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>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Turris Mox module configuration bus driver
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*
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* Copyright (C) 2019 Marek Behún <kabel@kernel.org>
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*/
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#ifndef __LINUX_MOXTET_H
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#define __LINUX_MOXTET_H
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#include <linux/device.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/mutex.h>
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#define TURRIS_MOX_MAX_MODULES 10
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enum turris_mox_cpu_module_id {
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TURRIS_MOX_CPU_ID_EMMC = 0x00,
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TURRIS_MOX_CPU_ID_SD = 0x10,
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};
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enum turris_mox_module_id {
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TURRIS_MOX_MODULE_FIRST = 0x01,
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TURRIS_MOX_MODULE_SFP = 0x01,
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TURRIS_MOX_MODULE_PCI = 0x02,
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TURRIS_MOX_MODULE_TOPAZ = 0x03,
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TURRIS_MOX_MODULE_PERIDOT = 0x04,
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TURRIS_MOX_MODULE_USB3 = 0x05,
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TURRIS_MOX_MODULE_PCI_BRIDGE = 0x06,
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TURRIS_MOX_MODULE_LAST = 0x06,
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};
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#define MOXTET_NIRQS 16
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struct moxtet {
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struct device *dev;
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struct mutex lock;
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u8 modules[TURRIS_MOX_MAX_MODULES];
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int count;
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u8 tx[TURRIS_MOX_MAX_MODULES];
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int dev_irq;
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struct {
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struct irq_domain *domain;
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struct irq_chip chip;
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unsigned long masked, exists;
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struct moxtet_irqpos {
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u8 idx;
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u8 bit;
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} position[MOXTET_NIRQS];
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} irq;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs_root;
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#endif
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};
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struct moxtet_driver {
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const enum turris_mox_module_id *id_table;
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struct device_driver driver;
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};
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#define to_moxtet_driver(__drv) \
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( __drv ? container_of_const(__drv, struct moxtet_driver, driver) : NULL )
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extern int __moxtet_register_driver(struct module *owner,
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struct moxtet_driver *mdrv);
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static inline void moxtet_unregister_driver(struct moxtet_driver *mdrv)
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{
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if (mdrv)
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driver_unregister(&mdrv->driver);
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}
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#define moxtet_register_driver(driver) \
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__moxtet_register_driver(THIS_MODULE, driver)
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#define module_moxtet_driver(__moxtet_driver) \
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module_driver(__moxtet_driver, moxtet_register_driver, \
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moxtet_unregister_driver)
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struct moxtet_device {
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struct device dev;
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struct moxtet *moxtet;
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enum turris_mox_module_id id;
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unsigned int idx;
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};
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extern int moxtet_device_read(struct device *dev);
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extern int moxtet_device_write(struct device *dev, u8 val);
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extern int moxtet_device_written(struct device *dev);
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static inline struct moxtet_device *
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to_moxtet_device(struct device *dev)
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{
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if (!dev)
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return NULL;
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return container_of(dev, struct moxtet_device, dev);
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}
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#endif /* __LINUX_MOXTET_H */
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