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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The uevent() callback in struct bus_type should not be modifying the device that is passed into it, so mark it as a const * and propagate the function signature changes out into all relevant subsystems that use this callback. Acked-by: Rafael J. Wysocki <rafael@kernel.org> Acked-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20230111113018.459199-16-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
349 lines
8 KiB
C
349 lines
8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Greybus "Core"
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define CREATE_TRACE_POINTS
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#include <linux/greybus.h>
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#include "greybus_trace.h"
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#define GB_BUNDLE_AUTOSUSPEND_MS 3000
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/* Allow greybus to be disabled at boot if needed */
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static bool nogreybus;
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#ifdef MODULE
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module_param(nogreybus, bool, 0444);
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#else
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core_param(nogreybus, nogreybus, bool, 0444);
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#endif
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int greybus_disabled(void)
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{
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return nogreybus;
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}
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EXPORT_SYMBOL_GPL(greybus_disabled);
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static bool greybus_match_one_id(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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if ((id->match_flags & GREYBUS_ID_MATCH_VENDOR) &&
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(id->vendor != bundle->intf->vendor_id))
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return false;
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if ((id->match_flags & GREYBUS_ID_MATCH_PRODUCT) &&
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(id->product != bundle->intf->product_id))
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return false;
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if ((id->match_flags & GREYBUS_ID_MATCH_CLASS) &&
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(id->class != bundle->class))
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return false;
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return true;
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}
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static const struct greybus_bundle_id *
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greybus_match_id(struct gb_bundle *bundle, const struct greybus_bundle_id *id)
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{
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if (!id)
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return NULL;
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for (; id->vendor || id->product || id->class || id->driver_info;
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id++) {
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if (greybus_match_one_id(bundle, id))
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return id;
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}
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return NULL;
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}
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static int greybus_match_device(struct device *dev, struct device_driver *drv)
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{
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struct greybus_driver *driver = to_greybus_driver(drv);
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struct gb_bundle *bundle;
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const struct greybus_bundle_id *id;
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if (!is_gb_bundle(dev))
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return 0;
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bundle = to_gb_bundle(dev);
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id = greybus_match_id(bundle, driver->id_table);
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if (id)
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return 1;
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/* FIXME - Dynamic ids? */
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return 0;
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}
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static int greybus_uevent(const struct device *dev, struct kobj_uevent_env *env)
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{
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const struct gb_host_device *hd;
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const struct gb_module *module = NULL;
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const struct gb_interface *intf = NULL;
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const struct gb_control *control = NULL;
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const struct gb_bundle *bundle = NULL;
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const struct gb_svc *svc = NULL;
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if (is_gb_host_device(dev)) {
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hd = to_gb_host_device(dev);
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} else if (is_gb_module(dev)) {
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module = to_gb_module(dev);
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hd = module->hd;
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} else if (is_gb_interface(dev)) {
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intf = to_gb_interface(dev);
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module = intf->module;
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hd = intf->hd;
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} else if (is_gb_control(dev)) {
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control = to_gb_control(dev);
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intf = control->intf;
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module = intf->module;
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hd = intf->hd;
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} else if (is_gb_bundle(dev)) {
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bundle = to_gb_bundle(dev);
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intf = bundle->intf;
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module = intf->module;
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hd = intf->hd;
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} else if (is_gb_svc(dev)) {
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svc = to_gb_svc(dev);
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hd = svc->hd;
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} else {
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dev_WARN(dev, "uevent for unknown greybus device \"type\"!\n");
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return -EINVAL;
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}
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if (add_uevent_var(env, "BUS=%u", hd->bus_id))
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return -ENOMEM;
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if (module) {
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if (add_uevent_var(env, "MODULE=%u", module->module_id))
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return -ENOMEM;
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}
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if (intf) {
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if (add_uevent_var(env, "INTERFACE=%u", intf->interface_id))
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return -ENOMEM;
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if (add_uevent_var(env, "GREYBUS_ID=%08x/%08x",
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intf->vendor_id, intf->product_id))
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return -ENOMEM;
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}
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if (bundle) {
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// FIXME
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// add a uevent that can "load" a bundle type
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// This is what we need to bind a driver to so use the info
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// in gmod here as well
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if (add_uevent_var(env, "BUNDLE=%u", bundle->id))
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return -ENOMEM;
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if (add_uevent_var(env, "BUNDLE_CLASS=%02x", bundle->class))
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return -ENOMEM;
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}
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return 0;
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}
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static void greybus_shutdown(struct device *dev)
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{
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if (is_gb_host_device(dev)) {
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struct gb_host_device *hd;
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hd = to_gb_host_device(dev);
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gb_hd_shutdown(hd);
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}
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}
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struct bus_type greybus_bus_type = {
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.name = "greybus",
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.match = greybus_match_device,
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.uevent = greybus_uevent,
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.shutdown = greybus_shutdown,
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};
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static int greybus_probe(struct device *dev)
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{
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struct greybus_driver *driver = to_greybus_driver(dev->driver);
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struct gb_bundle *bundle = to_gb_bundle(dev);
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const struct greybus_bundle_id *id;
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int retval;
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/* match id */
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id = greybus_match_id(bundle, driver->id_table);
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if (!id)
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return -ENODEV;
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retval = pm_runtime_get_sync(&bundle->intf->dev);
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if (retval < 0) {
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pm_runtime_put_noidle(&bundle->intf->dev);
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return retval;
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}
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retval = gb_control_bundle_activate(bundle->intf->control, bundle->id);
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if (retval) {
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pm_runtime_put(&bundle->intf->dev);
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return retval;
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}
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/*
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* Unbound bundle devices are always deactivated. During probe, the
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* Runtime PM is set to enabled and active and the usage count is
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* incremented. If the driver supports runtime PM, it should call
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* pm_runtime_put() in its probe routine and pm_runtime_get_sync()
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* in remove routine.
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*/
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pm_runtime_set_autosuspend_delay(dev, GB_BUNDLE_AUTOSUSPEND_MS);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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retval = driver->probe(bundle, id);
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if (retval) {
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/*
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* Catch buggy drivers that fail to destroy their connections.
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*/
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WARN_ON(!list_empty(&bundle->connections));
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gb_control_bundle_deactivate(bundle->intf->control, bundle->id);
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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pm_runtime_dont_use_autosuspend(dev);
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pm_runtime_put(&bundle->intf->dev);
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return retval;
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}
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pm_runtime_put(&bundle->intf->dev);
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return 0;
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}
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static int greybus_remove(struct device *dev)
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{
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struct greybus_driver *driver = to_greybus_driver(dev->driver);
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struct gb_bundle *bundle = to_gb_bundle(dev);
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struct gb_connection *connection;
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int retval;
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retval = pm_runtime_get_sync(dev);
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if (retval < 0)
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dev_err(dev, "failed to resume bundle: %d\n", retval);
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/*
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* Disable (non-offloaded) connections early in case the interface is
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* already gone to avoid unceccessary operation timeouts during
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* driver disconnect. Otherwise, only disable incoming requests.
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*/
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list_for_each_entry(connection, &bundle->connections, bundle_links) {
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if (gb_connection_is_offloaded(connection))
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continue;
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if (bundle->intf->disconnected)
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gb_connection_disable_forced(connection);
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else
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gb_connection_disable_rx(connection);
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}
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driver->disconnect(bundle);
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/* Catch buggy drivers that fail to destroy their connections. */
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WARN_ON(!list_empty(&bundle->connections));
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if (!bundle->intf->disconnected)
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gb_control_bundle_deactivate(bundle->intf->control, bundle->id);
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pm_runtime_put_noidle(dev);
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_dont_use_autosuspend(dev);
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pm_runtime_put_noidle(dev);
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return 0;
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}
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int greybus_register_driver(struct greybus_driver *driver, struct module *owner,
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const char *mod_name)
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{
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int retval;
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if (greybus_disabled())
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return -ENODEV;
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driver->driver.bus = &greybus_bus_type;
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driver->driver.name = driver->name;
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driver->driver.probe = greybus_probe;
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driver->driver.remove = greybus_remove;
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driver->driver.owner = owner;
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driver->driver.mod_name = mod_name;
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retval = driver_register(&driver->driver);
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if (retval)
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return retval;
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pr_info("registered new driver %s\n", driver->name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(greybus_register_driver);
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void greybus_deregister_driver(struct greybus_driver *driver)
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{
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driver_unregister(&driver->driver);
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}
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EXPORT_SYMBOL_GPL(greybus_deregister_driver);
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static int __init gb_init(void)
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{
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int retval;
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if (greybus_disabled())
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return -ENODEV;
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BUILD_BUG_ON(CPORT_ID_MAX >= (long)CPORT_ID_BAD);
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gb_debugfs_init();
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retval = bus_register(&greybus_bus_type);
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if (retval) {
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pr_err("bus_register failed (%d)\n", retval);
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goto error_bus;
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}
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retval = gb_hd_init();
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if (retval) {
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pr_err("gb_hd_init failed (%d)\n", retval);
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goto error_hd;
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}
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retval = gb_operation_init();
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if (retval) {
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pr_err("gb_operation_init failed (%d)\n", retval);
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goto error_operation;
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}
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return 0; /* Success */
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error_operation:
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gb_hd_exit();
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error_hd:
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bus_unregister(&greybus_bus_type);
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error_bus:
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gb_debugfs_cleanup();
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return retval;
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}
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module_init(gb_init);
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static void __exit gb_exit(void)
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{
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gb_operation_exit();
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gb_hd_exit();
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bus_unregister(&greybus_bus_type);
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gb_debugfs_cleanup();
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tracepoint_synchronize_unregister();
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}
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module_exit(gb_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
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