||
* errors.
|
||||
*
|
||||
* This function can safely be called if the device node has never been
|
||||
* registered or has already been unregistered.
|
||||
*/
|
||||
static void cec_devnode_unregister(struct cec_devnode *devnode)
|
||||
{
|
||||
struct cec_fh *fh;
|
||||
|
||||
/* Check if devnode was never registered or already unregistered */
|
||||
if (!devnode->registered || devnode->unregistered)
|
||||
return;
|
||||
|
||||
mutex_lock(&devnode->fhs_lock);
|
||||
list_for_each_entry(fh, &devnode->fhs, list)
|
||||
wake_up_interruptible(&fh->wait);
|
||||
mutex_unlock(&devnode->fhs_lock);
|
||||
|
||||
devnode->registered = false;
|
||||
devnode->unregistered = true;
|
||||
device_del(&devnode->dev);
|
||||
cdev_del(&devnode->cdev);
|
||||
put_device(&devnode->dev);
|
||||
}
|
||||
|
||||
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
|
||||
void *priv, const char *name, u32 caps,
|
||||
u8 available_las, struct device *parent)
|
||||
{
|
||||
struct cec_adapter *adap;
|
||||
int res;
|
||||
|
||||
if (WARN_ON(!parent))
|
||||
return ERR_PTR(-EINVAL);
|
||||
if (WARN_ON(!caps))
|
||||
return ERR_PTR(-EINVAL);
|
||||
if (WARN_ON(!ops))
|
||||
return ERR_PTR(-EINVAL);
|
||||
if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
|
||||
return ERR_PTR(-EINVAL);
|
||||
adap = kzalloc(sizeof(*adap), GFP_KERNEL);
|
||||
if (!adap)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
adap->owner = parent->driver->owner;
|
||||
adap->devnode.parent = parent;
|
||||
strlcpy(adap->name, name, sizeof(adap->name));
|
||||
adap->phys_addr = CEC_PHYS_ADDR_INVALID;
|
||||
adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
|
||||
adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
|
||||
adap->capabilities = caps;
|
||||
adap->available_log_addrs = available_las;
|
||||
adap->sequence = 0;
|
||||
adap->ops = ops;
|
||||
adap->priv = priv;
|
||||
memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
|
||||
mutex_init(&adap->lock);
|
||||
INIT_LIST_HEAD(&adap->transmit_queue);
|
||||
INIT_LIST_HEAD(&adap->wait_queue);
|
||||
init_waitqueue_head(&adap->kthread_waitq);
|
||||
|
||||
adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
|
||||
if (IS_ERR(adap->kthread)) {
|
||||
pr_err("cec-%s: kernel_thread() failed\n", name);
|
||||
res = PTR_ERR(adap->kthread);
|
||||
kfree(adap);
|
||||
return ERR_PTR(res);
|
||||
}
|
||||
|
||||
if (!(caps & CEC_CAP_RC))
|
||||
return adap;
|
||||
|
||||
#if IS_ENABLED(CONFIG_RC_CORE)
|
||||
/* Prepare the RC input device */
|
||||
adap->rc = rc_allocate_device();
|
||||
if (!adap->rc) {
|
||||
pr_err("cec-%s: failed to allocate memory for rc_dev\n",
|
||||
name);
|
||||
kthread_stop(adap->kthread);
|
||||
kfree(adap);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
snprintf(adap->input_name, sizeof(adap->input_name),
|
||||
"RC for %s", name);
|
||||
snprintf(adap->input_phys, sizeof(adap->input_phys),
|
||||
"%s/input0", name);
|
||||
|
||||
adap->rc->input_name = adap->input_name;
|
||||
adap->rc->input_phys = adap->input_phys;
|
||||
adap->rc->input_id.bustype = BUS_CEC;
|
||||
adap->rc->input_id.vendor = 0;
|
||||
adap->rc->input_id.product = 0;
|
||||
adap->rc->input_id.version = 1;
|
||||
adap->rc->dev.parent = parent;
|
||||
adap->rc->driver_type = RC_DRIVER_SCANCODE;
|
||||
adap->rc->driver_name = CEC_NAME;
|
||||
adap->rc->allowed_protocols = RC_BIT_CEC;
|
||||
adap->rc->priv = adap;
|
||||
adap->rc->map_name = RC_MAP_CEC;
|
||||
adap->rc->timeout = MS_TO_NS(100);
|
||||
#else
|
||||
adap->capabilities &= ~CEC_CAP_RC;
|
||||
#endif
|
||||
return adap;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cec_allocate_adapter);
|
||||
|
||||
int cec_register_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
int res;
|
||||
|
||||
if (IS_ERR_OR_NULL(adap))
|
||||
return 0;
|
||||
|
||||
#if IS_ENABLED(CONFIG_RC_CORE)
|
||||
if (adap->capabilities & CEC_CAP_RC) {
|
||||
res = rc_register_device(adap->rc);
|
||||
|
||||
if (res) {
|
||||
pr_err("cec-%s: failed to prepare input device\n",
|
||||
adap->name);
|
||||
rc_free_device(adap->rc);
|
||||
adap->rc = NULL;
|
||||
return res;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
res = cec_devnode_register(&adap->devnode, adap->owner);
|
||||
if (res) {
|
||||
#if IS_ENABLED(CONFIG_RC_CORE)
|
||||
/* Note: rc_unregister also calls rc_free */
|
||||
rc_unregister_device(adap->rc);
|
||||
adap->rc = NULL;
|
||||
#endif
|
||||
return res;
|
||||
}
|
||||
|
||||
dev_set_drvdata(&adap->devnode.dev, adap);
|
||||
#ifdef CONFIG_MEDIA_CEC_DEBUG
|
||||
if (!top_cec_dir)
|
||||
return 0;
|
||||
|
||||
adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
|
||||
if (IS_ERR_OR_NULL(adap->cec_dir)) {
|
||||
pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
|
||||
return 0;
|
||||
}
|
||||
adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
|
||||
"status", adap->cec_dir, cec_adap_status);
|
||||
if (IS_ERR_OR_NULL(adap->status_file)) {
|
||||
pr_warn("cec-%s: Failed to create status file\n", adap->name);
|
||||
debugfs_remove_recursive(adap->cec_dir);
|
||||
adap->cec_dir = NULL;
|
||||
}
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cec_register_adapter);
|
||||
|
||||
void cec_unregister_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
if (IS_ERR_OR_NULL(adap))
|
||||
return;
|
||||
|
||||
#if IS_ENABLED(CONFIG_RC_CORE)
|
||||
/* Note: rc_unregister also calls rc_free */
|
||||
rc_unregister_device(adap->rc);
|
||||
adap->rc = NULL;
|
||||
#endif
|
||||
debugfs_remove_recursive(adap->cec_dir);
|
||||
cec_devnode_unregister(&adap->devnode);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cec_unregister_adapter);
|
||||
|
||||
void cec_delete_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
if (IS_ERR_OR_NULL(adap))
|
||||
return;
|
||||
mutex_lock(&adap->lock);
|
||||
__cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
|
||||
mutex_unlock(&adap->lock);
|
||||
kthread_stop(adap->kthread);
|
||||
if (adap->kthread_config)
|
||||
kthread_stop(adap->kthread_config);
|
||||
#if IS_ENABLED(CONFIG_RC_CORE)
|
||||
if (adap->rc)
|
||||
rc_free_device(adap->rc);
|
||||
#endif
|
||||
kfree(adap);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cec_delete_adapter);
|
||||
|
||||
/*
|
||||
* Initialise cec for linux
|
||||
*/
|
||||
static int __init cec_devnode_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
pr_info("Linux cec interface: v0.10\n");
|
||||
ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES,
|
||||
CEC_NAME);
|
||||
if (ret < 0) {
|
||||
pr_warn("cec: unable to allocate major\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MEDIA_CEC_DEBUG
|
||||
top_cec_dir = debugfs_create_dir("cec", NULL);
|
||||
if (IS_ERR_OR_NULL(top_cec_dir)) {
|
||||
pr_warn("cec: Failed to create debugfs cec dir\n");
|
||||
top_cec_dir = NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
ret = bus_register(&cec_bus_type);
|
||||
if (ret < 0) {
|
||||
unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
|
||||
pr_warn("cec: bus_register failed\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit cec_devnode_exit(void)
|
||||
{
|
||||
debugfs_remove_recursive(top_cec_dir);
|
||||
bus_unregister(&cec_bus_type);
|
||||
unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
|
||||
}
|
||||
|
||||
subsys_initcall(cec_devnode_init);
|
||||
module_exit(cec_devnode_exit)
|
||||
|
||||
MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
|
||||
MODULE_DESCRIPTION("Device node registration for cec drivers");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
/*
|
||||
* cec-priv.h - HDMI Consumer Electronics Control internal header
|
||||
*
|
||||
* Copyright 2016 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 _CEC_PRIV_H
|
||||
#define _CEC_PRIV_H
|
||||
|
||||
#include <linux/cec-funcs.h>
|
||||
#include <media/cec.h>
|
||||
|
||||
#define dprintk(lvl, fmt, arg...) \
|
||||
do { \
|
||||
if (lvl <= cec_debug) \
|
||||
pr_info("cec-%s: " fmt, adap->name, ## arg); \
|
||||
} while (0)
|
||||
|
||||
/* devnode to cec_adapter */
|
||||
#define to_cec_adapter(node) container_of(node, struct cec_adapter, devnode)
|
||||
|
||||
/* cec-core.c */
|
||||
extern int cec_debug;
|
||||
int cec_get_device(struct cec_devnode *devnode);
|
||||
void cec_put_device(struct cec_devnode *devnode);
|
||||
|
||||
/* cec-adap.c */
|
||||
int cec_monitor_all_cnt_inc(struct cec_adapter *adap);
|
||||
void cec_monitor_all_cnt_dec(struct cec_adapter *adap);
|
||||
int cec_adap_status(struct seq_file *file, void *priv);
|
||||
int cec_thread_func(void *_adap);
|
||||
void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block);
|
||||
int __cec_s_log_addrs(struct cec_adapter *adap,
|
||||
struct cec_log_addrs *log_addrs, bool block);
|
||||
int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
|
||||
struct cec_fh *fh, bool block);
|
||||
void cec_queue_event_fh(struct cec_fh *fh,
|
||||
const struct cec_event *new_ev, u64 ts);
|
||||
|
||||
/* cec-api.c */
|
||||
extern const struct file_operations cec_devnode_fops;
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,232 @@
|
|||
/*
|
||||
* cec - HDMI Consumer Electronics Control support header
|
||||
*
|
||||
* Copyright 2016 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 _MEDIA_CEC_H
|
||||
#define _MEDIA_CEC_H
|
||||
|
||||
#include <linux/poll.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/cdev.h>
|
||||
#include <linux/kthread.h>
|
||||
#include <linux/timer.h>
|
||||
#include <linux/cec-funcs.h>
|
||||
#include <media/rc-core.h>
|
||||
#include <media/cec-edid.h>
|
||||
|
||||
/**
|
||||
* struct cec_devnode - cec device node
|
||||
* @dev: cec device
|
||||
* @cdev: cec character device
|
||||
* @parent: parent device
|
||||
* @minor: device node minor number
|
||||
* @registered: the device was correctly registered
|
||||
* @unregistered: the device was unregistered
|
||||
* @fhs_lock: lock to control access to the filehandle list
|
||||
* @fhs: the list of open filehandles (cec_fh)
|
||||
*
|
||||
* This structure represents a cec-related device node.
|
||||
*
|
||||
* The @parent is a physical device. It must be set by core or device drivers
|
||||
* before registering the node.
|
||||
*/
|
||||
struct cec_devnode {
|
||||
/* sysfs */
|
||||
struct device dev;
|
||||
struct cdev cdev;
|
||||
struct device *parent;
|
||||
|
||||
/* device info */
|
||||
int minor;
|
||||
bool registered;
|
||||
bool unregistered;
|
||||
struct mutex fhs_lock;
|
||||
struct list_head fhs;
|
||||
};
|
||||
|
||||
struct cec_adapter;
|
||||
struct cec_data;
|
||||
|
||||
struct cec_data {
|
||||
struct list_head list;
|
||||
struct list_head xfer_list;
|
||||
struct cec_adapter *adap;
|
||||
struct cec_msg msg;
|
||||
struct cec_fh *fh;
|
||||
struct delayed_work work;
|
||||
struct completion c;
|
||||
u8 attempts;
|
||||
bool new_initiator;
|
||||
bool blocking;
|
||||
bool completed;
|
||||
};
|
||||
|
||||
struct cec_msg_entry {
|
||||
struct list_head list;
|
||||
struct cec_msg msg;
|
||||
};
|
||||
|
||||
#define CEC_NUM_EVENTS CEC_EVENT_LOST_MSGS
|
||||
|
||||
struct cec_fh {
|
||||
struct list_head list;
|
||||
struct list_head xfer_list;
|
||||
struct cec_adapter *adap;
|
||||
u8 mode_initiator;
|
||||
u8 mode_follower;
|
||||
|
||||
/* Events */
|
||||
wait_queue_head_t wait;
|
||||
unsigned int pending_events;
|
||||
struct cec_event events[CEC_NUM_EVENTS];
|
||||
struct mutex lock;
|
||||
struct list_head msgs; /* queued messages */
|
||||
unsigned int queued_msgs;
|
||||
};
|
||||
|
||||
#define CEC_SIGNAL_FREE_TIME_RETRY 3
|
||||
#define CEC_SIGNAL_FREE_TIME_NEW_INITIATOR 5
|
||||
#define CEC_SIGNAL_FREE_TIME_NEXT_XFER 7
|
||||
|
||||
/* The nominal data bit period is 2.4 ms */
|
||||
#define CEC_FREE_TIME_TO_USEC(ft) ((ft) * 2400)
|
||||
|
||||
struct cec_adap_ops {
|
||||
/* Low-level callbacks */
|
||||
int (*adap_enable)(struct cec_adapter *adap, bool enable);
|
||||
int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool enable);
|
||||
int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
|
||||
int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
|
||||
u32 signal_free_time, struct cec_msg *msg);
|
||||
void (*adap_status)(struct cec_adapter *adap, struct seq_file *file);
|
||||
|
||||
/* High-level CEC message callback */
|
||||
int (*received)(struct cec_adapter *adap, struct cec_msg *msg);
|
||||
};
|
||||
|
||||
/*
|
||||
* The minimum message length you can receive (excepting poll messages) is 2.
|
||||
* With a transfer rate of at most 36 bytes per second this makes 18 messages
|
||||
* per second worst case.
|
||||
*
|
||||
* We queue at most 3 seconds worth of messages. The CEC specification requires
|
||||
* that messages are replied to within a second, so 3 seconds should give more
|
||||
* than enough margin. Since most messages are actually more than 2 bytes, this
|
||||
* is in practice a lot more than 3 seconds.
|
||||
*/
|
||||
#define CEC_MAX_MSG_QUEUE_SZ (18 * 3)
|
||||
|
||||
struct cec_adapter {
|
||||
struct module *owner;
|
||||
char name[32];
|
||||
struct cec_devnode devnode;
|
||||
struct mutex lock;
|
||||
struct rc_dev *rc;
|
||||
|
||||
struct list_head transmit_queue;
|
||||
struct list_head wait_queue;
|
||||
struct cec_data *transmitting;
|
||||
|
||||
struct task_struct *kthread_config;
|
||||
struct completion config_completion;
|
||||
|
||||
struct task_struct *kthread;
|
||||
wait_queue_head_t kthread_waitq;
|
||||
wait_queue_head_t waitq;
|
||||
|
||||
const struct cec_adap_ops *ops;
|
||||
void *priv;
|
||||
u32 capabilities;
|
||||
u8 available_log_addrs;
|
||||
|
||||
u16 phys_addr;
|
||||
bool is_configuring;
|
||||
bool is_configured;
|
||||
u32 monitor_all_cnt;
|
||||
u32 follower_cnt;
|
||||
struct cec_fh *cec_follower;
|
||||
struct cec_fh *cec_initiator;
|
||||
bool passthrough;
|
||||
struct cec_log_addrs log_addrs;
|
||||
|
||||
struct dentry *cec_dir;
|
||||
struct dentry *status_file;
|
||||
|
||||
u16 phys_addrs[15];
|
||||
u32 sequence;
|
||||
|
||||
char input_name[32];
|
||||
char input_phys[32];
|
||||
char input_drv[32];
|
||||
};
|
||||
|
||||
static inline bool cec_has_log_addr(const struct cec_adapter *adap, u8 log_addr)
|
||||
{
|
||||
return adap->log_addrs.log_addr_mask & (1 << log_addr);
|
||||
}
|
||||
|
||||
static inline bool cec_is_sink(const struct cec_adapter *adap)
|
||||
{
|
||||
return adap->phys_addr == 0;
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_MEDIA_CEC)
|
||||
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
|
||||
void *priv, const char *name, u32 caps, u8 available_las,
|
||||
struct device *parent);
|
||||
int cec_register_adapter(struct cec_adapter *adap);
|
||||
void cec_unregister_adapter(struct cec_adapter *adap);
|
||||
void cec_delete_adapter(struct cec_adapter *adap);
|
||||
|
||||
int cec_s_log_addrs(struct cec_adapter *adap, struct cec_log_addrs *log_addrs,
|
||||
bool block);
|
||||
void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
|
||||
bool block);
|
||||
int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
|
||||
bool block);
|
||||
|
||||
/* Called by the adapter */
|
||||
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);
|
||||
|
||||
#else
|
||||
|
||||
static inline int cec_register_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void cec_unregister_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void cec_delete_adapter(struct cec_adapter *adap)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
|
||||
bool block)
|
||||
{
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif /* _MEDIA_CEC_H */
|
||||
Loading…
Reference in New Issue