forked from mirrors/linux
d69d804845
In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki <rafael@kernel.org> Reviewed-by: Alex Elder <elder@kernel.org> Acked-by: Sumit Garg <sumit.garg@linaro.org> Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Greybus driver and device API
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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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#ifndef __LINUX_GREYBUS_H
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#define __LINUX_GREYBUS_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/idr.h>
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#include <linux/greybus/greybus_id.h>
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#include <linux/greybus/greybus_manifest.h>
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#include <linux/greybus/greybus_protocols.h>
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#include <linux/greybus/manifest.h>
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#include <linux/greybus/hd.h>
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#include <linux/greybus/svc.h>
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#include <linux/greybus/control.h>
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#include <linux/greybus/module.h>
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#include <linux/greybus/interface.h>
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#include <linux/greybus/bundle.h>
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#include <linux/greybus/connection.h>
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#include <linux/greybus/operation.h>
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/* Matches up with the Greybus Protocol specification document */
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#define GREYBUS_VERSION_MAJOR 0x00
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#define GREYBUS_VERSION_MINOR 0x01
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#define GREYBUS_ID_MATCH_DEVICE \
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(GREYBUS_ID_MATCH_VENDOR | GREYBUS_ID_MATCH_PRODUCT)
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#define GREYBUS_DEVICE(v, p) \
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.match_flags = GREYBUS_ID_MATCH_DEVICE, \
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.vendor = (v), \
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.product = (p),
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#define GREYBUS_DEVICE_CLASS(c) \
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.match_flags = GREYBUS_ID_MATCH_CLASS, \
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.class = (c),
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/* Maximum number of CPorts */
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#define CPORT_ID_MAX 4095 /* UniPro max id is 4095 */
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#define CPORT_ID_BAD U16_MAX
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struct greybus_driver {
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const char *name;
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int (*probe)(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id);
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void (*disconnect)(struct gb_bundle *bundle);
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const struct greybus_bundle_id *id_table;
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struct device_driver driver;
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};
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#define to_greybus_driver(d) container_of_const(d, struct greybus_driver, driver)
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static inline void greybus_set_drvdata(struct gb_bundle *bundle, void *data)
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{
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dev_set_drvdata(&bundle->dev, data);
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}
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static inline void *greybus_get_drvdata(struct gb_bundle *bundle)
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{
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return dev_get_drvdata(&bundle->dev);
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}
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/* Don't call these directly, use the module_greybus_driver() macro instead */
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int greybus_register_driver(struct greybus_driver *driver,
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struct module *module, const char *mod_name);
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void greybus_deregister_driver(struct greybus_driver *driver);
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/* define to get proper THIS_MODULE and KBUILD_MODNAME values */
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#define greybus_register(driver) \
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greybus_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
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#define greybus_deregister(driver) \
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greybus_deregister_driver(driver)
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/**
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* module_greybus_driver() - Helper macro for registering a Greybus driver
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* @__greybus_driver: greybus_driver structure
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*
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* Helper macro for Greybus drivers to set up proper module init / exit
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* functions. Replaces module_init() and module_exit() and keeps people from
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* printing pointless things to the kernel log when their driver is loaded.
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*/
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#define module_greybus_driver(__greybus_driver) \
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module_driver(__greybus_driver, greybus_register, greybus_deregister)
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int greybus_disabled(void);
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void gb_debugfs_init(void);
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void gb_debugfs_cleanup(void);
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struct dentry *gb_debugfs_get(void);
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extern const struct bus_type greybus_bus_type;
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extern const struct device_type greybus_hd_type;
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extern const struct device_type greybus_module_type;
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extern const struct device_type greybus_interface_type;
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extern const struct device_type greybus_control_type;
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extern const struct device_type greybus_bundle_type;
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extern const struct device_type greybus_svc_type;
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static inline bool cport_id_valid(struct gb_host_device *hd, u16 cport_id)
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{
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return cport_id != CPORT_ID_BAD && cport_id < hd->num_cports;
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}
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#endif /* __KERNEL__ */
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#endif /* __LINUX_GREYBUS_H */
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