linux/include/media/cec.h
Hans Verkuil f51e80804f [media] cec: pass parent device in register(), not allocate()
The cec_allocate_adapter function doesn't need the parent device, only the
cec_register_adapter function needs it.

Drop the cec_devnode parent field, since devnode.dev.parent can be used
instead.

This change makes the framework consistent with other frameworks where the
parent device is not used until the device is registered.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-11-29 12:07:17 -02:00

240 lines
6.4 KiB
C

/*
* 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
* @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;
/* device info */
int minor;
bool registered;
bool unregistered;
struct list_head fhs;
struct mutex lock;
};
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 received 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_RX_QUEUE_SZ (18 * 3)
/*
* The transmit queue is limited to 1 second worth of messages (worst case).
* Messages can be transmitted by userspace and kernel space. But for both it
* makes no sense to have a lot of messages queued up. One second seems
* reasonable.
*/
#define CEC_MAX_MSG_TX_QUEUE_SZ (18 * 1)
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;
unsigned int transmit_queue_sz;
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_SUPPORT)
struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
void *priv, const char *name, u32 caps, u8 available_las);
int cec_register_adapter(struct cec_adapter *adap, struct device *parent);
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,
struct device *parent)
{
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 */