| Message ID | 1526388421-18808-2-git-send-email-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Neil, Two small comments below: On 05/15/18 14:46, 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. > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > drivers/media/cec/cec-notifier.c | 12 +++++++++--- > include/media/cec-notifier.h | 30 ++++++++++++++++++++++++++++-- > 2 files changed, 37 insertions(+), 5 deletions(-) > > diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c > index 16dffa0..7038abae1 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 +66,8 @@ static void cec_notifier_release(struct kref *kref) > container_of(kref, struct cec_notifier, kref); > > list_del(&n->head); > + if (n->conn) No need for this if, kfree already tests the pointer. > + kfree(n->conn); > kfree(n); > } > > diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h > index cf0add7..73f92c7 100644 > --- a/include/media/cec-notifier.h > +++ b/include/media/cec-notifier.h > @@ -20,6 +20,23 @@ struct cec_notifier; > #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER) > > /** > + * 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. > + * > + * 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. > + */ > +struct cec_notifier *cec_notifier_get_conn(struct device *dev, > + const char *conn); > + > +/** > * cec_notifier_get - find or create a new cec_notifier for the given device. > * @dev: device that sends the events. > * > @@ -31,7 +48,10 @@ struct cec_notifier; > * > * Return NULL if the memory could not be allocated. > */ > -struct cec_notifier *cec_notifier_get(struct device *dev); > +static inline struct cec_notifier *cec_notifier_get(struct device *dev) > +{ > + return cec_notifier_get_conn(dev, NULL); > +} > > /** > * cec_notifier_put - decrease refcount and delete when the refcount reaches 0. > @@ -85,12 +105,18 @@ 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; > } > > +static inline struct cec_notifier *cec_notifier_get(struct device *dev) > +{ > + return cec_notifier_get_conn(dev, NULL); > +} Just move this function to after the #if ... #else ... #endif After all, it is the same static inline for both. > + > static inline void cec_notifier_put(struct cec_notifier *n) > { > } > Regards, Hans
diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c index 16dffa0..7038abae1 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 +66,8 @@ static void cec_notifier_release(struct kref *kref) container_of(kref, struct cec_notifier, kref); list_del(&n->head); + if (n->conn) + kfree(n->conn); kfree(n); } diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h index cf0add7..73f92c7 100644 --- a/include/media/cec-notifier.h +++ b/include/media/cec-notifier.h @@ -20,6 +20,23 @@ struct cec_notifier; #if IS_REACHABLE(CONFIG_CEC_CORE) && IS_ENABLED(CONFIG_CEC_NOTIFIER) /** + * 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. + * + * 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. + */ +struct cec_notifier *cec_notifier_get_conn(struct device *dev, + const char *conn); + +/** * cec_notifier_get - find or create a new cec_notifier for the given device. * @dev: device that sends the events. * @@ -31,7 +48,10 @@ struct cec_notifier; * * Return NULL if the memory could not be allocated. */ -struct cec_notifier *cec_notifier_get(struct device *dev); +static inline struct cec_notifier *cec_notifier_get(struct device *dev) +{ + return cec_notifier_get_conn(dev, NULL); +} /** * cec_notifier_put - decrease refcount and delete when the refcount reaches 0. @@ -85,12 +105,18 @@ 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; } +static inline struct cec_notifier *cec_notifier_get(struct device *dev) +{ + return cec_notifier_get_conn(dev, NULL); +} + static inline void cec_notifier_put(struct cec_notifier *n) { }
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. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- drivers/media/cec/cec-notifier.c | 12 +++++++++--- include/media/cec-notifier.h | 30 ++++++++++++++++++++++++++++-- 2 files changed, 37 insertions(+), 5 deletions(-)