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authorHans Verkuil <hans.verkuil@cisco.com>2017-08-15 10:07:25 -0400
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-09-23 07:43:04 -0400
commit333ef6bd10c3ffdaf6da94e34dc6cae675ed27fc (patch)
tree0f01c42950d43741dcac85bb4a31397cd3fb5e56 /include/media
parentda634f623e4879d7716029a84791fc596ebac24d (diff)
downloadlinux-333ef6bd10c3ffdaf6da94e34dc6cae675ed27fc.tar.bz2
media: cec: add CEC_EVENT_PIN_HPD_LOW/HIGH events
Add support for two new low-level events: PIN_HPD_LOW and PIN_HPD_HIGH. This is specifically meant for use with the upcoming cec-gpio driver and makes it possible to trace when the HPD pin changes. Some HDMI sinks do strange things with the HPD and this makes it easy to debug this. Note that this also moves the initialization of a devnode mutex and list to the allocate_adapter function: if the HPD is high, then as soon as the HPD interrupt is created an interrupt occurs and cec_queue_pin_hpd_event() is called which requires that the devnode mutex and list are initialized. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/cec-pin.h4
-rw-r--r--include/media/cec.h12
2 files changed, 15 insertions, 1 deletions
diff --git a/include/media/cec-pin.h b/include/media/cec-pin.h
index f09cc9579d53..ea84b9c9e0c3 100644
--- a/include/media/cec-pin.h
+++ b/include/media/cec-pin.h
@@ -97,6 +97,9 @@ enum cec_pin_state {
* @free: optional. Free any allocated resources. Called when the
* adapter is deleted.
* @status: optional, log status information.
+ * @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.
*
* These operations are used by the cec pin framework to manipulate
* the CEC pin.
@@ -109,6 +112,7 @@ struct cec_pin_ops {
void (*disable_irq)(struct cec_adapter *adap);
void (*free)(struct cec_adapter *adap);
void (*status)(struct cec_adapter *adap, struct seq_file *file);
+ int (*read_hpd)(struct cec_adapter *adap);
};
#define CEC_NUM_PIN_EVENTS 128
diff --git a/include/media/cec.h b/include/media/cec.h
index df6b3bd31284..9d0f983faea9 100644
--- a/include/media/cec.h
+++ b/include/media/cec.h
@@ -91,7 +91,7 @@ struct cec_event_entry {
};
#define CEC_NUM_CORE_EVENTS 2
-#define CEC_NUM_EVENTS CEC_EVENT_PIN_CEC_HIGH
+#define CEC_NUM_EVENTS CEC_EVENT_PIN_HPD_HIGH
struct cec_fh {
struct list_head list;
@@ -297,6 +297,16 @@ 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