[deliverable/linux.git] / drivers / usb / storage / usb.h

/* Driver for USB Mass Storage compliant devices
 * Main Header File
 *
 * $Id: usb.h,v 1.21 2002/04/21 02:57:59 mdharm Exp $
 *
 * Current development and maintenance by:
 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *
 * Initial work by:
 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
 *
 * This driver is based on the 'USB Mass Storage Class' document. This
 * describes in detail the protocol used to communicate with such
 * devices.  Clearly, the designers had SCSI and ATAPI commands in
 * mind when they created this document.  The commands are all very
 * similar to commands in the SCSI-II and ATAPI specifications.
 *
 * It is important to note that in a number of cases this class
 * exhibits class-specific exemptions from the USB specification.
 * Notably the usage of NAK, STALL and ACK differs from the norm, in
 * that they are used to communicate wait, failed and OK on commands.
 *
 * Also, for certain devices, the interrupt endpoint is used to convey
 * status of a command.
 *
 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
 * information about this driver.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _USB_H_
#define _USB_H_

#include <linux/usb.h>
#include <linux/usb_usual.h>
#include <linux/blkdev.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <scsi/scsi_host.h>

struct us_data;
struct scsi_cmnd;

/*
 * Unusual device list definitions 
 */

struct us_unusual_dev {
	const char* vendorName;
	const char* productName;
	__u8  useProtocol;
	__u8  useTransport;
	int (*initFunction)(struct us_data *);
};


/* Dynamic flag definitions: used in set_bit() etc. */
#define US_FLIDX_URB_ACTIVE	18  /* 0x00040000  current_urb is in use  */
#define US_FLIDX_SG_ACTIVE	19  /* 0x00080000  current_sg is in use   */
#define US_FLIDX_ABORTING	20  /* 0x00100000  abort is in progress   */
#define US_FLIDX_DISCONNECTING	21  /* 0x00200000  disconnect in progress */
#define ABORTING_OR_DISCONNECTING	((1UL << US_FLIDX_ABORTING) | \
					 (1UL << US_FLIDX_DISCONNECTING))
#define US_FLIDX_RESETTING	22  /* 0x00400000  device reset in progress */
#define US_FLIDX_TIMED_OUT	23  /* 0x00800000  SCSI midlayer timed out  */


#define USB_STOR_STRING_LEN 32

/*
 * We provide a DMA-mapped I/O buffer for use with small USB transfers.
 * It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
 * 31-byte buffer.  But Freecom needs a 64-byte buffer, so that's the
 * size we'll allocate.
 */

#define US_IOBUF_SIZE		64	/* Size of the DMA-mapped I/O buffer */
#define US_SENSE_SIZE		18	/* Size of the autosense data buffer */

typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
typedef int (*trans_reset)(struct us_data*);
typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
typedef void (*extra_data_destructor)(void *);	/* extra data destructor */
typedef void (*pm_hook)(struct us_data *, int);	/* power management hook */

#define US_SUSPEND	0
#define US_RESUME	1

/* we allocate one of these for every device that we remember */
struct us_data {
	/* The device we're working with
	 * It's important to note:
	 *    (o) you must hold dev_mutex to change pusb_dev
	 */
	struct mutex		dev_mutex;	 /* protect pusb_dev */
	struct usb_device	*pusb_dev;	 /* this usb_device */
	struct usb_interface	*pusb_intf;	 /* this interface */
	struct us_unusual_dev   *unusual_dev;	 /* device-filter entry     */
	unsigned long		flags;		 /* from filter initially */
	unsigned int		send_bulk_pipe;	 /* cached pipe values */
	unsigned int		recv_bulk_pipe;
	unsigned int		send_ctrl_pipe;
	unsigned int		recv_ctrl_pipe;
	unsigned int		recv_intr_pipe;

	/* information about the device */
	char			*transport_name;
	char			*protocol_name;
	__le32			bcs_signature;
	u8			subclass;
	u8			protocol;
	u8			max_lun;

	u8			ifnum;		 /* interface number   */
	u8			ep_bInterval;	 /* interrupt interval */ 

	/* function pointers for this device */
	trans_cmnd		transport;	 /* transport function	   */
	trans_reset		transport_reset; /* transport device reset */
	proto_cmnd		proto_handler;	 /* protocol handler	   */

	/* SCSI interfaces */
	struct scsi_cmnd	*srb;		 /* current srb		*/
	unsigned int		tag;		 /* current dCBWTag	*/

	/* control and bulk communications data */
	struct urb		*current_urb;	 /* USB requests	 */
	struct usb_ctrlrequest	*cr;		 /* control requests	 */
	struct usb_sg_request	current_sg;	 /* scatter-gather req.  */
	unsigned char		*iobuf;		 /* I/O buffer		 */
	unsigned char		*sensebuf;	 /* sense data buffer	 */
	dma_addr_t		cr_dma;		 /* buffer DMA addresses */
	dma_addr_t		iobuf_dma;

	/* mutual exclusion and synchronization structures */
	struct semaphore	sema;		 /* to sleep thread on	    */
	struct completion	notify;		 /* thread begin/end	    */
	wait_queue_head_t	delay_wait;	 /* wait during scan, reset */

	/* subdriver information */
	void			*extra;		 /* Any extra data          */
	extra_data_destructor	extra_destructor;/* extra data destructor   */
#ifdef CONFIG_PM
	pm_hook			suspend_resume_hook;
#endif
};

/* Convert between us_data and the corresponding Scsi_Host */
static inline struct Scsi_Host *us_to_host(struct us_data *us) {
	return container_of((void *) us, struct Scsi_Host, hostdata);
}
static inline struct us_data *host_to_us(struct Scsi_Host *host) {
	return (struct us_data *) host->hostdata;
}

/* Function to fill an inquiry response. See usb.c for details */
extern void fill_inquiry_response(struct us_data *us,
	unsigned char *data, unsigned int data_len);

/* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
 * single queue element srb for write access */
#define scsi_unlock(host)	spin_unlock_irq(host->host_lock)
#define scsi_lock(host)		spin_lock_irq(host->host_lock)

#endif
Commit	Line	Data
1da177e4 LT	1	/* Driver for USB Mass Storage compliant devices
	2	* Main Header File
	3	*
	4	* $Id: usb.h,v 1.21 2002/04/21 02:57:59 mdharm Exp $
	5	*
	6	* Current development and maintenance by:
	7	* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
	8	*
	9	* Initial work by:
	10	* (c) 1999 Michael Gee (michael@linuxspecific.com)
	11	*
	12	* This driver is based on the 'USB Mass Storage Class' document. This
	13	* describes in detail the protocol used to communicate with such
	14	* devices. Clearly, the designers had SCSI and ATAPI commands in
	15	* mind when they created this document. The commands are all very
	16	* similar to commands in the SCSI-II and ATAPI specifications.
	17	*
	18	* It is important to note that in a number of cases this class
	19	* exhibits class-specific exemptions from the USB specification.
	20	* Notably the usage of NAK, STALL and ACK differs from the norm, in
	21	* that they are used to communicate wait, failed and OK on commands.
	22	*
	23	* Also, for certain devices, the interrupt endpoint is used to convey
	24	* status of a command.
	25	*
	26	* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
	27	* information about this driver.
	28	*
	29	* This program is free software; you can redistribute it and/or modify it
	30	* under the terms of the GNU General Public License as published by the
	31	* Free Software Foundation; either version 2, or (at your option) any
	32	* later version.
	33	*
	34	* This program is distributed in the hope that it will be useful, but
	35	* WITHOUT ANY WARRANTY; without even the implied warranty of
	36	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	37	* General Public License for more details.
	38	*
	39	* You should have received a copy of the GNU General Public License along
	40	* with this program; if not, write to the Free Software Foundation, Inc.,
	41	* 675 Mass Ave, Cambridge, MA 02139, USA.
	42	*/
	43
	44	#ifndef _USB_H_
	45	#define _USB_H_
	46
	47	#include <linux/usb.h>
a00828e9	48	#include <linux/usb_usual.h>
1da177e4 LT	49	#include <linux/blkdev.h>
	50	#include <linux/smp_lock.h>
	51	#include <linux/completion.h>
4186ecf8	52	#include <linux/mutex.h>
1da177e4 LT	53	#include <scsi/scsi_host.h>
	54
	55	struct us_data;
	56	struct scsi_cmnd;
	57
	58	/*
	59	* Unusual device list definitions
	60	*/
	61
	62	struct us_unusual_dev {
	63	const char* vendorName;
	64	const char* productName;
	65	__u8 useProtocol;
	66	__u8 useTransport;
	67	int (initFunction)(struct us_data );
1da177e4 LT	68	};
1da177e4 LT	69
1da177e4 LT	70
	71	/* Dynamic flag definitions: used in set_bit() etc. */
	72	#define US_FLIDX_URB_ACTIVE 18 /* 0x00040000 current_urb is in use */
	73	#define US_FLIDX_SG_ACTIVE 19 /* 0x00080000 current_sg is in use */
	74	#define US_FLIDX_ABORTING 20 /* 0x00100000 abort is in progress */
	75	#define US_FLIDX_DISCONNECTING 21 /* 0x00200000 disconnect in progress */
	76	#define ABORTING_OR_DISCONNECTING ((1UL << US_FLIDX_ABORTING) \| \
	77	(1UL << US_FLIDX_DISCONNECTING))
	78	#define US_FLIDX_RESETTING 22 /* 0x00400000 device reset in progress */
	79	#define US_FLIDX_TIMED_OUT 23 /* 0x00800000 SCSI midlayer timed out */
	80
	81
	82	#define USB_STOR_STRING_LEN 32
	83
	84	/*
	85	* We provide a DMA-mapped I/O buffer for use with small USB transfers.
	86	* It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
	87	* 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
	88	* size we'll allocate.
	89	*/
	90
	91	#define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
bbafa466	92	#define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
1da177e4 LT	93
	94	typedef int (trans_cmnd)(struct scsi_cmnd , struct us_data*);
	95	typedef int (trans_reset)(struct us_data);
	96	typedef void (proto_cmnd)(struct scsi_cmnd, struct us_data*);
7931e1c6 MD	97	typedef void (extra_data_destructor)(void ); /* extra data destructor */
	98	typedef void (pm_hook)(struct us_data , int); /* power management hook */
	99
	100	#define US_SUSPEND 0
	101	#define US_RESUME 1
1da177e4 LT	102
	103	/* we allocate one of these for every device that we remember */
	104	struct us_data {
	105	/* The device we're working with
	106	* It's important to note:
4186ecf8	107	* (o) you must hold dev_mutex to change pusb_dev
1da177e4	108	*/
4186ecf8	109	struct mutex dev_mutex; /* protect pusb_dev */
1da177e4 LT	110	struct usb_device pusb_dev; / this usb_device */
	111	struct usb_interface pusb_intf; / this interface */
	112	struct us_unusual_dev unusual_dev; / device-filter entry */
	113	unsigned long flags; /* from filter initially */
	114	unsigned int send_bulk_pipe; /* cached pipe values */
	115	unsigned int recv_bulk_pipe;
	116	unsigned int send_ctrl_pipe;
	117	unsigned int recv_ctrl_pipe;
	118	unsigned int recv_intr_pipe;
	119
	120	/* information about the device */
	121	char *transport_name;
	122	char *protocol_name;
	123	__le32 bcs_signature;
	124	u8 subclass;
	125	u8 protocol;
	126	u8 max_lun;
	127
	128	u8 ifnum; /* interface number */
	129	u8 ep_bInterval; /* interrupt interval */
	130
	131	/* function pointers for this device */
	132	trans_cmnd transport; /* transport function */
	133	trans_reset transport_reset; /* transport device reset */
	134	proto_cmnd proto_handler; /* protocol handler */
	135
	136	/* SCSI interfaces */
	137	struct scsi_cmnd srb; / current srb */
0f64e078	138	unsigned int tag; /* current dCBWTag */
1da177e4	139
1da177e4 LT	140	/* control and bulk communications data */
	141	struct urb current_urb; / USB requests */
	142	struct usb_ctrlrequest cr; / control requests */
	143	struct usb_sg_request current_sg; /* scatter-gather req. */
	144	unsigned char iobuf; / I/O buffer */
bbafa466	145	unsigned char sensebuf; / sense data buffer */
1da177e4 LT	146	dma_addr_t cr_dma; /* buffer DMA addresses */
	147	dma_addr_t iobuf_dma;
	148
	149	/* mutual exclusion and synchronization structures */
	150	struct semaphore sema; /* to sleep thread on */
	151	struct completion notify; /* thread begin/end */
	152	wait_queue_head_t delay_wait; /* wait during scan, reset */
	153
	154	/* subdriver information */
	155	void extra; / Any extra data */
	156	extra_data_destructor extra_destructor;/* extra data destructor */
7931e1c6 MD	157	#ifdef CONFIG_PM
	158	pm_hook suspend_resume_hook;
	159	#endif
1da177e4 LT	160	};
	161
	162	/* Convert between us_data and the corresponding Scsi_Host */
f274afc9	163	static inline struct Scsi_Host us_to_host(struct us_data us) {
1da177e4 LT	164	return container_of((void *) us, struct Scsi_Host, hostdata);
1da177e4 LT	165	}
f274afc9	166	static inline struct us_data host_to_us(struct Scsi_Host host) {
1da177e4 LT	167	return (struct us_data *) host->hostdata;
	168	}
	169
	170	/* Function to fill an inquiry response. See usb.c for details */
	171	extern void fill_inquiry_response(struct us_data *us,
	172	unsigned char *data, unsigned int data_len);
	173
	174	/* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
	175	* single queue element srb for write access */
	176	#define scsi_unlock(host) spin_unlock_irq(host->host_lock)
	177	#define scsi_lock(host) spin_lock_irq(host->host_lock)
	178
1da177e4	179	#endif