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		ioctl.h — 2.3 KB 2026-09-11 13:33 · rw-r--r--	2.3 KB	2026-09-11 13:33	rw-r--r--

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef LINUX_MMC_IOCTL_H #define LINUX_MMC_IOCTL_H #include #include struct mmc_ioc_cmd { /* * Direction of data: nonzero = write, zero = read. * Bit 31 selects 'Reliable Write' for RPMB. */ int write_flag; /* Application-specific command. true = precede with CMD55 */ int is_acmd; __u32 opcode; __u32 arg; __u32 response[4]; /* CMD response */ unsigned int flags; unsigned int blksz; unsigned int blocks; /* * Sleep at least postsleep_min_us useconds, and at most * postsleep_max_us useconds *after* issuing command. Needed for * some read commands for which cards have no other way of indicating * they're ready for the next command (i.e. there is no equivalent of * a "busy" indicator for read operations). */ unsigned int postsleep_min_us; unsigned int postsleep_max_us; /* * Override driver-computed timeouts. Note the difference in units! */ unsigned int data_timeout_ns; unsigned int cmd_timeout_ms; /* * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to * be 8-byte aligned. Make sure this struct is the same size when * built for 32-bit. */ __u32 __pad; /* DAT buffer */ __u64 data_ptr; }; #define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr /** * struct mmc_ioc_multi_cmd - multi command information * @num_of_cmds: Number of commands to send. Must be equal to or less than * MMC_IOC_MAX_CMDS. * @cmds: Array of commands with length equal to 'num_of_cmds' */ struct mmc_ioc_multi_cmd { __u64 num_of_cmds; struct mmc_ioc_cmd cmds[0]; }; #define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd) /* * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by * the structure mmc_ioc_multi_cmd. The MMC driver will issue all * commands in array in sequence to card. */ #define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd) /* * Since this ioctl is only meant to enhance (and not replace) normal access * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES * is enforced per ioctl call. For larger data transfers, use the normal * block device operations. */ #define MMC_IOC_MAX_BYTES (512L * 1024) #define MMC_IOC_MAX_CMDS 255 #endif /* LINUX_MMC_IOCTL_H */