Release 4.11 drivers/base/component.c
/*
* Componentized device handling.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This is work in progress. We gather up the component devices into a list,
* and bind them when instructed. At the moment, we're specific to the DRM
* subsystem, and only handles one master device, but this doesn't have to be
* the case.
*/
#include <linux/component.h>
#include <linux/device.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
struct component;
struct component_match_array {
void *data;
int (*compare)(struct device *, void *);
void (*release)(struct device *, void *);
struct component *component;
bool duplicate;
};
struct component_match {
size_t alloc;
size_t num;
struct component_match_array *compare;
};
struct master {
struct list_head node;
bool bound;
const struct component_master_ops *ops;
struct device *dev;
struct component_match *match;
};
struct component {
struct list_head node;
struct master *master;
bool bound;
const struct component_ops *ops;
struct device *dev;
};
static DEFINE_MUTEX(component_mutex);
static LIST_HEAD(component_list);
static LIST_HEAD(masters);
static struct master *__master_find(struct device *dev,
const struct component_master_ops *ops)
{
struct master *m;
list_for_each_entry(m, &masters, node)
if (m->dev == dev && (!ops || m->ops == ops))
return m;
return NULL;
}
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static struct component *find_component(struct master *master,
int (*compare)(struct device *, void *), void *compare_data)
{
struct component *c;
list_for_each_entry(c, &component_list, node) {
if (c->master && c->master != master)
continue;
if (compare(c->dev, compare_data))
return c;
}
return NULL;
}
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static int find_components(struct master *master)
{
struct component_match *match = master->match;
size_t i;
int ret = 0;
/*
* Scan the array of match functions and attach
* any components which are found to this master.
*/
for (i = 0; i < match->num; i++) {
struct component_match_array *mc = &match->compare[i];
struct component *c;
dev_dbg(master->dev, "Looking for component %zu\n", i);
if (match->compare[i].component)
continue;
c = find_component(master, mc->compare, mc->data);
if (!c) {
ret = -ENXIO;
break;
}
dev_dbg(master->dev, "found component %s, duplicate %u\n", dev_name(c->dev), !!c->master);
/* Attach this component to the master */
match->compare[i].duplicate = !!c->master;
match->compare[i].component = c;
c->master = master;
}
return ret;
}
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/* Detach component from associated master */
static void remove_component(struct master *master, struct component *c)
{
size_t i;
/* Detach the component from this master. */
for (i = 0; i < master->match->num; i++)
if (master->match->compare[i].component == c)
master->match->compare[i].component = NULL;
}
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/*
* Try to bring up a master. If component is NULL, we're interested in
* this master, otherwise it's a component which must be present to try
* and bring up the master.
*
* Returns 1 for successful bringup, 0 if not ready, or -ve errno.
*/
static int try_to_bring_up_master(struct master *master,
struct component *component)
{
int ret;
dev_dbg(master->dev, "trying to bring up master\n");
if (find_components(master)) {
dev_dbg(master->dev, "master has incomplete components\n");
return 0;
}
if (component && component->master != master) {
dev_dbg(master->dev, "master is not for this component (%s)\n",
dev_name(component->dev));
return 0;
}
if (!devres_open_group(master->dev, NULL, GFP_KERNEL))
return -ENOMEM;
/* Found all components */
ret = master->ops->bind(master->dev);
if (ret < 0) {
devres_release_group(master->dev, NULL);
dev_info(master->dev, "master bind failed: %d\n", ret);
return ret;
}
master->bound = true;
return 1;
}
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static int try_to_bring_up_masters(struct component *component)
{
struct master *m;
int ret = 0;
list_for_each_entry(m, &masters, node) {
if (!m->bound) {
ret = try_to_bring_up_master(m, component);
if (ret != 0)
break;
}
}
return ret;
}
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static void take_down_master(struct master *master)
{
if (master->bound) {
master->ops->unbind(master->dev);
devres_release_group(master->dev, NULL);
master->bound = false;
}
}
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static void component_match_release(struct device *master,
struct component_match *match)
{
unsigned int i;
for (i = 0; i < match->num; i++) {
struct component_match_array *mc = &match->compare[i];
if (mc->release)
mc->release(master, mc->data);
}
kfree(match->compare);
}
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static void devm_component_match_release(struct device *dev, void *res)
{
component_match_release(dev, res);
}
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static int component_match_realloc(struct device *dev,
struct component_match *match, size_t num)
{
struct component_match_array *new;
if (match->alloc == num)
return 0;
new = kmalloc_array(num, sizeof(*new), GFP_KERNEL);
if (!new)
return -ENOMEM;
if (match->compare) {
memcpy(new, match->compare, sizeof(*new) *
min(match->num, num));
kfree(match->compare);
}
match->compare = new;
match->alloc = num;
return 0;
}
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/*
* 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,
struct component_match **matchptr,
void (*release)(struct device *, void *),
int (*compare)(struct device *, void *), void *compare_data)
{
struct component_match *match = *matchptr;
if (IS_ERR(match))
return;
if (!match) {
match = devres_alloc(devm_component_match_release,
sizeof(*match), GFP_KERNEL);
if (!match) {
*matchptr = ERR_PTR(-ENOMEM);
return;
}
devres_add(master, match);
*matchptr = match;
}
if (match->num == match->alloc) {
size_t new_size = match->alloc + 16;
int ret;
ret = component_match_realloc(master, match, new_size);
if (ret) {
*matchptr = ERR_PTR(ret);
return;
}
}
match->compare[match->num].compare = compare;
match->compare[match->num].release = release;
match->compare[match->num].data = compare_data;
match->compare[match->num].component = NULL;
match->num++;
}
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EXPORT_SYMBOL(component_match_add_release);
static void free_master(struct master *master)
{
struct component_match *match = master->match;
int i;
list_del(&master->node);
if (match) {
for (i = 0; i < match->num; i++) {
struct component *c = match->compare[i].component;
if (c)
c->master = NULL;
}
}
kfree(master);
}
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int component_master_add_with_match(struct device *dev,
const struct component_master_ops *ops,
struct component_match *match)
{
struct master *master;
int ret;
/* Reallocate the match array for its true size */
ret = component_match_realloc(dev, match, match->num);
if (ret)
return ret;
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return -ENOMEM;
master->dev = dev;
master->ops = ops;
master->match = match;
/* Add to the list of available masters. */
mutex_lock(&component_mutex);
list_add(&master->node, &masters);
ret = try_to_bring_up_master(master, NULL);
if (ret < 0)
free_master(master);
mutex_unlock(&component_mutex);
return ret < 0 ? ret : 0;
}
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| Total | 143 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(component_master_add_with_match);
void component_master_del(struct device *dev,
const struct component_master_ops *ops)
{
struct master *master;
mutex_lock(&component_mutex);
master = __master_find(dev, ops);
if (master) {
take_down_master(master);
free_master(master);
}
mutex_unlock(&component_mutex);
}
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EXPORT_SYMBOL_GPL(component_master_del);
static void component_unbind(struct component *component,
struct master *master, void *data)
{
WARN_ON(!component->bound);
component->ops->unbind(component->dev, master->dev, data);
component->bound = false;
/* Release all resources claimed in the binding of this component */
devres_release_group(component->dev, component);
}
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void component_unbind_all(struct device *master_dev, void *data)
{
struct master *master;
struct component *c;
size_t i;
WARN_ON(!mutex_is_locked(&component_mutex));
master = __master_find(master_dev, NULL);
if (!master)
return;
/* Unbind components in reverse order */
for (i = master->match->num; i--; )
if (!master->match->compare[i].duplicate) {
c = master->match->compare[i].component;
component_unbind(c, master, data);
}
}
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EXPORT_SYMBOL_GPL(component_unbind_all);
static int component_bind(struct component *component, struct master *master,
void *data)
{
int ret;
/*
* Each component initialises inside its own devres group.
* This allows us to roll-back a failed component without
* affecting anything else.
*/
if (!devres_open_group(master->dev, NULL, GFP_KERNEL))
return -ENOMEM;
/*
* Also open a group for the device itself: this allows us
* to release the resources claimed against the sub-device
* at the appropriate moment.
*/
if (!devres_open_group(component->dev, component, GFP_KERNEL)) {
devres_release_group(master->dev, NULL);
return -ENOMEM;
}
dev_dbg(master->dev, "binding %s (ops %ps)\n",
dev_name(component->dev), component->ops);
ret = component->ops->bind(component->dev, master->dev, data);
if (!ret) {
component->bound = true;
/*
* Close the component device's group so that resources
* allocated in the binding are encapsulated for removal
* at unbind. Remove the group on the DRM device as we
* can clean those resources up independently.
*/
devres_close_group(component->dev, NULL);
devres_remove_group(master->dev, NULL);
dev_info(master->dev, "bound %s (ops %ps)\n",
dev_name(component->dev), component->ops);
} else {
devres_release_group(component->dev, NULL);
devres_release_group(master->dev, NULL);
dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
dev_name(component->dev), component->ops, ret);
}
return ret;
}
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int component_bind_all(struct device *master_dev, void *data)
{
struct master *master;
struct component *c;
size_t i;
int ret = 0;
WARN_ON(!mutex_is_locked(&component_mutex));
master = __master_find(master_dev, NULL);
if (!master)
return -EINVAL;
/* Bind components in match order */
for (i = 0; i < master->match->num; i++)
if (!master->match->compare[i].duplicate) {
c = master->match->compare[i].component;
ret = component_bind(c, master, data);
if (ret)
break;
}
if (ret != 0) {
for (; i--; )
if (!master->match->compare[i].duplicate) {
c = master->match->compare[i].component;
component_unbind(c, master, data);
}
}
return ret;
}
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| Russell King | 179 | 100.00% | 2 | 100.00% |
| Total | 179 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(component_bind_all);
int component_add(struct device *dev, const struct component_ops *ops)
{
struct component *component;
int ret;
component = kzalloc(sizeof(*component), GFP_KERNEL);
if (!component)
return -ENOMEM;
component->ops = ops;
component->dev = dev;
dev_dbg(dev, "adding component (ops %ps)\n", ops);
mutex_lock(&component_mutex);
list_add_tail(&component->node, &component_list);
ret = try_to_bring_up_masters(component);
if (ret < 0) {
if (component->master)
remove_component(component->master, component);
list_del(&component->node);
kfree(component);
}
mutex_unlock(&component_mutex);
return ret < 0 ? ret : 0;
}
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| Total | 142 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(component_add);
void component_del(struct device *dev, const struct component_ops *ops)
{
struct component *c, *component = NULL;
mutex_lock(&component_mutex);
list_for_each_entry(c, &component_list, node)
if (c->dev == dev && c->ops == ops) {
list_del(&c->node);
component = c;
break;
}
if (component && component->master) {
take_down_master(component->master);
remove_component(component->master, component);
}
mutex_unlock(&component_mutex);
WARN_ON(!component);
kfree(component);
}
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EXPORT_SYMBOL_GPL(component_del);
MODULE_LICENSE("GPL v2");
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| Total | 2353 | 100.00% | 11 | 100.00% |
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