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-rw-r--r--drivers/base/component.c206
1 files changed, 195 insertions, 11 deletions
diff --git a/drivers/base/component.c b/drivers/base/component.c
index ddcea8739c12..532a3a5d8f63 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -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 components (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 entry 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 component match entry 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 components of an aggregate driver
+ * @master_dev: device with the aggregate driver
+ * @data: opaque pointer, passed to all components
+ *
+ * Unbinds all components of 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 components of an aggregate driver
+ * @master_dev: device with the aggregate driver
+ * @data: opaque pointer, passed to all components
+ *
+ * Binds all components of 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;