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Date: Tue, 15 May 2018 17:22:54 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Neil Armstrong <narmstrong@...libre.com>, airlied@...ux.ie,
hans.verkuil@...co.com, lee.jones@...aro.org, olof@...om.net,
seanpaul@...gle.com
Cc: sadolfsson@...gle.com, felixe@...gle.com, bleung@...gle.com,
darekm@...gle.com, marcheu@...omium.org, fparent@...libre.com,
dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] media: cec-notifier: Get notifier by device and
connector name
On 05/15/2018 04:42 PM, Neil Armstrong wrote:
> In non device-tree world, we can need to get the notifier by the driver
> name directly and eventually defer probe if not yet created.
>
> This patch adds a variant of the get function by using the device name
> instead and will not create a notifier if not yet created.
>
> But the i915 driver exposes at least 2 HDMI connectors, this patch also
> adds the possibility to add a connector name tied to the notifier device
> to form a tuple and associate different CEC controllers for each HDMI
> connectors.
The patch looks good, but I'm curious about this paragraph above.
Was this tested with devices with more than one HDMI output? Or only on
laptops with a single physical HDMI output? If there are two or more
outputs then I guess it is the HW designer that decides with output gets
CEC support?
Regards,
Hans
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
> drivers/media/cec/cec-notifier.c | 11 ++++++++---
> include/media/cec-notifier.h | 27 ++++++++++++++++++++++++---
> 2 files changed, 32 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
> index 16dffa0..dd2078b 100644
> --- a/drivers/media/cec/cec-notifier.c
> +++ b/drivers/media/cec/cec-notifier.c
> @@ -21,6 +21,7 @@ struct cec_notifier {
> struct list_head head;
> struct kref kref;
> struct device *dev;
> + const char *conn;
> struct cec_adapter *cec_adap;
> void (*callback)(struct cec_adapter *adap, u16 pa);
>
> @@ -30,13 +31,14 @@ struct cec_notifier {
> static LIST_HEAD(cec_notifiers);
> static DEFINE_MUTEX(cec_notifiers_lock);
>
> -struct cec_notifier *cec_notifier_get(struct device *dev)
> +struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
> {
> struct cec_notifier *n;
>
> mutex_lock(&cec_notifiers_lock);
> list_for_each_entry(n, &cec_notifiers, head) {
> - if (n->dev == dev) {
> + if (n->dev == dev &&
> + (!conn || !strcmp(n->conn, conn))) {
> kref_get(&n->kref);
> mutex_unlock(&cec_notifiers_lock);
> return n;
> @@ -46,6 +48,8 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
> if (!n)
> goto unlock;
> n->dev = dev;
> + if (conn)
> + n->conn = kstrdup(conn, GFP_KERNEL);
> n->phys_addr = CEC_PHYS_ADDR_INVALID;
> mutex_init(&n->lock);
> kref_init(&n->kref);
> @@ -54,7 +58,7 @@ struct cec_notifier *cec_notifier_get(struct device *dev)
> mutex_unlock(&cec_notifiers_lock);
> return n;
> }
> -EXPORT_SYMBOL_GPL(cec_notifier_get);
> +EXPORT_SYMBOL_GPL(cec_notifier_get_conn);
>
> static void cec_notifier_release(struct kref *kref)
> {
> @@ -62,6 +66,7 @@ static void cec_notifier_release(struct kref *kref)
> container_of(kref, struct cec_notifier, kref);
>
> list_del(&n->head);
> + kfree(n->conn);
> kfree(n);
> }
>
> diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
> index cf0add7..814eeef 100644
> --- a/include/media/cec-notifier.h
> +++ b/include/media/cec-notifier.h
> @@ -20,8 +20,10 @@ struct cec_notifier;
> #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER)
>
> /**
> - * cec_notifier_get - find or create a new cec_notifier for the given device.
> + * cec_notifier_get_conn - find or create a new cec_notifier for the given
> + * device and connector tuple.
> * @dev: device that sends the events.
> + * @conn: the connector name from which the event occurs
> *
> * If a notifier for device @dev already exists, then increase the refcount
> * and return that notifier.
> @@ -31,7 +33,8 @@ struct cec_notifier;
> *
> * Return NULL if the memory could not be allocated.
> */
> -struct cec_notifier *cec_notifier_get(struct device *dev);
> +struct cec_notifier *cec_notifier_get_conn(struct device *dev,
> + const char *conn);
>
> /**
> * cec_notifier_put - decrease refcount and delete when the refcount reaches 0.
> @@ -85,7 +88,8 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
> struct cec_notifier *notifier);
>
> #else
> -static inline struct cec_notifier *cec_notifier_get(struct device *dev)
> +static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,
> + const char *conn)
> {
> /* A non-NULL pointer is expected on success */
> return (struct cec_notifier *)0xdeadfeed;
> @@ -121,6 +125,23 @@ static inline void cec_register_cec_notifier(struct cec_adapter *adap,
> #endif
>
> /**
> + * cec_notifier_get - find or create a new cec_notifier for the given device.
> + * @dev: device that sends the events.
> + *
> + * If a notifier for device @dev already exists, then increase the refcount
> + * and return that notifier.
> + *
> + * If it doesn't exist, then allocate a new notifier struct and return a
> + * pointer to that new struct.
> + *
> + * Return NULL if the memory could not be allocated.
> + */
> +static inline struct cec_notifier *cec_notifier_get(struct device *dev)
> +{
> + return cec_notifier_get_conn(dev, NULL);
> +}
> +
> +/**
> * cec_notifier_phys_addr_invalidate() - set the physical address to INVALID
> *
> * @n: the CEC notifier
>
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