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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>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* FSI device & driver interfaces
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*
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* Copyright (C) IBM Corporation 2016
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*/
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#ifndef LINUX_FSI_H
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#define LINUX_FSI_H
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#include <linux/device.h>
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struct fsi_device {
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struct device dev;
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u8 engine_type;
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u8 version;
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u8 unit;
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struct fsi_slave *slave;
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uint32_t addr;
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uint32_t size;
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};
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extern int fsi_device_read(struct fsi_device *dev, uint32_t addr,
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void *val, size_t size);
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extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
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const void *val, size_t size);
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extern int fsi_device_peek(struct fsi_device *dev, void *val);
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struct fsi_device_id {
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u8 engine_type;
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u8 version;
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};
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#define FSI_VERSION_ANY 0
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#define FSI_DEVICE(t) \
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.engine_type = (t), .version = FSI_VERSION_ANY,
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#define FSI_DEVICE_VERSIONED(t, v) \
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.engine_type = (t), .version = (v),
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struct fsi_driver {
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struct device_driver drv;
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const struct fsi_device_id *id_table;
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};
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#define to_fsi_dev(devp) container_of(devp, struct fsi_device, dev)
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#define to_fsi_drv(drvp) container_of_const(drvp, struct fsi_driver, drv)
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extern int fsi_driver_register(struct fsi_driver *fsi_drv);
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extern void fsi_driver_unregister(struct fsi_driver *fsi_drv);
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/* module_fsi_driver() - Helper macro for drivers that don't do
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* anything special in module init/exit. This eliminates a lot of
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* boilerplate. Each module may only use this macro once, and
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* calling it replaces module_init() and module_exit()
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*/
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#define module_fsi_driver(__fsi_driver) \
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module_driver(__fsi_driver, fsi_driver_register, \
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fsi_driver_unregister)
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/* direct slave API */
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extern int fsi_slave_claim_range(struct fsi_slave *slave,
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uint32_t addr, uint32_t size);
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extern void fsi_slave_release_range(struct fsi_slave *slave,
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uint32_t addr, uint32_t size);
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extern int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
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void *val, size_t size);
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extern int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
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const void *val, size_t size);
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extern struct bus_type fsi_bus_type;
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extern const struct device_type fsi_cdev_type;
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enum fsi_dev_type {
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fsi_dev_cfam,
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fsi_dev_sbefifo,
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fsi_dev_scom,
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fsi_dev_occ
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};
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extern int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
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dev_t *out_dev, int *out_index);
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extern void fsi_free_minor(dev_t dev);
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#endif /* LINUX_FSI_H */
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