1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef USB_STORAGE_COMMON_H
3 #define USB_STORAGE_COMMON_H
4 
5 #include <linux/device.h>
6 #include <linux/usb/storage.h>
7 #include <scsi/scsi.h>
8 #include <asm/unaligned.h>
9 
10 #ifndef DEBUG
11 #undef VERBOSE_DEBUG
12 #undef DUMP_MSGS
13 #endif /* !DEBUG */
14 
15 #ifdef VERBOSE_DEBUG
16 #define VLDBG	LDBG
17 #else
18 #define VLDBG(lun, fmt, args...) do { } while (0)
19 #endif /* VERBOSE_DEBUG */
20 
21 #define _LMSG(func, lun, fmt, args...)					\
22 	do {								\
23 		if ((lun)->name_pfx && *(lun)->name_pfx)		\
24 			func("%s/%s: " fmt, *(lun)->name_pfx,		\
25 				 (lun)->name, ## args);			\
26 		else							\
27 			func("%s: " fmt, (lun)->name, ## args);		\
28 	} while (0)
29 
30 #define LDBG(lun, fmt, args...)		_LMSG(pr_debug, lun, fmt, ## args)
31 #define LERROR(lun, fmt, args...)	_LMSG(pr_err, lun, fmt, ## args)
32 #define LWARN(lun, fmt, args...)	_LMSG(pr_warn, lun, fmt, ## args)
33 #define LINFO(lun, fmt, args...)	_LMSG(pr_info, lun, fmt, ## args)
34 
35 
36 #ifdef DUMP_MSGS
37 
38 #  define dump_msg(fsg, /* const char * */ label,			\
39 		   /* const u8 * */ buf, /* unsigned */ length)		\
40 do {									\
41 	if (length < 512) {						\
42 		DBG(fsg, "%s, length %u:\n", label, length);		\
43 		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,	\
44 			       16, 1, buf, length, 0);			\
45 	}								\
46 } while (0)
47 
48 #  define dump_cdb(fsg) do { } while (0)
49 
50 #else
51 
52 #  define dump_msg(fsg, /* const char * */ label, \
53 		   /* const u8 * */ buf, /* unsigned */ length) do { } while (0)
54 
55 #  ifdef VERBOSE_DEBUG
56 
57 #    define dump_cdb(fsg)						\
58 	print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,	\
59 		       16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0)		\
60 
61 #  else
62 
63 #    define dump_cdb(fsg) do { } while (0)
64 
65 #  endif /* VERBOSE_DEBUG */
66 
67 #endif /* DUMP_MSGS */
68 
69 /* Length of a SCSI Command Data Block */
70 #define MAX_COMMAND_SIZE	16
71 
72 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
73 #define SS_NO_SENSE				0
74 #define SS_COMMUNICATION_FAILURE		0x040800
75 #define SS_INVALID_COMMAND			0x052000
76 #define SS_INVALID_FIELD_IN_CDB			0x052400
77 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE	0x052100
78 #define SS_LOGICAL_UNIT_NOT_SUPPORTED		0x052500
79 #define SS_MEDIUM_NOT_PRESENT			0x023a00
80 #define SS_MEDIUM_REMOVAL_PREVENTED		0x055302
81 #define SS_NOT_READY_TO_READY_TRANSITION	0x062800
82 #define SS_RESET_OCCURRED			0x062900
83 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED	0x053900
84 #define SS_UNRECOVERED_READ_ERROR		0x031100
85 #define SS_WRITE_ERROR				0x030c02
86 #define SS_WRITE_PROTECTED			0x072700
87 
88 #define SK(x)		((u8) ((x) >> 16))	/* Sense Key byte, etc. */
89 #define ASC(x)		((u8) ((x) >> 8))
90 #define ASCQ(x)		((u8) (x))
91 
92 /*
93  * Vendor (8 chars), product (16 chars), release (4 hexadecimal digits) and NUL
94  * byte
95  */
96 #define INQUIRY_STRING_LEN ((size_t) (8 + 16 + 4 + 1))
97 
98 struct fsg_lun {
99 	struct file	*filp;
100 	loff_t		file_length;
101 	loff_t		num_sectors;
102 
103 	unsigned int	initially_ro:1;
104 	unsigned int	ro:1;
105 	unsigned int	removable:1;
106 	unsigned int	cdrom:1;
107 	unsigned int	prevent_medium_removal:1;
108 	unsigned int	registered:1;
109 	unsigned int	info_valid:1;
110 	unsigned int	nofua:1;
111 
112 	u32		sense_data;
113 	u32		sense_data_info;
114 	u32		unit_attention_data;
115 
116 	unsigned int	blkbits; /* Bits of logical block size
117 						       of bound block device */
118 	unsigned int	blksize; /* logical block size of bound block device */
119 	struct device	dev;
120 	const char	*name;		/* "lun.name" */
121 	const char	**name_pfx;	/* "function.name" */
122 	char		inquiry_string[INQUIRY_STRING_LEN];
123 };
124 
125 static inline bool fsg_lun_is_open(struct fsg_lun *curlun)
126 {
127 	return curlun->filp != NULL;
128 }
129 
130 /* Default size of buffer length. */
131 #define FSG_BUFLEN	((u32)16384)
132 
133 /* Maximal number of LUNs supported in mass storage function */
134 #define FSG_MAX_LUNS	16
135 
136 enum fsg_buffer_state {
137 	BUF_STATE_SENDING = -2,
138 	BUF_STATE_RECEIVING,
139 	BUF_STATE_EMPTY = 0,
140 	BUF_STATE_FULL
141 };
142 
143 struct fsg_buffhd {
144 	void				*buf;
145 	enum fsg_buffer_state		state;
146 	struct fsg_buffhd		*next;
147 
148 	/*
149 	 * The NetChip 2280 is faster, and handles some protocol faults
150 	 * better, if we don't submit any short bulk-out read requests.
151 	 * So we will record the intended request length here.
152 	 */
153 	unsigned int			bulk_out_intended_length;
154 
155 	struct usb_request		*inreq;
156 	struct usb_request		*outreq;
157 };
158 
159 enum fsg_state {
160 	FSG_STATE_NORMAL,
161 	FSG_STATE_ABORT_BULK_OUT,
162 	FSG_STATE_PROTOCOL_RESET,
163 	FSG_STATE_CONFIG_CHANGE,
164 	FSG_STATE_EXIT,
165 	FSG_STATE_TERMINATED
166 };
167 
168 enum data_direction {
169 	DATA_DIR_UNKNOWN = 0,
170 	DATA_DIR_FROM_HOST,
171 	DATA_DIR_TO_HOST,
172 	DATA_DIR_NONE
173 };
174 
175 static inline u32 get_unaligned_be24(u8 *buf)
176 {
177 	return 0xffffff & (u32) get_unaligned_be32(buf - 1);
178 }
179 
180 static inline struct fsg_lun *fsg_lun_from_dev(struct device *dev)
181 {
182 	return container_of(dev, struct fsg_lun, dev);
183 }
184 
185 enum {
186 	FSG_STRING_INTERFACE
187 };
188 
189 extern struct usb_interface_descriptor fsg_intf_desc;
190 
191 extern struct usb_endpoint_descriptor fsg_fs_bulk_in_desc;
192 extern struct usb_endpoint_descriptor fsg_fs_bulk_out_desc;
193 extern struct usb_descriptor_header *fsg_fs_function[];
194 
195 extern struct usb_endpoint_descriptor fsg_hs_bulk_in_desc;
196 extern struct usb_endpoint_descriptor fsg_hs_bulk_out_desc;
197 extern struct usb_descriptor_header *fsg_hs_function[];
198 
199 extern struct usb_endpoint_descriptor fsg_ss_bulk_in_desc;
200 extern struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc;
201 extern struct usb_endpoint_descriptor fsg_ss_bulk_out_desc;
202 extern struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc;
203 extern struct usb_descriptor_header *fsg_ss_function[];
204 
205 void fsg_lun_close(struct fsg_lun *curlun);
206 int fsg_lun_open(struct fsg_lun *curlun, const char *filename);
207 int fsg_lun_fsync_sub(struct fsg_lun *curlun);
208 void store_cdrom_address(u8 *dest, int msf, u32 addr);
209 ssize_t fsg_show_ro(struct fsg_lun *curlun, char *buf);
210 ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf);
211 ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
212 		      char *buf);
213 ssize_t fsg_show_inquiry_string(struct fsg_lun *curlun, char *buf);
214 ssize_t fsg_show_cdrom(struct fsg_lun *curlun, char *buf);
215 ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf);
216 ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
217 		     const char *buf, size_t count);
218 ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count);
219 ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
220 		       const char *buf, size_t count);
221 ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
222 			const char *buf, size_t count);
223 ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf,
224 			    size_t count);
225 ssize_t fsg_store_inquiry_string(struct fsg_lun *curlun, const char *buf,
226 				 size_t count);
227 
228 #endif /* USB_STORAGE_COMMON_H */
229