[deliverable/linux.git] / drivers / staging / keucr / scsiglue.c

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_devinfo.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>

#include "usb.h"
#include "scsiglue.h"
#include "transport.h"

/* Host functions */
/*
 * host_info()
 */
static const char *host_info(struct Scsi_Host *host)
{
	/* pr_info("scsiglue --- host_info\n"); */
	return "SCSI emulation for USB Mass Storage devices";
}

/*
 * slave_alloc()
 */
static int slave_alloc(struct scsi_device *sdev)
{
	struct us_data *us = host_to_us(sdev->host);

	/* pr_info("scsiglue --- slave_alloc\n"); */
	sdev->inquiry_len = 36;

	blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));

	if (us->subclass == USB_SC_UFI)
		sdev->sdev_target->pdt_1f_for_no_lun = 1;

	return 0;
}

/*
 * slave_configure()
 */
static int slave_configure(struct scsi_device *sdev)
{
	struct us_data *us = host_to_us(sdev->host);

	/* pr_info("scsiglue --- slave_configure\n"); */
	if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
		unsigned int max_sectors = 64;

		if (us->fflags & US_FL_MAX_SECTORS_MIN)
			max_sectors = PAGE_CACHE_SIZE >> 9;
		if (queue_max_sectors(sdev->request_queue) > max_sectors)
			blk_queue_max_hw_sectors(sdev->request_queue,
					      max_sectors);
	}

	if (sdev->type == TYPE_DISK) {
		if (us->subclass != USB_SC_SCSI &&
			us->subclass != USB_SC_CYP_ATACB)
			sdev->use_10_for_ms = 1;
		sdev->use_192_bytes_for_3f = 1;
		if (us->fflags & US_FL_NO_WP_DETECT)
			sdev->skip_ms_page_3f = 1;
		sdev->skip_ms_page_8 = 1;
		if (us->fflags & US_FL_FIX_CAPACITY)
			sdev->fix_capacity = 1;
		if (us->fflags & US_FL_CAPACITY_HEURISTICS)
			sdev->guess_capacity = 1;
		if (sdev->scsi_level > SCSI_2)
			sdev->sdev_target->scsi_level = sdev->scsi_level
								= SCSI_2;
		sdev->retry_hwerror = 1;
		sdev->allow_restart = 1;
		sdev->last_sector_bug = 1;
	} else {
		sdev->use_10_for_ms = 1;
	}

	if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
					sdev->scsi_level == SCSI_UNKNOWN)
		us->max_lun = 0;

	if (us->fflags & US_FL_NOT_LOCKABLE)
		sdev->lockable = 0;

	return 0;
}

/* This is always called with scsi_lock(host) held */
/*
 * queuecommand()
 */
static int queuecommand_lck(struct scsi_cmnd *srb,
				void (*done)(struct scsi_cmnd *))
{
	struct us_data *us = host_to_us(srb->device->host);

	/* pr_info("scsiglue --- queuecommand\n"); */

	/* check for state-transition errors */
	if (us->srb != NULL) {
		/* pr_info("Error in %s: us->srb = %p\n"
				 __func__, us->srb); */
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	/* fail the command if we are disconnecting */
	if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
		pr_info("Fail command during disconnect\n");
		srb->result = DID_NO_CONNECT << 16;
		done(srb);
		return 0;
	}

	/* enqueue the command and wake up the control thread */
	srb->scsi_done = done;
	us->srb = srb;
	complete(&us->cmnd_ready);

	return 0;
}

static DEF_SCSI_QCMD(queuecommand)

/***********************************************************************
 * Error handling functions
 ***********************************************************************/

/* Command timeout and abort */
/*
 * command_abort()
 */
static int command_abort(struct scsi_cmnd *srb)
{
	struct us_data *us = host_to_us(srb->device->host);

	/* pr_info("scsiglue --- command_abort\n"); */

	scsi_lock(us_to_host(us));
	if (us->srb != srb) {
		scsi_unlock(us_to_host(us));
		dev_info(&us->pusb_dev->dev, "-- nothing to abort\n");
		return FAILED;
	}

	set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
	if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
		set_bit(US_FLIDX_ABORTING, &us->dflags);
		usb_stor_stop_transport(us);
	}
	scsi_unlock(us_to_host(us));

	/* Wait for the aborted command to finish */
	wait_for_completion(&us->notify);
	return SUCCESS;
}

/* This invokes the transport reset mechanism to reset the state of the
 * device.
 */
/*
 * device_reset()
 */
static int device_reset(struct scsi_cmnd *srb)
{
	struct us_data *us = host_to_us(srb->device->host);
	int result;

	/* pr_info("scsiglue --- device_reset\n"); */

	/* lock the device pointers and do the reset */
	mutex_lock(&(us->dev_mutex));
	result = us->transport_reset(us);
	mutex_unlock(&us->dev_mutex);

	return result < 0 ? FAILED : SUCCESS;
}

/*
 * bus_reset()
 */
static int bus_reset(struct scsi_cmnd *srb)
{
	struct us_data *us = host_to_us(srb->device->host);
	int result;

	/* pr_info("scsiglue --- bus_reset\n"); */
	result = usb_stor_port_reset(us);
	return result < 0 ? FAILED : SUCCESS;
}

/*
 * usb_stor_report_device_reset()
 */
void usb_stor_report_device_reset(struct us_data *us)
{
	int i;
	struct Scsi_Host *host = us_to_host(us);

	/* pr_info("scsiglue --- usb_stor_report_device_reset\n"); */
	scsi_report_device_reset(host, 0, 0);
	if (us->fflags & US_FL_SCM_MULT_TARG) {
		for (i = 1; i < host->max_id; ++i)
			scsi_report_device_reset(host, 0, i);
	}
}

/*
 * usb_stor_report_bus_reset()
 */
void usb_stor_report_bus_reset(struct us_data *us)
{
	struct Scsi_Host *host = us_to_host(us);

	/* pr_info("scsiglue --- usb_stor_report_bus_reset\n"); */
	scsi_lock(host);
	scsi_report_bus_reset(host, 0);
	scsi_unlock(host);
}

/***********************************************************************
 * /proc/scsi/ functions
 ***********************************************************************/

/* we use this macro to help us write into the buffer */
#undef SPRINTF
#define SPRINTF(args...) seq_printf(m, ##args)

static int write_info(struct Scsi_Host *host, char *buffer, int length)
{
	return length;
}

static int show_info(struct seq_file *m, struct Scsi_Host *host)
{
	struct us_data *us = host_to_us(host);
	const char *string;

	/* print the controller name */
	SPRINTF("   Host scsi%d: usb-storage\n", host->host_no);

	/* print product, vendor, and serial number strings */
	if (us->pusb_dev->manufacturer)
		string = us->pusb_dev->manufacturer;
	else if (us->unusual_dev->vendorName)
		string = us->unusual_dev->vendorName;
	else
		string = "Unknown";
	SPRINTF("       Vendor: %s\n", string);
	if (us->pusb_dev->product)
		string = us->pusb_dev->product;
	else if (us->unusual_dev->productName)
		string = us->unusual_dev->productName;
	else
		string = "Unknown";
	SPRINTF("      Product: %s\n", string);
	if (us->pusb_dev->serial)
		string = us->pusb_dev->serial;
	else
		string = "None";
	SPRINTF("Serial Number: %s\n", string);

	/* show the protocol and transport */
	SPRINTF("     Protocol: %s\n", us->protocol_name);
	SPRINTF("    Transport: %s\n", us->transport_name);

	/* show the device flags */
	SPRINTF("       Quirks:");

#define US_FLAG(name, value) \
	do { \
		if (us->fflags & value) \
			SPRINTF(" " #name); \
	} while (0);
US_DO_ALL_FLAGS
#undef US_FLAG
	seq_putc(m, '\n');
	return 0;
}

/***********************************************************************
 * Sysfs interface
 ***********************************************************************/

/* Output routine for the sysfs max_sectors file */
static ssize_t max_sectors_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct scsi_device *sdev = to_scsi_device(dev);

	/* pr_info("scsiglue --- ssize_t show_max_sectors\n"); */
	return sprintf(buf, "%u\n", queue_max_sectors(sdev->request_queue));
}

/* Input routine for the sysfs max_sectors file */
static ssize_t max_sectors_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct scsi_device *sdev = to_scsi_device(dev);
	unsigned short ms;

	/* pr_info("scsiglue --- ssize_t store_max_sectors\n"); */
	if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) {
		blk_queue_max_hw_sectors(sdev->request_queue, ms);
		return strlen(buf);
	}
	return -EINVAL;
}
static DEVICE_ATTR_RW(max_sectors);

static struct device_attribute *sysfs_device_attr_list[] = {
	&dev_attr_max_sectors, NULL,
};

/* this defines our host template, with which we'll allocate hosts */

/*
 * usb_stor_host_template()
 */
struct scsi_host_template usb_stor_host_template = {
	/* basic userland interface stuff */
	.name =				"eucr-storage",
	.proc_name =			"eucr-storage",
	.write_info =			write_info,
	.show_info =			show_info,
	.info =				host_info,

	/* command interface -- queued only */
	.queuecommand =			queuecommand,

	/* error and abort handlers */
	.eh_abort_handler =		command_abort,
	.eh_device_reset_handler =	device_reset,
	.eh_bus_reset_handler =		bus_reset,

	/* queue commands only, only one command per LUN */
	.can_queue =			1,
	.cmd_per_lun =			1,

	/* unknown initiator id */
	.this_id =			-1,

	.slave_alloc =			slave_alloc,
	.slave_configure =		slave_configure,

	/* lots of sg segments can be handled */
	.sg_tablesize =			SG_ALL,

	/* limit the total size of a transfer to 120 KB */
	.max_sectors =                  240,

	/* merge commands... this seems to help performance, but
	 * periodically someone should test to see which setting is more
	 * optimal.
	 */
	.use_clustering =		1,

	/* emulated HBA */
	.emulated =			1,

	/* we do our own delay after a device or bus reset */
	.skip_settle_delay =		1,

	/* sysfs device attributes */
	.sdev_attrs =			sysfs_device_attr_list,

	/* module management */
	.module =			THIS_MODULE
};

/* To Report "Illegal Request: Invalid Field in CDB */
unsigned char usb_stor_sense_invalidCDB[18] = {
	[0]	= 0x70,			    /* current error */
	[2]	= ILLEGAL_REQUEST,	    /* Illegal Request = 0x05 */
	[7]	= 0x0a,			    /* additional length */
	[12]	= 0x24			    /* Invalid Field in CDB */
};

/***********************************************************************
 * Scatter-gather transfer buffer access routines
 ***********************************************************************/

/*
 * usb_stor_access_xfer_buf()
 */
unsigned int usb_stor_access_xfer_buf(struct us_data *us,
	unsigned char *buffer, unsigned int buflen,
	struct scsi_cmnd *srb, struct scatterlist **sgptr,
	unsigned int *offset, enum xfer_buf_dir dir)
{
	unsigned int cnt;

	/* pr_info("transport --- usb_stor_access_xfer_buf\n"); */
	struct scatterlist *sg = *sgptr;

	if (!sg)
		sg = scsi_sglist(srb);

	cnt = 0;
	while (cnt < buflen && sg) {
		struct page *page = sg_page(sg) +
					((sg->offset + *offset) >> PAGE_SHIFT);
		unsigned int poff = (sg->offset + *offset) & (PAGE_SIZE-1);
		unsigned int sglen = sg->length - *offset;

		if (sglen > buflen - cnt) {
			/* Transfer ends within this s-g entry */
			sglen = buflen - cnt;
			*offset += sglen;
		} else {
			/* Transfer continues to next s-g entry */
			*offset = 0;
			sg = sg_next(sg);
		}

		while (sglen > 0) {
			unsigned int plen = min(sglen,
					(unsigned int)PAGE_SIZE - poff);
			unsigned char *ptr = kmap(page);

			if (dir == TO_XFER_BUF)
				memcpy(ptr + poff, buffer + cnt, plen);
			else
				memcpy(buffer + cnt, ptr + poff, plen);
			kunmap(page);

			/* Start at the beginning of the next page */
			poff = 0;
			++page;
			cnt += plen;
			sglen -= plen;
		}
	}
	*sgptr = sg;

	/* Return the amount actually transferred */
	return cnt;
}

/*
 * Store the contents of buffer into srb's transfer
 * buffer and set the SCSI residue.
 */
/*
 * usb_stor_set_xfer_buf()
 */
void usb_stor_set_xfer_buf(struct us_data *us, unsigned char *buffer,
		unsigned int buflen, struct scsi_cmnd *srb, unsigned int dir)
{
	unsigned int offset = 0;
	struct scatterlist *sg = NULL;

	/* pr_info("transport --- usb_stor_set_xfer_buf\n"); */
	/* TO_XFER_BUF = 0, FROM_XFER_BUF = 1 */
	buflen = min(buflen, scsi_bufflen(srb));
	buflen = usb_stor_access_xfer_buf(us, buffer, buflen, srb,
						&sg, &offset, dir);
	if (buflen < scsi_bufflen(srb))
		scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
}
Commit	Line	Data
beddfe84 CYC	1	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
beddfe84 CYC	2
126bb03b AC	3	#include <linux/slab.h>
	4	#include <linux/module.h>
	5	#include <linux/mutex.h>
	6
	7	#include <scsi/scsi.h>
	8	#include <scsi/scsi_cmnd.h>
	9	#include <scsi/scsi_devinfo.h>
	10	#include <scsi/scsi_device.h>
	11	#include <scsi/scsi_eh.h>
	12
	13	#include "usb.h"
	14	#include "scsiglue.h"
	15	#include "transport.h"
	16
	17	/* Host functions */
8a25a2cf CYC	18	/*
	19	* host_info()
	20	*/
	21	static const char host_info(struct Scsi_Host host)
126bb03b	22	{
beddfe84	23	/* pr_info("scsiglue --- host_info\n"); */
126bb03b AC	24	return "SCSI emulation for USB Mass Storage devices";
	25	}
	26
8a25a2cf CYC	27	/*
	28	* slave_alloc()
	29	*/
126bb03b AC	30	static int slave_alloc(struct scsi_device *sdev)
	31	{
	32	struct us_data *us = host_to_us(sdev->host);
	33
beddfe84	34	/* pr_info("scsiglue --- slave_alloc\n"); */
126bb03b AC	35	sdev->inquiry_len = 36;
	36
	37	blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
	38
bceadddd	39	if (us->subclass == USB_SC_UFI)
126bb03b AC	40	sdev->sdev_target->pdt_1f_for_no_lun = 1;
	41
	42	return 0;
	43	}
	44
8a25a2cf CYC	45	/*
	46	* slave_configure()
	47	*/
126bb03b AC	48	static int slave_configure(struct scsi_device *sdev)
	49	{
	50	struct us_data *us = host_to_us(sdev->host);
	51
beddfe84	52	/* pr_info("scsiglue --- slave_configure\n"); */
8a25a2cf	53	if (us->fflags & (US_FL_MAX_SECTORS_64 \| US_FL_MAX_SECTORS_MIN)) {
126bb03b AC	54	unsigned int max_sectors = 64;
	55
	56	if (us->fflags & US_FL_MAX_SECTORS_MIN)
	57	max_sectors = PAGE_CACHE_SIZE >> 9;
	58	if (queue_max_sectors(sdev->request_queue) > max_sectors)
	59	blk_queue_max_hw_sectors(sdev->request_queue,
	60	max_sectors);
	61	}
	62
8a25a2cf CYC	63	if (sdev->type == TYPE_DISK) {
	64	if (us->subclass != USB_SC_SCSI &&
	65	us->subclass != USB_SC_CYP_ATACB)
126bb03b AC	66	sdev->use_10_for_ms = 1;
	67	sdev->use_192_bytes_for_3f = 1;
	68	if (us->fflags & US_FL_NO_WP_DETECT)
	69	sdev->skip_ms_page_3f = 1;
	70	sdev->skip_ms_page_8 = 1;
	71	if (us->fflags & US_FL_FIX_CAPACITY)
	72	sdev->fix_capacity = 1;
	73	if (us->fflags & US_FL_CAPACITY_HEURISTICS)
	74	sdev->guess_capacity = 1;
	75	if (sdev->scsi_level > SCSI_2)
b9594b81 AG	76	sdev->sdev_target->scsi_level = sdev->scsi_level
b9594b81 AG	77	= SCSI_2;
126bb03b AC	78	sdev->retry_hwerror = 1;
	79	sdev->allow_restart = 1;
	80	sdev->last_sector_bug = 1;
8a25a2cf	81	} else {
126bb03b AC	82	sdev->use_10_for_ms = 1;
	83	}
	84
8a25a2cf CYC	85	if ((us->protocol == USB_PR_CB \|\| us->protocol == USB_PR_CBI) &&
8a25a2cf CYC	86	sdev->scsi_level == SCSI_UNKNOWN)
126bb03b AC	87	us->max_lun = 0;
	88
	89	if (us->fflags & US_FL_NOT_LOCKABLE)
	90	sdev->lockable = 0;
	91
	92	return 0;
	93	}
	94
	95	/* This is always called with scsi_lock(host) held */
8a25a2cf CYC	96	/*
	97	* queuecommand()
	98	*/
	99	static int queuecommand_lck(struct scsi_cmnd *srb,
	100	void (done)(struct scsi_cmnd ))
126bb03b AC	101	{
	102	struct us_data *us = host_to_us(srb->device->host);
	103
beddfe84	104	/* pr_info("scsiglue --- queuecommand\n"); */
126bb03b AC	105
126bb03b AC	106	/* check for state-transition errors */
8a25a2cf	107	if (us->srb != NULL) {
beddfe84	108	/* pr_info("Error in %s: us->srb = %p\n"
f8628a47	109	__func__, us->srb); */
126bb03b AC	110	return SCSI_MLQUEUE_HOST_BUSY;
	111	}
	112
	113	/* fail the command if we are disconnecting */
8a25a2cf	114	if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
beddfe84	115	pr_info("Fail command during disconnect\n");
126bb03b AC	116	srb->result = DID_NO_CONNECT << 16;
	117	done(srb);
	118	return 0;
	119	}
	120
	121	/* enqueue the command and wake up the control thread */
	122	srb->scsi_done = done;
	123	us->srb = srb;
	124	complete(&us->cmnd_ready);
	125
	126	return 0;
	127	}
	128
f281233d JG	129	static DEF_SCSI_QCMD(queuecommand)
f281233d JG	130
126bb03b AC	131	/***********************************************************************
	132	* Error handling functions
	133	***********************************************************************/
	134
	135	/* Command timeout and abort */
8a25a2cf CYC	136	/*
	137	* command_abort()
	138	*/
126bb03b AC	139	static int command_abort(struct scsi_cmnd *srb)
	140	{
	141	struct us_data *us = host_to_us(srb->device->host);
	142
beddfe84	143	/* pr_info("scsiglue --- command_abort\n"); */
126bb03b AC	144
126bb03b AC	145	scsi_lock(us_to_host(us));
8a25a2cf	146	if (us->srb != srb) {
126bb03b	147	scsi_unlock(us_to_host(us));
29b31420	148	dev_info(&us->pusb_dev->dev, "-- nothing to abort\n");
126bb03b AC	149	return FAILED;
	150	}
	151
	152	set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
8a25a2cf	153	if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
126bb03b AC	154	set_bit(US_FLIDX_ABORTING, &us->dflags);
	155	usb_stor_stop_transport(us);
	156	}
	157	scsi_unlock(us_to_host(us));
	158
	159	/* Wait for the aborted command to finish */
	160	wait_for_completion(&us->notify);
	161	return SUCCESS;
	162	}
	163
8a25a2cf CYC	164	/* This invokes the transport reset mechanism to reset the state of the
	165	* device.
	166	*/
	167	/*
	168	* device_reset()
	169	*/
126bb03b AC	170	static int device_reset(struct scsi_cmnd *srb)
	171	{
	172	struct us_data *us = host_to_us(srb->device->host);
	173	int result;
	174
beddfe84	175	/* pr_info("scsiglue --- device_reset\n"); */
126bb03b AC	176
	177	/* lock the device pointers and do the reset */
	178	mutex_lock(&(us->dev_mutex));
	179	result = us->transport_reset(us);
	180	mutex_unlock(&us->dev_mutex);
	181
	182	return result < 0 ? FAILED : SUCCESS;
	183	}
	184
8a25a2cf CYC	185	/*
	186	* bus_reset()
	187	*/
126bb03b AC	188	static int bus_reset(struct scsi_cmnd *srb)
	189	{
	190	struct us_data *us = host_to_us(srb->device->host);
	191	int result;
	192
beddfe84	193	/* pr_info("scsiglue --- bus_reset\n"); */
126bb03b AC	194	result = usb_stor_port_reset(us);
	195	return result < 0 ? FAILED : SUCCESS;
	196	}
	197
8a25a2cf CYC	198	/*
	199	* usb_stor_report_device_reset()
	200	*/
126bb03b AC	201	void usb_stor_report_device_reset(struct us_data *us)
	202	{
	203	int i;
	204	struct Scsi_Host *host = us_to_host(us);
	205
beddfe84	206	/* pr_info("scsiglue --- usb_stor_report_device_reset\n"); */
126bb03b	207	scsi_report_device_reset(host, 0, 0);
8a25a2cf	208	if (us->fflags & US_FL_SCM_MULT_TARG) {
126bb03b AC	209	for (i = 1; i < host->max_id; ++i)
	210	scsi_report_device_reset(host, 0, i);
	211	}
	212	}
	213
8a25a2cf CYC	214	/*
	215	* usb_stor_report_bus_reset()
	216	*/
126bb03b AC	217	void usb_stor_report_bus_reset(struct us_data *us)
	218	{
	219	struct Scsi_Host *host = us_to_host(us);
	220
beddfe84	221	/* pr_info("scsiglue --- usb_stor_report_bus_reset\n"); */
126bb03b AC	222	scsi_lock(host);
	223	scsi_report_bus_reset(host, 0);
	224	scsi_unlock(host);
	225	}
	226
	227	/***********************************************************************
	228	* /proc/scsi/ functions
	229	***********************************************************************/
	230
	231	/* we use this macro to help us write into the buffer */
	232	#undef SPRINTF
60e8b807	233	#define SPRINTF(args...) seq_printf(m, ##args)
126bb03b	234
60e8b807 AV	235	static int write_info(struct Scsi_Host host, char buffer, int length)
	236	{
	237	return length;
	238	}
	239
	240	static int show_info(struct seq_file m, struct Scsi_Host host)
126bb03b AC	241	{
126bb03b AC	242	struct us_data *us = host_to_us(host);
126bb03b AC	243	const char *string;
126bb03b AC	244
126bb03b AC	245	/* print the controller name */
	246	SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
	247
	248	/* print product, vendor, and serial number strings */
	249	if (us->pusb_dev->manufacturer)
	250	string = us->pusb_dev->manufacturer;
	251	else if (us->unusual_dev->vendorName)
	252	string = us->unusual_dev->vendorName;
	253	else
	254	string = "Unknown";
	255	SPRINTF(" Vendor: %s\n", string);
	256	if (us->pusb_dev->product)
	257	string = us->pusb_dev->product;
	258	else if (us->unusual_dev->productName)
	259	string = us->unusual_dev->productName;
	260	else
	261	string = "Unknown";
	262	SPRINTF(" Product: %s\n", string);
	263	if (us->pusb_dev->serial)
	264	string = us->pusb_dev->serial;
	265	else
	266	string = "None";
	267	SPRINTF("Serial Number: %s\n", string);
	268
	269	/* show the protocol and transport */
	270	SPRINTF(" Protocol: %s\n", us->protocol_name);
	271	SPRINTF(" Transport: %s\n", us->transport_name);
	272
	273	/* show the device flags */
60e8b807	274	SPRINTF(" Quirks:");
126bb03b AC	275
126bb03b AC	276	#define US_FLAG(name, value) \
a2c49a9a WB	277	do { \
a2c49a9a WB	278	if (us->fflags & value) \
60e8b807	279	SPRINTF(" " #name); \
a2c49a9a	280	} while (0);
126bb03b AC	281	US_DO_ALL_FLAGS
126bb03b AC	282	#undef US_FLAG
60e8b807 AV	283	seq_putc(m, '\n');
60e8b807 AV	284	return 0;
126bb03b AC	285	}
	286
	287	/***********************************************************************
	288	* Sysfs interface
	289	***********************************************************************/
	290
	291	/* Output routine for the sysfs max_sectors file */
00009615	292	static ssize_t max_sectors_show(struct device *dev,
8a25a2cf	293	struct device_attribute attr, char buf)
126bb03b AC	294	{
	295	struct scsi_device *sdev = to_scsi_device(dev);
	296
beddfe84	297	/* pr_info("scsiglue --- ssize_t show_max_sectors\n"); */
126bb03b AC	298	return sprintf(buf, "%u\n", queue_max_sectors(sdev->request_queue));
	299	}
	300
	301	/* Input routine for the sysfs max_sectors file */
00009615	302	static ssize_t max_sectors_store(struct device *dev,
8a25a2cf CYC	303	struct device_attribute *attr,
8a25a2cf CYC	304	const char *buf, size_t count)
126bb03b AC	305	{
	306	struct scsi_device *sdev = to_scsi_device(dev);
	307	unsigned short ms;
	308
beddfe84	309	/* pr_info("scsiglue --- ssize_t store_max_sectors\n"); */
8a25a2cf	310	if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) {
126bb03b AC	311	blk_queue_max_hw_sectors(sdev->request_queue, ms);
	312	return strlen(buf);
	313	}
8a25a2cf	314	return -EINVAL;
126bb03b	315	}
00009615	316	static DEVICE_ATTR_RW(max_sectors);
126bb03b	317
0ea8a165 JS	318	static struct device_attribute *sysfs_device_attr_list[] = {
	319	&dev_attr_max_sectors, NULL,
	320	};
126bb03b AC	321
	322	/* this defines our host template, with which we'll allocate hosts */
	323
8a25a2cf CYC	324	/*
	325	* usb_stor_host_template()
	326	*/
126bb03b AC	327	struct scsi_host_template usb_stor_host_template = {
	328	/* basic userland interface stuff */
	329	.name = "eucr-storage",
	330	.proc_name = "eucr-storage",
60e8b807 AV	331	.write_info = write_info,
60e8b807 AV	332	.show_info = show_info,
126bb03b AC	333	.info = host_info,
	334
	335	/* command interface -- queued only */
	336	.queuecommand = queuecommand,
	337
	338	/* error and abort handlers */
	339	.eh_abort_handler = command_abort,
	340	.eh_device_reset_handler = device_reset,
	341	.eh_bus_reset_handler = bus_reset,
	342
	343	/* queue commands only, only one command per LUN */
	344	.can_queue = 1,
	345	.cmd_per_lun = 1,
	346
	347	/* unknown initiator id */
	348	.this_id = -1,
	349
	350	.slave_alloc = slave_alloc,
	351	.slave_configure = slave_configure,
	352
	353	/* lots of sg segments can be handled */
	354	.sg_tablesize = SG_ALL,
	355
	356	/* limit the total size of a transfer to 120 KB */
	357	.max_sectors = 240,
	358
	359	/* merge commands... this seems to help performance, but
	360	* periodically someone should test to see which setting is more
	361	* optimal.
	362	*/
	363	.use_clustering = 1,
	364
	365	/* emulated HBA */
	366	.emulated = 1,
	367
	368	/* we do our own delay after a device or bus reset */
	369	.skip_settle_delay = 1,
	370
	371	/* sysfs device attributes */
	372	.sdev_attrs = sysfs_device_attr_list,
	373
	374	/* module management */
	375	.module = THIS_MODULE
	376	};
	377
	378	/* To Report "Illegal Request: Invalid Field in CDB */
	379	unsigned char usb_stor_sense_invalidCDB[18] = {
	380	[0] = 0x70, /* current error */
	381	[2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
	382	[7] = 0x0a, /* additional length */
	383	[12] = 0x24 /* Invalid Field in CDB */
	384	};
	385
	386	/***********************************************************************
	387	* Scatter-gather transfer buffer access routines
	388	***********************************************************************/
	389
8a25a2cf CYC	390	/*
	391	* usb_stor_access_xfer_buf()
	392	*/
b9594b81 AG	393	unsigned int usb_stor_access_xfer_buf(struct us_data *us,
	394	unsigned char *buffer, unsigned int buflen,
	395	struct scsi_cmnd srb, struct scatterlist *sgptr,
126bb03b AC	396	unsigned int *offset, enum xfer_buf_dir dir)
	397	{
	398	unsigned int cnt;
	399
beddfe84	400	/* pr_info("transport --- usb_stor_access_xfer_buf\n"); */
126bb03b AC	401	struct scatterlist sg = sgptr;
	402
	403	if (!sg)
	404	sg = scsi_sglist(srb);
	405
	406	cnt = 0;
8a25a2cf CYC	407	while (cnt < buflen && sg) {
	408	struct page *page = sg_page(sg) +
	409	((sg->offset + *offset) >> PAGE_SHIFT);
126bb03b AC	410	unsigned int poff = (sg->offset + *offset) & (PAGE_SIZE-1);
	411	unsigned int sglen = sg->length - *offset;
	412
8a25a2cf	413	if (sglen > buflen - cnt) {
126bb03b AC	414	/* Transfer ends within this s-g entry */
	415	sglen = buflen - cnt;
	416	*offset += sglen;
8a25a2cf	417	} else {
126bb03b AC	418	/* Transfer continues to next s-g entry */
	419	*offset = 0;
	420	sg = sg_next(sg);
	421	}
	422
8a25a2cf CYC	423	while (sglen > 0) {
8a25a2cf CYC	424	unsigned int plen = min(sglen,
b9594b81	425	(unsigned int)PAGE_SIZE - poff);
126bb03b AC	426	unsigned char *ptr = kmap(page);
	427
	428	if (dir == TO_XFER_BUF)
	429	memcpy(ptr + poff, buffer + cnt, plen);
	430	else
	431	memcpy(buffer + cnt, ptr + poff, plen);
	432	kunmap(page);
	433
	434	/* Start at the beginning of the next page */
	435	poff = 0;
	436	++page;
	437	cnt += plen;
	438	sglen -= plen;
	439	}
	440	}
	441	*sgptr = sg;
	442
	443	/* Return the amount actually transferred */
	444	return cnt;
	445	}
	446
8a25a2cf CYC	447	/*
	448	* Store the contents of buffer into srb's transfer
	449	* buffer and set the SCSI residue.
	450	*/
	451	/*
	452	* usb_stor_set_xfer_buf()
	453	*/
	454	void usb_stor_set_xfer_buf(struct us_data us, unsigned char buffer,
	455	unsigned int buflen, struct scsi_cmnd *srb, unsigned int dir)
126bb03b AC	456	{
	457	unsigned int offset = 0;
	458	struct scatterlist *sg = NULL;
	459
beddfe84	460	/* pr_info("transport --- usb_stor_set_xfer_buf\n"); */
8a25a2cf	461	/* TO_XFER_BUF = 0, FROM_XFER_BUF = 1 */
126bb03b	462	buflen = min(buflen, scsi_bufflen(srb));
8a25a2cf CYC	463	buflen = usb_stor_access_xfer_buf(us, buffer, buflen, srb,
8a25a2cf CYC	464	&sg, &offset, dir);
126bb03b AC	465	if (buflen < scsi_bufflen(srb))
	466	scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
	467	}