[people/ms/u-boot.git] / drivers / usb / gadget / storage_common.c

/*
 * storage_common.c -- Common definitions for mass storage functionality
 *
 * Copyright (C) 2003-2008 Alan Stern
 * Copyeight (C) 2009 Samsung Electronics
 * Author: Michal Nazarewicz (m.nazarewicz@samsung.com)
 *
 * Ported to u-boot:
 * Andrzej Pietrasiewicz <andrzej.p@samsung.com>
 *
 * Code refactoring & cleanup:
 * Łukasz Majewski <l.majewski@samsung.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */


/*
 * This file requires the following identifiers used in USB strings to
 * be defined (each of type pointer to char):
 *  - fsg_string_manufacturer -- name of the manufacturer
 *  - fsg_string_product      -- name of the product
 *  - fsg_string_serial       -- product's serial
 *  - fsg_string_config       -- name of the configuration
 *  - fsg_string_interface    -- name of the interface
 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
 * macro is defined prior to including this file.
 */

/*
 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
 * fsg_hs_intr_in_desc objects as well as
 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
 * macros are not defined.
 *
 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
 * defined (as well as corresponding entries in string tables are
 * missing) and FSG_STRING_INTERFACE has value of zero.
 *
 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
 */

/*
 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included
 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN
 * characters rather then a pointer to void.
 */


/* #include <asm/unaligned.h> */


/*
 * Thanks to NetChip Technologies for donating this product ID.
 *
 * DO NOT REUSE THESE IDs with any other driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */
#define FSG_VENDOR_ID	0x0525	/* NetChip */
#define FSG_PRODUCT_ID	0xa4a5	/* Linux-USB File-backed Storage Gadget */

/*-------------------------------------------------------------------------*/

#ifndef DEBUG
#undef VERBOSE_DEBUG
#undef DUMP_MSGS
#endif /* !DEBUG */

#ifdef VERBOSE_DEBUG
#define VLDBG	LDBG
#else
#define VLDBG(lun, fmt, args...) do { } while (0)
#endif /* VERBOSE_DEBUG */

/*
#define LDBG(lun, fmt, args...)   dev_dbg (&(lun)->dev, fmt, ## args)
#define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
#define LWARN(lun, fmt, args...)  dev_warn(&(lun)->dev, fmt, ## args)
#define LINFO(lun, fmt, args...)  dev_info(&(lun)->dev, fmt, ## args)
*/

#define LDBG(lun, fmt, args...) do { } while (0)
#define LERROR(lun, fmt, args...) do { } while (0)
#define LWARN(lun, fmt, args...) do { } while (0)
#define LINFO(lun, fmt, args...) do { } while (0)

/*
 * Keep those macros in sync with those in
 * include/linux/usb/composite.h or else GCC will complain.  If they
 * are identical (the same names of arguments, white spaces in the
 * same places) GCC will allow redefinition otherwise (even if some
 * white space is removed or added) warning will be issued.
 *
 * Those macros are needed here because File Storage Gadget does not
 * include the composite.h header.  For composite gadgets those macros
 * are redundant since composite.h is included any way.
 *
 * One could check whether those macros are already defined (which
 * would indicate composite.h had been included) or not (which would
 * indicate we were in FSG) but this is not done because a warning is
 * desired if definitions here differ from the ones in composite.h.
 *
 * We want the definitions to match and be the same in File Storage
 * Gadget as well as Mass Storage Function (and so composite gadgets
 * using MSF).  If someone changes them in composite.h it will produce
 * a warning in this file when building MSF.
 */

#define DBG(d, fmt, args...)     debug(fmt , ## args)
#define VDBG(d, fmt, args...)    debug(fmt , ## args)
/* #define ERROR(d, fmt, args...)   printf(fmt , ## args) */
/* #define WARNING(d, fmt, args...) printf(fmt , ## args) */
/* #define INFO(d, fmt, args...)    printf(fmt , ## args) */

/* #define DBG(d, fmt, args...)     do { } while (0) */
/* #define VDBG(d, fmt, args...)    do { } while (0) */
#define ERROR(d, fmt, args...)   do { } while (0)
#define WARNING(d, fmt, args...) do { } while (0)
#define INFO(d, fmt, args...)    do { } while (0)

#ifdef DUMP_MSGS

/* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */
# define dump_msg(fsg, label, buf, length) do {                         \
	if (length < 512) {						\
		DBG(fsg, "%s, length %u:\n", label, length);		\
		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,	\
			       16, 1, buf, length, 0);			\
	}								\
} while (0)

#  define dump_cdb(fsg) do { } while (0)

#else

#  define dump_msg(fsg, /* const char * */ label, \
		   /* const u8 * */ buf, /* unsigned */ length) do { } while (0)

#  ifdef VERBOSE_DEBUG

#    define dump_cdb(fsg)						\
	print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE,	\
		       16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0)		\

#  else

#    define dump_cdb(fsg) do { } while (0)

#  endif /* VERBOSE_DEBUG */

#endif /* DUMP_MSGS */

/*-------------------------------------------------------------------------*/

/* SCSI device types */
#define TYPE_DISK	0x00
#define TYPE_CDROM	0x05

/* USB protocol value = the transport method */
#define USB_PR_CBI	0x00		/* Control/Bulk/Interrupt */
#define USB_PR_CB	0x01		/* Control/Bulk w/o interrupt */
#define USB_PR_BULK	0x50		/* Bulk-only */

/* USB subclass value = the protocol encapsulation */
#define USB_SC_RBC	0x01		/* Reduced Block Commands (flash) */
#define USB_SC_8020	0x02		/* SFF-8020i, MMC-2, ATAPI (CD-ROM) */
#define USB_SC_QIC	0x03		/* QIC-157 (tape) */
#define USB_SC_UFI	0x04		/* UFI (floppy) */
#define USB_SC_8070	0x05		/* SFF-8070i (removable) */
#define USB_SC_SCSI	0x06		/* Transparent SCSI */

/* Bulk-only data structures */

/* Command Block Wrapper */
struct fsg_bulk_cb_wrap {
	__le32	Signature;		/* Contains 'USBC' */
	u32	Tag;			/* Unique per command id */
	__le32	DataTransferLength;	/* Size of the data */
	u8	Flags;			/* Direction in bit 7 */
	u8	Lun;			/* LUN (normally 0) */
	u8	Length;			/* Of the CDB, <= MAX_COMMAND_SIZE */
	u8	CDB[16];		/* Command Data Block */
};

#define USB_BULK_CB_WRAP_LEN	31
#define USB_BULK_CB_SIG		0x43425355	/* Spells out USBC */
#define USB_BULK_IN_FLAG	0x80

/* Command Status Wrapper */
struct bulk_cs_wrap {
	__le32	Signature;		/* Should = 'USBS' */
	u32	Tag;			/* Same as original command */
	__le32	Residue;		/* Amount not transferred */
	u8	Status;			/* See below */
};

#define USB_BULK_CS_WRAP_LEN	13
#define USB_BULK_CS_SIG		0x53425355	/* Spells out 'USBS' */
#define USB_STATUS_PASS		0
#define USB_STATUS_FAIL		1
#define USB_STATUS_PHASE_ERROR	2

/* Bulk-only class specific requests */
#define USB_BULK_RESET_REQUEST		0xff
#define USB_BULK_GET_MAX_LUN_REQUEST	0xfe

/* CBI Interrupt data structure */
struct interrupt_data {
	u8	bType;
	u8	bValue;
};

#define CBI_INTERRUPT_DATA_LEN		2

/* CBI Accept Device-Specific Command request */
#define USB_CBI_ADSC_REQUEST		0x00

/* Length of a SCSI Command Data Block */
#define MAX_COMMAND_SIZE	16

/* SCSI commands that we recognize */
#define SC_FORMAT_UNIT			0x04
#define SC_INQUIRY			0x12
#define SC_MODE_SELECT_6		0x15
#define SC_MODE_SELECT_10		0x55
#define SC_MODE_SENSE_6			0x1a
#define SC_MODE_SENSE_10		0x5a
#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL	0x1e
#define SC_READ_6			0x08
#define SC_READ_10			0x28
#define SC_READ_12			0xa8
#define SC_READ_CAPACITY		0x25
#define SC_READ_FORMAT_CAPACITIES	0x23
#define SC_READ_HEADER			0x44
#define SC_READ_TOC			0x43
#define SC_RELEASE			0x17
#define SC_REQUEST_SENSE		0x03
#define SC_RESERVE			0x16
#define SC_SEND_DIAGNOSTIC		0x1d
#define SC_START_STOP_UNIT		0x1b
#define SC_SYNCHRONIZE_CACHE		0x35
#define SC_TEST_UNIT_READY		0x00
#define SC_VERIFY			0x2f
#define SC_WRITE_6			0x0a
#define SC_WRITE_10			0x2a
#define SC_WRITE_12			0xaa

/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
#define SS_NO_SENSE				0
#define SS_COMMUNICATION_FAILURE		0x040800
#define SS_INVALID_COMMAND			0x052000
#define SS_INVALID_FIELD_IN_CDB			0x052400
#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE	0x052100
#define SS_LOGICAL_UNIT_NOT_SUPPORTED		0x052500
#define SS_MEDIUM_NOT_PRESENT			0x023a00
#define SS_MEDIUM_REMOVAL_PREVENTED		0x055302
#define SS_NOT_READY_TO_READY_TRANSITION	0x062800
#define SS_RESET_OCCURRED			0x062900
#define SS_SAVING_PARAMETERS_NOT_SUPPORTED	0x053900
#define SS_UNRECOVERED_READ_ERROR		0x031100
#define SS_WRITE_ERROR				0x030c02
#define SS_WRITE_PROTECTED			0x072700

#define SK(x)		((u8) ((x) >> 16))	/* Sense Key byte, etc. */
#define ASC(x)		((u8) ((x) >> 8))
#define ASCQ(x)		((u8) (x))

struct device_attribute { int i; };
struct rw_semaphore { int i; };
#define down_write(...)			do { } while (0)
#define up_write(...)			do { } while (0)
#define down_read(...)			do { } while (0)
#define up_read(...)			do { } while (0)
#define ETOOSMALL	525

#include <usb_mass_storage.h>

/*-------------------------------------------------------------------------*/

struct fsg_lun {
	loff_t		file_length;
	loff_t		num_sectors;

	unsigned int	initially_ro:1;
	unsigned int	ro:1;
	unsigned int	removable:1;
	unsigned int	cdrom:1;
	unsigned int	prevent_medium_removal:1;
	unsigned int	registered:1;
	unsigned int	info_valid:1;
	unsigned int	nofua:1;

	u32		sense_data;
	u32		sense_data_info;
	u32		unit_attention_data;

	struct device	dev;
};

#define fsg_lun_is_open(curlun)	((curlun)->filp != NULL)
#if 0
static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
{
	return container_of(dev, struct fsg_lun, dev);
}
#endif

/* Big enough to hold our biggest descriptor */
#define EP0_BUFSIZE	256
#define DELAYED_STATUS	(EP0_BUFSIZE + 999)	/* An impossibly large value */

/* Number of buffers we will use.  2 is enough for double-buffering */
#define FSG_NUM_BUFFERS	2

/* Default size of buffer length. */
#define FSG_BUFLEN	((u32)16384)

/* Maximal number of LUNs supported in mass storage function */
#define FSG_MAX_LUNS	8

enum fsg_buffer_state {
	BUF_STATE_EMPTY = 0,
	BUF_STATE_FULL,
	BUF_STATE_BUSY
};

struct fsg_buffhd {
#ifdef FSG_BUFFHD_STATIC_BUFFER
	char				buf[FSG_BUFLEN];
#else
	void				*buf;
#endif
	enum fsg_buffer_state		state;
	struct fsg_buffhd		*next;

	/*
	 * The NetChip 2280 is faster, and handles some protocol faults
	 * better, if we don't submit any short bulk-out read requests.
	 * So we will record the intended request length here.
	 */
	unsigned int			bulk_out_intended_length;

	struct usb_request		*inreq;
	int				inreq_busy;
	struct usb_request		*outreq;
	int				outreq_busy;
};

enum fsg_state {
	/* This one isn't used anywhere */
	FSG_STATE_COMMAND_PHASE = -10,
	FSG_STATE_DATA_PHASE,
	FSG_STATE_STATUS_PHASE,

	FSG_STATE_IDLE = 0,
	FSG_STATE_ABORT_BULK_OUT,
	FSG_STATE_RESET,
	FSG_STATE_INTERFACE_CHANGE,
	FSG_STATE_CONFIG_CHANGE,
	FSG_STATE_DISCONNECT,
	FSG_STATE_EXIT,
	FSG_STATE_TERMINATED
};

enum data_direction {
	DATA_DIR_UNKNOWN = 0,
	DATA_DIR_FROM_HOST,
	DATA_DIR_TO_HOST,
	DATA_DIR_NONE
};

/*-------------------------------------------------------------------------*/

static inline u32 get_unaligned_be24(u8 *buf)
{
	return 0xffffff & (u32) get_unaligned_be32(buf - 1);
}

/*-------------------------------------------------------------------------*/

enum {
#ifndef FSG_NO_DEVICE_STRINGS
	FSG_STRING_MANUFACTURER	= 1,
	FSG_STRING_PRODUCT,
	FSG_STRING_SERIAL,
	FSG_STRING_CONFIG,
#endif
	FSG_STRING_INTERFACE
};

#ifndef FSG_NO_OTG
static struct usb_otg_descriptor
fsg_otg_desc = {
	.bLength =		sizeof fsg_otg_desc,
	.bDescriptorType =	USB_DT_OTG,

	.bmAttributes =		USB_OTG_SRP,
};
#endif

/* There is only one interface. */

static struct usb_interface_descriptor
fsg_intf_desc = {
	.bLength =		sizeof fsg_intf_desc,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bNumEndpoints =	2,		/* Adjusted during fsg_bind() */
	.bInterfaceClass =	USB_CLASS_MASS_STORAGE,
	.bInterfaceSubClass =	USB_SC_SCSI,	/* Adjusted during fsg_bind() */
	.bInterfaceProtocol =	USB_PR_BULK,	/* Adjusted during fsg_bind() */
	.iInterface =		FSG_STRING_INTERFACE,
};

/*
 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
 * interrupt-in.
 */

static struct usb_endpoint_descriptor
fsg_fs_bulk_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	/* wMaxPacketSize set by autoconfiguration */
};

static struct usb_endpoint_descriptor
fsg_fs_bulk_out_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	/* wMaxPacketSize set by autoconfiguration */
};

#ifndef FSG_NO_INTR_EP

static struct usb_endpoint_descriptor
fsg_fs_intr_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	cpu_to_le16(2),
	.bInterval =		32,	/* frames -> 32 ms */
};

#ifndef FSG_NO_OTG
#  define FSG_FS_FUNCTION_PRE_EP_ENTRIES	2
#else
#  define FSG_FS_FUNCTION_PRE_EP_ENTRIES	1
#endif

#endif

static struct usb_descriptor_header *fsg_fs_function[] = {
#ifndef FSG_NO_OTG
	(struct usb_descriptor_header *) &fsg_otg_desc,
#endif
	(struct usb_descriptor_header *) &fsg_intf_desc,
	(struct usb_descriptor_header *) &fsg_fs_bulk_in_desc,
	(struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
#ifndef FSG_NO_INTR_EP
	(struct usb_descriptor_header *) &fsg_fs_intr_in_desc,
#endif
	NULL,
};

/*
 * USB 2.0 devices need to expose both high speed and full speed
 * descriptors, unless they only run at full speed.
 *
 * That means alternate endpoint descriptors (bigger packets)
 * and a "device qualifier" ... plus more construction options
 * for the configuration descriptor.
 */
static struct usb_endpoint_descriptor
fsg_hs_bulk_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	/* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_endpoint_descriptor
fsg_hs_bulk_out_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	/* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
	.bInterval =		1,	/* NAK every 1 uframe */
};

#ifndef FSG_NO_INTR_EP

static struct usb_endpoint_descriptor
fsg_hs_intr_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	/* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	cpu_to_le16(2),
	.bInterval =		9,	/* 2**(9-1) = 256 uframes -> 32 ms */
};

#ifndef FSG_NO_OTG
#  define FSG_HS_FUNCTION_PRE_EP_ENTRIES	2
#else
#  define FSG_HS_FUNCTION_PRE_EP_ENTRIES	1
#endif

#endif

static struct usb_descriptor_header *fsg_hs_function[] = {
#ifndef FSG_NO_OTG
	(struct usb_descriptor_header *) &fsg_otg_desc,
#endif
	(struct usb_descriptor_header *) &fsg_intf_desc,
	(struct usb_descriptor_header *) &fsg_hs_bulk_in_desc,
	(struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
#ifndef FSG_NO_INTR_EP
	(struct usb_descriptor_header *) &fsg_hs_intr_in_desc,
#endif
	NULL,
};

/* Maxpacket and other transfer characteristics vary by speed. */
static struct usb_endpoint_descriptor *
fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
		struct usb_endpoint_descriptor *hs)
{
	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
		return hs;
	return fs;
}

/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
static struct usb_string		fsg_strings[] = {
#ifndef FSG_NO_DEVICE_STRINGS
	{FSG_STRING_MANUFACTURER,	fsg_string_manufacturer},
	{FSG_STRING_PRODUCT,		fsg_string_product},
	{FSG_STRING_SERIAL,		fsg_string_serial},
	{FSG_STRING_CONFIG,		fsg_string_config},
#endif
	{FSG_STRING_INTERFACE,		fsg_string_interface},
	{}
};

static struct usb_gadget_strings	fsg_stringtab = {
	.language	= 0x0409,		/* en-us */
	.strings	= fsg_strings,
};

/*-------------------------------------------------------------------------*/

/*
 * If the next two routines are called while the gadget is registered,
 * the caller must own fsg->filesem for writing.
 */

static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
{
	int				ro;

	/* R/W if we can, R/O if we must */
	ro = curlun->initially_ro;

	curlun->ro = ro;
	curlun->file_length = ums->num_sectors << 9;
	curlun->num_sectors = ums->num_sectors;
	debug("open backing file: %s\n", filename);

	return 0;
}

static void fsg_lun_close(struct fsg_lun *curlun)
{
}

/*-------------------------------------------------------------------------*/

/*
 * Sync the file data, don't bother with the metadata.
 * This code was copied from fs/buffer.c:sys_fdatasync().
 */
static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
{
	return 0;
}

static void store_cdrom_address(u8 *dest, int msf, u32 addr)
{
	if (msf) {
		/* Convert to Minutes-Seconds-Frames */
		addr >>= 2;		/* Convert to 2048-byte frames */
		addr += 2*75;		/* Lead-in occupies 2 seconds */
		dest[3] = addr % 75;	/* Frames */
		addr /= 75;
		dest[2] = addr % 60;	/* Seconds */
		addr /= 60;
		dest[1] = addr;		/* Minutes */
		dest[0] = 0;		/* Reserved */
	} else {
		/* Absolute sector */
		put_unaligned_be32(addr, dest);
	}
}

/*-------------------------------------------------------------------------*/
Commit	Line	Data
dee1d999 ŁM	1	/*
	2	* storage_common.c -- Common definitions for mass storage functionality
	3	*
	4	* Copyright (C) 2003-2008 Alan Stern
	5	* Copyeight (C) 2009 Samsung Electronics
	6	* Author: Michal Nazarewicz (m.nazarewicz@samsung.com)
	7	*
	8	* Ported to u-boot:
	9	* Andrzej Pietrasiewicz <andrzej.p@samsung.com>
	10	*
	11	* Code refactoring & cleanup:
	12	* Łukasz Majewski <l.majewski@samsung.com>
	13	*
1a459660	14	* SPDX-License-Identifier: GPL-2.0+
dee1d999 ŁM	15	*/
	16
	17
	18	/*
	19	* This file requires the following identifiers used in USB strings to
	20	* be defined (each of type pointer to char):
	21	* - fsg_string_manufacturer -- name of the manufacturer
	22	* - fsg_string_product -- name of the product
	23	* - fsg_string_serial -- product's serial
	24	* - fsg_string_config -- name of the configuration
	25	* - fsg_string_interface -- name of the interface
	26	* The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS
	27	* macro is defined prior to including this file.
	28	*/
	29
	30	/*
	31	* When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and
	32	* fsg_hs_intr_in_desc objects as well as
	33	* FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES
	34	* macros are not defined.
	35	*
	36	* When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER,
	37	* FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not
	38	* defined (as well as corresponding entries in string tables are
	39	* missing) and FSG_STRING_INTERFACE has value of zero.
	40	*
	41	* When FSG_NO_OTG is defined fsg_otg_desc won't be defined.
	42	*/
	43
	44	/*
	45	* When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included
	46	* the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN
	47	* characters rather then a pointer to void.
	48	*/
	49
	50
	51	/* #include <asm/unaligned.h> */
	52
	53
	54	/*
	55	* Thanks to NetChip Technologies for donating this product ID.
	56	*
	57	* DO NOT REUSE THESE IDs with any other driver!! Ever!!
	58	* Instead: allocate your own, using normal USB-IF procedures.
	59	*/
	60	#define FSG_VENDOR_ID 0x0525 /* NetChip */
	61	#define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
	62
	63	/-------------------------------------------------------------------------/
	64
	65	#ifndef DEBUG
	66	#undef VERBOSE_DEBUG
	67	#undef DUMP_MSGS
	68	#endif /* !DEBUG */
	69
	70	#ifdef VERBOSE_DEBUG
	71	#define VLDBG LDBG
	72	#else
	73	#define VLDBG(lun, fmt, args...) do { } while (0)
	74	#endif /* VERBOSE_DEBUG */
	75
	76	/*
	77	#define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args)
	78	#define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args)
79	#define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args)
80	#define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args)
81	*/
82
83	#define LDBG(lun, fmt, args...) do { } while (0)
84	#define LERROR(lun, fmt, args...) do { } while (0)
85	#define LWARN(lun, fmt, args...) do { } while (0)
86	#define LINFO(lun, fmt, args...) do { } while (0)
87
88	/*
89	* Keep those macros in sync with those in
90	* include/linux/usb/composite.h or else GCC will complain. If they
91	* are identical (the same names of arguments, white spaces in the
92	* same places) GCC will allow redefinition otherwise (even if some
93	* white space is removed or added) warning will be issued.
94	*
95	* Those macros are needed here because File Storage Gadget does not
96	* include the composite.h header. For composite gadgets those macros
97	* are redundant since composite.h is included any way.
98	*
99	* One could check whether those macros are already defined (which
100	* would indicate composite.h had been included) or not (which would
101	* indicate we were in FSG) but this is not done because a warning is
102	* desired if definitions here differ from the ones in composite.h.
103	*
104	* We want the definitions to match and be the same in File Storage
105	* Gadget as well as Mass Storage Function (and so composite gadgets
106	* using MSF). If someone changes them in composite.h it will produce
107	* a warning in this file when building MSF.
108	*/
109
110	#define DBG(d, fmt, args...) debug(fmt , ## args)
111	#define VDBG(d, fmt, args...) debug(fmt , ## args)
112	/* #define ERROR(d, fmt, args...) printf(fmt , ## args) */
113	/* #define WARNING(d, fmt, args...) printf(fmt , ## args) */
114	/* #define INFO(d, fmt, args...) printf(fmt , ## args) */
115
116	/* #define DBG(d, fmt, args...) do { } while (0) */
117	/* #define VDBG(d, fmt, args...) do { } while (0) */
118	#define ERROR(d, fmt, args...) do { } while (0)
119	#define WARNING(d, fmt, args...) do { } while (0)
120	#define INFO(d, fmt, args...) do { } while (0)
121
122	#ifdef DUMP_MSGS
123
124	/* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */
125	# define dump_msg(fsg, label, buf, length) do { \
126	if (length < 512) { \
127	DBG(fsg, "%s, length %u:\n", label, length); \
128	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, \
129	16, 1, buf, length, 0); \
130	} \
131	} while (0)
132
133	# define dump_cdb(fsg) do { } while (0)
134
135	#else
136
137	# define dump_msg(fsg, /* const char * */ label, \
138	/* const u8 * / buf, / unsigned */ length) do { } while (0)
139
140	# ifdef VERBOSE_DEBUG
141
142	# define dump_cdb(fsg) \
143	print_hex_dump(KERN_DEBUG, "SCSI CDB: ", DUMP_PREFIX_NONE, \
144	16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \
145
146	# else
147
148	# define dump_cdb(fsg) do { } while (0)
149
150	# endif /* VERBOSE_DEBUG */
151
152	#endif /* DUMP_MSGS */
153
154	/-------------------------------------------------------------------------/
155
156	/* SCSI device types */
157	#define TYPE_DISK 0x00
158	#define TYPE_CDROM 0x05
159
160	/* USB protocol value = the transport method */
161	#define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */
162	#define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */
163	#define USB_PR_BULK 0x50 /* Bulk-only */
164
165	/* USB subclass value = the protocol encapsulation */
166	#define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */
167	#define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */
168	#define USB_SC_QIC 0x03 /* QIC-157 (tape) */
169	#define USB_SC_UFI 0x04 /* UFI (floppy) */
170	#define USB_SC_8070 0x05 /* SFF-8070i (removable) */
171	#define USB_SC_SCSI 0x06 /* Transparent SCSI */
172
173	/* Bulk-only data structures */
174
175	/* Command Block Wrapper */
176	struct fsg_bulk_cb_wrap {
177	__le32 Signature; /* Contains 'USBC' */
178	u32 Tag; /* Unique per command id */
179	__le32 DataTransferLength; /* Size of the data */
180	u8 Flags; /* Direction in bit 7 */
181	u8 Lun; /* LUN (normally 0) */
182	u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */
183	u8 CDB[16]; /* Command Data Block */
184	};
185
186	#define USB_BULK_CB_WRAP_LEN 31
187	#define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */
188	#define USB_BULK_IN_FLAG 0x80
189
190	/* Command Status Wrapper */
191	struct bulk_cs_wrap {
192	__le32 Signature; /* Should = 'USBS' */
193	u32 Tag; /* Same as original command */
194	__le32 Residue; /* Amount not transferred */
195	u8 Status; /* See below */
196	};
197
198	#define USB_BULK_CS_WRAP_LEN 13
199	#define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */
200	#define USB_STATUS_PASS 0
201	#define USB_STATUS_FAIL 1
202	#define USB_STATUS_PHASE_ERROR 2
203
204	/* Bulk-only class specific requests */
205	#define USB_BULK_RESET_REQUEST 0xff
206	#define USB_BULK_GET_MAX_LUN_REQUEST 0xfe
207
208	/* CBI Interrupt data structure */
209	struct interrupt_data {
210	u8 bType;
211	u8 bValue;
212	};
213
214	#define CBI_INTERRUPT_DATA_LEN 2
215
216	/* CBI Accept Device-Specific Command request */
217	#define USB_CBI_ADSC_REQUEST 0x00
218
219	/* Length of a SCSI Command Data Block */
220	#define MAX_COMMAND_SIZE 16
221
222	/* SCSI commands that we recognize */
223	#define SC_FORMAT_UNIT 0x04
224	#define SC_INQUIRY 0x12
225	#define SC_MODE_SELECT_6 0x15
226	#define SC_MODE_SELECT_10 0x55
227	#define SC_MODE_SENSE_6 0x1a
228	#define SC_MODE_SENSE_10 0x5a
229	#define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
230	#define SC_READ_6 0x08
231	#define SC_READ_10 0x28
232	#define SC_READ_12 0xa8
233	#define SC_READ_CAPACITY 0x25
234	#define SC_READ_FORMAT_CAPACITIES 0x23
235	#define SC_READ_HEADER 0x44
236	#define SC_READ_TOC 0x43
237	#define SC_RELEASE 0x17
238	#define SC_REQUEST_SENSE 0x03
239	#define SC_RESERVE 0x16
240	#define SC_SEND_DIAGNOSTIC 0x1d
241	#define SC_START_STOP_UNIT 0x1b
242	#define SC_SYNCHRONIZE_CACHE 0x35
243	#define SC_TEST_UNIT_READY 0x00
244	#define SC_VERIFY 0x2f
245	#define SC_WRITE_6 0x0a
246	#define SC_WRITE_10 0x2a
247	#define SC_WRITE_12 0xaa
248
249	/* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */
250	#define SS_NO_SENSE 0
251	#define SS_COMMUNICATION_FAILURE 0x040800
252	#define SS_INVALID_COMMAND 0x052000
253	#define SS_INVALID_FIELD_IN_CDB 0x052400
254	#define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100
255	#define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500
256	#define SS_MEDIUM_NOT_PRESENT 0x023a00
257	#define SS_MEDIUM_REMOVAL_PREVENTED 0x055302
258	#define SS_NOT_READY_TO_READY_TRANSITION 0x062800
259	#define SS_RESET_OCCURRED 0x062900
260	#define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900
261	#define SS_UNRECOVERED_READ_ERROR 0x031100
262	#define SS_WRITE_ERROR 0x030c02
263	#define SS_WRITE_PROTECTED 0x072700
264
265	#define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */
266	#define ASC(x) ((u8) ((x) >> 8))
267	#define ASCQ(x) ((u8) (x))
268
269	struct device_attribute { int i; };
270	struct rw_semaphore { int i; };
271	#define down_write(...) do { } while (0)
272	#define up_write(...) do { } while (0)
273	#define down_read(...) do { } while (0)
274	#define up_read(...) do { } while (0)
275	#define ETOOSMALL 525
276
277	#include <usb_mass_storage.h>
dee1d999 ŁM	278
	279	/-------------------------------------------------------------------------/
	280
	281	struct fsg_lun {
	282	loff_t file_length;
	283	loff_t num_sectors;
	284
	285	unsigned int initially_ro:1;
	286	unsigned int ro:1;
	287	unsigned int removable:1;
	288	unsigned int cdrom:1;
	289	unsigned int prevent_medium_removal:1;
	290	unsigned int registered:1;
	291	unsigned int info_valid:1;
	292	unsigned int nofua:1;
	293
	294	u32 sense_data;
	295	u32 sense_data_info;
	296	u32 unit_attention_data;
	297
	298	struct device dev;
	299	};
	300
	301	#define fsg_lun_is_open(curlun) ((curlun)->filp != NULL)
	302	#if 0
	303	static struct fsg_lun fsg_lun_from_dev(struct device dev)
	304	{
	305	return container_of(dev, struct fsg_lun, dev);
	306	}
	307	#endif
	308
	309	/* Big enough to hold our biggest descriptor */
	310	#define EP0_BUFSIZE 256
	311	#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
	312
	313	/* Number of buffers we will use. 2 is enough for double-buffering */
	314	#define FSG_NUM_BUFFERS 2
	315
	316	/* Default size of buffer length. */
	317	#define FSG_BUFLEN ((u32)16384)
	318
	319	/* Maximal number of LUNs supported in mass storage function */
	320	#define FSG_MAX_LUNS 8
	321
	322	enum fsg_buffer_state {
	323	BUF_STATE_EMPTY = 0,
	324	BUF_STATE_FULL,
	325	BUF_STATE_BUSY
	326	};
	327
	328	struct fsg_buffhd {
	329	#ifdef FSG_BUFFHD_STATIC_BUFFER
	330	char buf[FSG_BUFLEN];
	331	#else
	332	void *buf;
	333	#endif
	334	enum fsg_buffer_state state;
	335	struct fsg_buffhd *next;
	336
	337	/*
	338	* The NetChip 2280 is faster, and handles some protocol faults
	339	* better, if we don't submit any short bulk-out read requests.
	340	* So we will record the intended request length here.
	341	*/
342	unsigned int bulk_out_intended_length;
343
344	struct usb_request *inreq;
345	int inreq_busy;
346	struct usb_request *outreq;
347	int outreq_busy;
348	};
349
350	enum fsg_state {
351	/* This one isn't used anywhere */
352	FSG_STATE_COMMAND_PHASE = -10,
353	FSG_STATE_DATA_PHASE,
354	FSG_STATE_STATUS_PHASE,
355
356	FSG_STATE_IDLE = 0,
357	FSG_STATE_ABORT_BULK_OUT,
358	FSG_STATE_RESET,
359	FSG_STATE_INTERFACE_CHANGE,
360	FSG_STATE_CONFIG_CHANGE,
361	FSG_STATE_DISCONNECT,
362	FSG_STATE_EXIT,
363	FSG_STATE_TERMINATED
364	};
365
366	enum data_direction {
367	DATA_DIR_UNKNOWN = 0,
368	DATA_DIR_FROM_HOST,
369	DATA_DIR_TO_HOST,
370	DATA_DIR_NONE
371	};
372
373	/-------------------------------------------------------------------------/
374
375	static inline u32 get_unaligned_be24(u8 *buf)
376	{
377	return 0xffffff & (u32) get_unaligned_be32(buf - 1);
378	}
379
380	/-------------------------------------------------------------------------/
381
382	enum {
383	#ifndef FSG_NO_DEVICE_STRINGS
384	FSG_STRING_MANUFACTURER = 1,
385	FSG_STRING_PRODUCT,
386	FSG_STRING_SERIAL,
387	FSG_STRING_CONFIG,
388	#endif
389	FSG_STRING_INTERFACE
390	};
391
392	#ifndef FSG_NO_OTG
393	static struct usb_otg_descriptor
394	fsg_otg_desc = {
395	.bLength = sizeof fsg_otg_desc,
396	.bDescriptorType = USB_DT_OTG,
397
398	.bmAttributes = USB_OTG_SRP,
399	};
400	#endif
401
402	/* There is only one interface. */
403
404	static struct usb_interface_descriptor
405	fsg_intf_desc = {
406	.bLength = sizeof fsg_intf_desc,
407	.bDescriptorType = USB_DT_INTERFACE,
408
409	.bNumEndpoints = 2, /* Adjusted during fsg_bind() */
410	.bInterfaceClass = USB_CLASS_MASS_STORAGE,
411	.bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */
412	.bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */
413	.iInterface = FSG_STRING_INTERFACE,
414	};
415
416	/*
417	* Three full-speed endpoint descriptors: bulk-in, bulk-out, and
418	* interrupt-in.
419	*/
420
421	static struct usb_endpoint_descriptor
422	fsg_fs_bulk_in_desc = {
423	.bLength = USB_DT_ENDPOINT_SIZE,
424	.bDescriptorType = USB_DT_ENDPOINT,
425
426	.bEndpointAddress = USB_DIR_IN,
427	.bmAttributes = USB_ENDPOINT_XFER_BULK,
428	/* wMaxPacketSize set by autoconfiguration */
429	};
430
431	static struct usb_endpoint_descriptor
432	fsg_fs_bulk_out_desc = {
433	.bLength = USB_DT_ENDPOINT_SIZE,
434	.bDescriptorType = USB_DT_ENDPOINT,
435
436	.bEndpointAddress = USB_DIR_OUT,
437	.bmAttributes = USB_ENDPOINT_XFER_BULK,
438	/* wMaxPacketSize set by autoconfiguration */
439	};
440
441	#ifndef FSG_NO_INTR_EP
442
443	static struct usb_endpoint_descriptor
444	fsg_fs_intr_in_desc = {
445	.bLength = USB_DT_ENDPOINT_SIZE,
446	.bDescriptorType = USB_DT_ENDPOINT,
447
448	.bEndpointAddress = USB_DIR_IN,
449	.bmAttributes = USB_ENDPOINT_XFER_INT,
450	.wMaxPacketSize = cpu_to_le16(2),
451	.bInterval = 32, /* frames -> 32 ms */
452	};
453
454	#ifndef FSG_NO_OTG
455	# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2
456	#else
457	# define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1
458	#endif
459
460	#endif
461
462	static struct usb_descriptor_header *fsg_fs_function[] = {
463	#ifndef FSG_NO_OTG
464	(struct usb_descriptor_header *) &fsg_otg_desc,
465	#endif
466	(struct usb_descriptor_header *) &fsg_intf_desc,
467	(struct usb_descriptor_header *) &fsg_fs_bulk_in_desc,
468	(struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
469	#ifndef FSG_NO_INTR_EP
470	(struct usb_descriptor_header *) &fsg_fs_intr_in_desc,
471	#endif
472	NULL,
473	};
474
475	/*
476	* USB 2.0 devices need to expose both high speed and full speed
477	* descriptors, unless they only run at full speed.
478	*
479	* That means alternate endpoint descriptors (bigger packets)
480	* and a "device qualifier" ... plus more construction options
481	* for the configuration descriptor.
482	*/
483	static struct usb_endpoint_descriptor
484	fsg_hs_bulk_in_desc = {
485	.bLength = USB_DT_ENDPOINT_SIZE,
486	.bDescriptorType = USB_DT_ENDPOINT,
487
488	/* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */
489	.bmAttributes = USB_ENDPOINT_XFER_BULK,
490	.wMaxPacketSize = cpu_to_le16(512),
491	};
492
493	static struct usb_endpoint_descriptor
494	fsg_hs_bulk_out_desc = {
495	.bLength = USB_DT_ENDPOINT_SIZE,
496	.bDescriptorType = USB_DT_ENDPOINT,
497
498	/* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */
499	.bmAttributes = USB_ENDPOINT_XFER_BULK,
500	.wMaxPacketSize = cpu_to_le16(512),
501	.bInterval = 1, /* NAK every 1 uframe */
502	};
503
504	#ifndef FSG_NO_INTR_EP
505
506	static struct usb_endpoint_descriptor
507	fsg_hs_intr_in_desc = {
508	.bLength = USB_DT_ENDPOINT_SIZE,
509	.bDescriptorType = USB_DT_ENDPOINT,
510
511	/* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */
512	.bmAttributes = USB_ENDPOINT_XFER_INT,
513	.wMaxPacketSize = cpu_to_le16(2),
514	.bInterval = 9, /* 2*(9-1) = 256 uframes -> 32 ms /
515	};
516
517	#ifndef FSG_NO_OTG
518	# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2
519	#else
520	# define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1
521	#endif
522
523	#endif
524
525	static struct usb_descriptor_header *fsg_hs_function[] = {
526	#ifndef FSG_NO_OTG
527	(struct usb_descriptor_header *) &fsg_otg_desc,
528	#endif
529	(struct usb_descriptor_header *) &fsg_intf_desc,
530	(struct usb_descriptor_header *) &fsg_hs_bulk_in_desc,
531	(struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
532	#ifndef FSG_NO_INTR_EP
533	(struct usb_descriptor_header *) &fsg_hs_intr_in_desc,
534	#endif
535	NULL,
536	};
537
538	/* Maxpacket and other transfer characteristics vary by speed. */
539	static struct usb_endpoint_descriptor *
540	fsg_ep_desc(struct usb_gadget g, struct usb_endpoint_descriptor fs,
541	struct usb_endpoint_descriptor *hs)
542	{
543	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
544	return hs;
545	return fs;
546	}
547
548	/* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */
549	static struct usb_string fsg_strings[] = {
550	#ifndef FSG_NO_DEVICE_STRINGS
551	{FSG_STRING_MANUFACTURER, fsg_string_manufacturer},
552	{FSG_STRING_PRODUCT, fsg_string_product},
553	{FSG_STRING_SERIAL, fsg_string_serial},
554	{FSG_STRING_CONFIG, fsg_string_config},
555	#endif
556	{FSG_STRING_INTERFACE, fsg_string_interface},
557	{}
558	};
559
560	static struct usb_gadget_strings fsg_stringtab = {
561	.language = 0x0409, /* en-us */
562	.strings = fsg_strings,
563	};
564
565	/-------------------------------------------------------------------------/
566
567	/*
568	* If the next two routines are called while the gadget is registered,
569	* the caller must own fsg->filesem for writing.
570	*/
571
572	static int fsg_lun_open(struct fsg_lun curlun, const char filename)
573	{
574	int ro;
dee1d999 ŁM	575
	576	/* R/W if we can, R/O if we must */
	577	ro = curlun->initially_ro;
	578
dee1d999	579	curlun->ro = ro;
0697f206 PM	580	curlun->file_length = ums->num_sectors << 9;
0697f206 PM	581	curlun->num_sectors = ums->num_sectors;
dee1d999	582	debug("open backing file: %s\n", filename);
dee1d999	583
0697f206	584	return 0;
dee1d999 ŁM	585	}
	586
	587	static void fsg_lun_close(struct fsg_lun *curlun)
	588	{
	589	}
	590
	591	/-------------------------------------------------------------------------/
	592
	593	/*
	594	* Sync the file data, don't bother with the metadata.
	595	* This code was copied from fs/buffer.c:sys_fdatasync().
	596	*/
	597	static int fsg_lun_fsync_sub(struct fsg_lun *curlun)
	598	{
	599	return 0;
	600	}
	601
	602	static void store_cdrom_address(u8 *dest, int msf, u32 addr)
	603	{
	604	if (msf) {
	605	/* Convert to Minutes-Seconds-Frames */
	606	addr >>= 2; /* Convert to 2048-byte frames */
	607	addr += 275; / Lead-in occupies 2 seconds */
	608	dest[3] = addr % 75; /* Frames */
	609	addr /= 75;
	610	dest[2] = addr % 60; /* Seconds */
	611	addr /= 60;
	612	dest[1] = addr; /* Minutes */
	613	dest[0] = 0; /* Reserved */
	614	} else {
	615	/* Absolute sector */
	616	put_unaligned_be32(addr, dest);
	617	}
	618	}
	619
	620	/-------------------------------------------------------------------------/