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770 lines
21 KiB
770 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Componentized device handling. |
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* |
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* This is work in progress. We gather up the component devices into a list, |
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* and bind them when instructed. At the moment, we're specific to the DRM |
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* subsystem, and only handles one master device, but this doesn't have to be |
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* the case. |
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*/ |
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#include <linux/component.h> |
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#include <linux/device.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/debugfs.h> |
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|
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/** |
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* DOC: overview |
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* |
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* The component helper allows drivers to collect a pile of sub-devices, |
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* including their bound drivers, into an aggregate driver. Various subsystems |
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* already provide functions to get hold of such components, e.g. |
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* of_clk_get_by_name(). The component helper can be used when such a |
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* subsystem-specific way to find a device is not available: The component |
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* helper fills the niche of aggregate drivers for specific hardware, where |
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* further standardization into a subsystem would not be practical. The common |
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* example is when a logical device (e.g. a DRM display driver) is spread around |
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* the SoC on various components (scanout engines, blending blocks, transcoders |
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* for various outputs and so on). |
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* |
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* The component helper also doesn't solve runtime dependencies, e.g. for system |
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* suspend and resume operations. See also :ref:`device links<device_link>`. |
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* |
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* Components are registered using component_add() and unregistered with |
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* component_del(), usually from the driver's probe and disconnect functions. |
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* |
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* Aggregate drivers first assemble a component match list of what they need |
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* using component_match_add(). This is then registered as an aggregate driver |
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* using component_master_add_with_match(), and unregistered using |
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* component_master_del(). |
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*/ |
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|
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struct component; |
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|
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struct component_match_array { |
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void *data; |
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int (*compare)(struct device *, void *); |
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int (*compare_typed)(struct device *, int, void *); |
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void (*release)(struct device *, void *); |
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struct component *component; |
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bool duplicate; |
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}; |
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|
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struct component_match { |
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size_t alloc; |
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size_t num; |
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struct component_match_array *compare; |
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}; |
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struct master { |
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struct list_head node; |
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bool bound; |
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|
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const struct component_master_ops *ops; |
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struct device *parent; |
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struct component_match *match; |
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}; |
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struct component { |
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struct list_head node; |
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struct master *master; |
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bool bound; |
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|
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const struct component_ops *ops; |
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int subcomponent; |
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struct device *dev; |
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}; |
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|
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static DEFINE_MUTEX(component_mutex); |
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static LIST_HEAD(component_list); |
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static LIST_HEAD(masters); |
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|
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#ifdef CONFIG_DEBUG_FS |
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|
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static struct dentry *component_debugfs_dir; |
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|
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static int component_devices_show(struct seq_file *s, void *data) |
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{ |
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struct master *m = s->private; |
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struct component_match *match = m->match; |
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size_t i; |
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mutex_lock(&component_mutex); |
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seq_printf(s, "%-40s %20s\n", "master name", "status"); |
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seq_puts(s, "-------------------------------------------------------------\n"); |
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seq_printf(s, "%-40s %20s\n\n", |
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dev_name(m->parent), m->bound ? "bound" : "not bound"); |
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|
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seq_printf(s, "%-40s %20s\n", "device name", "status"); |
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seq_puts(s, "-------------------------------------------------------------\n"); |
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for (i = 0; i < match->num; i++) { |
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struct component *component = match->compare[i].component; |
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|
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seq_printf(s, "%-40s %20s\n", |
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component ? dev_name(component->dev) : "(unknown)", |
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component ? (component->bound ? "bound" : "not bound") : "not registered"); |
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} |
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mutex_unlock(&component_mutex); |
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return 0; |
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} |
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|
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DEFINE_SHOW_ATTRIBUTE(component_devices); |
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static int __init component_debug_init(void) |
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{ |
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component_debugfs_dir = debugfs_create_dir("device_component", NULL); |
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return 0; |
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} |
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core_initcall(component_debug_init); |
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static void component_master_debugfs_add(struct master *m) |
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{ |
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debugfs_create_file(dev_name(m->parent), 0444, component_debugfs_dir, m, |
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&component_devices_fops); |
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} |
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|
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static void component_master_debugfs_del(struct master *m) |
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{ |
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debugfs_remove(debugfs_lookup(dev_name(m->parent), component_debugfs_dir)); |
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} |
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#else |
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|
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static void component_master_debugfs_add(struct master *m) |
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{ } |
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static void component_master_debugfs_del(struct master *m) |
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{ } |
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#endif |
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static struct master *__master_find(struct device *parent, |
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const struct component_master_ops *ops) |
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{ |
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struct master *m; |
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list_for_each_entry(m, &masters, node) |
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if (m->parent == parent && (!ops || m->ops == ops)) |
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return m; |
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return NULL; |
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} |
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static struct component *find_component(struct master *master, |
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struct component_match_array *mc) |
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{ |
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struct component *c; |
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list_for_each_entry(c, &component_list, node) { |
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if (c->master && c->master != master) |
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continue; |
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if (mc->compare && mc->compare(c->dev, mc->data)) |
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return c; |
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if (mc->compare_typed && |
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mc->compare_typed(c->dev, c->subcomponent, mc->data)) |
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return c; |
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} |
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return NULL; |
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} |
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static int find_components(struct master *master) |
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{ |
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struct component_match *match = master->match; |
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size_t i; |
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int ret = 0; |
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/* |
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* Scan the array of match functions and attach |
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* any components which are found to this master. |
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*/ |
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for (i = 0; i < match->num; i++) { |
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struct component_match_array *mc = &match->compare[i]; |
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struct component *c; |
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dev_dbg(master->parent, "Looking for component %zu\n", i); |
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if (match->compare[i].component) |
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continue; |
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c = find_component(master, mc); |
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if (!c) { |
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ret = -ENXIO; |
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break; |
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} |
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dev_dbg(master->parent, "found component %s, duplicate %u\n", dev_name(c->dev), !!c->master); |
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/* Attach this component to the master */ |
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match->compare[i].duplicate = !!c->master; |
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match->compare[i].component = c; |
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c->master = master; |
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} |
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return ret; |
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} |
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/* Detach component from associated master */ |
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static void remove_component(struct master *master, struct component *c) |
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{ |
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size_t i; |
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|
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/* Detach the component from this master. */ |
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for (i = 0; i < master->match->num; i++) |
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if (master->match->compare[i].component == c) |
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master->match->compare[i].component = NULL; |
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} |
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|
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/* |
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* Try to bring up a master. If component is NULL, we're interested in |
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* this master, otherwise it's a component which must be present to try |
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* and bring up the master. |
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* |
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* Returns 1 for successful bringup, 0 if not ready, or -ve errno. |
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*/ |
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static int try_to_bring_up_master(struct master *master, |
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struct component *component) |
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{ |
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int ret; |
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dev_dbg(master->parent, "trying to bring up master\n"); |
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if (find_components(master)) { |
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dev_dbg(master->parent, "master has incomplete components\n"); |
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return 0; |
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} |
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if (component && component->master != master) { |
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dev_dbg(master->parent, "master is not for this component (%s)\n", |
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dev_name(component->dev)); |
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return 0; |
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} |
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if (!devres_open_group(master->parent, NULL, GFP_KERNEL)) |
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return -ENOMEM; |
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/* Found all components */ |
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ret = master->ops->bind(master->parent); |
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if (ret < 0) { |
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devres_release_group(master->parent, NULL); |
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if (ret != -EPROBE_DEFER) |
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dev_info(master->parent, "master bind failed: %d\n", ret); |
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return ret; |
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} |
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master->bound = true; |
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return 1; |
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} |
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static int try_to_bring_up_masters(struct component *component) |
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{ |
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struct master *m; |
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int ret = 0; |
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list_for_each_entry(m, &masters, node) { |
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if (!m->bound) { |
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ret = try_to_bring_up_master(m, component); |
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if (ret != 0) |
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break; |
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} |
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} |
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return ret; |
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} |
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static void take_down_master(struct master *master) |
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{ |
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if (master->bound) { |
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master->ops->unbind(master->parent); |
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devres_release_group(master->parent, NULL); |
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master->bound = false; |
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} |
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} |
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static void devm_component_match_release(struct device *parent, void *res) |
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{ |
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struct component_match *match = res; |
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unsigned int i; |
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for (i = 0; i < match->num; i++) { |
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struct component_match_array *mc = &match->compare[i]; |
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if (mc->release) |
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mc->release(parent, mc->data); |
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} |
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kfree(match->compare); |
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} |
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static int component_match_realloc(struct component_match *match, size_t num) |
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{ |
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struct component_match_array *new; |
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if (match->alloc == num) |
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return 0; |
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new = kmalloc_array(num, sizeof(*new), GFP_KERNEL); |
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if (!new) |
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return -ENOMEM; |
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if (match->compare) { |
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memcpy(new, match->compare, sizeof(*new) * |
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min(match->num, num)); |
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kfree(match->compare); |
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} |
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match->compare = new; |
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match->alloc = num; |
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return 0; |
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} |
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static void __component_match_add(struct device *master, |
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struct component_match **matchptr, |
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void (*release)(struct device *, void *), |
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int (*compare)(struct device *, void *), |
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int (*compare_typed)(struct device *, int, void *), |
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void *compare_data) |
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{ |
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struct component_match *match = *matchptr; |
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if (IS_ERR(match)) |
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return; |
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if (!match) { |
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match = devres_alloc(devm_component_match_release, |
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sizeof(*match), GFP_KERNEL); |
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if (!match) { |
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*matchptr = ERR_PTR(-ENOMEM); |
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return; |
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} |
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devres_add(master, match); |
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*matchptr = match; |
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} |
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if (match->num == match->alloc) { |
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size_t new_size = match->alloc + 16; |
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int ret; |
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ret = component_match_realloc(match, new_size); |
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if (ret) { |
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*matchptr = ERR_PTR(ret); |
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return; |
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} |
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} |
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match->compare[match->num].compare = compare; |
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match->compare[match->num].compare_typed = compare_typed; |
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match->compare[match->num].release = release; |
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match->compare[match->num].data = compare_data; |
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match->compare[match->num].component = NULL; |
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match->num++; |
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} |
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/** |
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* component_match_add_release - add a component match entry with release callback |
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* @master: device with the aggregate driver |
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* @matchptr: pointer to the list of component matches |
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* @release: release function for @compare_data |
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* @compare: compare function to match against all components |
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* @compare_data: opaque pointer passed to the @compare function |
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* |
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* Adds a new component match to the list stored in @matchptr, which the @master |
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* aggregate driver needs to function. The list of component matches pointed to |
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* by @matchptr must be initialized to NULL before adding the first match. This |
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* only matches against components added with component_add(). |
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* |
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* The allocated match list in @matchptr is automatically released using devm |
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* actions, where upon @release will be called to free any references held by |
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* @compare_data, e.g. when @compare_data is a &device_node that must be |
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* released with of_node_put(). |
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* |
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* See also component_match_add() and component_match_add_typed(). |
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*/ |
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void component_match_add_release(struct device *master, |
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struct component_match **matchptr, |
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void (*release)(struct device *, void *), |
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int (*compare)(struct device *, void *), void *compare_data) |
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{ |
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__component_match_add(master, matchptr, release, compare, NULL, |
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compare_data); |
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} |
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EXPORT_SYMBOL(component_match_add_release); |
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/** |
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* component_match_add_typed - add a component match entry for a typed component |
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* @master: device with the aggregate driver |
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* @matchptr: pointer to the list of component matches |
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* @compare_typed: compare function to match against all typed components |
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* @compare_data: opaque pointer passed to the @compare function |
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* |
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* Adds a new component match to the list stored in @matchptr, which the @master |
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* aggregate driver needs to function. The list of component matches pointed to |
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* by @matchptr must be initialized to NULL before adding the first match. This |
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* only matches against components added with component_add_typed(). |
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* |
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* The allocated match list in @matchptr is automatically released using devm |
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* actions. |
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* |
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* See also component_match_add_release() and component_match_add_typed(). |
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*/ |
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void component_match_add_typed(struct device *master, |
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struct component_match **matchptr, |
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int (*compare_typed)(struct device *, int, void *), void *compare_data) |
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{ |
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__component_match_add(master, matchptr, NULL, NULL, compare_typed, |
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compare_data); |
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} |
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EXPORT_SYMBOL(component_match_add_typed); |
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static void free_master(struct master *master) |
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{ |
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struct component_match *match = master->match; |
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int i; |
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component_master_debugfs_del(master); |
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list_del(&master->node); |
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if (match) { |
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for (i = 0; i < match->num; i++) { |
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struct component *c = match->compare[i].component; |
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if (c) |
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c->master = NULL; |
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} |
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} |
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kfree(master); |
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} |
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/** |
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* component_master_add_with_match - register an aggregate driver |
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* @parent: parent device of the aggregate driver |
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* @ops: callbacks for the aggregate driver |
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* @match: component match list for the aggregate driver |
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* |
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* Registers a new aggregate driver consisting of the components added to @match |
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* by calling one of the component_match_add() functions. Once all components in |
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* @match are available, it will be assembled by calling |
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* &component_master_ops.bind from @ops. Must be unregistered by calling |
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* component_master_del(). |
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*/ |
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int component_master_add_with_match(struct device *parent, |
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const struct component_master_ops *ops, |
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struct component_match *match) |
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{ |
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struct master *master; |
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int ret; |
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/* Reallocate the match array for its true size */ |
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ret = component_match_realloc(match, match->num); |
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if (ret) |
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return ret; |
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master = kzalloc(sizeof(*master), GFP_KERNEL); |
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if (!master) |
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return -ENOMEM; |
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master->parent = parent; |
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master->ops = ops; |
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master->match = match; |
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component_master_debugfs_add(master); |
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/* Add to the list of available masters. */ |
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mutex_lock(&component_mutex); |
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list_add(&master->node, &masters); |
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ret = try_to_bring_up_master(master, NULL); |
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if (ret < 0) |
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free_master(master); |
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mutex_unlock(&component_mutex); |
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return ret < 0 ? ret : 0; |
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} |
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EXPORT_SYMBOL_GPL(component_master_add_with_match); |
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/** |
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* component_master_del - unregister an aggregate driver |
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* @parent: parent device of the aggregate driver |
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* @ops: callbacks for the aggregate driver |
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* |
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* Unregisters an aggregate driver registered with |
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* component_master_add_with_match(). If necessary the aggregate driver is first |
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* disassembled by calling &component_master_ops.unbind from @ops. |
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*/ |
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void component_master_del(struct device *parent, |
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const struct component_master_ops *ops) |
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{ |
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struct master *master; |
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mutex_lock(&component_mutex); |
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master = __master_find(parent, ops); |
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if (master) { |
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take_down_master(master); |
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free_master(master); |
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} |
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mutex_unlock(&component_mutex); |
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} |
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EXPORT_SYMBOL_GPL(component_master_del); |
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|
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static void component_unbind(struct component *component, |
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struct master *master, void *data) |
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{ |
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WARN_ON(!component->bound); |
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if (component->ops && component->ops->unbind) |
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component->ops->unbind(component->dev, master->parent, data); |
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component->bound = false; |
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|
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/* Release all resources claimed in the binding of this component */ |
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devres_release_group(component->dev, component); |
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} |
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|
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/** |
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* component_unbind_all - unbind all components of an aggregate driver |
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* @parent: parent device of the aggregate driver |
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* @data: opaque pointer, passed to all components |
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* |
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* Unbinds all components of the aggregate device by passing @data to their |
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* &component_ops.unbind functions. Should be called from |
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* &component_master_ops.unbind. |
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*/ |
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void component_unbind_all(struct device *parent, void *data) |
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{ |
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struct master *master; |
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struct component *c; |
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size_t i; |
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|
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WARN_ON(!mutex_is_locked(&component_mutex)); |
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master = __master_find(parent, NULL); |
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if (!master) |
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return; |
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/* Unbind components in reverse order */ |
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for (i = master->match->num; i--; ) |
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if (!master->match->compare[i].duplicate) { |
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c = master->match->compare[i].component; |
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component_unbind(c, master, data); |
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} |
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} |
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EXPORT_SYMBOL_GPL(component_unbind_all); |
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static int component_bind(struct component *component, struct master *master, |
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void *data) |
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{ |
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int ret; |
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|
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/* |
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* Each component initialises inside its own devres group. |
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* This allows us to roll-back a failed component without |
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* affecting anything else. |
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*/ |
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if (!devres_open_group(master->parent, NULL, GFP_KERNEL)) |
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return -ENOMEM; |
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|
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/* |
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* Also open a group for the device itself: this allows us |
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* to release the resources claimed against the sub-device |
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* at the appropriate moment. |
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*/ |
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if (!devres_open_group(component->dev, component, GFP_KERNEL)) { |
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devres_release_group(master->parent, NULL); |
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return -ENOMEM; |
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} |
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dev_dbg(master->parent, "binding %s (ops %ps)\n", |
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dev_name(component->dev), component->ops); |
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|
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ret = component->ops->bind(component->dev, master->parent, data); |
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if (!ret) { |
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component->bound = true; |
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|
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/* |
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* Close the component device's group so that resources |
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* allocated in the binding are encapsulated for removal |
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* at unbind. Remove the group on the DRM device as we |
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* can clean those resources up independently. |
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*/ |
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devres_close_group(component->dev, NULL); |
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devres_remove_group(master->parent, NULL); |
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|
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dev_info(master->parent, "bound %s (ops %ps)\n", |
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dev_name(component->dev), component->ops); |
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} else { |
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devres_release_group(component->dev, NULL); |
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devres_release_group(master->parent, NULL); |
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|
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if (ret != -EPROBE_DEFER) |
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dev_err(master->parent, "failed to bind %s (ops %ps): %d\n", |
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dev_name(component->dev), component->ops, ret); |
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} |
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|
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return ret; |
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} |
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|
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/** |
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* component_bind_all - bind all components of an aggregate driver |
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* @parent: parent device of the aggregate driver |
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* @data: opaque pointer, passed to all components |
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* |
|
* 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 *parent, void *data) |
|
{ |
|
struct master *master; |
|
struct component *c; |
|
size_t i; |
|
int ret = 0; |
|
|
|
WARN_ON(!mutex_is_locked(&component_mutex)); |
|
|
|
master = __master_find(parent, 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 > 0; i--) |
|
if (!master->match->compare[i - 1].duplicate) { |
|
c = master->match->compare[i - 1].component; |
|
component_unbind(c, master, data); |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(component_bind_all); |
|
|
|
static int __component_add(struct device *dev, const struct component_ops *ops, |
|
int subcomponent) |
|
{ |
|
struct component *component; |
|
int ret; |
|
|
|
component = kzalloc(sizeof(*component), GFP_KERNEL); |
|
if (!component) |
|
return -ENOMEM; |
|
|
|
component->ops = ops; |
|
component->dev = dev; |
|
component->subcomponent = subcomponent; |
|
|
|
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; |
|
} |
|
|
|
/** |
|
* 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; |
|
|
|
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); |
|
} |
|
EXPORT_SYMBOL_GPL(component_del);
|
|
|