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typed componented support + i915/snd-hda changes

Browse Source 
This is needed by the new MEI-HDCP support in i915, so will need to go
 in through drm and drivers-misc trees at least.
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Merge tag 'topic/component-typed-2019-02-11' of git://anongit.freedesktop.org/drm/drm-intel into driver-core-next

Daniel writes:

typed componented support + i915/snd-hda changes

This is needed by the new MEI-HDCP support in i915, so will need to go
in through drm and drivers-misc trees at least.

* tag 'topic/component-typed-2019-02-11' of git://anongit.freedesktop.org/drm/drm-intel:
  i915/snd_hdac: I915 subcomponent for the snd_hdac
  components: multiple components for a device
  component: Add documentation
This commit is contained in:
Greg Kroah-Hartman 2019-02-11 20:32:31 +01:00
commit 4417967bf2
10 changed files with 308 additions and 18 deletions
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17
Documentation/driver-api/component.rst Normal file
View File

@ -0,0 +1,17 @@
======================================
Component Helper for Aggregate Drivers
======================================
.. kernel-doc:: drivers/base/component.c
:doc: overview
API
===
.. kernel-doc:: include/linux/component.h
:internal:
.. kernel-doc:: drivers/base/component.c
:export:

3
Documentation/driver-api/device_link.rst
View File

@ -1,6 +1,9 @@
.. |struct dev_pm_domain| replace:: :c:type:`struct dev_pm_domain <dev_pm_domain>`
.. |struct generic_pm_domain| replace:: :c:type:`struct generic_pm_domain <generic_pm_domain>`
.. _device_link:
============
Device links
============

1
Documentation/driver-api/index.rst
View File

@ -22,6 +22,7 @@ available subsections can be seen below.
device_connection
dma-buf
device_link
component
message-based
sound
frame-buffer

206
drivers/base/component.c
View File

@ -16,11 +16,38 @@
#include <linux/slab.h>
#include <linux/debugfs.h>
/**
* DOC: overview
*
* The component helper allows drivers to collect a pile of sub-devices,
* including their bound drivers, into an aggregate driver. Various subsystems
* already provide functions to get hold of such components, e.g.
* of_clk_get_by_name(). The component helper can be used when such a
* subsystem-specific way to find a device is not available: The component
* helper fills the niche of aggregate drivers for specific hardware, where
* further standardization into a subsystem would not be practical. The common
* example is when a logical device (e.g. a DRM display driver) is spread around
* the SoC on various component (scanout engines, blending blocks, transcoders
* for various outputs and so on).
*
* The component helper also doesn't solve runtime dependencies, e.g. for system
* suspend and resume operations. See also :ref:`device links<device_link>`.
*
* Components are registered using component_add() and unregistered with
* component_del(), usually from the driver's probe and disconnect functions.
*
* Aggregate drivers first assemble a component match list of what they need
* using component_match_add(). This is then registered as an aggregate driver
* using component_master_add_with_match(), and unregistered using
* component_master_del().
*/
struct component;
struct component_match_array {
void *data;
int (*compare)(struct device *, void *);
int (*compare_typed)(struct device *, int, void *);
void (*release)(struct device *, void *);
struct component *component;
bool duplicate;
@ -48,6 +75,7 @@ struct component {
bool bound;
const struct component_ops *ops;
int subcomponent;
struct device *dev;
};
@ -132,7 +160,7 @@ static struct master *__master_find(struct device *dev,
}
static struct component *find_component(struct master *master,
int (*compare)(struct device *, void *), void *compare_data)
struct component_match_array *mc)
{
struct component *c;
@ -140,7 +168,11 @@ static struct component *find_component(struct master *master,
if (c->master && c->master != master)
continue;
if (compare(c->dev, compare_data))
if (mc->compare && mc->compare(c->dev, mc->data))
return c;
if (mc->compare_typed &&
mc->compare_typed(c->dev, c->subcomponent, mc->data))
return c;
}
@ -166,7 +198,7 @@ static int find_components(struct master *master)
if (match->compare[i].component)
continue;
c = find_component(master, mc->compare, mc->data);
c = find_component(master, mc);
if (!c) {
ret = -ENXIO;
break;
@ -301,15 +333,12 @@ static int component_match_realloc(struct device *dev,
return 0;
}
/*
* Add a component to be matched, with a release function.
*
* The match array is first created or extended if necessary.
*/
void component_match_add_release(struct device *master,
static void __component_match_add(struct device *master,
struct component_match **matchptr,
void (*release)(struct device *, void *),
int (*compare)(struct device *, void *), void *compare_data)
int (*compare)(struct device *, void *),
int (*compare_typed)(struct device *, int, void *),
void *compare_data)
{
struct component_match *match = *matchptr;
@ -341,13 +370,69 @@ void component_match_add_release(struct device *master,
}
match->compare[match->num].compare = compare;
match->compare[match->num].compare_typed = compare_typed;
match->compare[match->num].release = release;
match->compare[match->num].data = compare_data;
match->compare[match->num].component = NULL;
match->num++;
}
/**
* component_match_add_release - add a component match with release callback
* @master: device with the aggregate driver
* @matchptr: pointer to the list of component matches
* @release: release function for @compare_data
* @compare: compare function to match against all components
* @compare_data: opaque pointer passed to the @compare function
*
* Adds a new component match to the list stored in @matchptr, which the @master
* aggregate driver needs to function. The list of component matches pointed to
* by @matchptr must be initialized to NULL before adding the first match. This
* only matches against components added with component_add().
*
* The allocated match list in @matchptr is automatically released using devm
* actions, where upon @release will be called to free any references held by
* @compare_data, e.g. when @compare_data is a &device_node that must be
* released with of_node_put().
*
* See also component_match_add() and component_match_add_typed().
*/
void component_match_add_release(struct device *master,
struct component_match **matchptr,
void (*release)(struct device *, void *),
int (*compare)(struct device *, void *), void *compare_data)
{
__component_match_add(master, matchptr, release, compare, NULL,
compare_data);
}
EXPORT_SYMBOL(component_match_add_release);
/**
* component_match_add_typed - add a compent match for a typed component
* @master: device with the aggregate driver
* @matchptr: pointer to the list of component matches
* @compare_typed: compare function to match against all typed components
* @compare_data: opaque pointer passed to the @compare function
*
* Adds a new component match to the list stored in @matchptr, which the @master
* aggregate driver needs to function. The list of component matches pointed to
* by @matchptr must be initialized to NULL before adding the first match. This
* only matches against components added with component_add_typed().
*
* The allocated match list in @matchptr is automatically released using devm
* actions.
*
* See also component_match_add_release() and component_match_add_typed().
*/
void component_match_add_typed(struct device *master,
struct component_match **matchptr,
int (*compare_typed)(struct device *, int, void *), void *compare_data)
{
__component_match_add(master, matchptr, NULL, NULL, compare_typed,
compare_data);
}
EXPORT_SYMBOL(component_match_add_typed);
static void free_master(struct master *master)
{
struct component_match *match = master->match;
@ -367,6 +452,18 @@ static void free_master(struct master *master)
kfree(master);
}
/**
* component_master_add_with_match - register an aggregate driver
* @dev: device with the aggregate driver
* @ops: callbacks for the aggregate driver
* @match: component match list for the aggregate driver
*
* Registers a new aggregate driver consisting of the components added to @match
* by calling one of the component_match_add() functions. Once all components in
* @match are available, it will be assembled by calling
* &component_master_ops.bind from @ops. Must be unregistered by calling
* component_master_del().
*/
int component_master_add_with_match(struct device *dev,
const struct component_master_ops *ops,
struct component_match *match)
@ -403,6 +500,15 @@ int component_master_add_with_match(struct device *dev,
}
EXPORT_SYMBOL_GPL(component_master_add_with_match);
/**
* component_master_del - unregister an aggregate driver
* @dev: device with the aggregate driver
* @ops: callbacks for the aggregate driver
*
* Unregisters an aggregate driver registered with
* component_master_add_with_match(). If necessary the aggregate driver is first
* disassembled by calling &component_master_ops.unbind from @ops.
*/
void component_master_del(struct device *dev,
const struct component_master_ops *ops)
{
@ -430,6 +536,15 @@ static void component_unbind(struct component *component,
devres_release_group(component->dev, component);
}
/**
* component_unbind_all - unbind all component to an aggregate driver
* @master_dev: device with the aggregate driver
* @data: opaque pointer, passed to all components
*
* Unbinds all components to the aggregate @dev by passing @data to their
* &component_ops.unbind functions. Should be called from
* &component_master_ops.unbind.
*/
void component_unbind_all(struct device *master_dev, void *data)
{
struct master *master;
@ -503,6 +618,15 @@ static int component_bind(struct component *component, struct master *master,
return ret;
}
/**
* component_bind_all - bind all component to an aggregate driver
* @master_dev: device with the aggregate driver
* @data: opaque pointer, passed to all components
*
* Binds all components to the aggregate @dev by passing @data to their
* &component_ops.bind functions. Should be called from
* &component_master_ops.bind.
*/
int component_bind_all(struct device *master_dev, void *data)
{
struct master *master;
@ -537,7 +661,8 @@ int component_bind_all(struct device *master_dev, void *data)
}
EXPORT_SYMBOL_GPL(component_bind_all);
int component_add(struct device *dev, const struct component_ops *ops)
static int __component_add(struct device *dev, const struct component_ops *ops,
int subcomponent)
{
struct component *component;
int ret;
@ -548,6 +673,7 @@ int component_add(struct device *dev, const struct component_ops *ops)
component->ops = ops;
component->dev = dev;
component->subcomponent = subcomponent;
dev_dbg(dev, "adding component (ops %ps)\n", ops);
@ -566,8 +692,66 @@ int component_add(struct device *dev, const struct component_ops *ops)
return ret < 0 ? ret : 0;
}
/**
* component_add_typed - register a component
* @dev: component device
* @ops: component callbacks
* @subcomponent: nonzero identifier for subcomponents
*
* Register a new component for @dev. Functions in @ops will be call when the
* aggregate driver is ready to bind the overall driver by calling
* component_bind_all(). See also &struct component_ops.
*
* @subcomponent must be nonzero and is used to differentiate between multiple
* components registerd on the same device @dev. These components are match
* using component_match_add_typed().
*
* The component needs to be unregistered at driver unload/disconnect by
* calling component_del().
*
* See also component_add().
*/
int component_add_typed(struct device *dev, const struct component_ops *ops,
int subcomponent)
{
if (WARN_ON(subcomponent == 0))
return -EINVAL;
return __component_add(dev, ops, subcomponent);
}
EXPORT_SYMBOL_GPL(component_add_typed);
/**
* component_add - register a component
* @dev: component device
* @ops: component callbacks
*
* Register a new component for @dev. Functions in @ops will be called when the
* aggregate driver is ready to bind the overall driver by calling
* component_bind_all(). See also &struct component_ops.
*
* The component needs to be unregistered at driver unload/disconnect by
* calling component_del().
*
* See also component_add_typed() for a variant that allows multipled different
* components on the same device.
*/
int component_add(struct device *dev, const struct component_ops *ops)
{
return __component_add(dev, ops, 0);
}
EXPORT_SYMBOL_GPL(component_add);
/**
* component_del - unregister a component
* @dev: component device
* @ops: component callbacks
*
* Unregister a component added with component_add(). If the component is bound
* into an aggregate driver, this will force the entire aggregate driver, including
* all its components, to be unbound.
*/
void component_del(struct device *dev, const struct component_ops *ops)
{
struct component *c, *component = NULL;

4
drivers/gpu/drm/i915/intel_audio.c
View File

@ -984,7 +984,9 @@ void i915_audio_component_init(struct drm_i915_private *dev_priv)
{
int ret;
ret = component_add(dev_priv->drm.dev, &i915_audio_component_bind_ops);
ret = component_add_typed(dev_priv->drm.dev,
&i915_audio_component_bind_ops,
I915_COMPONENT_AUDIO);
if (ret < 0) {
DRM_ERROR("failed to add audio component (%d)\n", ret);
/* continue with reduced functionality */

4
include/drm/i915_component.h
View File

@ -26,6 +26,10 @@
#include "drm_audio_component.h"
enum i915_component_type {
I915_COMPONENT_AUDIO = 1,
};
/* MAX_PORT is the number of port
* It must be sync with I915_MAX_PORTS defined i915_drv.h
*/

76
include/linux/component.h
View File

@ -4,16 +4,38 @@
#include <linux/stddef.h>
struct device;
/**
* struct component_ops - callbacks for component drivers
*
* Components are registered with component_add() and unregistered with
* component_del().
*/
struct component_ops {
/**
* @bind:
*
* Called through component_bind_all() when the aggregate driver is
* ready to bind the overall driver.
*/
int (*bind)(struct device *comp, struct device *master,
void *master_data);
/**
* @unbind:
*
* Called through component_unbind_all() when the aggregate driver is
* ready to bind the overall driver, or when component_bind_all() fails
* part-ways through and needs to unbind some already bound components.
*/
void (*unbind)(struct device *comp, struct device *master,
void *master_data);
};
int component_add(struct device *, const struct component_ops *);
int component_add_typed(struct device *dev, const struct component_ops *ops,
int subcomponent);
void component_del(struct device *, const struct component_ops *);
int component_bind_all(struct device *master, void *master_data);
@ -21,8 +43,42 @@ void component_unbind_all(struct device *master, void *master_data);
struct master;
/**
* struct component_master_ops - callback for the aggregate driver
*
* Aggregate drivers are registered with component_master_add_with_match() and
* unregistered with component_master_del().
*/
struct component_master_ops {
/**
* @bind:
*
* Called when all components or the aggregate driver, as specified in
* the match list passed to component_master_add_with_match(), are
* ready. Usually there are 3 steps to bind an aggregate driver:
*
* 1. Allocate a structure for the aggregate driver.
*
* 2. Bind all components to the aggregate driver by calling
* component_bind_all() with the aggregate driver structure as opaque
* pointer data.
*
* 3. Register the aggregate driver with the subsystem to publish its
* interfaces.
*
* Note that the lifetime of the aggregate driver does not align with
* any of the underlying &struct device instances. Therefore devm cannot
* be used and all resources acquired or allocated in this callback must
* be explicitly released in the @unbind callback.
*/
int (*bind)(struct device *master);
/**
* @unbind:
*
* Called when either the aggregate driver, using
* component_master_del(), or one of its components, using
* component_del(), is unregistered.
*/
void (*unbind)(struct device *master);
};
@ -37,7 +93,27 @@ void component_match_add_release(struct device *master,
struct component_match **matchptr,
void (*release)(struct device *, void *),
int (*compare)(struct device *, void *), void *compare_data);
void component_match_add_typed(struct device *master,
struct component_match **matchptr,
int (*compare_typed)(struct device *, int, void *), void *compare_data);
/**
* component_match_add - add a compent match
* @master: device with the aggregate driver
* @matchptr: pointer to the list of component matches
* @compare: compare function to match against all components
* @compare_data: opaque pointer passed to the @compare function
*
* Adds a new component match to the list stored in @matchptr, which the @master
* aggregate driver needs to function. The list of component matches pointed to
* by @matchptr must be initialized to NULL before adding the first match. This
* only matches against components added with component_add().
*
* The allocated match list in @matchptr is automatically released using devm
* actions.
*
* See also component_match_add_release() and component_match_add_typed().
*/
static inline void component_match_add(struct device *master,
struct component_match **matchptr,
int (*compare)(struct device *, void *), void *compare_data)

5
include/sound/hda_component.h
View File

@ -20,7 +20,7 @@ int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
bool *audio_enabled, char *buffer, int max_bytes);
int snd_hdac_acomp_init(struct hdac_bus *bus,
const struct drm_audio_component_audio_ops *aops,
int (*match_master)(struct device *, void *),
int (*match_master)(struct device *, int, void *),
size_t extra_size);
int snd_hdac_acomp_exit(struct hdac_bus *bus);
int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
@ -47,7 +47,8 @@ static inline int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t ni
}
static inline int snd_hdac_acomp_init(struct hdac_bus *bus,
const struct drm_audio_component_audio_ops *aops,
int (*match_master)(struct device *, void *),
int (*match_master)(struct device *,
int, void *),
size_t extra_size)
{
return -ENODEV;

4
sound/hda/hdac_component.c
View File

@ -269,7 +269,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);
*/
int snd_hdac_acomp_init(struct hdac_bus *bus,
const struct drm_audio_component_audio_ops *aops,
int (*match_master)(struct device *, void *),
int (*match_master)(struct device *, int, void *),
size_t extra_size)
{
struct component_match *match = NULL;
@ -288,7 +288,7 @@ int snd_hdac_acomp_init(struct hdac_bus *bus,
bus->audio_component = acomp;
devres_add(dev, acomp);
component_match_add(dev, &match, match_master, bus);
component_match_add_typed(dev, &match, match_master, bus);
ret = component_master_add_with_match(dev, &hdac_component_master_ops,
match);
if (ret < 0)

6
sound/hda/hdac_i915.c
View File

@ -82,9 +82,11 @@ void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
static int i915_component_master_match(struct device *dev, void *data)
static int i915_component_master_match(struct device *dev, int subcomponent,
void *data)
{
return !strcmp(dev->driver->name, "i915");
return !strcmp(dev->driver->name, "i915") &&
subcomponent == I915_COMPONENT_AUDIO;
}
/* check whether intel graphics is present */