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media: cec: add support for 5V signal testing 

Add support for the new 5V CEC events

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-06-28 07:43:46 -04:00 committed by Mauro Carvalho Chehab
parent f48a534adb
commit 4786b0d6f3
4 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/media/cec/cec-adap.c
View File

@ -74,7 +74,7 @@ void cec_queue_event_fh(struct cec_fh *fh,
const struct cec_event *new_ev, u64 ts)
{
static const u16 max_events[CEC_NUM_EVENTS] = {
1, 1, 800, 800, 8, 8,
1, 1, 800, 800, 8, 8, 8, 8
};
struct cec_event_entry *entry;
unsigned int ev_idx = new_ev->event - 1;
@ -176,6 +176,22 @@ void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
}
EXPORT_SYMBOL_GPL(cec_queue_pin_hpd_event);
/* Notify userspace that the 5V pin changed state at the given time. */
void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts)
{
struct cec_event ev = {
.event = is_high ? CEC_EVENT_PIN_5V_HIGH :
CEC_EVENT_PIN_5V_LOW,
};
struct cec_fh *fh;
mutex_lock(&adap->devnode.lock);
list_for_each_entry(fh, &adap->devnode.fhs, list)
cec_queue_event_fh(fh, &ev, ktime_to_ns(ts));
mutex_unlock(&adap->devnode.lock);
}
EXPORT_SYMBOL_GPL(cec_queue_pin_5v_event);
/*
* Queue a new message for this filehandle.
*

8
drivers/media/cec/cec-api.c
View File

@ -579,6 +579,14 @@ static int cec_open(struct inode *inode, struct file *filp)
cec_queue_event_fh(fh, &ev, 0);
}
}
if (adap->pin && adap->pin->ops->read_5v) {
err = adap->pin->ops->read_5v(adap);
if (err >= 0) {
ev.event = err ? CEC_EVENT_PIN_5V_HIGH :
CEC_EVENT_PIN_5V_LOW;
cec_queue_event_fh(fh, &ev, 0);
}
}
#endif
list_add(&fh->list, &devnode->fhs);

4
include/media/cec-pin.h
View File

@ -25,6 +25,9 @@
* @read_hpd: read the HPD pin. Return true if high, false if low or
* an error if negative. If NULL or -ENOTTY is returned,
* then this is not supported.
* @read_5v: read the 5V pin. Return true if high, false if low or
* an error if negative. If NULL or -ENOTTY is returned,
* then this is not supported.
*
* These operations are used by the cec pin framework to manipulate
* the CEC pin.
@ -38,6 +41,7 @@ struct cec_pin_ops {
void (*free)(struct cec_adapter *adap);
void (*status)(struct cec_adapter *adap, struct seq_file *file);
int (*read_hpd)(struct cec_adapter *adap);
int (*read_5v)(struct cec_adapter *adap);
};
/**

12
include/media/cec.h
View File

@ -79,7 +79,7 @@ struct cec_event_entry {
};
#define CEC_NUM_CORE_EVENTS 2
#define CEC_NUM_EVENTS CEC_EVENT_PIN_HPD_HIGH
#define CEC_NUM_EVENTS CEC_EVENT_PIN_5V_HIGH
struct cec_fh {
struct list_head list;
@ -308,6 +308,16 @@ void cec_queue_pin_cec_event(struct cec_adapter *adap, bool is_high,
*/
void cec_queue_pin_hpd_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
/**
* cec_queue_pin_5v_event() - queue a pin event with a given timestamp.
*
* @adap: pointer to the cec adapter
* @is_high: when true the 5V pin is high, otherwise it is low
* @ts: the timestamp for this event
*
*/
void cec_queue_pin_5v_event(struct cec_adapter *adap, bool is_high, ktime_t ts);
/**
* cec_get_edid_phys_addr() - find and return the physical address
*