Release 4.7 drivers/usb/gadget/function/f_mass_storage.h

#ifndef USB_F_MASS_STORAGE_H

#define USB_F_MASS_STORAGE_H

#include <linux/usb/composite.h>
#include "storage_common.h"


struct fsg_module_parameters {
	
char		*file[FSG_MAX_LUNS];
	
bool		ro[FSG_MAX_LUNS];
	
bool		removable[FSG_MAX_LUNS];
	
bool		cdrom[FSG_MAX_LUNS];
	
bool		nofua[FSG_MAX_LUNS];

	



unsigned int	file_count, ro_count, removable_count, cdrom_count;
	
unsigned int	nofua_count;
	
unsigned int	luns;	/* nluns */
	
bool		stall;	/* can_stall */
};


#define _FSG_MODULE_PARAM_ARRAY(prefix, params, name, type, desc)	\
	module_param_array_named(prefix ## name, params.name, type,     \
                                 &prefix ## params.name ## _count,      \
                                 S_IRUGO);                              \
        MODULE_PARM_DESC(prefix ## name, desc)


#define _FSG_MODULE_PARAM(prefix, params, name, type, desc)		\
	module_param_named(prefix ## name, params.name, type,           \
                           S_IRUGO);                                    \
        MODULE_PARM_DESC(prefix ## name, desc)


#define __FSG_MODULE_PARAMETERS(prefix, params)				\
	_FSG_MODULE_PARAM_ARRAY(prefix, params, file, charp,            \
                                "names of backing files or devices");   \
        _FSG_MODULE_PARAM_ARRAY(prefix, params, ro, bool,               \
                                "true to force read-only");             \
        _FSG_MODULE_PARAM_ARRAY(prefix, params, removable, bool,        \
                                "true to simulate removable media");    \
        _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool,            \
                                "true to simulate CD-ROM instead of disk"); \
        _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool,            \
                                "true to ignore SCSI WRITE(10,12) FUA bit"); \
        _FSG_MODULE_PARAM(prefix, params, luns, uint,                   \
                          "number of LUNs");                            \
        _FSG_MODULE_PARAM(prefix, params, stall, bool,                  \
                          "false to prevent bulk stalls")

#ifdef CONFIG_USB_GADGET_DEBUG_FILES


#define FSG_MODULE_PARAMETERS(prefix, params)				\
	__FSG_MODULE_PARAMETERS(prefix, params);                        \
        module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);\
        MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers")
#else


#define FSG_MODULE_PARAMETERS(prefix, params)				\
	__FSG_MODULE_PARAMETERS(prefix, params)

#endif

struct fsg_common;

/* FSF callback functions */

struct fsg_operations {
	/*
         * Callback function to call when thread exits.  If no
         * callback is set or it returns value lower then zero MSF
         * will force eject all LUNs it operates on (including those
         * marked as non-removable or with prevent_medium_removal flag
         * set).
         */
	
int (*thread_exits)(struct fsg_common *common);
};


struct fsg_lun_opts {
	
struct config_group group;
	
struct fsg_lun *lun;
	
int lun_id;
};


struct fsg_opts {
	
struct fsg_common *common;
	
struct usb_function_instance func_inst;
	
struct fsg_lun_opts lun0;
	
struct config_group *default_groups[2];
	
bool no_configfs; /* for legacy gadgets */

	/*
         * Read/write access to configfs attributes is handled by configfs.
         *
         * This is to protect the data from concurrent access by read/write
         * and create symlink/remove symlink.
         */
	
struct mutex			lock;
	
int				refcnt;
};


struct fsg_lun_config {
	
const char *filename;
	
char ro;
	
char removable;
	
char cdrom;
	
char nofua;
};


struct fsg_config {
	
unsigned nluns;
	
struct fsg_lun_config luns[FSG_MAX_LUNS];

	/* Callback functions. */
	
const struct fsg_operations	*ops;
	/* Gadget's private data. */
	
void			*private_data;

	
const char *vendor_name;		/*  8 characters or less */
	
const char *product_name;		/* 16 characters or less */

	
char			can_stall;
	
unsigned int		fsg_num_buffers;
};


static inline struct fsg_opts *

fsg_opts_from_func_inst(const struct usb_function_instance *fi)
{
	return container_of(fi, struct fsg_opts, func_inst);
}

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void fsg_common_get(struct fsg_common *common);

void fsg_common_put(struct fsg_common *common);

void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs);

int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n);

void fsg_common_free_buffers(struct fsg_common *common);

int fsg_common_set_cdev(struct fsg_common *common,
			struct usb_composite_dev *cdev, bool can_stall);

void fsg_common_remove_lun(struct fsg_lun *lun);

void fsg_common_remove_luns(struct fsg_common *common);

void fsg_common_set_ops(struct fsg_common *common,
			const struct fsg_operations *ops);

int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
			  unsigned int id, const char *name,
			  const char **name_pfx);

int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg);

void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
				   const char *pn);

void fsg_config_from_params(struct fsg_config *cfg,
			    const struct fsg_module_parameters *params,
			    unsigned int fsg_num_buffers);

#endif /* USB_F_MASS_STORAGE_H */
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Directory: drivers/usb/gadget/function

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