* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-
/*
* The Mass Storage Function acts as a USB Mass Storage device,
* appearing to the host as a disk drive or as a CD-ROM drive. In
* <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
*/
-
/*
* Driver Design
*
/* #define VERBOSE_DEBUG */
/* #define DUMP_MSGS */
-
#include <linux/blkdev.h>
#include <linux/completion.h>
#include <linux/dcache.h>
#include "gadget_chips.h"
-
/*------------------------------------------------------------------------*/
#define FSG_DRIVER_DESC "Mass Storage Function"
static const char fsg_string_interface[] = "Mass Storage";
-
#define FSG_NO_INTR_EP 1
#define FSG_NO_DEVICE_STRINGS 1
#define FSG_NO_OTG 1
/* FSF callback functions */
struct fsg_operations {
- /* Callback function to call when thread exits. If no
+ /*
+ * 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). */
+ * set).
+ */
int (*thread_exits)(struct fsg_common *common);
- /* Called prior to ejection. Negative return means error,
+ /*
+ * Called prior to ejection. Negative return means error,
* zero means to continue with ejection, positive means not to
- * eject. */
+ * eject.
+ */
int (*pre_eject)(struct fsg_common *common,
struct fsg_lun *lun, int num);
- /* Called after ejection. Negative return means error, zero
- * or positive is just a success. */
+ /*
+ * Called after ejection. Negative return means error, zero
+ * or positive is just a success.
+ */
int (*post_eject)(struct fsg_common *common,
struct fsg_lun *lun, int num);
};
-
/* Data shared by all the FSG instances. */
struct fsg_common {
struct usb_gadget *gadget;
/* Gadget's private data. */
void *private_data;
- /* Vendor (8 chars), product (16 chars), release (4
- * hexadecimal digits) and NUL byte */
+ /*
+ * Vendor (8 chars), product (16 chars), release (4
+ * hexadecimal digits) and NUL byte
+ */
char inquiry_string[8 + 16 + 4 + 1];
struct kref ref;
};
-
struct fsg_config {
unsigned nluns;
struct fsg_lun_config {
char can_stall;
};
-
struct fsg_dev {
struct usb_function function;
struct usb_gadget *gadget; /* Copy of cdev->gadget */
struct usb_ep *bulk_out;
};
-
static inline int __fsg_is_set(struct fsg_common *common,
const char *func, unsigned line)
{
#define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__))
-
static inline struct fsg_dev *fsg_from_func(struct usb_function *f)
{
return container_of(f, struct fsg_dev, function);
}
-
typedef void (*fsg_routine_t)(struct fsg_dev *);
static int exception_in_progress(struct fsg_common *common)
/* Make bulk-out requests be divisible by the maxpacket size */
static void set_bulk_out_req_length(struct fsg_common *common,
- struct fsg_buffhd *bh, unsigned int length)
+ struct fsg_buffhd *bh, unsigned int length)
{
unsigned int rem;
bh->outreq->length = length;
}
+
/*-------------------------------------------------------------------------*/
static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
wake_up_process(common->thread_task);
}
-
static void raise_exception(struct fsg_common *common, enum fsg_state new_state)
{
unsigned long flags;
- /* Do nothing if a higher-priority exception is already in progress.
+ /*
+ * Do nothing if a higher-priority exception is already in progress.
* If a lower-or-equal priority exception is in progress, preempt it
- * and notify the main thread by sending it a signal. */
+ * and notify the main thread by sending it a signal.
+ */
spin_lock_irqsave(&common->lock, flags);
if (common->state <= new_state) {
common->exception_req_tag = common->ep0_req_tag;
return rc;
}
+
/*-------------------------------------------------------------------------*/
-/* Bulk and interrupt endpoint completion handlers.
- * These always run in_irq. */
+/* Completion handlers. These always run in_irq. */
static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length)
DBG(common, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual, req->length);
+ req->status, req->actual, req->length);
if (req->status == -ECONNRESET) /* Request was cancelled */
usb_ep_fifo_flush(ep);
dump_msg(common, "bulk-out", req->buf, req->actual);
if (req->status || req->actual != bh->bulk_out_intended_length)
DBG(common, "%s --> %d, %u/%u\n", __func__,
- req->status, req->actual,
- bh->bulk_out_intended_length);
+ req->status, req->actual, bh->bulk_out_intended_length);
if (req->status == -ECONNRESET) /* Request was cancelled */
usb_ep_fifo_flush(ep);
spin_unlock(&common->lock);
}
-
-/*-------------------------------------------------------------------------*/
-
-/* Ep0 class-specific handlers. These always run in_irq. */
-
static int fsg_setup(struct usb_function *f,
- const struct usb_ctrlrequest *ctrl)
+ const struct usb_ctrlrequest *ctrl)
{
struct fsg_dev *fsg = fsg_from_func(f);
struct usb_request *req = fsg->common->ep0req;
if (w_index != fsg->interface_number || w_value != 0)
return -EDOM;
- /* Raise an exception to stop the current operation
- * and reinitialize our state. */
+ /*
+ * Raise an exception to stop the current operation
+ * and reinitialize our state.
+ */
DBG(fsg, "bulk reset request\n");
raise_exception(fsg->common, FSG_STATE_RESET);
return DELAYED_STATUS;
if (w_index != fsg->interface_number || w_value != 0)
return -EDOM;
VDBG(fsg, "get max LUN\n");
- *(u8 *) req->buf = fsg->common->nluns - 1;
+ *(u8 *)req->buf = fsg->common->nluns - 1;
/* Respond with data/status */
req->length = min((u16)1, w_length);
}
VDBG(fsg,
- "unknown class-specific control req "
- "%02x.%02x v%04x i%04x l%u\n",
+ "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n",
ctrl->bRequestType, ctrl->bRequest,
le16_to_cpu(ctrl->wValue), w_index, w_length);
return -EOPNOTSUPP;
/* All the following routines run in process context */
-
/* Use this for bulk or interrupt transfers, not ep0 */
static void start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
- struct usb_request *req, int *pbusy,
- enum fsg_buffer_state *state)
+ struct usb_request *req, int *pbusy,
+ enum fsg_buffer_state *state)
{
int rc;
/* We can't do much more than wait for a reset */
- /* Note: currently the net2280 driver fails zero-length
- * submissions if DMA is enabled. */
- if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP &&
- req->length == 0))
+ /*
+ * Note: currently the net2280 driver fails zero-length
+ * submissions if DMA is enabled.
+ */
+ if (rc != -ESHUTDOWN &&
+ !(rc == -EOPNOTSUPP && req->length == 0))
WARNING(fsg, "error in submission: %s --> %d\n",
- ep->name, rc);
+ ep->name, rc);
}
}
unsigned int partial_page;
ssize_t nread;
- /* Get the starting Logical Block Address and check that it's
- * not too big */
+ /*
+ * Get the starting Logical Block Address and check that it's
+ * not too big.
+ */
if (common->cmnd[0] == READ_6)
lba = get_unaligned_be24(&common->cmnd[1]);
else {
lba = get_unaligned_be32(&common->cmnd[2]);
- /* We allow DPO (Disable Page Out = don't save data in the
+ /*
+ * We allow DPO (Disable Page Out = don't save data in the
* cache) and FUA (Force Unit Access = don't read from the
- * cache), but we don't implement them. */
+ * cache), but we don't implement them.
+ */
if ((common->cmnd[1] & ~0x18) != 0) {
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return -EINVAL;
return -EIO; /* No default reply */
for (;;) {
-
- /* Figure out how much we need to read:
+ /*
+ * Figure out how much we need to read:
* Try to read the remaining amount.
* But don't read more than the buffer size.
* And don't try to read past the end of the file.
* Finally, if we're not at a page boundary, don't read past
* the next page.
* If this means reading 0 then we were asked to read past
- * the end of file. */
+ * the end of file.
+ */
amount = min(amount_left, FSG_BUFLEN);
- amount = min((loff_t) amount,
- curlun->file_length - file_offset);
+ amount = min((loff_t)amount,
+ curlun->file_length - file_offset);
partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
if (partial_page > 0)
- amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
- partial_page);
+ amount = min(amount, (unsigned int)PAGE_CACHE_SIZE -
+ partial_page);
/* Wait for the next buffer to become available */
bh = common->next_buffhd_to_fill;
return rc;
}
- /* If we were asked to read past the end of file,
- * end with an empty buffer. */
+ /*
+ * If we were asked to read past the end of file,
+ * end with an empty buffer.
+ */
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
/* Perform the read */
file_offset_tmp = file_offset;
nread = vfs_read(curlun->filp,
- (char __user *) bh->buf,
- amount, &file_offset_tmp);
+ (char __user *)bh->buf,
+ amount, &file_offset_tmp);
VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
- (unsigned long long) file_offset,
- (int) nread);
+ (unsigned long long)file_offset, (int)nread);
if (signal_pending(current))
return -EINTR;
if (nread < 0) {
- LDBG(curlun, "error in file read: %d\n",
- (int) nread);
+ LDBG(curlun, "error in file read: %d\n", (int)nread);
nread = 0;
} else if (nread < amount) {
LDBG(curlun, "partial file read: %d/%u\n",
- (int) nread, amount);
+ (int)nread, amount);
nread -= (nread & 511); /* Round down to a block */
}
file_offset += nread;
curlun->filp->f_flags &= ~O_SYNC; /* Default is not to wait */
spin_unlock(&curlun->filp->f_lock);
- /* Get the starting Logical Block Address and check that it's
- * not too big */
+ /*
+ * Get the starting Logical Block Address and check that it's
+ * not too big
+ */
if (common->cmnd[0] == WRITE_6)
lba = get_unaligned_be24(&common->cmnd[1]);
else {
lba = get_unaligned_be32(&common->cmnd[2]);
- /* We allow DPO (Disable Page Out = don't save data in the
+ /*
+ * We allow DPO (Disable Page Out = don't save data in the
* cache) and FUA (Force Unit Access = write directly to the
* medium). We don't implement DPO; we implement FUA by
- * performing synchronous output. */
+ * performing synchronous output.
+ */
if (common->cmnd[1] & ~0x18) {
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return -EINVAL;
bh = common->next_buffhd_to_fill;
if (bh->state == BUF_STATE_EMPTY && get_some_more) {
- /* Figure out how much we want to get:
+ /*
+ * Figure out how much we want to get:
* Try to get the remaining amount.
* But don't get more than the buffer size.
* And don't try to go past the end of the file.
* don't go past the next page.
* If this means getting 0, then we were asked
* to write past the end of file.
- * Finally, round down to a block boundary. */
+ * Finally, round down to a block boundary.
+ */
amount = min(amount_left_to_req, FSG_BUFLEN);
- amount = min((loff_t) amount, curlun->file_length -
- usb_offset);
+ amount = min((loff_t)amount,
+ curlun->file_length - usb_offset);
partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
if (partial_page > 0)
amount = min(amount,
- (unsigned int) PAGE_CACHE_SIZE - partial_page);
+ (unsigned int)PAGE_CACHE_SIZE - partial_page);
if (amount == 0) {
get_some_more = 0;
curlun->info_valid = 1;
continue;
}
- amount -= (amount & 511);
+ amount -= amount & 511;
if (amount == 0) {
- /* Why were we were asked to transfer a
- * partial block? */
+ /*
+ * Why were we were asked to transfer a
+ * partial block?
+ */
get_some_more = 0;
continue;
}
if (amount_left_to_req == 0)
get_some_more = 0;
- /* amount is always divisible by 512, hence by
- * the bulk-out maxpacket size */
+ /*
+ * amount is always divisible by 512, hence by
+ * the bulk-out maxpacket size
+ */
bh->outreq->length = amount;
bh->bulk_out_intended_length = amount;
bh->outreq->short_not_ok = 1;
if (!start_out_transfer(common, bh))
- /* Don't know what to do if
- * common->fsg is NULL */
+ /* Dunno what to do if common->fsg is NULL */
return -EIO;
common->next_buffhd_to_fill = bh->next;
continue;
amount = bh->outreq->actual;
if (curlun->file_length - file_offset < amount) {
LERROR(curlun,
- "write %u @ %llu beyond end %llu\n",
- amount, (unsigned long long) file_offset,
- (unsigned long long) curlun->file_length);
+ "write %u @ %llu beyond end %llu\n",
+ amount, (unsigned long long)file_offset,
+ (unsigned long long)curlun->file_length);
amount = curlun->file_length - file_offset;
}
/* Perform the write */
file_offset_tmp = file_offset;
nwritten = vfs_write(curlun->filp,
- (char __user *) bh->buf,
- amount, &file_offset_tmp);
+ (char __user *)bh->buf,
+ amount, &file_offset_tmp);
VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
- (unsigned long long) file_offset,
- (int) nwritten);
+ (unsigned long long)file_offset, (int)nwritten);
if (signal_pending(current))
return -EINTR; /* Interrupted! */
if (nwritten < 0) {
LDBG(curlun, "error in file write: %d\n",
- (int) nwritten);
+ (int)nwritten);
nwritten = 0;
} else if (nwritten < amount) {
LDBG(curlun, "partial file write: %d/%u\n",
- (int) nwritten, amount);
+ (int)nwritten, amount);
nwritten -= (nwritten & 511);
/* Round down to a block */
}
unsigned int amount;
ssize_t nread;
- /* Get the starting Logical Block Address and check that it's
- * not too big */
+ /*
+ * Get the starting Logical Block Address and check that it's
+ * not too big.
+ */
lba = get_unaligned_be32(&common->cmnd[2]);
if (lba >= curlun->num_sectors) {
curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
return -EINVAL;
}
- /* We allow DPO (Disable Page Out = don't save data in the
- * cache) but we don't implement it. */
+ /*
+ * We allow DPO (Disable Page Out = don't save data in the
+ * cache) but we don't implement it.
+ */
if (common->cmnd[1] & ~0x10) {
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return -EINVAL;
/* Just try to read the requested blocks */
while (amount_left > 0) {
-
- /* Figure out how much we need to read:
+ /*
+ * Figure out how much we need to read:
* Try to read the remaining amount, but not more than
* the buffer size.
* And don't try to read past the end of the file.
* If this means reading 0 then we were asked to read
- * past the end of file. */
+ * past the end of file.
+ */
amount = min(amount_left, FSG_BUFLEN);
- amount = min((loff_t) amount,
- curlun->file_length - file_offset);
+ amount = min((loff_t)amount,
+ curlun->file_length - file_offset);
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
return -EINTR;
if (nread < 0) {
- LDBG(curlun, "error in file verify: %d\n",
- (int) nread);
+ LDBG(curlun, "error in file verify: %d\n", (int)nread);
nread = 0;
} else if (nread < amount) {
LDBG(curlun, "partial file verify: %d/%u\n",
- (int) nread, amount);
- nread -= (nread & 511); /* Round down to a sector */
+ (int)nread, amount);
+ nread -= nread & 511; /* Round down to a sector */
}
if (nread == 0) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
return 36;
}
-
static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
return 18;
}
-
static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
u32 lba = get_unaligned_be32(&common->cmnd[2]);
int pmi = common->cmnd[8];
- u8 *buf = (u8 *) bh->buf;
+ u8 *buf = (u8 *)bh->buf;
/* Check the PMI and LBA fields */
if (pmi > 1 || (pmi == 0 && lba != 0)) {
return 8;
}
-
static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
int msf = common->cmnd[1] & 0x02;
u32 lba = get_unaligned_be32(&common->cmnd[2]);
- u8 *buf = (u8 *) bh->buf;
+ u8 *buf = (u8 *)bh->buf;
if (common->cmnd[1] & ~0x02) { /* Mask away MSF */
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return 8;
}
-
static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
int msf = common->cmnd[1] & 0x02;
int start_track = common->cmnd[6];
- u8 *buf = (u8 *) bh->buf;
+ u8 *buf = (u8 *)bh->buf;
if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */
start_track > 1) {
return 20;
}
-
static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
changeable_values = (pc == 1);
all_pages = (page_code == 0x3f);
- /* Write the mode parameter header. Fixed values are: default
+ /*
+ * Write the mode parameter header. Fixed values are: default
* medium type, no cache control (DPOFUA), and no block descriptors.
* The only variable value is the WriteProtect bit. We will fill in
- * the mode data length later. */
+ * the mode data length later.
+ */
memset(buf, 0, 8);
if (mscmnd == MODE_SENSE) {
buf[2] = (curlun->ro ? 0x80 : 0x00); /* WP, DPOFUA */
/* No block descriptors */
- /* The mode pages, in numerical order. The only page we support
- * is the Caching page. */
+ /*
+ * The mode pages, in numerical order. The only page we support
+ * is the Caching page.
+ */
if (page_code == 0x08 || all_pages) {
valid_page = 1;
buf[0] = 0x08; /* Page code */
buf += 12;
}
- /* Check that a valid page was requested and the mode data length
- * isn't too long. */
+ /*
+ * Check that a valid page was requested and the mode data length
+ * isn't too long.
+ */
len = buf - buf0;
if (!valid_page || len > limit) {
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return len;
}
-
static int do_start_stop(struct fsg_common *common)
{
struct fsg_lun *curlun = common->curlun;
loej = common->cmnd[4] & 0x02;
start = common->cmnd[4] & 0x01;
- /* Our emulation doesn't support mounting; the medium is
- * available for use as soon as it is loaded. */
+ /*
+ * Our emulation doesn't support mounting; the medium is
+ * available for use as soon as it is loaded.
+ */
if (start) {
if (!fsg_lun_is_open(curlun)) {
curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
: 0;
}
-
static int do_prevent_allow(struct fsg_common *common)
{
struct fsg_lun *curlun = common->curlun;
return 0;
}
-
static int do_read_format_capacities(struct fsg_common *common,
struct fsg_buffhd *bh)
{
return 12;
}
-
static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh)
{
struct fsg_lun *curlun = common->curlun;
bh->inreq->length = nsend;
bh->inreq->zero = 0;
start_transfer(fsg, fsg->bulk_in, bh->inreq,
- &bh->inreq_busy, &bh->state);
+ &bh->inreq_busy, &bh->state);
bh = fsg->common->next_buffhd_to_fill = bh->next;
fsg->common->usb_amount_left -= nsend;
nkeep = 0;
/* A short packet or an error ends everything */
if (bh->outreq->actual != bh->outreq->length ||
- bh->outreq->status != 0) {
+ bh->outreq->status != 0) {
raise_exception(common,
FSG_STATE_ABORT_BULK_OUT);
return -EINTR;
&& common->usb_amount_left > 0) {
amount = min(common->usb_amount_left, FSG_BUFLEN);
- /* amount is always divisible by 512, hence by
- * the bulk-out maxpacket size */
+ /*
+ * amount is always divisible by 512, hence by
+ * the bulk-out maxpacket size.
+ */
bh->outreq->length = amount;
bh->bulk_out_intended_length = amount;
bh->outreq->short_not_ok = 1;
if (!start_out_transfer(common, bh))
- /* Don't know what to do if
- * common->fsg is NULL */
+ /* Dunno what to do if common->fsg is NULL */
return -EIO;
common->next_buffhd_to_fill = bh->next;
common->usb_amount_left -= amount;
return 0;
}
-
static int finish_reply(struct fsg_common *common)
{
struct fsg_buffhd *bh = common->next_buffhd_to_fill;
case DATA_DIR_NONE:
break; /* Nothing to send */
- /* If we don't know whether the host wants to read or write,
+ /*
+ * If we don't know whether the host wants to read or write,
* this must be CB or CBI with an unknown command. We mustn't
* try to send or receive any data. So stall both bulk pipes
- * if we can and wait for a reset. */
+ * if we can and wait for a reset.
+ */
case DATA_DIR_UNKNOWN:
if (!common->can_stall) {
/* Nothing */
return -EIO;
common->next_buffhd_to_fill = bh->next;
- /* For Bulk-only, if we're allowed to stall then send the
+ /*
+ * For Bulk-only, if we're allowed to stall then send the
* short packet and halt the bulk-in endpoint. If we can't
- * stall, pad out the remaining data with 0's. */
+ * stall, pad out the remaining data with 0's.
+ */
} else if (common->can_stall) {
bh->inreq->zero = 1;
if (!start_in_transfer(common, bh))
}
break;
- /* We have processed all we want from the data the host has sent.
- * There may still be outstanding bulk-out requests. */
+ /*
+ * We have processed all we want from the data the host has sent.
+ * There may still be outstanding bulk-out requests.
+ */
case DATA_DIR_FROM_HOST:
if (common->residue == 0) {
/* Nothing to receive */
raise_exception(common, FSG_STATE_ABORT_BULK_OUT);
rc = -EINTR;
- /* We haven't processed all the incoming data. Even though
+ /*
+ * We haven't processed all the incoming data. Even though
* we may be allowed to stall, doing so would cause a race.
* The controller may already have ACK'ed all the remaining
* bulk-out packets, in which case the host wouldn't see a
* STALL. Not realizing the endpoint was halted, it wouldn't
- * clear the halt -- leading to problems later on. */
+ * clear the halt -- leading to problems later on.
+ */
#if 0
} else if (common->can_stall) {
if (fsg_is_set(common))
rc = -EINTR;
#endif
- /* We can't stall. Read in the excess data and throw it
- * all away. */
+ /*
+ * We can't stall. Read in the excess data and throw it
+ * all away.
+ */
} else {
rc = throw_away_data(common);
}
return rc;
}
-
static int send_status(struct fsg_common *common)
{
struct fsg_lun *curlun = common->curlun;
/*-------------------------------------------------------------------------*/
-/* Check whether the command is properly formed and whether its data size
- * and direction agree with the values we already have. */
+/*
+ * Check whether the command is properly formed and whether its data size
+ * and direction agree with the values we already have.
+ */
static int check_command(struct fsg_common *common, int cmnd_size,
- enum data_direction data_dir, unsigned int mask,
- int needs_medium, const char *name)
+ enum data_direction data_dir, unsigned int mask,
+ int needs_medium, const char *name)
{
int i;
int lun = common->cmnd[1] >> 5;
hdlen[0] = 0;
if (common->data_dir != DATA_DIR_UNKNOWN)
sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir],
- common->data_size);
+ common->data_size);
VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
name, cmnd_size, dirletter[(int) data_dir],
common->data_size_from_cmnd, common->cmnd_size, hdlen);
- /* We can't reply at all until we know the correct data direction
- * and size. */
+ /*
+ * We can't reply at all until we know the correct data direction
+ * and size.
+ */
if (common->data_size_from_cmnd == 0)
data_dir = DATA_DIR_NONE;
if (common->data_size < common->data_size_from_cmnd) {
- /* Host data size < Device data size is a phase error.
+ /*
+ * Host data size < Device data size is a phase error.
* Carry out the command, but only transfer as much as
- * we are allowed. */
+ * we are allowed.
+ */
common->data_size_from_cmnd = common->data_size;
common->phase_error = 1;
}
common->usb_amount_left = common->data_size;
/* Conflicting data directions is a phase error */
- if (common->data_dir != data_dir
- && common->data_size_from_cmnd > 0) {
+ if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) {
common->phase_error = 1;
return -EINVAL;
}
/* Verify the length of the command itself */
if (cmnd_size != common->cmnd_size) {
- /* Special case workaround: There are plenty of buggy SCSI
+ /*
+ * Special case workaround: There are plenty of buggy SCSI
* implementations. Many have issues with cbw->Length
* field passing a wrong command size. For those cases we
* always try to work around the problem by using the length
curlun = NULL;
common->bad_lun_okay = 0;
- /* INQUIRY and REQUEST SENSE commands are explicitly allowed
- * to use unsupported LUNs; all others may not. */
+ /*
+ * INQUIRY and REQUEST SENSE commands are explicitly allowed
+ * to use unsupported LUNs; all others may not.
+ */
if (common->cmnd[0] != INQUIRY &&
common->cmnd[0] != REQUEST_SENSE) {
DBG(common, "unsupported LUN %d\n", common->lun);
}
}
- /* If a unit attention condition exists, only INQUIRY and
- * REQUEST SENSE commands are allowed; anything else must fail. */
+ /*
+ * If a unit attention condition exists, only INQUIRY and
+ * REQUEST SENSE commands are allowed; anything else must fail.
+ */
if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
- common->cmnd[0] != INQUIRY &&
- common->cmnd[0] != REQUEST_SENSE) {
+ common->cmnd[0] != INQUIRY &&
+ common->cmnd[0] != REQUEST_SENSE) {
curlun->sense_data = curlun->unit_attention_data;
curlun->unit_attention_data = SS_NO_SENSE;
return -EINVAL;
return 0;
}
-
static int do_scsi_command(struct fsg_common *common)
{
struct fsg_buffhd *bh;
"TEST UNIT READY");
break;
- /* Although optional, this command is used by MS-Windows. We
- * support a minimal version: BytChk must be 0. */
+ /*
+ * Although optional, this command is used by MS-Windows. We
+ * support a minimal version: BytChk must be 0.
+ */
case VERIFY:
common->data_size_from_cmnd = 0;
reply = check_command(common, 10, DATA_DIR_NONE,
reply = do_write(common);
break;
- /* Some mandatory commands that we recognize but don't implement.
+ /*
+ * Some mandatory commands that we recognize but don't implement.
* They don't mean much in this setting. It's left as an exercise
* for anyone interested to implement RESERVE and RELEASE in terms
- * of Posix locks. */
+ * of Posix locks.
+ */
case FORMAT_UNIT:
case RELEASE:
case RESERVE:
if (reply == -EINVAL)
reply = 0; /* Error reply length */
if (reply >= 0 && common->data_dir == DATA_DIR_TO_HOST) {
- reply = min((u32) reply, common->data_size_from_cmnd);
+ reply = min((u32)reply, common->data_size_from_cmnd);
bh->inreq->length = reply;
bh->state = BUF_STATE_FULL;
common->residue -= reply;
req->actual,
le32_to_cpu(cbw->Signature));
- /* The Bulk-only spec says we MUST stall the IN endpoint
+ /*
+ * The Bulk-only spec says we MUST stall the IN endpoint
* (6.6.1), so it's unavoidable. It also says we must
* retain this state until the next reset, but there's
* no way to tell the controller driver it should ignore
*
* We aren't required to halt the OUT endpoint; instead
* we can simply accept and discard any data received
- * until the next reset. */
+ * until the next reset.
+ */
wedge_bulk_in_endpoint(fsg);
set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
return -EINVAL;
"cmdlen %u\n",
cbw->Lun, cbw->Flags, cbw->Length);
- /* We can do anything we want here, so let's stall the
- * bulk pipes if we are allowed to. */
+ /*
+ * We can do anything we want here, so let's stall the
+ * bulk pipes if we are allowed to.
+ */
if (common->can_stall) {
fsg_set_halt(fsg, fsg->bulk_out);
halt_bulk_in_endpoint(fsg);
return 0;
}
-
static int get_next_command(struct fsg_common *common)
{
struct fsg_buffhd *bh;
/* Don't know what to do if common->fsg is NULL */
return -EIO;
- /* We will drain the buffer in software, which means we
+ /*
+ * We will drain the buffer in software, which means we
* can reuse it for the next filling. No need to advance
- * next_buffhd_to_fill. */
+ * next_buffhd_to_fill.
+ */
/* Wait for the CBW to arrive */
while (bh->state != BUF_STATE_FULL) {
/****************************** ALT CONFIGS ******************************/
-
static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_lun *curlun;
unsigned int exception_req_tag;
- /* Clear the existing signals. Anything but SIGUSR1 is converted
- * into a high-priority EXIT exception. */
+ /*
+ * Clear the existing signals. Anything but SIGUSR1 is converted
+ * into a high-priority EXIT exception.
+ */
for (;;) {
int sig =
dequeue_signal_lock(current, ¤t->blocked, &info);
usb_ep_fifo_flush(common->fsg->bulk_out);
}
- /* Reset the I/O buffer states and pointers, the SCSI
- * state, and the exception. Then invoke the handler. */
+ /*
+ * Reset the I/O buffer states and pointers, the SCSI
+ * state, and the exception. Then invoke the handler.
+ */
spin_lock_irq(&common->lock);
for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
break;
case FSG_STATE_RESET:
- /* In case we were forced against our will to halt a
+ /*
+ * In case we were forced against our will to halt a
* bulk endpoint, clear the halt now. (The SuperH UDC
- * requires this.) */
+ * requires this.)
+ */
if (!fsg_is_set(common))
break;
if (test_and_clear_bit(IGNORE_BULK_OUT,
if (common->ep0_req_tag == exception_req_tag)
ep0_queue(common); /* Complete the status stage */
- /* Technically this should go here, but it would only be
+ /*
+ * Technically this should go here, but it would only be
* a waste of time. Ditto for the INTERFACE_CHANGE and
- * CONFIG_CHANGE cases. */
+ * CONFIG_CHANGE cases.
+ */
/* for (i = 0; i < common->nluns; ++i) */
/* common->luns[i].unit_attention_data = */
/* SS_RESET_OCCURRED; */
{
struct fsg_common *common = common_;
- /* Allow the thread to be killed by a signal, but set the signal mask
- * to block everything but INT, TERM, KILL, and USR1. */
+ /*
+ * Allow the thread to be killed by a signal, but set the signal mask
+ * to block everything but INT, TERM, KILL, and USR1.
+ */
allow_signal(SIGINT);
allow_signal(SIGTERM);
allow_signal(SIGKILL);
/* Allow the thread to be frozen */
set_freezable();
- /* Arrange for userspace references to be interpreted as kernel
+ /*
+ * Arrange for userspace references to be interpreted as kernel
* pointers. That way we can pass a kernel pointer to a routine
- * that expects a __user pointer and it will work okay. */
+ * that expects a __user pointer and it will work okay.
+ */
set_fs(get_ds());
/* The main loop */
kref_put(&common->ref, fsg_common_release);
}
-
static struct fsg_common *fsg_common_init(struct fsg_common *common,
struct usb_composite_dev *cdev,
struct fsg_config *cfg)
fsg_intf_desc.iInterface = rc;
}
- /* Create the LUNs, open their backing files, and register the
- * LUN devices in sysfs. */
+ /*
+ * Create the LUNs, open their backing files, and register the
+ * LUN devices in sysfs.
+ */
curlun = kzalloc(nluns * sizeof *curlun, GFP_KERNEL);
if (unlikely(!curlun)) {
rc = -ENOMEM;
}
common->nluns = nluns;
-
/* Data buffers cyclic list */
bh = common->buffhds;
i = FSG_NUM_BUFFERS;
} while (--i);
bh->next = common->buffhds;
-
/* Prepare inquiryString */
if (cfg->release != 0xffff) {
i = cfg->release;
: "File-CD Gadget"),
i);
-
- /* Some peripheral controllers are known not to be able to
+ /*
+ * Some peripheral controllers are known not to be able to
* halt bulk endpoints correctly. If one of them is present,
* disable stalls.
*/
common->can_stall = cfg->can_stall &&
!(gadget_is_at91(common->gadget));
-
spin_lock_init(&common->lock);
kref_init(&common->ref);
-
/* Tell the thread to start working */
common->thread_task =
kthread_create(fsg_main_thread, common,
init_completion(&common->thread_notifier);
init_waitqueue_head(&common->fsg_wait);
-
/* Information */
INFO(common, FSG_DRIVER_DESC ", version: " FSG_DRIVER_VERSION "\n");
INFO(common, "Number of LUNs=%d\n", common->nluns);
return common;
-
error_luns:
common->nluns = i + 1;
error_release:
common->state = FSG_STATE_TERMINATED; /* The thread is dead */
- /* Call fsg_common_release() directly, ref might be not
- * initialised */
+ /* Call fsg_common_release() directly, ref might be not initialised. */
fsg_common_release(&common->ref);
return ERR_PTR(rc);
}
-
static void fsg_common_release(struct kref *ref)
{
struct fsg_common *common = container_of(ref, struct fsg_common, ref);
/*-------------------------------------------------------------------------*/
-
static void fsg_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
kfree(fsg);
}
-
static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
{
struct fsg_dev *fsg = fsg_from_func(f);
fsg->function.disable = fsg_disable;
fsg->common = common;
- /* Our caller holds a reference to common structure so we
+ /*
+ * Our caller holds a reference to common structure so we
* don't have to be worry about it being freed until we return
* from this function. So instead of incrementing counter now
* and decrement in error recovery we increment it only when
- * call to usb_add_function() was successful. */
+ * call to usb_add_function() was successful.
+ */
rc = usb_add_function(c, &fsg->function);
if (unlikely(rc))
}
static inline int __deprecated __maybe_unused
-fsg_add(struct usb_composite_dev *cdev,
- struct usb_configuration *c,
+fsg_add(struct usb_composite_dev *cdev, struct usb_configuration *c,
struct fsg_common *common)
{
return fsg_bind_config(cdev, c, common);
/************************* Module parameters *************************/
-
struct fsg_module_parameters {
char *file[FSG_MAX_LUNS];
int ro[FSG_MAX_LUNS];
int 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, \
_FSG_MODULE_PARAM(prefix, params, stall, bool, \
"false to prevent bulk stalls")
-
static void
fsg_config_from_params(struct fsg_config *cfg,
const struct fsg_module_parameters *params)
projects / cascardo / linux.git / commitdiff