58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
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#ifndef UAPI_UFS_IOCTL_H_
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#define UAPI_UFS_IOCTL_H_
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#include <linux/types.h>
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/*
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* IOCTL opcode for ufs queries has the following opcode after
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* SCSI_IOCTL_GET_PCI
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*/
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#define UFS_IOCTL_QUERY 0x5388
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/**
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* struct ufs_ioctl_query_data - used to transfer data to and from user via ioctl
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* @opcode: type of data to query (descriptor/attribute/flag)
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* @idn: id of the data structure
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* @buf_size: number of allocated bytes/data size on return
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* @buffer: data location
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*
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* Received: buffer and buf_size (available space for transfered data)
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* Submitted: opcode, idn, length, buf_size
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*/
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struct ufs_ioctl_query_data {
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/*
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* User should select one of the opcode defined in "enum query_opcode".
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* Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
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* Note that only UPIU_QUERY_OPCODE_READ_DESC,
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* UPIU_QUERY_OPCODE_READ_ATTR & UPIU_QUERY_OPCODE_READ_FLAG are
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* supported as of now. All other query_opcode would be considered
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* invalid.
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* As of now only read query operations are supported.
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*/
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__u32 opcode;
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/*
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* User should select one of the idn from "enum flag_idn" or "enum
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* attr_idn" or "enum desc_idn" based on whether opcode above is
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* attribute, flag or descriptor.
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* Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
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*/
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__u8 idn;
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/*
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* User should specify the size of the buffer (buffer[0] below) where
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* it wants to read the query data (attribute/flag/descriptor).
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* As we might end up reading less data then what is specified in
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* buf_size. So we are updating buf_size to what exactly we have read.
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*/
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__u16 buf_size;
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/*
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* placeholder for the start of the data buffer where kernel will copy
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* the query data (attribute/flag/descriptor) read from the UFS device
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* Note:
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* For Read/Write Attribute you will have to allocate 4 bytes
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* For Read/Write Flag you will have to allocate 1 byte
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*/
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__u8 buffer[0];
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};
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#endif /* UAPI_UFS_IOCTL_H_ */
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