On Mon, Jun 3, 2019 at 3:46 PM Hans Verkuil <hverkuil@xxxxxxxxx> wrote: > > On 6/3/19 6:32 AM, Cheng-Yi Chiang wrote: > > From: Hans Verkuil <hans.verkuil@xxxxxxxxx> > > > > Add support for HDMI hotplug and EDID notifiers, which is used to convey > > information from HDMI drivers to their CEC and audio counterparts. > > > > Based on an earlier version from Russell King: > > > > https://patchwork.kernel.org/patch/9277043/ > > > > The hdmi_notifier is a reference counted object containing the HDMI state > > of an HDMI device. > > > > When a new notifier is registered the current state will be reported to > > that notifier at registration time. > > > > Based on Hans Verkuil's patch: > > > > https://patchwork.kernel.org/patch/9472521/ > > Erm, you are aware that this patch morphed into a CEC-specific notifier > found in drivers/media/cec/cec-notifier.c? > > I don't think it makes sense to have two notifier implementations in the kernel. > The original intention was to have the notifier deal with both CEC and ASoC > notifications, but there was not enough interest for the ASoC bits at the time > and it was dropped. > > I am planning changes to the cec-notifier API, I hope to work on that this > week. I'll CC you when I post those. Those might be a good starting point > to convert the cec-notifier to an hdmi-notifier as was originally intended. > > I've added your colleague Dariusz Marcinkiewicz to the CC list since he's been > working on some nice cec-notifier improvements as well. Hi Hans, thank you for quick reply. I am not aware of the history of cec-notifier and hdmi-notifier. The reason I took this patch is because its different versions were used extensively in rockchip tree and chromium tree for years. And hdmi-notifier patch posted at https://patchwork.kernel.org/patch/9472521/ did not get objection at that time. If you think jack reporting should be supported on cec-notifier instead, I can look into it after you post the new changes on cec-notifier. Thanks! > > Regards, > > Hans > > > > > Modified by Cheng-Yi Chiang: > > - Add a section in MAINTAINER. > > - Changes connected and has_eld to bitfield of unsigned int. > > - Other minor fixes to pass checkpatch.pl --strict checks. > > > > Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> > > Acked-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> > > Signed-off-by: Cheng-Yi Chiang <cychiang@xxxxxxxxxxxx> > > --- > > The original patch is at > > https://lore.kernel.org/linux-arm-kernel/20161213150813.37966-2-hverkuil@xxxxxxxxx > > > > MAINTAINERS | 6 ++ > > drivers/video/Kconfig | 3 + > > drivers/video/Makefile | 1 + > > drivers/video/hdmi-notifier.c | 145 ++++++++++++++++++++++++++++++++++ > > include/linux/hdmi-notifier.h | 112 ++++++++++++++++++++++++++ > > 5 files changed, 267 insertions(+) > > create mode 100644 drivers/video/hdmi-notifier.c > > create mode 100644 include/linux/hdmi-notifier.h > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 5cfbea4ce575..ffb7376f9509 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -16676,6 +16676,12 @@ W: https://linuxtv.org > > S: Maintained > > F: drivers/media/platform/vicodec/* > > > > +VIDEO FRAMEWORK > > +M: Hans Verkuil <hverkuil@xxxxxxxxx> > > +L: linux-media@xxxxxxxxxxxxxxx > > +F: drivers/video/hdmi-notifier.* > > +S: Maintained > > + > > VIDEO MULTIPLEXER DRIVER > > M: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> > > L: linux-media@xxxxxxxxxxxxxxx > > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig > > index 83d3d271ca15..000ba9bc0ae7 100644 > > --- a/drivers/video/Kconfig > > +++ b/drivers/video/Kconfig > > @@ -34,6 +34,9 @@ config VIDEOMODE_HELPERS > > config HDMI > > bool > > > > +config HDMI_NOTIFIERS > > + bool > > + > > endif # HAS_IOMEM > > > > if VT > > diff --git a/drivers/video/Makefile b/drivers/video/Makefile > > index df7650adede9..eff4736102ca 100644 > > --- a/drivers/video/Makefile > > +++ b/drivers/video/Makefile > > @@ -1,6 +1,7 @@ > > # SPDX-License-Identifier: GPL-2.0 > > obj-$(CONFIG_VGASTATE) += vgastate.o > > obj-$(CONFIG_HDMI) += hdmi.o > > +obj-$(CONFIG_HDMI_NOTIFIERS) += hdmi-notifier.o > > > > obj-$(CONFIG_VT) += console/ > > obj-$(CONFIG_FB_STI) += console/ > > diff --git a/drivers/video/hdmi-notifier.c b/drivers/video/hdmi-notifier.c > > new file mode 100644 > > index 000000000000..d1eedf661648 > > --- /dev/null > > +++ b/drivers/video/hdmi-notifier.c > > @@ -0,0 +1,145 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* hdmi-notifier.c - notify interested parties of (dis)connect and EDID > > + * events > > + * > > + * Copyright 2016 Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > > + * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. > > + * All rights reserved. > > + */ > > + > > +#include <linux/export.h> > > +#include <linux/hdmi-notifier.h> > > +#include <linux/string.h> > > +#include <linux/slab.h> > > +#include <linux/list.h> > > + > > +static LIST_HEAD(hdmi_notifiers); > > +static DEFINE_MUTEX(hdmi_notifiers_lock); > > + > > +struct hdmi_notifier *hdmi_notifier_get(struct device *dev) > > +{ > > + struct hdmi_notifier *n; > > + > > + mutex_lock(&hdmi_notifiers_lock); > > + list_for_each_entry(n, &hdmi_notifiers, head) { > > + if (n->dev == dev) { > > + mutex_unlock(&hdmi_notifiers_lock); > > + kref_get(&n->kref); > > + return n; > > + } > > + } > > + n = kzalloc(sizeof(*n), GFP_KERNEL); > > + if (!n) > > + goto unlock; > > + n->dev = dev; > > + mutex_init(&n->lock); > > + BLOCKING_INIT_NOTIFIER_HEAD(&n->notifiers); > > + kref_init(&n->kref); > > + list_add_tail(&n->head, &hdmi_notifiers); > > +unlock: > > + mutex_unlock(&hdmi_notifiers_lock); > > + return n; > > +} > > +EXPORT_SYMBOL_GPL(hdmi_notifier_get); > > + > > +static void hdmi_notifier_release(struct kref *kref) > > +{ > > + struct hdmi_notifier *n = > > + container_of(kref, struct hdmi_notifier, kref); > > + > > + mutex_lock(&hdmi_notifiers_lock); > > + list_del(&n->head); > > + mutex_unlock(&hdmi_notifiers_lock); > > + kfree(n->edid); > > + kfree(n); > > +} > > + > > +void hdmi_notifier_put(struct hdmi_notifier *n) > > +{ > > + kref_put(&n->kref, hdmi_notifier_release); > > +} > > +EXPORT_SYMBOL_GPL(hdmi_notifier_put); > > + > > +int hdmi_notifier_register(struct hdmi_notifier *n, struct notifier_block *nb) > > +{ > > + int ret = blocking_notifier_chain_register(&n->notifiers, nb); > > + > > + if (ret) > > + return ret; > > + kref_get(&n->kref); > > + mutex_lock(&n->lock); > > + if (n->connected) { > > + blocking_notifier_call_chain(&n->notifiers, HDMI_CONNECTED, n); > > + if (n->edid_size) > > + blocking_notifier_call_chain(&n->notifiers, > > + HDMI_NEW_EDID, n); > > + if (n->has_eld) > > + blocking_notifier_call_chain(&n->notifiers, > > + HDMI_NEW_ELD, n); > > + } > > + mutex_unlock(&n->lock); > > + return 0; > > +} > > +EXPORT_SYMBOL_GPL(hdmi_notifier_register); > > + > > +int hdmi_notifier_unregister(struct hdmi_notifier *n, struct notifier_block *nb) > > +{ > > + int ret = blocking_notifier_chain_unregister(&n->notifiers, nb); > > + > > + if (ret == 0) > > + hdmi_notifier_put(n); > > + return ret; > > +} > > +EXPORT_SYMBOL_GPL(hdmi_notifier_unregister); > > + > > +void hdmi_event_connect(struct hdmi_notifier *n) > > +{ > > + mutex_lock(&n->lock); > > + n->connected = true; > > + blocking_notifier_call_chain(&n->notifiers, HDMI_CONNECTED, n); > > + mutex_unlock(&n->lock); > > +} > > +EXPORT_SYMBOL_GPL(hdmi_event_connect); > > + > > +void hdmi_event_disconnect(struct hdmi_notifier *n) > > +{ > > + mutex_lock(&n->lock); > > + n->connected = false; > > + n->has_eld = false; > > + n->edid_size = 0; > > + blocking_notifier_call_chain(&n->notifiers, HDMI_DISCONNECTED, n); > > + mutex_unlock(&n->lock); > > +} > > +EXPORT_SYMBOL_GPL(hdmi_event_disconnect); > > + > > +int hdmi_event_new_edid(struct hdmi_notifier *n, const void *edid, size_t size) > > +{ > > + mutex_lock(&n->lock); > > + if (n->edid_allocated_size < size) { > > + void *p = kmalloc(size, GFP_KERNEL); > > + > > + if (!p) { > > + mutex_unlock(&n->lock); > > + return -ENOMEM; > > + } > > + kfree(n->edid); > > + n->edid = p; > > + n->edid_allocated_size = size; > > + } > > + memcpy(n->edid, edid, size); > > + n->edid_size = size; > > + blocking_notifier_call_chain(&n->notifiers, HDMI_NEW_EDID, n); > > + mutex_unlock(&n->lock); > > + return 0; > > +} > > +EXPORT_SYMBOL_GPL(hdmi_event_new_edid); > > + > > +void hdmi_event_new_eld(struct hdmi_notifier *n, const u8 eld[128]) > > +{ > > + mutex_lock(&n->lock); > > + memcpy(n->eld, eld, sizeof(n->eld)); > > + n->has_eld = true; > > + blocking_notifier_call_chain(&n->notifiers, HDMI_NEW_ELD, n); > > + mutex_unlock(&n->lock); > > +} > > +EXPORT_SYMBOL_GPL(hdmi_event_new_eld); > > diff --git a/include/linux/hdmi-notifier.h b/include/linux/hdmi-notifier.h > > new file mode 100644 > > index 000000000000..c8f35110e3e3 > > --- /dev/null > > +++ b/include/linux/hdmi-notifier.h > > @@ -0,0 +1,112 @@ > > +/* SPDX-License-Identifier: GPL-2.0 > > + * hdmi-notifier.h - notify interested parties of (dis)connect and EDID > > + * events > > + * > > + * Copyright 2016 Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> > > + * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. > > + * All rights reserved. > > + */ > > + > > +#ifndef LINUX_HDMI_NOTIFIER_H > > +#define LINUX_HDMI_NOTIFIER_H > > + > > +#include <linux/types.h> > > +#include <linux/notifier.h> > > +#include <linux/kref.h> > > + > > +enum { > > + HDMI_CONNECTED, > > + HDMI_DISCONNECTED, > > + HDMI_NEW_EDID, > > + HDMI_NEW_ELD, > > +}; > > + > > +struct device; > > + > > +struct hdmi_notifier { > > + /* Lock to protect callback registration and notification. */ > > + struct mutex lock; > > + struct list_head head; > > + struct kref kref; > > + struct blocking_notifier_head notifiers; > > + struct device *dev; > > + > > + /* Current state */ > > + unsigned int connected : 1; > > + unsigned int has_eld : 1; > > + unsigned char eld[128]; > > + void *edid; > > + size_t edid_size; > > + size_t edid_allocated_size; > > +}; > > + > > +/** > > + * hdmi_notifier_get - find or create a new hdmi_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. > > + */ > > +struct hdmi_notifier *hdmi_notifier_get(struct device *dev); > > + > > +/** > > + * hdmi_notifier_put - decrease refcount and delete when the refcount reaches 0. > > + * @n: notifier > > + */ > > +void hdmi_notifier_put(struct hdmi_notifier *n); > > + > > +/** > > + * hdmi_notifier_register - register the notifier with the notifier_block. > > + * @n: the HDMI notifier > > + * @nb: the notifier_block > > + */ > > +int hdmi_notifier_register(struct hdmi_notifier *n, struct notifier_block *nb); > > + > > +/** > > + * hdmi_notifier_unregister - unregister the notifier with the notifier_block. > > + * @n: the HDMI notifier > > + * @nb: the notifier_block > > + */ > > +int hdmi_notifier_unregister(struct hdmi_notifier *n, > > + struct notifier_block *nb); > > + > > +/** > > + * hdmi_event_connect - send a connect event. > > + * @n: the HDMI notifier > > + * > > + * Send an HDMI_CONNECTED event to any registered parties. > > + */ > > +void hdmi_event_connect(struct hdmi_notifier *n); > > + > > +/** > > + * hdmi_event_disconnect - send a disconnect event. > > + * @n: the HDMI notifier > > + * > > + * Send an HDMI_DISCONNECTED event to any registered parties. > > + */ > > +void hdmi_event_disconnect(struct hdmi_notifier *n); > > + > > +/** > > + * hdmi_event_new_edid - send a new EDID event. > > + * @n: the HDMI notifier > > + * > > + * Send an HDMI_NEW_EDID event to any registered parties. > > + * This function will make a copy the EDID so it can return -ENOMEM if > > + * no memory could be allocated. > > + */ > > +int hdmi_event_new_edid(struct hdmi_notifier *n, const void *edid, size_t size); > > + > > +/** > > + * hdmi_event_new_eld - send a new ELD event. > > + * @n: the HDMI notifier > > + * > > + * Send an HDMI_NEW_ELD event to any registered parties. > > + */ > > +void hdmi_event_new_eld(struct hdmi_notifier *n, const u8 eld[128]); > > + > > +#endif > > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
