453 lines
12 KiB
C
453 lines
12 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-notifier.h>
|
|
|
|
#define CEC_CAP_DEFAULTS (CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT | \
|
|
CEC_CAP_PASSTHROUGH | CEC_CAP_RC)
|
|
|
|
/**
|
|
* 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_pin;
|
|
|
|
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;
|
|
};
|
|
|
|
struct cec_event_entry {
|
|
struct list_head list;
|
|
struct cec_event ev;
|
|
};
|
|
|
|
#define CEC_NUM_CORE_EVENTS 2
|
|
#define CEC_NUM_EVENTS CEC_EVENT_PIN_HPD_HIGH
|
|
|
|
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;
|
|
struct mutex lock;
|
|
struct list_head events[CEC_NUM_EVENTS]; /* queued events */
|
|
u8 queued_events[CEC_NUM_EVENTS];
|
|
unsigned int total_queued_events;
|
|
struct cec_event_entry core_events[CEC_NUM_CORE_EVENTS];
|
|
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);
|
|
void (*adap_free)(struct cec_adapter *adap);
|
|
|
|
/* 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 needs_hpd;
|
|
bool is_configuring;
|
|
bool is_configured;
|
|
bool cec_pin_is_high;
|
|
u32 monitor_all_cnt;
|
|
u32 monitor_pin_cnt;
|
|
u32 follower_cnt;
|
|
struct cec_fh *cec_follower;
|
|
struct cec_fh *cec_initiator;
|
|
bool passthrough;
|
|
struct cec_log_addrs log_addrs;
|
|
|
|
u32 tx_timeouts;
|
|
|
|
#ifdef CONFIG_MEDIA_CEC_RC
|
|
bool rc_repeating;
|
|
int rc_last_scancode;
|
|
u64 rc_last_keypress;
|
|
#endif
|
|
#ifdef CONFIG_CEC_NOTIFIER
|
|
struct cec_notifier *notifier;
|
|
#endif
|
|
#ifdef CONFIG_CEC_PIN
|
|
struct cec_pin *pin;
|
|
#endif
|
|
|
|
struct dentry *cec_dir;
|
|
struct dentry *status_file;
|
|
|
|
u16 phys_addrs[15];
|
|
u32 sequence;
|
|
|
|
char device_name[32];
|
|
char input_phys[32];
|
|
char input_drv[32];
|
|
};
|
|
|
|
static inline void *cec_get_drvdata(const struct cec_adapter *adap)
|
|
{
|
|
return adap->priv;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#define cec_phys_addr_exp(pa) \
|
|
((pa) >> 12), ((pa) >> 8) & 0xf, ((pa) >> 4) & 0xf, (pa) & 0xf
|
|
|
|
struct edid;
|
|
|
|
#if IS_REACHABLE(CONFIG_CEC_CORE)
|
|
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);
|
|
void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
|
|
const struct edid *edid);
|
|
int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
|
|
bool block);
|
|
|
|
/* Called by the adapter */
|
|
void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
|
|
u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
|
|
u8 error_cnt, ktime_t ts);
|
|
|
|
static inline void cec_transmit_done(struct cec_adapter *adap, u8 status,
|
|
u8 arb_lost_cnt, u8 nack_cnt,
|
|
u8 low_drive_cnt, u8 error_cnt)
|
|
{
|
|
cec_transmit_done_ts(adap, status, arb_lost_cnt, nack_cnt,
|
|
low_drive_cnt, error_cnt, ktime_get());
|
|
}
|
|
/*
|
|
* Simplified version of cec_transmit_done for hardware that doesn't retry
|
|
* failed transmits. So this is always just one attempt in which case
|
|
* the status is sufficient.
|
|
*/
|
|
void cec_transmit_attempt_done_ts(struct cec_adapter *adap,
|
|
u8 status, ktime_t ts);
|
|
|
|
static inline void cec_transmit_attempt_done(struct cec_adapter *adap,
|
|
u8 status)
|
|
{
|
|
cec_transmit_attempt_done_ts(adap, status, ktime_get());
|
|
}
|
|
|
|
void cec_received_msg_ts(struct cec_adapter *adap,
|
|
struct cec_msg *msg, ktime_t ts);
|
|
|
|
static inline void cec_received_msg(struct cec_adapter *adap,
|
|
struct cec_msg *msg)
|
|
{
|
|
cec_received_msg_ts(adap, msg, ktime_get());
|
|
}
|
|
|
|
/**
|
|
* cec_queue_pin_cec_event() - queue a CEC pin event with a given timestamp.
|
|
*
|
|
* @adap: pointer to the cec adapter
|
|
* @is_high: when true the CEC pin is high, otherwise it is low
|
|
* @ts: the timestamp for this event
|
|
*
|
|
*/
|
|
void cec_queue_pin_cec_event(struct cec_adapter *adap,
|
|
bool is_high, ktime_t ts);
|
|
|
|
/**
|
|
* cec_queue_pin_hpd_event() - queue a pin event with a given timestamp.
|
|
*
|
|
* @adap: pointer to the cec adapter
|
|
* @is_high: when true the HPD pin is high, otherwise it is low
|
|
* @ts: the timestamp for this event
|
|
*
|
|
*/
|
|
void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
|
|
|
|
/**
|
|
* cec_get_edid_phys_addr() - find and return the physical address
|
|
*
|
|
* @edid: pointer to the EDID data
|
|
* @size: size in bytes of the EDID data
|
|
* @offset: If not %NULL then the location of the physical address
|
|
* bytes in the EDID will be returned here. This is set to 0
|
|
* if there is no physical address found.
|
|
*
|
|
* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
|
|
*/
|
|
u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
|
|
unsigned int *offset);
|
|
|
|
/**
|
|
* cec_set_edid_phys_addr() - find and set the physical address
|
|
*
|
|
* @edid: pointer to the EDID data
|
|
* @size: size in bytes of the EDID data
|
|
* @phys_addr: the new physical address
|
|
*
|
|
* This function finds the location of the physical address in the EDID
|
|
* and fills in the given physical address and updates the checksum
|
|
* at the end of the EDID block. It does nothing if the EDID doesn't
|
|
* contain a physical address.
|
|
*/
|
|
void cec_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr);
|
|
|
|
/**
|
|
* cec_phys_addr_for_input() - calculate the PA for an input
|
|
*
|
|
* @phys_addr: the physical address of the parent
|
|
* @input: the number of the input port, must be between 1 and 15
|
|
*
|
|
* This function calculates a new physical address based on the input
|
|
* port number. For example:
|
|
*
|
|
* PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
|
|
*
|
|
* PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
|
|
*
|
|
* PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
|
|
*
|
|
* PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
|
|
*
|
|
* Return: the new physical address or CEC_PHYS_ADDR_INVALID.
|
|
*/
|
|
u16 cec_phys_addr_for_input(u16 phys_addr, u8 input);
|
|
|
|
/**
|
|
* cec_phys_addr_validate() - validate a physical address from an EDID
|
|
*
|
|
* @phys_addr: the physical address to validate
|
|
* @parent: if not %NULL, then this is filled with the parents PA.
|
|
* @port: if not %NULL, then this is filled with the input port.
|
|
*
|
|
* This validates a physical address as read from an EDID. If the
|
|
* PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
|
|
* then it will return -EINVAL.
|
|
*
|
|
* The parent PA is passed into %parent and the input port is passed into
|
|
* %port. For example:
|
|
*
|
|
* PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
|
|
*
|
|
* PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
|
|
*
|
|
* PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
|
|
*
|
|
* PA = f.f.f.f: has parent f.f.f.f and input port 0.
|
|
*
|
|
* Return: 0 if the PA is valid, -EINVAL if not.
|
|
*/
|
|
int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port);
|
|
|
|
#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)
|
|
{
|
|
}
|
|
|
|
static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
|
|
const struct edid *edid)
|
|
{
|
|
}
|
|
|
|
static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
|
|
unsigned int *offset)
|
|
{
|
|
if (offset)
|
|
*offset = 0;
|
|
return CEC_PHYS_ADDR_INVALID;
|
|
}
|
|
|
|
static inline void cec_set_edid_phys_addr(u8 *edid, unsigned int size,
|
|
u16 phys_addr)
|
|
{
|
|
}
|
|
|
|
static inline u16 cec_phys_addr_for_input(u16 phys_addr, u8 input)
|
|
{
|
|
return CEC_PHYS_ADDR_INVALID;
|
|
}
|
|
|
|
static inline int cec_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
|
|
{
|
|
if (parent)
|
|
*parent = phys_addr;
|
|
if (port)
|
|
*port = 0;
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/**
|
|
* cec_phys_addr_invalidate() - set the physical address to INVALID
|
|
*
|
|
* @adap: the CEC adapter
|
|
*
|
|
* This is a simple helper function to invalidate the physical
|
|
* address.
|
|
*/
|
|
static inline void cec_phys_addr_invalidate(struct cec_adapter *adap)
|
|
{
|
|
cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
|
|
}
|
|
|
|
#endif /* _MEDIA_CEC_H */
|